/* GStreamer * Copyright (C) 2008 Nokia Corporation. All rights reserved. * Contact: Stefan Kost * Copyright (C) 2008 Sebastian Dröge . * Copyright (C) 2011, Hewlett-Packard Development Company, L.P. * Author: Sebastian Dröge , Collabora Ltd. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:gstbaseparse * @short_description: Base class for stream parsers * @see_also: #GstBaseTransform * * This base class is for parser elements that process data and splits it * into separate audio/video/whatever frames. * * It provides for: * * provides one sink pad and one source pad * handles state changes * can operate in pull mode or push mode * handles seeking in both modes * handles events (NEWSEGMENT/EOS/FLUSH) * * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT) * * handles flushing * * * The purpose of this base class is to provide the basic functionality of * a parser and share a lot of rather complex code. * * Description of the parsing mechanism: * * * Set-up phase * * GstBaseParse calls @start to inform subclass that data processing is * about to start now. * * * GstBaseParse class calls @set_sink_caps to inform the subclass about * incoming sinkpad caps. Subclass could already set the srcpad caps * accordingly, but this might be delayed until calling * gst_base_parse_finish_frame() with a non-queued frame. * * * At least at this point subclass needs to tell the GstBaseParse class * how big data chunks it wants to receive (min_frame_size). It can do * this with gst_base_parse_set_min_frame_size(). * * * GstBaseParse class sets up appropriate data passing mode (pull/push) * and starts to process the data. * * * * * * Parsing phase * * GstBaseParse gathers at least min_frame_size bytes of data either * by pulling it from upstream or collecting buffers in an internal * #GstAdapter. * * * A buffer of (at least) min_frame_size bytes is passed to subclass with * @handle_frame. Subclass checks the contents and can optionally * return GST_FLOW_OK along with an amount of data to be skipped to find * a valid frame (which will result in a subsequent DISCONT). * If, otherwise, the buffer does not hold a complete frame, * @handle_frame can merely return and will be called again when additional * data is available. In push mode this amounts to an * additional input buffer (thus minimal additional latency), in pull mode * this amounts to some arbitrary reasonable buffer size increase. * Of course, gst_base_parse_set_min_size() could also be used if a very * specific known amount of additional data is required. * If, however, the buffer holds a complete valid frame, it can pass * the size of this frame to gst_base_parse_finish_frame(). * If acting as a converter, it can also merely indicate consumed input data * while simultaneously providing custom output data. * Note that baseclass performs some processing (such as tracking * overall consumed data rate versus duration) for each finished frame, * but other state is only updated upon each call to @handle_frame * (such as tracking upstream input timestamp). * * Subclass is also responsible for setting the buffer metadata * (e.g. buffer timestamp and duration, or keyframe if applicable). * (although the latter can also be done by GstBaseParse if it is * appropriately configured, see below). Frame is provided with * timestamp derived from upstream (as much as generally possible), * duration obtained from configuration (see below), and offset * if meaningful (in pull mode). * * Note that @check_valid_frame might receive any small * amount of input data when leftover data is being drained (e.g. at EOS). * * * As part of finish frame processing, * just prior to actually pushing the buffer in question, * it is passed to @pre_push_frame which gives subclass yet one * last chance to examine buffer metadata, or to send some custom (tag) * events, or to perform custom (segment) filtering. * * * During the parsing process GstBaseParseClass will handle both srcpad * and sinkpad events. They will be passed to subclass if @event or * @src_event callbacks have been provided. * * * * * Shutdown phase * * GstBaseParse class calls @stop to inform the subclass that data * parsing will be stopped. * * * * * * Subclass is responsible for providing pad template caps for * source and sink pads. The pads need to be named "sink" and "src". It also * needs to set the fixed caps on srcpad, when the format is ensured (e.g. * when base class calls subclass' @set_sink_caps function). * * This base class uses #GST_FORMAT_DEFAULT as a meaning of frames. So, * subclass conversion routine needs to know that conversion from * #GST_FORMAT_TIME to #GST_FORMAT_DEFAULT must return the * frame number that can be found from the given byte position. * * GstBaseParse uses subclasses conversion methods also for seeking (or * otherwise uses its own default one, see also below). * * Subclass @start and @stop functions will be called to inform the beginning * and end of data processing. * * Things that subclass need to take care of: * * Provide pad templates * * Fixate the source pad caps when appropriate * * * Inform base class how big data chunks should be retrieved. This is * done with gst_base_parse_set_min_frame_size() function. * * * Examine data chunks passed to subclass with @handle_frame and pass * proper frame(s) to gst_base_parse_finish_frame(), and setting src pad * caps and timestamps on frame. * * Provide conversion functions * * Update the duration information with gst_base_parse_set_duration() * * * Optionally passthrough using gst_base_parse_set_passthrough() * * * Configure various baseparse parameters using * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable() * and gst_base_parse_set_frame_rate(). * * * In particular, if subclass is unable to determine a duration, but * parsing (or specs) yields a frames per seconds rate, then this can be * provided to GstBaseParse to enable it to cater for * buffer time metadata (which will be taken from upstream as much as * possible). Internally keeping track of frame durations and respective * sizes that have been pushed provides GstBaseParse with an estimated * bitrate. A default @convert (used if not overriden) will then use these * rates to perform obvious conversions. These rates are also used to * update (estimated) duration at regular frame intervals. * * * */ /* TODO: * - In push mode provide a queue of adapter-"queued" buffers for upstream * buffer metadata * - Queue buffers/events until caps are set */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include "gstbaseparse.h" /* FIXME: get rid of old GstIndex code */ #include "gstindex.h" #include "gstindex.c" #include "gstmemindex.c" #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0) #define MIN_FRAMES_TO_POST_BITRATE 10 #define TARGET_DIFFERENCE (20 * GST_SECOND) GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug); #define GST_CAT_DEFAULT gst_base_parse_debug /* Supported formats */ static const GstFormat fmtlist[] = { GST_FORMAT_DEFAULT, GST_FORMAT_BYTES, GST_FORMAT_TIME, GST_FORMAT_UNDEFINED }; #define GST_BASE_PARSE_GET_PRIVATE(obj) \ (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate)) struct _GstBaseParsePrivate { GstPadMode pad_mode; GstAdapter *adapter; gint64 duration; GstFormat duration_fmt; gint64 estimated_duration; gint64 estimated_drift; guint min_frame_size; gboolean passthrough; gboolean syncable; gboolean has_timing_info; guint fps_num, fps_den; gint update_interval; guint bitrate; guint lead_in, lead_out; GstClockTime lead_in_ts, lead_out_ts; GstClockTime min_latency, max_latency; gboolean discont; gboolean flushing; gboolean drain; gint64 offset; gint64 sync_offset; GstClockTime next_ts; GstClockTime prev_ts; GstClockTime frame_duration; gboolean seen_keyframe; gboolean is_video; gint flushed; guint64 framecount; guint64 bytecount; guint64 data_bytecount; guint64 acc_duration; GstClockTime first_frame_ts; gint64 first_frame_offset; gboolean post_min_bitrate; gboolean post_avg_bitrate; gboolean post_max_bitrate; guint min_bitrate; guint avg_bitrate; guint max_bitrate; guint posted_avg_bitrate; /* frames/buffers that are queued and ready to go on OK */ GQueue queued_frames; GstBuffer *cache; /* index entry storage, either ours or provided */ GstIndex *index; gint index_id; gboolean own_index; GMutex index_lock; /* seek table entries only maintained if upstream is BYTE seekable */ gboolean upstream_seekable; gboolean upstream_has_duration; gint64 upstream_size; /* minimum distance between two index entries */ GstClockTimeDiff idx_interval; /* ts and offset of last entry added */ GstClockTime index_last_ts; gint64 index_last_offset; gboolean index_last_valid; /* timestamps currently produced are accurate, e.g. started from 0 onwards */ gboolean exact_position; /* seek events are temporarily kept to match them with newsegments */ GSList *pending_seeks; /* reverse playback */ GSList *buffers_pending; GSList *buffers_head; GSList *buffers_queued; GSList *buffers_send; GstClockTime last_ts; gint64 last_offset; /* Pending serialized events */ GList *pending_events; /* Newsegment event to be sent after SEEK */ gboolean pending_segment; /* offset of last parsed frame/data */ gint64 prev_offset; /* force a new frame, regardless of offset */ gboolean new_frame; /* whether we are merely scanning for a frame */ gboolean scanning; /* ... and resulting frame, if any */ GstBaseParseFrame *scanned_frame; /* TRUE if we're still detecting the format, i.e. * if ::detect() is still called for future buffers */ gboolean detecting; GList *detect_buffers; guint detect_buffers_size; /* if TRUE, a STREAM_START event needs to be pushed */ gboolean push_stream_start; }; typedef struct _GstBaseParseSeek { GstSegment segment; gboolean accurate; gint64 offset; GstClockTime start_ts; } GstBaseParseSeek; #define GST_BASE_PARSE_INDEX_LOCK(parse) \ g_mutex_lock (&parse->priv->index_lock); #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \ g_mutex_unlock (&parse->priv->index_lock); static GstElementClass *parent_class = NULL; static void gst_base_parse_class_init (GstBaseParseClass * klass); static void gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * klass); GType gst_base_parse_get_type (void) { static volatile gsize base_parse_type = 0; if (g_once_init_enter (&base_parse_type)) { static const GTypeInfo base_parse_info = { sizeof (GstBaseParseClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) gst_base_parse_class_init, NULL, NULL, sizeof (GstBaseParse), 0, (GInstanceInitFunc) gst_base_parse_init, }; GType _type; _type = g_type_register_static (GST_TYPE_ELEMENT, "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT); g_once_init_leave (&base_parse_type, _type); } return (GType) base_parse_type; } static void gst_base_parse_finalize (GObject * object); static GstStateChangeReturn gst_base_parse_change_state (GstElement * element, GstStateChange transition); static void gst_base_parse_reset (GstBaseParse * parse); #if 0 static void gst_base_parse_set_index (GstElement * element, GstIndex * index); static GstIndex *gst_base_parse_get_index (GstElement * element); #endif static gboolean gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent); static gboolean gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent, GstPadMode mode, gboolean active); static gboolean gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event); static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event); static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event); static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query); static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event); static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query); static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer); static void gst_base_parse_loop (GstPad * pad); static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame); static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event); static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event); static void gst_base_parse_drain (GstBaseParse * parse); static void gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min, gboolean post_avg, gboolean post_max); static gint64 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time, gboolean before, GstClockTime * _ts); static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time, gint64 * _offset); static GstFlowReturn gst_base_parse_start_fragment (GstBaseParse * parse); static GstFlowReturn gst_base_parse_finish_fragment (GstBaseParse * parse, gboolean prev_head); static inline GstFlowReturn gst_base_parse_check_sync (GstBaseParse * parse); static gboolean gst_base_parse_is_seekable (GstBaseParse * parse); static void gst_base_parse_clear_queues (GstBaseParse * parse) { g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL); g_slist_free (parse->priv->buffers_queued); parse->priv->buffers_queued = NULL; g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref, NULL); g_slist_free (parse->priv->buffers_pending); parse->priv->buffers_pending = NULL; g_slist_foreach (parse->priv->buffers_head, (GFunc) gst_buffer_unref, NULL); g_slist_free (parse->priv->buffers_head); parse->priv->buffers_head = NULL; g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL); g_slist_free (parse->priv->buffers_send); parse->priv->buffers_send = NULL; g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL); g_list_free (parse->priv->detect_buffers); parse->priv->detect_buffers = NULL; parse->priv->detect_buffers_size = 0; g_queue_foreach (&parse->priv->queued_frames, (GFunc) gst_base_parse_frame_free, NULL); g_queue_clear (&parse->priv->queued_frames); gst_buffer_replace (&parse->priv->cache, NULL); g_list_foreach (parse->priv->pending_events, (GFunc) gst_event_unref, NULL); g_list_free (parse->priv->pending_events); parse->priv->pending_events = NULL; parse->priv->pending_segment = FALSE; } static void gst_base_parse_finalize (GObject * object) { GstBaseParse *parse = GST_BASE_PARSE (object); g_object_unref (parse->priv->adapter); if (parse->priv->cache) { gst_buffer_unref (parse->priv->cache); parse->priv->cache = NULL; } g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref, NULL); g_list_free (parse->priv->pending_events); parse->priv->pending_events = NULL; parse->priv->pending_segment = FALSE; if (parse->priv->index) { gst_object_unref (parse->priv->index); parse->priv->index = NULL; } g_mutex_clear (&parse->priv->index_lock); gst_base_parse_clear_queues (parse); G_OBJECT_CLASS (parent_class)->finalize (object); } static void gst_base_parse_class_init (GstBaseParseClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = G_OBJECT_CLASS (klass); g_type_class_add_private (klass, sizeof (GstBaseParsePrivate)); parent_class = g_type_class_peek_parent (klass); gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize); gstelement_class = (GstElementClass *) klass; gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_base_parse_change_state); #if 0 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index); gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index); #endif /* Default handlers */ klass->sink_event = gst_base_parse_sink_eventfunc; klass->src_event = gst_base_parse_src_eventfunc; klass->convert = gst_base_parse_convert_default; GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0, "baseparse element"); } static void gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass) { GstPadTemplate *pad_template; GST_DEBUG_OBJECT (parse, "gst_base_parse_init"); parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse); pad_template = gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink"); g_return_if_fail (pad_template != NULL); parse->sinkpad = gst_pad_new_from_template (pad_template, "sink"); gst_pad_set_event_function (parse->sinkpad, GST_DEBUG_FUNCPTR (gst_base_parse_sink_event)); gst_pad_set_query_function (parse->sinkpad, GST_DEBUG_FUNCPTR (gst_base_parse_sink_query)); gst_pad_set_chain_function (parse->sinkpad, GST_DEBUG_FUNCPTR (gst_base_parse_chain)); gst_pad_set_activate_function (parse->sinkpad, GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate)); gst_pad_set_activatemode_function (parse->sinkpad, GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode)); GST_PAD_SET_PROXY_ALLOCATION (parse->sinkpad); gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad); GST_DEBUG_OBJECT (parse, "sinkpad created"); pad_template = gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src"); g_return_if_fail (pad_template != NULL); parse->srcpad = gst_pad_new_from_template (pad_template, "src"); gst_pad_set_event_function (parse->srcpad, GST_DEBUG_FUNCPTR (gst_base_parse_src_event)); gst_pad_set_query_function (parse->srcpad, GST_DEBUG_FUNCPTR (gst_base_parse_src_query)); gst_pad_use_fixed_caps (parse->srcpad); gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad); GST_DEBUG_OBJECT (parse, "src created"); g_queue_init (&parse->priv->queued_frames); parse->priv->adapter = gst_adapter_new (); parse->priv->pad_mode = GST_PAD_MODE_NONE; g_mutex_init (&parse->priv->index_lock); /* init state */ gst_base_parse_reset (parse); GST_DEBUG_OBJECT (parse, "init ok"); GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE); } static GstBaseParseFrame * gst_base_parse_frame_copy (GstBaseParseFrame * frame) { GstBaseParseFrame *copy; copy = g_slice_dup (GstBaseParseFrame, frame); copy->buffer = gst_buffer_ref (frame->buffer); copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC; GST_TRACE ("copied frame %p -> %p", frame, copy); return copy; } void gst_base_parse_frame_free (GstBaseParseFrame * frame) { GST_TRACE ("freeing frame %p", frame); if (frame->buffer) { gst_buffer_unref (frame->buffer); frame->buffer = NULL; } if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) { g_slice_free (GstBaseParseFrame, frame); } else { memset (frame, 0, sizeof (*frame)); } } G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame, (GBoxedCopyFunc) gst_base_parse_frame_copy, (GBoxedFreeFunc) gst_base_parse_frame_free); /** * gst_base_parse_frame_init: * @frame: #GstBaseParseFrame. * * Sets a #GstBaseParseFrame to initial state. Currently this means * all public fields are zero-ed and a private flag is set to make * sure gst_base_parse_frame_free() only frees the contents but not * the actual frame. Use this function to initialise a #GstBaseParseFrame * allocated on the stack. */ void gst_base_parse_frame_init (GstBaseParseFrame * frame) { memset (frame, 0, sizeof (GstBaseParseFrame)); frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC; GST_TRACE ("inited frame %p", frame); } /** * gst_base_parse_frame_new: * @buffer: (transfer none): a #GstBuffer * @flags: the flags * @overhead: number of bytes in this frame which should be counted as * metadata overhead, ie. not used to calculate the average bitrate. * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0. * * Allocates a new #GstBaseParseFrame. This function is mainly for bindings, * elements written in C should usually allocate the frame on the stack and * then use gst_base_parse_frame_init() to initialise it. * * Returns: a newly-allocated #GstBaseParseFrame. Free with * gst_base_parse_frame_free() when no longer needed. */ GstBaseParseFrame * gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags, gint overhead) { GstBaseParseFrame *frame; frame = g_slice_new0 (GstBaseParseFrame); frame->buffer = gst_buffer_ref (buffer); GST_TRACE ("created frame %p", frame); return frame; } static inline void gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame, GstBuffer * buf) { gst_buffer_replace (&frame->buffer, buf); parse->flags = 0; /* set flags one by one for clarity */ if (G_UNLIKELY (parse->priv->drain)) parse->flags |= GST_BASE_PARSE_FLAG_DRAINING; /* losing sync is pretty much a discont (and vice versa), no ? */ if (G_UNLIKELY (parse->priv->discont)) parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC; } static void gst_base_parse_reset (GstBaseParse * parse) { GST_OBJECT_LOCK (parse); gst_segment_init (&parse->segment, GST_FORMAT_TIME); parse->priv->duration = -1; parse->priv->min_frame_size = 1; parse->priv->discont = TRUE; parse->priv->flushing = FALSE; parse->priv->offset = 0; parse->priv->sync_offset = 0; parse->priv->update_interval = -1; parse->priv->fps_num = parse->priv->fps_den = 0; parse->priv->frame_duration = GST_CLOCK_TIME_NONE; parse->priv->lead_in = parse->priv->lead_out = 0; parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0; parse->priv->bitrate = 0; parse->priv->framecount = 0; parse->priv->bytecount = 0; parse->priv->acc_duration = 0; parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE; parse->priv->first_frame_offset = -1; parse->priv->estimated_duration = -1; parse->priv->estimated_drift = 0; parse->priv->next_ts = 0; parse->priv->syncable = TRUE; parse->priv->passthrough = FALSE; parse->priv->has_timing_info = FALSE; parse->priv->post_min_bitrate = TRUE; parse->priv->post_avg_bitrate = TRUE; parse->priv->post_max_bitrate = TRUE; parse->priv->min_bitrate = G_MAXUINT; parse->priv->max_bitrate = 0; parse->priv->avg_bitrate = 0; parse->priv->posted_avg_bitrate = 0; parse->priv->index_last_ts = GST_CLOCK_TIME_NONE; parse->priv->index_last_offset = -1; parse->priv->index_last_valid = TRUE; parse->priv->upstream_seekable = FALSE; parse->priv->upstream_size = 0; parse->priv->upstream_has_duration = FALSE; parse->priv->idx_interval = 0; parse->priv->exact_position = TRUE; parse->priv->seen_keyframe = FALSE; parse->priv->last_ts = GST_CLOCK_TIME_NONE; parse->priv->last_offset = 0; g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref, NULL); g_list_free (parse->priv->pending_events); parse->priv->pending_events = NULL; parse->priv->pending_segment = FALSE; if (parse->priv->cache) { gst_buffer_unref (parse->priv->cache); parse->priv->cache = NULL; } g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL); g_slist_free (parse->priv->pending_seeks); parse->priv->pending_seeks = NULL; if (parse->priv->adapter) gst_adapter_clear (parse->priv->adapter); parse->priv->new_frame = TRUE; g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL); g_list_free (parse->priv->detect_buffers); parse->priv->detect_buffers = NULL; parse->priv->detect_buffers_size = 0; GST_OBJECT_UNLOCK (parse); } /* gst_base_parse_parse_frame: * @parse: #GstBaseParse. * @buffer: #GstBuffer. * * Default callback for parse_frame. */ static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame) { GstBuffer *buffer = frame->buffer; if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) { GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts; } if (!GST_BUFFER_DURATION_IS_VALID (buffer) && GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) { GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration; } return GST_FLOW_OK; } /* gst_base_parse_convert: * @parse: #GstBaseParse. * @src_format: #GstFormat describing the source format. * @src_value: Source value to be converted. * @dest_format: #GstFormat defining the converted format. * @dest_value: Pointer where the conversion result will be put. * * Converts using configured "convert" vmethod in #GstBaseParse class. * * Returns: TRUE if conversion was successful. */ static gboolean gst_base_parse_convert (GstBaseParse * parse, GstFormat src_format, gint64 src_value, GstFormat dest_format, gint64 * dest_value) { GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse); gboolean ret; g_return_val_if_fail (dest_value != NULL, FALSE); if (!klass->convert) return FALSE; ret = klass->convert (parse, src_format, src_value, dest_format, dest_value); #ifndef GST_DISABLE_GST_DEBUG { if (ret) { if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) { GST_LOG_OBJECT (parse, "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT, GST_TIME_ARGS (src_value), *dest_value); } else if (dest_format == GST_FORMAT_TIME && src_format == GST_FORMAT_BYTES) { GST_LOG_OBJECT (parse, "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT, src_value, GST_TIME_ARGS (*dest_value)); } else { GST_LOG_OBJECT (parse, "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT, GST_STR_NULL (gst_format_get_name (src_format)), GST_STR_NULL (gst_format_get_name (dest_format)), src_value, *dest_value); } } else { GST_DEBUG_OBJECT (parse, "conversion failed"); } } #endif return ret; } /* gst_base_parse_sink_event: * @pad: #GstPad that received the event. * @event: #GstEvent to be handled. * * Handler for sink pad events. * * Returns: TRUE if the event was handled. */ static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event) { GstBaseParse *parse; GstBaseParseClass *bclass; gboolean ret; parse = GST_BASE_PARSE (parent); bclass = GST_BASE_PARSE_GET_CLASS (parse); GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event), GST_EVENT_TYPE_NAME (event)); /* Cache all serialized events except EOS, SEGMENT and FLUSH_STOP if we have a * pending segment */ if (parse->priv->pending_segment && GST_EVENT_IS_SERIALIZED (event) && GST_EVENT_TYPE (event) != GST_EVENT_EOS && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP && GST_EVENT_TYPE (event) != GST_EVENT_CAPS) { if (GST_EVENT_TYPE (event) == GST_EVENT_TAG) /* See if any bitrate tags were posted */ gst_base_parse_handle_tag (parse, event); parse->priv->pending_events = g_list_append (parse->priv->pending_events, event); ret = TRUE; } else { if (GST_EVENT_TYPE (event) == GST_EVENT_EOS && parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) /* We've not posted bitrate tags yet - do so now */ gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE); if (bclass->sink_event) ret = bclass->sink_event (parse, event); else { gst_event_unref (event); ret = FALSE; } } GST_DEBUG_OBJECT (parse, "event handled"); return ret; } /* gst_base_parse_sink_eventfunc: * @parse: #GstBaseParse. * @event: #GstEvent to be handled. * * Element-level event handler function. * * The event will be unreffed only if it has been handled and this * function returns %TRUE * * Returns: %TRUE if the event was handled and not need forwarding. */ static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event) { gboolean ret; switch (GST_EVENT_TYPE (event)) { case GST_EVENT_CAPS: { GstCaps *caps; GstBaseParseClass *klass; klass = GST_BASE_PARSE_GET_CLASS (parse); gst_event_parse_caps (event, &caps); GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps); if (klass->set_sink_caps) ret = klass->set_sink_caps (parse, caps); else ret = TRUE; /* will send our own caps downstream */ gst_event_unref (event); break; } case GST_EVENT_SEGMENT: { const GstSegment *in_segment; GstSegment out_segment; gint64 offset = 0, next_ts; #if 0 gdouble rate, applied_rate; GstFormat format; gint64 start, stop, pos, next_ts; gboolean update; #endif gst_event_parse_segment (event, &in_segment); gst_segment_init (&out_segment, GST_FORMAT_TIME); GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment); if (in_segment->format == GST_FORMAT_BYTES) { GstBaseParseSeek *seek = NULL; GSList *node; /* stop time is allowed to be open-ended, but not start & pos */ offset = in_segment->time; GST_OBJECT_LOCK (parse); for (node = parse->priv->pending_seeks; node; node = node->next) { GstBaseParseSeek *tmp = node->data; if (tmp->offset == offset) { seek = tmp; break; } } parse->priv->pending_seeks = g_slist_remove (parse->priv->pending_seeks, seek); GST_OBJECT_UNLOCK (parse); if (seek) { GST_DEBUG_OBJECT (parse, "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT, seek->accurate ? " accurate" : "", &seek->segment); out_segment.start = seek->segment.start; out_segment.stop = seek->segment.stop; out_segment.time = seek->segment.start; next_ts = seek->start_ts; parse->priv->exact_position = seek->accurate; g_free (seek); } else { /* best attempt convert */ /* as these are only estimates, stop is kept open-ended to avoid * premature cutting */ gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start, GST_FORMAT_TIME, (gint64 *) & next_ts); out_segment.start = next_ts; out_segment.stop = GST_CLOCK_TIME_NONE; out_segment.time = next_ts; parse->priv->exact_position = (in_segment->start == 0); } gst_event_unref (event); event = gst_event_new_segment (&out_segment); GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %" GST_SEGMENT_FORMAT, in_segment); } else if (in_segment->format != GST_FORMAT_TIME) { /* Unknown incoming segment format. Output a default open-ended * TIME segment */ gst_event_unref (event); out_segment.start = 0; out_segment.stop = GST_CLOCK_TIME_NONE; out_segment.time = 0; event = gst_event_new_segment (&out_segment); next_ts = 0; } else { /* not considered BYTE seekable if it is talking to us in TIME, * whatever else it might claim */ parse->priv->upstream_seekable = FALSE; next_ts = in_segment->start; } memcpy (&parse->segment, &out_segment, sizeof (GstSegment)); /* gst_segment_set_newsegment (&parse->segment, update, rate, applied_rate, format, start, stop, start); */ /* save the segment for later, right before we push a new buffer so that * the caps are fixed and the next linked element can receive * the segment. */ parse->priv->pending_events = g_list_append (parse->priv->pending_events, event); parse->priv->pending_segment = TRUE; ret = TRUE; /* but finish the current segment */ GST_DEBUG_OBJECT (parse, "draining current segment"); if (in_segment->rate > 0.0) gst_base_parse_drain (parse); else gst_base_parse_finish_fragment (parse, FALSE); gst_adapter_clear (parse->priv->adapter); parse->priv->offset = offset; parse->priv->sync_offset = offset; parse->priv->next_ts = next_ts; parse->priv->last_ts = GST_CLOCK_TIME_NONE; parse->priv->discont = TRUE; parse->priv->seen_keyframe = FALSE; break; } case GST_EVENT_FLUSH_START: parse->priv->flushing = TRUE; ret = gst_pad_push_event (parse->srcpad, event); /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */ GST_PAD_STREAM_LOCK (parse->srcpad); GST_PAD_STREAM_UNLOCK (parse->srcpad); break; case GST_EVENT_FLUSH_STOP: ret = gst_pad_push_event (parse->srcpad, event); gst_adapter_clear (parse->priv->adapter); gst_base_parse_clear_queues (parse); parse->priv->flushing = FALSE; parse->priv->discont = TRUE; parse->priv->last_ts = GST_CLOCK_TIME_NONE; parse->priv->new_frame = TRUE; break; case GST_EVENT_EOS: if (parse->segment.rate > 0.0) gst_base_parse_drain (parse); else gst_base_parse_finish_fragment (parse, TRUE); /* If we STILL have zero frames processed, fire an error */ if (parse->priv->framecount == 0) { GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE, ("No valid frames found before end of stream"), (NULL)); } /* newsegment and other serialized events before eos */ if (G_UNLIKELY (parse->priv->pending_events)) { GList *l; for (l = parse->priv->pending_events; l != NULL; l = l->next) { gst_pad_push_event (parse->srcpad, GST_EVENT (l->data)); } g_list_free (parse->priv->pending_events); parse->priv->pending_events = NULL; parse->priv->pending_segment = FALSE; } ret = gst_pad_push_event (parse->srcpad, event); break; default: ret = gst_pad_event_default (parse->sinkpad, GST_OBJECT_CAST (parse), event); break; } return ret; } static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query) { GstBaseParse *parse; GstBaseParseClass *bclass; gboolean res; parse = GST_BASE_PARSE (parent); bclass = GST_BASE_PARSE_GET_CLASS (parse); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_CAPS: { if (bclass->get_sink_caps) { GstCaps *caps, *filter; gst_query_parse_caps (query, &filter); caps = bclass->get_sink_caps (parse, filter); GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT, caps); gst_query_set_caps_result (query, caps); gst_caps_unref (caps); res = TRUE; } else { GstCaps *caps, *template_caps, *filter; gst_query_parse_caps (query, &filter); template_caps = gst_pad_get_pad_template_caps (pad); if (filter != NULL) { caps = gst_caps_intersect_full (filter, template_caps, GST_CAPS_INTERSECT_FIRST); gst_caps_unref (template_caps); } else { caps = template_caps; } gst_query_set_caps_result (query, caps); gst_caps_unref (caps); res = TRUE; } break; } default: { res = gst_pad_query_default (pad, parent, query); break; } } return res; } /* gst_base_parse_src_event: * @pad: #GstPad that received the event. * @event: #GstEvent that was received. * * Handler for source pad events. * * Returns: TRUE if the event was handled. */ static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event) { GstBaseParse *parse; GstBaseParseClass *bclass; gboolean ret = TRUE; parse = GST_BASE_PARSE (parent); bclass = GST_BASE_PARSE_GET_CLASS (parse); GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event), GST_EVENT_TYPE_NAME (event)); if (bclass->src_event) ret = bclass->src_event (parse, event); else gst_event_unref (event); return ret; } static gboolean gst_base_parse_is_seekable (GstBaseParse * parse) { /* FIXME: could do more here, e.g. check index or just send data from 0 * in pull mode and let decoder/sink clip */ return parse->priv->syncable; } /* gst_base_parse_src_eventfunc: * @parse: #GstBaseParse. * @event: #GstEvent that was received. * * Default srcpad event handler. * * Returns: TRUE if the event was handled and can be dropped. */ static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event) { gboolean res = FALSE; switch (GST_EVENT_TYPE (event)) { case GST_EVENT_SEEK: if (gst_base_parse_is_seekable (parse)) res = gst_base_parse_handle_seek (parse, event); break; default: res = gst_pad_event_default (parse->srcpad, GST_OBJECT_CAST (parse), event); break; } return res; } /** * gst_base_parse_convert_default: * @parse: #GstBaseParse. * @src_format: #GstFormat describing the source format. * @src_value: Source value to be converted. * @dest_format: #GstFormat defining the converted format. * @dest_value: Pointer where the conversion result will be put. * * Default implementation of "convert" vmethod in #GstBaseParse class. * * Returns: TRUE if conversion was successful. */ gboolean gst_base_parse_convert_default (GstBaseParse * parse, GstFormat src_format, gint64 src_value, GstFormat dest_format, gint64 * dest_value) { gboolean ret = FALSE; guint64 bytes, duration; if (G_UNLIKELY (src_format == dest_format)) { *dest_value = src_value; return TRUE; } if (G_UNLIKELY (src_value == -1)) { *dest_value = -1; return TRUE; } if (G_UNLIKELY (src_value == 0)) { *dest_value = 0; return TRUE; } /* need at least some frames */ if (!parse->priv->framecount) goto no_framecount; duration = parse->priv->acc_duration / GST_MSECOND; bytes = parse->priv->bytecount; if (G_UNLIKELY (!duration || !bytes)) goto no_duration_bytes; if (src_format == GST_FORMAT_BYTES) { if (dest_format == GST_FORMAT_TIME) { /* BYTES -> TIME conversion */ GST_DEBUG_OBJECT (parse, "converting bytes -> time"); *dest_value = gst_util_uint64_scale (src_value, duration, bytes); *dest_value *= GST_MSECOND; GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms", *dest_value / GST_MSECOND); ret = TRUE; } else { GST_DEBUG_OBJECT (parse, "converting bytes -> other not implemented"); } } else if (src_format == GST_FORMAT_TIME) { if (dest_format == GST_FORMAT_BYTES) { GST_DEBUG_OBJECT (parse, "converting time -> bytes"); *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes, duration); GST_DEBUG_OBJECT (parse, "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT, src_value / GST_MSECOND, *dest_value); ret = TRUE; } else { GST_DEBUG_OBJECT (parse, "converting time -> other not implemented"); } } else if (src_format == GST_FORMAT_DEFAULT) { /* DEFAULT == frame-based */ if (dest_format == GST_FORMAT_TIME) { GST_DEBUG_OBJECT (parse, "converting default -> time"); if (parse->priv->fps_den) { *dest_value = gst_util_uint64_scale (src_value, GST_SECOND * parse->priv->fps_den, parse->priv->fps_num); ret = TRUE; } } else { GST_DEBUG_OBJECT (parse, "converting default -> other not implemented"); } } else { GST_DEBUG_OBJECT (parse, "conversion not implemented"); } return ret; /* ERRORS */ no_framecount: { GST_DEBUG_OBJECT (parse, "no framecount"); return FALSE; } no_duration_bytes: { GST_DEBUG_OBJECT (parse, "no duration %" G_GUINT64_FORMAT ", bytes %" G_GUINT64_FORMAT, duration, bytes); return FALSE; } } static void gst_base_parse_update_duration (GstBaseParse * baseparse) { GstPad *peer; GstBaseParse *parse; parse = GST_BASE_PARSE (baseparse); peer = gst_pad_get_peer (parse->sinkpad); if (peer) { gboolean qres = FALSE; gint64 ptot, dest_value; qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot); gst_object_unref (GST_OBJECT (peer)); if (qres) { if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot, GST_FORMAT_TIME, &dest_value)) { /* inform if duration changed, but try to avoid spamming */ parse->priv->estimated_drift += dest_value - parse->priv->estimated_duration; if (parse->priv->estimated_drift > GST_SECOND || parse->priv->estimated_drift < -GST_SECOND) { gst_element_post_message (GST_ELEMENT (parse), gst_message_new_duration (GST_OBJECT (parse), GST_FORMAT_TIME, dest_value)); parse->priv->estimated_drift = 0; } parse->priv->estimated_duration = dest_value; GST_LOG_OBJECT (parse, "updated estimated duration to %" GST_TIME_FORMAT, GST_TIME_ARGS (dest_value)); } } } } static void gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min, gboolean post_avg, gboolean post_max) { GstTagList *taglist = NULL; if (post_min && parse->priv->post_min_bitrate) { taglist = gst_tag_list_new_empty (); gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL); } if (post_avg && parse->priv->post_avg_bitrate) { if (taglist == NULL) taglist = gst_tag_list_new_empty (); parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate; gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE, parse->priv->avg_bitrate, NULL); } if (post_max && parse->priv->post_max_bitrate) { if (taglist == NULL) taglist = gst_tag_list_new_empty (); gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL); } GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u", parse->priv->min_bitrate, parse->priv->avg_bitrate, parse->priv->max_bitrate); if (taglist != NULL) { gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist)); } } /* gst_base_parse_update_bitrates: * @parse: #GstBaseParse. * @buffer: Current frame as a #GstBuffer * * Keeps track of the minimum and maximum bitrates, and also maintains a * running average bitrate of the stream so far. */ static void gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame) { /* Only update the tag on a 10 kbps delta */ static const gint update_threshold = 10000; guint64 data_len, frame_dur; gint overhead, frame_bitrate, old_avg_bitrate; gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE; GstBuffer *buffer = frame->buffer; overhead = frame->overhead; if (overhead == -1) return; data_len = gst_buffer_get_size (buffer) - overhead; parse->priv->data_bytecount += data_len; /* duration should be valid by now, * either set by subclass or maybe based on fps settings */ if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) { /* Calculate duration of a frame from buffer properties */ frame_dur = GST_BUFFER_DURATION (buffer); parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) / parse->priv->acc_duration; } else { /* No way to figure out frame duration (is this even possible?) */ return; } /* override if subclass provided bitrate, e.g. metadata based */ if (parse->priv->bitrate) { parse->priv->avg_bitrate = parse->priv->bitrate; /* spread this (confirmed) info ASAP */ if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate) gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE); } if (frame_dur) frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur; else return; GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate, parse->priv->avg_bitrate); if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) { goto exit; } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) { /* always post all at threshold time */ update_min = update_max = update_avg = TRUE; } if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) { if (frame_bitrate < parse->priv->min_bitrate) { parse->priv->min_bitrate = frame_bitrate; update_min = TRUE; } if (frame_bitrate > parse->priv->max_bitrate) { parse->priv->max_bitrate = frame_bitrate; update_max = TRUE; } old_avg_bitrate = parse->priv->posted_avg_bitrate; if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) > update_threshold) update_avg = TRUE; } if ((update_min || update_avg || update_max)) gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max); exit: return; } /** * gst_base_parse_add_index_entry: * @parse: #GstBaseParse. * @offset: offset of entry * @ts: timestamp associated with offset * @key: whether entry refers to keyframe * @force: add entry disregarding sanity checks * * Adds an entry to the index associating @offset to @ts. It is recommended * to only add keyframe entries. @force allows to bypass checks, such as * whether the stream is (upstream) seekable, another entry is already "close" * to the new entry, etc. * * Returns: #gboolean indicating whether entry was added */ gboolean gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset, GstClockTime ts, gboolean key, gboolean force) { gboolean ret = FALSE; GstIndexAssociation associations[2]; GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset); if (G_LIKELY (!force)) { if (!parse->priv->upstream_seekable) { GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding"); goto exit; } /* FIXME need better helper data structure that handles these issues * related to ongoing collecting of index entries */ if (parse->priv->index_last_offset >= (gint64) offset) { GST_DEBUG_OBJECT (parse, "already have entries up to offset " "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset); goto exit; } if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) && GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) < parse->priv->idx_interval) { GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT, GST_TIME_ARGS (parse->priv->index_last_ts)); goto exit; } /* if last is not really the last one */ if (!parse->priv->index_last_valid) { GstClockTime prev_ts; gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts); if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) { GST_DEBUG_OBJECT (parse, "entry too close to existing entry %" GST_TIME_FORMAT, GST_TIME_ARGS (prev_ts)); parse->priv->index_last_offset = offset; parse->priv->index_last_ts = ts; goto exit; } } } associations[0].format = GST_FORMAT_TIME; associations[0].value = ts; associations[1].format = GST_FORMAT_BYTES; associations[1].value = offset; /* index might change on-the-fly, although that would be nutty app ... */ GST_BASE_PARSE_INDEX_LOCK (parse); gst_index_add_associationv (parse->priv->index, parse->priv->index_id, (key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT : GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2, (const GstIndexAssociation *) &associations); GST_BASE_PARSE_INDEX_UNLOCK (parse); if (key) { parse->priv->index_last_offset = offset; parse->priv->index_last_ts = ts; } ret = TRUE; exit: return ret; } /* check for seekable upstream, above and beyond a mere query */ static void gst_base_parse_check_seekability (GstBaseParse * parse) { GstQuery *query; gboolean seekable = FALSE; gint64 start = -1, stop = -1; guint idx_interval = 0; query = gst_query_new_seeking (GST_FORMAT_BYTES); if (!gst_pad_peer_query (parse->sinkpad, query)) { GST_DEBUG_OBJECT (parse, "seeking query failed"); goto done; } gst_query_parse_seeking (query, NULL, &seekable, &start, &stop); /* try harder to query upstream size if we didn't get it the first time */ if (seekable && stop == -1) { GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop"); gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop); } /* if upstream doesn't know the size, it's likely that it's not seekable in * practice even if it technically may be seekable */ if (seekable && (start != 0 || stop <= start)) { GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable"); seekable = FALSE; } /* let's not put every single frame into our index */ if (seekable) { if (stop < 10 * 1024 * 1024) idx_interval = 100; else if (stop < 100 * 1024 * 1024) idx_interval = 500; else idx_interval = 1000; } done: gst_query_unref (query); GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %" G_GUINT64_FORMAT ")", seekable, start, stop); parse->priv->upstream_seekable = seekable; parse->priv->upstream_size = seekable ? stop : 0; GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval); parse->priv->idx_interval = idx_interval * GST_MSECOND; } /* some misc checks on upstream */ static void gst_base_parse_check_upstream (GstBaseParse * parse) { gint64 stop; if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop)) if (GST_CLOCK_TIME_IS_VALID (stop) && stop) { /* upstream has one, accept it also, and no further updates */ gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0); parse->priv->upstream_has_duration = TRUE; } GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d", parse->priv->upstream_has_duration); } /* checks src caps to determine if dealing with audio or video */ /* TODO maybe forego automagic stuff and let subclass configure it ? */ static void gst_base_parse_check_media (GstBaseParse * parse) { GstCaps *caps; GstStructure *s; caps = gst_pad_get_current_caps (parse->srcpad); if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) { parse->priv->is_video = g_str_has_prefix (gst_structure_get_name (s), "video"); } else { /* historical default */ parse->priv->is_video = FALSE; } if (caps) gst_caps_unref (caps); GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video); } /* takes ownership of frame */ static void gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame) { if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) { /* frame allocated on the heap, we can just take ownership */ g_queue_push_tail (&parse->priv->queued_frames, frame); GST_TRACE ("queued frame %p", frame); } else { GstBaseParseFrame *copy; /* probably allocated on the stack, must make a proper copy */ copy = gst_base_parse_frame_copy (frame); g_queue_push_tail (&parse->priv->queued_frames, copy); GST_TRACE ("queued frame %p (copy of %p)", copy, frame); gst_base_parse_frame_free (frame); } } /* makes sure that @buf is properly prepared and decorated for passing * to baseclass, and an equally setup frame is returned setup with @buf. * Takes ownership of @buf. */ static GstBaseParseFrame * gst_base_parse_prepare_frame (GstBaseParse * parse, GstBuffer * buffer) { GstBaseParseFrame *frame = NULL; buffer = gst_buffer_make_writable (buffer); GST_LOG_OBJECT (parse, "preparing frame at offset %" G_GUINT64_FORMAT " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT, GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer), gst_buffer_get_size (buffer)); if (parse->priv->discont) { GST_DEBUG_OBJECT (parse, "marking DISCONT"); GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT); parse->priv->discont = FALSE; } GST_BUFFER_OFFSET (buffer) = parse->priv->offset; frame = gst_base_parse_frame_new (buffer, 0, 0); /* also ensure to update state flags */ gst_base_parse_frame_update (parse, frame, buffer); gst_buffer_unref (buffer); if (parse->priv->prev_offset != parse->priv->offset || parse->priv->new_frame) { GST_LOG_OBJECT (parse, "marking as new frame"); parse->priv->new_frame = FALSE; frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME; } frame->offset = parse->priv->prev_offset = parse->priv->offset; /* use default handler to provide initial (upstream) metadata */ gst_base_parse_parse_frame (parse, frame); return frame; } /* Wraps buffer in a frame and dispatches to subclass. * Also manages data skipping and offset handling (including adapter flushing). * Takes ownership of @buffer */ static GstFlowReturn gst_base_parse_handle_buffer (GstBaseParse * parse, GstBuffer * buffer, gint * skip, gint * flushed) { GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse); GstBaseParseFrame *frame; GstFlowReturn ret; g_return_val_if_fail (skip != NULL || flushed != NULL, GST_FLOW_ERROR); GST_LOG_OBJECT (parse, "handling buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)), GST_TIME_ARGS (GST_BUFFER_DURATION (buffer))); /* track what is being flushed during this single round of frame processing */ parse->priv->flushed = 0; *skip = 0; /* make it easy for _finish_frame to pick up input data */ if (parse->priv->pad_mode == GST_PAD_MODE_PULL) { gst_buffer_ref (buffer); gst_adapter_push (parse->priv->adapter, buffer); } frame = gst_base_parse_prepare_frame (parse, buffer); ret = klass->handle_frame (parse, frame, skip); *flushed = parse->priv->flushed; GST_LOG_OBJECT (parse, "handle_frame skipped %d, flushed %d", *skip, *flushed); /* subclass can only do one of these, or semantics are too unclear */ g_assert (*skip == 0 || *flushed == 0); /* track skipping */ if (*skip > 0) { GstClockTime timestamp; GstBuffer *outbuf; GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", *skip); if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) { /* reverse playback, and no frames found yet, so we are skipping * the leading part of a fragment, which may form the tail of * fragment coming later, hopefully subclass skips efficiently ... */ timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL); outbuf = gst_adapter_take_buffer (parse->priv->adapter, *skip); outbuf = gst_buffer_make_writable (outbuf); GST_BUFFER_TIMESTAMP (outbuf) = timestamp; parse->priv->buffers_head = g_slist_prepend (parse->priv->buffers_head, outbuf); outbuf = NULL; } else { gst_adapter_flush (parse->priv->adapter, *skip); } if (!parse->priv->discont) parse->priv->sync_offset = parse->priv->offset; parse->priv->offset += *skip; parse->priv->discont = TRUE; /* check for indefinite skipping */ if (ret == GST_FLOW_OK) ret = gst_base_parse_check_sync (parse); } parse->priv->offset += *flushed; if (parse->priv->pad_mode == GST_PAD_MODE_PULL) { gst_adapter_clear (parse->priv->adapter); } gst_base_parse_frame_free (frame); return ret; } /* gst_base_parse_handle_and_push_buffer: * @parse: #GstBaseParse. * @klass: #GstBaseParseClass. * @frame: (transfer full): a #GstBaseParseFrame * * Parses the frame from given buffer and pushes it forward. Also performs * timestamp handling and checks the segment limits. * * This is called with srcpad STREAM_LOCK held. * * Returns: #GstFlowReturn */ static GstFlowReturn gst_base_parse_handle_and_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame) { gint64 offset; GstBuffer *buffer; g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR); buffer = frame->buffer; offset = frame->offset; /* check if subclass/format can provide ts. * If so, that allows and enables extra seek and duration determining options */ if (G_UNLIKELY (parse->priv->first_frame_offset < 0)) { if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info && parse->priv->pad_mode == GST_PAD_MODE_PULL) { parse->priv->first_frame_offset = offset; parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer); GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT " for first frame at offset %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->first_frame_ts), parse->priv->first_frame_offset); if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) { gint64 off; GstClockTime last_ts = G_MAXINT64; GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine"); gst_base_parse_locate_time (parse, &last_ts, &off); if (GST_CLOCK_TIME_IS_VALID (last_ts)) gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0); } } else { /* disable further checks */ parse->priv->first_frame_offset = 0; } } /* again use default handler to add missing metadata; * we may have new information on frame properties */ gst_base_parse_parse_frame (parse, frame); if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && GST_BUFFER_DURATION_IS_VALID (buffer)) { parse->priv->next_ts = GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer); } else { /* we lost track, do not produce bogus time next time around * (probably means parser subclass has given up on parsing as well) */ GST_DEBUG_OBJECT (parse, "no next fallback timestamp"); parse->priv->next_ts = GST_CLOCK_TIME_NONE; } if (parse->priv->upstream_seekable && parse->priv->exact_position && GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) gst_base_parse_add_index_entry (parse, offset, GST_BUFFER_TIMESTAMP (buffer), !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE); /* All OK, push queued frames if there are any */ if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) { GstBaseParseFrame *queued_frame; while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) { gst_base_parse_push_frame (parse, queued_frame); } } return gst_base_parse_push_frame (parse, frame); } /** * gst_base_parse_push_frame: * @parse: #GstBaseParse. * @frame: (transfer none): a #GstBaseParseFrame * * Pushes the frame's buffer downstream, sends any pending events and * does some timestamp and segment handling. Takes ownership of * frame's buffer, though caller retains ownership of @frame. * * This must be called with sinkpad STREAM_LOCK held. * * Returns: #GstFlowReturn */ GstFlowReturn gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame) { GstFlowReturn ret = GST_FLOW_OK; GstClockTime last_start = GST_CLOCK_TIME_NONE; GstClockTime last_stop = GST_CLOCK_TIME_NONE; GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse); GstBuffer *buffer; gsize size; g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR); g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR); GST_TRACE_OBJECT (parse, "pushing frame %p", frame); buffer = frame->buffer; GST_LOG_OBJECT (parse, "processing buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)), GST_TIME_ARGS (GST_BUFFER_DURATION (buffer))); /* update stats */ parse->priv->bytecount += frame->size; if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) { parse->priv->framecount++; if (GST_BUFFER_DURATION_IS_VALID (buffer)) { parse->priv->acc_duration += GST_BUFFER_DURATION (buffer); } } /* 0 means disabled */ if (parse->priv->update_interval < 0) parse->priv->update_interval = 50; else if (parse->priv->update_interval > 0 && (parse->priv->framecount % parse->priv->update_interval) == 0) gst_base_parse_update_duration (parse); if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer); if (last_start != GST_CLOCK_TIME_NONE && GST_BUFFER_DURATION_IS_VALID (buffer)) last_stop = last_start + GST_BUFFER_DURATION (buffer); /* should have caps by now */ if (!gst_pad_has_current_caps (parse->srcpad)) goto no_caps; if (G_UNLIKELY (parse->priv->pending_segment)) { /* have caps; check identity */ gst_base_parse_check_media (parse); } /* Push pending events, including NEWSEGMENT events */ if (G_UNLIKELY (parse->priv->pending_events)) { GList *l; for (l = parse->priv->pending_events; l != NULL; l = l->next) { gst_pad_push_event (parse->srcpad, GST_EVENT (l->data)); } g_list_free (parse->priv->pending_events); parse->priv->pending_events = NULL; parse->priv->pending_segment = FALSE; } /* segment adjustment magic; only if we are running the whole show */ if (!parse->priv->passthrough && parse->segment.rate > 0.0 && (parse->priv->pad_mode == GST_PAD_MODE_PULL || parse->priv->upstream_seekable)) { /* handle gaps */ if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) && GST_CLOCK_TIME_IS_VALID (last_start)) { GstClockTimeDiff diff; /* only send newsegments with increasing start times, * otherwise if these go back and forth downstream (sinks) increase * accumulated time and running_time */ diff = GST_CLOCK_DIFF (parse->segment.position, last_start); if (G_UNLIKELY (diff > 2 * GST_SECOND && last_start > parse->segment.start && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop) || last_start < parse->segment.stop))) { GST_DEBUG_OBJECT (parse, "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%" GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). " "Sending updated NEWSEGMENT events", diff, GST_TIME_ARGS (parse->segment.position), GST_TIME_ARGS (last_start)); /* skip gap FIXME */ gst_pad_push_event (parse->srcpad, gst_event_new_segment (&parse->segment)); parse->segment.position = last_start; } } } /* update bitrates and optionally post corresponding tags * (following newsegment) */ gst_base_parse_update_bitrates (parse, frame); if (klass->pre_push_frame) { ret = klass->pre_push_frame (parse, frame); } else { frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP; } /* take final ownership of frame buffer */ if (frame->out_buffer) { buffer = frame->out_buffer; frame->out_buffer = NULL; gst_buffer_replace (&frame->buffer, NULL); } else { buffer = frame->buffer; frame->buffer = NULL; } /* subclass must play nice */ g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR); size = gst_buffer_get_size (buffer); parse->priv->seen_keyframe |= parse->priv->is_video && !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT); if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) { if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && GST_CLOCK_TIME_IS_VALID (parse->segment.stop) && GST_BUFFER_TIMESTAMP (buffer) > parse->segment.stop + parse->priv->lead_out_ts) { GST_LOG_OBJECT (parse, "Dropped frame, after segment"); ret = GST_FLOW_EOS; } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && GST_BUFFER_DURATION_IS_VALID (buffer) && GST_CLOCK_TIME_IS_VALID (parse->segment.start) && GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) + parse->priv->lead_in_ts < parse->segment.start) { if (parse->priv->seen_keyframe) { GST_LOG_OBJECT (parse, "Frame before segment, after keyframe"); ret = GST_FLOW_OK; } else { GST_LOG_OBJECT (parse, "Dropped frame, before segment"); ret = GST_BASE_PARSE_FLOW_DROPPED; } } else { ret = GST_FLOW_OK; } } if (ret == GST_BASE_PARSE_FLOW_DROPPED) { GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size); gst_buffer_unref (buffer); ret = GST_FLOW_OK; } else if (ret == GST_FLOW_OK) { if (parse->segment.rate > 0.0) { GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..", size); ret = gst_pad_push (parse->srcpad, buffer); GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret)); } else { GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now", size); parse->priv->buffers_queued = g_slist_prepend (parse->priv->buffers_queued, buffer); ret = GST_FLOW_OK; } } else { GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s", size, gst_flow_get_name (ret)); gst_buffer_unref (buffer); /* if we are not sufficiently in control, let upstream decide on EOS */ if (ret == GST_FLOW_EOS && (parse->priv->passthrough || (parse->priv->pad_mode == GST_PAD_MODE_PUSH && !parse->priv->upstream_seekable))) ret = GST_FLOW_OK; } /* Update current running segment position */ if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE && parse->segment.position < last_stop) parse->segment.position = last_stop; return ret; /* ERRORS */ no_caps: { GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL)); return GST_FLOW_ERROR; } } /** * gst_base_parse_finish_frame: * @parse: a #GstBaseParse * @frame: a #GstBaseParseFrame * @size: consumed input data represented by frame * * Collects parsed data and pushes this downstream. * Source pad caps must be set when this is called. * * If @frame's out_buffer is set, that will be used as subsequent frame data. * Otherwise, @size samples will be taken from the input and used for output, * and the output's metadata (timestamps etc) will be taken as (optionally) * set by the subclass on @frame's (input) buffer (which is otherwise * ignored for any but the above purpose/information). * * Note that the latter buffer is invalidated by this call, whereas the * caller retains ownership of @frame. * * Returns: a #GstFlowReturn that should be escalated to caller (of caller) */ GstFlowReturn gst_base_parse_finish_frame (GstBaseParse * parse, GstBaseParseFrame * frame, gint size) { GstFlowReturn ret = GST_FLOW_OK; g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR); g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR); g_return_val_if_fail (size > 0 || frame->out_buffer, GST_FLOW_ERROR); g_return_val_if_fail (gst_adapter_available (parse->priv->adapter) >= size, GST_FLOW_ERROR); GST_LOG_OBJECT (parse, "finished frame at offset %" G_GUINT64_FORMAT ", " "flushing size %d", frame->offset, size); /* some one-time start-up */ if (G_UNLIKELY (parse->priv->framecount == 0)) { gst_base_parse_check_seekability (parse); gst_base_parse_check_upstream (parse); } parse->priv->flushed += size; if (parse->priv->scanning && frame->buffer) { if (!parse->priv->scanned_frame) { parse->priv->scanned_frame = gst_base_parse_frame_copy (frame); } goto exit; } /* either PUSH or PULL mode arranges for adapter data */ /* ensure output buffer */ if (!frame->out_buffer) { GstBuffer *src, *dest; frame->out_buffer = gst_adapter_take_buffer (parse->priv->adapter, size); dest = frame->out_buffer; src = frame->buffer; GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src); GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src); GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src); GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src); GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src); GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src); } else { gst_adapter_flush (parse->priv->adapter, size); } /* use as input for subsequent processing */ gst_buffer_replace (&frame->buffer, frame->out_buffer); gst_buffer_unref (frame->out_buffer); frame->out_buffer = NULL; /* mark input size consumed */ frame->size = size; /* subclass might queue frames/data internally if it needs more * frames to decide on the format, or might request us to queue here. */ if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_DROP) { gst_buffer_replace (&frame->buffer, NULL); goto exit; } else if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_QUEUE) { GstBaseParseFrame *copy; copy = gst_base_parse_frame_copy (frame); copy->flags &= ~GST_BASE_PARSE_FRAME_FLAG_QUEUE; gst_base_parse_queue_frame (parse, copy); goto exit; } ret = gst_base_parse_handle_and_push_frame (parse, frame); exit: return ret; } /* gst_base_parse_drain: * * Drains the adapter until it is empty. It decreases the min_frame_size to * match the current adapter size and calls chain method until the adapter * is emptied or chain returns with error. */ static void gst_base_parse_drain (GstBaseParse * parse) { guint avail; GST_DEBUG_OBJECT (parse, "draining"); parse->priv->drain = TRUE; for (;;) { avail = gst_adapter_available (parse->priv->adapter); if (!avail) break; if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse), NULL) != GST_FLOW_OK) { break; } /* nothing changed, maybe due to truncated frame; break infinite loop */ if (avail == gst_adapter_available (parse->priv->adapter)) { GST_DEBUG_OBJECT (parse, "no change during draining; flushing"); gst_adapter_clear (parse->priv->adapter); } } parse->priv->drain = FALSE; } /* gst_base_parse_send_buffers * * Sends buffers collected in send_buffers downstream, and ensures that list * is empty at the end (errors or not). */ static GstFlowReturn gst_base_parse_send_buffers (GstBaseParse * parse) { GSList *send = NULL; GstBuffer *buf; GstFlowReturn ret = GST_FLOW_OK; send = parse->priv->buffers_send; /* send buffers */ while (send) { buf = GST_BUFFER_CAST (send->data); GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT, buf, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)), GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf)); /* iterate output queue an push downstream */ ret = gst_pad_push (parse->srcpad, buf); send = g_slist_delete_link (send, send); /* clear any leftover if error */ if (G_UNLIKELY (ret != GST_FLOW_OK)) { while (send) { buf = GST_BUFFER_CAST (send->data); gst_buffer_unref (buf); send = g_slist_delete_link (send, send); } } } parse->priv->buffers_send = send; return ret; } /* gst_base_parse_start_fragment: * * Prepares for processing a reverse playback (forward) fragment * by (re)setting proper state variables. */ static GstFlowReturn gst_base_parse_start_fragment (GstBaseParse * parse) { GST_LOG_OBJECT (parse, "starting fragment"); /* invalidate so no fall-back timestamping is performed; * ok if taken from subclass or upstream */ parse->priv->next_ts = GST_CLOCK_TIME_NONE; parse->priv->prev_ts = GST_CLOCK_TIME_NONE; /* prevent it hanging around stop all the time */ parse->segment.position = GST_CLOCK_TIME_NONE; /* mark next run */ parse->priv->discont = TRUE; /* head of previous fragment is now pending tail of current fragment */ parse->priv->buffers_pending = parse->priv->buffers_head; parse->priv->buffers_head = NULL; return GST_FLOW_OK; } /* gst_base_parse_finish_fragment: * * Processes a reverse playback (forward) fragment: * - append head of last fragment that was skipped to current fragment data * - drain the resulting current fragment data (i.e. repeated chain) * - add time/duration (if needed) to frames queued by chain * - push queued data */ static GstFlowReturn gst_base_parse_finish_fragment (GstBaseParse * parse, gboolean prev_head) { GstBuffer *buf; GstFlowReturn ret = GST_FLOW_OK; gboolean seen_key = FALSE, seen_delta = FALSE; GST_LOG_OBJECT (parse, "finishing fragment"); /* restore order */ parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending); while (parse->priv->buffers_pending) { buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data); if (prev_head) { GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")", gst_buffer_get_size (buf)); gst_adapter_push (parse->priv->adapter, buf); } else { GST_LOG_OBJECT (parse, "discarding head buffer"); gst_buffer_unref (buf); } parse->priv->buffers_pending = g_slist_delete_link (parse->priv->buffers_pending, parse->priv->buffers_pending); } /* chain looks for frames and queues resulting ones (in stead of pushing) */ /* initial skipped data is added to buffers_pending */ gst_base_parse_drain (parse); if (parse->priv->buffers_send) { buf = GST_BUFFER_CAST (parse->priv->buffers_send->data); seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT); } /* add metadata (if needed to queued buffers */ GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT, GST_TIME_ARGS (parse->priv->last_ts)); while (parse->priv->buffers_queued) { buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data); /* no touching if upstream or parsing provided time */ if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) { GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf))); } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) && GST_BUFFER_DURATION_IS_VALID (buf)) { if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts)) parse->priv->last_ts -= GST_BUFFER_DURATION (buf); else parse->priv->last_ts = 0; GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts; GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf))); } else { /* no idea, very bad */ GST_WARNING_OBJECT (parse, "could not determine time for buffer"); } parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf); /* reverse order for ascending sending */ /* send downstream at keyframe not preceded by a keyframe * (e.g. that should identify start of collection of IDR nals) */ if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) { if (seen_key) { ret = gst_base_parse_send_buffers (parse); /* if a problem, throw all to sending */ if (ret != GST_FLOW_OK) { parse->priv->buffers_send = g_slist_reverse (parse->priv->buffers_queued); parse->priv->buffers_queued = NULL; break; } seen_key = FALSE; } seen_delta = TRUE; } else { seen_key = TRUE; } parse->priv->buffers_send = g_slist_prepend (parse->priv->buffers_send, buf); parse->priv->buffers_queued = g_slist_delete_link (parse->priv->buffers_queued, parse->priv->buffers_queued); } /* audio may have all marked as keyframe, so arrange to send here */ if (!seen_delta) ret = gst_base_parse_send_buffers (parse); /* any trailing unused no longer usable (ideally none) */ if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) { GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes", gst_adapter_available (parse->priv->adapter)); gst_adapter_clear (parse->priv->adapter); } return ret; } /* small helper that checks whether we have been trying to resync too long */ static inline GstFlowReturn gst_base_parse_check_sync (GstBaseParse * parse) { if (G_UNLIKELY (parse->priv->discont && parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) { GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("Failed to parse stream"), (NULL)); return GST_FLOW_ERROR; } return GST_FLOW_OK; } static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer) { GstBaseParseClass *bclass; GstBaseParse *parse; GstFlowReturn ret = GST_FLOW_OK; GstBuffer *tmpbuf = NULL; guint fsize = 1; gint skip = -1; const guint8 *data; guint min_size, av; GstClockTime timestamp; parse = GST_BASE_PARSE (parent); bclass = GST_BASE_PARSE_GET_CLASS (parse); if (parse->priv->detecting) { GstBuffer *detect_buf; if (parse->priv->detect_buffers_size == 0) { detect_buf = gst_buffer_ref (buffer); } else { GList *l; guint offset = 0; detect_buf = gst_buffer_new (); for (l = parse->priv->detect_buffers; l; l = l->next) { gsize tmpsize = gst_buffer_get_size (l->data); gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data), GST_BUFFER_COPY_MEMORY, offset, tmpsize); offset += tmpsize; } if (buffer) gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY, offset, gst_buffer_get_size (buffer)); } ret = bclass->detect (parse, detect_buf); gst_buffer_unref (detect_buf); if (ret == GST_FLOW_OK) { GList *l; /* Detected something */ parse->priv->detecting = FALSE; for (l = parse->priv->detect_buffers; l; l = l->next) { if (ret == GST_FLOW_OK && !parse->priv->flushing) ret = gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse), parent, GST_BUFFER_CAST (l->data)); else gst_buffer_unref (GST_BUFFER_CAST (l->data)); } g_list_free (parse->priv->detect_buffers); parse->priv->detect_buffers = NULL; parse->priv->detect_buffers_size = 0; if (ret != GST_FLOW_OK) { return ret; } /* Handle the current buffer */ } else if (ret == GST_FLOW_NOT_NEGOTIATED) { /* Still detecting, append buffer or error out if draining */ if (parse->priv->drain) { GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet"); return GST_FLOW_ERROR; } else if (parse->priv->flushing) { g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL); g_list_free (parse->priv->detect_buffers); parse->priv->detect_buffers = NULL; parse->priv->detect_buffers_size = 0; } else { parse->priv->detect_buffers = g_list_append (parse->priv->detect_buffers, buffer); parse->priv->detect_buffers_size += gst_buffer_get_size (buffer); return GST_FLOW_OK; } } else { /* Something went wrong, subclass responsible for error reporting */ return ret; } /* And now handle the current buffer if detection worked */ } if (G_LIKELY (buffer)) { GST_LOG_OBJECT (parse, "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT, gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer)); if (G_UNLIKELY (parse->priv->passthrough)) { GstBaseParseFrame frame; gst_base_parse_frame_init (&frame); frame.buffer = gst_buffer_make_writable (buffer); ret = gst_base_parse_push_frame (parse, &frame); gst_base_parse_frame_free (&frame); return ret; } /* upstream feeding us in reverse playback; * finish previous fragment and start new upon DISCONT */ if (parse->segment.rate < 0.0) { if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) { GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment"); ret = gst_base_parse_finish_fragment (parse, TRUE); gst_base_parse_start_fragment (parse); } } gst_adapter_push (parse->priv->adapter, buffer); } /* Parse and push as many frames as possible */ /* Stop either when adapter is empty or we are flushing */ while (!parse->priv->flushing) { gint flush = 0; /* note: if subclass indicates MAX fsize, * this will not likely be available anyway ... */ min_size = MAX (parse->priv->min_frame_size, fsize); av = gst_adapter_available (parse->priv->adapter); if (G_UNLIKELY (parse->priv->drain)) { min_size = av; GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size); if (G_UNLIKELY (!min_size)) { goto done; } } /* Collect at least min_frame_size bytes */ if (av < min_size) { GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)", av); goto done; } /* move along with upstream timestamp (if any), * but interpolate in between */ timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL); if (GST_CLOCK_TIME_IS_VALID (timestamp) && (parse->priv->prev_ts != timestamp)) { parse->priv->prev_ts = parse->priv->next_ts = timestamp; } /* always pass all available data */ data = gst_adapter_map (parse->priv->adapter, av); /* arrange for actual data to be copied if subclass tries to, * since what is passed is tied to the adapter */ tmpbuf = gst_buffer_new_wrapped_full (GST_MEMORY_FLAG_READONLY | GST_MEMORY_FLAG_NO_SHARE, (gpointer) data, av, 0, av, NULL, NULL); /* keep the adapter mapped, so keep track of what has to be flushed */ ret = gst_base_parse_handle_buffer (parse, tmpbuf, &skip, &flush); tmpbuf = NULL; /* probably already implicitly unmapped due to adapter operation, * but for good measure ... */ gst_adapter_unmap (parse->priv->adapter); if (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED) { goto done; } if (skip == 0 && flush == 0) { GST_LOG_OBJECT (parse, "nothing skipped and no frames finished, " "breaking to get more data"); goto done; } } done: GST_LOG_OBJECT (parse, "chain leaving"); return ret; } /* pull @size bytes at current offset, * i.e. at least try to and possibly return a shorter buffer if near the end */ static GstFlowReturn gst_base_parse_pull_range (GstBaseParse * parse, guint size, GstBuffer ** buffer) { GstFlowReturn ret = GST_FLOW_OK; g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR); /* Caching here actually makes much less difference than one would expect. * We do it mainly to avoid pulling buffers of 1 byte all the time */ if (parse->priv->cache) { gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache); gint cache_size = gst_buffer_get_size (parse->priv->cache); if (cache_offset <= parse->priv->offset && (parse->priv->offset + size) <= (cache_offset + cache_size)) { *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, parse->priv->offset - cache_offset, size); GST_BUFFER_OFFSET (*buffer) = parse->priv->offset; return GST_FLOW_OK; } /* not enough data in the cache, free cache and get a new one */ gst_buffer_unref (parse->priv->cache); parse->priv->cache = NULL; } /* refill the cache */ ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size, 64 * 1024), &parse->priv->cache); if (ret != GST_FLOW_OK) { parse->priv->cache = NULL; return ret; } if (gst_buffer_get_size (parse->priv->cache) >= size) { *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size); GST_BUFFER_OFFSET (*buffer) = parse->priv->offset; return GST_FLOW_OK; } /* Not possible to get enough data, try a last time with * requesting exactly the size we need */ gst_buffer_unref (parse->priv->cache); parse->priv->cache = NULL; ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size, &parse->priv->cache); if (ret != GST_FLOW_OK) { GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret); *buffer = NULL; return ret; } if (gst_buffer_get_size (parse->priv->cache) < size) { GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %" G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes", parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache)); *buffer = parse->priv->cache; parse->priv->cache = NULL; return GST_FLOW_OK; } *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size); GST_BUFFER_OFFSET (*buffer) = parse->priv->offset; return GST_FLOW_OK; } static GstFlowReturn gst_base_parse_handle_previous_fragment (GstBaseParse * parse) { gint64 offset = 0; GstClockTime ts = 0; GstBuffer *buffer; GstFlowReturn ret; GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts), parse->priv->last_offset); if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) { GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT, GST_TIME_ARGS (parse->segment.start)); ret = GST_FLOW_EOS; goto exit; } /* last fragment started at last_offset / last_ts; * seek back 10s capped at 1MB */ if (parse->priv->last_ts >= 10 * GST_SECOND) ts = parse->priv->last_ts - 10 * GST_SECOND; /* if we are exact now, we will be more so going backwards */ if (parse->priv->exact_position) { offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL); } else { if (!gst_base_parse_convert (parse, GST_FORMAT_TIME, ts, GST_FORMAT_BYTES, &offset)) { GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based"); } } offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024, parse->priv->last_offset - 1024); offset = MAX (0, offset); GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT, offset); parse->priv->offset = offset; ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset, &buffer); if (ret != GST_FLOW_OK) goto exit; /* offset will increase again as fragment is processed/parsed */ parse->priv->last_offset = offset; gst_base_parse_start_fragment (parse); gst_adapter_push (parse->priv->adapter, buffer); ret = gst_base_parse_finish_fragment (parse, TRUE); if (ret != GST_FLOW_OK) goto exit; /* force previous fragment */ parse->priv->offset = -1; exit: return ret; } /* PULL mode: * pull and scan for next frame starting from current offset * ajusts sync, drain and offset going along */ static GstFlowReturn gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass) { GstBuffer *buffer; GstFlowReturn ret = GST_FLOW_OK; guint fsize, min_size; gint flushed = 0; gint skip = 0; GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset); /* let's make this efficient for all subclass once and for all; * maybe it does not need this much, but in the latter case, we know we are * in pull mode here and might as well try to read and supply more anyway * (so does the buffer caching mechanism) */ fsize = 64 * 1024; while (TRUE) { min_size = MAX (parse->priv->min_frame_size, fsize); GST_LOG_OBJECT (parse, "reading buffer size %u", min_size); ret = gst_base_parse_pull_range (parse, min_size, &buffer); if (ret != GST_FLOW_OK) goto done; /* if we got a short read, inform subclass we are draining leftover * and no more is to be expected */ if (gst_buffer_get_size (buffer) < min_size) { GST_LOG_OBJECT (parse, "... but did not get that; marked draining"); parse->priv->drain = TRUE; } if (parse->priv->detecting) { ret = klass->detect (parse, buffer); if (ret == GST_FLOW_NOT_NEGOTIATED) { /* If draining we error out, otherwise request a buffer * with 64kb more */ if (parse->priv->drain) { gst_buffer_unref (buffer); GST_ERROR_OBJECT (parse, "Failed to detect format but draining"); return GST_FLOW_ERROR; } else { fsize += 64 * 1024; gst_buffer_unref (buffer); continue; } } else if (ret != GST_FLOW_OK) { gst_buffer_unref (buffer); GST_ERROR_OBJECT (parse, "detect() returned %s", gst_flow_get_name (ret)); return ret; } /* Else handle this buffer normally */ } ret = gst_base_parse_handle_buffer (parse, buffer, &skip, &flushed); if (ret != GST_FLOW_OK) break; /* something flushed means something happened, * and we should bail out of this loop so as not to occupy * the task thread indefinitely */ if (flushed) { GST_LOG_OBJECT (parse, "frame finished, breaking loop"); break; } /* nothing flushed, no skip and draining, so nothing left to do */ if (!skip && parse->priv->drain) { GST_LOG_OBJECT (parse, "no activity or result when draining; " "breaking loop and marking EOS"); ret = GST_FLOW_EOS; break; } /* otherwise, get some more data * note that is checked this does not happen indefinitely */ if (!skip) { GST_LOG_OBJECT (parse, "getting some more data"); fsize += 64 * 1024; } parse->priv->drain = FALSE; } done: return ret; } /* Loop that is used in pull mode to retrieve data from upstream */ static void gst_base_parse_loop (GstPad * pad) { GstBaseParse *parse; GstBaseParseClass *klass; GstFlowReturn ret = GST_FLOW_OK; parse = GST_BASE_PARSE (gst_pad_get_parent (pad)); klass = GST_BASE_PARSE_GET_CLASS (parse); GST_DEBUG_OBJECT (parse, "hello"); if (G_UNLIKELY (parse->priv->push_stream_start)) { gchar *stream_id; stream_id = gst_pad_create_stream_id (parse->srcpad, GST_ELEMENT_CAST (parse), NULL); GST_DEBUG_OBJECT (parse, "Pushing STREAM_START"); gst_pad_push_event (parse->srcpad, gst_event_new_stream_start (stream_id)); parse->priv->push_stream_start = FALSE; g_free (stream_id); } /* reverse playback: * first fragment (closest to stop time) is handled normally below, * then we pull in fragments going backwards */ if (parse->segment.rate < 0.0) { /* check if we jumped back to a previous fragment, * which is a post-first fragment */ if (parse->priv->offset < 0) { ret = gst_base_parse_handle_previous_fragment (parse); goto done; } } ret = gst_base_parse_scan_frame (parse, klass); if (ret != GST_FLOW_OK) goto done; /* eat expected eos signalling past segment in reverse playback */ if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS && parse->segment.position >= parse->segment.stop) { GST_DEBUG_OBJECT (parse, "downstream has reached end of segment"); /* push what was accumulated during loop run */ gst_base_parse_finish_fragment (parse, FALSE); /* force previous fragment */ parse->priv->offset = -1; ret = GST_FLOW_OK; } done: if (ret == GST_FLOW_EOS) goto eos; else if (ret != GST_FLOW_OK) goto pause; gst_object_unref (parse); return; /* ERRORS */ eos: { ret = GST_FLOW_EOS; GST_DEBUG_OBJECT (parse, "eos"); /* fall-through */ } pause: { gboolean push_eos = FALSE; GST_DEBUG_OBJECT (parse, "pausing task, reason %s", gst_flow_get_name (ret)); gst_pad_pause_task (parse->sinkpad); if (ret == GST_FLOW_EOS) { /* handle end-of-stream/segment */ if (parse->segment.flags & GST_SEGMENT_FLAG_SEGMENT) { gint64 stop; if ((stop = parse->segment.stop) == -1) stop = parse->segment.duration; GST_DEBUG_OBJECT (parse, "sending segment_done"); gst_element_post_message (GST_ELEMENT_CAST (parse), gst_message_new_segment_done (GST_OBJECT_CAST (parse), GST_FORMAT_TIME, stop)); gst_pad_push_event (parse->srcpad, gst_event_new_segment_done (GST_FORMAT_TIME, stop)); } else { /* If we STILL have zero frames processed, fire an error */ if (parse->priv->framecount == 0) { GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE, ("No valid frames found before end of stream"), (NULL)); } push_eos = TRUE; } } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) { /* for fatal errors we post an error message, wrong-state is * not fatal because it happens due to flushes and only means * that we should stop now. */ GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL), ("streaming stopped, reason %s", gst_flow_get_name (ret))); push_eos = TRUE; } if (push_eos) { /* Push pending events, including NEWSEGMENT events */ if (G_UNLIKELY (parse->priv->pending_events)) { GList *l; for (l = parse->priv->pending_events; l != NULL; l = l->next) { gst_pad_push_event (parse->srcpad, GST_EVENT (l->data)); } g_list_free (parse->priv->pending_events); parse->priv->pending_events = NULL; parse->priv->pending_segment = FALSE; } gst_pad_push_event (parse->srcpad, gst_event_new_eos ()); } gst_object_unref (parse); } } static gboolean gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent) { GstBaseParse *parse; GstQuery *query; gboolean pull_mode; parse = GST_BASE_PARSE (parent); GST_DEBUG_OBJECT (parse, "sink activate"); query = gst_query_new_scheduling (); if (!gst_pad_peer_query (sinkpad, query)) { gst_query_unref (query); goto baseparse_push; } pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL); gst_query_unref (query); if (!pull_mode) goto baseparse_push; GST_DEBUG_OBJECT (parse, "trying to activate in pull mode"); if (!gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE)) goto baseparse_push; parse->priv->push_stream_start = TRUE; return gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop, sinkpad, NULL); /* fallback */ baseparse_push: { GST_DEBUG_OBJECT (parse, "trying to activate in push mode"); return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE); } } static gboolean gst_base_parse_activate (GstBaseParse * parse, gboolean active) { GstBaseParseClass *klass; gboolean result = TRUE; GST_DEBUG_OBJECT (parse, "activate %d", active); klass = GST_BASE_PARSE_GET_CLASS (parse); if (active) { if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start) result = klass->start (parse); /* If the subclass implements ::detect we want to * call it for the first buffers now */ parse->priv->detecting = (klass->detect != NULL); } else { /* We must make sure streaming has finished before resetting things * and calling the ::stop vfunc */ GST_PAD_STREAM_LOCK (parse->sinkpad); GST_PAD_STREAM_UNLOCK (parse->sinkpad); if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop) result = klass->stop (parse); parse->priv->pad_mode = GST_PAD_MODE_NONE; } GST_DEBUG_OBJECT (parse, "activate return: %d", result); return result; } static gboolean gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent, GstPadMode mode, gboolean active) { gboolean result; GstBaseParse *parse; parse = GST_BASE_PARSE (parent); GST_DEBUG_OBJECT (parse, "sink activate mode %d, %d", mode, active); if (!gst_base_parse_activate (parse, active)) goto activate_failed; switch (mode) { case GST_PAD_MODE_PULL: if (active) { parse->priv->pending_events = g_list_append (parse->priv->pending_events, gst_event_new_segment (&parse->segment)); parse->priv->pending_segment = TRUE; result = TRUE; } else { result = gst_pad_stop_task (pad); } break; default: result = TRUE; break; } if (result) parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE; GST_DEBUG_OBJECT (parse, "sink activate return: %d", result); return result; /* ERRORS */ activate_failed: { GST_DEBUG_OBJECT (parse, "activate failed"); return FALSE; } } /** * gst_base_parse_set_duration: * @parse: #GstBaseParse. * @fmt: #GstFormat. * @duration: duration value. * @interval: how often to update the duration estimate based on bitrate, or 0. * * Sets the duration of the currently playing media. Subclass can use this * when it is able to determine duration and/or notices a change in the media * duration. Alternatively, if @interval is non-zero (default), then stream * duration is determined based on estimated bitrate, and updated every @interval * frames. */ void gst_base_parse_set_duration (GstBaseParse * parse, GstFormat fmt, gint64 duration, gint interval) { g_return_if_fail (parse != NULL); if (parse->priv->upstream_has_duration) { GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update"); goto exit; } if (duration != parse->priv->duration) { GstMessage *m; m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration); gst_element_post_message (GST_ELEMENT (parse), m); /* TODO: what about duration tag? */ } parse->priv->duration = duration; parse->priv->duration_fmt = fmt; GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration); if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) { if (interval != 0) { GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate"); interval = 0; } } GST_DEBUG_OBJECT (parse, "set update interval: %d", interval); parse->priv->update_interval = interval; exit: return; } /** * gst_base_parse_set_average_bitrate: * @parse: #GstBaseParse. * @bitrate: average bitrate in bits/second * * Optionally sets the average bitrate detected in media (if non-zero), * e.g. based on metadata, as it will be posted to the application. * * By default, announced average bitrate is estimated. The average bitrate * is used to estimate the total duration of the stream and to estimate * a seek position, if there's no index and the format is syncable * (see gst_base_parse_set_syncable()). */ void gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate) { parse->priv->bitrate = bitrate; GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate); } /** * gst_base_parse_set_min_frame_size: * @parse: #GstBaseParse. * @min_size: Minimum size of the data that this base class should give to * subclass. * * Subclass can use this function to tell the base class that it needs to * give at least #min_size buffers. */ void gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size) { g_return_if_fail (parse != NULL); parse->priv->min_frame_size = min_size; GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size); } /** * gst_base_parse_set_frame_rate: * @parse: the #GstBaseParse to set * @fps_num: frames per second (numerator). * @fps_den: frames per second (denominator). * @lead_in: frames needed before a segment for subsequent decode * @lead_out: frames needed after a segment * * If frames per second is configured, parser can take care of buffer duration * and timestamping. When performing segment clipping, or seeking to a specific * location, a corresponding decoder might need an initial @lead_in and a * following @lead_out number of frames to ensure the desired segment is * entirely filled upon decoding. */ void gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num, guint fps_den, guint lead_in, guint lead_out) { g_return_if_fail (parse != NULL); parse->priv->fps_num = fps_num; parse->priv->fps_den = fps_den; if (!fps_num || !fps_den) { GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters", fps_num, fps_den); fps_num = fps_den = 0; parse->priv->frame_duration = GST_CLOCK_TIME_NONE; parse->priv->lead_in = parse->priv->lead_out = 0; parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0; } else { parse->priv->frame_duration = gst_util_uint64_scale (GST_SECOND, fps_den, fps_num); parse->priv->lead_in = lead_in; parse->priv->lead_out = lead_out; parse->priv->lead_in_ts = gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num); parse->priv->lead_out_ts = gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num); /* aim for about 1.5s to estimate duration */ if (parse->priv->update_interval < 0) { parse->priv->update_interval = fps_num * 3 / (fps_den * 2); GST_LOG_OBJECT (parse, "estimated update interval to %d frames", parse->priv->update_interval); } } GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms", fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND); GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, " "lead out: %d frames = %" G_GUINT64_FORMAT " ms", lead_in, parse->priv->lead_in_ts / GST_MSECOND, lead_out, parse->priv->lead_out_ts / GST_MSECOND); } /** * gst_base_parse_set_has_timing_info: * @parse: a #GstBaseParse * @has_timing: whether frames carry timing information * * Set if frames carry timing information which the subclass can (generally) * parse and provide. In particular, intrinsic (rather than estimated) time * can be obtained following a seek. */ void gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing) { parse->priv->has_timing_info = has_timing; GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no"); } /** * gst_base_parse_set_syncable: * @parse: a #GstBaseParse * @syncable: set if frame starts can be identified * * Set if frame starts can be identified. This is set by default and * determines whether seeking based on bitrate averages * is possible for a format/stream. */ void gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable) { parse->priv->syncable = syncable; GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no"); } /** * gst_base_parse_set_passthrough: * @parse: a #GstBaseParse * @passthrough: %TRUE if parser should run in passthrough mode * * Set if the nature of the format or configuration does not allow (much) * parsing, and the parser should operate in passthrough mode (which only * applies when operating in push mode). That is, incoming buffers are * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame * callbacks will be invoked, but @pre_push_frame will still be invoked, * so subclass can perform as much or as little is appropriate for * passthrough semantics in @pre_push_frame. */ void gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough) { parse->priv->passthrough = passthrough; GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no"); } /** * gst_base_parse_set_latency: * @parse: a #GstBaseParse * @min_latency: minimum parse latency * @max_latency: maximum parse latency * * Sets the minimum and maximum (which may likely be equal) latency introduced * by the parsing process. If there is such a latency, which depends on the * particular parsing of the format, it typically corresponds to 1 frame duration. */ void gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency, GstClockTime max_latency) { GST_OBJECT_LOCK (parse); parse->priv->min_latency = min_latency; parse->priv->max_latency = max_latency; GST_OBJECT_UNLOCK (parse); GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %" GST_TIME_FORMAT, GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency)); } static gboolean gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format, GstClockTime * duration) { gboolean res = FALSE; g_return_val_if_fail (duration != NULL, FALSE); *duration = GST_CLOCK_TIME_NONE; if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) { GST_LOG_OBJECT (parse, "using provided duration"); *duration = parse->priv->duration; res = TRUE; } else if (parse->priv->duration != -1) { GST_LOG_OBJECT (parse, "converting provided duration"); res = gst_base_parse_convert (parse, parse->priv->duration_fmt, parse->priv->duration, format, (gint64 *) duration); } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) { GST_LOG_OBJECT (parse, "using estimated duration"); *duration = parse->priv->estimated_duration; res = TRUE; } else { GST_LOG_OBJECT (parse, "cannot estimate duration"); } GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res, GST_TIME_ARGS (*duration)); return res; } static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query) { GstBaseParse *parse; gboolean res = FALSE; parse = GST_BASE_PARSE (parent); GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_POSITION: { gint64 dest_value; GstFormat format; GST_DEBUG_OBJECT (parse, "position query"); gst_query_parse_position (query, &format, NULL); /* try upstream first */ res = gst_pad_query_default (pad, parent, query); if (!res) { /* Fall back on interpreting segment */ GST_OBJECT_LOCK (parse); if (format == GST_FORMAT_BYTES) { dest_value = parse->priv->offset; res = TRUE; } else if (format == parse->segment.format && GST_CLOCK_TIME_IS_VALID (parse->segment.position)) { dest_value = gst_segment_to_stream_time (&parse->segment, parse->segment.format, parse->segment.position); res = TRUE; } GST_OBJECT_UNLOCK (parse); if (!res) { /* no precise result, upstream no idea either, then best estimate */ /* priv->offset is updated in both PUSH/PULL modes */ res = gst_base_parse_convert (parse, GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value); } if (res) gst_query_set_position (query, format, dest_value); } break; } case GST_QUERY_DURATION: { GstFormat format; GstClockTime duration; GST_DEBUG_OBJECT (parse, "duration query"); gst_query_parse_duration (query, &format, NULL); /* consult upstream */ res = gst_pad_query_default (pad, parent, query); /* otherwise best estimate from us */ if (!res) { res = gst_base_parse_get_duration (parse, format, &duration); if (res) gst_query_set_duration (query, format, duration); } break; } case GST_QUERY_SEEKING: { GstFormat fmt; GstClockTime duration = GST_CLOCK_TIME_NONE; gboolean seekable = FALSE; GST_DEBUG_OBJECT (parse, "seeking query"); gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL); /* consult upstream */ res = gst_pad_query_default (pad, parent, query); /* we may be able to help if in TIME */ if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) { gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL); /* already OK if upstream takes care */ GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d", res, seekable); if (!(res && seekable)) { if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration) || duration == -1) { /* seekable if we still have a chance to get duration later on */ seekable = parse->priv->upstream_seekable && parse->priv->update_interval; } else { seekable = parse->priv->upstream_seekable; GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d", seekable); } gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration); res = TRUE; } } break; } case GST_QUERY_FORMATS: gst_query_set_formatsv (query, 3, fmtlist); res = TRUE; break; case GST_QUERY_CONVERT: { GstFormat src_format, dest_format; gint64 src_value, dest_value; gst_query_parse_convert (query, &src_format, &src_value, &dest_format, &dest_value); res = gst_base_parse_convert (parse, src_format, src_value, dest_format, &dest_value); if (res) { gst_query_set_convert (query, src_format, src_value, dest_format, dest_value); } break; } case GST_QUERY_LATENCY: { if ((res = gst_pad_peer_query (parse->sinkpad, query))) { gboolean live; GstClockTime min_latency, max_latency; gst_query_parse_latency (query, &live, &min_latency, &max_latency); GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %" GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live, GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency)); GST_OBJECT_LOCK (parse); /* add our latency */ if (min_latency != -1) min_latency += parse->priv->min_latency; if (max_latency != -1) max_latency += parse->priv->max_latency; GST_OBJECT_UNLOCK (parse); gst_query_set_latency (query, live, min_latency, max_latency); } break; } default: res = gst_pad_query_default (pad, parent, query); break; } return res; } /* scans for a cluster start from @pos, * return GST_FLOW_OK and frame position/time in @pos/@time if found */ static GstFlowReturn gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos, GstClockTime * time, GstClockTime * duration) { GstBaseParseClass *klass; gint64 orig_offset; gboolean orig_drain, orig_discont; GstFlowReturn ret = GST_FLOW_OK; GstBuffer *buf = NULL; GstBaseParseFrame *sframe = NULL; g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR); g_return_val_if_fail (time != NULL, GST_FLOW_ERROR); g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR); klass = GST_BASE_PARSE_GET_CLASS (parse); *time = GST_CLOCK_TIME_NONE; *duration = GST_CLOCK_TIME_NONE; /* save state */ orig_offset = parse->priv->offset; orig_discont = parse->priv->discont; orig_drain = parse->priv->drain; GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT " (%#" G_GINT64_MODIFIER "x)", *pos, *pos); /* jump elsewhere and locate next frame */ parse->priv->offset = *pos; /* mark as scanning so frames don't get processed all the way */ parse->priv->scanning = TRUE; ret = gst_base_parse_scan_frame (parse, klass); parse->priv->scanning = FALSE; /* retrieve frame found during scan */ sframe = parse->priv->scanned_frame; parse->priv->scanned_frame = NULL; if (ret != GST_FLOW_OK || !sframe) goto done; /* get offset first, subclass parsing might dump other stuff in there */ *pos = sframe->offset; buf = sframe->buffer; g_assert (buf); /* but it should provide proper time */ *time = GST_BUFFER_TIMESTAMP (buf); *duration = GST_BUFFER_DURATION (buf); GST_LOG_OBJECT (parse, "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT, GST_TIME_ARGS (*time), *pos); done: if (sframe) gst_base_parse_frame_free (sframe); /* restore state */ parse->priv->offset = orig_offset; parse->priv->discont = orig_discont; parse->priv->drain = orig_drain; return ret; } /* bisect and scan through file for frame starting before @time, * returns OK and @time/@offset if found, NONE and/or error otherwise * If @time == G_MAXINT64, scan for duration ( == last frame) */ static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time, gint64 * _offset) { GstFlowReturn ret = GST_FLOW_OK; gint64 lpos, hpos, newpos; GstClockTime time, ltime, htime, newtime, dur; gboolean cont = TRUE; const GstClockTime tolerance = TARGET_DIFFERENCE; const guint chunk = 4 * 1024; g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR); g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR); GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT, GST_TIME_ARGS (*_time)); /* TODO also make keyframe aware if useful some day */ time = *_time; /* basic cases */ if (time == 0) { *_offset = 0; return GST_FLOW_OK; } if (time == -1) { *_offset = -1; return GST_FLOW_OK; } /* do not know at first */ *_offset = -1; *_time = GST_CLOCK_TIME_NONE; /* need initial positions; start and end */ lpos = parse->priv->first_frame_offset; ltime = parse->priv->first_frame_ts; if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) { GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect"); return GST_FLOW_ERROR; } hpos = parse->priv->upstream_size; GST_DEBUG_OBJECT (parse, "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, htime, GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime)); /* check preconditions are satisfied; * start and end are needed, except for special case where we scan for * last frame to determine duration */ if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos || !GST_CLOCK_TIME_IS_VALID (ltime) || (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) { return GST_FLOW_OK; } /* shortcut cases */ if (time < ltime) { goto exit; } else if (time < ltime + tolerance) { *_offset = lpos; *_time = ltime; goto exit; } else if (time >= htime) { *_offset = hpos; *_time = htime; goto exit; } while (htime > ltime && cont) { GST_LOG_OBJECT (parse, "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos, GST_TIME_ARGS (ltime)); GST_LOG_OBJECT (parse, "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos, GST_TIME_ARGS (htime)); if (G_UNLIKELY (time == G_MAXINT64)) { newpos = hpos; } else if (G_LIKELY (hpos > lpos)) { newpos = gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) + lpos - chunk; } else { /* should mean lpos == hpos, since lpos <= hpos is invariant */ newpos = lpos; /* we check this case once, but not forever, so break loop */ cont = FALSE; } /* ensure */ newpos = CLAMP (newpos, lpos, hpos); GST_LOG_OBJECT (parse, "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT, GST_TIME_ARGS (time), newpos); ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur); if (ret == GST_FLOW_EOS) { /* heuristic HACK */ hpos = MAX (lpos, hpos - chunk); continue; } else if (ret != GST_FLOW_OK) { goto exit; } if (newtime == -1 || newpos == -1) { GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting"); break; } if (G_UNLIKELY (time == G_MAXINT64)) { *_offset = newpos; *_time = newtime; if (GST_CLOCK_TIME_IS_VALID (dur)) *_time += dur; break; } else if (newtime > time) { /* overshoot */ hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos); htime = newtime; } else if (newtime + tolerance > time) { /* close enough undershoot */ *_offset = newpos; *_time = newtime; break; } else if (newtime < ltime) { /* so a position beyond lpos resulted in earlier time than ltime ... */ GST_DEBUG_OBJECT (parse, "non-ascending time; aborting"); break; } else { /* undershoot too far */ newpos += newpos == lpos ? chunk : 0; lpos = CLAMP (newpos, lpos, hpos); ltime = newtime; } } exit: GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %" GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time)); return ret; } static gint64 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time, gboolean before, GstClockTime * _ts) { gint64 bytes = 0, ts = 0; GstIndexEntry *entry = NULL; if (time == GST_CLOCK_TIME_NONE) { ts = time; bytes = -1; goto exit; } GST_BASE_PARSE_INDEX_LOCK (parse); if (parse->priv->index) { /* Let's check if we have an index entry for that time */ entry = gst_index_get_assoc_entry (parse->priv->index, parse->priv->index_id, before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER, GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time); } if (entry) { gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes); gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts); GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT, GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes); } else { GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT, GST_TIME_ARGS (time)); if (!before) { bytes = -1; ts = GST_CLOCK_TIME_NONE; } } GST_BASE_PARSE_INDEX_UNLOCK (parse); exit: if (_ts) *_ts = ts; return bytes; } /* returns TRUE if seek succeeded */ static gboolean gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event) { gdouble rate; GstFormat format; GstSeekFlags flags; GstSeekType start_type = GST_SEEK_TYPE_NONE, stop_type; gboolean flush, update, res = TRUE, accurate; gint64 start, stop, seekpos, seekstop; GstSegment seeksegment = { 0, }; GstClockTime start_ts; /* try upstream first, unless we're driving the streaming thread ourselves */ if (parse->priv->pad_mode != GST_PAD_MODE_PULL) { res = gst_pad_push_event (parse->sinkpad, gst_event_ref (event)); if (res) goto done; } gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start, &stop_type, &stop); GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, " "start type %d at %" GST_TIME_FORMAT ", end type %d at %" GST_TIME_FORMAT, gst_format_get_name (format), rate, start_type, GST_TIME_ARGS (start), stop_type, GST_TIME_ARGS (stop)); /* we can only handle TIME */ if (format != GST_FORMAT_TIME) goto done; /* no negative rates in push mode (unless upstream takes care of that, but * we've already tried upstream and it didn't handle the seek request) */ if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH) goto negative_rate; if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PULL) goto negative_rate_pull_mode; if (start_type != GST_SEEK_TYPE_SET || (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE)) goto wrong_type; /* get flush flag */ flush = flags & GST_SEEK_FLAG_FLUSH; /* copy segment, we need this because we still need the old * segment when we close the current segment. */ gst_segment_copy_into (&parse->segment, &seeksegment); GST_DEBUG_OBJECT (parse, "configuring seek"); gst_segment_do_seek (&seeksegment, rate, format, flags, start_type, start, stop_type, stop, &update); /* accurate seeking implies seek tables are used to obtain position, * and the requested segment is maintained exactly, not adjusted any way */ accurate = flags & GST_SEEK_FLAG_ACCURATE; /* maybe we can be accurate for (almost) free */ gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts); if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) { GST_DEBUG_OBJECT (parse, "accurate seek possible"); accurate = TRUE; } if (accurate) { GstClockTime startpos = seeksegment.position; /* accurate requested, so ... seek a bit before target */ if (startpos < parse->priv->lead_in_ts) startpos = 0; else startpos -= parse->priv->lead_in_ts; seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts); seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE, NULL); } else { start_ts = seeksegment.position; if (!gst_base_parse_convert (parse, format, seeksegment.position, GST_FORMAT_BYTES, &seekpos)) goto convert_failed; if (!gst_base_parse_convert (parse, format, seeksegment.stop, GST_FORMAT_BYTES, &seekstop)) goto convert_failed; } GST_DEBUG_OBJECT (parse, "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT, start_ts, seekpos); GST_DEBUG_OBJECT (parse, "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT, seeksegment.stop, seekstop); if (parse->priv->pad_mode == GST_PAD_MODE_PULL) { gint64 last_stop; GST_DEBUG_OBJECT (parse, "seek in PULL mode"); if (flush) { if (parse->srcpad) { GST_DEBUG_OBJECT (parse, "sending flush start"); gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ()); /* unlock upstream pull_range */ gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ()); } } else { gst_pad_pause_task (parse->sinkpad); } /* we should now be able to grab the streaming thread because we stopped it * with the above flush/pause code */ GST_PAD_STREAM_LOCK (parse->sinkpad); /* save current position */ last_stop = parse->segment.position; GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT, last_stop); /* now commit to new position */ /* prepare for streaming again */ if (flush) { GST_DEBUG_OBJECT (parse, "sending flush stop"); gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop (TRUE)); gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop (TRUE)); gst_base_parse_clear_queues (parse); } else { /* keep track of our position */ seeksegment.base = gst_segment_to_running_time (&seeksegment, seeksegment.format, parse->segment.position); } memcpy (&parse->segment, &seeksegment, sizeof (GstSegment)); /* store the newsegment event so it can be sent from the streaming thread. */ /* This will be sent later in _loop() */ parse->priv->pending_segment = TRUE; parse->priv->pending_events = g_list_append (parse->priv->pending_events, gst_event_new_segment (&parse->segment)); GST_DEBUG_OBJECT (parse, "Created newseg format %d, " "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT ", pos = %" GST_TIME_FORMAT, format, GST_TIME_ARGS (parse->segment.start), GST_TIME_ARGS (parse->segment.stop), GST_TIME_ARGS (parse->segment.start)); /* one last chance in pull mode to stay accurate; * maybe scan and subclass can find where to go */ if (!accurate) { gint64 scanpos; GstClockTime ts = seeksegment.position; gst_base_parse_locate_time (parse, &ts, &scanpos); if (scanpos >= 0) { accurate = TRUE; seekpos = scanpos; /* running collected index now consists of several intervals, * so optimized check no longer possible */ parse->priv->index_last_valid = FALSE; parse->priv->index_last_offset = 0; parse->priv->index_last_ts = 0; } } /* mark discont if we are going to stream from another position. */ if (seekpos != parse->priv->offset) { GST_DEBUG_OBJECT (parse, "mark DISCONT, we did a seek to another position"); parse->priv->offset = seekpos; parse->priv->last_offset = seekpos; parse->priv->seen_keyframe = FALSE; parse->priv->discont = TRUE; parse->priv->next_ts = start_ts; parse->priv->last_ts = GST_CLOCK_TIME_NONE; parse->priv->sync_offset = seekpos; parse->priv->exact_position = accurate; } /* Start streaming thread if paused */ gst_pad_start_task (parse->sinkpad, (GstTaskFunction) gst_base_parse_loop, parse->sinkpad, NULL); GST_PAD_STREAM_UNLOCK (parse->sinkpad); /* handled seek */ res = TRUE; } else { GstEvent *new_event; GstBaseParseSeek *seek; GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE); /* The only thing we need to do in PUSH-mode is to send the seek event (in bytes) to upstream. Segment / flush handling happens in corresponding src event handlers */ GST_DEBUG_OBJECT (parse, "seek in PUSH mode"); if (seekstop >= 0 && seekstop <= seekpos) seekstop = seekpos; new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags, GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop); /* store segment info so its precise details can be reconstructed when * receiving newsegment; * this matters for all details when accurate seeking, * is most useful to preserve NONE stop time otherwise */ seek = g_new0 (GstBaseParseSeek, 1); seek->segment = seeksegment; seek->accurate = accurate; seek->offset = seekpos; seek->start_ts = start_ts; GST_OBJECT_LOCK (parse); /* less optimal, but preserves order */ parse->priv->pending_seeks = g_slist_append (parse->priv->pending_seeks, seek); GST_OBJECT_UNLOCK (parse); res = gst_pad_push_event (parse->sinkpad, new_event); if (!res) { GST_OBJECT_LOCK (parse); parse->priv->pending_seeks = g_slist_remove (parse->priv->pending_seeks, seek); GST_OBJECT_UNLOCK (parse); g_free (seek); } } done: gst_event_unref (event); return res; /* ERRORS */ negative_rate_pull_mode: { GST_FIXME_OBJECT (parse, "negative playback in pull mode needs fixing"); res = FALSE; goto done; } negative_rate: { GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream."); res = FALSE; goto done; } wrong_type: { GST_DEBUG_OBJECT (parse, "unsupported seek type."); res = FALSE; goto done; } convert_failed: { GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed."); res = FALSE; goto done; } } /* Checks if bitrates are available from upstream tags so that we don't * override them later */ static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event) { GstTagList *taglist = NULL; guint tmp; gst_event_parse_tag (event, &taglist); /* We only care about stream tags here */ if (gst_tag_list_get_scope (taglist) != GST_TAG_SCOPE_STREAM) return; if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) { GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp); parse->priv->post_min_bitrate = FALSE; } if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) { GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp); parse->priv->post_avg_bitrate = FALSE; } if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) { GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp); parse->priv->post_max_bitrate = FALSE; } } #if 0 static void gst_base_parse_set_index (GstElement * element, GstIndex * index) { GstBaseParse *parse = GST_BASE_PARSE (element); GST_BASE_PARSE_INDEX_LOCK (parse); if (parse->priv->index) gst_object_unref (parse->priv->index); if (index) { parse->priv->index = gst_object_ref (index); gst_index_get_writer_id (index, GST_OBJECT_CAST (element), &parse->priv->index_id); parse->priv->own_index = FALSE; } else { parse->priv->index = NULL; } GST_BASE_PARSE_INDEX_UNLOCK (parse); } static GstIndex * gst_base_parse_get_index (GstElement * element) { GstBaseParse *parse = GST_BASE_PARSE (element); GstIndex *result = NULL; GST_BASE_PARSE_INDEX_LOCK (parse); if (parse->priv->index) result = gst_object_ref (parse->priv->index); GST_BASE_PARSE_INDEX_UNLOCK (parse); return result; } #endif static GstStateChangeReturn gst_base_parse_change_state (GstElement * element, GstStateChange transition) { GstBaseParse *parse; GstStateChangeReturn result; parse = GST_BASE_PARSE (element); switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: /* If this is our own index destroy it as the * old entries might be wrong for the new stream */ GST_BASE_PARSE_INDEX_LOCK (parse); if (parse->priv->own_index) { gst_object_unref (parse->priv->index); parse->priv->index = NULL; parse->priv->own_index = FALSE; } /* If no index was created, generate one */ if (G_UNLIKELY (!parse->priv->index)) { GST_DEBUG_OBJECT (parse, "no index provided creating our own"); parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL); gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse), &parse->priv->index_id); parse->priv->own_index = TRUE; } GST_BASE_PARSE_INDEX_UNLOCK (parse); break; default: break; } result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: gst_base_parse_reset (parse); break; default: break; } return result; }