/* GStreamer * Copyright (C) 2008 Nokia Corporation. All rights reserved. * Contact: Stefan Kost * Copyright (C) 2008 Sebastian Dröge . * * 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: * * One sinkpad and one srcpad * Handles state changes * Does flushing * Push mode * Pull mode * Handles events (NEWSEGMENT/EOS/FLUSH) * Handles seeking in both modes * * Handles POSITION/DURATION/SEEKING/FORMAT/CONVERT queries * * * * The purpose of this base class is to provide a basic functionality of * a parser and share a lot of rather complex code. * * Description of the parsing mechanism: * * * Set-up phase * * GstBaseParse class calls @set_sink_caps to inform the subclass about * incoming sinkpad caps. Subclass should set the srcpad caps accordingly. * * * GstBaseParse calls @start to inform subclass that data processing is * about to start now. * * * At least in 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 into internal * #GstAdapter. * * * A buffer of min_frame_size bytes is passed to subclass with * @check_valid_frame. Subclass checks the contents and returns TRUE * if the buffer contains a valid frame. It also needs to set the * @framesize according to the detected frame size. If buffer didn't * contain a valid frame, this call must return FALSE and optionally * set the @skipsize value to inform base class that how many bytes * it needs to skip in order to find a valid frame. The passed buffer * is read-only. Note that @check_valid_frame might receive any small * amount of input data when leftover data is being drained (e.g. at EOS). * * * After valid frame is found, it will be passed again to subclass with * @parse_frame call. Now subclass is responsible for parsing the * frame contents and setting the caps, buffer timestamp and duration * (although the latter can also be done by GstBaseParse if it is * appropriately configured, see below). * * * Finally the buffer can be pushed downstream and parsing loop starts * over again. Just prior to actually pushing the buffer in question, * it is passed to @pre_push_buffer 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 @check_valid_frame * and tell if they contain a valid frame * * * Set the caps and timestamp to frame that is passed to subclass with * @parse_frame function. * * 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_seek and * @gst_base_parse_set_frame_props. * * * 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 "gstbaseparse.h" #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 GstFormat fmtlist[] = { GST_FORMAT_DEFAULT, GST_FORMAT_BYTES, GST_FORMAT_TIME, 0 }; #define GST_BASE_PARSE_GET_PRIVATE(obj) \ (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate)) struct _GstBaseParsePrivate { GstActivateMode pad_mode; gint64 duration; GstFormat duration_fmt; gint64 estimated_duration; guint min_frame_size; gboolean passthrough; guint fps_num, fps_den; guint update_interval; guint bitrate; guint lead_in, lead_out; GstClockTime lead_in_ts, lead_out_ts; GstBaseParseSeekable seekable; gboolean discont; gboolean flushing; gboolean drain; gint64 offset; gint64 sync_offset; GstClockTime next_ts; GstClockTime prev_ts; GstClockTime frame_duration; 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; GList *pending_events; GstBuffer *cache; /* index entry storage, either ours or provided */ GstIndex *index; gint index_id; gboolean own_index; /* 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; guint64 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_queued; GstClockTime last_ts; gint64 last_offset; }; typedef struct _GstBaseParseSeek { GstSegment segment; gboolean accurate; gint64 offset; GstClockTime start_ts; } GstBaseParseSeek; 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 GType base_parse_type = 0; if (!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, }; base_parse_type = g_type_register_static (GST_TYPE_ELEMENT, "GstAudioBaseParseBad", &base_parse_info, G_TYPE_FLAG_ABSTRACT); } return 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); static void gst_base_parse_set_index (GstElement * element, GstIndex * index); static GstIndex *gst_base_parse_get_index (GstElement * element); static gboolean gst_base_parse_sink_activate (GstPad * sinkpad); static gboolean gst_base_parse_sink_activate_push (GstPad * pad, gboolean active); static gboolean gst_base_parse_sink_activate_pull (GstPad * pad, 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, GstEvent * event); static gboolean gst_base_parse_sink_event (GstPad * pad, GstEvent * event); static gboolean gst_base_parse_query (GstPad * pad, GstQuery * query); static gboolean gst_base_parse_sink_setcaps (GstPad * pad, GstCaps * caps); static const GstQueryType *gst_base_parse_get_querytypes (GstPad * pad); static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstBuffer * buffer); static void gst_base_parse_loop (GstPad * pad); static gboolean gst_base_parse_check_frame (GstBaseParse * parse, GstBuffer * buffer, guint * framesize, gint * skipsize); static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse, GstBuffer * buffer); 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_process_fragment (GstBaseParse * parse, gboolean push_only); 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; } static void gst_base_parse_finalize (GObject * object) { GstBaseParse *parse = GST_BASE_PARSE (object); GstEvent **p_ev; g_mutex_free (parse->parse_lock); g_object_unref (parse->adapter); if (parse->pending_segment) { p_ev = &parse->pending_segment; gst_event_replace (p_ev, NULL); } if (parse->close_segment) { p_ev = &parse->close_segment; gst_event_replace (p_ev, NULL); } 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; if (parse->priv->index) { gst_object_unref (parse->priv->index); parse->priv->index = NULL; } 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); gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index); gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index); /* Default handlers */ klass->check_valid_frame = gst_base_parse_check_frame; klass->parse_frame = gst_base_parse_parse_frame; 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_setcaps_function (parse->sinkpad, GST_DEBUG_FUNCPTR (gst_base_parse_sink_setcaps)); 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_activatepush_function (parse->sinkpad, GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_push)); gst_pad_set_activatepull_function (parse->sinkpad, GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_pull)); 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_type_function (parse->srcpad, GST_DEBUG_FUNCPTR (gst_base_parse_get_querytypes)); gst_pad_set_query_function (parse->srcpad, GST_DEBUG_FUNCPTR (gst_base_parse_query)); gst_pad_use_fixed_caps (parse->srcpad); gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad); GST_DEBUG_OBJECT (parse, "src created"); parse->parse_lock = g_mutex_new (); parse->adapter = gst_adapter_new (); parse->priv->pad_mode = GST_ACTIVATE_NONE; /* init state */ gst_base_parse_reset (parse); GST_DEBUG_OBJECT (parse, "init ok"); } 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 = 50; 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->seekable = GST_BASE_PARSE_SEEK_DEFAULT; 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->next_ts = 0; parse->priv->passthrough = 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 = 0; parse->priv->index_last_offset = 0; 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->last_ts = GST_CLOCK_TIME_NONE; parse->priv->last_offset = 0; if (parse->pending_segment) { gst_event_unref (parse->pending_segment); parse->pending_segment = 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; 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; GST_OBJECT_UNLOCK (parse); } /** * gst_base_parse_check_frame: * @parse: #GstBaseParse. * @buffer: GstBuffer. * @framesize: This will be set to tell the found frame size in bytes. * @skipsize: Output parameter that tells how much data needs to be skipped * in order to find the following frame header. * * Default callback for check_valid_frame. * * Returns: Always TRUE. */ static gboolean gst_base_parse_check_frame (GstBaseParse * parse, GstBuffer * buffer, guint * framesize, gint * skipsize) { *framesize = GST_BUFFER_SIZE (buffer); *skipsize = 0; return TRUE; } /** * gst_base_parse_parse_frame: * @parse: #GstBaseParse. * @buffer: #GstBuffer. * * Default callback for parse_frame. */ static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse, GstBuffer * 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, GstEvent * event) { GstBaseParse *parse; GstBaseParseClass *bclass; gboolean handled = FALSE; gboolean ret = TRUE; parse = GST_BASE_PARSE (gst_pad_get_parent (pad)); bclass = GST_BASE_PARSE_GET_CLASS (parse); GST_DEBUG_OBJECT (parse, "handling event %d", GST_EVENT_TYPE (event)); /* Cache all events except EOS, NEWSEGMENT and FLUSH_STOP if we have a * pending segment */ if (parse->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS && GST_EVENT_TYPE (event) != GST_EVENT_NEWSEGMENT && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) { 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->event) handled = bclass->event (parse, event); if (!handled) handled = gst_base_parse_sink_eventfunc (parse, event); if (!handled) ret = gst_pad_event_default (pad, event); } gst_object_unref (parse); 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. * * Returns: TRUE if the event was handled and not need forwarding. */ static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event) { gboolean handled = FALSE; GstEvent **eventp; switch (GST_EVENT_TYPE (event)) { case GST_EVENT_NEWSEGMENT: { gdouble rate, applied_rate; GstFormat format; gint64 start, stop, pos, next_ts, offset = 0; gboolean update; gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate, &format, &start, &stop, &pos); GST_DEBUG_OBJECT (parse, "newseg rate %g, applied rate %g, " "format %d, start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT ", pos = %" GST_TIME_FORMAT, rate, applied_rate, format, GST_TIME_ARGS (start), GST_TIME_ARGS (stop), GST_TIME_ARGS (pos)); if (format == GST_FORMAT_BYTES) { GstClockTime seg_start, seg_stop; GstBaseParseSeek *seek = NULL; GSList *node; /* stop time is allowed to be open-ended, but not start & pos */ seg_stop = GST_CLOCK_TIME_NONE; seg_start = 0; offset = pos; GST_OBJECT_LOCK (parse); for (node = parse->priv->pending_seeks; node; node = node->next) { GstBaseParseSeek *tmp = node->data; if (tmp->offset == pos) { 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); seg_start = seek->segment.start; seg_stop = seek->segment.stop; 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, start, GST_FORMAT_TIME, (gint64 *) & seg_start); parse->priv->exact_position = (start == 0); next_ts = seg_start; } gst_event_unref (event); event = gst_event_new_new_segment_full (update, rate, applied_rate, GST_FORMAT_TIME, seg_start, seg_stop, seg_start); format = GST_FORMAT_TIME; start = seg_start; stop = seg_stop; GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. " "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT, GST_TIME_ARGS (seg_start), GST_TIME_ARGS (seg_stop)); } else if (format != GST_FORMAT_TIME) { /* Unknown incoming segment format. Output a default open-ended * TIME segment */ gst_event_unref (event); event = gst_event_new_new_segment_full (update, rate, applied_rate, GST_FORMAT_TIME, 0, GST_CLOCK_TIME_NONE, 0); format = GST_FORMAT_TIME; next_ts = start = 0; stop = GST_CLOCK_TIME_NONE; } 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 = start; } gst_segment_set_newsegment_full (&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. */ eventp = &parse->pending_segment; gst_event_replace (eventp, event); gst_event_unref (event); handled = TRUE; /* but finish the current segment */ GST_DEBUG_OBJECT (parse, "draining current segment"); if (parse->segment.rate > 0.0) gst_base_parse_drain (parse); else gst_base_parse_process_fragment (parse, FALSE); gst_adapter_clear (parse->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; break; } case GST_EVENT_FLUSH_START: parse->priv->flushing = TRUE; handled = 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: gst_adapter_clear (parse->adapter); gst_base_parse_clear_queues (parse); parse->priv->flushing = FALSE; parse->priv->discont = TRUE; parse->priv->last_ts = GST_CLOCK_TIME_NONE; break; case GST_EVENT_EOS: if (parse->segment.rate > 0.0) gst_base_parse_drain (parse); else gst_base_parse_process_fragment (parse, FALSE); /* 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 before eos */ if (parse->pending_segment) { gst_pad_push_event (parse->srcpad, parse->pending_segment); parse->pending_segment = NULL; } break; default: break; } return handled; } /** * 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, GstEvent * event) { GstBaseParse *parse; GstBaseParseClass *bclass; gboolean handled = FALSE; gboolean ret = TRUE; parse = GST_BASE_PARSE (gst_pad_get_parent (pad)); 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) handled = bclass->src_event (parse, event); if (!handled) ret = gst_pad_event_default (pad, event); else gst_event_unref (event); gst_object_unref (parse); return ret; } /** * 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 handled = FALSE; switch (GST_EVENT_TYPE (event)) { case GST_EVENT_SEEK: { if (parse->priv->seekable > GST_BASE_PARSE_SEEK_NONE) { handled = gst_base_parse_handle_seek (parse, event); } break; } default: break; } return handled; } /** * 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) return FALSE; duration = parse->priv->acc_duration / GST_MSECOND; bytes = parse->priv->bytecount; if (G_UNLIKELY (!duration || !bytes)) return FALSE; 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 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 if (src_format == GST_FORMAT_DEFAULT) { /* DEFAULT == frame-based */ if (dest_format == GST_FORMAT_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 if (dest_format == GST_FORMAT_BYTES) { } } return ret; } /** * gst_base_parse_update_duration: * @parse: #GstBaseParse. * */ static void gst_base_parse_update_duration (GstBaseParse * aacparse) { GstPad *peer; GstBaseParse *parse; parse = GST_BASE_PARSE (aacparse); peer = gst_pad_get_peer (parse->sinkpad); if (peer) { GstFormat pformat = GST_FORMAT_BYTES; gboolean qres = FALSE; gint64 ptot, dest_value; qres = gst_pad_query_duration (peer, &pformat, &ptot); gst_object_unref (GST_OBJECT (peer)); if (qres) { if (gst_base_parse_convert (parse, pformat, ptot, GST_FORMAT_TIME, &dest_value)) parse->priv->estimated_duration = dest_value; } } } static void gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min, gboolean post_avg, gboolean post_max) { GstTagList *taglist = gst_tag_list_new (); if (post_min && parse->priv->post_min_bitrate) 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) { 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) 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); gst_element_found_tags_for_pad (GST_ELEMENT (parse), parse->srcpad, 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, GstBuffer * buffer) { /* Only update the tag on a 10 kbps delta */ static const gint update_threshold = 10000; GstBaseParseClass *klass; guint64 data_len, frame_dur; gint overhead = 0, frame_bitrate, old_avg_bitrate; gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE; klass = GST_BASE_PARSE_GET_CLASS (parse); if (klass->get_frame_overhead) { overhead = klass->get_frame_overhead (parse, buffer); if (overhead == -1) return; } data_len = GST_BUFFER_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); } frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur; 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; } else { 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); /* If average bitrate changes that much and no valid (time) duration provided, * then post a new duration message so applications can update their cached * values */ if (update_avg && !(parse->priv->duration_fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (parse->priv->duration))) gst_element_post_message (GST_ELEMENT (parse), gst_message_new_duration (GST_OBJECT (parse), GST_FORMAT_TIME, -1)); 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 >= 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_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_OBJECT_LOCK (parse); gst_index_add_associationv (parse->priv->index, parse->priv->index_id, (key) ? GST_ASSOCIATION_FLAG_KEY_UNIT : GST_ASSOCIATION_FLAG_NONE, 2, (const GstIndexAssociation *) &associations); GST_OBJECT_UNLOCK (parse); 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) { GstFormat fmt = GST_FORMAT_BYTES; GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop"); gst_pad_query_peer_duration (parse->sinkpad, &fmt, &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) { GstFormat fmt = GST_FORMAT_TIME; gint64 stop; if (gst_pad_query_peer_duration (parse->sinkpad, &fmt, &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); } /** * gst_base_parse_handle_and_push_buffer: * @parse: #GstBaseParse. * @klass: #GstBaseParseClass. * @buffer: #GstBuffer. * * 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_buffer (GstBaseParse * parse, GstBaseParseClass * klass, GstBuffer * buffer) { GstFlowReturn ret; gint64 offset; if (parse->priv->discont) { GST_DEBUG_OBJECT (parse, "marking DISCONT"); GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT); parse->priv->discont = FALSE; } /* some one-time start-up */ if (G_UNLIKELY (!parse->priv->framecount)) { gst_base_parse_check_seekability (parse); gst_base_parse_check_upstream (parse); } GST_LOG_OBJECT (parse, "parsing frame at offset %" G_GUINT64_FORMAT " (%#" G_GINT64_MODIFIER "x) of size %d", GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer), GST_BUFFER_SIZE (buffer)); /* store offset as it might get overwritten */ offset = GST_BUFFER_OFFSET (buffer); ret = klass->parse_frame (parse, buffer); /* check initial frame to determine 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 && ret == GST_FLOW_OK)) { if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) { 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; } } /* re-use default handler to add missing metadata as-much-as-possible */ gst_base_parse_parse_frame (parse, buffer); 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); /* First buffers are dropped, this means that the subclass needs more * frames to decide on the format and queues them internally */ /* convert internal flow to OK and mark discont for the next buffer. */ if (ret == GST_BASE_PARSE_FLOW_DROPPED) { gst_buffer_unref (buffer); return GST_FLOW_OK; } else if (ret != GST_FLOW_OK) { return ret; } return gst_base_parse_push_buffer (parse, buffer); } /** * gst_base_parse_push_buffer: * @parse: #GstBaseParse. * @buffer: #GstBuffer. * * Pushes the buffer downstream, sends any pending events and * does some timestamp and segment handling. * * This must be called with srcpad STREAM_LOCK held. * * Returns: #GstFlowReturn */ GstFlowReturn gst_base_parse_push_buffer (GstBaseParse * parse, GstBuffer * buffer) { 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); GST_LOG_OBJECT (parse, "processing buffer of size %d with ts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT, GST_BUFFER_SIZE (buffer), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)), GST_TIME_ARGS (GST_BUFFER_DURATION (buffer))); /* update stats */ parse->priv->bytecount += GST_BUFFER_SIZE (buffer); if (!GST_BUFFER_FLAG_IS_SET (buffer, GST_BASE_PARSE_BUFFER_FLAG_NO_FRAME)) { parse->priv->framecount++; if (GST_BUFFER_DURATION_IS_VALID (buffer)) { parse->priv->acc_duration += GST_BUFFER_DURATION (buffer); } } GST_BUFFER_FLAG_UNSET (buffer, GST_BASE_PARSE_BUFFER_FLAG_NO_FRAME); if (parse->priv->update_interval && (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 */ g_return_val_if_fail (GST_PAD_CAPS (parse->srcpad), GST_FLOW_ERROR); gst_buffer_set_caps (buffer, GST_PAD_CAPS (parse->srcpad)); /* 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_ACTIVATE_PULL || parse->priv->upstream_seekable)) { /* segment times are typically estimates, * actual frame data might lead subclass to different timestamps, * so override segment start from what is supplied there */ if (G_UNLIKELY (parse->pending_segment && !parse->priv->exact_position && GST_CLOCK_TIME_IS_VALID (last_start))) { gst_event_unref (parse->pending_segment); parse->segment.start = MIN ((guint64) last_start, (guint64) parse->segment.stop); GST_DEBUG_OBJECT (parse, "adjusting pending segment start to %" GST_TIME_FORMAT, GST_TIME_ARGS (parse->segment.start)); parse->pending_segment = gst_event_new_new_segment (FALSE, parse->segment.rate, parse->segment.format, parse->segment.start, parse->segment.stop, parse->segment.start); } /* handle gaps, e.g. non-zero start-time, in as much not handled by above */ if (GST_CLOCK_TIME_IS_VALID (parse->segment.last_stop) && 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.last_stop, 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.last_stop), GST_TIME_ARGS (last_start)); if (G_UNLIKELY (parse->pending_segment)) { gst_event_unref (parse->pending_segment); parse->segment.start = last_start; parse->pending_segment = gst_event_new_new_segment (FALSE, parse->segment.rate, parse->segment.format, parse->segment.start, parse->segment.stop, parse->segment.start); } else { /* send newsegment events such that the gap is not accounted in * accum time, hence running_time */ /* close ahead of gap */ gst_pad_push_event (parse->srcpad, gst_event_new_new_segment (TRUE, parse->segment.rate, parse->segment.format, parse->segment.last_stop, parse->segment.last_stop, parse->segment.last_stop)); /* skip gap */ gst_pad_push_event (parse->srcpad, gst_event_new_new_segment (FALSE, parse->segment.rate, parse->segment.format, last_start, parse->segment.stop, last_start)); } /* align segment view with downstream, * prevents double-counting accum when closing segment */ gst_segment_set_newsegment (&parse->segment, FALSE, parse->segment.rate, parse->segment.format, last_start, parse->segment.stop, last_start); parse->segment.last_stop = last_start; } } } /* and should then also be linked downstream, so safe to send some events */ if (G_UNLIKELY (parse->close_segment)) { /* only set up by loop */ GST_DEBUG_OBJECT (parse, "loop sending close segment"); gst_pad_push_event (parse->srcpad, parse->close_segment); parse->close_segment = NULL; } if (G_UNLIKELY (parse->pending_segment)) { GST_DEBUG_OBJECT (parse, "%s push pending segment", parse->priv->pad_mode == GST_ACTIVATE_PULL ? "loop" : "chain"); gst_pad_push_event (parse->srcpad, parse->pending_segment); parse->pending_segment = NULL; } /* update bitrates and optionally post corresponding tags * (following newsegment) */ gst_base_parse_update_bitrates (parse, buffer); 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; } if (klass->pre_push_buffer) ret = klass->pre_push_buffer (parse, buffer); else ret = GST_BASE_PARSE_FLOW_CLIP; if (ret == GST_BASE_PARSE_FLOW_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_UNEXPECTED; } 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) { 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 (%d bytes) dropped", GST_BUFFER_SIZE (buffer)); gst_buffer_unref (buffer); ret = GST_FLOW_OK; } else if (ret == GST_FLOW_OK) { if (parse->segment.rate > 0.0) { ret = gst_pad_push (parse->srcpad, buffer); GST_LOG_OBJECT (parse, "frame (%d bytes) pushed: %s", GST_BUFFER_SIZE (buffer), gst_flow_get_name (ret)); } else { GST_LOG_OBJECT (parse, "frame (%d bytes) queued for now", GST_BUFFER_SIZE (buffer)); parse->priv->buffers_queued = g_slist_prepend (parse->priv->buffers_queued, buffer); ret = GST_FLOW_OK; } } else { gst_buffer_unref (buffer); GST_LOG_OBJECT (parse, "frame (%d bytes) not pushed: %s", GST_BUFFER_SIZE (buffer), gst_flow_get_name (ret)); /* if we are not sufficiently in control, let upstream decide on EOS */ if (ret == GST_FLOW_UNEXPECTED && (parse->priv->passthrough || (parse->priv->pad_mode == GST_ACTIVATE_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.last_stop < last_stop) gst_segment_set_last_stop (&parse->segment, GST_FORMAT_TIME, last_stop); return ret; } /** * gst_base_parse_drain: * @parse: #GstBaseParse. * * 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->adapter); if (!avail) break; if (gst_base_parse_chain (parse->sinkpad, NULL) != GST_FLOW_OK) { break; } /* nothing changed, maybe due to truncated frame; break infinite loop */ if (avail == gst_adapter_available (parse->adapter)) { GST_DEBUG_OBJECT (parse, "no change during draining; flushing"); gst_adapter_clear (parse->adapter); } } parse->priv->drain = FALSE; } /** * gst_base_parse_process_fragment: * @parse: #GstBaseParse. * * 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_process_fragment (GstBaseParse * parse, gboolean push_only) { GstBuffer *buf; GstFlowReturn ret = GST_FLOW_OK; GSList *send = NULL; if (push_only) goto push; /* 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); GST_LOG_OBJECT (parse, "adding pending buffer (size %d)", GST_BUFFER_SIZE (buf)); gst_adapter_push (parse->adapter, buf); parse->priv->buffers_pending = g_slist_delete_link (parse->priv->buffers_pending, parse->priv->buffers_pending); } /* invalidate so no fall-back timestamping is performed; * ok if taken from subclass or upstream */ parse->priv->next_ts = GST_CLOCK_TIME_NONE; /* prevent it hanging around stop all the time */ parse->segment.last_stop = GST_CLOCK_TIME_NONE; /* mark next run */ parse->priv->discont = TRUE; /* 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); push: /* 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"); } /* reverse order for ascending sending */ send = g_slist_prepend (send, buf); parse->priv->buffers_queued = g_slist_delete_link (parse->priv->buffers_queued, parse->priv->buffers_queued); } /* 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)); if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts))) parse->priv->last_ts = GST_BUFFER_TIMESTAMP (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); } } } /* any trailing unused no longer usable (ideally none) */ if (G_UNLIKELY (gst_adapter_available (parse->adapter))) { GST_DEBUG_OBJECT (parse, "discarding %d trailing bytes", gst_adapter_available (parse->adapter)); gst_adapter_clear (parse->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; } /** * gst_base_parse_chain: * @pad: #GstPad. * @buffer: #GstBuffer. * * Returns: #GstFlowReturn. */ static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstBuffer * buffer) { GstBaseParseClass *bclass; GstBaseParse *parse; GstFlowReturn ret = GST_FLOW_OK; GstBuffer *outbuf = NULL; GstBuffer *tmpbuf = NULL; guint fsize = 0; gint skip = -1; const guint8 *data; guint min_size; GstClockTime timestamp; parse = GST_BASE_PARSE (GST_OBJECT_PARENT (pad)); bclass = GST_BASE_PARSE_GET_CLASS (parse); if (G_LIKELY (buffer)) { GST_LOG_OBJECT (parse, "buffer size: %d, offset = %" G_GINT64_FORMAT, GST_BUFFER_SIZE (buffer), GST_BUFFER_OFFSET (buffer)); if (G_UNLIKELY (parse->priv->passthrough)) { buffer = gst_buffer_make_metadata_writable (buffer); return gst_base_parse_push_buffer (parse, buffer); } /* upstream feeding us in reverse playback; * gather each fragment, then process it in single run */ 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_process_fragment (parse, FALSE); } gst_adapter_push (parse->adapter, buffer); return ret; } gst_adapter_push (parse->adapter, buffer); } /* Parse and push as many frames as possible */ /* Stop either when adapter is empty or we are flushing */ while (!parse->priv->flushing) { tmpbuf = gst_buffer_new (); /* Synchronization loop */ for (;;) { GST_BASE_PARSE_LOCK (parse); min_size = parse->priv->min_frame_size; GST_BASE_PARSE_UNLOCK (parse); if (G_UNLIKELY (parse->priv->drain)) { min_size = gst_adapter_available (parse->adapter); GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size); if (G_UNLIKELY (!min_size)) { gst_buffer_unref (tmpbuf); goto done; } } /* Collect at least min_frame_size bytes */ if (gst_adapter_available (parse->adapter) < min_size) { GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)", gst_adapter_available (parse->adapter)); gst_buffer_unref (tmpbuf); goto done; } data = gst_adapter_peek (parse->adapter, min_size); GST_BUFFER_DATA (tmpbuf) = (guint8 *) data; GST_BUFFER_SIZE (tmpbuf) = min_size; GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset; GST_BUFFER_FLAG_SET (tmpbuf, GST_MINI_OBJECT_FLAG_READONLY); if (parse->priv->discont) { GST_DEBUG_OBJECT (parse, "marking DISCONT"); GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT); } skip = -1; if (bclass->check_valid_frame (parse, tmpbuf, &fsize, &skip)) { if (gst_adapter_available (parse->adapter) < fsize) { GST_DEBUG_OBJECT (parse, "found valid frame but not enough data available (only %d bytes)", gst_adapter_available (parse->adapter)); gst_buffer_unref (tmpbuf); goto done; } break; } if (skip == -1) { /* subclass didn't touch this value. By default we skip 1 byte */ skip = 1; } if (skip > 0) { 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->adapter, NULL); outbuf = gst_adapter_take_buffer (parse->adapter, skip); outbuf = gst_buffer_make_metadata_writable (outbuf); GST_BUFFER_TIMESTAMP (outbuf) = timestamp; parse->priv->buffers_pending = g_slist_prepend (parse->priv->buffers_pending, outbuf); outbuf = NULL; } else { gst_adapter_flush (parse->adapter, skip); } parse->priv->offset += skip; if (!parse->priv->discont) parse->priv->sync_offset = parse->priv->offset; parse->priv->discont = TRUE; } /* There is a possibility that subclass set the skip value to zero. This means that it has probably found a frame but wants to ask more data (by increasing the min_size) to be sure of this. */ if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) { gst_buffer_unref (tmpbuf); goto done; } } gst_buffer_unref (tmpbuf); tmpbuf = NULL; if (skip > 0) { /* Subclass found the sync, but still wants to skip some data */ GST_LOG_OBJECT (parse, "skipping %d bytes", skip); gst_adapter_flush (parse->adapter, skip); parse->priv->offset += skip; } /* Grab lock to prevent a race with FLUSH_START handler */ GST_PAD_STREAM_LOCK (parse->srcpad); /* FLUSH_START event causes the "flushing" flag to be set. In this * case we can leave the frame pushing loop */ if (parse->priv->flushing) { GST_PAD_STREAM_UNLOCK (parse->srcpad); break; } /* FIXME: Would it be more efficient to make a subbuffer instead? */ outbuf = gst_adapter_take_buffer (parse->adapter, fsize); outbuf = gst_buffer_make_metadata_writable (outbuf); /* Subclass may want to know the data offset */ GST_BUFFER_OFFSET (outbuf) = parse->priv->offset; parse->priv->offset += fsize; /* move along with upstream timestamp (if any), * but interpolate in between */ timestamp = gst_adapter_prev_timestamp (parse->adapter, NULL); if (GST_CLOCK_TIME_IS_VALID (timestamp) && (parse->priv->prev_ts != timestamp)) { parse->priv->prev_ts = parse->priv->next_ts = timestamp; } ret = gst_base_parse_handle_and_push_buffer (parse, bclass, outbuf); GST_PAD_STREAM_UNLOCK (parse->srcpad); if (ret != GST_FLOW_OK) { GST_LOG_OBJECT (parse, "push returned %d", ret); break; } } 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_SIZE (parse->priv->cache); if (cache_offset <= parse->priv->offset && (parse->priv->offset + size) <= (cache_offset + cache_size)) { *buffer = gst_buffer_create_sub (parse->priv->cache, 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_SIZE (parse->priv->cache) >= size) { *buffer = gst_buffer_create_sub (parse->priv->cache, 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_SIZE (parse->priv->cache) < size) { GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %" G_GUINT64_FORMAT ": wanted %u bytes, got %u bytes", parse->priv->offset, size, GST_BUFFER_SIZE (parse->priv->cache)); *buffer = parse->priv->cache; parse->priv->cache = NULL; return GST_FLOW_OK; } *buffer = gst_buffer_create_sub (parse->priv->cache, 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_UNEXPECTED; 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 { GstFormat dstformat = GST_FORMAT_BYTES; if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts, &dstformat, &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; gst_adapter_push (parse->adapter, buffer); ret = gst_base_parse_process_fragment (parse, FALSE); if (ret != GST_FLOW_OK) goto exit; 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 ** buf, gboolean full) { GstBuffer *buffer, *outbuf; GstFlowReturn ret = GST_FLOW_OK; guint fsize = 0, min_size; gint skip = 0; g_return_val_if_fail (buf != NULL, GST_FLOW_ERROR); while (TRUE) { GST_BASE_PARSE_LOCK (parse); min_size = parse->priv->min_frame_size; GST_BASE_PARSE_UNLOCK (parse); ret = gst_base_parse_pull_range (parse, min_size, &buffer); if (ret != GST_FLOW_OK) goto done; if (parse->priv->discont) { GST_DEBUG_OBJECT (parse, "marking DISCONT"); GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT); } /* if we got a short read, inform subclass we are draining leftover * and no more is to be expected */ if (GST_BUFFER_SIZE (buffer) < min_size) parse->priv->drain = TRUE; skip = -1; if (klass->check_valid_frame (parse, buffer, &fsize, &skip)) { parse->priv->drain = FALSE; break; } parse->priv->drain = FALSE; if (skip == -1) skip = 1; if (skip > 0) { GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip); if (full && 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 ... */ outbuf = gst_buffer_create_sub (buffer, 0, skip); parse->priv->buffers_pending = g_slist_prepend (parse->priv->buffers_pending, outbuf); outbuf = NULL; } parse->priv->offset += skip; if (!parse->priv->discont) parse->priv->sync_offset = parse->priv->offset; parse->priv->discont = TRUE; } /* skip == 0 should imply subclass set min_size to need more data ... */ GST_DEBUG_OBJECT (parse, "finding sync..."); gst_buffer_unref (buffer); if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) { goto done; } } if (fsize <= GST_BUFFER_SIZE (buffer)) { outbuf = gst_buffer_create_sub (buffer, 0, fsize); GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer); gst_buffer_unref (buffer); } else { gst_buffer_unref (buffer); ret = gst_base_parse_pull_range (parse, fsize, &outbuf); if (ret != GST_FLOW_OK) goto done; if (GST_BUFFER_SIZE (outbuf) < fsize) { gst_buffer_unref (outbuf); ret = GST_FLOW_UNEXPECTED; } } parse->priv->offset += fsize; /* Does the subclass want to skip too? */ if (skip > 0) parse->priv->offset += skip; *buf = outbuf; done: return ret; } /** * gst_base_parse_loop: * @pad: GstPad * * Loop that is used in pull mode to retrieve data from upstream. */ static void gst_base_parse_loop (GstPad * pad) { GstBaseParse *parse; GstBaseParseClass *klass; GstBuffer *outbuf; GstFlowReturn ret = GST_FLOW_OK; parse = GST_BASE_PARSE (gst_pad_get_parent (pad)); klass = GST_BASE_PARSE_GET_CLASS (parse); /* 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) { if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts)) { ret = gst_base_parse_handle_previous_fragment (parse); goto done; } } ret = gst_base_parse_scan_frame (parse, klass, &outbuf, TRUE); if (ret != GST_FLOW_OK) goto done; /* This always unrefs the outbuf, even if error occurs */ ret = gst_base_parse_handle_and_push_buffer (parse, klass, outbuf); /* eat expected eos signalling past segment in reverse playback */ if (parse->segment.rate < 0.0 && ret == GST_FLOW_UNEXPECTED && parse->segment.last_stop >= parse->segment.stop) { GST_DEBUG_OBJECT (parse, "downstream has reached end of segment"); /* push what was accumulated during loop run */ gst_base_parse_process_fragment (parse, TRUE); ret = GST_FLOW_OK; } done: if (ret == GST_FLOW_UNEXPECTED) goto eos; else if (ret != GST_FLOW_OK) goto pause; gst_object_unref (parse); return; /* ERRORS */ eos: { ret = GST_FLOW_UNEXPECTED; 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_UNEXPECTED) { /* handle end-of-stream/segment */ if (parse->segment.flags & GST_SEEK_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)); } 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_UNEXPECTED) { /* 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) { /* newsegment before eos */ if (parse->pending_segment) { gst_pad_push_event (parse->srcpad, parse->pending_segment); parse->pending_segment = NULL; } gst_pad_push_event (parse->srcpad, gst_event_new_eos ()); } gst_object_unref (parse); } } /** * gst_base_parse_sink_activate: * @sinkpad: #GstPad to be activated. * * Returns: TRUE if activation succeeded. */ static gboolean gst_base_parse_sink_activate (GstPad * sinkpad) { GstBaseParse *parse; gboolean result = TRUE; parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad)); GST_DEBUG_OBJECT (parse, "sink activate"); if (gst_pad_check_pull_range (sinkpad)) { GST_DEBUG_OBJECT (parse, "trying to activate in pull mode"); result = gst_pad_activate_pull (sinkpad, TRUE); } else { GST_DEBUG_OBJECT (parse, "trying to activate in push mode"); result = gst_pad_activate_push (sinkpad, TRUE); } GST_DEBUG_OBJECT (parse, "sink activate return %d", result); gst_object_unref (parse); return result; } /** * gst_base_parse_activate: * @parse: #GstBaseParse. * @active: TRUE if element will be activated, FALSE if disactivated. * * Returns: TRUE if the operation succeeded. */ static gboolean gst_base_parse_activate (GstBaseParse * parse, gboolean active) { GstBaseParseClass *klass; gboolean result = FALSE; GST_DEBUG_OBJECT (parse, "activate"); klass = GST_BASE_PARSE_GET_CLASS (parse); if (active) { if (parse->priv->pad_mode == GST_ACTIVATE_NONE && klass->start) result = klass->start (parse); } 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_ACTIVATE_NONE && klass->stop) result = klass->stop (parse); parse->priv->pad_mode = GST_ACTIVATE_NONE; } GST_DEBUG_OBJECT (parse, "activate: %d", result); return result; } /** * gst_base_parse_sink_activate_push: * @pad: #GstPad to be (de)activated. * @active: TRUE when activating, FALSE when deactivating. * * Returns: TRUE if (de)activation succeeded. */ static gboolean gst_base_parse_sink_activate_push (GstPad * pad, gboolean active) { gboolean result = TRUE; GstBaseParse *parse; parse = GST_BASE_PARSE (gst_pad_get_parent (pad)); GST_DEBUG_OBJECT (parse, "sink activate push"); result = gst_base_parse_activate (parse, active); if (result) parse->priv->pad_mode = active ? GST_ACTIVATE_PUSH : GST_ACTIVATE_NONE; GST_DEBUG_OBJECT (parse, "sink activate push: %d", result); gst_object_unref (parse); return result; } /** * gst_base_parse_sink_activate_pull: * @sinkpad: #GstPad to be (de)activated. * @active: TRUE when activating, FALSE when deactivating. * * Returns: TRUE if (de)activation succeeded. */ static gboolean gst_base_parse_sink_activate_pull (GstPad * sinkpad, gboolean active) { gboolean result = FALSE; GstBaseParse *parse; parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad)); GST_DEBUG_OBJECT (parse, "activate pull"); result = gst_base_parse_activate (parse, active); if (result) { if (active) { parse->pending_segment = gst_event_new_new_segment (FALSE, parse->segment.rate, parse->segment.format, parse->segment.start, parse->segment.stop, parse->segment.last_stop); result &= gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop, sinkpad); } else { result &= gst_pad_stop_task (sinkpad); } } if (result) parse->priv->pad_mode = active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE; GST_DEBUG_OBJECT (parse, "sink activate pull: %d", result); gst_object_unref (parse); return result; } /** * gst_base_parse_set_duration: * @parse: #GstBaseParse. * @fmt: #GstFormat. * @duration: duration value. * * 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); GST_BASE_PARSE_LOCK (parse); 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: GST_BASE_PARSE_UNLOCK (parse); } /** * gst_base_parse_set_seek: * @parse: #GstBaseParse. * @seek: #GstBaseParseSeekable. * @abitrate: average bitrate. * * Sets whether and how the media is seekable (in time). * Also optionally provides 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, and seekability is assumed * possible based on estimated bitrate. */ void gst_base_parse_set_seek (GstBaseParse * parse, GstBaseParseSeekable seek, guint bitrate) { parse->priv->seekable = seek; parse->priv->bitrate = 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); GST_BASE_PARSE_LOCK (parse); parse->priv->min_frame_size = min_size; GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size); GST_BASE_PARSE_UNLOCK (parse); } /** * gst_base_transform_set_passthrough: * @trans: the #GstBaseParse to set * @passthrough: boolean indicating passthrough mode. * * Set passthrough mode for this parser. If operating in passthrough, * incoming buffers are pushed through unmodified. */ void gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough) { g_return_if_fail (parse != NULL); GST_BASE_PARSE_LOCK (parse); parse->priv->passthrough = passthrough; GST_LOG_OBJECT (parse, "set passthrough: %d", passthrough); GST_BASE_PARSE_UNLOCK (parse); } /** * gst_base_transform_set_frame_props: * @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_props (GstBaseParse * parse, guint fps_num, guint fps_den, guint lead_in, guint lead_out) { g_return_if_fail (parse != NULL); GST_BASE_PARSE_LOCK (parse); 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); } 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_UNLOCK (parse); } /** * gst_base_transform_get_sync: * @parse: the #GstBaseParse to query * * Returns: TRUE if parser is considered 'in sync'. That is, frames have been * continuously successfully parsed and pushed. */ gboolean gst_base_parse_get_sync (GstBaseParse * parse) { gboolean ret; g_return_val_if_fail (parse != NULL, FALSE); GST_BASE_PARSE_LOCK (parse); /* losing sync is pretty much a discont (and vice versa), no ? */ ret = !parse->priv->discont; GST_BASE_PARSE_UNLOCK (parse); GST_DEBUG_OBJECT (parse, "sync: %d", ret); return ret; } /** * gst_base_transform_get_drain: * @parse: the #GstBaseParse to query * * Returns: TRUE if parser is currently 'draining'. That is, leftover data * (e.g. in FLUSH or EOS situation) is being parsed. */ gboolean gst_base_parse_get_drain (GstBaseParse * parse) { gboolean ret; g_return_val_if_fail (parse != NULL, FALSE); GST_BASE_PARSE_LOCK (parse); /* losing sync is pretty much a discont (and vice versa), no ? */ ret = parse->priv->drain; GST_BASE_PARSE_UNLOCK (parse); GST_DEBUG_OBJECT (parse, "drain: %d", ret); return ret; } 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; } GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res, GST_TIME_ARGS (*duration)); return res; } /** * gst_base_parse_get_querytypes: * @pad: GstPad * * Returns: A table of #GstQueryType items describing supported query types. */ static const GstQueryType * gst_base_parse_get_querytypes (GstPad * pad) { static const GstQueryType list[] = { GST_QUERY_POSITION, GST_QUERY_DURATION, GST_QUERY_FORMATS, GST_QUERY_SEEKING, GST_QUERY_CONVERT, 0 }; return list; } /** * gst_base_parse_query: * @pad: #GstPad. * @query: #GstQuery. * * Returns: TRUE on success. */ static gboolean gst_base_parse_query (GstPad * pad, GstQuery * query) { GstBaseParse *parse; gboolean res = FALSE; parse = GST_BASE_PARSE (GST_PAD_PARENT (pad)); 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); g_mutex_lock (parse->parse_lock); 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.last_stop)) { dest_value = parse->segment.last_stop; res = TRUE; } g_mutex_unlock (parse->parse_lock); if (res) gst_query_set_position (query, format, dest_value); else { res = gst_pad_query_default (pad, query); if (!res) { /* no precise result, upstream no idea either, then best estimate */ /* priv->offset is updated in both PUSH/PULL modes */ g_mutex_lock (parse->parse_lock); res = gst_base_parse_convert (parse, GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value); g_mutex_unlock (parse->parse_lock); } } 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, query); /* otherwise best estimate from us */ if (!res) { g_mutex_lock (parse->parse_lock); res = gst_base_parse_get_duration (parse, format, &duration); g_mutex_unlock (parse->parse_lock); 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, query); /* we may be able to help if in TIME */ if (fmt == GST_FORMAT_TIME && parse->priv->seekable > GST_BASE_PARSE_SEEK_NONE) { 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 = FALSE; } 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; } default: res = gst_pad_query_default (pad, 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; g_return_val_if_fail (GST_FLOW_ERROR, pos != NULL); g_return_val_if_fail (GST_FLOW_ERROR, time != NULL); g_return_val_if_fail (GST_FLOW_ERROR, duration != NULL); 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; ret = gst_base_parse_scan_frame (parse, klass, &buf, FALSE); if (ret != GST_FLOW_OK) goto done; GST_LOG_OBJECT (parse, "peek parsing frame at offset %" G_GUINT64_FORMAT " (%#" G_GINT64_MODIFIER "x) of size %d", GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf), GST_BUFFER_SIZE (buf)); /* get offset first, subclass parsing might dump other stuff in there */ *pos = GST_BUFFER_OFFSET (buf); ret = klass->parse_frame (parse, buf); /* but it should provide proper time */ *time = GST_BUFFER_TIMESTAMP (buf); *duration = GST_BUFFER_DURATION (buf); gst_buffer_unref (buf); GST_LOG_OBJECT (parse, "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT, GST_TIME_ARGS (*time), *pos); done: /* 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); /* 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; /* need initial positions; start and end */ lpos = parse->priv->first_frame_offset; ltime = parse->priv->first_frame_ts; htime = parse->priv->duration; hpos = parse->priv->upstream_size; /* 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_ACTIVATE_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 { 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_UNEXPECTED) { /* 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 */ newpos -= newpos == hpos ? chunk : 0; hpos = CLAMP (newpos, lpos, hpos); 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"); } else { /* undershoot too far */ newpos += newpos == hpos ? 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_OBJECT_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_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_OBJECT_UNLOCK (parse); exit: if (_ts) *_ts = ts; return bytes; } /** * gst_base_parse_handle_seek: * @parse: #GstBaseParse. * @event: #GstEvent. * * Returns: TRUE if seek succeeded. */ static gboolean gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event) { gdouble rate; GstFormat format; GstSeekFlags flags; GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type; gboolean flush, update, res = TRUE, accurate; gint64 cur, stop, seekpos, seekstop; GstSegment seeksegment = { 0, }; GstFormat dstformat; GstClockTime start_ts; gst_event_parse_seek (event, &rate, &format, &flags, &cur_type, &cur, &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, cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop)); /* no negative rates in push mode */ if (rate < 0.0 && parse->priv->pad_mode == GST_ACTIVATE_PUSH) goto negative_rate; if (cur_type != GST_SEEK_TYPE_SET || (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE)) goto wrong_type; /* For any format other than TIME, see if upstream handles * it directly or fail. For TIME, try upstream, but do it ourselves if * it fails upstream */ if (format != GST_FORMAT_TIME) { /* default action delegates to upstream */ return FALSE; } else { gst_event_ref (event); if (gst_pad_push_event (parse->sinkpad, event)) { return TRUE; } } /* 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. */ memcpy (&seeksegment, &parse->segment, sizeof (GstSegment)); GST_DEBUG_OBJECT (parse, "configuring seek"); gst_segment_set_seek (&seeksegment, rate, format, flags, cur_type, cur, 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.last_stop, TRUE, &start_ts); if (seeksegment.last_stop <= start_ts + TARGET_DIFFERENCE) { GST_DEBUG_OBJECT (parse, "accurate seek possible"); accurate = TRUE; } if (accurate) { GstClockTime startpos = seeksegment.last_stop; /* 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.last_stop; dstformat = GST_FORMAT_BYTES; if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.last_stop, &dstformat, &seekpos)) goto convert_failed; if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop, &dstformat, &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_ACTIVATE_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.last_stop; 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 ()); gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop ()); gst_base_parse_clear_queues (parse); } else { if (parse->close_segment) gst_event_unref (parse->close_segment); parse->close_segment = gst_event_new_new_segment (TRUE, parse->segment.rate, parse->segment.format, parse->segment.accum, parse->segment.last_stop, parse->segment.accum); /* keep track of our last_stop */ seeksegment.accum = parse->segment.last_stop; GST_DEBUG_OBJECT (parse, "Created close seg format %d, " "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT ", pos = %" GST_TIME_FORMAT, format, GST_TIME_ARGS (parse->segment.accum), GST_TIME_ARGS (parse->segment.last_stop), GST_TIME_ARGS (parse->segment.accum)); } memcpy (&parse->segment, &seeksegment, sizeof (GstSegment)); /* store the newsegment event so it can be sent from the streaming thread. */ if (parse->pending_segment) gst_event_unref (parse->pending_segment); /* This will be sent later in _loop() */ parse->pending_segment = gst_event_new_new_segment (FALSE, parse->segment.rate, parse->segment.format, parse->segment.start, parse->segment.stop, parse->segment.start); 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.last_stop; 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->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); GST_PAD_STREAM_UNLOCK (parse->sinkpad); } else { GstEvent *new_event; GstBaseParseSeek *seek; /* 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 && seekpos <= seekpos) seekstop = seekpos; new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flush, 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: return res; /* ERRORS */ negative_rate: { GST_DEBUG_OBJECT (parse, "negative playback rates are not supported yet."); 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; } } /** * gst_base_parse_handle_tag: * @parse: #GstBaseParse. * @event: #GstEvent. * * 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); 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; } } /** * gst_base_parse_sink_setcaps: * @pad: #GstPad. * @caps: #GstCaps. * * Returns: TRUE if caps were accepted. */ static gboolean gst_base_parse_sink_setcaps (GstPad * pad, GstCaps * caps) { GstBaseParse *parse; GstBaseParseClass *klass; gboolean res = TRUE; parse = GST_BASE_PARSE (GST_PAD_PARENT (pad)); klass = GST_BASE_PARSE_GET_CLASS (parse); GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps); if (klass->set_sink_caps) res = klass->set_sink_caps (parse, caps); return res && gst_pad_set_caps (pad, caps); } static void gst_base_parse_set_index (GstElement * element, GstIndex * index) { GstBaseParse *parse = GST_BASE_PARSE (element); GST_OBJECT_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 (element), &parse->priv->index_id); parse->priv->own_index = FALSE; } else parse->priv->index = NULL; GST_OBJECT_UNLOCK (parse); } static GstIndex * gst_base_parse_get_index (GstElement * element) { GstBaseParse *parse = GST_BASE_PARSE (element); GstIndex *result = NULL; GST_OBJECT_LOCK (parse); if (parse->priv->index) result = gst_object_ref (parse->priv->index); GST_OBJECT_UNLOCK (parse); return result; } 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 */ 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 = gst_index_factory_make ("memindex"); gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse), &parse->priv->index_id); parse->priv->own_index = TRUE; } 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; }