/* GStreamer * Copyright (C) 2012 Smart TV Alliance * Author: Thiago Sousa Santos , Collabora Ltd. * * gstmssdemux.c: * * 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:element-mssdemux * * Demuxes a Microsoft's Smooth Streaming manifest into its audio and/or video streams. * * */ /* * == Internals * * = Smooth streaming in a few lines * A SS stream is defined by a xml manifest file. This file has a list of * tracks (StreamIndex), each one can have multiple QualityLevels, that define * different encoding/bitrates. When playing a track, only one of those * QualityLevels can be active at a time (per stream). * * The StreamIndex defines a URL with {time} and {bitrate} tags that are * replaced by values indicated by the fragment start times and the selected * QualityLevel, that generates the fragments URLs. * * Another relevant detail is that the Isomedia fragments for smoothstreaming * won't contains a 'moov' atom, nor a 'stsd', so there is no information * about the media type/configuration on the fragments, it must be extracted * from the Manifest and passed downstream. mssdemux does this via GstCaps. * * = How mssdemux works * There is a gstmssmanifest.c utility that holds the manifest and parses * and has functions to extract information from it. mssdemux received the * manifest from its sink pad and starts processing it when it gets EOS. * * The Manifest is parsed and the streams are exposed, 1 pad for each, with * a initially selected QualityLevel. Each stream starts its own GstTaks that * is responsible for downloading fragments and pushing them downstream. * * When a new connection-speed is set, mssdemux evaluates the available * QualityLevels and might decide to switch to another one. In this case it * pushes a new GstCaps event indicating the new caps on the pads. * * All operations that intend to update the GstTasks state should be protected * with the GST_OBJECT_LOCK. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gst/gst-i18n-plugin.h" #include #include #include #include "gstmssdemux.h" GST_DEBUG_CATEGORY (mssdemux_debug); #define DEFAULT_CONNECTION_SPEED 0 #define DEFAULT_MAX_QUEUE_SIZE_BUFFERS 0 #define DEFAULT_BITRATE_LIMIT 0.8 #define DOWNLOAD_RATE_MAX_HISTORY_LENGTH 5 #define MAX_DOWNLOAD_ERROR_COUNT 3 enum { PROP_0, PROP_CONNECTION_SPEED, PROP_MAX_QUEUE_SIZE_BUFFERS, PROP_BITRATE_LIMIT, PROP_LAST }; static GstStaticPadTemplate gst_mss_demux_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/vnd.ms-sstr+xml") ); static GstStaticPadTemplate gst_mss_demux_videosrc_template = GST_STATIC_PAD_TEMPLATE ("video_%02u", GST_PAD_SRC, GST_PAD_SOMETIMES, GST_STATIC_CAPS_ANY); static GstStaticPadTemplate gst_mss_demux_audiosrc_template = GST_STATIC_PAD_TEMPLATE ("audio_%02u", GST_PAD_SRC, GST_PAD_SOMETIMES, GST_STATIC_CAPS_ANY); #define gst_mss_demux_parent_class parent_class G_DEFINE_TYPE (GstMssDemux, gst_mss_demux, GST_TYPE_ELEMENT); static void gst_mss_demux_dispose (GObject * object); static void gst_mss_demux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_mss_demux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static GstStateChangeReturn gst_mss_demux_change_state (GstElement * element, GstStateChange transition); static GstFlowReturn gst_mss_demux_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer); static GstFlowReturn gst_mss_demux_event (GstPad * pad, GstObject * parent, GstEvent * event); static gboolean gst_mss_demux_src_query (GstPad * pad, GstObject * parent, GstQuery * query); static void gst_mss_demux_download_loop (GstMssDemuxStream * stream); static GstFlowReturn gst_mss_demux_stream_push (GstMssDemuxStream * stream, GstBuffer * buffer); static GstFlowReturn gst_mss_demux_stream_push_event (GstMssDemuxStream * stream, GstEvent * event); static GstFlowReturn gst_mss_demux_combine_flows (GstMssDemux * mssdemux); static gboolean gst_mss_demux_process_manifest (GstMssDemux * mssdemux); static void gst_mss_demux_stop_tasks (GstMssDemux * mssdemux, gboolean immediate); static void gst_mss_demux_class_init (GstMssDemuxClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&gst_mss_demux_sink_template)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&gst_mss_demux_videosrc_template)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&gst_mss_demux_audiosrc_template)); gst_element_class_set_static_metadata (gstelement_class, "Smooth Streaming demuxer", "Codec/Demuxer/Adaptive", "Parse and demultiplex a Smooth Streaming manifest into audio and video " "streams", "Thiago Santos "); gobject_class->dispose = gst_mss_demux_dispose; gobject_class->set_property = gst_mss_demux_set_property; gobject_class->get_property = gst_mss_demux_get_property; g_object_class_install_property (gobject_class, PROP_CONNECTION_SPEED, g_param_spec_uint ("connection-speed", "Connection Speed", "Network connection speed in kbps (0 = unknown)", 0, G_MAXUINT / 1000, DEFAULT_CONNECTION_SPEED, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_MAX_QUEUE_SIZE_BUFFERS, g_param_spec_uint ("max-queue-size-buffers", "Max queue size in buffers", "Maximum buffers that can be stored in each internal stream queue " "(0 = infinite)", 0, G_MAXUINT, DEFAULT_MAX_QUEUE_SIZE_BUFFERS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_BITRATE_LIMIT, g_param_spec_float ("bitrate-limit", "Bitrate limit in %", "Limit of the available bitrate to use when switching to alternates.", 0, 1, DEFAULT_BITRATE_LIMIT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_mss_demux_change_state); GST_DEBUG_CATEGORY_INIT (mssdemux_debug, "mssdemux", 0, "mssdemux plugin"); } static void gst_mss_demux_init (GstMssDemux * mssdemux) { mssdemux->sinkpad = gst_pad_new_from_static_template (&gst_mss_demux_sink_template, "sink"); gst_pad_set_chain_function (mssdemux->sinkpad, GST_DEBUG_FUNCPTR (gst_mss_demux_chain)); gst_pad_set_event_function (mssdemux->sinkpad, GST_DEBUG_FUNCPTR (gst_mss_demux_event)); gst_element_add_pad (GST_ELEMENT_CAST (mssdemux), mssdemux->sinkpad); mssdemux->data_queue_max_size = DEFAULT_MAX_QUEUE_SIZE_BUFFERS; mssdemux->bitrate_limit = DEFAULT_BITRATE_LIMIT; mssdemux->have_group_id = FALSE; mssdemux->group_id = G_MAXUINT; } static GstMssDemuxStream * gst_mss_demux_stream_new (GstMssDemux * mssdemux, GstMssStream * manifeststream, GstPad * srcpad) { GstMssDemuxStream *stream; stream = g_new0 (GstMssDemuxStream, 1); stream->downloader = gst_uri_downloader_new (); /* Downloading task */ g_rec_mutex_init (&stream->download_lock); stream->download_task = gst_task_new ((GstTaskFunction) gst_mss_demux_download_loop, stream, NULL); gst_task_set_lock (stream->download_task, &stream->download_lock); stream->pad = srcpad; stream->manifest_stream = manifeststream; stream->parent = mssdemux; gst_download_rate_init (&stream->download_rate); gst_download_rate_set_max_length (&stream->download_rate, DOWNLOAD_RATE_MAX_HISTORY_LENGTH); gst_segment_init (&stream->segment, GST_FORMAT_TIME); return stream; } static void gst_mss_demux_stream_free (GstMssDemuxStream * stream) { if (stream->download_task) { if (GST_TASK_STATE (stream->download_task) != GST_TASK_STOPPED) { GST_DEBUG_OBJECT (stream->parent, "Leaving streaming task %s:%s", GST_DEBUG_PAD_NAME (stream->pad)); gst_uri_downloader_cancel (stream->downloader); gst_task_stop (stream->download_task); GST_LOG_OBJECT (stream->parent, "Waiting for task to finish"); gst_task_join (stream->download_task); GST_LOG_OBJECT (stream->parent, "Finished"); } gst_object_unref (stream->download_task); g_rec_mutex_clear (&stream->download_lock); stream->download_task = NULL; } gst_download_rate_deinit (&stream->download_rate); if (stream->pending_newsegment) { gst_event_unref (stream->pending_newsegment); stream->pending_newsegment = NULL; } if (stream->downloader != NULL) { g_object_unref (stream->downloader); stream->downloader = NULL; } if (stream->pad) { gst_object_unref (stream->pad); stream->pad = NULL; } if (stream->caps) gst_caps_unref (stream->caps); g_free (stream); } static void gst_mss_demux_reset (GstMssDemux * mssdemux) { GSList *iter; gst_mss_demux_stop_tasks (mssdemux, TRUE); if (mssdemux->manifest_buffer) { gst_buffer_unref (mssdemux->manifest_buffer); mssdemux->manifest_buffer = NULL; } for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) { GstMssDemuxStream *stream = iter->data; if (stream->pad) gst_element_remove_pad (GST_ELEMENT_CAST (mssdemux), stream->pad); gst_mss_demux_stream_free (stream); } g_slist_free (mssdemux->streams); mssdemux->streams = NULL; if (mssdemux->manifest) { gst_mss_manifest_free (mssdemux->manifest); mssdemux->manifest = NULL; } mssdemux->n_videos = mssdemux->n_audios = 0; g_free (mssdemux->base_url); mssdemux->base_url = NULL; g_free (mssdemux->manifest_uri); mssdemux->manifest_uri = NULL; mssdemux->have_group_id = FALSE; mssdemux->group_id = G_MAXUINT; } static void gst_mss_demux_dispose (GObject * object) { GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (object); gst_mss_demux_reset (mssdemux); G_OBJECT_CLASS (parent_class)->dispose (object); } static void gst_mss_demux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstMssDemux *mssdemux = GST_MSS_DEMUX (object); switch (prop_id) { case PROP_CONNECTION_SPEED: GST_OBJECT_LOCK (mssdemux); mssdemux->connection_speed = g_value_get_uint (value) * 1000; mssdemux->update_bitrates = TRUE; GST_DEBUG_OBJECT (mssdemux, "Connection speed set to %" G_GUINT64_FORMAT, mssdemux->connection_speed); GST_OBJECT_UNLOCK (mssdemux); break; case PROP_MAX_QUEUE_SIZE_BUFFERS: mssdemux->data_queue_max_size = g_value_get_uint (value); break; case PROP_BITRATE_LIMIT: mssdemux->bitrate_limit = g_value_get_float (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_mss_demux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstMssDemux *mssdemux = GST_MSS_DEMUX (object); switch (prop_id) { case PROP_CONNECTION_SPEED: g_value_set_uint (value, mssdemux->connection_speed / 1000); break; case PROP_MAX_QUEUE_SIZE_BUFFERS: g_value_set_uint (value, mssdemux->data_queue_max_size); break; case PROP_BITRATE_LIMIT: g_value_set_float (value, mssdemux->bitrate_limit); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstStateChangeReturn gst_mss_demux_change_state (GstElement * element, GstStateChange transition) { GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (element); GstStateChangeReturn result = GST_STATE_CHANGE_FAILURE; switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: gst_mss_demux_reset (mssdemux); break; case GST_STATE_CHANGE_READY_TO_NULL: break; default: break; } result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); return result; } static GstFlowReturn gst_mss_demux_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer) { GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (parent); if (mssdemux->manifest_buffer == NULL) mssdemux->manifest_buffer = buffer; else mssdemux->manifest_buffer = gst_buffer_append (mssdemux->manifest_buffer, buffer); GST_INFO_OBJECT (mssdemux, "Received manifest buffer, total size is %i bytes", (gint) gst_buffer_get_size (mssdemux->manifest_buffer)); return GST_FLOW_OK; } static void gst_mss_demux_start (GstMssDemux * mssdemux) { GSList *iter; GST_INFO_OBJECT (mssdemux, "Starting streams' tasks"); for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) { GstMssDemuxStream *stream = iter->data; gst_task_start (stream->download_task); } } static gboolean gst_mss_demux_push_src_event (GstMssDemux * mssdemux, GstEvent * event) { GSList *iter; gboolean ret = TRUE; for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) { GstMssDemuxStream *stream = iter->data; gst_event_ref (event); ret = ret & gst_pad_push_event (stream->pad, event); } gst_event_unref (event); return ret; } static gboolean gst_mss_demux_event (GstPad * pad, GstObject * parent, GstEvent * event) { GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (parent); gboolean forward = TRUE; gboolean ret = TRUE; switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_STOP: gst_mss_demux_reset (mssdemux); break; case GST_EVENT_EOS: if (mssdemux->manifest_buffer == NULL) { GST_WARNING_OBJECT (mssdemux, "Received EOS without a manifest."); break; } GST_INFO_OBJECT (mssdemux, "Received EOS"); if (gst_mss_demux_process_manifest (mssdemux)) gst_mss_demux_start (mssdemux); forward = FALSE; break; default: break; } if (forward) { ret = gst_pad_event_default (pad, parent, event); } else { gst_event_unref (event); } return ret; } static void gst_mss_demux_stop_tasks (GstMssDemux * mssdemux, gboolean immediate) { GSList *iter; GST_OBJECT_LOCK (mssdemux); for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) { GstMssDemuxStream *stream = iter->data; gst_task_stop (stream->download_task); stream->cancelled = TRUE; if (immediate) gst_uri_downloader_cancel (stream->downloader); } GST_OBJECT_UNLOCK (mssdemux); for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) { GstMssDemuxStream *stream = iter->data; gst_task_join (stream->download_task); stream->download_error_count = 0; } } static void gst_mss_demux_restart_tasks (GstMssDemux * mssdemux) { GSList *iter; for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) { GstMssDemuxStream *stream = iter->data; gst_uri_downloader_reset (stream->downloader); stream->cancelled = FALSE; gst_task_start (stream->download_task); } } static gboolean gst_mss_demux_src_event (GstPad * pad, GstObject * parent, GstEvent * event) { GstMssDemux *mssdemux; mssdemux = GST_MSS_DEMUX_CAST (parent); switch (event->type) { case GST_EVENT_SEEK: { gdouble rate; GstFormat format; GstSeekFlags flags; GstSeekType start_type, stop_type; gint64 start, stop; GstEvent *newsegment; GSList *iter; gboolean update; GST_INFO_OBJECT (mssdemux, "Received GST_EVENT_SEEK"); gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start, &stop_type, &stop); if (format != GST_FORMAT_TIME) goto not_supported; GST_DEBUG_OBJECT (mssdemux, "seek event, rate: %f start: %" GST_TIME_FORMAT " stop: %" GST_TIME_FORMAT, rate, GST_TIME_ARGS (start), GST_TIME_ARGS (stop)); if (flags & GST_SEEK_FLAG_FLUSH) { GstEvent *flush = gst_event_new_flush_start (); GST_DEBUG_OBJECT (mssdemux, "sending flush start"); gst_event_set_seqnum (flush, gst_event_get_seqnum (event)); gst_mss_demux_push_src_event (mssdemux, flush); } gst_mss_demux_stop_tasks (mssdemux, TRUE); if (!gst_mss_manifest_seek (mssdemux->manifest, start)) {; GST_WARNING_OBJECT (mssdemux, "Could not find seeked fragment"); goto not_supported; } for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) { GstMssDemuxStream *stream = iter->data; stream->eos = FALSE; if (flags & GST_SEEK_FLAG_FLUSH) { stream->last_ret = GST_FLOW_OK; } gst_segment_do_seek (&stream->segment, rate, format, flags, start_type, start, stop_type, stop, &update); newsegment = gst_event_new_segment (&stream->segment); gst_event_set_seqnum (newsegment, gst_event_get_seqnum (event)); if (stream->pending_newsegment) gst_event_unref (stream->pending_newsegment); stream->pending_newsegment = newsegment; } if (flags & GST_SEEK_FLAG_FLUSH) { GstEvent *flush = gst_event_new_flush_stop (TRUE); GST_DEBUG_OBJECT (mssdemux, "sending flush stop"); gst_event_set_seqnum (flush, gst_event_get_seqnum (event)); gst_mss_demux_push_src_event (mssdemux, flush); } gst_mss_demux_restart_tasks (mssdemux); gst_event_unref (event); return TRUE; } case GST_EVENT_RECONFIGURE:{ GSList *iter; for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) { GstMssDemuxStream *stream = iter->data; if (stream->pad == pad) { GST_OBJECT_LOCK (mssdemux); if (stream->last_ret == GST_FLOW_NOT_LINKED) { GST_DEBUG_OBJECT (stream->pad, "Received reconfigure"); stream->restart_download = TRUE; gst_task_start (stream->download_task); } GST_OBJECT_UNLOCK (mssdemux); gst_event_unref (event); return TRUE; } } } break; default: break; } return gst_pad_event_default (pad, parent, event); not_supported: gst_event_unref (event); return FALSE; } static gboolean gst_mss_demux_src_query (GstPad * pad, GstObject * parent, GstQuery * query) { GstMssDemux *mssdemux; gboolean ret = FALSE; if (query == NULL) return FALSE; mssdemux = GST_MSS_DEMUX (parent); switch (query->type) { case GST_QUERY_DURATION:{ GstClockTime duration = -1; GstFormat fmt; gst_query_parse_duration (query, &fmt, NULL); if (fmt == GST_FORMAT_TIME && mssdemux->manifest) { /* TODO should we use the streams accumulated duration or the main manifest duration? */ duration = gst_mss_manifest_get_gst_duration (mssdemux->manifest); if (GST_CLOCK_TIME_IS_VALID (duration) && duration > 0) { gst_query_set_duration (query, GST_FORMAT_TIME, duration); ret = TRUE; } } GST_INFO_OBJECT (mssdemux, "GST_QUERY_DURATION returns %s with duration %" GST_TIME_FORMAT, ret ? "TRUE" : "FALSE", GST_TIME_ARGS (duration)); break; } case GST_QUERY_LATENCY:{ gboolean live = FALSE; live = mssdemux->manifest && gst_mss_manifest_is_live (mssdemux->manifest); gst_query_set_latency (query, live, 0, -1); ret = TRUE; break; } case GST_QUERY_SEEKING:{ GstFormat fmt; gint64 stop = -1; if (mssdemux->manifest && gst_mss_manifest_is_live (mssdemux->manifest)) { return FALSE; /* no live seeking */ } gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL); GST_INFO_OBJECT (mssdemux, "Received GST_QUERY_SEEKING with format %d", fmt); if (fmt == GST_FORMAT_TIME) { GstClockTime duration; duration = gst_mss_manifest_get_gst_duration (mssdemux->manifest); if (GST_CLOCK_TIME_IS_VALID (duration) && duration > 0) stop = duration; gst_query_set_seeking (query, fmt, TRUE, 0, stop); ret = TRUE; GST_INFO_OBJECT (mssdemux, "GST_QUERY_SEEKING returning with stop : %" GST_TIME_FORMAT, GST_TIME_ARGS (stop)); } break; } default: /* Don't fordward queries upstream because of the special nature of this * "demuxer", which relies on the upstream element only to be fed * the Manifest */ break; } return ret; } static void _set_src_pad_functions (GstPad * pad) { gst_pad_set_query_function (pad, GST_DEBUG_FUNCPTR (gst_mss_demux_src_query)); gst_pad_set_event_function (pad, GST_DEBUG_FUNCPTR (gst_mss_demux_src_event)); } static GstPad * _create_pad (GstMssDemux * mssdemux, GstMssStream * manifeststream) { gchar *name; GstPad *srcpad = NULL; GstMssStreamType streamtype; streamtype = gst_mss_stream_get_type (manifeststream); GST_DEBUG_OBJECT (mssdemux, "Found stream of type: %s", gst_mss_stream_type_name (streamtype)); /* TODO use stream's name/bitrate/index as the pad name? */ if (streamtype == MSS_STREAM_TYPE_VIDEO) { name = g_strdup_printf ("video_%02u", mssdemux->n_videos++); srcpad = gst_pad_new_from_static_template (&gst_mss_demux_videosrc_template, name); g_free (name); } else if (streamtype == MSS_STREAM_TYPE_AUDIO) { name = g_strdup_printf ("audio_%02u", mssdemux->n_audios++); srcpad = gst_pad_new_from_static_template (&gst_mss_demux_audiosrc_template, name); g_free (name); } if (!srcpad) { GST_WARNING_OBJECT (mssdemux, "Ignoring unknown type stream"); return NULL; } _set_src_pad_functions (srcpad); return srcpad; } static void gst_mss_demux_create_streams (GstMssDemux * mssdemux) { GSList *streams = gst_mss_manifest_get_streams (mssdemux->manifest); GSList *iter; if (streams == NULL) { GST_INFO_OBJECT (mssdemux, "No streams found in the manifest"); GST_ELEMENT_ERROR (mssdemux, STREAM, DEMUX, (_("This file contains no playable streams.")), ("no streams found at the Manifest")); return; } for (iter = streams; iter; iter = g_slist_next (iter)) { GstPad *srcpad = NULL; GstMssDemuxStream *stream = NULL; GstMssStream *manifeststream = iter->data; srcpad = _create_pad (mssdemux, manifeststream); if (!srcpad) { continue; } stream = gst_mss_demux_stream_new (mssdemux, manifeststream, srcpad); gst_mss_stream_set_active (manifeststream, TRUE); mssdemux->streams = g_slist_append (mssdemux->streams, stream); } /* select initial bitrates */ GST_OBJECT_LOCK (mssdemux); GST_INFO_OBJECT (mssdemux, "Changing max bitrate to %" G_GUINT64_FORMAT, mssdemux->connection_speed); gst_mss_manifest_change_bitrate (mssdemux->manifest, mssdemux->connection_speed); mssdemux->update_bitrates = FALSE; GST_OBJECT_UNLOCK (mssdemux); } static GstCaps * create_mss_caps (GstMssDemuxStream * stream, GstCaps * caps) { return gst_caps_new_simple ("video/quicktime", "variant", G_TYPE_STRING, "mss-fragmented", "timescale", G_TYPE_UINT64, gst_mss_stream_get_timescale (stream->manifest_stream), "media-caps", GST_TYPE_CAPS, caps, NULL); } static gboolean gst_mss_demux_expose_stream (GstMssDemux * mssdemux, GstMssDemuxStream * stream) { GstCaps *caps; GstCaps *media_caps; GstPad *pad = stream->pad; media_caps = gst_mss_stream_get_caps (stream->manifest_stream); if (media_caps) { gchar *name = gst_pad_get_name (pad); const gchar *lang; GstEvent *event; gchar *stream_id; gst_pad_set_active (pad, TRUE); caps = create_mss_caps (stream, media_caps); gst_caps_unref (media_caps); stream_id = gst_pad_create_stream_id (pad, GST_ELEMENT_CAST (mssdemux), name); event = gst_pad_get_sticky_event (mssdemux->sinkpad, GST_EVENT_STREAM_START, 0); if (event) { if (gst_event_parse_group_id (event, &mssdemux->group_id)) mssdemux->have_group_id = TRUE; else mssdemux->have_group_id = FALSE; gst_event_unref (event); } else if (!mssdemux->have_group_id) { mssdemux->have_group_id = TRUE; mssdemux->group_id = gst_util_group_id_next (); } event = gst_event_new_stream_start (stream_id); if (mssdemux->have_group_id) gst_event_set_group_id (event, mssdemux->group_id); gst_pad_push_event (pad, event); g_free (stream_id); g_free (name); gst_pad_set_caps (pad, caps); stream->caps = caps; lang = gst_mss_stream_get_lang (stream->manifest_stream); if (lang != NULL) { GstTagList *tags; tags = gst_tag_list_new (GST_TAG_LANGUAGE_CODE, lang, NULL); gst_pad_push_event (stream->pad, gst_event_new_tag (tags)); } gst_pad_push_event (stream->pad, gst_event_new_segment (&stream->segment)); GST_INFO_OBJECT (mssdemux, "Adding srcpad %s:%s with caps %" GST_PTR_FORMAT, GST_DEBUG_PAD_NAME (pad), caps); gst_object_ref (pad); gst_element_add_pad (GST_ELEMENT_CAST (mssdemux), pad); } else { GST_WARNING_OBJECT (mssdemux, "Couldn't get caps from manifest stream %p %s, not exposing it", stream, GST_PAD_NAME (stream->pad)); return FALSE; } return TRUE; } static gboolean gst_mss_demux_process_manifest (GstMssDemux * mssdemux) { GstQuery *query; gchar *uri = NULL; gboolean ret; GSList *iter; g_return_val_if_fail (mssdemux->manifest_buffer != NULL, FALSE); g_return_val_if_fail (mssdemux->manifest == NULL, FALSE); query = gst_query_new_uri (); ret = gst_pad_peer_query (mssdemux->sinkpad, query); if (ret) { gchar *baseurl_end; gst_query_parse_uri (query, &uri); GST_INFO_OBJECT (mssdemux, "Upstream is using URI: %s", uri); mssdemux->manifest_uri = g_strdup (uri); baseurl_end = g_strrstr (uri, "/Manifest"); if (baseurl_end == NULL) { /* second try */ baseurl_end = g_strrstr (uri, "/manifest"); } if (baseurl_end) { /* set the new end of the string */ baseurl_end[0] = '\0'; } else { GST_WARNING_OBJECT (mssdemux, "Stream's URI didn't end with /manifest"); } mssdemux->base_url = uri; } gst_query_unref (query); if (mssdemux->base_url == NULL) { GST_ELEMENT_ERROR (mssdemux, RESOURCE, NOT_FOUND, (_("Couldn't get the Manifest's URI")), ("need to get the manifest's URI from upstream elements")); return FALSE; } GST_INFO_OBJECT (mssdemux, "Received manifest: %i bytes", (gint) gst_buffer_get_size (mssdemux->manifest_buffer)); mssdemux->manifest = gst_mss_manifest_new (mssdemux->manifest_buffer); if (!mssdemux->manifest) { GST_ELEMENT_ERROR (mssdemux, STREAM, FORMAT, ("Bad manifest file"), ("Xml manifest file couldn't be parsed")); return FALSE; } GST_INFO_OBJECT (mssdemux, "Live stream: %d", gst_mss_manifest_is_live (mssdemux->manifest)); gst_mss_demux_create_streams (mssdemux); for (iter = mssdemux->streams; iter;) { GSList *current = iter; GstMssDemuxStream *stream = iter->data; iter = g_slist_next (iter); /* do it ourselves as we want it done in the beginning of the loop */ if (!gst_mss_demux_expose_stream (mssdemux, stream)) { gst_mss_demux_stream_free (stream); mssdemux->streams = g_slist_delete_link (mssdemux->streams, current); } } if (!mssdemux->streams) { /* no streams */ GST_WARNING_OBJECT (mssdemux, "Couldn't identify the caps for any of the " "streams found in the manifest"); GST_ELEMENT_ERROR (mssdemux, STREAM, DEMUX, (_("This file contains no playable streams.")), ("No known stream formats found at the Manifest")); return FALSE; } gst_element_no_more_pads (GST_ELEMENT_CAST (mssdemux)); return TRUE; } static void gst_mss_demux_reload_manifest (GstMssDemux * mssdemux) { GstUriDownloader *downloader; GstFragment *manifest_data; GstBuffer *manifest_buffer; downloader = gst_uri_downloader_new (); manifest_data = gst_uri_downloader_fetch_uri (downloader, mssdemux->manifest_uri, TRUE, NULL); manifest_buffer = gst_fragment_get_buffer (manifest_data); g_object_unref (manifest_data); gst_mss_manifest_reload_fragments (mssdemux->manifest, manifest_buffer); gst_buffer_replace (&mssdemux->manifest_buffer, manifest_buffer); gst_buffer_unref (manifest_buffer); g_object_unref (downloader); } static GstEvent * gst_mss_demux_reconfigure_stream (GstMssDemuxStream * stream) { GstEvent *capsevent = NULL; GstMssDemux *mssdemux = stream->parent; guint64 new_bitrate; new_bitrate = mssdemux->bitrate_limit * gst_download_rate_get_current_rate (&stream->download_rate); if (mssdemux->connection_speed) { new_bitrate = MIN (mssdemux->connection_speed, new_bitrate); } GST_DEBUG_OBJECT (stream->pad, "Current stream download bitrate %" G_GUINT64_FORMAT, new_bitrate); if (gst_mss_stream_select_bitrate (stream->manifest_stream, new_bitrate)) { GstCaps *caps; caps = gst_mss_stream_get_caps (stream->manifest_stream); GST_DEBUG_OBJECT (stream->pad, "Starting streams reconfiguration due to bitrate changes"); if (stream->caps) gst_caps_unref (stream->caps); stream->caps = create_mss_caps (stream, caps); gst_caps_unref (caps); GST_DEBUG_OBJECT (stream->pad, "Stream changed bitrate to %" G_GUINT64_FORMAT " caps: %" GST_PTR_FORMAT, gst_mss_stream_get_current_bitrate (stream->manifest_stream), caps); capsevent = gst_event_new_caps (stream->caps); GST_DEBUG_OBJECT (stream->pad, "Finished streams reconfiguration"); } return capsevent; } static GstFlowReturn gst_mss_demux_stream_download_fragment (GstMssDemuxStream * stream, GstBuffer ** _buffer) { GstMssDemux *mssdemux = stream->parent; gchar *path; gchar *url; GstFragment *fragment; GstBuffer *buffer; GstFlowReturn ret = GST_FLOW_OK; guint64 before_download, after_download; /* special case for not-linked streams */ if (stream->last_ret == GST_FLOW_NOT_LINKED) { GST_DEBUG_OBJECT (stream->pad, "Skipping download for not-linked stream %p", stream); return GST_FLOW_NOT_LINKED; } before_download = g_get_real_time (); GST_DEBUG_OBJECT (stream->pad, "Getting url for stream"); ret = gst_mss_stream_get_fragment_url (stream->manifest_stream, &path); switch (ret) { case GST_FLOW_OK: break; /* all is good, let's go */ case GST_FLOW_EOS: if (gst_mss_manifest_is_live (mssdemux->manifest)) { gst_mss_demux_reload_manifest (mssdemux); return GST_FLOW_OK; } return GST_FLOW_EOS; case GST_FLOW_ERROR: goto error; default: break; } if (!path) { goto no_url_error; } GST_DEBUG_OBJECT (mssdemux, "Got url path '%s' for stream %p", path, stream); url = g_strdup_printf ("%s/%s", mssdemux->base_url, path); GST_DEBUG_OBJECT (mssdemux, "Got url '%s' for stream %p", url, stream); fragment = gst_uri_downloader_fetch_uri (stream->downloader, url, FALSE, NULL); g_free (path); g_free (url); if (!fragment) { GST_INFO_OBJECT (mssdemux, "No fragment downloaded"); /* TODO check if we are truly stoping */ if (gst_mss_manifest_is_live (mssdemux->manifest)) { /* looks like there is no way of knowing when a live stream has ended * Have to assume we are falling behind and cause a manifest reload */ return GST_FLOW_OK; } return GST_FLOW_ERROR; } buffer = gst_fragment_get_buffer (fragment); *_buffer = buffer = gst_buffer_make_writable (buffer); GST_BUFFER_TIMESTAMP (buffer) = gst_mss_stream_get_fragment_gst_timestamp (stream->manifest_stream); GST_BUFFER_DURATION (buffer) = gst_mss_stream_get_fragment_gst_duration (stream->manifest_stream); g_object_unref (fragment); after_download = g_get_real_time (); if (_buffer) { #ifndef GST_DISABLE_GST_DEBUG guint64 bitrate = (8 * gst_buffer_get_size (buffer) * 1000000LLU) / (after_download - before_download); #endif GST_DEBUG_OBJECT (mssdemux, "Measured download bitrate: %s %" G_GUINT64_FORMAT " bps", GST_PAD_NAME (stream->pad), bitrate); gst_download_rate_add_rate (&stream->download_rate, gst_buffer_get_size (buffer), 1000 * (after_download - before_download)); } return ret; no_url_error: { GST_ELEMENT_ERROR (mssdemux, STREAM, DEMUX, (_("Failed to get fragment URL.")), ("An error happened when getting fragment URL")); gst_task_pause (stream->download_task); return GST_FLOW_ERROR; } error: { GST_WARNING_OBJECT (mssdemux, "Error while pushing fragment"); gst_task_pause (stream->download_task); return GST_FLOW_ERROR; } } static void gst_mss_demux_download_loop (GstMssDemuxStream * stream) { GstMssDemux *mssdemux = stream->parent; GstFlowReturn ret; GstBuffer *buffer = NULL; gboolean buffer_downloaded = FALSE; GstEvent *gap = NULL; GstEvent *capsevent = NULL; GST_LOG_OBJECT (stream->pad, "download loop start"); GST_OBJECT_LOCK (mssdemux); if (G_UNLIKELY (stream->restart_download)) { GstClockTime cur, ts; gint64 pos; GST_DEBUG_OBJECT (stream->pad, "Activating stream due to reconfigure event"); cur = GST_CLOCK_TIME_IS_VALID (stream->next_timestamp) ? stream->next_timestamp : 0; if (gst_pad_peer_query_position (stream->pad, GST_FORMAT_TIME, &pos)) { ts = (GstClockTime) pos; GST_DEBUG_OBJECT (mssdemux, "Downstream position: %" GST_TIME_FORMAT, GST_TIME_ARGS (ts)); } else { GST_DEBUG_OBJECT (mssdemux, "Downstream position query failed, " "failling back to segment position"); ts = stream->segment.position; } /* we might have already pushed this data */ ts = MAX (ts, stream->next_timestamp); GST_DEBUG_OBJECT (stream->pad, "Restarting stream at " "position %" GST_TIME_FORMAT, GST_TIME_ARGS (ts)); if (GST_CLOCK_TIME_IS_VALID (ts)) { gst_mss_stream_seek (stream->manifest_stream, ts); if (cur < ts) { gap = gst_event_new_gap (cur, ts - cur); } } stream->restart_download = FALSE; stream->last_ret = GST_FLOW_OK; } capsevent = gst_mss_demux_reconfigure_stream (stream); GST_OBJECT_UNLOCK (mssdemux); if (G_UNLIKELY (gap != NULL)) gst_pad_push_event (stream->pad, gap); if (G_UNLIKELY (capsevent != NULL)) gst_pad_push_event (stream->pad, capsevent); ret = gst_mss_demux_stream_download_fragment (stream, &buffer); buffer_downloaded = buffer != NULL; GST_OBJECT_LOCK (mssdemux); if (stream->cancelled) { if (buffer) gst_buffer_unref (buffer); GST_OBJECT_UNLOCK (mssdemux); goto cancelled; } GST_OBJECT_UNLOCK (mssdemux); if (buffer) { ret = gst_mss_demux_stream_push (stream, buffer); } GST_OBJECT_LOCK (mssdemux); stream->last_ret = ret; if (stream->cancelled) { GST_OBJECT_UNLOCK (mssdemux); goto cancelled; } switch (ret) { case GST_FLOW_OK: break; /* all is good, let's go */ case GST_FLOW_EOS: GST_DEBUG_OBJECT (stream->pad, "EOS, stopping download loop"); /* we push the EOS after releasing the object lock */ gst_task_pause (stream->download_task); break; case GST_FLOW_NOT_LINKED: gst_task_pause (stream->download_task); if (gst_mss_demux_combine_flows (mssdemux) == GST_FLOW_NOT_LINKED) { GST_ELEMENT_ERROR (mssdemux, STREAM, FAILED, (_("Internal data stream error.")), ("stream stopped, reason %s", gst_flow_get_name (GST_FLOW_NOT_LINKED))); } break; case GST_FLOW_FLUSHING:{ GSList *iter; for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) { GstMssDemuxStream *other; other = iter->data; gst_task_pause (other->download_task); } } break; default: if (ret <= GST_FLOW_ERROR) { if (buffer_downloaded) { GST_ERROR_OBJECT (mssdemux, "Error while pushing fragment"); } else { GST_WARNING_OBJECT (mssdemux, "Error while downloading fragment"); if (++stream->download_error_count >= DOWNLOAD_RATE_MAX_HISTORY_LENGTH) { GST_ELEMENT_ERROR (mssdemux, RESOURCE, NOT_FOUND, (_("Couldn't download fragments")), ("fragment downloading has failed too much consecutive times")); } } } break; } GST_OBJECT_UNLOCK (mssdemux); if (G_UNLIKELY (ret == GST_FLOW_EOS)) { gst_mss_demux_stream_push_event (stream, gst_event_new_eos ()); } if (buffer_downloaded) { stream->download_error_count = 0; gst_mss_stream_advance_fragment (stream->manifest_stream); } GST_LOG_OBJECT (stream->pad, "download loop end"); return; cancelled: { GST_DEBUG_OBJECT (stream->pad, "Stream has been cancelled"); return; } } static GstFlowReturn gst_mss_demux_combine_flows (GstMssDemux * mssdemux) { gboolean all_notlinked = TRUE; GSList *iter; for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) { GstMssDemuxStream *stream = iter->data; if (stream->last_ret != GST_FLOW_NOT_LINKED) all_notlinked = FALSE; if (stream->last_ret <= GST_FLOW_NOT_NEGOTIATED || stream->last_ret == GST_FLOW_FLUSHING) return stream->last_ret; } if (all_notlinked) return GST_FLOW_NOT_LINKED; return GST_FLOW_OK; } static gboolean gst_mss_demux_stream_push (GstMssDemuxStream * stream, GstBuffer * buf) { GstFlowReturn ret; if (G_UNLIKELY (stream->pending_newsegment)) { gst_pad_push_event (stream->pad, stream->pending_newsegment); stream->pending_newsegment = NULL; } if (GST_BUFFER_TIMESTAMP (buf) != stream->next_timestamp) { GST_DEBUG_OBJECT (stream->pad, "Marking buffer %p as discont buffer:%" GST_TIME_FORMAT " != expected:%" GST_TIME_FORMAT, buf, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)), GST_TIME_ARGS (stream->next_timestamp)); GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT); } GST_DEBUG_OBJECT (stream->pad, "Pushing buffer %p %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT " discont:%d", buf, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)), GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DISCONT)); stream->next_timestamp = GST_BUFFER_TIMESTAMP (buf) + GST_BUFFER_DURATION (buf); stream->have_data = TRUE; stream->segment.position = GST_BUFFER_TIMESTAMP (buf); ret = gst_pad_push (stream->pad, GST_BUFFER_CAST (buf)); GST_DEBUG_OBJECT (stream->pad, "Pushed. result: %d (%s)", ret, gst_flow_get_name (ret)); return ret; } static gboolean gst_mss_demux_stream_push_event (GstMssDemuxStream * stream, GstEvent * event) { gboolean ret; if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) { stream->eos = TRUE; } GST_DEBUG_OBJECT (stream->pad, "Pushing event %" GST_PTR_FORMAT, event); ret = gst_pad_push_event (stream->pad, event); return ret; }