/* * DASH demux plugin for GStreamer * * gstdashdemux.c * * Copyright (C) 2012 Orange * * Authors: * David Corvoysier * Hamid Zakari * * Copyright (C) 2013 Smart TV Alliance * Author: Thiago Sousa Santos , Collabora Ltd. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2.1 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 (COPYING); if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:element-dashdemux * * DASH demuxer element. * Example launch line * |[ * gst-launch playbin2 uri="http://www-itec.uni-klu.ac.at/ftp/datasets/mmsys12/RedBullPlayStreets/redbull_4s/RedBullPlayStreets_4s_isoffmain_DIS_23009_1_v_2_1c2_2011_08_30.mpd" * ]| */ /* Implementation notes: * * The following section describes how dashdemux works internally. * * Introduction: * * dashdemux is a "fake" demux, as unlike traditional demux elements, it * doesn't split data streams contained in an enveloppe to expose them * to downstream decoding elements. * * Instead, it parses an XML file called a manifest to identify a set of * individual stream fragments it needs to fetch and expose to the actual * demux elements that will handle them (this behavior is sometimes * referred as the "demux after a demux" scenario). * * For a given section of content, several representations corresponding * to different bitrates may be available: dashdemux will select the most * appropriate representation based on local conditions (typically the * available bandwidth and the amount of buffering available, capped by * a maximum allowed bitrate). * * The representation selection algorithm can be configured using * specific properties: max bitrate, min/max buffering, bandwidth ratio. * * * General Design: * * dashdemux has a single sink pad that accepts the data corresponding * to the manifest, typically fetched from an HTTP or file source. * * dashdemux exposes the streams it recreates based on the fragments it * fetches through dedicated src pads corresponding to the caps of the * fragments container (ISOBMFF/MP4 or MPEG2TS). * * During playback, new representations will typically be exposed as a * new set of pads (see 'Switching between representations' below). * * Fragments downloading is performed using a dedicated task that fills * an internal queue. Another task is in charge of popping fragments * from the queue and pushing them downstream. * * Switching between representations: * * Decodebin supports scenarios allowing to seamlessly switch from one * stream to another inside the same "decoding chain". * * To achieve that, it combines the elements it autoplugged in chains * and groups, allowing only one decoding group to be active at a given * time for a given chain. * * A chain can signal decodebin that it is complete by sending a * no-more-pads event, but even after that new pads can be added to * create new subgroups, providing that a new no-more-pads event is sent. * * We take advantage of that to dynamically create a new decoding group * in order to select a different representation during playback. * * Typically, assuming that each fragment contains both audio and video, * the following tree would be created: * * chain "DASH Demux" * |_ group "Representation set 1" * | |_ chain "Qt Demux 0" * | |_ group "Stream 0" * | |_ chain "H264" * | |_ chain "AAC" * |_ group "Representation set 2" * |_ chain "Qt Demux 1" * |_ group "Stream 1" * |_ chain "H264" * |_ chain "AAC" * * Or, if audio and video are contained in separate fragments: * * chain "DASH Demux" * |_ group "Representation set 1" * | |_ chain "Qt Demux 0" * | | |_ group "Stream 0" * | | |_ chain "H264" * | |_ chain "Qt Demux 1" * | |_ group "Stream 1" * | |_ chain "AAC" * |_ group "Representation set 2" * |_ chain "Qt Demux 3" * | |_ group "Stream 2" * | |_ chain "H264" * |_ chain "Qt Demux 4" * |_ group "Stream 3" * |_ chain "AAC" * * In both cases, when switching from Set 1 to Set 2 an EOS is sent on * each end pad corresponding to Rep 0, triggering the "drain" state to * propagate upstream. * Once both EOS have been processed, the "Set 1" group is completely * drained, and decodebin2 will switch to the "Set 2" group. * * Note: nothing can be pushed to the new decoding group before the * old one has been drained, which means that in order to be able to * adapt quickly to bandwidth changes, we will not be able to rely * on downstream buffering, and will instead manage an internal queue. * */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include "gst/gst-i18n-plugin.h" #include "gstdashdemux.h" #include "gstdash_debug.h" static GstStaticPadTemplate gst_dash_demux_videosrc_template = GST_STATIC_PAD_TEMPLATE ("video_%02u", GST_PAD_SRC, GST_PAD_SOMETIMES, GST_STATIC_CAPS_ANY); static GstStaticPadTemplate gst_dash_demux_audiosrc_template = GST_STATIC_PAD_TEMPLATE ("audio_%02u", GST_PAD_SRC, GST_PAD_SOMETIMES, GST_STATIC_CAPS_ANY); static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/dash+xml")); GST_DEBUG_CATEGORY (gst_dash_demux_debug); #define GST_CAT_DEFAULT gst_dash_demux_debug enum { PROP_0, PROP_MAX_BUFFERING_TIME, PROP_BANDWIDTH_USAGE, PROP_MAX_BITRATE, PROP_LAST }; /* Default values for properties */ #define DEFAULT_MAX_BUFFERING_TIME 30 /* in seconds */ #define DEFAULT_BANDWIDTH_USAGE 0.8 /* 0 to 1 */ #define DEFAULT_MAX_BITRATE 24000000 /* in bit/s */ /* GObject */ static void gst_dash_demux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_dash_demux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_dash_demux_dispose (GObject * obj); /* GstAdaptiveDemux */ static GstClockTime gst_dash_demux_get_duration (GstAdaptiveDemux * ademux); static gboolean gst_dash_demux_is_live (GstAdaptiveDemux * ademux); static void gst_dash_demux_reset (GstAdaptiveDemux * ademux); static gboolean gst_dash_demux_process_manifest (GstAdaptiveDemux * ademux, GstBuffer * buf); static gboolean gst_dash_demux_seek (GstAdaptiveDemux * demux, GstEvent * seek); static GstFlowReturn gst_dash_demux_stream_update_fragment_info (GstAdaptiveDemuxStream * stream); static GstFlowReturn gst_dash_demux_stream_seek (GstAdaptiveDemuxStream * stream, GstClockTime ts); static gboolean gst_dash_demux_stream_has_next_fragment (GstAdaptiveDemuxStream * stream); static GstFlowReturn gst_dash_demux_stream_advance_fragment (GstAdaptiveDemuxStream * stream); static gboolean gst_dash_demux_stream_advance_subfragment (GstAdaptiveDemuxStream * stream); static gboolean gst_dash_demux_stream_select_bitrate (GstAdaptiveDemuxStream * stream, guint64 bitrate); static gint64 gst_dash_demux_get_manifest_update_interval (GstAdaptiveDemux * demux); static GstFlowReturn gst_dash_demux_update_manifest_data (GstAdaptiveDemux * demux, GstBuffer * buf); static gint64 gst_dash_demux_stream_get_fragment_waiting_time (GstAdaptiveDemuxStream * stream); static void gst_dash_demux_advance_period (GstAdaptiveDemux * demux); static gboolean gst_dash_demux_has_next_period (GstAdaptiveDemux * demux); static GstFlowReturn gst_dash_demux_data_received (GstAdaptiveDemux * demux, GstAdaptiveDemuxStream * stream); static GstFlowReturn gst_dash_demux_stream_fragment_finished (GstAdaptiveDemux * demux, GstAdaptiveDemuxStream * stream); /* GstDashDemux */ static gboolean gst_dash_demux_setup_all_streams (GstDashDemux * demux); static void gst_dash_demux_stream_free (GstAdaptiveDemuxStream * stream); static GstCaps *gst_dash_demux_get_input_caps (GstDashDemux * demux, GstActiveStream * stream); static GstPad *gst_dash_demux_create_pad (GstDashDemux * demux, GstActiveStream * stream); #define SIDX(s) (&(s)->sidx_parser.sidx) #define SIDX_ENTRY(s,i) (&(SIDX(s)->entries[(i)])) #define SIDX_CURRENT_ENTRY(s) SIDX_ENTRY(s, SIDX(s)->entry_index) #define gst_dash_demux_parent_class parent_class G_DEFINE_TYPE_WITH_CODE (GstDashDemux, gst_dash_demux, GST_TYPE_ADAPTIVE_DEMUX, GST_DEBUG_CATEGORY_INIT (gst_dash_demux_debug, "dashdemux", 0, "dashdemux element"); ); static void gst_dash_demux_dispose (GObject * obj) { GstDashDemux *demux = GST_DASH_DEMUX (obj); gst_dash_demux_reset (GST_ADAPTIVE_DEMUX_CAST (demux)); if (demux->client) { gst_mpd_client_free (demux->client); demux->client = NULL; } g_mutex_clear (&demux->client_lock); G_OBJECT_CLASS (parent_class)->dispose (obj); } static gboolean gst_dash_demux_get_live_seek_range (GstAdaptiveDemux * demux, gint64 * start, gint64 * stop) { GstDashDemux *self = GST_DASH_DEMUX (demux); GDateTime *now = g_date_time_new_now_utc (); GDateTime *mstart = gst_date_time_to_g_date_time (self->client-> mpd_node->availabilityStartTime); GTimeSpan stream_now; stream_now = g_date_time_difference (now, mstart); g_date_time_unref (now); g_date_time_unref (mstart); *stop = stream_now * GST_USECOND; *start = *stop - (self->client->mpd_node->timeShiftBufferDepth * GST_MSECOND); return TRUE; } static GstClockTime gst_dash_demux_get_presentation_offset (GstAdaptiveDemux * demux, GstAdaptiveDemuxStream * stream) { GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream; GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux); return gst_mpd_parser_get_stream_presentation_offset (dashdemux->client, dashstream->index); } static void gst_dash_demux_class_init (GstDashDemuxClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; GstAdaptiveDemuxClass *gstadaptivedemux_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gstadaptivedemux_class = (GstAdaptiveDemuxClass *) klass; gobject_class->set_property = gst_dash_demux_set_property; gobject_class->get_property = gst_dash_demux_get_property; gobject_class->dispose = gst_dash_demux_dispose; #ifndef GST_REMOVE_DEPRECATED g_object_class_install_property (gobject_class, PROP_MAX_BUFFERING_TIME, g_param_spec_uint ("max-buffering-time", "Maximum buffering time", "Maximum number of seconds of buffer accumulated during playback" "(deprecated)", 2, G_MAXUINT, DEFAULT_MAX_BUFFERING_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_DEPRECATED)); g_object_class_install_property (gobject_class, PROP_BANDWIDTH_USAGE, g_param_spec_float ("bandwidth-usage", "Bandwidth usage [0..1]", "Percentage of the available bandwidth to use when " "selecting representations (deprecated)", 0, 1, DEFAULT_BANDWIDTH_USAGE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); #endif g_object_class_install_property (gobject_class, PROP_MAX_BITRATE, g_param_spec_uint ("max-bitrate", "Max bitrate", "Max of bitrate supported by target decoder", 1000, G_MAXUINT, DEFAULT_MAX_BITRATE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&gst_dash_demux_audiosrc_template)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&gst_dash_demux_videosrc_template)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&sinktemplate)); gst_element_class_set_static_metadata (gstelement_class, "DASH Demuxer", "Codec/Demuxer/Adaptive", "Dynamic Adaptive Streaming over HTTP demuxer", "David Corvoysier \n\ Hamid Zakari \n\ Gianluca Gennari "); gstadaptivedemux_class->get_duration = gst_dash_demux_get_duration; gstadaptivedemux_class->is_live = gst_dash_demux_is_live; gstadaptivedemux_class->reset = gst_dash_demux_reset; gstadaptivedemux_class->seek = gst_dash_demux_seek; gstadaptivedemux_class->process_manifest = gst_dash_demux_process_manifest; gstadaptivedemux_class->update_manifest_data = gst_dash_demux_update_manifest_data; gstadaptivedemux_class->get_manifest_update_interval = gst_dash_demux_get_manifest_update_interval; gstadaptivedemux_class->has_next_period = gst_dash_demux_has_next_period; gstadaptivedemux_class->advance_period = gst_dash_demux_advance_period; gstadaptivedemux_class->stream_has_next_fragment = gst_dash_demux_stream_has_next_fragment; gstadaptivedemux_class->stream_advance_fragment = gst_dash_demux_stream_advance_fragment; gstadaptivedemux_class->stream_get_fragment_waiting_time = gst_dash_demux_stream_get_fragment_waiting_time; gstadaptivedemux_class->stream_seek = gst_dash_demux_stream_seek; gstadaptivedemux_class->stream_select_bitrate = gst_dash_demux_stream_select_bitrate; gstadaptivedemux_class->stream_update_fragment_info = gst_dash_demux_stream_update_fragment_info; gstadaptivedemux_class->stream_free = gst_dash_demux_stream_free; gstadaptivedemux_class->get_live_seek_range = gst_dash_demux_get_live_seek_range; gstadaptivedemux_class->get_presentation_offset = gst_dash_demux_get_presentation_offset; } static void gst_dash_demux_init (GstDashDemux * demux) { /* Properties */ demux->max_buffering_time = DEFAULT_MAX_BUFFERING_TIME * GST_SECOND; demux->max_bitrate = DEFAULT_MAX_BITRATE; g_mutex_init (&demux->client_lock); gst_adaptive_demux_set_stream_struct_size (GST_ADAPTIVE_DEMUX_CAST (demux), sizeof (GstDashDemuxStream)); } static void gst_dash_demux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstAdaptiveDemux *adaptivedemux = GST_ADAPTIVE_DEMUX_CAST (object); GstDashDemux *demux = GST_DASH_DEMUX (object); switch (prop_id) { case PROP_MAX_BUFFERING_TIME: demux->max_buffering_time = g_value_get_uint (value) * GST_SECOND; break; case PROP_BANDWIDTH_USAGE: adaptivedemux->bitrate_limit = g_value_get_float (value); break; case PROP_MAX_BITRATE: demux->max_bitrate = g_value_get_uint (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_dash_demux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstAdaptiveDemux *adaptivedemux = GST_ADAPTIVE_DEMUX_CAST (object); GstDashDemux *demux = GST_DASH_DEMUX (object); switch (prop_id) { case PROP_MAX_BUFFERING_TIME: g_value_set_uint (value, demux->max_buffering_time / GST_SECOND); break; case PROP_BANDWIDTH_USAGE: g_value_set_float (value, adaptivedemux->bitrate_limit); break; case PROP_MAX_BITRATE: g_value_set_uint (value, demux->max_bitrate); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gboolean gst_dash_demux_setup_mpdparser_streams (GstDashDemux * demux, GstMpdClient * client) { gboolean has_streams = FALSE; GList *adapt_sets, *iter; adapt_sets = gst_mpd_client_get_adaptation_sets (client); for (iter = adapt_sets; iter; iter = g_list_next (iter)) { GstAdaptationSetNode *adapt_set_node = iter->data; gst_mpd_client_setup_streaming (client, adapt_set_node); has_streams = TRUE; } if (!has_streams) { GST_ELEMENT_ERROR (demux, STREAM, DEMUX, ("Manifest has no playable " "streams"), ("No streams could be activated from the manifest")); } return has_streams; } static gboolean gst_dash_demux_setup_all_streams (GstDashDemux * demux) { guint i; GST_DEBUG_OBJECT (demux, "Setting up streams for period %d", gst_mpd_client_get_period_index (demux->client)); /* clean old active stream list, if any */ gst_active_streams_free (demux->client); if (!gst_dash_demux_setup_mpdparser_streams (demux, demux->client)) { return FALSE; } GST_DEBUG_OBJECT (demux, "Creating stream objects"); for (i = 0; i < gst_mpdparser_get_nb_active_stream (demux->client); i++) { GstDashDemuxStream *stream; GstActiveStream *active_stream; GstCaps *caps; GstPad *srcpad; gchar *lang = NULL; GstTagList *tags = NULL; active_stream = gst_mpdparser_get_active_stream_by_index (demux->client, i); if (active_stream == NULL) continue; /* TODO: support 'application' mimeType */ if (active_stream->mimeType == GST_STREAM_APPLICATION) continue; srcpad = gst_dash_demux_create_pad (demux, active_stream); caps = gst_dash_demux_get_input_caps (demux, active_stream); GST_LOG_OBJECT (demux, "Creating stream %d %" GST_PTR_FORMAT, i, caps); if (active_stream->cur_adapt_set) { GstAdaptationSetNode *adp_set = active_stream->cur_adapt_set; lang = adp_set->lang; /* Fallback to the language in ContentComponent node */ if (lang == NULL && g_list_length (adp_set->ContentComponents) == 1) { GstContentComponentNode *cc_node = adp_set->ContentComponents->data; lang = cc_node->lang; } } if (lang) { if (gst_tag_check_language_code (lang)) tags = gst_tag_list_new (GST_TAG_LANGUAGE_CODE, lang, NULL); else tags = gst_tag_list_new (GST_TAG_LANGUAGE_NAME, lang, NULL); } stream = (GstDashDemuxStream *) gst_adaptive_demux_stream_new (GST_ADAPTIVE_DEMUX_CAST (demux), srcpad); stream->active_stream = active_stream; gst_adaptive_demux_stream_set_caps (GST_ADAPTIVE_DEMUX_STREAM_CAST (stream), caps); if (tags) gst_adaptive_demux_stream_set_tags (GST_ADAPTIVE_DEMUX_STREAM_CAST (stream), tags); stream->index = i; stream->pending_seek_ts = GST_CLOCK_TIME_NONE; gst_isoff_sidx_parser_init (&stream->sidx_parser); } return TRUE; } static GstClockTime gst_dash_demux_get_duration (GstAdaptiveDemux * ademux) { GstDashDemux *demux = GST_DASH_DEMUX_CAST (ademux); g_return_val_if_fail (demux->client != NULL, GST_CLOCK_TIME_NONE); return gst_mpd_client_get_media_presentation_duration (demux->client); } static gboolean gst_dash_demux_is_live (GstAdaptiveDemux * ademux) { GstDashDemux *demux = GST_DASH_DEMUX_CAST (ademux); g_return_val_if_fail (demux->client != NULL, FALSE); return gst_mpd_client_is_live (demux->client); } static gboolean gst_dash_demux_setup_streams (GstAdaptiveDemux * demux) { GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux); gboolean ret = TRUE; GstDateTime *now = NULL; guint period_idx; /* setup video, audio and subtitle streams, starting from first Period if * non-live */ period_idx = 0; if (gst_mpd_client_is_live (dashdemux->client)) { /* get period index for period encompassing the current time */ now = gst_date_time_new_now_utc (); if (dashdemux->client->mpd_node->suggestedPresentationDelay != -1) { GstDateTime *target = gst_mpd_client_add_time_difference (now, dashdemux->client->mpd_node->suggestedPresentationDelay * -1000); gst_date_time_unref (now); now = target; } period_idx = gst_mpd_client_get_period_index_at_time (dashdemux->client, now); if (period_idx == G_MAXUINT) { #ifndef GST_DISABLE_GST_DEBUG gchar *date_str = gst_date_time_to_iso8601_string (now); GST_DEBUG_OBJECT (demux, "Unable to find live period active at %s", date_str); g_free (date_str); #endif ret = FALSE; goto done; } } if (!gst_mpd_client_set_period_index (dashdemux->client, period_idx) || !gst_dash_demux_setup_all_streams (dashdemux)) { ret = FALSE; goto done; } /* If stream is live, try to find the segment that * is closest to current time */ if (gst_mpd_client_is_live (dashdemux->client)) { GDateTime *gnow; GST_DEBUG_OBJECT (demux, "Seeking to current time of day for live stream "); gnow = gst_date_time_to_g_date_time (now); gst_mpd_client_seek_to_time (dashdemux->client, gnow); g_date_time_unref (gnow); } else { GST_DEBUG_OBJECT (demux, "Seeking to first segment for on-demand stream "); /* start playing from the first segment */ gst_mpd_client_seek_to_first_segment (dashdemux->client); } done: if (now != NULL) gst_date_time_unref (now); return ret; } static gboolean gst_dash_demux_process_manifest (GstAdaptiveDemux * demux, GstBuffer * buf) { GstAdaptiveDemuxClass *klass; GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux); gboolean ret = FALSE; gchar *manifest; GstMapInfo mapinfo; if (dashdemux->client) gst_mpd_client_free (dashdemux->client); dashdemux->client = gst_mpd_client_new (); dashdemux->client->mpd_uri = g_strdup (demux->manifest_uri); dashdemux->client->mpd_base_uri = g_strdup (demux->manifest_base_uri); GST_DEBUG_OBJECT (demux, "Fetched MPD file at URI: %s (base: %s)", dashdemux->client->mpd_uri, GST_STR_NULL (dashdemux->client->mpd_base_uri)); if (gst_buffer_map (buf, &mapinfo, GST_MAP_READ)) { manifest = (gchar *) mapinfo.data; if (gst_mpd_parse (dashdemux->client, manifest, mapinfo.size)) { if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client)) { klass = GST_ADAPTIVE_DEMUX_GET_CLASS (dashdemux); klass->data_received = gst_dash_demux_data_received; klass->finish_fragment = gst_dash_demux_stream_fragment_finished; } if (gst_mpd_client_setup_media_presentation (dashdemux->client)) { ret = TRUE; } else { GST_ELEMENT_ERROR (demux, STREAM, DECODE, ("Incompatible manifest file."), (NULL)); } } gst_buffer_unmap (buf, &mapinfo); } else { GST_WARNING_OBJECT (demux, "Failed to map manifest buffer"); } if (ret) ret = gst_dash_demux_setup_streams (demux); return ret; } static GstPad * gst_dash_demux_create_pad (GstDashDemux * demux, GstActiveStream * stream) { GstPad *pad; GstPadTemplate *tmpl; gchar *name; switch (stream->mimeType) { case GST_STREAM_AUDIO: name = g_strdup_printf ("audio_%02u", demux->n_audio_streams++); tmpl = gst_static_pad_template_get (&gst_dash_demux_audiosrc_template); break; case GST_STREAM_VIDEO: name = g_strdup_printf ("video_%02u", demux->n_video_streams++); tmpl = gst_static_pad_template_get (&gst_dash_demux_videosrc_template); break; default: g_assert_not_reached (); return NULL; } /* Create and activate new pads */ pad = gst_ghost_pad_new_no_target_from_template (name, tmpl); g_free (name); gst_object_unref (tmpl); gst_pad_set_active (pad, TRUE); GST_INFO_OBJECT (demux, "Creating srcpad %s:%s", GST_DEBUG_PAD_NAME (pad)); return pad; } static void gst_dash_demux_reset (GstAdaptiveDemux * ademux) { GstDashDemux *demux = GST_DASH_DEMUX_CAST (ademux); GST_DEBUG_OBJECT (demux, "Resetting demux"); demux->end_of_period = FALSE; demux->end_of_manifest = FALSE; if (demux->client) { gst_mpd_client_free (demux->client); demux->client = NULL; } demux->client = gst_mpd_client_new (); demux->n_audio_streams = 0; demux->n_video_streams = 0; } static GstCaps * gst_dash_demux_get_video_input_caps (GstDashDemux * demux, GstActiveStream * stream) { guint width = 0, height = 0; const gchar *mimeType = NULL; GstCaps *caps = NULL; if (stream == NULL) return NULL; /* if bitstreamSwitching is true we dont need to swich pads on resolution change */ if (!gst_mpd_client_get_bitstream_switching_flag (stream)) { width = gst_mpd_client_get_video_stream_width (stream); height = gst_mpd_client_get_video_stream_height (stream); } mimeType = gst_mpd_client_get_stream_mimeType (stream); if (mimeType == NULL) return NULL; caps = gst_caps_from_string (mimeType); if (width > 0 && height > 0) { gst_caps_set_simple (caps, "width", G_TYPE_INT, width, "height", G_TYPE_INT, height, NULL); } return caps; } static GstCaps * gst_dash_demux_get_audio_input_caps (GstDashDemux * demux, GstActiveStream * stream) { guint rate = 0, channels = 0; const gchar *mimeType; GstCaps *caps = NULL; if (stream == NULL) return NULL; /* if bitstreamSwitching is true we dont need to swich pads on rate/channels change */ if (!gst_mpd_client_get_bitstream_switching_flag (stream)) { channels = gst_mpd_client_get_audio_stream_num_channels (stream); rate = gst_mpd_client_get_audio_stream_rate (stream); } mimeType = gst_mpd_client_get_stream_mimeType (stream); if (mimeType == NULL) return NULL; caps = gst_caps_from_string (mimeType); if (rate > 0) { gst_caps_set_simple (caps, "rate", G_TYPE_INT, rate, NULL); } if (channels > 0) { gst_caps_set_simple (caps, "channels", G_TYPE_INT, channels, NULL); } return caps; } static GstCaps * gst_dash_demux_get_application_input_caps (GstDashDemux * demux, GstActiveStream * stream) { const gchar *mimeType; GstCaps *caps = NULL; if (stream == NULL) return NULL; mimeType = gst_mpd_client_get_stream_mimeType (stream); if (mimeType == NULL) return NULL; caps = gst_caps_from_string (mimeType); return caps; } static GstCaps * gst_dash_demux_get_input_caps (GstDashDemux * demux, GstActiveStream * stream) { switch (stream->mimeType) { case GST_STREAM_VIDEO: return gst_dash_demux_get_video_input_caps (demux, stream); case GST_STREAM_AUDIO: return gst_dash_demux_get_audio_input_caps (demux, stream); case GST_STREAM_APPLICATION: return gst_dash_demux_get_application_input_caps (demux, stream); default: return GST_CAPS_NONE; } } static void gst_dash_demux_stream_update_headers_info (GstAdaptiveDemuxStream * stream) { GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream; GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (stream->demux); gchar *path = NULL; gst_mpd_client_get_next_header (dashdemux->client, &path, dashstream->index, &stream->fragment.header_range_start, &stream->fragment.header_range_end); if (path != NULL && strncmp (path, "http://", 7) != 0) { stream->fragment.header_uri = gst_uri_join_strings (gst_mpdparser_get_baseURL (dashdemux->client, dashstream->index), path); g_free (path); } else { stream->fragment.header_uri = path; } path = NULL; gst_mpd_client_get_next_header_index (dashdemux->client, &path, dashstream->index, &stream->fragment.index_range_start, &stream->fragment.index_range_end); if (path != NULL && strncmp (path, "http://", 7) != 0) { stream->fragment.index_uri = gst_uri_join_strings (gst_mpdparser_get_baseURL (dashdemux->client, dashstream->index), path); g_free (path); } else { stream->fragment.index_uri = path; } } static GstFlowReturn gst_dash_demux_stream_update_fragment_info (GstAdaptiveDemuxStream * stream) { GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream; GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (stream->demux); GstClockTime ts; GstMediaFragmentInfo fragment; gboolean isombff; gst_adaptive_demux_stream_fragment_clear (&stream->fragment); isombff = gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client); if (GST_ADAPTIVE_DEMUX_STREAM_NEED_HEADER (stream) && isombff) { gst_dash_demux_stream_update_headers_info (stream); dashstream->sidx_base_offset = stream->fragment.index_range_end + 1; if (dashstream->sidx_index != 0) { /* request only the index to be downloaded as we need to reposition the * stream to a subsegment */ return GST_FLOW_OK; } } if (gst_mpd_client_get_next_fragment_timestamp (dashdemux->client, dashstream->index, &ts)) { if (GST_ADAPTIVE_DEMUX_STREAM_NEED_HEADER (stream)) { gst_dash_demux_stream_update_headers_info (stream); } gst_mpd_client_get_next_fragment (dashdemux->client, dashstream->index, &fragment); stream->fragment.uri = fragment.uri; if (isombff && dashstream->sidx_index != 0) { GstSidxBoxEntry *entry = SIDX_CURRENT_ENTRY (dashstream); stream->fragment.range_start = dashstream->sidx_base_offset + entry->offset; stream->fragment.timestamp = entry->pts; stream->fragment.duration = entry->duration; if (stream->demux->segment.rate < 0.0) { stream->fragment.range_end = stream->fragment.range_start + entry->size - 1; } else { stream->fragment.range_end = fragment.range_end; } } else { stream->fragment.timestamp = fragment.timestamp; stream->fragment.duration = fragment.duration; stream->fragment.range_start = MAX (fragment.range_start, dashstream->sidx_base_offset); stream->fragment.range_end = fragment.range_end; } return GST_FLOW_OK; } return GST_FLOW_EOS; } static void gst_dash_demux_stream_sidx_seek (GstDashDemuxStream * dashstream, GstClockTime ts) { GstSidxBox *sidx = SIDX (dashstream); gint i; /* TODO optimize to a binary search */ for (i = 0; i < sidx->entries_count; i++) { if (sidx->entries[i].pts + sidx->entries[i].duration >= ts) break; } sidx->entry_index = i; dashstream->sidx_index = i; if (i < sidx->entries_count) dashstream->sidx_current_remaining = sidx->entries[i].size; else dashstream->sidx_current_remaining = 0; } static GstFlowReturn gst_dash_demux_stream_seek (GstAdaptiveDemuxStream * stream, GstClockTime ts) { GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream; GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (stream->demux); if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client)) { if (dashstream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED) { gst_dash_demux_stream_sidx_seek (dashstream, ts); } else { /* no index yet, seek when we have it */ dashstream->pending_seek_ts = ts; } } gst_mpd_client_stream_seek (dashdemux->client, dashstream->active_stream, ts); return GST_FLOW_OK; } static gboolean gst_dash_demux_stream_advance_subfragment (GstAdaptiveDemuxStream * stream) { GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream; GstSidxBox *sidx = SIDX (dashstream); gboolean fragment_finished = TRUE; if (dashstream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED) { if (stream->demux->segment.rate > 0.0) { sidx->entry_index++; if (sidx->entry_index < sidx->entries_count) { fragment_finished = FALSE; } } else { sidx->entry_index--; if (sidx->entry_index >= 0) { fragment_finished = FALSE; } } } GST_DEBUG_OBJECT (stream->pad, "New sidx index: %d / %d. " "Finished fragment: %d", sidx->entry_index, sidx->entries_count, fragment_finished); if (!fragment_finished) { dashstream->sidx_current_remaining = sidx->entries[sidx->entry_index].size; } return !fragment_finished; } static gboolean gst_dash_demux_stream_has_next_fragment (GstAdaptiveDemuxStream * stream) { GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (stream->demux); GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream; return gst_mpd_client_has_next_segment (dashdemux->client, dashstream->active_stream, stream->demux->segment.rate > 0.0); } static GstFlowReturn gst_dash_demux_stream_advance_fragment (GstAdaptiveDemuxStream * stream) { GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream; GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (stream->demux); GST_DEBUG_OBJECT (stream->pad, "Advance fragment"); if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client)) { if (gst_dash_demux_stream_advance_subfragment (stream)) return GST_FLOW_OK; } return gst_mpd_client_advance_segment (dashdemux->client, dashstream->active_stream, stream->demux->segment.rate > 0.0); } static gboolean gst_dash_demux_stream_select_bitrate (GstAdaptiveDemuxStream * stream, guint64 bitrate) { GstActiveStream *active_stream = NULL; GList *rep_list = NULL; gint new_index; GstDashDemux *demux = GST_DASH_DEMUX_CAST (stream->demux); GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream; gboolean ret = FALSE; active_stream = dashstream->active_stream; if (active_stream == NULL) { goto end; } /* retrieve representation list */ if (active_stream->cur_adapt_set) rep_list = active_stream->cur_adapt_set->Representations; if (!rep_list) { goto end; } GST_DEBUG_OBJECT (stream->pad, "Trying to change to bitrate: %" G_GUINT64_FORMAT, bitrate); /* get representation index with current max_bandwidth */ new_index = gst_mpdparser_get_rep_idx_with_max_bandwidth (rep_list, bitrate); /* if no representation has the required bandwidth, take the lowest one */ if (new_index == -1) new_index = gst_mpdparser_get_rep_idx_with_min_bandwidth (rep_list); if (new_index != active_stream->representation_idx) { GstRepresentationNode *rep = g_list_nth_data (rep_list, new_index); GST_INFO_OBJECT (demux, "Changing representation idx: %d %d %u", dashstream->index, new_index, rep->bandwidth); if (gst_mpd_client_setup_representation (demux->client, active_stream, rep)) { GstCaps *caps; GST_INFO_OBJECT (demux, "Switching bitrate to %d", active_stream->cur_representation->bandwidth); caps = gst_dash_demux_get_input_caps (demux, active_stream); gst_adaptive_demux_stream_set_caps (stream, caps); ret = TRUE; } else { GST_WARNING_OBJECT (demux, "Can not switch representation, aborting..."); } } if (gst_mpd_client_has_isoff_ondemand_profile (demux->client)) { /* store our current position to change to the same one in a different * representation if needed */ dashstream->sidx_index = SIDX (dashstream)->entry_index; if (ret) { /* TODO cache indexes to avoid re-downloading and parsing */ /* if we switched, we need a new index */ gst_isoff_sidx_parser_clear (&dashstream->sidx_parser); gst_isoff_sidx_parser_init (&dashstream->sidx_parser); } } end: return ret; } static gboolean gst_dash_demux_seek (GstAdaptiveDemux * demux, GstEvent * seek) { gdouble rate; GstFormat format; GstSeekFlags flags; GstSeekType start_type, stop_type; gint64 start, stop; GList *list; GstClockTime current_pos, target_pos; guint current_period; GstStreamPeriod *period; GList *iter; GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux); gst_event_parse_seek (seek, &rate, &format, &flags, &start_type, &start, &stop_type, &stop); /* TODO check if start-type/stop-type is SET */ if (demux->segment.rate > 0.0) target_pos = (GstClockTime) demux->segment.start; else target_pos = (GstClockTime) demux->segment.stop; /* select the requested Period in the Media Presentation */ current_period = 0; for (list = g_list_first (dashdemux->client->periods); list; list = g_list_next (list)) { period = list->data; current_pos = period->start; current_period = period->number; GST_DEBUG_OBJECT (demux, "Looking at period %u pos %" GST_TIME_FORMAT, current_period, GST_TIME_ARGS (current_pos)); if (current_pos <= target_pos && target_pos < current_pos + period->duration) { break; } } if (list == NULL) { GST_WARNING_OBJECT (demux, "Could not find seeked Period"); return FALSE; } if (current_period != gst_mpd_client_get_period_index (dashdemux->client)) { GST_DEBUG_OBJECT (demux, "Seeking to Period %d", current_period); /* clean old active stream list, if any */ gst_active_streams_free (dashdemux->client); /* setup video, audio and subtitle streams, starting from the new Period */ if (!gst_mpd_client_set_period_index (dashdemux->client, current_period) || !gst_dash_demux_setup_all_streams (dashdemux)) return FALSE; } /* Update the current sequence on all streams */ for (iter = demux->streams; iter; iter = g_list_next (iter)) { GstDashDemuxStream *dashstream = iter->data; if (flags & GST_SEEK_FLAG_FLUSH) { gst_isoff_sidx_parser_clear (&dashstream->sidx_parser); gst_isoff_sidx_parser_init (&dashstream->sidx_parser); } gst_dash_demux_stream_seek (iter->data, target_pos); } return TRUE; } static gint64 gst_dash_demux_get_manifest_update_interval (GstAdaptiveDemux * demux) { GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux); return dashdemux->client->mpd_node->minimumUpdatePeriod * 1000; } static GstFlowReturn gst_dash_demux_update_manifest_data (GstAdaptiveDemux * demux, GstBuffer * buffer) { GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux); GstMpdClient *new_client = NULL; GstMapInfo mapinfo; GST_DEBUG_OBJECT (demux, "Updating manifest file from URL"); /* parse the manifest file */ new_client = gst_mpd_client_new (); new_client->mpd_uri = g_strdup (demux->manifest_uri); new_client->mpd_base_uri = g_strdup (demux->manifest_base_uri); gst_buffer_map (buffer, &mapinfo, GST_MAP_READ); if (gst_mpd_parse (new_client, (gchar *) mapinfo.data, mapinfo.size)) { const gchar *period_id; guint period_idx; GList *iter; GList *streams_iter; /* prepare the new manifest and try to transfer the stream position * status from the old manifest client */ GST_DEBUG_OBJECT (demux, "Updating manifest"); period_id = gst_mpd_client_get_period_id (dashdemux->client); period_idx = gst_mpd_client_get_period_index (dashdemux->client); /* setup video, audio and subtitle streams, starting from current Period */ if (!gst_mpd_client_setup_media_presentation (new_client)) { /* TODO */ } if (period_id) { if (!gst_mpd_client_set_period_id (new_client, period_id)) { GST_DEBUG_OBJECT (demux, "Error setting up the updated manifest file"); return GST_FLOW_EOS; } } else { if (!gst_mpd_client_set_period_index (new_client, period_idx)) { GST_DEBUG_OBJECT (demux, "Error setting up the updated manifest file"); return GST_FLOW_EOS; } } if (!gst_dash_demux_setup_mpdparser_streams (dashdemux, new_client)) { GST_ERROR_OBJECT (demux, "Failed to setup streams on manifest " "update"); return GST_FLOW_ERROR; } /* update the streams to play from the next segment */ for (iter = demux->streams, streams_iter = new_client->active_streams; iter && streams_iter; iter = g_list_next (iter), streams_iter = g_list_next (streams_iter)) { GstDashDemuxStream *demux_stream = iter->data; GstActiveStream *new_stream = streams_iter->data; GstClockTime ts; if (!new_stream) { GST_DEBUG_OBJECT (demux, "Stream of index %d is missing from manifest update", demux_stream->index); return GST_FLOW_EOS; } if (gst_mpd_client_get_next_fragment_timestamp (dashdemux->client, demux_stream->index, &ts) || gst_mpd_client_get_last_fragment_timestamp_end (dashdemux->client, demux_stream->index, &ts)) { /* Due to rounding when doing the timescale conversions it might happen * that the ts falls back to a previous segment, leading the same data * to be downloaded twice. We try to work around this by always adding * 10 microseconds to get back to the correct segment. The errors are * usually on the order of nanoseconds so it should be enough. */ GST_DEBUG_OBJECT (GST_ADAPTIVE_DEMUX_STREAM_PAD (demux_stream), "Current position: %" GST_TIME_FORMAT ", updating to %" GST_TIME_FORMAT, GST_TIME_ARGS (ts), GST_TIME_ARGS (ts + (10 * GST_USECOND))); ts += 10 * GST_USECOND; gst_mpd_client_stream_seek (new_client, new_stream, ts); } demux_stream->active_stream = new_stream; } gst_mpd_client_free (dashdemux->client); dashdemux->client = new_client; GST_DEBUG_OBJECT (demux, "Manifest file successfully updated"); } else { /* In most cases, this will happen if we set a wrong url in the * source element and we have received the 404 HTML response instead of * the manifest */ GST_WARNING_OBJECT (demux, "Error parsing the manifest."); gst_buffer_unmap (buffer, &mapinfo); return GST_FLOW_ERROR; } gst_buffer_unmap (buffer, &mapinfo); return GST_FLOW_OK; } static gint64 gst_dash_demux_stream_get_fragment_waiting_time (GstAdaptiveDemuxStream * stream) { GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (stream->demux); GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream; GstDateTime *seg_end_time; GstActiveStream *active_stream = dashstream->active_stream; seg_end_time = gst_mpd_client_get_next_segment_availability_end_time (dashdemux->client, active_stream); if (seg_end_time) { gint64 diff; GstDateTime *cur_time; cur_time = gst_date_time_new_now_utc (); diff = gst_mpd_client_calculate_time_difference (cur_time, seg_end_time); gst_date_time_unref (seg_end_time); gst_date_time_unref (cur_time); return diff; } return 0; } static gboolean gst_dash_demux_has_next_period (GstAdaptiveDemux * demux) { GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux); if (demux->segment.rate >= 0) return gst_mpd_client_has_next_period (dashdemux->client); else return gst_mpd_client_has_previous_period (dashdemux->client); } static void gst_dash_demux_advance_period (GstAdaptiveDemux * demux) { GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux); g_return_if_fail (gst_mpd_client_has_next_period (dashdemux->client)); if (demux->segment.rate >= 0) { if (!gst_mpd_client_set_period_index (dashdemux->client, gst_mpd_client_get_period_index (dashdemux->client) + 1)) { /* TODO error */ return; } } else { if (!gst_mpd_client_set_period_index (dashdemux->client, gst_mpd_client_get_period_index (dashdemux->client) - 1)) { /* TODO error */ return; } } gst_dash_demux_setup_all_streams (dashdemux); gst_mpd_client_seek_to_first_segment (dashdemux->client); } static GstBuffer * _gst_buffer_split (GstBuffer * buffer, gint offset, gsize size) { GstBuffer *newbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_META | GST_BUFFER_COPY_MEMORY, offset, size - offset); gst_buffer_resize (buffer, 0, offset); return newbuf; } static GstFlowReturn gst_dash_demux_stream_fragment_finished (GstAdaptiveDemux * demux, GstAdaptiveDemuxStream * stream) { GstDashDemux *dashdemux = GST_DASH_DEMUX_CAST (demux); GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream; if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client) && dashstream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED) { /* fragment is advanced on data_received when byte limits are reached */ return GST_FLOW_OK; } else { if (G_UNLIKELY (stream->downloading_header || stream->downloading_index)) return GST_FLOW_OK; return gst_adaptive_demux_stream_advance_fragment (demux, stream, stream->fragment.duration); } } static GstFlowReturn gst_dash_demux_data_received (GstAdaptiveDemux * demux, GstAdaptiveDemuxStream * stream) { GstDashDemuxStream *dash_stream = (GstDashDemuxStream *) stream; GstFlowReturn ret = GST_FLOW_OK; GstBuffer *buffer; gsize available; if (stream->downloading_index) { GstIsoffParserResult res; guint consumed; available = gst_adapter_available (stream->adapter); buffer = gst_adapter_take_buffer (stream->adapter, available); if (dash_stream->sidx_parser.status != GST_ISOFF_SIDX_PARSER_FINISHED) { res = gst_isoff_sidx_parser_add_buffer (&dash_stream->sidx_parser, buffer, &consumed); if (res == GST_ISOFF_PARSER_ERROR) { } else if (res == GST_ISOFF_PARSER_UNEXPECTED) { /* this is not a 'sidx' index, just skip it and continue playback */ } else { /* when finished, prepare for real data streaming */ if (dash_stream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED) { if (GST_CLOCK_TIME_IS_VALID (dash_stream->pending_seek_ts)) { gst_dash_demux_stream_sidx_seek (dash_stream, dash_stream->pending_seek_ts); dash_stream->pending_seek_ts = GST_CLOCK_TIME_NONE; } else { SIDX (dash_stream)->entry_index = dash_stream->sidx_index; } dash_stream->sidx_current_remaining = SIDX_CURRENT_ENTRY (dash_stream)->size; } else if (consumed < available) { GstBuffer *pending; /* we still need to keep some data around for the next parsing round * so just push what was already processed by the parser */ pending = _gst_buffer_split (buffer, consumed, -1); gst_adapter_push (stream->adapter, pending); } } } ret = gst_adaptive_demux_stream_push_buffer (stream, buffer); } else if (dash_stream->sidx_parser.status == GST_ISOFF_SIDX_PARSER_FINISHED) { while (ret == GST_FLOW_OK && ((available = gst_adapter_available (stream->adapter)) > 0)) { gboolean advance = FALSE; if (available < dash_stream->sidx_current_remaining) { buffer = gst_adapter_take_buffer (stream->adapter, available); dash_stream->sidx_current_remaining -= available; } else { buffer = gst_adapter_take_buffer (stream->adapter, dash_stream->sidx_current_remaining); dash_stream->sidx_current_remaining = 0; advance = TRUE; } ret = gst_adaptive_demux_stream_push_buffer (stream, buffer); if (advance) { GstFlowReturn new_ret; new_ret = gst_adaptive_demux_stream_advance_fragment (demux, stream, SIDX_CURRENT_ENTRY (dash_stream)->duration); /* only overwrite if it was OK before */ if (ret == GST_FLOW_OK) ret = new_ret; } } } else { /* this should be the main header, just push it all */ ret = gst_adaptive_demux_stream_push_buffer (stream, gst_adapter_take_buffer (stream->adapter, gst_adapter_available (stream->adapter))); } return ret; } static void gst_dash_demux_stream_free (GstAdaptiveDemuxStream * stream) { GstDashDemuxStream *dash_stream = (GstDashDemuxStream *) stream; gst_isoff_sidx_parser_clear (&dash_stream->sidx_parser); }