/* GStreamer * Copyright (C) 2010 Marc-Andre Lureau * Copyright (C) 2010 Andoni Morales Alastruey * * Gsthlsdemux.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-hlsdemux * * HTTP Live Streaming demuxer element. * * * Example launch line * |[ * gst-launch souphttpsrc location=http://devimages.apple.com/iphone/samples/bipbop/gear4/prog_index.m3u8 ! hlsdemux ! decodebin2 ! ffmpegcolorspace ! videoscale ! autovideosink * ]| * * * Last reviewed on 2010-10-07 */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include "gsthlsdemux.h" static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-hls")); static GstStaticPadTemplate fetchertemplate = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); GST_DEBUG_CATEGORY_STATIC (gst_hls_demux_debug); #define GST_CAT_DEFAULT gst_hls_demux_debug enum { PROP_0, PROP_FRAGMENTS_CACHE, PROP_BITRATE_SWITCH_TOLERANCE, PROP_LAST }; static const float update_interval_factor[] = { 1, 0.5, 1.5, 3 }; #define DEFAULT_FRAGMENTS_CACHE 3 #define DEFAULT_FAILED_COUNT 3 #define DEFAULT_BITRATE_SWITCH_TOLERANCE 0.4 /* GObject */ static void gst_hls_demux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_hls_demux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_hls_demux_dispose (GObject * obj); /* GstElement */ static GstStateChangeReturn gst_hls_demux_change_state (GstElement * element, GstStateChange transition); /* GstHLSDemux */ static GstBusSyncReply gst_hls_demux_fetcher_bus_handler (GstBus * bus, GstMessage * message, gpointer data); static GstFlowReturn gst_hls_demux_chain (GstPad * pad, GstBuffer * buf); static gboolean gst_hls_demux_sink_event (GstPad * pad, GstEvent * event); static gboolean gst_hls_demux_src_event (GstPad * pad, GstEvent * event); static gboolean gst_hls_demux_src_query (GstPad * pad, GstQuery * query); static GstFlowReturn gst_hls_demux_fetcher_chain (GstPad * pad, GstBuffer * buf); static gboolean gst_hls_demux_fetcher_sink_event (GstPad * pad, GstEvent * event); static void gst_hls_demux_loop (GstHLSDemux * demux); static void gst_hls_demux_stop (GstHLSDemux * demux); static void gst_hls_demux_stop_fetcher (GstHLSDemux * demux, gboolean cancelled); static gboolean gst_hls_demux_start_update (GstHLSDemux * demux); static gboolean gst_hls_demux_cache_fragments (GstHLSDemux * demux); static gboolean gst_hls_demux_schedule (GstHLSDemux * demux); static gboolean gst_hls_demux_switch_playlist (GstHLSDemux * demux); static gboolean gst_hls_demux_get_next_fragment (GstHLSDemux * demux, gboolean retry); static gboolean gst_hls_demux_update_playlist (GstHLSDemux * demux, gboolean retry); static void gst_hls_demux_reset (GstHLSDemux * demux, gboolean dispose); static gboolean gst_hls_demux_set_location (GstHLSDemux * demux, const gchar * uri); static gchar *gst_hls_src_buf_to_utf8_playlist (gchar * string, guint size); static void _do_init (GType type) { GST_DEBUG_CATEGORY_INIT (gst_hls_demux_debug, "hlsdemux", 0, "hlsdemux element"); } GST_BOILERPLATE_FULL (GstHLSDemux, gst_hls_demux, GstElement, GST_TYPE_ELEMENT, _do_init); static void gst_hls_demux_base_init (gpointer g_class) { GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&srctemplate)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&sinktemplate)); gst_element_class_set_details_simple (element_class, "HLS Demuxer", "Demuxer/URIList", "HTTP Live Streaming demuxer", "Marc-Andre Lureau \n" "Andoni Morales Alastruey "); } static void gst_hls_demux_dispose (GObject * obj) { GstHLSDemux *demux = GST_HLS_DEMUX (obj); g_cond_free (demux->fetcher_cond); g_mutex_free (demux->fetcher_lock); g_cond_free (demux->thread_cond); g_mutex_free (demux->thread_lock); if (GST_TASK_STATE (demux->task) != GST_TASK_STOPPED) { gst_task_stop (demux->task); gst_task_join (demux->task); } gst_object_unref (demux->task); g_static_rec_mutex_free (&demux->task_lock); gst_object_unref (demux->fetcher_bus); gst_object_unref (demux->fetcherpad); gst_hls_demux_reset (demux, TRUE); gst_object_unref (demux->download); G_OBJECT_CLASS (parent_class)->dispose (obj); } static void gst_hls_demux_class_init (GstHLSDemuxClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gobject_class->set_property = gst_hls_demux_set_property; gobject_class->get_property = gst_hls_demux_get_property; gobject_class->dispose = gst_hls_demux_dispose; g_object_class_install_property (gobject_class, PROP_FRAGMENTS_CACHE, g_param_spec_uint ("fragments-cache", "Fragments cache", "Number of fragments needed to be cached to start playing", 2, G_MAXUINT, DEFAULT_FRAGMENTS_CACHE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_BITRATE_SWITCH_TOLERANCE, g_param_spec_float ("bitrate-switch-tolerance", "Bitrate switch tolerance", "Tolerance with respect of the fragment duration to switch to " "a different bitrate if the client is too slow/fast.", 0, 1, DEFAULT_BITRATE_SWITCH_TOLERANCE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_hls_demux_change_state); } static void gst_hls_demux_init (GstHLSDemux * demux, GstHLSDemuxClass * klass) { /* sink pad */ demux->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink"); gst_pad_set_chain_function (demux->sinkpad, GST_DEBUG_FUNCPTR (gst_hls_demux_chain)); gst_pad_set_event_function (demux->sinkpad, GST_DEBUG_FUNCPTR (gst_hls_demux_sink_event)); gst_element_add_pad (GST_ELEMENT (demux), demux->sinkpad); /* demux pad */ demux->srcpad = gst_pad_new_from_static_template (&srctemplate, "src"); gst_pad_set_event_function (demux->srcpad, GST_DEBUG_FUNCPTR (gst_hls_demux_src_event)); gst_pad_set_query_function (demux->srcpad, GST_DEBUG_FUNCPTR (gst_hls_demux_src_query)); gst_pad_set_element_private (demux->srcpad, demux); gst_element_add_pad (GST_ELEMENT (demux), demux->srcpad); /* fetcher pad */ demux->fetcherpad = gst_pad_new_from_static_template (&fetchertemplate, "sink"); gst_pad_set_chain_function (demux->fetcherpad, GST_DEBUG_FUNCPTR (gst_hls_demux_fetcher_chain)); gst_pad_set_event_function (demux->fetcherpad, GST_DEBUG_FUNCPTR (gst_hls_demux_fetcher_sink_event)); gst_pad_set_element_private (demux->fetcherpad, demux); gst_pad_activate_push (demux->fetcherpad, TRUE); /* Properties */ demux->fragments_cache = DEFAULT_FRAGMENTS_CACHE; demux->bitrate_switch_tol = DEFAULT_BITRATE_SWITCH_TOLERANCE; demux->download = gst_adapter_new (); demux->fetcher_bus = gst_bus_new (); gst_bus_set_sync_handler (demux->fetcher_bus, gst_hls_demux_fetcher_bus_handler, demux); demux->thread_cond = g_cond_new (); demux->thread_lock = g_mutex_new (); demux->fetcher_cond = g_cond_new (); demux->fetcher_lock = g_mutex_new (); demux->queue = g_queue_new (); g_static_rec_mutex_init (&demux->task_lock); demux->task = gst_task_create ((GstTaskFunction) gst_hls_demux_loop, demux); gst_task_set_lock (demux->task, &demux->task_lock); } static void gst_hls_demux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstHLSDemux *demux = GST_HLS_DEMUX (object); switch (prop_id) { case PROP_FRAGMENTS_CACHE: demux->fragments_cache = g_value_get_uint (value); break; case PROP_BITRATE_SWITCH_TOLERANCE: demux->bitrate_switch_tol = g_value_get_float (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_hls_demux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstHLSDemux *demux = GST_HLS_DEMUX (object); switch (prop_id) { case PROP_FRAGMENTS_CACHE: g_value_set_uint (value, demux->fragments_cache); break; case PROP_BITRATE_SWITCH_TOLERANCE: g_value_set_float (value, demux->bitrate_switch_tol); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstStateChangeReturn gst_hls_demux_change_state (GstElement * element, GstStateChange transition) { GstStateChangeReturn ret; GstHLSDemux *demux = GST_HLS_DEMUX (element); switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: gst_hls_demux_reset (demux, FALSE); break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: demux->cancelled = TRUE; g_cond_signal (demux->fetcher_cond); break; default: break; } return ret; } static gboolean gst_hls_demux_src_event (GstPad * pad, GstEvent * event) { switch (event->type) { /* FIXME: ignore seek event for the moment */ case GST_EVENT_SEEK: gst_event_unref (event); return FALSE; default: break; } return gst_pad_event_default (pad, event); } static gboolean gst_hls_demux_sink_event (GstPad * pad, GstEvent * event) { GstHLSDemux *demux = GST_HLS_DEMUX (gst_pad_get_parent (pad)); GstQuery *query; gboolean ret; gchar *uri; switch (event->type) { case GST_EVENT_EOS:{ gchar *playlist; if (demux->playlist == NULL) { GST_WARNING_OBJECT (demux, "Received EOS without a playlist."); break; } GST_DEBUG_OBJECT (demux, "Got EOS on the sink pad: main playlist fetched"); query = gst_query_new_uri (); ret = gst_pad_peer_query (demux->sinkpad, query); if (ret) { gst_query_parse_uri (query, &uri); gst_hls_demux_set_location (demux, uri); g_free (uri); } gst_query_unref (query); playlist = gst_hls_src_buf_to_utf8_playlist ((gchar *) GST_BUFFER_DATA (demux->playlist), GST_BUFFER_SIZE (demux->playlist)); gst_buffer_unref (demux->playlist); if (playlist == NULL) { GST_WARNING_OBJECT (demux, "Error validating first playlist."); } else if (!gst_m3u8_client_update (demux->client, playlist)) { /* 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 playlist */ GST_ELEMENT_ERROR (demux, STREAM, DECODE, ("Invalid playlist."), NULL); return FALSE; } if (!ret && gst_m3u8_client_is_live (demux->client)) { GST_ELEMENT_ERROR (demux, RESOURCE, NOT_FOUND, ("Failed querying the playlist uri, " "required for live sources."), NULL); return FALSE; } gst_task_start (demux->task); gst_event_unref (event); return TRUE; } default: break; } return gst_pad_event_default (pad, event); } static gboolean gst_hls_demux_src_query (GstPad * pad, GstQuery * query) { GstHLSDemux *hlsdemux; gboolean ret = FALSE; if (query == NULL) return FALSE; hlsdemux = GST_HLS_DEMUX (gst_pad_get_element_private (pad)); switch (query->type) { case GST_QUERY_DURATION:{ GstClockTime duration; duration = gst_m3u8_client_get_duration (hlsdemux->client); if (duration) { gst_query_set_duration (query, GST_FORMAT_TIME, duration); ret = TRUE; } break; } case GST_QUERY_URI: if (hlsdemux->client) { /* FIXME: Do we answer with the variant playlist, with the current * playlist or the the uri of the least downlowaded fragment? */ gst_query_set_uri (query, hlsdemux->client->current->uri); ret = TRUE; } break; default: /* Don't fordward queries upstream because of the special nature of this * "demuxer", which relies on the upstream element only to be feed with the * first playlist */ break; } return ret; } static gboolean gst_hls_demux_fetcher_sink_event (GstPad * pad, GstEvent * event) { GstHLSDemux *demux = GST_HLS_DEMUX (gst_pad_get_element_private (pad)); switch (event->type) { case GST_EVENT_EOS:{ GST_DEBUG_OBJECT (demux, "Got EOS on the fetcher pad"); /* signal we have fetched the URI */ if (!demux->cancelled) g_cond_signal (demux->fetcher_cond); } default: break; } gst_event_unref (event); return FALSE; } static GstFlowReturn gst_hls_demux_chain (GstPad * pad, GstBuffer * buf) { GstHLSDemux *demux = GST_HLS_DEMUX (gst_pad_get_parent (pad)); if (demux->playlist == NULL) demux->playlist = buf; else demux->playlist = gst_buffer_join (demux->playlist, buf); gst_object_unref (demux); return GST_FLOW_OK; } static GstFlowReturn gst_hls_demux_fetcher_chain (GstPad * pad, GstBuffer * buf) { GstHLSDemux *demux = GST_HLS_DEMUX (gst_pad_get_element_private (pad)); /* The source element can be an http source element. In case we get a 404, * the html response will be sent downstream and the adapter * will not be null, which might make us think that the request proceed * successfully. But it will also post an error message in the bus that * is handled synchronously and that will set demux->fetcher_error to TRUE, * which is used to discard this buffer with the html response. */ if (demux->fetcher_error) { goto done; } GST_LOG_OBJECT (demux, "The uri fetcher received a new buffer of size %u", GST_BUFFER_SIZE (buf)); gst_adapter_push (demux->download, buf); done: { return GST_FLOW_OK; } } static void gst_hls_demux_stop_fetcher (GstHLSDemux * demux, gboolean cancelled) { GstPad *pad; /* When the fetcher is stopped while it's downloading, we will get an EOS that * unblocks the fetcher thread and tries to stop it again from that thread. * Here we check if the fetcher as already been stopped before continuing */ if (demux->fetcher == NULL || demux->stopping_fetcher) return; GST_DEBUG_OBJECT (demux, "Stopping fetcher."); demux->stopping_fetcher = TRUE; /* set the element state to NULL */ gst_element_set_state (demux->fetcher, GST_STATE_NULL); gst_element_get_state (demux->fetcher, NULL, NULL, GST_CLOCK_TIME_NONE); /* unlink it from the internal pad */ pad = gst_pad_get_peer (demux->fetcherpad); if (pad) { gst_pad_unlink (pad, demux->fetcherpad); gst_object_unref (pad); } /* and finally unref it */ gst_object_unref (demux->fetcher); demux->fetcher = NULL; /* if we stopped it to cancell a download, free the cached buffer */ if (cancelled && !gst_adapter_available (demux->download)) { gst_adapter_clear (demux->download); /* signal the fetcher thread that the download has finished/cancelled */ g_cond_signal (demux->fetcher_cond); } } static void gst_hls_demux_stop (GstHLSDemux * demux) { gst_hls_demux_stop_fetcher (demux, TRUE); if (GST_TASK_STATE (demux->task) != GST_TASK_STOPPED) gst_task_stop (demux->task); g_cond_signal (demux->thread_cond); } static void gst_hls_demux_loop (GstHLSDemux * demux) { GstBuffer *buf; GstFlowReturn ret; /* Loop for the source pad task. The task is started when we have * received the main playlist from the source element. It tries first to * cache the first fragments and then it waits until it has more data in the * queue. This task is woken up when we push a new fragment to the queue or * when we reached the end of the playlist */ if (G_UNLIKELY (demux->need_cache)) { if (!gst_hls_demux_cache_fragments (demux)) goto cache_error; /* we can start now the updates thread */ gst_hls_demux_start_update (demux); GST_INFO_OBJECT (demux, "First fragments cached successfully"); } if (g_queue_is_empty (demux->queue)) { if (demux->end_of_playlist) goto end_of_playlist; GST_TASK_WAIT (demux->task); /* If the queue is still empty check again if it's the end of the * playlist in case we reached it after beeing woken up */ if (g_queue_is_empty (demux->queue) && demux->end_of_playlist) goto end_of_playlist; } buf = g_queue_pop_head (demux->queue); ret = gst_pad_push (demux->srcpad, buf); if (ret != GST_FLOW_OK) goto error; return; end_of_playlist: { GST_DEBUG_OBJECT (demux, "Reached end of playlist, sending EOS"); gst_pad_push_event (demux->srcpad, gst_event_new_eos ()); gst_hls_demux_stop (demux); return; } cache_error: { GST_ELEMENT_ERROR (demux, RESOURCE, NOT_FOUND, ("Could not cache the first fragments"), NULL); gst_hls_demux_stop (demux); return; } error: { /* FIXME: handle error */ gst_hls_demux_stop (demux); return; } } static GstBusSyncReply gst_hls_demux_fetcher_bus_handler (GstBus * bus, GstMessage * message, gpointer data) { GstHLSDemux *demux = GST_HLS_DEMUX (data); if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ERROR) { demux->fetcher_error = TRUE; g_cond_signal (demux->fetcher_cond); } gst_message_unref (message); return GST_BUS_DROP; } static gboolean gst_hls_demux_make_fetcher (GstHLSDemux * demux, const gchar * uri) { GstPad *pad; if (!gst_uri_is_valid (uri)) return FALSE; GST_DEBUG_OBJECT (demux, "Creating fetcher for the URI:%s", uri); demux->fetcher = gst_element_make_from_uri (GST_URI_SRC, uri, NULL); if (!demux->fetcher) return FALSE; demux->fetcher_error = FALSE; demux->stopping_fetcher = FALSE; gst_element_set_bus (GST_ELEMENT (demux->fetcher), demux->fetcher_bus); g_object_set (G_OBJECT (demux->fetcher), "location", uri, NULL); pad = gst_element_get_static_pad (demux->fetcher, "src"); if (pad) { gst_pad_link (pad, demux->fetcherpad); gst_object_unref (pad); } return TRUE; } static void gst_hls_demux_reset (GstHLSDemux * demux, gboolean dispose) { demux->need_cache = TRUE; demux->thread_return = FALSE; demux->accumulated_delay = 0; demux->end_of_playlist = FALSE; demux->cancelled = FALSE; if (demux->input_caps) { gst_caps_unref (demux->input_caps); demux->input_caps = NULL; } if (demux->playlist) { gst_buffer_unref (demux->playlist); demux->playlist = NULL; } gst_adapter_clear (demux->download); if (demux->client) gst_m3u8_client_free (demux->client); if (!dispose) { demux->client = gst_m3u8_client_new (""); } while (!g_queue_is_empty (demux->queue)) { GstBuffer *buf = g_queue_pop_head (demux->queue); gst_buffer_unref (buf); } g_queue_clear (demux->queue); } static gboolean gst_hls_demux_set_location (GstHLSDemux * demux, const gchar * uri) { if (demux->client) gst_m3u8_client_free (demux->client); demux->client = gst_m3u8_client_new (uri); GST_INFO_OBJECT (demux, "Changed location: %s", uri); return TRUE; } static gboolean gst_hls_demux_update_thread (GstHLSDemux * demux) { /* Loop for the updates. It's started when the first fragments are cached and * schedules the next update of the playlist (for lives sources) and the next * update of fragments. When a new fragment is downloaded, it compares the * download time with the next scheduled update to check if we can or should * switch to a different bitrate */ g_mutex_lock (demux->thread_lock); while (TRUE) { /* block until the next scheduled update or the signal to quit this thread */ if (g_cond_timed_wait (demux->thread_cond, demux->thread_lock, &demux->next_update)) { goto quit; } /* update the playlist for live sources */ if (gst_m3u8_client_is_live (demux->client)) { if (!gst_hls_demux_update_playlist (demux, TRUE)) { GST_ERROR_OBJECT (demux, "Could not update the playlist"); goto quit; } } /* schedule the next update */ gst_hls_demux_schedule (demux); /* if it's a live source and the playlist couldn't be updated, there aren't * more fragments in the playlist, so we just wait for the next schedulled * update */ if (gst_m3u8_client_is_live (demux->client) && demux->client->update_failed_count > 0) { GST_WARNING_OBJECT (demux, "The playlist hasn't been updated, failed count is %d", demux->client->update_failed_count); continue; } /* fetch the next fragment */ if (!gst_hls_demux_get_next_fragment (demux, TRUE)) { if (!demux->end_of_playlist && !demux->cancelled) GST_ERROR_OBJECT (demux, "Could not fetch the next fragment"); goto quit; } /* try to switch to another bitrate if needed */ gst_hls_demux_switch_playlist (demux); } quit: { g_mutex_unlock (demux->thread_lock); return TRUE; } } static gboolean gst_hls_demux_start_update (GstHLSDemux * demux) { GError *error; /* creates a new thread for the updates */ demux->updates_thread = g_thread_create ( (GThreadFunc) gst_hls_demux_update_thread, demux, TRUE, &error); return (error != NULL); } static gboolean gst_hls_demux_cache_fragments (GstHLSDemux * demux) { gint i; /* Start parsing the main playlist */ gst_m3u8_client_set_current (demux->client, demux->client->main); if (gst_m3u8_client_is_live (demux->client)) { if (!gst_hls_demux_update_playlist (demux, FALSE)) { GST_ERROR_OBJECT (demux, "Could not fetch the main playlist %s", demux->client->main->uri); return FALSE; } } /* If this playlist is a variant playlist, select the first one * and update it */ if (gst_m3u8_client_has_variant_playlist (demux->client)) { GstM3U8 *child = demux->client->main->lists->data; gst_m3u8_client_set_current (demux->client, child); if (!gst_hls_demux_update_playlist (demux, FALSE)) { GST_ERROR_OBJECT (demux, "Could not fetch the child playlist %s", child->uri); return FALSE; } } /* If it's a live source, set the sequence number to the end of the list * and substract the 'fragmets_cache' to start from the last fragment*/ if (gst_m3u8_client_is_live (demux->client)) { demux->client->sequence += g_list_length (demux->client->current->files); if (demux->client->sequence >= demux->fragments_cache) demux->client->sequence -= demux->fragments_cache; else demux->client->sequence = 0; } /* Cache the first fragments */ for (i = 0; i < demux->fragments_cache - 1; i++) { if (!gst_hls_demux_get_next_fragment (demux, FALSE)) { if (!demux->cancelled) GST_ERROR_OBJECT (demux, "Error caching the first fragments"); return FALSE; } /* make sure we stop caching fragments if something cancelled it */ if (demux->cancelled) return FALSE; } g_get_current_time (&demux->next_update); demux->need_cache = FALSE; return TRUE; } static gboolean gst_hls_demux_fetch_location (GstHLSDemux * demux, const gchar * uri) { GstStateChangeReturn ret; gboolean bret = FALSE; g_mutex_lock (demux->fetcher_lock); if (!gst_hls_demux_make_fetcher (demux, uri)) { goto uri_error; } ret = gst_element_set_state (demux->fetcher, GST_STATE_PLAYING); if (ret == GST_STATE_CHANGE_FAILURE) goto state_change_error; /* wait until we have fetched the uri */ GST_DEBUG_OBJECT (demux, "Waiting to fetch the URI"); g_cond_wait (demux->fetcher_cond, demux->fetcher_lock); gst_hls_demux_stop_fetcher (demux, FALSE); if (gst_adapter_available (demux->download)) { GST_INFO_OBJECT (demux, "URI fetched successfully"); bret = TRUE; } goto quit; uri_error: { GST_ELEMENT_ERROR (demux, RESOURCE, OPEN_READ, ("Could not create an element to fetch the given URI."), ("URI: \"%s\"", uri)); bret = FALSE; goto quit; } state_change_error: { GST_ELEMENT_ERROR (demux, CORE, STATE_CHANGE, ("Error changing state of the fetcher element."), NULL); bret = FALSE; goto quit; } quit: { g_mutex_unlock (demux->fetcher_lock); return bret; } } static gchar * gst_hls_src_buf_to_utf8_playlist (gchar * data, guint size) { gchar *playlist; if (!g_utf8_validate (data, size, NULL)) return NULL; /* alloc size + 1 to end with a null character */ playlist = g_malloc0 (size + 1); memcpy (playlist, data, size + 1); return playlist; } static gboolean gst_hls_demux_update_playlist (GstHLSDemux * demux, gboolean retry) { const guint8 *data; gchar *playlist; guint avail; GST_INFO_OBJECT (demux, "Updating the playlist %s", demux->client->current->uri); if (!gst_hls_demux_fetch_location (demux, demux->client->current->uri)) return FALSE; avail = gst_adapter_available (demux->download); data = gst_adapter_peek (demux->download, avail); playlist = gst_hls_src_buf_to_utf8_playlist ((gchar *) data, avail); gst_adapter_clear (demux->download); if (playlist == NULL) { GST_WARNING_OBJECT (demux, "Couldn't not validate playlist encoding"); return FALSE; } gst_m3u8_client_update (demux->client, playlist); return TRUE; } static gboolean gst_hls_demux_change_playlist (GstHLSDemux * demux, gboolean is_fast) { GList *list; GstStructure *s; if (is_fast) list = g_list_next (demux->client->main->lists); else list = g_list_previous (demux->client->main->lists); /* Don't do anything else if the playlist is the same */ if (!list || list->data == demux->client->current) return TRUE; demux->client->main->lists = list; gst_m3u8_client_set_current (demux->client, demux->client->main->lists->data); gst_hls_demux_update_playlist (demux, TRUE); GST_INFO_OBJECT (demux, "Client is %s, switching to bitrate %d", is_fast ? "fast" : "slow", demux->client->current->bandwidth); s = gst_structure_new ("playlist", "uri", G_TYPE_STRING, demux->client->current->uri, "bitrate", G_TYPE_INT, demux->client->current->bandwidth, NULL); gst_element_post_message (GST_ELEMENT_CAST (demux), gst_message_new_element (GST_OBJECT_CAST (demux), s)); return TRUE; } static gboolean gst_hls_demux_schedule (GstHLSDemux * demux) { gfloat update_factor; gint count; /* As defined in ยง6.3.4. Reloading the Playlist file: * "If the client reloads a Playlist file and finds that it has not * changed then it MUST wait for a period of time before retrying. The * minimum delay is a multiple of the target duration. This multiple is * 0.5 for the first attempt, 1.5 for the second, and 3.0 thereafter." */ count = demux->client->update_failed_count; if (count < 3) update_factor = update_interval_factor[count]; else update_factor = update_interval_factor[3]; /* schedule the next update using the target duration field of the * playlist */ g_time_val_add (&demux->next_update, demux->client->current->targetduration * update_factor * 1000000); GST_DEBUG_OBJECT (demux, "Next update scheduled at %s", g_time_val_to_iso8601 (&demux->next_update)); return TRUE; } static gboolean gst_hls_demux_switch_playlist (GstHLSDemux * demux) { GTimeVal now; gint64 diff, limit; g_get_current_time (&now); if (!demux->client->main->lists) return TRUE; /* compare the time when the fragment was downloaded with the time when it was * scheduled */ diff = (GST_TIMEVAL_TO_TIME (demux->next_update) - GST_TIMEVAL_TO_TIME (now)); limit = demux->client->current->targetduration * GST_SECOND * demux->bitrate_switch_tol; /* if we are on time switch to a higher bitrate */ if (diff > limit) { gst_hls_demux_change_playlist (demux, TRUE); } else if (diff < 0) { /* if the client is too slow wait until it has accumulated a certain delay to * switch to a lower bitrate */ demux->accumulated_delay -= diff; if (demux->accumulated_delay >= limit) { gst_hls_demux_change_playlist (demux, FALSE); } else if (demux->accumulated_delay < 0) { demux->accumulated_delay = 0; } } return TRUE; } static gboolean gst_hls_demux_get_next_fragment (GstHLSDemux * demux, gboolean retry) { GstBuffer *buf; guint avail; const gchar *next_fragment_uri; gboolean discont; next_fragment_uri = gst_m3u8_client_get_next_fragment (demux->client, &discont); if (!next_fragment_uri) { GST_INFO_OBJECT (demux, "This playlist doesn't contain more fragments"); demux->end_of_playlist = TRUE; GST_TASK_SIGNAL (demux->task); return FALSE; } GST_INFO_OBJECT (demux, "Fetching next fragment %s", next_fragment_uri); if (!gst_hls_demux_fetch_location (demux, next_fragment_uri)) return FALSE; avail = gst_adapter_available (demux->download); buf = gst_adapter_take_buffer (demux->download, avail); if (G_UNLIKELY (demux->input_caps == NULL)) { demux->input_caps = gst_type_find_helper_for_buffer (NULL, buf, NULL); if (demux->input_caps) { gst_pad_set_caps (demux->srcpad, demux->input_caps); GST_INFO_OBJECT (demux, "Input source caps: %" GST_PTR_FORMAT, demux->input_caps); } } if (discont) { GST_DEBUG_OBJECT (demux, "Marking fragment as discontinuous"); GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT); } g_queue_push_tail (demux->queue, buf); GST_TASK_SIGNAL (demux->task); gst_adapter_clear (demux->download); return TRUE; }