gstreamer/gst/hls/gsthlsdemux.c

1117 lines
33 KiB
C

/* GStreamer
* Copyright (C) 2010 Marc-Andre Lureau <marcandre.lureau@gmail.com>
* Copyright (C) 2010 Andoni Morales Alastruey <ylatuya@gmail.com>
*
* 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.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch souphttpsrc location=http://devimages.apple.com/iphone/samples/bipbop/gear4/prog_index.m3u8 ! hlsdemux ! decodebin2 ! ffmpegcolorspace ! videoscale ! autovideosink
* ]|
* </refsect2>
*
* Last reviewed on 2010-10-07
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <gst/base/gsttypefindhelper.h>
#include "gsthlsdemux.h"
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src%d",
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/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 <marcandre.lureau@gmail.com>\n"
"Andoni Morales Alastruey <ylatuya@gmail.com>");
}
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);
/* 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);
demux->do_typefind = 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);
demux->position = 0;
}
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;
}
case GST_EVENT_NEWSEGMENT:
/* Swallow newsegments, we'll push our own */
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;
GstFormat fmt;
gst_query_parse_duration (query, &fmt, NULL);
if (fmt == GST_FORMAT_TIME) {
duration = gst_m3u8_client_get_duration (hlsdemux->client);
if (GST_CLOCK_TIME_IS_VALID (duration) && duration > 0) {
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;
case GST_QUERY_SEEKING:{
GstFormat fmt;
gint stop = -1;
gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
if (fmt == GST_FORMAT_TIME) {
GstClockTime duration;
duration = gst_m3u8_client_get_duration (hlsdemux->client);
if (GST_CLOCK_TIME_IS_VALID (duration) && duration > 0)
stop = duration;
}
gst_query_set_seeking (query, fmt, FALSE, 0, stop);
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 fed 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
switch_pads (GstHLSDemux * demux, GstCaps * newcaps)
{
GstPad *oldpad = demux->srcpad;
GST_DEBUG ("Switching pads (oldpad:%p)", oldpad);
/* First create and activate new pad */
demux->srcpad = gst_pad_new_from_static_template (&srctemplate, NULL);
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_pad_set_active (demux->srcpad, TRUE);
gst_pad_set_caps (demux->srcpad, newcaps);
gst_element_add_pad (GST_ELEMENT (demux), demux->srcpad);
gst_element_no_more_pads (GST_ELEMENT (demux));
if (oldpad) {
/* Push out EOS */
gst_pad_push_event (oldpad, gst_event_new_eos ());
gst_pad_set_active (oldpad, FALSE);
gst_element_remove_pad (GST_ELEMENT (demux), oldpad);
}
}
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);
/* Figure out if we need to create/switch pads */
if (G_UNLIKELY (!demux->srcpad
|| GST_BUFFER_CAPS (buf) != GST_PAD_CAPS (demux->srcpad))) {
switch_pads (demux, GST_BUFFER_CAPS (buf));
/* And send a newsegment */
gst_pad_push_event (demux->srcpad,
gst_event_new_new_segment (0, 1.0, GST_FORMAT_TIME, demux->position,
GST_CLOCK_TIME_NONE, demux->position));
}
if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buf)))
demux->position += GST_BUFFER_DURATION (buf);
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;
demux->do_typefind = TRUE;
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++) {
g_get_current_time (&demux->next_update);
g_time_val_add (&demux->next_update,
demux->client->current->targetduration * 1000000);
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;
gst_hls_demux_switch_playlist (demux);
}
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));
/* Force typefinding since we might have changed media type */
demux->do_typefind = TRUE;
return TRUE;
}
static gboolean
gst_hls_demux_schedule (GstHLSDemux * demux)
{
gfloat update_factor;
gint count;
/* As defined in §6.3.4. 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;
GST_DEBUG ("diff:%s%" GST_TIME_FORMAT ", limit:%" GST_TIME_FORMAT,
diff < 0 ? "-" : " ", GST_TIME_ARGS (ABS (diff)), GST_TIME_ARGS (limit));
/* 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;
GstClockTime duration;
GstClockTime timestamp;
gboolean discont;
if (!gst_m3u8_client_get_next_fragment (demux->client, &discont,
&next_fragment_uri, &duration, &timestamp)) {
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);
GST_BUFFER_DURATION (buf) = duration;
GST_BUFFER_TIMESTAMP (buf) = timestamp;
/* We actually need to do this every time we switch bitrate */
if (G_UNLIKELY (demux->do_typefind)) {
GstCaps *caps = gst_type_find_helper_for_buffer (NULL, buf, NULL);
if (!demux->input_caps || !gst_caps_is_equal (caps, demux->input_caps)) {
gst_caps_replace (&demux->input_caps, caps);
/* gst_pad_set_caps (demux->srcpad, demux->input_caps); */
GST_INFO_OBJECT (demux, "Input source caps: %" GST_PTR_FORMAT,
demux->input_caps);
demux->do_typefind = FALSE;
} else
gst_caps_unref (caps);
}
gst_buffer_set_caps (buf, 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;
}