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gstreamer/ext/hls/gsthlsdemux.c
Sebastian Dröge 775c5600c9 hlsdemux: Also refetch the playlist after the first fragment failure 
Previously we only refetched the playlist if downloading a fragment
has failed once. We should also do that if it failed a second or third time,
chances are that the playlist was updated now and contains new URIs.
2014-09-15 13:33:45 +03:00

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/* GStreamer
* Copyright (C) 2010 Marc-Andre Lureau <marcandre.lureau@gmail.com>
* Copyright (C) 2010 Andoni Morales Alastruey <ylatuya@gmail.com>
* Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
* Author: Youness Alaoui <youness.alaoui@collabora.co.uk>, Collabora Ltd.
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
* Copyright (C) 2014 Sebastian Dröge <sebastian@centricular.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, 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 ! videoconvert ! videoscale ! autovideosink
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <gst/base/gsttypefindhelper.h>
#include "gsthlsdemux.h"
#define GST_ELEMENT_ERROR_FROM_ERROR(el, msg, err) G_STMT_START { \
gchar *__dbg = g_strdup_printf ("%s: %s", msg, err->message); \
GST_WARNING_OBJECT (el, "error: %s", __dbg); \
gst_element_message_full (GST_ELEMENT(el), GST_MESSAGE_ERROR, \
err->domain, err->code, \
NULL, __dbg, __FILE__, GST_FUNCTION, __LINE__); \
g_clear_error (&err); \
} G_STMT_END
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src_%u",
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"));
GST_DEBUG_CATEGORY_STATIC (gst_hls_demux_debug);
#define GST_CAT_DEFAULT gst_hls_demux_debug
enum
{
PROP_0,
PROP_FRAGMENTS_CACHE,
PROP_BITRATE_LIMIT,
PROP_CONNECTION_SPEED,
PROP_LAST
};
#define DEFAULT_FRAGMENTS_CACHE 1
#define DEFAULT_FAILED_COUNT 3
#define DEFAULT_BITRATE_LIMIT 0.8
#define DEFAULT_CONNECTION_SPEED 0
/* 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);
static void gst_hls_demux_handle_message (GstBin * bin, GstMessage * msg);
/* GstHLSDemux */
static GstFlowReturn gst_hls_demux_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static gboolean gst_hls_demux_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_hls_demux_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_hls_demux_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static void gst_hls_demux_stream_loop (GstHLSDemux * demux);
static void gst_hls_demux_updates_loop (GstHLSDemux * demux);
static void gst_hls_demux_stop (GstHLSDemux * demux);
static void gst_hls_demux_pause_tasks (GstHLSDemux * demux);
static gboolean gst_hls_demux_switch_playlist (GstHLSDemux * demux);
static gboolean gst_hls_demux_get_next_fragment (GstHLSDemux * demux,
gboolean * end_of_playlist, GError ** err);
static gboolean gst_hls_demux_update_playlist (GstHLSDemux * demux,
gboolean update, GError ** err);
static void gst_hls_demux_reset (GstHLSDemux * demux, gboolean dispose);
static gboolean gst_hls_demux_set_location (GstHLSDemux * demux,
const gchar * uri, const gchar * base_uri);
static gchar *gst_hls_src_buf_to_utf8_playlist (GstBuffer * buf);
static gboolean gst_hls_demux_change_playlist (GstHLSDemux * demux,
guint max_bitrate);
static GstBuffer *gst_hls_demux_decrypt_fragment (GstHLSDemux * demux,
GstBuffer * encrypted_buffer, GError ** err);
static gboolean
gst_hls_demux_decrypt_start (GstHLSDemux * demux, const guint8 * key_data,
const guint8 * iv_data);
static void gst_hls_demux_decrypt_end (GstHLSDemux * demux);
#define gst_hls_demux_parent_class parent_class
G_DEFINE_TYPE (GstHLSDemux, gst_hls_demux, GST_TYPE_BIN);
#define STATISTICS_MESSAGE_NAME "adaptive-streaming-statistics"
static void
gst_hls_demux_dispose (GObject * obj)
{
GstHLSDemux *demux = GST_HLS_DEMUX (obj);
if (demux->stream_task) {
gst_object_unref (demux->stream_task);
g_rec_mutex_clear (&demux->stream_lock);
demux->stream_task = NULL;
}
if (demux->updates_task) {
gst_object_unref (demux->updates_task);
g_rec_mutex_clear (&demux->updates_lock);
demux->updates_task = NULL;
}
if (demux->downloader != NULL) {
g_object_unref (demux->downloader);
demux->downloader = NULL;
}
gst_hls_demux_reset (demux, TRUE);
if (demux->src_srcpad) {
gst_object_unref (demux->src_srcpad);
demux->src_srcpad = NULL;
}
g_mutex_clear (&demux->download_lock);
g_cond_clear (&demux->download_cond);
g_mutex_clear (&demux->updates_timed_lock);
g_cond_clear (&demux->updates_timed_cond);
g_mutex_clear (&demux->fragment_download_lock);
g_cond_clear (&demux->fragment_download_cond);
G_OBJECT_CLASS (parent_class)->dispose (obj);
}
static void
gst_hls_demux_class_init (GstHLSDemuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
GstBinClass *bin_class;
gobject_class = (GObjectClass *) klass;
element_class = (GstElementClass *) klass;
bin_class = (GstBinClass *) 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 "
"(DEPRECATED: Has no effect since 1.3.1)",
1, G_MAXUINT, DEFAULT_FRAGMENTS_CACHE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_BITRATE_LIMIT,
g_param_spec_float ("bitrate-limit",
"Bitrate limit in %",
"Limit of the available bitrate to use when switching to alternates.",
0, 1, DEFAULT_BITRATE_LIMIT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_CONNECTION_SPEED,
g_param_spec_uint ("connection-speed", "Connection Speed",
"Network connection speed in kbps (0 = unknown)",
0, G_MAXUINT / 1000, DEFAULT_CONNECTION_SPEED,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
element_class->change_state = GST_DEBUG_FUNCPTR (gst_hls_demux_change_state);
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_static_metadata (element_class,
"HLS Demuxer",
"Codec/Demuxer/Adaptive",
"HTTP Live Streaming demuxer",
"Marc-Andre Lureau <marcandre.lureau@gmail.com>\n"
"Andoni Morales Alastruey <ylatuya@gmail.com>");
bin_class->handle_message = gst_hls_demux_handle_message;
GST_DEBUG_CATEGORY_INIT (gst_hls_demux_debug, "hlsdemux", 0,
"hlsdemux element");
}
static void
gst_hls_demux_init (GstHLSDemux * demux)
{
/* 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);
/* Downloader */
demux->downloader = gst_uri_downloader_new ();
demux->do_typefind = TRUE;
/* Properties */
demux->bitrate_limit = DEFAULT_BITRATE_LIMIT;
demux->connection_speed = DEFAULT_CONNECTION_SPEED;
g_mutex_init (&demux->download_lock);
g_cond_init (&demux->download_cond);
g_mutex_init (&demux->updates_timed_lock);
g_cond_init (&demux->updates_timed_cond);
g_mutex_init (&demux->fragment_download_lock);
g_cond_init (&demux->fragment_download_cond);
/* Updates task */
g_rec_mutex_init (&demux->updates_lock);
demux->updates_task =
gst_task_new ((GstTaskFunction) gst_hls_demux_updates_loop, demux, NULL);
gst_task_set_lock (demux->updates_task, &demux->updates_lock);
/* Streaming task */
g_rec_mutex_init (&demux->stream_lock);
demux->stream_task =
gst_task_new ((GstTaskFunction) gst_hls_demux_stream_loop, demux, NULL);
gst_task_set_lock (demux->stream_task, &demux->stream_lock);
demux->have_group_id = FALSE;
demux->group_id = G_MAXUINT;
}
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:
break;
case PROP_BITRATE_LIMIT:
demux->bitrate_limit = g_value_get_float (value);
break;
case PROP_CONNECTION_SPEED:
demux->connection_speed = g_value_get_uint (value) * 1000;
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, 1);
break;
case PROP_BITRATE_LIMIT:
g_value_set_float (value, demux->bitrate_limit);
break;
case PROP_CONNECTION_SPEED:
g_value_set_uint (value, demux->connection_speed / 1000);
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_READY_TO_PAUSED:
gst_hls_demux_reset (demux, FALSE);
gst_uri_downloader_reset (demux->downloader);
break;
case GST_STATE_CHANGE_NULL_TO_READY:
demux->adapter = gst_adapter_new ();
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_hls_demux_stop (demux);
gst_task_join (demux->updates_task);
gst_task_join (demux->stream_task);
gst_hls_demux_reset (demux, FALSE);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
gst_object_unref (demux->adapter);
demux->adapter = NULL;
break;
default:
break;
}
return ret;
}
static void
gst_hls_demux_handle_message (GstBin * bin, GstMessage * msg)
{
GstHLSDemux *demux = GST_HLS_DEMUX_CAST (bin);
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_ERROR:{
GError *err = NULL;
gchar *debug = NULL;
gchar *new_error = NULL;
gst_message_parse_error (msg, &err, &debug);
GST_WARNING_OBJECT (demux, "Source posted error: %d:%d %s (%s)",
err->domain, err->code, err->message, debug);
if (debug)
new_error = g_strdup_printf ("%s: %s\n", err->message, debug);
if (new_error) {
g_free (err->message);
err->message = new_error;
}
/* error, but ask to retry */
g_mutex_lock (&demux->fragment_download_lock);
demux->last_ret = GST_FLOW_CUSTOM_ERROR;
g_clear_error (&demux->last_error);
demux->last_error = g_error_copy (err);
g_cond_signal (&demux->fragment_download_cond);
g_mutex_unlock (&demux->fragment_download_lock);
g_error_free (err);
g_free (debug);
gst_message_unref (msg);
msg = NULL;
}
break;
default:
break;
}
if (msg)
GST_BIN_CLASS (parent_class)->handle_message (bin, msg);
}
static gboolean
gst_hls_demux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstHLSDemux *demux;
demux = GST_HLS_DEMUX (parent);
switch (event->type) {
case GST_EVENT_SEEK:
{
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
GList *walk;
GstClockTime current_pos, target_pos;
gint64 current_sequence;
GstM3U8MediaFile *file;
GST_INFO_OBJECT (demux, "Received GST_EVENT_SEEK");
if (gst_m3u8_client_is_live (demux->client)) {
GST_WARNING_OBJECT (demux, "Received seek event for live stream");
gst_event_unref (event);
return FALSE;
}
gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
if (format != GST_FORMAT_TIME) {
gst_event_unref (event);
return FALSE;
}
GST_DEBUG_OBJECT (demux, "seek event, rate: %f start: %" GST_TIME_FORMAT
" stop: %" GST_TIME_FORMAT, rate, GST_TIME_ARGS (start),
GST_TIME_ARGS (stop));
if (flags & GST_SEEK_FLAG_FLUSH) {
GST_DEBUG_OBJECT (demux, "sending flush start");
gst_pad_push_event (demux->srcpad, gst_event_new_flush_start ());
}
gst_hls_demux_pause_tasks (demux);
/* wait for streaming to finish */
g_rec_mutex_lock (&demux->updates_lock);
g_rec_mutex_unlock (&demux->updates_lock);
g_rec_mutex_lock (&demux->stream_lock);
/* properly cleanup pending decryption status */
if (flags & GST_SEEK_FLAG_FLUSH) {
if (demux->adapter)
gst_adapter_clear (demux->adapter);
if (demux->pending_buffer)
gst_buffer_unref (demux->pending_buffer);
demux->pending_buffer = NULL;
gst_hls_demux_decrypt_end (demux);
}
/* Use I-frame variants for trick modes */
if (demux->client->main->iframe_lists &&
rate < -1.0 && demux->segment.rate >= -1.0
&& demux->segment.rate <= 1.0) {
GError *err = NULL;
GST_M3U8_CLIENT_LOCK (demux->client);
/* Switch to I-frame variant */
demux->client->main->current_variant =
demux->client->main->iframe_lists;
GST_M3U8_CLIENT_UNLOCK (demux->client);
gst_m3u8_client_set_current (demux->client,
demux->client->main->iframe_lists->data);
gst_uri_downloader_reset (demux->downloader);
if (!gst_hls_demux_update_playlist (demux, FALSE, &err)) {
g_rec_mutex_unlock (&demux->stream_lock);
GST_ELEMENT_ERROR_FROM_ERROR (demux, "Could not switch playlist",
err);
gst_event_unref (event);
return FALSE;
}
demux->discont = TRUE;
demux->new_playlist = TRUE;
demux->do_typefind = TRUE;
gst_hls_demux_change_playlist (demux,
demux->current_download_rate * demux->bitrate_limit / ABS (rate));
} else if (rate > -1.0 && rate <= 1.0 && (demux->segment.rate < -1.0
|| demux->segment.rate > 1.0)) {
GError *err = NULL;
GST_M3U8_CLIENT_LOCK (demux->client);
/* Switch to normal variant */
demux->client->main->current_variant = demux->client->main->lists;
GST_M3U8_CLIENT_UNLOCK (demux->client);
gst_m3u8_client_set_current (demux->client,
demux->client->main->lists->data);
gst_uri_downloader_reset (demux->downloader);
if (!gst_hls_demux_update_playlist (demux, FALSE, &err)) {
g_rec_mutex_unlock (&demux->stream_lock);
GST_ELEMENT_ERROR_FROM_ERROR (demux, "Could not switch playlist",
err);
gst_event_unref (event);
return FALSE;
}
demux->discont = TRUE;
demux->new_playlist = TRUE;
demux->do_typefind = TRUE;
gst_hls_demux_change_playlist (demux,
demux->current_download_rate * demux->bitrate_limit);
}
GST_M3U8_CLIENT_LOCK (demux->client);
file = GST_M3U8_MEDIA_FILE (demux->client->current->files->data);
current_sequence = file->sequence;
current_pos = 0;
target_pos = rate > 0 ? start : stop;
/* FIXME: Here we need proper discont handling */
for (walk = demux->client->current->files; walk; walk = walk->next) {
file = walk->data;
current_sequence = file->sequence;
if (current_pos <= target_pos
&& target_pos < current_pos + file->duration) {
break;
}
current_pos += file->duration;
}
GST_M3U8_CLIENT_UNLOCK (demux->client);
if (walk == NULL) {
GST_DEBUG_OBJECT (demux, "seeking further than track duration");
current_sequence++;
}
GST_M3U8_CLIENT_LOCK (demux->client);
GST_DEBUG_OBJECT (demux, "seeking to sequence %u",
(guint) current_sequence);
demux->client->sequence = current_sequence;
demux->client->sequence_position = current_pos;
GST_M3U8_CLIENT_UNLOCK (demux->client);
gst_segment_do_seek (&demux->segment, rate, format, flags, start_type,
start, stop_type, stop, NULL);
demux->need_segment = TRUE;
if (flags & GST_SEEK_FLAG_FLUSH) {
GST_DEBUG_OBJECT (demux, "sending flush stop");
gst_pad_push_event (demux->srcpad, gst_event_new_flush_stop (TRUE));
}
demux->stop_updates_task = FALSE;
gst_uri_downloader_reset (demux->downloader);
demux->stop_stream_task = FALSE;
gst_task_start (demux->updates_task);
g_rec_mutex_unlock (&demux->stream_lock);
gst_event_unref (event);
return TRUE;
}
case GST_EVENT_LATENCY:{
/* Upstream and our internal source are irrelevant
* for latency, and we should not fail here to
* configure the latency */
gst_event_unref (event);
return TRUE;
}
default:
break;
}
return gst_pad_event_default (pad, parent, event);
}
static gboolean
gst_hls_demux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstHLSDemux *demux;
GstQuery *query;
gboolean ret;
demux = GST_HLS_DEMUX (parent);
switch (event->type) {
case GST_EVENT_EOS:{
gchar *playlist = NULL;
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) {
gboolean permanent;
gchar *uri, *redirect_uri;
gst_query_parse_uri (query, &uri);
gst_query_parse_uri_redirection (query, &redirect_uri);
gst_query_parse_uri_redirection_permanent (query, &permanent);
if (permanent && redirect_uri) {
gst_hls_demux_set_location (demux, redirect_uri, NULL);
} else {
gst_hls_demux_set_location (demux, uri, redirect_uri);
}
g_free (uri);
g_free (redirect_uri);
}
gst_query_unref (query);
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_element (GST_OBJECT_CAST (demux),
gst_structure_new (STATISTICS_MESSAGE_NAME,
"manifest-uri", G_TYPE_STRING,
gst_m3u8_client_get_uri (demux->client), "uri", G_TYPE_STRING,
gst_m3u8_client_get_uri (demux->client),
"manifest-download-start", GST_TYPE_CLOCK_TIME,
GST_CLOCK_TIME_NONE,
"manifest-download-stop", GST_TYPE_CLOCK_TIME,
gst_util_get_timestamp (), NULL)));
playlist = gst_hls_src_buf_to_utf8_playlist (demux->playlist);
demux->playlist = NULL;
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->updates_task);
gst_event_unref (event);
return TRUE;
}
case GST_EVENT_SEGMENT:
/* Swallow newsegments, we'll push our own */
gst_event_unref (event);
return TRUE;
default:
break;
}
return gst_pad_event_default (pad, parent, event);
}
static gboolean
gst_hls_demux_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstHLSDemux *hlsdemux;
gboolean ret = FALSE;
if (query == NULL)
return FALSE;
hlsdemux = GST_HLS_DEMUX (parent);
switch (query->type) {
case GST_QUERY_DURATION:{
GstClockTime duration = -1;
GstFormat fmt;
gst_query_parse_duration (query, &fmt, NULL);
if (fmt == GST_FORMAT_TIME) {
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;
}
}
GST_INFO_OBJECT (hlsdemux, "GST_QUERY_DURATION returns %s with duration %"
GST_TIME_FORMAT, ret ? "TRUE" : "FALSE", GST_TIME_ARGS (duration));
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, gst_m3u8_client_get_uri (hlsdemux->client));
ret = TRUE;
}
break;
case GST_QUERY_SEEKING:{
GstFormat fmt;
gint64 stop = -1;
gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
GST_INFO_OBJECT (hlsdemux, "Received GST_QUERY_SEEKING with format %d",
fmt);
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,
!gst_m3u8_client_is_live (hlsdemux->client), 0, stop);
ret = TRUE;
GST_INFO_OBJECT (hlsdemux, "GST_QUERY_SEEKING returning with stop : %"
GST_TIME_FORMAT, GST_TIME_ARGS (stop));
}
break;
}
default:
/* Don't fordward queries upstream because of the special nature of this
* "demuxer", which relies on the upstream element only to be fed with the
* first playlist */
break;
}
return ret;
}
static GstFlowReturn
gst_hls_demux_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstHLSDemux *demux = GST_HLS_DEMUX (parent);
if (demux->playlist == NULL)
demux->playlist = buf;
else
demux->playlist = gst_buffer_append (demux->playlist, buf);
return GST_FLOW_OK;
}
static void
gst_hls_demux_pause_tasks (GstHLSDemux * demux)
{
if (GST_TASK_STATE (demux->updates_task) != GST_TASK_STOPPED) {
g_mutex_lock (&demux->updates_timed_lock);
demux->stop_updates_task = TRUE;
g_cond_signal (&demux->updates_timed_cond);
g_mutex_unlock (&demux->updates_timed_lock);
gst_uri_downloader_cancel (demux->downloader);
gst_task_pause (demux->updates_task);
}
if (GST_TASK_STATE (demux->stream_task) != GST_TASK_STOPPED) {
g_mutex_lock (&demux->download_lock);
demux->stop_stream_task = TRUE;
g_cond_signal (&demux->download_cond);
g_mutex_unlock (&demux->download_lock);
g_mutex_lock (&demux->fragment_download_lock);
g_cond_signal (&demux->fragment_download_cond);
g_mutex_unlock (&demux->fragment_download_lock);
gst_task_pause (demux->stream_task);
}
}
static void
gst_hls_demux_stop (GstHLSDemux * demux)
{
if (GST_TASK_STATE (demux->updates_task) != GST_TASK_STOPPED) {
g_mutex_lock (&demux->updates_timed_lock);
demux->stop_updates_task = TRUE;
g_cond_signal (&demux->updates_timed_cond);
g_mutex_unlock (&demux->updates_timed_lock);
gst_uri_downloader_cancel (demux->downloader);
gst_task_stop (demux->updates_task);
g_rec_mutex_lock (&demux->updates_lock);
g_rec_mutex_unlock (&demux->updates_lock);
}
if (GST_TASK_STATE (demux->stream_task) != GST_TASK_STOPPED) {
g_mutex_lock (&demux->download_lock);
demux->stop_stream_task = TRUE;
g_cond_signal (&demux->download_cond);
g_mutex_unlock (&demux->download_lock);
g_mutex_lock (&demux->fragment_download_lock);
g_cond_signal (&demux->fragment_download_cond);
g_mutex_unlock (&demux->fragment_download_lock);
gst_task_stop (demux->stream_task);
g_rec_mutex_lock (&demux->stream_lock);
g_rec_mutex_unlock (&demux->stream_lock);
}
}
static GstFlowReturn
_src_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstPad *srcpad = (GstPad *) parent;
GstHLSDemux *demux = (GstHLSDemux *) GST_PAD_PARENT (srcpad);
GstFlowReturn ret;
GstCaps *caps;
/* Is it encrypted? */
if (demux->current_key) {
GError *err = NULL;
GstBuffer *tmp_buffer;
gsize available;
/* restart the decrypting lib for a new fragment */
if (demux->reset_crypto) {
GstFragment *key_fragment;
GstBuffer *key_buffer;
GstMapInfo key_info;
/* new key? */
if (demux->key_url && strcmp (demux->key_url, demux->current_key) == 0) {
key_fragment = g_object_ref (demux->key_fragment);
} else {
g_free (demux->key_url);
demux->key_url = NULL;
if (demux->key_fragment)
g_object_unref (demux->key_fragment);
demux->key_fragment = NULL;
GST_INFO_OBJECT (demux, "Fetching key %s", demux->current_key);
key_fragment =
gst_uri_downloader_fetch_uri (demux->downloader,
demux->current_key, demux->client->main ?
demux->client->main->uri : NULL, FALSE, FALSE,
demux->client->current ? demux->client->current->allowcache : TRUE,
&err);
if (key_fragment == NULL)
goto key_failed;
demux->key_url = g_strdup (demux->current_key);
demux->key_fragment = g_object_ref (key_fragment);
}
key_buffer = gst_fragment_get_buffer (key_fragment);
gst_buffer_map (key_buffer, &key_info, GST_MAP_READ);
gst_hls_demux_decrypt_start (demux, key_info.data, demux->current_iv);
gst_buffer_unmap (key_buffer, &key_info);
gst_buffer_unref (key_buffer);
g_object_unref (key_fragment);
demux->reset_crypto = FALSE;
}
gst_adapter_push (demux->adapter, buffer);
/* must be a multiple of 16 */
available = gst_adapter_available (demux->adapter) & (~0xF);
if (available == 0) {
return GST_FLOW_OK;
}
buffer = gst_adapter_take_buffer (demux->adapter, available);
buffer = gst_hls_demux_decrypt_fragment (demux, buffer, &err);
if (buffer == NULL) {
GST_ELEMENT_ERROR (demux, STREAM, DECODE, ("Failed to decrypt buffer"),
("decryption failed %s", err->message));
g_error_free (err);
demux->last_ret = GST_FLOW_ERROR;
return GST_FLOW_ERROR;
}
tmp_buffer = demux->pending_buffer;
demux->pending_buffer = buffer;
buffer = tmp_buffer;
}
if (!buffer) {
return GST_FLOW_OK;
}
if (demux->starting_fragment) {
GST_LOG_OBJECT (demux, "set buffer pts=%" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->current_timestamp));
GST_BUFFER_PTS (buffer) = demux->current_timestamp;
if (demux->segment.rate < 0)
/* Set DISCONT flag for every first buffer in reverse playback mode
* as each fragment for its own has to be reversed */
demux->discont = TRUE;
demux->starting_fragment = FALSE;
demux->segment.position = GST_BUFFER_PTS (buffer);
} else {
GST_BUFFER_PTS (buffer) = GST_CLOCK_TIME_NONE;
}
GST_BUFFER_DURATION (buffer) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DTS (buffer) = GST_CLOCK_TIME_NONE;
/* We actually need to do this every time we switch bitrate */
if (G_UNLIKELY (demux->do_typefind)) {
caps = gst_type_find_helper_for_buffer (NULL, buffer, NULL);
if (G_UNLIKELY (!caps)) {
GST_ELEMENT_ERROR (demux, STREAM, TYPE_NOT_FOUND,
("Could not determine type of stream"), (NULL));
gst_buffer_unref (buffer);
demux->last_ret = GST_FLOW_NOT_NEGOTIATED;
return GST_FLOW_NOT_NEGOTIATED;
}
if (!demux->input_caps || !gst_caps_is_equal (caps, demux->input_caps)) {
gst_caps_replace (&demux->input_caps, caps);
GST_INFO_OBJECT (demux, "Input source caps: %" GST_PTR_FORMAT,
demux->input_caps);
}
gst_pad_set_caps (srcpad, caps);
demux->do_typefind = FALSE;
gst_caps_unref (caps);
}
if (demux->discont) {
GST_DEBUG_OBJECT (demux, "Marking fragment as discontinuous");
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
demux->discont = FALSE;
} else {
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DISCONT);
}
demux->starting_fragment = FALSE;
if (demux->need_segment) {
/* And send a newsegment */
GST_DEBUG_OBJECT (demux, "Sending segment event: %"
GST_SEGMENT_FORMAT, &demux->segment);
gst_pad_push_event (demux->srcpad, gst_event_new_segment (&demux->segment));
demux->need_segment = FALSE;
}
/* accumulate time and size to get this chunk */
demux->download_total_time +=
g_get_monotonic_time () - demux->download_start_time;
demux->download_total_bytes += gst_buffer_get_size (buffer);
ret = gst_proxy_pad_chain_default (pad, parent, buffer);
demux->download_start_time = g_get_monotonic_time ();
if (ret != GST_FLOW_OK) {
if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
GST_ELEMENT_ERROR (demux, STREAM, FAILED, (NULL),
("stream stopped, reason %s", gst_flow_get_name (ret)));
gst_pad_push_event (demux->srcpad, gst_event_new_eos ());
} else {
GST_DEBUG_OBJECT (demux, "stream stopped, reason %s",
gst_flow_get_name (ret));
}
gst_hls_demux_pause_tasks (demux);
}
/* avoid having the source handle the same error again */
demux->last_ret = ret;
ret = GST_FLOW_OK;
return ret;
key_failed:
/* TODO Raise this error to the user */
GST_WARNING_OBJECT (demux, "Failed to decrypt data");
demux->last_ret = GST_FLOW_ERROR;
return GST_FLOW_ERROR;
}
static gboolean
_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstPad *srcpad = GST_PAD_CAST (parent);
GstHLSDemux *demux = (GstHLSDemux *) GST_PAD_PARENT (srcpad);;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
if (demux->current_key)
gst_hls_demux_decrypt_end (demux);
/* ideally this should be empty, but this eos might have been
* caused by an error on the source element */
GST_DEBUG_OBJECT (demux, "Data still on the adapter when EOS was received"
": %" G_GSIZE_FORMAT, gst_adapter_available (demux->adapter));
gst_adapter_clear (demux->adapter);
/* pending buffer is only used for encrypted streams */
if (demux->last_ret == GST_FLOW_OK) {
if (demux->pending_buffer) {
GstMapInfo info;
gsize unpadded_size;
/* Handle pkcs7 unpadding here */
gst_buffer_map (demux->pending_buffer, &info, GST_MAP_READ);
unpadded_size = info.size - info.data[info.size - 1];
gst_buffer_unmap (demux->pending_buffer, &info);
gst_buffer_resize (demux->pending_buffer, 0, unpadded_size);
demux->download_total_time +=
g_get_monotonic_time () - demux->download_start_time;
demux->download_total_bytes +=
gst_buffer_get_size (demux->pending_buffer);
demux->last_ret = gst_pad_push (demux->srcpad, demux->pending_buffer);
demux->pending_buffer = NULL;
}
} else {
if (demux->pending_buffer)
gst_buffer_unref (demux->pending_buffer);
demux->pending_buffer = NULL;
}
GST_DEBUG_OBJECT (demux, "Fragment download finished");
g_mutex_lock (&demux->fragment_download_lock);
g_cond_signal (&demux->fragment_download_cond);
g_mutex_unlock (&demux->fragment_download_lock);
break;
default:
break;
}
gst_event_unref (event);
return TRUE;
}
static gboolean
_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_ALLOCATION:
return FALSE;
break;
default:
break;
}
return gst_pad_query_default (pad, parent, query);
}
static void
switch_pads (GstHLSDemux * demux)
{
GstPad *oldpad = demux->srcpad;
GstEvent *event;
gchar *stream_id;
gchar *name;
GstPadTemplate *tmpl;
GstProxyPad *internal_pad;
GST_DEBUG_OBJECT (demux, "Switching pad (oldpad:%p)", oldpad);
if (oldpad) {
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (oldpad), NULL);
}
/* First create and activate new pad */
name = g_strdup_printf ("src_%u", demux->srcpad_counter++);
tmpl = gst_static_pad_template_get (&srctemplate);
demux->srcpad =
gst_ghost_pad_new_from_template (name, demux->src_srcpad, tmpl);
gst_object_unref (tmpl);
g_free (name);
/* set up our internal pad to drop all events from
* the http src we don't care about. On the chain function
* we just push the buffer forward, but this way hls can get
* the flow return from downstream */
internal_pad = gst_proxy_pad_get_internal (GST_PROXY_PAD (demux->srcpad));
gst_pad_set_chain_function (GST_PAD_CAST (internal_pad), _src_chain);
gst_pad_set_event_function (GST_PAD_CAST (internal_pad), _src_event);
/* need to set query otherwise deadlocks happen with allocation queries */
gst_pad_set_query_function (GST_PAD_CAST (internal_pad), _src_query);
gst_object_unref (internal_pad);
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_use_fixed_caps (demux->srcpad);
gst_pad_set_active (demux->srcpad, TRUE);
stream_id =
gst_pad_create_stream_id (demux->srcpad, GST_ELEMENT_CAST (demux), NULL);
event = gst_pad_get_sticky_event (demux->sinkpad, GST_EVENT_STREAM_START, 0);
if (event) {
if (gst_event_parse_group_id (event, &demux->group_id))
demux->have_group_id = TRUE;
else
demux->have_group_id = FALSE;
gst_event_unref (event);
} else if (!demux->have_group_id) {
demux->have_group_id = TRUE;
demux->group_id = gst_util_group_id_next ();
}
event = gst_event_new_stream_start (stream_id);
if (demux->have_group_id)
gst_event_set_group_id (event, demux->group_id);
gst_pad_push_event (demux->srcpad, event);
g_free (stream_id);
gst_element_add_pad (GST_ELEMENT (demux), demux->srcpad);
gst_element_no_more_pads (GST_ELEMENT (demux));
demux->new_playlist = FALSE;
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_configure_src_pad (GstHLSDemux * demux)
{
if (G_UNLIKELY (!demux->srcpad || demux->new_playlist)) {
switch_pads (demux);
demux->need_segment = TRUE;
}
}
static void
gst_hls_demux_stream_loop (GstHLSDemux * demux)
{
gboolean end_of_playlist;
GError *err = NULL;
/* This task will download fragments as fast as possible, sends
* SEGMENT and CAPS events and switches pads if necessary.
* If downloading a fragment fails we try again up to 3 times
* after waiting a bit. If we're at the end of the playlist
* we wait for the playlist to update before getting the next
* fragment.
*/
GST_DEBUG_OBJECT (demux, "Enter task");
if (demux->stop_stream_task)
goto pause_task;
/* Check if we're done with our segment */
if (demux->segment.rate > 0) {
if (GST_CLOCK_TIME_IS_VALID (demux->segment.stop)
&& demux->segment.position >= demux->segment.stop)
goto end_of_playlist;
} else {
if (GST_CLOCK_TIME_IS_VALID (demux->segment.start)
&& demux->segment.position < demux->segment.start)
goto end_of_playlist;
}
demux->next_download = g_get_monotonic_time ();
if (!gst_hls_demux_get_next_fragment (demux, &end_of_playlist, &err)) {
if (demux->stop_stream_task) {
g_clear_error (&err);
goto pause_task;
}
if (end_of_playlist) {
if (!gst_m3u8_client_is_live (demux->client)) {
GST_DEBUG_OBJECT (demux, "End of playlist");
demux->end_of_playlist = TRUE;
goto end_of_playlist;
} else {
g_mutex_lock (&demux->download_lock);
/* Wait until we're cancelled or there's something for
* us to download in the playlist or the playlist
* became non-live */
while (TRUE) {
if (demux->stop_stream_task) {
g_mutex_unlock (&demux->download_lock);
goto pause_task;
}
/* Got a new fragment or not live anymore? */
if (gst_m3u8_client_get_next_fragment (demux->client, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, demux->segment.rate > 0)
|| !gst_m3u8_client_is_live (demux->client))
break;
GST_DEBUG_OBJECT (demux,
"No fragment left but live playlist, wait a bit");
g_cond_wait (&demux->download_cond, &demux->download_lock);
}
g_mutex_unlock (&demux->download_lock);
GST_DEBUG_OBJECT (demux, "Retrying now");
return;
}
} else {
demux->download_failed_count++;
if (demux->download_failed_count <= DEFAULT_FAILED_COUNT) {
GST_WARNING_OBJECT (demux, "Could not fetch the next fragment");
g_clear_error (&err);
/* First try to update the playlist for non-live playlists
* in case the URIs have changed in the meantime. But only
* try it the first time, after that we're going to wait a
* a bit to not flood the server */
if (demux->download_failed_count == 1
&& !gst_m3u8_client_is_live (demux->client)
&& gst_hls_demux_update_playlist (demux, FALSE, &err)) {
/* Retry immediately, the playlist actually has changed */
GST_DEBUG_OBJECT (demux, "Updated the playlist");
return;
} else {
/* Wait half the fragment duration before retrying */
demux->next_download +=
gst_util_uint64_scale
(gst_m3u8_client_get_current_fragment_duration (demux->client),
G_USEC_PER_SEC, 2 * GST_SECOND);
}
g_clear_error (&err);
g_mutex_lock (&demux->download_lock);
if (demux->stop_stream_task) {
g_mutex_unlock (&demux->download_lock);
goto pause_task;
}
g_cond_wait_until (&demux->download_cond, &demux->download_lock,
demux->next_download);
g_mutex_unlock (&demux->download_lock);
GST_DEBUG_OBJECT (demux, "Retrying now");
/* Refetch the playlist now after we waited */
if (!gst_m3u8_client_is_live (demux->client)
&& gst_hls_demux_update_playlist (demux, FALSE, &err)) {
GST_DEBUG_OBJECT (demux, "Updated the playlist");
}
return;
} else {
GST_ELEMENT_ERROR_FROM_ERROR (demux,
"Could not fetch the next fragment", err);
goto pause_task;
}
}
} else {
demux->download_failed_count = 0;
gst_m3u8_client_advance_fragment (demux->client, demux->segment.rate > 0);
if (demux->stop_updates_task) {
goto pause_task;
}
}
if (demux->stop_updates_task) {
goto pause_task;
}
/* try to switch to another bitrate if needed */
/* FIXME: Currently several issues have be found when letting bitrate adaptation
* happen using trick modes (such as 'All streams finished without buffers') and
* the adaptive algorithm does not properly behave. */
if (demux->segment.rate == 1.0)
gst_hls_demux_switch_playlist (demux);
demux->download_total_bytes = 0;
demux->download_total_time = 0;
GST_DEBUG_OBJECT (demux, "Finished pushing fragment");
return;
end_of_playlist:
{
GST_DEBUG_OBJECT (demux, "Reached end of playlist, sending EOS");
gst_hls_demux_configure_src_pad (demux);
gst_pad_push_event (demux->srcpad, gst_event_new_eos ());
gst_hls_demux_pause_tasks (demux);
return;
}
pause_task:
{
GST_DEBUG_OBJECT (demux, "Pause task");
/* Pausing a stopped task will start it */
gst_hls_demux_pause_tasks (demux);
return;
}
}
static void
gst_hls_demux_reset (GstHLSDemux * demux, gboolean dispose)
{
demux->end_of_playlist = FALSE;
demux->stop_updates_task = FALSE;
demux->do_typefind = TRUE;
demux->download_failed_count = 0;
g_free (demux->key_url);
demux->key_url = NULL;
if (demux->key_fragment)
g_object_unref (demux->key_fragment);
demux->key_fragment = NULL;
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;
}
if (demux->client) {
gst_m3u8_client_free (demux->client);
demux->client = NULL;
}
if (!dispose) {
demux->client = gst_m3u8_client_new ("", NULL);
}
gst_segment_init (&demux->segment, GST_FORMAT_TIME);
demux->need_segment = TRUE;
demux->discont = TRUE;
demux->have_group_id = FALSE;
demux->group_id = G_MAXUINT;
demux->srcpad_counter = 0;
if (demux->srcpad) {
gst_element_remove_pad (GST_ELEMENT_CAST (demux), demux->srcpad);
demux->srcpad = NULL;
}
if (demux->src) {
gst_element_set_state (demux->src, GST_STATE_NULL);
}
g_clear_error (&demux->last_error);
if (demux->adapter)
gst_adapter_clear (demux->adapter);
if (demux->pending_buffer)
gst_buffer_unref (demux->pending_buffer);
demux->pending_buffer = NULL;
demux->current_key = NULL;
demux->current_iv = NULL;
gst_hls_demux_decrypt_end (demux);
demux->current_download_rate = -1;
}
static gboolean
gst_hls_demux_set_location (GstHLSDemux * demux, const gchar * uri,
const gchar * base_uri)
{
if (demux->client)
gst_m3u8_client_free (demux->client);
demux->client = gst_m3u8_client_new (uri, base_uri);
GST_INFO_OBJECT (demux, "Changed location: %s (base uri: %s)", uri,
GST_STR_NULL (base_uri));
return TRUE;
}
void
gst_hls_demux_updates_loop (GstHLSDemux * demux)
{
/* Loop for updating of the playlist. This periodically checks if
* the playlist is updated and does so, then signals the streaming
* thread in case it can continue downloading now.
* For non-live playlists this thread is not doing much else than
* setting up the initial playlist and then stopping. */
/* block until the next scheduled update or the signal to quit this thread */
GST_DEBUG_OBJECT (demux, "Started updates task");
/* 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 = NULL;
GError *err = NULL;
if (demux->connection_speed == 0) {
GST_M3U8_CLIENT_LOCK (demux->client);
child = demux->client->main->current_variant->data;
GST_M3U8_CLIENT_UNLOCK (demux->client);
} else {
GList *tmp = gst_m3u8_client_get_playlist_for_bitrate (demux->client,
demux->connection_speed);
child = GST_M3U8 (tmp->data);
}
gst_m3u8_client_set_current (demux->client, child);
if (!gst_hls_demux_update_playlist (demux, FALSE, &err)) {
GST_ELEMENT_ERROR_FROM_ERROR (demux, "Could not fetch the child playlist",
err);
goto error;
}
}
if (!gst_m3u8_client_is_live (demux->client)) {
GstClockTime duration = gst_m3u8_client_get_duration (demux->client);
GST_DEBUG_OBJECT (demux, "Sending duration message : %" GST_TIME_FORMAT,
GST_TIME_ARGS (duration));
if (duration != GST_CLOCK_TIME_NONE)
gst_element_post_message (GST_ELEMENT (demux),
gst_message_new_duration_changed (GST_OBJECT (demux)));
}
/* Now start stream task */
gst_task_start (demux->stream_task);
demux->next_update =
g_get_monotonic_time () +
gst_util_uint64_scale (gst_m3u8_client_get_target_duration
(demux->client), G_USEC_PER_SEC, GST_SECOND);
/* Updating playlist only needed for live playlists */
while (gst_m3u8_client_is_live (demux->client)) {
GError *err = NULL;
/* Wait here until we should do the next update or we're cancelled */
GST_DEBUG_OBJECT (demux, "Wait for next playlist update");
g_mutex_lock (&demux->updates_timed_lock);
if (demux->stop_updates_task) {
g_mutex_unlock (&demux->updates_timed_lock);
goto quit;
}
g_cond_wait_until (&demux->updates_timed_cond, &demux->updates_timed_lock,
demux->next_update);
if (demux->stop_updates_task) {
g_mutex_unlock (&demux->updates_timed_lock);
goto quit;
}
g_mutex_unlock (&demux->updates_timed_lock);
GST_DEBUG_OBJECT (demux, "Updating playlist");
if (!gst_hls_demux_update_playlist (demux, TRUE, &err)) {
if (demux->stop_updates_task)
goto quit;
demux->client->update_failed_count++;
if (demux->client->update_failed_count <= DEFAULT_FAILED_COUNT) {
GST_WARNING_OBJECT (demux, "Could not update the playlist");
demux->next_update =
g_get_monotonic_time () +
gst_util_uint64_scale (gst_m3u8_client_get_target_duration
(demux->client), G_USEC_PER_SEC, 2 * GST_SECOND);
} else {
GST_ELEMENT_ERROR_FROM_ERROR (demux, "Could not update playlist", err);
goto error;
}
} else {
GST_DEBUG_OBJECT (demux, "Updated playlist successfully");
demux->next_update =
g_get_monotonic_time () +
gst_util_uint64_scale (gst_m3u8_client_get_target_duration
(demux->client), G_USEC_PER_SEC, GST_SECOND);
/* Wake up download task */
g_mutex_lock (&demux->download_lock);
g_cond_signal (&demux->download_cond);
g_mutex_unlock (&demux->download_lock);
}
}
quit:
{
GST_DEBUG_OBJECT (demux, "Stopped updates task");
gst_task_pause (demux->updates_task);
return;
}
error:
{
GST_DEBUG_OBJECT (demux, "Stopped updates task because of error");
gst_hls_demux_pause_tasks (demux);
}
}
static gchar *
gst_hls_src_buf_to_utf8_playlist (GstBuffer * buf)
{
GstMapInfo info;
gchar *playlist;
if (!gst_buffer_map (buf, &info, GST_MAP_READ))
goto map_error;
if (!g_utf8_validate ((gchar *) info.data, info.size, NULL))
goto validate_error;
/* alloc size + 1 to end with a null character */
playlist = g_malloc0 (info.size + 1);
memcpy (playlist, info.data, info.size);
gst_buffer_unmap (buf, &info);
gst_buffer_unref (buf);
return playlist;
validate_error:
gst_buffer_unmap (buf, &info);
map_error:
gst_buffer_unref (buf);
return NULL;
}
static gboolean
gst_hls_demux_update_playlist (GstHLSDemux * demux, gboolean update,
GError ** err)
{
GstFragment *download;
GstBuffer *buf;
gchar *playlist;
gboolean main_checked = FALSE, updated = FALSE;
const gchar *uri;
retry:
uri = gst_m3u8_client_get_current_uri (demux->client);
download =
gst_uri_downloader_fetch_uri (demux->downloader, uri,
demux->client->main ? demux->client->main->uri : NULL, TRUE, TRUE, TRUE,
err);
if (download == NULL) {
if (update && !main_checked
&& gst_m3u8_client_has_variant_playlist (demux->client)
&& demux->client->main) {
GError *err2 = NULL;
GST_INFO_OBJECT (demux,
"Updating playlist %s failed, attempt to refresh variant playlist %s",
uri, demux->client->main->uri);
download =
gst_uri_downloader_fetch_uri (demux->downloader,
demux->client->main->uri, NULL, TRUE, TRUE, TRUE, &err2);
g_clear_error (&err2);
if (download != NULL) {
gchar *base_uri;
buf = gst_fragment_get_buffer (download);
playlist = gst_hls_src_buf_to_utf8_playlist (buf);
if (playlist == NULL) {
GST_WARNING_OBJECT (demux,
"Failed to validate variant playlist encoding");
return FALSE;
}
if (download->redirect_permanent && download->redirect_uri) {
uri = download->redirect_uri;
base_uri = NULL;
} else {
uri = download->uri;
base_uri = download->redirect_uri;
}
if (!gst_m3u8_client_update_variant_playlist (demux->client, playlist,
uri, base_uri)) {
GST_WARNING_OBJECT (demux, "Failed to update the variant playlist");
return FALSE;
}
g_object_unref (download);
g_clear_error (err);
main_checked = TRUE;
goto retry;
} else {
return FALSE;
}
} else {
return FALSE;
}
}
/* Set the base URI of the playlist to the redirect target if any */
GST_M3U8_CLIENT_LOCK (demux->client);
g_free (demux->client->current->uri);
g_free (demux->client->current->base_uri);
if (download->redirect_permanent && download->redirect_uri) {
demux->client->current->uri = g_strdup (download->redirect_uri);
demux->client->current->base_uri = NULL;
} else {
demux->client->current->uri = g_strdup (download->uri);
demux->client->current->base_uri = g_strdup (download->redirect_uri);
}
GST_M3U8_CLIENT_UNLOCK (demux->client);
buf = gst_fragment_get_buffer (download);
playlist = gst_hls_src_buf_to_utf8_playlist (buf);
if (playlist == NULL) {
GST_WARNING_OBJECT (demux, "Couldn't validate playlist encoding");
g_set_error (err, GST_STREAM_ERROR, GST_STREAM_ERROR_WRONG_TYPE,
"Couldn't validate playlist encoding");
g_object_unref (download);
return FALSE;
}
updated = gst_m3u8_client_update (demux->client, playlist);
if (!updated) {
GST_WARNING_OBJECT (demux, "Couldn't update playlist");
g_set_error (err, GST_STREAM_ERROR, GST_STREAM_ERROR_FAILED,
"Couldn't update playlist");
g_object_unref (download);
return FALSE;
}
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_element (GST_OBJECT_CAST (demux),
gst_structure_new (STATISTICS_MESSAGE_NAME,
"manifest-uri", G_TYPE_STRING,
gst_m3u8_client_get_uri (demux->client), "uri", G_TYPE_STRING,
gst_m3u8_client_get_current_uri (demux->client),
"manifest-download-start", GST_TYPE_CLOCK_TIME,
download->download_start_time,
"manifest-download-stop", GST_TYPE_CLOCK_TIME,
download->download_stop_time, NULL)));
g_object_unref (download);
/* If it's a live source, do not let the sequence number go beyond
* three fragments before the end of the list */
if (update == FALSE && demux->client->current &&
gst_m3u8_client_is_live (demux->client)) {
gint64 last_sequence;
GST_M3U8_CLIENT_LOCK (demux->client);
last_sequence =
GST_M3U8_MEDIA_FILE (g_list_last (demux->client->current->
files)->data)->sequence;
if (demux->client->sequence >= last_sequence - 3) {
GST_DEBUG_OBJECT (demux, "Sequence is beyond playlist. Moving back to %u",
(guint) (last_sequence - 3));
demux->need_segment = TRUE;
demux->client->sequence = last_sequence - 3;
}
GST_M3U8_CLIENT_UNLOCK (demux->client);
} else if (demux->client->current && !gst_m3u8_client_is_live (demux->client)) {
GstClockTime current_pos, target_pos;
guint sequence = 0;
GList *walk;
/* Sequence numbers are not guaranteed to be the same in different
* playlists, so get the correct fragment here based on the current
* position
*/
GST_M3U8_CLIENT_LOCK (demux->client);
current_pos = 0;
target_pos = demux->segment.position;
for (walk = demux->client->current->files; walk; walk = walk->next) {
GstM3U8MediaFile *file = walk->data;
sequence = file->sequence;
if (current_pos <= target_pos
&& target_pos < current_pos + file->duration) {
break;
}
current_pos += file->duration;
}
/* End of playlist */
if (!walk)
sequence++;
demux->client->sequence = sequence;
demux->client->sequence_position = current_pos;
GST_M3U8_CLIENT_UNLOCK (demux->client);
}
return updated;
}
static gboolean
gst_hls_demux_change_playlist (GstHLSDemux * demux, guint max_bitrate)
{
GList *previous_variant, *current_variant;
gint old_bandwidth, new_bandwidth;
/* If user specifies a connection speed never use a playlist with a bandwidth
* superior than it */
if (demux->connection_speed != 0 && max_bitrate > demux->connection_speed)
max_bitrate = demux->connection_speed;
previous_variant = demux->client->main->current_variant;
current_variant = gst_m3u8_client_get_playlist_for_bitrate (demux->client,
max_bitrate);
retry_failover_protection:
old_bandwidth = GST_M3U8 (previous_variant->data)->bandwidth;
new_bandwidth = GST_M3U8 (current_variant->data)->bandwidth;
/* Don't do anything else if the playlist is the same */
if (new_bandwidth == old_bandwidth) {
return TRUE;
}
demux->client->main->current_variant = current_variant;
GST_M3U8_CLIENT_UNLOCK (demux->client);
gst_m3u8_client_set_current (demux->client, current_variant->data);
GST_INFO_OBJECT (demux, "Client was on %dbps, max allowed is %dbps, switching"
" to bitrate %dbps", old_bandwidth, max_bitrate, new_bandwidth);
demux->discont = TRUE;
demux->new_playlist = TRUE;
if (gst_hls_demux_update_playlist (demux, FALSE, NULL)) {
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_element (GST_OBJECT_CAST (demux),
gst_structure_new (STATISTICS_MESSAGE_NAME,
"manifest-uri", G_TYPE_STRING,
gst_m3u8_client_get_uri (demux->client), "uri", G_TYPE_STRING,
gst_m3u8_client_get_current_uri (demux->client), "bitrate",
G_TYPE_INT, new_bandwidth, NULL)));
} else {
GList *failover = NULL;
GST_INFO_OBJECT (demux, "Unable to update playlist. Switching back");
GST_M3U8_CLIENT_LOCK (demux->client);
failover = g_list_previous (current_variant);
if (failover && new_bandwidth == GST_M3U8 (failover->data)->bandwidth) {
current_variant = failover;
goto retry_failover_protection;
}
demux->client->main->current_variant = previous_variant;
GST_M3U8_CLIENT_UNLOCK (demux->client);
gst_m3u8_client_set_current (demux->client, previous_variant->data);
/* Try a lower bitrate (or stop if we just tried the lowest) */
if (GST_M3U8 (previous_variant->data)->iframe && new_bandwidth ==
GST_M3U8 (g_list_first (demux->client->main->iframe_lists)->data)->
bandwidth)
return FALSE;
else if (!GST_M3U8 (previous_variant->data)->iframe && new_bandwidth ==
GST_M3U8 (g_list_first (demux->client->main->lists)->data)->bandwidth)
return FALSE;
else
return gst_hls_demux_change_playlist (demux, new_bandwidth - 1);
}
/* Force typefinding since we might have changed media type */
demux->do_typefind = TRUE;
return TRUE;
}
static gboolean
gst_hls_demux_switch_playlist (GstHLSDemux * demux)
{
gint64 bitrate;
/* compare the time when the fragment was downloaded with the time when it was
* scheduled */
bitrate =
(demux->download_total_bytes * 8) / ((double) demux->download_total_time /
G_GUINT64_CONSTANT (1000000));
GST_DEBUG_OBJECT (demux,
"Downloaded %u bytes in %" GST_TIME_FORMAT ". Bitrate is : %d",
(guint) demux->download_total_bytes,
GST_TIME_ARGS (demux->download_total_time * GST_USECOND), (gint) bitrate);
/* Take old rate into account too */
if (demux->current_download_rate != -1)
bitrate = (demux->current_download_rate + bitrate * 3) / 4;
if (bitrate > G_MAXINT)
bitrate = G_MAXINT;
demux->current_download_rate = bitrate;
GST_DEBUG_OBJECT (demux, "Using current download rate: %d", (gint) bitrate);
GST_M3U8_CLIENT_LOCK (demux->client);
if (!demux->client->main->lists) {
GST_M3U8_CLIENT_UNLOCK (demux->client);
return TRUE;
}
GST_M3U8_CLIENT_UNLOCK (demux->client);
return gst_hls_demux_change_playlist (demux, bitrate * demux->bitrate_limit);
}
#if defined(HAVE_OPENSSL)
static gboolean
gst_hls_demux_decrypt_start (GstHLSDemux * demux, const guint8 * key_data,
const guint8 * iv_data)
{
EVP_CIPHER_CTX_init (&demux->aes_ctx);
if (!EVP_DecryptInit_ex (&demux->aes_ctx, EVP_aes_128_cbc (), NULL, key_data,
iv_data))
return FALSE;
EVP_CIPHER_CTX_set_padding (&demux->aes_ctx, 0);
return TRUE;
}
static gboolean
decrypt_fragment (GstHLSDemux * demux, gsize length,
const guint8 * encrypted_data, guint8 * decrypted_data)
{
int len, flen = 0;
if (G_UNLIKELY (length > G_MAXINT || length % 16 != 0))
return FALSE;
len = (int) length;
if (!EVP_DecryptUpdate (&demux->aes_ctx, decrypted_data, &len, encrypted_data,
len))
return FALSE;
EVP_DecryptFinal_ex (&demux->aes_ctx, decrypted_data + len, &flen);
g_return_val_if_fail (len + flen == length, FALSE);
return TRUE;
}
static void
gst_hls_demux_decrypt_end (GstHLSDemux * demux)
{
EVP_CIPHER_CTX_cleanup (&demux->aes_ctx);
}
#elif defined(HAVE_NETTLE)
static gboolean
gst_hls_demux_decrypt_start (GstHLSDemux * demux, const guint8 * key_data,
const guint8 * iv_data)
{
aes_set_decrypt_key (&demux->aes_ctx.ctx, 16, key_data);
CBC_SET_IV (&demux->aes_ctx, iv_data);
return TRUE;
}
static gboolean
decrypt_fragment (GstHLSDemux * demux, gsize length,
const guint8 * encrypted_data, guint8 * decrypted_data)
{
if (length % 16 != 0)
return FALSE;
CBC_DECRYPT (&demux->aes_ctx, aes_decrypt, length, decrypted_data,
encrypted_data);
return TRUE;
}
static void
gst_hls_demux_decrypt_end (GstHLSDemux * demux)
{
/* NOP */
}
#else
static gboolean
gst_hls_demux_decrypt_start (GstHLSDemux * demux, const guint8 * key_data,
const guint8 * iv_data)
{
gcry_error_t err = 0;
gboolean ret = FALSE;
err =
gcry_cipher_open (&demux->aes_ctx, GCRY_CIPHER_AES128,
GCRY_CIPHER_MODE_CBC, 0);
if (err)
goto out;
err = gcry_cipher_setkey (demux->aes_ctx, key_data, 16);
if (err)
goto out;
err = gcry_cipher_setiv (demux->aes_ctx, iv_data, 16);
if (!err)
ret = TRUE;
out:
if (!ret)
if (demux->aes_ctx)
gcry_cipher_close (demux->aes_ctx);
return ret;
}
static gboolean
decrypt_fragment (GstHLSDemux * demux, gsize length,
const guint8 * encrypted_data, guint8 * decrypted_data)
{
gcry_error_t err = 0;
err = gcry_cipher_decrypt (demux->aes_ctx, decrypted_data, length,
encrypted_data, length);
return err == 0;
}
static void
gst_hls_demux_decrypt_end (GstHLSDemux * demux)
{
if (demux->aes_ctx) {
gcry_cipher_close (demux->aes_ctx);
demux->aes_ctx = NULL;
}
}
#endif
static GstBuffer *
gst_hls_demux_decrypt_fragment (GstHLSDemux * demux,
GstBuffer * encrypted_buffer, GError ** err)
{
GstBuffer *decrypted_buffer = NULL;
GstMapInfo encrypted_info, decrypted_info;
decrypted_buffer =
gst_buffer_new_allocate (NULL, gst_buffer_get_size (encrypted_buffer),
NULL);
gst_buffer_map (encrypted_buffer, &encrypted_info, GST_MAP_READ);
gst_buffer_map (decrypted_buffer, &decrypted_info, GST_MAP_WRITE);
if (!decrypt_fragment (demux, encrypted_info.size,
encrypted_info.data, decrypted_info.data))
goto decrypt_error;
gst_buffer_unmap (decrypted_buffer, &decrypted_info);
gst_buffer_unmap (encrypted_buffer, &encrypted_info);
gst_buffer_unref (encrypted_buffer);
return decrypted_buffer;
decrypt_error:
GST_ERROR_OBJECT (demux, "Failed to decrypt fragment");
g_set_error (err, GST_STREAM_ERROR, GST_STREAM_ERROR_DECRYPT,
"Failed to decrypt fragment");
gst_buffer_unmap (decrypted_buffer, &decrypted_info);
gst_buffer_unmap (encrypted_buffer, &encrypted_info);
gst_buffer_unref (encrypted_buffer);
gst_buffer_unref (decrypted_buffer);
return NULL;
}
static gboolean
gst_hls_demux_update_source (GstHLSDemux * demux, const gchar * uri,
const gchar * referer, gboolean refresh, gboolean allow_cache)
{
if (!gst_uri_is_valid (uri))
return FALSE;
if (demux->src != NULL) {
gchar *old_protocol, *new_protocol;
gchar *old_uri;
old_uri = gst_uri_handler_get_uri (GST_URI_HANDLER (demux->src));
old_protocol = gst_uri_get_protocol (old_uri);
new_protocol = gst_uri_get_protocol (uri);
if (!g_str_equal (old_protocol, new_protocol)) {
gst_object_unref (demux->src_srcpad);
gst_element_set_state (demux->src, GST_STATE_NULL);
gst_bin_remove (GST_BIN_CAST (demux), demux->src);
demux->src = NULL;
demux->src_srcpad = NULL;
GST_DEBUG_OBJECT (demux, "Can't re-use old source element");
} else {
GError *err = NULL;
GST_DEBUG_OBJECT (demux, "Re-using old source element");
if (!gst_uri_handler_set_uri (GST_URI_HANDLER (demux->src), uri, &err)) {
GST_DEBUG_OBJECT (demux, "Failed to re-use old source element: %s",
err->message);
g_clear_error (&err);
gst_element_set_state (demux->src, GST_STATE_NULL);
gst_bin_remove (GST_BIN_CAST (demux), demux->src);
demux->src = NULL;
}
}
g_free (old_uri);
g_free (old_protocol);
g_free (new_protocol);
}
if (demux->src == NULL) {
GObjectClass *gobject_class;
demux->src = gst_element_make_from_uri (GST_URI_SRC, uri, NULL, NULL);
if (demux->src == NULL) {
GST_WARNING_OBJECT (demux, "No element to handle uri: %s", uri);
return FALSE;
}
gobject_class = G_OBJECT_GET_CLASS (demux->src);
if (g_object_class_find_property (gobject_class, "compress"))
g_object_set (demux->src, "compress", FALSE, NULL);
if (g_object_class_find_property (gobject_class, "keep-alive"))
g_object_set (demux->src, "keep-alive", TRUE, NULL);
if (g_object_class_find_property (gobject_class, "extra-headers")) {
if (referer || refresh || !allow_cache) {
GstStructure *extra_headers = gst_structure_new_empty ("headers");
if (referer)
gst_structure_set (extra_headers, "Referer", G_TYPE_STRING, referer,
NULL);
if (!allow_cache)
gst_structure_set (extra_headers, "Cache-Control", G_TYPE_STRING,
"no-cache", NULL);
else if (refresh)
gst_structure_set (extra_headers, "Cache-Control", G_TYPE_STRING,
"max-age=0", NULL);
g_object_set (demux->src, "extra-headers", extra_headers, NULL);
gst_structure_free (extra_headers);
} else {
g_object_set (demux->src, "extra-headers", NULL, NULL);
}
}
gst_element_set_locked_state (demux->src, TRUE);
gst_bin_add (GST_BIN_CAST (demux), demux->src);
demux->src_srcpad = gst_element_get_static_pad (demux->src, "src");
}
return TRUE;
}
static gboolean
gst_hls_demux_get_next_fragment (GstHLSDemux * demux,
gboolean * end_of_playlist, GError ** err)
{
const gchar *next_fragment_uri;
GstClockTime duration;
GstClockTime timestamp;
gboolean discont;
gint64 range_start, range_end;
const gchar *key = NULL;
const guint8 *iv = NULL;
GstClockTime download_start_time = 0;
*end_of_playlist = FALSE;
if (!gst_m3u8_client_get_next_fragment (demux->client, &discont,
&next_fragment_uri, &duration, &timestamp, &range_start, &range_end,
&key, &iv, demux->segment.rate > 0)) {
GST_INFO_OBJECT (demux, "This playlist doesn't contain more fragments");
*end_of_playlist = TRUE;
return FALSE;
}
g_mutex_lock (&demux->fragment_download_lock);
GST_DEBUG_OBJECT (demux,
"Fetching next fragment %s %" GST_TIME_FORMAT "(range=%" G_GINT64_FORMAT
"-%" G_GINT64_FORMAT ")", next_fragment_uri, GST_TIME_ARGS (timestamp),
range_start, range_end);
/* set up our source for download */
demux->current_timestamp = timestamp;
demux->current_duration = duration;
demux->starting_fragment = TRUE;
demux->reset_crypto = TRUE;
demux->current_key = key;
demux->current_iv = iv;
/* Reset last flow return */
demux->last_ret = GST_FLOW_OK;
g_clear_error (&demux->last_error);
if (!gst_hls_demux_update_source (demux, next_fragment_uri,
demux->client->main ? demux->client->main->uri : NULL,
FALSE,
demux->client->current ? demux->client->current->allowcache : TRUE)) {
*err =
g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_MISSING_PLUGIN,
"Missing plugin to handle URI: '%s'", next_fragment_uri);
g_mutex_unlock (&demux->fragment_download_lock);
return FALSE;
}
gst_hls_demux_configure_src_pad (demux);
if (gst_element_set_state (demux->src,
GST_STATE_READY) != GST_STATE_CHANGE_FAILURE) {
if (range_start != 0 || range_end != -1) {
if (!gst_element_send_event (demux->src, gst_event_new_seek (1.0,
GST_FORMAT_BYTES, (GstSeekFlags) GST_SEEK_FLAG_FLUSH,
GST_SEEK_TYPE_SET, range_start, GST_SEEK_TYPE_SET,
range_end))) {
/* looks like the source can't handle seeks in READY */
*err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_NOT_IMPLEMENTED,
"Source element can't handle range requests");
demux->last_ret = GST_FLOW_ERROR;
}
}
if (G_LIKELY (demux->last_ret == GST_FLOW_OK)) {
demux->download_start_time = g_get_monotonic_time ();
download_start_time = gst_util_get_timestamp ();
gst_element_sync_state_with_parent (demux->src);
/* wait for the fragment to be completely downloaded */
GST_DEBUG_OBJECT (demux, "Waiting for fragment download to finish: %s",
next_fragment_uri);
g_cond_wait (&demux->fragment_download_cond,
&demux->fragment_download_lock);
}
} else {
demux->last_ret = GST_FLOW_CUSTOM_ERROR;
}
g_mutex_unlock (&demux->fragment_download_lock);
/* flush the proxypads so that the EOS state is reset */
gst_pad_push_event (demux->src_srcpad, gst_event_new_flush_start ());
gst_pad_push_event (demux->src_srcpad, gst_event_new_flush_stop (TRUE));
if (demux->last_ret != GST_FLOW_OK) {
gst_element_set_state (demux->src, GST_STATE_NULL);
if (*err == NULL) {
if (demux->last_error) {
*err = demux->last_error;
demux->last_error = NULL;
} else {
*err = g_error_new (GST_RESOURCE_ERROR, GST_RESOURCE_ERROR_FAILED,
"Failed to download fragment");
}
}
} else {
gst_element_set_state (demux->src, GST_STATE_READY);
if (demux->segment.rate > 0)
demux->segment.position += demux->current_duration;
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_element (GST_OBJECT_CAST (demux),
gst_structure_new (STATISTICS_MESSAGE_NAME,
"manifest-uri", G_TYPE_STRING,
gst_m3u8_client_get_uri (demux->client), "uri", G_TYPE_STRING,
next_fragment_uri, "fragment-start-time",
GST_TYPE_CLOCK_TIME, download_start_time,
"fragment-stop-time", GST_TYPE_CLOCK_TIME,
gst_util_get_timestamp (), "fragment-size", G_TYPE_UINT64,
demux->download_total_bytes, "fragment-download-time",
GST_TYPE_CLOCK_TIME, demux->download_total_time * GST_USECOND,
NULL)));
}
if (demux->last_ret != GST_FLOW_OK)
return FALSE;
return TRUE;
}
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