gstreamer/ext/smoothstreaming/gstmssdemux.c
2014-05-05 09:41:51 +02:00

1319 lines
39 KiB
C

/* GStreamer
* Copyright (C) 2012 Smart TV Alliance
* Author: Thiago Sousa Santos <thiago.sousa.santos@collabora.com>, Collabora Ltd.
*
* gstmssdemux.c:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-mssdemux
*
* Demuxes a Microsoft's Smooth Streaming manifest into its audio and/or video streams.
*
*
*/
/*
* == Internals
*
* = Smooth streaming in a few lines
* A SS stream is defined by a xml manifest file. This file has a list of
* tracks (StreamIndex), each one can have multiple QualityLevels, that define
* different encoding/bitrates. When playing a track, only one of those
* QualityLevels can be active at a time (per stream).
*
* The StreamIndex defines a URL with {time} and {bitrate} tags that are
* replaced by values indicated by the fragment start times and the selected
* QualityLevel, that generates the fragments URLs.
*
* Another relevant detail is that the Isomedia fragments for smoothstreaming
* won't contains a 'moov' atom, nor a 'stsd', so there is no information
* about the media type/configuration on the fragments, it must be extracted
* from the Manifest and passed downstream. mssdemux does this via GstCaps.
*
* = How mssdemux works
* There is a gstmssmanifest.c utility that holds the manifest and parses
* and has functions to extract information from it. mssdemux received the
* manifest from its sink pad and starts processing it when it gets EOS.
*
* The Manifest is parsed and the streams are exposed, 1 pad for each, with
* a initially selected QualityLevel. Each stream starts its own GstTaks that
* is responsible for downloading fragments and pushing them downstream.
*
* When a new connection-speed is set, mssdemux evaluates the available
* QualityLevels and might decide to switch to another one. In this case it
* pushes a new GstCaps event indicating the new caps on the pads.
*
* All operations that intend to update the GstTasks state should be protected
* with the GST_OBJECT_LOCK.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gst/gst-i18n-plugin.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "gstmssdemux.h"
GST_DEBUG_CATEGORY (mssdemux_debug);
#define DEFAULT_CONNECTION_SPEED 0
#define DEFAULT_MAX_QUEUE_SIZE_BUFFERS 0
#define DEFAULT_BITRATE_LIMIT 0.8
#define DOWNLOAD_RATE_MAX_HISTORY_LENGTH 5
#define MAX_DOWNLOAD_ERROR_COUNT 3
enum
{
PROP_0,
PROP_CONNECTION_SPEED,
PROP_MAX_QUEUE_SIZE_BUFFERS,
PROP_BITRATE_LIMIT,
PROP_LAST
};
static GstStaticPadTemplate gst_mss_demux_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/vnd.ms-sstr+xml")
);
static GstStaticPadTemplate gst_mss_demux_videosrc_template =
GST_STATIC_PAD_TEMPLATE ("video_%02u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_mss_demux_audiosrc_template =
GST_STATIC_PAD_TEMPLATE ("audio_%02u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
#define gst_mss_demux_parent_class parent_class
G_DEFINE_TYPE (GstMssDemux, gst_mss_demux, GST_TYPE_ELEMENT);
static void gst_mss_demux_dispose (GObject * object);
static void gst_mss_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_mss_demux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstStateChangeReturn gst_mss_demux_change_state (GstElement * element,
GstStateChange transition);
static GstFlowReturn gst_mss_demux_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static GstFlowReturn gst_mss_demux_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_mss_demux_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static void gst_mss_demux_download_loop (GstMssDemuxStream * stream);
static GstFlowReturn gst_mss_demux_stream_push (GstMssDemuxStream * stream,
GstBuffer * buffer);
static GstFlowReturn gst_mss_demux_stream_push_event (GstMssDemuxStream *
stream, GstEvent * event);
static GstFlowReturn gst_mss_demux_combine_flows (GstMssDemux * mssdemux);
static gboolean gst_mss_demux_process_manifest (GstMssDemux * mssdemux);
static void
gst_mss_demux_stop_tasks (GstMssDemux * mssdemux, gboolean immediate);
static void
gst_mss_demux_class_init (GstMssDemuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_mss_demux_sink_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_mss_demux_videosrc_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_mss_demux_audiosrc_template));
gst_element_class_set_static_metadata (gstelement_class,
"Smooth Streaming demuxer", "Codec/Demuxer/Adaptive",
"Parse and demultiplex a Smooth Streaming manifest into audio and video "
"streams", "Thiago Santos <thiago.sousa.santos@collabora.com>");
gobject_class->dispose = gst_mss_demux_dispose;
gobject_class->set_property = gst_mss_demux_set_property;
gobject_class->get_property = gst_mss_demux_get_property;
g_object_class_install_property (gobject_class, PROP_CONNECTION_SPEED,
g_param_spec_uint ("connection-speed", "Connection Speed",
"Network connection speed in kbps (0 = unknown)",
0, G_MAXUINT / 1000, DEFAULT_CONNECTION_SPEED,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_QUEUE_SIZE_BUFFERS,
g_param_spec_uint ("max-queue-size-buffers", "Max queue size in buffers",
"Maximum buffers that can be stored in each internal stream queue "
"(0 = infinite)", 0, G_MAXUINT, DEFAULT_MAX_QUEUE_SIZE_BUFFERS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_BITRATE_LIMIT,
g_param_spec_float ("bitrate-limit",
"Bitrate limit in %",
"Limit of the available bitrate to use when switching to alternates.",
0, 1, DEFAULT_BITRATE_LIMIT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_mss_demux_change_state);
GST_DEBUG_CATEGORY_INIT (mssdemux_debug, "mssdemux", 0, "mssdemux plugin");
}
static void
gst_mss_demux_init (GstMssDemux * mssdemux)
{
mssdemux->sinkpad =
gst_pad_new_from_static_template (&gst_mss_demux_sink_template, "sink");
gst_pad_set_chain_function (mssdemux->sinkpad,
GST_DEBUG_FUNCPTR (gst_mss_demux_chain));
gst_pad_set_event_function (mssdemux->sinkpad,
GST_DEBUG_FUNCPTR (gst_mss_demux_event));
gst_element_add_pad (GST_ELEMENT_CAST (mssdemux), mssdemux->sinkpad);
mssdemux->data_queue_max_size = DEFAULT_MAX_QUEUE_SIZE_BUFFERS;
mssdemux->bitrate_limit = DEFAULT_BITRATE_LIMIT;
mssdemux->have_group_id = FALSE;
mssdemux->group_id = G_MAXUINT;
}
static GstMssDemuxStream *
gst_mss_demux_stream_new (GstMssDemux * mssdemux,
GstMssStream * manifeststream, GstPad * srcpad)
{
GstMssDemuxStream *stream;
stream = g_new0 (GstMssDemuxStream, 1);
stream->downloader = gst_uri_downloader_new ();
/* Downloading task */
g_rec_mutex_init (&stream->download_lock);
stream->download_task =
gst_task_new ((GstTaskFunction) gst_mss_demux_download_loop, stream,
NULL);
gst_task_set_lock (stream->download_task, &stream->download_lock);
stream->pad = srcpad;
stream->manifest_stream = manifeststream;
stream->parent = mssdemux;
gst_download_rate_init (&stream->download_rate);
gst_download_rate_set_max_length (&stream->download_rate,
DOWNLOAD_RATE_MAX_HISTORY_LENGTH);
gst_segment_init (&stream->segment, GST_FORMAT_TIME);
return stream;
}
static void
gst_mss_demux_stream_free (GstMssDemuxStream * stream)
{
if (stream->download_task) {
if (GST_TASK_STATE (stream->download_task) != GST_TASK_STOPPED) {
GST_DEBUG_OBJECT (stream->parent, "Leaving streaming task %s:%s",
GST_DEBUG_PAD_NAME (stream->pad));
gst_uri_downloader_cancel (stream->downloader);
gst_task_stop (stream->download_task);
GST_LOG_OBJECT (stream->parent, "Waiting for task to finish");
gst_task_join (stream->download_task);
GST_LOG_OBJECT (stream->parent, "Finished");
}
gst_object_unref (stream->download_task);
g_rec_mutex_clear (&stream->download_lock);
stream->download_task = NULL;
}
gst_download_rate_deinit (&stream->download_rate);
if (stream->pending_newsegment) {
gst_event_unref (stream->pending_newsegment);
stream->pending_newsegment = NULL;
}
if (stream->downloader != NULL) {
g_object_unref (stream->downloader);
stream->downloader = NULL;
}
if (stream->pad) {
gst_object_unref (stream->pad);
stream->pad = NULL;
}
if (stream->caps)
gst_caps_unref (stream->caps);
g_free (stream);
}
static void
gst_mss_demux_reset (GstMssDemux * mssdemux)
{
GSList *iter;
gst_mss_demux_stop_tasks (mssdemux, TRUE);
if (mssdemux->manifest_buffer) {
gst_buffer_unref (mssdemux->manifest_buffer);
mssdemux->manifest_buffer = NULL;
}
for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) {
GstMssDemuxStream *stream = iter->data;
if (stream->pad)
gst_element_remove_pad (GST_ELEMENT_CAST (mssdemux), stream->pad);
gst_mss_demux_stream_free (stream);
}
g_slist_free (mssdemux->streams);
mssdemux->streams = NULL;
if (mssdemux->manifest) {
gst_mss_manifest_free (mssdemux->manifest);
mssdemux->manifest = NULL;
}
mssdemux->n_videos = mssdemux->n_audios = 0;
g_free (mssdemux->base_url);
mssdemux->base_url = NULL;
g_free (mssdemux->manifest_uri);
mssdemux->manifest_uri = NULL;
mssdemux->have_group_id = FALSE;
mssdemux->group_id = G_MAXUINT;
}
static void
gst_mss_demux_dispose (GObject * object)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (object);
gst_mss_demux_reset (mssdemux);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_mss_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX (object);
switch (prop_id) {
case PROP_CONNECTION_SPEED:
GST_OBJECT_LOCK (mssdemux);
mssdemux->connection_speed = g_value_get_uint (value) * 1000;
mssdemux->update_bitrates = TRUE;
GST_DEBUG_OBJECT (mssdemux, "Connection speed set to %" G_GUINT64_FORMAT,
mssdemux->connection_speed);
GST_OBJECT_UNLOCK (mssdemux);
break;
case PROP_MAX_QUEUE_SIZE_BUFFERS:
mssdemux->data_queue_max_size = g_value_get_uint (value);
break;
case PROP_BITRATE_LIMIT:
mssdemux->bitrate_limit = g_value_get_float (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_mss_demux_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX (object);
switch (prop_id) {
case PROP_CONNECTION_SPEED:
g_value_set_uint (value, mssdemux->connection_speed / 1000);
break;
case PROP_MAX_QUEUE_SIZE_BUFFERS:
g_value_set_uint (value, mssdemux->data_queue_max_size);
break;
case PROP_BITRATE_LIMIT:
g_value_set_float (value, mssdemux->bitrate_limit);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_mss_demux_change_state (GstElement * element, GstStateChange transition)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (element);
GstStateChangeReturn result = GST_STATE_CHANGE_FAILURE;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_mss_demux_reset (mssdemux);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
return result;
}
static GstFlowReturn
gst_mss_demux_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (parent);
if (mssdemux->manifest_buffer == NULL)
mssdemux->manifest_buffer = buffer;
else
mssdemux->manifest_buffer =
gst_buffer_append (mssdemux->manifest_buffer, buffer);
GST_INFO_OBJECT (mssdemux, "Received manifest buffer, total size is %i bytes",
(gint) gst_buffer_get_size (mssdemux->manifest_buffer));
return GST_FLOW_OK;
}
static void
gst_mss_demux_start (GstMssDemux * mssdemux)
{
GSList *iter;
GST_INFO_OBJECT (mssdemux, "Starting streams' tasks");
for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) {
GstMssDemuxStream *stream = iter->data;
gst_task_start (stream->download_task);
}
}
static gboolean
gst_mss_demux_push_src_event (GstMssDemux * mssdemux, GstEvent * event)
{
GSList *iter;
gboolean ret = TRUE;
for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) {
GstMssDemuxStream *stream = iter->data;
gst_event_ref (event);
ret = ret & gst_pad_push_event (stream->pad, event);
}
gst_event_unref (event);
return ret;
}
static gboolean
gst_mss_demux_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (parent);
gboolean forward = TRUE;
gboolean ret = TRUE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
gst_mss_demux_reset (mssdemux);
break;
case GST_EVENT_EOS:
if (mssdemux->manifest_buffer == NULL) {
GST_WARNING_OBJECT (mssdemux, "Received EOS without a manifest.");
break;
}
GST_INFO_OBJECT (mssdemux, "Received EOS");
if (gst_mss_demux_process_manifest (mssdemux))
gst_mss_demux_start (mssdemux);
forward = FALSE;
break;
default:
break;
}
if (forward) {
ret = gst_pad_event_default (pad, parent, event);
} else {
gst_event_unref (event);
}
return ret;
}
static void
gst_mss_demux_stop_tasks (GstMssDemux * mssdemux, gboolean immediate)
{
GSList *iter;
GST_OBJECT_LOCK (mssdemux);
for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) {
GstMssDemuxStream *stream = iter->data;
gst_task_stop (stream->download_task);
stream->cancelled = TRUE;
if (immediate)
gst_uri_downloader_cancel (stream->downloader);
}
GST_OBJECT_UNLOCK (mssdemux);
for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) {
GstMssDemuxStream *stream = iter->data;
gst_task_join (stream->download_task);
stream->download_error_count = 0;
}
}
static void
gst_mss_demux_restart_tasks (GstMssDemux * mssdemux)
{
GSList *iter;
for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) {
GstMssDemuxStream *stream = iter->data;
gst_uri_downloader_reset (stream->downloader);
stream->cancelled = FALSE;
gst_task_start (stream->download_task);
}
}
static gboolean
gst_mss_demux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstMssDemux *mssdemux;
mssdemux = GST_MSS_DEMUX_CAST (parent);
switch (event->type) {
case GST_EVENT_SEEK:
{
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
GstEvent *newsegment;
GSList *iter;
gboolean update;
GST_INFO_OBJECT (mssdemux, "Received GST_EVENT_SEEK");
gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
if (format != GST_FORMAT_TIME)
goto not_supported;
GST_DEBUG_OBJECT (mssdemux,
"seek event, rate: %f start: %" GST_TIME_FORMAT " stop: %"
GST_TIME_FORMAT, rate, GST_TIME_ARGS (start), GST_TIME_ARGS (stop));
if (flags & GST_SEEK_FLAG_FLUSH) {
GstEvent *flush = gst_event_new_flush_start ();
GST_DEBUG_OBJECT (mssdemux, "sending flush start");
gst_event_set_seqnum (flush, gst_event_get_seqnum (event));
gst_mss_demux_push_src_event (mssdemux, flush);
}
gst_mss_demux_stop_tasks (mssdemux, TRUE);
if (!gst_mss_manifest_seek (mssdemux->manifest, start)) {;
GST_WARNING_OBJECT (mssdemux, "Could not find seeked fragment");
goto not_supported;
}
for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) {
GstMssDemuxStream *stream = iter->data;
stream->eos = FALSE;
if (flags & GST_SEEK_FLAG_FLUSH) {
stream->last_ret = GST_FLOW_OK;
}
gst_segment_do_seek (&stream->segment, rate, format, flags,
start_type, start, stop_type, stop, &update);
newsegment = gst_event_new_segment (&stream->segment);
gst_event_set_seqnum (newsegment, gst_event_get_seqnum (event));
if (stream->pending_newsegment)
gst_event_unref (stream->pending_newsegment);
stream->pending_newsegment = newsegment;
}
if (flags & GST_SEEK_FLAG_FLUSH) {
GstEvent *flush = gst_event_new_flush_stop (TRUE);
GST_DEBUG_OBJECT (mssdemux, "sending flush stop");
gst_event_set_seqnum (flush, gst_event_get_seqnum (event));
gst_mss_demux_push_src_event (mssdemux, flush);
}
gst_mss_demux_restart_tasks (mssdemux);
gst_event_unref (event);
return TRUE;
}
case GST_EVENT_RECONFIGURE:{
GSList *iter;
for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) {
GstMssDemuxStream *stream = iter->data;
if (stream->pad == pad) {
GST_OBJECT_LOCK (mssdemux);
if (stream->last_ret == GST_FLOW_NOT_LINKED) {
GST_DEBUG_OBJECT (stream->pad, "Received reconfigure");
stream->restart_download = TRUE;
gst_task_start (stream->download_task);
}
GST_OBJECT_UNLOCK (mssdemux);
gst_event_unref (event);
return TRUE;
}
}
}
break;
default:
break;
}
return gst_pad_event_default (pad, parent, event);
not_supported:
gst_event_unref (event);
return FALSE;
}
static gboolean
gst_mss_demux_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstMssDemux *mssdemux;
gboolean ret = FALSE;
if (query == NULL)
return FALSE;
mssdemux = GST_MSS_DEMUX (parent);
switch (query->type) {
case GST_QUERY_DURATION:{
GstClockTime duration = -1;
GstFormat fmt;
gst_query_parse_duration (query, &fmt, NULL);
if (fmt == GST_FORMAT_TIME && mssdemux->manifest) {
/* TODO should we use the streams accumulated duration or the main manifest duration? */
duration = gst_mss_manifest_get_gst_duration (mssdemux->manifest);
if (GST_CLOCK_TIME_IS_VALID (duration) && duration > 0) {
gst_query_set_duration (query, GST_FORMAT_TIME, duration);
ret = TRUE;
}
}
GST_INFO_OBJECT (mssdemux, "GST_QUERY_DURATION returns %s with duration %"
GST_TIME_FORMAT, ret ? "TRUE" : "FALSE", GST_TIME_ARGS (duration));
break;
}
case GST_QUERY_LATENCY:{
gboolean live = FALSE;
live = mssdemux->manifest
&& gst_mss_manifest_is_live (mssdemux->manifest);
gst_query_set_latency (query, live, 0, -1);
ret = TRUE;
break;
}
case GST_QUERY_SEEKING:{
GstFormat fmt;
gint64 stop = -1;
if (!mssdemux->manifest) {
return FALSE; /* no seeking without manifest */
} else if (gst_mss_manifest_is_live (mssdemux->manifest)) {
return FALSE; /* no live seeking */
}
gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
GST_INFO_OBJECT (mssdemux, "Received GST_QUERY_SEEKING with format %d",
fmt);
if (fmt == GST_FORMAT_TIME) {
GstClockTime duration;
duration = gst_mss_manifest_get_gst_duration (mssdemux->manifest);
if (GST_CLOCK_TIME_IS_VALID (duration) && duration > 0)
stop = duration;
gst_query_set_seeking (query, fmt, TRUE, 0, stop);
ret = TRUE;
GST_INFO_OBJECT (mssdemux, "GST_QUERY_SEEKING returning with stop : %"
GST_TIME_FORMAT, GST_TIME_ARGS (stop));
}
break;
}
default:
/* Don't fordward queries upstream because of the special nature of this
* "demuxer", which relies on the upstream element only to be fed
* the Manifest
*/
break;
}
return ret;
}
static void
_set_src_pad_functions (GstPad * pad)
{
gst_pad_set_query_function (pad, GST_DEBUG_FUNCPTR (gst_mss_demux_src_query));
gst_pad_set_event_function (pad, GST_DEBUG_FUNCPTR (gst_mss_demux_src_event));
}
static GstPad *
_create_pad (GstMssDemux * mssdemux, GstMssStream * manifeststream)
{
gchar *name;
GstPad *srcpad = NULL;
GstMssStreamType streamtype;
streamtype = gst_mss_stream_get_type (manifeststream);
GST_DEBUG_OBJECT (mssdemux, "Found stream of type: %s",
gst_mss_stream_type_name (streamtype));
/* TODO use stream's name/bitrate/index as the pad name? */
if (streamtype == MSS_STREAM_TYPE_VIDEO) {
name = g_strdup_printf ("video_%02u", mssdemux->n_videos++);
srcpad =
gst_pad_new_from_static_template (&gst_mss_demux_videosrc_template,
name);
g_free (name);
} else if (streamtype == MSS_STREAM_TYPE_AUDIO) {
name = g_strdup_printf ("audio_%02u", mssdemux->n_audios++);
srcpad =
gst_pad_new_from_static_template (&gst_mss_demux_audiosrc_template,
name);
g_free (name);
}
if (!srcpad) {
GST_WARNING_OBJECT (mssdemux, "Ignoring unknown type stream");
return NULL;
}
_set_src_pad_functions (srcpad);
return srcpad;
}
static void
gst_mss_demux_create_streams (GstMssDemux * mssdemux)
{
GSList *streams = gst_mss_manifest_get_streams (mssdemux->manifest);
GSList *iter;
if (streams == NULL) {
GST_INFO_OBJECT (mssdemux, "No streams found in the manifest");
GST_ELEMENT_ERROR (mssdemux, STREAM, DEMUX,
(_("This file contains no playable streams.")),
("no streams found at the Manifest"));
return;
}
for (iter = streams; iter; iter = g_slist_next (iter)) {
GstPad *srcpad = NULL;
GstMssDemuxStream *stream = NULL;
GstMssStream *manifeststream = iter->data;
srcpad = _create_pad (mssdemux, manifeststream);
if (!srcpad) {
continue;
}
stream = gst_mss_demux_stream_new (mssdemux, manifeststream, srcpad);
gst_mss_stream_set_active (manifeststream, TRUE);
mssdemux->streams = g_slist_append (mssdemux->streams, stream);
}
/* select initial bitrates */
GST_OBJECT_LOCK (mssdemux);
GST_INFO_OBJECT (mssdemux, "Changing max bitrate to %" G_GUINT64_FORMAT,
mssdemux->connection_speed);
gst_mss_manifest_change_bitrate (mssdemux->manifest,
mssdemux->connection_speed);
mssdemux->update_bitrates = FALSE;
GST_OBJECT_UNLOCK (mssdemux);
}
static GstCaps *
create_mss_caps (GstMssDemuxStream * stream, GstCaps * caps)
{
return gst_caps_new_simple ("video/quicktime", "variant", G_TYPE_STRING,
"mss-fragmented", "timescale", G_TYPE_UINT64,
gst_mss_stream_get_timescale (stream->manifest_stream), "media-caps",
GST_TYPE_CAPS, caps, NULL);
}
static gboolean
gst_mss_demux_expose_stream (GstMssDemux * mssdemux, GstMssDemuxStream * stream)
{
GstCaps *caps;
GstCaps *media_caps;
GstPad *pad = stream->pad;
media_caps = gst_mss_stream_get_caps (stream->manifest_stream);
if (media_caps) {
gchar *name = gst_pad_get_name (pad);
const gchar *lang;
GstEvent *event;
gchar *stream_id;
gst_pad_set_active (pad, TRUE);
caps = create_mss_caps (stream, media_caps);
gst_caps_unref (media_caps);
stream_id =
gst_pad_create_stream_id (pad, GST_ELEMENT_CAST (mssdemux), name);
event =
gst_pad_get_sticky_event (mssdemux->sinkpad, GST_EVENT_STREAM_START, 0);
if (event) {
if (gst_event_parse_group_id (event, &mssdemux->group_id))
mssdemux->have_group_id = TRUE;
else
mssdemux->have_group_id = FALSE;
gst_event_unref (event);
} else if (!mssdemux->have_group_id) {
mssdemux->have_group_id = TRUE;
mssdemux->group_id = gst_util_group_id_next ();
}
event = gst_event_new_stream_start (stream_id);
if (mssdemux->have_group_id)
gst_event_set_group_id (event, mssdemux->group_id);
gst_pad_push_event (pad, event);
g_free (stream_id);
g_free (name);
gst_pad_set_caps (pad, caps);
stream->caps = caps;
lang = gst_mss_stream_get_lang (stream->manifest_stream);
if (lang != NULL) {
GstTagList *tags;
tags = gst_tag_list_new (GST_TAG_LANGUAGE_CODE, lang, NULL);
gst_pad_push_event (stream->pad, gst_event_new_tag (tags));
}
gst_pad_push_event (stream->pad, gst_event_new_segment (&stream->segment));
GST_INFO_OBJECT (mssdemux, "Adding srcpad %s:%s with caps %" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (pad), caps);
gst_object_ref (pad);
gst_element_add_pad (GST_ELEMENT_CAST (mssdemux), pad);
} else {
GST_WARNING_OBJECT (mssdemux,
"Couldn't get caps from manifest stream %p %s, not exposing it", stream,
GST_PAD_NAME (stream->pad));
return FALSE;
}
return TRUE;
}
static gboolean
gst_mss_demux_process_manifest (GstMssDemux * mssdemux)
{
GstQuery *query;
gchar *uri = NULL;
gboolean ret;
GSList *iter;
g_return_val_if_fail (mssdemux->manifest_buffer != NULL, FALSE);
g_return_val_if_fail (mssdemux->manifest == NULL, FALSE);
query = gst_query_new_uri ();
ret = gst_pad_peer_query (mssdemux->sinkpad, query);
if (ret) {
gchar *baseurl_end;
gst_query_parse_uri (query, &uri);
GST_INFO_OBJECT (mssdemux, "Upstream is using URI: %s", uri);
mssdemux->manifest_uri = g_strdup (uri);
baseurl_end = g_strrstr (uri, "/Manifest");
if (baseurl_end == NULL) {
/* second try */
baseurl_end = g_strrstr (uri, "/manifest");
}
if (baseurl_end) {
/* set the new end of the string */
baseurl_end[0] = '\0';
} else {
GST_WARNING_OBJECT (mssdemux, "Stream's URI didn't end with /manifest");
}
mssdemux->base_url = uri;
}
gst_query_unref (query);
if (mssdemux->base_url == NULL) {
GST_ELEMENT_ERROR (mssdemux, RESOURCE, NOT_FOUND,
(_("Couldn't get the Manifest's URI")),
("need to get the manifest's URI from upstream elements"));
return FALSE;
}
GST_INFO_OBJECT (mssdemux, "Received manifest: %i bytes",
(gint) gst_buffer_get_size (mssdemux->manifest_buffer));
mssdemux->manifest = gst_mss_manifest_new (mssdemux->manifest_buffer);
if (!mssdemux->manifest) {
GST_ELEMENT_ERROR (mssdemux, STREAM, FORMAT, ("Bad manifest file"),
("Xml manifest file couldn't be parsed"));
return FALSE;
}
GST_INFO_OBJECT (mssdemux, "Live stream: %d",
gst_mss_manifest_is_live (mssdemux->manifest));
gst_mss_demux_create_streams (mssdemux);
for (iter = mssdemux->streams; iter;) {
GSList *current = iter;
GstMssDemuxStream *stream = iter->data;
iter = g_slist_next (iter); /* do it ourselves as we want it done in the beginning of the loop */
if (!gst_mss_demux_expose_stream (mssdemux, stream)) {
gst_mss_demux_stream_free (stream);
mssdemux->streams = g_slist_delete_link (mssdemux->streams, current);
}
}
if (!mssdemux->streams) {
/* no streams */
GST_WARNING_OBJECT (mssdemux, "Couldn't identify the caps for any of the "
"streams found in the manifest");
GST_ELEMENT_ERROR (mssdemux, STREAM, DEMUX,
(_("This file contains no playable streams.")),
("No known stream formats found at the Manifest"));
return FALSE;
}
gst_element_no_more_pads (GST_ELEMENT_CAST (mssdemux));
return TRUE;
}
static void
gst_mss_demux_reload_manifest (GstMssDemux * mssdemux)
{
GstUriDownloader *downloader;
GstFragment *manifest_data;
GstBuffer *manifest_buffer;
downloader = gst_uri_downloader_new ();
manifest_data =
gst_uri_downloader_fetch_uri (downloader, mssdemux->manifest_uri, NULL,
TRUE, TRUE, TRUE, NULL);
manifest_buffer = gst_fragment_get_buffer (manifest_data);
g_object_unref (manifest_data);
gst_mss_manifest_reload_fragments (mssdemux->manifest, manifest_buffer);
gst_buffer_replace (&mssdemux->manifest_buffer, manifest_buffer);
gst_buffer_unref (manifest_buffer);
g_object_unref (downloader);
}
static GstEvent *
gst_mss_demux_reconfigure_stream (GstMssDemuxStream * stream)
{
GstEvent *capsevent = NULL;
GstMssDemux *mssdemux = stream->parent;
guint64 new_bitrate;
new_bitrate =
mssdemux->bitrate_limit *
gst_download_rate_get_current_rate (&stream->download_rate);
if (mssdemux->connection_speed) {
new_bitrate = MIN (mssdemux->connection_speed, new_bitrate);
}
GST_DEBUG_OBJECT (stream->pad,
"Current stream download bitrate %" G_GUINT64_FORMAT, new_bitrate);
if (gst_mss_stream_select_bitrate (stream->manifest_stream, new_bitrate)) {
GstCaps *caps;
caps = gst_mss_stream_get_caps (stream->manifest_stream);
GST_DEBUG_OBJECT (stream->pad,
"Starting streams reconfiguration due to bitrate changes");
if (stream->caps)
gst_caps_unref (stream->caps);
stream->caps = create_mss_caps (stream, caps);
gst_caps_unref (caps);
GST_DEBUG_OBJECT (stream->pad,
"Stream changed bitrate to %" G_GUINT64_FORMAT " caps: %"
GST_PTR_FORMAT,
gst_mss_stream_get_current_bitrate (stream->manifest_stream), caps);
capsevent = gst_event_new_caps (stream->caps);
GST_DEBUG_OBJECT (stream->pad, "Finished streams reconfiguration");
}
return capsevent;
}
static GstFlowReturn
gst_mss_demux_stream_download_fragment (GstMssDemuxStream * stream,
GstBuffer ** _buffer)
{
GstMssDemux *mssdemux = stream->parent;
gchar *path;
gchar *url;
GstFragment *fragment;
GstBuffer *buffer;
GstFlowReturn ret = GST_FLOW_OK;
guint64 before_download, after_download;
/* special case for not-linked streams */
if (stream->last_ret == GST_FLOW_NOT_LINKED) {
GST_DEBUG_OBJECT (stream->pad, "Skipping download for not-linked stream %p",
stream);
return GST_FLOW_NOT_LINKED;
}
before_download = g_get_real_time ();
GST_DEBUG_OBJECT (stream->pad, "Getting url for stream");
ret = gst_mss_stream_get_fragment_url (stream->manifest_stream, &path);
switch (ret) {
case GST_FLOW_OK:
break; /* all is good, let's go */
case GST_FLOW_EOS:
if (gst_mss_manifest_is_live (mssdemux->manifest)) {
gst_mss_demux_reload_manifest (mssdemux);
return GST_FLOW_OK;
}
return GST_FLOW_EOS;
case GST_FLOW_ERROR:
goto error;
default:
break;
}
if (!path) {
goto no_url_error;
}
GST_DEBUG_OBJECT (mssdemux, "Got url path '%s' for stream %p", path, stream);
url = g_strdup_printf ("%s/%s", mssdemux->base_url, path);
GST_DEBUG_OBJECT (mssdemux, "Got url '%s' for stream %p", url, stream);
fragment =
gst_uri_downloader_fetch_uri (stream->downloader, url,
mssdemux->manifest_uri, FALSE, FALSE, TRUE, NULL);
g_free (path);
g_free (url);
if (!fragment) {
GST_INFO_OBJECT (mssdemux, "No fragment downloaded");
/* TODO check if we are truly stoping */
if (gst_mss_manifest_is_live (mssdemux->manifest)) {
/* looks like there is no way of knowing when a live stream has ended
* Have to assume we are falling behind and cause a manifest reload */
return GST_FLOW_OK;
}
return GST_FLOW_ERROR;
}
buffer = gst_fragment_get_buffer (fragment);
*_buffer = buffer = gst_buffer_make_writable (buffer);
GST_BUFFER_TIMESTAMP (buffer) =
gst_mss_stream_get_fragment_gst_timestamp (stream->manifest_stream);
GST_BUFFER_DURATION (buffer) =
gst_mss_stream_get_fragment_gst_duration (stream->manifest_stream);
g_object_unref (fragment);
after_download = g_get_real_time ();
{
#ifndef GST_DISABLE_GST_DEBUG
guint64 bitrate = (8 * gst_buffer_get_size (buffer) * 1000000LLU) /
(after_download - before_download);
#endif
GST_DEBUG_OBJECT (mssdemux,
"Measured download bitrate: %s %" G_GUINT64_FORMAT " bps",
GST_PAD_NAME (stream->pad), bitrate);
gst_download_rate_add_rate (&stream->download_rate,
gst_buffer_get_size (buffer),
1000 * (after_download - before_download));
}
return ret;
no_url_error:
{
GST_ELEMENT_ERROR (mssdemux, STREAM, DEMUX,
(_("Failed to get fragment URL.")),
("An error happened when getting fragment URL"));
gst_task_pause (stream->download_task);
return GST_FLOW_ERROR;
}
error:
{
GST_WARNING_OBJECT (mssdemux, "Error while pushing fragment");
gst_task_pause (stream->download_task);
return GST_FLOW_ERROR;
}
}
static void
gst_mss_demux_download_loop (GstMssDemuxStream * stream)
{
GstMssDemux *mssdemux = stream->parent;
GstFlowReturn ret;
GstBuffer *buffer = NULL;
gboolean buffer_downloaded = FALSE;
GstEvent *gap = NULL;
GstEvent *capsevent = NULL;
GST_LOG_OBJECT (stream->pad, "download loop start");
GST_OBJECT_LOCK (mssdemux);
if (G_UNLIKELY (stream->restart_download)) {
GstClockTime cur, ts;
gint64 pos;
GST_DEBUG_OBJECT (stream->pad,
"Activating stream due to reconfigure event");
cur = GST_CLOCK_TIME_IS_VALID (stream->next_timestamp) ?
stream->next_timestamp : 0;
if (gst_pad_peer_query_position (stream->pad, GST_FORMAT_TIME, &pos)) {
ts = (GstClockTime) pos;
GST_DEBUG_OBJECT (mssdemux, "Downstream position: %"
GST_TIME_FORMAT, GST_TIME_ARGS (ts));
} else {
GST_DEBUG_OBJECT (mssdemux, "Downstream position query failed, "
"failling back to segment position");
ts = stream->segment.position;
}
/* we might have already pushed this data */
ts = MAX (ts, stream->next_timestamp);
GST_DEBUG_OBJECT (stream->pad, "Restarting stream at "
"position %" GST_TIME_FORMAT, GST_TIME_ARGS (ts));
if (GST_CLOCK_TIME_IS_VALID (ts)) {
gst_mss_stream_seek (stream->manifest_stream, ts);
if (cur < ts) {
gap = gst_event_new_gap (cur, ts - cur);
}
}
stream->restart_download = FALSE;
stream->last_ret = GST_FLOW_OK;
}
capsevent = gst_mss_demux_reconfigure_stream (stream);
GST_OBJECT_UNLOCK (mssdemux);
if (G_UNLIKELY (gap != NULL))
gst_pad_push_event (stream->pad, gap);
if (G_UNLIKELY (capsevent != NULL))
gst_pad_push_event (stream->pad, capsevent);
ret = gst_mss_demux_stream_download_fragment (stream, &buffer);
buffer_downloaded = buffer != NULL;
GST_OBJECT_LOCK (mssdemux);
if (stream->cancelled) {
if (buffer)
gst_buffer_unref (buffer);
GST_OBJECT_UNLOCK (mssdemux);
goto cancelled;
}
GST_OBJECT_UNLOCK (mssdemux);
if (buffer) {
ret = gst_mss_demux_stream_push (stream, buffer);
}
GST_OBJECT_LOCK (mssdemux);
stream->last_ret = ret;
if (stream->cancelled) {
GST_OBJECT_UNLOCK (mssdemux);
goto cancelled;
}
switch (ret) {
case GST_FLOW_OK:
break; /* all is good, let's go */
case GST_FLOW_EOS:
GST_DEBUG_OBJECT (stream->pad, "EOS, stopping download loop");
/* we push the EOS after releasing the object lock */
gst_task_pause (stream->download_task);
break;
case GST_FLOW_NOT_LINKED:
gst_task_pause (stream->download_task);
if (gst_mss_demux_combine_flows (mssdemux) == GST_FLOW_NOT_LINKED) {
GST_ELEMENT_ERROR (mssdemux, STREAM, FAILED,
(_("Internal data stream error.")),
("stream stopped, reason %s",
gst_flow_get_name (GST_FLOW_NOT_LINKED)));
}
break;
case GST_FLOW_FLUSHING:{
GSList *iter;
for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) {
GstMssDemuxStream *other;
other = iter->data;
gst_task_pause (other->download_task);
}
}
break;
default:
if (ret <= GST_FLOW_ERROR) {
if (buffer_downloaded) {
GST_ERROR_OBJECT (mssdemux, "Error while pushing fragment");
} else {
GST_WARNING_OBJECT (mssdemux, "Error while downloading fragment");
if (++stream->download_error_count >=
DOWNLOAD_RATE_MAX_HISTORY_LENGTH) {
GST_ELEMENT_ERROR (mssdemux, RESOURCE, NOT_FOUND,
(_("Couldn't download fragments")),
("fragment downloading has failed too much consecutive times"));
}
}
}
break;
}
GST_OBJECT_UNLOCK (mssdemux);
if (G_UNLIKELY (ret == GST_FLOW_EOS)) {
gst_mss_demux_stream_push_event (stream, gst_event_new_eos ());
}
if (buffer_downloaded) {
stream->download_error_count = 0;
gst_mss_stream_advance_fragment (stream->manifest_stream);
}
GST_LOG_OBJECT (stream->pad, "download loop end");
return;
cancelled:
{
GST_DEBUG_OBJECT (stream->pad, "Stream has been cancelled");
return;
}
}
static GstFlowReturn
gst_mss_demux_combine_flows (GstMssDemux * mssdemux)
{
gboolean all_notlinked = TRUE;
GSList *iter;
for (iter = mssdemux->streams; iter; iter = g_slist_next (iter)) {
GstMssDemuxStream *stream = iter->data;
if (stream->last_ret != GST_FLOW_NOT_LINKED)
all_notlinked = FALSE;
if (stream->last_ret <= GST_FLOW_NOT_NEGOTIATED
|| stream->last_ret == GST_FLOW_FLUSHING)
return stream->last_ret;
}
if (all_notlinked)
return GST_FLOW_NOT_LINKED;
return GST_FLOW_OK;
}
static gboolean
gst_mss_demux_stream_push (GstMssDemuxStream * stream, GstBuffer * buf)
{
GstFlowReturn ret;
if (G_UNLIKELY (stream->pending_newsegment)) {
gst_pad_push_event (stream->pad, stream->pending_newsegment);
stream->pending_newsegment = NULL;
}
if (GST_BUFFER_TIMESTAMP (buf) != stream->next_timestamp) {
GST_DEBUG_OBJECT (stream->pad, "Marking buffer %p as discont buffer:%"
GST_TIME_FORMAT " != expected:%" GST_TIME_FORMAT, buf,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
GST_TIME_ARGS (stream->next_timestamp));
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
}
GST_DEBUG_OBJECT (stream->pad,
"Pushing buffer %p %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
" discont:%d", buf,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buf)),
GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DISCONT));
stream->next_timestamp =
GST_BUFFER_TIMESTAMP (buf) + GST_BUFFER_DURATION (buf);
stream->have_data = TRUE;
stream->segment.position = GST_BUFFER_TIMESTAMP (buf);
ret = gst_pad_push (stream->pad, GST_BUFFER_CAST (buf));
GST_DEBUG_OBJECT (stream->pad, "Pushed. result: %d (%s)",
ret, gst_flow_get_name (ret));
return ret;
}
static gboolean
gst_mss_demux_stream_push_event (GstMssDemuxStream * stream, GstEvent * event)
{
gboolean ret;
if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) {
stream->eos = TRUE;
}
GST_DEBUG_OBJECT (stream->pad, "Pushing event %" GST_PTR_FORMAT, event);
ret = gst_pad_push_event (stream->pad, event);
return ret;
}