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gstreamer/gst/mpegtsmux/mpegtsmux.c
Sameer Naik 666807ed69 mpegtsmux: fix segfault if gst_collect_pads_pop () returns no buffer 
In mpegtsmux_choose_best_stream () call if the gst_collect_pads_pop () call
returns no buffer (NULL), the plugin SegFaults in the gst_buffer_unref call.
To fix this we check if a valid buffer is returned before calling
gst_buffer_unref ().

Fixes bug #654416.
2011-07-12 07:51:21 +02:00

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/*
* Copyright 2006, 2007, 2008, 2009, 2010 Fluendo S.A.
* Authors: Jan Schmidt <jan@fluendo.com>
* Kapil Agrawal <kapil@fluendo.com>
* Julien Moutte <julien@fluendo.com>
*
* Copyright (C) 2011 Jan Schmidt <thaytan@noraisin.net>
*
* This library is licensed under 4 different licenses and you
* can choose to use it under the terms of any one of them. The
* four licenses are the MPL 1.1, the LGPL, the GPL and the MIT
* license.
*
* MPL:
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
* License for the specific language governing rights and limitations
* under the License.
*
* LGPL:
*
* 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.
*
* GPL:
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* MIT:
*
* Unless otherwise indicated, Source Code is licensed under MIT license.
* See further explanation attached in License Statement (distributed in the file
* LICENSE).
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include "mpegtsmux.h"
#include "mpegtsmux_h264.h"
#include "mpegtsmux_aac.h"
GST_DEBUG_CATEGORY (mpegtsmux_debug);
#define GST_CAT_DEFAULT mpegtsmux_debug
enum
{
ARG_0,
ARG_PROG_MAP,
ARG_M2TS_MODE,
ARG_PAT_INTERVAL,
ARG_PMT_INTERVAL
};
static GstStaticPadTemplate mpegtsmux_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink_%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("video/mpeg, "
"mpegversion = (int) { 1, 2, 4 }, "
"systemstream = (boolean) false; "
"video/x-dirac;"
"video/x-h264,stream-format=(string)byte-stream;"
"audio/mpeg, "
"mpegversion = (int) { 1, 2, 4 };"
"audio/x-lpcm, "
"width = (int) { 16, 20, 24 }, "
"rate = (int) { 48000, 96000 }, "
"channels = (int) [ 1, 8 ], "
"dynamic_range = (int) [ 0, 255 ], "
"emphasis = (boolean) { FALSE, TRUE }, "
"mute = (boolean) { FALSE, TRUE }; " "audio/x-ac3;" "audio/x-dts"));
static GstStaticPadTemplate mpegtsmux_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpegts, "
"systemstream = (boolean) true, " "packetsize = (int) { 188, 192} ")
);
static void gst_mpegtsmux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_mpegtsmux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void mpegtsmux_dispose (GObject * object);
static gboolean new_packet_cb (guint8 * data, guint len, void *user_data,
gint64 new_pcr);
static void release_buffer_cb (guint8 * data, void *user_data);
static void mpegtsdemux_prepare_srcpad (MpegTsMux * mux);
static GstFlowReturn mpegtsmux_collected (GstCollectPads * pads,
MpegTsMux * mux);
static GstPad *mpegtsmux_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name);
static void mpegtsmux_release_pad (GstElement * element, GstPad * pad);
static GstStateChangeReturn mpegtsmux_change_state (GstElement * element,
GstStateChange transition);
static void mpegtsdemux_set_header_on_caps (MpegTsMux * mux);
GST_BOILERPLATE (MpegTsMux, mpegtsmux, GstElement, GST_TYPE_ELEMENT);
static void
mpegtsmux_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&mpegtsmux_sink_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&mpegtsmux_src_factory));
gst_element_class_set_details_simple (element_class,
"MPEG Transport Stream Muxer", "Codec/Muxer",
"Multiplexes media streams into an MPEG Transport Stream",
"Fluendo <contact@fluendo.com>");
}
static void
mpegtsmux_class_init (MpegTsMuxClass * klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_mpegtsmux_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_mpegtsmux_get_property);
gobject_class->dispose = mpegtsmux_dispose;
gstelement_class->request_new_pad = mpegtsmux_request_new_pad;
gstelement_class->release_pad = mpegtsmux_release_pad;
gstelement_class->change_state = mpegtsmux_change_state;
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PROG_MAP,
g_param_spec_boxed ("prog-map", "Program map",
"A GstStructure specifies the mapping from elementary streams to programs",
GST_TYPE_STRUCTURE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_M2TS_MODE,
g_param_spec_boolean ("m2ts-mode", "M2TS(192 bytes) Mode",
"Set to TRUE to output Blu-Ray disc format with 192 byte packets. "
"FALSE for standard TS format with 188 byte packets.", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PAT_INTERVAL,
g_param_spec_uint ("pat-interval", "PAT interval",
"Set the interval (in ticks of the 90kHz clock) for writing out the PAT table",
1, G_MAXUINT, TSMUX_DEFAULT_PAT_INTERVAL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PMT_INTERVAL,
g_param_spec_uint ("pmt-interval", "PMT interval",
"Set the interval (in ticks of the 90kHz clock) for writing out the PMT table",
1, G_MAXUINT, TSMUX_DEFAULT_PMT_INTERVAL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
mpegtsmux_init (MpegTsMux * mux, MpegTsMuxClass * g_class)
{
mux->srcpad =
gst_pad_new_from_static_template (&mpegtsmux_src_factory, "src");
gst_pad_use_fixed_caps (mux->srcpad);
gst_element_add_pad (GST_ELEMENT (mux), mux->srcpad);
mux->collect = gst_collect_pads_new ();
gst_collect_pads_set_function (mux->collect,
(GstCollectPadsFunction) GST_DEBUG_FUNCPTR (mpegtsmux_collected), mux);
mux->tsmux = tsmux_new ();
tsmux_set_write_func (mux->tsmux, new_packet_cb, mux);
mux->programs = g_new0 (TsMuxProgram *, MAX_PROG_NUMBER);
mux->first = TRUE;
mux->last_flow_ret = GST_FLOW_OK;
mux->adapter = gst_adapter_new ();
mux->m2ts_mode = FALSE;
mux->pat_interval = TSMUX_DEFAULT_PAT_INTERVAL;
mux->pmt_interval = TSMUX_DEFAULT_PMT_INTERVAL;
mux->first_pcr = TRUE;
mux->last_ts = 0;
mux->is_delta = TRUE;
mux->prog_map = NULL;
mux->streamheader = NULL;
mux->streamheader_sent = FALSE;
}
static void
mpegtsmux_dispose (GObject * object)
{
MpegTsMux *mux = GST_MPEG_TSMUX (object);
if (mux->adapter) {
gst_adapter_clear (mux->adapter);
g_object_unref (mux->adapter);
mux->adapter = NULL;
}
if (mux->collect) {
gst_object_unref (mux->collect);
mux->collect = NULL;
}
if (mux->tsmux) {
tsmux_free (mux->tsmux);
mux->tsmux = NULL;
}
if (mux->prog_map) {
gst_structure_free (mux->prog_map);
mux->prog_map = NULL;
}
if (mux->programs) {
g_free (mux->programs);
mux->programs = NULL;
}
if (mux->streamheader) {
GstBuffer *buf;
GList *sh;
sh = mux->streamheader;
while (sh) {
buf = sh->data;
gst_buffer_unref (buf);
sh = g_list_next (sh);
}
g_list_free (mux->streamheader);
mux->streamheader = NULL;
}
GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object));
}
static void
gst_mpegtsmux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
MpegTsMux *mux = GST_MPEG_TSMUX (object);
GSList *walk;
switch (prop_id) {
case ARG_M2TS_MODE:
/*set incase if the output stream need to be of 192 bytes */
mux->m2ts_mode = g_value_get_boolean (value);
break;
case ARG_PROG_MAP:
{
const GstStructure *s = gst_value_get_structure (value);
if (mux->prog_map) {
gst_structure_free (mux->prog_map);
}
if (s)
mux->prog_map = gst_structure_copy (s);
else
mux->prog_map = NULL;
break;
}
case ARG_PAT_INTERVAL:
mux->pat_interval = g_value_get_uint (value);
if (mux->tsmux)
tsmux_set_pat_interval (mux->tsmux, mux->pat_interval);
break;
case ARG_PMT_INTERVAL:
walk = mux->collect->data;
mux->pmt_interval = g_value_get_uint (value);
while (walk) {
MpegTsPadData *ts_data = (MpegTsPadData *) walk->data;
tsmux_set_pmt_interval (ts_data->prog, mux->pmt_interval);
walk = g_slist_next (walk);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_mpegtsmux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
MpegTsMux *mux = GST_MPEG_TSMUX (object);
switch (prop_id) {
case ARG_M2TS_MODE:
g_value_set_boolean (value, mux->m2ts_mode);
break;
case ARG_PROG_MAP:
gst_value_set_structure (value, mux->prog_map);
break;
case ARG_PAT_INTERVAL:
g_value_set_uint (value, mux->pat_interval);
break;
case ARG_PMT_INTERVAL:
g_value_set_uint (value, mux->pmt_interval);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
release_buffer_cb (guint8 * data, void *user_data)
{
GstBuffer *buf = (GstBuffer *) user_data;
gst_buffer_unref (buf);
}
static GstFlowReturn
mpegtsmux_create_stream (MpegTsMux * mux, MpegTsPadData * ts_data, GstPad * pad)
{
GstFlowReturn ret = GST_FLOW_ERROR;
GstCaps *caps = gst_pad_get_negotiated_caps (pad);
GstStructure *s;
if (caps == NULL) {
GST_DEBUG_OBJECT (pad, "Sink pad caps were not set before pushing");
return GST_FLOW_NOT_NEGOTIATED;
}
s = gst_caps_get_structure (caps, 0);
g_return_val_if_fail (s != NULL, FALSE);
if (gst_structure_has_name (s, "video/x-dirac")) {
GST_DEBUG_OBJECT (pad, "Creating Dirac stream with PID 0x%04x",
ts_data->pid);
ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_VIDEO_DIRAC,
ts_data->pid);
} else if (gst_structure_has_name (s, "audio/x-ac3")) {
GST_DEBUG_OBJECT (pad, "Creating AC3 stream with PID 0x%04x", ts_data->pid);
ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_PS_AUDIO_AC3,
ts_data->pid);
} else if (gst_structure_has_name (s, "audio/x-dts")) {
GST_DEBUG_OBJECT (pad, "Creating DTS stream with PID 0x%04x", ts_data->pid);
ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_PS_AUDIO_DTS,
ts_data->pid);
} else if (gst_structure_has_name (s, "audio/x-lpcm")) {
GST_DEBUG_OBJECT (pad, "Creating LPCM stream with PID 0x%04x",
ts_data->pid);
ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_PS_AUDIO_LPCM,
ts_data->pid);
} else if (gst_structure_has_name (s, "video/x-h264")) {
const GValue *value;
GST_DEBUG_OBJECT (pad, "Creating H264 stream with PID 0x%04x",
ts_data->pid);
/* Codec data contains SPS/PPS which need to go in stream for valid ES */
value = gst_structure_get_value (s, "codec_data");
if (value) {
ts_data->codec_data = gst_buffer_ref (gst_value_get_buffer (value));
GST_DEBUG_OBJECT (pad, "we have additional codec data (%d bytes)",
GST_BUFFER_SIZE (ts_data->codec_data));
ts_data->prepare_func = mpegtsmux_prepare_h264;
ts_data->free_func = mpegtsmux_free_h264;
} else {
ts_data->codec_data = NULL;
}
ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_VIDEO_H264,
ts_data->pid);
} else if (gst_structure_has_name (s, "audio/mpeg")) {
gint mpegversion;
if (!gst_structure_get_int (s, "mpegversion", &mpegversion)) {
GST_ELEMENT_ERROR (pad, STREAM, FORMAT,
("Invalid data format presented"),
("Caps with type audio/mpeg did not have mpegversion"));
goto beach;
}
switch (mpegversion) {
case 1:
GST_DEBUG_OBJECT (pad, "Creating MPEG Audio, version 1 stream with "
"PID 0x%04x", ts_data->pid);
ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_AUDIO_MPEG1,
ts_data->pid);
break;
case 2:
GST_DEBUG_OBJECT (pad, "Creating MPEG Audio, version 2 stream with "
"PID 0x%04x", ts_data->pid);
ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_AUDIO_MPEG2,
ts_data->pid);
break;
case 4:
{
const GValue *value;
/* Codec data contains SPS/PPS which need to go in stream for valid ES */
value = gst_structure_get_value (s, "codec_data");
if (value) {
ts_data->codec_data = gst_buffer_ref (gst_value_get_buffer (value));
GST_DEBUG_OBJECT (pad, "we have additional codec data (%d bytes)",
GST_BUFFER_SIZE (ts_data->codec_data));
ts_data->prepare_func = mpegtsmux_prepare_aac;
} else {
ts_data->codec_data = NULL;
}
GST_DEBUG_OBJECT (pad, "Creating MPEG Audio, version 4 stream with "
"PID 0x%04x", ts_data->pid);
ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_AUDIO_AAC,
ts_data->pid);
break;
}
default:
GST_WARNING_OBJECT (pad, "unsupported mpegversion %d", mpegversion);
goto beach;
}
} else if (gst_structure_has_name (s, "video/mpeg")) {
gint mpegversion;
if (!gst_structure_get_int (s, "mpegversion", &mpegversion)) {
GST_ELEMENT_ERROR (mux, STREAM, FORMAT,
("Invalid data format presented"),
("Caps with type video/mpeg did not have mpegversion"));
goto beach;
}
if (mpegversion == 1) {
GST_DEBUG_OBJECT (pad,
"Creating MPEG Video, version 1 stream with PID 0x%04x",
ts_data->pid);
ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_VIDEO_MPEG1,
ts_data->pid);
} else if (mpegversion == 2) {
GST_DEBUG_OBJECT (pad,
"Creating MPEG Video, version 2 stream with PID 0x%04x",
ts_data->pid);
ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_VIDEO_MPEG2,
ts_data->pid);
} else {
GST_DEBUG_OBJECT (pad,
"Creating MPEG Video, version 4 stream with PID 0x%04x",
ts_data->pid);
ts_data->stream = tsmux_create_stream (mux->tsmux, TSMUX_ST_VIDEO_MPEG4,
ts_data->pid);
}
}
if (ts_data->stream != NULL) {
gst_structure_get_int (s, "rate", &ts_data->stream->audio_sampling);
gst_structure_get_int (s, "channels", &ts_data->stream->audio_channels);
gst_structure_get_int (s, "bitrate", &ts_data->stream->audio_bitrate);
tsmux_stream_set_buffer_release_func (ts_data->stream, release_buffer_cb);
tsmux_program_add_stream (ts_data->prog, ts_data->stream);
ret = GST_FLOW_OK;
}
beach:
gst_caps_unref (caps);
return ret;
}
static GstFlowReturn
mpegtsmux_create_streams (MpegTsMux * mux)
{
GstFlowReturn ret = GST_FLOW_OK;
GSList *walk = mux->collect->data;
/* Create the streams */
while (walk) {
GstCollectData *c_data = (GstCollectData *) walk->data;
MpegTsPadData *ts_data = (MpegTsPadData *) walk->data;
gchar *name = NULL;
walk = g_slist_next (walk);
if (ts_data->prog_id == -1) {
name = GST_PAD_NAME (c_data->pad);
if (mux->prog_map != NULL && gst_structure_has_field (mux->prog_map,
name)) {
gint idx;
gboolean ret = gst_structure_get_int (mux->prog_map, name, &idx);
if (!ret) {
GST_ELEMENT_ERROR (mux, STREAM, MUX,
("Reading program map failed. Assuming default"), (NULL));
idx = DEFAULT_PROG_ID;
}
if (idx < 0 || idx >= MAX_PROG_NUMBER) {
GST_DEBUG_OBJECT (mux, "Program number %d associate with pad %s out "
"of range (max = %d); DEFAULT_PROGRAM = %d is used instead",
idx, name, MAX_PROG_NUMBER, DEFAULT_PROG_ID);
idx = DEFAULT_PROG_ID;
}
ts_data->prog_id = idx;
} else {
ts_data->prog_id = DEFAULT_PROG_ID;
}
}
ts_data->prog = mux->programs[ts_data->prog_id];
if (ts_data->prog == NULL) {
ts_data->prog = tsmux_program_new (mux->tsmux);
if (ts_data->prog == NULL)
goto no_program;
tsmux_set_pmt_interval (ts_data->prog, mux->pmt_interval);
mux->programs[ts_data->prog_id] = ts_data->prog;
}
if (ts_data->stream == NULL) {
ret = mpegtsmux_create_stream (mux, ts_data, c_data->pad);
if (ret != GST_FLOW_OK)
goto no_stream;
}
}
return GST_FLOW_OK;
no_program:
GST_ELEMENT_ERROR (mux, STREAM, MUX,
("Could not create new program"), (NULL));
return GST_FLOW_ERROR;
no_stream:
GST_ELEMENT_ERROR (mux, STREAM, MUX,
("Could not create handler for stream"), (NULL));
return ret;
}
static MpegTsPadData *
mpegtsmux_choose_best_stream (MpegTsMux * mux)
{
MpegTsPadData *best = NULL;
GstCollectData *c_best = NULL;
GSList *walk;
for (walk = mux->collect->data; walk != NULL; walk = g_slist_next (walk)) {
GstCollectData *c_data = (GstCollectData *) walk->data;
MpegTsPadData *ts_data = (MpegTsPadData *) walk->data;
if (ts_data->eos == FALSE) {
if (ts_data->queued_buf == NULL) {
GstBuffer *buf;
ts_data->queued_buf = buf =
gst_collect_pads_peek (mux->collect, c_data);
if (buf != NULL) {
if (ts_data->prepare_func) {
buf = ts_data->prepare_func (buf, ts_data, mux);
if (buf) { /* Take the prepared buffer instead */
gst_buffer_unref (ts_data->queued_buf);
ts_data->queued_buf = buf;
} else { /* If data preparation returned NULL, use unprepared one */
buf = ts_data->queued_buf;
}
}
if (GST_BUFFER_TIMESTAMP (buf) != GST_CLOCK_TIME_NONE) {
/* Ignore timestamps that go backward for now. FIXME: Handle all
* incoming PTS */
if (ts_data->last_ts == GST_CLOCK_TIME_NONE ||
ts_data->last_ts < GST_BUFFER_TIMESTAMP (buf)) {
ts_data->cur_ts = ts_data->last_ts =
gst_segment_to_running_time (&c_data->segment,
GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (buf));
} else {
GST_DEBUG_OBJECT (mux, "Ignoring PTS that has gone backward");
}
} else
ts_data->cur_ts = GST_CLOCK_TIME_NONE;
GST_DEBUG_OBJECT (mux, "Pulled buffer with ts %" GST_TIME_FORMAT
" (uncorrected ts %" GST_TIME_FORMAT " %" G_GUINT64_FORMAT
") for PID 0x%04x",
GST_TIME_ARGS (ts_data->cur_ts),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
GST_BUFFER_TIMESTAMP (buf), ts_data->pid);
/* Choose a stream we've never seen a timestamp for to ensure
* we push enough buffers from it to reach a timestamp */
if (ts_data->last_ts == GST_CLOCK_TIME_NONE) {
best = ts_data;
c_best = c_data;
}
} else {
ts_data->eos = TRUE;
continue;
}
}
/* If we don't yet have a best pad, take this one, otherwise take
* whichever has the oldest timestamp */
if (best != NULL) {
if (ts_data->last_ts != GST_CLOCK_TIME_NONE &&
best->last_ts != GST_CLOCK_TIME_NONE &&
ts_data->last_ts < best->last_ts) {
best = ts_data;
c_best = c_data;
}
} else {
best = ts_data;
c_best = c_data;
}
}
}
if (c_best) {
GstBuffer *buffer;
if ((buffer = gst_collect_pads_pop (mux->collect, c_best)))
gst_buffer_unref (buffer);
}
return best;
}
#define COLLECT_DATA_PAD(collect_data) (((GstCollectData *)(collect_data))->pad)
static GstFlowReturn
mpegtsmux_collected (GstCollectPads * pads, MpegTsMux * mux)
{
GstFlowReturn ret = GST_FLOW_OK;
MpegTsPadData *best = NULL;
GST_DEBUG_OBJECT (mux, "Pads collected");
if (G_UNLIKELY (mux->first)) {
ret = mpegtsmux_create_streams (mux);
if (G_UNLIKELY (ret != GST_FLOW_OK))
return ret;
mpegtsdemux_prepare_srcpad (mux);
mux->first = FALSE;
}
best = mpegtsmux_choose_best_stream (mux);
if (best != NULL) {
TsMuxProgram *prog = best->prog;
GstBuffer *buf = best->queued_buf;
gint64 pts = -1;
gboolean delta = TRUE;
if (prog == NULL) {
GST_ELEMENT_ERROR (mux, STREAM, MUX,
("Stream on pad %" GST_PTR_FORMAT
" is not associated with any program", COLLECT_DATA_PAD (best)),
(NULL));
return GST_FLOW_ERROR;
}
if (G_UNLIKELY (prog->pcr_stream == NULL)) {
if (best) {
/* Take the first data stream for the PCR */
GST_DEBUG_OBJECT (COLLECT_DATA_PAD (best),
"Use stream (pid=%d) from pad as PCR for program (prog_id = %d)",
MPEG_TS_PAD_DATA (best)->pid, MPEG_TS_PAD_DATA (best)->prog_id);
/* Set the chosen PCR stream */
tsmux_program_set_pcr_stream (prog, best->stream);
}
}
g_return_val_if_fail (buf != NULL, GST_FLOW_ERROR);
if (best->stream->is_video_stream)
delta = GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
GST_DEBUG_OBJECT (mux, "delta: %d", delta);
GST_DEBUG_OBJECT (COLLECT_DATA_PAD (best),
"Chose stream for output (PID: 0x%04x)", best->pid);
if (GST_CLOCK_TIME_IS_VALID (best->cur_ts)) {
pts = GSTTIME_TO_MPEGTIME (best->cur_ts);
GST_DEBUG_OBJECT (mux, "Buffer has TS %" GST_TIME_FORMAT " pts %"
G_GINT64_FORMAT, GST_TIME_ARGS (best->cur_ts), pts);
}
tsmux_stream_add_data (best->stream, GST_BUFFER_DATA (buf),
GST_BUFFER_SIZE (buf), buf, pts, -1, !delta);
best->queued_buf = NULL;
mux->is_delta = delta;
while (tsmux_stream_bytes_in_buffer (best->stream) > 0) {
if (!tsmux_write_stream_packet (mux->tsmux, best->stream)) {
/* Failed writing data for some reason. Set appropriate error */
GST_DEBUG_OBJECT (mux, "Failed to write data packet");
GST_ELEMENT_ERROR (mux, STREAM, MUX,
("Failed writing output data to stream %04x", best->stream->id),
(NULL));
goto write_fail;
}
}
if (prog->pcr_stream == best->stream) {
mux->last_ts = best->last_ts;
}
} else {
/* FIXME: Drain all remaining streams */
/* At EOS */
gst_pad_push_event (mux->srcpad, gst_event_new_eos ());
}
return ret;
write_fail:
return mux->last_flow_ret;
}
static GstPad *
mpegtsmux_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name)
{
MpegTsMux *mux = GST_MPEG_TSMUX (element);
gint pid = -1;
gchar *pad_name = NULL;
GstPad *pad = NULL;
MpegTsPadData *pad_data = NULL;
if (name != NULL && sscanf (name, "sink_%d", &pid) == 1) {
if (tsmux_find_stream (mux->tsmux, pid))
goto stream_exists;
} else {
pid = tsmux_get_new_pid (mux->tsmux);
}
pad_name = g_strdup_printf ("sink_%d", pid);
pad = gst_pad_new_from_template (templ, pad_name);
g_free (pad_name);
pad_data = (MpegTsPadData *) gst_collect_pads_add_pad (mux->collect, pad,
sizeof (MpegTsPadData));
if (pad_data == NULL)
goto pad_failure;
pad_data->pid = pid;
pad_data->last_ts = GST_CLOCK_TIME_NONE;
pad_data->codec_data = NULL;
pad_data->prepare_data = NULL;
pad_data->prepare_func = NULL;
pad_data->free_func = NULL;
pad_data->prog_id = -1;
pad_data->prog = NULL;
if (G_UNLIKELY (!gst_element_add_pad (element, pad)))
goto could_not_add;
return pad;
stream_exists:
GST_ELEMENT_ERROR (element, STREAM, MUX, ("Duplicate PID requested"), (NULL));
return NULL;
could_not_add:
GST_ELEMENT_ERROR (element, STREAM, FAILED,
("Internal data stream error."), ("Could not add pad to element"));
gst_collect_pads_remove_pad (mux->collect, pad);
gst_object_unref (pad);
return NULL;
pad_failure:
GST_ELEMENT_ERROR (element, STREAM, FAILED,
("Internal data stream error."), ("Could not add pad to collectpads"));
gst_object_unref (pad);
return NULL;
}
static void
mpegtsmux_release_pad (GstElement * element, GstPad * pad)
{
MpegTsMux *mux = GST_MPEG_TSMUX (element);
GST_DEBUG_OBJECT (mux, "Pad %" GST_PTR_FORMAT " being released", pad);
if (mux->collect) {
gst_collect_pads_remove_pad (mux->collect, pad);
}
/* chain up */
gst_element_remove_pad (element, pad);
}
static void
new_packet_common_init (MpegTsMux * mux, GstBuffer * buf, guint8 * data,
guint len)
{
/* Packets should be at least 188 bytes, but check anyway */
g_return_if_fail (len >= 2);
if (!mux->streamheader_sent) {
guint pid = ((data[1] & 0x1f) << 8) | data[2];
/* if it's a PAT or a PMT */
if (pid == 0x00 || (pid >= TSMUX_START_PMT_PID && pid < TSMUX_START_ES_PID)) {
mux->streamheader =
g_list_append (mux->streamheader, gst_buffer_copy (buf));
} else if (mux->streamheader) {
mpegtsdemux_set_header_on_caps (mux);
mux->streamheader_sent = TRUE;
}
}
/* Set the caps on the buffer only after possibly setting the stream headers
* into the pad caps above */
gst_buffer_set_caps (buf, GST_PAD_CAPS (mux->srcpad));
if (mux->is_delta) {
GST_LOG_OBJECT (mux, "marking as delta unit");
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
} else {
GST_DEBUG_OBJECT (mux, "marking as non-delta unit");
mux->is_delta = TRUE;
}
}
static gboolean
new_packet_m2ts (MpegTsMux * mux, guint8 * data, guint len, gint64 new_pcr)
{
GstBuffer *buf, *out_buf;
GstFlowReturn ret;
int chunk_bytes;
GST_LOG_OBJECT (mux, "Have buffer with new_pcr=%" G_GINT64_FORMAT " size %d",
new_pcr, len);
buf = gst_buffer_new_and_alloc (M2TS_PACKET_LENGTH);
if (G_UNLIKELY (buf == NULL)) {
GST_ELEMENT_ERROR (mux, STREAM, MUX,
("Failed allocating output buffer"), (NULL));
mux->last_flow_ret = GST_FLOW_ERROR;
return FALSE;
}
new_packet_common_init (mux, buf, data, len);
/* copies the TS data of 188 bytes to the m2ts buffer at an offset
of 4 bytes to leave space for writing the timestamp later */
memcpy (GST_BUFFER_DATA (buf) + 4, data, len);
if (new_pcr < 0) {
/* If theres no pcr in current ts packet then just add the packet
to the adapter for later output when we see a PCR */
GST_LOG_OBJECT (mux, "Accumulating non-PCR packet");
gst_adapter_push (mux->adapter, buf);
return TRUE;
}
chunk_bytes = gst_adapter_available (mux->adapter);
/* We have a new PCR, output anything in the adapter */
if (mux->first_pcr) {
/* We can't generate sensible timestamps for anything that might
* be in the adapter preceding the first PCR and will hit a divide
* by zero, so empty the adapter. This is probably a null op. */
gst_adapter_clear (mux->adapter);
/* Warn if we threw anything away */
if (chunk_bytes) {
GST_ELEMENT_WARNING (mux, STREAM, MUX,
("Discarding %d bytes from stream preceding first PCR",
chunk_bytes / M2TS_PACKET_LENGTH * NORMAL_TS_PACKET_LENGTH),
(NULL));
chunk_bytes = 0;
}
mux->first_pcr = FALSE;
}
if (chunk_bytes) {
/* Start the PCR offset counting at 192 bytes: At the end of the packet
* that had the last PCR */
guint64 pcr_bytes = M2TS_PACKET_LENGTH, ts_rate;
/* Include the pending packet size to get the ts_rate right */
chunk_bytes += M2TS_PACKET_LENGTH;
/* calculate rate based on latest and previous pcr values */
ts_rate = gst_util_uint64_scale (chunk_bytes, CLOCK_FREQ_SCR,
(new_pcr - mux->previous_pcr));
GST_LOG_OBJECT (mux, "Processing pending packets with ts_rate %"
G_GUINT64_FORMAT, ts_rate);
while (1) {
guint64 cur_pcr;
/* Loop, pulling packets of the adapter, updating their 4 byte
* timestamp header and pushing */
/* The header is the bottom 30 bits of the PCR, apparently not
* encoded into base + ext as in the packets themselves, so
* we can just interpolate, mask and insert */
cur_pcr = (mux->previous_pcr +
gst_util_uint64_scale (pcr_bytes, CLOCK_FREQ_SCR, ts_rate));
out_buf = gst_adapter_take_buffer (mux->adapter, M2TS_PACKET_LENGTH);
if (G_UNLIKELY (!out_buf))
break;
gst_buffer_set_caps (out_buf, GST_PAD_CAPS (mux->srcpad));
GST_BUFFER_TIMESTAMP (out_buf) = MPEG_SYS_TIME_TO_GSTTIME (cur_pcr);
/* Write the 4 byte timestamp value, bottom 30 bits only = PCR */
GST_WRITE_UINT32_BE (GST_BUFFER_DATA (out_buf), cur_pcr & 0x3FFFFFFF);
GST_LOG_OBJECT (mux, "Outputting a packet of length %d PCR %"
G_GUINT64_FORMAT, M2TS_PACKET_LENGTH, cur_pcr);
ret = gst_pad_push (mux->srcpad, out_buf);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
mux->last_flow_ret = ret;
return FALSE;
}
pcr_bytes += M2TS_PACKET_LENGTH;
}
}
/* Finally, output the passed in packet */
/* Only write the bottom 30 bits of the PCR */
GST_WRITE_UINT32_BE (GST_BUFFER_DATA (buf), new_pcr & 0x3FFFFFFF);
GST_BUFFER_TIMESTAMP (buf) = MPEG_SYS_TIME_TO_GSTTIME (new_pcr);
GST_LOG_OBJECT (mux, "Outputting a packet of length %d PCR %"
G_GUINT64_FORMAT, M2TS_PACKET_LENGTH, new_pcr);
ret = gst_pad_push (mux->srcpad, buf);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
mux->last_flow_ret = ret;
return FALSE;
}
mux->previous_pcr = new_pcr;
return TRUE;
}
static gboolean
new_packet_normal_ts (MpegTsMux * mux, guint8 * data, guint len, gint64 new_pcr)
{
GstBuffer *buf;
GstFlowReturn ret;
/* Output a normal TS packet */
GST_LOG_OBJECT (mux, "Outputting a packet of length %d", len);
buf = gst_buffer_new_and_alloc (len);
if (G_UNLIKELY (buf == NULL)) {
mux->last_flow_ret = GST_FLOW_ERROR;
return FALSE;
}
new_packet_common_init (mux, buf, data, len);
memcpy (GST_BUFFER_DATA (buf), data, len);
GST_BUFFER_TIMESTAMP (buf) = mux->last_ts;
ret = gst_pad_push (mux->srcpad, buf);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
mux->last_flow_ret = ret;
return FALSE;
}
return TRUE;
}
static gboolean
new_packet_cb (guint8 * data, guint len, void *user_data, gint64 new_pcr)
{
/* Called when the TsMux has prepared a packet for output. Return FALSE
* on error */
MpegTsMux *mux = (MpegTsMux *) user_data;
if (mux->m2ts_mode == TRUE) {
return new_packet_m2ts (mux, data, len, new_pcr);
}
return new_packet_normal_ts (mux, data, len, new_pcr);
}
static void
mpegtsdemux_set_header_on_caps (MpegTsMux * mux)
{
GstBuffer *buf;
GstStructure *structure;
GValue array = { 0 };
GValue value = { 0 };
GstCaps *caps;
GList *sh;
caps = gst_caps_copy (GST_PAD_CAPS (mux->srcpad));
structure = gst_caps_get_structure (caps, 0);
g_value_init (&array, GST_TYPE_ARRAY);
sh = mux->streamheader;
while (sh) {
buf = sh->data;
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_IN_CAPS);
g_value_init (&value, GST_TYPE_BUFFER);
gst_value_take_buffer (&value, buf);
gst_value_array_append_value (&array, &value);
g_value_unset (&value);
sh = g_list_next (sh);
}
g_list_free (mux->streamheader);
mux->streamheader = NULL;
gst_structure_set_value (structure, "streamheader", &array);
gst_pad_set_caps (mux->srcpad, caps);
g_value_unset (&array);
gst_caps_unref (caps);
}
static void
mpegtsdemux_prepare_srcpad (MpegTsMux * mux)
{
GstEvent *new_seg =
gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_BYTES, 0, -1, 0);
GstCaps *caps = gst_caps_new_simple ("video/mpegts",
"systemstream", G_TYPE_BOOLEAN, TRUE,
"packetsize", G_TYPE_INT,
(mux->m2ts_mode ? M2TS_PACKET_LENGTH : NORMAL_TS_PACKET_LENGTH),
NULL);
/* Set caps on src pad from our template and push new segment */
gst_pad_set_caps (mux->srcpad, caps);
gst_caps_unref (caps);
if (!gst_pad_push_event (mux->srcpad, new_seg)) {
GST_WARNING_OBJECT (mux, "New segment event was not handled downstream");
}
}
static GstStateChangeReturn
mpegtsmux_change_state (GstElement * element, GstStateChange transition)
{
MpegTsMux *mux = GST_MPEG_TSMUX (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_collect_pads_start (mux->collect);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_collect_pads_stop (mux->collect);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
if (mux->adapter)
gst_adapter_clear (mux->adapter);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
default:
break;
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "mpegtsmux", GST_RANK_PRIMARY,
mpegtsmux_get_type ()))
return FALSE;
GST_DEBUG_CATEGORY_INIT (mpegtsmux_debug, "mpegtsmux", 0,
"MPEG Transport Stream muxer");
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR,
"mpegtsmux", "MPEG-TS muxer",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
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