gstreamer/gst/mpegtsmux/gstmpegtsmux.c
Mathieu Duponchelle 02ded087a4 mpegtsmux: add SECTION comment
We include an example for injecting sections in the transport
stream in the documentation
2019-05-30 13:53:05 +00:00

428 lines
14 KiB
C

/*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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.
*
*/
/**
* SECTION: element-mpegtsmux
* @title: MPEG Transport Stream muxer
*
* mpegtsmux muxes different streams into an MPEG Transport stream
*
* SI sections can be specified through a custom event:
*
* {{ tests/examples/mpegts/ts-section-writer.c }}
*/
#include "gstmpegtsmux.h"
#include <string.h>
#define MPEGTSMUX_DEFAULT_M2TS FALSE
#define M2TS_PACKET_LENGTH 192
enum
{
PROP_0,
PROP_M2TS_MODE,
};
static GstStaticPadTemplate gst_mpeg_ts_mux_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink_%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("video/mpeg, "
"parsed = (boolean) TRUE, "
"mpegversion = (int) { 1, 2, 4 }, "
"systemstream = (boolean) false; "
"video/x-dirac;"
"image/x-jpc;"
"video/x-h264,stream-format=(string)byte-stream,"
"alignment=(string){au, nal}; "
"video/x-h265,stream-format=(string)byte-stream,"
"alignment=(string){au, nal}; "
"audio/mpeg, "
"parsed = (boolean) TRUE, "
"mpegversion = (int) { 1, 2 };"
"audio/mpeg, "
"framed = (boolean) TRUE, "
"mpegversion = (int) 4, stream-format = (string) adts;"
"audio/mpeg, "
"mpegversion = (int) 4, stream-format = (string) raw;"
"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, framed = (boolean) TRUE;"
"audio/x-dts, framed = (boolean) TRUE;"
"audio/x-opus, "
"channels = (int) [1, 8], "
"channel-mapping-family = (int) {0, 1};"
"subpicture/x-dvb; application/x-teletext; meta/x-klv, parsed=true;"
"image/x-jpc, profile = (int)[0, 49151];"));
static GstStaticPadTemplate gst_mpeg_ts_mux_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} ")
);
GST_DEBUG_CATEGORY (gst_mpeg_ts_mux_debug);
#define GST_CAT_DEFAULT gst_mpeg_ts_mux_debug
G_DEFINE_TYPE (GstMpegTsMux, gst_mpeg_ts_mux, GST_TYPE_BASE_TS_MUX);
#define parent_class gst_mpeg_ts_mux_parent_class
/* Internals */
static gboolean
new_packet_m2ts (GstMpegTsMux * mux, GstBuffer * buf, gint64 new_pcr)
{
GstBuffer *out_buf;
int chunk_bytes;
GstMapInfo map;
GST_LOG_OBJECT (mux, "Have buffer %p with new_pcr=%" G_GINT64_FORMAT,
buf, new_pcr);
chunk_bytes = gst_adapter_available (mux->adapter);
if (G_LIKELY (buf)) {
if (new_pcr < 0) {
/* If there is 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);
goto exit;
}
/* no first interpolation point yet, then this is the one,
* otherwise it is the second interpolation point */
if (mux->previous_pcr < 0 && chunk_bytes) {
mux->previous_pcr = new_pcr;
mux->previous_offset = chunk_bytes;
GST_LOG_OBJECT (mux, "Accumulating non-PCR packet");
gst_adapter_push (mux->adapter, buf);
goto exit;
}
} else {
g_assert (new_pcr == -1);
}
/* interpolate if needed, and 2 points available */
if (chunk_bytes && (new_pcr != mux->previous_pcr)) {
gint64 offset = 0;
GST_LOG_OBJECT (mux, "Processing pending packets; "
"previous pcr %" G_GINT64_FORMAT ", previous offset %d, "
"current pcr %" G_GINT64_FORMAT ", current offset %d",
mux->previous_pcr, (gint) mux->previous_offset,
new_pcr, (gint) chunk_bytes);
g_assert (chunk_bytes > mux->previous_offset);
/* if draining, use previous rate */
if (G_LIKELY (new_pcr > 0)) {
mux->pcr_rate_num = new_pcr - mux->previous_pcr;
mux->pcr_rate_den = chunk_bytes - mux->previous_offset;
}
while (offset < chunk_bytes) {
guint64 cur_pcr, ts;
/* Loop, pulling packets of the adapter, updating their 4 byte
* timestamp header and pushing */
/* interpolate PCR */
if (G_LIKELY (offset >= mux->previous_offset))
cur_pcr = mux->previous_pcr +
gst_util_uint64_scale (offset - mux->previous_offset,
mux->pcr_rate_num, mux->pcr_rate_den);
else
cur_pcr = mux->previous_pcr -
gst_util_uint64_scale (mux->previous_offset - offset,
mux->pcr_rate_num, mux->pcr_rate_den);
/* FIXME: what about DTS here? */
ts = gst_adapter_prev_pts (mux->adapter, NULL);
out_buf = gst_adapter_take_buffer (mux->adapter, M2TS_PACKET_LENGTH);
g_assert (out_buf);
offset += M2TS_PACKET_LENGTH;
GST_BUFFER_PTS (out_buf) = ts;
gst_buffer_map (out_buf, &map, GST_MAP_WRITE);
/* The header is the bottom 30 bits of the PCR, apparently not
* encoded into base + ext as in the packets themselves */
GST_WRITE_UINT32_BE (map.data, cur_pcr & 0x3FFFFFFF);
gst_buffer_unmap (out_buf, &map);
GST_LOG_OBJECT (mux, "Outputting a packet of length %d PCR %"
G_GUINT64_FORMAT, M2TS_PACKET_LENGTH, cur_pcr);
((GstBaseTsMuxClass *)
parent_class)->output_packet (GST_BASE_TS_MUX (mux), out_buf, -1);
}
}
if (G_UNLIKELY (!buf))
goto exit;
gst_buffer_map (buf, &map, GST_MAP_WRITE);
/* Finally, output the passed in packet */
/* Only write the bottom 30 bits of the PCR */
GST_WRITE_UINT32_BE (map.data, new_pcr & 0x3FFFFFFF);
gst_buffer_unmap (buf, &map);
GST_LOG_OBJECT (mux, "Outputting a packet of length %d PCR %"
G_GUINT64_FORMAT, M2TS_PACKET_LENGTH, new_pcr);
((GstBaseTsMuxClass *) parent_class)->output_packet (GST_BASE_TS_MUX (mux),
buf, -1);
if (new_pcr != mux->previous_pcr) {
mux->previous_pcr = new_pcr;
mux->previous_offset = -M2TS_PACKET_LENGTH;
}
exit:
return TRUE;
}
/* GstBaseTsMux implementation */
static void
gst_mpeg_ts_mux_allocate_packet (GstBaseTsMux * mux, GstBuffer ** buffer)
{
((GstBaseTsMuxClass *) parent_class)->allocate_packet (mux, buffer);
gst_buffer_set_size (*buffer, GST_BASE_TS_MUX_NORMAL_PACKET_LENGTH);
}
static gboolean
gst_mpeg_ts_mux_output_packet (GstBaseTsMux * base_tsmux, GstBuffer * buffer,
gint64 new_pcr)
{
GstMpegTsMux *mux = GST_MPEG_TS_MUX (base_tsmux);
GstMapInfo map;
if (!mux->m2ts_mode)
return ((GstBaseTsMuxClass *) parent_class)->output_packet (base_tsmux,
buffer, new_pcr);
gst_buffer_set_size (buffer, M2TS_PACKET_LENGTH);
gst_buffer_map (buffer, &map, GST_MAP_READWRITE);
/* there should be a better way to do this */
memmove (map.data + 4, map.data, map.size - 4);
gst_buffer_unmap (buffer, &map);
return new_packet_m2ts (mux, buffer, new_pcr);
}
static void
gst_mpeg_ts_mux_reset (GstBaseTsMux * base_tsmux)
{
GstMpegTsMux *mux = GST_MPEG_TS_MUX (base_tsmux);
if (mux->adapter)
gst_adapter_clear (mux->adapter);
mux->previous_pcr = -1;
mux->previous_offset = 0;
mux->pcr_rate_num = mux->pcr_rate_den = 1;
}
static gboolean
gst_mpeg_ts_mux_drain (GstBaseTsMux * mux)
{
return new_packet_m2ts (GST_MPEG_TS_MUX (mux), NULL, -1);
}
/* GObject implementation */
static void
gst_mpeg_ts_mux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMpegTsMux *mux = GST_MPEG_TS_MUX (object);
switch (prop_id) {
case PROP_M2TS_MODE:
/* set incase if the output stream need to be of 192 bytes */
mux->m2ts_mode = g_value_get_boolean (value);
gst_base_ts_mux_set_packet_size (GST_BASE_TS_MUX (mux),
mux->m2ts_mode ? M2TS_PACKET_LENGTH :
GST_BASE_TS_MUX_NORMAL_PACKET_LENGTH);
gst_base_ts_mux_set_automatic_alignment (GST_BASE_TS_MUX (mux),
mux->m2ts_mode ? 32 : 0);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_mpeg_ts_mux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstMpegTsMux *mux = GST_MPEG_TS_MUX (object);
switch (prop_id) {
case PROP_M2TS_MODE:
g_value_set_boolean (value, mux->m2ts_mode);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_mpeg_ts_mux_dispose (GObject * object)
{
GstMpegTsMux *mux = GST_MPEG_TS_MUX (object);
if (mux->adapter) {
g_object_unref (mux->adapter);
mux->adapter = NULL;
}
GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object));
}
static void
gst_mpeg_ts_mux_class_init (GstMpegTsMuxClass * klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBaseTsMuxClass *base_tsmux_class = GST_BASE_TS_MUX_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (gst_mpeg_ts_mux_debug, "mpegtsmux", 0,
"MPEG Transport Stream muxer");
gobject_class->set_property =
GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_get_property);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_dispose);
base_tsmux_class->allocate_packet =
GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_allocate_packet);
base_tsmux_class->output_packet =
GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_output_packet);
base_tsmux_class->reset = GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_reset);
base_tsmux_class->drain = GST_DEBUG_FUNCPTR (gst_mpeg_ts_mux_drain);
gst_element_class_set_static_metadata (gstelement_class,
"MPEG Transport Stream Muxer", "Codec/Muxer",
"Multiplexes media streams into an MPEG Transport Stream",
"Fluendo <contact@fluendo.com>");
gst_element_class_add_static_pad_template_with_gtype (gstelement_class,
&gst_mpeg_ts_mux_sink_factory, GST_TYPE_BASE_TS_MUX_PAD);
gst_element_class_add_static_pad_template_with_gtype (gstelement_class,
&gst_mpeg_ts_mux_src_factory, GST_TYPE_AGGREGATOR_PAD);
g_object_class_install_property (gobject_class, PROP_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.",
MPEGTSMUX_DEFAULT_M2TS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
gst_mpeg_ts_mux_init (GstMpegTsMux * mux)
{
mux->m2ts_mode = MPEGTSMUX_DEFAULT_M2TS;
mux->adapter = gst_adapter_new ();
}