mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-12-26 10:10:32 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst/mpegtsmux/tsmux/tsmuxstream.c
Thibault Saunier b148c22cec mpegtsmux: Properly add subtitle descriptor for DVb subpicture subtitles 
We were adding an empty descriptor for them and it was not possible to
actually use them on muxed streams.
2013-11-13 17:56:07 -03:00

973 lines
27 KiB
C
Raw Blame History

/*
* Copyright 2006 BBC and Fluendo S.A.
*
* 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.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "tsmuxcommon.h"
#include "tsmuxstream.h"
#define GST_CAT_DEFAULT mpegtsmux_debug
static guint8 tsmux_stream_pes_header_length (TsMuxStream * stream);
static void tsmux_stream_write_pes_header (TsMuxStream * stream, guint8 * data);
static void tsmux_stream_find_pts_dts_within (TsMuxStream * stream, guint bound,
gint64 * pts, gint64 * dts);
struct TsMuxStreamBuffer
{
guint8 *data;
guint32 size;
/* PTS & DTS associated with the contents of this buffer */
gint64 pts;
gint64 dts;
/* data represents random access point */
gboolean random_access;
/* user_data for release function */
void *user_data;
};
/**
* tsmux_stream_new:
* @pid: a PID
* @stream_type: the stream type
*
* Create a new stream with PID of @pid and @stream_type.
*
* Returns: a new #TsMuxStream.
*/
TsMuxStream *
tsmux_stream_new (guint16 pid, TsMuxStreamType stream_type)
{
TsMuxStream *stream = g_slice_new0 (TsMuxStream);
stream->state = TSMUX_STREAM_STATE_HEADER;
stream->pi.pid = pid;
stream->stream_type = stream_type;
stream->pes_payload_size = 0;
stream->cur_pes_payload_size = 0;
stream->pes_bytes_written = 0;
switch (stream_type) {
case TSMUX_ST_VIDEO_MPEG1:
case TSMUX_ST_VIDEO_MPEG2:
case TSMUX_ST_VIDEO_MPEG4:
case TSMUX_ST_VIDEO_H264:
/* FIXME: Assign sequential IDs? */
stream->id = 0xE0;
stream->pi.flags |= TSMUX_PACKET_FLAG_PES_FULL_HEADER;
stream->is_video_stream = TRUE;
break;
case TSMUX_ST_AUDIO_AAC:
case TSMUX_ST_AUDIO_MPEG1:
case TSMUX_ST_AUDIO_MPEG2:
/* FIXME: Assign sequential IDs? */
stream->id = 0xC0;
stream->pi.flags |= TSMUX_PACKET_FLAG_PES_FULL_HEADER;
break;
case TSMUX_ST_VIDEO_DIRAC:
case TSMUX_ST_PS_AUDIO_LPCM:
case TSMUX_ST_PS_AUDIO_AC3:
case TSMUX_ST_PS_AUDIO_DTS:
stream->id = 0xFD;
/* FIXME: assign sequential extended IDs? */
switch (stream_type) {
case TSMUX_ST_VIDEO_DIRAC:
stream->id_extended = 0x60;
stream->is_video_stream = TRUE;
break;
case TSMUX_ST_PS_AUDIO_LPCM:
stream->id_extended = 0x80;
break;
case TSMUX_ST_PS_AUDIO_AC3:
stream->id_extended = 0x71;
break;
case TSMUX_ST_PS_AUDIO_DTS:
stream->id_extended = 0x82;
break;
default:
break;
}
stream->pi.flags |=
TSMUX_PACKET_FLAG_PES_FULL_HEADER |
TSMUX_PACKET_FLAG_PES_EXT_STREAMID;
break;
case TSMUX_ST_PS_TELETEXT:
/* needs fixes PES header length */
stream->pi.pes_header_length = 36;
case TSMUX_ST_PS_DVB_SUBPICTURE:
/* private stream 1 */
stream->id = 0xBD;
stream->is_dvb_sub = TRUE;
stream->stream_type = TSMUX_ST_PRIVATE_DATA;
stream->pi.flags |=
TSMUX_PACKET_FLAG_PES_FULL_HEADER |
TSMUX_PACKET_FLAG_PES_DATA_ALIGNMENT;
break;
default:
g_critical ("Stream type 0x%0x not yet implemented", stream_type);
break;
}
stream->last_pts = -1;
stream->last_dts = -1;
stream->pcr_ref = 0;
stream->last_pcr = -1;
return stream;
}
/**
* tsmux_stream_get_pid:
* @stream: a #TsMuxStream
*
* Get the PID of @stream.
*
* Returns: The PID of @stream. 0xffff on error.
*/
guint16
tsmux_stream_get_pid (TsMuxStream * stream)
{
g_return_val_if_fail (stream != NULL, G_MAXUINT16);
return stream->pi.pid;
}
/**
* tsmux_stream_free:
* @stream: a #TsMuxStream
*
* Free the resources of @stream.
*/
void
tsmux_stream_free (TsMuxStream * stream)
{
GList *cur;
g_return_if_fail (stream != NULL);
/* free buffers */
for (cur = stream->buffers; cur; cur = cur->next) {
TsMuxStreamBuffer *tmbuf = (TsMuxStreamBuffer *) cur->data;
if (stream->buffer_release)
stream->buffer_release (tmbuf->data, tmbuf->user_data);
g_slice_free (TsMuxStreamBuffer, tmbuf);
}
g_list_free (stream->buffers);
g_slice_free (TsMuxStream, stream);
}
/**
* tsmux_stream_set_buffer_release_func:
* @stream: a #TsMuxStream
* @func: the new #TsMuxStreamBufferReleaseFunc
*
* Set the function that will be called when a a piece of data fed to @stream
* with tsmux_stream_add_data() can be freed. @func will be called with user
* data as provided with the call to tsmux_stream_add_data().
*/
void
tsmux_stream_set_buffer_release_func (TsMuxStream * stream,
TsMuxStreamBufferReleaseFunc func)
{
g_return_if_fail (stream != NULL);
stream->buffer_release = func;
}
/* Advance the current packet stream position by len bytes.
* Mustn't consume more than available in the current packet */
static void
tsmux_stream_consume (TsMuxStream * stream, guint len)
{
g_assert (stream->cur_buffer != NULL);
g_assert (len <= stream->cur_buffer->size - stream->cur_buffer_consumed);
stream->cur_buffer_consumed += len;
stream->bytes_avail -= len;
if (stream->cur_buffer_consumed == 0)
return;
if (stream->cur_buffer->pts != -1) {
stream->last_pts = stream->cur_buffer->pts;
stream->last_dts = stream->cur_buffer->dts;
} else if (stream->cur_buffer->dts != -1)
stream->last_dts = stream->cur_buffer->dts;
if (stream->cur_buffer_consumed == stream->cur_buffer->size) {
/* Current packet is completed, move along */
stream->buffers = g_list_delete_link (stream->buffers, stream->buffers);
if (stream->buffer_release) {
stream->buffer_release (stream->cur_buffer->data,
stream->cur_buffer->user_data);
}
g_slice_free (TsMuxStreamBuffer, stream->cur_buffer);
stream->cur_buffer = NULL;
/* FIXME: As a hack, for unbounded streams, start a new PES packet for each
* incoming packet we receive. This assumes that incoming data is
* packetised sensibly - ie, every video frame */
if (stream->cur_pes_payload_size == 0)
stream->state = TSMUX_STREAM_STATE_HEADER;
}
}
/**
* tsmux_stream_at_pes_start:
* @stream: a #TsMuxStream
*
* Check if @stream is at the start of a PES packet.
*
* Returns: TRUE if @stream is at a PES header packet.
*/
gboolean
tsmux_stream_at_pes_start (TsMuxStream * stream)
{
g_return_val_if_fail (stream != NULL, FALSE);
return stream->state == TSMUX_STREAM_STATE_HEADER;
}
/**
* tsmux_stream_bytes_avail:
* @stream: a #TsMuxStream
*
* Calculate how much bytes are available.
*
* Returns: The number of bytes available.
*/
static inline gint
_tsmux_stream_bytes_avail (TsMuxStream * stream)
{
gint bytes_avail;
g_return_val_if_fail (stream != NULL, 0);
if (stream->cur_pes_payload_size != 0)
bytes_avail = stream->cur_pes_payload_size - stream->pes_bytes_written;
else
bytes_avail = stream->bytes_avail;
bytes_avail = MIN (bytes_avail, stream->bytes_avail);
/* Calculate the number of bytes available in the current PES */
if (stream->state == TSMUX_STREAM_STATE_HEADER)
bytes_avail += tsmux_stream_pes_header_length (stream);
return bytes_avail;
}
gint
tsmux_stream_bytes_avail (TsMuxStream * stream)
{
g_return_val_if_fail (stream != NULL, 0);
return _tsmux_stream_bytes_avail (stream);
}
/**
* tsmux_stream_bytes_in_buffer:
* @stream: a #TsMuxStream
*
* Calculate how much bytes are in the buffer.
*
* Returns: The number of bytes in the buffer.
*/
gint
tsmux_stream_bytes_in_buffer (TsMuxStream * stream)
{
g_return_val_if_fail (stream != NULL, 0);
return stream->bytes_avail;
}
/**
* tsmux_stream_initialize_pes_packet:
* @stream: a #TsMuxStream
*
* Initializes the PES packet.
*
* Returns: TRUE if we the packet was initialized.
*/
gboolean
tsmux_stream_initialize_pes_packet (TsMuxStream * stream)
{
if (stream->state != TSMUX_STREAM_STATE_HEADER)
return TRUE;
if (stream->pes_payload_size != 0) {
/* Use prescribed fixed PES payload size */
stream->cur_pes_payload_size = stream->pes_payload_size;
tsmux_stream_find_pts_dts_within (stream, stream->cur_pes_payload_size,
&stream->pts, &stream->dts);
} else if (stream->is_video_stream) {
/* Unbounded for video streams */
stream->cur_pes_payload_size = 0;
tsmux_stream_find_pts_dts_within (stream, stream->bytes_avail, &stream->pts,
&stream->dts);
} else {
/* Output a PES packet of all currently available bytes otherwise */
stream->cur_pes_payload_size = stream->bytes_avail;
tsmux_stream_find_pts_dts_within (stream, stream->cur_pes_payload_size,
&stream->pts, &stream->dts);
}
stream->pi.flags &= ~(TSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS |
TSMUX_PACKET_FLAG_PES_WRITE_PTS);
if (stream->pts != -1 && stream->dts != -1 && stream->pts != stream->dts)
stream->pi.flags |= TSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS;
else {
if (stream->pts != -1)
stream->pi.flags |= TSMUX_PACKET_FLAG_PES_WRITE_PTS;
}
if (stream->buffers) {
TsMuxStreamBuffer *buf = (TsMuxStreamBuffer *) (stream->buffers->data);
if (buf->random_access) {
stream->pi.flags |= TSMUX_PACKET_FLAG_RANDOM_ACCESS;
stream->pi.flags |= TSMUX_PACKET_FLAG_ADAPTATION;
}
}
return TRUE;
}
/**
* tsmux_stream_get_data:
* @stream: a #TsMuxStream
* @buf: a buffer to hold the result
* @len: the length of @buf
*
* Copy up to @len available data in @stream into the buffer @buf.
*
* Returns: TRUE if @len bytes could be retrieved.
*/
gboolean
tsmux_stream_get_data (TsMuxStream * stream, guint8 * buf, guint len)
{
g_return_val_if_fail (stream != NULL, FALSE);
g_return_val_if_fail (buf != NULL, FALSE);
if (stream->state == TSMUX_STREAM_STATE_HEADER) {
guint8 pes_hdr_length;
pes_hdr_length = tsmux_stream_pes_header_length (stream);
/* Submitted buffer must be at least as large as the PES header */
if (len < pes_hdr_length)
return FALSE;
TS_DEBUG ("Writing PES header of length %u and payload %d",
pes_hdr_length, stream->cur_pes_payload_size);
tsmux_stream_write_pes_header (stream, buf);
len -= pes_hdr_length;
buf += pes_hdr_length;
stream->state = TSMUX_STREAM_STATE_PACKET;
}
if (len > (guint) _tsmux_stream_bytes_avail (stream))
return FALSE;
stream->pes_bytes_written += len;
if (stream->cur_pes_payload_size != 0 &&
stream->pes_bytes_written == stream->cur_pes_payload_size) {
TS_DEBUG ("Finished PES packet");
stream->state = TSMUX_STREAM_STATE_HEADER;
stream->pes_bytes_written = 0;
}
while (len > 0) {
guint32 avail;
guint8 *cur;
if (stream->cur_buffer == NULL) {
/* Start next packet */
if (stream->buffers == NULL)
return FALSE;
stream->cur_buffer = (TsMuxStreamBuffer *) (stream->buffers->data);
stream->cur_buffer_consumed = 0;
}
/* Take as much as we can from the current buffer */
avail = stream->cur_buffer->size - stream->cur_buffer_consumed;
cur = stream->cur_buffer->data + stream->cur_buffer_consumed;
if (avail < len) {
memcpy (buf, cur, avail);
tsmux_stream_consume (stream, avail);
buf += avail;
len -= avail;
} else {
memcpy (buf, cur, len);
tsmux_stream_consume (stream, len);
len = 0;
}
}
return TRUE;
}
static guint8
tsmux_stream_pes_header_length (TsMuxStream * stream)
{
guint8 packet_len;
/* Calculate the length of the header for this stream */
/* start_code prefix + stream_id + pes_packet_length = 6 bytes */
packet_len = 6;
if (stream->pi.flags & TSMUX_PACKET_FLAG_PES_FULL_HEADER) {
/* For a PES 'full header' we have at least 3 more bytes,
* and then more based on flags */
packet_len += 3;
if (stream->pi.flags & TSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS) {
packet_len += 10;
} else if (stream->pi.flags & TSMUX_PACKET_FLAG_PES_WRITE_PTS) {
packet_len += 5;
}
if (stream->pi.flags & TSMUX_PACKET_FLAG_PES_EXT_STREAMID) {
/* Need basic extension flags (1 byte), plus 2 more bytes for the
* length + extended stream id */
packet_len += 3;
}
if (stream->pi.pes_header_length) {
/* check for consistency, then we can add stuffing */
g_assert (packet_len <= stream->pi.pes_header_length + 6 + 3);
packet_len = stream->pi.pes_header_length + 6 + 3;
}
}
return packet_len;
}
/* Find a PTS/DTS to write into the pes header within the next bound bytes
* of the data */
static void
tsmux_stream_find_pts_dts_within (TsMuxStream * stream, guint bound,
gint64 * pts, gint64 * dts)
{
GList *cur;
*pts = -1;
*dts = -1;
for (cur = stream->buffers; cur; cur = cur->next) {
TsMuxStreamBuffer *curbuf = cur->data;
/* FIXME: This isn't quite correct - if the 'bound' is within this
* buffer, we don't know if the timestamp is before or after the split
* so we shouldn't return it */
if (bound <= curbuf->size) {
*pts = curbuf->pts;
*dts = curbuf->dts;
return;
}
/* Have we found a buffer with pts/dts set? */
if (curbuf->pts != -1 || curbuf->dts != -1) {
*pts = curbuf->pts;
*dts = curbuf->dts;
return;
}
bound -= curbuf->size;
}
}
static void
tsmux_stream_write_pes_header (TsMuxStream * stream, guint8 * data)
{
guint16 length_to_write;
guint8 hdr_len = tsmux_stream_pes_header_length (stream);
guint8 *orig_data = data;
/* start_code prefix + stream_id + pes_packet_length = 6 bytes */
data[0] = 0x00;
data[1] = 0x00;
data[2] = 0x01;
data[3] = stream->id;
data += 4;
/* Write 2 byte PES packet length here. 0 (unbounded) is only
* valid for video packets */
if (stream->cur_pes_payload_size != 0) {
length_to_write = hdr_len + stream->cur_pes_payload_size - 6;
} else {
length_to_write = 0;
}
tsmux_put16 (&data, length_to_write);
if (stream->pi.flags & TSMUX_PACKET_FLAG_PES_FULL_HEADER) {
guint8 flags = 0;
/* Not scrambled, original, not-copyrighted, data_alignment not specified */
flags = 0x81;
if (stream->pi.flags & TSMUX_PACKET_FLAG_PES_DATA_ALIGNMENT)
flags |= 0x4;
*data++ = flags;
flags = 0;
/* Flags */
if (stream->pi.flags & TSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS)
flags |= 0xC0;
else if (stream->pi.flags & TSMUX_PACKET_FLAG_PES_WRITE_PTS)
flags |= 0x80;
if (stream->pi.flags & TSMUX_PACKET_FLAG_PES_EXT_STREAMID)
flags |= 0x01; /* Enable PES_extension_flag */
*data++ = flags;
/* Header length is the total pes length,
* minus the 9 bytes of start codes, flags + hdr_len */
g_return_if_fail (hdr_len >= 9);
*data++ = (hdr_len - 9);
if (stream->pi.flags & TSMUX_PACKET_FLAG_PES_WRITE_PTS_DTS) {
tsmux_put_ts (&data, 0x3, stream->pts);
tsmux_put_ts (&data, 0x1, stream->dts);
} else if (stream->pi.flags & TSMUX_PACKET_FLAG_PES_WRITE_PTS) {
tsmux_put_ts (&data, 0x2, stream->pts);
}
if (stream->pi.flags & TSMUX_PACKET_FLAG_PES_EXT_STREAMID) {
guint8 ext_len;
flags = 0x0f; /* (reserved bits) | PES_extension_flag_2 */
*data++ = flags;
ext_len = 1; /* Only writing 1 byte into the extended fields */
*data++ = 0x80 | ext_len;
/* Write the extended streamID */
*data++ = stream->id_extended;
}
/* write stuffing bytes if fixed PES header length requested */
if (stream->pi.pes_header_length)
while (data < orig_data + stream->pi.pes_header_length + 9)
*data++ = 0xff;
}
}
/**
* tsmux_stream_add_data:
* @stream: a #TsMuxStream
* @data: data to add
* @len: length of @data
* @user_data: user data to pass to release func
* @pts: PTS of access unit in @data
* @dts: DTS of access unit in @data
* @random_access: TRUE if random access point (keyframe)
*
* Submit @len bytes of @data into @stream. @pts and @dts can be set to the
* timestamp (against a 90Hz clock) of the first access unit in @data. A
* timestamp of -1 for @pts or @dts means unknown.
*
* @user_data will be passed to the release function as set with
* tsmux_stream_set_buffer_release_func() when @data can be freed.
*/
void
tsmux_stream_add_data (TsMuxStream * stream, guint8 * data, guint len,
void *user_data, gint64 pts, gint64 dts, gboolean random_access)
{
TsMuxStreamBuffer *packet;
g_return_if_fail (stream != NULL);
packet = g_slice_new (TsMuxStreamBuffer);
packet->data = data;
packet->size = len;
packet->user_data = user_data;
packet->random_access = random_access;
packet->pts = pts;
packet->dts = dts;
if (stream->bytes_avail == 0)
stream->last_pts = pts;
stream->bytes_avail += len;
stream->buffers = g_list_append (stream->buffers, packet);
}
/**
* tsmux_stream_get_es_descrs:
* @stream: a #TsMuxStream
* @buf: a buffer to hold the ES descriptor
* @len: the length used in @buf
*
* Write an Elementary Stream Descriptor for @stream into @buf. the number of
* bytes consumed in @buf will be updated in @len.
*
* @buf and @len must be at least #TSMUX_MIN_ES_DESC_LEN.
*/
void
tsmux_stream_get_es_descrs (TsMuxStream * stream, guint8 * buf, guint16 * len)
{
guint8 *pos;
g_return_if_fail (stream != NULL);
if (buf == NULL) {
if (len != NULL)
*len = 0;
return;
}
/* Based on the stream type, write out any descriptors to go in the
* PMT ES_info field */
pos = buf;
/* tag (registration_descriptor), length, format_identifier */
switch (stream->stream_type) {
case TSMUX_ST_AUDIO_AAC:
/* FIXME */
break;
case TSMUX_ST_VIDEO_MPEG4:
/* FIXME */
break;
case TSMUX_ST_VIDEO_H264:
*pos++ = 0x05;
*pos++ = 8;
*pos++ = 0x48; /* 'H' */
*pos++ = 0x44; /* 'D' */
*pos++ = 0x4D; /* 'M' */
*pos++ = 0x56; /* 'V' */
/* FIXME : Not sure about this additional_identification_info */
*pos++ = 0xFF;
*pos++ = 0x1B;
*pos++ = 0x44;
*pos++ = 0x3F;
break;
case TSMUX_ST_VIDEO_DIRAC:
*pos++ = 0x05;
*pos++ = 4;
*pos++ = 0x64; /* 'd' */
*pos++ = 0x72; /* 'r' */
*pos++ = 0x61; /* 'a' */
*pos++ = 0x63; /* 'c' */
break;
case TSMUX_ST_PS_AUDIO_AC3:
{
*pos++ = 0x05;
*pos++ = 4;
*pos++ = 0x41; /* 'A' */
*pos++ = 0x43; /* 'C' */
*pos++ = 0x2D; /* '-' */
*pos++ = 0x33; /* '3' */
/* audio_stream_descriptor () | ATSC A/52-2001 Annex A
*
* descriptor_tag 8 uimsbf
* descriptor_length 8 uimsbf
* sample_rate_code 3 bslbf
* bsid 5 bslbf
* bit_rate_code 6 bslbf
* surround_mode 2 bslbf
* bsmod 3 bslbf
* num_channels 4 bslbf
* full_svc 1 bslbf
* langcod 8 bslbf
* [...]
*/
*pos++ = 0x81;
*pos++ = 0x04;
/* 3 bits sample_rate_code, 5 bits hardcoded bsid (default ver 8) */
switch (stream->audio_sampling) {
case 48000:
*pos++ = 0x08;
break;
case 44100:
*pos++ = 0x28;
break;
case 32000:
*pos++ = 0x48;
break;
default:
*pos++ = 0xE8;
break; /* 48, 44.1 or 32 Khz */
}
/* 1 bit bit_rate_limit, 5 bits bit_rate_code, 2 bits suround_mode */
switch (stream->audio_bitrate) {
case 32:
*pos++ = 0x00 << 2;
break;
case 40:
*pos++ = 0x01 << 2;
break;
case 48:
*pos++ = 0x02 << 2;
break;
case 56:
*pos++ = 0x03 << 2;
break;
case 64:
*pos++ = 0x04 << 2;
break;
case 80:
*pos++ = 0x05 << 2;
break;
case 96:
*pos++ = 0x06 << 2;
break;
case 112:
*pos++ = 0x07 << 2;
break;
case 128:
*pos++ = 0x08 << 2;
break;
case 160:
*pos++ = 0x09 << 2;
break;
case 192:
*pos++ = 0x0A << 2;
break;
case 224:
*pos++ = 0x0B << 2;
break;
case 256:
*pos++ = 0x0C << 2;
break;
case 320:
*pos++ = 0x0D << 2;
break;
case 384:
*pos++ = 0x0E << 2;
break;
case 448:
*pos++ = 0x0F << 2;
break;
case 512:
*pos++ = 0x10 << 2;
break;
case 576:
*pos++ = 0x11 << 2;
break;
case 640:
*pos++ = 0x12 << 2;
break;
default:
*pos++ = 0x32 << 2;
break; /* 640 Kb/s upper limit */
}
/* 3 bits bsmod, 4 bits num_channels, 1 bit full_svc */
switch (stream->audio_channels) {
case 1:
*pos++ = 0x01 << 1;
break; /* 1/0 */
case 2:
*pos++ = 0x02 << 1;
break; /* 2/0 */
case 3:
*pos++ = 0x0A << 1;
break; /* <= 3 */
case 4:
*pos++ = 0x0B << 1;
break; /* <= 4 */
case 5:
*pos++ = 0x0C << 1;
break; /* <= 5 */
case 6:
default:
*pos++ = 0x0D << 1;
break; /* <= 6 */
}
*pos++ = 0x00;
break;
}
case TSMUX_ST_PS_AUDIO_DTS:
/* FIXME */
break;
case TSMUX_ST_PS_AUDIO_LPCM:
/* FIXME */
break;
case TSMUX_ST_PS_TELETEXT:
/* tag */
*pos++ = 0x56;
/* FIXME empty descriptor for now;
* should be provided by upstream in event or so ? */
*pos = 0;
break;
case TSMUX_ST_PS_DVB_SUBPICTURE:
/* falltrough ...
* that should never happen anyway as
* dvb subtitles are private data */
case TSMUX_ST_PRIVATE_DATA:
if (stream->is_dvb_sub) {
GST_DEBUG ("Stream language %s", stream->language);
*pos++ = 0x59; /* dvb subtitles */
*pos++ = 0x08; /* descriptor length */
*pos++ = stream->language[0]; /* Language */
*pos++ = stream->language[1];
*pos++ = stream->language[2];
*pos++ = 0x10; /* Simple DVB subtitles with no monitor aspect ratio critical
FIXME, how do we make it settable? */
*pos++ = 0x00; /* Default composition page ID */
*pos++ = 0x01;
*pos++ = 0x01; /* Default ancillary_page_id */
*pos++ = 0x52;
break;
}
default:
break;
}
if (len)
*len = (pos - buf);
}
/**
* tsmux_stream_pcr_ref:
* @stream: a #TsMuxStream
*
* Mark the stream as being used as the PCR for some program.
*/
void
tsmux_stream_pcr_ref (TsMuxStream * stream)
{
g_return_if_fail (stream != NULL);
stream->pcr_ref++;
}
/**
* tsmux_stream_pcr_unref:
* @stream: a #TsMuxStream
*
* Mark the stream as no longer being used as the PCR for some program.
*/
void
tsmux_stream_pcr_unref (TsMuxStream * stream)
{
g_return_if_fail (stream != NULL);
stream->pcr_ref--;
}
/**
* tsmux_stream_is_pcr:
* @stream: a #TsMuxStream
*
* Check if @stream is used as the PCR for some program.
*
* Returns: TRUE if the stream is in use as the PCR for some program.
*/
gboolean
tsmux_stream_is_pcr (TsMuxStream * stream)
{
return stream->pcr_ref != 0;
}
/**
* tsmux_stream_get_pts:
* @stream: a #TsMuxStream
*
* Return the PTS of the last buffer that has had bytes written and
* which _had_ a PTS in @stream.
*
* Returns: the PTS of the last buffer in @stream.
*/
guint64
tsmux_stream_get_pts (TsMuxStream * stream)
{
g_return_val_if_fail (stream != NULL, -1);
return stream->last_pts;
}
Reference in a new issue View git blame Copy permalink