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vlc/modules/mux/mpeg/ps.c
Francois Cartegnie cea941e930 demux/mux: ps: map MPEG-H
2022-04-23 13:30:17 +00:00

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/*****************************************************************************
* ps.c: MPEG PS (ISO/IEC 13818-1) / MPEG SYSTEM (ISO/IEC 1172-1)
* multiplexer module for vlc
*****************************************************************************
* Copyright (C) 2001, 2002 VLC authors and VideoLAN
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
* Eric Petit <titer@videolan.org>
* Gildas Bazin <gbazin@videolan.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_sout.h>
#include <vlc_block.h>
#include "bits.h"
#include "pes.h"
#include "../../demux/mpeg/timestamps.h"
#include <vlc_iso_lang.h>
/*****************************************************************************
* Module descriptor
*****************************************************************************/
#define DTS_TEXT N_("DTS delay (ms)")
#define DTS_LONGTEXT N_("Delay the DTS (decoding time " \
"stamps) and PTS (presentation timestamps) of the data in the " \
"stream, compared to the SCRs. This allows for some buffering inside " \
"the client decoder.")
#define PES_SIZE_TEXT N_("PES maximum size")
#define PES_SIZE_LONGTEXT N_("Set the maximum allowed PES "\
"size when producing the MPEG PS streams.")
static int Open ( vlc_object_t * );
static void Close ( vlc_object_t * );
#define SOUT_CFG_PREFIX "sout-ps-"
vlc_module_begin ()
set_description( N_("PS muxer") )
set_shortname( "MPEG-PS" )
set_subcategory( SUBCAT_SOUT_MUX )
set_capability( "sout mux", 50 )
add_shortcut( "ps", "mpeg1", "dvd" )
set_callbacks( Open, Close )
add_integer( SOUT_CFG_PREFIX "dts-delay", 200, DTS_TEXT,
DTS_LONGTEXT )
add_integer( SOUT_CFG_PREFIX "pes-max-size", PES_PAYLOAD_SIZE_MAX,
PES_SIZE_TEXT, PES_SIZE_LONGTEXT )
vlc_module_end ()
/*****************************************************************************
* Exported prototypes
*****************************************************************************/
static int Control ( sout_mux_t *, int, va_list );
static int AddStream( sout_mux_t *, sout_input_t * );
static void DelStream( sout_mux_t *, sout_input_t * );
static int Mux ( sout_mux_t * );
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static void MuxWritePackHeader ( sout_mux_t *, block_t **, vlc_tick_t );
static void MuxWriteSystemHeader( sout_mux_t *, block_t **, vlc_tick_t );
static void MuxWritePSM ( sout_mux_t *, block_t **, vlc_tick_t );
static void StreamIdInit ( bool *id, int i_range );
static int StreamIdGet ( bool *id, int i_id_min, int i_id_max );
static void StreamIdRelease ( bool *id, int i_id_min, int i_id );
typedef struct ps_stream_s
{
int i_stream_id;
int i_stream_type;
int i_max_buff_size; /* used in system header */
/* Language is iso639-2T */
uint8_t lang[3];
vlc_tick_t i_dts;
} ps_stream_t;
typedef struct
{
/* Which id are unused */
bool stream_id_mpga[16]; /* 0xc0 -> 0xcf */
bool stream_id_mpgv[16]; /* 0xe0 -> 0xef */
bool stream_id_a52[8]; /* 0x80 -> 0x87 <- FIXME I'm not sure */
bool stream_id_spu[32]; /* 0x20 -> 0x3f */
bool stream_id_dts[8]; /* 0x88 -> 0x8f */
bool stream_id_lpcm[16]; /* 0xa0 -> 0xaf */
int i_audio_bound;
int i_video_bound;
int i_pes_count;
int i_system_header;
vlc_tick_t i_dts_delay;
int i_rate_bound; /* units of 50 bytes/second */
int64_t i_instant_bitrate;
int64_t i_instant_size;
vlc_tick_t i_instant_dts;
bool b_mpeg2;
int i_pes_max_size;
int i_psm_version;
uint32_t crc32_table[256];
} sout_mux_sys_t;
static const char *const ppsz_sout_options[] = {
"dts-delay", "pes-max-size", NULL
};
/*****************************************************************************
* Open:
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
sout_mux_t *p_mux = (sout_mux_t*)p_this;
sout_mux_sys_t *p_sys;
vlc_value_t val;
msg_Info( p_mux, "Open" );
config_ChainParse( p_mux, SOUT_CFG_PREFIX, ppsz_sout_options, p_mux->p_cfg );
p_mux->pf_control = Control;
p_mux->pf_addstream = AddStream;
p_mux->pf_delstream = DelStream;
p_mux->pf_mux = Mux;
p_mux->p_sys = p_sys = malloc( sizeof( sout_mux_sys_t ) );
/* Init free stream id */
StreamIdInit( p_sys->stream_id_a52, 8 );
StreamIdInit( p_sys->stream_id_dts, 8 );
StreamIdInit( p_sys->stream_id_mpga, 16 );
StreamIdInit( p_sys->stream_id_mpgv, 16 );
StreamIdInit( p_sys->stream_id_lpcm, 16 );
StreamIdInit( p_sys->stream_id_spu, 32 );
p_sys->i_audio_bound = 0;
p_sys->i_video_bound = 0;
p_sys->i_system_header = 0;
p_sys->i_pes_count = 0;
p_sys->i_psm_version = 0;
p_sys->i_instant_bitrate = 0;
p_sys->i_instant_size = 0;
p_sys->i_instant_dts = 0;
p_sys->i_rate_bound = 0;
p_sys->b_mpeg2 = !(p_mux->psz_mux && !strcmp( p_mux->psz_mux, "mpeg1" ));
var_Get( p_mux, SOUT_CFG_PREFIX "dts-delay", &val );
p_sys->i_dts_delay = VLC_TICK_FROM_MS(val.i_int);
var_Get( p_mux, SOUT_CFG_PREFIX "pes-max-size", &val );
p_sys->i_pes_max_size = (int64_t)val.i_int;
/* Initialise CRC32 table */
if( p_sys->b_mpeg2 )
{
uint32_t i, j, k;
for( i = 0; i < 256; i++ )
{
k = 0;
for( j = (i << 24) | 0x800000; j != 0x80000000; j <<= 1 )
k = (k << 1) ^ (((k ^ j) & 0x80000000) ? 0x04c11db7 : 0);
p_sys->crc32_table[i] = k;
}
}
return VLC_SUCCESS;
}
/*****************************************************************************
* Close:
*****************************************************************************/
static void Close( vlc_object_t * p_this )
{
sout_mux_t *p_mux = (sout_mux_t*)p_this;
sout_mux_sys_t *p_sys = p_mux->p_sys;
block_t *p_end;
msg_Info( p_mux, "Close" );
p_end = block_Alloc( 4 );
if( p_end )
{
p_end->p_buffer[0] = 0x00; p_end->p_buffer[1] = 0x00;
p_end->p_buffer[2] = 0x01; p_end->p_buffer[3] = 0xb9;
sout_AccessOutWrite( p_mux->p_access, p_end );
}
free( p_sys );
}
/*****************************************************************************
* Control:
*****************************************************************************/
static int Control( sout_mux_t *p_mux, int i_query, va_list args )
{
VLC_UNUSED(p_mux);
bool *pb_bool;
char **ppsz;
switch( i_query )
{
case MUX_CAN_ADD_STREAM_WHILE_MUXING:
pb_bool = va_arg( args, bool * );
*pb_bool = true;
return VLC_SUCCESS;
case MUX_GET_MIME:
ppsz = va_arg( args, char ** );
*ppsz = strdup( "video/mpeg" );
return VLC_SUCCESS;
default:
return VLC_EGENERIC;
}
}
/*****************************************************************************
* AddStream:
*****************************************************************************/
static int AddStream( sout_mux_t *p_mux, sout_input_t *p_input )
{
sout_mux_sys_t *p_sys = p_mux->p_sys;
ps_stream_t *p_stream;
msg_Dbg( p_mux, "adding input codec=%4.4s",
(char*)&p_input->p_fmt->i_codec );
p_input->p_sys = p_stream = malloc( sizeof( ps_stream_t ) );
if( unlikely(p_input->p_sys == NULL) )
return VLC_ENOMEM;
p_stream->i_stream_type = 0x81;
p_stream->i_dts = -1;
/* Init this new stream */
switch( p_input->p_fmt->i_codec )
{
case VLC_CODEC_MPGV:
case VLC_CODEC_MP2V:
case VLC_CODEC_MP1V:
p_stream->i_stream_id =
StreamIdGet( p_sys->stream_id_mpgv, 0xe0, 0xef );
p_stream->i_stream_type = 0x02; /* ISO/IEC 13818 Video */
break;
case VLC_CODEC_MP4V:
p_stream->i_stream_id =
StreamIdGet( p_sys->stream_id_mpgv, 0xe0, 0xef );
p_stream->i_stream_type = 0x10;
break;
case VLC_CODEC_H264:
p_stream->i_stream_id =
StreamIdGet( p_sys->stream_id_mpgv, 0xe0, 0xef );
p_stream->i_stream_type = 0x1b;
break;
case VLC_CODEC_HEVC:
p_stream->i_stream_id =
StreamIdGet( p_sys->stream_id_mpgv, 0xe0, 0xef );
p_stream->i_stream_type = 0x24;
break;
case VLC_CODEC_DVD_LPCM:
p_stream->i_stream_id =
0xbd00 | StreamIdGet( p_sys->stream_id_lpcm, 0xa0, 0xaf );
break;
case VLC_CODEC_DTS:
p_stream->i_stream_id =
0xbd00 | StreamIdGet( p_sys->stream_id_dts, 0x88, 0x8f );
break;
case VLC_CODEC_A52:
p_stream->i_stream_id =
0xbd00 | StreamIdGet( p_sys->stream_id_a52, 0x80, 0x87 );
break;
case VLC_CODEC_MPGA:
p_stream->i_stream_id =
StreamIdGet( p_sys->stream_id_mpga, 0xc0, 0xcf );
p_stream->i_stream_type = 0x03; /* ISO/IEC 11172 Audio */
break;
case VLC_CODEC_MP4A:
if( p_input->p_fmt->i_original_fourcc == VLC_FOURCC('A','D','T','S') )
{
p_stream->i_stream_type = 0x0f; /* ISO/IEC 13818-7 */
}
else if( p_input->p_fmt->i_original_fourcc == VLC_FOURCC('L','A','T','M') )
{
p_stream->i_stream_type = 0x11; /* ISO/IEC 14496-3 */
}
else
goto error;
p_stream->i_stream_id =
StreamIdGet( p_sys->stream_id_mpga, 0xc0, 0xcf );
break;
case VLC_CODEC_MPEGH:
p_stream->i_stream_id =
StreamIdGet( p_sys->stream_id_mpga, 0xc0, 0xcf );
p_stream->i_stream_type = 0x2d; /* ISO/IEC 23008-3 Main */
break;
case VLC_CODEC_SPU:
p_stream->i_stream_id =
0xbd00 | StreamIdGet( p_sys->stream_id_spu, 0x20, 0x3f );
break;
default:
goto error;
}
if( p_stream->i_stream_id < 0 ) goto error;
if( p_input->p_fmt->i_cat == AUDIO_ES )
{
p_sys->i_audio_bound++;
p_stream->i_max_buff_size = 4 * 1024;
}
else if( p_input->p_fmt->i_cat == VIDEO_ES )
{
p_sys->i_video_bound++;
p_stream->i_max_buff_size = 400 * 1024; /* FIXME -- VCD uses 46, SVCD
uses 230, ffmpeg has 230 with a note that it is small */
}
else
{ /* FIXME -- what's valid for not audio or video? */
p_stream->i_max_buff_size = 4 * 1024;
}
/* Try to set a sensible default value for the instant bitrate */
p_sys->i_instant_bitrate += p_input->p_fmt->i_bitrate + 1000/* overhead */;
/* FIXME -- spec requires an upper limit rate boundary in the system header;
our codecs are VBR; using 2x nominal rate, convert to 50 bytes/sec */
p_sys->i_rate_bound += p_input->p_fmt->i_bitrate * 2 / (8 * 50);
p_sys->i_psm_version++;
p_stream->lang[0] = p_stream->lang[1] = p_stream->lang[2] = 0;
if( p_input->p_fmt->psz_language )
{
char *psz = p_input->p_fmt->psz_language;
const iso639_lang_t *pl = vlc_find_iso639( psz, false );
if( pl )
{
p_stream->lang[0] = pl->psz_iso639_2T[0];
p_stream->lang[1] = pl->psz_iso639_2T[1];
p_stream->lang[2] = pl->psz_iso639_2T[2];
msg_Dbg( p_mux, " - lang=%3.3s", pl->psz_iso639_2T );
}
}
return VLC_SUCCESS;
error:
free( p_stream );
return VLC_EGENERIC;
}
/*****************************************************************************
* DelStream:
*****************************************************************************/
static void DelStream( sout_mux_t *p_mux, sout_input_t *p_input )
{
sout_mux_sys_t *p_sys = p_mux->p_sys;
ps_stream_t *p_stream =(ps_stream_t*)p_input->p_sys;
msg_Dbg( p_mux, "removing input" );
switch( p_input->p_fmt->i_codec )
{
case VLC_CODEC_MPGV:
StreamIdRelease( p_sys->stream_id_mpgv, 0xe0,
p_stream->i_stream_id );
break;
case VLC_CODEC_DVD_LPCM:
StreamIdRelease( p_sys->stream_id_lpcm, 0xa0,
p_stream->i_stream_id&0xff );
break;
case VLC_CODEC_DTS:
StreamIdRelease( p_sys->stream_id_dts, 0x88,
p_stream->i_stream_id&0xff );
break;
case VLC_CODEC_A52:
StreamIdRelease( p_sys->stream_id_a52, 0x80,
p_stream->i_stream_id&0xff );
break;
case VLC_CODEC_MPGA:
StreamIdRelease( p_sys->stream_id_mpga, 0xc0,
p_stream->i_stream_id );
break;
case VLC_CODEC_SPU:
StreamIdRelease( p_sys->stream_id_spu, 0x20,
p_stream->i_stream_id&0xff );
break;
default:
/* Never reached */
break;
}
if( p_input->p_fmt->i_cat == AUDIO_ES )
{
p_sys->i_audio_bound--;
}
else if( p_input->p_fmt->i_cat == VIDEO_ES )
{
p_sys->i_video_bound--;
}
/* Try to set a sensible default value for the instant bitrate */
p_sys->i_instant_bitrate -= (p_input->p_fmt->i_bitrate + 1000);
/* rate_bound is in units of 50 bytes/second */
p_sys->i_rate_bound -= (p_input->p_fmt->i_bitrate * 2)/(8 * 50);
p_sys->i_psm_version++;
free( p_stream );
}
/*****************************************************************************
* Mux: Call each time there is new data for at least one stream
*****************************************************************************/
static int Mux( sout_mux_t *p_mux )
{
sout_mux_sys_t *p_sys = p_mux->p_sys;
for( ;; )
{
sout_input_t *p_input;
ps_stream_t *p_stream;
block_t *p_ps, *p_data;
vlc_tick_t i_dts;
/* Choose which stream to mux */
int i_stream = sout_MuxGetStream( p_mux, 1, &i_dts );
if( i_stream < 0 )
{
return VLC_SUCCESS;
}
p_input = p_mux->pp_inputs[i_stream];
p_stream = (ps_stream_t*)p_input->p_sys;
p_ps = NULL;
p_stream->i_dts = i_dts;
/* Write regulary PackHeader */
if( p_sys->i_pes_count % 30 == 0)
{
vlc_tick_t i_mindts = VLC_TICK_MAX;
for( int i=0; i < p_mux->i_nb_inputs; i++ )
{
ps_stream_t *p_s = (ps_stream_t*)p_input->p_sys;
if( p_input->p_fmt->i_cat == SPU_ES && p_mux->i_nb_inputs > 1 )
continue;
if( p_s->i_dts >= 0 && i_mindts > p_s->i_dts )
i_mindts = p_s->i_dts;
}
if( i_mindts != VLC_TICK_MAX && i_mindts > p_sys->i_instant_dts )
{
/* Update the instant bitrate every second or so */
if( p_sys->i_instant_size &&
i_dts - p_sys->i_instant_dts > VLC_TICK_FROM_SEC(1))
{
int64_t i_instant_bitrate = p_sys->i_instant_size * 8 * CLOCK_FREQ /
( i_dts - p_sys->i_instant_dts );
p_sys->i_instant_bitrate += i_instant_bitrate;
p_sys->i_instant_bitrate /= 2;
p_sys->i_instant_size = 0;
p_sys->i_instant_dts = i_dts;
}
else if( !p_sys->i_instant_size )
{
p_sys->i_instant_dts = i_dts;
}
MuxWritePackHeader( p_mux, &p_ps, i_dts );
}
}
/* Write regulary SystemHeader */
if( p_sys->i_pes_count % 300 == 0 )
{
block_t *p_pk;
MuxWriteSystemHeader( p_mux, &p_ps, i_dts );
/* For MPEG1 streaming, set HEADER flag */
for( p_pk = p_ps; p_pk != NULL; p_pk = p_pk->p_next )
{
p_pk->i_flags |= BLOCK_FLAG_HEADER;
}
}
/* Write regulary ProgramStreamMap */
if( p_sys->b_mpeg2 && p_sys->i_pes_count % 300 == 0 )
{
MuxWritePSM( p_mux, &p_ps, i_dts );
}
/* Get and mux a packet */
p_data = block_FifoGet( p_input->p_fifo );
EStoPES ( &p_data, p_input->p_fmt, p_stream->i_stream_id,
p_sys->b_mpeg2, 0, 0, p_sys->i_pes_max_size, 0 );
block_ChainAppend( &p_ps, p_data );
/* Get size of output data so we can calculate the instant bitrate */
for( p_data = p_ps; p_data; p_data = p_data->p_next )
{
p_sys->i_instant_size += p_data->i_buffer;
}
sout_AccessOutWrite( p_mux->p_access, p_ps );
/* Increase counter */
p_sys->i_pes_count++;
}
return VLC_SUCCESS;
}
/*****************************************************************************
*
*****************************************************************************/
static void StreamIdInit( bool *id, int i_range )
{
int i;
for( i = 0; i < i_range; i++ )
{
id[i] = true;
}
}
static int StreamIdGet( bool *id, int i_id_min, int i_id_max )
{
int i;
for( i = 0; i <= i_id_max - i_id_min; i++ )
{
if( id[i] )
{
id[i] = false;
return i_id_min + i;
}
}
return -1;
}
static void StreamIdRelease( bool *id, int i_id_min, int i_id )
{
id[i_id - i_id_min] = true;
}
static void MuxWritePackHeader( sout_mux_t *p_mux, block_t **p_buf,
vlc_tick_t i_dts )
{
sout_mux_sys_t *p_sys = p_mux->p_sys;
bits_buffer_t bits;
block_t *p_hdr;
int64_t i_scr;
int i_mux_rate;
i_scr = TO_SCALE_NZ(i_dts - p_sys->i_dts_delay);
p_hdr = block_Alloc( 18 );
if( !p_hdr )
return;
p_hdr->i_pts = p_hdr->i_dts = i_dts;
bits_initwrite( &bits, 14, p_hdr->p_buffer );
bits_write( &bits, 32, 0x01ba );
/* The spec specifies that the mux rate must be rounded upwards */
i_mux_rate = (p_sys->i_instant_bitrate + 8 * 50 - 1 ) / (8 * 50);
if( p_sys->b_mpeg2 )
{
bits_write( &bits, 2, 0x01 );
}
else
{
bits_write( &bits, 4, 0x02 );
}
bits_write( &bits, 3, ( i_scr >> 30 )&0x07 );
bits_write( &bits, 1, 1 ); // marker
bits_write( &bits, 15, ( i_scr >> 15 )&0x7fff );
bits_write( &bits, 1, 1 ); // marker
bits_write( &bits, 15, i_scr&0x7fff );
bits_write( &bits, 1, 1 ); // marker
if( p_sys->b_mpeg2 )
{
bits_write( &bits, 9, 0 ); // src extension
}
bits_write( &bits, 1, 1 ); // marker
bits_write( &bits, 22, i_mux_rate);
bits_write( &bits, 1, 1 ); // marker
if( p_sys->b_mpeg2 )
{
bits_write( &bits, 1, 1 ); // marker
bits_write( &bits, 5, 0x1f ); // reserved
bits_write( &bits, 3, 0 ); // stuffing bytes
}
p_hdr->i_buffer = p_sys->b_mpeg2 ? 14: 12;
block_ChainAppend( p_buf, p_hdr );
}
static void MuxWriteSystemHeader( sout_mux_t *p_mux, block_t **p_buf,
vlc_tick_t i_dts )
{
sout_mux_sys_t *p_sys = p_mux->p_sys;
block_t *p_hdr;
bits_buffer_t bits;
bool b_private;
int i_rate_bound;
int i_nb_private, i_nb_stream;
int i;
/* Count the number of private stream */
for( i = 0, i_nb_private = 0; i < p_mux->i_nb_inputs; i++ )
{
ps_stream_t *p_stream;
p_stream = (ps_stream_t*)p_mux->pp_inputs[i]->p_sys;
if( ( p_stream->i_stream_id&0xff00 ) == 0xbd00 )
{
i_nb_private++;
}
}
/* Private stream are declared only one time */
i_nb_stream = p_mux->i_nb_inputs -
( i_nb_private > 0 ? i_nb_private - 1 : 0 );
p_hdr = block_Alloc( 12 + i_nb_stream * 3 );
if( !p_hdr )
return;
p_hdr->i_dts = p_hdr->i_pts = i_dts;
/* The spec specifies that the reported rate_bound must be upper limit */
i_rate_bound = (p_sys->i_rate_bound);
bits_initwrite( &bits, 12 + i_nb_stream * 3, p_hdr->p_buffer );
bits_write( &bits, 32, 0x01bb );
bits_write( &bits, 16, 12 - 6 + i_nb_stream * 3 );
bits_write( &bits, 1, 1 ); // marker bit
bits_write( &bits, 22, i_rate_bound);
bits_write( &bits, 1, 1 ); // marker bit
bits_write( &bits, 6, p_sys->i_audio_bound );
bits_write( &bits, 1, 0 ); // fixed flag
bits_write( &bits, 1, 0 ); // CSPS flag
bits_write( &bits, 1, 0 ); // system audio lock flag
bits_write( &bits, 1, 0 ); // system video lock flag
bits_write( &bits, 1, 1 ); // marker bit
bits_write( &bits, 5, p_sys->i_video_bound );
bits_write( &bits, 1, 1 ); // packet rate restriction flag (1 for mpeg1)
bits_write( &bits, 7, 0xff ); // reserved bits
/* stream_id table */
for( i = 0, b_private = false; i < p_mux->i_nb_inputs; i++ )
{
sout_input_t *p_input;
ps_stream_t *p_stream;
p_input = p_mux->pp_inputs[i];
p_stream = (ps_stream_t *)p_input->p_sys;
if( ( p_stream->i_stream_id&0xff00 ) == 0xbd00 )
{
if( b_private )
{
continue;
}
b_private = true;
/* Write stream id */
bits_write( &bits, 8, 0xbd );
}
else
{
/* Write stream id */
bits_write( &bits, 8, p_stream->i_stream_id&0xff );
}
bits_write( &bits, 2, 0x03 ); /* reserved */
if( p_input->p_fmt->i_cat == AUDIO_ES )
{
bits_write( &bits, 1, 0 );
bits_write( &bits, 13, p_stream->i_max_buff_size / 128 );
}
else if( p_input->p_fmt->i_cat == VIDEO_ES )
{
bits_write( &bits, 1, 1 );
bits_write( &bits, 13, p_stream->i_max_buff_size / 1024);
}
else
{
/* FIXME -- the scale of 0 means do a /128 */
bits_write( &bits, 1, 0 );
bits_write( &bits, 13, p_stream->i_max_buff_size / 128 );
}
}
block_ChainAppend( p_buf, p_hdr );
}
static void MuxWritePSM( sout_mux_t *p_mux, block_t **p_buf, vlc_tick_t i_dts )
{
sout_mux_sys_t *p_sys = p_mux->p_sys;
block_t *p_hdr;
bits_buffer_t bits;
int i, i_psm_size = 16, i_es_map_size = 0;
for( i = 0; i < p_mux->i_nb_inputs; i++ )
{
sout_input_t *p_input = p_mux->pp_inputs[i];
ps_stream_t *p_stream = p_input->p_sys;
i_es_map_size += 4;
if( p_stream->lang[0] != 0 ) i_es_map_size += 6;
}
i_psm_size += i_es_map_size;
p_hdr = block_Alloc( i_psm_size );
if( !p_hdr )
return;
p_hdr->i_dts = p_hdr->i_pts = i_dts;
memset( p_hdr->p_buffer, 0, p_hdr->i_buffer );
bits_initwrite( &bits, i_psm_size, p_hdr->p_buffer );
bits_write( &bits, 32, 0x01bc );
bits_write( &bits, 16, i_psm_size - 6 );
bits_write( &bits, 1, 1 ); /* current_next_indicator */
bits_write( &bits, 2, 0xF ); /* reserved */
bits_write( &bits, 5, p_sys->i_psm_version );
bits_write( &bits, 7, 0xFF ); /* reserved */
bits_write( &bits, 1, 1 ); /* marker */
bits_write( &bits, 16, 0 ); /* program_stream_info_length */
/* empty */
bits_write( &bits, 16, i_es_map_size ); /* elementary_stream_map_length */
for( i = 0; i < p_mux->i_nb_inputs; i++ )
{
sout_input_t *p_input = p_mux->pp_inputs[i];
ps_stream_t *p_stream = p_input->p_sys;
bits_write( &bits, 8, p_stream->i_stream_type ); /* stream_type */
bits_write( &bits, 8, p_stream->i_stream_id ); /* elementary_stream_id */
/* ISO639 language descriptor */
if( p_stream->lang[0] != 0 )
{
bits_write( &bits, 16, 6 ); /* elementary_stream_info_length */
bits_write( &bits, 8, 0x0a ); /* descriptor_tag */
bits_write( &bits, 8, 4 ); /* descriptor_length */
bits_write( &bits, 8, p_stream->lang[0] );
bits_write( &bits, 8, p_stream->lang[1] );
bits_write( &bits, 8, p_stream->lang[2] );
bits_write( &bits, 8, 0 ); /* audio type: 0x00 undefined */
}
else
{
bits_write( &bits, 16, 0 ); /* elementary_stream_info_length */
}
}
/* CRC32 */
{
uint32_t i_crc = 0xffffffff;
for( i = 0; (size_t)i < p_hdr->i_buffer; i++ )
i_crc = (i_crc << 8) ^
p_sys->crc32_table[((i_crc >> 24) ^ p_hdr->p_buffer[i]) & 0xff];
bits_write( &bits, 32, i_crc );
}
block_ChainAppend( p_buf, p_hdr );
}
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