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vlc/modules/packetizer/a52.c
Laurent Aimar 4dec9682f6 * all: new sout scheme. Now a chain of module are created that can 
modify/apply on all streams, --sout has the same behavour expect when
starting with a '#'.

 With a starting '#' you can specify a chain of modules, it's still
unstable but a lot more powerfull.
 You have access to duplicate(that duplicate all stream), transcode
(using only ffmpeg), standard/std and es (that apply muxers and access),
and display. You could chain them with ':' and specify options with
{option1=value,option2=value[,...]}.

ex: * to stream and see the stream to udp/ts:ip
 --sout '#duplicate{dst=display,dst=std{access=udp,mux=ts,url=ip}}'
    * to transcode,see and stream
 --sout '#transcode{acodec=mpga}:duplicate{dst=display,dst=std{access=udp,mux=ts,url=ip}}'

 Without a starting '#', the url is converted into '#std{acces=,mux=,url}'
Test and report bugs :)
2003-04-13 20:00:21 +00:00

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/*****************************************************************************
* a52.c
*****************************************************************************
* Copyright (C) 2001, 2002 VideoLAN
* $Id: a52.c,v 1.4 2003/04/13 20:00:21 fenrir Exp $
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
* Eric Petit <titer@videolan.org>
*
* 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, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <vlc/vlc.h>
#include <vlc/aout.h>
#include <vlc/decoder.h>
#include <vlc/input.h>
#include <vlc/sout.h>
#include <stdlib.h> /* malloc(), free() */
#include <string.h> /* strdup() */
#include "codecs.h" /* WAVEFORMATEX BITMAPINFOHEADER */
/*****************************************************************************
* Local prototypes
*****************************************************************************/
typedef struct packetizer_s
{
/* Input properties */
decoder_fifo_t *p_fifo;
bit_stream_t bit_stream;
/* Output properties */
sout_packetizer_input_t *p_sout_input;
sout_format_t output_format;
uint64_t i_samplescount;
mtime_t i_last_pts;
} packetizer_t;
static int Open ( vlc_object_t * );
static int Run ( decoder_fifo_t * );
static int InitThread ( packetizer_t * );
static void PacketizeThread ( packetizer_t * );
static void EndThread ( packetizer_t * );
static int SyncInfo( const byte_t *, int *, int *, int * );
#define FREE( p ) if( p ) free( p ); p = NULL
/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin();
set_description( _("A/52 audio packetizer") );
set_capability( "packetizer", 10 );
set_callbacks( Open, NULL );
vlc_module_end();
/*****************************************************************************
* OpenDecoder: probe the packetizer and return score
*****************************************************************************
* Tries to launch a decoder and return score so that the interface is able
* to choose.
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
if( p_fifo->i_fourcc != VLC_FOURCC( 'a', '5', '2', ' ') &&
p_fifo->i_fourcc != VLC_FOURCC( 'a', '5', '2', 'b') )
{
return VLC_EGENERIC;
}
p_fifo->pf_run = Run;
return VLC_SUCCESS;
}
/*****************************************************************************
* RunDecoder: this function is called just after the thread is created
*****************************************************************************/
static int Run( decoder_fifo_t *p_fifo )
{
packetizer_t *p_pack;
int b_error;
msg_Info( p_fifo, "Running A/52 packetizer" );
if( !( p_pack = malloc( sizeof( packetizer_t ) ) ) )
{
msg_Err( p_fifo, "out of memory" );
DecoderError( p_fifo );
return( -1 );
}
memset( p_pack, 0, sizeof( packetizer_t ) );
p_pack->p_fifo = p_fifo;
if( InitThread( p_pack ) != 0 )
{
DecoderError( p_fifo );
return( -1 );
}
while( ( !p_pack->p_fifo->b_die )&&( !p_pack->p_fifo->b_error ) )
{
PacketizeThread( p_pack );
}
if( ( b_error = p_pack->p_fifo->b_error ) )
{
DecoderError( p_pack->p_fifo );
}
EndThread( p_pack );
FREE( p_pack );
if( b_error )
{
return( -1 );
}
return( 0 );
}
/*****************************************************************************
* InitThread: initialize data before entering main loop
*****************************************************************************/
static int InitThread( packetizer_t *p_pack )
{
p_pack->output_format.i_cat = AUDIO_ES;
p_pack->output_format.i_fourcc = VLC_FOURCC( 'a', '5', '2', ' ' );
p_pack->p_sout_input = NULL;
p_pack->i_samplescount = 0;
p_pack->i_last_pts = 0;
if( InitBitstream( &p_pack->bit_stream, p_pack->p_fifo,
NULL, NULL ) != VLC_SUCCESS )
{
msg_Err( p_pack->p_fifo, "cannot initialize bitstream" );
return -1;
}
return( 0 );
}
/*****************************************************************************
* PacketizeThread: packetize an unit (here copy a complete pes)
*****************************************************************************/
static void PacketizeThread( packetizer_t *p_pack )
{
sout_buffer_t *p_sout_buffer;
uint8_t p_header[7];
int i_channels, i_samplerate, i_bitrate;
int i_framelength;
mtime_t i_pts;
/* search a valid start code */
for( ;; )
{
int i_skip = 0;
RealignBits( &p_pack->bit_stream );
while( ShowBits( &p_pack->bit_stream, 16 ) != 0x0b77 &&
!p_pack->p_fifo->b_die && !p_pack->p_fifo->b_error )
{
RemoveBits( &p_pack->bit_stream, 8 );
i_skip++;
}
if( i_skip )
{
msg_Warn( p_pack->p_fifo, "trashing %d bytes", i_skip );
}
if( p_pack->p_fifo->b_die || p_pack->p_fifo->b_error )
{
return;
}
/* Set the Presentation Time Stamp */
NextPTS( &p_pack->bit_stream, &i_pts, NULL );
GetChunk( &p_pack->bit_stream, p_header, 7 );
if( p_pack->p_fifo->b_die ) return;
/* Check if frame is valid and get frame info */
i_framelength = SyncInfo( p_header, &i_channels, &i_samplerate,
&i_bitrate );
if( !i_framelength )
{
msg_Warn( p_pack->p_fifo, "invalid header found" );
continue;
}
else
{
// msg_Dbg( p_pack->p_fifo, "frame length %d b", i_framelength );
break;
}
}
if( !p_pack->p_sout_input )
{
p_pack->output_format.i_sample_rate = i_samplerate;
p_pack->output_format.i_channels = i_channels;
p_pack->output_format.i_block_align = 0;
p_pack->output_format.i_bitrate = 0;
p_pack->output_format.i_extra_data = 0;
p_pack->output_format.p_extra_data = NULL;
p_pack->p_sout_input =
sout_InputNew( p_pack->p_fifo,
&p_pack->output_format );
if( !p_pack->p_sout_input )
{
msg_Err( p_pack->p_fifo,
"cannot add a new stream" );
p_pack->p_fifo->b_error = 1;
return;
}
msg_Info( p_pack->p_fifo,
"A/52 channels:%d samplerate:%d bitrate:%d",
i_channels, i_samplerate, i_bitrate );
}
if( i_pts <= 0 && p_pack->i_last_pts <= 0 )
{
msg_Dbg( p_pack->p_fifo, "need a starting pts" );
return;
}
/* fix pts */
if( i_pts <= 0 )
{
i_pts = p_pack->i_last_pts +
(uint64_t)1000000 *
(uint64_t)A52_FRAME_NB /
(uint64_t)i_samplerate;
}
p_pack->i_last_pts = i_pts;
p_sout_buffer =
sout_BufferNew( p_pack->p_sout_input->p_sout, i_framelength );
if( !p_sout_buffer )
{
p_pack->p_fifo->b_error = 1;
return;
}
memcpy( p_sout_buffer->p_buffer, p_header, 7 );
p_sout_buffer->i_bitrate = i_bitrate;
p_sout_buffer->i_pts =
p_sout_buffer->i_dts = i_pts;
p_sout_buffer->i_length =
(uint64_t)1000000 *
(uint64_t)A52_FRAME_NB /
(uint64_t)i_samplerate;
p_pack->i_samplescount += A52_FRAME_NB;
/* we are already aligned */
GetChunk( &p_pack->bit_stream,
p_sout_buffer->p_buffer + 7,
i_framelength - 7 );
sout_InputSendBuffer( p_pack->p_sout_input,
p_sout_buffer );
}
/*****************************************************************************
* EndThread : packetizer thread destruction
*****************************************************************************/
static void EndThread ( packetizer_t *p_pack)
{
if( p_pack->p_sout_input )
{
sout_InputDelete( p_pack->p_sout_input );
}
}
/*****************************************************************************
* SyncInfo: parse A52 sync info
*****************************************************************************
* This code is borrowed from liba52 by Aaron Holtzman & Michel Lespinasse,
* since we don't want to oblige S/PDIF people to use liba52 just to get
* their SyncInfo...
* fenrir: I've change it to report channels count
*****************************************************************************/
static int SyncInfo( const byte_t * p_buf, int * pi_channels,
int * pi_sample_rate, int * pi_bit_rate )
{
static const uint8_t halfrate[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3 };
static const int rate[] = { 32, 40, 48, 56, 64, 80, 96, 112,
128, 160, 192, 224, 256, 320, 384, 448,
512, 576, 640 };
static const uint8_t lfeon[8] = { 0x10, 0x10, 0x04, 0x04,
0x04, 0x01, 0x04, 0x01 };
int frmsizecod;
int bitrate;
int half;
int acmod;
if ((p_buf[0] != 0x0b) || (p_buf[1] != 0x77)) /* syncword */
return 0;
if (p_buf[5] >= 0x60) /* bsid >= 12 */
return 0;
half = halfrate[p_buf[5] >> 3];
/* acmod, dsurmod and lfeon */
acmod = p_buf[6] >> 5;
if ( (p_buf[6] & 0xf8) == 0x50 )
{
/* Dolby surround = stereo + Dolby */
/* *pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_DOLBYSTEREO;*/
*pi_channels = 2; /* FIXME ??? */
}
else switch ( acmod )
{
case 0x0:
/* Dual-mono = stereo + dual-mono */
// *pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
// | AOUT_CHAN_DUALMONO;
*pi_channels = 2; /* FIXME ??? */
break;
case 0x1:
/* Mono */
*pi_channels = 1;
break;
case 0x2:
/* Stereo */
*pi_channels = 2;
break;
case 0x3: /* 3F */
case 0x4: /* 2F1R */
*pi_channels = 3;
break;
case 0x5: /* 3F1R */
case 0x6: /* 2F2R */
*pi_channels = 4;
break;
case 0x7:
/* 3F2R */
*pi_channels = 5;
break;
default:
return 0;
}
if ( p_buf[6] & lfeon[acmod] ) *pi_channels += 1;//|= AOUT_CHAN_LFEA;
frmsizecod = p_buf[4] & 63;
if (frmsizecod >= 38)
return 0;
bitrate = rate [frmsizecod >> 1];
*pi_bit_rate = (bitrate * 1000) >> half;
switch (p_buf[4] & 0xc0) {
case 0:
*pi_sample_rate = 48000 >> half;
return 4 * bitrate;
case 0x40:
*pi_sample_rate = 44100 >> half;
return 2 * (320 * bitrate / 147 + (frmsizecod & 1));
case 0x80:
*pi_sample_rate = 32000 >> half;
return 6 * bitrate;
default:
return 0;
}
}
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