Commit 4cd852f3 authored by Laurent Aimar's avatar Laurent Aimar
Browse files

a52sys.c: completely rewritten a52 stream demuxer. Now you should be able

 to play such file.
parent aabedc34
/*****************************************************************************
* a52sys.c : A/52 input module for vlc
* a52.c : Raw a52 Stream input module for vlc
*****************************************************************************
* Copyright (C) 2001 VideoLAN
* $Id: a52sys.c,v 1.3 2003/05/05 22:23:34 gbazin Exp $
* $Id: a52sys.c,v 1.4 2003/08/01 00:04:28 fenrir Exp $
*
* Authors: Arnaud de Bossoreille de Ribou <bozo@via.ecp.fr>
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
*
* 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
......@@ -25,96 +25,189 @@
* Preamble
*****************************************************************************/
#include <stdlib.h> /* malloc(), free() */
#include <string.h> /* strdup() */
#include <errno.h>
#include <vlc/vlc.h>
#include <vlc/input.h>
#include <sys/types.h>
#include <ninput.h>
/*****************************************************************************
* Constants
* Module descriptor
*****************************************************************************/
#define A52_PACKET_SIZE 16384
#define MAX_PACKETS_IN_FIFO 3
static int Open ( vlc_object_t * );
static void Close ( vlc_object_t * );
vlc_module_begin();
set_description( _("A52 demuxer" ) );
set_capability( "demux", 100 );
set_callbacks( Open, Close );
add_shortcut( "a52" );
vlc_module_end();
/* TODO:
*
*/
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Init ( vlc_object_t * );
static int Demux ( input_thread_t * );
static int Demux ( input_thread_t * );
/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin();
set_description( _("A52 demuxer") );
set_capability( "demux", 155 );
set_callbacks( Init, NULL );
add_shortcut( "a52" );
vlc_module_end();
struct demux_sys_t
{
stream_t *s;
mtime_t i_time;
es_descriptor_t *p_es;
};
static inline int HeaderCheck( const uint8_t * p )
{
if( (p[0] != 0x0b) || (p[1] != 0x77) || /* syncword */
(p[5] >= 0x60) || /* bsid >= 12 */
(p[4] & 63) >= 38 || /* frmsizecod */
( (p[4] & 0xc0) != 0 && (p[4] & 0xc0) != 0x40 && (p[4] & 0xc0) != 0x80 ) )
{
return VLC_FALSE;
}
return VLC_TRUE;
}
static int HeaderInfo( const uint8_t * p,
int *pi_channels,
int *pi_sample_rate,
int *pi_frame_size );
/*****************************************************************************
* Init: initializes ES structures
* Open: initializes AAC demux structures
*****************************************************************************/
static int Init( vlc_object_t * p_this )
static int Open( vlc_object_t * p_this )
{
input_thread_t * p_input = (input_thread_t *)p_this;
es_descriptor_t * p_es;
byte_t * p_peek;
input_thread_t *p_input = (input_thread_t *)p_this;
demux_sys_t *p_sys;
int b_forced = VLC_FALSE;
uint8_t *p_peek;
/* Initialize access plug-in structures. */
if( p_input->i_mtu == 0 )
module_t *p_id3;
if( p_input->psz_demux && !strncmp( p_input->psz_demux, "a52", 3 ) )
{
/* Improve speed. */
p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
b_forced = VLC_TRUE;
}
if( p_input->psz_name )
{
int i_len = strlen( p_input->psz_name );
p_input->pf_demux = Demux;
p_input->pf_rewind = NULL;
if( i_len > 4 && !strcasecmp( &p_input->psz_name[i_len - 4], ".a52" ) )
{
b_forced = VLC_TRUE;
}
}
/* Have a peep at the show. */
if( input_Peek( p_input, &p_peek, 2 ) < 2 )
/* skip possible id3 header */
p_id3 = module_Need( p_input, "id3", NULL );
if ( p_id3 )
{
/* Stream shorter than 4 bytes... */
msg_Err( p_input, "cannot peek()" );
return( -1 );
module_Unneed( p_input, p_id3 );
}
if( *p_peek != 0x0b || *(p_peek + 1) != 0x77 )
/* see if it could be 52 */
if( !b_forced )
{
if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "a52", 3 ) )
if( input_Peek( p_input, &p_peek, 6 ) < 6 )
{
/* User forced */
msg_Err( p_input, "this doesn't look like an a52 stream, continuing" );
msg_Err( p_input, "cannot peek" );
return VLC_EGENERIC;
}
else
if( !HeaderCheck( p_peek ) )
{
msg_Warn( p_input, "a52 module discarded (no startcode)" );
return( -1 );
msg_Warn( p_input, "A52 module discarded" );
return VLC_EGENERIC;
}
}
if( input_InitStream( p_input, 0 ) == -1 )
p_input->pf_demux = Demux;
p_input->p_demux_data = p_sys = malloc( sizeof( demux_sys_t ) );
p_sys->i_time = 0;
if( ( p_sys->s = stream_OpenInput( p_input ) ) == NULL )
{
return( -1 );
msg_Err( p_input, "cannot create stream" );
goto error;
}
input_AddProgram( p_input, 0, 0 );
p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
if( stream_Peek( p_sys->s, &p_peek, 6 ) < 6 )
{
msg_Err( p_input, "cannot peek" );
goto error;
}
if( HeaderCheck( p_peek ) )
{
int i_channels, i_sample_rate, i_frame_size;
input_info_category_t * p_category;
HeaderInfo( p_peek, &i_channels, &i_sample_rate, &i_frame_size );
msg_Dbg( p_input,
"a52 channels=%d sample_rate=%d",
i_channels, i_sample_rate );
vlc_mutex_lock( &p_input->stream.stream_lock );
p_category = input_InfoCategory( p_input, _("A52") );
input_AddInfo( p_category, _("Input Type"), "A52" );
input_AddInfo( p_category, _("Channels"), "%d", i_channels );
input_AddInfo( p_category, _("Sample Rate"), "%dHz", i_sample_rate );
vlc_mutex_unlock( &p_input->stream.stream_lock );
}
vlc_mutex_lock( &p_input->stream.stream_lock );
p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xBD,
AUDIO_ES, NULL, 0 );
p_es->i_stream_id = 0xBD;
p_es->i_fourcc = VLC_FOURCC('a','5','2',' ');
input_SelectES( p_input, p_es );
p_input->stream.p_selected_area->i_tell = 0;
if( input_InitStream( p_input, 0 ) == -1)
{
vlc_mutex_unlock( &p_input->stream.stream_lock );
msg_Err( p_input, "cannot init stream" );
goto error;
}
if( input_AddProgram( p_input, 0, 0) == NULL )
{
vlc_mutex_unlock( &p_input->stream.stream_lock );
msg_Err( p_input, "cannot add program" );
goto error;
}
p_input->stream.pp_programs[0]->b_is_ok = 0;
p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
p_input->stream.i_mux_rate = 0 / 50;
p_sys->p_es = input_AddES( p_input,
p_input->stream.p_selected_program,
1 , AUDIO_ES, NULL, 0 );
p_sys->p_es->i_stream_id = 1;
p_sys->p_es->i_fourcc = VLC_FOURCC( 'a', '5', '2', ' ' );
input_SelectES( p_input, p_sys->p_es );
p_input->stream.p_selected_program->b_is_ok = 1;
vlc_mutex_unlock( &p_input->stream.stream_lock );
return( 0 );
return VLC_SUCCESS;
error:
if( p_sys->s )
{
stream_Release( p_sys->s );
}
free( p_sys );
return VLC_EGENERIC;
}
/*****************************************************************************
* Demux: reads and demuxes data packets
*****************************************************************************
......@@ -122,58 +215,169 @@ static int Init( vlc_object_t * p_this )
*****************************************************************************/
static int Demux( input_thread_t * p_input )
{
ssize_t i_read;
decoder_fifo_t * p_fifo =
p_input->stream.p_selected_program->pp_es[0]->p_decoder_fifo;
pes_packet_t * p_pes;
data_packet_t * p_data;
demux_sys_t *p_sys = p_input->p_demux_data;
pes_packet_t *p_pes;
if( p_fifo == NULL )
int i_channels, i_sample_rate, i_frame_size;
uint8_t *p_peek;
if( stream_Peek( p_sys->s, &p_peek, 6 ) < 6 )
{
return -1;
msg_Warn( p_input, "cannot peek" );
return 0;
}
i_read = input_SplitBuffer( p_input, &p_data, A52_PACKET_SIZE );
if( !HeaderCheck( p_peek ) )
{
/* we need to resynch */
vlc_bool_t b_ok = VLC_FALSE;
int i_skip = 0;
int i_peek;
i_peek = stream_Peek( p_sys->s, &p_peek, 8096 );
if( i_peek < 8 )
{
msg_Warn( p_input, "cannot peek" );
return 0;
}
while( i_peek >= 8 )
{
if( HeaderCheck( p_peek ) )
{
b_ok = VLC_TRUE;
break;
}
p_peek++;
i_peek--;
i_skip++;
}
msg_Warn( p_input, "garbage=%d bytes", i_skip );
stream_Read( p_sys->s, NULL, i_skip );
return 1;
}
if ( i_read <= 0 )
HeaderInfo( p_peek, &i_channels, &i_sample_rate, &i_frame_size );
input_ClockManageRef( p_input,
p_input->stream.p_selected_program,
p_sys->i_time * 9 / 100 );
if( ( p_pes = stream_PesPacket( p_sys->s, i_frame_size ) ) == NULL )
{
return i_read;
msg_Warn( p_input, "cannot read data" );
return 0;
}
p_pes = input_NewPES( p_input->p_method_data );
p_pes->i_dts =
p_pes->i_pts = input_ClockGetTS( p_input,
p_input->stream.p_selected_program,
p_sys->i_time * 9 / 100 );
if( p_pes == NULL )
if( !p_sys->p_es->p_decoder_fifo )
{
msg_Err( p_input, "out of memory" );
input_DeletePacket( p_input->p_method_data, p_data );
msg_Err( p_input, "no audio decoder" );
input_DeletePES( p_input->p_method_data, p_pes );
return( -1 );
}
p_pes->i_rate = p_input->stream.control.i_rate;
p_pes->p_first = p_pes->p_last = p_data;
p_pes->i_nb_data = 1;
input_DecodePES( p_sys->p_es->p_decoder_fifo, p_pes );
p_sys->i_time += (mtime_t)1000000 *
(mtime_t)1536 /
(mtime_t)i_sample_rate;
return( 1 );
}
/*****************************************************************************
* Close: frees unused data
*****************************************************************************/
static void Close( vlc_object_t * p_this )
{
input_thread_t *p_input = (input_thread_t*)p_this;
demux_sys_t *p_sys = p_input->p_demux_data;
vlc_mutex_lock( &p_fifo->data_lock );
if( p_fifo->i_depth >= MAX_PACKETS_IN_FIFO )
if( p_sys->s )
{
/* Wait for the decoder. */
vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
stream_Release( p_sys->s );
}
vlc_mutex_unlock( &p_fifo->data_lock );
free( p_sys );
}
if( (p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_REINIT)
|(p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_START)
| (input_ClockManageControl( p_input,
p_input->stream.p_selected_program,
(mtime_t)0 ) == PAUSE_S) )
/*****************************************************************************
* SyncInfo: parse A/52 sync info
*****************************************************************************
* This code is borrowed from liba52 by Aaron Holtzman & Michel Lespinasse,
*****************************************************************************/
static int HeaderInfo( const uint8_t * p,
int *pi_channels,
int *pi_sample_rate,
int *pi_frame_size )
{
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[0] != 0x0b) || (p[1] != 0x77)) /* syncword */
return VLC_FALSE;
if (p[5] >= 0x60) /* bsid >= 12 */
return VLC_FALSE;
half = halfrate[p[5] >> 3];
/* acmod, dsurmod and lfeon */
acmod = p[6] >> 5;
if ( (p[6] & 0xf8) == 0x50 )
{
msg_Warn( p_input, "synchro reinit" );
p_pes->i_pts = mdate() + DEFAULT_PTS_DELAY;
p_input->stream.p_selected_program->i_synchro_state = SYNCHRO_OK;
/* Dolby surround = stereo + Dolby */
*pi_channels = 2;
}
else
{
static const int acmod_to_channels[8] =
{
2 /* dual mono */, 1 /* mono */, 2 /* stereo */,
3 /* 3F */, 3 /* 2f1R */,
4 /* 3F1R */, 4, /* 2F2R */
5 /* 3F2R */
};
*pi_channels = acmod_to_channels[acmod];
}
input_DecodePES( p_fifo, p_pes );
if ( p[6] & lfeon[acmod] ) (*pi_channels)++; /* LFE */
return 1;
frmsizecod = p[4] & 63;
if (frmsizecod >= 38)
return VLC_FALSE;
bitrate = rate[frmsizecod >> 1];
switch (p[4] & 0xc0) {
case 0:
*pi_sample_rate = 48000 >> half;
*pi_frame_size = 4 * bitrate;
return VLC_TRUE;
case 0x40:
*pi_sample_rate = 44100 >> half;
*pi_frame_size = 2 * (320 * bitrate / 147 + (frmsizecod & 1));
return VLC_TRUE;
case 0x80:
*pi_sample_rate = 32000 >> half;
*pi_frame_size =6 * bitrate;
return VLC_TRUE;
default:
return VLC_FALSE;
}
}
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