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Commit 64cd4196 authored by Laurent Aimar's avatar Laurent Aimar
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Added support for eac3 in a52 packetizer.

parent abfaf31f
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Showing with 164 additions and 102 deletions
modules/codec/a52.c
View file @ 64cd4196
......@@ -36,12 +36,34 @@
#include <vlc_aout.h>
#include <vlc_input.h>
#include <vlc_block_helper.h>
#include <vlc_bits.h>
#define A52_HEADER_SIZE 7
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int OpenDecoder ( vlc_object_t * );
static int OpenPacketizer( vlc_object_t * );
static void CloseCommon ( vlc_object_t * );
vlc_module_begin();
set_description( N_("A/52 parser") );
set_capability( "decoder", 100 );
set_callbacks( OpenDecoder, CloseCommon );
set_category( CAT_INPUT );
set_subcategory( SUBCAT_INPUT_ACODEC );
add_submodule();
set_description( N_("A/52 audio packetizer") );
set_capability( "packetizer", 10 );
set_callbacks( OpenPacketizer, CloseCommon );
vlc_module_end();
/*****************************************************************************
* decoder_sys_t : decoder descriptor
*****************************************************************************/
#define A52_HEADER_SIZE 7
struct decoder_sys_t
{
/* Module mode */
......@@ -79,9 +101,6 @@ enum {
/****************************************************************************
* Local prototypes
****************************************************************************/
static int OpenDecoder ( vlc_object_t * );
static int OpenPacketizer( vlc_object_t * );
static void CloseDecoder ( vlc_object_t * );
static void *DecodeBlock ( decoder_t *, block_t ** );
static int SyncInfo ( const uint8_t *, unsigned int *, unsigned int *,
......@@ -92,32 +111,28 @@ static aout_buffer_t *GetAoutBuffer( decoder_t * );
static block_t *GetSoutBuffer( decoder_t * );
/*****************************************************************************
* Module descriptor
* OpenCommon: probe the decoder/packetizer and return score
*****************************************************************************/
vlc_module_begin();
set_description( N_("A/52 parser") );
set_capability( "decoder", 100 );
set_callbacks( OpenDecoder, CloseDecoder );
set_category( CAT_INPUT );
set_subcategory( SUBCAT_INPUT_ACODEC );
add_submodule();
set_description( N_("A/52 audio packetizer") );
set_capability( "packetizer", 10 );
set_callbacks( OpenPacketizer, CloseDecoder );
vlc_module_end();
/*****************************************************************************
* OpenDecoder: probe the decoder and return score
*****************************************************************************/
static int OpenDecoder( vlc_object_t *p_this )
static int OpenCommon( vlc_object_t *p_this, bool b_packetizer )
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys;
vlc_fourcc_t i_codec;
if( p_dec->fmt_in.i_codec != VLC_FOURCC('a','5','2',' ')
&& p_dec->fmt_in.i_codec != VLC_FOURCC('a','5','2','b') )
switch( p_dec->fmt_in.i_codec )
{
case VLC_FOURCC('a','5','2',' '):
case VLC_FOURCC('a','5','2','b'):
i_codec = VLC_FOURCC('a','5','2',' ');
break;
case VLC_FOURCC('e','a','c','3'):
/* XXX ugly hack, a52 does not support eac3 so no eac3 pass-through
* support */
if( !b_packetizer )
return VLC_EGENERIC;
i_codec = VLC_FOURCC('e','a','c','3');
break;
default:
return VLC_EGENERIC;
}
......@@ -127,7 +142,7 @@ static int OpenDecoder( vlc_object_t *p_this )
return VLC_ENOMEM;
/* Misc init */
p_sys->b_packetizer = false;
p_sys->b_packetizer = b_packetizer;
p_sys->i_state = STATE_NOSYNC;
aout_DateSet( &p_sys->end_date, 0 );
......@@ -136,27 +151,27 @@ static int OpenDecoder( vlc_object_t *p_this )
/* Set output properties */
p_dec->fmt_out.i_cat = AUDIO_ES;
p_dec->fmt_out.i_codec = VLC_FOURCC('a','5','2',' ');
p_dec->fmt_out.i_codec = i_codec;
p_dec->fmt_out.audio.i_rate = 0; /* So end_date gets initialized */
/* Set callback */
p_dec->pf_decode_audio = (aout_buffer_t *(*)(decoder_t *, block_t **))
DecodeBlock;
if( b_packetizer )
p_dec->pf_packetize = (block_t *(*)(decoder_t *, block_t **))
DecodeBlock;
else
p_dec->pf_decode_audio = (aout_buffer_t *(*)(decoder_t *, block_t **))
DecodeBlock;
return VLC_SUCCESS;
}
static int OpenPacketizer( vlc_object_t *p_this )
static int OpenDecoder( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
int i_ret = OpenDecoder( p_this );
if( i_ret == VLC_SUCCESS ) p_dec->p_sys->b_packetizer = true;
return OpenCommon( p_this, false );
}
return i_ret;
static int OpenPacketizer( vlc_object_t *p_this )
{
return OpenCommon( p_this, true );
}
/****************************************************************************
......@@ -325,9 +340,9 @@ static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
}
/*****************************************************************************
* CloseDecoder: clean up the decoder
* CloseCommon: clean up the decoder
*****************************************************************************/
static void CloseDecoder( vlc_object_t *p_this )
static void CloseCommon( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys = p_dec->p_sys;
......@@ -420,17 +435,36 @@ static block_t *GetSoutBuffer( decoder_t *p_dec )
return p_block;
}
/*****************************************************************************
* SyncInfo: parse A/52 sync info
*****************************************************************************
/* Tables */
static const struct
{
unsigned int i_count;
unsigned int i_configuration;
} p_acmod[8] = {
{ 2, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_DUALMONO }, /* Dual-channel 1+1 */
{ 1, AOUT_CHAN_CENTER }, /* Mono 1/0 */
{ 2, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT }, /* Stereo 2/0 */
{ 3, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER }, /* 3F 3/0 */
{ 3, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER }, /* 2F1R 2/1 */
{ 4, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
AOUT_CHAN_REARCENTER }, /* 3F1R 3/1 */
{ 5, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT }, /* 2F2R 2/2 */
{ 6, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT }, /* 3F2R 3/2 */
};
/**
* It parse AC3 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...
*****************************************************************************/
static int SyncInfo( const uint8_t * p_buf,
unsigned int * pi_channels,
unsigned int * pi_channels_conf,
unsigned int * pi_sample_rate, int * pi_bit_rate )
*/
static int SyncInfoAC3( const uint8_t *p_buf,
unsigned int *pi_channels,
unsigned int *pi_channels_conf,
unsigned 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,
......@@ -443,11 +477,7 @@ static int SyncInfo( const uint8_t * p_buf,
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 */
......@@ -459,56 +489,10 @@ static int SyncInfo( const uint8_t * p_buf,
*pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_DOLBYSTEREO;
}
else switch ( acmod )
else
{
case 0x0:
/* Dual-mono = stereo + dual-mono */
*pi_channels = 2;
*pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_DUALMONO;
break;
case 0x1:
/* Mono */
*pi_channels = 1;
*pi_channels_conf = AOUT_CHAN_CENTER;
break;
case 0x2:
/* Stereo */
*pi_channels = 2;
*pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
break;
case 0x3:
/* 3F */
*pi_channels = 3;
*pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_CENTER;
break;
case 0x4:
/* 2F1R */
*pi_channels = 3;
*pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_REARCENTER;
break;
case 0x5:
/* 3F1R */
*pi_channels = 4;
*pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
| AOUT_CHAN_REARCENTER;
break;
case 0x6:
/* 2F2R */
*pi_channels = 4;
*pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
break;
case 0x7:
/* 3F2R */
*pi_channels = 5;
*pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
break;
default:
return 0;
*pi_channels = p_acmod[acmod].i_count;
*pi_channels_conf = p_acmod[acmod].i_configuration;
}
if ( p_buf[6] & lfeon[acmod] )
......@@ -537,3 +521,81 @@ static int SyncInfo( const uint8_t * p_buf,
return 0;
}
}
/**
* It parse E-AC3 sync info
*/
static int SyncInfoEAC3( const uint8_t *p_buf,
unsigned int *pi_channels,
unsigned int *pi_channels_conf,
unsigned int *pi_sample_rate, int *pi_bit_rate )
{
static const int pi_samplerate[3] = { 48000, 44100, 32000 };
bs_t s;
int i_frame_size;
int i_fscod, i_fscod2;
int i_numblkscod;
int i_acmod, i_lfeon;
int i_bytes;
bs_init( &s, (void*)p_buf, A52_HEADER_SIZE );
bs_skip( &s, 16 + /* start code */
2 + /* stream type */
3 ); /* substream id */
i_frame_size = bs_read( &s, 11 );
if( i_frame_size < 2 )
return 0;
i_bytes = 2 * ( i_frame_size + 1 );
i_fscod = bs_read( &s, 2 );
if( i_fscod == 0x03 )
{
i_fscod2 = bs_read( &s, 2 );
if( i_fscod2 == 0X03 )
return 0;
*pi_sample_rate = pi_samplerate[i_fscod2] / 2;
i_numblkscod = 6;
}
else
{
static const int pi_blocks[4] = { 1, 2, 3, 6 };
*pi_sample_rate = pi_samplerate[i_fscod];
i_numblkscod = pi_blocks[bs_read( &s, 2 )];
}
i_acmod = bs_read( &s, 3 );
i_lfeon = bs_read1( &s );
*pi_channels = p_acmod[i_acmod].i_count + i_lfeon;
*pi_channels_conf = p_acmod[i_acmod].i_configuration | ( i_lfeon ? AOUT_CHAN_LFE : 0);
*pi_bit_rate = 8 * i_bytes * (*pi_sample_rate) / (i_numblkscod * 256);
return i_bytes;
}
static int SyncInfo( const uint8_t *p_buf,
unsigned int *pi_channels,
unsigned int *pi_channels_conf,
unsigned int *pi_sample_rate, int *pi_bit_rate )
{
int bsid;
/* Check synword */
if( p_buf[0] != 0x0b || p_buf[1] != 0x77 )
return 0;
/* Check bsid */
bsid = p_buf[5] >> 3;
if( bsid > 16 )
return 0;
if( bsid <= 10 )
return SyncInfoAC3( p_buf, pi_channels, pi_channels_conf,
pi_sample_rate, pi_bit_rate );
else
return SyncInfoEAC3( p_buf, pi_channels, pi_channels_conf,
pi_sample_rate, pi_bit_rate );
}
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