* a52.c: A/52 basic parser
*****************************************************************************
* Copyright (C) 2001-2002 VideoLAN
- * $Id: a52.c,v 1.17 2002/10/28 22:23:23 gbazin Exp $
+ * $Id: a52.c,v 1.18 2002/11/14 22:38:47 massiot Exp $
*
* Authors: Stéphane Borel <stef@via.ecp.fr>
* Christophe Massiot <massiot@via.ecp.fr>
# include <unistd.h>
#endif
-#define A52_FRAME_NB 1536
-
/*****************************************************************************
* dec_thread_t : A52 pass-through thread descriptor
*****************************************************************************/
/* decoder thread's main loop */
while ( !p_dec->p_fifo->b_die && !p_dec->p_fifo->b_error )
{
- int i_frame_size, i_channels, i_rate, i_bit_rate;
+ int i_frame_size, i_original_channels, i_rate, i_bit_rate;
mtime_t pts;
byte_t p_header[7];
aout_buffer_t * p_buffer;
if( p_dec->p_fifo->b_die ) break;
/* Check if frame is valid and get frame info */
- i_frame_size = SyncInfo( p_header, &i_channels, &i_rate,
+ i_frame_size = SyncInfo( p_header, &i_original_channels, &i_rate,
&i_bit_rate );
if( !i_frame_size )
if( (p_dec->p_aout_input != NULL) &&
( (p_dec->output_format.i_rate != i_rate)
- || (p_dec->output_format.i_channels != i_channels)
+ || (p_dec->output_format.i_original_channels
+ != i_original_channels)
|| (p_dec->output_format.i_bytes_per_frame != i_frame_size) ) )
{
/* Parameters changed - this should not happen. */
if( p_dec->p_aout_input == NULL )
{
p_dec->output_format.i_rate = i_rate;
- p_dec->output_format.i_channels = i_channels;
+ p_dec->output_format.i_original_channels = i_original_channels;
+ p_dec->output_format.i_physical_channels
+ = i_original_channels & AOUT_CHAN_PHYSMASK;
p_dec->output_format.i_bytes_per_frame = i_frame_size;
p_dec->output_format.i_frame_length = A52_FRAME_NB;
aout_DateInit( &end_date, i_rate );
free( p_dec );
}
-/****************************************************************************
+/*****************************************************************************
* 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...
- ****************************************************************************/
+ *****************************************************************************/
int SyncInfo( const byte_t * p_buf, int * pi_channels, int * pi_sample_rate,
int * pi_bit_rate)
{
acmod = p_buf[6] >> 5;
if ( (p_buf[6] & 0xf8) == 0x50 )
{
- *pi_channels = AOUT_CHAN_DOLBY;
+ /* Dolby surround = stereo + Dolby */
+ *pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_DOLBYSTEREO;
}
else switch ( acmod )
{
- case 0x0: *pi_channels = AOUT_CHAN_CHANNEL; break;
- case 0x1: *pi_channels = AOUT_CHAN_MONO; break;
- case 0x2: *pi_channels = AOUT_CHAN_STEREO; break;
- case 0x3: *pi_channels = AOUT_CHAN_3F; break;
- case 0x4: *pi_channels = AOUT_CHAN_2F1R; break;
- case 0x5: *pi_channels = AOUT_CHAN_3F1R; break;
- case 0x6: *pi_channels = AOUT_CHAN_2F2R; break;
- case 0x7: *pi_channels = AOUT_CHAN_3F2R; break;
- case 0x8: *pi_channels = AOUT_CHAN_CHANNEL1; break;
- case 0x9: *pi_channels = AOUT_CHAN_CHANNEL2; break;
+ case 0x0:
+ /* Dual-mono = stereo + dual-mono */
+ *pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_DUALMONO;
+ break;
+ case 0x1:
+ /* Mono */
+ *pi_channels = AOUT_CHAN_CENTER;
+ break;
+ case 0x2:
+ /* Stereo */
+ *pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
+ break;
+ case 0x3:
+ /* 3F */
+ *pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER;
+ break;
+ case 0x4:
+ /* 2F1R */
+ *pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER;
+ break;
+ case 0x5:
+ /* 3F1R */
+ *pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
+ | AOUT_CHAN_REARCENTER;
+ break;
+ case 0x6:
+ /* 2F2R */
+ *pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
+ break;
+ case 0x7:
+ /* 3F2R */
+ *pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
+ | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
+ break;
+ default:
+ return 0;
}
if ( p_buf[6] & lfeon[acmod] ) *pi_channels |= AOUT_CHAN_LFE;