* a52.c: A/52 basic parser
*****************************************************************************
* Copyright (C) 2001-2002 VideoLAN
- * $Id: a52.c,v 1.19 2002/12/06 16:34:05 sam Exp $
+ * $Id: a52.c,v 1.20 2002/12/28 02:02:18 massiot Exp $
*
* Authors: Stéphane Borel <stef@via.ecp.fr>
* Christophe Massiot <massiot@via.ecp.fr>
return -1;
}
- /* decoder thread's main loop */
+ /* Decoder thread's main loop */
while ( !p_dec->p_fifo->b_die && !p_dec->p_fifo->b_error )
{
int i_bit_rate;
/* Look for sync word - should be 0x0b77 */
RealignBits( &p_dec->bit_stream );
while ( (ShowBits( &p_dec->bit_stream, 16 ) ) != 0x0b77 &&
- (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error))
+ (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error) )
{
RemoveBits( &p_dec->bit_stream, 8 );
}
+ if ( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error ) break;
/* Set the Presentation Time Stamp */
NextPTS( &p_dec->bit_stream, &pts, NULL );
/* Get A/52 frame header */
GetChunk( &p_dec->bit_stream, p_header, 7 );
- if( p_dec->p_fifo->b_die ) break;
+ if ( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error ) break;
/* Check if frame is valid and get frame info */
i_frame_size = SyncInfo( p_header, &i_original_channels, &i_rate,
p_buffer = aout_DecNewBuffer( p_dec->p_aout, p_dec->p_aout_input,
A52_FRAME_NB );
- if ( p_buffer == NULL ) return -1;
+ if ( p_buffer == NULL )
+ {
+ p_dec->p_fifo->b_error = 1;
+ break;
+ }
p_buffer->start_date = aout_DateGet( &end_date );
p_buffer->end_date = aout_DateIncrement( &end_date,
A52_FRAME_NB );
break;
}
- /* Send the buffer to the mixer. */
+ /* Send the buffer to the aout core. */
aout_DecPlay( p_dec->p_aout, p_dec->p_aout_input, p_buffer );
}
- /* If b_error is set, the spdif thread enters the error loop */
if( p_dec->p_fifo->b_error )
{
DecoderError( p_dec->p_fifo );
}
- /* End of the spdif decoder thread */
EndThread( p_dec );
return 0;
* lpcm.c: lpcm decoder module
*****************************************************************************
* Copyright (C) 1999-2001 VideoLAN
- * $Id: lpcm.c,v 1.7 2002/11/14 22:38:47 massiot Exp $
+ * $Id: lpcm.c,v 1.8 2002/12/28 02:02:18 massiot Exp $
*
* Authors: Samuel Hocevar <sam@zoy.org>
* Henri Fallon <henri@videolan.org>
+ * Christophe Massiot <massiot@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
# include <unistd.h> /* getpid() */
#endif
-#define LPCM_FRAME_NB 502
+/* DVD PES size (2048) - 40 bytes (headers) */
+#define LPCM_FRAME_LENGTH 2008
/*****************************************************************************
* dec_thread_t : lpcm decoder thread descriptor
audio_date_t end_date;
} dec_thread_t;
+/*
+ * LPCM header :
+ * - PES header
+ * - private stream ID (16 bits) == 0xA0 -> not in the bitstream
+ * - frame number (8 bits)
+ * - unknown (16 bits) == 0x0003 ?
+ * - unknown (4 bits)
+ * - current frame (4 bits)
+ * - unknown (2 bits)
+ * - frequency (2 bits) 0 == 48 kHz, 1 == 32 kHz, 2 == ?, 3 == ?
+ * - unknown (1 bit)
+ * - number of channels - 1 (3 bits) 1 == 2 channels
+ * - start code (8 bits) == 0x80
+ */
+
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int OpenDecoder ( vlc_object_t * );
static int RunDecoder ( decoder_fifo_t * );
- void DecodeFrame ( dec_thread_t * );
-// static int InitThread ( dec_thread_t * );
+static void DecodeFrame ( dec_thread_t * );
static void EndThread ( dec_thread_t * );
/*****************************************************************************
return -1;
}
- /* FIXME : I suppose the number of channel and sampling rate
- * are somewhere in the headers */
p_dec->output_format.i_format = VLC_FOURCC('s','1','6','b');
- p_dec->output_format.i_physical_channels
- = p_dec->output_format.i_original_channels
- = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
- p_dec->output_format.i_rate = 48000;
-
- aout_DateInit( &p_dec->end_date, 48000 );
p_dec->p_aout = NULL;
- p_dec->p_aout_input = aout_DecNew( p_dec->p_fifo,
- &p_dec->p_aout,
- &p_dec->output_format );
-
- if ( p_dec->p_aout_input == NULL )
- {
- msg_Err( p_dec->p_fifo, "failed to create aout fifo" );
- p_dec->p_fifo->b_error = 1;
- EndThread( p_dec );
- return( -1 );
- }
+ p_dec->p_aout_input = NULL;
- /* lpcm decoder thread's main loop */
+ /* LPCM decoder thread's main loop */
while ( (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error) )
{
DecodeFrame(p_dec);
/*****************************************************************************
* DecodeFrame: decodes a frame.
*****************************************************************************/
-void DecodeFrame( dec_thread_t * p_dec )
+static void DecodeFrame( dec_thread_t * p_dec )
{
- aout_buffer_t * p_aout_buffer;
- mtime_t i_pts;
+ aout_buffer_t * p_buffer;
+ mtime_t i_pts;
+ uint8_t i_header;
+ unsigned int i_rate, i_original_channels;
+
+ /* Look for sync word - should be 0xXX80 */
+ RealignBits( &p_dec->bit_stream );
+ while ( (ShowBits( &p_dec->bit_stream, 16 ) & 0xc8ff) != 0x0080 &&
+ (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error) )
+ {
+ RemoveBits( &p_dec->bit_stream, 8 );
+ }
+ if ( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error ) return;
NextPTS( &p_dec->bit_stream, &i_pts, NULL );
-
if( i_pts != 0 && i_pts != aout_DateGet( &p_dec->end_date ) )
{
aout_DateSet( &p_dec->end_date, i_pts );
}
- p_aout_buffer = aout_DecNewBuffer( p_dec->p_aout,
- p_dec->p_aout_input,
- LPCM_FRAME_NB );
-
- if( !p_aout_buffer )
+ /* Get LPCM header. */
+ i_header = GetBits( &p_dec->bit_stream, 16 ) >> 8;
+
+ switch ( i_header >> 4 )
{
- msg_Err( p_dec->p_fifo, "cannot get aout buffer" );
+ case 0:
+ i_rate = 48000;
+ break;
+ case 1:
+ i_rate = 32000;
+ break;
+ default:
+ msg_Err( p_dec->p_fifo, "unsupported LPCM rate (0x%x)", i_header );
p_dec->p_fifo->b_error = 1;
return;
}
-
- p_aout_buffer->start_date = aout_DateGet( &p_dec->end_date );
- p_aout_buffer->end_date = aout_DateIncrement( &p_dec->end_date,
- LPCM_FRAME_NB );
- /* Look for sync word - should be 0x0180 */
- RealignBits( &p_dec->bit_stream );
- while ( (GetBits( &p_dec->bit_stream, 16 ) ) != 0x0180 &&
- (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error));
+ switch ( i_header & 0x7 )
+ {
+ case 0:
+ i_original_channels = AOUT_CHAN_CENTER;
+ break;
+ case 1:
+ i_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
+ break;
+ case 3:
+ i_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
+ break;
+ case 5:
+ i_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
+ | AOUT_CHAN_CENTER | AOUT_CHAN_LFE;
+ break;
+ case 2:
+ case 4:
+ case 6:
+ case 7:
+ default:
+ msg_Err( p_dec->p_fifo, "unsupported LPCM channels (0x%x)",
+ i_header );
+ p_dec->p_fifo->b_error = 1;
+ return;
+ }
+
+ if( (p_dec->p_aout_input != NULL) &&
+ ( (p_dec->output_format.i_rate != i_rate)
+ || (p_dec->output_format.i_original_channels
+ != i_original_channels) ) )
+ {
+ /* Parameters changed - this should not happen. */
+ aout_DecDelete( p_dec->p_aout, p_dec->p_aout_input );
+ p_dec->p_aout_input = NULL;
+ }
+
+ /* Creating the audio input if not created yet. */
+ if( p_dec->p_aout_input == NULL )
+ {
+ p_dec->output_format.i_rate = i_rate;
+ p_dec->output_format.i_original_channels = i_original_channels;
+ p_dec->output_format.i_physical_channels
+ = i_original_channels & AOUT_CHAN_PHYSMASK;
+ aout_DateInit( &p_dec->end_date, i_rate );
+ p_dec->p_aout_input = aout_DecNew( p_dec->p_fifo,
+ &p_dec->p_aout,
+ &p_dec->output_format );
+
+ if ( p_dec->p_aout_input == NULL )
+ {
+ p_dec->p_fifo->b_error = 1;
+ return;
+ }
+ }
+
+ if ( !aout_DateGet( &p_dec->end_date ) )
+ {
+ byte_t p_junk[LPCM_FRAME_LENGTH];
- GetChunk( &p_dec->bit_stream, p_aout_buffer->p_buffer,
- LPCM_FRAME_NB * 4);
+ /* We've just started the stream, wait for the first PTS. */
+ GetChunk( &p_dec->bit_stream, p_junk, LPCM_FRAME_LENGTH );
+ return;
+ }
+
+ p_buffer = aout_DecNewBuffer( p_dec->p_aout, p_dec->p_aout_input,
+ LPCM_FRAME_LENGTH / p_dec->output_format.i_bytes_per_frame );
+
+ if( p_buffer == NULL )
+ {
+ msg_Err( p_dec->p_fifo, "cannot get aout buffer" );
+ p_dec->p_fifo->b_error = 1;
+ return;
+ }
+ p_buffer->start_date = aout_DateGet( &p_dec->end_date );
+ p_buffer->end_date = aout_DateIncrement( &p_dec->end_date,
+ LPCM_FRAME_LENGTH / p_dec->output_format.i_bytes_per_frame );
+ /* Get the whole frame. */
+ GetChunk( &p_dec->bit_stream, p_buffer->p_buffer,
+ LPCM_FRAME_LENGTH);
if( p_dec->p_fifo->b_die )
{
aout_DecDeleteBuffer( p_dec->p_aout, p_dec->p_aout_input,
- p_aout_buffer );
+ p_buffer );
return;
}
- aout_DecPlay( p_dec->p_aout, p_dec->p_aout_input,
- p_aout_buffer );
+ /* Send the buffer to the aout core. */
+ aout_DecPlay( p_dec->p_aout, p_dec->p_aout_input, p_buffer );
}
/*****************************************************************************