/*****************************************************************************
- * ac3_decoder.c: ac3 decoder thread
- * (c)1999 VideoLAN
- *****************************************************************************/
-
-/*
- * TODO :
+ * ac3_decoder.c: core ac3 decoder
+ *****************************************************************************
+ * Copyright (C) 1999, 2000 VideoLAN
+ * $Id: ac3_decoder.c,v 1.28 2001/03/21 13:42:34 sam Exp $
*
- * - vérifier l'état de la fifo de sortie avant d'y stocker les samples
- * décodés ;
- * - vlc_cond_signal() / vlc_cond_wait()
+ * Authors: Michel Kaempf <maxx@via.ecp.fr>
+ * Michel Lespinasse <walken@zoy.org>
+ * Aaron Holtzman <aholtzma@engr.uvic.ca>
*
- */
-
-/*****************************************************************************
- * Preamble
+ * 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.
*****************************************************************************/
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-
-#include <unistd.h> /* getpid() */
-#include <stdio.h> /* "intf_msg.h" */
-#include <stdlib.h> /* malloc(), free() */
-#include <sys/soundcard.h> /* "audio_output.h" */
-#include <sys/uio.h> /* "input.h" */
-
-#include "common.h"
-#include "config.h"
-#include "mtime.h"
-#include "vlc_thread.h"
-#include "debug.h" /* "input_netlist.h" */
-
-#include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
-
-#include "input.h" /* pes_packet_t */
-#include "input_netlist.h" /* input_NetlistFreePES() */
-#include "decoder_fifo.h" /* DECODER_FIFO_(ISEMPTY|START|INCSTART)() */
-
-#include "audio_output.h"
+#include "defs.h"
+#include "int_types.h"
#include "ac3_decoder.h"
-#include "ac3_parse.h"
-#include "ac3_exponent.h"
-#include "ac3_bit_allocate.h"
-#include "ac3_mantissa.h"
-#include "ac3_rematrix.h"
-#include "ac3_imdct.h"
-#include "ac3_downmix.h"
-
-/*****************************************************************************
- * Local prototypes
- *****************************************************************************/
-static int InitThread ( ac3dec_thread_t * p_adec );
-static void RunThread ( ac3dec_thread_t * p_adec );
-static void ErrorThread ( ac3dec_thread_t * p_adec );
-static void EndThread ( ac3dec_thread_t * p_adec );
-
-/*****************************************************************************
- * ac3dec_CreateThread: creates an ac3 decoder thread
- *****************************************************************************/
-ac3dec_thread_t * ac3dec_CreateThread( input_thread_t * p_input )
-{
- ac3dec_thread_t * p_ac3dec;
-
- intf_DbgMsg("ac3dec debug: creating ac3 decoder thread\n");
-
- /* Allocate the memory needed to store the thread's structure */
- if ( (p_ac3dec = (ac3dec_thread_t *)malloc( sizeof(ac3dec_thread_t) )) == NULL )
- {
- intf_ErrMsg("ac3dec error: not enough memory for ac3dec_CreateThread() to create the new thread\n");
- return( NULL );
- }
-
- /*
- * Initialize the thread properties
- */
- p_ac3dec->b_die = 0;
- p_ac3dec->b_error = 0;
-
- /*
- * Initialize the input properties
- */
- /* Initialize the decoder fifo's data lock and conditional variable and set
- * its buffer as empty */
- vlc_mutex_init( &p_ac3dec->fifo.data_lock );
- vlc_cond_init( &p_ac3dec->fifo.data_wait );
- p_ac3dec->fifo.i_start = 0;
- p_ac3dec->fifo.i_end = 0;
- /* Initialize the bit stream structure */
- p_ac3dec->bit_stream.p_input = p_input;
- p_ac3dec->bit_stream.p_decoder_fifo = &p_ac3dec->fifo;
- p_ac3dec->bit_stream.fifo.buffer = 0;
- p_ac3dec->bit_stream.fifo.i_available = 0;
-
- /*
- * Initialize the output properties
- */
- p_ac3dec->p_aout = p_input->p_aout;
- p_ac3dec->p_aout_fifo = NULL;
-
- imdct_init();
-
- /* Spawn the ac3 decoder thread */
- if ( vlc_thread_create(&p_ac3dec->thread_id, "ac3 decoder", (vlc_thread_func_t)RunThread, (void *)p_ac3dec) )
- {
- intf_ErrMsg( "ac3dec error: can't spawn ac3 decoder thread\n" );
- free( p_ac3dec );
- return( NULL );
- }
-
- intf_DbgMsg( "ac3dec debug: ac3 decoder thread (%p) created\n", p_ac3dec );
- return( p_ac3dec );
-}
-
-/*****************************************************************************
- * ac3dec_DestroyThread: destroys an ac3 decoder thread
- *****************************************************************************/
-void ac3dec_DestroyThread( ac3dec_thread_t * p_ac3dec )
-{
- intf_DbgMsg( "ac3dec debug: requesting termination of ac3 decoder thread %p\n", p_ac3dec );
-
- /* Ask thread to kill itself */
- p_ac3dec->b_die = 1;
- /* Make sure the decoder thread leaves the GetByte() function */
- vlc_mutex_lock( &(p_ac3dec->fifo.data_lock) );
- vlc_cond_signal( &(p_ac3dec->fifo.data_wait) );
- vlc_mutex_unlock( &(p_ac3dec->fifo.data_lock) );
-
- /* Waiting for the decoder thread to exit */
- /* Remove this as soon as the "status" flag is implemented */
- vlc_thread_join( p_ac3dec->thread_id );
-}
-
-/* Following functions are local */
-
-/*****************************************************************************
- * decode_find_sync()
- *****************************************************************************/
-static __inline__ int decode_find_sync( ac3dec_thread_t * p_ac3dec )
-{
-#ifdef AC3_SIGSEGV
- int i = 0;
-#endif
-
- while ( (!p_ac3dec->b_die) && (!p_ac3dec->b_error) )
- {
- NeedBits( &(p_ac3dec->bit_stream), 16 );
- if ( (p_ac3dec->bit_stream.fifo.buffer >> (32 - 16)) == 0x0b77 )
- {
- DumpBits( &(p_ac3dec->bit_stream), 16 );
- p_ac3dec->total_bits_read = 16;
-#ifdef AC3_SIGSEGV
- if ( i )
- {
- fprintf( stderr, "ac3dec debug: %i bit(s) skipped to synkronize\n", i );
- }
-#endif
- return( 0 );
- }
-#ifdef AC3_SIGSEGV
- DumpBits( &(p_ac3dec->bit_stream), 1 );
- i += 1;
-#else
- DumpBits( &(p_ac3dec->bit_stream), 8 );
-#endif
- }
- return( -1 );
-}
-
-/*****************************************************************************
- * InitThread : initialize an ac3 decoder thread
- *****************************************************************************/
-static int InitThread( ac3dec_thread_t * p_ac3dec )
-{
- aout_fifo_t aout_fifo;
-
- intf_DbgMsg( "ac3dec debug: initializing ac3 decoder thread %p\n", p_ac3dec );
-
- /* Our first job is to initialize the bit stream structure with the
- * beginning of the input stream */
- vlc_mutex_lock( &p_ac3dec->fifo.data_lock );
- while ( DECODER_FIFO_ISEMPTY(p_ac3dec->fifo) )
- {
- vlc_cond_wait( &p_ac3dec->fifo.data_wait, &p_ac3dec->fifo.data_lock );
- if ( p_ac3dec->bit_stream.p_input->b_die )
- {
- vlc_mutex_unlock( &p_ac3dec->fifo.data_lock );
- return( -1 );
- }
- }
- p_ac3dec->bit_stream.p_ts = DECODER_FIFO_START( p_ac3dec->fifo )->p_first_ts;
- p_ac3dec->bit_stream.i_byte = p_ac3dec->bit_stream.p_ts->i_payload_start;
- vlc_mutex_unlock( &p_ac3dec->fifo.data_lock );
-
- aout_fifo.i_type = AOUT_ADEC_STEREO_FIFO;
- aout_fifo.b_stereo = 1;
+#include "ac3_internal.h"
- aout_fifo.l_frame_size = AC3DEC_FRAME_SIZE;
+#include <stdio.h>
- /* Creating the audio output fifo */
- if ( (p_ac3dec->p_aout_fifo = aout_CreateFifo(p_ac3dec->p_aout, &aout_fifo)) == NULL )
- {
- return( -1 );
- }
-
- intf_DbgMsg( "ac3dec debug: ac3 decoder thread %p initialized\n", p_ac3dec );
- return( 0 );
-}
+void imdct_init (imdct_t * p_imdct);
-/*****************************************************************************
- * RunThread : ac3 decoder thread
- *****************************************************************************/
-static void RunThread( ac3dec_thread_t * p_ac3dec )
+int ac3_init (ac3dec_t * p_ac3dec)
{
- /*
- mtime_t mdate = 0;
- */
-
- intf_DbgMsg( "ac3dec debug: running ac3 decoder thread (%p) (pid == %i)\n", p_ac3dec, getpid() );
-
- /* Initializing the ac3 decoder thread */
- if ( InitThread(p_ac3dec) )
- {
- p_ac3dec->b_error = 1;
- }
-
- /* ac3 decoder thread's main loop */
- while ( (!p_ac3dec->b_die) && (!p_ac3dec->b_error) )
- {
- p_ac3dec->b_invalid = 0;
-
- decode_find_sync( p_ac3dec );
-
- /*
- p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = mdate;
- mdate += 32000;
- */
- if ( DECODER_FIFO_START(p_ac3dec->fifo)->b_has_pts )
- {
- p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = DECODER_FIFO_START(p_ac3dec->fifo)->i_pts;
- DECODER_FIFO_START(p_ac3dec->fifo)->b_has_pts = 0;
- }
- else
- {
- p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = LAST_MDATE;
- }
-
- parse_syncinfo( p_ac3dec );
- switch ( p_ac3dec->syncinfo.fscod )
- {
- case 0:
- p_ac3dec->p_aout_fifo->l_rate = 48000;
- break;
-
- case 1:
- p_ac3dec->p_aout_fifo->l_rate = 44100;
- break;
-
- case 2:
- p_ac3dec->p_aout_fifo->l_rate = 32000;
- break;
-
- default:
- fprintf( stderr, "ac3dec debug: invalid fscod\n" );
- break;
- }
-
- parse_bsi( p_ac3dec );
-
- /* frame 1 */
- parse_audblk( p_ac3dec );
- exponent_unpack( p_ac3dec );
- bit_allocate( p_ac3dec );
- mantissa_unpack( p_ac3dec );
- if ( p_ac3dec->b_invalid )
- {
- continue;
- }
- if ( p_ac3dec->bsi.acmod == 0x2 )
- {
- rematrix( p_ac3dec );
- }
- imdct( p_ac3dec );
- downmix( p_ac3dec, ((ac3dec_frame_t *)p_ac3dec->p_aout_fifo->buffer)[ p_ac3dec->p_aout_fifo->l_end_frame ] );
- vlc_mutex_lock( &p_ac3dec->p_aout_fifo->data_lock );
- p_ac3dec->p_aout_fifo->l_end_frame = (p_ac3dec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
- vlc_cond_signal( &p_ac3dec->p_aout_fifo->data_wait );
- vlc_mutex_unlock( &p_ac3dec->p_aout_fifo->data_lock );
-
- /* frame 2 */
- parse_audblk( p_ac3dec );
- exponent_unpack( p_ac3dec );
- bit_allocate( p_ac3dec );
- mantissa_unpack( p_ac3dec );
- if ( p_ac3dec->b_invalid )
- {
- continue;
- }
- if ( p_ac3dec->bsi.acmod == 0x2 )
- {
- rematrix( p_ac3dec );
- }
- imdct( p_ac3dec );
- downmix( p_ac3dec, ((ac3dec_frame_t *)p_ac3dec->p_aout_fifo->buffer)[ p_ac3dec->p_aout_fifo->l_end_frame ] );
- p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = LAST_MDATE;
- vlc_mutex_lock( &p_ac3dec->p_aout_fifo->data_lock );
- p_ac3dec->p_aout_fifo->l_end_frame = (p_ac3dec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
- vlc_cond_signal( &p_ac3dec->p_aout_fifo->data_wait );
- vlc_mutex_unlock( &p_ac3dec->p_aout_fifo->data_lock );
-
- /* frame 3 */
- parse_audblk( p_ac3dec );
- exponent_unpack( p_ac3dec );
- bit_allocate( p_ac3dec );
- mantissa_unpack( p_ac3dec );
- if ( p_ac3dec->b_invalid )
- {
- continue;
- }
- if ( p_ac3dec->bsi.acmod == 0x2 )
- {
- rematrix( p_ac3dec );
- }
- imdct( p_ac3dec );
- downmix( p_ac3dec, ((ac3dec_frame_t *)p_ac3dec->p_aout_fifo->buffer)[ p_ac3dec->p_aout_fifo->l_end_frame ] );
- p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = LAST_MDATE;
- vlc_mutex_lock( &p_ac3dec->p_aout_fifo->data_lock );
- p_ac3dec->p_aout_fifo->l_end_frame = (p_ac3dec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
- vlc_cond_signal( &p_ac3dec->p_aout_fifo->data_wait );
- vlc_mutex_unlock( &p_ac3dec->p_aout_fifo->data_lock );
-
- /* frame 4 */
- parse_audblk( p_ac3dec );
- exponent_unpack( p_ac3dec );
- bit_allocate( p_ac3dec );
- mantissa_unpack( p_ac3dec );
- if ( p_ac3dec->b_invalid )
- {
- continue;
- }
- if ( p_ac3dec->bsi.acmod == 0x2 )
- {
- rematrix( p_ac3dec );
- }
- imdct( p_ac3dec );
- downmix( p_ac3dec, ((ac3dec_frame_t *)p_ac3dec->p_aout_fifo->buffer)[ p_ac3dec->p_aout_fifo->l_end_frame ] );
- p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = LAST_MDATE;
- vlc_mutex_lock( &p_ac3dec->p_aout_fifo->data_lock );
- p_ac3dec->p_aout_fifo->l_end_frame = (p_ac3dec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
- vlc_cond_signal( &p_ac3dec->p_aout_fifo->data_wait );
- vlc_mutex_unlock( &p_ac3dec->p_aout_fifo->data_lock );
-
- /* frame 5 */
- parse_audblk( p_ac3dec );
- exponent_unpack( p_ac3dec );
- bit_allocate( p_ac3dec );
- mantissa_unpack( p_ac3dec );
- if ( p_ac3dec->b_invalid )
- {
- continue;
- }
- if ( p_ac3dec->bsi.acmod == 0x2 )
- {
- rematrix( p_ac3dec );
- }
- imdct( p_ac3dec );
- downmix( p_ac3dec, ((ac3dec_frame_t *)p_ac3dec->p_aout_fifo->buffer)[ p_ac3dec->p_aout_fifo->l_end_frame ] );
- p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = LAST_MDATE;
- vlc_mutex_lock( &p_ac3dec->p_aout_fifo->data_lock );
- p_ac3dec->p_aout_fifo->l_end_frame = (p_ac3dec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
- vlc_cond_signal( &p_ac3dec->p_aout_fifo->data_wait );
- vlc_mutex_unlock( &p_ac3dec->p_aout_fifo->data_lock );
-
- /* frame 6 */
- parse_audblk( p_ac3dec );
- exponent_unpack( p_ac3dec );
- bit_allocate( p_ac3dec );
- mantissa_unpack( p_ac3dec );
- if ( p_ac3dec->b_invalid )
- {
- continue;
- }
- if ( p_ac3dec->bsi.acmod == 0x2 )
- {
- rematrix( p_ac3dec );
- }
- imdct( p_ac3dec );
- downmix( p_ac3dec, ((ac3dec_frame_t *)p_ac3dec->p_aout_fifo->buffer)[ p_ac3dec->p_aout_fifo->l_end_frame ] );
- p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = LAST_MDATE;
- vlc_mutex_lock( &p_ac3dec->p_aout_fifo->data_lock );
- p_ac3dec->p_aout_fifo->l_end_frame = (p_ac3dec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
- vlc_cond_signal( &p_ac3dec->p_aout_fifo->data_wait );
- vlc_mutex_unlock( &p_ac3dec->p_aout_fifo->data_lock );
-
- parse_auxdata( p_ac3dec );
- }
-
- /* If b_error is set, the ac3 decoder thread enters the error loop */
- if ( p_ac3dec->b_error )
- {
- ErrorThread( p_ac3dec );
- }
-
- /* End of the ac3 decoder thread */
- EndThread( p_ac3dec );
-}
-
-/*****************************************************************************
- * ErrorThread : ac3 decoder's RunThread() error loop
- *****************************************************************************/
-static void ErrorThread( ac3dec_thread_t * p_ac3dec )
-{
- /* We take the lock, because we are going to read/write the start/end
- * indexes of the decoder fifo */
- vlc_mutex_lock( &p_ac3dec->fifo.data_lock );
-
- /* Wait until a `die' order is sent */
- while( !p_ac3dec->b_die )
- {
- /* Trash all received PES packets */
- while( !DECODER_FIFO_ISEMPTY(p_ac3dec->fifo) )
- {
- input_NetlistFreePES( p_ac3dec->bit_stream.p_input, DECODER_FIFO_START(p_ac3dec->fifo) );
- DECODER_FIFO_INCSTART( p_ac3dec->fifo );
- }
-
- /* Waiting for the input thread to put new PES packets in the fifo */
- vlc_cond_wait( &p_ac3dec->fifo.data_wait, &p_ac3dec->fifo.data_lock );
- }
-
- /* We can release the lock before leaving */
- vlc_mutex_unlock( &p_ac3dec->fifo.data_lock );
+ //p_ac3dec->bit_stream.buffer = 0;
+ //p_ac3dec->bit_stream.i_available = 0;
+ p_ac3dec->mantissa.lfsr_state = 1; /* dither_gen initialization */
+ imdct_init(&p_ac3dec->imdct);
+
+ return 0;
}
-/*****************************************************************************
- * EndThread : ac3 decoder thread destruction
- *****************************************************************************/
-static void EndThread( ac3dec_thread_t * p_ac3dec )
+int ac3_decode_frame (ac3dec_t * p_ac3dec, s16 * buffer)
{
- intf_DbgMsg( "ac3dec debug: destroying ac3 decoder thread %p\n", p_ac3dec );
-
- /* If the audio output fifo was created, we destroy it */
- if ( p_ac3dec->p_aout_fifo != NULL )
- {
- aout_DestroyFifo( p_ac3dec->p_aout_fifo );
+ int i;
+
+ if (parse_bsi (p_ac3dec))
+ return 1;
+
+ for (i = 0; i < 6; i++) {
+ if (parse_audblk (p_ac3dec, i))
+ return 1;
+ if (exponent_unpack (p_ac3dec))
+ return 1;
+ bit_allocate (p_ac3dec);
+ mantissa_unpack (p_ac3dec);
+ if (p_ac3dec->bsi.acmod == 0x2)
+ rematrix (p_ac3dec);
+ imdct (p_ac3dec, buffer);
+// downmix (p_ac3dec, buffer);
+
+ buffer += 2*256;
}
- /* Destroy descriptor */
- free( p_ac3dec );
+ parse_auxdata (p_ac3dec);
- intf_DbgMsg( "ac3dec debug: ac3 decoder thread %p destroyed\n", p_ac3dec );
+ return 0;
}
projects / vlc / blobdiff