--- /dev/null
+/*****************************************************************************
+ * ac3_decoder.c: ac3 decoder thread
+ * (c)1999 VideoLAN
+ *****************************************************************************/
+
+/*
+ * TODO :
+ *
+ * - vérifier l'état de la fifo de sortie avant d'y stocker les samples
+ * décodés ;
+ * - vlc_cond_signal() / vlc_cond_wait()
+ *
+ */
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#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 "ac3_decoder.h"
+#include "ac3_decoder_thread.h"
+#include "ac3_parse.h"
+#include "ac3_imdct.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->ac3_decoder.bit_stream.p_input = p_input;
+ p_ac3dec->ac3_decoder.bit_stream.p_decoder_fifo = &p_ac3dec->fifo;
+ p_ac3dec->ac3_decoder.bit_stream.fifo.buffer = 0;
+ p_ac3dec->ac3_decoder.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 )
+{
+ while ( (!p_ac3dec->b_die) && (!p_ac3dec->b_error) )
+ {
+ NeedBits( &(p_ac3dec->ac3_decoder.bit_stream), 16 );
+ if ( (p_ac3dec->ac3_decoder.bit_stream.fifo.buffer >> (32 - 16)) == 0x0b77 )
+ {
+ DumpBits( &(p_ac3dec->ac3_decoder.bit_stream), 16 );
+ p_ac3dec->ac3_decoder.total_bits_read = 16;
+ return( 0 );
+ }
+ DumpBits( &(p_ac3dec->ac3_decoder.bit_stream), 1 ); /* XXX */
+ }
+ 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) )
+ {
+ if ( p_ac3dec->b_die )
+ {
+ vlc_mutex_unlock( &p_ac3dec->fifo.data_lock );
+ return( -1 );
+ }
+ vlc_cond_wait( &p_ac3dec->fifo.data_wait, &p_ac3dec->fifo.data_lock );
+ }
+ p_ac3dec->ac3_decoder.bit_stream.p_ts = DECODER_FIFO_START( p_ac3dec->fifo )->p_first_ts;
+ p_ac3dec->ac3_decoder.bit_stream.p_byte = p_ac3dec->ac3_decoder.bit_stream.p_ts->buffer + p_ac3dec->ac3_decoder.bit_stream.p_ts->i_payload_start;
+ p_ac3dec->ac3_decoder.bit_stream.p_end = p_ac3dec->ac3_decoder.bit_stream.p_ts->buffer + p_ac3dec->ac3_decoder.bit_stream.p_ts->i_payload_end;
+ vlc_mutex_unlock( &p_ac3dec->fifo.data_lock );
+
+ aout_fifo.i_type = AOUT_ADEC_STEREO_FIFO;
+ aout_fifo.i_channels = 2;
+ aout_fifo.b_stereo = 1;
+
+ aout_fifo.l_frame_size = AC3DEC_FRAME_SIZE;
+
+ /* 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 );
+}
+
+/*****************************************************************************
+ * RunThread : ac3 decoder thread
+ *****************************************************************************/
+static void RunThread( ac3dec_thread_t * p_ac3dec )
+{
+ intf_DbgMsg( "ac3dec debug: running ac3 decoder thread (%p) (pid == %i)\n", p_ac3dec, getpid() );
+
+ msleep( INPUT_PTS_DELAY );
+
+ /* Initializing the ac3 decoder thread */
+ if ( InitThread(p_ac3dec) ) /* XXX */
+ {
+ p_ac3dec->b_error = 1;
+ }
+
+ /* ac3 decoder thread's main loop */
+ /* FIXME : do we have enough room to store the decoded frames ? */
+ while ( (!p_ac3dec->b_die) && (!p_ac3dec->b_error) )
+ {
+ int i;
+
+ p_ac3dec->ac3_decoder.b_invalid = 0;
+
+ decode_find_sync( p_ac3dec );
+
+ 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->ac3_decoder );
+ switch ( p_ac3dec->ac3_decoder.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: /* XXX */
+ fprintf( stderr, "ac3dec debug: invalid fscod\n" );
+ p_ac3dec->ac3_decoder.b_invalid = 1;
+ break;
+ }
+ if ( p_ac3dec->ac3_decoder.b_invalid ) /* XXX */
+ {
+ continue;
+ }
+
+ parse_bsi( &p_ac3dec->ac3_decoder );
+
+ for (i = 0; i < 6; i++)
+ {
+ s16 * buffer;
+
+ buffer = ((ac3dec_frame_t *)p_ac3dec->p_aout_fifo->buffer)[ p_ac3dec->p_aout_fifo->l_end_frame ];
+
+ if (ac3_audio_block (&p_ac3dec->ac3_decoder, buffer))
+ goto bad_frame;
+
+ if (i)
+ 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->ac3_decoder );
+bad_frame:
+ }
+
+ /* 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->ac3_decoder.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 );
+}
+
+/*****************************************************************************
+ * EndThread : ac3 decoder thread destruction
+ *****************************************************************************/
+static void EndThread( ac3dec_thread_t * p_ac3dec )
+{
+ 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 );
+
+ /* Make sure the output thread leaves the NextFrame() function */
+ vlc_mutex_lock( &(p_ac3dec->p_aout_fifo->data_lock) );
+ vlc_cond_signal( &(p_ac3dec->p_aout_fifo->data_wait) );
+ vlc_mutex_unlock( &(p_ac3dec->p_aout_fifo->data_lock) );
+ }
+
+ /* Destroy descriptor */
+ free( p_ac3dec );
+
+ intf_DbgMsg( "ac3dec debug: ac3 decoder thread %p destroyed\n", p_ac3dec );
+}
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