/*****************************************************************************
* mpeg_adec.c: MPEG audio decoder thread
*****************************************************************************
* Copyright (C) 1999-2001 VideoLAN
* $Id: mpeg_adec.c,v 1.9 2001/12/30 05:38:44 sam Exp $
*
* Authors: Michel Kaempf <maxx@via.ecp.fr>
* Michel Lespinasse <walken@via.ecp.fr>
* Samuel Hocevar <sam@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
* 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.
*****************************************************************************/
#define MODULE_NAME mpeg_adec
#include "modules_inner.h"
/*****************************************************************************
* Preamble
*****************************************************************************/
#include "defs.h"
#include <stdlib.h> /* malloc(), free() */
#include <string.h>
#include "common.h" /* boolean_t, byte_t */
#include "intf_msg.h"
#include "threads.h"
#include "mtime.h"
#include "tests.h"
#include "audio_output.h" /* aout_fifo_t (for audio_decoder.h) */
#include "stream_control.h"
#include "input_ext-dec.h"
#include "mpeg_adec_generic.h"
#include "mpeg_adec.h"
#include "modules.h"
#include "modules_export.h"
#define ADEC_FRAME_SIZE (2*1152)
/*****************************************************************************
* Local Prototypes
*****************************************************************************/
static int decoder_Probe ( probedata_t * );
static int decoder_Run ( decoder_config_t * );
static void EndThread ( adec_thread_t * );
static void DecodeThread ( adec_thread_t * );
/*****************************************************************************
* Capabilities
*****************************************************************************/
void _M( adec_getfunctions )( function_list_t * p_function_list )
{
p_function_list->pf_probe = decoder_Probe;
p_function_list->functions.dec.pf_run = decoder_Run;
}
/*****************************************************************************
* Build configuration tree.
*****************************************************************************/
MODULE_CONFIG_START
ADD_WINDOW( "Configuration for mpeg audio decoder module" )
ADD_COMMENT( "Nothing to configure" )
MODULE_CONFIG_STOP
MODULE_INIT_START
p_module->i_capabilities = MODULE_CAPABILITY_DEC;
p_module->psz_longname = "Mpeg I layer 1/2 audio decoder";
MODULE_INIT_STOP
MODULE_ACTIVATE_START
_M( adec_getfunctions )( &p_module->p_functions->dec );
MODULE_ACTIVATE_STOP
MODULE_DEACTIVATE_START
MODULE_DEACTIVATE_STOP
/*****************************************************************************
* decoder_Probe: probe the decoder and return score
*****************************************************************************/
static int decoder_Probe( probedata_t *p_data )
{
if( p_data->i_type == MPEG1_AUDIO_ES || p_data->i_type == MPEG2_AUDIO_ES )
{
if( !TestCPU( CPU_CAPABILITY_FPU ) )
{
/* This can work but we'd really prefer libmad to take over. */
return( 1 );
}
if( TestMethod( ADEC_MPEG_VAR, "builtin" ) )
{
return( 999 );
}
return( 100 );
}
return( 0 );
}
/*****************************************************************************
* decoder_Run: initialize, go inside main loop, detroy
*****************************************************************************/
static int decoder_Run ( decoder_config_t * p_config )
{
adec_thread_t * p_adec;
intf_DbgMsg("mpeg_adec debug: thread launched, initializing.");
/* Allocate the memory needed to store the thread's structure */
if ( (p_adec = (adec_thread_t *)malloc (sizeof(adec_thread_t))) == NULL )
{
intf_ErrMsg ( "adec error: not enough memory for"
" adec_CreateThread() to create the new thread" );
DecoderError( p_config->p_decoder_fifo );
return 0;
}
/*
* Initialize the thread properties
*/
p_adec->p_config = p_config;
p_adec->p_fifo = p_config->p_decoder_fifo;
/*
* Initilize the banks
*/
p_adec->bank_0.actual = p_adec->bank_0.v1;
p_adec->bank_0.pos = 0;
p_adec->bank_1.actual = p_adec->bank_1.v1;
p_adec->bank_1.pos = 0;
/*
* Initialize bit stream
*/
p_adec->p_config->pf_init_bit_stream( &p_adec->bit_stream,
p_adec->p_config->p_decoder_fifo, NULL, NULL );
/* Create the audio output fifo */
p_adec->p_aout_fifo = aout_CreateFifo( AOUT_ADEC_STEREO_FIFO, 2, 0, 0,
ADEC_FRAME_SIZE, NULL );
if ( p_adec->p_aout_fifo == NULL )
{
intf_ErrMsg("mpeg_adec error: cannot create audio output fifo");
return -1;
}
intf_DbgMsg("mpeg_adec debug: thread initialized, decoding begins.");
p_adec->i_sync = 0;
/* Audio decoder thread's main loop */
while( (!p_adec->p_fifo->b_die) && (!p_adec->p_fifo->b_error) )
{
DecodeThread( p_adec );
}
/* If b_error is set, the audio decoder thread enters the error loop */
if( p_adec->p_fifo->b_error )
{
DecoderError( p_adec->p_fifo );
}
/* End of the audio decoder thread */
EndThread( p_adec );
return( 0 );
}
/*
* Following finctions are local to this module
*/
/*****************************************************************************
* DecodeThread: decodes a mpeg frame
*****************************************************************************/
static void DecodeThread( adec_thread_t * p_adec )
{
s16 * buffer;
adec_sync_info_t sync_info;
if( ! adec_SyncFrame (p_adec, &sync_info) )
{
p_adec->i_sync = 1;
p_adec->p_aout_fifo->l_rate = sync_info.sample_rate;
buffer = ((s16 *)p_adec->p_aout_fifo->buffer)
+ (p_adec->p_aout_fifo->l_end_frame * ADEC_FRAME_SIZE);
if( p_adec->p_fifo->p_first->i_pts )
{
p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] =
p_adec->p_fifo->p_first->i_pts;
p_adec->p_fifo->p_first->i_pts = 0;
}
else
{
p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] =
LAST_MDATE;
}
if( adec_DecodeFrame (p_adec, buffer) )
{
/* Ouch, failed decoding... We'll have to resync */
p_adec->i_sync = 0;
}
else
{
vlc_mutex_lock (&p_adec->p_aout_fifo->data_lock);
p_adec->p_aout_fifo->l_end_frame =
(p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
vlc_cond_signal (&p_adec->p_aout_fifo->data_wait);
vlc_mutex_unlock (&p_adec->p_aout_fifo->data_lock);
}
}
}
/*****************************************************************************
* EndThread : audio decoder thread destruction
*****************************************************************************
* This function is called when the thread ends after a sucessful
* initialization.
*****************************************************************************/
static void EndThread ( adec_thread_t *p_adec )
{
intf_DbgMsg ( "adec debug: destroying audio decoder thread %p", p_adec );
/* If the audio output fifo was created, we destroy it */
if ( p_adec->p_aout_fifo != NULL )
{
aout_DestroyFifo ( p_adec->p_aout_fifo );
/* Make sure the output thread leaves the NextFrame() function */
vlc_mutex_lock (&(p_adec->p_aout_fifo->data_lock));
vlc_cond_signal (&(p_adec->p_aout_fifo->data_wait));
vlc_mutex_unlock (&(p_adec->p_aout_fifo->data_lock));
}
/* Destroy descriptor */
free( p_adec );
intf_DbgMsg ("adec debug: audio decoder thread %p destroyed", p_adec);
}