/*****************************************************************************
* audio_output.c : audio output thread
*****************************************************************************
* Copyright (C) 1999, 2000, 2001 VideoLAN
* $Id: audio_output.c,v 1.56 2001/03/21 13:42:34 sam Exp $
*
* Authors: Michel Kaempf <maxx@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.
*****************************************************************************/
/* TODO:
*
* - Passer un certain nombre de "fonctions" (genre add_samples) en macro ou
* inline
* - Faire les optimisations dans les fonctions threads :
* = Stocker les "petits calculs" dans des variables au lieu de les refaire
* � chaque boucle
* = Utiliser des tables pour les gros calculs
* - Faire une structure diff�rente pour intf/adec fifo
*
*/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include "defs.h"
#include <unistd.h> /* getpid() */
#include <stdio.h> /* "intf_msg.h" */
#include <stdlib.h> /* calloc(), malloc(), free() */
#include "config.h"
#include "common.h"
#include "threads.h"
#include "mtime.h" /* mtime_t, mdate(), msleep() */
#include "modules.h"
#include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
#include "audio_output.h"
#include "aout_common.h"
#include "main.h"
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int aout_SpawnThread( aout_thread_t * p_aout );
/*****************************************************************************
* aout_CreateThread: initialize audio thread
*****************************************************************************/
aout_thread_t *aout_CreateThread( int *pi_status )
{
aout_thread_t * p_aout; /* thread descriptor */
#if 0
int i_status; /* thread status */
#endif
/* Allocate descriptor */
p_aout = (aout_thread_t *) malloc( sizeof(aout_thread_t) );
if( p_aout == NULL )
{
return( NULL );
}
/* Choose the best module */
p_aout->p_module = module_Need( p_main->p_bank,
MODULE_CAPABILITY_AOUT, NULL );
if( p_aout->p_module == NULL )
{
intf_ErrMsg( "aout error: no suitable aout module" );
free( p_aout );
return( NULL );
}
#define aout_functions p_aout->p_module->p_functions->aout.functions.aout
p_aout->pf_open = aout_functions.pf_open;
p_aout->pf_setformat = aout_functions.pf_setformat;
p_aout->pf_getbufinfo = aout_functions.pf_getbufinfo;
p_aout->pf_play = aout_functions.pf_play;
p_aout->pf_close = aout_functions.pf_close;
#undef aout_functions
/*
* Initialize audio device
*/
if ( p_aout->pf_open( p_aout ) )
{
module_Unneed( p_main->p_bank, p_aout->p_module );
free( p_aout );
return( NULL );
}
if( p_aout->l_rate == 0 )
{
intf_ErrMsg( "aout error: null sample rate" );
p_aout->pf_close( p_aout );
module_Unneed( p_main->p_bank, p_aout->p_module );
free( p_aout );
return( NULL );
}
p_aout->b_stereo = ( p_aout->i_channels == 2 ) ? 1 : 0; /* FIXME: only works
for i_channels == 1 or 2 ??*/
if ( p_aout->pf_setformat( p_aout ) )
{
p_aout->pf_close( p_aout );
module_Unneed( p_main->p_bank, p_aout->p_module );
free( p_aout );
return( NULL );
}
/* Initialize the volume level */
p_aout->vol = VOLUME_DEFAULT;
/* FIXME: maybe it would be cleaner to change SpawnThread prototype
* see vout to handle status correctly ?? however, it is not critical since
* this thread is only called in main and all calls are blocking */
if( aout_SpawnThread( p_aout ) )
{
p_aout->pf_close( p_aout );
module_Unneed( p_main->p_bank, p_aout->p_module );
free( p_aout );
return( NULL );
}
return( p_aout );
}
/*****************************************************************************
* aout_SpawnThread
*****************************************************************************/
static int aout_SpawnThread( aout_thread_t * p_aout )
{
int i_fifo;
long l_bytes;
void * aout_thread = NULL;
/* We want the audio output thread to live */
p_aout->b_die = 0;
p_aout->b_active = 1;
/* Initialize the fifos lock */
vlc_mutex_init( &p_aout->fifos_lock );
/* Initialize audio fifos : set all fifos as empty and initialize locks */
for ( i_fifo = 0; i_fifo < AOUT_MAX_FIFOS; i_fifo++ )
{
p_aout->fifo[i_fifo].i_type = AOUT_EMPTY_FIFO;
vlc_mutex_init( &p_aout->fifo[i_fifo].data_lock );
vlc_cond_init( &p_aout->fifo[i_fifo].data_wait );
}
/* Compute the size (in audio units) of the audio output buffer. Although
* AOUT_BUFFER_DURATION is given in microseconds, the output rate is given
* in Hz, that's why we need to divide by 10^6 microseconds (1 second) */
p_aout->l_units = (long)( ((s64)p_aout->l_rate * AOUT_BUFFER_DURATION) / 1000000 );
p_aout->l_msleep = (long)( ((s64)p_aout->l_units * 1000000) / (s64)p_aout->l_rate );
/* Make aout_thread point to the right thread function, and compute the
* byte size of the audio output buffer */
switch ( p_aout->i_channels )
{
/* Audio output is mono */
case 1:
switch ( p_aout->i_format )
{
case AOUT_FMT_U8:
intf_WarnMsg( 2, "aout info: unsigned 8 bits mono thread" );
l_bytes = 1 * sizeof(u8) * p_aout->l_units;
aout_thread = (void *)aout_U8MonoThread;
break;
case AOUT_FMT_S8:
intf_WarnMsg( 2, "aout info: signed 8 bits mono thread" );
l_bytes = 1 * sizeof(s8) * p_aout->l_units;
aout_thread = (void *)aout_S8MonoThread;
break;
case AOUT_FMT_U16_LE:
case AOUT_FMT_U16_BE:
intf_WarnMsg( 2, "aout info: unsigned 16 bits mono thread" );
l_bytes = 1 * sizeof(u16) * p_aout->l_units;
aout_thread = (void *)aout_U16MonoThread;
break;
case AOUT_FMT_S16_LE:
case AOUT_FMT_S16_BE:
intf_WarnMsg( 2, "aout info: signed 16 bits mono thread" );
l_bytes = 1 * sizeof(s16) * p_aout->l_units;
aout_thread = (void *)aout_S16MonoThread;
break;
default:
intf_ErrMsg( "aout error: unknown audio output format (%i)",
p_aout->i_format );
return( -1 );
}
break;
/* Audio output is stereo */
case 2:
switch ( p_aout->i_format )
{
case AOUT_FMT_U8:
intf_WarnMsg( 2, "aout info: unsigned 8 bits stereo thread" );
l_bytes = 2 * sizeof(u8) * p_aout->l_units;
aout_thread = (void *)aout_U8StereoThread;
break;
case AOUT_FMT_S8:
intf_WarnMsg( 2, "aout info: signed 8 bits stereo thread" );
l_bytes = 2 * sizeof(s8) * p_aout->l_units;
aout_thread = (void *)aout_S8StereoThread;
break;
case AOUT_FMT_U16_LE:
case AOUT_FMT_U16_BE:
intf_WarnMsg( 2, "aout info: unsigned 16 bits stereo thread" );
l_bytes = 2 * sizeof(u16) * p_aout->l_units;
aout_thread = (void *)aout_U16StereoThread;
break;
case AOUT_FMT_S16_LE:
case AOUT_FMT_S16_BE:
intf_WarnMsg( 2, "aout info: signed 16 bits stereo thread" );
l_bytes = 2 * sizeof(s16) * p_aout->l_units;
aout_thread = (void *)aout_S16StereoThread;
break;
default:
intf_ErrMsg( "aout error: unknown audio output format %i",
p_aout->i_format );
return( -1 );
}
break;
default:
intf_ErrMsg( "aout error: unknown number of audio channels (%i)",
p_aout->i_channels );
return( -1 );
}
/* Allocate the memory needed by the audio output buffers, and set to zero
* the s32 buffer's memory */
p_aout->buffer = malloc( l_bytes );
if ( p_aout->buffer == NULL )
{
intf_ErrMsg( "aout error: cannot create output buffer" );
return( -1 );
}
p_aout->s32_buffer = (s32 *)calloc( p_aout->l_units,
sizeof(s32) << ( p_aout->b_stereo ) );
if ( p_aout->s32_buffer == NULL )
{
intf_ErrMsg( "aout error: cannot create the s32 output buffer" );
free( p_aout->buffer );
return( -1 );
}
/* Rough estimate of the playing date */
p_aout->date = mdate();
/* Launch the thread */
if ( vlc_thread_create( &p_aout->thread_id, "audio output",
(vlc_thread_func_t)aout_thread, p_aout ) )
{
intf_ErrMsg( "aout error: cannot spawn audio output thread" );
free( p_aout->buffer );
free( p_aout->s32_buffer );
return( -1 );
}
intf_WarnMsg( 2, "aout info: audio output thread %i spawned", getpid() );
return( 0 );
}
/*****************************************************************************
* aout_DestroyThread
*****************************************************************************/
void aout_DestroyThread( aout_thread_t * p_aout, int *pi_status )
{
int i_fifo;
/* FIXME: pi_status is not handled correctly: check vout how to do!?? */
/* Ask thread to kill itself and wait until it's done */
p_aout->b_die = 1;
vlc_thread_join( p_aout->thread_id ); /* only if pi_status is NULL */
/* Free the allocated memory */
free( p_aout->buffer );
free( p_aout->s32_buffer );
/* Destroy the condition and mutex locks */
for ( i_fifo = 0; i_fifo < AOUT_MAX_FIFOS; i_fifo++ )
{
vlc_mutex_destroy( &p_aout->fifo[i_fifo].data_lock );
vlc_cond_destroy( &p_aout->fifo[i_fifo].data_wait );
}
vlc_mutex_destroy( &p_aout->fifos_lock );
/* Free the plugin */
p_aout->pf_close( p_aout );
/* Release the aout module */
module_Unneed( p_main->p_bank, p_aout->p_module );
/* Free structure */
free( p_aout );
}