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VLC Source 0.5.3.dmg
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audio_output
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dec.c
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/*****************************************************************************
* dec.c : audio output API towards decoders
*****************************************************************************
* Copyright (C) 2002 VideoLAN
* $Id: dec.c,v 1.9 2003/03/06 23:10:11 gbazin Exp $
*
* Authors: 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
* 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.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <stdlib.h> /* calloc(), malloc(), free() */
#include <string.h>
#include <vlc/vlc.h>
#ifdef HAVE_ALLOCA_H
# include <alloca.h>
#endif
#include "audio_output.h"
#include "aout_internal.h"
#include <vlc/input.h> /* for input_thread_t and i_pts_delay */
/*
* Creation/Deletion
*/
/*****************************************************************************
* aout_DecNew : create a decoder
*****************************************************************************/
static aout_input_t * DecNew( vlc_object_t * p_this, aout_instance_t * p_aout,
audio_sample_format_t * p_format )
{
aout_input_t * p_input;
input_thread_t * p_input_thread;
/* We can only be called by the decoder, so no need to lock
* p_input->lock. */
vlc_mutex_lock( &p_aout->mixer_lock );
if ( p_aout->i_nb_inputs >= AOUT_MAX_INPUTS )
{
msg_Err( p_aout, "too many inputs already (%d)", p_aout->i_nb_inputs );
return NULL;
}
p_input = malloc(sizeof(aout_input_t));
if ( p_input == NULL )
{
msg_Err( p_aout, "out of memory" );
return NULL;
}
vlc_mutex_init( p_aout, &p_input->lock );
p_input->b_changed = 0;
p_input->b_error = 1;
aout_FormatPrepare( p_format );
memcpy( &p_input->input, p_format,
sizeof(audio_sample_format_t) );
p_aout->pp_inputs[p_aout->i_nb_inputs] = p_input;
p_aout->i_nb_inputs++;
if ( p_aout->mixer.b_error )
{
int i;
if ( var_Type( p_aout, "audio-device" ) != 0 )
{
var_Destroy( p_aout, "audio-device" );
}
if ( var_Type( p_aout, "audio-channels" ) != 0 )
{
var_Destroy( p_aout, "audio-channels" );
}
/* Recreate the output using the new format. */
if ( aout_OutputNew( p_aout, p_format ) < 0 )
{
for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
{
vlc_mutex_lock( &p_aout->pp_inputs[i]->lock );
aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
vlc_mutex_unlock( &p_aout->pp_inputs[i]->lock );
}
vlc_mutex_unlock( &p_aout->mixer_lock );
return p_input;
}
/* Create other input streams. */
for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
{
vlc_mutex_lock( &p_aout->pp_inputs[i]->lock );
aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
aout_InputNew( p_aout, p_aout->pp_inputs[i] );
vlc_mutex_unlock( &p_aout->pp_inputs[i]->lock );
}
}
else
{
aout_MixerDelete( p_aout );
}
if ( aout_MixerNew( p_aout ) == -1 )
{
aout_OutputDelete( p_aout );
vlc_mutex_unlock( &p_aout->mixer_lock );
return NULL;
}
aout_MixerNew( p_aout );
aout_InputNew( p_aout, p_input );
vlc_mutex_unlock( &p_aout->mixer_lock );
p_input_thread = (input_thread_t *)vlc_object_find( p_this,
VLC_OBJECT_INPUT, FIND_PARENT );
if( p_input_thread )
{
p_aout->i_pts_delay = p_input_thread->i_pts_delay;
vlc_object_release( p_input_thread );
}
else
{
p_aout->i_pts_delay = DEFAULT_PTS_DELAY;
}
return p_input;
}
aout_input_t * __aout_DecNew( vlc_object_t * p_this,
aout_instance_t ** pp_aout,
audio_sample_format_t * p_format )
{
if ( *pp_aout == NULL )
{
/* Create an audio output if there is none. */
*pp_aout = vlc_object_find( p_this, VLC_OBJECT_AOUT, FIND_ANYWHERE );
if( *pp_aout == NULL )
{
msg_Dbg( p_this, "no aout present, spawning one" );
*pp_aout = aout_New( p_this );
/* Everything failed, I'm a loser, I just wanna die */
if( *pp_aout == NULL )
{
return NULL;
}
}
else
{
vlc_object_release( *pp_aout );
}
}
return DecNew( p_this, *pp_aout, p_format );
}
/*****************************************************************************
* aout_DecDelete : delete a decoder
*****************************************************************************/
int aout_DecDelete( aout_instance_t * p_aout, aout_input_t * p_input )
{
int i_input;
/* This function can only be called by the decoder itself, so no need
* to lock p_input->lock. */
vlc_mutex_lock( &p_aout->mixer_lock );
for ( i_input = 0; i_input < p_aout->i_nb_inputs; i_input++ )
{
if ( p_aout->pp_inputs[i_input] == p_input )
{
break;
}
}
if ( i_input == p_aout->i_nb_inputs )
{
msg_Err( p_aout, "cannot find an input to delete" );
return -1;
}
/* Remove the input from the list. */
memmove( &p_aout->pp_inputs[i_input], &p_aout->pp_inputs[i_input + 1],
(AOUT_MAX_INPUTS - i_input - 1) * sizeof(aout_input_t *) );
p_aout->i_nb_inputs--;
aout_InputDelete( p_aout, p_input );
vlc_mutex_destroy( &p_input->lock );
free( p_input );
if ( !p_aout->i_nb_inputs )
{
aout_OutputDelete( p_aout );
aout_MixerDelete( p_aout );
if ( var_Type( p_aout, "audio-device" ) != 0 )
{
var_Destroy( p_aout, "audio-device" );
}
if ( var_Type( p_aout, "audio-channels" ) != 0 )
{
var_Destroy( p_aout, "audio-channels" );
}
}
vlc_mutex_unlock( &p_aout->mixer_lock );
return 0;
}
/*
* Buffer management
*/
/*****************************************************************************
* aout_DecNewBuffer : ask for a new empty buffer
*****************************************************************************/
aout_buffer_t * aout_DecNewBuffer( aout_instance_t * p_aout,
aout_input_t * p_input,
size_t i_nb_samples )
{
aout_buffer_t * p_buffer;
mtime_t duration;
vlc_mutex_lock( &p_input->lock );
if ( p_input->b_error )
{
vlc_mutex_unlock( &p_input->lock );
return NULL;
}
duration = (1000000 * (mtime_t)i_nb_samples) / p_input->input.i_rate;
/* This necessarily allocates in the heap. */
aout_BufferAlloc( &p_input->input_alloc, duration, NULL, p_buffer );
p_buffer->i_nb_samples = i_nb_samples;
p_buffer->i_nb_bytes = i_nb_samples * p_input->input.i_bytes_per_frame
/ p_input->input.i_frame_length;
/* Suppose the decoder doesn't have more than one buffered buffer */
p_input->b_changed = 0;
vlc_mutex_unlock( &p_input->lock );
if ( p_buffer == NULL )
{
msg_Err( p_aout, "NULL buffer !" );
}
else
{
p_buffer->start_date = p_buffer->end_date = 0;
}
return p_buffer;
}
/*****************************************************************************
* aout_DecDeleteBuffer : destroy an undecoded buffer
*****************************************************************************/
void aout_DecDeleteBuffer( aout_instance_t * p_aout, aout_input_t * p_input,
aout_buffer_t * p_buffer )
{
aout_BufferFree( p_buffer );
}
/*****************************************************************************
* aout_DecPlay : filter & mix the decoded buffer
*****************************************************************************/
int aout_DecPlay( aout_instance_t * p_aout, aout_input_t * p_input,
aout_buffer_t * p_buffer )
{
if ( p_buffer->start_date == 0 )
{
msg_Warn( p_aout, "non-dated buffer received" );
aout_BufferFree( p_buffer );
return -1;
}
if ( p_buffer->start_date > mdate() + p_aout->i_pts_delay +
AOUT_MAX_ADVANCE_TIME )
{
msg_Warn( p_aout, "received buffer in the future ("I64Fd")",
p_buffer->start_date - mdate());
aout_BufferFree( p_buffer );
return -1;
}
p_buffer->end_date = p_buffer->start_date
+ (mtime_t)(p_buffer->i_nb_samples * 1000000)
/ p_input->input.i_rate;
vlc_mutex_lock( &p_input->lock );
if ( p_input->b_error )
{
vlc_mutex_unlock( &p_input->lock );
aout_BufferFree( p_buffer );
return -1;
}
if ( p_input->b_changed )
{
/* Maybe the allocation size has changed. Re-allocate a buffer. */
aout_buffer_t * p_new_buffer;
mtime_t duration = (1000000 * (mtime_t)p_buffer->i_nb_samples)
/ p_input->input.i_rate;
aout_BufferAlloc( &p_input->input_alloc, duration, NULL, p_new_buffer );
p_aout->p_vlc->pf_memcpy( p_new_buffer->p_buffer, p_buffer->p_buffer,
p_buffer->i_nb_bytes );
p_new_buffer->i_nb_samples = p_buffer->i_nb_samples;
p_new_buffer->i_nb_bytes = p_buffer->i_nb_bytes;
p_new_buffer->start_date = p_buffer->start_date;
p_new_buffer->end_date = p_buffer->end_date;
aout_BufferFree( p_buffer );
p_buffer = p_new_buffer;
p_input->b_changed = 0;
}
/* If the buffer is too early, wait a while. */
mwait( p_buffer->start_date - AOUT_MAX_PREPARE_TIME );
if ( aout_InputPlay( p_aout, p_input, p_buffer ) == -1 )
{
vlc_mutex_unlock( &p_input->lock );
return -1;
}
vlc_mutex_unlock( &p_input->lock );
/* Run the mixer if it is able to run. */
vlc_mutex_lock( &p_aout->mixer_lock );
aout_MixerRun( p_aout );
vlc_mutex_unlock( &p_aout->mixer_lock );
return 0;
}