/*****************************************************************************
* mixer.c : audio output mixing operations
*****************************************************************************
* Copyright (C) 2002-2004 the VideoLAN team
* $Id$
*
* 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stddef.h>
#include "vlc_common.h"
#ifdef HAVE_ALLOCA_H
# include <alloca.h>
#endif
#include "vlc_aout.h"
#include "aout_internal.h"
/*****************************************************************************
* aout_MixerNew: prepare a mixer plug-in
*****************************************************************************
* Please note that you must hold the mixer lock.
*****************************************************************************/
int aout_MixerNew( aout_instance_t * p_aout )
{
p_aout->mixer.p_module = module_Need( p_aout, "audio mixer", NULL, 0 );
if ( p_aout->mixer.p_module == NULL )
{
msg_Err( p_aout, "no suitable audio mixer" );
return -1;
}
p_aout->mixer.b_error = 0;
return 0;
}
/*****************************************************************************
* aout_MixerDelete: delete the mixer
*****************************************************************************
* Please note that you must hold the mixer lock.
*****************************************************************************/
void aout_MixerDelete( aout_instance_t * p_aout )
{
if ( p_aout->mixer.b_error ) return;
module_Unneed( p_aout, p_aout->mixer.p_module );
p_aout->mixer.b_error = 1;
}
/*****************************************************************************
* MixBuffer: try to prepare one output buffer
*****************************************************************************
* Please note that you must hold the mixer lock.
*****************************************************************************/
static int MixBuffer( aout_instance_t * p_aout )
{
int i, i_first_input = 0;
aout_buffer_t * p_output_buffer;
mtime_t start_date, end_date;
audio_date_t exact_start_date;
if ( p_aout->mixer.b_error )
{
/* Free all incoming buffers. */
aout_lock_input_fifos( p_aout );
for ( i = 0; i < p_aout->i_nb_inputs; i++ )
{
aout_input_t * p_input = p_aout->pp_inputs[i];
aout_buffer_t * p_buffer = p_input->fifo.p_first;
if ( p_input->b_error ) continue;
while ( p_buffer != NULL )
{
aout_buffer_t * p_next = p_buffer->p_next;
aout_BufferFree( p_buffer );
p_buffer = p_next;
}
}
aout_unlock_input_fifos( p_aout );
return -1;
}
aout_lock_output_fifo( p_aout );
aout_lock_input_fifos( p_aout );
/* Retrieve the date of the next buffer. */
memcpy( &exact_start_date, &p_aout->output.fifo.end_date,
sizeof(audio_date_t) );
start_date = aout_DateGet( &exact_start_date );
if ( start_date != 0 && start_date < mdate() )
{
/* The output is _very_ late. This can only happen if the user
* pauses the stream (or if the decoder is buggy, which cannot
* happen :). */
msg_Warn( p_aout, "output PTS is out of range (%"PRId64"), clearing out",
mdate() - start_date );
aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
aout_DateSet( &exact_start_date, 0 );
start_date = 0;
}
aout_unlock_output_fifo( p_aout );
/* See if we have enough data to prepare a new buffer for the audio
* output. First : start date. */
if ( !start_date )
{
/* Find the latest start date available. */
for ( i = 0; i < p_aout->i_nb_inputs; i++ )
{
aout_input_t * p_input = p_aout->pp_inputs[i];
aout_fifo_t * p_fifo = &p_input->fifo;
aout_buffer_t * p_buffer;
if ( p_input->b_error ) continue;
p_buffer = p_fifo->p_first;
while ( p_buffer != NULL && p_buffer->start_date < mdate() )
{
msg_Warn( p_aout, "input PTS is out of range (%"PRId64"), "
"trashing", mdate() - p_buffer->start_date );
p_buffer = aout_FifoPop( p_aout, p_fifo );
aout_BufferFree( p_buffer );
if( p_input->p_input_thread )
{
// stats_UpdateInteger( p_input->p_input_thread,
// "lost_abuffers", 1 );
}
p_buffer = p_fifo->p_first;
p_input->p_first_byte_to_mix = NULL;
}
if ( p_buffer == NULL )
{
break;
}
if ( !start_date || start_date < p_buffer->start_date )
{
aout_DateSet( &exact_start_date, p_buffer->start_date );
start_date = p_buffer->start_date;
}
}
if ( i < p_aout->i_nb_inputs )
{
/* Interrupted before the end... We can't run. */
aout_unlock_input_fifos( p_aout );
return -1;
}
}
aout_DateIncrement( &exact_start_date, p_aout->output.i_nb_samples );
end_date = aout_DateGet( &exact_start_date );
/* Check that start_date and end_date are available for all input
* streams. */
for ( i = 0; i < p_aout->i_nb_inputs; i++ )
{
aout_input_t * p_input = p_aout->pp_inputs[i];
aout_fifo_t * p_fifo = &p_input->fifo;
aout_buffer_t * p_buffer;
mtime_t prev_date;
bool b_drop_buffers;
if ( p_input->b_error )
{
if ( i_first_input == i ) i_first_input++;
continue;
}
p_buffer = p_fifo->p_first;
if ( p_buffer == NULL )
{
break;
}
/* Check for the continuity of start_date */
while ( p_buffer != NULL && p_buffer->end_date < start_date - 1 )
{
/* We authorize a +-1 because rounding errors get compensated
* regularly. */
aout_buffer_t * p_next = p_buffer->p_next;
msg_Warn( p_aout, "the mixer got a packet in the past (%"PRId64")",
start_date - p_buffer->end_date );
aout_BufferFree( p_buffer );
if( p_input->p_input_thread )
{
// stats_UpdateInteger( p_input->p_input_thread,
// "lost_abuffers", 1 );
}
p_fifo->p_first = p_buffer = p_next;
p_input->p_first_byte_to_mix = NULL;
}
if ( p_buffer == NULL )
{
p_fifo->pp_last = &p_fifo->p_first;
break;
}
/* Check that we have enough samples. */
for ( ; ; )
{
p_buffer = p_fifo->p_first;
if ( p_buffer == NULL ) break;
if ( p_buffer->end_date >= end_date ) break;
/* Check that all buffers are contiguous. */
prev_date = p_fifo->p_first->end_date;
p_buffer = p_buffer->p_next;
b_drop_buffers = 0;
for ( ; p_buffer != NULL; p_buffer = p_buffer->p_next )
{
if ( prev_date != p_buffer->start_date )
{
msg_Warn( p_aout,
"buffer hole, dropping packets (%"PRId64")",
p_buffer->start_date - prev_date );
b_drop_buffers = 1;
break;
}
if ( p_buffer->end_date >= end_date ) break;
prev_date = p_buffer->end_date;
}
if ( b_drop_buffers )
{
aout_buffer_t * p_deleted = p_fifo->p_first;
while ( p_deleted != NULL && p_deleted != p_buffer )
{
aout_buffer_t * p_next = p_deleted->p_next;
aout_BufferFree( p_deleted );
p_deleted = p_next;
}
p_fifo->p_first = p_deleted; /* == p_buffer */
}
else break;
}
if ( p_buffer == NULL ) break;
p_buffer = p_fifo->p_first;
if ( !AOUT_FMT_NON_LINEAR( &p_aout->mixer.mixer ) )
{
/* Additionally check that p_first_byte_to_mix is well
* located. */
mtime_t i_nb_bytes = (start_date - p_buffer->start_date)
* p_aout->mixer.mixer.i_bytes_per_frame
* p_aout->mixer.mixer.i_rate
/ p_aout->mixer.mixer.i_frame_length
/ 1000000;
ptrdiff_t mixer_nb_bytes;
if ( p_input->p_first_byte_to_mix == NULL )
{
p_input->p_first_byte_to_mix = p_buffer->p_buffer;
}
mixer_nb_bytes = p_input->p_first_byte_to_mix - p_buffer->p_buffer;
if ( !((i_nb_bytes + p_aout->mixer.mixer.i_bytes_per_frame
> mixer_nb_bytes) &&
(i_nb_bytes < p_aout->mixer.mixer.i_bytes_per_frame
+ mixer_nb_bytes)) )
{
msg_Warn( p_aout, "mixer start isn't output start (%"PRId64")",
i_nb_bytes - mixer_nb_bytes );
/* Round to the nearest multiple */
i_nb_bytes /= p_aout->mixer.mixer.i_bytes_per_frame;
i_nb_bytes *= p_aout->mixer.mixer.i_bytes_per_frame;
if( i_nb_bytes < 0 )
{
/* Is it really the best way to do it ? */
aout_lock_output_fifo( p_aout );
aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
aout_DateSet( &exact_start_date, 0 );
aout_unlock_output_fifo( p_aout );
break;
}
p_input->p_first_byte_to_mix = p_buffer->p_buffer + i_nb_bytes;
}
}
}
if ( i < p_aout->i_nb_inputs || i_first_input == p_aout->i_nb_inputs )
{
/* Interrupted before the end... We can't run. */
aout_unlock_input_fifos( p_aout );
return -1;
}
/* Run the mixer. */
aout_BufferAlloc( &p_aout->mixer.output_alloc,
((uint64_t)p_aout->output.i_nb_samples * 1000000)
/ p_aout->output.output.i_rate,
/* This is a bit kludgy, but is actually only used
* for the S/PDIF dummy mixer : */
p_aout->pp_inputs[i_first_input]->fifo.p_first,
p_output_buffer );
if ( p_output_buffer == NULL )
{
aout_unlock_input_fifos( p_aout );
return -1;
}
/* This is again a bit kludgy - for the S/PDIF mixer. */
if ( p_aout->mixer.output_alloc.i_alloc_type != AOUT_ALLOC_NONE )
{
p_output_buffer->i_nb_samples = p_aout->output.i_nb_samples;
p_output_buffer->i_nb_bytes = p_aout->output.i_nb_samples
* p_aout->mixer.mixer.i_bytes_per_frame
/ p_aout->mixer.mixer.i_frame_length;
}
p_output_buffer->start_date = start_date;
p_output_buffer->end_date = end_date;
p_aout->mixer.pf_do_work( p_aout, p_output_buffer );
aout_unlock_input_fifos( p_aout );
aout_OutputPlay( p_aout, p_output_buffer );
return 0;
}
/*****************************************************************************
* aout_MixerRun: entry point for the mixer & post-filters processing
*****************************************************************************
* Please note that you must hold the mixer lock.
*****************************************************************************/
void aout_MixerRun( aout_instance_t * p_aout )
{
while( MixBuffer( p_aout ) != -1 );
}
/*****************************************************************************
* aout_MixerMultiplierSet: set p_aout->mixer.f_multiplier
*****************************************************************************
* Please note that we assume that you own the mixer lock when entering this
* function. This function returns -1 on error.
*****************************************************************************/
int aout_MixerMultiplierSet( aout_instance_t * p_aout, float f_multiplier )
{
float f_old = p_aout->mixer.f_multiplier;
bool b_new_mixer = 0;
if ( !p_aout->mixer.b_error )
{
aout_MixerDelete( p_aout );
b_new_mixer = 1;
}
p_aout->mixer.f_multiplier = f_multiplier;
if ( b_new_mixer && aout_MixerNew( p_aout ) )
{
p_aout->mixer.f_multiplier = f_old;
aout_MixerNew( p_aout );
return -1;
}
return 0;
}
/*****************************************************************************
* aout_MixerMultiplierGet: get p_aout->mixer.f_multiplier
*****************************************************************************
* Please note that we assume that you own the mixer lock when entering this
* function. This function returns -1 on error.
*****************************************************************************/
int aout_MixerMultiplierGet( aout_instance_t * p_aout, float * pf_multiplier )
{
*pf_multiplier = p_aout->mixer.f_multiplier;
return 0;
}
