output.c 9.78 KB
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/*****************************************************************************
 * output.c : internal management of output streams for the audio output
 *****************************************************************************
 * Copyright (C) 2002 VideoLAN
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 * $Id: output.c,v 1.15 2002/09/26 22:40:25 massiot Exp $
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 *
 * 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>

#include "audio_output.h"
#include "aout_internal.h"

/*****************************************************************************
 * aout_OutputNew : allocate a new output and rework the filter pipeline
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 *****************************************************************************
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 * This function is entered with the mixer lock.
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 *****************************************************************************/
int aout_OutputNew( aout_instance_t * p_aout,
                    audio_sample_format_t * p_format )
{
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    /* Retrieve user defaults. */
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    char * psz_name = config_GetPsz( p_aout, "aout" );
    int i_rate = config_GetInt( p_aout, "aout-rate" );
    int i_channels = config_GetInt( p_aout, "aout-channels" );

    memcpy( &p_aout->output.output, p_format, sizeof(audio_sample_format_t) );
    if ( i_rate != -1 ) p_aout->output.output.i_rate = i_rate;
    if ( i_channels != -1 ) p_aout->output.output.i_channels = i_channels;
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    if ( AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
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    {
        p_aout->output.output.i_format = AOUT_FMT_SPDIF;
    }
    else
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    {
        /* Non-S/PDIF mixer only deals with float32 or fixed32. */
        p_aout->output.output.i_format
                     = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
                        AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
    }
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    aout_FormatPrepare( &p_aout->output.output );
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    vlc_mutex_lock( &p_aout->output_fifo_lock );

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    /* Find the best output plug-in. */
    p_aout->output.p_module = module_Need( p_aout, "audio output",
                                           psz_name );
    if ( psz_name != NULL ) free( psz_name );
    if ( p_aout->output.p_module == NULL )
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    {
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        msg_Err( p_aout, "no suitable aout module" );
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        vlc_mutex_unlock( &p_aout->output_fifo_lock );
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        return -1;
    }
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    aout_FormatPrepare( &p_aout->output.output );
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    /* Prepare FIFO. */
    aout_FifoInit( p_aout, &p_aout->output.fifo, p_aout->output.output.i_rate );

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    vlc_mutex_unlock( &p_aout->output_fifo_lock );

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    msg_Dbg( p_aout, "output format=%d rate=%d channels=%d",
             p_aout->output.output.i_format, p_aout->output.output.i_rate,
             p_aout->output.output.i_channels );

    /* Calculate the resulting mixer output format. */
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    memcpy( &p_aout->mixer.mixer, &p_aout->output.output,
            sizeof(audio_sample_format_t) );
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    if ( !AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
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    {
        /* Non-S/PDIF mixer only deals with float32 or fixed32. */
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        p_aout->mixer.mixer.i_format
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                     = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
                        AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
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        aout_FormatPrepare( &p_aout->mixer.mixer );
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    }
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    else
    {
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        p_aout->mixer.mixer.i_format = p_format->i_format;
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    }

    msg_Dbg( p_aout, "mixer format=%d rate=%d channels=%d",
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             p_aout->mixer.mixer.i_format, p_aout->mixer.mixer.i_rate,
             p_aout->mixer.mixer.i_channels );
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    /* Create filters. */
    if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
                                     &p_aout->output.i_nb_filters,
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                                     &p_aout->mixer.mixer,
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                                     &p_aout->output.output ) < 0 )
    {
        msg_Err( p_aout, "couldn't set an output pipeline" );
        module_Unneed( p_aout, p_aout->output.p_module );
        return -1;
    }

    /* Prepare hints for the buffer allocator. */
    p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
    p_aout->mixer.output_alloc.i_bytes_per_sec
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                        = p_aout->mixer.mixer.i_bytes_per_frame
                           * p_aout->mixer.mixer.i_rate
                           / p_aout->mixer.mixer.i_frame_length;
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    aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
                             p_aout->output.i_nb_filters,
                             &p_aout->mixer.output_alloc );

    return 0;
}

/*****************************************************************************
 * aout_OutputDelete : delete the output
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 *****************************************************************************
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 * This function is entered with the mixer lock.
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 *****************************************************************************/
void aout_OutputDelete( aout_instance_t * p_aout )
{
    module_Unneed( p_aout, p_aout->output.p_module );

    aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
                                 p_aout->output.i_nb_filters );
    aout_FifoDestroy( p_aout, &p_aout->output.fifo );
}

/*****************************************************************************
 * aout_OutputPlay : play a buffer
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 *****************************************************************************
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 * This function is entered with the mixer lock.
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 *****************************************************************************/
void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
{
    aout_FiltersPlay( p_aout, p_aout->output.pp_filters,
                      p_aout->output.i_nb_filters,
                      &p_buffer );

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    vlc_mutex_lock( &p_aout->output_fifo_lock );
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    aout_FifoPush( p_aout, &p_aout->output.fifo, p_buffer );
    p_aout->output.pf_play( p_aout );
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    vlc_mutex_unlock( &p_aout->output_fifo_lock );
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}

/*****************************************************************************
 * aout_OutputNextBuffer : give the audio output plug-in the right buffer
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 *****************************************************************************
 * If b_can_sleek is 1, the aout core functions won't try to resample
 * new buffers to catch up - that is we suppose that the output plug-in can
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 * compensate it by itself. S/PDIF outputs should always set b_can_sleek = 1.
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 * This function is entered with no lock at all :-).
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 *****************************************************************************/
aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
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                                       mtime_t start_date,
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                                       vlc_bool_t b_can_sleek )
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{
    aout_buffer_t * p_buffer;

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    vlc_mutex_lock( &p_aout->output_fifo_lock );
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    p_buffer = p_aout->output.fifo.p_first;
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    while ( p_buffer && p_buffer->start_date < start_date )
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    {
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        msg_Dbg( p_aout, "audio output is too slow (%lld), trashing %lldus",
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                 start_date - p_buffer->start_date,
                 p_buffer->end_date - p_buffer->start_date );
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        p_buffer = p_buffer->p_next;
    }

    p_aout->output.fifo.p_first = p_buffer;
    if ( p_buffer == NULL )
    {
        p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
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        /* Set date to 0, to allow the mixer to send a new buffer ASAP */
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        aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
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        vlc_mutex_unlock( &p_aout->output_fifo_lock );
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        msg_Dbg( p_aout,
                 "audio output is starving (no input), playing silence" );
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        return NULL;
    }

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    /* Here we suppose that all buffers have the same duration - this is
     * generally true, and anyway if it's wrong it won't be a disaster. */
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    if ( p_buffer->start_date > start_date
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                         + (p_buffer->end_date - p_buffer->start_date) )
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    {
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        vlc_mutex_unlock( &p_aout->output_fifo_lock );
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        msg_Dbg( p_aout, "audio output is starving (%lld), playing silence",
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                 p_buffer->start_date - start_date );
        return NULL;
    }

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    if ( !b_can_sleek &&
          ( (p_buffer->start_date - start_date > AOUT_PTS_TOLERANCE)
             || (start_date - p_buffer->start_date > AOUT_PTS_TOLERANCE) ) )
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    {
        /* Try to compensate the drift by doing some resampling. */
        int i;
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        mtime_t difference = p_buffer->start_date - start_date;
        msg_Warn( p_aout, "output date isn't PTS date, resampling (%lld)",
                  difference );
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        vlc_mutex_lock( &p_aout->input_fifos_lock );
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        for ( i = 0; i < p_aout->i_nb_inputs; i++ )
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        {
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            aout_fifo_t * p_fifo = &p_aout->pp_inputs[i]->fifo;

            aout_FifoMoveDates( p_aout, p_fifo, difference );
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        }
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        aout_FifoMoveDates( p_aout, &p_aout->output.fifo, difference );
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        vlc_mutex_unlock( &p_aout->input_fifos_lock );
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    }
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    p_aout->output.fifo.p_first = p_buffer->p_next;
    if ( p_buffer->p_next == NULL )
    {
        p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
    }

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    vlc_mutex_unlock( &p_aout->output_fifo_lock );
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    return p_buffer;
}