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audio_output
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common.c
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2003-04-07
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/*****************************************************************************
* common.c : audio output management of common data structures
*****************************************************************************
* Copyright (C) 2002 VideoLAN
* $Id: common.c,v 1.17 2003/02/11 11:16:04 massiot 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>
#include "audio_output.h"
#include "aout_internal.h"
/*
* Instances management (internal and external)
*/
/*****************************************************************************
* aout_New: initialize aout structure
*****************************************************************************/
aout_instance_t * __aout_New( vlc_object_t * p_parent )
{
aout_instance_t * p_aout;
vlc_value_t val;
/* Allocate descriptor. */
p_aout = vlc_object_create( p_parent, VLC_OBJECT_AOUT );
if( p_aout == NULL )
{
return NULL;
}
/* Initialize members. */
vlc_mutex_init( p_parent, &p_aout->input_fifos_lock );
vlc_mutex_init( p_parent, &p_aout->mixer_lock );
vlc_mutex_init( p_parent, &p_aout->output_fifo_lock );
p_aout->i_nb_inputs = 0;
p_aout->mixer.f_multiplier = 1.0;
p_aout->mixer.b_error = 1;
p_aout->output.b_error = 1;
p_aout->output.b_starving = 1;
var_Create( p_aout, "intf-change", VLC_VAR_BOOL );
val.b_bool = VLC_TRUE;
var_Set( p_aout, "intf-change", val );
vlc_object_attach( p_aout, p_parent->p_vlc );
return p_aout;
}
/*****************************************************************************
* aout_Delete: destroy aout structure
*****************************************************************************/
void aout_Delete( aout_instance_t * p_aout )
{
var_Destroy( p_aout, "intf-change" );
vlc_mutex_destroy( &p_aout->input_fifos_lock );
vlc_mutex_destroy( &p_aout->mixer_lock );
vlc_mutex_destroy( &p_aout->output_fifo_lock );
/* Free structure. */
vlc_object_destroy( p_aout );
}
/*
* Formats management (internal and external)
*/
/*****************************************************************************
* aout_FormatNbChannels : return the number of channels
*****************************************************************************/
unsigned int aout_FormatNbChannels( const audio_sample_format_t * p_format )
{
static const uint32_t pi_channels[] =
{ AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
AOUT_CHAN_REARCENTER, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT, AOUT_CHAN_LFE };
unsigned int i_nb = 0, i;
for ( i = 0; i < sizeof(pi_channels)/sizeof(uint32_t); i++ )
{
if ( p_format->i_physical_channels & pi_channels[i] ) i_nb++;
}
return i_nb;
}
/*****************************************************************************
* aout_FormatPrepare : compute the number of bytes per frame & frame length
*****************************************************************************/
void aout_FormatPrepare( audio_sample_format_t * p_format )
{
int i_result;
switch ( p_format->i_format )
{
case VLC_FOURCC('u','8',' ',' '):
case VLC_FOURCC('s','8',' ',' '):
i_result = 1;
break;
case VLC_FOURCC('u','1','6','l'):
case VLC_FOURCC('s','1','6','l'):
case VLC_FOURCC('u','1','6','b'):
case VLC_FOURCC('s','1','6','b'):
i_result = 2;
break;
case VLC_FOURCC('f','l','3','2'):
case VLC_FOURCC('f','i','3','2'):
i_result = 4;
break;
case VLC_FOURCC('s','p','d','i'):
case VLC_FOURCC('a','5','2',' '):
case VLC_FOURCC('d','t','s',' '):
case VLC_FOURCC('m','p','g','a'):
case VLC_FOURCC('m','p','g','3'):
default:
/* For these formats the caller has to indicate the parameters
* by hand. */
return;
}
p_format->i_bytes_per_frame = i_result * aout_FormatNbChannels( p_format );
p_format->i_frame_length = 1;
}
/*****************************************************************************
* aout_FormatPrintChannels : print a channel in a human-readable form
*****************************************************************************/
const char * aout_FormatPrintChannels( const audio_sample_format_t * p_format )
{
switch ( p_format->i_physical_channels & AOUT_CHAN_PHYSMASK )
{
case AOUT_CHAN_CENTER:
if ( (p_format->i_original_channels & AOUT_CHAN_CENTER)
|| (p_format->i_original_channels
& (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
return "Mono";
else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
return "Left";
return "Right";
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT:
if ( p_format->i_original_channels & AOUT_CHAN_REVERSESTEREO )
{
if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
return "Dolby/Reverse";
return "Stereo/Reverse";
}
else
{
if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
return "Dolby";
else if ( p_format->i_original_channels & AOUT_CHAN_DUALMONO )
return "Dual-mono";
else if ( p_format->i_original_channels == AOUT_CHAN_CENTER )
return "Stereo/Mono";
else if ( !(p_format->i_original_channels & AOUT_CHAN_RIGHT) )
return "Stereo/Left";
else if ( !(p_format->i_original_channels & AOUT_CHAN_LEFT) )
return "Stereo/Right";
return "Stereo";
}
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER:
return "3F";
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER:
return "2F1R";
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
| AOUT_CHAN_REARCENTER:
return "3F1R";
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
return "2F2R";
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
return "3F2R";
case AOUT_CHAN_CENTER | AOUT_CHAN_LFE:
if ( (p_format->i_original_channels & AOUT_CHAN_CENTER)
|| (p_format->i_original_channels
& (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
return "Mono/LFE";
else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
return "Left/LFE";
return "Right/LFE";
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE:
if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
return "Dolby/LFE";
else if ( p_format->i_original_channels & AOUT_CHAN_DUALMONO )
return "Dual-mono/LFE";
else if ( p_format->i_original_channels == AOUT_CHAN_CENTER )
return "Mono/LFE";
else if ( !(p_format->i_original_channels & AOUT_CHAN_RIGHT) )
return "Stereo/Left/LFE";
else if ( !(p_format->i_original_channels & AOUT_CHAN_LEFT) )
return "Stereo/Right/LFE";
return "Stereo/LFE";
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_LFE:
return "3F/LFE";
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER
| AOUT_CHAN_LFE:
return "2F1R/LFE";
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
| AOUT_CHAN_REARCENTER | AOUT_CHAN_LFE:
return "3F1R/LFE";
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
return "2F2R/LFE";
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
return "3F2R/LFE";
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT
| AOUT_CHAN_MIDDLERIGHT:
return "3F2M2R";
case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT
| AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE:
return "3F2M2R/LFE";
}
return "ERROR";
}
/*****************************************************************************
* aout_FormatPrint : print a format in a human-readable form
*****************************************************************************/
void aout_FormatPrint( aout_instance_t * p_aout, const char * psz_text,
const audio_sample_format_t * p_format )
{
msg_Dbg( p_aout, "%s '%4.4s' %d Hz %s frame=%d samples/%d bytes", psz_text,
(char *)&p_format->i_format, p_format->i_rate,
aout_FormatPrintChannels( p_format ),
p_format->i_frame_length, p_format->i_bytes_per_frame );
}
/*****************************************************************************
* aout_FormatsPrint : print two formats in a human-readable form
*****************************************************************************/
void aout_FormatsPrint( aout_instance_t * p_aout, const char * psz_text,
const audio_sample_format_t * p_format1,
const audio_sample_format_t * p_format2 )
{
msg_Dbg( p_aout, "%s '%4.4s'->'%4.4s' %d Hz->%d Hz %s->%s",
psz_text,
(char *)&p_format1->i_format, (char *)&p_format2->i_format,
p_format1->i_rate, p_format2->i_rate,
aout_FormatPrintChannels( p_format1 ),
aout_FormatPrintChannels( p_format2 ) );
}
/*
* FIFO management (internal) - please understand that solving race conditions
* is _your_ job, ie. in the audio output you should own the mixer lock
* before calling any of these functions.
*/
/*****************************************************************************
* aout_FifoInit : initialize the members of a FIFO
*****************************************************************************/
void aout_FifoInit( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
uint32_t i_rate )
{
p_fifo->p_first = NULL;
p_fifo->pp_last = &p_fifo->p_first;
aout_DateInit( &p_fifo->end_date, i_rate );
}
/*****************************************************************************
* aout_FifoPush : push a packet into the FIFO
*****************************************************************************/
void aout_FifoPush( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
aout_buffer_t * p_buffer )
{
*p_fifo->pp_last = p_buffer;
p_fifo->pp_last = &p_buffer->p_next;
*p_fifo->pp_last = NULL;
/* Enforce the continuity of the stream. */
if ( aout_DateGet( &p_fifo->end_date ) )
{
p_buffer->start_date = aout_DateGet( &p_fifo->end_date );
p_buffer->end_date = aout_DateIncrement( &p_fifo->end_date,
p_buffer->i_nb_samples );
}
else
{
aout_DateSet( &p_fifo->end_date, p_buffer->end_date );
}
}
/*****************************************************************************
* aout_FifoSet : set end_date and trash all buffers (because they aren't
* properly dated)
*****************************************************************************/
void aout_FifoSet( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
mtime_t date )
{
aout_buffer_t * p_buffer;
aout_DateSet( &p_fifo->end_date, date );
p_buffer = p_fifo->p_first;
while ( p_buffer != NULL )
{
aout_buffer_t * p_next = p_buffer->p_next;
aout_BufferFree( p_buffer );
p_buffer = p_next;
}
p_fifo->p_first = NULL;
p_fifo->pp_last = &p_fifo->p_first;
}
/*****************************************************************************
* aout_FifoMoveDates : Move forwards or backwards all dates in the FIFO
*****************************************************************************/
void aout_FifoMoveDates( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
mtime_t difference )
{
aout_buffer_t * p_buffer;
aout_DateMove( &p_fifo->end_date, difference );
p_buffer = p_fifo->p_first;
while ( p_buffer != NULL )
{
p_buffer->start_date += difference;
p_buffer->end_date += difference;
p_buffer = p_buffer->p_next;
}
}
/*****************************************************************************
* aout_FifoNextStart : return the current end_date
*****************************************************************************/
mtime_t aout_FifoNextStart( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
{
return aout_DateGet( &p_fifo->end_date );
}
/*****************************************************************************
* aout_FifoFirstDate : return the playing date of the first buffer in the
* FIFO
*****************************************************************************/
mtime_t aout_FifoFirstDate( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
{
return p_fifo->p_first ? p_fifo->p_first->start_date : 0;
}
/*****************************************************************************
* aout_FifoPop : get the next buffer out of the FIFO
*****************************************************************************/
aout_buffer_t * aout_FifoPop( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
{
aout_buffer_t * p_buffer;
p_buffer = p_fifo->p_first;
if ( p_buffer == NULL ) return NULL;
p_fifo->p_first = p_buffer->p_next;
if ( p_fifo->p_first == NULL )
{
p_fifo->pp_last = &p_fifo->p_first;
}
return p_buffer;
}
/*****************************************************************************
* aout_FifoDestroy : destroy a FIFO and its buffers
*****************************************************************************/
void aout_FifoDestroy( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
{
aout_buffer_t * p_buffer;
p_buffer = p_fifo->p_first;
while ( p_buffer != NULL )
{
aout_buffer_t * p_next = p_buffer->p_next;
aout_BufferFree( p_buffer );
p_buffer = p_next;
}
}
/*
* Date management (internal and external)
*/
/*****************************************************************************
* aout_DateInit : set the divider of an audio_date_t
*****************************************************************************/
void aout_DateInit( audio_date_t * p_date, uint32_t i_divider )
{
p_date->date = 0;
p_date->i_divider = i_divider;
p_date->i_remainder = 0;
}
/*****************************************************************************
* aout_DateSet : set the date of an audio_date_t
*****************************************************************************/
void aout_DateSet( audio_date_t * p_date, mtime_t new_date )
{
p_date->date = new_date;
p_date->i_remainder = 0;
}
/*****************************************************************************
* aout_DateMove : move forwards or backwards the date of an audio_date_t
*****************************************************************************/
void aout_DateMove( audio_date_t * p_date, mtime_t difference )
{
p_date->date += difference;
}
/*****************************************************************************
* aout_DateGet : get the date of an audio_date_t
*****************************************************************************/
mtime_t aout_DateGet( const audio_date_t * p_date )
{
return p_date->date;
}
/*****************************************************************************
* aout_DateIncrement : increment the date and return the result, taking
* into account rounding errors
*****************************************************************************/
mtime_t aout_DateIncrement( audio_date_t * p_date, uint32_t i_nb_samples )
{
mtime_t i_dividend = (mtime_t)i_nb_samples * 1000000;
p_date->date += i_dividend / p_date->i_divider;
p_date->i_remainder += (int)(i_dividend % p_date->i_divider);
if ( p_date->i_remainder >= p_date->i_divider )
{
/* This is Bresenham algorithm. */
p_date->date++;
p_date->i_remainder -= p_date->i_divider;
}
return p_date->date;
}