+++ /dev/null
-/*****************************************************************************
- * audio_output.c : audio output instance miscellaneous functions
- *****************************************************************************
- * Copyright (C) 2002 VideoLAN
- * $Id: audio_output.c,v 1.103 2002/09/20 23:27:04 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>
-
-#ifdef HAVE_ALLOCA_H
-# include <alloca.h>
-#endif
-
-#include "audio_output.h"
-#include "aout_internal.h"
-
-/*
- * Instances management (see also input.c:aout_InputNew())
- */
-
-/*****************************************************************************
- * aout_NewInstance: initialize aout structure
- *****************************************************************************/
-aout_instance_t * __aout_NewInstance( vlc_object_t * p_parent )
-{
- aout_instance_t * p_aout;
-
- /* 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;
-
- vlc_object_attach( p_aout, p_parent->p_vlc );
-
- return p_aout;
-}
-
-/*****************************************************************************
- * aout_DeleteInstance: destroy aout structure
- *****************************************************************************/
-void aout_DeleteInstance( aout_instance_t * p_aout )
-{
- 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 );
-}
-
-
-/*
- * Buffer management (interface to the decoders)
- */
-
-/*****************************************************************************
- * aout_BufferNew : ask for a new empty buffer
- *****************************************************************************/
-aout_buffer_t * aout_BufferNew( aout_instance_t * p_aout,
- aout_input_t * p_input,
- size_t i_nb_samples )
-{
- aout_buffer_t * p_buffer;
- mtime_t 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;
-
- if ( p_buffer == NULL )
- {
- msg_Err( p_aout, "NULL buffer !" );
- }
- else
- {
- p_buffer->start_date = p_buffer->end_date = 0;
- }
-
- return p_buffer;
-}
-
-/*****************************************************************************
- * aout_BufferDelete : destroy an undecoded buffer
- *****************************************************************************/
-void aout_BufferDelete( aout_instance_t * p_aout, aout_input_t * p_input,
- aout_buffer_t * p_buffer )
-{
- aout_BufferFree( p_buffer );
-}
-
-/*****************************************************************************
- * aout_BufferPlay : filter & mix the decoded buffer
- *****************************************************************************/
-int aout_BufferPlay( 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 );
- }
- else
- {
- p_buffer->end_date = p_buffer->start_date
- + (mtime_t)(p_buffer->i_nb_samples * 1000000)
- / p_input->input.i_rate;
- }
-
- /* 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 ) return -1;
-
- /* Run the mixer if it is able to run. */
- aout_MixerRun( p_aout );
-}
-
-
-/*
- * Formats management
- */
-
-/*****************************************************************************
- * aout_FormatNbChannels : return the number of channels
- *****************************************************************************/
-int aout_FormatNbChannels( audio_sample_format_t * p_format )
-{
- int i_nb;
-
- switch ( p_format->i_channels & AOUT_CHAN_MASK )
- {
- case AOUT_CHAN_CHANNEL1:
- case AOUT_CHAN_CHANNEL2:
- case AOUT_CHAN_MONO:
- i_nb = 1;
- break;
-
- case AOUT_CHAN_CHANNEL:
- case AOUT_CHAN_STEREO:
- case AOUT_CHAN_DOLBY:
- i_nb = 2;
- break;
-
- case AOUT_CHAN_3F:
- case AOUT_CHAN_2F1R:
- i_nb = 3;
- break;
-
- case AOUT_CHAN_3F1R:
- case AOUT_CHAN_2F2R:
- i_nb = 4;
- break;
-
- case AOUT_CHAN_3F2R:
- i_nb = 5;
- break;
-
- default:
- i_nb = 0;
- }
-
- if ( p_format->i_channels & AOUT_CHAN_LFE )
- return i_nb + 1;
- else
- 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 AOUT_FMT_U8:
- case AOUT_FMT_S8:
- i_result = 1;
- break;
-
- case AOUT_FMT_U16_LE:
- case AOUT_FMT_U16_BE:
- case AOUT_FMT_S16_LE:
- case AOUT_FMT_S16_BE:
- i_result = 2;
- break;
-
- case AOUT_FMT_FLOAT32:
- case AOUT_FMT_FIXED32:
- i_result = 4;
- break;
-
- case AOUT_FMT_SPDIF:
- case AOUT_FMT_A52:
- case AOUT_FMT_DTS:
- /* For these formats the caller has to indicate the parameters
- * by hand. */
- return;
-
- default:
- i_result = 0; /* will segfault much sooner... */
- }
-
- p_format->i_bytes_per_frame = i_result * aout_FormatNbChannels( p_format );
- p_format->i_frame_length = 1;
-}
-
-
-/*
- * 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,
- u32 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_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, u32 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, u32 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 += 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;
-}
-
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