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VLC Source 0.5.3.dmg
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audio_output
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input.c
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/*****************************************************************************
* input.c : internal management of input streams for the audio output
*****************************************************************************
* Copyright (C) 2002 VideoLAN
* $Id: input.c,v 1.34 2003/04/06 23:44:53 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"
/*****************************************************************************
* aout_InputNew : allocate a new input and rework the filter pipeline
*****************************************************************************/
int aout_InputNew( aout_instance_t * p_aout, aout_input_t * p_input )
{
audio_sample_format_t intermediate_format, headphone_intermediate_format;
aout_filter_t * p_headphone_filter;
vlc_bool_t b_use_headphone_filter = VLC_FALSE;
aout_FormatPrint( p_aout, "input", &p_input->input );
/* Prepare FIFO. */
aout_FifoInit( p_aout, &p_input->fifo, p_aout->mixer.mixer.i_rate );
p_input->p_first_byte_to_mix = NULL;
/* Prepare format structure */
memcpy( &intermediate_format, &p_aout->mixer.mixer,
sizeof(audio_sample_format_t) );
intermediate_format.i_rate = p_input->input.i_rate;
/* Headphone filter add-ons. */
memcpy( &headphone_intermediate_format, &p_aout->mixer.mixer,
sizeof(audio_sample_format_t) );
headphone_intermediate_format.i_rate = p_input->input.i_rate;
if ( config_GetInt( p_aout , "headphone-opt" ) )
{
/* Do we use heaphone filter ? */
if ( intermediate_format.i_physical_channels
== ( AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT )
&& ( intermediate_format.i_format != VLC_FOURCC('f','l','3','2')
|| intermediate_format.i_format != VLC_FOURCC('f','i','3','2')
) )
{
b_use_headphone_filter = VLC_TRUE;
}
}
if ( b_use_headphone_filter == VLC_TRUE )
{
/* Split the filter pipeline. */
headphone_intermediate_format.i_physical_channels = p_input->input.i_physical_channels;
headphone_intermediate_format.i_original_channels = p_input->input.i_original_channels;
headphone_intermediate_format.i_bytes_per_frame =
headphone_intermediate_format.i_bytes_per_frame
* aout_FormatNbChannels( &headphone_intermediate_format )
/ aout_FormatNbChannels( &intermediate_format );
}
/* Create filters. */
if ( aout_FiltersCreatePipeline( p_aout, p_input->pp_filters,
&p_input->i_nb_filters, &p_input->input,
&headphone_intermediate_format ) < 0 )
{
msg_Err( p_aout, "couldn't set an input pipeline" );
aout_FifoDestroy( p_aout, &p_input->fifo );
p_input->b_error = 1;
return -1;
}
/* Headphone filter add-ons. */
if ( b_use_headphone_filter == VLC_TRUE )
{
/* create a vlc object */
p_headphone_filter = vlc_object_create( p_aout
, sizeof(aout_filter_t) );
if ( p_headphone_filter == NULL )
{
msg_Err( p_aout, "couldn't open the headphone virtual spatialization module" );
aout_FifoDestroy( p_aout, &p_input->fifo );
p_input->b_error = 1;
return -1;
}
vlc_object_attach( p_headphone_filter, p_aout );
/* find the headphone filter */
memcpy( &p_headphone_filter->input, &headphone_intermediate_format
, sizeof(audio_sample_format_t) );
memcpy( &p_headphone_filter->output, &intermediate_format
, sizeof(audio_sample_format_t) );
p_headphone_filter->p_module = module_Need( p_headphone_filter, "audio filter"
, "headphone" );
if ( p_headphone_filter->p_module == NULL )
{
vlc_object_detach( p_headphone_filter );
vlc_object_destroy( p_headphone_filter );
msg_Err( p_aout, "couldn't open the headphone virtual spatialization module" );
aout_FifoDestroy( p_aout, &p_input->fifo );
p_input->b_error = 1;
return -1;
}
/* success */
p_headphone_filter->b_continuity = VLC_FALSE;
p_input->pp_filters[p_input->i_nb_filters++] = p_headphone_filter;
}
/* Prepare hints for the buffer allocator. */
p_input->input_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
p_input->input_alloc.i_bytes_per_sec = -1;
if ( AOUT_FMT_NON_LINEAR( &p_aout->mixer.mixer ) )
{
p_input->i_nb_resamplers = 0;
}
else
{
/* Create resamplers. */
intermediate_format.i_rate = (__MAX(p_input->input.i_rate,
p_aout->mixer.mixer.i_rate)
* (100 + AOUT_MAX_RESAMPLING)) / 100;
if ( intermediate_format.i_rate == p_aout->mixer.mixer.i_rate )
{
/* Just in case... */
intermediate_format.i_rate++;
}
if ( aout_FiltersCreatePipeline( p_aout, p_input->pp_resamplers,
&p_input->i_nb_resamplers,
&intermediate_format,
&p_aout->mixer.mixer ) < 0 )
{
msg_Err( p_aout, "couldn't set a resampler pipeline" );
aout_FiltersDestroyPipeline( p_aout, p_input->pp_filters,
p_input->i_nb_filters );
aout_FifoDestroy( p_aout, &p_input->fifo );
p_input->b_error = 1;
return -1;
}
aout_FiltersHintBuffers( p_aout, p_input->pp_resamplers,
p_input->i_nb_resamplers,
&p_input->input_alloc );
/* Setup the initial rate of the resampler */
p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
}
p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
p_input->input_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
aout_FiltersHintBuffers( p_aout, p_input->pp_filters,
p_input->i_nb_filters,
&p_input->input_alloc );
/* i_bytes_per_sec is still == -1 if no filters */
p_input->input_alloc.i_bytes_per_sec = __MAX(
p_input->input_alloc.i_bytes_per_sec,
(int)(p_input->input.i_bytes_per_frame
* p_input->input.i_rate
/ p_input->input.i_frame_length) );
/* Allocate in the heap, it is more convenient for the decoder. */
p_input->input_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
p_input->b_error = 0;
return 0;
}
/*****************************************************************************
* aout_InputDelete : delete an input
*****************************************************************************
* This function must be entered with the mixer lock.
*****************************************************************************/
int aout_InputDelete( aout_instance_t * p_aout, aout_input_t * p_input )
{
if ( p_input->b_error ) return 0;
aout_FiltersDestroyPipeline( p_aout, p_input->pp_filters,
p_input->i_nb_filters );
aout_FiltersDestroyPipeline( p_aout, p_input->pp_resamplers,
p_input->i_nb_resamplers );
aout_FifoDestroy( p_aout, &p_input->fifo );
return 0;
}
/*****************************************************************************
* aout_InputPlay : play a buffer
*****************************************************************************
* This function must be entered with the input lock.
*****************************************************************************/
int aout_InputPlay( aout_instance_t * p_aout, aout_input_t * p_input,
aout_buffer_t * p_buffer )
{
mtime_t start_date;
/* We don't care if someone changes the start date behind our back after
* this. We'll deal with that when pushing the buffer, and compensate
* with the next incoming buffer. */
vlc_mutex_lock( &p_aout->input_fifos_lock );
start_date = aout_FifoNextStart( p_aout, &p_input->fifo );
vlc_mutex_unlock( &p_aout->input_fifos_lock );
if ( start_date != 0 && start_date < mdate() )
{
/* The decoder 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, "computed PTS is out of range ("I64Fd"), "
"clearing out", mdate() - start_date );
vlc_mutex_lock( &p_aout->input_fifos_lock );
aout_FifoSet( p_aout, &p_input->fifo, 0 );
p_input->p_first_byte_to_mix = NULL;
vlc_mutex_unlock( &p_aout->input_fifos_lock );
if ( p_input->i_resampling_type != AOUT_RESAMPLING_NONE )
msg_Warn( p_aout, "timing screwed, stopping resampling" );
p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
if ( p_input->i_nb_resamplers != 0 )
{
p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
p_input->pp_resamplers[0]->b_continuity = VLC_FALSE;
}
start_date = 0;
}
if ( p_buffer->start_date < mdate() + AOUT_MIN_PREPARE_TIME )
{
/* The decoder gives us f*cked up PTS. It's its business, but we
* can't present it anyway, so drop the buffer. */
msg_Warn( p_aout, "PTS is out of range ("I64Fd"), dropping buffer",
mdate() - p_buffer->start_date );
aout_BufferFree( p_buffer );
p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
if ( p_input->i_nb_resamplers != 0 )
{
p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
p_input->pp_resamplers[0]->b_continuity = VLC_FALSE;
}
return 0;
}
if ( start_date == 0 ) start_date = p_buffer->start_date;
/* Run pre-filters. */
aout_FiltersPlay( p_aout, p_input->pp_filters, p_input->i_nb_filters,
&p_buffer );
/* Run the resampler if needed.
* We first need to calculate the output rate of this resampler. */
if ( ( p_input->i_resampling_type == AOUT_RESAMPLING_NONE ) &&
( start_date < p_buffer->start_date - AOUT_PTS_TOLERANCE
|| start_date > p_buffer->start_date + AOUT_PTS_TOLERANCE ) &&
p_input->i_nb_resamplers > 0 )
{
/* Can happen in several circumstances :
* 1. A problem at the input (clock drift)
* 2. A small pause triggered by the user
* 3. Some delay in the output stage, causing a loss of lip
* synchronization
* Solution : resample the buffer to avoid a scratch.
*/
mtime_t drift = p_buffer->start_date - start_date;
p_input->i_resamp_start_date = mdate();
p_input->i_resamp_start_drift = (int)drift;
if ( drift > 0 )
p_input->i_resampling_type = AOUT_RESAMPLING_DOWN;
else
p_input->i_resampling_type = AOUT_RESAMPLING_UP;
msg_Warn( p_aout, "buffer is "I64Fd" %s, triggering %ssampling",
drift > 0 ? drift : -drift,
drift > 0 ? "in advance" : "late",
drift > 0 ? "down" : "up");
}
if ( p_input->i_resampling_type != AOUT_RESAMPLING_NONE )
{
/* Resampling has been triggered previously (because of dates
* mismatch). We want the resampling to happen progressively so
* it isn't too audible to the listener. */
if( p_input->i_resampling_type == AOUT_RESAMPLING_UP )
{
p_input->pp_resamplers[0]->input.i_rate += 10; /* Hz */
}
else
{
p_input->pp_resamplers[0]->input.i_rate -= 10; /* Hz */
}
/* Check if everything is back to normal, in which case we can stop the
* resampling */
if( p_input->pp_resamplers[0]->input.i_rate ==
p_input->input.i_rate )
{
p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
msg_Warn( p_aout, "resampling stopped after "I64Fi" usec",
mdate() - p_input->i_resamp_start_date );
}
else if( abs( (int)(p_buffer->start_date - start_date) ) <
abs( p_input->i_resamp_start_drift ) / 2 )
{
/* if we reduced the drift from half, then it is time to switch
* back the resampling direction. */
if( p_input->i_resampling_type == AOUT_RESAMPLING_UP )
p_input->i_resampling_type = AOUT_RESAMPLING_DOWN;
else
p_input->i_resampling_type = AOUT_RESAMPLING_UP;
p_input->i_resamp_start_drift = 0;
}
else if( p_input->i_resamp_start_drift &&
( abs( (int)(p_buffer->start_date - start_date) ) >
abs( p_input->i_resamp_start_drift ) * 3 / 2 ) )
{
/* If the drift is increasing and not decreasing, than something
* is bad. We'd better stop the resampling right now. */
msg_Warn( p_aout, "timing screwed, stopping resampling" );
p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
}
}
/* Adding the start date will be managed by aout_FifoPush(). */
p_buffer->end_date = start_date +
(p_buffer->end_date - p_buffer->start_date);
p_buffer->start_date = start_date;
/* Actually run the resampler now. */
if ( p_input->i_nb_resamplers > 0 )
{
aout_FiltersPlay( p_aout, p_input->pp_resamplers,
p_input->i_nb_resamplers,
&p_buffer );
}
vlc_mutex_lock( &p_aout->input_fifos_lock );
aout_FifoPush( p_aout, &p_input->fifo, p_buffer );
vlc_mutex_unlock( &p_aout->input_fifos_lock );
return 0;
}