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vlc/include/aout_internal.h
Derk-Jan Hartman b4392aff1e * Don't use alloca for audio buffers on OSX and BSD, because the stacksize on both isn't infinite. 
This might explain the audio-core crashes we have seen in the past on Mac OS X 
* Fix issues with platforms which don't have alloca() (defined)
2006-02-17 16:15:50 +00:00

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/*****************************************************************************
* aout_internal.h : internal defines for audio output
*****************************************************************************
* Copyright (C) 2002 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.
*****************************************************************************/
/*****************************************************************************
* aout_alloc_t : allocation of memory in the audio output
*****************************************************************************/
typedef struct aout_alloc_t
{
int i_alloc_type;
int i_bytes_per_sec;
} aout_alloc_t;
#define AOUT_ALLOC_NONE 0
#define AOUT_ALLOC_STACK 1
#define AOUT_ALLOC_HEAP 2
#if defined( __APPLE__ ) || defined( SYS_BSD )
#undef HAVE_ALLOCA
#endif
#ifdef HAVE_ALLOCA
# define ALLOCA_TEST( p_alloc, p_new_buffer ) \
if ( (p_alloc)->i_alloc_type == AOUT_ALLOC_STACK ) \
{ \
(p_new_buffer) = alloca( i_alloc_size + sizeof(aout_buffer_t) );\
i_alloc_type = AOUT_ALLOC_STACK; \
} \
else
#else
# define ALLOCA_TEST( p_alloc, p_new_buffer )
#endif
#define aout_BufferAlloc( p_alloc, i_nb_usec, p_previous_buffer, \
p_new_buffer ) \
if ( (p_alloc)->i_alloc_type == AOUT_ALLOC_NONE ) \
{ \
(p_new_buffer) = p_previous_buffer; \
} \
else \
{ \
int i_alloc_size, i_alloc_type; \
i_alloc_size = (int)( (uint64_t)(p_alloc)->i_bytes_per_sec \
* (i_nb_usec) / 1000000 + 1 ); \
ALLOCA_TEST( p_alloc, p_new_buffer ) \
{ \
(p_new_buffer) = malloc( i_alloc_size + sizeof(aout_buffer_t) );\
i_alloc_type = AOUT_ALLOC_HEAP; \
} \
if ( p_new_buffer != NULL ) \
{ \
(p_new_buffer)->i_alloc_type = i_alloc_type; \
(p_new_buffer)->i_size = i_alloc_size; \
(p_new_buffer)->p_buffer = (byte_t *)(p_new_buffer) \
+ sizeof(aout_buffer_t); \
if ( (p_previous_buffer) != NULL ) \
{ \
(p_new_buffer)->start_date = \
((aout_buffer_t *)p_previous_buffer)->start_date;\
(p_new_buffer)->end_date = \
((aout_buffer_t *)p_previous_buffer)->end_date; \
} \
} \
/* we'll keep that for a while --Meuuh */ \
/* else printf("%s:%d\n", __FILE__, __LINE__); */ \
}
#define aout_BufferFree( p_buffer ) \
if( p_buffer != NULL && (p_buffer)->i_alloc_type == AOUT_ALLOC_HEAP ) \
{ \
free( p_buffer ); \
} \
p_buffer = NULL;
/*****************************************************************************
* aout_fifo_t : audio output buffer FIFO
*****************************************************************************/
struct aout_fifo_t
{
aout_buffer_t * p_first;
aout_buffer_t ** pp_last;
audio_date_t end_date;
};
/*****************************************************************************
* aout_filter_t : audio output filter
*****************************************************************************/
struct aout_filter_t
{
VLC_COMMON_MEMBERS
audio_sample_format_t input;
audio_sample_format_t output;
aout_alloc_t output_alloc;
module_t * p_module;
struct aout_filter_sys_t * p_sys;
void (* pf_do_work)( struct aout_instance_t *,
struct aout_filter_t *,
struct aout_buffer_t *,
struct aout_buffer_t * );
vlc_bool_t b_in_place;
vlc_bool_t b_continuity;
};
/*****************************************************************************
* aout_mixer_t : audio output mixer
*****************************************************************************/
typedef struct aout_mixer_t
{
audio_sample_format_t mixer;
aout_alloc_t output_alloc;
module_t * p_module;
struct aout_mixer_sys_t * p_sys;
void (* pf_do_work)( struct aout_instance_t *,
struct aout_buffer_t * );
/* If b_error == 1, there is no mixer. */
vlc_bool_t b_error;
/* Multiplier used to raise or lower the volume of the sound in
* software. Beware, this creates sound distortion and should be avoided
* as much as possible. This isn't available for non-float32 mixer. */
float f_multiplier;
} aout_mixer_t;
/*****************************************************************************
* aout_input_t : input stream for the audio output
*****************************************************************************/
#define AOUT_RESAMPLING_NONE 0
#define AOUT_RESAMPLING_UP 1
#define AOUT_RESAMPLING_DOWN 2
struct aout_input_t
{
/* When this lock is taken, the pipeline cannot be changed by a
* third-party. */
vlc_mutex_t lock;
/* The input thread that spawned this input */
input_thread_t *p_input_thread;
audio_sample_format_t input;
aout_alloc_t input_alloc;
/* pre-filters */
aout_filter_t * pp_filters[AOUT_MAX_FILTERS];
int i_nb_filters;
/* resamplers */
aout_filter_t * pp_resamplers[AOUT_MAX_FILTERS];
int i_nb_resamplers;
int i_resampling_type;
mtime_t i_resamp_start_date;
int i_resamp_start_drift;
aout_fifo_t fifo;
/* Mixer information */
byte_t * p_first_byte_to_mix;
/* If b_restart == 1, the input pipeline will be re-created. */
vlc_bool_t b_restart;
/* If b_error == 1, there is no input pipeline. */
vlc_bool_t b_error;
/* Did we just change the output format? (expect buffer inconsistencies) */
vlc_bool_t b_changed;
/* internal caching delay from input */
int i_pts_delay;
/* desynchronisation delay request by the user */
int i_desync;
};
/*****************************************************************************
* aout_output_t : output stream for the audio output
*****************************************************************************/
typedef struct aout_output_t
{
audio_sample_format_t output;
/* Indicates whether the audio output is currently starving, to avoid
* printing a 1,000 "output is starving" messages. */
vlc_bool_t b_starving;
/* post-filters */
aout_filter_t * pp_filters[AOUT_MAX_FILTERS];
int i_nb_filters;
aout_fifo_t fifo;
struct module_t * p_module;
struct aout_sys_t * p_sys;
void (* pf_play)( aout_instance_t * );
int (* pf_volume_get )( aout_instance_t *, audio_volume_t * );
int (* pf_volume_set )( aout_instance_t *, audio_volume_t );
int (* pf_volume_infos )( aout_instance_t *, audio_volume_t * );
int i_nb_samples;
/* Current volume for the output - it's just a placeholder, the plug-in
* may or may not use it. */
audio_volume_t i_volume;
/* If b_error == 1, there is no audio output pipeline. */
vlc_bool_t b_error;
} aout_output_t;
/*****************************************************************************
* aout_instance_t : audio output thread descriptor
*****************************************************************************/
struct aout_instance_t
{
VLC_COMMON_MEMBERS
/* Locks : please note that if you need several of these locks, it is
* mandatory (to avoid deadlocks) to take them in the following order :
* mixer_lock, p_input->lock, output_fifo_lock, input_fifos_lock.
* --Meuuh */
/* When input_fifos_lock is taken, none of the p_input->fifo structures
* can be read or modified by a third-party thread. */
vlc_mutex_t input_fifos_lock;
/* When mixer_lock is taken, all decoder threads willing to mix a
* buffer must wait until it is released. The output pipeline cannot
* be modified. No input stream can be added or removed. */
vlc_mutex_t mixer_lock;
/* When output_fifo_lock is taken, the p_aout->output.fifo structure
* cannot be read or written by a third-party thread. */
vlc_mutex_t output_fifo_lock;
/* Input streams & pre-filters */
aout_input_t * pp_inputs[AOUT_MAX_INPUTS];
int i_nb_inputs;
/* Mixer */
aout_mixer_t mixer;
/* Output plug-in */
aout_output_t output;
};
/*****************************************************************************
* Prototypes
*****************************************************************************/
/* From input.c : */
int aout_InputNew( aout_instance_t * p_aout, aout_input_t * p_input );
int aout_InputDelete( aout_instance_t * p_aout, aout_input_t * p_input );
int aout_InputPlay( aout_instance_t * p_aout, aout_input_t * p_input,
aout_buffer_t * p_buffer );
/* From filters.c : */
VLC_EXPORT( int, aout_FiltersCreatePipeline, ( aout_instance_t * p_aout, aout_filter_t ** pp_filters, int * pi_nb_filters, const audio_sample_format_t * p_input_format, const audio_sample_format_t * p_output_format ) );
VLC_EXPORT( void, aout_FiltersDestroyPipeline, ( aout_instance_t * p_aout, aout_filter_t ** pp_filters, int i_nb_filters ) );
VLC_EXPORT( void, aout_FiltersPlay, ( aout_instance_t * p_aout, aout_filter_t ** pp_filters, int i_nb_filters, aout_buffer_t ** pp_input_buffer ) );
void aout_FiltersHintBuffers( aout_instance_t * p_aout, aout_filter_t ** pp_filters, int i_nb_filters, aout_alloc_t * p_first_alloc );
/* From mixer.c : */
int aout_MixerNew( aout_instance_t * p_aout );
void aout_MixerDelete( aout_instance_t * p_aout );
void aout_MixerRun( aout_instance_t * p_aout );
int aout_MixerMultiplierSet( aout_instance_t * p_aout, float f_multiplier );
int aout_MixerMultiplierGet( aout_instance_t * p_aout, float * pf_multiplier );
/* From output.c : */
int aout_OutputNew( aout_instance_t * p_aout,
audio_sample_format_t * p_format );
void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer );
void aout_OutputDelete( aout_instance_t * p_aout );
VLC_EXPORT( aout_buffer_t *, aout_OutputNextBuffer, ( aout_instance_t *, mtime_t, vlc_bool_t ) );
/* From common.c : */
VLC_EXPORT( unsigned int, aout_FormatNbChannels, ( const audio_sample_format_t * p_format ) );
VLC_EXPORT( void, aout_FormatPrepare, ( audio_sample_format_t * p_format ) );
VLC_EXPORT( void, aout_FormatPrint, ( aout_instance_t * p_aout, const char * psz_text, const audio_sample_format_t * p_format ) );
VLC_EXPORT( 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 ) );
VLC_EXPORT( const char *, aout_FormatPrintChannels, ( const audio_sample_format_t * ) );
void aout_FifoInit( aout_instance_t *, aout_fifo_t *, uint32_t );
mtime_t aout_FifoNextStart( aout_instance_t *, aout_fifo_t * );
void aout_FifoPush( aout_instance_t *, aout_fifo_t *, aout_buffer_t * );
void aout_FifoSet( aout_instance_t *, aout_fifo_t *, mtime_t );
void aout_FifoMoveDates( aout_instance_t *, aout_fifo_t *, mtime_t );
VLC_EXPORT( aout_buffer_t *, aout_FifoPop, ( aout_instance_t * p_aout, aout_fifo_t * p_fifo ) );
void aout_FifoDestroy( aout_instance_t * p_aout, aout_fifo_t * p_fifo );
VLC_EXPORT( mtime_t, aout_FifoFirstDate, ( aout_instance_t *, aout_fifo_t * ) );
/* From intf.c :*/
VLC_EXPORT( void, aout_VolumeSoftInit, ( aout_instance_t * ) );
int aout_VolumeSoftGet( aout_instance_t *, audio_volume_t * );
int aout_VolumeSoftSet( aout_instance_t *, audio_volume_t );
int aout_VolumeSoftInfos( aout_instance_t *, audio_volume_t * );
VLC_EXPORT( void, aout_VolumeNoneInit, ( aout_instance_t * ) );
int aout_VolumeNoneGet( aout_instance_t *, audio_volume_t * );
int aout_VolumeNoneSet( aout_instance_t *, audio_volume_t );
int aout_VolumeNoneInfos( aout_instance_t *, audio_volume_t * );
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