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vlc/include/audio_output.h
Gildas Bazin 30336bba3f * src/misc/variables.c, ALL: improvements to the object variables api. 
- added another argument to var_Change().
   - added a VLC_VAR_SETTEXT and VLC_VAR_GETTEXT method to var_Change()
     that are used to set/get a friendly name to an object variable.
   - added VLC_VAR_CHOICESCOUNT to var_Change() to be able to retrieve
     the number of availabel choices without having to get their value
     as well.
   - VLC_VAR_ADDCHOICE uses the extra var_Change() argument to assign
     a friendly name to the choice value.
   - VLC_VAR_GETCHOICES retrieves the choices values and their friendly
     names.

* modules/gui/wxwindows/*: first step in implementing menu auto-generation in the wxWindows interface.
2003-05-04 22:42:18 +00:00

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/*****************************************************************************
* audio_output.h : audio output interface
*****************************************************************************
* Copyright (C) 2002 VideoLAN
* $Id: audio_output.h,v 1.80 2003/05/04 22:42:14 gbazin 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.
*****************************************************************************/
/*****************************************************************************
* audio_sample_format_t
*****************************************************************************
* This structure defines a format for audio samples.
*****************************************************************************/
struct audio_sample_format_t
{
vlc_fourcc_t i_format;
unsigned int i_rate;
/* Describes the channels configuration of the samples (ie. number of
* channels which are available in the buffer, and positions). */
uint32_t i_physical_channels;
/* Describes from which original channels, before downmixing, the
* buffer is derived. */
uint32_t i_original_channels;
/* Optional - for A/52, SPDIF and DTS types : */
/* Bytes used by one compressed frame, depends on bitrate. */
unsigned int i_bytes_per_frame;
/* Number of sampleframes contained in one compressed frame. */
unsigned int i_frame_length;
/* Please note that it may be completely arbitrary - buffers are not
* obliged to contain a integral number of so-called "frames". It's
* just here for the division :
* buffer_size = i_nb_samples * i_bytes_per_frame / i_frame_length
*/
};
#define AOUT_FMTS_IDENTICAL( p_first, p_second ) ( \
((p_first)->i_format == (p_second)->i_format) \
&& ((p_first)->i_rate == (p_second)->i_rate) \
&& ((p_first)->i_physical_channels == (p_second)->i_physical_channels)\
&& ((p_first)->i_original_channels == (p_second)->i_original_channels) )
/* Check if i_rate == i_rate and i_channels == i_channels */
#define AOUT_FMTS_SIMILAR( p_first, p_second ) ( \
((p_first)->i_rate == (p_second)->i_rate) \
&& ((p_first)->i_physical_channels == (p_second)->i_physical_channels)\
&& ((p_first)->i_original_channels == (p_second)->i_original_channels) )
#ifdef WORDS_BIGENDIAN
# define AOUT_FMT_S16_NE VLC_FOURCC('s','1','6','b')
# define AOUT_FMT_U16_NE VLC_FOURCC('u','1','6','b')
#else
# define AOUT_FMT_S16_NE VLC_FOURCC('s','1','6','l')
# define AOUT_FMT_U16_NE VLC_FOURCC('u','1','6','l')
#endif
#define AOUT_FMT_NON_LINEAR( p_format ) \
( ((p_format)->i_format == VLC_FOURCC('s','p','d','i')) \
|| ((p_format)->i_format == VLC_FOURCC('a','5','2',' ')) \
|| ((p_format)->i_format == VLC_FOURCC('d','t','s',' ')) )
/* This is heavily borrowed from libmad, by Robert Leslie <rob@mars.org> */
/*
* Fixed-point format: 0xABBBBBBB
* A == whole part (sign + 3 bits)
* B == fractional part (28 bits)
*
* Values are signed two's complement, so the effective range is:
* 0x80000000 to 0x7fffffff
* -8.0 to +7.9999999962747097015380859375
*
* The smallest representable value is:
* 0x00000001 == 0.0000000037252902984619140625 (i.e. about 3.725e-9)
*
* 28 bits of fractional accuracy represent about
* 8.6 digits of decimal accuracy.
*
* Fixed-point numbers can be added or subtracted as normal
* integers, but multiplication requires shifting the 64-bit result
* from 56 fractional bits back to 28 (and rounding.)
*/
typedef int32_t vlc_fixed_t;
#define FIXED32_FRACBITS 28
#define FIXED32_MIN ((vlc_fixed_t) -0x80000000L)
#define FIXED32_MAX ((vlc_fixed_t) +0x7fffffffL)
#define FIXED32_ONE ((vlc_fixed_t) 0x10000000)
/*
* Channels descriptions
*/
/* Values available for physical and original channels */
#define AOUT_CHAN_CENTER 0x1
#define AOUT_CHAN_LEFT 0x2
#define AOUT_CHAN_RIGHT 0x4
#define AOUT_CHAN_REARCENTER 0x10
#define AOUT_CHAN_REARLEFT 0x20
#define AOUT_CHAN_REARRIGHT 0x40
#define AOUT_CHAN_MIDDLELEFT 0x100
#define AOUT_CHAN_MIDDLERIGHT 0x200
#define AOUT_CHAN_LFE 0x1000
/* Values available for original channels only */
#define AOUT_CHAN_DOLBYSTEREO 0x10000
#define AOUT_CHAN_DUALMONO 0x20000
#define AOUT_CHAN_REVERSESTEREO 0x40000
#define AOUT_CHAN_PHYSMASK 0xFFFF
/* Values used for the audio-device and audio-channels object variables */
#define AOUT_VAR_MONO 1
#define AOUT_VAR_STEREO 2
#define AOUT_VAR_2F2R 3
#define AOUT_VAR_5_1 4
#define AOUT_VAR_6_1 5
#define AOUT_VAR_7_1 6
#define AOUT_VAR_SPDIF 7
#define AOUT_VAR_CHAN_STEREO 1
#define AOUT_VAR_CHAN_RSTEREO 2
#define AOUT_VAR_CHAN_LEFT 3
#define AOUT_VAR_CHAN_RIGHT 4
#define AOUT_VAR_CHAN_DOLBYS 5
/*****************************************************************************
* aout_buffer_t : audio output buffer
*****************************************************************************/
struct aout_buffer_t
{
byte_t * p_buffer;
int i_alloc_type;
/* i_size is the real size of the buffer (used for debug ONLY), i_nb_bytes
* is the number of significative bytes in it. */
size_t i_size, i_nb_bytes;
unsigned int i_nb_samples;
mtime_t start_date, end_date;
struct aout_buffer_t * p_next;
};
/* Size of a frame for S/PDIF output. */
#define AOUT_SPDIF_SIZE 6144
/* Number of samples in an A/52 frame. */
#define A52_FRAME_NB 1536
/*****************************************************************************
* audio_date_t : date incrementation without long-term rounding errors
*****************************************************************************/
struct audio_date_t
{
mtime_t date;
uint32_t i_divider;
uint32_t i_remainder;
};
/*****************************************************************************
* Prototypes
*****************************************************************************/
/* From common.c : */
#define aout_New(a) __aout_New(VLC_OBJECT(a))
VLC_EXPORT( aout_instance_t *, __aout_New, ( vlc_object_t * ) );
VLC_EXPORT( void, aout_Delete, ( aout_instance_t * ) );
VLC_EXPORT( void, aout_DateInit, ( audio_date_t *, uint32_t ) );
VLC_EXPORT( void, aout_DateSet, ( audio_date_t *, mtime_t ) );
VLC_EXPORT( void, aout_DateMove, ( audio_date_t *, mtime_t ) );
VLC_EXPORT( mtime_t, aout_DateGet, ( const audio_date_t * ) );
VLC_EXPORT( mtime_t, aout_DateIncrement, ( audio_date_t *, uint32_t ) );
/* From dec.c : */
#define aout_DecNew(a, b, c) __aout_DecNew(VLC_OBJECT(a), b, c)
VLC_EXPORT( aout_input_t *, __aout_DecNew, ( vlc_object_t *, aout_instance_t **, audio_sample_format_t * ) );
VLC_EXPORT( int, aout_DecDelete, ( aout_instance_t *, aout_input_t * ) );
VLC_EXPORT( aout_buffer_t *, aout_DecNewBuffer, ( aout_instance_t *, aout_input_t *, size_t ) );
VLC_EXPORT( void, aout_DecDeleteBuffer, ( aout_instance_t *, aout_input_t *, aout_buffer_t * ) );
VLC_EXPORT( int, aout_DecPlay, ( aout_instance_t *, aout_input_t *, aout_buffer_t * ) );
/* From intf.c : */
#define aout_VolumeGet(a, b) __aout_VolumeGet(VLC_OBJECT(a), b)
VLC_EXPORT( int, __aout_VolumeGet, ( vlc_object_t *, audio_volume_t * ) );
#define aout_VolumeSet(a, b) __aout_VolumeSet(VLC_OBJECT(a), b)
VLC_EXPORT( int, __aout_VolumeSet, ( vlc_object_t *, audio_volume_t ) );
#define aout_VolumeInfos(a, b) __aout_VolumeInfos(VLC_OBJECT(a), b)
VLC_EXPORT( int, __aout_VolumeInfos, ( vlc_object_t *, audio_volume_t * ) );
#define aout_VolumeUp(a, b, c) __aout_VolumeUp(VLC_OBJECT(a), b, c)
VLC_EXPORT( int, __aout_VolumeUp, ( vlc_object_t *, int, audio_volume_t * ) );
#define aout_VolumeDown(a, b, c) __aout_VolumeDown(VLC_OBJECT(a), b, c)
VLC_EXPORT( int, __aout_VolumeDown, ( vlc_object_t *, int, audio_volume_t * ) );
#define aout_VolumeMute(a, b) __aout_VolumeMute(VLC_OBJECT(a), b)
VLC_EXPORT( int, __aout_VolumeMute, ( vlc_object_t *, audio_volume_t * ) );
VLC_EXPORT( int, aout_Restart, ( aout_instance_t * p_aout ) );
VLC_EXPORT( void, aout_FindAndRestart, ( vlc_object_t * p_this ) );
VLC_EXPORT( int, aout_ChannelsRestart, ( vlc_object_t *, const char *, vlc_value_t, vlc_value_t, void * ) );
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