mirror of
https://code.videolan.org/videolan/vlc
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188 lines
8.1 KiB
C
188 lines
8.1 KiB
C
/*****************************************************************************
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* audio_output.h : audio output interface
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*****************************************************************************
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* Copyright (C) 2002 VideoLAN
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* $Id: audio_output.h,v 1.77 2003/02/06 15:14:41 massiot Exp $
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* audio_sample_format_t
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*****************************************************************************
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* This structure defines a format for audio samples.
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*****************************************************************************/
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struct audio_sample_format_t
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{
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vlc_fourcc_t i_format;
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unsigned int i_rate;
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/* Describes the channels configuration of the samples (ie. number of
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* channels which are available in the buffer, and positions). */
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uint32_t i_physical_channels;
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/* Describes from which original channels, before downmixing, the
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* buffer is derived. */
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uint32_t i_original_channels;
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/* Optional - for A/52, SPDIF and DTS types : */
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/* Bytes used by one compressed frame, depends on bitrate. */
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unsigned int i_bytes_per_frame;
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/* Number of sampleframes contained in one compressed frame. */
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unsigned int i_frame_length;
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/* Please note that it may be completely arbitrary - buffers are not
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* obliged to contain a integral number of so-called "frames". It's
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* just here for the division :
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* buffer_size = i_nb_samples * i_bytes_per_frame / i_frame_length
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*/
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};
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#define AOUT_FMTS_IDENTICAL( p_first, p_second ) ( \
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((p_first)->i_format == (p_second)->i_format) \
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&& ((p_first)->i_rate == (p_second)->i_rate) \
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&& ((p_first)->i_physical_channels == (p_second)->i_physical_channels)\
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&& ((p_first)->i_original_channels == (p_second)->i_original_channels) )
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/* Check if i_rate == i_rate and i_channels == i_channels */
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#define AOUT_FMTS_SIMILAR( p_first, p_second ) ( \
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((p_first)->i_rate == (p_second)->i_rate) \
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&& ((p_first)->i_physical_channels == (p_second)->i_physical_channels)\
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&& ((p_first)->i_original_channels == (p_second)->i_original_channels) )
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#ifdef WORDS_BIGENDIAN
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# define AOUT_FMT_S16_NE VLC_FOURCC('s','1','6','b')
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# define AOUT_FMT_U16_NE VLC_FOURCC('u','1','6','b')
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#else
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# define AOUT_FMT_S16_NE VLC_FOURCC('s','1','6','l')
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# define AOUT_FMT_U16_NE VLC_FOURCC('u','1','6','l')
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#endif
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#define AOUT_FMT_NON_LINEAR( p_format ) \
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( ((p_format)->i_format == VLC_FOURCC('s','p','d','i')) \
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|| ((p_format)->i_format == VLC_FOURCC('a','5','2',' ')) \
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|| ((p_format)->i_format == VLC_FOURCC('d','t','s',' ')) )
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/* This is heavily borrowed from libmad, by Robert Leslie <rob@mars.org> */
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/*
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* Fixed-point format: 0xABBBBBBB
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* A == whole part (sign + 3 bits)
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* B == fractional part (28 bits)
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*
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* Values are signed two's complement, so the effective range is:
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* 0x80000000 to 0x7fffffff
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* -8.0 to +7.9999999962747097015380859375
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*
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* The smallest representable value is:
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* 0x00000001 == 0.0000000037252902984619140625 (i.e. about 3.725e-9)
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*
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* 28 bits of fractional accuracy represent about
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* 8.6 digits of decimal accuracy.
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*
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* Fixed-point numbers can be added or subtracted as normal
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* integers, but multiplication requires shifting the 64-bit result
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* from 56 fractional bits back to 28 (and rounding.)
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*/
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typedef int32_t vlc_fixed_t;
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#define FIXED32_FRACBITS 28
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#define FIXED32_MIN ((vlc_fixed_t) -0x80000000L)
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#define FIXED32_MAX ((vlc_fixed_t) +0x7fffffffL)
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#define FIXED32_ONE ((vlc_fixed_t) 0x10000000)
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/*
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* Channels descriptions
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*/
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/* Values available for physical and original channels */
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#define AOUT_CHAN_CENTER 0x1
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#define AOUT_CHAN_LEFT 0x2
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#define AOUT_CHAN_RIGHT 0x4
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#define AOUT_CHAN_REARCENTER 0x10
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#define AOUT_CHAN_REARLEFT 0x20
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#define AOUT_CHAN_REARRIGHT 0x40
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#define AOUT_CHAN_LFE 0x100
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/* Values available for original channels only */
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#define AOUT_CHAN_DOLBYSTEREO 0x10000
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#define AOUT_CHAN_DUALMONO 0x20000
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#define AOUT_CHAN_REVERSESTEREO 0x40000
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#define AOUT_CHAN_PHYSMASK 0xFFFF
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/*****************************************************************************
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* aout_buffer_t : audio output buffer
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*****************************************************************************/
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struct aout_buffer_t
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{
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byte_t * p_buffer;
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int i_alloc_type;
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/* i_size is the real size of the buffer (used for debug ONLY), i_nb_bytes
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* is the number of significative bytes in it. */
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size_t i_size, i_nb_bytes;
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unsigned int i_nb_samples;
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mtime_t start_date, end_date;
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struct aout_buffer_t * p_next;
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};
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/* Size of a frame for S/PDIF output. */
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#define AOUT_SPDIF_SIZE 6144
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/* Number of samples in an A/52 frame. */
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#define A52_FRAME_NB 1536
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/*****************************************************************************
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* audio_date_t : date incrementation without long-term rounding errors
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*****************************************************************************/
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struct audio_date_t
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{
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mtime_t date;
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uint32_t i_divider;
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uint32_t i_remainder;
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};
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/*****************************************************************************
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* Prototypes
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*****************************************************************************/
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/* From common.c : */
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#define aout_New(a) __aout_New(VLC_OBJECT(a))
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VLC_EXPORT( aout_instance_t *, __aout_New, ( vlc_object_t * ) );
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VLC_EXPORT( void, aout_Delete, ( aout_instance_t * ) );
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VLC_EXPORT( void, aout_DateInit, ( audio_date_t *, uint32_t ) );
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VLC_EXPORT( void, aout_DateSet, ( audio_date_t *, mtime_t ) );
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VLC_EXPORT( void, aout_DateMove, ( audio_date_t *, mtime_t ) );
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VLC_EXPORT( mtime_t, aout_DateGet, ( const audio_date_t * ) );
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VLC_EXPORT( mtime_t, aout_DateIncrement, ( audio_date_t *, uint32_t ) );
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/* From dec.c : */
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#define aout_DecNew(a, b, c) __aout_DecNew(VLC_OBJECT(a), b, c)
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VLC_EXPORT( aout_input_t *, __aout_DecNew, ( vlc_object_t *, aout_instance_t **, audio_sample_format_t * ) );
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VLC_EXPORT( int, aout_DecDelete, ( aout_instance_t *, aout_input_t * ) );
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VLC_EXPORT( aout_buffer_t *, aout_DecNewBuffer, ( aout_instance_t *, aout_input_t *, size_t ) );
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VLC_EXPORT( void, aout_DecDeleteBuffer, ( aout_instance_t *, aout_input_t *, aout_buffer_t * ) );
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VLC_EXPORT( int, aout_DecPlay, ( aout_instance_t *, aout_input_t *, aout_buffer_t * ) );
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/* From intf.c : */
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VLC_EXPORT( int, aout_VolumeGet, ( aout_instance_t *, audio_volume_t * ) );
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VLC_EXPORT( int, aout_VolumeSet, ( aout_instance_t *, audio_volume_t ) );
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VLC_EXPORT( int, aout_VolumeInfos, ( aout_instance_t *, audio_volume_t * ) );
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VLC_EXPORT( int, aout_VolumeUp, ( aout_instance_t *, int, audio_volume_t * ) );
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VLC_EXPORT( int, aout_VolumeDown, ( aout_instance_t *, int, audio_volume_t * ) );
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VLC_EXPORT( int, aout_VolumeMute, ( aout_instance_t *, audio_volume_t * ) );
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VLC_EXPORT( int, aout_Restart, ( aout_instance_t * p_aout ) );
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VLC_EXPORT( void, aout_FindAndRestart, ( vlc_object_t * p_this ) );
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VLC_EXPORT( int, aout_ChannelsRestart, ( vlc_object_t *, const char *, vlc_value_t, vlc_value_t, void * ) );
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