/***************************************************************************** * audio_output.h : audio output interface ***************************************************************************** * Copyright (C) 2002-2005 the VideoLAN team * $Id: f3d55ecfab442d895d0558f2b6a7f66f657d4930 $ * * Authors: Christophe Massiot * * 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. *****************************************************************************/ #ifndef VLC_AOUT_H #define VLC_AOUT_H 1 /** * \file * This file defines functions, structures and macros for audio output object */ # ifdef __cplusplus extern "C" { # endif #include "vlc_es.h" #define AOUT_FMTS_IDENTICAL( p_first, p_second ) ( \ ((p_first)->i_format == (p_second)->i_format) \ && AOUT_FMTS_SIMILAR(p_first, p_second) ) /* 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) ) #define VLC_CODEC_SPDIFL VLC_FOURCC('s','p','d','i') #define VLC_CODEC_SPDIFB VLC_FOURCC('s','p','d','b') #define AOUT_FMT_NON_LINEAR( p_format ) \ ( ((p_format)->i_format == VLC_CODEC_SPDIFL) \ || ((p_format)->i_format == VLC_CODEC_SPDIFB) \ || ((p_format)->i_format == VLC_CODEC_A52) \ || ((p_format)->i_format == VLC_CODEC_DTS) ) /* This is heavily borrowed from libmad, by Robert Leslie */ /* * 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 #define AOUT_CHAN_MAX 9 /* 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 4 #define AOUT_VAR_3F2R 5 #define AOUT_VAR_5_1 6 #define AOUT_VAR_6_1 7 #define AOUT_VAR_7_1 8 #define AOUT_VAR_SPDIF 10 #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 /***************************************************************************** * Main audio output structures *****************************************************************************/ #define aout_BufferFree( buffer ) block_Release( buffer ) /* 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 /* Max input rate factor (1/4 -> 4) */ #define AOUT_MAX_INPUT_RATE (4) /** allocation of memory in the audio output */ typedef struct aout_alloc_t { bool b_alloc; int i_bytes_per_sec; } aout_alloc_t; /** audio output buffer FIFO */ struct aout_fifo_t { aout_buffer_t * p_first; aout_buffer_t ** pp_last; date_t end_date; }; /* FIXME to remove once aout.h is cleaned a bit more */ #include #include /** audio output filter */ typedef struct aout_filter_owner_sys_t aout_filter_owner_sys_t; typedef struct aout_filter_sys_t aout_filter_sys_t; struct aout_filter_t { VLC_COMMON_MEMBERS module_t * p_module; aout_filter_sys_t *p_sys; es_format_t fmt_in; es_format_t fmt_out; aout_alloc_t output_alloc; bool b_in_place; void (*pf_do_work)( aout_instance_t *, aout_filter_t *, aout_buffer_t *, aout_buffer_t * ); /* Private structure for the owner of the filter */ aout_filter_owner_sys_t *p_owner; }; #define AOUT_RESAMPLING_NONE 0 #define AOUT_RESAMPLING_UP 1 #define AOUT_RESAMPLING_DOWN 2 /** an 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. */ bool b_starving; /* post-filters */ 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 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. */ bool b_error; } aout_output_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; /* volume_vars_lock is taken */ vlc_mutex_t volume_vars_lock; /* Input streams & pre-filters */ aout_input_t * pp_inputs[AOUT_MAX_INPUTS]; int i_nb_inputs; /* Mixer */ audio_sample_format_t mixer_format; aout_alloc_t mixer_allocation; float mixer_multiplier; aout_mixer_t *p_mixer; /* Output plug-in */ aout_output_t output; }; /** * It describes the audio channel order VLC expect. */ static const uint32_t pi_vlc_chan_order_wg4[] = { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, AOUT_CHAN_REARCENTER, AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 }; /***************************************************************************** * Prototypes *****************************************************************************/ VLC_EXPORT( aout_buffer_t *, aout_OutputNextBuffer, ( aout_instance_t *, mtime_t, bool ) LIBVLC_USED ); /** * This function computes the reordering needed to go from pi_chan_order_in to * pi_chan_order_out. * If pi_chan_order_in or pi_chan_order_out is NULL, it will assume that vlc * internal (WG4) order is requested. */ VLC_EXPORT( int, aout_CheckChannelReorder, ( const uint32_t *pi_chan_order_in, const uint32_t *pi_chan_order_out, uint32_t i_channel_mask, int i_channels, int *pi_chan_table ) ); VLC_EXPORT( void, aout_ChannelReorder, ( uint8_t *, int, int, const int *, int ) ); /** * This fonction will compute the extraction parameter into pi_selection to go * from i_channels with their type given by pi_order_src[] into the order * describe by pi_order_dst. * It will also set : * - *pi_channels as the number of channels that will be extracted which is * lower (in case of non understood channels type) or equal to i_channels. * - the layout of the channels (*pi_layout). * * It will return true if channel extraction is really needed, in which case * aout_ChannelExtract must be used * * XXX It must be used when the source may have channel type not understood * by VLC. In this case the channel type pi_order_src[] must be set to 0. * XXX It must also be used if multiple channels have the same type. */ VLC_EXPORT( bool, aout_CheckChannelExtraction, ( int *pi_selection, uint32_t *pi_layout, int *pi_channels, const uint32_t pi_order_dst[AOUT_CHAN_MAX], const uint32_t *pi_order_src, int i_channels ) ); /** * Do the actual channels extraction using the parameters created by * aout_CheckChannelExtraction. * * XXX this function does not work in place (p_dst and p_src must not overlap). * XXX Only 8, 16, 24, 32, 64 bits per sample are supported. */ VLC_EXPORT( void, aout_ChannelExtract, ( void *p_dst, int i_dst_channels, const void *p_src, int i_src_channels, int i_sample_count, const int *pi_selection, int i_bits_per_sample ) ); /* */ VLC_EXPORT( unsigned int, aout_FormatNbChannels, ( const audio_sample_format_t * p_format ) LIBVLC_USED ); VLC_EXPORT( unsigned int, aout_BitsPerSample, ( vlc_fourcc_t i_format ) LIBVLC_USED ); 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( const char *, aout_FormatPrintChannels, ( const audio_sample_format_t * ) LIBVLC_USED ); VLC_EXPORT( mtime_t, aout_FifoFirstDate, ( aout_instance_t *, aout_fifo_t * ) LIBVLC_USED ); VLC_EXPORT( aout_buffer_t *, aout_FifoPop, ( aout_instance_t * p_aout, aout_fifo_t * p_fifo ) LIBVLC_USED ); /* From intf.c : */ VLC_EXPORT( void, aout_VolumeSoftInit, ( aout_instance_t * ) ); VLC_EXPORT( void, aout_VolumeNoneInit, ( aout_instance_t * ) ); VLC_EXPORT( int, aout_VolumeGet, ( vlc_object_t *, audio_volume_t * ) ); #define aout_VolumeGet(a, b) aout_VolumeGet(VLC_OBJECT(a), b) VLC_EXPORT( int, aout_VolumeSet, ( vlc_object_t *, audio_volume_t ) ); #define aout_VolumeSet(a, b) aout_VolumeSet(VLC_OBJECT(a), b) VLC_EXPORT( int, aout_VolumeUp, ( vlc_object_t *, int, audio_volume_t * ) ); #define aout_VolumeUp(a, b, c) aout_VolumeUp(VLC_OBJECT(a), b, c) VLC_EXPORT( int, aout_VolumeDown, ( vlc_object_t *, int, audio_volume_t * ) ); #define aout_VolumeDown(a, b, c) aout_VolumeDown(VLC_OBJECT(a), b, c) VLC_EXPORT( int, aout_ToggleMute, ( vlc_object_t *, audio_volume_t * ) ); #define aout_ToggleMute(a, b) aout_ToggleMute(VLC_OBJECT(a), b) VLC_EXPORT( int, aout_SetMute, ( vlc_object_t *, audio_volume_t *, bool ) ); VLC_EXPORT( bool, aout_IsMuted, ( vlc_object_t * ) ); VLC_EXPORT( int, aout_FindAndRestart, ( vlc_object_t *, const char *, vlc_value_t, vlc_value_t, void * ) ); VLC_EXPORT( int, aout_ChannelsRestart, ( vlc_object_t *, const char *, vlc_value_t, vlc_value_t, void * ) ); VLC_EXPORT( void, aout_EnableFilter, (vlc_object_t *, const char *, bool )); #define aout_EnableFilter( o, n, b ) \ aout_EnableFilter( VLC_OBJECT(o), n, b ) /* */ VLC_EXPORT( vout_thread_t *, aout_filter_RequestVout, ( filter_t *, vout_thread_t *p_vout, video_format_t *p_fmt ) ); # ifdef __cplusplus } # endif #endif /* _VLC_AOUT_H */