/***************************************************************************** * vlc_aout.h : audio output interface ***************************************************************************** * Copyright (C) 2002-2011 VLC authors and VideoLAN * * Authors: Christophe Massiot * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser 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 */ /* Buffers which arrive in advance of more than AOUT_MAX_ADVANCE_TIME * will be considered as bogus and be trashed */ #define AOUT_MAX_ADVANCE_TIME (AOUT_MAX_PREPARE_TIME + CLOCK_FREQ) /* Buffers which arrive in advance of more than AOUT_MAX_PREPARE_TIME * will cause the calling thread to sleep */ #define AOUT_MAX_PREPARE_TIME (2 * CLOCK_FREQ) /* Buffers which arrive after pts - AOUT_MIN_PREPARE_TIME will be trashed * to avoid too heavy resampling */ #define AOUT_MIN_PREPARE_TIME AOUT_MAX_PTS_ADVANCE /* Tolerance values from EBU Recommendation 37 */ /** Maximum advance of actual audio playback time to coded PTS, * above which downsampling will be performed */ #define AOUT_MAX_PTS_ADVANCE (CLOCK_FREQ / 25) /** Maximum delay of actual audio playback time from coded PTS, * above which upsampling will be performed */ #define AOUT_MAX_PTS_DELAY (3 * CLOCK_FREQ / 50) /* Max acceptable resampling (in %) */ #define AOUT_MAX_RESAMPLING 10 #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 AOUT_FMT_LINEAR( p_format ) \ (aout_BitsPerSample((p_format)->i_format) != 0) #define VLC_CODEC_SPDIFL VLC_FOURCC('s','p','d','i') #define VLC_CODEC_SPDIFB VLC_FOURCC('s','p','d','b') #define AOUT_FMT_SPDIF( 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) ) /* Values used for the audio-channels object variable */ #define AOUT_VAR_CHAN_UNSET 0 /* must be zero */ #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 *****************************************************************************/ /* 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 /* FIXME to remove once aout.h is cleaned a bit more */ #include /** Audio output object */ struct audio_output { VLC_COMMON_MEMBERS struct aout_sys_t *sys; /**< Private data for callbacks */ int (*start)(audio_output_t *, audio_sample_format_t *fmt); /**< Starts a new stream (mandatory, cannot be NULL). * \param fmt input stream sample format upon entry, * output stream sample format upon return [IN/OUT] * \return VLC_SUCCESS on success, non-zero on failure * \note No other stream may be already started when called. */ void (*stop)(audio_output_t *); /**< Stops the existing stream (optional, may be NULL). * \note A stream must have been started when called. */ int (*time_get)(audio_output_t *, mtime_t *delay); /**< Estimates playback buffer latency (optional, may be NULL). * \param delay pointer to the delay until the next sample to be written * to the playback buffer is rendered [OUT] * \return 0 on success, non-zero on failure or lack of data * \note A stream must have been started when called. */ void (*play)(audio_output_t *, block_t *); /**< Queues a block of samples for playback (mandatory, cannot be NULL). * \note A stream must have been started when called. */ void (*pause)( audio_output_t *, bool pause, mtime_t date); /**< Pauses or resumes playback (optional, may be NULL). * \param pause pause if true, resume from pause if false * \param date timestamp when the pause or resume was requested * \note A stream must have been started when called. */ void (*flush)( audio_output_t *, bool wait); /**< Flushes or drains the playback buffers (mandatory, cannot be NULL). * \param wait true to wait for playback of pending buffers (drain), * false to discard pending buffers (flush) * \note A stream must have been started when called. */ int (*volume_set)(audio_output_t *, float volume); /**< Changes playback volume (optional, may be NULL). * \param volume requested volume (0. = mute, 1. = nominal) * \note The volume is always a positive number. * \warning A stream may or may not have been started when called. */ int (*mute_set)(audio_output_t *, bool mute); /**< Changes muting (optinal, may be NULL). * \param mute true to mute, false to unmute * \warning A stream may or may not have been started when called. */ int (*device_select)(audio_output_t *, const char *id); /**< Selects an audio output device (optional, may be NULL). * \param id nul-terminated device unique identifier. * \return 0 on success, non-zero on failure. * \warning A stream may or may not have been started when called. */ struct { void (*volume_report)(audio_output_t *, float); void (*mute_report)(audio_output_t *, bool); void (*policy_report)(audio_output_t *, bool); void (*device_report)(audio_output_t *, const char *); void (*hotplug_report)(audio_output_t *, const char *, const char *); int (*gain_request)(audio_output_t *, float); void (*restart_request)(audio_output_t *, unsigned); } event; }; /** * 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 }; #define AOUT_RESTART_FILTERS 1 #define AOUT_RESTART_OUTPUT 2 #define AOUT_RESTART_DECODER 4 /***************************************************************************** * Prototypes *****************************************************************************/ /** * 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_API unsigned aout_CheckChannelReorder( const uint32_t *, const uint32_t *, uint32_t mask, uint8_t *table ); VLC_API void aout_ChannelReorder(void *, size_t, unsigned, const uint8_t *, vlc_fourcc_t); VLC_API void aout_Interleave(void *dst, const void *const *planes, unsigned samples, unsigned channels, vlc_fourcc_t fourcc); VLC_API void aout_Deinterleave(void *dst, const void *src, unsigned samples, unsigned channels, vlc_fourcc_t fourcc); /** * This function 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_API 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_API 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 ); /* */ static inline unsigned aout_FormatNbChannels(const audio_sample_format_t *fmt) { return popcount(fmt->i_physical_channels); } VLC_API unsigned int aout_BitsPerSample( vlc_fourcc_t i_format ) VLC_USED; VLC_API void aout_FormatPrepare( audio_sample_format_t * p_format ); VLC_API void aout_FormatPrint(vlc_object_t *, const char *, const audio_sample_format_t *); #define aout_FormatPrint(o, t, f) aout_FormatPrint(VLC_OBJECT(o), t, f) VLC_API const char * aout_FormatPrintChannels( const audio_sample_format_t * ) VLC_USED; VLC_API float aout_VolumeGet (audio_output_t *); VLC_API int aout_VolumeSet (audio_output_t *, float); VLC_API int aout_MuteGet (audio_output_t *); VLC_API int aout_MuteSet (audio_output_t *, bool); VLC_API char *aout_DeviceGet (audio_output_t *); VLC_API int aout_DeviceSet (audio_output_t *, const char *); VLC_API int aout_DevicesList (audio_output_t *, char ***, char ***); /** * Report change of configured audio volume to the core and UI. */ static inline void aout_VolumeReport(audio_output_t *aout, float volume) { aout->event.volume_report(aout, volume); } /** * Report change of muted flag to the core and UI. */ static inline void aout_MuteReport(audio_output_t *aout, bool mute) { aout->event.mute_report(aout, mute); } /** * Report audio policy status. * \parm cork true to request a cork, false to undo any pending cork. */ static inline void aout_PolicyReport(audio_output_t *aout, bool cork) { aout->event.policy_report(aout, cork); } /** * Report change of output device. */ static inline void aout_DeviceReport(audio_output_t *aout, const char *id) { aout->event.device_report(aout, id); } /** * Report a device hot-plug event. * @param id device ID * @param name human-readable device name (NULL for hot unplug) */ static inline void aout_HotplugReport(audio_output_t *aout, const char *id, const char *name) { aout->event.hotplug_report(aout, id, name); } /** * Request a change of software audio amplification. * \param gain linear amplitude gain (must be positive) * \warning Values in excess 1.0 may cause overflow and distorsion. */ static inline int aout_GainRequest(audio_output_t *aout, float gain) { return aout->event.gain_request(aout, gain); } static inline void aout_RestartRequest(audio_output_t *aout, unsigned mode) { aout->event.restart_request(aout, mode); } static inline int aout_ChannelsRestart (vlc_object_t *obj, const char *varname, vlc_value_t oldval, vlc_value_t newval, void *data) { audio_output_t *aout = (audio_output_t *)obj; (void)varname; (void)oldval; (void)newval; (void)data; aout_RestartRequest (aout, AOUT_RESTART_OUTPUT); return 0; } /* Audio output filters */ typedef struct aout_filters aout_filters_t; typedef struct aout_request_vout aout_request_vout_t; VLC_API aout_filters_t *aout_FiltersNew(vlc_object_t *, const audio_sample_format_t *, const audio_sample_format_t *, const aout_request_vout_t *) VLC_USED; #define aout_FiltersNew(o,inf,outf,rv) \ aout_FiltersNew(VLC_OBJECT(o),inf,outf,rv) VLC_API void aout_FiltersDelete(vlc_object_t *, aout_filters_t *); #define aout_FiltersDelete(o,f) \ aout_FiltersDelete(VLC_OBJECT(o),f) VLC_API bool aout_FiltersAdjustResampling(aout_filters_t *, int); VLC_API block_t *aout_FiltersPlay(aout_filters_t *, block_t *, int rate); VLC_API vout_thread_t * aout_filter_RequestVout( filter_t *, vout_thread_t *p_vout, video_format_t *p_fmt ); #endif /* VLC_AOUT_H */