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456bed4a68
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768 lines
26 KiB
C
768 lines
26 KiB
C
/*****************************************************************************
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* vlc_aout.h : audio output interface
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*****************************************************************************
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* Copyright (C) 2002-2011 VLC authors and VideoLAN
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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 it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef VLC_AOUT_H
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#define VLC_AOUT_H 1
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#include <assert.h>
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#include <vlc_list.h>
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#include <vlc_es.h>
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/* FIXME to remove once aout.h is cleaned a bit more */
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#include <vlc_block.h>
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/**
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* \defgroup audio_output Audio output
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* \ingroup output
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* @{
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* \file
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* Audio output modules interface
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*/
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/* Buffers which arrive in advance of more than AOUT_MAX_ADVANCE_TIME
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* will be considered as bogus and be trashed */
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#define AOUT_MAX_ADVANCE_TIME (AOUT_MAX_PREPARE_TIME + VLC_TICK_FROM_SEC(1))
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/* Buffers which arrive in advance of more than AOUT_MAX_PREPARE_TIME
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* will cause the calling thread to sleep */
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#define AOUT_MAX_PREPARE_TIME VLC_TICK_FROM_SEC(2)
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/* Buffers which arrive after pts - AOUT_MIN_PREPARE_TIME will be trashed
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* to avoid too heavy resampling */
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#define AOUT_MIN_PREPARE_TIME AOUT_MAX_PTS_ADVANCE
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/* Tolerance values from EBU Recommendation 37 */
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/** Maximum advance of actual audio playback time to coded PTS,
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* above which downsampling will be performed */
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#define AOUT_MAX_PTS_ADVANCE VLC_TICK_FROM_MS(40)
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/** Maximum delay of actual audio playback time from coded PTS,
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* above which upsampling will be performed */
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#define AOUT_MAX_PTS_DELAY VLC_TICK_FROM_MS(60)
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/* Max acceptable resampling (in %) */
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#define AOUT_MAX_RESAMPLING 10
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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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&& AOUT_FMTS_SIMILAR(p_first, p_second) )
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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)->channel_type == (p_second)->channel_type) \
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&& ((p_first)->i_physical_channels == (p_second)->i_physical_channels)\
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&& ((p_first)->i_chan_mode == (p_second)->i_chan_mode) )
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#define AOUT_FMT_LINEAR( p_format ) \
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(aout_BitsPerSample((p_format)->i_format) != 0)
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#define VLC_CODEC_SPDIFL VLC_FOURCC('s','p','d','i')
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#define VLC_CODEC_SPDIFB VLC_FOURCC('s','p','d','b')
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#define AOUT_FMT_SPDIF( p_format ) \
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( ((p_format)->i_format == VLC_CODEC_SPDIFL) \
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|| ((p_format)->i_format == VLC_CODEC_SPDIFB) \
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|| ((p_format)->i_format == VLC_CODEC_A52) \
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|| ((p_format)->i_format == VLC_CODEC_DTS) )
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#define AOUT_FMT_HDMI( p_format ) \
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( (p_format)->i_format == VLC_CODEC_EAC3 \
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||(p_format)->i_format == VLC_CODEC_DTSHD \
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||(p_format)->i_format == VLC_CODEC_TRUEHD \
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||(p_format)->i_format == VLC_CODEC_MLP \
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)
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/* Values used for the audio-channels object variable */
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#define AOUT_VAR_CHAN_UNSET 0 /* must be zero */
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#define AOUT_VAR_CHAN_STEREO 1
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#define AOUT_VAR_CHAN_RSTEREO 2
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#define AOUT_VAR_CHAN_LEFT 3
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#define AOUT_VAR_CHAN_RIGHT 4
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#define AOUT_VAR_CHAN_DOLBYS 5
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/* deprecated: AOUT_VAR_CHAN_HEADPHONES 6, use AOUT_MIX_MODE_BINAURAL */
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#define AOUT_VAR_CHAN_MONO 7
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#define AOUT_MIX_MODE_UNSET 0
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#define AOUT_MIX_MODE_STEREO 1
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#define AOUT_MIX_MODE_BINAURAL 2
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#define AOUT_MIX_MODE_4_0 3
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#define AOUT_MIX_MODE_5_1 4
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#define AOUT_MIX_MODE_7_1 5
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/*****************************************************************************
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* Main audio output structures
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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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* \defgroup audio_output_module Audio output modules
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* @{
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*/
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struct vlc_audio_output_events {
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void (*timing_report)(audio_output_t *, vlc_tick_t system_ts, vlc_tick_t audio_ts);
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void (*drained_report)(audio_output_t *);
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void (*volume_report)(audio_output_t *, float);
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void (*mute_report)(audio_output_t *, bool);
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void (*policy_report)(audio_output_t *, bool);
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void (*device_report)(audio_output_t *, const char *);
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void (*hotplug_report)(audio_output_t *, const char *, const char *);
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void (*restart_request)(audio_output_t *, unsigned);
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int (*gain_request)(audio_output_t *, float);
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};
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/** Audio output object
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*
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* The audio output object is the abstraction for rendering decoded
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* (or pass-through) audio samples. In addition to playing samples,
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* the abstraction exposes controls for pause/resume, flush/drain,
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* changing the volume or mut flag, and listing and changing output device.
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*
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* An audio output can be in one of three different states:
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* stopped, playing or paused.
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* The audio output is always created in stopped state and is always destroyed
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* in that state also. It is moved from stopped to playing state by start(),
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* and from playing or paused states back to stopped state by stop().
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**/
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struct audio_output
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{
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struct vlc_object_t obj;
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void *sys; /**< Private data for callbacks */
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int (*start)(audio_output_t *, audio_sample_format_t *fmt);
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/**< Starts a new stream (mandatory, cannot be NULL).
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*
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* This callback changes the audio output from stopped to playing state
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* (if successful). After the callback returns, time_get(), play(),
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* pause(), flush() and eventually stop() callbacks may be called.
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*
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* \param fmt input stream sample format upon entry,
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* output stream sample format upon return [IN/OUT]
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* \return VLC_SUCCESS on success, non-zero on failure
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*
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* \note This callback can only be called while the audio output is in
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* stopped state. There can be only one stream per audio output at a time.
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*
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* \note This callbacks needs not be reentrant.
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*/
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void (*stop)(audio_output_t *);
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/**< Stops the existing stream (mandatory, cannot be NULL).
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*
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* This callback terminates the current audio stream,
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* and returns the audio output to stopped state.
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*
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* \note This callback needs not be reentrant.
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*/
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int (*time_get)(audio_output_t *, vlc_tick_t *delay);
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/**< Estimates playback buffer latency (can be NULL).
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*
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* This callback computes an estimation of the delay until the current
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* tail of the audio output buffer would be rendered. This is essential
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* for (lip) synchronization and long term drift between the audio output
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* clock and the media upstream clock (if any).
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*
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* If the audio output clock is exactly synchronized with the system
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* monotonic clock (i.e. vlc_tick_now()), then this callback is not
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* mandatory. In that case, drain must be implemented (since the default
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* implementation uses the delay to wait for the end of the stream).
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*
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* This callback is called before the first play() in order to get the
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* initial delay (the hw latency). Most modules won't be able to know this
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* latency before the first play. In that case, they should return -1 and
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* handle the first play() date, cf. play() documentation.
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*
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* \warning It is recommended to report the audio delay via
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* aout_TimingReport(). In that case, time_get should not be implemented.
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*
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* \param delay pointer to the delay until the next sample to be written
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* to the playback buffer is rendered [OUT]
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* \return 0 on success, non-zero on failure or lack of data
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*
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* \note This callback cannot be called in stopped state.
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*/
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void (*play)(audio_output_t *, block_t *block, vlc_tick_t date);
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/**< Queues a block of samples for playback (mandatory, cannot be NULL).
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*
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* The first play() date (after a flush()/start()) will be most likely in
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* the future. Modules that don't know the hw latency before a first play
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* (when they return -1 from the first time_get()) will need to handle
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* this. They can play a silence buffer with 'length = date - now()', or
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* configure their render callback to start at the given date.
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*
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* \param block block of audio samples
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* \param date intended system time to render the first sample
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*
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* \note This callback cannot be called in stopped state.
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*/
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void (*pause)( audio_output_t *, bool pause, vlc_tick_t date);
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/**< Pauses or resumes playback (mandatory, cannot be NULL).
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*
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* This callback pauses or resumes audio playback as quickly as possible.
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* When pausing, it is desirable to stop producing sound immediately, but
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* retain already queued audio samples in the buffer to play when later
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* when resuming.
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*
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* If pausing is impossible, then aout_PauseDefault() can provide a
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* fallback implementation of this callback.
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*
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* \param pause pause if true, resume from pause if false
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* \param date timestamp when the pause or resume was requested
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*
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* \note This callback cannot be called in stopped state.
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*/
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void (*flush)( audio_output_t *);
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/**< Flushes the playback buffers (mandatory, cannot be NULL).
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*
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* \note This callback cannot be called in stopped state.
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*/
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void (*drain)(audio_output_t *);
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/**< Drain the playback buffers asynchronously (can be NULL).
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*
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* A drain operation can be cancelled by aout->flush() or aout->stop().
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*
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* It is legal to continue playback after a drain_async, if flush() is
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* called before the next play().
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*
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* Call aout_DrainedReport() to notify that the stream is drained.
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*
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* If NULL, the caller will wait for the delay returned by time_get before
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* calling stop().
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*/
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int (*volume_set)(audio_output_t *, float volume);
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/**< Changes playback volume (optional, may be NULL).
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*
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* \param volume requested volume (0. = mute, 1. = nominal)
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*
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* \note The volume is always a positive number.
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*
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* \warning A stream may or may not have been started when called.
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* \warning This callback may be called concurrently with
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* time_get(), play(), pause() or flush().
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* It will however be protected against concurrent calls to
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* start(), stop(), volume_set(), mute_set() or device_select().
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*/
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int (*mute_set)(audio_output_t *, bool mute);
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/**< Changes muting (optional, may be NULL).
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*
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* \param mute true to mute, false to unmute
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* \warning The same constraints apply as with volume_set().
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*/
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int (*device_select)(audio_output_t *, const char *id);
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/**< Selects an audio output device (optional, may be NULL).
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*
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* \param id nul-terminated device unique identifier.
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* \return 0 on success, non-zero on failure.
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*
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* \warning The same constraints apply as with volume_set().
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*/
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struct {
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bool headphones; /**< Default to false, set it to true if the current
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sink is using headphones */
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} current_sink_info;
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/**< Current sink information set by the module from the start() function */
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const struct vlc_audio_output_events *events;
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};
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/**
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* Report a new timing point
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*
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* system_ts doesn't have to be close to vlc_tick_now(). Any valid { system_ts,
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* audio_ts } points in the past are sufficient to update the clock.
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*
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* \note audio_ts starts at 0 and should not take the block PTS into account.
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*
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* It is important to report the first point as soon as possible (and the
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* following points if the audio delay take some time to be stabilized). Once
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* the audio is stabilized, it is recommended to report timing points every few
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* seconds.
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*/
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static inline void aout_TimingReport(audio_output_t *aout, vlc_tick_t system_ts,
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vlc_tick_t audio_ts)
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{
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aout->events->timing_report(aout, system_ts, audio_ts);
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}
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/**
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* Report than the stream is drained (after a call to aout->drain_async)
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*/
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static inline void aout_DrainedReport(audio_output_t *aout)
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{
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aout->events->drained_report(aout);
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}
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/**
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* Report change of configured audio volume to the core and UI.
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*/
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static inline void aout_VolumeReport(audio_output_t *aout, float volume)
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{
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aout->events->volume_report(aout, volume);
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}
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/**
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* Report change of muted flag to the core and UI.
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*/
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static inline void aout_MuteReport(audio_output_t *aout, bool mute)
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{
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aout->events->mute_report(aout, mute);
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}
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/**
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* Report audio policy status.
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* \param cork true to request a cork, false to undo any pending cork.
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*/
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static inline void aout_PolicyReport(audio_output_t *aout, bool cork)
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{
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aout->events->policy_report(aout, cork);
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}
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/**
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* Report change of output device.
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*/
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static inline void aout_DeviceReport(audio_output_t *aout, const char *id)
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{
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aout->events->device_report(aout, id);
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}
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/**
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* Report a device hot-plug event.
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* @param id device ID
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* @param name human-readable device name (NULL for hot unplug)
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*/
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static inline void aout_HotplugReport(audio_output_t *aout,
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const char *id, const char *name)
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{
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aout->events->hotplug_report(aout, id, name);
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}
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/**
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* Request a change of software audio amplification.
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* \param gain linear amplitude gain (must be positive)
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* \warning Values in excess 1.0 may cause overflow and distorsion.
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*/
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static inline int aout_GainRequest(audio_output_t *aout, float gain)
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{
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return aout->events->gain_request(aout, gain);
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}
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static inline void aout_RestartRequest(audio_output_t *aout, unsigned mode)
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{
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aout->events->restart_request(aout, mode);
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}
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/**
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* Default implementation for audio_output_t.pause
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*
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* \warning This default callback implementation is suboptimal as it will
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* discard some audio samples.
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* Do not use this unless there are really no possible better alternatives.
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*/
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static inline void aout_PauseDefault(audio_output_t *aout, bool paused,
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vlc_tick_t date)
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{
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if (paused)
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aout->flush(aout);
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(void) date;
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}
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#define AOUT_RESTART_FILTERS 0x1
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#define AOUT_RESTART_OUTPUT (AOUT_RESTART_FILTERS|0x2)
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#define AOUT_RESTART_STEREOMODE (AOUT_RESTART_OUTPUT|0x4)
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/** @} */
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/**
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* \defgroup audio_format Audio formats
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* @{
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*/
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/**
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* It describes the audio channel order VLC expect.
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*/
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static const uint32_t pi_vlc_chan_order_wg4[] =
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{
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AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
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AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
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AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, AOUT_CHAN_REARCENTER,
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AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0
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};
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/**
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* This function computes the reordering needed to go from pi_chan_order_in to
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* pi_chan_order_out.
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* If pi_chan_order_in or pi_chan_order_out is NULL, it will assume that vlc
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* internal (WG4) order is requested.
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*/
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VLC_API unsigned aout_CheckChannelReorder( const uint32_t *, const uint32_t *,
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uint32_t mask, uint8_t *table );
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/**
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* Reorders audio samples within a block of linear audio interleaved samples.
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* \param ptr start address of the block of samples
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* \param bytes size of the block in bytes (must be a multiple of the product
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* of the channels count and the sample size)
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* \param channels channels count (also length of the chans_table table)
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* \param chans_table permutation table to reorder the channels
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* (usually computed by aout_CheckChannelReorder())
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* \param fourcc sample format (must be a linear sample format)
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* \note The samples must be naturally aligned in memory.
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*/
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VLC_API void aout_ChannelReorder(void *, size_t, uint8_t, const uint8_t *, vlc_fourcc_t);
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/**
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* This function will compute the extraction parameter into pi_selection to go
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* from i_channels with their type given by pi_order_src[] into the order
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* describe by pi_order_dst.
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* It will also set :
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* - *pi_channels as the number of channels that will be extracted which is
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* lower (in case of non understood channels type) or equal to i_channels.
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* - the layout of the channels (*pi_layout).
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*
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* It will return true if channel extraction is really needed, in which case
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* aout_ChannelExtract must be used
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*
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* XXX It must be used when the source may have channel type not understood
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* by VLC. In this case the channel type pi_order_src[] must be set to 0.
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* XXX It must also be used if multiple channels have the same type.
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*/
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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 );
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/**
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* Do the actual channels extraction using the parameters created by
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* aout_CheckChannelExtraction.
|
|
*
|
|
* XXX this function does not work in place (p_dst and p_src must not overlap).
|
|
* XXX Only 8, 16, 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 );
|
|
|
|
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);
|
|
|
|
/* */
|
|
static inline unsigned aout_FormatNbChannels(const audio_sample_format_t *fmt)
|
|
{
|
|
return vlc_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 );
|
|
|
|
/**
|
|
* Prints an audio sample format in a human-readable form.
|
|
*/
|
|
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;
|
|
|
|
/** @} */
|
|
|
|
#define AOUT_VOLUME_DEFAULT 256
|
|
#define AOUT_VOLUME_MAX 512
|
|
|
|
VLC_API float aout_VolumeGet (audio_output_t *);
|
|
VLC_API int aout_VolumeSet (audio_output_t *, float);
|
|
VLC_API int aout_VolumeUpdate (audio_output_t *, int, 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 ***);
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* \defgroup audio_filters Audio filters
|
|
* \ingroup filters
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Enable or disable an audio filter ("audio-filter")
|
|
*
|
|
* \param aout a valid audio output
|
|
* \param name a valid filter name
|
|
* \param add true to add the filter, false to remove it
|
|
* \return 0 on success, non-zero on failure.
|
|
*/
|
|
VLC_API int aout_EnableFilter(audio_output_t *aout, const char *name, bool add);
|
|
|
|
typedef enum
|
|
{
|
|
AOUT_CHANIDX_DISABLE = -1,
|
|
AOUT_CHANIDX_LEFT,
|
|
AOUT_CHANIDX_RIGHT,
|
|
AOUT_CHANIDX_MIDDLELEFT,
|
|
AOUT_CHANIDX_MIDDLERIGHT,
|
|
AOUT_CHANIDX_REARLEFT,
|
|
AOUT_CHANIDX_REARRIGHT,
|
|
AOUT_CHANIDX_REARCENTER,
|
|
AOUT_CHANIDX_CENTER,
|
|
AOUT_CHANIDX_LFE,
|
|
AOUT_CHANIDX_MAX
|
|
} vlc_chan_order_idx_t;
|
|
|
|
static_assert(AOUT_CHANIDX_MAX == AOUT_CHAN_MAX, "channel count mismatch");
|
|
|
|
#define AOUT_CHAN_REMAP_INIT { \
|
|
AOUT_CHANIDX_LEFT, \
|
|
AOUT_CHANIDX_RIGHT, \
|
|
AOUT_CHANIDX_MIDDLELEFT, \
|
|
AOUT_CHANIDX_MIDDLERIGHT, \
|
|
AOUT_CHANIDX_REARLEFT, \
|
|
AOUT_CHANIDX_REARRIGHT, \
|
|
AOUT_CHANIDX_REARCENTER, \
|
|
AOUT_CHANIDX_CENTER, \
|
|
AOUT_CHANIDX_LFE, \
|
|
}
|
|
|
|
typedef struct
|
|
{
|
|
/**
|
|
* If the remap order differs from the WG4 order, a remap audio filter will
|
|
* be inserted to remap channels according to this array.
|
|
*/
|
|
int remap[AOUT_CHANIDX_MAX];
|
|
/**
|
|
* If true, a filter will be inserted to add a headphones effect (like a
|
|
* binauralizer audio filter).
|
|
*/
|
|
bool headphones;
|
|
} aout_filters_cfg_t;
|
|
|
|
#define AOUT_FILTERS_CFG_INIT (aout_filters_cfg_t) \
|
|
{ .remap = AOUT_CHAN_REMAP_INIT, \
|
|
.headphones = false, \
|
|
};
|
|
|
|
typedef struct aout_filters aout_filters_t;
|
|
|
|
VLC_API aout_filters_t *aout_FiltersNew(vlc_object_t *,
|
|
const audio_sample_format_t *,
|
|
const audio_sample_format_t *,
|
|
const aout_filters_cfg_t *cfg) VLC_USED;
|
|
#define aout_FiltersNew(o,inf,outf,remap) \
|
|
aout_FiltersNew(VLC_OBJECT(o),inf,outf,remap)
|
|
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 *, float rate);
|
|
VLC_API block_t *aout_FiltersDrain(aout_filters_t *);
|
|
VLC_API void aout_FiltersFlush(aout_filters_t *);
|
|
VLC_API void aout_FiltersChangeViewpoint(aout_filters_t *, const vlc_viewpoint_t *vp);
|
|
|
|
/**
|
|
* Create a vout from an "visualization" audio filter.
|
|
*
|
|
* @warning Can only be called once, from the probe function (Open).
|
|
*
|
|
* @return a valid vout or NULL in case of error, the returned vout should not
|
|
* be freed via vout_Close().
|
|
*/
|
|
VLC_API vout_thread_t *aout_filter_GetVout(filter_t *, const video_format_t *);
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* @defgroup audio_output_meter Audio meter API
|
|
* \ingroup audio_output
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Audio loudness measurement
|
|
*/
|
|
struct vlc_audio_loudness
|
|
{
|
|
/** Momentary loudness (last 400 ms), in LUFS */
|
|
double loudness_momentary;
|
|
/** Short term loudness (last 3seconds), in LUFS */
|
|
double loudness_shortterm;
|
|
/** Integrated loudness (global), in LUFS */
|
|
double loudness_integrated;
|
|
/** Loudness range, in LU */
|
|
double loudness_range;
|
|
/** True Peak, in dBTP */
|
|
double truepeak;
|
|
};
|
|
|
|
/**
|
|
* Audio meter callback
|
|
*
|
|
* Triggered from vlc_audio_meter_Process() and vlc_audio_meter_Flush().
|
|
*/
|
|
struct vlc_audio_meter_cbs
|
|
{
|
|
/**
|
|
* Called when new loudness measurements are available
|
|
*
|
|
* @param date absolute date (likely in the future) of this measurement
|
|
* @param loudness pointer to the loudness measurement
|
|
* @param opaque pointer set by vlc_audio_meter_AddPlugin().
|
|
*/
|
|
void (*on_loudness)(vlc_tick_t date, const struct vlc_audio_loudness *loudness, void *data);
|
|
};
|
|
|
|
/**
|
|
* Audio meter plugin opaque structure
|
|
*
|
|
* This opaque structure is returned by vlc_audio_meter_AddPlugin().
|
|
*/
|
|
typedef struct vlc_audio_meter_plugin vlc_audio_meter_plugin;
|
|
|
|
/**
|
|
* Audio meter plugin owner structure
|
|
*
|
|
* Used to setup callbacks and private data
|
|
*
|
|
* Can be registered with vlc_audio_meter_AddPlugin().
|
|
*/
|
|
struct vlc_audio_meter_plugin_owner
|
|
{
|
|
const struct vlc_audio_meter_cbs *cbs;
|
|
void *sys;
|
|
};
|
|
|
|
/**
|
|
* Audio meter structure
|
|
*
|
|
* Initialise with vlc_audio_meter_Init()
|
|
*
|
|
* @warning variables of this struct should not be used directly
|
|
*/
|
|
struct vlc_audio_meter
|
|
{
|
|
vlc_mutex_t lock;
|
|
vlc_object_t *parent;
|
|
const audio_sample_format_t *fmt;
|
|
|
|
struct vlc_list plugins;
|
|
};
|
|
|
|
/**
|
|
* Initialize the audio meter structure
|
|
*
|
|
* @param meter allocated audio meter structure
|
|
* @param parent object that will be used to create audio filters
|
|
*/
|
|
VLC_API void
|
|
vlc_audio_meter_Init(struct vlc_audio_meter *meter, vlc_object_t *parent);
|
|
#define vlc_audio_meter_Init(a,b) vlc_audio_meter_Init(a, VLC_OBJECT(b))
|
|
|
|
/**
|
|
* Free allocated resource from the audio meter structure
|
|
*
|
|
* @param meter allocated audio meter structure
|
|
*/
|
|
VLC_API void
|
|
vlc_audio_meter_Destroy(struct vlc_audio_meter *meter);
|
|
|
|
/**
|
|
* Set or reset the audio format
|
|
*
|
|
* This will reload all plugins added with vlc_audio_meter_AddPlugin()
|
|
*
|
|
* @param meter audio meter structure
|
|
* @param fmt NULL to unload all plugins or a valid pointer to an audio format,
|
|
* must stay valid during the lifetime of the audio meter (until
|
|
* vlc_audio_meter_Reset() or vlc_audio_meter_Destroy() are called)
|
|
*
|
|
* @return VLC_SUCCESS on success, VLC_EGENERIC if a plugin failed to load
|
|
*/
|
|
VLC_API int
|
|
vlc_audio_meter_Reset(struct vlc_audio_meter *meter, const audio_sample_format_t *fmt);
|
|
|
|
/**
|
|
* Add an "audio meter" plugin
|
|
*
|
|
* The module to be loaded if meter->fmt is valid, otherwise, the module
|
|
* will be loaded from a next call to vlc_audio_meter_Reset()
|
|
*
|
|
* @param meter audio meter structure
|
|
* @param chain name of the module, can contain specific module options using
|
|
* the following chain convention:"name{option1=a,option2=b}"
|
|
* @param owner pointer to a vlc_audio_meter_plugin_owner structure, the
|
|
* structure must stay valid during the lifetime of the plugin
|
|
* @return a valid audio meter plugin, or NULL in case of error
|
|
*/
|
|
VLC_API vlc_audio_meter_plugin *
|
|
vlc_audio_meter_AddPlugin(struct vlc_audio_meter *meter, const char *chain,
|
|
const struct vlc_audio_meter_plugin_owner *owner);
|
|
|
|
/**
|
|
* Remove an "audio meter" plugin
|
|
*
|
|
* @param meter audio meter structure
|
|
* @param plugin plugin returned by vlc_audio_meter_AddPlugin()
|
|
*/
|
|
VLC_API void
|
|
vlc_audio_meter_RemovePlugin(struct vlc_audio_meter *meter, vlc_audio_meter_plugin *plugin);
|
|
|
|
/**
|
|
* Process an audio block
|
|
*
|
|
* vlc_audio_meter_events callbacks can be triggered from this function.
|
|
*
|
|
* @param meter audio meter structure
|
|
* @param block pointer to a block, this block won't be released of modified
|
|
* from this function
|
|
* @param date absolute date (likely in the future) when this block should be rendered
|
|
*/
|
|
VLC_API void
|
|
vlc_audio_meter_Process(struct vlc_audio_meter *meter, block_t *block, vlc_tick_t date);
|
|
|
|
/**
|
|
* Flush all "audio meter" plugins
|
|
*
|
|
* vlc_audio_meter_events callbacks can be triggered from this function.
|
|
*
|
|
* @param meter audio meter structure
|
|
*/
|
|
VLC_API void
|
|
vlc_audio_meter_Flush(struct vlc_audio_meter *meter);
|
|
|
|
/** @} */
|
|
|
|
#endif /* VLC_AOUT_H */
|