mirror of
https://code.videolan.org/videolan/vlc
synced 2024-09-04 09:11:33 +02:00
![Rémi Denis-Courmont](/assets/img/avatar_default.png)
They are mainly for audio_format_t which is also defined there. Many files included <vlc_aout.h> only for these.
265 lines
10 KiB
C
265 lines
10 KiB
C
/*****************************************************************************
|
|
* vlc_aout.h : audio output interface
|
|
*****************************************************************************
|
|
* Copyright (C) 2002-2011 VLC authors and VideoLAN
|
|
*
|
|
* 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 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
|
|
*/
|
|
|
|
/* Max number of pre-filters per input, and max number of post-filters */
|
|
#define AOUT_MAX_FILTERS 10
|
|
|
|
/* 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) )
|
|
|
|
/* 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)
|
|
|
|
/* 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
|
|
|
|
/* FIXME to remove once aout.h is cleaned a bit more */
|
|
#include <vlc_block.h>
|
|
|
|
typedef int (*aout_volume_cb) (audio_output_t *, float, bool);
|
|
|
|
/** Audio output object */
|
|
struct audio_output
|
|
{
|
|
VLC_COMMON_MEMBERS
|
|
|
|
audio_sample_format_t format; /**< Output format (plugin can modify it
|
|
only when succesfully probed and not afterward) */
|
|
|
|
struct aout_sys_t *sys; /**< Output plugin private data */
|
|
void (*pf_play)(audio_output_t *, block_t *); /**< Audio buffer callback */
|
|
void (* pf_pause)( audio_output_t *, bool, mtime_t ); /**< Pause/resume
|
|
callback (optional, may be NULL) */
|
|
void (* pf_flush)( audio_output_t *, bool ); /**< Flush/drain callback
|
|
(optional, may be NULL) */
|
|
aout_volume_cb pf_volume_set; /**< Volume setter (or NULL) */
|
|
};
|
|
|
|
/**
|
|
* 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
|
|
*****************************************************************************/
|
|
|
|
/**
|
|
* 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 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_API 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_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 & AOUT_CHAN_PHYSMASK);
|
|
}
|
|
|
|
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 void aout_VolumeNoneInit( audio_output_t * );
|
|
VLC_API void aout_VolumeSoftInit( audio_output_t * );
|
|
VLC_API void aout_VolumeHardInit( audio_output_t *, aout_volume_cb );
|
|
VLC_API void aout_VolumeHardSet( audio_output_t *, float, bool );
|
|
|
|
VLC_API void aout_TimeReport(audio_output_t *, mtime_t);
|
|
|
|
VLC_API int aout_ChannelsRestart( vlc_object_t *, const char *, vlc_value_t, vlc_value_t, void * );
|
|
|
|
/* */
|
|
VLC_API vout_thread_t * aout_filter_RequestVout( filter_t *, vout_thread_t *p_vout, video_format_t *p_fmt ) VLC_USED;
|
|
|
|
/** Audio output buffer FIFO */
|
|
struct aout_fifo_t
|
|
{
|
|
aout_buffer_t * p_first;
|
|
aout_buffer_t ** pp_last;
|
|
date_t end_date;
|
|
};
|
|
|
|
/* Legacy packet-oriented audio output helpers */
|
|
typedef struct
|
|
{
|
|
vlc_mutex_t lock;
|
|
aout_fifo_t partial; /**< Audio blocks before packetization */
|
|
aout_fifo_t fifo; /**< Packetized audio blocks */
|
|
mtime_t pause_date; /**< Date when paused or VLC_TS_INVALID */
|
|
mtime_t time_report; /**< Desynchronization estimate or VLC_TS_INVALID */
|
|
unsigned samples; /**< Samples per packet */
|
|
bool starving; /**< Whether currently starving (to limit error messages) */
|
|
} aout_packet_t;
|
|
|
|
VLC_API void aout_PacketInit(audio_output_t *, aout_packet_t *, unsigned);
|
|
VLC_API void aout_PacketDestroy(audio_output_t *);
|
|
|
|
VLC_API void aout_PacketPlay(audio_output_t *, block_t *);
|
|
VLC_API void aout_PacketPause(audio_output_t *, bool, mtime_t);
|
|
VLC_API void aout_PacketFlush(audio_output_t *, bool);
|
|
|
|
VLC_API block_t *aout_PacketNext(audio_output_t *, mtime_t) VLC_USED;
|
|
|
|
|
|
#endif /* VLC_AOUT_H */
|