1 /*****************************************************************************
2 * audio_output.h : audio output interface
3 *****************************************************************************
4 * Copyright (C) 2002-2005 the VideoLAN team
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
29 * This file defines functions, structures and macros for audio output object
38 #define AOUT_FMTS_IDENTICAL( p_first, p_second ) ( \
39 ((p_first)->i_format == (p_second)->i_format) \
40 && ((p_first)->i_rate == (p_second)->i_rate) \
41 && ((p_first)->i_physical_channels == (p_second)->i_physical_channels)\
42 && ((p_first)->i_original_channels == (p_second)->i_original_channels) )
44 /* Check if i_rate == i_rate and i_channels == i_channels */
45 #define AOUT_FMTS_SIMILAR( p_first, p_second ) ( \
46 ((p_first)->i_rate == (p_second)->i_rate) \
47 && ((p_first)->i_physical_channels == (p_second)->i_physical_channels)\
48 && ((p_first)->i_original_channels == (p_second)->i_original_channels) )
50 #ifdef WORDS_BIGENDIAN
51 # define AOUT_FMT_S16_NE VLC_FOURCC('s','1','6','b')
52 # define AOUT_FMT_U16_NE VLC_FOURCC('u','1','6','b')
53 # define AOUT_FMT_S24_NE VLC_FOURCC('s','2','4','b')
54 # define AOUT_FMT_S32_NE VLC_FOURCC('s','3','2','b')
55 # define AOUT_FMT_SPDIF_NE VLC_FOURCC('s','p','d','b')
57 # define AOUT_FMT_S16_NE VLC_FOURCC('s','1','6','l')
58 # define AOUT_FMT_U16_NE VLC_FOURCC('u','1','6','l')
59 # define AOUT_FMT_S24_NE VLC_FOURCC('s','2','4','l')
60 # define AOUT_FMT_S32_NE VLC_FOURCC('s','3','2','l')
61 # define AOUT_FMT_SPDIF_NE VLC_FOURCC('s','p','d','i')
64 #define AOUT_FMT_NON_LINEAR( p_format ) \
65 ( ((p_format)->i_format == VLC_FOURCC('s','p','d','i')) \
66 || ((p_format)->i_format == VLC_FOURCC('s','p','d','b')) \
67 || ((p_format)->i_format == VLC_FOURCC('a','5','2',' ')) \
68 || ((p_format)->i_format == VLC_FOURCC('d','t','s',' ')) )
70 /* This is heavily borrowed from libmad, by Robert Leslie <rob@mars.org> */
72 * Fixed-point format: 0xABBBBBBB
73 * A == whole part (sign + 3 bits)
74 * B == fractional part (28 bits)
76 * Values are signed two's complement, so the effective range is:
77 * 0x80000000 to 0x7fffffff
78 * -8.0 to +7.9999999962747097015380859375
80 * The smallest representable value is:
81 * 0x00000001 == 0.0000000037252902984619140625 (i.e. about 3.725e-9)
83 * 28 bits of fractional accuracy represent about
84 * 8.6 digits of decimal accuracy.
86 * Fixed-point numbers can be added or subtracted as normal
87 * integers, but multiplication requires shifting the 64-bit result
88 * from 56 fractional bits back to 28 (and rounding.)
90 typedef int32_t vlc_fixed_t;
91 #define FIXED32_FRACBITS 28
92 #define FIXED32_MIN ((vlc_fixed_t) -0x80000000L)
93 #define FIXED32_MAX ((vlc_fixed_t) +0x7fffffffL)
94 #define FIXED32_ONE ((vlc_fixed_t) 0x10000000)
97 * Channels descriptions
100 /* Values available for physical and original channels */
101 #define AOUT_CHAN_CENTER 0x1
102 #define AOUT_CHAN_LEFT 0x2
103 #define AOUT_CHAN_RIGHT 0x4
104 #define AOUT_CHAN_REARCENTER 0x10
105 #define AOUT_CHAN_REARLEFT 0x20
106 #define AOUT_CHAN_REARRIGHT 0x40
107 #define AOUT_CHAN_MIDDLELEFT 0x100
108 #define AOUT_CHAN_MIDDLERIGHT 0x200
109 #define AOUT_CHAN_LFE 0x1000
111 /* Values available for original channels only */
112 #define AOUT_CHAN_DOLBYSTEREO 0x10000
113 #define AOUT_CHAN_DUALMONO 0x20000
114 #define AOUT_CHAN_REVERSESTEREO 0x40000
116 #define AOUT_CHAN_PHYSMASK 0xFFFF
117 #define AOUT_CHAN_MAX 9
119 /* Values used for the audio-device and audio-channels object variables */
120 #define AOUT_VAR_MONO 1
121 #define AOUT_VAR_STEREO 2
122 #define AOUT_VAR_2F2R 4
123 #define AOUT_VAR_3F2R 5
124 #define AOUT_VAR_5_1 6
125 #define AOUT_VAR_6_1 7
126 #define AOUT_VAR_7_1 8
127 #define AOUT_VAR_SPDIF 10
129 #define AOUT_VAR_CHAN_STEREO 1
130 #define AOUT_VAR_CHAN_RSTEREO 2
131 #define AOUT_VAR_CHAN_LEFT 3
132 #define AOUT_VAR_CHAN_RIGHT 4
133 #define AOUT_VAR_CHAN_DOLBYS 5
135 /*****************************************************************************
136 * Main audio output structures
137 *****************************************************************************/
139 /** audio output buffer */
144 /* i_size is the real size of the buffer (used for debug ONLY), i_nb_bytes
145 * is the number of significative bytes in it. */
146 size_t i_size, i_nb_bytes;
147 unsigned int i_nb_samples;
148 mtime_t start_date, end_date;
149 bool b_discontinuity; /* Set on discontinuity (for non pcm stream) */
151 struct aout_buffer_t * p_next;
153 /** Private data (aout_buffer_t will disappear soon so no need for an
154 * aout_buffer_sys_t type) */
157 /** This way the release can be overloaded */
158 void (*pf_release)( aout_buffer_t * );
161 #define aout_BufferFree( p_buffer ) do { \
162 if( p_buffer != NULL && (p_buffer)->i_alloc_type == AOUT_ALLOC_HEAP ) \
166 p_buffer = NULL; } while(0)
168 /* Size of a frame for S/PDIF output. */
169 #define AOUT_SPDIF_SIZE 6144
171 /* Number of samples in an A/52 frame. */
172 #define A52_FRAME_NB 1536
174 /* Max input rate factor (1/4 -> 4) */
175 #define AOUT_MAX_INPUT_RATE (4)
177 /** date incrementation helper structure without long-term
184 uint32_t i_remainder;
187 /** allocation of memory in the audio output */
188 typedef struct aout_alloc_t
194 #define AOUT_ALLOC_NONE 0
195 #define AOUT_ALLOC_STACK 1
196 #define AOUT_ALLOC_HEAP 2
198 /** audio output mixer */
199 typedef struct aout_mixer_t
201 audio_sample_format_t mixer;
202 aout_alloc_t output_alloc;
205 struct aout_mixer_sys_t * p_sys;
206 void (* pf_do_work)( struct aout_instance_t *,
207 struct aout_buffer_t * );
209 /** If b_error == 1, there is no mixer. */
211 /** Multiplier used to raise or lower the volume of the sound in
212 * software. Beware, this creates sound distortion and should be avoided
213 * as much as possible. This isn't available for non-float32 mixer. */
217 /** audio output buffer FIFO */
220 aout_buffer_t * p_first;
221 aout_buffer_t ** pp_last;
222 audio_date_t end_date;
228 vout_thread_t *(*pf_request_vout)( void *,
229 vout_thread_t *, video_format_t * );
231 } aout_request_vout_t;
233 /** audio output filter */
234 typedef struct aout_filter_owner_sys_t aout_filter_owner_sys_t;
235 typedef struct aout_filter_sys_t aout_filter_sys_t;
240 audio_sample_format_t input;
241 audio_sample_format_t output;
242 aout_alloc_t output_alloc;
245 aout_filter_sys_t *p_sys;
250 void (*pf_do_work)( aout_instance_t *, aout_filter_t *,
251 aout_buffer_t *, aout_buffer_t * );
254 * XXX You MUST not use them directly */
257 * XXX use aout_filter_RequestVout */
258 aout_request_vout_t request_vout;
260 /* Private structure for the owner of the filter */
261 aout_filter_owner_sys_t *p_owner;
264 #define AOUT_RESAMPLING_NONE 0
265 #define AOUT_RESAMPLING_UP 1
266 #define AOUT_RESAMPLING_DOWN 2
267 /** an input stream for the audio output */
270 /* When this lock is taken, the pipeline cannot be changed by a
274 audio_sample_format_t input;
275 aout_alloc_t input_alloc;
278 aout_filter_t * pp_filters[AOUT_MAX_FILTERS];
281 aout_filter_t * p_playback_rate_filter;
284 aout_filter_t * pp_resamplers[AOUT_MAX_FILTERS];
286 int i_resampling_type;
287 mtime_t i_resamp_start_date;
288 int i_resamp_start_drift;
292 /* Mixer information */
293 uint8_t * p_first_byte_to_mix;
294 audio_replay_gain_t replay_gain;
297 /* If b_restart == 1, the input pipeline will be re-created. */
300 /* If b_error == 1, there is no input pipeline. */
303 /* Did we just change the output format? (expect buffer inconsistencies) */
306 /* last rate from input */
307 int i_last_input_rate;
314 mtime_t i_pause_date;
317 aout_request_vout_t request_vout;
320 /** an output stream for the audio output */
321 typedef struct aout_output_t
323 audio_sample_format_t output;
324 /* Indicates whether the audio output is currently starving, to avoid
325 * printing a 1,000 "output is starving" messages. */
329 aout_filter_t * pp_filters[AOUT_MAX_FILTERS];
334 struct module_t * p_module;
335 struct aout_sys_t * p_sys;
336 void (* pf_play)( aout_instance_t * );
337 int (* pf_volume_get )( aout_instance_t *, audio_volume_t * );
338 int (* pf_volume_set )( aout_instance_t *, audio_volume_t );
339 int (* pf_volume_infos )( aout_instance_t *, audio_volume_t * );
342 /* Current volume for the output - it's just a placeholder, the plug-in
343 * may or may not use it. */
344 audio_volume_t i_volume;
346 /* If b_error == 1, there is no audio output pipeline. */
350 /** audio output thread descriptor */
351 struct aout_instance_t
355 /* Locks : please note that if you need several of these locks, it is
356 * mandatory (to avoid deadlocks) to take them in the following order :
357 * mixer_lock, p_input->lock, output_fifo_lock, input_fifos_lock.
359 /* When input_fifos_lock is taken, none of the p_input->fifo structures
360 * can be read or modified by a third-party thread. */
361 vlc_mutex_t input_fifos_lock;
362 /* When mixer_lock is taken, all decoder threads willing to mix a
363 * buffer must wait until it is released. The output pipeline cannot
364 * be modified. No input stream can be added or removed. */
365 vlc_mutex_t mixer_lock;
366 /* When output_fifo_lock is taken, the p_aout->output.fifo structure
367 * cannot be read or written by a third-party thread. */
368 vlc_mutex_t output_fifo_lock;
370 /* Input streams & pre-filters */
371 aout_input_t * pp_inputs[AOUT_MAX_INPUTS];
378 aout_output_t output;
382 * It describes the audio channel order VLC except.
384 static const uint32_t pi_vlc_chan_order_wg4[] =
386 AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
387 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
388 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, AOUT_CHAN_REARCENTER,
389 AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0
392 /*****************************************************************************
394 *****************************************************************************/
396 /* From common.c : */
397 VLC_EXPORT( void, aout_DateInit, ( audio_date_t *, uint32_t ) );
398 VLC_EXPORT( void, aout_DateSet, ( audio_date_t *, mtime_t ) );
399 VLC_EXPORT( void, aout_DateMove, ( audio_date_t *, mtime_t ) );
400 VLC_EXPORT( mtime_t, aout_DateGet, ( const audio_date_t * ) LIBVLC_USED);
401 VLC_EXPORT( mtime_t, aout_DateIncrement, ( audio_date_t *, uint32_t ) );
403 VLC_EXPORT( aout_buffer_t *, aout_OutputNextBuffer, ( aout_instance_t *, mtime_t, bool ) LIBVLC_USED );
406 * This function computes the reordering needed to go from pi_chan_order_in to
408 * If pi_chan_order_in or pi_chan_order_out is NULL, it will assume that vlc
409 * internal (WG4) order is requested.
411 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 ) );
412 VLC_EXPORT( void, aout_ChannelReorder, ( uint8_t *, int, int, const int *, int ) );
414 VLC_EXPORT( unsigned int, aout_FormatNbChannels, ( const audio_sample_format_t * p_format ) LIBVLC_USED );
415 VLC_EXPORT( unsigned int, aout_BitsPerSample, ( vlc_fourcc_t i_format ) LIBVLC_USED );
416 VLC_EXPORT( void, aout_FormatPrepare, ( audio_sample_format_t * p_format ) );
417 VLC_EXPORT( void, aout_FormatPrint, ( aout_instance_t * p_aout, const char * psz_text, const audio_sample_format_t * p_format ) );
418 VLC_EXPORT( const char *, aout_FormatPrintChannels, ( const audio_sample_format_t * ) LIBVLC_USED );
420 VLC_EXPORT( mtime_t, aout_FifoFirstDate, ( aout_instance_t *, aout_fifo_t * ) LIBVLC_USED );
421 VLC_EXPORT( aout_buffer_t *, aout_FifoPop, ( aout_instance_t * p_aout, aout_fifo_t * p_fifo ) LIBVLC_USED );
424 VLC_EXPORT( void, aout_VolumeSoftInit, ( aout_instance_t * ) );
425 VLC_EXPORT( void, aout_VolumeNoneInit, ( aout_instance_t * ) );
426 #define aout_VolumeGet(a, b) __aout_VolumeGet(VLC_OBJECT(a), b)
427 VLC_EXPORT( int, __aout_VolumeGet, ( vlc_object_t *, audio_volume_t * ) );
428 #define aout_VolumeSet(a, b) __aout_VolumeSet(VLC_OBJECT(a), b)
429 VLC_EXPORT( int, __aout_VolumeSet, ( vlc_object_t *, audio_volume_t ) );
430 #define aout_VolumeInfos(a, b) __aout_VolumeInfos(VLC_OBJECT(a), b)
431 VLC_EXPORT( int, __aout_VolumeInfos, ( vlc_object_t *, audio_volume_t * ) );
432 #define aout_VolumeUp(a, b, c) __aout_VolumeUp(VLC_OBJECT(a), b, c)
433 VLC_EXPORT( int, __aout_VolumeUp, ( vlc_object_t *, int, audio_volume_t * ) );
434 #define aout_VolumeDown(a, b, c) __aout_VolumeDown(VLC_OBJECT(a), b, c)
435 VLC_EXPORT( int, __aout_VolumeDown, ( vlc_object_t *, int, audio_volume_t * ) );
436 #define aout_VolumeMute(a, b) __aout_VolumeMute(VLC_OBJECT(a), b)
437 VLC_EXPORT( int, __aout_VolumeMute, ( vlc_object_t *, audio_volume_t * ) );
438 VLC_EXPORT( int, aout_FindAndRestart, ( vlc_object_t *, const char *, vlc_value_t, vlc_value_t, void * ) );
439 VLC_EXPORT( int, aout_ChannelsRestart, ( vlc_object_t *, const char *, vlc_value_t, vlc_value_t, void * ) );
441 VLC_EXPORT( void, aout_EnableFilter, (vlc_object_t *, const char *, bool ));
443 #define aout_VisualNext(a) aout_VisualChange( VLC_OBJECT(a),1 )
444 #define aout_VisualPrev(a) aout_VisualChange( VLC_OBJECT(a),-1 )
446 VLC_EXPORT( char *, aout_VisualChange, (vlc_object_t *, int ) );
449 VLC_EXPORT( vout_thread_t *, aout_filter_RequestVout, ( aout_filter_t *, vout_thread_t *p_vout, video_format_t *p_fmt ) );
455 #endif /* _VLC_AOUT_H */