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 && AOUT_FMTS_SIMILAR(p_first, p_second) )
42 /* Check if i_rate == i_rate and i_channels == i_channels */
43 #define AOUT_FMTS_SIMILAR( p_first, p_second ) ( \
44 ((p_first)->i_rate == (p_second)->i_rate) \
45 && ((p_first)->i_physical_channels == (p_second)->i_physical_channels)\
46 && ((p_first)->i_original_channels == (p_second)->i_original_channels) )
48 #define VLC_CODEC_SPDIFL VLC_FOURCC('s','p','d','i')
49 #define VLC_CODEC_SPDIFB VLC_FOURCC('s','p','d','b')
51 #define AOUT_FMT_NON_LINEAR( p_format ) \
52 ( ((p_format)->i_format == VLC_CODEC_SPDIFL) \
53 || ((p_format)->i_format == VLC_CODEC_SPDIFB) \
54 || ((p_format)->i_format == VLC_CODEC_A52) \
55 || ((p_format)->i_format == VLC_CODEC_DTS) )
57 /* This is heavily borrowed from libmad, by Robert Leslie <rob@mars.org> */
59 * Fixed-point format: 0xABBBBBBB
60 * A == whole part (sign + 3 bits)
61 * B == fractional part (28 bits)
63 * Values are signed two's complement, so the effective range is:
64 * 0x80000000 to 0x7fffffff
65 * -8.0 to +7.9999999962747097015380859375
67 * The smallest representable value is:
68 * 0x00000001 == 0.0000000037252902984619140625 (i.e. about 3.725e-9)
70 * 28 bits of fractional accuracy represent about
71 * 8.6 digits of decimal accuracy.
73 * Fixed-point numbers can be added or subtracted as normal
74 * integers, but multiplication requires shifting the 64-bit result
75 * from 56 fractional bits back to 28 (and rounding.)
77 typedef int32_t vlc_fixed_t;
78 #define FIXED32_FRACBITS 28
79 #define FIXED32_MIN ((vlc_fixed_t) -0x80000000L)
80 #define FIXED32_MAX ((vlc_fixed_t) +0x7fffffffL)
81 #define FIXED32_ONE ((vlc_fixed_t) 0x10000000)
84 * Channels descriptions
87 /* Values available for physical and original channels */
88 #define AOUT_CHAN_CENTER 0x1
89 #define AOUT_CHAN_LEFT 0x2
90 #define AOUT_CHAN_RIGHT 0x4
91 #define AOUT_CHAN_REARCENTER 0x10
92 #define AOUT_CHAN_REARLEFT 0x20
93 #define AOUT_CHAN_REARRIGHT 0x40
94 #define AOUT_CHAN_MIDDLELEFT 0x100
95 #define AOUT_CHAN_MIDDLERIGHT 0x200
96 #define AOUT_CHAN_LFE 0x1000
98 /* Values available for original channels only */
99 #define AOUT_CHAN_DOLBYSTEREO 0x10000
100 #define AOUT_CHAN_DUALMONO 0x20000
101 #define AOUT_CHAN_REVERSESTEREO 0x40000
103 #define AOUT_CHAN_PHYSMASK 0xFFFF
104 #define AOUT_CHAN_MAX 9
106 /* Values used for the audio-device and audio-channels object variables */
107 #define AOUT_VAR_MONO 1
108 #define AOUT_VAR_STEREO 2
109 #define AOUT_VAR_2F2R 4
110 #define AOUT_VAR_3F2R 5
111 #define AOUT_VAR_5_1 6
112 #define AOUT_VAR_6_1 7
113 #define AOUT_VAR_7_1 8
114 #define AOUT_VAR_SPDIF 10
116 #define AOUT_VAR_CHAN_STEREO 1
117 #define AOUT_VAR_CHAN_RSTEREO 2
118 #define AOUT_VAR_CHAN_LEFT 3
119 #define AOUT_VAR_CHAN_RIGHT 4
120 #define AOUT_VAR_CHAN_DOLBYS 5
122 /*****************************************************************************
123 * Main audio output structures
124 *****************************************************************************/
126 #define aout_BufferFree( buffer ) block_Release( buffer )
128 /* Size of a frame for S/PDIF output. */
129 #define AOUT_SPDIF_SIZE 6144
131 /* Number of samples in an A/52 frame. */
132 #define A52_FRAME_NB 1536
134 /* Max input rate factor (1/4 -> 4) */
135 #define AOUT_MAX_INPUT_RATE (4)
137 /** allocation of memory in the audio output */
138 typedef struct aout_alloc_t
144 /** audio output buffer FIFO */
147 aout_buffer_t * p_first;
148 aout_buffer_t ** pp_last;
152 /* FIXME to remove once aout.h is cleaned a bit more */
153 #include <vlc_aout_mixer.h>
154 #include <vlc_block.h>
156 /** audio output filter */
157 typedef struct aout_filter_owner_sys_t aout_filter_owner_sys_t;
158 typedef struct aout_filter_sys_t aout_filter_sys_t;
164 aout_filter_sys_t *p_sys;
169 aout_alloc_t output_alloc;
173 void (*pf_do_work)( aout_instance_t *, aout_filter_t *,
174 aout_buffer_t *, aout_buffer_t * );
176 /* Private structure for the owner of the filter */
177 aout_filter_owner_sys_t *p_owner;
180 #define AOUT_RESAMPLING_NONE 0
181 #define AOUT_RESAMPLING_UP 1
182 #define AOUT_RESAMPLING_DOWN 2
184 /** an output stream for the audio output */
185 typedef struct aout_output_t
187 audio_sample_format_t output;
188 /* Indicates whether the audio output is currently starving, to avoid
189 * printing a 1,000 "output is starving" messages. */
193 filter_t * pp_filters[AOUT_MAX_FILTERS];
198 struct module_t * p_module;
199 struct aout_sys_t * p_sys;
200 void (* pf_play)( aout_instance_t * );
201 int (* pf_volume_get )( aout_instance_t *, audio_volume_t * );
202 int (* pf_volume_set )( aout_instance_t *, audio_volume_t );
205 /* Current volume for the output - it's just a placeholder, the plug-in
206 * may or may not use it. */
207 audio_volume_t i_volume;
209 /* If b_error == 1, there is no audio output pipeline. */
213 /** audio output thread descriptor */
214 struct aout_instance_t
218 /* Locks : please note that if you need several of these locks, it is
219 * mandatory (to avoid deadlocks) to take them in the following order :
220 * mixer_lock, p_input->lock, output_fifo_lock, input_fifos_lock.
222 /* When input_fifos_lock is taken, none of the p_input->fifo structures
223 * can be read or modified by a third-party thread. */
224 vlc_mutex_t input_fifos_lock;
225 /* When mixer_lock is taken, all decoder threads willing to mix a
226 * buffer must wait until it is released. The output pipeline cannot
227 * be modified. No input stream can be added or removed. */
228 vlc_mutex_t mixer_lock;
229 /* When output_fifo_lock is taken, the p_aout->output.fifo structure
230 * cannot be read or written by a third-party thread. */
231 vlc_mutex_t output_fifo_lock;
232 /* volume_vars_lock is taken */
233 vlc_mutex_t volume_vars_lock;
235 /* Input streams & pre-filters */
236 aout_input_t * pp_inputs[AOUT_MAX_INPUTS];
240 audio_sample_format_t mixer_format;
241 aout_alloc_t mixer_allocation;
242 float mixer_multiplier;
243 aout_mixer_t *p_mixer;
246 aout_output_t output;
250 * It describes the audio channel order VLC expect.
252 static const uint32_t pi_vlc_chan_order_wg4[] =
254 AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
255 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
256 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, AOUT_CHAN_REARCENTER,
257 AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0
260 /*****************************************************************************
262 *****************************************************************************/
264 VLC_EXPORT( aout_buffer_t *, aout_OutputNextBuffer, ( aout_instance_t *, mtime_t, bool ) LIBVLC_USED );
267 * This function computes the reordering needed to go from pi_chan_order_in to
269 * If pi_chan_order_in or pi_chan_order_out is NULL, it will assume that vlc
270 * internal (WG4) order is requested.
272 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 ) );
273 VLC_EXPORT( void, aout_ChannelReorder, ( uint8_t *, int, int, const int *, int ) );
276 * This fonction will compute the extraction parameter into pi_selection to go
277 * from i_channels with their type given by pi_order_src[] into the order
278 * describe by pi_order_dst.
280 * - *pi_channels as the number of channels that will be extracted which is
281 * lower (in case of non understood channels type) or equal to i_channels.
282 * - the layout of the channels (*pi_layout).
284 * It will return true if channel extraction is really needed, in which case
285 * aout_ChannelExtract must be used
287 * XXX It must be used when the source may have channel type not understood
288 * by VLC. In this case the channel type pi_order_src[] must be set to 0.
289 * XXX It must also be used if multiple channels have the same type.
291 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 ) );
294 * Do the actual channels extraction using the parameters created by
295 * aout_CheckChannelExtraction.
297 * XXX this function does not work in place (p_dst and p_src must not overlap).
298 * XXX Only 8, 16, 24, 32, 64 bits per sample are supported.
300 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 ) );
303 VLC_EXPORT( unsigned int, aout_FormatNbChannels, ( const audio_sample_format_t * p_format ) LIBVLC_USED );
304 VLC_EXPORT( unsigned int, aout_BitsPerSample, ( vlc_fourcc_t i_format ) LIBVLC_USED );
305 VLC_EXPORT( void, aout_FormatPrepare, ( audio_sample_format_t * p_format ) );
306 VLC_EXPORT( void, aout_FormatPrint, ( aout_instance_t * p_aout, const char * psz_text, const audio_sample_format_t * p_format ) );
307 VLC_EXPORT( const char *, aout_FormatPrintChannels, ( const audio_sample_format_t * ) LIBVLC_USED );
309 VLC_EXPORT( mtime_t, aout_FifoFirstDate, ( aout_instance_t *, aout_fifo_t * ) LIBVLC_USED );
310 VLC_EXPORT( aout_buffer_t *, aout_FifoPop, ( aout_instance_t * p_aout, aout_fifo_t * p_fifo ) LIBVLC_USED );
313 VLC_EXPORT( void, aout_VolumeSoftInit, ( aout_instance_t * ) );
314 VLC_EXPORT( void, aout_VolumeNoneInit, ( aout_instance_t * ) );
315 VLC_EXPORT( int, aout_VolumeGet, ( vlc_object_t *, audio_volume_t * ) );
316 #define aout_VolumeGet(a, b) aout_VolumeGet(VLC_OBJECT(a), b)
317 VLC_EXPORT( int, aout_VolumeSet, ( vlc_object_t *, audio_volume_t ) );
318 #define aout_VolumeSet(a, b) aout_VolumeSet(VLC_OBJECT(a), b)
319 VLC_EXPORT( int, aout_VolumeUp, ( vlc_object_t *, int, audio_volume_t * ) );
320 #define aout_VolumeUp(a, b, c) aout_VolumeUp(VLC_OBJECT(a), b, c)
321 VLC_EXPORT( int, aout_VolumeDown, ( vlc_object_t *, int, audio_volume_t * ) );
322 #define aout_VolumeDown(a, b, c) aout_VolumeDown(VLC_OBJECT(a), b, c)
323 VLC_EXPORT( int, aout_ToggleMute, ( vlc_object_t *, audio_volume_t * ) );
324 #define aout_ToggleMute(a, b) aout_ToggleMute(VLC_OBJECT(a), b)
325 VLC_EXPORT( int, aout_SetMute, ( vlc_object_t *, audio_volume_t *, bool ) );
326 VLC_EXPORT( bool, aout_IsMuted, ( vlc_object_t * ) );
327 VLC_EXPORT( int, aout_FindAndRestart, ( vlc_object_t *, const char *, vlc_value_t, vlc_value_t, void * ) );
328 VLC_EXPORT( int, aout_ChannelsRestart, ( vlc_object_t *, const char *, vlc_value_t, vlc_value_t, void * ) );
330 VLC_EXPORT( void, aout_EnableFilter, (vlc_object_t *, const char *, bool ));
331 #define aout_EnableFilter( o, n, b ) \
332 aout_EnableFilter( VLC_OBJECT(o), n, b )
335 VLC_EXPORT( vout_thread_t *, aout_filter_RequestVout, ( filter_t *, vout_thread_t *p_vout, video_format_t *p_fmt ) );
341 #endif /* _VLC_AOUT_H */