1 /*****************************************************************************
2 * audio_output.h : audio output interface
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: audio_output.h,v 1.85 2003/11/16 22:54:11 gbazin Exp $
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
23 #ifndef _VLC_AUDIO_OUTPUT_H
24 #define _VLC_AUDIO_OUTPUT_H 1
26 /*****************************************************************************
27 * audio_sample_format_t
28 *****************************************************************************
29 * This structure defines a format for audio samples.
30 *****************************************************************************/
33 vlc_fourcc_t i_format;
37 /* Describes the channels configuration of the samples (ie. number of
38 * channels which are available in the buffer, and positions). */
39 uint32_t i_physical_channels;
41 /* Describes from which original channels, before downmixing, the
42 * buffer is derived. */
43 uint32_t i_original_channels;
45 /* Optional - for A/52, SPDIF and DTS types : */
46 /* Bytes used by one compressed frame, depends on bitrate. */
47 unsigned int i_bytes_per_frame;
49 /* Number of sampleframes contained in one compressed frame. */
50 unsigned int i_frame_length;
51 /* Please note that it may be completely arbitrary - buffers are not
52 * obliged to contain a integral number of so-called "frames". It's
53 * just here for the division :
54 * buffer_size = i_nb_samples * i_bytes_per_frame / i_frame_length
57 /* FIXME ? (used by the codecs) */
63 #define AOUT_FMTS_IDENTICAL( p_first, p_second ) ( \
64 ((p_first)->i_format == (p_second)->i_format) \
65 && ((p_first)->i_rate == (p_second)->i_rate) \
66 && ((p_first)->i_physical_channels == (p_second)->i_physical_channels)\
67 && ((p_first)->i_original_channels == (p_second)->i_original_channels) )
69 /* Check if i_rate == i_rate and i_channels == i_channels */
70 #define AOUT_FMTS_SIMILAR( p_first, p_second ) ( \
71 ((p_first)->i_rate == (p_second)->i_rate) \
72 && ((p_first)->i_physical_channels == (p_second)->i_physical_channels)\
73 && ((p_first)->i_original_channels == (p_second)->i_original_channels) )
75 #ifdef WORDS_BIGENDIAN
76 # define AOUT_FMT_S16_NE VLC_FOURCC('s','1','6','b')
77 # define AOUT_FMT_U16_NE VLC_FOURCC('u','1','6','b')
79 # define AOUT_FMT_S16_NE VLC_FOURCC('s','1','6','l')
80 # define AOUT_FMT_U16_NE VLC_FOURCC('u','1','6','l')
83 #define AOUT_FMT_NON_LINEAR( p_format ) \
84 ( ((p_format)->i_format == VLC_FOURCC('s','p','d','i')) \
85 || ((p_format)->i_format == VLC_FOURCC('a','5','2',' ')) \
86 || ((p_format)->i_format == VLC_FOURCC('d','t','s',' ')) )
88 /* This is heavily borrowed from libmad, by Robert Leslie <rob@mars.org> */
90 * Fixed-point format: 0xABBBBBBB
91 * A == whole part (sign + 3 bits)
92 * B == fractional part (28 bits)
94 * Values are signed two's complement, so the effective range is:
95 * 0x80000000 to 0x7fffffff
96 * -8.0 to +7.9999999962747097015380859375
98 * The smallest representable value is:
99 * 0x00000001 == 0.0000000037252902984619140625 (i.e. about 3.725e-9)
101 * 28 bits of fractional accuracy represent about
102 * 8.6 digits of decimal accuracy.
104 * Fixed-point numbers can be added or subtracted as normal
105 * integers, but multiplication requires shifting the 64-bit result
106 * from 56 fractional bits back to 28 (and rounding.)
108 typedef int32_t vlc_fixed_t;
109 #define FIXED32_FRACBITS 28
110 #define FIXED32_MIN ((vlc_fixed_t) -0x80000000L)
111 #define FIXED32_MAX ((vlc_fixed_t) +0x7fffffffL)
112 #define FIXED32_ONE ((vlc_fixed_t) 0x10000000)
116 * Channels descriptions
119 /* Values available for physical and original channels */
120 #define AOUT_CHAN_CENTER 0x1
121 #define AOUT_CHAN_LEFT 0x2
122 #define AOUT_CHAN_RIGHT 0x4
123 #define AOUT_CHAN_REARCENTER 0x10
124 #define AOUT_CHAN_REARLEFT 0x20
125 #define AOUT_CHAN_REARRIGHT 0x40
126 #define AOUT_CHAN_MIDDLELEFT 0x100
127 #define AOUT_CHAN_MIDDLERIGHT 0x200
128 #define AOUT_CHAN_LFE 0x1000
130 /* Values available for original channels only */
131 #define AOUT_CHAN_DOLBYSTEREO 0x10000
132 #define AOUT_CHAN_DUALMONO 0x20000
133 #define AOUT_CHAN_REVERSESTEREO 0x40000
135 #define AOUT_CHAN_PHYSMASK 0xFFFF
137 /* Values used for the audio-device and audio-channels object variables */
138 #define AOUT_VAR_MONO 1
139 #define AOUT_VAR_STEREO 2
140 #define AOUT_VAR_2F2R 4
141 #define AOUT_VAR_3F2R 5
142 #define AOUT_VAR_5_1 6
143 #define AOUT_VAR_6_1 7
144 #define AOUT_VAR_7_1 8
145 #define AOUT_VAR_SPDIF 10
147 #define AOUT_VAR_CHAN_STEREO 1
148 #define AOUT_VAR_CHAN_RSTEREO 2
149 #define AOUT_VAR_CHAN_LEFT 3
150 #define AOUT_VAR_CHAN_RIGHT 4
151 #define AOUT_VAR_CHAN_DOLBYS 5
153 /*****************************************************************************
154 * aout_buffer_t : audio output buffer
155 *****************************************************************************/
160 /* i_size is the real size of the buffer (used for debug ONLY), i_nb_bytes
161 * is the number of significative bytes in it. */
162 size_t i_size, i_nb_bytes;
163 unsigned int i_nb_samples;
164 mtime_t start_date, end_date;
166 struct aout_buffer_t * p_next;
169 /* Size of a frame for S/PDIF output. */
170 #define AOUT_SPDIF_SIZE 6144
172 /* Number of samples in an A/52 frame. */
173 #define A52_FRAME_NB 1536
175 /*****************************************************************************
176 * audio_date_t : date incrementation without long-term rounding errors
177 *****************************************************************************/
182 uint32_t i_remainder;
185 /*****************************************************************************
187 *****************************************************************************/
188 /* From common.c : */
189 #define aout_New(a) __aout_New(VLC_OBJECT(a))
190 VLC_EXPORT( aout_instance_t *, __aout_New, ( vlc_object_t * ) );
191 VLC_EXPORT( void, aout_Delete, ( aout_instance_t * ) );
192 VLC_EXPORT( void, aout_DateInit, ( audio_date_t *, uint32_t ) );
193 VLC_EXPORT( void, aout_DateSet, ( audio_date_t *, mtime_t ) );
194 VLC_EXPORT( void, aout_DateMove, ( audio_date_t *, mtime_t ) );
195 VLC_EXPORT( mtime_t, aout_DateGet, ( const audio_date_t * ) );
196 VLC_EXPORT( mtime_t, aout_DateIncrement, ( audio_date_t *, uint32_t ) );
199 #define aout_DecNew(a, b, c) __aout_DecNew(VLC_OBJECT(a), b, c)
200 VLC_EXPORT( aout_input_t *, __aout_DecNew, ( vlc_object_t *, aout_instance_t **, audio_sample_format_t * ) );
201 VLC_EXPORT( int, aout_DecDelete, ( aout_instance_t *, aout_input_t * ) );
202 VLC_EXPORT( aout_buffer_t *, aout_DecNewBuffer, ( aout_instance_t *, aout_input_t *, size_t ) );
203 VLC_EXPORT( void, aout_DecDeleteBuffer, ( aout_instance_t *, aout_input_t *, aout_buffer_t * ) );
204 VLC_EXPORT( int, aout_DecPlay, ( aout_instance_t *, aout_input_t *, aout_buffer_t * ) );
207 #define aout_VolumeGet(a, b) __aout_VolumeGet(VLC_OBJECT(a), b)
208 VLC_EXPORT( int, __aout_VolumeGet, ( vlc_object_t *, audio_volume_t * ) );
209 #define aout_VolumeSet(a, b) __aout_VolumeSet(VLC_OBJECT(a), b)
210 VLC_EXPORT( int, __aout_VolumeSet, ( vlc_object_t *, audio_volume_t ) );
211 #define aout_VolumeInfos(a, b) __aout_VolumeInfos(VLC_OBJECT(a), b)
212 VLC_EXPORT( int, __aout_VolumeInfos, ( vlc_object_t *, audio_volume_t * ) );
213 #define aout_VolumeUp(a, b, c) __aout_VolumeUp(VLC_OBJECT(a), b, c)
214 VLC_EXPORT( int, __aout_VolumeUp, ( vlc_object_t *, int, audio_volume_t * ) );
215 #define aout_VolumeDown(a, b, c) __aout_VolumeDown(VLC_OBJECT(a), b, c)
216 VLC_EXPORT( int, __aout_VolumeDown, ( vlc_object_t *, int, audio_volume_t * ) );
217 #define aout_VolumeMute(a, b) __aout_VolumeMute(VLC_OBJECT(a), b)
218 VLC_EXPORT( int, __aout_VolumeMute, ( vlc_object_t *, audio_volume_t * ) );
219 VLC_EXPORT( int, aout_Restart, ( aout_instance_t * p_aout ) );
220 VLC_EXPORT( int, aout_FindAndRestart, ( vlc_object_t *, const char *, vlc_value_t, vlc_value_t, void * ) );
221 VLC_EXPORT( int, aout_ChannelsRestart, ( vlc_object_t *, const char *, vlc_value_t, vlc_value_t, void * ) );
223 #endif /* _VLC_AUDIO_OUTPUT_H */