lxdream 0.9.1| filename | src/aica/audio.h |
| changeset | 91:61bb3ee00cf8 |
| prev | 82:81a4acf75f10 |
| next | 106:9048bac046c3 |
| author | nkeynes |
| date | Wed Feb 15 13:11:50 2006 +0000 (18 years ago) |
| permissions | -rw-r--r-- |
| last change | Split pvr2.c out to separate files for TA and renderer, minor renames change pvrdma to use mem_copy_to_sh4 |
| view | annotate | diff | log | raw |
1 /**
2 * $Id: audio.h,v 1.5 2006-02-05 04:01:55 nkeynes Exp $
3 *
4 * Audio engine, ie the part that does the actual work.
5 *
6 * Copyright (c) 2005 Nathan Keynes.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18 #ifndef dream_audio_H
19 #define dream_audio_H 1
21 #include <stdint.h>
22 #include <glib/gtypes.h>
24 #ifdef __cplusplus
25 extern "C" {
26 #endif
28 #define AUDIO_FMT_8BIT 0
29 #define AUDIO_FMT_16BIT 1
30 #define AUDIO_FMT_ADPCM 2
31 #define AUDIO_FMT_MONO 0
32 #define AUDIO_FMT_STEREO 4
33 #define AUDIO_FMT_SIGNED 0
34 #define AUDIO_FMT_UNSIGNED 8
37 typedef struct audio_channel {
38 gboolean active;
39 uint32_t posn;
40 uint32_t posn_left;
41 uint32_t start;
42 uint32_t end;
43 gboolean loop;
44 uint32_t loop_start;
45 int vol; /* 0..255 */
46 int pan; /* 0 (left) .. 31 (right) */
47 uint32_t sample_rate;
48 int sample_format;
49 /* Envelope etc stuff */
50 /* ADPCM */
51 int adpcm_nibble; /* 0 = low nibble, 1 = high nibble */
52 int adpcm_step;
53 int adpcm_predict;
54 } *audio_channel_t;
57 typedef struct audio_buffer {
58 uint32_t length; /* Bytes */
59 uint32_t posn; /* Bytes */
60 int status;
61 char data[0];
62 } *audio_buffer_t;
64 typedef struct audio_driver {
65 char *name;
66 gboolean (*set_output_format)( uint32_t sample_rate, uint32_t format );
67 gboolean (*process_buffer)( audio_buffer_t buffer );
68 } *audio_driver_t;
70 extern struct audio_driver null_audio_driver;
71 extern struct audio_driver esd_audio_driver;
73 /**
74 * Set the output driver, sample rate and format. Also initializes the
75 * output buffers, flushing any current data and reallocating as
76 * necessary. Must be called before attempting to generate any audio.
77 */
78 void audio_set_output( audio_driver_t driver, uint32_t samplerate,
79 int format );
81 /**
82 * Mark the current write buffer as full and prepare the next buffer for
83 * writing. Returns the next buffer to write to.
84 * If all buffers are full, returns NULL.
85 */
86 audio_buffer_t audio_next_write_buffer();
88 /**
89 * Mark the current read buffer as empty and return the next buffer for
90 * reading. If there is no next buffer yet, returns NULL.
91 */
92 audio_buffer_t audio_next_read_buffer();
94 /**
95 * Mix a single output sample and append it to the output buffers
96 */
97 void audio_mix_samples( int num_samples );
99 /**
100 * Retrieve the channel information for the channel, numbered 0..63.
101 */
102 audio_channel_t audio_get_channel( int channel );
104 void audio_start_channel( int channel );
105 void audio_stop_channel( int channel );
108 #ifdef __cplusplus
109 }
110 #endif
111 #endif
.