1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
#define SDL_MAIN_HANDLED
#include <assert.h>
#include <SDL.h>
#include <stdlib.h>
#include <errno.h>
#include "til_audio.h"
#include "til_audio_context.h"
#include "til_settings.h"
#include "til_setup.h"
/* sdl audio backend */
#define SDL_AUDIO_DEFAULT_SAMPLES 1024
typedef struct sdl_audio_setup_t {
til_setup_t til_setup;
unsigned frames;
} sdl_audio_setup_t;
typedef struct sdl_audio_t {
til_audio_context_t til_audio_context;
SDL_AudioDeviceID dev;
} sdl_audio_t;
static int sdl_audio_init(til_setup_t *setup, til_audio_context_t **res_context);
static void sdl_audio_shutdown(til_audio_context_t *context);
static int sdl_audio_queue(til_audio_context_t *context, int16_t *frames, int n_frames);
static unsigned sdl_audio_n_queued(til_audio_context_t *context);
static void sdl_audio_drop(til_audio_context_t *context);
static void sdl_audio_pause(til_audio_context_t *context);
static void sdl_audio_unpause(til_audio_context_t *context);
static int sdl_audio_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup);
til_audio_ops_t sdl_audio_ops = {
.init = sdl_audio_init,
.shutdown = sdl_audio_shutdown,
.drop = sdl_audio_drop,
.pause = sdl_audio_pause,
.unpause = sdl_audio_unpause,
.queue = sdl_audio_queue,
.n_queued = sdl_audio_n_queued,
.setup = sdl_audio_setup,
};
static int sdl_err_to_errno(int err)
{
switch (err) {
case SDL_ENOMEM:
return ENOMEM;
case SDL_EFREAD:
case SDL_EFWRITE:
case SDL_EFSEEK:
return EIO;
case SDL_UNSUPPORTED:
return ENOTSUP;
default:
return EINVAL;
}
}
static int sdl_audio_init(til_setup_t *setup, til_audio_context_t **res_context)
{
sdl_audio_setup_t *s = (sdl_audio_setup_t *)setup;
sdl_audio_t *c;
int r;
assert(setup);
assert(res_context);
c = til_audio_context_new(&sdl_audio_ops, sizeof(sdl_audio_t), setup);
if (!c)
return -ENOMEM;
SDL_SetMainReady(); /* is it a problem (or necessary) for both sdl_fb and sdl_audio to do this? */
r = SDL_InitSubSystem(SDL_INIT_AUDIO);
if (r < 0) {
free(c);
return -sdl_err_to_errno(r);
}
{
SDL_AudioSpec aspec = {
.freq = 44100,
.format = AUDIO_S16,
.channels = 2,
.samples = s->frames,
};
c->dev = SDL_OpenAudioDevice(NULL, 0, &aspec, NULL, 0);
if (!c->dev) {
/* SDL_GetError only returns strings, we need an errno FIXME */
free(c);
return -EPERM;
}
}
*res_context = &c->til_audio_context;
return 0;
}
static void sdl_audio_shutdown(til_audio_context_t *context)
{
sdl_audio_t *c = (sdl_audio_t *)context;
SDL_CloseAudioDevice(c->dev);
}
static void sdl_audio_drop(til_audio_context_t *context)
{
sdl_audio_t *c = (sdl_audio_t *)context;
SDL_ClearQueuedAudio(c->dev);
}
static void sdl_audio_pause(til_audio_context_t *context)
{
sdl_audio_t *c = (sdl_audio_t *)context;
SDL_PauseAudioDevice(c->dev, 1);
}
static void sdl_audio_unpause(til_audio_context_t *context)
{
sdl_audio_t *c = (sdl_audio_t *)context;
SDL_PauseAudioDevice(c->dev, 0);
}
static int sdl_audio_queue(til_audio_context_t *context, int16_t *frames, int n_frames)
{
sdl_audio_t *c = (sdl_audio_t *)context;
/* TODO FIXME: SDL_audio.h says this returns a negative error code on
* error, but that's not the same as a -errno, so directly returning
* from here isn't exactly appropriate.
*/
return SDL_QueueAudio(c->dev, frames, n_frames * (sizeof(*frames) * 2));
}
static unsigned sdl_audio_n_queued(til_audio_context_t *context)
{
sdl_audio_t *c = (sdl_audio_t *)context;
return SDL_GetQueuedAudioSize(c->dev) / (sizeof(int16_t) * 2);
}
static int sdl_audio_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup)
{
til_setting_t *frames;
const char *frames_values[] = {
"512",
"1024",
"2048",
"4096",
"8192",
NULL
};
int r;
r = til_settings_get_and_describe_setting(settings,
&(til_setting_spec_t){
.name = "Audio frames buffered",
.key = "frames",
.regex = "[0-9]+",
.preferred = TIL_SETTINGS_STR(SDL_AUDIO_DEFAULT_SAMPLES),
.values = frames_values,
.annotations = NULL
},
&frames,
res_setting,
res_desc);
if (r)
return r;
if (res_setup) {
sdl_audio_setup_t *setup;
setup = til_setup_new(settings, sizeof(*setup), NULL, &sdl_audio_ops);
if (!setup)
return -ENOMEM;
if (sscanf(frames->value, "%u", &setup->frames) != 1)
return til_setup_free_with_failed_setting_ret_err(&setup->til_setup, frames, res_setting, -EINVAL);
*res_setup = &setup->til_setup;
}
return 0;
}
|
