testmultiaudio.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
/*
Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely.
*/
#include "SDL.h"
#include <stdio.h> /* for fflush() and stdout */
16
17
18
19
#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif
20
21
22
23
24
25
26
27
28
29
30
static SDL_AudioSpec spec;
static Uint8 *sound = NULL; /* Pointer to wave data */
static Uint32 soundlen = 0; /* Length of wave data */
typedef struct
{
SDL_AudioDeviceID dev;
int soundpos;
volatile int done;
} callback_data;
31
32
callback_data cbd[64];
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
void SDLCALL
play_through_once(void *arg, Uint8 * stream, int len)
{
callback_data *cbd = (callback_data *) arg;
Uint8 *waveptr = sound + cbd->soundpos;
int waveleft = soundlen - cbd->soundpos;
int cpy = len;
if (cpy > waveleft)
cpy = waveleft;
SDL_memcpy(stream, waveptr, cpy);
len -= cpy;
cbd->soundpos += cpy;
if (len > 0) {
stream += cpy;
SDL_memset(stream, spec.silence, len);
cbd->done++;
}
}
53
54
55
56
void
loop()
{
if(cbd[0].done) {
57
#ifdef __EMSCRIPTEN__
58
emscripten_cancel_main_loop();
60
61
62
63
64
65
66
SDL_PauseAudioDevice(cbd[0].dev, 1);
SDL_CloseAudioDevice(cbd[0].dev);
SDL_FreeWAV(sound);
SDL_Quit();
}
}
67
68
69
70
71
72
73
74
75
static void
test_multi_audio(int devcount)
{
int keep_going = 1;
int i;
#ifdef __ANDROID__
SDL_Event event;
76
/* Create a Window to get fully initialized event processing for testing pause on Android. */
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
SDL_CreateWindow("testmultiaudio", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 320, 240, 0);
#endif
if (devcount > 64) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Too many devices (%d), clamping to 64...\n",
devcount);
devcount = 64;
}
spec.callback = play_through_once;
for (i = 0; i < devcount; i++) {
const char *devname = SDL_GetAudioDeviceName(i, 0);
SDL_Log("playing on device #%d: ('%s')...", i, devname);
fflush(stdout);
SDL_memset(&cbd[0], '\0', sizeof(callback_data));
spec.userdata = &cbd[0];
cbd[0].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL, 0);
if (cbd[0].dev == 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Open device failed: %s\n", SDL_GetError());
} else {
SDL_PauseAudioDevice(cbd[0].dev, 0);
100
101
102
103
104
105
#ifdef __EMSCRIPTEN__
emscripten_set_main_loop(loop, 0, 1);
#else
while (!cbd[0].done)
{
#ifdef __ANDROID__
106
/* Empty queue, some application events would prevent pause. */
107
while (SDL_PollEvent(&event)){}
108
#endif
109
110
111
SDL_Delay(100);
}
SDL_PauseAudioDevice(cbd[0].dev, 1);
112
#endif
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
SDL_Log("done.\n");
SDL_CloseAudioDevice(cbd[0].dev);
}
}
SDL_memset(cbd, '\0', sizeof(cbd));
SDL_Log("playing on all devices...\n");
for (i = 0; i < devcount; i++) {
const char *devname = SDL_GetAudioDeviceName(i, 0);
spec.userdata = &cbd[i];
cbd[i].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL, 0);
if (cbd[i].dev == 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Open device %d failed: %s\n", i, SDL_GetError());
}
}
for (i = 0; i < devcount; i++) {
if (cbd[i].dev) {
SDL_PauseAudioDevice(cbd[i].dev, 0);
}
}
while (keep_going) {
keep_going = 0;
for (i = 0; i < devcount; i++) {
if ((cbd[i].dev) && (!cbd[i].done)) {
keep_going = 1;
}
}
143
#ifdef __ANDROID__
144
/* Empty queue, some application events would prevent pause. */
145
while (SDL_PollEvent(&event)){}
146
#endif
148
SDL_Delay(100);
150
151
152
153
154
155
156
157
158
159
160
#ifndef __EMSCRIPTEN__
for (i = 0; i < devcount; i++) {
if (cbd[i].dev) {
SDL_PauseAudioDevice(cbd[i].dev, 1);
SDL_CloseAudioDevice(cbd[i].dev);
}
}
SDL_Log("All done!\n");
#endif
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
}
int
main(int argc, char **argv)
{
int devcount = 0;
/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
/* Load the SDL library */
if (SDL_Init(SDL_INIT_AUDIO) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
return (1);
}
SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());
devcount = SDL_GetNumAudioDevices(0);
if (devcount < 1) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Don't see any specific audio devices!\n");
} else {
if (argv[1] == NULL) {
argv[1] = "sample.wav";
}
/* Load the wave file into memory */
if (SDL_LoadWAV(argv[1], &spec, &sound, &soundlen) == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s\n", argv[1],
SDL_GetError());
} else {
test_multi_audio(devcount);
SDL_FreeWAV(sound);
}
}
SDL_Quit();
return 0;
}