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add minimal audio for macos

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Serge Zaitsev
2023-01-18 11:56:48 +01:00
parent 6f0e5abcd9
commit 2a5bb89a50
1 changed files with 101 additions and 0 deletions
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fenster_audio.h Normal file
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#ifndef FENSTER_AUDIO_H
#define FENSTER_AUDIO_H
#ifndef FENSTER_SAMPLE_RATE
#define FENSTER_SAMPLE_RATE 44100
#endif
#ifndef FENSTER_AUDIO_BUFSZ
#define FENSTER_AUDIO_BUFSZ 4096
#endif
#if defined(__APPLE__)
#include <AudioToolbox/AudioQueue.h>
struct fenster_audio {
AudioQueueRef queue;
size_t pos;
float buf[FENSTER_AUDIO_BUFSZ];
dispatch_semaphore_t drained;
dispatch_semaphore_t full;
};
#elif defined(_WIN32)
struct fenster_audio {};
#elif defined(__linux__)
struct fenster_audio {};
#endif
#ifndef FENSTER_API
#define FENSTER_API extern
#endif
FENSTER_API int fenster_audio_open(struct fenster_audio *f);
FENSTER_API int fenster_audio_available(struct fenster_audio *f);
FENSTER_API void fenster_audio_write(struct fenster_audio *f, float *buf,
size_t n);
FENSTER_API void fenster_audio_close(struct fenster_audio *f);
#ifndef FENSTER_HEADER
#if defined(__APPLE__)
static void fenster_audio_cb(void *p, AudioQueueRef q, AudioQueueBufferRef b) {
struct fenster_audio *fa = (struct fenster_audio *)p;
dispatch_semaphore_wait(fa->full, DISPATCH_TIME_FOREVER);
memmove(b->mAudioData, fa->buf, sizeof(fa->buf));
dispatch_semaphore_signal(fa->drained);
AudioQueueEnqueueBuffer(q, b, 0, NULL);
}
FENSTER_API int fenster_audio_open(struct fenster_audio *fa) {
AudioStreamBasicDescription format = {0};
format.mSampleRate = FENSTER_SAMPLE_RATE;
format.mFormatID = kAudioFormatLinearPCM;
format.mFormatFlags = kLinearPCMFormatFlagIsFloat | kAudioFormatFlagIsPacked;
format.mBitsPerChannel = 32;
format.mFramesPerPacket = format.mChannelsPerFrame = 1;
format.mBytesPerPacket = format.mBytesPerFrame = 4;
fa->drained = dispatch_semaphore_create(1);
fa->full = dispatch_semaphore_create(0);
AudioQueueNewOutput(&format, fenster_audio_cb, fa, NULL, NULL, 0, &fa->queue);
for (int i = 0; i < 2; i++) {
AudioQueueBufferRef buffer = NULL;
AudioQueueAllocateBuffer(fa->queue, FENSTER_AUDIO_BUFSZ * 4, &buffer);
buffer->mAudioDataByteSize = FENSTER_AUDIO_BUFSZ * 4;
memset(buffer->mAudioData, 0, buffer->mAudioDataByteSize);
AudioQueueEnqueueBuffer(fa->queue, buffer, 0, NULL);
}
AudioQueueStart(fa->queue, NULL);
}
FENSTER_API void fenster_audio_close(struct fenster_audio *fa) {
AudioQueueStop(fa->queue, false);
AudioQueueDispose(fa->queue, false);
}
FENSTER_API int fenster_audio_available(struct fenster_audio *fa) {
if (dispatch_semaphore_wait(fa->drained, DISPATCH_TIME_NOW))
return 0;
return FENSTER_AUDIO_BUFSZ - fa->pos;
}
FENSTER_API void fenster_audio_write(struct fenster_audio *fa, float *buf,
size_t n) {
while (fa->pos < FENSTER_AUDIO_BUFSZ && n > 0) {
fa->buf[fa->pos++] = *buf++, n--;
}
if (fa->pos >= FENSTER_AUDIO_BUFSZ) {
fa->pos = 0;
dispatch_semaphore_signal(fa->full);
}
}
#elif defined(_WIN32)
/* TODO */
FENSTER_API int fenster_audio_open(struct fenster_audio *f) { return -1; }
FENSTER_API int fenster_audio_available(struct fenster_audio *f) { return -1; }
FENSTER_API void fenster_audio_write(struct fenster_audio *f, float *buf,
size_t n) {}
FENSTER_API void fenster_audio_close(struct fenster_audio *f) {}
#elif defined(__linux__)
#else
FENSTER_API int fenster_audio_open(struct fenster_audio *f) { return -1; }
FENSTER_API int fenster_audio_available(struct fenster_audio *f) { return -1; }
FENSTER_API void fenster_audio_write(struct fenster_audio *f, float *buf,
size_t n) {}
FENSTER_API void fenster_audio_close(struct fenster_audio *f) {}
#endif
#endif /* FENSTER_HEADER */
#endif /* FENSTER_AUDIO_H */