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naclaudio: Untested attempt to migrate to SDL_AudioStream.

This commit is contained in:
Ryan C. Gordon 2017-01-06 00:56:29 -05:00
parent 115d0ce71c
commit 99fc1ef994
1 changed files with 34 additions and 17 deletions
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51
src/audio/nacl/SDL_naclaudio.c
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@ -45,29 +45,46 @@
static void nacl_audio_callback(void* samples, uint32_t buffer_size, PP_TimeDelta latency, void* data); static void nacl_audio_callback(void* samples, uint32_t buffer_size, PP_TimeDelta latency, void* data);
/* FIXME: Make use of latency if needed */ /* FIXME: Make use of latency if needed */
static void nacl_audio_callback(void* samples, uint32_t buffer_size, PP_TimeDelta latency, void* data) { static void nacl_audio_callback(void* stream, uint32_t buffer_size, PP_TimeDelta latency, void* data) {
const int len = (int) buffer_size;
SDL_AudioDevice* _this = (SDL_AudioDevice*) data; SDL_AudioDevice* _this = (SDL_AudioDevice*) data;
SDL_AudioCallback callback = _this->spec.callback;
SDL_LockMutex(private->mutex); /* !!! FIXME: is this mutex necessary? */ SDL_LockMutex(private->mutex); /* !!! FIXME: is this mutex necessary? */
if (SDL_AtomicGet(&_this->enabled) && !SDL_AtomicGet(&_this->paused)) { /* Only do something if audio is enabled */
if (_this->convert.needed) { if (!SDL_AtomicGet(&_this->enabled) || SDL_AtomicGet(&_this->paused)) {
SDL_LockMutex(_this->mixer_lock); if (_this->stream) {
(*_this->spec.callback) (_this->spec.userdata, SDL_AudioStreamClear(_this->stream);
(Uint8 *) _this->convert.buf,
_this->convert.len);
SDL_UnlockMutex(_this->mixer_lock);
SDL_ConvertAudio(&_this->convert);
SDL_memcpy(samples, _this->convert.buf, _this->convert.len_cvt);
} else {
SDL_LockMutex(_this->mixer_lock);
(*_this->spec.callback) (_this->spec.userdata, (Uint8 *) samples, buffer_size);
SDL_UnlockMutex(_this->mixer_lock);
} }
} else { SDL_memset(stream, _this->spec.silence, len);
SDL_memset(samples, _this->spec.silence, buffer_size); return;
} }
SDL_assert(_this->spec.size == len);
if (_this->stream == NULL) { /* no conversion necessary. */
SDL_LockMutex(_this->mixer_lock);
callback(_this->spec.userdata, stream, len);
SDL_UnlockMutex(_this->mixer_lock);
} else { /* streaming/converting */
const int stream_len = _this->callbackspec.size;
while (SDL_AudioStreamAvailable(_this->stream) < len) {
callback(_this->spec.userdata, _this->fake_stream, stream_len);
if (SDL_AudioStreamPut(_this->stream, _this->fake_stream, stream_len) == -1) {
SDL_AudioStreamClear(_this->stream);
SDL_AtomicSet(&_this->enabled, 0);
break;
}
}
const int got = SDL_AudioStreamGet(_this->stream, len, stream, len);
SDL_assert((got < 0) || (got == len));
if (got != len) {
SDL_memset(stream, _this->spec.silence, len);
}
}
SDL_UnlockMutex(private->mutex); SDL_UnlockMutex(private->mutex);
} }