int dumb_source_update(audio_source *src, char *buffer, int len) {
dumb_source *local = source_get_userdata(src);
// Get deltatime and bitrate
float delta = 65536.0f / source_get_frequency(src);
int bps = source_get_channels(src) * source_get_bytes(src);
// If looping is off, and if we have played the whole file, stop here.
long pos = duh_sigrenderer_get_position(local->renderer);
if(pos < local->vpos && !src->loop) {
return 0;
}
local->vpos = pos;
// ... otherwise get more data.
int ret = duh_render_int(
local->renderer,
&local->sig_samples,
&local->sig_samples_size,
source_get_bytes(src) * 8, // Bits
0, // Unsign
1.0f, // Volume
delta,
len / bps, // Size
buffer
) * bps;
return ret;
}
void openal_stream_play(audio_stream *stream) {
openal_stream *local = stream_get_userdata(stream);
// Fill initial buffers
char buf[AUDIO_BUFFER_SIZE];
for(int i = 0; i < AUDIO_BUFFER_COUNT; i++) {
int ret = source_update(stream->src, buf, AUDIO_BUFFER_SIZE);
if(ret > 0) {
alBufferData(
local->buffers[i],
local->format,
buf, ret,
source_get_frequency(stream->src));
alSourceQueueBuffers(local->source, 1, &local->buffers[i]);
}
}
// Set volume etc.
openal_stream_apply(stream);
// Start playback
alSourcePlay(local->source);
int err = alGetError();
if(err != AL_NO_ERROR) {
PERROR("OpenAL Stream: Source playback error: %d.", err);
}
}
void openal_stream_update(audio_stream *stream) {
openal_stream *local = stream_get_userdata(stream);
// See if we have any empty buffers to fill
int val;
alGetSourcei(local->source, AL_BUFFERS_PROCESSED, &val);
if(val <= 0) {
return;
}
// Handle buffer filling and loading
char buf[AUDIO_BUFFER_SIZE];
ALuint n;
while(val--) {
// Fill buffer & re-queue
int ret = source_update(stream->src, buf, AUDIO_BUFFER_SIZE);
if(ret > 0) {
alSourceUnqueueBuffers(local->source, 1, &n);
alBufferData(n, local->format, buf, ret, source_get_frequency(stream->src));
alSourceQueueBuffers(local->source, 1, &n);
// Check for any errors
int err = alGetError();
if(err != AL_NO_ERROR) {
PERROR("OpenAL Stream: Error %d while buffering!", err);
}
} else {
stream_set_finished(stream);
break;
}
}
// Make sure we are playing stream
if(stream_get_status(stream) == STREAM_STATUS_PLAYING) {
ALenum state;
alGetSourcei(local->source, AL_SOURCE_STATE, &state);
if(state != AL_PLAYING) {
alSourcePlay(local->source);
}
}
}
