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;
}
// This is called from SDL2, and should read data from a source and hand it over
// to SDL2 via the stream buffer.
void stream_audio(void *userdata, Uint8 *stream, int len) {
streamer_t *streamer = (streamer_t *)userdata;
// Read samples from libdumb save them to the SDL buffer. Note that we are
// reading SAMPLES, not bytes!
int r_samples = len / streamer->sbytes;
int got =
duh_render_int(streamer->renderer, &streamer->sig_samples,
&streamer->sig_samples_size, streamer->bits, 0,
streamer->volume, streamer->delta, r_samples, stream);
if (got == 0) {
streamer->ended = true;
}
// Get current position from libdumb for the playback display. If we get
// position that is 0, it probably means that the song ended and
// duh_sigrenderer_get_position points to the start of the file.
streamer->spos = duh_sigrenderer_get_position(streamer->renderer);
if (streamer->spos == 0) {
streamer->spos = streamer->ssize;
}
}
