66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
// audio.c
|
|
|
|
int audio_frame(Ampler_state *state) {
|
|
int queued = SDL_GetQueuedAudioSize(state -> playdev);
|
|
queued /= sizeof s16; // queued is in bytes
|
|
|
|
if queued > FRAME_SAMPLES * CHANNELS * 2 do return 0;
|
|
// else puts("queued audio.");
|
|
|
|
static s16 frame[SAMPLE_RATE * CHANNELS * 7] = { 0 };
|
|
for int i = 0; i < arraylen(frame); i += CHANNELS do {
|
|
int vol = 64;
|
|
frame[i] = ((s16) (state -> track_l[i])) * vol;
|
|
frame[i + 1] = ((s16) (state -> track_r[i])) * vol;
|
|
}
|
|
if SDL_QueueAudio(state -> playdev, frame, sizeof frame) do
|
|
puts(SDL_GetError());
|
|
|
|
return 1; // audio was qued
|
|
}
|
|
|
|
void load_track(Ampler_state *state) {
|
|
SDL_AudioSpec spec;
|
|
s16 *buffer = NULL;
|
|
u32 bytes = 0;
|
|
|
|
SDL_LoadWAV("sample.wav", &spec, &buffer, &bytes);
|
|
|
|
if spec.format != AUDIO_S16 do {
|
|
puts("error: sample.wav is not s16");
|
|
return;
|
|
}
|
|
|
|
const int len = bytes / sizeof s16;
|
|
|
|
// TODO: Use floats to print out total number of seconds
|
|
printf("loading sample.wav\n");
|
|
|
|
s8 *tracks[] = { state -> track_l, state -> track_r, };
|
|
for int i = 0; i < len; i += spec.channels do
|
|
for int c = 0; c < spec.channels; c++ do {
|
|
tracks[c][i] = (s8) (buffer[i + c] >> 8);
|
|
}
|
|
|
|
SDL_FreeWAV((void *) buffer);
|
|
}
|
|
|
|
void load_track_f32() { // idk if we're ever gonna be loading floats
|
|
/*
|
|
f32 max = 0.0f;
|
|
for int i = 0; i < len; i++ do
|
|
if buffer[i] > max do
|
|
max = buffer[i];
|
|
else if buffer[i] < -max do
|
|
max = -buffer[i];
|
|
printf("%f max\n", max);
|
|
for int i = 0; i < len; i += 2 do {
|
|
buffer[i] /= max;
|
|
buffer[i + 1] /= max;
|
|
state -> track_l[i] = ((s8)(buffer[i] * 127.0f));
|
|
state -> track_r[i] = ((s8)(buffer[i + 1] * 127.0f));
|
|
}
|
|
*/
|
|
}
|
|
|