audio finally loads and plays
parent
cffa8ca132
commit
412d2588cb
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@ -2,3 +2,4 @@
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*.exe
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*.dll
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reload-trigger
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*.wav
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55
ampler.c
55
ampler.c
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@ -6,39 +6,10 @@
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#include <SDL2/SDL.h>
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#define SAMPLE_RATE (44100)
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#define CHANNELS (2)
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#define FRAME_SAMPLES (SAMPLE_RATE / 60)
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#include "ampler.h"
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typedef uint8_t s8;
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typedef uint16_t s16;
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typedef struct Ampler_state Ampler_state;
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struct Ampler_state {
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int size;
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SDL_AudioDeviceID playdev;
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s8 track_l[SAMPLE_RATE * 120]; // 2 minutes
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s8 track_r[SAMPLE_RATE * 120]; // 2 minutes
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};
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int audio_frame(Ampler_state *state) {
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int queued = SDL_GetQueuedAudioSize(state -> playdev);
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queued /= sizeof s16; // queued is in bytes
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if(queued > FRAME_SAMPLES * CHANNELS * 2) return 0;
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// else puts("queued audio.");
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s16 silence[FRAME_SAMPLES * CHANNELS] = { 0 };
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for (int i = 0; i < FRAME_SAMPLES; i += CHANNELS) {
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int vol = 10;
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silence[i] = (i/2) * vol - FRAME_SAMPLES / 2;
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silence[i + 1] = (i/2) * vol - FRAME_SAMPLES / 2;
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}
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if(SDL_QueueAudio(state -> playdev, silence, sizeof silence))
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puts(SDL_GetError());
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return 1; // audio was qued
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}
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#include "audio.c"
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#include "draw.c"
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Ampler_state *init() {
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Ampler_state *state = malloc(sizeof Ampler_state);
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@ -61,7 +32,7 @@ Ampler_state *init() {
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&have,
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0 // no changes allowed
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);
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if(!(state -> playdev))
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if !(state -> playdev) do
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puts(SDL_GetError());
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puts("init.");
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@ -69,10 +40,10 @@ Ampler_state *init() {
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}
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int ampler_main(SDL_Window *w, SDL_Renderer *r, Ampler_state **u_data) {
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if(*u_data == NULL) *u_data = init();
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if *u_data == NULL do *u_data = init();
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int old_size = (*u_data) -> size, new_size = sizeof Ampler_state;
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if(old_size < new_size) {
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u32 old_size = (*u_data) -> size, new_size = sizeof Ampler_state;
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if old_size < new_size do {
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printf("increasing size. %i to %i\n", old_size, new_size);
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Ampler_state *nu = malloc(new_size);
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SDL_memset(nu, 0, new_size);
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@ -84,20 +55,22 @@ int ampler_main(SDL_Window *w, SDL_Renderer *r, Ampler_state **u_data) {
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Ampler_state *state = *u_data;
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load_track(state);
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SDL_PauseAudioDevice(state -> playdev, 0); // unpause audio
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while (1) {
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while 1 do {
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SDL_Event e;
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while(SDL_PollEvent(&e))
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if (e.type == SDL_QUIT)
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while SDL_PollEvent(&e) do
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if e.type == SDL_QUIT do
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return 1;
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audio_frame(state);
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// draw_frame(w, r, state);
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draw_frame(w, r, state);
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SDL_RenderPresent(r);
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SDL_Delay(1);
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if (!remove("reload-trigger")) {
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if !remove("reload-trigger") do {
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SDL_PauseAudioDevice(state -> playdev, 1); // pause audio
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puts("removed reload-trigger, reloading...");
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return 0;
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@ -0,0 +1,35 @@
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// ampler.h
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#define if if(
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#define while while(
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#define for for(
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#define do )
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typedef int8_t s8;
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typedef int16_t s16;
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typedef int32_t s32;
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typedef uint8_t u8;
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typedef uint16_t u16;
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typedef uint32_t u32;
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typedef float f32;
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typedef double f64;
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#define arraylen(a) (sizeof (a) / sizeof ((a)[0]))
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#define SAMPLE_RATE (44100)
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#define CHANNELS (2)
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#define FRAME_SAMPLES (SAMPLE_RATE / 60)
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typedef struct Ampler_state Ampler_state;
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struct Ampler_state {
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u32 size;
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SDL_AudioDeviceID playdev;
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s8 track_l[SAMPLE_RATE * 120]; // 2 minutes
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s8 track_r[SAMPLE_RATE * 120]; // 2 minutes
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};
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58
audio.c
58
audio.c
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@ -4,18 +4,62 @@ int audio_frame(Ampler_state *state) {
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int queued = SDL_GetQueuedAudioSize(state -> playdev);
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queued /= sizeof s16; // queued is in bytes
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if(queued > FRAME_SAMPLES * CHANNELS * 2) return 0;
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if queued > FRAME_SAMPLES * CHANNELS * 2 do return 0;
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// else puts("queued audio.");
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s16 silence[FRAME_SAMPLES * CHANNELS] = { 0 };
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for (int i = 0; i < FRAME_SAMPLES; i += CHANNELS) {
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int vol = 10;
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silence[i] = (i/2) * vol - FRAME_SAMPLES / 2;
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silence[i + 1] = (i/2) * vol - FRAME_SAMPLES / 2;
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static s16 frame[SAMPLE_RATE * CHANNELS * 7] = { 0 };
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for int i = 0; i < arraylen(frame); i += CHANNELS do {
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int vol = 64;
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frame[i] = ((s16) (state -> track_l[i])) * vol;
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frame[i + 1] = ((s16) (state -> track_r[i])) * vol;
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}
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if(SDL_QueueAudio(state -> playdev, silence, sizeof silence))
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if SDL_QueueAudio(state -> playdev, frame, sizeof frame) do
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puts(SDL_GetError());
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return 1; // audio was qued
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}
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void load_track(Ampler_state *state) {
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SDL_AudioSpec spec;
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s16 *buffer = NULL;
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u32 bytes = 0;
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SDL_LoadWAV("sample.wav", &spec, &buffer, &bytes);
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if spec.format != AUDIO_S16 do {
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puts("error: sample.wav is not s16");
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return;
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}
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const int len = bytes / sizeof s16;
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// TODO: Use floats to print out total number of seconds
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printf("loading sample.wav\n");
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s8 *tracks[] = { state -> track_l, state -> track_r, };
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for int i = 0; i < len; i += spec.channels do
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for int c = 0; c < spec.channels; c++ do {
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tracks[c][i] = (s8) (buffer[i + c] >> 8);
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}
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SDL_FreeWAV((void *) buffer);
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}
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void load_track_f32() { // idk if we're ever gonna be loading floats
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/*
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f32 max = 0.0f;
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for int i = 0; i < len; i++ do
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if buffer[i] > max do
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max = buffer[i];
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else if buffer[i] < -max do
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max = -buffer[i];
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printf("%f max\n", max);
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for int i = 0; i < len; i += 2 do {
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buffer[i] /= max;
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buffer[i + 1] /= max;
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state -> track_l[i] = ((s8)(buffer[i] * 127.0f));
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state -> track_r[i] = ((s8)(buffer[i + 1] * 127.0f));
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}
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*/
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}
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2
core.c
2
core.c
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@ -21,7 +21,7 @@ int main(int argc, char **argv) {
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w = SDL_CreateWindow("core",
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SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
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480, 480, SDL_WINDOW_RESIZABLE);
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512, 512, SDL_WINDOW_RESIZABLE);
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r = SDL_CreateRenderer(w, -1,
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SDL_RENDERER_ACCELERATED | SDL_RENDERER_TARGETTEXTURE);
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