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#define SDL_MAIN_HANDLED
#include <SDL2/SDL.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include "include.h"
int module_openmpt(struct blob *file, struct userdata *userdata);
#define eprintf(...) fprintf(stderr, __VA_ARGS__)
static const int WINDOW_WIDTH = 160, WINDOW_HEIGHT = 90;
SDL_Window *window = NULL;
struct blob load_file(char const *const name);
struct userdata userdata = {
.callback = NULL,
.user = NULL,
};
void audio_callback(void *userdata_void, unsigned char *stream_void, int const length) {
struct userdata *user = userdata_void;
float *stream = (float *) stream_void;
if (user->callback == NULL) {
for (int i = 0; i < length / sizeof (float); i++) {
stream[i] = 0.0;
}
} else {
user->callback(user->user, stream_void, length);
}
}
int main(void) {
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO)) {
eprintf("failed to init SDL: %s\n");
return EXIT_FAILURE;
}
SDL_StopTextInput();
if ((window = SDL_CreateWindow("mu-sdl", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIDDEN)) == NULL) {
eprintf("failed to create a window: %s\n");
SDL_Quit();
return EXIT_FAILURE;
}
SDL_Renderer *renderer;
if ((renderer = SDL_CreateRenderer(window, -1, 0)) == NULL) {
eprintf("failed to create a renderer: %s\n");
SDL_DestroyWindow(window);
SDL_Quit();
return EXIT_FAILURE;
}
SDL_ShowWindow(window);
SDL_SetRenderDrawColor(renderer, 0, 0, 0, SDL_ALPHA_OPAQUE);
SDL_RenderClear(renderer);
SDL_RenderPresent(renderer);
SDL_AudioSpec desired = {
.freq = 48000,
.format = AUDIO_F32SYS,
.channels = 2,
.samples = 8096,
.callback = audio_callback,
.userdata = &userdata,
};
SDL_AudioDeviceID audio = SDL_OpenAudioDevice(NULL, 0, &desired, NULL, 0);
SDL_PauseAudioDevice(audio, 0);
while (true) {
SDL_Event evt;
while (SDL_PollEvent(&evt)) {
switch (evt.type) {
case SDL_QUIT:
goto done;
case SDL_WINDOWEVENT:
SDL_RenderClear(renderer);
SDL_RenderPresent(renderer);
break;
case SDL_KEYDOWN:
// ^Q
if (evt.key.keysym.sym == SDLK_q && evt.key.keysym.mod & KMOD_CTRL) {
goto done;
}
// ESC
if (evt.key.keysym.sym == SDLK_ESCAPE) {
goto done;
}
break;
case SDL_DROPFILE:
puts(evt.drop.file);
struct blob file = load_file(evt.drop.file);
if (file.data == NULL) {
perror(evt.drop.file);
SDL_free(evt.drop.file);
break;
}
SDL_free(evt.drop.file);
struct userdata newuser = {.callback = NULL, .freefunc = NULL};
if (module_openmpt(&file, audio, &newuser)) {
// error
} else {
SDL_LockAudioDevice(audio);
if (userdata.freefunc != NULL) {
userdata.freefunc(userdata.user);
}
userdata = newuser;
SDL_UnlockAudioDevice(audio);
}
free(file.data);
break;
default:
}
}
}
done:
if (userdata.freefunc != NULL) {
SDL_LockAudioDevice(audio);
userdata.freefunc(userdata.user);
SDL_UnlockAudioDevice(audio);
}
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_CloseAudioDevice(audio);
SDL_Quit();
return EXIT_SUCCESS;
}
struct blob load_file(char const *const name) {
const size_t START_SIZE = 1;
FILE *file = fopen(name, "rb");
if (file == NULL) {
return (struct blob) {.data = NULL};
}
void *data = malloc(START_SIZE);
size_t allocated = START_SIZE;
size_t used = 0;
while (1) {
size_t read = fread(data + used, 1, allocated - used, file);
if (read != allocated - used) {
used += read;
break;
}
used += read;
allocated *= 2;
void *const newdata = realloc(data, allocated);
if (newdata == NULL) {
goto realloc_error;
}
data = newdata;
}
void *const newdata = realloc(data, used);
if (newdata == NULL && used != 0) {
goto realloc_error;
}
fclose(file);
return (struct blob) {.data = newdata, .size = used};
realloc_error:
free(data);
fclose(file);
return (struct blob) {.data = NULL};
}
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