118 lines
4.2 KiB
C
118 lines
4.2 KiB
C
/*
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Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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/* !!! FIXME: this code is not up to standards for SDL3 test apps. Someone should improve this. */
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#include <SDL3/SDL.h>
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#include <SDL3/SDL_main.h>
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#include <SDL3/SDL_test.h>
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int main(int argc, char *argv[])
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{
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SDL_Window *window;
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SDL_Renderer *renderer;
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SDL_bool done = SDL_FALSE;
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const SDL_FRect slider_area = { (640 - 500) / 2, (480 - 100) / 2, 500, 100 };
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SDL_FRect slider_fill_area = slider_area;
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int multiplier = 100;
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SDL_AudioSpec spec;
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Uint8 *audio_buf = NULL;
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Uint32 audio_len = 0;
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SDL_AudioStream *stream;
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SDL_AudioDeviceID device;
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SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO);
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window = SDL_CreateWindow("Drag the slider: Normal speed", 640, 480, 0);
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renderer = SDL_CreateRenderer(window, NULL, 0);
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SDL_LoadWAV("sample.wav", &spec, &audio_buf, &audio_len);
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stream = SDL_CreateAudioStream(&spec, &spec);
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SDL_PutAudioStreamData(stream, audio_buf, audio_len);
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device = SDL_OpenAudioDevice(SDL_AUDIO_DEVICE_DEFAULT_OUTPUT, &spec);
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SDL_BindAudioStream(device, stream);
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slider_fill_area.w /= 2;
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while (!done) {
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SDL_Event e;
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int newmultiplier = multiplier;
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while (SDL_PollEvent(&e)) {
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if (e.type == SDL_EVENT_QUIT) {
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done = 1;
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} else if (e.type == SDL_EVENT_KEY_DOWN) {
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if (e.key.keysym.sym == SDLK_ESCAPE) {
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done = 1;
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}
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} else if (e.type == SDL_EVENT_MOUSE_MOTION) {
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if (e.motion.state & SDL_BUTTON_LMASK) {
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const SDL_FPoint p = { e.motion.x, e.motion.y };
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if (SDL_PointInRectFloat(&p, &slider_area)) {
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const float w = SDL_roundf(p.x - slider_area.x);
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slider_fill_area.w = w;
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newmultiplier = ((int) ((w / slider_area.w) * 800.0f)) - 400;
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}
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}
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}
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}
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if (multiplier != newmultiplier) {
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SDL_AudioSpec newspec;
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char title[64];
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int newfreq = spec.freq;
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multiplier = newmultiplier;
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if (multiplier == 0) {
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SDL_snprintf(title, sizeof (title), "Drag the slider: Normal speed");
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} else if (multiplier < 0) {
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SDL_snprintf(title, sizeof (title), "Drag the slider: %.2fx slow", (-multiplier / 100.0f) + 1.0f);
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} else {
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SDL_snprintf(title, sizeof (title), "Drag the slider: %.2fx fast", (multiplier / 100.0f) + 1.0f);
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}
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SDL_SetWindowTitle(window, title);
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/* this math sucks, but whatever. */
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if (multiplier < 0) {
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newfreq = spec.freq + (int) ((spec.freq * (multiplier / 400.0f)) * 0.75f);
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} else if (multiplier > 0) {
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newfreq = spec.freq + (int) (spec.freq * (multiplier / 100.0f));
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}
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/* SDL_Log("newfreq=%d multiplier=%d\n", newfreq, multiplier); */
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SDL_memcpy(&newspec, &spec, sizeof (spec));
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newspec.freq = newfreq;
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SDL_SetAudioStreamFormat(stream, &newspec, NULL);
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}
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/* keep it looping. */
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if (SDL_GetAudioStreamAvailable(stream) < (audio_len / 2)) {
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SDL_PutAudioStreamData(stream, audio_buf, audio_len);
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}
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SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);
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SDL_RenderClear(renderer);
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SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
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SDL_RenderFillRect(renderer, &slider_area);
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SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
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SDL_RenderFillRect(renderer, &slider_fill_area);
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SDL_RenderPresent(renderer);
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}
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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SDL_CloseAudioDevice(device);
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SDL_DestroyAudioStream(stream);
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SDL_free(audio_buf);
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SDL_Quit();
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return 0;
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}
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