|
|
@@ -0,0 +1,104 @@
|
|
|
+/*
|
|
|
+ * This example code creates an simple audio stream for playing sound, and
|
|
|
+ * loads a .wav file that is pushed through the stream in a loop.
|
|
|
+ *
|
|
|
+ * This code is public domain. Feel free to use it for any purpose!
|
|
|
+ *
|
|
|
+ * The .wav file is a sample from Will Provost's song, The Living Proof,
|
|
|
+ * used with permission.
|
|
|
+ *
|
|
|
+ * From the album The Living Proof
|
|
|
+ * Publisher: 5 Guys Named Will
|
|
|
+ * Copyright 1996 Will Provost
|
|
|
+ * https://itunes.apple.com/us/album/the-living-proof/id4153978
|
|
|
+ * http://www.amazon.com/The-Living-Proof-Will-Provost/dp/B00004R8RH
|
|
|
+ */
|
|
|
+
|
|
|
+#define SDL_MAIN_USE_CALLBACKS 1 /* use the callbacks instead of main() */
|
|
|
+#include <SDL3/SDL.h>
|
|
|
+#include <SDL3/SDL_main.h>
|
|
|
+
|
|
|
+/* We will use this renderer to draw into this window every frame. */
|
|
|
+static SDL_Window *window = NULL;
|
|
|
+static SDL_Renderer *renderer = NULL;
|
|
|
+static SDL_AudioStream *stream = NULL;
|
|
|
+static Uint8 *wav_data = NULL;
|
|
|
+static Uint32 wav_data_len = 0;
|
|
|
+
|
|
|
+/* This function runs once at startup. */
|
|
|
+int SDL_AppInit(void **appstate, int argc, char *argv[])
|
|
|
+{
|
|
|
+ SDL_AudioSpec spec;
|
|
|
+ char *wav_path = NULL;
|
|
|
+
|
|
|
+ if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) == -1) {
|
|
|
+ SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't initialize SDL!", SDL_GetError(), NULL);
|
|
|
+ return SDL_APP_FAILURE;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* we don't _need_ a window for audio-only things but it's good policy to have one. */
|
|
|
+ if (SDL_CreateWindowAndRenderer("examples/audio/load-wav", 640, 480, 0, &window, &renderer) == -1) {
|
|
|
+ SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't create window/renderer!", SDL_GetError(), NULL);
|
|
|
+ return SDL_APP_FAILURE;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Load the .wav file from wherever the app is being run from. */
|
|
|
+ SDL_asprintf(&wav_path, "%ssample.wav", SDL_GetBasePath()); /* allocate a string of the full file path */
|
|
|
+ if (SDL_LoadWAV(wav_path, &spec, &wav_data, &wav_data_len) == -1) {
|
|
|
+ SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't load .wav file!", SDL_GetError(), NULL);
|
|
|
+ return SDL_APP_FAILURE;
|
|
|
+ }
|
|
|
+
|
|
|
+ SDL_free(wav_path); /* done with this string. */
|
|
|
+
|
|
|
+ /* Create our audio stream in the same format as the .wav file. It'll convert to what the audio hardware wants. */
|
|
|
+ stream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &spec, NULL, NULL);
|
|
|
+ if (!stream) {
|
|
|
+ SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't create audio stream!", SDL_GetError(), window);
|
|
|
+ return SDL_APP_FAILURE;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* SDL_OpenAudioDeviceStream starts the device paused. You have to tell it to start! */
|
|
|
+ SDL_ResumeAudioStreamDevice(stream);
|
|
|
+
|
|
|
+ /* (this is a web browser requirement, not an SDL thing.) */
|
|
|
+ SDL_Log("If you're running this in a web browser, you need to click the window before you'll hear anything.");
|
|
|
+
|
|
|
+ return SDL_APP_CONTINUE; /* carry on with the program! */
|
|
|
+}
|
|
|
+
|
|
|
+/* This function runs when a new event (mouse input, keypresses, etc) occurs. */
|
|
|
+int SDL_AppEvent(void *appstate, const SDL_Event *event)
|
|
|
+{
|
|
|
+ if (event->type == SDL_EVENT_QUIT) {
|
|
|
+ return SDL_APP_SUCCESS; /* end the program, reporting success to the OS. */
|
|
|
+ }
|
|
|
+ return SDL_APP_CONTINUE; /* carry on with the program! */
|
|
|
+}
|
|
|
+
|
|
|
+/* This function runs once per frame, and is the heart of the program. */
|
|
|
+int SDL_AppIterate(void *appstate)
|
|
|
+{
|
|
|
+ /* see if we need to feed the audio stream more data yet.
|
|
|
+ We're being lazy here, but if there's less than the entire wav file left to play,
|
|
|
+ just shove a whole copy of it into the queue, so we always have _tons_ of
|
|
|
+ data queued for playback. */
|
|
|
+ if (SDL_GetAudioStreamAvailable(stream) < wav_data_len) {
|
|
|
+ /* feed more data to the stream. It will queue at the end, and trickle out as the hardware needs more data. */
|
|
|
+ SDL_PutAudioStreamData(stream, wav_data, wav_data_len);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* we're not doing anything with the renderer, so just blank it out. */
|
|
|
+ SDL_RenderClear(renderer);
|
|
|
+ SDL_RenderPresent(renderer);
|
|
|
+
|
|
|
+ return SDL_APP_CONTINUE; /* carry on with the program! */
|
|
|
+}
|
|
|
+
|
|
|
+/* This function runs once at shutdown. */
|
|
|
+void SDL_AppQuit(void *appstate)
|
|
|
+{
|
|
|
+ SDL_free(wav_data); /* strictly speaking, this isn't necessary because the process is ending, but it's good policy. */
|
|
|
+ /* SDL will clean up the window/renderer for us. */
|
|
|
+}
|
|
|
+
|
Ryan C. Gordon