SDL3 Example: audio/05-planar-data

This example code draws two clickable buttons. Each causes a sound to play, fed to either the left or right audio channel through separate (planar) arrays.

Planar audio can feed both channels at the same time from different arrays, as well, but this example only uses one channel at a time for clarity. A NULL array will supply silence for that channel.

/* planar-data.c ... */ /* * This example code draws two clickable buttons. Each causes a sound to play, * fed to either the left or right audio channel through separate ("planar") * arrays. * * This code is public domain. Feel free to use it for any purpose! */ #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; /* location of buttons on the screen. */ static const SDL_FRect rect_left_button = { 100, 170, 100, 100 }; static const SDL_FRect rect_right_button = { 440, 170, 100, 100 }; /* -1 if we're currently playing left, 1 if playing right, 0 if not playing. */ static int playing_sound = 0; /* Raw audio data. These arrays are at the end of the source file. */ static const Uint8 left[1870]; static const Uint8 right[1777]; /* This function runs once at startup. */ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[]) { const SDL_AudioSpec spec = { SDL_AUDIO_U8, 2, 4000 }; /* Uint8 data, stereo, 4000Hz. */ SDL_SetAppMetadata("Example Audio Planar Data", "1.0", "com.example.audio-planar-data"); if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO)) { SDL_Log("Couldn't initialize SDL: %s", SDL_GetError()); return SDL_APP_FAILURE; } if (!SDL_CreateWindowAndRenderer("examples/audio/planar-data", 640, 480, 0, &window, &renderer)) { SDL_Log("Couldn't create window/renderer: %s", SDL_GetError()); return SDL_APP_FAILURE; } stream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &spec, NULL, NULL); if (!stream) { SDL_Log("Couldn't open audio device stream: %s", SDL_GetError()); return SDL_APP_FAILURE; } SDL_ResumeAudioStreamDevice(stream); /* SDL_OpenAudioDeviceStream starts the device paused. Resume it! */ return SDL_APP_CONTINUE; /* carry on with the program! */ } /* This function runs when a new event (mouse input, keypresses, etc) occurs. */ SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event) { if (event->type == SDL_EVENT_QUIT) { return SDL_APP_SUCCESS; /* end the program, reporting success to the OS. */ } else if (event->type == SDL_EVENT_MOUSE_BUTTON_DOWN) { if (playing_sound == 0) { /* nothing currently playing? */ const SDL_FPoint point = { event->button.x, event->button.y }; if (SDL_PointInRectFloat(&point, &rect_left_button)) { /* clicked left button? */ const Uint8 *planes[] = { left, NULL }; /* specify NULL to say "this specific channel is silent" */ SDL_PutAudioStreamPlanarData(stream, (const void * const *) planes, SDL_arraysize(left)); SDL_FlushAudioStream(stream); /* that's all we're playing until it completes. */ playing_sound = -1; /* left is playing */ } else if (SDL_PointInRectFloat(&point, &rect_right_button)) { /* clicked right button? */ const Uint8 *planes[] = { NULL, right }; /* specify NULL to say "this specific channel is silent" */ SDL_PutAudioStreamPlanarData(stream, (const void * const *) planes, SDL_arraysize(right)); SDL_FlushAudioStream(stream); /* that's all we're playing until it completes. */ playing_sound = 1; /* right is playing */ } } } return SDL_APP_CONTINUE; /* carry on with the program! */ } static void render_button(const SDL_FRect *rect, const char *str, int button_value) { float x, y; if (playing_sound == button_value) { SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255); /* green while playing */ } else { SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255); /* blue while not playing */ } SDL_RenderFillRect(renderer, rect); SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255); x = rect->x + ((rect->w - (SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE * SDL_strlen(str))) / 2.0f); y = rect->y + ((rect->h - SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE) / 2.0f); SDL_RenderDebugText(renderer, x, y, str); } /* This function runs once per frame, and is the heart of the program. */ SDL_AppResult SDL_AppIterate(void *appstate) { if (playing_sound) { if (SDL_GetAudioStreamQueued(stream) == 0) { /* sound is done? We can play a new sound now. */ playing_sound = 0; } } SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255); SDL_RenderClear(renderer); render_button(&rect_left_button, "LEFT", -1); render_button(&rect_right_button, "RIGHT", 1); SDL_RenderPresent(renderer); return SDL_APP_CONTINUE; /* carry on with the program! */ } /* This function runs once at shutdown. */ void SDL_AppQuit(void *appstate, SDL_AppResult result) { SDL_DestroyAudioStream(stream); /* SDL will clean up the window/renderer for us. */ } /* This is the audio data, as raw PCM samples (Uint8, 1 channel, 4000Hz) packed into C byte arrays for convenience. */ static const Uint8 left[1870] = { 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x80, 0x80, 0x81, 0x80, 0x81, 0x82, 0x82, 0x83, 0x83, 0x83, 0x83, 0x83, 0x82, 0x82, 0x81, 0x80, 0x80, 0x80, 0x7f, 0x7e, 0x7e, 0x7e, 0x7d, 0x7b, 0x7b, 0x7b, 0x7b, 0x7c, 0x7d, 0x7d, 0x7e, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x85, 0x84, 0x84, 0x83, 0x81, 0x7f, 0x7d, 0x7c, 0x7a, 0x7a, 0x7a, 0x77, 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0x81, 0x81, 0x81, 0x84, 0x83, 0x7f, 0x7f, 0x80, 0x80, 0x7f, 0x81, 0x7e, 0x7e, 0x7f, 0x81, 0x7f, 0x7f, 0x80, 0x7f, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x7f, 0x81, 0x82, 0x82, 0x80, 0x7f, 0x80, 0x7f, 0x7f, 0x7e, 0x7e, 0x7e, 0x7e, 0x7f, 0x7e, 0x7f, 0x7f, 0x7f, 0x7d, 0x7e, 0x7e, 0x7f, 0x80, 0x80, 0x80, 0x80, 0x81, 0x80, 0x80, 0x80, 0x80, 0x80, 0x81, 0x81, 0x80, 0x80, 0x81, 0x7f, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x7f, 0x80, 0x7f, 0x7e, 0x7e, 0x7f, 0x7f, 0x7e, 0x7e, 0x7e, 0x7f, 0x7e, 0x7d, 0x7d, 0x7e, 0x7e, 0x7e, 0x7e, 0x7e, 0x7e, 0x7e, 0x7f, 0x7e, 0x80, 0x7e, 0x7f, 0x7f, 0x7e, 0x7f, 0x7e, 0x80, 0x7f, 0x80, 0x7f, 0x7f, 0x7f, 0x7f, 0x80, 0x7f, 0x7f, 0x7e, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x80, 0x7f, 0x7f, 0x7f, 0x81, 0x80, 0x7f, 0x80, 0x80, 0x82, 0x81, 0x80, 0x80, 0x80, 0x80, 0x7f, 0x7f, 0x7f, 0x7f, 0x81, 0x81, 0x80, 0x81, 0x80, 0x82, 0x7f, 0x7f, 0x7e, 0x7e, 0x80, 0x7e, 0x80, 0x7f, 0x7f, 0x7f, 0x7f, 0x80, 0x7f, 0x80, 0x7f, 0x81, 0x80, 0x81, 0x80, 0x80, 0x81, 0x80, 0x83, 0x80, 0x80, 0x7f, 0x7f, 0x80, 0x7f, 0x80, 0x7e, 0x80, 0x7f, 0x7f, 0x80, 0x7f, 0x82, 0x80, 0x81, 0x7f, 0x7e, 0x80, 0x7f, 0x80, 0x7f, 0x7f, 0x7f, 0x7f, 0x80, 0x7f, 0x7f, 0x7f, 0x80, 0x7f, 0x7f, 0x80, 0x7f, 0x81, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x7f, 0x7f, 0x80, 0x81, 0x80, 0x80, 0x80, 0x81, 0x81, 0x7f, 0x7f, 0x7f, 0x7f, 0x7e, 0x7e, 0x7f, 0x7f, 0x80, 0x80, 0x80, 0x7f, 0x80, 0x81, 0x7f, 0x80, 0x7e, 0x7f, 0x7f, 0x7e, 0x80, 0x7e, 0x7f, 0x7f, 0x7f, 0x7f, 0x7e, 0x7e, 0x7d, 0x7f, 0x7e, 0x7f, 0x7f, 0x7f, 0x80, 0x7f, 0x80, 0x80, 0x7f, 0x80, 0x7f, 0x80, 0x81, 0x81, 0x81, 0x80, 0x80, 0x7f, 0x7f, 0x80, 0x7f, 0x7f, 0x7f, 0x81, 0x81, 0x7f, 0x80, 0x7f, 0x80, 0x7f, 0x7f, 0x7f, 0x7f, 0x80, 0x80, 0x7f, 0x7f, 0x7f, 0x80, 0x80, 0x7f, 0x80, 0x80, 0x81, 0x80, 0x80, 0x7f, 0x7e, 0x7f, 0x7e, 0x7e, 0x7e, 0x7e, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x80, 0x7f, 0x80, 0x80, 0x7f, 0x80, 0x7e, 0x7f, 0x7e }; static const Uint8 right[1777] = { 0x7f, 0x7e, 0x7e, 0x7f, 0x80, 0x80, 0x80, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x82, 0x83, 0x83, 0x83, 0x82, 0x81, 0x81, 0x80, 0x7f, 0x7e, 0x7c, 0x7b, 0x7a, 0x7a, 0x79, 0x79, 0x79, 0x7a, 0x7a, 0x7b, 0x7c, 0x7e, 0x80, 0x82, 0x84, 0x86, 0x88, 0x89, 0x89, 0x89, 0x88, 0x87, 0x84, 0x82, 0x80, 0x7e, 0x7c, 0x7b, 0x7a, 0x7a, 0x79, 0x78, 0x77, 0x75, 0x76, 0x77, 0x78, 0x78, 0x78, 0x7b, 0x81, 0x87, 0x8c, 0x8e, 0x90, 0x92, 0x91, 0x8d, 0x87, 0x81, 0x7d, 0x7b, 0x7a, 0x79, 0x79, 0x7a, 0x79, 0x78, 0x75, 0x74, 0x75, 0x75, 0x75, 0x76, 0x76, 0x76, 0x76, 0x7b, 0x83, 0x88, 0x8b, 0x8f, 0x95, 0x98, 0x95, 0x8d, 0x86, 0x83, 0x80, 0x7e, 0x7c, 0x7c, 0x7e, 0x7e, 0x7c, 0x79, 0x78, 0x76, 0x75, 0x72, 0x73, 0x74, 0x72, 0x6f, 0x6d, 0x72, 0x7e, 0x87, 0x8b, 0x90, 0x98, 0x9f, 0x9b, 0x91, 0x85, 0x7f, 0x7b, 0x78, 0x79, 0x7f, 0x87, 0x8b, 0x8a, 0x89, 0x89, 0x86, 0x81, 0x79, 0x75, 0x74, 0x73, 0x73, 0x6f, 0x6d, 0x6e, 0x6e, 0x6e, 0x6f, 0x72, 0x77, 0x82, 0x8f, 0x95, 0x99, 0x9c, 0x9e, 0x99, 0x8c, 0x7f, 0x74, 0x71, 0x70, 0x74, 0x7e, 0x8a, 0x92, 0x91, 0x8f, 0x8f, 0x8d, 0x85, 0x7c, 0x76, 0x75, 0x76, 0x75, 0x71, 0x6d, 0x6b, 0x68, 0x64, 0x64, 0x66, 0x6e, 0x83, 0x8f, 0x93, 0x9b, 0xa3, 0xa4, 0x97, 0x86, 0x76, 0x6f, 0x6d, 0x6e, 0x78, 0x87, 0x94, 0x98, 0x96, 0x94, 0x91, 0x89, 0x7e, 0x74, 0x6f, 0x70, 0x74, 0x72, 0x6e, 0x6b, 0x67, 0x62, 0x60, 0x60, 0x69, 0x84, 0x91, 0x95, 0xa1, 0xae, 0xb0, 0x9b, 0x84, 0x74, 0x6a, 0x65, 0x67, 0x78, 0x8b, 0x98, 0x9f, 0x9e, 0x9a, 0x90, 0x86, 0x7c, 0x71, 0x6a, 0x6c, 0x73, 0x74, 0x6d, 0x69, 0x65, 0x5e, 0x5c, 0x60, 0x6f, 0x8b, 0x95, 0x9b, 0xac, 0xb3, 0xa5, 0x89, 0x7a, 0x6b, 0x5c, 0x5f, 0x70, 0x88, 0x97, 0xa5, 0xac, 0xa1, 0x95, 0x8e, 0x86, 0x76, 0x6a, 0x6b, 0x72, 0x72, 0x6c, 0x67, 0x5e, 0x55, 0x52, 0x56, 0x78, 0x9c, 0x91, 0x9c, 0xbc, 0xb8, 0x98, 0x83, 0x7f, 0x5e, 0x4c, 0x6c, 0x83, 0x8a, 0x9a, 0xb7, 0xae, 0x8a, 0x8f, 0x93, 0x79, 0x69, 0x76, 0x76, 0x69, 0x70, 0x70, 0x5b, 0x50, 0x51, 0x57, 0x52, 0x77, 0xb2, 0x90, 0x95, 0xc8, 0xb1, 0x8d, 0x89, 0x8a, 0x55, 0x4e, 0x87, 0x7f, 0x82, 0xb3, 0xb9, 0x8f, 0x8c, 0x9d, 0x79, 0x71, 0x80, 0x6a, 0x61, 0x7b, 0x70, 0x51, 0x63, 0x62, 0x3e, 0x50, 0x61, 0x9a, 0xad, 0x7e, 0xba, 0xb5, 0x94, 0x9f, 0x93, 0x75, 0x4b, 0x7b, 0x79, 0x6c, 0xab, 0xaf, 0x9f, 0x93, 0x8e, 0x7a, 0x7f, 0x89, 0x6a, 0x6e, 0x71, 0x66, 0x5e, 0x63, 0x5c, 0x53, 0x53, 0x50, 0x5a, 0xb8, 0xbd, 0x6d, 0xc3, 0xb2, 0x8a, 0xa7, 0xa1, 0x70, 0x4c, 0x88, 0x63, 0x7d, 0xb1, 0xa1, 0xa6, 0x8e, 0x6a, 0x7c, 0x95, 0x8b, 0x84, 0x72, 0x5c, 0x5c, 0x67, 0x64, 0x61, 0x56, 0x65, 0x52, 0x44, 0x80, 0xda, 0x8a, 0x88, 0xc9, 0x89, 0x96, 0xb1, 0x92, 0x4a, 0x6f, 0x6d, 0x78, 0xa5, 0xa7, 0xa0, 0x98, 0x66, 0x6e, 0xa6, 0x9d, 0x95, 0x70, 0x52, 0x57, 0x73, 0x69, 0x72, 0x5a, 0x55, 0x52, 0x50, 0x3d, 0xb8, 0xdb, 0x5d, 0xa9, 0xab, 0x82, 0xad, 0xc3, 0x65, 0x4c, 0x6c, 0x6d, 0x98, 0xac, 0x9f, 0x97, 0x74, 0x5a, 0xa0, 0xb1, 0x9e, 0x7e, 0x52, 0x54, 0x74, 0x71, 0x6a, 0x6a, 0x5a, 0x53, 0x4b, 0x46, 0x5e, 0xe5, 0xaa, 0x62, 0xab, 0x8f, 0x97, 0xcb, 0xa5, 0x4b, 0x4f, 0x67, 0x88, 0xa6, 0xa4, 0x98, 0x84, 0x61, 0x80, 0xb7, 0xb4, 0x98, 0x64, 0x4e, 0x64, 0x77, 0x72, 0x72, 0x55, 0x54, 0x4e, 0x52, 0x3c, 0x96, 0xf0, 0x69, 0x7f, 0xa2, 0x80, 0xc1, 0xc8, 0x75, 0x46, 0x4d, 0x74, 0xa4, 0x9e, 0x95, 0x8a, 0x6a, 0x73, 0xa6, 0xb7, 0xb4, 0x81, 0x60, 0x5e, 0x71, 0x7c, 0x74, 0x6b, 0x54, 0x54, 0x48, 0x4f, 0x44, 0xc3, 0xcb, 0x5b, 0x9b, 0x86, 0x99, 0xd4, 0xa3, 0x71, 0x3e, 0x4b, 0x91, 0x99, 0x9d, 0x95, 0x70, 0x72, 0x85, 0xb0, 0xbd, 0xa5, 0x7e, 0x67, 0x67, 0x78, 0x77, 0x6e, 0x63, 0x53, 0x5b, 0x39, 0x50, 0x48, 0xb5, 0xc2, 0x6a, 0xa5, 0x77, 0xa8, 0xbd, 0x98, 0x89, 0x3a, 0x60, 0x83, 0x85, 0xa9, 0x87, 0x87, 0x74, 0x77, 0xac, 0xa9, 0xb9, 0x8a, 0x71, 0x6b, 0x6d, 0x81, 0x6d, 0x66, 0x51, 0x60, 0x3c, 0x50, 0x4a, 0x91, 0xbf, 0x83, 0xae, 0x7a, 0xa4, 0xa1, 0x97, 0x92, 0x4b, 0x73, 0x68, 0x86, 0x8e, 0x8c, 0x95, 0x79, 0x83, 0x86, 0xa2, 0xab, 0xa6, 0x8d, 0x79, 0x6a, 0x75, 0x68, 0x74, 0x56, 0x5c, 0x4e, 0x4c, 0x49, 0x5d, 0xb1, 0x88, 0xb9, 0x8d, 0xa4, 0x90, 0x94, 0x8b, 0x66, 0x72, 0x69, 0x83, 0x7c, 0x91, 0x82, 0x89, 0x79, 0x87, 0x8a, 0xa1, 0x9f, 0xa5, 0x95, 0x8d, 0x7a, 0x6f, 0x6f, 0x61, 0x62, 0x58, 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Other examples: