diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt index 58406f6221..6efc021546 100644 --- a/examples/CMakeLists.txt +++ b/examples/CMakeLists.txt @@ -141,6 +141,7 @@ add_sdl_example_executable(audio-simple-playback SOURCES audio/01-simple-playbac add_sdl_example_executable(audio-simple-playback-callback SOURCES audio/02-simple-playback-callback/simple-playback-callback.c) add_sdl_example_executable(audio-load-wav SOURCES audio/03-load-wav/load-wav.c DATAFILES ${CMAKE_CURRENT_SOURCE_DIR}/../test/sample.wav) add_sdl_example_executable(audio-multiple-streams SOURCES audio/04-multiple-streams/multiple-streams.c DATAFILES ${CMAKE_CURRENT_SOURCE_DIR}/../test/sample.wav ${CMAKE_CURRENT_SOURCE_DIR}/../test/sword.wav) +add_sdl_example_executable(audio-planar-data SOURCES audio/05-planar-data/planar-data.c) add_sdl_example_executable(input-joystick-polling SOURCES input/01-joystick-polling/joystick-polling.c) add_sdl_example_executable(input-joystick-events SOURCES input/02-joystick-events/joystick-events.c) add_sdl_example_executable(camera-read-and-draw SOURCES camera/01-read-and-draw/read-and-draw.c) diff --git a/examples/audio/05-planar-data/README.txt b/examples/audio/05-planar-data/README.txt new file mode 100644 index 0000000000..c7bd0ab5e8 --- /dev/null +++ b/examples/audio/05-planar-data/README.txt @@ -0,0 +1,7 @@ +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. diff --git a/examples/audio/05-planar-data/onmouseover.webp b/examples/audio/05-planar-data/onmouseover.webp new file mode 100644 index 0000000000..90880c9e45 Binary files /dev/null and b/examples/audio/05-planar-data/onmouseover.webp differ diff --git a/examples/audio/05-planar-data/planar-data.c b/examples/audio/05-planar-data/planar-data.c new file mode 100644 index 0000000000..ab67999ab9 --- /dev/null +++ b/examples/audio/05-planar-data/planar-data.c @@ -0,0 +1,366 @@ +/* + * 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 +#include + +/* 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, 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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, + 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