implement AudioStream and volume
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parent
2111478773
commit
bf9b5580e0
2
Makefile
2
Makefile
@ -1,4 +1,4 @@
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CC_SDL=`sdl2-config --cflags --libs`
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all:
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cc *.c -o sdlamp -std=c11 $(CC_SDL)
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cc *.c -o sdlamp -std=c11 $(CC_SDL) -Wall
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144
sdlamp.c
144
sdlamp.c
@ -1,10 +1,18 @@
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#include <stdio.h>
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#include "SDL.h"
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#include "SDL_audio.h"
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#include "SDL_error.h"
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#include "SDL_events.h"
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#include "SDL_mouse.h"
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#define KB(x) (1024 * (x))
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static SDL_AudioDeviceID audio_device = 0;
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static SDL_Window *window = NULL;
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static SDL_Renderer *renderer = NULL;
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static SDL_AudioDeviceID audio_device = 0;
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static SDL_AudioStream *stream = NULL;
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static float volume_slider_value = 1.0f;
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#if defined(__clang__) || defined(__GNUC__)
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static void panic_and_abort(const char *title, const char *text) __attribute__((noreturn));
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@ -16,6 +24,44 @@ static void panic_and_abort(const char *title, const char *text) {
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exit(1);
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}
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// TODO: Refactor this nonsense into a struct
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static Uint8 *wavbuf = NULL;
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static Uint32 wavlen = 0;
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static Uint32 wavpos = 0;
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static SDL_AudioSpec wavspec;
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static SDL_bool open_audio_file(const char *fname) {
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SDL_FreeAudioStream(stream);
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stream = NULL;
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SDL_FreeWAV(wavbuf);
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wavbuf = NULL;
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wavlen = 0;
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wavpos = 0;
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if (SDL_LoadWAV(fname, &wavspec, &wavbuf, &wavlen) == NULL) {
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SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't load wav file!", SDL_GetError(), window);
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return SDL_FALSE;
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}
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stream = SDL_NewAudioStream(wavspec.format, wavspec.channels, wavspec.freq, AUDIO_F32, 2, 48000);
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if (!stream) {
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SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't create audiostream!", SDL_GetError(), window);
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SDL_FreeWAV(wavbuf);
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wavbuf = NULL;
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wavlen = 0;
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wavpos = 0;
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return SDL_FALSE;
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}
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if (SDL_AudioStreamPut(stream, wavbuf, wavlen) == -1) { // FIXME: graceful handling
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panic_and_abort("Audio stream put failed", SDL_GetError());
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}
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SDL_AudioStreamFlush(stream); // FIXME: error handling
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return SDL_TRUE;
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}
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int main(int argc, char **argv) {
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if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
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panic_and_abort("SDL_Init failed", SDL_GetError());
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@ -31,15 +77,35 @@ int main(int argc, char **argv) {
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panic_and_abort("SDL_CreateRenderer failed", SDL_GetError());
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}
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// Enable dropfile events
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SDL_AudioSpec desired;
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SDL_zero(desired);
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desired.freq = 48000;
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desired.format = AUDIO_F32;
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desired.channels = 2;
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desired.samples = 4096;
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desired.callback = NULL;
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audio_device = SDL_OpenAudioDevice(NULL, 0, &desired, NULL, 0);
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if (audio_device == 0) {
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panic_and_abort("Couldn't load audio device!", SDL_GetError());
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}
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// Enable events
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SDL_EventState(SDL_DROPFILE, SDL_ENABLE);
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SDL_EventState(SDL_MOUSEMOTION, SDL_ENABLE);
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const SDL_Rect rewind_rect = {100, 100, 100, 100};
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const SDL_Rect pause_rect = {400, 100, 100, 100};
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// TODO: Remove temp load
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open_audio_file("CantinaBand60.wav");
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SDL_AudioSpec wavspec;
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Uint8 *wavbuf = NULL;
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Uint32 wavlen = 0;
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const SDL_Rect rewind_rect = {(1024 - 100) / 3, 100, 100, 100};
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const SDL_Rect pause_rect = {((1024 - 100) / 3) * 2 , 100, 100, 100};
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const SDL_Rect volume_rect = {(1024 - 500) / 2, 400, 500, 20};
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SDL_Rect volume_knob = {
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(volume_rect.x + volume_rect.w) - volume_knob.w,
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volume_rect.y,
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20,
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volume_rect.h
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};
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SDL_bool paused = SDL_TRUE;
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SDL_bool quit = SDL_FALSE;
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@ -53,46 +119,54 @@ int main(int argc, char **argv) {
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case SDL_MOUSEBUTTONDOWN: {
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SDL_Point pt = { e.button.x, e.button.y };
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if (SDL_PointInRect(&pt, &rewind_rect)) {
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if (SDL_PointInRect(&pt, &rewind_rect)) { // Pressed the "rewind" button
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SDL_ClearQueuedAudio(audio_device);
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SDL_QueueAudio(audio_device, wavbuf, wavlen);
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} else if (SDL_PointInRect(&pt, &pause_rect)) {
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SDL_AudioStreamClear(stream);
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if (SDL_AudioStreamPut(stream, wavbuf, wavlen) == -1) { // FIXME: graceful handling
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panic_and_abort("Audio stream put failed", SDL_GetError());
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}
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SDL_AudioStreamFlush(stream);
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} else if (SDL_PointInRect(&pt, &pause_rect)) { // Pressed the "pause" button
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paused = paused ? SDL_FALSE : SDL_TRUE;
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SDL_PauseAudioDevice(audio_device, paused);
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}
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break;
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}
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case SDL_MOUSEMOTION: {
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SDL_Point pt = { e.motion.x, e.motion.y };
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if (SDL_PointInRect(&pt, &volume_rect) && (e.motion.state & SDL_BUTTON_LMASK)) { // left mouse pressed inside the "volume" slider
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const float fx = (float)(pt.x - volume_rect.x);
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volume_slider_value = (fx / (float)volume_rect.w);
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volume_knob.x = pt.x - (volume_knob.w / 2);
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volume_knob.x = SDL_max(volume_knob.x, volume_rect.x);
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volume_knob.x = SDL_min(volume_knob.x, (volume_rect.x + volume_rect.w) - volume_knob.w);
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}
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break;
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}
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case SDL_DROPFILE: {
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if (audio_device) {
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SDL_CloseAudioDevice(audio_device);
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audio_device = 0;
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}
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SDL_FreeWAV(wavbuf);
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wavbuf = NULL;
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wavlen = 0;
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if (SDL_LoadWAV(e.drop.file, &wavspec, &wavbuf, &wavlen) == NULL) {
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SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't load wav file!", SDL_GetError(), window);
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}
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audio_device = SDL_OpenAudioDevice(NULL, 0, &wavspec, NULL, 0);
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if (audio_device == 0) {
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SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't load audio device!", SDL_GetError(), window);
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SDL_free(wavbuf);
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wavbuf = NULL;
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wavlen = 0;
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} else {
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SDL_QueueAudio(audio_device, wavbuf, wavlen);
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SDL_PauseAudioDevice(audio_device, 0);
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}
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open_audio_file(e.drop.file);
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SDL_free(e.drop.file);
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break;
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}
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}
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}
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if (SDL_GetQueuedAudioSize(audio_device) < KB(8)) {
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const int bytes_remaining = SDL_AudioStreamAvailable(stream);
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if (bytes_remaining > 0) {
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const int new_bytes = SDL_min(bytes_remaining, KB(32));
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static Uint8 converted_buffer[KB(32)];
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SDL_AudioStreamGet(stream, converted_buffer, new_bytes); // FIXME: Error checking
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const int num_samples = (new_bytes / sizeof(float));
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float *samples = (float*)converted_buffer;
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for (size_t i = 0; i < num_samples; ++i) {
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samples[i] *= volume_slider_value;
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}
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SDL_QueueAudio(audio_device, converted_buffer, new_bytes);
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}
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}
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SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
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SDL_RenderClear(renderer);
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@ -100,6 +174,10 @@ int main(int argc, char **argv) {
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SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
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SDL_RenderFillRect(renderer, &rewind_rect);
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SDL_RenderFillRect(renderer, &pause_rect);
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SDL_RenderFillRect(renderer, &volume_rect);
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SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);
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SDL_RenderFillRect(renderer, &volume_knob);
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SDL_RenderPresent(renderer);
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}
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