Initial commit

example-test-code/temp.cpp

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+#include <SDL2/SDL.h>
+#include <SDL2/SDL_audio.h>
+#include <SDL2/SDL_image.h>
+#include <SDL2/SDL_ttf.h>
+
+using namespace std;
+
+SDL_AudioSpec want, have;
+SDL_AudioDeviceID player;
+
+void SDLCALL callback_player( void* userdata, Uint8* stream, int len)
+{
+
+	for (int i = 0; i < len; i ++) {
+		auto value = Uint8(sin(i) * 1000);
+		stream[i] = value ;
+	}
+}
+
+auto setupAudioPlayer()
+{
+
+	printf("### Device Player ###\n");
+	int num = SDL_GetNumAudioDevices(false);
+	printf("num: %d\n", num);
+	for (int i = 0; i < num; i++) {
+		auto name = SDL_GetAudioDeviceName(i, false);
+		printf("%d: %s\n", i, name);
+	}
+
+	int deviceIndex;
+	printf("select device to player audio: ");
+	scanf("%d", &deviceIndex);
+	printf("\n");
+
+	SDL_memset(&want, 0, sizeof(want)); /* or SDL_zero(want) */
+	want.freq = 44100;
+	want.format = AUDIO_F32;
+	want.channels = 2;
+	want.samples = 1024;
+	want.callback = callback_player;  // you wrote this function elsewhere.
+	//want.size = 512;
+
+	SDL_AudioDeviceID player = SDL_OpenAudioDevice(SDL_GetAudioDeviceName(deviceIndex, false), SDL_FALSE, &want, &have, SDL_AUDIO_ALLOW_FORMAT_CHANGE);
+	if (player == 0) {
+		printf("Failed to open player device! SDL Error: %s", SDL_GetError());
+
+	} else {
+
+		printf("freq %d \nformat %d \nchannels %d \nsamples %d\n", have.freq, have.format, have.channels, have.samples);
+	}
+
+	return player;
+}
+
+void destroyAudio()
+{
+
+	SDL_CloseAudioDevice(player);
+	SDL_Quit();
+}
+
+int main(int n, char** args)
+{
+
+	int err = SDL_Init(SDL_INIT_AUDIO);
+	printf("error: %d", err);
+	if (err < 0) {
+		printf("erorr: %d\n", err);
+		printf("Failed to init audio! SDL Error: %s", SDL_GetError());
+	}
+	//recorder = setupAudioRecorder();
+	auto player = setupAudioPlayer();
+	printf("player: %d\n", player);
+	//loadWave();
+
+	printf("playing\n");
+	//SDL_PauseAudioDevice(recorder, 0);
+	SDL_PauseAudioDevice(player, 0);
+	//SDL_SemWait(sem);
+	SDL_Delay(10000);
+	destroyAudio();
+	//system("pause");
+	return 0;
+}