From: Tomas Mudrunka <tomas@mudrunka.cz>
Date: Fri, 10 Jun 2022 16:50:22 +0000 (+0200)
Subject: SDL2 audio record test
X-Git-Url: http://git.harvie.cz/?p=mirrors%2FPrograms.git;a=commitdiff_plain;h=bcd9ab567f4a7eb457716ce0f4bfd697ec391645

SDL2 audio record test
---

diff --git a/c/SDL2_record_audio/main.c b/c/SDL2_record_audio/main.c
new file mode 100644
index 0000000..b442782
--- /dev/null
+++ b/c/SDL2_record_audio/main.c
@@ -0,0 +1,44 @@
+//gcc -Wextra -pedantic-errors -o main.out main.c -lSDL2
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <SDL2/SDL.h>
+
+
+void SDL_AudioCallbacks(void* userdata, Uint8* stream, int len) {
+	printf("%d\n", (int)*((int *)stream) );
+}
+
+int main(void) {
+	SDL_AudioSpec want, have;
+	SDL_AudioDeviceID dev;
+
+	SDL_memset(&want, 0, sizeof(want)); /* or SDL_zero(want) */
+	want.freq = 48000;
+	want.format = AUDIO_F32;
+	want.channels = 2; //1,2,4,6
+	want.samples = 4096;
+	want.callback = SDL_AudioCallbacks; /* you wrote this function elsewhere -- see SDL_AudioSpec for details */
+	//want.userdata = NULL;
+
+	if((SDL_Init(SDL_INIT_AUDIO)==-1)) {
+        	printf("Could not initialize SDL: %s.\n", SDL_GetError());
+        	exit(-1);
+    	}
+
+	dev = SDL_OpenAudioDevice(NULL, 1, &want, &have, SDL_AUDIO_ALLOW_FORMAT_CHANGE);
+	if (dev == 0) {
+		SDL_Log("Failed to open audio: %s", SDL_GetError());
+	} else {
+		if (have.format != want.format) { /* we let this one thing change. */
+			SDL_Log("We didn't get Float32 audio format.");
+		}
+		SDL_PauseAudioDevice(dev, 0); /* start audio playing. */
+		SDL_Delay(5000); /* let the audio callback play some sound for 5 seconds. */
+		SDL_CloseAudioDevice(dev);
+	}
+
+    return EXIT_SUCCESS;
+}