Load large WAV files

Large WAV files can now be played. Tested working with 77MiB WAV files.

Known issues:
- First kilobytes of WAV file isn't played.
- Screen doesn't turn on after 3DS placed in sleep mode.

Signed-off-by: Mahyar Koshkouei <deltabeard@users.noreply.github.com>

source/main.c

@@ -1,9 +1,143 @@
+/**
+ * ctrmus - 3DS Music Player
+ * Copyright (C) 2016 Mahyar Koshkouei
+ *
+ * This program comes with ABSOLUTELY NO WARRANTY and is free software. You are
+ * welcome to redistribute it under certain conditions; for details see the
+ * LICENCE file.
+ */
+
 #include <3ds.h>
 #include <stdio.h>
 
+#define BUFFER_SIZE 64 * 1024 * 1024
+
+int playWav(const char *wav);
+
 int main()
 {
-	puts("Stub");
+	gfxInitDefault();
+	consoleInit(GFX_BOTTOM, NULL);
 
+	puts("Initializing CSND...");
+
+	if(R_FAILED(csndInit()))
+	{
+		printf("Error %d: Could not initialize CSND.", __LINE__);
+		goto err;
+	}
+	else
+		puts("CSND initialized.");
+
+	/**
+	 * Open File
+	 * Read 16 kb from file
+	 * Play 16 kb buffer
+	 * Wait until finished playing
+	 *  Read next 16 kb in the meantime
+	 * Play next chunk
+	 * Continue until end of file
+	 */
+
+	while(aptMainLoop())
+	{
+		u32 kDown;
+		u8 ret;
+
+		hidScanInput();
+		gspWaitForVBlank();
+		kDown = hidKeysDown();
+
+		if(kDown & KEY_START)
+			break;
+
+		if(kDown & KEY_A && (ret = playWav("sdmc:/audio/audio3.wav") != 0))
+		{
+			printf("Error ");
+			switch(ret)
+			{
+				case 1:
+					printf("%d: Audio file missing.\n", __LINE__);
+					break;
+
+				case 2:
+					printf("%d: \"csnd\" init failed.\n", __LINE__);
+					break;
+
+				default:
+					printf("%d: Unknown.\n", __LINE__);
+					break;
+			}
+		}
+
+		gfxFlushBuffers();
+		gfxSwapBuffers();
+	}
+
+out:
+	puts("Exiting...");
+
+	csndExit();
+	gfxExit();
+	return 0;
+
+err:
+	puts("An error occurred. Exiting in 5 seconds.");
+	goto out;
+}
+
+/**
+ * Plays a WAV file.
+ *
+ * \param	file	File location of WAV file.
+ * \return			Zero if successful, else failure.
+ */
+int playWav(const char *wav)
+{
+	FILE *file		= fopen(wav, "rb");
+	u8* buffer;
+	off_t bytesRead;
+	off_t size;
+
+	printf("Got to line %d\n", __LINE__);
+
+	if(file == NULL)
+		return 1;
+
+	fseek(file, 0, SEEK_END);
+	size = ftell(file);
+	fseek(file, 0, SEEK_SET);
+
+	printf("Got to line %d. Size: %d\n", __LINE__, size);
+	if(size > 1131072)
+		size = 1131072;
+
+	printf("Got to line %d\n", __LINE__);
+	buffer = linearAlloc(size);
+
+	printf("Got to line %d. Size: %d\n", __LINE__, size);
+	while((bytesRead = fread(buffer, 1, size, file)) > 0)
+	{
+		u8 status = 1;
+
+		while(status != 0)
+			csndIsPlaying(8, &status);
+
+		printf("Got to line %d. Read %d bytes\n", __LINE__, bytesRead);
+		if(csndPlaySound(8, SOUND_FORMAT_16BIT | SOUND_ONE_SHOT, 48000, 1, 0,
+					buffer, buffer, size) != 0)
+		{
+			printf("Error %d.\n", __LINE__);
+		}
+
+		printf("Line %d: status: %d", __LINE__, status);
+
+		printf("Got to line %d\n", __LINE__);
+
+
+	}
+
+	printf("Got to line %d\n", __LINE__);
+	linearFree(buffer);
 	return 0;
 }