From ef79bbde537d6b9c745a7d86cb9df1d04c35590d Mon Sep 17 00:00:00 2001
From: PCSX* teams
Date: Tue, 16 Nov 2010 14:15:22 +0200
Subject: pcsxr-1.9.92

---
 plugins/dfsound/sdl.c | 135 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 plugins/dfsound/sdl.c

(limited to 'plugins/dfsound/sdl.c')

diff --git a/plugins/dfsound/sdl.c b/plugins/dfsound/sdl.c
new file mode 100644
index 0000000..45ccba2
--- /dev/null
+++ b/plugins/dfsound/sdl.c
@@ -0,0 +1,135 @@
+/* SDL Driver for P.E.Op.S Sound Plugin
+ * Copyright (c) 2010, Wei Mingzhi <whistler_wmz@users.sf.net>.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA
+ */
+
+#include "stdafx.h"
+
+#include "externals.h"
+#include <SDL.h>
+
+#define BUFFER_SIZE		22050
+
+short			*pSndBuffer = NULL;
+int				iBufSize = 0;
+volatile int	iReadPos = 0, iWritePos = 0;
+
+static void SOUND_FillAudio(void *unused, Uint8 *stream, int len) {
+	short *p = (short *)stream;
+
+	len /= sizeof(short);
+
+	while (iReadPos != iWritePos && len > 0) {
+		*p++ = pSndBuffer[iReadPos++];
+		if (iReadPos >= iBufSize) iReadPos = 0;
+		--len;
+	}
+
+	// Fill remaining space with zero
+	while (len > 0) {
+		*p++ = 0;
+		--len;
+	}
+}
+
+static void InitSDL() {
+	if (SDL_WasInit(SDL_INIT_EVERYTHING)) {
+		SDL_InitSubSystem(SDL_INIT_AUDIO);
+	} else {
+		SDL_Init(SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE);
+	}
+}
+
+static void DestroySDL() {
+	if (SDL_WasInit(SDL_INIT_EVERYTHING & ~SDL_INIT_AUDIO)) {
+		SDL_QuitSubSystem(SDL_INIT_AUDIO);
+	} else {
+		SDL_Quit();
+	}
+}
+
+void SetupSound(void) {
+	SDL_AudioSpec				spec;
+
+	if (pSndBuffer != NULL) return;
+
+	InitSDL();
+
+	spec.freq = 44100;
+	spec.format = AUDIO_S16SYS;
+	spec.channels = iDisStereo ? 1 : 2;
+	spec.samples = 512;
+	spec.callback = SOUND_FillAudio;
+
+	if (SDL_OpenAudio(&spec, NULL) < 0) {
+		DestroySDL();
+		return;
+	}
+
+	iBufSize = BUFFER_SIZE;
+	if (iDisStereo) iBufSize /= 2;
+
+	pSndBuffer = (short *)malloc(iBufSize * sizeof(short));
+	if (pSndBuffer == NULL) {
+		SDL_CloseAudio();
+		return;
+	}
+
+	iReadPos = 0;
+	iWritePos = 0;
+
+	SDL_PauseAudio(0);
+}
+
+void RemoveSound(void) {
+	if (pSndBuffer == NULL) return;
+
+	SDL_CloseAudio();
+	DestroySDL();
+
+	free(pSndBuffer);
+	pSndBuffer = NULL;
+}
+
+unsigned long SoundGetBytesBuffered(void) {
+	int size;
+
+	if (pSndBuffer == NULL) return SOUNDSIZE;
+
+	size = iReadPos - iWritePos;
+	if (size <= 0) size += iBufSize;
+
+	if (size < iBufSize / 2) return SOUNDSIZE;
+
+	return 0;
+}
+
+void SoundFeedStreamData(unsigned char *pSound, long lBytes) {
+	short *p = (short *)pSound;
+
+	if (pSndBuffer == NULL) return;
+
+	while (lBytes > 0) {
+		if (((iWritePos + 1) % iBufSize) == iReadPos) break;
+
+		pSndBuffer[iWritePos] = *p++;
+
+		++iWritePos;
+		if (iWritePos >= iBufSize) iWritePos = 0;
+
+		lBytes -= sizeof(short);
+	}
+}
-- 
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