From 673a8424eab7ae2c208b794e07f97a1b1ed7c20a Mon Sep 17 00:00:00 2001
From: Ragnvald Maartmann-Moe IV <despair@users.sourceforge.net>
Date: Fri, 8 Dec 2000 00:17:22 +0000
Subject: [PATCH] Add sdl sound output support. Needs Makefile/auto* work
 before enabling.

---
 source/snd_sdl.c | 155 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 155 insertions(+)
 create mode 100644 source/snd_sdl.c

diff --git a/source/snd_sdl.c b/source/snd_sdl.c
new file mode 100644
index 0000000..82e17a0
--- /dev/null
+++ b/source/snd_sdl.c
@@ -0,0 +1,155 @@
+/*
+	snd_sdl.c
+
+	(description)
+
+	Copyright (C) 1996-1997  Id Software, Inc.
+
+	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:
+
+		Free Software Foundation, Inc.
+		59 Temple Place - Suite 330
+		Boston, MA  02111-1307, USA
+
+	$Id$
+*/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <SDL_audio.h>
+#include <SDL_byteorder.h>
+
+#include "console.h"
+#include "qargs.h"
+#include "sound.h"
+#include "cmd.h"
+
+static dma_t the_shm;
+static int snd_inited;
+
+extern int desired_speed;
+extern int desired_bits;
+
+static void paint_audio(void *unused, Uint8 *stream, int len)
+{
+	if ( shm ) {
+		shm->buffer = stream;
+		shm->samplepos += len/(shm->samplebits/8);
+		// Check for samplepos overflow?
+		S_PaintChannels (shm->samplepos);
+	}
+}
+
+qboolean SNDDMA_Init(void)
+{
+	SDL_AudioSpec desired, obtained;
+
+	snd_inited = 0;
+
+	/* Set up the desired format */
+	desired.freq = desired_speed;
+	switch (desired_bits) {
+		case 8:
+			desired.format = AUDIO_U8;
+			break;
+		case 16:
+			if ( SDL_BYTEORDER == SDL_BIG_ENDIAN )
+				desired.format = AUDIO_S16MSB;
+			else
+				desired.format = AUDIO_S16LSB;
+			break;
+		default:
+        		Con_Printf("Unknown number of audio bits: %d\n",
+								desired_bits);
+			return 0;
+	}
+	desired.channels = 2;
+	desired.samples = 512;
+	desired.callback = paint_audio;
+
+	/* Open the audio device */
+	if ( SDL_OpenAudio(&desired, &obtained) < 0 ) {
+        	Con_Printf("Couldn't open SDL audio: %s\n", SDL_GetError());
+		return 0;
+	}
+
+	/* Make sure we can support the audio format */
+	switch (obtained.format) {
+		case AUDIO_U8:
+			/* Supported */
+			break;
+		case AUDIO_S16LSB:
+		case AUDIO_S16MSB:
+			if ( ((obtained.format == AUDIO_S16LSB) &&
+			     (SDL_BYTEORDER == SDL_LIL_ENDIAN)) ||
+			     ((obtained.format == AUDIO_S16MSB) &&
+			     (SDL_BYTEORDER == SDL_BIG_ENDIAN)) ) {
+				/* Supported */
+				break;
+			}
+			/* Unsupported, fall through */;
+		default:
+			/* Not supported -- force SDL to do our bidding */
+			SDL_CloseAudio();
+			if ( SDL_OpenAudio(&desired, NULL) < 0 ) {
+        			Con_Printf("Couldn't open SDL audio: %s\n",
+							SDL_GetError());
+				return 0;
+			}
+			memcpy(&obtained, &desired, sizeof(desired));
+			break;
+	}
+	SDL_PauseAudio(0);
+
+	/* Fill the audio DMA information block */
+	shm = &the_shm;
+	shm->splitbuffer = 0;
+	shm->samplebits = (obtained.format & 0xFF);
+	shm->speed = obtained.freq;
+	shm->channels = obtained.channels;
+	shm->samples = obtained.samples*shm->channels;
+	shm->samplepos = 0;
+	shm->submission_chunk = 1;
+	shm->buffer = NULL;
+
+	snd_inited = 1;
+	return 1;
+}
+
+int SNDDMA_GetDMAPos(void)
+{
+	return shm->samplepos;
+}
+
+void SNDDMA_Shutdown(void)
+{
+	if (snd_inited) {
+		SDL_CloseAudio();
+		snd_inited = 0;
+	}
+}
+
+/*
+
+	SNDDMA_Submit
+
+	Send sound to device if buffer isn't really the dma buffer
+
+*/
+void SNDDMA_Submit(void)
+{
+}
+