Mercurial > sdl-ios-xcode

diff src/audio/SDL_mixer.c @ 0:74212992fb08
Initial revision
author: Sam Lantinga <slouken@lokigames.com>
date: Thu, 26 Apr 2001 16:45:43 +0000
children: cf2af46e9e2a
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/audio/SDL_mixer.c	Thu Apr 26 16:45:43 2001 +0000
@@ -0,0 +1,217 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Sam Lantinga
+    slouken@devolution.com
+*/
+
+#ifdef SAVE_RCSID
+static char rcsid =
+ "@(#) $Id$";
+#endif
+
+/* This provides the default mixing callback for the SDL audio routines */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "SDL_audio.h"
+#include "SDL_mutex.h"
+#include "SDL_timer.h"
+#include "SDL_sysaudio.h"
+
+
+/* This table is used to add two sound values together and pin
+ * the value to avoid overflow.  (used with permission from ARDI)
+ * Changed to use 0xFE instead of 0xFF for better sound quality.
+ */
+static const Uint8 mix8[] =
+{
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03,
+  0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
+  0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
+  0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24,
+  0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
+  0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A,
+  0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45,
+  0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
+  0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B,
+  0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
+  0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71,
+  0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C,
+  0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+  0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92,
+  0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D,
+  0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8,
+  0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3,
+  0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE,
+  0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9,
+  0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4,
+  0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
+  0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA,
+  0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5,
+  0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFE, 0xFE,
+  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
+  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
+  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
+  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
+  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
+  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
+  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
+  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
+  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
+  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
+  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
+  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE
+};
+
+/* The volume ranges from 0 - 128 */
+#define ADJUST_VOLUME(s, v)	(s = (s*v)/SDL_MIX_MAXVOLUME)
+#define ADJUST_VOLUME_U8(s, v)	(s = (((s-128)*v)/SDL_MIX_MAXVOLUME)+128)
+
+void SDL_MixAudio (Uint8 *dst, Uint8 *src, Uint32 len, int volume)
+{
+	Uint16 format;
+
+	if ( volume == 0 ) {
+		return;
+	}
+	/* Mix the user-level audio format */
+	if ( current_audio ) {
+		if ( current_audio->convert.needed ) {
+			format = current_audio->convert.src_format;
+		} else {
+			format = current_audio->spec.format;
+		}
+	} else {
+  		/* HACK HACK HACK */
+		format = AUDIO_S16;
+	}
+	switch (format) {
+
+		case AUDIO_U8: {
+			Uint8 src_sample;
+
+			while ( len-- ) {
+				src_sample = *src;
+				ADJUST_VOLUME_U8(src_sample, volume);
+				*dst = mix8[*dst+src_sample];
+				++dst;
+				++src;
+			}
+		}
+		break;
+
+		case AUDIO_S8: {
+			Sint8 *dst8, *src8;
+			Sint8 src_sample;
+			int dst_sample;
+			const int max_audioval = ((1<<(8-1))-1);
+			const int min_audioval = -(1<<(8-1));
+
+			src8 = (Sint8 *)src;
+			dst8 = (Sint8 *)dst;
+			while ( len-- ) {
+				src_sample = *src8;
+				ADJUST_VOLUME(src_sample, volume);
+				dst_sample = *dst8 + src_sample;
+				if ( dst_sample > max_audioval ) {
+					*dst8 = max_audioval;
+				} else
+				if ( dst_sample < min_audioval ) {
+					*dst8 = min_audioval;
+				} else {
+					*dst8 = dst_sample;
+				}
+				++dst8;
+				++src8;
+			}
+		}
+		break;
+
+		case AUDIO_S16LSB: {
+			Sint16 src1, src2;
+			int dst_sample;
+			const int max_audioval = ((1<<(16-1))-1);
+			const int min_audioval = -(1<<(16-1));
+
+			len /= 2;
+			while ( len-- ) {
+				src1 = ((src[1])<<8|src[0]);
+				ADJUST_VOLUME(src1, volume);
+				src2 = ((dst[1])<<8|dst[0]);
+				src += 2;
+				dst_sample = src1+src2;
+				if ( dst_sample > max_audioval ) {
+					dst_sample = max_audioval;
+				} else
+				if ( dst_sample < min_audioval ) {
+					dst_sample = min_audioval;
+				}
+				dst[0] = dst_sample&0xFF;
+				dst_sample >>= 8;
+				dst[1] = dst_sample&0xFF;
+				dst += 2;
+			}
+		}
+		break;
+
+		case AUDIO_S16MSB: {
+			Sint16 src1, src2;
+			int dst_sample;
+			const int max_audioval = ((1<<(16-1))-1);
+			const int min_audioval = -(1<<(16-1));
+
+			len /= 2;
+			while ( len-- ) {
+				src1 = ((src[0])<<8|src[1]);
+				ADJUST_VOLUME(src1, volume);
+				src2 = ((dst[0])<<8|dst[1]);
+				src += 2;
+				dst_sample = src1+src2;
+				if ( dst_sample > max_audioval ) {
+					dst_sample = max_audioval;
+				} else
+				if ( dst_sample < min_audioval ) {
+					dst_sample = min_audioval;
+				}
+				dst[1] = dst_sample&0xFF;
+				dst_sample >>= 8;
+				dst[0] = dst_sample&0xFF;
+				dst += 2;
+			}
+		}
+		break;
+
+		default: /* If this happens... FIXME! */
+			SDL_SetError("SDL_MixAudio(): unknown audio format");
+			return;
+	}
+}
author	Sam Lantinga <slouken@lokigames.com>
date	Thu, 26 Apr 2001 16:45:43 +0000
parents
children	cf2af46e9e2a