src/audio/SDL_mixer.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 19 Feb 2006 23:46:34 +0000
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parent 1358 c71e05b4dc2e
child 1402 d910939febfa
permissions -rw-r--r--
Use only safe string functions
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/* This provides the default mixing callback for the SDL audio routines */
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#include "SDL_cpuinfo.h"
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#include "SDL_timer.h"
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#include "SDL_audio.h"
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#include "SDL_sysaudio.h"
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#include "SDL_mixer_MMX.h"
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#include "SDL_mixer_MMX_VC.h"
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#include "SDL_mixer_m68k.h"
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/* This table is used to add two sound values together and pin
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 * the value to avoid overflow.  (used with permission from ARDI)
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 * Changed to use 0xFE instead of 0xFF for better sound quality.
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 */
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static const Uint8 mix8[] =
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{
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};
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/* The volume ranges from 0 - 128 */
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#define ADJUST_VOLUME(s, v)	(s = (s*v)/SDL_MIX_MAXVOLUME)
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#define ADJUST_VOLUME_U8(s, v)	(s = (((s-128)*v)/SDL_MIX_MAXVOLUME)+128)
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void SDL_MixAudio (Uint8 *dst, const Uint8 *src, Uint32 len, int volume)
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{
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	Uint16 format;
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	if ( volume == 0 ) {
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		return;
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	}
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	/* Mix the user-level audio format */
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	if ( current_audio ) {
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		if ( current_audio->convert.needed ) {
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			format = current_audio->convert.src_format;
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		} else {
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			format = current_audio->spec.format;
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		}
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	} else {
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  		/* HACK HACK HACK */
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		format = AUDIO_S16;
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	}
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	switch (format) {
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		case AUDIO_U8: {
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#if defined(__M68000__) && defined(__GNUC__)
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			SDL_MixAudio_m68k_U8((char*)dst,(char*)src,(unsigned long)len,(long)volume,(char *)mix8);
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#else
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			Uint8 src_sample;
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			while ( len-- ) {
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				src_sample = *src;
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				ADJUST_VOLUME_U8(src_sample, volume);
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				*dst = mix8[*dst+src_sample];
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				++dst;
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				++src;
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			}
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#endif
0
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		}
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		break;
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   128
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		case AUDIO_S8: {
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#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
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			if (SDL_HasMMX())
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			{
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				SDL_MixAudio_MMX_S8((char*)dst,(char*)src,(unsigned int)len,(int)volume);
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			}
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			else
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#endif
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#if defined(USE_ASM_MIXER_VC)
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			if (SDL_HasMMX())
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			{
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				SDL_MixAudio_MMX_S8_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume);
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			}
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			else
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   143
#endif
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#if defined(__M68000__) && defined(__GNUC__)
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			SDL_MixAudio_m68k_S8((char*)dst,(char*)src,(unsigned long)len,(long)volume);
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#else
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			{
0
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			Sint8 *dst8, *src8;
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			Sint8 src_sample;
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			int dst_sample;
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			const int max_audioval = ((1<<(8-1))-1);
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			const int min_audioval = -(1<<(8-1));
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			src8 = (Sint8 *)src;
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			dst8 = (Sint8 *)dst;
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			while ( len-- ) {
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				src_sample = *src8;
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				ADJUST_VOLUME(src_sample, volume);
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				dst_sample = *dst8 + src_sample;
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				if ( dst_sample > max_audioval ) {
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					*dst8 = max_audioval;
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				} else
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				if ( dst_sample < min_audioval ) {
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					*dst8 = min_audioval;
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   165
				} else {
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					*dst8 = dst_sample;
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   167
				}
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				++dst8;
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   169
				++src8;
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			}
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   171
			}
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   172
#endif
0
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   173
		}
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		break;
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   175
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		case AUDIO_S16LSB: {
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#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
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			if (SDL_HasMMX())
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			{
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				SDL_MixAudio_MMX_S16((char*)dst,(char*)src,(unsigned int)len,(int)volume);
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   181
			}
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   182
			else
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   183
#elif defined(USE_ASM_MIXER_VC)
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			if (SDL_HasMMX())
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   185
			{
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   186
				SDL_MixAudio_MMX_S16_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume);
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   187
			}
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   188
			else
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   189
#endif
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   190
#if defined(__M68000__) && defined(__GNUC__)
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   191
			SDL_MixAudio_m68k_S16LSB((short*)dst,(short*)src,(unsigned long)len,(long)volume);
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   192
#else
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   193
			{
0
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   194
			Sint16 src1, src2;
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   195
			int dst_sample;
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   196
			const int max_audioval = ((1<<(16-1))-1);
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   197
			const int min_audioval = -(1<<(16-1));
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   198
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   199
			len /= 2;
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   200
			while ( len-- ) {
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   201
				src1 = ((src[1])<<8|src[0]);
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   202
				ADJUST_VOLUME(src1, volume);
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   203
				src2 = ((dst[1])<<8|dst[0]);
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   204
				src += 2;
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   205
				dst_sample = src1+src2;
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diff changeset
   206
				if ( dst_sample > max_audioval ) {
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   207
					dst_sample = max_audioval;
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diff changeset
   208
				} else
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   209
				if ( dst_sample < min_audioval ) {
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   210
					dst_sample = min_audioval;
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diff changeset
   211
				}
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   212
				dst[0] = dst_sample&0xFF;
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   213
				dst_sample >>= 8;
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diff changeset
   214
				dst[1] = dst_sample&0xFF;
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diff changeset
   215
				dst += 2;
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diff changeset
   216
			}
539
a9e38f3b8e4d Added MMX audio mixing code for gcc (thanks Stephane!)
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diff changeset
   217
			}
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   218
#endif
0
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diff changeset
   219
		}
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   220
		break;
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diff changeset
   221
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   222
		case AUDIO_S16MSB: {
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diff changeset
   223
#if defined(__M68000__) && defined(__GNUC__)
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   224
			SDL_MixAudio_m68k_S16MSB((short*)dst,(short*)src,(unsigned long)len,(long)volume);
873c2598f969 Add m68k assembly mixing routines
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diff changeset
   225
#else
0
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   226
			Sint16 src1, src2;
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   227
			int dst_sample;
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   228
			const int max_audioval = ((1<<(16-1))-1);
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diff changeset
   229
			const int min_audioval = -(1<<(16-1));
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parents:
diff changeset
   230
74212992fb08 Initial revision
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diff changeset
   231
			len /= 2;
74212992fb08 Initial revision
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parents:
diff changeset
   232
			while ( len-- ) {
74212992fb08 Initial revision
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diff changeset
   233
				src1 = ((src[0])<<8|src[1]);
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diff changeset
   234
				ADJUST_VOLUME(src1, volume);
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diff changeset
   235
				src2 = ((dst[0])<<8|dst[1]);
74212992fb08 Initial revision
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parents:
diff changeset
   236
				src += 2;
74212992fb08 Initial revision
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parents:
diff changeset
   237
				dst_sample = src1+src2;
74212992fb08 Initial revision
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parents:
diff changeset
   238
				if ( dst_sample > max_audioval ) {
74212992fb08 Initial revision
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parents:
diff changeset
   239
					dst_sample = max_audioval;
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parents:
diff changeset
   240
				} else
74212992fb08 Initial revision
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parents:
diff changeset
   241
				if ( dst_sample < min_audioval ) {
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parents:
diff changeset
   242
					dst_sample = min_audioval;
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parents:
diff changeset
   243
				}
74212992fb08 Initial revision
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diff changeset
   244
				dst[1] = dst_sample&0xFF;
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parents:
diff changeset
   245
				dst_sample >>= 8;
74212992fb08 Initial revision
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parents:
diff changeset
   246
				dst[0] = dst_sample&0xFF;
74212992fb08 Initial revision
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parents:
diff changeset
   247
				dst += 2;
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diff changeset
   248
			}
633
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diff changeset
   249
#endif
0
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diff changeset
   250
		}
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diff changeset
   251
		break;
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diff changeset
   252
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   253
		default: /* If this happens... FIXME! */
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diff changeset
   254
			SDL_SetError("SDL_MixAudio(): unknown audio format");
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parents:
diff changeset
   255
			return;
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diff changeset
   256
	}
74212992fb08 Initial revision
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diff changeset
   257
}
574
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diff changeset
   258