src/audio/SDL_mixer.c
author Ryan C. Gordon
Mon, 12 Oct 2009 08:58:12 +0000
branchSDL-1.2
changeset 4322 a8e5b518e194
parent 4159 a1b03ba2fcd0
child 4374 124629b76853
permissions -rw-r--r--
Forcibly disabled MMX mixers.

Hopefully fixes Bugzilla #649.
slouken@0
     1
/*
slouken@0
     2
    SDL - Simple DirectMedia Layer
slouken@4159
     3
    Copyright (C) 1997-2009 Sam Lantinga
slouken@0
     4
slouken@0
     5
    This library is free software; you can redistribute it and/or
slouken@1312
     6
    modify it under the terms of the GNU Lesser General Public
slouken@0
     7
    License as published by the Free Software Foundation; either
slouken@1312
     8
    version 2.1 of the License, or (at your option) any later version.
slouken@0
     9
slouken@0
    10
    This library is distributed in the hope that it will be useful,
slouken@0
    11
    but WITHOUT ANY WARRANTY; without even the implied warranty of
slouken@0
    12
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
slouken@1312
    13
    Lesser General Public License for more details.
slouken@0
    14
slouken@1312
    15
    You should have received a copy of the GNU Lesser General Public
slouken@1312
    16
    License along with this library; if not, write to the Free Software
slouken@1312
    17
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
slouken@0
    18
slouken@0
    19
    Sam Lantinga
slouken@252
    20
    slouken@libsdl.org
slouken@0
    21
*/
slouken@1402
    22
#include "SDL_config.h"
slouken@0
    23
slouken@0
    24
/* This provides the default mixing callback for the SDL audio routines */
slouken@0
    25
slouken@1358
    26
#include "SDL_cpuinfo.h"
slouken@0
    27
#include "SDL_timer.h"
slouken@1358
    28
#include "SDL_audio.h"
slouken@0
    29
#include "SDL_sysaudio.h"
slouken@539
    30
#include "SDL_mixer_MMX.h"
slouken@574
    31
#include "SDL_mixer_MMX_VC.h"
patmandin@633
    32
#include "SDL_mixer_m68k.h"
slouken@0
    33
slouken@0
    34
/* This table is used to add two sound values together and pin
slouken@0
    35
 * the value to avoid overflow.  (used with permission from ARDI)
slouken@0
    36
 * Changed to use 0xFE instead of 0xFF for better sound quality.
slouken@0
    37
 */
slouken@0
    38
static const Uint8 mix8[] =
slouken@0
    39
{
slouken@0
    40
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
slouken@0
    41
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
slouken@0
    42
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
slouken@0
    43
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
slouken@0
    44
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
slouken@0
    45
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
slouken@0
    46
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
slouken@0
    47
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
slouken@0
    48
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
slouken@0
    49
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
slouken@0
    50
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
slouken@0
    51
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03,
slouken@0
    52
  0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
slouken@0
    53
  0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
slouken@0
    54
  0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24,
slouken@0
    55
  0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
slouken@0
    56
  0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A,
slouken@0
    57
  0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45,
slouken@0
    58
  0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
slouken@0
    59
  0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B,
slouken@0
    60
  0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
slouken@0
    61
  0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71,
slouken@0
    62
  0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C,
slouken@0
    63
  0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
slouken@0
    64
  0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92,
slouken@0
    65
  0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D,
slouken@0
    66
  0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8,
slouken@0
    67
  0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3,
slouken@0
    68
  0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE,
slouken@0
    69
  0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9,
slouken@0
    70
  0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4,
slouken@0
    71
  0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
slouken@0
    72
  0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA,
slouken@0
    73
  0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5,
slouken@0
    74
  0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFE, 0xFE,
slouken@0
    75
  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
slouken@0
    76
  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
slouken@0
    77
  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
slouken@0
    78
  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
slouken@0
    79
  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
slouken@0
    80
  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
slouken@0
    81
  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
slouken@0
    82
  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
slouken@0
    83
  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
slouken@0
    84
  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
slouken@0
    85
  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
slouken@0
    86
  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE
slouken@0
    87
};
slouken@0
    88
slouken@0
    89
/* The volume ranges from 0 - 128 */
slouken@0
    90
#define ADJUST_VOLUME(s, v)	(s = (s*v)/SDL_MIX_MAXVOLUME)
slouken@0
    91
#define ADJUST_VOLUME_U8(s, v)	(s = (((s-128)*v)/SDL_MIX_MAXVOLUME)+128)
slouken@0
    92
slouken@1
    93
void SDL_MixAudio (Uint8 *dst, const Uint8 *src, Uint32 len, int volume)
slouken@0
    94
{
slouken@0
    95
	Uint16 format;
slouken@0
    96
slouken@0
    97
	if ( volume == 0 ) {
slouken@0
    98
		return;
slouken@0
    99
	}
slouken@0
   100
	/* Mix the user-level audio format */
slouken@0
   101
	if ( current_audio ) {
slouken@0
   102
		if ( current_audio->convert.needed ) {
slouken@0
   103
			format = current_audio->convert.src_format;
slouken@0
   104
		} else {
slouken@0
   105
			format = current_audio->spec.format;
slouken@0
   106
		}
slouken@0
   107
	} else {
slouken@0
   108
  		/* HACK HACK HACK */
slouken@0
   109
		format = AUDIO_S16;
slouken@0
   110
	}
slouken@0
   111
	switch (format) {
slouken@0
   112
slouken@0
   113
		case AUDIO_U8: {
slouken@1402
   114
#if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
patmandin@633
   115
			SDL_MixAudio_m68k_U8((char*)dst,(char*)src,(unsigned long)len,(long)volume,(char *)mix8);
patmandin@633
   116
#else
slouken@0
   117
			Uint8 src_sample;
slouken@0
   118
slouken@0
   119
			while ( len-- ) {
slouken@0
   120
				src_sample = *src;
slouken@0
   121
				ADJUST_VOLUME_U8(src_sample, volume);
slouken@0
   122
				*dst = mix8[*dst+src_sample];
slouken@0
   123
				++dst;
slouken@0
   124
				++src;
slouken@0
   125
			}
patmandin@633
   126
#endif
slouken@0
   127
		}
slouken@0
   128
		break;
slouken@0
   129
slouken@0
   130
		case AUDIO_S8: {
icculus@4322
   131
#if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */
slouken@1402
   132
#if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
slouken@739
   133
			if (SDL_HasMMX())
slouken@539
   134
			{
slouken@539
   135
				SDL_MixAudio_MMX_S8((char*)dst,(char*)src,(unsigned int)len,(int)volume);
slouken@539
   136
			}
slouken@539
   137
			else
slouken@1442
   138
#elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES)
slouken@746
   139
			if (SDL_HasMMX())
slouken@574
   140
			{
slouken@574
   141
				SDL_MixAudio_MMX_S8_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume);
slouken@574
   142
			}
slouken@574
   143
			else
slouken@574
   144
#endif
icculus@4322
   145
#endif
icculus@4322
   146
slouken@1402
   147
#if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
patmandin@633
   148
			SDL_MixAudio_m68k_S8((char*)dst,(char*)src,(unsigned long)len,(long)volume);
patmandin@633
   149
#else
slouken@539
   150
			{
slouken@0
   151
			Sint8 *dst8, *src8;
slouken@0
   152
			Sint8 src_sample;
slouken@0
   153
			int dst_sample;
slouken@0
   154
			const int max_audioval = ((1<<(8-1))-1);
slouken@0
   155
			const int min_audioval = -(1<<(8-1));
slouken@0
   156
slouken@0
   157
			src8 = (Sint8 *)src;
slouken@0
   158
			dst8 = (Sint8 *)dst;
slouken@0
   159
			while ( len-- ) {
slouken@0
   160
				src_sample = *src8;
slouken@0
   161
				ADJUST_VOLUME(src_sample, volume);
slouken@0
   162
				dst_sample = *dst8 + src_sample;
slouken@0
   163
				if ( dst_sample > max_audioval ) {
slouken@0
   164
					*dst8 = max_audioval;
slouken@0
   165
				} else
slouken@0
   166
				if ( dst_sample < min_audioval ) {
slouken@0
   167
					*dst8 = min_audioval;
slouken@0
   168
				} else {
slouken@0
   169
					*dst8 = dst_sample;
slouken@0
   170
				}
slouken@0
   171
				++dst8;
slouken@0
   172
				++src8;
slouken@0
   173
			}
slouken@539
   174
			}
patmandin@633
   175
#endif
slouken@0
   176
		}
slouken@0
   177
		break;
slouken@0
   178
slouken@0
   179
		case AUDIO_S16LSB: {
icculus@4322
   180
#if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */
slouken@1402
   181
#if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
slouken@739
   182
			if (SDL_HasMMX())
slouken@539
   183
			{
slouken@539
   184
				SDL_MixAudio_MMX_S16((char*)dst,(char*)src,(unsigned int)len,(int)volume);
slouken@539
   185
			}
slouken@1442
   186
                        else
slouken@1442
   187
#elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES)
slouken@746
   188
			if (SDL_HasMMX())
slouken@574
   189
			{
slouken@574
   190
				SDL_MixAudio_MMX_S16_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume);
slouken@574
   191
			}
slouken@574
   192
			else
slouken@539
   193
#endif
icculus@4322
   194
#endif
icculus@4322
   195
slouken@1402
   196
#if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
patmandin@633
   197
			SDL_MixAudio_m68k_S16LSB((short*)dst,(short*)src,(unsigned long)len,(long)volume);
patmandin@633
   198
#else
slouken@539
   199
			{
slouken@0
   200
			Sint16 src1, src2;
slouken@0
   201
			int dst_sample;
slouken@0
   202
			const int max_audioval = ((1<<(16-1))-1);
slouken@0
   203
			const int min_audioval = -(1<<(16-1));
slouken@0
   204
slouken@0
   205
			len /= 2;
slouken@0
   206
			while ( len-- ) {
slouken@0
   207
				src1 = ((src[1])<<8|src[0]);
slouken@0
   208
				ADJUST_VOLUME(src1, volume);
slouken@0
   209
				src2 = ((dst[1])<<8|dst[0]);
slouken@0
   210
				src += 2;
slouken@0
   211
				dst_sample = src1+src2;
slouken@0
   212
				if ( dst_sample > max_audioval ) {
slouken@0
   213
					dst_sample = max_audioval;
slouken@0
   214
				} else
slouken@0
   215
				if ( dst_sample < min_audioval ) {
slouken@0
   216
					dst_sample = min_audioval;
slouken@0
   217
				}
slouken@0
   218
				dst[0] = dst_sample&0xFF;
slouken@0
   219
				dst_sample >>= 8;
slouken@0
   220
				dst[1] = dst_sample&0xFF;
slouken@0
   221
				dst += 2;
slouken@0
   222
			}
slouken@539
   223
			}
patmandin@633
   224
#endif
slouken@0
   225
		}
slouken@0
   226
		break;
slouken@0
   227
slouken@0
   228
		case AUDIO_S16MSB: {
slouken@1402
   229
#if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
patmandin@633
   230
			SDL_MixAudio_m68k_S16MSB((short*)dst,(short*)src,(unsigned long)len,(long)volume);
patmandin@633
   231
#else
slouken@0
   232
			Sint16 src1, src2;
slouken@0
   233
			int dst_sample;
slouken@0
   234
			const int max_audioval = ((1<<(16-1))-1);
slouken@0
   235
			const int min_audioval = -(1<<(16-1));
slouken@0
   236
slouken@0
   237
			len /= 2;
slouken@0
   238
			while ( len-- ) {
slouken@0
   239
				src1 = ((src[0])<<8|src[1]);
slouken@0
   240
				ADJUST_VOLUME(src1, volume);
slouken@0
   241
				src2 = ((dst[0])<<8|dst[1]);
slouken@0
   242
				src += 2;
slouken@0
   243
				dst_sample = src1+src2;
slouken@0
   244
				if ( dst_sample > max_audioval ) {
slouken@0
   245
					dst_sample = max_audioval;
slouken@0
   246
				} else
slouken@0
   247
				if ( dst_sample < min_audioval ) {
slouken@0
   248
					dst_sample = min_audioval;
slouken@0
   249
				}
slouken@0
   250
				dst[1] = dst_sample&0xFF;
slouken@0
   251
				dst_sample >>= 8;
slouken@0
   252
				dst[0] = dst_sample&0xFF;
slouken@0
   253
				dst += 2;
slouken@0
   254
			}
patmandin@633
   255
#endif
slouken@0
   256
		}
slouken@0
   257
		break;
slouken@0
   258
slouken@0
   259
		default: /* If this happens... FIXME! */
slouken@0
   260
			SDL_SetError("SDL_MixAudio(): unknown audio format");
slouken@0
   261
			return;
slouken@0
   262
	}
slouken@0
   263
}
slouken@574
   264