src/audio/SDL_mixer.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 14 Jul 2006 06:40:53 +0000
changeset 1903 f132024010be
parent 1895 c121d94672cb
child 1982 3b4ce57c6215
permissions -rw-r--r--
More of the Direct3D renderer is implemented, I'm not sure why it's not showing texture copies yet...
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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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#include "SDL_config.h"
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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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    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03,
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    0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
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    0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
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    0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45,
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    0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE,
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    0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9,
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    0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4,
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    0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
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    0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA,
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    0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5,
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    0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFE, 0xFE,
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    0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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    0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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    0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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    0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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    0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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    0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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    0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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    0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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    0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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    0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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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
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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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diff changeset
    99
    }
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   100
    /* Mix the user-level audio format */
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   101
    if (current_audio) {
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   102
        if (current_audio->convert.needed) {
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   103
            format = current_audio->convert.src_format;
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diff changeset
   104
        } else {
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   105
            format = current_audio->spec.format;
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diff changeset
   106
        }
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diff changeset
   107
    } else {
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   108
        /* HACK HACK HACK */
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   109
        format = AUDIO_S16;
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diff changeset
   110
    }
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diff changeset
   111
    switch (format) {
0
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   112
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   113
    case AUDIO_U8:
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   114
        {
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   115
#if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
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   116
            SDL_MixAudio_m68k_U8((char *) dst, (char *) src,
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   117
                                 (unsigned long) len, (long) volume,
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   118
                                 (char *) mix8);
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   119
#else
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   120
            Uint8 src_sample;
0
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   121
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   122
            while (len--) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   123
                src_sample = *src;
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   124
                ADJUST_VOLUME_U8(src_sample, volume);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   125
                *dst = mix8[*dst + src_sample];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   126
                ++dst;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   127
                ++src;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   128
            }
633
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diff changeset
   129
#endif
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diff changeset
   130
        }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   131
        break;
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   132
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   133
    case AUDIO_S8:
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   134
        {
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   135
#if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   136
            if (SDL_HasMMX()) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   137
                SDL_MixAudio_MMX_S8((char *) dst, (char *) src,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   138
                                    (unsigned int) len, (int) volume);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   139
            } else
1442
e3242177fe4a Updated OS/2 build, yay!
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   140
#elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES)
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   141
            if (SDL_HasMMX()) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   142
                SDL_MixAudio_MMX_S8_VC((char *) dst, (char *) src,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   143
                                       (unsigned int) len, (int) volume);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   144
            } else
574
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   145
#endif
1402
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diff changeset
   146
#if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   147
                SDL_MixAudio_m68k_S8((char *) dst, (char *) src,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   148
                                     (unsigned long) len, (long) volume);
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diff changeset
   149
#else
1895
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   150
            {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   151
                Sint8 *dst8, *src8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   152
                Sint8 src_sample;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   153
                int dst_sample;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   154
                const int max_audioval = ((1 << (8 - 1)) - 1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   155
                const int min_audioval = -(1 << (8 - 1));
0
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diff changeset
   156
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   157
                src8 = (Sint8 *) src;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   158
                dst8 = (Sint8 *) dst;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   159
                while (len--) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   160
                    src_sample = *src8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   161
                    ADJUST_VOLUME(src_sample, volume);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   162
                    dst_sample = *dst8 + src_sample;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   163
                    if (dst_sample > max_audioval) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   164
                        *dst8 = max_audioval;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   165
                    } else if (dst_sample < min_audioval) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   166
                        *dst8 = min_audioval;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   167
                    } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   168
                        *dst8 = dst_sample;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   169
                    }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   170
                    ++dst8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   171
                    ++src8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   172
                }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   173
            }
633
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diff changeset
   174
#endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   175
        }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   176
        break;
0
74212992fb08 Initial revision
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diff changeset
   177
1895
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diff changeset
   178
    case AUDIO_S16LSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   179
        {
1402
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diff changeset
   180
#if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   181
            if (SDL_HasMMX()) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   182
                SDL_MixAudio_MMX_S16((char *) dst, (char *) src,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   183
                                     (unsigned int) len, (int) volume);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   184
            } else
1442
e3242177fe4a Updated OS/2 build, yay!
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parents: 1402
diff changeset
   185
#elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES)
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   186
            if (SDL_HasMMX()) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   187
                SDL_MixAudio_MMX_S16_VC((char *) dst, (char *) src,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   188
                                        (unsigned int) len, (int) volume);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   189
            } else
539
a9e38f3b8e4d Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   190
#endif
1402
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Sam Lantinga <slouken@libsdl.org>
parents: 1358
diff changeset
   191
#if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   192
                SDL_MixAudio_m68k_S16LSB((short *) dst, (short *) src,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   193
                                         (unsigned long) len, (long) volume);
633
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diff changeset
   194
#else
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   195
            {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   196
                Sint16 src1, src2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   197
                int dst_sample;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   198
                const int max_audioval = ((1 << (16 - 1)) - 1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   199
                const int min_audioval = -(1 << (16 - 1));
0
74212992fb08 Initial revision
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diff changeset
   200
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   201
                len /= 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   202
                while (len--) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   203
                    src1 = ((src[1]) << 8 | src[0]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   204
                    ADJUST_VOLUME(src1, volume);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   205
                    src2 = ((dst[1]) << 8 | dst[0]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   206
                    src += 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   207
                    dst_sample = src1 + src2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   208
                    if (dst_sample > max_audioval) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   209
                        dst_sample = max_audioval;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   210
                    } else if (dst_sample < min_audioval) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1442
diff changeset
   211
                        dst_sample = min_audioval;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   212
                    }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   213
                    dst[0] = dst_sample & 0xFF;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   214
                    dst_sample >>= 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1442
diff changeset
   215
                    dst[1] = dst_sample & 0xFF;
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                    dst += 2;
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                }
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            }
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#endif
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        }
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        break;
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74212992fb08 Initial revision
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    case AUDIO_S16MSB:
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        {
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#if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
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            SDL_MixAudio_m68k_S16MSB((short *) dst, (short *) src,
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                                     (unsigned long) len, (long) volume);
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#else
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            Sint16 src1, src2;
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            int dst_sample;
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            const int max_audioval = ((1 << (16 - 1)) - 1);
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            const int min_audioval = -(1 << (16 - 1));
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            len /= 2;
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            while (len--) {
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                src1 = ((src[0]) << 8 | src[1]);
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                ADJUST_VOLUME(src1, volume);
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                src2 = ((dst[0]) << 8 | dst[1]);
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                src += 2;
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                dst_sample = src1 + src2;
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                if (dst_sample > max_audioval) {
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                    dst_sample = max_audioval;
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   243
                } else if (dst_sample < min_audioval) {
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                    dst_sample = min_audioval;
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   245
                }
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                dst[1] = dst_sample & 0xFF;
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                dst_sample >>= 8;
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                dst[0] = dst_sample & 0xFF;
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                dst += 2;
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   250
            }
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#endif
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        }
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   253
        break;
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    default:                   /* If this happens... FIXME! */
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        SDL_SetError("SDL_MixAudio(): unknown audio format");
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   257
        return;
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   258
    }
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}
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/* vi: set ts=4 sw=4 expandtab: */