/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2006 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" /* This provides the default mixing callback for the SDL audio routines */ #include "SDL_cpuinfo.h" #include "SDL_timer.h" #include "SDL_audio.h" #include "SDL_sysaudio.h" #include "SDL_mixer_MMX.h" #include "SDL_mixer_MMX_VC.h" #include "SDL_mixer_m68k.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_MixAudioFormat(Uint8 * dst, const Uint8 * src, SDL_AudioFormat format, Uint32 len, int volume) { if (volume == 0) { return; } switch (format) { case AUDIO_U8: { #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES) SDL_MixAudio_m68k_U8((char *) dst, (char *) src, (unsigned long) len, (long) volume, (char *) mix8); #else Uint8 src_sample; while (len--) { src_sample = *src; ADJUST_VOLUME_U8(src_sample, volume); *dst = mix8[*dst + src_sample]; ++dst; ++src; } #endif } break; case AUDIO_S8: { #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES) if (SDL_HasMMX()) { SDL_MixAudio_MMX_S8((char *) dst, (char *) src, (unsigned int) len, (int) volume); } else #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES) if (SDL_HasMMX()) { SDL_MixAudio_MMX_S8_VC((char *) dst, (char *) src, (unsigned int) len, (int) volume); } else #endif #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES) SDL_MixAudio_m68k_S8((char *) dst, (char *) src, (unsigned long) len, (long) volume); #else { 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; } } #endif } break; case AUDIO_S16LSB: { #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES) if (SDL_HasMMX()) { SDL_MixAudio_MMX_S16((char *) dst, (char *) src, (unsigned int) len, (int) volume); } else #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES) if (SDL_HasMMX()) { SDL_MixAudio_MMX_S16_VC((char *) dst, (char *) src, (unsigned int) len, (int) volume); } else #endif #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES) SDL_MixAudio_m68k_S16LSB((short *) dst, (short *) src, (unsigned long) len, (long) volume); #else { 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; } } #endif } break; case AUDIO_S16MSB: { #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES) SDL_MixAudio_m68k_S16MSB((short *) dst, (short *) src, (unsigned long) len, (long) volume); #else 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; } #endif } break; case AUDIO_S32LSB: { const Uint32 *src32 = (Uint32 *) src; Uint32 *dst32 = (Uint32 *) dst; Sint64 src1, src2; Sint64 dst_sample; const Sint64 max_audioval = ((((Sint64) 1) << (32 - 1)) - 1); const Sint64 min_audioval = -(((Sint64) 1) << (32 - 1)); len /= 4; while (len--) { src1 = (Sint64) ((Sint32) SDL_SwapLE32(*src32)); src32++; ADJUST_VOLUME(src1, volume); src2 = (Sint64) ((Sint32) SDL_SwapLE32(*dst32)); dst_sample = src1 + src2; if (dst_sample > max_audioval) { dst_sample = max_audioval; } else if (dst_sample < min_audioval) { dst_sample = min_audioval; } *(dst32++) = SDL_SwapLE32((Uint32) ((Sint32) dst_sample)); } } break; case AUDIO_S32MSB: { const Uint32 *src32 = (Uint32 *) src; Uint32 *dst32 = (Uint32 *) dst; Sint64 src1, src2; Sint64 dst_sample; const Sint64 max_audioval = ((((Sint64) 1) << (32 - 1)) - 1); const Sint64 min_audioval = -(((Sint64) 1) << (32 - 1)); len /= 4; while (len--) { src1 = (Sint64) ((Sint32) SDL_SwapBE32(*src32)); src32++; ADJUST_VOLUME(src1, volume); src2 = (Sint64) ((Sint32) SDL_SwapBE32(*dst32)); dst_sample = src1 + src2; if (dst_sample > max_audioval) { dst_sample = max_audioval; } else if (dst_sample < min_audioval) { dst_sample = min_audioval; } *(dst32++) = SDL_SwapBE32((Uint32) ((Sint32) dst_sample)); } } break; case AUDIO_F32LSB: { const float fmaxvolume = 1.0f / ((float) SDL_MIX_MAXVOLUME); const float fvolume = (float) volume; const float *src32 = (float *) src; float *dst32 = (float *) dst; float src1, src2; double dst_sample; /* !!! FIXME: are these right? */ const double max_audioval = 3.402823466e+38F; const double min_audioval = -3.402823466e+38F; len /= 4; while (len--) { src1 = ((SDL_SwapFloatLE(*src32) * fvolume) * fmaxvolume); src2 = SDL_SwapFloatLE(*dst32); src32++; dst_sample = ((double) src1) + ((double) src2); if (dst_sample > max_audioval) { dst_sample = max_audioval; } else if (dst_sample < min_audioval) { dst_sample = min_audioval; } *(dst32++) = SDL_SwapFloatLE((float) dst_sample); } } break; case AUDIO_F32MSB: { const float fmaxvolume = 1.0f / ((float) SDL_MIX_MAXVOLUME); const float fvolume = (float) volume; const float *src32 = (float *) src; float *dst32 = (float *) dst; float src1, src2; double dst_sample; /* !!! FIXME: are these right? */ const double max_audioval = 3.402823466e+38F; const double min_audioval = -3.402823466e+38F; len /= 4; while (len--) { src1 = ((SDL_SwapFloatBE(*src32) * fvolume) * fmaxvolume); src2 = SDL_SwapFloatBE(*dst32); src32++; dst_sample = ((double) src1) + ((double) src2); if (dst_sample > max_audioval) { dst_sample = max_audioval; } else if (dst_sample < min_audioval) { dst_sample = min_audioval; } *(dst32++) = SDL_SwapFloatBE((float) dst_sample); } } break; default: /* If this happens... FIXME! */ SDL_SetError("SDL_MixAudio(): unknown audio format"); return; } } /* vi: set ts=4 sw=4 expandtab: */