void SDL_MixAudio (Uint8 *dst, const 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: { #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) if (CPU_Flags() & MMX_CPU) { SDL_MixAudio_MMX_S8((char*)dst,(char*)src,(unsigned int)len,(int)volume); } else #endif #if defined(USE_ASM_MIXER_VC) if (SDL_IsMMX_VC()) { SDL_MixAudio_MMX_S8_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume); } else #endif { 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: { #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) if (CPU_Flags() & MMX_CPU) { SDL_MixAudio_MMX_S16((char*)dst,(char*)src,(unsigned int)len,(int)volume); } else #elif defined(USE_ASM_MIXER_VC) if (SDL_IsMMX_VC()) { SDL_MixAudio_MMX_S16_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume); } else #endif { 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; } }
void SDL_MixAudio (Uint8 *dst, const 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: { #if defined(__GNUC__) && defined(__M68000__) && !defined(__mcoldfire__) && 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(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */ #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 #endif #if defined(__GNUC__) && defined(__M68000__) && !defined(__mcoldfire__) && 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(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */ #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 #endif #if defined(__GNUC__) && defined(__M68000__) && !defined(__mcoldfire__) && 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(__mcoldfire__) && 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; default: /* If this happens... FIXME! */ SDL_SetError("SDL_MixAudio(): unknown audio format"); return; } }
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(__mcoldfire__) && 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(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */ #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 #endif #if defined(__GNUC__) && defined(__M68000__) && !defined(__mcoldfire__) && 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(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */ #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 #endif #if defined(__GNUC__) && defined(__M68000__) && !defined(__mcoldfire__) && 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(__mcoldfire__) && 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; } }