Mercurial > sdl-ios-xcode
diff src/audio/SDL_audiocvt.c @ 1662:782fd950bd46 SDL-1.3
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid.
The code is now run through a consistent indent format:
indent -i4 -nut -nsc -br -ce
The headers are being converted to automatically generate doxygen documentation.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 28 May 2006 13:04:16 +0000 |
| parents | 14717b52abc0 |
| children | 4da1ee79c9af |
line wrap: on
line diff
--- a/src/audio/SDL_audiocvt.c Sun May 21 17:27:13 2006 +0000 +++ b/src/audio/SDL_audiocvt.c Sun May 28 13:04:16 2006 +0000 @@ -27,1519 +27,1569 @@ /* Effectively mix right and left channels into a single channel */ -void SDLCALL SDL_ConvertMono(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_ConvertMono (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Sint32 sample; + int i; + Sint32 sample; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting to mono\n"); + fprintf (stderr, "Converting to mono\n"); #endif - switch (format&0x8018) { + switch (format & 0x8018) { - case AUDIO_U8: { - Uint8 *src, *dst; + case AUDIO_U8: + { + Uint8 *src, *dst; - src = cvt->buf; - dst = cvt->buf; - for ( i=cvt->len_cvt/2; i; --i ) { - sample = src[0] + src[1]; - if ( sample > 255 ) { - *dst = 255; - } else { - *dst = (Uint8)sample; - } - src += 2; - dst += 1; - } - } - break; + src = cvt->buf; + dst = cvt->buf; + for (i = cvt->len_cvt / 2; i; --i) { + sample = src[0] + src[1]; + if (sample > 255) { + *dst = 255; + } else { + *dst = (Uint8) sample; + } + src += 2; + dst += 1; + } + } + break; - case AUDIO_S8: { - Sint8 *src, *dst; + case AUDIO_S8: + { + Sint8 *src, *dst; - src = (Sint8 *)cvt->buf; - dst = (Sint8 *)cvt->buf; - for ( i=cvt->len_cvt/2; i; --i ) { - sample = src[0] + src[1]; - if ( sample > 127 ) { - *dst = 127; - } else - if ( sample < -128 ) { - *dst = -128; - } else { - *dst = (Sint8)sample; - } - src += 2; - dst += 1; - } - } - break; + src = (Sint8 *) cvt->buf; + dst = (Sint8 *) cvt->buf; + for (i = cvt->len_cvt / 2; i; --i) { + sample = src[0] + src[1]; + if (sample > 127) { + *dst = 127; + } else if (sample < -128) { + *dst = -128; + } else { + *dst = (Sint8) sample; + } + src += 2; + dst += 1; + } + } + break; - case AUDIO_U16: { - Uint8 *src, *dst; + case AUDIO_U16: + { + Uint8 *src, *dst; - src = cvt->buf; - dst = cvt->buf; - if ( (format & 0x1000) == 0x1000 ) { - for ( i=cvt->len_cvt/4; i; --i ) { - sample = (Uint16)((src[0]<<8)|src[1])+ - (Uint16)((src[2]<<8)|src[3]); - if ( sample > 65535 ) { - dst[0] = 0xFF; - dst[1] = 0xFF; - } else { - dst[1] = (sample&0xFF); - sample >>= 8; - dst[0] = (sample&0xFF); - } - src += 4; - dst += 2; - } - } else { - for ( i=cvt->len_cvt/4; i; --i ) { - sample = (Uint16)((src[1]<<8)|src[0])+ - (Uint16)((src[3]<<8)|src[2]); - if ( sample > 65535 ) { - dst[0] = 0xFF; - dst[1] = 0xFF; - } else { - dst[0] = (sample&0xFF); - sample >>= 8; - dst[1] = (sample&0xFF); - } - src += 4; - dst += 2; - } - } - } - break; + src = cvt->buf; + dst = cvt->buf; + if ((format & 0x1000) == 0x1000) { + for (i = cvt->len_cvt / 4; i; --i) { + sample = (Uint16) ((src[0] << 8) | src[1]) + + (Uint16) ((src[2] << 8) | src[3]); + if (sample > 65535) { + dst[0] = 0xFF; + dst[1] = 0xFF; + } else { + dst[1] = (sample & 0xFF); + sample >>= 8; + dst[0] = (sample & 0xFF); + } + src += 4; + dst += 2; + } + } else { + for (i = cvt->len_cvt / 4; i; --i) { + sample = (Uint16) ((src[1] << 8) | src[0]) + + (Uint16) ((src[3] << 8) | src[2]); + if (sample > 65535) { + dst[0] = 0xFF; + dst[1] = 0xFF; + } else { + dst[0] = (sample & 0xFF); + sample >>= 8; + dst[1] = (sample & 0xFF); + } + src += 4; + dst += 2; + } + } + } + break; - case AUDIO_S16: { - Uint8 *src, *dst; + case AUDIO_S16: + { + Uint8 *src, *dst; - src = cvt->buf; - dst = cvt->buf; - if ( (format & 0x1000) == 0x1000 ) { - for ( i=cvt->len_cvt/4; i; --i ) { - sample = (Sint16)((src[0]<<8)|src[1])+ - (Sint16)((src[2]<<8)|src[3]); - if ( sample > 32767 ) { - dst[0] = 0x7F; - dst[1] = 0xFF; - } else - if ( sample < -32768 ) { - dst[0] = 0x80; - dst[1] = 0x00; - } else { - dst[1] = (sample&0xFF); - sample >>= 8; - dst[0] = (sample&0xFF); - } - src += 4; - dst += 2; - } - } else { - for ( i=cvt->len_cvt/4; i; --i ) { - sample = (Sint16)((src[1]<<8)|src[0])+ - (Sint16)((src[3]<<8)|src[2]); - if ( sample > 32767 ) { - dst[1] = 0x7F; - dst[0] = 0xFF; - } else - if ( sample < -32768 ) { - dst[1] = 0x80; - dst[0] = 0x00; - } else { - dst[0] = (sample&0xFF); - sample >>= 8; - dst[1] = (sample&0xFF); - } - src += 4; - dst += 2; - } - } - } - break; - } - cvt->len_cvt /= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf; + dst = cvt->buf; + if ((format & 0x1000) == 0x1000) { + for (i = cvt->len_cvt / 4; i; --i) { + sample = (Sint16) ((src[0] << 8) | src[1]) + + (Sint16) ((src[2] << 8) | src[3]); + if (sample > 32767) { + dst[0] = 0x7F; + dst[1] = 0xFF; + } else if (sample < -32768) { + dst[0] = 0x80; + dst[1] = 0x00; + } else { + dst[1] = (sample & 0xFF); + sample >>= 8; + dst[0] = (sample & 0xFF); + } + src += 4; + dst += 2; + } + } else { + for (i = cvt->len_cvt / 4; i; --i) { + sample = (Sint16) ((src[1] << 8) | src[0]) + + (Sint16) ((src[3] << 8) | src[2]); + if (sample > 32767) { + dst[1] = 0x7F; + dst[0] = 0xFF; + } else if (sample < -32768) { + dst[1] = 0x80; + dst[0] = 0x00; + } else { + dst[0] = (sample & 0xFF); + sample >>= 8; + dst[1] = (sample & 0xFF); + } + src += 4; + dst += 2; + } + } + } + break; + } + cvt->len_cvt /= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Discard top 4 channels */ -void SDLCALL SDL_ConvertStrip(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_ConvertStrip (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Sint32 lsample, rsample; + int i; + Sint32 lsample, rsample; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting down to stereo\n"); + fprintf (stderr, "Converting down to stereo\n"); #endif - switch (format&0x8018) { + switch (format & 0x8018) { + + case AUDIO_U8: + { + Uint8 *src, *dst; - case AUDIO_U8: { - Uint8 *src, *dst; + src = cvt->buf; + dst = cvt->buf; + for (i = cvt->len_cvt / 6; i; --i) { + dst[0] = src[0]; + dst[1] = src[1]; + src += 6; + dst += 2; + } + } + break; - src = cvt->buf; - dst = cvt->buf; - for ( i=cvt->len_cvt/6; i; --i ) { - dst[0] = src[0]; - dst[1] = src[1]; - src += 6; - dst += 2; - } - } - break; - - case AUDIO_S8: { - Sint8 *src, *dst; + case AUDIO_S8: + { + Sint8 *src, *dst; - src = (Sint8 *)cvt->buf; - dst = (Sint8 *)cvt->buf; - for ( i=cvt->len_cvt/6; i; --i ) { - dst[0] = src[0]; - dst[1] = src[1]; - src += 6; - dst += 2; - } - } - break; + src = (Sint8 *) cvt->buf; + dst = (Sint8 *) cvt->buf; + for (i = cvt->len_cvt / 6; i; --i) { + dst[0] = src[0]; + dst[1] = src[1]; + src += 6; + dst += 2; + } + } + break; - case AUDIO_U16: { - Uint8 *src, *dst; + case AUDIO_U16: + { + Uint8 *src, *dst; - src = cvt->buf; - dst = cvt->buf; - if ( (format & 0x1000) == 0x1000 ) { - for ( i=cvt->len_cvt/12; i; --i ) { - lsample = (Uint16)((src[0]<<8)|src[1]); - rsample = (Uint16)((src[2]<<8)|src[3]); - dst[1] = (lsample&0xFF); - lsample >>= 8; - dst[0] = (lsample&0xFF); - dst[3] = (rsample&0xFF); - rsample >>= 8; - dst[2] = (rsample&0xFF); - src += 12; - dst += 4; - } - } else { - for ( i=cvt->len_cvt/12; i; --i ) { - lsample = (Uint16)((src[1]<<8)|src[0]); - rsample = (Uint16)((src[3]<<8)|src[2]); - dst[0] = (lsample&0xFF); - lsample >>= 8; - dst[1] = (lsample&0xFF); - dst[2] = (rsample&0xFF); - rsample >>= 8; - dst[3] = (rsample&0xFF); - src += 12; - dst += 4; - } - } - } - break; + src = cvt->buf; + dst = cvt->buf; + if ((format & 0x1000) == 0x1000) { + for (i = cvt->len_cvt / 12; i; --i) { + lsample = (Uint16) ((src[0] << 8) | src[1]); + rsample = (Uint16) ((src[2] << 8) | src[3]); + dst[1] = (lsample & 0xFF); + lsample >>= 8; + dst[0] = (lsample & 0xFF); + dst[3] = (rsample & 0xFF); + rsample >>= 8; + dst[2] = (rsample & 0xFF); + src += 12; + dst += 4; + } + } else { + for (i = cvt->len_cvt / 12; i; --i) { + lsample = (Uint16) ((src[1] << 8) | src[0]); + rsample = (Uint16) ((src[3] << 8) | src[2]); + dst[0] = (lsample & 0xFF); + lsample >>= 8; + dst[1] = (lsample & 0xFF); + dst[2] = (rsample & 0xFF); + rsample >>= 8; + dst[3] = (rsample & 0xFF); + src += 12; + dst += 4; + } + } + } + break; - case AUDIO_S16: { - Uint8 *src, *dst; + case AUDIO_S16: + { + Uint8 *src, *dst; - src = cvt->buf; - dst = cvt->buf; - if ( (format & 0x1000) == 0x1000 ) { - for ( i=cvt->len_cvt/12; i; --i ) { - lsample = (Sint16)((src[0]<<8)|src[1]); - rsample = (Sint16)((src[2]<<8)|src[3]); - dst[1] = (lsample&0xFF); - lsample >>= 8; - dst[0] = (lsample&0xFF); - dst[3] = (rsample&0xFF); - rsample >>= 8; - dst[2] = (rsample&0xFF); - src += 12; - dst += 4; - } - } else { - for ( i=cvt->len_cvt/12; i; --i ) { - lsample = (Sint16)((src[1]<<8)|src[0]); - rsample = (Sint16)((src[3]<<8)|src[2]); - dst[0] = (lsample&0xFF); - lsample >>= 8; - dst[1] = (lsample&0xFF); - dst[2] = (rsample&0xFF); - rsample >>= 8; - dst[3] = (rsample&0xFF); - src += 12; - dst += 4; - } - } - } - break; - } - cvt->len_cvt /= 3; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf; + dst = cvt->buf; + if ((format & 0x1000) == 0x1000) { + for (i = cvt->len_cvt / 12; i; --i) { + lsample = (Sint16) ((src[0] << 8) | src[1]); + rsample = (Sint16) ((src[2] << 8) | src[3]); + dst[1] = (lsample & 0xFF); + lsample >>= 8; + dst[0] = (lsample & 0xFF); + dst[3] = (rsample & 0xFF); + rsample >>= 8; + dst[2] = (rsample & 0xFF); + src += 12; + dst += 4; + } + } else { + for (i = cvt->len_cvt / 12; i; --i) { + lsample = (Sint16) ((src[1] << 8) | src[0]); + rsample = (Sint16) ((src[3] << 8) | src[2]); + dst[0] = (lsample & 0xFF); + lsample >>= 8; + dst[1] = (lsample & 0xFF); + dst[2] = (rsample & 0xFF); + rsample >>= 8; + dst[3] = (rsample & 0xFF); + src += 12; + dst += 4; + } + } + } + break; + } + cvt->len_cvt /= 3; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Discard top 2 channels of 6 */ -void SDLCALL SDL_ConvertStrip_2(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_ConvertStrip_2 (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Sint32 lsample, rsample; + int i; + Sint32 lsample, rsample; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting 6 down to quad\n"); + fprintf (stderr, "Converting 6 down to quad\n"); #endif - switch (format&0x8018) { + switch (format & 0x8018) { + + case AUDIO_U8: + { + Uint8 *src, *dst; - case AUDIO_U8: { - Uint8 *src, *dst; + src = cvt->buf; + dst = cvt->buf; + for (i = cvt->len_cvt / 4; i; --i) { + dst[0] = src[0]; + dst[1] = src[1]; + src += 4; + dst += 2; + } + } + break; - src = cvt->buf; - dst = cvt->buf; - for ( i=cvt->len_cvt/4; i; --i ) { - dst[0] = src[0]; - dst[1] = src[1]; - src += 4; - dst += 2; - } - } - break; - - case AUDIO_S8: { - Sint8 *src, *dst; + case AUDIO_S8: + { + Sint8 *src, *dst; - src = (Sint8 *)cvt->buf; - dst = (Sint8 *)cvt->buf; - for ( i=cvt->len_cvt/4; i; --i ) { - dst[0] = src[0]; - dst[1] = src[1]; - src += 4; - dst += 2; - } - } - break; + src = (Sint8 *) cvt->buf; + dst = (Sint8 *) cvt->buf; + for (i = cvt->len_cvt / 4; i; --i) { + dst[0] = src[0]; + dst[1] = src[1]; + src += 4; + dst += 2; + } + } + break; - case AUDIO_U16: { - Uint8 *src, *dst; + case AUDIO_U16: + { + Uint8 *src, *dst; - src = cvt->buf; - dst = cvt->buf; - if ( (format & 0x1000) == 0x1000 ) { - for ( i=cvt->len_cvt/8; i; --i ) { - lsample = (Uint16)((src[0]<<8)|src[1]); - rsample = (Uint16)((src[2]<<8)|src[3]); - dst[1] = (lsample&0xFF); - lsample >>= 8; - dst[0] = (lsample&0xFF); - dst[3] = (rsample&0xFF); - rsample >>= 8; - dst[2] = (rsample&0xFF); - src += 8; - dst += 4; - } - } else { - for ( i=cvt->len_cvt/8; i; --i ) { - lsample = (Uint16)((src[1]<<8)|src[0]); - rsample = (Uint16)((src[3]<<8)|src[2]); - dst[0] = (lsample&0xFF); - lsample >>= 8; - dst[1] = (lsample&0xFF); - dst[2] = (rsample&0xFF); - rsample >>= 8; - dst[3] = (rsample&0xFF); - src += 8; - dst += 4; - } - } - } - break; + src = cvt->buf; + dst = cvt->buf; + if ((format & 0x1000) == 0x1000) { + for (i = cvt->len_cvt / 8; i; --i) { + lsample = (Uint16) ((src[0] << 8) | src[1]); + rsample = (Uint16) ((src[2] << 8) | src[3]); + dst[1] = (lsample & 0xFF); + lsample >>= 8; + dst[0] = (lsample & 0xFF); + dst[3] = (rsample & 0xFF); + rsample >>= 8; + dst[2] = (rsample & 0xFF); + src += 8; + dst += 4; + } + } else { + for (i = cvt->len_cvt / 8; i; --i) { + lsample = (Uint16) ((src[1] << 8) | src[0]); + rsample = (Uint16) ((src[3] << 8) | src[2]); + dst[0] = (lsample & 0xFF); + lsample >>= 8; + dst[1] = (lsample & 0xFF); + dst[2] = (rsample & 0xFF); + rsample >>= 8; + dst[3] = (rsample & 0xFF); + src += 8; + dst += 4; + } + } + } + break; - case AUDIO_S16: { - Uint8 *src, *dst; + case AUDIO_S16: + { + Uint8 *src, *dst; - src = cvt->buf; - dst = cvt->buf; - if ( (format & 0x1000) == 0x1000 ) { - for ( i=cvt->len_cvt/8; i; --i ) { - lsample = (Sint16)((src[0]<<8)|src[1]); - rsample = (Sint16)((src[2]<<8)|src[3]); - dst[1] = (lsample&0xFF); - lsample >>= 8; - dst[0] = (lsample&0xFF); - dst[3] = (rsample&0xFF); - rsample >>= 8; - dst[2] = (rsample&0xFF); - src += 8; - dst += 4; - } - } else { - for ( i=cvt->len_cvt/8; i; --i ) { - lsample = (Sint16)((src[1]<<8)|src[0]); - rsample = (Sint16)((src[3]<<8)|src[2]); - dst[0] = (lsample&0xFF); - lsample >>= 8; - dst[1] = (lsample&0xFF); - dst[2] = (rsample&0xFF); - rsample >>= 8; - dst[3] = (rsample&0xFF); - src += 8; - dst += 4; - } - } - } - break; - } - cvt->len_cvt /= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf; + dst = cvt->buf; + if ((format & 0x1000) == 0x1000) { + for (i = cvt->len_cvt / 8; i; --i) { + lsample = (Sint16) ((src[0] << 8) | src[1]); + rsample = (Sint16) ((src[2] << 8) | src[3]); + dst[1] = (lsample & 0xFF); + lsample >>= 8; + dst[0] = (lsample & 0xFF); + dst[3] = (rsample & 0xFF); + rsample >>= 8; + dst[2] = (rsample & 0xFF); + src += 8; + dst += 4; + } + } else { + for (i = cvt->len_cvt / 8; i; --i) { + lsample = (Sint16) ((src[1] << 8) | src[0]); + rsample = (Sint16) ((src[3] << 8) | src[2]); + dst[0] = (lsample & 0xFF); + lsample >>= 8; + dst[1] = (lsample & 0xFF); + dst[2] = (rsample & 0xFF); + rsample >>= 8; + dst[3] = (rsample & 0xFF); + src += 8; + dst += 4; + } + } + } + break; + } + cvt->len_cvt /= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Duplicate a mono channel to both stereo channels */ -void SDLCALL SDL_ConvertStereo(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_ConvertStereo (SDL_AudioCVT * cvt, Uint16 format) { - int i; + int i; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting to stereo\n"); + fprintf (stderr, "Converting to stereo\n"); #endif - if ( (format & 0xFF) == 16 ) { - Uint16 *src, *dst; + if ((format & 0xFF) == 16) { + Uint16 *src, *dst; - src = (Uint16 *)(cvt->buf+cvt->len_cvt); - dst = (Uint16 *)(cvt->buf+cvt->len_cvt*2); - for ( i=cvt->len_cvt/2; i; --i ) { - dst -= 2; - src -= 1; - dst[0] = src[0]; - dst[1] = src[0]; - } - } else { - Uint8 *src, *dst; + src = (Uint16 *) (cvt->buf + cvt->len_cvt); + dst = (Uint16 *) (cvt->buf + cvt->len_cvt * 2); + for (i = cvt->len_cvt / 2; i; --i) { + dst -= 2; + src -= 1; + dst[0] = src[0]; + dst[1] = src[0]; + } + } else { + Uint8 *src, *dst; - src = cvt->buf+cvt->len_cvt; - dst = cvt->buf+cvt->len_cvt*2; - for ( i=cvt->len_cvt; i; --i ) { - dst -= 2; - src -= 1; - dst[0] = src[0]; - dst[1] = src[0]; - } - } - cvt->len_cvt *= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf + cvt->len_cvt; + dst = cvt->buf + cvt->len_cvt * 2; + for (i = cvt->len_cvt; i; --i) { + dst -= 2; + src -= 1; + dst[0] = src[0]; + dst[1] = src[0]; + } + } + cvt->len_cvt *= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Duplicate a stereo channel to a pseudo-5.1 stream */ -void SDLCALL SDL_ConvertSurround(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_ConvertSurround (SDL_AudioCVT * cvt, Uint16 format) { - int i; + int i; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting stereo to surround\n"); + fprintf (stderr, "Converting stereo to surround\n"); #endif - switch (format&0x8018) { + switch (format & 0x8018) { - case AUDIO_U8: { - Uint8 *src, *dst, lf, rf, ce; + case AUDIO_U8: + { + Uint8 *src, *dst, lf, rf, ce; - src = (Uint8 *)(cvt->buf+cvt->len_cvt); - dst = (Uint8 *)(cvt->buf+cvt->len_cvt*3); - for ( i=cvt->len_cvt; i; --i ) { - dst -= 6; - src -= 2; - lf = src[0]; - rf = src[1]; - ce = (lf/2) + (rf/2); - dst[0] = lf; - dst[1] = rf; - dst[2] = lf - ce; - dst[3] = rf - ce; - dst[4] = ce; - dst[5] = ce; - } - } - break; + src = (Uint8 *) (cvt->buf + cvt->len_cvt); + dst = (Uint8 *) (cvt->buf + cvt->len_cvt * 3); + for (i = cvt->len_cvt; i; --i) { + dst -= 6; + src -= 2; + lf = src[0]; + rf = src[1]; + ce = (lf / 2) + (rf / 2); + dst[0] = lf; + dst[1] = rf; + dst[2] = lf - ce; + dst[3] = rf - ce; + dst[4] = ce; + dst[5] = ce; + } + } + break; - case AUDIO_S8: { - Sint8 *src, *dst, lf, rf, ce; + case AUDIO_S8: + { + Sint8 *src, *dst, lf, rf, ce; - src = (Sint8 *)cvt->buf+cvt->len_cvt; - dst = (Sint8 *)cvt->buf+cvt->len_cvt*3; - for ( i=cvt->len_cvt; i; --i ) { - dst -= 6; - src -= 2; - lf = src[0]; - rf = src[1]; - ce = (lf/2) + (rf/2); - dst[0] = lf; - dst[1] = rf; - dst[2] = lf - ce; - dst[3] = rf - ce; - dst[4] = ce; - dst[5] = ce; - } - } - break; - - case AUDIO_U16: { - Uint8 *src, *dst; - Uint16 lf, rf, ce, lr, rr; + src = (Sint8 *) cvt->buf + cvt->len_cvt; + dst = (Sint8 *) cvt->buf + cvt->len_cvt * 3; + for (i = cvt->len_cvt; i; --i) { + dst -= 6; + src -= 2; + lf = src[0]; + rf = src[1]; + ce = (lf / 2) + (rf / 2); + dst[0] = lf; + dst[1] = rf; + dst[2] = lf - ce; + dst[3] = rf - ce; + dst[4] = ce; + dst[5] = ce; + } + } + break; - src = cvt->buf+cvt->len_cvt; - dst = cvt->buf+cvt->len_cvt*3; + case AUDIO_U16: + { + Uint8 *src, *dst; + Uint16 lf, rf, ce, lr, rr; + + src = cvt->buf + cvt->len_cvt; + dst = cvt->buf + cvt->len_cvt * 3; - if ( (format & 0x1000) == 0x1000 ) { - for ( i=cvt->len_cvt/4; i; --i ) { - dst -= 12; - src -= 4; - lf = (Uint16)((src[0]<<8)|src[1]); - rf = (Uint16)((src[2]<<8)|src[3]); - ce = (lf/2) + (rf/2); - rr = lf - ce; - lr = rf - ce; - dst[1] = (lf&0xFF); - dst[0] = ((lf>>8)&0xFF); - dst[3] = (rf&0xFF); - dst[2] = ((rf>>8)&0xFF); + if ((format & 0x1000) == 0x1000) { + for (i = cvt->len_cvt / 4; i; --i) { + dst -= 12; + src -= 4; + lf = (Uint16) ((src[0] << 8) | src[1]); + rf = (Uint16) ((src[2] << 8) | src[3]); + ce = (lf / 2) + (rf / 2); + rr = lf - ce; + lr = rf - ce; + dst[1] = (lf & 0xFF); + dst[0] = ((lf >> 8) & 0xFF); + dst[3] = (rf & 0xFF); + dst[2] = ((rf >> 8) & 0xFF); - dst[1+4] = (lr&0xFF); - dst[0+4] = ((lr>>8)&0xFF); - dst[3+4] = (rr&0xFF); - dst[2+4] = ((rr>>8)&0xFF); + dst[1 + 4] = (lr & 0xFF); + dst[0 + 4] = ((lr >> 8) & 0xFF); + dst[3 + 4] = (rr & 0xFF); + dst[2 + 4] = ((rr >> 8) & 0xFF); - dst[1+8] = (ce&0xFF); - dst[0+8] = ((ce>>8)&0xFF); - dst[3+8] = (ce&0xFF); - dst[2+8] = ((ce>>8)&0xFF); - } - } else { - for ( i=cvt->len_cvt/4; i; --i ) { - dst -= 12; - src -= 4; - lf = (Uint16)((src[1]<<8)|src[0]); - rf = (Uint16)((src[3]<<8)|src[2]); - ce = (lf/2) + (rf/2); - rr = lf - ce; - lr = rf - ce; - dst[0] = (lf&0xFF); - dst[1] = ((lf>>8)&0xFF); - dst[2] = (rf&0xFF); - dst[3] = ((rf>>8)&0xFF); + dst[1 + 8] = (ce & 0xFF); + dst[0 + 8] = ((ce >> 8) & 0xFF); + dst[3 + 8] = (ce & 0xFF); + dst[2 + 8] = ((ce >> 8) & 0xFF); + } + } else { + for (i = cvt->len_cvt / 4; i; --i) { + dst -= 12; + src -= 4; + lf = (Uint16) ((src[1] << 8) | src[0]); + rf = (Uint16) ((src[3] << 8) | src[2]); + ce = (lf / 2) + (rf / 2); + rr = lf - ce; + lr = rf - ce; + dst[0] = (lf & 0xFF); + dst[1] = ((lf >> 8) & 0xFF); + dst[2] = (rf & 0xFF); + dst[3] = ((rf >> 8) & 0xFF); - dst[0+4] = (lr&0xFF); - dst[1+4] = ((lr>>8)&0xFF); - dst[2+4] = (rr&0xFF); - dst[3+4] = ((rr>>8)&0xFF); + dst[0 + 4] = (lr & 0xFF); + dst[1 + 4] = ((lr >> 8) & 0xFF); + dst[2 + 4] = (rr & 0xFF); + dst[3 + 4] = ((rr >> 8) & 0xFF); - dst[0+8] = (ce&0xFF); - dst[1+8] = ((ce>>8)&0xFF); - dst[2+8] = (ce&0xFF); - dst[3+8] = ((ce>>8)&0xFF); - } - } - } - break; + dst[0 + 8] = (ce & 0xFF); + dst[1 + 8] = ((ce >> 8) & 0xFF); + dst[2 + 8] = (ce & 0xFF); + dst[3 + 8] = ((ce >> 8) & 0xFF); + } + } + } + break; - case AUDIO_S16: { - Uint8 *src, *dst; - Sint16 lf, rf, ce, lr, rr; + case AUDIO_S16: + { + Uint8 *src, *dst; + Sint16 lf, rf, ce, lr, rr; - src = cvt->buf+cvt->len_cvt; - dst = cvt->buf+cvt->len_cvt*3; + src = cvt->buf + cvt->len_cvt; + dst = cvt->buf + cvt->len_cvt * 3; - if ( (format & 0x1000) == 0x1000 ) { - for ( i=cvt->len_cvt/4; i; --i ) { - dst -= 12; - src -= 4; - lf = (Sint16)((src[0]<<8)|src[1]); - rf = (Sint16)((src[2]<<8)|src[3]); - ce = (lf/2) + (rf/2); - rr = lf - ce; - lr = rf - ce; - dst[1] = (lf&0xFF); - dst[0] = ((lf>>8)&0xFF); - dst[3] = (rf&0xFF); - dst[2] = ((rf>>8)&0xFF); + if ((format & 0x1000) == 0x1000) { + for (i = cvt->len_cvt / 4; i; --i) { + dst -= 12; + src -= 4; + lf = (Sint16) ((src[0] << 8) | src[1]); + rf = (Sint16) ((src[2] << 8) | src[3]); + ce = (lf / 2) + (rf / 2); + rr = lf - ce; + lr = rf - ce; + dst[1] = (lf & 0xFF); + dst[0] = ((lf >> 8) & 0xFF); + dst[3] = (rf & 0xFF); + dst[2] = ((rf >> 8) & 0xFF); - dst[1+4] = (lr&0xFF); - dst[0+4] = ((lr>>8)&0xFF); - dst[3+4] = (rr&0xFF); - dst[2+4] = ((rr>>8)&0xFF); + dst[1 + 4] = (lr & 0xFF); + dst[0 + 4] = ((lr >> 8) & 0xFF); + dst[3 + 4] = (rr & 0xFF); + dst[2 + 4] = ((rr >> 8) & 0xFF); - dst[1+8] = (ce&0xFF); - dst[0+8] = ((ce>>8)&0xFF); - dst[3+8] = (ce&0xFF); - dst[2+8] = ((ce>>8)&0xFF); - } - } else { - for ( i=cvt->len_cvt/4; i; --i ) { - dst -= 12; - src -= 4; - lf = (Sint16)((src[1]<<8)|src[0]); - rf = (Sint16)((src[3]<<8)|src[2]); - ce = (lf/2) + (rf/2); - rr = lf - ce; - lr = rf - ce; - dst[0] = (lf&0xFF); - dst[1] = ((lf>>8)&0xFF); - dst[2] = (rf&0xFF); - dst[3] = ((rf>>8)&0xFF); + dst[1 + 8] = (ce & 0xFF); + dst[0 + 8] = ((ce >> 8) & 0xFF); + dst[3 + 8] = (ce & 0xFF); + dst[2 + 8] = ((ce >> 8) & 0xFF); + } + } else { + for (i = cvt->len_cvt / 4; i; --i) { + dst -= 12; + src -= 4; + lf = (Sint16) ((src[1] << 8) | src[0]); + rf = (Sint16) ((src[3] << 8) | src[2]); + ce = (lf / 2) + (rf / 2); + rr = lf - ce; + lr = rf - ce; + dst[0] = (lf & 0xFF); + dst[1] = ((lf >> 8) & 0xFF); + dst[2] = (rf & 0xFF); + dst[3] = ((rf >> 8) & 0xFF); - dst[0+4] = (lr&0xFF); - dst[1+4] = ((lr>>8)&0xFF); - dst[2+4] = (rr&0xFF); - dst[3+4] = ((rr>>8)&0xFF); + dst[0 + 4] = (lr & 0xFF); + dst[1 + 4] = ((lr >> 8) & 0xFF); + dst[2 + 4] = (rr & 0xFF); + dst[3 + 4] = ((rr >> 8) & 0xFF); - dst[0+8] = (ce&0xFF); - dst[1+8] = ((ce>>8)&0xFF); - dst[2+8] = (ce&0xFF); - dst[3+8] = ((ce>>8)&0xFF); - } - } - } - break; - } - cvt->len_cvt *= 3; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + dst[0 + 8] = (ce & 0xFF); + dst[1 + 8] = ((ce >> 8) & 0xFF); + dst[2 + 8] = (ce & 0xFF); + dst[3 + 8] = ((ce >> 8) & 0xFF); + } + } + } + break; + } + cvt->len_cvt *= 3; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Duplicate a stereo channel to a pseudo-4.0 stream */ -void SDLCALL SDL_ConvertSurround_4(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_ConvertSurround_4 (SDL_AudioCVT * cvt, Uint16 format) { - int i; + int i; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting stereo to quad\n"); + fprintf (stderr, "Converting stereo to quad\n"); #endif - switch (format&0x8018) { + switch (format & 0x8018) { - case AUDIO_U8: { - Uint8 *src, *dst, lf, rf, ce; + case AUDIO_U8: + { + Uint8 *src, *dst, lf, rf, ce; - src = (Uint8 *)(cvt->buf+cvt->len_cvt); - dst = (Uint8 *)(cvt->buf+cvt->len_cvt*2); - for ( i=cvt->len_cvt; i; --i ) { - dst -= 4; - src -= 2; - lf = src[0]; - rf = src[1]; - ce = (lf/2) + (rf/2); - dst[0] = lf; - dst[1] = rf; - dst[2] = lf - ce; - dst[3] = rf - ce; - } - } - break; + src = (Uint8 *) (cvt->buf + cvt->len_cvt); + dst = (Uint8 *) (cvt->buf + cvt->len_cvt * 2); + for (i = cvt->len_cvt; i; --i) { + dst -= 4; + src -= 2; + lf = src[0]; + rf = src[1]; + ce = (lf / 2) + (rf / 2); + dst[0] = lf; + dst[1] = rf; + dst[2] = lf - ce; + dst[3] = rf - ce; + } + } + break; - case AUDIO_S8: { - Sint8 *src, *dst, lf, rf, ce; + case AUDIO_S8: + { + Sint8 *src, *dst, lf, rf, ce; - src = (Sint8 *)cvt->buf+cvt->len_cvt; - dst = (Sint8 *)cvt->buf+cvt->len_cvt*2; - for ( i=cvt->len_cvt; i; --i ) { - dst -= 4; - src -= 2; - lf = src[0]; - rf = src[1]; - ce = (lf/2) + (rf/2); - dst[0] = lf; - dst[1] = rf; - dst[2] = lf - ce; - dst[3] = rf - ce; - } - } - break; + src = (Sint8 *) cvt->buf + cvt->len_cvt; + dst = (Sint8 *) cvt->buf + cvt->len_cvt * 2; + for (i = cvt->len_cvt; i; --i) { + dst -= 4; + src -= 2; + lf = src[0]; + rf = src[1]; + ce = (lf / 2) + (rf / 2); + dst[0] = lf; + dst[1] = rf; + dst[2] = lf - ce; + dst[3] = rf - ce; + } + } + break; - case AUDIO_U16: { - Uint8 *src, *dst; - Uint16 lf, rf, ce, lr, rr; + case AUDIO_U16: + { + Uint8 *src, *dst; + Uint16 lf, rf, ce, lr, rr; - src = cvt->buf+cvt->len_cvt; - dst = cvt->buf+cvt->len_cvt*2; + src = cvt->buf + cvt->len_cvt; + dst = cvt->buf + cvt->len_cvt * 2; - if ( (format & 0x1000) == 0x1000 ) { - for ( i=cvt->len_cvt/4; i; --i ) { - dst -= 8; - src -= 4; - lf = (Uint16)((src[0]<<8)|src[1]); - rf = (Uint16)((src[2]<<8)|src[3]); - ce = (lf/2) + (rf/2); - rr = lf - ce; - lr = rf - ce; - dst[1] = (lf&0xFF); - dst[0] = ((lf>>8)&0xFF); - dst[3] = (rf&0xFF); - dst[2] = ((rf>>8)&0xFF); + if ((format & 0x1000) == 0x1000) { + for (i = cvt->len_cvt / 4; i; --i) { + dst -= 8; + src -= 4; + lf = (Uint16) ((src[0] << 8) | src[1]); + rf = (Uint16) ((src[2] << 8) | src[3]); + ce = (lf / 2) + (rf / 2); + rr = lf - ce; + lr = rf - ce; + dst[1] = (lf & 0xFF); + dst[0] = ((lf >> 8) & 0xFF); + dst[3] = (rf & 0xFF); + dst[2] = ((rf >> 8) & 0xFF); - dst[1+4] = (lr&0xFF); - dst[0+4] = ((lr>>8)&0xFF); - dst[3+4] = (rr&0xFF); - dst[2+4] = ((rr>>8)&0xFF); - } - } else { - for ( i=cvt->len_cvt/4; i; --i ) { - dst -= 8; - src -= 4; - lf = (Uint16)((src[1]<<8)|src[0]); - rf = (Uint16)((src[3]<<8)|src[2]); - ce = (lf/2) + (rf/2); - rr = lf - ce; - lr = rf - ce; - dst[0] = (lf&0xFF); - dst[1] = ((lf>>8)&0xFF); - dst[2] = (rf&0xFF); - dst[3] = ((rf>>8)&0xFF); + dst[1 + 4] = (lr & 0xFF); + dst[0 + 4] = ((lr >> 8) & 0xFF); + dst[3 + 4] = (rr & 0xFF); + dst[2 + 4] = ((rr >> 8) & 0xFF); + } + } else { + for (i = cvt->len_cvt / 4; i; --i) { + dst -= 8; + src -= 4; + lf = (Uint16) ((src[1] << 8) | src[0]); + rf = (Uint16) ((src[3] << 8) | src[2]); + ce = (lf / 2) + (rf / 2); + rr = lf - ce; + lr = rf - ce; + dst[0] = (lf & 0xFF); + dst[1] = ((lf >> 8) & 0xFF); + dst[2] = (rf & 0xFF); + dst[3] = ((rf >> 8) & 0xFF); - dst[0+4] = (lr&0xFF); - dst[1+4] = ((lr>>8)&0xFF); - dst[2+4] = (rr&0xFF); - dst[3+4] = ((rr>>8)&0xFF); - } - } - } - break; + dst[0 + 4] = (lr & 0xFF); + dst[1 + 4] = ((lr >> 8) & 0xFF); + dst[2 + 4] = (rr & 0xFF); + dst[3 + 4] = ((rr >> 8) & 0xFF); + } + } + } + break; - case AUDIO_S16: { - Uint8 *src, *dst; - Sint16 lf, rf, ce, lr, rr; + case AUDIO_S16: + { + Uint8 *src, *dst; + Sint16 lf, rf, ce, lr, rr; - src = cvt->buf+cvt->len_cvt; - dst = cvt->buf+cvt->len_cvt*2; + src = cvt->buf + cvt->len_cvt; + dst = cvt->buf + cvt->len_cvt * 2; - if ( (format & 0x1000) == 0x1000 ) { - for ( i=cvt->len_cvt/4; i; --i ) { - dst -= 8; - src -= 4; - lf = (Sint16)((src[0]<<8)|src[1]); - rf = (Sint16)((src[2]<<8)|src[3]); - ce = (lf/2) + (rf/2); - rr = lf - ce; - lr = rf - ce; - dst[1] = (lf&0xFF); - dst[0] = ((lf>>8)&0xFF); - dst[3] = (rf&0xFF); - dst[2] = ((rf>>8)&0xFF); + if ((format & 0x1000) == 0x1000) { + for (i = cvt->len_cvt / 4; i; --i) { + dst -= 8; + src -= 4; + lf = (Sint16) ((src[0] << 8) | src[1]); + rf = (Sint16) ((src[2] << 8) | src[3]); + ce = (lf / 2) + (rf / 2); + rr = lf - ce; + lr = rf - ce; + dst[1] = (lf & 0xFF); + dst[0] = ((lf >> 8) & 0xFF); + dst[3] = (rf & 0xFF); + dst[2] = ((rf >> 8) & 0xFF); - dst[1+4] = (lr&0xFF); - dst[0+4] = ((lr>>8)&0xFF); - dst[3+4] = (rr&0xFF); - dst[2+4] = ((rr>>8)&0xFF); - } - } else { - for ( i=cvt->len_cvt/4; i; --i ) { - dst -= 8; - src -= 4; - lf = (Sint16)((src[1]<<8)|src[0]); - rf = (Sint16)((src[3]<<8)|src[2]); - ce = (lf/2) + (rf/2); - rr = lf - ce; - lr = rf - ce; - dst[0] = (lf&0xFF); - dst[1] = ((lf>>8)&0xFF); - dst[2] = (rf&0xFF); - dst[3] = ((rf>>8)&0xFF); + dst[1 + 4] = (lr & 0xFF); + dst[0 + 4] = ((lr >> 8) & 0xFF); + dst[3 + 4] = (rr & 0xFF); + dst[2 + 4] = ((rr >> 8) & 0xFF); + } + } else { + for (i = cvt->len_cvt / 4; i; --i) { + dst -= 8; + src -= 4; + lf = (Sint16) ((src[1] << 8) | src[0]); + rf = (Sint16) ((src[3] << 8) | src[2]); + ce = (lf / 2) + (rf / 2); + rr = lf - ce; + lr = rf - ce; + dst[0] = (lf & 0xFF); + dst[1] = ((lf >> 8) & 0xFF); + dst[2] = (rf & 0xFF); + dst[3] = ((rf >> 8) & 0xFF); - dst[0+4] = (lr&0xFF); - dst[1+4] = ((lr>>8)&0xFF); - dst[2+4] = (rr&0xFF); - dst[3+4] = ((rr>>8)&0xFF); - } - } - } - break; - } - cvt->len_cvt *= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + dst[0 + 4] = (lr & 0xFF); + dst[1 + 4] = ((lr >> 8) & 0xFF); + dst[2 + 4] = (rr & 0xFF); + dst[3 + 4] = ((rr >> 8) & 0xFF); + } + } + } + break; + } + cvt->len_cvt *= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Convert 8-bit to 16-bit - LSB */ -void SDLCALL SDL_Convert16LSB(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_Convert16LSB (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Uint8 *src, *dst; + int i; + Uint8 *src, *dst; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting to 16-bit LSB\n"); + fprintf (stderr, "Converting to 16-bit LSB\n"); #endif - src = cvt->buf+cvt->len_cvt; - dst = cvt->buf+cvt->len_cvt*2; - for ( i=cvt->len_cvt; i; --i ) { - src -= 1; - dst -= 2; - dst[1] = *src; - dst[0] = 0; - } - format = ((format & ~0x0008) | AUDIO_U16LSB); - cvt->len_cvt *= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf + cvt->len_cvt; + dst = cvt->buf + cvt->len_cvt * 2; + for (i = cvt->len_cvt; i; --i) { + src -= 1; + dst -= 2; + dst[1] = *src; + dst[0] = 0; + } + format = ((format & ~0x0008) | AUDIO_U16LSB); + cvt->len_cvt *= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } + /* Convert 8-bit to 16-bit - MSB */ -void SDLCALL SDL_Convert16MSB(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_Convert16MSB (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Uint8 *src, *dst; + int i; + Uint8 *src, *dst; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting to 16-bit MSB\n"); + fprintf (stderr, "Converting to 16-bit MSB\n"); #endif - src = cvt->buf+cvt->len_cvt; - dst = cvt->buf+cvt->len_cvt*2; - for ( i=cvt->len_cvt; i; --i ) { - src -= 1; - dst -= 2; - dst[0] = *src; - dst[1] = 0; - } - format = ((format & ~0x0008) | AUDIO_U16MSB); - cvt->len_cvt *= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf + cvt->len_cvt; + dst = cvt->buf + cvt->len_cvt * 2; + for (i = cvt->len_cvt; i; --i) { + src -= 1; + dst -= 2; + dst[0] = *src; + dst[1] = 0; + } + format = ((format & ~0x0008) | AUDIO_U16MSB); + cvt->len_cvt *= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Convert 16-bit to 8-bit */ -void SDLCALL SDL_Convert8(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_Convert8 (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Uint8 *src, *dst; + int i; + Uint8 *src, *dst; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting to 8-bit\n"); + fprintf (stderr, "Converting to 8-bit\n"); #endif - src = cvt->buf; - dst = cvt->buf; - if ( (format & 0x1000) != 0x1000 ) { /* Little endian */ - ++src; - } - for ( i=cvt->len_cvt/2; i; --i ) { - *dst = *src; - src += 2; - dst += 1; - } - format = ((format & ~0x9010) | AUDIO_U8); - cvt->len_cvt /= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf; + dst = cvt->buf; + if ((format & 0x1000) != 0x1000) { /* Little endian */ + ++src; + } + for (i = cvt->len_cvt / 2; i; --i) { + *dst = *src; + src += 2; + dst += 1; + } + format = ((format & ~0x9010) | AUDIO_U8); + cvt->len_cvt /= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Toggle signed/unsigned */ -void SDLCALL SDL_ConvertSign(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_ConvertSign (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Uint8 *data; + int i; + Uint8 *data; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting audio signedness\n"); + fprintf (stderr, "Converting audio signedness\n"); #endif - data = cvt->buf; - if ( (format & 0xFF) == 16 ) { - if ( (format & 0x1000) != 0x1000 ) { /* Little endian */ - ++data; - } - for ( i=cvt->len_cvt/2; i; --i ) { - *data ^= 0x80; - data += 2; - } - } else { - for ( i=cvt->len_cvt; i; --i ) { - *data++ ^= 0x80; - } - } - format = (format ^ 0x8000); - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + data = cvt->buf; + if ((format & 0xFF) == 16) { + if ((format & 0x1000) != 0x1000) { /* Little endian */ + ++data; + } + for (i = cvt->len_cvt / 2; i; --i) { + *data ^= 0x80; + data += 2; + } + } else { + for (i = cvt->len_cvt; i; --i) { + *data++ ^= 0x80; + } + } + format = (format ^ 0x8000); + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Toggle endianness */ -void SDLCALL SDL_ConvertEndian(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_ConvertEndian (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Uint8 *data, tmp; + int i; + Uint8 *data, tmp; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting audio endianness\n"); + fprintf (stderr, "Converting audio endianness\n"); #endif - data = cvt->buf; - for ( i=cvt->len_cvt/2; i; --i ) { - tmp = data[0]; - data[0] = data[1]; - data[1] = tmp; - data += 2; - } - format = (format ^ 0x1000); - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + data = cvt->buf; + for (i = cvt->len_cvt / 2; i; --i) { + tmp = data[0]; + data[0] = data[1]; + data[1] = tmp; + data += 2; + } + format = (format ^ 0x1000); + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Convert rate up by multiple of 2 */ -void SDLCALL SDL_RateMUL2(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_RateMUL2 (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Uint8 *src, *dst; + int i; + Uint8 *src, *dst; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting audio rate * 2\n"); + fprintf (stderr, "Converting audio rate * 2\n"); #endif - src = cvt->buf+cvt->len_cvt; - dst = cvt->buf+cvt->len_cvt*2; - switch (format & 0xFF) { - case 8: - for ( i=cvt->len_cvt; i; --i ) { - src -= 1; - dst -= 2; - dst[0] = src[0]; - dst[1] = src[0]; - } - break; - case 16: - for ( i=cvt->len_cvt/2; i; --i ) { - src -= 2; - dst -= 4; - dst[0] = src[0]; - dst[1] = src[1]; - dst[2] = src[0]; - dst[3] = src[1]; - } - break; - } - cvt->len_cvt *= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf + cvt->len_cvt; + dst = cvt->buf + cvt->len_cvt * 2; + switch (format & 0xFF) { + case 8: + for (i = cvt->len_cvt; i; --i) { + src -= 1; + dst -= 2; + dst[0] = src[0]; + dst[1] = src[0]; + } + break; + case 16: + for (i = cvt->len_cvt / 2; i; --i) { + src -= 2; + dst -= 4; + dst[0] = src[0]; + dst[1] = src[1]; + dst[2] = src[0]; + dst[3] = src[1]; + } + break; + } + cvt->len_cvt *= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Convert rate up by multiple of 2, for stereo */ -void SDLCALL SDL_RateMUL2_c2(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_RateMUL2_c2 (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Uint8 *src, *dst; + int i; + Uint8 *src, *dst; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting audio rate * 2\n"); + fprintf (stderr, "Converting audio rate * 2\n"); #endif - src = cvt->buf+cvt->len_cvt; - dst = cvt->buf+cvt->len_cvt*2; - switch (format & 0xFF) { - case 8: - for ( i=cvt->len_cvt/2; i; --i ) { - src -= 2; - dst -= 4; - dst[0] = src[0]; - dst[1] = src[1]; - dst[2] = src[0]; - dst[3] = src[1]; - } - break; - case 16: - for ( i=cvt->len_cvt/4; i; --i ) { - src -= 4; - dst -= 8; - dst[0] = src[0]; - dst[1] = src[1]; - dst[2] = src[2]; - dst[3] = src[3]; - dst[4] = src[0]; - dst[5] = src[1]; - dst[6] = src[2]; - dst[7] = src[3]; - } - break; - } - cvt->len_cvt *= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf + cvt->len_cvt; + dst = cvt->buf + cvt->len_cvt * 2; + switch (format & 0xFF) { + case 8: + for (i = cvt->len_cvt / 2; i; --i) { + src -= 2; + dst -= 4; + dst[0] = src[0]; + dst[1] = src[1]; + dst[2] = src[0]; + dst[3] = src[1]; + } + break; + case 16: + for (i = cvt->len_cvt / 4; i; --i) { + src -= 4; + dst -= 8; + dst[0] = src[0]; + dst[1] = src[1]; + dst[2] = src[2]; + dst[3] = src[3]; + dst[4] = src[0]; + dst[5] = src[1]; + dst[6] = src[2]; + dst[7] = src[3]; + } + break; + } + cvt->len_cvt *= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Convert rate up by multiple of 2, for quad */ -void SDLCALL SDL_RateMUL2_c4(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_RateMUL2_c4 (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Uint8 *src, *dst; + int i; + Uint8 *src, *dst; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting audio rate * 2\n"); + fprintf (stderr, "Converting audio rate * 2\n"); #endif - src = cvt->buf+cvt->len_cvt; - dst = cvt->buf+cvt->len_cvt*2; - switch (format & 0xFF) { - case 8: - for ( i=cvt->len_cvt/4; i; --i ) { - src -= 4; - dst -= 8; - dst[0] = src[0]; - dst[1] = src[1]; - dst[2] = src[2]; - dst[3] = src[3]; - dst[4] = src[0]; - dst[5] = src[1]; - dst[6] = src[2]; - dst[7] = src[3]; - } - break; - case 16: - for ( i=cvt->len_cvt/8; i; --i ) { - src -= 8; - dst -= 16; - dst[0] = src[0]; - dst[1] = src[1]; - dst[2] = src[2]; - dst[3] = src[3]; - dst[4] = src[4]; - dst[5] = src[5]; - dst[6] = src[6]; - dst[7] = src[7]; - dst[8] = src[0]; - dst[9] = src[1]; - dst[10] = src[2]; - dst[11] = src[3]; - dst[12] = src[4]; - dst[13] = src[5]; - dst[14] = src[6]; - dst[15] = src[7]; - } - break; - } - cvt->len_cvt *= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf + cvt->len_cvt; + dst = cvt->buf + cvt->len_cvt * 2; + switch (format & 0xFF) { + case 8: + for (i = cvt->len_cvt / 4; i; --i) { + src -= 4; + dst -= 8; + dst[0] = src[0]; + dst[1] = src[1]; + dst[2] = src[2]; + dst[3] = src[3]; + dst[4] = src[0]; + dst[5] = src[1]; + dst[6] = src[2]; + dst[7] = src[3]; + } + break; + case 16: + for (i = cvt->len_cvt / 8; i; --i) { + src -= 8; + dst -= 16; + dst[0] = src[0]; + dst[1] = src[1]; + dst[2] = src[2]; + dst[3] = src[3]; + dst[4] = src[4]; + dst[5] = src[5]; + dst[6] = src[6]; + dst[7] = src[7]; + dst[8] = src[0]; + dst[9] = src[1]; + dst[10] = src[2]; + dst[11] = src[3]; + dst[12] = src[4]; + dst[13] = src[5]; + dst[14] = src[6]; + dst[15] = src[7]; + } + break; + } + cvt->len_cvt *= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Convert rate up by multiple of 2, for 5.1 */ -void SDLCALL SDL_RateMUL2_c6(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_RateMUL2_c6 (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Uint8 *src, *dst; + int i; + Uint8 *src, *dst; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting audio rate * 2\n"); + fprintf (stderr, "Converting audio rate * 2\n"); #endif - src = cvt->buf+cvt->len_cvt; - dst = cvt->buf+cvt->len_cvt*2; - switch (format & 0xFF) { - case 8: - for ( i=cvt->len_cvt/6; i; --i ) { - src -= 6; - dst -= 12; - dst[0] = src[0]; - dst[1] = src[1]; - dst[2] = src[2]; - dst[3] = src[3]; - dst[4] = src[4]; - dst[5] = src[5]; - dst[6] = src[0]; - dst[7] = src[1]; - dst[8] = src[2]; - dst[9] = src[3]; - dst[10] = src[4]; - dst[11] = src[5]; - } - break; - case 16: - for ( i=cvt->len_cvt/12; i; --i ) { - src -= 12; - dst -= 24; - dst[0] = src[0]; - dst[1] = src[1]; - dst[2] = src[2]; - dst[3] = src[3]; - dst[4] = src[4]; - dst[5] = src[5]; - dst[6] = src[6]; - dst[7] = src[7]; - dst[8] = src[8]; - dst[9] = src[9]; - dst[10] = src[10]; - dst[11] = src[11]; - dst[12] = src[0]; - dst[13] = src[1]; - dst[14] = src[2]; - dst[15] = src[3]; - dst[16] = src[4]; - dst[17] = src[5]; - dst[18] = src[6]; - dst[19] = src[7]; - dst[20] = src[8]; - dst[21] = src[9]; - dst[22] = src[10]; - dst[23] = src[11]; - } - break; - } - cvt->len_cvt *= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf + cvt->len_cvt; + dst = cvt->buf + cvt->len_cvt * 2; + switch (format & 0xFF) { + case 8: + for (i = cvt->len_cvt / 6; i; --i) { + src -= 6; + dst -= 12; + dst[0] = src[0]; + dst[1] = src[1]; + dst[2] = src[2]; + dst[3] = src[3]; + dst[4] = src[4]; + dst[5] = src[5]; + dst[6] = src[0]; + dst[7] = src[1]; + dst[8] = src[2]; + dst[9] = src[3]; + dst[10] = src[4]; + dst[11] = src[5]; + } + break; + case 16: + for (i = cvt->len_cvt / 12; i; --i) { + src -= 12; + dst -= 24; + dst[0] = src[0]; + dst[1] = src[1]; + dst[2] = src[2]; + dst[3] = src[3]; + dst[4] = src[4]; + dst[5] = src[5]; + dst[6] = src[6]; + dst[7] = src[7]; + dst[8] = src[8]; + dst[9] = src[9]; + dst[10] = src[10]; + dst[11] = src[11]; + dst[12] = src[0]; + dst[13] = src[1]; + dst[14] = src[2]; + dst[15] = src[3]; + dst[16] = src[4]; + dst[17] = src[5]; + dst[18] = src[6]; + dst[19] = src[7]; + dst[20] = src[8]; + dst[21] = src[9]; + dst[22] = src[10]; + dst[23] = src[11]; + } + break; + } + cvt->len_cvt *= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Convert rate down by multiple of 2 */ -void SDLCALL SDL_RateDIV2(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_RateDIV2 (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Uint8 *src, *dst; + int i; + Uint8 *src, *dst; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting audio rate / 2\n"); + fprintf (stderr, "Converting audio rate / 2\n"); #endif - src = cvt->buf; - dst = cvt->buf; - switch (format & 0xFF) { - case 8: - for ( i=cvt->len_cvt/2; i; --i ) { - dst[0] = src[0]; - src += 2; - dst += 1; - } - break; - case 16: - for ( i=cvt->len_cvt/4; i; --i ) { - dst[0] = src[0]; - dst[1] = src[1]; - src += 4; - dst += 2; - } - break; - } - cvt->len_cvt /= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf; + dst = cvt->buf; + switch (format & 0xFF) { + case 8: + for (i = cvt->len_cvt / 2; i; --i) { + dst[0] = src[0]; + src += 2; + dst += 1; + } + break; + case 16: + for (i = cvt->len_cvt / 4; i; --i) { + dst[0] = src[0]; + dst[1] = src[1]; + src += 4; + dst += 2; + } + break; + } + cvt->len_cvt /= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Convert rate down by multiple of 2, for stereo */ -void SDLCALL SDL_RateDIV2_c2(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_RateDIV2_c2 (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Uint8 *src, *dst; + int i; + Uint8 *src, *dst; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting audio rate / 2\n"); + fprintf (stderr, "Converting audio rate / 2\n"); #endif - src = cvt->buf; - dst = cvt->buf; - switch (format & 0xFF) { - case 8: - for ( i=cvt->len_cvt/4; i; --i ) { - dst[0] = src[0]; - dst[1] = src[1]; - src += 4; - dst += 2; - } - break; - case 16: - for ( i=cvt->len_cvt/8; i; --i ) { - dst[0] = src[0]; - dst[1] = src[1]; - dst[2] = src[2]; - dst[3] = src[3]; - src += 8; - dst += 4; - } - break; - } - cvt->len_cvt /= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf; + dst = cvt->buf; + switch (format & 0xFF) { + case 8: + for (i = cvt->len_cvt / 4; i; --i) { + dst[0] = src[0]; + dst[1] = src[1]; + src += 4; + dst += 2; + } + break; + case 16: + for (i = cvt->len_cvt / 8; i; --i) { + dst[0] = src[0]; + dst[1] = src[1]; + dst[2] = src[2]; + dst[3] = src[3]; + src += 8; + dst += 4; + } + break; + } + cvt->len_cvt /= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Convert rate down by multiple of 2, for quad */ -void SDLCALL SDL_RateDIV2_c4(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_RateDIV2_c4 (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Uint8 *src, *dst; + int i; + Uint8 *src, *dst; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting audio rate / 2\n"); + fprintf (stderr, "Converting audio rate / 2\n"); #endif - src = cvt->buf; - dst = cvt->buf; - switch (format & 0xFF) { - case 8: - for ( i=cvt->len_cvt/8; i; --i ) { - dst[0] = src[0]; - dst[1] = src[1]; - dst[2] = src[2]; - dst[3] = src[3]; - src += 8; - dst += 4; - } - break; - case 16: - for ( i=cvt->len_cvt/16; i; --i ) { - dst[0] = src[0]; - dst[1] = src[1]; - dst[2] = src[2]; - dst[3] = src[3]; - dst[4] = src[4]; - dst[5] = src[5]; - dst[6] = src[6]; - dst[7] = src[7]; - src += 16; - dst += 8; - } - break; - } - cvt->len_cvt /= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf; + dst = cvt->buf; + switch (format & 0xFF) { + case 8: + for (i = cvt->len_cvt / 8; i; --i) { + dst[0] = src[0]; + dst[1] = src[1]; + dst[2] = src[2]; + dst[3] = src[3]; + src += 8; + dst += 4; + } + break; + case 16: + for (i = cvt->len_cvt / 16; i; --i) { + dst[0] = src[0]; + dst[1] = src[1]; + dst[2] = src[2]; + dst[3] = src[3]; + dst[4] = src[4]; + dst[5] = src[5]; + dst[6] = src[6]; + dst[7] = src[7]; + src += 16; + dst += 8; + } + break; + } + cvt->len_cvt /= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Convert rate down by multiple of 2, for 5.1 */ -void SDLCALL SDL_RateDIV2_c6(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_RateDIV2_c6 (SDL_AudioCVT * cvt, Uint16 format) { - int i; - Uint8 *src, *dst; + int i; + Uint8 *src, *dst; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting audio rate / 2\n"); + fprintf (stderr, "Converting audio rate / 2\n"); #endif - src = cvt->buf; - dst = cvt->buf; - switch (format & 0xFF) { - case 8: - for ( i=cvt->len_cvt/12; i; --i ) { - dst[0] = src[0]; - dst[1] = src[1]; - dst[2] = src[2]; - dst[3] = src[3]; - dst[4] = src[4]; - dst[5] = src[5]; - src += 12; - dst += 6; - } - break; - case 16: - for ( i=cvt->len_cvt/24; i; --i ) { - dst[0] = src[0]; - dst[1] = src[1]; - dst[2] = src[2]; - dst[3] = src[3]; - dst[4] = src[4]; - dst[5] = src[5]; - dst[6] = src[6]; - dst[7] = src[7]; - dst[8] = src[8]; - dst[9] = src[9]; - dst[10] = src[10]; - dst[11] = src[11]; - src += 24; - dst += 12; - } - break; - } - cvt->len_cvt /= 2; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + src = cvt->buf; + dst = cvt->buf; + switch (format & 0xFF) { + case 8: + for (i = cvt->len_cvt / 12; i; --i) { + dst[0] = src[0]; + dst[1] = src[1]; + dst[2] = src[2]; + dst[3] = src[3]; + dst[4] = src[4]; + dst[5] = src[5]; + src += 12; + dst += 6; + } + break; + case 16: + for (i = cvt->len_cvt / 24; i; --i) { + dst[0] = src[0]; + dst[1] = src[1]; + dst[2] = src[2]; + dst[3] = src[3]; + dst[4] = src[4]; + dst[5] = src[5]; + dst[6] = src[6]; + dst[7] = src[7]; + dst[8] = src[8]; + dst[9] = src[9]; + dst[10] = src[10]; + dst[11] = src[11]; + src += 24; + dst += 12; + } + break; + } + cvt->len_cvt /= 2; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } /* Very slow rate conversion routine */ -void SDLCALL SDL_RateSLOW(SDL_AudioCVT *cvt, Uint16 format) +void SDLCALL +SDL_RateSLOW (SDL_AudioCVT * cvt, Uint16 format) { - double ipos; - int i, clen; + double ipos; + int i, clen; #ifdef DEBUG_CONVERT - fprintf(stderr, "Converting audio rate * %4.4f\n", 1.0/cvt->rate_incr); + fprintf (stderr, "Converting audio rate * %4.4f\n", 1.0 / cvt->rate_incr); #endif - clen = (int)((double)cvt->len_cvt / cvt->rate_incr); - if ( cvt->rate_incr > 1.0 ) { - switch (format & 0xFF) { - case 8: { - Uint8 *output; + clen = (int) ((double) cvt->len_cvt / cvt->rate_incr); + if (cvt->rate_incr > 1.0) { + switch (format & 0xFF) { + case 8: + { + Uint8 *output; - output = cvt->buf; - ipos = 0.0; - for ( i=clen; i; --i ) { - *output = cvt->buf[(int)ipos]; - ipos += cvt->rate_incr; - output += 1; - } - } - break; + output = cvt->buf; + ipos = 0.0; + for (i = clen; i; --i) { + *output = cvt->buf[(int) ipos]; + ipos += cvt->rate_incr; + output += 1; + } + } + break; - case 16: { - Uint16 *output; + case 16: + { + Uint16 *output; - clen &= ~1; - output = (Uint16 *)cvt->buf; - ipos = 0.0; - for ( i=clen/2; i; --i ) { - *output=((Uint16 *)cvt->buf)[(int)ipos]; - ipos += cvt->rate_incr; - output += 1; - } - } - break; - } - } else { - switch (format & 0xFF) { - case 8: { - Uint8 *output; + clen &= ~1; + output = (Uint16 *) cvt->buf; + ipos = 0.0; + for (i = clen / 2; i; --i) { + *output = ((Uint16 *) cvt->buf)[(int) ipos]; + ipos += cvt->rate_incr; + output += 1; + } + } + break; + } + } else { + switch (format & 0xFF) { + case 8: + { + Uint8 *output; - output = cvt->buf+clen; - ipos = (double)cvt->len_cvt; - for ( i=clen; i; --i ) { - ipos -= cvt->rate_incr; - output -= 1; - *output = cvt->buf[(int)ipos]; - } - } - break; + output = cvt->buf + clen; + ipos = (double) cvt->len_cvt; + for (i = clen; i; --i) { + ipos -= cvt->rate_incr; + output -= 1; + *output = cvt->buf[(int) ipos]; + } + } + break; - case 16: { - Uint16 *output; + case 16: + { + Uint16 *output; - clen &= ~1; - output = (Uint16 *)(cvt->buf+clen); - ipos = (double)cvt->len_cvt/2; - for ( i=clen/2; i; --i ) { - ipos -= cvt->rate_incr; - output -= 1; - *output=((Uint16 *)cvt->buf)[(int)ipos]; - } - } - break; - } - } - cvt->len_cvt = clen; - if ( cvt->filters[++cvt->filter_index] ) { - cvt->filters[cvt->filter_index](cvt, format); - } + clen &= ~1; + output = (Uint16 *) (cvt->buf + clen); + ipos = (double) cvt->len_cvt / 2; + for (i = clen / 2; i; --i) { + ipos -= cvt->rate_incr; + output -= 1; + *output = ((Uint16 *) cvt->buf)[(int) ipos]; + } + } + break; + } + } + cvt->len_cvt = clen; + if (cvt->filters[++cvt->filter_index]) { + cvt->filters[cvt->filter_index] (cvt, format); + } } -int SDL_ConvertAudio(SDL_AudioCVT *cvt) +int +SDL_ConvertAudio (SDL_AudioCVT * cvt) { - /* Make sure there's data to convert */ - if ( cvt->buf == NULL ) { - SDL_SetError("No buffer allocated for conversion"); - return(-1); - } - /* Return okay if no conversion is necessary */ - cvt->len_cvt = cvt->len; - if ( cvt->filters[0] == NULL ) { - return(0); - } + /* Make sure there's data to convert */ + if (cvt->buf == NULL) { + SDL_SetError ("No buffer allocated for conversion"); + return (-1); + } + /* Return okay if no conversion is necessary */ + cvt->len_cvt = cvt->len; + if (cvt->filters[0] == NULL) { + return (0); + } - /* Set up the conversion and go! */ - cvt->filter_index = 0; - cvt->filters[0](cvt, cvt->src_format); - return(0); + /* Set up the conversion and go! */ + cvt->filter_index = 0; + cvt->filters[0] (cvt, cvt->src_format); + return (0); } /* Creates a set of audio filters to convert from one format to another. Returns -1 if the format conversion is not supported, or 1 if the audio filter is set up. */ - -int SDL_BuildAudioCVT(SDL_AudioCVT *cvt, - Uint16 src_format, Uint8 src_channels, int src_rate, - Uint16 dst_format, Uint8 dst_channels, int dst_rate) + +int +SDL_BuildAudioCVT (SDL_AudioCVT * cvt, + Uint16 src_format, Uint8 src_channels, int src_rate, + Uint16 dst_format, Uint8 dst_channels, int dst_rate) { /*printf("Build format %04x->%04x, channels %u->%u, rate %d->%d\n", src_format, dst_format, src_channels, dst_channels, src_rate, dst_rate);*/ - /* Start off with no conversion necessary */ - cvt->needed = 0; - cvt->filter_index = 0; - cvt->filters[0] = NULL; - cvt->len_mult = 1; - cvt->len_ratio = 1.0; + /* Start off with no conversion necessary */ + cvt->needed = 0; + cvt->filter_index = 0; + cvt->filters[0] = NULL; + cvt->len_mult = 1; + cvt->len_ratio = 1.0; + + /* First filter: Endian conversion from src to dst */ + if ((src_format & 0x1000) != (dst_format & 0x1000) + && ((src_format & 0xff) != 8)) { + cvt->filters[cvt->filter_index++] = SDL_ConvertEndian; + } + + /* Second filter: Sign conversion -- signed/unsigned */ + if ((src_format & 0x8000) != (dst_format & 0x8000)) { + cvt->filters[cvt->filter_index++] = SDL_ConvertSign; + } - /* First filter: Endian conversion from src to dst */ - if ( (src_format & 0x1000) != (dst_format & 0x1000) - && ((src_format & 0xff) != 8) ) { - cvt->filters[cvt->filter_index++] = SDL_ConvertEndian; - } - - /* Second filter: Sign conversion -- signed/unsigned */ - if ( (src_format & 0x8000) != (dst_format & 0x8000) ) { - cvt->filters[cvt->filter_index++] = SDL_ConvertSign; - } + /* Next filter: Convert 16 bit <--> 8 bit PCM */ + if ((src_format & 0xFF) != (dst_format & 0xFF)) { + switch (dst_format & 0x10FF) { + case AUDIO_U8: + cvt->filters[cvt->filter_index++] = SDL_Convert8; + cvt->len_ratio /= 2; + break; + case AUDIO_U16LSB: + cvt->filters[cvt->filter_index++] = SDL_Convert16LSB; + cvt->len_mult *= 2; + cvt->len_ratio *= 2; + break; + case AUDIO_U16MSB: + cvt->filters[cvt->filter_index++] = SDL_Convert16MSB; + cvt->len_mult *= 2; + cvt->len_ratio *= 2; + break; + } + } - /* Next filter: Convert 16 bit <--> 8 bit PCM */ - if ( (src_format & 0xFF) != (dst_format & 0xFF) ) { - switch (dst_format&0x10FF) { - case AUDIO_U8: - cvt->filters[cvt->filter_index++] = - SDL_Convert8; - cvt->len_ratio /= 2; - break; - case AUDIO_U16LSB: - cvt->filters[cvt->filter_index++] = - SDL_Convert16LSB; - cvt->len_mult *= 2; - cvt->len_ratio *= 2; - break; - case AUDIO_U16MSB: - cvt->filters[cvt->filter_index++] = - SDL_Convert16MSB; - cvt->len_mult *= 2; - cvt->len_ratio *= 2; - break; - } - } + /* Last filter: Mono/Stereo conversion */ + if (src_channels != dst_channels) { + if ((src_channels == 1) && (dst_channels > 1)) { + cvt->filters[cvt->filter_index++] = SDL_ConvertStereo; + cvt->len_mult *= 2; + src_channels = 2; + cvt->len_ratio *= 2; + } + if ((src_channels == 2) && (dst_channels == 6)) { + cvt->filters[cvt->filter_index++] = SDL_ConvertSurround; + src_channels = 6; + cvt->len_mult *= 3; + cvt->len_ratio *= 3; + } + if ((src_channels == 2) && (dst_channels == 4)) { + cvt->filters[cvt->filter_index++] = SDL_ConvertSurround_4; + src_channels = 4; + cvt->len_mult *= 2; + cvt->len_ratio *= 2; + } + while ((src_channels * 2) <= dst_channels) { + cvt->filters[cvt->filter_index++] = SDL_ConvertStereo; + cvt->len_mult *= 2; + src_channels *= 2; + cvt->len_ratio *= 2; + } + if ((src_channels == 6) && (dst_channels <= 2)) { + cvt->filters[cvt->filter_index++] = SDL_ConvertStrip; + src_channels = 2; + cvt->len_ratio /= 3; + } + if ((src_channels == 6) && (dst_channels == 4)) { + cvt->filters[cvt->filter_index++] = SDL_ConvertStrip_2; + src_channels = 4; + cvt->len_ratio /= 2; + } + /* This assumes that 4 channel audio is in the format: + Left {front/back} + Right {front/back} + so converting to L/R stereo works properly. + */ + while (((src_channels % 2) == 0) && + ((src_channels / 2) >= dst_channels)) { + cvt->filters[cvt->filter_index++] = SDL_ConvertMono; + src_channels /= 2; + cvt->len_ratio /= 2; + } + if (src_channels != dst_channels) { + /* Uh oh.. */ ; + } + } - /* Last filter: Mono/Stereo conversion */ - if ( src_channels != dst_channels ) { - if ( (src_channels == 1) && (dst_channels > 1) ) { - cvt->filters[cvt->filter_index++] = - SDL_ConvertStereo; - cvt->len_mult *= 2; - src_channels = 2; - cvt->len_ratio *= 2; - } - if ( (src_channels == 2) && - (dst_channels == 6) ) { - cvt->filters[cvt->filter_index++] = - SDL_ConvertSurround; - src_channels = 6; - cvt->len_mult *= 3; - cvt->len_ratio *= 3; - } - if ( (src_channels == 2) && - (dst_channels == 4) ) { - cvt->filters[cvt->filter_index++] = - SDL_ConvertSurround_4; - src_channels = 4; - cvt->len_mult *= 2; - cvt->len_ratio *= 2; - } - while ( (src_channels*2) <= dst_channels ) { - cvt->filters[cvt->filter_index++] = - SDL_ConvertStereo; - cvt->len_mult *= 2; - src_channels *= 2; - cvt->len_ratio *= 2; - } - if ( (src_channels == 6) && - (dst_channels <= 2) ) { - cvt->filters[cvt->filter_index++] = - SDL_ConvertStrip; - src_channels = 2; - cvt->len_ratio /= 3; - } - if ( (src_channels == 6) && - (dst_channels == 4) ) { - cvt->filters[cvt->filter_index++] = - SDL_ConvertStrip_2; - src_channels = 4; - cvt->len_ratio /= 2; - } - /* This assumes that 4 channel audio is in the format: - Left {front/back} + Right {front/back} - so converting to L/R stereo works properly. - */ - while ( ((src_channels%2) == 0) && - ((src_channels/2) >= dst_channels) ) { - cvt->filters[cvt->filter_index++] = - SDL_ConvertMono; - src_channels /= 2; - cvt->len_ratio /= 2; - } - if ( src_channels != dst_channels ) { - /* Uh oh.. */; - } - } + /* Do rate conversion */ + cvt->rate_incr = 0.0; + if ((src_rate / 100) != (dst_rate / 100)) { + Uint32 hi_rate, lo_rate; + int len_mult; + double len_ratio; + void (SDLCALL * rate_cvt) (SDL_AudioCVT * cvt, Uint16 format); - /* Do rate conversion */ - cvt->rate_incr = 0.0; - if ( (src_rate/100) != (dst_rate/100) ) { - Uint32 hi_rate, lo_rate; - int len_mult; - double len_ratio; - void (SDLCALL *rate_cvt)(SDL_AudioCVT *cvt, Uint16 format); + if (src_rate > dst_rate) { + hi_rate = src_rate; + lo_rate = dst_rate; + switch (src_channels) { + case 1: + rate_cvt = SDL_RateDIV2; + break; + case 2: + rate_cvt = SDL_RateDIV2_c2; + break; + case 4: + rate_cvt = SDL_RateDIV2_c4; + break; + case 6: + rate_cvt = SDL_RateDIV2_c6; + break; + default: + return -1; + } + len_mult = 1; + len_ratio = 0.5; + } else { + hi_rate = dst_rate; + lo_rate = src_rate; + switch (src_channels) { + case 1: + rate_cvt = SDL_RateMUL2; + break; + case 2: + rate_cvt = SDL_RateMUL2_c2; + break; + case 4: + rate_cvt = SDL_RateMUL2_c4; + break; + case 6: + rate_cvt = SDL_RateMUL2_c6; + break; + default: + return -1; + } + len_mult = 2; + len_ratio = 2.0; + } + /* If hi_rate = lo_rate*2^x then conversion is easy */ + while (((lo_rate * 2) / 100) <= (hi_rate / 100)) { + cvt->filters[cvt->filter_index++] = rate_cvt; + cvt->len_mult *= len_mult; + lo_rate *= 2; + cvt->len_ratio *= len_ratio; + } + /* We may need a slow conversion here to finish up */ + if ((lo_rate / 100) != (hi_rate / 100)) { +#if 1 + /* The problem with this is that if the input buffer is + say 1K, and the conversion rate is say 1.1, then the + output buffer is 1.1K, which may not be an acceptable + buffer size for the audio driver (not a power of 2) + */ + /* For now, punt and hope the rate distortion isn't great. + */ +#else + if (src_rate < dst_rate) { + cvt->rate_incr = (double) lo_rate / hi_rate; + cvt->len_mult *= 2; + cvt->len_ratio /= cvt->rate_incr; + } else { + cvt->rate_incr = (double) hi_rate / lo_rate; + cvt->len_ratio *= cvt->rate_incr; + } + cvt->filters[cvt->filter_index++] = SDL_RateSLOW; +#endif + } + } - if ( src_rate > dst_rate ) { - hi_rate = src_rate; - lo_rate = dst_rate; - switch (src_channels) { - case 1: rate_cvt = SDL_RateDIV2; break; - case 2: rate_cvt = SDL_RateDIV2_c2; break; - case 4: rate_cvt = SDL_RateDIV2_c4; break; - case 6: rate_cvt = SDL_RateDIV2_c6; break; - default: return -1; - } - len_mult = 1; - len_ratio = 0.5; - } else { - hi_rate = dst_rate; - lo_rate = src_rate; - switch (src_channels) { - case 1: rate_cvt = SDL_RateMUL2; break; - case 2: rate_cvt = SDL_RateMUL2_c2; break; - case 4: rate_cvt = SDL_RateMUL2_c4; break; - case 6: rate_cvt = SDL_RateMUL2_c6; break; - default: return -1; - } - len_mult = 2; - len_ratio = 2.0; - } - /* If hi_rate = lo_rate*2^x then conversion is easy */ - while ( ((lo_rate*2)/100) <= (hi_rate/100) ) { - cvt->filters[cvt->filter_index++] = rate_cvt; - cvt->len_mult *= len_mult; - lo_rate *= 2; - cvt->len_ratio *= len_ratio; - } - /* We may need a slow conversion here to finish up */ - if ( (lo_rate/100) != (hi_rate/100) ) { -#if 1 - /* The problem with this is that if the input buffer is - say 1K, and the conversion rate is say 1.1, then the - output buffer is 1.1K, which may not be an acceptable - buffer size for the audio driver (not a power of 2) - */ - /* For now, punt and hope the rate distortion isn't great. - */ -#else - if ( src_rate < dst_rate ) { - cvt->rate_incr = (double)lo_rate/hi_rate; - cvt->len_mult *= 2; - cvt->len_ratio /= cvt->rate_incr; - } else { - cvt->rate_incr = (double)hi_rate/lo_rate; - cvt->len_ratio *= cvt->rate_incr; - } - cvt->filters[cvt->filter_index++] = SDL_RateSLOW; -#endif - } - } + /* Set up the filter information */ + if (cvt->filter_index != 0) { + cvt->needed = 1; + cvt->src_format = src_format; + cvt->dst_format = dst_format; + cvt->len = 0; + cvt->buf = NULL; + cvt->filters[cvt->filter_index] = NULL; + } + return (cvt->needed); +} - /* Set up the filter information */ - if ( cvt->filter_index != 0 ) { - cvt->needed = 1; - cvt->src_format = src_format; - cvt->dst_format = dst_format; - cvt->len = 0; - cvt->buf = NULL; - cvt->filters[cvt->filter_index] = NULL; - } - return(cvt->needed); -} +/* vi: set ts=4 sw=4 expandtab: */