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comparison src/audio/SDL_audiocvt.c @ 1659:14717b52abc0 SDL-1.3

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Merge trunk-1.3-3
author Sam Lantinga <slouken@libsdl.org>
date Wed, 17 May 2006 08:18:28 +0000
parents 5f52867ba65c
children 782fd950bd46 c121d94672cb 4e23720e4278
comparison
equal deleted inserted replaced
1658:e49147870aac 1659:14717b52abc0
25 25
26 #include "SDL_audio.h" 26 #include "SDL_audio.h"
27 27
28 28
29 /* Effectively mix right and left channels into a single channel */ 29 /* Effectively mix right and left channels into a single channel */
30 void SDL_ConvertMono(SDL_AudioCVT *cvt, Uint16 format) 30 void SDLCALL SDL_ConvertMono(SDL_AudioCVT *cvt, Uint16 format)
31 { 31 {
32 int i; 32 int i;
33 Sint32 sample; 33 Sint32 sample;
34 34
35 #ifdef DEBUG_CONVERT 35 #ifdef DEBUG_CONVERT
167 cvt->filters[cvt->filter_index](cvt, format); 167 cvt->filters[cvt->filter_index](cvt, format);
168 } 168 }
169 } 169 }
170 170
171 /* Discard top 4 channels */ 171 /* Discard top 4 channels */
172 void SDL_ConvertStrip(SDL_AudioCVT *cvt, Uint16 format) 172 void SDLCALL SDL_ConvertStrip(SDL_AudioCVT *cvt, Uint16 format)
173 { 173 {
174 int i; 174 int i;
175 Sint32 lsample, rsample; 175 Sint32 lsample, rsample;
176 176
177 #ifdef DEBUG_CONVERT 177 #ifdef DEBUG_CONVERT
283 } 283 }
284 } 284 }
285 285
286 286
287 /* Discard top 2 channels of 6 */ 287 /* Discard top 2 channels of 6 */
288 void SDL_ConvertStrip_2(SDL_AudioCVT *cvt, Uint16 format) 288 void SDLCALL SDL_ConvertStrip_2(SDL_AudioCVT *cvt, Uint16 format)
289 { 289 {
290 int i; 290 int i;
291 Sint32 lsample, rsample; 291 Sint32 lsample, rsample;
292 292
293 #ifdef DEBUG_CONVERT 293 #ifdef DEBUG_CONVERT
398 cvt->filters[cvt->filter_index](cvt, format); 398 cvt->filters[cvt->filter_index](cvt, format);
399 } 399 }
400 } 400 }
401 401
402 /* Duplicate a mono channel to both stereo channels */ 402 /* Duplicate a mono channel to both stereo channels */
403 void SDL_ConvertStereo(SDL_AudioCVT *cvt, Uint16 format) 403 void SDLCALL SDL_ConvertStereo(SDL_AudioCVT *cvt, Uint16 format)
404 { 404 {
405 int i; 405 int i;
406 406
407 #ifdef DEBUG_CONVERT 407 #ifdef DEBUG_CONVERT
408 fprintf(stderr, "Converting to stereo\n"); 408 fprintf(stderr, "Converting to stereo\n");
436 } 436 }
437 } 437 }
438 438
439 439
440 /* Duplicate a stereo channel to a pseudo-5.1 stream */ 440 /* Duplicate a stereo channel to a pseudo-5.1 stream */
441 void SDL_ConvertSurround(SDL_AudioCVT *cvt, Uint16 format) 441 void SDLCALL SDL_ConvertSurround(SDL_AudioCVT *cvt, Uint16 format)
442 { 442 {
443 int i; 443 int i;
444 444
445 #ifdef DEBUG_CONVERT 445 #ifdef DEBUG_CONVERT
446 fprintf(stderr, "Converting stereo to surround\n"); 446 fprintf(stderr, "Converting stereo to surround\n");
613 } 613 }
614 } 614 }
615 615
616 616
617 /* Duplicate a stereo channel to a pseudo-4.0 stream */ 617 /* Duplicate a stereo channel to a pseudo-4.0 stream */
618 void SDL_ConvertSurround_4(SDL_AudioCVT *cvt, Uint16 format) 618 void SDLCALL SDL_ConvertSurround_4(SDL_AudioCVT *cvt, Uint16 format)
619 { 619 {
620 int i; 620 int i;
621 621
622 #ifdef DEBUG_CONVERT 622 #ifdef DEBUG_CONVERT
623 fprintf(stderr, "Converting stereo to quad\n"); 623 fprintf(stderr, "Converting stereo to quad\n");
766 } 766 }
767 } 767 }
768 768
769 769
770 /* Convert 8-bit to 16-bit - LSB */ 770 /* Convert 8-bit to 16-bit - LSB */
771 void SDL_Convert16LSB(SDL_AudioCVT *cvt, Uint16 format) 771 void SDLCALL SDL_Convert16LSB(SDL_AudioCVT *cvt, Uint16 format)
772 { 772 {
773 int i; 773 int i;
774 Uint8 *src, *dst; 774 Uint8 *src, *dst;
775 775
776 #ifdef DEBUG_CONVERT 776 #ifdef DEBUG_CONVERT
789 if ( cvt->filters[++cvt->filter_index] ) { 789 if ( cvt->filters[++cvt->filter_index] ) {
790 cvt->filters[cvt->filter_index](cvt, format); 790 cvt->filters[cvt->filter_index](cvt, format);
791 } 791 }
792 } 792 }
793 /* Convert 8-bit to 16-bit - MSB */ 793 /* Convert 8-bit to 16-bit - MSB */
794 void SDL_Convert16MSB(SDL_AudioCVT *cvt, Uint16 format) 794 void SDLCALL SDL_Convert16MSB(SDL_AudioCVT *cvt, Uint16 format)
795 { 795 {
796 int i; 796 int i;
797 Uint8 *src, *dst; 797 Uint8 *src, *dst;
798 798
799 #ifdef DEBUG_CONVERT 799 #ifdef DEBUG_CONVERT
813 cvt->filters[cvt->filter_index](cvt, format); 813 cvt->filters[cvt->filter_index](cvt, format);
814 } 814 }
815 } 815 }
816 816
817 /* Convert 16-bit to 8-bit */ 817 /* Convert 16-bit to 8-bit */
818 void SDL_Convert8(SDL_AudioCVT *cvt, Uint16 format) 818 void SDLCALL SDL_Convert8(SDL_AudioCVT *cvt, Uint16 format)
819 { 819 {
820 int i; 820 int i;
821 Uint8 *src, *dst; 821 Uint8 *src, *dst;
822 822
823 #ifdef DEBUG_CONVERT 823 #ifdef DEBUG_CONVERT
839 cvt->filters[cvt->filter_index](cvt, format); 839 cvt->filters[cvt->filter_index](cvt, format);
840 } 840 }
841 } 841 }
842 842
843 /* Toggle signed/unsigned */ 843 /* Toggle signed/unsigned */
844 void SDL_ConvertSign(SDL_AudioCVT *cvt, Uint16 format) 844 void SDLCALL SDL_ConvertSign(SDL_AudioCVT *cvt, Uint16 format)
845 { 845 {
846 int i; 846 int i;
847 Uint8 *data; 847 Uint8 *data;
848 848
849 #ifdef DEBUG_CONVERT 849 #ifdef DEBUG_CONVERT
868 cvt->filters[cvt->filter_index](cvt, format); 868 cvt->filters[cvt->filter_index](cvt, format);
869 } 869 }
870 } 870 }
871 871
872 /* Toggle endianness */ 872 /* Toggle endianness */
873 void SDL_ConvertEndian(SDL_AudioCVT *cvt, Uint16 format) 873 void SDLCALL SDL_ConvertEndian(SDL_AudioCVT *cvt, Uint16 format)
874 { 874 {
875 int i; 875 int i;
876 Uint8 *data, tmp; 876 Uint8 *data, tmp;
877 877
878 #ifdef DEBUG_CONVERT 878 #ifdef DEBUG_CONVERT
890 cvt->filters[cvt->filter_index](cvt, format); 890 cvt->filters[cvt->filter_index](cvt, format);
891 } 891 }
892 } 892 }
893 893
894 /* Convert rate up by multiple of 2 */ 894 /* Convert rate up by multiple of 2 */
895 void SDL_RateMUL2(SDL_AudioCVT *cvt, Uint16 format) 895 void SDLCALL SDL_RateMUL2(SDL_AudioCVT *cvt, Uint16 format)
896 { 896 {
897 int i; 897 int i;
898 Uint8 *src, *dst; 898 Uint8 *src, *dst;
899 899
900 #ifdef DEBUG_CONVERT 900 #ifdef DEBUG_CONVERT
928 } 928 }
929 } 929 }
930 930
931 931
932 /* Convert rate up by multiple of 2, for stereo */ 932 /* Convert rate up by multiple of 2, for stereo */
933 void SDL_RateMUL2_c2(SDL_AudioCVT *cvt, Uint16 format) 933 void SDLCALL SDL_RateMUL2_c2(SDL_AudioCVT *cvt, Uint16 format)
934 { 934 {
935 int i; 935 int i;
936 Uint8 *src, *dst; 936 Uint8 *src, *dst;
937 937
938 #ifdef DEBUG_CONVERT 938 #ifdef DEBUG_CONVERT
971 cvt->filters[cvt->filter_index](cvt, format); 971 cvt->filters[cvt->filter_index](cvt, format);
972 } 972 }
973 } 973 }
974 974
975 /* Convert rate up by multiple of 2, for quad */ 975 /* Convert rate up by multiple of 2, for quad */
976 void SDL_RateMUL2_c4(SDL_AudioCVT *cvt, Uint16 format) 976 void SDLCALL SDL_RateMUL2_c4(SDL_AudioCVT *cvt, Uint16 format)
977 { 977 {
978 int i; 978 int i;
979 Uint8 *src, *dst; 979 Uint8 *src, *dst;
980 980
981 #ifdef DEBUG_CONVERT 981 #ifdef DEBUG_CONVERT
1027 } 1027 }
1028 } 1028 }
1029 1029
1030 1030
1031 /* Convert rate up by multiple of 2, for 5.1 */ 1031 /* Convert rate up by multiple of 2, for 5.1 */
1032 void SDL_RateMUL2_c6(SDL_AudioCVT *cvt, Uint16 format) 1032 void SDLCALL SDL_RateMUL2_c6(SDL_AudioCVT *cvt, Uint16 format)
1033 { 1033 {
1034 int i; 1034 int i;
1035 Uint8 *src, *dst; 1035 Uint8 *src, *dst;
1036 1036
1037 #ifdef DEBUG_CONVERT 1037 #ifdef DEBUG_CONVERT
1094 cvt->filters[cvt->filter_index](cvt, format); 1094 cvt->filters[cvt->filter_index](cvt, format);
1095 } 1095 }
1096 } 1096 }
1097 1097
1098 /* Convert rate down by multiple of 2 */ 1098 /* Convert rate down by multiple of 2 */
1099 void SDL_RateDIV2(SDL_AudioCVT *cvt, Uint16 format) 1099 void SDLCALL SDL_RateDIV2(SDL_AudioCVT *cvt, Uint16 format)
1100 { 1100 {
1101 int i; 1101 int i;
1102 Uint8 *src, *dst; 1102 Uint8 *src, *dst;
1103 1103
1104 #ifdef DEBUG_CONVERT 1104 #ifdef DEBUG_CONVERT
1129 } 1129 }
1130 } 1130 }
1131 1131
1132 1132
1133 /* Convert rate down by multiple of 2, for stereo */ 1133 /* Convert rate down by multiple of 2, for stereo */
1134 void SDL_RateDIV2_c2(SDL_AudioCVT *cvt, Uint16 format) 1134 void SDLCALL SDL_RateDIV2_c2(SDL_AudioCVT *cvt, Uint16 format)
1135 { 1135 {
1136 int i; 1136 int i;
1137 Uint8 *src, *dst; 1137 Uint8 *src, *dst;
1138 1138
1139 #ifdef DEBUG_CONVERT 1139 #ifdef DEBUG_CONVERT
1167 } 1167 }
1168 } 1168 }
1169 1169
1170 1170
1171 /* Convert rate down by multiple of 2, for quad */ 1171 /* Convert rate down by multiple of 2, for quad */
1172 void SDL_RateDIV2_c4(SDL_AudioCVT *cvt, Uint16 format) 1172 void SDLCALL SDL_RateDIV2_c4(SDL_AudioCVT *cvt, Uint16 format)
1173 { 1173 {
1174 int i; 1174 int i;
1175 Uint8 *src, *dst; 1175 Uint8 *src, *dst;
1176 1176
1177 #ifdef DEBUG_CONVERT 1177 #ifdef DEBUG_CONVERT
1210 cvt->filters[cvt->filter_index](cvt, format); 1210 cvt->filters[cvt->filter_index](cvt, format);
1211 } 1211 }
1212 } 1212 }
1213 1213
1214 /* Convert rate down by multiple of 2, for 5.1 */ 1214 /* Convert rate down by multiple of 2, for 5.1 */
1215 void SDL_RateDIV2_c6(SDL_AudioCVT *cvt, Uint16 format) 1215 void SDLCALL SDL_RateDIV2_c6(SDL_AudioCVT *cvt, Uint16 format)
1216 { 1216 {
1217 int i; 1217 int i;
1218 Uint8 *src, *dst; 1218 Uint8 *src, *dst;
1219 1219
1220 #ifdef DEBUG_CONVERT 1220 #ifdef DEBUG_CONVERT
1259 cvt->filters[cvt->filter_index](cvt, format); 1259 cvt->filters[cvt->filter_index](cvt, format);
1260 } 1260 }
1261 } 1261 }
1262 1262
1263 /* Very slow rate conversion routine */ 1263 /* Very slow rate conversion routine */
1264 void SDL_RateSLOW(SDL_AudioCVT *cvt, Uint16 format) 1264 void SDLCALL SDL_RateSLOW(SDL_AudioCVT *cvt, Uint16 format)
1265 { 1265 {
1266 double ipos; 1266 double ipos;
1267 int i, clen; 1267 int i, clen;
1268 1268
1269 #ifdef DEBUG_CONVERT 1269 #ifdef DEBUG_CONVERT
1472 cvt->rate_incr = 0.0; 1472 cvt->rate_incr = 0.0;
1473 if ( (src_rate/100) != (dst_rate/100) ) { 1473 if ( (src_rate/100) != (dst_rate/100) ) {
1474 Uint32 hi_rate, lo_rate; 1474 Uint32 hi_rate, lo_rate;
1475 int len_mult; 1475 int len_mult;
1476 double len_ratio; 1476 double len_ratio;
1477 void (*rate_cvt)(SDL_AudioCVT *cvt, Uint16 format); 1477 void (SDLCALL *rate_cvt)(SDL_AudioCVT *cvt, Uint16 format);
1478 1478
1479 if ( src_rate > dst_rate ) { 1479 if ( src_rate > dst_rate ) {
1480 hi_rate = src_rate; 1480 hi_rate = src_rate;
1481 lo_rate = dst_rate; 1481 lo_rate = dst_rate;
1482 switch (src_channels) { 1482 switch (src_channels) {