[0] | 1 | //convert.c: |
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| 2 | |
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| 3 | #include "libroar.h" |
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| 4 | |
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| 5 | int roar_conv_bits (void * out, void * in, int samples, int from, int to) { |
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| 6 | if ( from == to ) { |
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| 7 | if ( in == out ) |
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| 8 | return 0; |
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| 9 | |
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| 10 | memcpy(out, in, samples * from / 8); |
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| 11 | return 0; |
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| 12 | } |
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| 13 | |
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| 14 | if ( from == 8 && to == 16 ) |
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| 15 | return roar_conv_bits_8to16(out, in, samples); |
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| 16 | |
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| 17 | if ( from == 16 && to == 8 ) |
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| 18 | return roar_conv_bits_16to8(out, in, samples); |
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| 19 | |
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| 20 | return -1; |
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| 21 | } |
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| 22 | |
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| 23 | int roar_conv_bits_8to16 (void * out, void * in, int samples) { |
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| 24 | char * ip = (char *)in; |
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| 25 | int16_t * op = (int16_t*)out; |
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| 26 | int i; |
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| 27 | |
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| 28 | for (i = samples - 1; i >= 0; i--) |
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| 29 | op[i] = ip[i] << 8; |
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| 30 | |
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| 31 | return 0; |
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| 32 | } |
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| 33 | |
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| 34 | int roar_conv_bits_16to8 (void * out, void * in, int samples) { |
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| 35 | int16_t * ip = (int16_t*)in; |
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| 36 | char * op = (char *)out; |
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| 37 | int i; |
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| 38 | |
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| 39 | for (i = 0; i < samples; i++) |
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| 40 | op[i] = ip[i] >> 8; |
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| 41 | |
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| 42 | return 0; |
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| 43 | } |
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| 44 | |
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| 45 | |
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| 46 | int roar_conv_chans (void * out, void * in, int samples, int from, int to, int bits) { |
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| 47 | if ( from == 1 ) { |
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| 48 | if ( bits == 8 ) { |
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| 49 | return roar_conv_chans_1ton8(out, in, samples, to); |
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| 50 | } else if ( bits == 16 ) { |
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| 51 | return roar_conv_chans_1ton16(out, in, samples, to); |
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| 52 | } else { |
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| 53 | return -1; |
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| 54 | } |
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| 55 | } |
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| 56 | |
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| 57 | return -1; |
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| 58 | } |
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| 59 | |
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| 60 | int roar_conv_chans_1ton8 (void * out, void * in, int samples, int to) { |
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| 61 | char * ip = (char*) in, * op = (char*) out; |
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| 62 | int i; |
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| 63 | int c; |
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| 64 | |
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| 65 | for (i = samples - 1; i >= 0; i--) |
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| 66 | for (c = to - 1; c >= 0; c--) |
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| 67 | op[i*to + c] = ip[i]; |
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| 68 | |
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| 69 | return 0; |
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| 70 | } |
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| 71 | |
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| 72 | int roar_conv_chans_1ton16 (void * out, void * in, int samples, int to) { |
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| 73 | int16_t * ip = (int16_t*) in, * op = (int16_t*) out; |
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| 74 | int i; |
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| 75 | int c; |
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| 76 | |
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| 77 | for (i = samples - 1; i >= 0; i--) |
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| 78 | for (c = to - 1; c >= 0; c--) |
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| 79 | op[i*to + c] = ip[i]; |
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| 80 | |
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| 81 | return 0; |
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| 82 | } |
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| 83 | |
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| 84 | int roar_conv_rate (void * out, void * in, int samples, int from, int to, int bits, int channels) { |
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| 85 | if ( bits == 8 ) |
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| 86 | return roar_conv_rate_8(out, in, samples, from, to, channels); |
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| 87 | |
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| 88 | if ( bits == 16 ) |
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| 89 | return roar_conv_rate_16(out, in, samples, from, to, channels); |
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| 90 | |
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| 91 | return -1; |
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| 92 | } |
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| 93 | |
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| 94 | int roar_conv_rate_8 (void * out, void * in, int samples, int from, int to, int channels) { |
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| 95 | return -1; |
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| 96 | } |
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| 97 | int roar_conv_rate_16 (void * out, void * in, int samples, int from, int to, int channels) { |
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| 98 | int16_t * ip = in, * op = out; |
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| 99 | int16_t avg; |
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| 100 | int i, j, c; |
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| 101 | float scale = to/from; |
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| 102 | int step; |
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| 103 | |
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| 104 | |
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| 105 | if ( scale > 1 ) { |
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| 106 | if ( scale - (int)scale != (float)0 ) |
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| 107 | return -1; |
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| 108 | |
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| 109 | step = scale; |
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| 110 | /* |
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| 111 | for (i = 0; i < samples/step; i++) |
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| 112 | for (j = 0; j < step; j++) |
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| 113 | for (c = 0; c < channels; c++) |
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| 114 | op[i + j*channels + c] = ip[i + c]; |
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| 115 | */ |
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| 116 | if ( step == 2 ) { |
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| 117 | for (i = 0; i < samples/step; i += channels) { |
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| 118 | for (j = 0; j < step; j++) { |
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| 119 | for (c = 0; c < channels; c++) { |
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| 120 | op[i*step + j*channels + c] = ip[i+c]; |
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| 121 | } |
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| 122 | } |
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| 123 | } |
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| 124 | return 0; |
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| 125 | } |
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| 126 | return -1; |
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| 127 | } else { |
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| 128 | scale = 1/scale; |
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| 129 | |
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| 130 | if ( scale - (int)scale != (float)0 ) |
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| 131 | return -1; |
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| 132 | |
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| 133 | step = scale; |
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| 134 | |
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| 135 | for (i = 0; i < samples/step; i++) { |
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| 136 | avg = 0; |
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| 137 | for (j = 0; j < step; j++) |
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| 138 | avg += ip[i*step + j]; |
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| 139 | |
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| 140 | op[i] = avg/step; |
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| 141 | } |
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| 142 | return 0; |
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| 143 | } |
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| 144 | |
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| 145 | return -1; |
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| 146 | } |
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| 147 | |
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| 148 | int raor_conv_codec (void * out, void * in, int samples, int from, int to, int bits) { |
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| 149 | int inbo = ROAR_CODEC_BYTE_ORDER(from), outbo = ROAR_CODEC_BYTE_ORDER(to); |
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| 150 | int ins = ROAR_CODEC_IS_SIGNED(from), outs = ROAR_CODEC_IS_SIGNED(to); |
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| 151 | |
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| 152 | if ( inbo != outbo ) |
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| 153 | return -1; |
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| 154 | |
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| 155 | if ( ins != outs ) { |
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| 156 | if ( ins && !outs ) { |
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| 157 | if ( bits == 8 ) { |
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| 158 | roar_conv_codec_s2u8(out, in, samples); |
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| 159 | } else { |
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| 160 | return -1; |
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| 161 | } |
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| 162 | } else { |
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| 163 | return -1; |
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| 164 | } |
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| 165 | } |
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| 166 | |
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| 167 | return 0; |
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| 168 | } |
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| 169 | |
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| 170 | int roar_conv_codec_s2u8 (void * out, void * in, int samples) { |
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| 171 | char * ip = in; |
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| 172 | unsigned char * op = out; |
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| 173 | int i; |
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| 174 | |
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| 175 | for(i = 0; i < samples; i++) |
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| 176 | op[i] = ip[i] + 128; |
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| 177 | |
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| 178 | return 0; |
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| 179 | } |
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| 180 | |
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| 181 | |
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| 182 | int roar_conv (void * out, void * in, int samples, struct roar_audio_info * from, struct roar_audio_info * to) { |
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| 183 | void * ip = in; |
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| 184 | |
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| 185 | // TODO: decide how to work around both in and out beeing to small to hold all |
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| 186 | // data between the steps. |
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| 187 | // for the moment: guess out >= in |
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| 188 | |
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| 189 | if ( from->bits != to->bits ) { |
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| 190 | if ( roar_conv_bits(out, ip, samples, from->bits, to->bits) == -1 ) |
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| 191 | return -1; |
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| 192 | else |
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| 193 | ip = out; |
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| 194 | } |
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| 195 | |
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| 196 | if ( from->channels != to->channels ) { |
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| 197 | if ( roar_conv_chans(out, ip, samples, from->channels, to->channels, to->bits) == -1 ) |
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| 198 | return -1; |
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| 199 | else |
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| 200 | ip = out; |
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| 201 | } |
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| 202 | |
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| 203 | if ( from->rate != to->rate ) { |
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| 204 | if ( roar_conv_rate(out, ip, samples, from->rate, to->rate, to->bits, to->channels) == -1 ) |
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| 205 | return -1; |
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| 206 | else |
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| 207 | ip = out; |
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| 208 | } |
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| 209 | |
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| 210 | if ( from->codec != to->codec ) |
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| 211 | return -1; |
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| 212 | |
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| 213 | return 0; |
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| 214 | } |
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| 215 | |
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| 216 | //ll |
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