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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1905 | serge | 1 | /* |
| 2 | synth_ntom.h: ntom-resampling synth functions |
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| 3 | |||
| 4 | This header is used multiple times to create different variants of this function. |
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| 5 | Hint: MONO_NAME, MONO2STEREO_NAME, SYNTH_NAME and SAMPLE_T as well as WRITE_SAMPLE do vary. |
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| 6 | |||
| 7 | copyright 1995-2008 by the mpg123 project - free software under the terms of the LGPL 2.1 |
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| 8 | see COPYING and AUTHORS files in distribution or http://mpg123.org |
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| 9 | initially written by Michael Hipp, generalized by Thomas Orgis |
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| 10 | |||
| 11 | Well, this is very simple resampling... you may or may not like what you hear. |
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| 12 | But it's cheap. |
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| 13 | But still, we don't implement a non-autoincrement version of this one. |
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| 14 | */ |
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| 15 | |||
| 16 | /* Note: These mono functions would also work generically, |
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| 17 | it's just that they need a runtime calculation for the conversion loop... |
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| 18 | The fixed XtoY functions have the chance for loop unrolling... */ |
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| 19 | |||
| 20 | int MONO_NAME(real *bandPtr, mpg123_handle *fr) |
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| 21 | { |
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| 22 | SAMPLE_T samples_tmp[8*64]; |
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| 23 | SAMPLE_T *tmp1 = samples_tmp; |
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| 24 | size_t i; |
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| 25 | int ret; |
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| 26 | |||
| 27 | size_t pnt = fr->buffer.fill; |
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| 28 | unsigned char *samples = fr->buffer.data; |
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| 29 | fr->buffer.data = (unsigned char*) samples_tmp; |
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| 30 | fr->buffer.fill = 0; |
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| 31 | ret = SYNTH_NAME(bandPtr, 0, fr, 1); |
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| 32 | fr->buffer.data = samples; |
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| 33 | |||
| 34 | samples += pnt; |
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| 35 | for(i=0;i<(fr->buffer.fill/(2*sizeof(SAMPLE_T)));i++) |
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| 36 | { |
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| 37 | *( (SAMPLE_T *)samples) = *tmp1; |
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| 38 | samples += sizeof(SAMPLE_T); |
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| 39 | tmp1 += 2; |
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| 40 | } |
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| 41 | fr->buffer.fill = pnt + (fr->buffer.fill/2); |
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| 42 | |||
| 43 | return ret; |
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| 44 | } |
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| 45 | |||
| 46 | |||
| 47 | int MONO2STEREO_NAME(real *bandPtr, mpg123_handle *fr) |
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| 48 | { |
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| 49 | size_t i; |
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| 50 | int ret; |
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| 51 | size_t pnt1 = fr->buffer.fill; |
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| 52 | unsigned char *samples = fr->buffer.data + pnt1; |
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| 53 | |||
| 54 | ret = SYNTH_NAME(bandPtr, 0, fr, 1); |
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| 55 | |||
| 56 | for(i=0;i<((fr->buffer.fill-pnt1)/(2*sizeof(SAMPLE_T)));i++) |
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| 57 | { |
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| 58 | ((SAMPLE_T *)samples)[1] = ((SAMPLE_T *)samples)[0]; |
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| 59 | samples+=2*sizeof(SAMPLE_T); |
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| 60 | } |
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| 61 | |||
| 62 | return ret; |
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| 63 | } |
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| 64 | |||
| 65 | |||
| 66 | int SYNTH_NAME(real *bandPtr,int channel, mpg123_handle *fr, int final) |
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| 67 | { |
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| 68 | static const int step = 2; |
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| 69 | SAMPLE_T *samples = (SAMPLE_T *) (fr->buffer.data + fr->buffer.fill); |
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| 70 | |||
| 71 | real *b0, **buf; /* (*buf)[0x110]; */ |
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| 72 | int clip = 0; |
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| 73 | int bo1; |
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| 74 | int ntom; |
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| 75 | |||
| 76 | if(fr->have_eq_settings) do_equalizer(bandPtr,channel,fr->equalizer); |
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| 77 | |||
| 78 | if(!channel) |
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| 79 | { |
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| 80 | fr->bo--; |
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| 81 | fr->bo &= 0xf; |
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| 82 | buf = fr->real_buffs[0]; |
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| 83 | ntom = fr->ntom_val[1] = fr->ntom_val[0]; |
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| 84 | } |
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| 85 | else |
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| 86 | { |
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| 87 | samples++; |
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| 88 | buf = fr->real_buffs[1]; |
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| 89 | ntom = fr->ntom_val[1]; |
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| 90 | } |
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| 91 | |||
| 92 | if(fr->bo & 0x1) |
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| 93 | { |
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| 94 | b0 = buf[0]; |
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| 95 | bo1 = fr->bo; |
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| 96 | dct64(buf[1]+((fr->bo+1)&0xf),buf[0]+fr->bo,bandPtr); |
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| 97 | } |
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| 98 | else |
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| 99 | { |
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| 100 | b0 = buf[1]; |
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| 101 | bo1 = fr->bo+1; |
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| 102 | dct64(buf[0]+fr->bo,buf[1]+fr->bo+1,bandPtr); |
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| 103 | } |
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| 104 | |||
| 105 | { |
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| 106 | register int j; |
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| 107 | real *window = fr->decwin + 16 - bo1; |
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| 108 | |||
| 109 | for (j=16;j;j--,window+=0x10) |
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| 110 | { |
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| 111 | real sum; |
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| 112 | |||
| 113 | ntom += fr->ntom_step; |
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| 114 | if(ntom < NTOM_MUL) |
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| 115 | { |
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| 116 | window += 16; |
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| 117 | b0 += 16; |
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| 118 | continue; |
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| 119 | } |
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| 120 | |||
| 121 | sum = REAL_MUL_SYNTH(*window++, *b0++); |
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| 122 | sum -= REAL_MUL_SYNTH(*window++, *b0++); |
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| 123 | sum += REAL_MUL_SYNTH(*window++, *b0++); |
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| 124 | sum -= REAL_MUL_SYNTH(*window++, *b0++); |
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| 125 | sum += REAL_MUL_SYNTH(*window++, *b0++); |
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| 126 | sum -= REAL_MUL_SYNTH(*window++, *b0++); |
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| 127 | sum += REAL_MUL_SYNTH(*window++, *b0++); |
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| 128 | sum -= REAL_MUL_SYNTH(*window++, *b0++); |
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| 129 | sum += REAL_MUL_SYNTH(*window++, *b0++); |
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| 130 | sum -= REAL_MUL_SYNTH(*window++, *b0++); |
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| 131 | sum += REAL_MUL_SYNTH(*window++, *b0++); |
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| 132 | sum -= REAL_MUL_SYNTH(*window++, *b0++); |
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| 133 | sum += REAL_MUL_SYNTH(*window++, *b0++); |
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| 134 | sum -= REAL_MUL_SYNTH(*window++, *b0++); |
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| 135 | sum += REAL_MUL_SYNTH(*window++, *b0++); |
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| 136 | sum -= REAL_MUL_SYNTH(*window++, *b0++); |
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| 137 | |||
| 138 | while(ntom >= NTOM_MUL) |
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| 139 | { |
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| 140 | WRITE_SAMPLE(samples,sum,clip); |
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| 141 | samples += step; |
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| 142 | ntom -= NTOM_MUL; |
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| 143 | } |
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| 144 | } |
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| 145 | |||
| 146 | ntom += fr->ntom_step; |
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| 147 | if(ntom >= NTOM_MUL) |
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| 148 | { |
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| 149 | real sum; |
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| 150 | sum = REAL_MUL_SYNTH(window[0x0], b0[0x0]); |
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| 151 | sum += REAL_MUL_SYNTH(window[0x2], b0[0x2]); |
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| 152 | sum += REAL_MUL_SYNTH(window[0x4], b0[0x4]); |
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| 153 | sum += REAL_MUL_SYNTH(window[0x6], b0[0x6]); |
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| 154 | sum += REAL_MUL_SYNTH(window[0x8], b0[0x8]); |
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| 155 | sum += REAL_MUL_SYNTH(window[0xA], b0[0xA]); |
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| 156 | sum += REAL_MUL_SYNTH(window[0xC], b0[0xC]); |
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| 157 | sum += REAL_MUL_SYNTH(window[0xE], b0[0xE]); |
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| 158 | |||
| 159 | while(ntom >= NTOM_MUL) |
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| 160 | { |
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| 161 | WRITE_SAMPLE(samples,sum,clip); |
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| 162 | samples += step; |
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| 163 | ntom -= NTOM_MUL; |
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| 164 | } |
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| 165 | } |
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| 166 | |||
| 167 | b0-=0x10,window-=0x20; |
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| 168 | window += bo1<<1; |
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| 169 | |||
| 170 | for (j=15;j;j--,b0-=0x20,window-=0x10) |
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| 171 | { |
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| 172 | real sum; |
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| 173 | |||
| 174 | ntom += fr->ntom_step; |
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| 175 | if(ntom < NTOM_MUL) |
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| 176 | { |
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| 177 | window -= 16; |
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| 178 | b0 += 16; |
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| 179 | continue; |
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| 180 | } |
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| 181 | |||
| 182 | sum = REAL_MUL_SYNTH(-*(--window), *b0++); |
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| 183 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 184 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 185 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 186 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 187 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 188 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 189 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 190 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 191 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 192 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 193 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 194 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 195 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 196 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 197 | sum -= REAL_MUL_SYNTH(*(--window), *b0++); |
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| 198 | |||
| 199 | while(ntom >= NTOM_MUL) |
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| 200 | { |
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| 201 | WRITE_SAMPLE(samples,sum,clip); |
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| 202 | samples += step; |
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| 203 | ntom -= NTOM_MUL; |
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| 204 | } |
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| 205 | } |
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| 206 | } |
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| 207 | |||
| 208 | fr->ntom_val[channel] = ntom; |
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| 209 | if(final) fr->buffer.fill = ((unsigned char *) samples - fr->buffer.data - (channel ? sizeof(SAMPLE_T) : 0)); |
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| 210 | |||
| 211 | return clip; |
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| 212 | } |
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| 213 |