137 lines
6.5 KiB
C
137 lines
6.5 KiB
C
#include "coding.h"
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#include "../util.h"
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/* A hybrid of IMA and Yamaha ADPCM found in Metal Gear Solid 3
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* Thanks to X_Tra (http://metalgear.in/) for pointing me to the step size table.
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*
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* Layout: N tracks of 0x10 header + 0x80*2 (always 2ch; multichannels uses 4ch = 2ch track0 + 2ch track1 xN).
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*/
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static const int mtaf_step_indexes[16] = {
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-1, -1, -1, -1, 2, 4, 6, 8,
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-1, -1, -1, -1, 2, 4, 6, 8
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};
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static const int16_t mtaf_step_sizes[32][16] = {
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{ 1, 5, 9, 13, 16, 20, 24, 28,
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-1, -5, -9, -13, -16, -20, -24, -28, },
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{ 2, 6, 11, 15, 20, 24, 29, 33,
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-2, -6, -11, -15, -20, -24, -29, -33, },
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{ 2, 7, 13, 18, 23, 28, 34, 39,
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-2, -7, -13, -18, -23, -28, -34, -39, },
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{ 3, 9, 15, 21, 28, 34, 40, 46,
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-3, -9, -15, -21, -28, -34, -40, -46, },
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{ 3, 11, 18, 26, 33, 41, 48, 56,
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-3, -11, -18, -26, -33, -41, -48, -56, },
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{ 4, 13, 22, 31, 40, 49, 58, 67,
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-4, -13, -22, -31, -40, -49, -58, -67, },
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{ 5, 16, 26, 37, 48, 59, 69, 80,
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-5, -16, -26, -37, -48, -59, -69, -80, },
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{ 6, 19, 31, 44, 57, 70, 82, 95,
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-6, -19, -31, -44, -57, -70, -82, -95, },
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{ 7, 22, 38, 53, 68, 83, 99, 114,
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-7, -22, -38, -53, -68, -83, -99, -114, },
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{ 9, 27, 45, 63, 81, 99, 117, 135,
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-9, -27, -45, -63, -81, -99, -117, -135, },
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{ 10, 32, 53, 75, 96, 118, 139, 161,
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-10, -32, -53, -75, -96, -118, -139, -161, },
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{ 12, 38, 64, 90, 115, 141, 167, 193,
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-12, -38, -64, -90, -115, -141, -167, -193, },
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{ 15, 45, 76, 106, 137, 167, 198, 228,
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-15, -45, -76, -106, -137, -167, -198, -228, },
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{ 18, 54, 91, 127, 164, 200, 237, 273,
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-18, -54, -91, -127, -164, -200, -237, -273, },
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{ 21, 65, 108, 152, 195, 239, 282, 326,
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-21, -65, -108, -152, -195, -239, -282, -326, },
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{ 25, 77, 129, 181, 232, 284, 336, 388,
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-25, -77, -129, -181, -232, -284, -336, -388, },
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{ 30, 92, 153, 215, 276, 338, 399, 461,
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-30, -92, -153, -215, -276, -338, -399, -461, },
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{ 36, 109, 183, 256, 329, 402, 476, 549,
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-36, -109, -183, -256, -329, -402, -476, -549, },
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{ 43, 130, 218, 305, 392, 479, 567, 654,
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-43, -130, -218, -305, -392, -479, -567, -654, },
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{ 52, 156, 260, 364, 468, 572, 676, 780,
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-52, -156, -260, -364, -468, -572, -676, -780, },
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{ 62, 186, 310, 434, 558, 682, 806, 930,
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-62, -186, -310, -434, -558, -682, -806, -930, },
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{ 73, 221, 368, 516, 663, 811, 958, 1106,
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-73, -221, -368, -516, -663, -811, -958, -1106, },
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{ 87, 263, 439, 615, 790, 966, 1142, 1318,
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-87, -263, -439, -615, -790, -966, -1142, -1318, },
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{ 104, 314, 523, 733, 942, 1152, 1361, 1571,
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-104, -314, -523, -733, -942, -1152, -1361, -1571, },
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{ 124, 374, 623, 873, 1122, 1372, 1621, 1871,
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-124, -374, -623, -873, -1122, -1372, -1621, -1871, },
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{ 148, 445, 743, 1040, 1337, 1634, 1932, 2229,
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-148, -445, -743, -1040, -1337, -1634, -1932, -2229, },
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{ 177, 531, 885, 1239, 1593, 1947, 2301, 2655,
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-177, -531, -885, -1239, -1593, -1947, -2301, -2655, },
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{ 210, 632, 1053, 1475, 1896, 2318, 2739, 3161,
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-210, -632, -1053, -1475, -1896, -2318, -2739, -3161, },
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{ 251, 753, 1255, 1757, 2260, 2762, 3264, 3766,
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-251, -753, -1255, -1757, -2260, -2762, -3264, -3766, },
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{ 299, 897, 1495, 2093, 2692, 3290, 3888, 4486,
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-299, -897, -1495, -2093, -2692, -3290, -3888, -4486, },
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{ 356, 1068, 1781, 2493, 3206, 3918, 4631, 5343,
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-356, -1068, -1781, -2493, -3206, -3918, -4631, -5343, },
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{ 424, 1273, 2121, 2970, 3819, 4668, 5516, 6365,
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-424, -1273, -2121, -2970, -3819, -4668, -5516, -6365, },
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};
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void decode_mtaf(VGMSTREAMCHANNEL *stream, sample_t *outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do, int channel) {
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uint8_t frame[0x110] = {0};
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off_t frame_offset;
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int i, ch, sample_count = 0;
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size_t bytes_per_frame /*, samples_per_frame*/;
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int32_t hist = stream->adpcm_history1_16;
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int32_t step_index = stream->adpcm_step_index;
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/* special stereo interleave, stereo */
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bytes_per_frame = 0x10 + 0x80*2;
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//samples_per_frame = (bytes_per_frame - 0x10) / 2 * 2; /* 256 */
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ch = channel % 2; /* global channel to track channel */
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//first_sample = first_sample % samples_per_frame; /* for flat layout */
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/* read frame */
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frame_offset = stream->offset;
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read_streamfile(frame, frame_offset, bytes_per_frame, stream->streamfile); /* ignore EOF errors */
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/* parse frame header when we hit a new track every frame samples */
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if (first_sample == 0) {
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/* 0x10 header: track (8b, 0=first), track count (24b, 1=first), step-L, step-R, hist-L, hist-R */
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step_index = get_s16le(frame + 0x04 + 0x00 + ch*0x02); /* step-L/R */
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hist = get_s16le(frame + 0x04 + 0x04 + ch*0x04); /* hist-L/R: hist 16bit + empty 16bit */
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VGM_ASSERT(step_index < 0 || step_index > 31, "MTAF: bad header idx at 0x%x\n", (uint32_t)stream->offset);
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if (step_index < 0) {
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step_index = 0;
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} else if (step_index > 31) {
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step_index = 31;
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}
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}
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/* decode nibbles */
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for (i = first_sample; i < first_sample + samples_to_do; i++) {
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uint8_t nibbles = frame[0x10 + 0x80*ch + i/2];
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uint8_t nibble = (nibbles >> (!(i&1)?0:4)) & 0xf; /* lower first */
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hist = clamp16(hist + mtaf_step_sizes[step_index][nibble]);
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outbuf[sample_count] = hist;
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sample_count += channelspacing;
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step_index += mtaf_step_indexes[nibble];
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if (step_index < 0) {
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step_index = 0;
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} else if (step_index > 31) {
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step_index = 31;
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}
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}
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stream->adpcm_step_index = step_index;
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stream->adpcm_history1_16 = hist;
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}
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