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https://github.com/vgmstream/vgmstream.git
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61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
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#include "coding.h"
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#include "../util.h"
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/* ADPCM found in NDS games using Procyon Studio Digital Sound Elements */
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static const int8_t proc_coef[5][2] =
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{
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{0x00,0x00},
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{0x3C,0x00},
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{0x73,0xCC},
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{0x62,0xC9},
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{0x7A,0xC4},
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};
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void decode_nds_procyon(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
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int i=first_sample;
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int32_t sample_count;
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int framesin = first_sample/30;
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uint8_t header = read_8bit(framesin*16+15+stream->offset,stream->streamfile) ^ 0x80;
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int scale = 12 - (header & 0xf);
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int coef_index = (header >> 4) & 0xf;
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int32_t hist1 = stream->adpcm_history1_32;
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int32_t hist2 = stream->adpcm_history2_32;
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int32_t coef1;
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int32_t coef2;
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if (coef_index > 4) coef_index = 0;
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coef1 = proc_coef[coef_index][0];
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coef2 = proc_coef[coef_index][1];
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first_sample = first_sample%30;
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for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
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int sample_byte = read_8bit(framesin*16+stream->offset+i/2,stream->streamfile) ^ 0x80;
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int32_t sample =
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(int32_t)
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(i&1?
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get_high_nibble_signed(sample_byte):
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get_low_nibble_signed(sample_byte)
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) * 64 * 64;
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if (scale < 0)
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{
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sample <<= -scale;
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}
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else
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sample >>= scale;
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sample = (hist1 * coef1 + hist2 * coef2 + 32) / 64 + (sample * 64);
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hist2 = hist1;
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hist1 = sample;
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outbuf[sample_count] = clamp16((sample + 32) / 64) / 64 * 64;
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}
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stream->adpcm_history1_32 = hist1;
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stream->adpcm_history2_32 = hist2;
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}
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