mirror of
https://github.com/vgmstream/vgmstream.git
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67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
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#include "coding.h"
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#include "../util.h"
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long EA_XA_TABLE[28] = {0,0,240,0,460,-208,0x0188,-220,
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0x0000,0x0000,0x00F0,0x0000,
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0x01CC,0x0000,0x0188,0x0000,
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0x0000,0x0000,0x0000,0x0000,
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-208,-1,-220,-1,
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0x0000,0x0000,0x0000,0x3F70};
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void decode_eaxa(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do,int channel) {
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uint8_t frame_info;
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int32_t sample_count;
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long coef1,coef2;
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int i,shift;
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off_t channel_offset=stream->channel_start_offset;
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first_sample = first_sample%28;
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frame_info = (uint8_t)read_8bit(stream->offset+channel_offset,stream->streamfile);
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if(frame_info==0xEE) {
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channel_offset++;
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stream->adpcm_history1_32 = read_16bitBE(stream->offset+channel_offset+(2*channel),stream->streamfile);
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stream->adpcm_history2_32 = read_16bitBE(stream->offset+channel_offset+2+(2*channel),stream->streamfile);
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channel_offset+=(2*channelspacing);
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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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outbuf[sample_count]=read_16bitBE(stream->offset+channel_offset,stream->streamfile);
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channel_offset+=2;
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}
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// Only increment offset on complete frame
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if(channel_offset-stream->channel_start_offset==(2*28)+5)
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stream->channel_start_offset+=(2*28)+5;
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} else {
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coef1 = EA_XA_TABLE[((frame_info >> 4) & 0x0F) << 1];
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coef2 = EA_XA_TABLE[(((frame_info >> 4) & 0x0F) << 1) + 1];
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shift = (frame_info & 0x0F) + 8;
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channel_offset++;
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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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uint8_t sample_byte = (uint8_t)read_8bit(stream->offset+channel_offset+i/2,stream->streamfile);
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int32_t sample = ((((i&1?
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sample_byte & 0x0F:
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sample_byte >> 4
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) << 0x1C) >> shift) +
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(coef1 * stream->adpcm_history1_32) + (coef2 * stream->adpcm_history2_32)) >> 8;
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outbuf[sample_count] = clamp16(sample);
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stream->adpcm_history2_32 = stream->adpcm_history1_32;
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stream->adpcm_history1_32 = sample;
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}
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channel_offset+=i/2;
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// Only increment offset on complete frame
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if(channel_offset-stream->channel_start_offset==0x0F)
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stream->channel_start_offset+=0x0F;
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}
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}
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