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Fix NXAP ADPCM [Time Crisis 4 (PS3)]

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This commit is contained in:
bnnm 2020-01-13 21:16:09 +01:00
parent b6d6293c69
commit 37f270eb2b
2 changed files with 14 additions and 23 deletions
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28
src/coding/yamaha_decoder.c
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@ -28,7 +28,7 @@ static void yamaha_adpcmb_expand_nibble(VGMSTREAMCHANNEL * stream, off_t byte_of
delta = -delta;
sample = *hist1 + delta;
sample = clamp16(sample); /* this may not be needed (not done in Aska) but no byte changes */
sample = clamp16(sample); /* not needed in Aska but seems others do */
*step_size = ((*step_size) * scale_step_adpcmb[code]) >> 6;
if (*step_size < 0x7f) *step_size = 0x7f;
@ -150,13 +150,14 @@ void decode_aska(VGMSTREAMCHANNEL * stream, sample_t * outbuf, int channelspacin
}
/* Yamaha ADPCM with unknown expand variation (noisy), step size is double of normal Yamaha? */
/* NXAP ADPCM, Yamaha ADPCM-B with weird headered frames */
void decode_nxap(VGMSTREAMCHANNEL * stream, sample_t * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
int i, sample_count = 0, num_frame;
int32_t hist1 = stream->adpcm_history1_32;
int step_size = stream->adpcm_step_index;
int16_t out_sample;
/* external interleave */
/* external interleave, mono */
int block_samples = (0x40 - 0x4) * 2;
num_frame = first_sample / block_samples;
first_sample = first_sample % block_samples;
@ -165,29 +166,20 @@ void decode_nxap(VGMSTREAMCHANNEL * stream, sample_t * outbuf, int channelspacin
if (first_sample == 0) {
off_t header_offset = stream->offset + 0x40*num_frame;
hist1 = read_16bitLE(header_offset+0x00,stream->streamfile);
step_size = read_16bitLE(header_offset+0x02,stream->streamfile);
hist1 = read_s16le(header_offset+0x00,stream->streamfile);
step_size = read_u16le(header_offset+0x02,stream->streamfile) >> 1; /* remove lower bit, also note unsignedness */
if (step_size < 0x7f) step_size = 0x7f;
else if (step_size > 0x6000) step_size = 0x6000;
/* step's lower bit is hist1 sign (useless), and code doesn't seem to do anything useful with it? */
}
/* decode nibbles (layout: all nibbles from one channel) */
for (i = first_sample; i < first_sample + samples_to_do; i++) {
int code, delta, sample;
off_t byte_offset = (stream->offset + 0x40*num_frame + 0x04) + i/2;
int nibble_shift = (i&1?4:0); /* low nibble first? */
code = (read_8bit(byte_offset,stream->streamfile) >> nibble_shift)&0xf;
delta = (step_size * scale_delta[code]) / 8; //todo wrong
sample = hist1 + delta;
outbuf[sample_count] = clamp16(sample);
hist1 = outbuf[sample_count];
step_size = (step_size * scale_step_aica[code]) / 260.0; //todo wrong
if (step_size < 0x7f) step_size = 0x7f;
else if (step_size > 0x6000) step_size = 0x6000;
int nibble_shift = (i&1?0:4);
yamaha_adpcmb_expand_nibble(stream, byte_offset, nibble_shift, &hist1, &step_size, &out_sample);
outbuf[sample_count] = out_sample;
sample_count += channelspacing;
}

9
src/meta/nxap.c
View File

@ -19,7 +19,7 @@ VGMSTREAM * init_vgmstream_nxap(STREAMFILE *streamFile) {
start_offset = read_32bitLE(0x04,streamFile);
channel_count = read_32bitLE(0x0c,streamFile);
loop_flag = 0; //(read_32bitLE(0x24,streamFile) > 0); //todo
loop_flag = (read_32bitLE(0x24,streamFile) > 0);
/* build the VGMSTREAM */
@ -29,10 +29,9 @@ VGMSTREAM * init_vgmstream_nxap(STREAMFILE *streamFile) {
vgmstream->sample_rate = read_32bitLE(0x10, streamFile);
vgmstream->num_samples = read_32bitLE(0x1c,streamFile) * (0x40-0x04)*2 / channel_count; /* number of frames */
/* unknown loop format, also 0x28/2c values seem related */
//vgmstream->loop_start_sample = read_32bitLE(0x20,streamFile) * (0x40-0x04)*2 / channel_count;
//vgmstream->loop_end_sample = read_32bitLE(0x24,streamFile) * (0x40-0x04)*2 / channel_count;
//vgmstream->loop_end_sample = vgmstream->loop_start_sample + vgmstream->loop_end_sample;
/* in channel blocks, also 0x28/2c values seem related */
vgmstream->loop_start_sample = read_32bitLE(0x20,streamFile) * (0x40-0x04)*2;
vgmstream->loop_end_sample = read_32bitLE(0x24,streamFile) * (0x40-0x04)*2;
vgmstream->meta_type = meta_NXAP;
vgmstream->coding_type = coding_NXAP;