109 lines
3.8 KiB
C
109 lines
3.8 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* Cstr - from Namco NuSound v1 games [Mr. Driller (GC), Star Fox Assault (GC), Donkey Konga (GC)] */
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VGMSTREAM * init_vgmstream_cstr(STREAMFILE* sf) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset;
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size_t interleave, first_skip;
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int loop_flag, channels, sample_rate;
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int loop_start, loop_end, num_samples, num_nibbles;
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/* checks */
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if (!check_extensions(sf,"dsp"))
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goto fail;
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if (read_u32be(0x00,sf) != 0x43737472) /* "Cstr" */
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goto fail;
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/* 0x04: version (0x0066 = 0.66 as seen in nus_config .txt) */
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interleave = read_u16be(0x06, sf);
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/* 0x08: config? (volume/pan/etc?) */
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first_skip = read_s32be(0x0c, sf); /* first interleaved block has normal size, but starts late */
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loop_start = read_s32be(0x10, sf);
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/* 0x14: num samples LE or null in mono files */
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/* 0x18: sample rate LE or null in mono files */
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/* 0x01a: always 0x40 */
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channels = read_u8(0x1b, sf); /* mono only seen in R:Racing Evolution radio sfx */
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/* 0x1c: always null */
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/* next is DSP header, with some oddities:
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* - loop flag isn't always set vs Cstr's flag (won't have DSP loop_ps/etc)
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* - loop start nibbles can be wrong even with loop flag set
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* - wonky loop_ps as a result (other fields agree between channels) */
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num_samples = read_s32be(0x20 + 0x00, sf);
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num_nibbles = read_s32be(0x20 + 0x04, sf);
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sample_rate = read_s32be(0x20 + 0x08, sf);
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//loop_flag = read_s16be(0x20 + 0x0c, sf);
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//loop_start = read_s32be(0x20 + 0x10, sf);
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loop_end = read_s32be(0x20 + 0x14, sf);
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loop_flag = (loop_start >= 0);
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start_offset = 0x20 + 0x60 * channels + first_skip;
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/* nonlooped tracks may not set first skip for no reason, but can be tested with initial p/s */
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if (!loop_flag && channels == 2 && first_skip == 0) {
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while (first_skip < 0x800) {
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if (read_u16be(0x20 + 0x3e, sf) == read_u8(start_offset + first_skip, sf) &&
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read_u16be(0x20 + 0x60 + 0x3e, sf) == read_u8(start_offset + first_skip + interleave, sf))
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break;
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first_skip += 0x08;
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}
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/* not found */
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if (first_skip == 0x800)
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first_skip = 0;
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else
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start_offset += first_skip;
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}
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if (first_skip > 0 && loop_start >= (interleave - first_skip))
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loop_start = loop_start - (interleave - first_skip);
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loop_start = loop_start * 2;
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/* Mr. Driller oddity, unreliable loop flag */
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if (loop_end == num_nibbles) {
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loop_flag = 0;
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}
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/* Mr. Driller oddity, half nibbles */
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if (loop_end * 2 + 1 <= num_nibbles) {
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loop_end = loop_end * 2;
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}
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/* no loop_ps checks given how buggy the format is */
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channels, loop_flag);
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if (!vgmstream) goto fail;
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vgmstream->sample_rate = sample_rate;
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vgmstream->num_samples = num_samples;
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vgmstream->loop_start_sample = dsp_bytes_to_samples(loop_start, channels);
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vgmstream->loop_end_sample = dsp_nibbles_to_samples(loop_end) + 1;
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/* Donkey Konga 3 oddity, loop/num nibbles not correct vs final samples */
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if (vgmstream->loop_end_sample > num_samples)
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vgmstream->loop_end_sample = num_samples;
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vgmstream->coding_type = coding_NGC_DSP;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = interleave;
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vgmstream->interleave_first_block_size = interleave - first_skip;
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vgmstream->interleave_first_skip = first_skip;
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vgmstream->meta_type = meta_DSP_CSTR;
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dsp_read_coefs_be(vgmstream, sf, 0x3c, 0x60);
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if (!vgmstream_open_stream(vgmstream, sf, start_offset))
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goto fail;
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return vgmstream;
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fail:
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close_vgmstream(vgmstream);
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return NULL;
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}
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