mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-18 17:35:53 +01:00
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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static int check_subinterleave(STREAMFILE* sf, uint32_t start_offset);
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/* GCub - found in Black Box/Shaba games (engine?) [Sega Soccer Slam (GC), Shrek the Third (CC), Shrek Superslam (GC)] */
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VGMSTREAM* init_vgmstream_gcub(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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uint32_t start_offset, data_size;
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int channels, loop_flag, sample_rate;
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int is_subinterleave;
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/* checks */
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if (!is_id32be(0x00,sf, "GCub"))
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goto fail;
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/* .wav: extension found in bigfile
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* .gcub: header id */
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if (!check_extensions(sf, "wav,lwav,gcub"))
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goto fail;
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loop_flag = 0;
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channels = read_u32be(0x04,sf);
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sample_rate = read_u32be(0x08,sf);
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data_size = read_u32be(0x0c,sf);
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if (is_id32be(0x60,sf, "GCxx")) /* seen in sfx */
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start_offset = 0x88;
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else
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start_offset = 0x60;
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/* Shaba/Shrek games use it but no header diffs, detect by inspecting data
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* (could try checking initial PS but not enough for files that start with 0s) */
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is_subinterleave = 0;
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if (channels > 1)
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is_subinterleave = check_subinterleave(sf, start_offset);
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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->meta_type = meta_GCUB;
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vgmstream->sample_rate = sample_rate;
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vgmstream->num_samples = dsp_bytes_to_samples(data_size, channels);
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vgmstream->coding_type = is_subinterleave ? coding_NGC_DSP_subint : coding_NGC_DSP;
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vgmstream->layout_type = is_subinterleave ? layout_none : layout_interleave;
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vgmstream->interleave_block_size = is_subinterleave ? 0x01 : 0x8000;
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dsp_read_coefs_be(vgmstream, sf, 0x10, 0x20);
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/* 0x50: initial ps for ch1/2 (16b) */
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/* 0x54: hist? (always blank) */
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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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static int check_subinterleave(STREAMFILE* sf, uint32_t offset) {
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int test_frames = 50;
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uint32_t size = get_streamfile_size(sf);
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/* DSP frame headers can't go past certain values, while nibbles can, so check that supposed headers are so */
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while (test_frames >= 0 && offset < size) {
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uint8_t h2 = read_u8(offset + 0x01,sf); /* only need to test header for 2nd channel */
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/* ignore blank frames */
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if (h2 != 0x00) {
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uint8_t factor = (h2 >> 0) & 0xF; /* not sure about actual max but 0x0b is max usually */
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uint8_t index = (h2 >> 4) & 0xF;
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if (factor > 0x0c || index > 8)
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return 0;
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test_frames--;
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}
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offset += 0x10;
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}
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/* too many blanks */
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if (test_frames > 0)
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return 0;
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return 1;
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} |