mirror of
https://github.com/vgmstream/vgmstream.git
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75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
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#include "meta.h"
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#include "../coding/coding.h"
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/* MSF - TamaSoft games [Abandoner: The Severed Dreams (PC)] */
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VGMSTREAM * init_vgmstream_msf_tamasoft(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset;
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int loop_flag, channel_count, sample_rate, codec, loop_start = 0, loop_end = 0;
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size_t data_size;
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uint16_t xor16;
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uint32_t xor32;
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/* checks */
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/* .msf: extension referenced in .EXE (bigfiles don't have filenames) */
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if (!check_extensions(streamFile, "msf"))
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goto fail;
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if (read_32bitBE(0x00,streamFile) != 0x4D534620) /* "MSF " */
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goto fail;
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if (read_32bitBE(0x08,streamFile) != 0x00) /* just in case since there are other .msf */
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goto fail;
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/* header from 0x10 to 0x30 is encrypted (though value at 0x10 doubles as key...) */
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xor16 = (uint16_t)(((uint32_t)read_32bitLE(0x04,streamFile) * 0x65u) + 0x30Au); /* from the exe */
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xor32 = (uint32_t)(((uint32_t)xor16 << 16u) | (uint32_t)xor16);
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/* 0x10: null */
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loop_flag = (uint32_t)read_32bitLE(0x14,streamFile) ^ xor32;
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data_size = (uint32_t)read_32bitLE(0x18,streamFile) ^ xor32;
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codec = (uint16_t)read_16bitLE(0x1c,streamFile) ^ xor16;
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channel_count = (uint16_t)read_16bitLE(0x1e,streamFile) ^ xor16;
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sample_rate = (uint32_t)read_32bitLE(0x20,streamFile) ^ xor32;
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/* 0x24: average bitrate? */
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/* 0x28: block size */
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/* 0x2a: bps */
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/* 0x2c: unknown (fixed) */
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if (loop_flag) {
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loop_start = read_32bitLE(0x30,streamFile);
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loop_end = read_32bitLE(0x34,streamFile);
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/* 0x38/3c: null */
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start_offset = 0x40;
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}
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else {
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start_offset = 0x30;
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}
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if (codec != 0x01)
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goto fail;
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channel_count, loop_flag);
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if (!vgmstream) goto fail;
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vgmstream->meta_type = meta_MSF_TAMASOFT;
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vgmstream->sample_rate = sample_rate;
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vgmstream->num_samples = pcm_bytes_to_samples(data_size, channel_count, 16);
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vgmstream->loop_start_sample = pcm_bytes_to_samples(loop_start, channel_count, 16);
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vgmstream->loop_end_sample = pcm_bytes_to_samples(loop_end, channel_count, 16);
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vgmstream->coding_type = coding_PCM16LE;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = 0x02;
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if (!vgmstream_open_stream(vgmstream,streamFile,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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