mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-21 10:55:53 +01:00
117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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static STREAMFILE* setup_bmdx_streamfile(STREAMFILE *streamFile, off_t start_offset, size_t data_size);
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/* .bmdx - from Beatmania IIDX (PS2) games */
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VGMSTREAM * init_vgmstream_ps2_bmdx(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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STREAMFILE *temp_streamFile = NULL;
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off_t start_offset;
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size_t data_size;
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int loop_flag, channel_count, encryption;
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/* checks */
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if (!check_extensions(streamFile, "bmdx"))
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goto fail;
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if (read_32bitBE(0x00,streamFile) != 0x01006408 ||
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read_32bitBE(0x04,streamFile) != 0x00)
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goto fail;
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start_offset = read_32bitLE(0x08,streamFile);
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data_size = read_32bitLE(0x0c,streamFile);
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loop_flag = (read_32bitLE(0x10,streamFile) != 0x00);
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channel_count = read_32bitLE(0x1C,streamFile);
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encryption = (read_32bitLE(0x20,streamFile) == 1);
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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->sample_rate = read_32bitLE(0x18,streamFile);
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vgmstream->num_samples = ps_bytes_to_samples(data_size, channel_count);
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vgmstream->loop_start_sample = ps_bytes_to_samples(read_32bitLE(0x10,streamFile), channel_count);
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vgmstream->loop_end_sample = vgmstream->num_samples;
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vgmstream->meta_type = meta_PS2_BMDX;
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vgmstream->coding_type = coding_PSX;
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vgmstream->layout_type = (channel_count == 1) ? layout_none : layout_interleave;
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vgmstream->interleave_block_size = read_32bitLE(0x24,streamFile);
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/* later games are encrypted [beatmaniaIIDX 14 GOLD (PS2)] */
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if (encryption) {
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temp_streamFile = setup_bmdx_streamfile(streamFile, start_offset, data_size);
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if (!temp_streamFile) goto fail;
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}
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if (!vgmstream_open_stream(vgmstream,encryption ? temp_streamFile : streamFile,start_offset))
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goto fail;
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close_streamfile(temp_streamFile);
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return vgmstream;
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fail:
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close_streamfile(temp_streamFile);
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close_vgmstream(vgmstream);
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return NULL;
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}
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typedef struct {
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uint8_t xor;
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uint8_t add;
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off_t start_offset;
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size_t data_size;
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} bmdx_decryption_data;
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static size_t bmdx_decryption_read(STREAMFILE *streamfile, uint8_t *dest, off_t offset, size_t length, bmdx_decryption_data* data) {
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size_t bytes_read;
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int i;
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bytes_read = streamfile->read(streamfile, dest, offset, length);
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/* decrypt data (xor) */
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for (i = 0; i < bytes_read; i++) {
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if (offset+i >= data->start_offset && offset+i < data->start_offset + data->data_size) {
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if (((offset+i) % 0x10) == 0) /* XOR header byte per frame */
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dest[i] = dest[i] ^ data->xor;
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else if (((offset+i) % 0x10) == 2) /* ADD first data byte per frame */
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dest[i] = (uint8_t)(dest[i] + data->add);
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}
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}
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return bytes_read;
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}
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static STREAMFILE* setup_bmdx_streamfile(STREAMFILE *streamFile, off_t start_offset, size_t data_size) {
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STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
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bmdx_decryption_data io_data = {0};
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size_t io_data_size = sizeof(bmdx_decryption_data);
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/* setup decryption (usually xor=0xFF and add=0x02) */
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io_data.xor = read_8bit(start_offset,streamFile);
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io_data.add = (~(uint8_t)read_8bit(start_offset+2,streamFile)) + 0x01;
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io_data.start_offset = start_offset;
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io_data.data_size = data_size;
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/* setup custom streamfile */
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new_streamFile = open_wrap_streamfile(streamFile);
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if (!new_streamFile) goto fail;
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temp_streamFile = new_streamFile;
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new_streamFile = open_io_streamfile(temp_streamFile, &io_data,io_data_size, bmdx_decryption_read,NULL);
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if (!new_streamFile) goto fail;
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temp_streamFile = new_streamFile;
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return temp_streamFile;
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fail:
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close_streamfile(temp_streamFile);
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return NULL;
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}
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