mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-11-15 11:07:40 +01:00
Setup BGW decryption directly in meta using custom streamfiles
This commit is contained in:
bnnm
parent
8b5d26bcd8
commit
72d0151530
103
src/meta/bgw.c
103
src/meta/bgw.c
@ -1,9 +1,14 @@
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#include "meta.h"
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#include "../coding/coding.h"
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static STREAMFILE* setup_bgw_atrac3_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, size_t frame_size, int channels);
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/* BGW - from Final Fantasy XI (PC) music files */
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VGMSTREAM * init_vgmstream_bgw(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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STREAMFILE *temp_streamFile = NULL;
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uint32_t codec, file_size, block_size, sample_rate, block_align;
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int32_t loop_start;
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off_t start_offset;
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@ -32,18 +37,15 @@ VGMSTREAM * init_vgmstream_bgw(STREAMFILE *streamFile) {
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channel_count = read_8bit(0x2e,streamFile);
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block_align = read_8bit(0x2f,streamFile);
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/* check file size with header value */
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if (file_size != get_streamfile_size(streamFile))
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goto fail;
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loop_flag = (loop_start > 0);
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/* build the VGMSTREAM */
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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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/* fill in the vital statistics */
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vgmstream->meta_type = meta_FFXI_BGW;
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vgmstream->sample_rate = sample_rate;
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@ -65,7 +67,7 @@ VGMSTREAM * init_vgmstream_bgw(STREAMFILE *streamFile) {
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case 3: { /* ATRAC3 (encrypted) */
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uint8_t buf[0x100];
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int bytes, joint_stereo, skip_samples;
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ffmpeg_custom_config cfg;
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size_t data_size = file_size - start_offset;
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vgmstream->num_samples = block_size; /* atrac3_bytes_to_samples gives the same value */
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if (loop_flag) {
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@ -77,18 +79,18 @@ VGMSTREAM * init_vgmstream_bgw(STREAMFILE *streamFile) {
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joint_stereo = 0;
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skip_samples = 0;
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bytes = ffmpeg_make_riff_atrac3(buf, 0x100, vgmstream->num_samples, file_size - start_offset, vgmstream->channels, vgmstream->sample_rate, block_align, joint_stereo, skip_samples);
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bytes = ffmpeg_make_riff_atrac3(buf, 0x100, vgmstream->num_samples, data_size, vgmstream->channels, vgmstream->sample_rate, block_align, joint_stereo, skip_samples);
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if (bytes <= 0) goto fail;
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memset(&cfg, 0, sizeof(ffmpeg_custom_config));
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cfg.type = FFMPEG_BGW_ATRAC3;
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cfg.channels = vgmstream->channels;
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temp_streamFile = setup_bgw_atrac3_streamfile(streamFile, start_offset,data_size, 0xC0,channel_count);
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if (!temp_streamFile) goto fail;
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vgmstream->codec_data = init_ffmpeg_config(streamFile, buf,bytes, start_offset,file_size - start_offset, &cfg);
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vgmstream->codec_data = init_ffmpeg_header_offset(temp_streamFile, buf,bytes, 0,data_size);
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if (!vgmstream->codec_data) goto fail;
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vgmstream->coding_type = coding_FFmpeg;
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vgmstream->layout_type = layout_none;
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close_streamfile(temp_streamFile);
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break;
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}
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#endif
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@ -98,17 +100,17 @@ VGMSTREAM * init_vgmstream_bgw(STREAMFILE *streamFile) {
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}
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/* open the file for reading */
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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_streamfile(temp_streamFile);
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close_vgmstream(vgmstream);
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return NULL;
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}
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/* SPW (SEWave) - from PlayOnline viewer for Final Fantasy XI (PC) */
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VGMSTREAM * init_vgmstream_spw(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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@ -118,8 +120,8 @@ VGMSTREAM * init_vgmstream_spw(STREAMFILE *streamFile) {
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int channel_count, loop_flag = 0;
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/* check extensions */
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if ( !check_extensions(streamFile, "spw") )
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/* check extensions */
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if ( !check_extensions(streamFile, "spw") )
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goto fail;
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/* check header */
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@ -127,10 +129,6 @@ VGMSTREAM * init_vgmstream_spw(STREAMFILE *streamFile) {
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read_32bitBE(4,streamFile) != 0x76650000) /* "ve\0\0" */
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goto fail;
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/* check file size with header value */
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if (read_32bitLE(0x8,streamFile) != get_streamfile_size(streamFile))
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goto fail;
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file_size = read_32bitLE(0x08,streamFile);
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codec = read_32bitLE(0x0c,streamFile);
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/*file_id = read_32bitLE(0x10,streamFile);*/
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@ -144,17 +142,15 @@ VGMSTREAM * init_vgmstream_spw(STREAMFILE *streamFile) {
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block_align = read_8bit(0x2b,streamFile);
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/*0x2c: unk (0x01 when PCM, 0x10 when VAG?) */
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/* check file size with header value */
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if (file_size != get_streamfile_size(streamFile))
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goto fail;
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loop_flag = (loop_start > 0);
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/* build the VGMSTREAM */
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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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/* fill in the vital statistics */
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vgmstream->meta_type = meta_FFXI_SPW;
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vgmstream->sample_rate = sample_rate;
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@ -171,7 +167,7 @@ VGMSTREAM * init_vgmstream_spw(STREAMFILE *streamFile) {
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}
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break;
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case 1: /* PCM */
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vgmstream->coding_type = coding_PCM16LE;
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vgmstream->layout_type = layout_interleave;
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@ -182,8 +178,9 @@ VGMSTREAM * init_vgmstream_spw(STREAMFILE *streamFile) {
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vgmstream->loop_start_sample = (loop_start-1);
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vgmstream->loop_end_sample = vgmstream->num_samples;
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}
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break;
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default:
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goto fail;
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}
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@ -199,3 +196,61 @@ fail:
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close_vgmstream(vgmstream);
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return NULL;
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}
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#define BGW_KEY_MAX (0xC0*2)
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typedef struct {
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uint8_t key[BGW_KEY_MAX];
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size_t key_size;
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} bgw_decryption_data;
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/* Encrypted ATRAC3 info from Moogle Toolbox (https://sourceforge.net/projects/mogbox/) */
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static size_t bgw_decryption_read(STREAMFILE *streamfile, uint8_t *dest, off_t offset, size_t length, bgw_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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dest[i] ^= data->key[(offset + i) % data->key_size];
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}
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return bytes_read;
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}
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static STREAMFILE* setup_bgw_atrac3_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, size_t frame_size, int channels) {
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STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
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bgw_decryption_data io_data = {0};
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size_t io_data_size = sizeof(bgw_decryption_data);
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int ch;
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/* setup decryption with key (first frame + modified channel header) */
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if (frame_size*channels == 0 || frame_size*channels > BGW_KEY_MAX) goto fail;
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io_data.key_size = read_streamfile(io_data.key, subfile_offset, frame_size*channels, streamFile);
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for (ch = 0; ch < channels; ch++) {
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uint32_t xor = get_32bitBE(io_data.key + frame_size*ch);
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put_32bitBE(io_data.key + frame_size*ch, xor ^ 0xA0024E9F);
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}
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/* setup subfile */
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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_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
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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, bgw_decryption_read);
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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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