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Setup BGW decryption directly in meta using custom streamfiles

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bnnm 2018-01-27 12:50:25 +01:00
parent 8b5d26bcd8
commit 72d0151530
1 changed files with 79 additions and 24 deletions
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103
src/meta/bgw.c
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@ -1,9 +1,14 @@
#include "meta.h"
#include "../coding/coding.h"
static STREAMFILE* setup_bgw_atrac3_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, size_t frame_size, int channels);
/* BGW - from Final Fantasy XI (PC) music files */
VGMSTREAM * init_vgmstream_bgw(STREAMFILE *streamFile) {
VGMSTREAM * vgmstream = NULL;
STREAMFILE *temp_streamFile = NULL;
uint32_t codec, file_size, block_size, sample_rate, block_align;
int32_t loop_start;
off_t start_offset;
@ -32,18 +37,15 @@ VGMSTREAM * init_vgmstream_bgw(STREAMFILE *streamFile) {
channel_count = read_8bit(0x2e,streamFile);
block_align = read_8bit(0x2f,streamFile);
/* check file size with header value */
if (file_size != get_streamfile_size(streamFile))
goto fail;
loop_flag = (loop_start > 0);
/* build the VGMSTREAM */
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(channel_count,loop_flag);
if (!vgmstream) goto fail;
/* fill in the vital statistics */
vgmstream->meta_type = meta_FFXI_BGW;
vgmstream->sample_rate = sample_rate;
@ -65,7 +67,7 @@ VGMSTREAM * init_vgmstream_bgw(STREAMFILE *streamFile) {
case 3: { /* ATRAC3 (encrypted) */
uint8_t buf[0x100];
int bytes, joint_stereo, skip_samples;
ffmpeg_custom_config cfg;
size_t data_size = file_size - start_offset;
vgmstream->num_samples = block_size; /* atrac3_bytes_to_samples gives the same value */
if (loop_flag) {
@ -77,18 +79,18 @@ VGMSTREAM * init_vgmstream_bgw(STREAMFILE *streamFile) {
joint_stereo = 0;
skip_samples = 0;
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);
bytes = ffmpeg_make_riff_atrac3(buf, 0x100, vgmstream->num_samples, data_size, vgmstream->channels, vgmstream->sample_rate, block_align, joint_stereo, skip_samples);
if (bytes <= 0) goto fail;
memset(&cfg, 0, sizeof(ffmpeg_custom_config));
cfg.type = FFMPEG_BGW_ATRAC3;
cfg.channels = vgmstream->channels;
temp_streamFile = setup_bgw_atrac3_streamfile(streamFile, start_offset,data_size, 0xC0,channel_count);
if (!temp_streamFile) goto fail;
vgmstream->codec_data = init_ffmpeg_config(streamFile, buf,bytes, start_offset,file_size - start_offset, &cfg);
vgmstream->codec_data = init_ffmpeg_header_offset(temp_streamFile, buf,bytes, 0,data_size);
if (!vgmstream->codec_data) goto fail;
vgmstream->coding_type = coding_FFmpeg;
vgmstream->layout_type = layout_none;
close_streamfile(temp_streamFile);
break;
}
#endif
@ -98,17 +100,17 @@ VGMSTREAM * init_vgmstream_bgw(STREAMFILE *streamFile) {
}
/* open the file for reading */
if ( !vgmstream_open_stream(vgmstream, streamFile, start_offset) )
goto fail;
return vgmstream;
fail:
close_streamfile(temp_streamFile);
close_vgmstream(vgmstream);
return NULL;
}
/* SPW (SEWave) - from PlayOnline viewer for Final Fantasy XI (PC) */
VGMSTREAM * init_vgmstream_spw(STREAMFILE *streamFile) {
VGMSTREAM * vgmstream = NULL;
@ -118,8 +120,8 @@ VGMSTREAM * init_vgmstream_spw(STREAMFILE *streamFile) {
int channel_count, loop_flag = 0;
/* check extensions */
if ( !check_extensions(streamFile, "spw") )
/* check extensions */
if ( !check_extensions(streamFile, "spw") )
goto fail;
/* check header */
@ -127,10 +129,6 @@ VGMSTREAM * init_vgmstream_spw(STREAMFILE *streamFile) {
read_32bitBE(4,streamFile) != 0x76650000) /* "ve\0\0" */
goto fail;
/* check file size with header value */
if (read_32bitLE(0x8,streamFile) != get_streamfile_size(streamFile))
goto fail;
file_size = read_32bitLE(0x08,streamFile);
codec = read_32bitLE(0x0c,streamFile);
/*file_id = read_32bitLE(0x10,streamFile);*/
@ -144,17 +142,15 @@ VGMSTREAM * init_vgmstream_spw(STREAMFILE *streamFile) {
block_align = read_8bit(0x2b,streamFile);
/*0x2c: unk (0x01 when PCM, 0x10 when VAG?) */
/* check file size with header value */
if (file_size != get_streamfile_size(streamFile))
goto fail;
loop_flag = (loop_start > 0);
/* build the VGMSTREAM */
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(channel_count,loop_flag);
if (!vgmstream) goto fail;
/* fill in the vital statistics */
vgmstream->meta_type = meta_FFXI_SPW;
vgmstream->sample_rate = sample_rate;
@ -171,7 +167,7 @@ VGMSTREAM * init_vgmstream_spw(STREAMFILE *streamFile) {
}
break;
case 1: /* PCM */
vgmstream->coding_type = coding_PCM16LE;
vgmstream->layout_type = layout_interleave;
@ -182,8 +178,9 @@ VGMSTREAM * init_vgmstream_spw(STREAMFILE *streamFile) {
vgmstream->loop_start_sample = (loop_start-1);
vgmstream->loop_end_sample = vgmstream->num_samples;
}
break;
default:
goto fail;
}
@ -199,3 +196,61 @@ fail:
close_vgmstream(vgmstream);
return NULL;
}
#define BGW_KEY_MAX (0xC0*2)
typedef struct {
uint8_t key[BGW_KEY_MAX];
size_t key_size;
} bgw_decryption_data;
/* Encrypted ATRAC3 info from Moogle Toolbox (https://sourceforge.net/projects/mogbox/) */
static size_t bgw_decryption_read(STREAMFILE *streamfile, uint8_t *dest, off_t offset, size_t length, bgw_decryption_data* data) {
size_t bytes_read;
int i;
bytes_read = streamfile->read(streamfile, dest, offset, length);
/* decrypt data (xor) */
for (i = 0; i < bytes_read; i++) {
dest[i] ^= data->key[(offset + i) % data->key_size];
}
return bytes_read;
}
static STREAMFILE* setup_bgw_atrac3_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, size_t frame_size, int channels) {
STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
bgw_decryption_data io_data = {0};
size_t io_data_size = sizeof(bgw_decryption_data);
int ch;
/* setup decryption with key (first frame + modified channel header) */
if (frame_size*channels == 0 || frame_size*channels > BGW_KEY_MAX) goto fail;
io_data.key_size = read_streamfile(io_data.key, subfile_offset, frame_size*channels, streamFile);
for (ch = 0; ch < channels; ch++) {
uint32_t xor = get_32bitBE(io_data.key + frame_size*ch);
put_32bitBE(io_data.key + frame_size*ch, xor ^ 0xA0024E9F);
}
/* setup subfile */
new_streamFile = open_wrap_streamfile(streamFile);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
new_streamFile = open_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
new_streamFile = open_io_streamfile(temp_streamFile, &io_data,io_data_size, bgw_decryption_read);
if (!new_streamFile) goto fail;
temp_streamFile = new_streamFile;
return temp_streamFile;
fail:
close_streamfile(temp_streamFile);
return NULL;
}