vgmstream/src/meta/ps2_vgs.c

123 lines
3.1 KiB
C

#include "meta.h"
#include "../util.h"
/* VGS (Phantom of Inferno)
This format is used in _many_ Princess Soft games.
*/
VGMSTREAM * init_vgmstream_ps2_vgs(STREAMFILE *streamFile) {
VGMSTREAM * vgmstream = NULL;
char filename[PATH_LIMIT];
size_t fileLength;
off_t readOffset = 0;
off_t start_offset;
off_t loop_start_offset;
off_t loop_end_offset;
uint8_t testBuffer[0x10];
int loop_flag = 0;
int channel_count;
/* check extension, case insensitive */
streamFile->get_name(streamFile,filename,sizeof(filename));
if (strcasecmp("vgs",filename_extension(filename))) goto fail;
/* check header */
if (read_32bitBE(0x00,streamFile) != 0x56475300)
goto fail;
// get file length
fileLength = get_streamfile_size(streamFile);
// Find loop start
do {
readOffset += (off_t)read_streamfile(testBuffer, readOffset, 0x10, streamFile);
// Loop Start ...
if(testBuffer[0x01] == 0x06)
{
loop_start_offset = readOffset - 0x10;
break;
}
} while (streamFile->get_offset(streamFile)<((int32_t)fileLength));
// start at last line of file and move up
readOffset = (int32_t)fileLength - 0x10;
// Find loop end
do {
readOffset -= (off_t)read_streamfile(testBuffer, readOffset, 0x10, streamFile);
// Loop End ...
if((testBuffer[0x01]==0x03) && (testBuffer[0x03]!=0x77))
{
loop_end_offset = readOffset + 0x20;
break;
}
} while (readOffset > 0);
// setup loops
if (loop_start_offset > 0)
{
loop_flag = 1;
// if we have a start loop, use EOF if end loop is not found
if (loop_end_offset == 0)
{
loop_end_offset = (int32_t)fileLength - 0x10;
}
}
else
{
loop_flag = 0;
}
channel_count = 2;
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(channel_count,loop_flag);
if (!vgmstream) goto fail;
/* fill in the vital statistics */
start_offset = 0x30;
vgmstream->channels = channel_count;
vgmstream->sample_rate = read_32bitBE(0x10,streamFile);
vgmstream->coding_type = coding_PSX;
vgmstream->num_samples = ((get_streamfile_size(streamFile)-0x30)/16/channel_count*28);
if (loop_flag)
{
vgmstream->loop_start_sample = loop_start_offset/16/channel_count*28;
vgmstream->loop_end_sample = loop_end_offset/16/channel_count*28;
}
vgmstream->layout_type = layout_interleave;
vgmstream->interleave_block_size = read_32bitBE(0x04,streamFile)*0x1000;
vgmstream->meta_type = meta_PS2_VGS;
/* open the file for reading */
{
int i;
STREAMFILE * file;
file = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
if (!file) goto fail;
for (i=0;i<channel_count;i++) {
vgmstream->ch[i].streamfile = file;
vgmstream->ch[i].channel_start_offset=
vgmstream->ch[i].offset=start_offset+
vgmstream->interleave_block_size*i;
}
}
return vgmstream;
/* clean up anything we may have opened */
fail:
if (vgmstream) close_vgmstream(vgmstream);
return NULL;
}