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PS2 VGS - Add simple loop searching. Not sure if I need to subtract 0x30 bytes header?

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git-svn-id: https://vgmstream.svn.sourceforge.net/svnroot/vgmstream@880 51a99a44-fe44-0410-b1ba-c3e57ba2b86b
This commit is contained in:
snakemeat 2010-11-16 02:47:10 +00:00
parent 3ea0cd0cae
commit 2f61f9c58a
1 changed files with 63 additions and 10 deletions
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71
src/meta/ps2_vgs.c
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@ -5,8 +5,15 @@
VGMSTREAM * init_vgmstream_ps2_vgs(STREAMFILE *streamFile) {
VGMSTREAM * vgmstream = NULL;
char filename[260];
off_t start_offset;
int loop_flag = 0;
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 */
@ -14,12 +21,56 @@ VGMSTREAM * init_vgmstream_ps2_vgs(STREAMFILE *streamFile) {
if (strcasecmp("vgs",filename_extension(filename))) goto fail;
/* check header */
/* Look if there's more than 1 one file... */
if (read_32bitBE(0x00,streamFile) != 0x56475300)
goto fail;
loop_flag = 0;
// 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 */
@ -32,10 +83,12 @@ VGMSTREAM * init_vgmstream_ps2_vgs(STREAMFILE *streamFile) {
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 = 0;
// vgmstream->loop_end_sample = (read_32bitLE(0x08,streamFile))/channel_count/32*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;