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vgmstream/src/meta/ps2_vag.c
bnnm c7c1564d9f Minor cleanups (no functionality changes) 
- added comments, code alignment for clarity
- renamed some decoders for consistency (ex. eaxa > ea_xa, invert_psx >
psx_bmdx, vgm_adpcm_cfg > psx_cfg)
- removed layout_dkt_interleave (same as nolayout)
- removed skip_last_channel (not used anymore)
- removed meta_DSP_HALP (not used anymore)
2017-01-08 01:09:20 +01:00

295 lines
11 KiB
C
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#include "meta.h"
#include "../util.h"
static int vag_find_loop_offsets(STREAMFILE *streamFile, off_t start_offset, off_t * loop_start, off_t * loop_end);
/**
* VAGp - SDK format, created by Sony's tools (like AIFF2VAG)
*/
VGMSTREAM * init_vgmstream_ps2_vag(STREAMFILE *streamFile) {
VGMSTREAM * vgmstream = NULL;
char filename[PATH_LIMIT];
off_t loopStart = 0;
off_t loopEnd = 0;
uint8_t vagID;
uint32_t version = 0;
size_t filesize = 0, datasize = 0;
size_t interleave;
off_t start_offset;
int loop_flag=0;
int loop_samples_found = 0;
int channel_count=0;
int i;
/* check extension, case insensitive */
streamFile->get_name(streamFile,filename,sizeof(filename));
if (strcasecmp("vag",filename_extension(filename))) goto fail;
/* check VAG Header */
if (((read_32bitBE(0x00,streamFile) & 0xFFFFFF00) != 0x56414700) && /* "VAG\0" */
((read_32bitLE(0x00,streamFile) & 0xFFFFFF00) != 0x56414700))
goto fail;
filesize = get_streamfile_size(streamFile);
/* version used to create the file
* ex: 00000000 = v1.8 PC, 00000002 = v1.3 Mac, 00000003 = v1.6+ Mac, 00000020 = v2.0+ PC */
version = read_32bitBE(0x04,streamFile);
/* 0x08-0c: reserved */
datasize = read_32bitBE(0x0c,streamFile);
/* 0x14-20 reserved */
/* 0x20-30: name (optional) */
/* 0x30: data start (first 0x10 usually 0s to init SPU) */
/* Check for correct channel count and loop flag */
vagID=read_8bit(0x03,streamFile);
switch(vagID) {
case '1': /* "VAG1" (1 channel) [Metal Gear Solid 3] */
channel_count=1;
break;
case '2': /* "VAG2" (2 channels) [Metal Gear Solid 3] */
channel_count=2;
break;
case 'i': /* "VAGi" (interleaved) */
channel_count=2;
break;
case 'V': /* pGAV (little endian / stereo) [Jak 3, Jak X] */
if (read_32bitBE(0x20,streamFile)==0x53746572) /* "Ster" */
channel_count=2;
else
channel_count=1;
break;
case 'p': /* "VAGp" (extended) [most common, ex Ratchet & Clank] */
if ((version <= 0x00000004) && (datasize < filesize / 2)) {
loop_flag=(read_32bitBE(0x14,streamFile)!=0);
channel_count=2;
}
else if (version == 0x00020001) { /* HEVAG */
loop_flag = vag_find_loop_offsets(streamFile, 0x30, &loopStart, &loopEnd);
channel_count = read_8bit(0x1e,streamFile);
if (channel_count == 0)
channel_count = 1; /* ex. Lumines */
}
else {
loop_flag = vag_find_loop_offsets(streamFile, 0x30, &loopStart, &loopEnd);
channel_count = 1;
}
break;
default:
goto fail;
}
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(channel_count,loop_flag);
if (!vgmstream) goto fail;
/* fill in the vital statistics */
vgmstream->coding_type = coding_PSX;
vgmstream->sample_rate = read_32bitBE(0x10,streamFile);
switch(vagID) {
case '1': // VAG1
vgmstream->layout_type=layout_none;
vgmstream->num_samples = datasize / 16 * 28;
interleave = read_32bitLE(0x08,streamFile);
if (interleave != 0) goto fail;
vgmstream->meta_type=meta_PS2_VAG1;
start_offset=0x40; /* 0x30 is extra data in VAG1 */
break;
case '2': // VAG2
vgmstream->layout_type=layout_interleave;
vgmstream->num_samples = datasize / 16 * 28; /* datasize is for 1 channel only in VAG2 */
interleave = 0x800;
vgmstream->meta_type=meta_PS2_VAG2;
start_offset=0x40; /* 0x30 is extra data in VAG2 */
break;
case 'i': // VAGi
vgmstream->layout_type=layout_interleave;
vgmstream->num_samples = datasize / 16 * 28;
interleave = read_32bitLE(0x08,streamFile);
vgmstream->meta_type=meta_PS2_VAGi;
start_offset=0x800;
break;
case 'p': // VAGp
interleave=0x10;
if ((version == 0x00000004) && (datasize < filesize / 2)) {
vgmstream->channels=2;
vgmstream->num_samples = datasize; /* todo test if datasize/16*28? */
if(loop_flag) {
vgmstream->loop_start_sample=read_32bitBE(0x14,streamFile);
vgmstream->loop_end_sample =read_32bitBE(0x18,streamFile);
loop_samples_found = 1;
}
start_offset=0x80;
vgmstream->layout_type=layout_interleave;
vgmstream->meta_type=meta_PS2_VAGs;
// Double VAG Header @ 0x0000 & 0x1000
if(read_32bitBE(0,streamFile)==read_32bitBE(0x1000,streamFile)) {
vgmstream->num_samples = datasize / 16 * 28;
interleave=0x1000;
start_offset=0;
}
}
else if (version == 0x40000000) { /* Guerilla VAG (little endian) */
datasize = read_32bitLE(0x0c,streamFile);
vgmstream->sample_rate = read_32bitLE(0x10,streamFile);
vgmstream->layout_type=layout_none;
vgmstream->meta_type=meta_PS2_VAGp;
vgmstream->num_samples = datasize / channel_count / 16 * 28;
start_offset = 0x30;
}
else if (version == 0x00020001) { /* HEVAG */
vgmstream->coding_type = coding_HEVAG;
vgmstream->layout_type = layout_interleave;
vgmstream->meta_type = meta_PS2_VAGs;
vgmstream->num_samples = datasize / channel_count / 16 * 28;
start_offset = 0x30;
}
else { /* VAGp, usually separate L/R files */
vgmstream->layout_type=layout_none;
vgmstream->meta_type=meta_PS2_VAGp;
vgmstream->num_samples = datasize / channel_count / 16 * 28;
start_offset=0x30;
}
break;
case 'V': // pGAV
vgmstream->layout_type=layout_interleave;
interleave=0x2000; /* Jak 3 interleave, includes header */
if(read_32bitLE(0x1000,streamFile)==0x56414770) /* "pGAV" */
interleave=0x1000; /* Jak X interleave, includes header */
vgmstream->sample_rate = read_32bitLE(0x10,streamFile);
vgmstream->num_samples = read_32bitLE(0x0C,streamFile)/16*14;
vgmstream->meta_type=meta_PS2_pGAV;
start_offset=0;
break;
default:
goto fail;
}
vgmstream->interleave_block_size=interleave;
/* Don't add the header size to loop calc points */
if(loop_flag && !loop_samples_found) {
loopStart-=start_offset;
loopEnd-=start_offset;
vgmstream->loop_start_sample = (int32_t)((loopStart/(interleave*channel_count))*interleave)/16*28;
vgmstream->loop_start_sample += (int32_t)(loopStart%(interleave*channel_count))/16*28;
vgmstream->loop_end_sample = (int32_t)((loopEnd/(interleave*channel_count))*interleave)/16*28;
vgmstream->loop_end_sample += (int32_t)(loopEnd%(interleave*channel_count))/16*28;
}
/* open the file for reading by each channel */
{
for (i=0;i<channel_count;i++) {
if (vgmstream->interleave_block_size > 0) {
vgmstream->ch[i].streamfile = streamFile->open(streamFile,filename,vgmstream->interleave_block_size);
} else {
vgmstream->ch[i].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
}
if (!vgmstream->ch[i].streamfile) goto fail;
vgmstream->ch[i].channel_start_offset=
vgmstream->ch[i].offset=
(off_t)(start_offset+vgmstream->interleave_block_size*i);
}
}
return vgmstream;
/* clean up anything we may have opened */
fail:
if (vgmstream) close_vgmstream(vgmstream);
return NULL;
}
/**
* Finds loop points in VAG data using flag markers and updates loop_start and loop_end with the global offsets.
*
* returns 0 if not found
*/
static int vag_find_loop_offsets(STREAMFILE *streamFile, off_t start_offset, off_t * loop_start, off_t * loop_end) {
off_t loopStart = 0;
off_t loopEnd = 0;
/* used for loop points (todo: variations: 0x0c0700..00, 0x070077..77 ) */
/* 'used to prevent unnecessary SPU interrupts' (optional if no IRQ or no looping) */
uint8_t eofVAG[16]={0x00,0x07,0x77,0x77,0x77,0x77,0x77,0x77,0x77,0x77,0x77,0x77,0x77,0x77,0x77,0x77};
uint8_t eofVAG2[16]={0x00,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
uint8_t readbuf[16];
uint8_t flag;
/* Search for loop in VAG */
size_t fileLength = get_streamfile_size(streamFile);
off_t readOffset = start_offset - 0x10;
do {
readOffset+=0x10;
flag = read_8bit(readOffset+0x01,streamFile) & 0x0F; /* lower nibble (for HEVAG) */
// Loop Start ...
if (flag == 0x06 && !loopStart) {
loopStart = readOffset;
}
// Loop End ...
if (flag == 0x03 && !loopEnd) {
loopEnd = readOffset;
if (loopStart && loopEnd)
break;
}
/* hack for some games that don't have loop points but play the same track on repeat
* (sometimes this will loop non-looping tracks incorrectly)
* if there is a "partial" 0x07 end flag pretend it wants to loop */
if (flag == 0x01) {
// Check if we have a full eof tag after the loop point ...
// if so we don't loop, if not present, we loop from end to start ...
int read = read_streamfile(readbuf,readOffset+0x10,0x10,streamFile);
/* is there valid data after flag 0x1? */
if (read > 0
&& readbuf[0] != 0x00
&& readbuf[0] != 0x0c
&& readbuf[0] != 0x3c /* Ecco the Dolphin, Ratchet & Clank 2 */
) {
if (memcmp(readbuf,eofVAG,0x10) && (memcmp(readbuf,eofVAG2,0x10))) { /* full end flags */
loopStart = start_offset + 0x10; /* todo proper start */
loopEnd = readOffset;
break;
}
}
}
} while (streamFile->get_offset(streamFile)<(off_t)fileLength);
if (loopStart && loopEnd) {
*loop_start = loopStart;
*loop_end = loopEnd;
return 1;
}
return 0;
}
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