mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-24 04:14:50 +01:00
887af76ef6
- use LF instead of CRLF - follow common name and code conventions used in other meta - reduce comment verbosity (should mainly comment unusual points or ) - should declare variables at block level - skip some checks that are unlikely to matter - read stream name
79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
#include "meta.h"
|
|
#include "../util.h"
|
|
#include "../coding/coding.h"
|
|
|
|
/* .GCM - from PS2 Namco games [Gunvari Collection + Time Crisis (PS2), NamCollection (PS2)] */
|
|
VGMSTREAM* init_vgmstream_ps2_gcm(STREAMFILE* sf) {
|
|
VGMSTREAM* vgmstream = NULL;
|
|
uint32_t start_offset, name_offset;
|
|
uint32_t vagp_l_offset, vagp_r_offset, track_size, data_size, channel_size;
|
|
int channels, sample_rate, interleave;
|
|
|
|
|
|
/* checks */
|
|
if (!is_id32be(0x00,sf, "MCG\0"))
|
|
goto fail;
|
|
|
|
/* .gcm: actual extension */
|
|
if (!check_extensions(sf, "gcm"))
|
|
goto fail;
|
|
|
|
|
|
/* format is two v4 "VAGp" headers then interleaved data (even for 6ch files) */
|
|
vagp_l_offset = read_u32le(0x04, sf);
|
|
if (!is_id32be(vagp_l_offset,sf, "VAGp"))
|
|
goto fail;
|
|
vagp_r_offset = read_u32le(0x08, sf);
|
|
if (!is_id32be(vagp_r_offset,sf, "VAGp"))
|
|
goto fail;
|
|
|
|
start_offset = read_u32le(0x0c, sf);
|
|
track_size = read_u32le(0x10, sf); /* stereo size */
|
|
interleave = read_s32le(0x14, sf);
|
|
/* 0x18/1c: null */
|
|
|
|
/* nothing in the header indicates multi-channel files (*M.GCM), check expected sizes of stereo pairs */
|
|
data_size = get_streamfile_size(sf) - start_offset;
|
|
if (data_size == (track_size * 3)) {
|
|
channels = 6;
|
|
}
|
|
else if (data_size == track_size) {
|
|
channels = 2;
|
|
}
|
|
else {
|
|
goto fail; /* unknown setup (could also check start frames are null) */
|
|
}
|
|
|
|
/* get some values from the VAGp */
|
|
channel_size = read_u32be(vagp_l_offset + 0x0c, sf); /* without padding */
|
|
sample_rate = read_s32be(vagp_l_offset + 0x10, sf);
|
|
name_offset = vagp_l_offset + 0x20; /* both VAGp use the same name (sometimes with an L/R letter) */
|
|
|
|
if (channel_size != read_u32be(vagp_r_offset + 0x0c, sf)) /* unlikely... */
|
|
goto fail;
|
|
if (sample_rate != read_u32be(vagp_r_offset + 0x10, sf)) /* unlikely.. */
|
|
goto fail;
|
|
|
|
|
|
/* build the VGMSTREAM */
|
|
vgmstream = allocate_vgmstream(channels, 0);
|
|
if (!vgmstream) goto fail;
|
|
|
|
vgmstream->meta_type = meta_PS2_GCM;
|
|
vgmstream->sample_rate = sample_rate;
|
|
vgmstream->num_samples = ps_bytes_to_samples(channel_size, 1);
|
|
vgmstream->coding_type = coding_PSX;
|
|
vgmstream->layout_type = layout_interleave;
|
|
vgmstream->interleave_block_size = interleave;
|
|
|
|
read_string(vgmstream->stream_name,0x10+1, name_offset,sf);
|
|
|
|
if (!vgmstream_open_stream(vgmstream, sf, start_offset))
|
|
goto fail;
|
|
return vgmstream;
|
|
|
|
fail:
|
|
close_vgmstream(vgmstream);
|
|
return NULL;
|
|
}
|