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https://github.com/vgmstream/vgmstream.git
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cleanup
- 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
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bnnm
parent
82ee723a19
commit
887af76ef6
@ -1157,7 +1157,7 @@ static const meta_info meta_info_list[] = {
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{meta_PS2_WB, "Shooting Love. ~TRIZEAL~ WB header"},
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{meta_S14, "Namco .S14 raw header"},
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{meta_SSS, "Namco .SSS raw header"},
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{meta_PS2_GCM, "GCM 'MCG' Header"},
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{meta_PS2_GCM, "Namco GCM header"},
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{meta_PS2_SMPL, "Homura SMPL header"},
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{meta_PS2_MSA, "Success .MSA header"},
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{meta_NGC_PDT, "Hudson .PDT header"},
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@ -1,125 +1,78 @@
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#include "meta.h"
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#include "../util.h"
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#include "../coding/coding.h"
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/* .GCM - from select Namco games released in around the PS2 era [Gunvari Collection + Time Crisis (PS2), NamCollection (PS2)] */
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VGMSTREAM* init_vgmstream_ps2_gcm(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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off_t start_offset;
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uint32_t vagp_l_offset, vagp_r_offset, gcm_samples, data_size, gcm_sample_rate, gcm_channels;
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/* checks */
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/* .gcm: actual extension. */
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if (!check_extensions(sf, "gcm"))
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goto fail;
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/* check header */
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if (read_u32be(0x00,sf) != 0x4D434700) /* "MCG" */
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goto fail;
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/* GCM format as Namco outlined it is a hacked VAGp stereo format that can hold 6-channel audio at will.
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* so, first step is to deal with whatever quirks the format might have. */
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vagp_l_offset = read_u32le(0x04, sf); /* "left" VAGp header pointer. */
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if (vagp_l_offset != 0x20)
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goto fail;
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vagp_r_offset = read_u32le(0x08, sf); /* "right" VAGp header pointer. */
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if (vagp_r_offset != 0x50)
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goto fail;
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start_offset = read_u32le(0x0c, sf); /* raw "stereo VAG" data pointer. */
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if (start_offset != 0x80)
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goto fail;
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gcm_samples = read_u32le(0x10, sf); /* size of raw "stereo VAG" data, not exactly correct for multi-channel files as we'll see below. */
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/* second step is to check actual GCM size and decide the "channels" value from there.
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* not helping matters is there's nothing in the GCM header that indicates whether or not this GCM is actually multi-channel in any way.
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* meaning we have to manually support those Klonoa multi-channel files (KLN3182M.GCM, KLN3191M.GCM, etc). */
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data_size = get_streamfile_size(sf) - start_offset;
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if (data_size == (gcm_samples * 3)) {
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/* 6-channel GCM file. */
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gcm_channels = 6;
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}
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else if (data_size == gcm_samples) {
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/* stereo GCM file. */
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gcm_channels = 2;
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}
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else {
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/* there is only one known GCM "multi-channel" setup and it's hacky. */
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goto fail;
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}
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/* what follows are two VAGp headers and raw data, third and final step is to perform sanity checks on them (except the data itself) and go from there. */
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/* VAGp signature field, always present. */
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uint32_t vagp_l_sig, vagp_r_sig, vagp_sig;
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vagp_l_sig = read_u32be(vagp_l_offset, sf);
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vagp_r_sig = read_u32be(vagp_r_offset, sf);
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if (vagp_l_sig != vagp_r_sig) {
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/* check two identical values against each other. */
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goto fail;
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}
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else {
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/* check for "VAGp" value. */
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vagp_sig = vagp_r_sig;
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if (vagp_sig != 0x56414770) goto fail; /* "VAGp" */
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}
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/* VAGp version field, always 4. */
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uint32_t vagp_l_ver, vagp_r_ver, vagp_ver;
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vagp_l_ver = read_u32be(vagp_l_offset + 4, sf);
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vagp_r_ver = read_u32be(vagp_r_offset + 4, sf);
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if (vagp_l_ver != vagp_r_ver) {
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/* check two identical values against each other. */
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goto fail;
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}
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else {
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/* check for "version 4" value. */
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vagp_ver = vagp_r_ver;
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if (vagp_ver != 4) goto fail;
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}
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/* VAGp size field, usually separate per channel and does not cover blank frames at all. */
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uint32_t vagp_l_size, vagp_r_size, vagp_samples;
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vagp_l_size = read_u32be(vagp_l_offset + 12, sf);
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vagp_r_size = read_u32be(vagp_r_offset + 12, sf);
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if (vagp_l_size != vagp_r_size) {
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/* check two identical values against each other. */
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goto fail;
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}
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else {
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/* assign one of the two existing "vag size" values to an entirely new "vag size" variable to be used later. */
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vagp_samples = vagp_r_size;
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}
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/* VAGp sample rate field, usually separate per channel. */
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uint32_t vagp_l_sample_rate, vagp_r_sample_rate;
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vagp_l_sample_rate = read_u32be(vagp_l_offset + 16, sf);
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vagp_r_sample_rate = read_u32be(vagp_r_offset + 16, sf);
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if (vagp_l_sample_rate != vagp_r_sample_rate) {
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/* check two identical values against each other. */
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goto fail;
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}
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else {
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/* assign one of the two existing "sample rate" values to an entirely new "sample rate" variable to be used later. */
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gcm_sample_rate = vagp_r_sample_rate;
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}
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/* build the VGMSTREAM by allocating it to total number of channels and a single loop flag.
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* though loop flag is set to 0. GCM files don't really "loop" by themselves. */
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vgmstream = allocate_vgmstream(gcm_channels,0);
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if (!vgmstream) goto fail;
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/* fill in the vital statistics. */
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vgmstream->meta_type = meta_PS2_GCM;
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vgmstream->sample_rate = gcm_sample_rate;
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vgmstream->num_samples = ps_bytes_to_samples(vagp_samples, 1);
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vgmstream->coding_type = coding_PSX;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = read_u32le(0x14, sf);
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/* open the file for reading. */
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if (!vgmstream_open_stream(vgmstream, sf, start_offset))
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goto fail;
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return vgmstream;
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/* clean up anything we may have opened. */
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fail:
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close_vgmstream(vgmstream);
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return NULL;
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}
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#include "meta.h"
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#include "../util.h"
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#include "../coding/coding.h"
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/* .GCM - from PS2 Namco games [Gunvari Collection + Time Crisis (PS2), NamCollection (PS2)] */
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VGMSTREAM* init_vgmstream_ps2_gcm(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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uint32_t start_offset, name_offset;
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uint32_t vagp_l_offset, vagp_r_offset, track_size, data_size, channel_size;
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int channels, sample_rate, interleave;
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/* checks */
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if (!is_id32be(0x00,sf, "MCG\0"))
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goto fail;
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/* .gcm: actual extension */
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if (!check_extensions(sf, "gcm"))
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goto fail;
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/* format is two v4 "VAGp" headers then interleaved data (even for 6ch files) */
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vagp_l_offset = read_u32le(0x04, sf);
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if (!is_id32be(vagp_l_offset,sf, "VAGp"))
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goto fail;
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vagp_r_offset = read_u32le(0x08, sf);
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if (!is_id32be(vagp_r_offset,sf, "VAGp"))
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goto fail;
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start_offset = read_u32le(0x0c, sf);
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track_size = read_u32le(0x10, sf); /* stereo size */
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interleave = read_s32le(0x14, sf);
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/* 0x18/1c: null */
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/* nothing in the header indicates multi-channel files (*M.GCM), check expected sizes of stereo pairs */
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data_size = get_streamfile_size(sf) - start_offset;
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if (data_size == (track_size * 3)) {
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channels = 6;
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}
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else if (data_size == track_size) {
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channels = 2;
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}
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else {
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goto fail; /* unknown setup (could also check start frames are null) */
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}
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/* get some values from the VAGp */
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channel_size = read_u32be(vagp_l_offset + 0x0c, sf); /* without padding */
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sample_rate = read_s32be(vagp_l_offset + 0x10, sf);
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name_offset = vagp_l_offset + 0x20; /* both VAGp use the same name (sometimes with an L/R letter) */
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if (channel_size != read_u32be(vagp_r_offset + 0x0c, sf)) /* unlikely... */
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goto fail;
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if (sample_rate != read_u32be(vagp_r_offset + 0x10, sf)) /* unlikely.. */
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goto fail;
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channels, 0);
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if (!vgmstream) goto fail;
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vgmstream->meta_type = meta_PS2_GCM;
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vgmstream->sample_rate = sample_rate;
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vgmstream->num_samples = ps_bytes_to_samples(channel_size, 1);
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vgmstream->coding_type = coding_PSX;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = interleave;
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read_string(vgmstream->stream_name,0x10+1, name_offset,sf);
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if (!vgmstream_open_stream(vgmstream, sf, start_offset))
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goto fail;
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return vgmstream;
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fail:
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close_vgmstream(vgmstream);
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return NULL;
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}
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