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Tweak DTK detection

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bnnm 2020-12-01 23:21:33 +01:00
parent 7437c53545
commit 5adcbc4da5
1 changed files with 22 additions and 13 deletions
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35
src/meta/ngc_adpdtk.c
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@ -3,45 +3,54 @@
#include "../util.h"
/* DTK - headerless Nintendo GC DTK file [Harvest Moon: Another Wonderful Life (GC), XGRA (GC)] */
VGMSTREAM * init_vgmstream_ngc_adpdtk(STREAMFILE *streamFile) {
VGMSTREAM * vgmstream = NULL;
VGMSTREAM* init_vgmstream_ngc_adpdtk(STREAMFILE* sf) {
VGMSTREAM* vgmstream = NULL;
off_t start_offset;
int channel_count, loop_flag;
int channels, loop_flag;
/* checks */
/* .dtk: standard [XGRA (GC)], .adp: standard [Harvest Moon AWL (GC)], .wav/lwav: Alien Hominid (GC) */
if ( !check_extensions(streamFile,"dtk,adp,wav,lwav"))
/* .dtk: standard [XGRA (GC)]
* .adp: standard [Harvest Moon AWL (GC)]
* .wav/lwav: Alien Hominid (GC) */
if (!check_extensions(sf,"dtk,adp,wav,lwav"))
goto fail;
/* check valid frames as files have no header, and .adp/wav are common */
{
int i;
for (i = 0; i < 10; i++) { /* try a bunch of frames */
if (read_8bit(0x00 + i*0x20,streamFile) != read_8bit(0x02 + i*0x20,streamFile) ||
read_8bit(0x01 + i*0x20,streamFile) != read_8bit(0x03 + i*0x20,streamFile))
goto fail;
/* header 0x00/01 are repeated in 0x02/03 (for error correction?),
* could also test header values (upper nibble should be 0..3, and lower nibble 0..C) */
if (read_8bit(0x00 + i*0x20,sf) != read_8bit(0x02 + i*0x20,sf) ||
read_8bit(0x01 + i*0x20,sf) != read_8bit(0x03 + i*0x20,sf))
goto fail;
/* frame headers for silent frames are 0x0C, never null */
if (read_8bit(0x00 + i*0x20,sf) == 0x00)
goto fail;
}
}
/* always stereo, no loop (since it's hardware-decoded and streamed) */
channel_count = 2;
/* DTK (Disc Track) are DVD hardware-decoded streams, always stereo and no loop.
* Some games fake looping by calling DVD commands to set position with certain timing.
* Though headerless, format is HW-wired to those specs. */
channels = 2;
loop_flag = 0;
start_offset = 0x00;
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(channel_count, loop_flag);
vgmstream = allocate_vgmstream(channels, loop_flag);
if (!vgmstream) goto fail;
vgmstream->num_samples = get_streamfile_size(streamFile) / 0x20 * 28;
vgmstream->num_samples = get_streamfile_size(sf) / 0x20 * 28;
vgmstream->sample_rate = 48000; /* due to a GC hardware defect this may be closer to 48043 */
vgmstream->coding_type = coding_NGC_DTK;
vgmstream->layout_type = layout_none;
vgmstream->meta_type = meta_NGC_ADPDTK;
if ( !vgmstream_open_stream(vgmstream, streamFile, start_offset) )
if ( !vgmstream_open_stream(vgmstream, sf, start_offset) )
goto fail;
return vgmstream;