63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
#include <math.h>
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#include "meta.h"
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#include "../util.h"
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/* DTK - headerless Nintendo GC DTK file [Harvest Moon: Another Wonderful Life (GC), XGRA (GC)] */
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VGMSTREAM* init_vgmstream_dtk(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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off_t start_offset;
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int channels, loop_flag;
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/* checks */
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/* .dtk: standard [XGRA (GC)]
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* .adp: standard [Harvest Moon AWL (GC)]
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* .wav/lwav: Alien Hominid (GC) */
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if (!check_extensions(sf,"dtk,adp,wav,lwav"))
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goto fail;
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/* check valid frames as files have no header, and .adp/wav are common */
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{
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int i, blanks = 0;
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for (i = 0; i < 10; i++) { /* try a bunch of frames */
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/* header 0x00/01 are repeated in 0x02/03 (for error correction?),
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* could also test header values (upper nibble should be 0..3, and lower nibble 0..C) */
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if (read_u8(0x00 + i*0x20,sf) != read_u8(0x02 + i*0x20,sf) ||
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read_u8(0x01 + i*0x20,sf) != read_u8(0x03 + i*0x20,sf))
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goto fail;
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/* silent frame headers are almost always 0x0C, save a few uncommon tracks [Wave Race Blue Storm (GC), 1080 Silver Storm (GC)] */
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if (read_u16be(0x00 + i*0x20,sf) == 0x00)
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blanks++;
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}
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if (blanks > 3)
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goto fail;
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}
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/* DTK (Disc Track) are DVD hardware-decoded streams, always stereo and no loop.
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* Some games fake looping by calling DVD commands to set position with certain timing.
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* Though headerless, format is HW-wired to those specs. */
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channels = 2;
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loop_flag = 0;
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start_offset = 0x00;
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channels, loop_flag);
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if (!vgmstream) goto fail;
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vgmstream->num_samples = get_streamfile_size(sf) / 0x20 * 28;
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vgmstream->sample_rate = 48000; /* due to a GC hardware defect this may be closer to 48043 */
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vgmstream->coding_type = coding_NGC_DTK;
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vgmstream->layout_type = layout_none;
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vgmstream->meta_type = meta_DTK;
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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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