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https://github.com/vgmstream/vgmstream.git
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66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* .PCM - from Lunar: Eternal Blue (Sega CD) */
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VGMSTREAM* init_vgmstream_scd_pcm(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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off_t start_offset;
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int loop_flag, channels;
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/* checks */
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if (!check_extensions(sf, "pcm"))
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goto fail;
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if (read_u16be(0x00,sf) == 0x0002) {
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channels = 1;
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}
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else if (read_u16be(0x00,sf) == 0x0001) {
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channels = 2; /* RP025.PCM, RP039.PCM */
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}
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else {
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goto fail;
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}
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start_offset = 0x800;
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/* extra validations since .pcm it's kinda generic */
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{
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off_t i;
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/* should be empty up to start (~0x0a/~0x10 sometimes has unknown values) */
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for (i = 0x20; i < start_offset; i++) {
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if (read_u8(i, sf) != 0)
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goto fail;
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}
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}
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/* loops start 0 is possible, plus all? files loops
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* (even sfx/voices loop, but those set loop start in silence near the end) */
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loop_flag = (read_u32be(0x06,sf) != 0);
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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->meta_type = meta_SCD_PCM;
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vgmstream->sample_rate = 32500; /* looks correct compared to emu/recordings */
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vgmstream->num_samples = pcm_bytes_to_samples(get_streamfile_size(sf) - start_offset, channels, 8);
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vgmstream->loop_start_sample = read_s32be(0x02,sf)*0x400*2;
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vgmstream->loop_end_sample = read_s32be(0x06,sf)*2;
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vgmstream->coding_type = coding_PCM8_SB;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = 0x800;
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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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