69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* PCM - from Success (related) games [Metal Saga (PS2), Tetris Kiwamemichi (PS2), Duel Masters: Rebirth of Super Dragon (PS2)] */
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VGMSTREAM* init_vgmstream_pcm_success(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, sample_rate, interleave;
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size_t data_size, loop_start, loop_end, loop_adjust;
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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_u32be(0x00,sf) != 0x50434D20) /* "PCM " */
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goto fail;
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if (read_u32le(0x04,sf) != 0x00010000) /* version? */
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goto fail;
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if (read_u32le(0x08,sf) + 0x8000 < get_streamfile_size(sf)) /* data size without padding */
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goto fail;
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interleave = 0x800;
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start_offset = 0x800;
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sample_rate = read_s32le(0x0c,sf);
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channels = read_s32le(0x10,sf);
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loop_flag = read_s32le(0x14,sf);
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data_size = read_s32le(0x18,sf) * interleave * channels;
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/* loops seems slightly off, so 'adjust' meaning may need to be tweaked */
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loop_adjust = read_s32le(0x1c,sf) * channels; /* from 0..<0x800 */
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loop_start = read_s32le(0x20,sf) * interleave * channels + loop_adjust;
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loop_adjust = read_s32le(0x24,sf) * channels; /* always 0x800 (0 if no loop flag) */
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loop_end = read_s32le(0x28,sf) * interleave * channels + (interleave * channels - loop_adjust);
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/* 0x2c: always 1? */
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/* 0x30/40: padding garbage (also at file end) */
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/* not always accurate and has padding */
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if (data_size > get_streamfile_size(sf) - start_offset)
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data_size = get_streamfile_size(sf) - start_offset;
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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_PCM_SUCCESS;
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vgmstream->sample_rate = sample_rate;
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vgmstream->num_samples = ps_bytes_to_samples(data_size, channels);
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vgmstream->loop_start_sample = ps_bytes_to_samples(loop_start, channels);
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vgmstream->loop_end_sample = ps_bytes_to_samples(loop_end, channels);
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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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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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