mirror of
https://github.com/vgmstream/vgmstream.git
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52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* MSA - from Psyvariar -Complete Edition- (PS2) */
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VGMSTREAM * init_vgmstream_ps2_msa(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset, data_size, file_size;
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int loop_flag, channel_count;
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/* checks */
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if (!check_extensions(streamFile, "msa"))
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goto fail;
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if (read_32bitBE(0x00,streamFile) != 0x00000000)
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goto fail;
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loop_flag = 0;
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channel_count = 2;
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start_offset = 0x14;
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data_size = read_32bitLE(0x4,streamFile);
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file_size = get_streamfile_size(streamFile);
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channel_count,loop_flag);
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if (!vgmstream) goto fail;
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vgmstream->sample_rate = read_32bitLE(0x10,streamFile);
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if (vgmstream->sample_rate == 0) /* ex. AME.MSA */
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vgmstream->sample_rate = 44100;
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vgmstream->num_samples = ps_bytes_to_samples(data_size, channel_count);//data_size*28/(0x10*channel_count);
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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 = 0x4000;
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vgmstream->meta_type = meta_PS2_MSA;
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/* MSAs are strangely truncated, so manually calculate samples.
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* Data after last usable block is always silence or garbage. */
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if (data_size > file_size) {
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off_t usable_size = file_size - start_offset;
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usable_size -= usable_size % (vgmstream->interleave_block_size*channel_count);/* block-aligned */
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vgmstream->num_samples = ps_bytes_to_samples(usable_size, channel_count);//usable_size * 28 / (16*channel_count);
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}
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if (!vgmstream_open_stream(vgmstream, streamFile, 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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