mirror of
https://github.com/vgmstream/vgmstream.git
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53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
#include "meta.h"
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#include "../util.h"
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/* MSA (from Psyvariar -Complete Edition-) */
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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, datasize, filesize;
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int loop_flag, channel_count;
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/* check extension, case insensitive */
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if (!check_extensions(streamFile, "msa")) goto fail;
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/* check header */
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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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/* 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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start_offset = 0x14;
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datasize = read_32bitLE(0x4,streamFile);
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filesize = get_streamfile_size(streamFile);
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vgmstream->channels = channel_count;
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vgmstream->sample_rate = read_32bitLE(0x10,streamFile);
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vgmstream->num_samples = datasize*28/(16*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 (datasize > filesize) {
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off_t usable_size = filesize - 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 = usable_size * 28 / (16*channel_count);
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}
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/* open the file for reading */
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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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