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https://github.com/vgmstream/vgmstream.git
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63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* MSA - from Sucess games [Psyvariar -Complete Edition- (PS2), Konohana Pack: 3tsu no Jikenbo (PS2)]*/
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VGMSTREAM* init_vgmstream_msa(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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uint32_t start_offset, data_size, channel_size, file_size;
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int loop_flag, channels;
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/* checks */
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if (read_u32be(0x00,sf) != 0x00000000 || read_u32be(0x08,sf) != 0x00000000)
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return NULL;
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if (!check_extensions(sf, "msa"))
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return NULL;
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loop_flag = 0;
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channels = 2;
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start_offset = 0x14;
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file_size = get_streamfile_size(sf);
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data_size = read_u32le(0x04,sf); /* wrong, see below */
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channel_size = read_u32le(0x0c,sf); /* also wrong like data_size */
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if (!ps_check_format(sf, start_offset, 0x100))
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return NULL;
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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_MSA;
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vgmstream->sample_rate = read_s32le(0x10,sf);
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if (vgmstream->sample_rate == 0) /* ex. Psyvariar's AME.MSA */
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vgmstream->sample_rate = 44100;
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vgmstream->num_samples = ps_bytes_to_samples(data_size, channels);
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vgmstream->coding_type = coding_PSX;
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vgmstream->layout_type = layout_interleave;
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if (channel_size) /* Konohana Pack */
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vgmstream->interleave_block_size = 0x6000;
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else /* Psyvariar */
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vgmstream->interleave_block_size = 0x4000;
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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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uint32_t usable_size = file_size - start_offset;
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usable_size -= usable_size % (vgmstream->interleave_block_size * channels); /* block-aligned */
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vgmstream->num_samples = ps_bytes_to_samples(usable_size, channels);
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}
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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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