mirror of
https://github.com/vgmstream/vgmstream.git
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49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
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#include "meta.h"
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#include "../coding/coding.h"
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/* DERF - from Stupid Invaders (PC) */
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VGMSTREAM * init_vgmstream_derf(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset;
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int loop_flag, channel_count;
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size_t data_size;
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/* checks */
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if (!check_extensions(streamFile, "adp"))
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goto fail;
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if (read_32bitBE(0x00,streamFile) != 0x44455246) /* "DERF" */
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goto fail;
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channel_count = read_32bitLE(0x04,streamFile);
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if (channel_count > 2) goto fail;
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/* movie DERF also exist with slightly different header */
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start_offset = 0x0c;
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data_size = read_32bitLE(0x08,streamFile);
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if (data_size + start_offset != get_streamfile_size(streamFile))
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goto fail;
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loop_flag = 0;
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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 = 22050;
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vgmstream->meta_type = meta_DERF;
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vgmstream->coding_type = coding_DERF;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = 0x01;
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vgmstream->num_samples = data_size / channel_count; /* bytes-to-samples */
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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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