mirror of
https://github.com/vgmstream/vgmstream.git
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74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
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#include "meta.h"
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#include "../coding/coding.h"
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#include "../layout/layout.h"
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#include "../util.h"
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/* Otomedius OTM (Arcade) */
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VGMSTREAM * init_vgmstream_otm(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[PATH_LIMIT];
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off_t start_offset;
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int loop_flag;
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int channel_count;
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/* check extension, case insensitive */
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streamFile->get_name(streamFile,filename,sizeof(filename));
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if (strcasecmp("otm",filename_extension(filename))) goto fail;
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/* check header */
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if (read_32bitBE(0x20,streamFile) != 0x10B10200)
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goto fail;
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if (read_32bitBE(0x24,streamFile) != 0x04001000)
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goto fail;
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if (read_32bitBE(0x14,streamFile) != 0x00000000)
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loop_flag = 1;
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else
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loop_flag = 0;
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channel_count = read_16bitLE(0x1A,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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/* fill in the vital statistics */
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start_offset = 0x2C;
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vgmstream->num_samples = (get_streamfile_size(streamFile)- start_offset)/channel_count/2;
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vgmstream->channels = channel_count;
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vgmstream->sample_rate = read_32bitLE(0x1C,streamFile);
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if (loop_flag) {
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vgmstream->loop_start_sample = (read_32bitLE(0x10,streamFile))/channel_count/2;
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vgmstream->loop_end_sample = (read_32bitLE(0xC,streamFile) - start_offset)/channel_count/2;
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}
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vgmstream->coding_type = coding_PCM16LE;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = 2;
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vgmstream->meta_type = meta_OTM;
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/* open the file for reading */
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{
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int i;
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STREAMFILE * file;
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file = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!file) goto fail;
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for (i=0;i<channel_count;i++) {
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vgmstream->ch[i].streamfile = file;
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vgmstream->ch[i].channel_start_offset=
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vgmstream->ch[i].offset=start_offset+
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vgmstream->interleave_block_size*i;
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}
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}
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return vgmstream;
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fail:
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/* clean up anything we may have opened */
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if (vgmstream) close_vgmstream(vgmstream);
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return NULL;
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}
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