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https://github.com/vgmstream/vgmstream.git
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775dac0221
git-svn-id: https://vgmstream.svn.sourceforge.net/svnroot/vgmstream@657 51a99a44-fe44-0410-b1ba-c3e57ba2b86b
70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
#include "meta.h"
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#include "../util.h"
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/* 2DX (found in beatmaniaIIDX16 - EMPRESS (Arcade) */
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VGMSTREAM * init_vgmstream_2dx(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[260];
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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("2dx",filename_extension(filename))) goto fail;
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/* check header */
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if (read_32bitBE(0x0,streamFile) != 0x32445839) /* 2DX9 */
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goto fail;
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if (read_32bitBE(0x18,streamFile) != 0x52494646) /* RIFF */
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goto fail;
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if (read_32bitBE(0x20,streamFile) != 0x57415645) /* WAVE */
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goto fail;
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if (read_32bitBE(0x24,streamFile) != 0x666D7420) /* fmt */
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goto fail;
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if (read_32bitBE(0x6a,streamFile) != 0x64617461) /* data */
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goto fail;
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loop_flag = 0;
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channel_count = read_16bitLE(0x2e,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 = 0x72;
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vgmstream->channels = channel_count;
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vgmstream->sample_rate = read_32bitLE(0x30,streamFile);
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vgmstream->coding_type = coding_MSADPCM;
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vgmstream->num_samples = read_32bitLE(0x66,streamFile);
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vgmstream->layout_type = layout_none;
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vgmstream->interleave_block_size = read_16bitLE(0x38,streamFile);
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vgmstream->meta_type = meta_2DX;
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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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