mirror of
https://github.com/vgmstream/vgmstream.git
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a397d17741
git-svn-id: https://vgmstream.svn.sourceforge.net/svnroot/vgmstream@405 51a99a44-fe44-0410-b1ba-c3e57ba2b86b
102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
#include "meta.h"
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#include "../layout/layout.h"
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#include "../util.h"
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/* Gurumin .de2 */
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/* A ways into the file we have a fake RIFF header wrapping MS ADPCM */
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VGMSTREAM * init_vgmstream_de2(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[260];
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off_t riff_off;
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int channel_count;
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int sample_count;
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int sample_rate;
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off_t start_offset;
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int loop_flag = 0;
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uint32_t data_size;
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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("de2",filename_extension(filename))) goto fail;
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/* still not sure what this is for, but consistently 0xb */
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if (read_32bitLE(0x04,streamFile)!=0xb) goto fail;
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/* legitimate! really! */
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riff_off = 0x10 +
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(read_32bitLE(0x0c,streamFile) ^ read_32bitLE(0x04,streamFile));
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/* check header */
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if ((uint32_t)read_32bitBE(riff_off+0,streamFile)!=0x52494646) /* "RIFF" */
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goto fail;
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/* check for WAVE form */
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if ((uint32_t)read_32bitBE(riff_off+8,streamFile)!=0x57415645) /* "WAVE" */
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goto fail;
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/* check for "fmt " */
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if ((uint32_t)read_32bitBE(riff_off+12,streamFile)!=0x666d7420) /* "fmt " */
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goto fail;
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/* check for "data" */
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if ((uint32_t)read_32bitBE(riff_off+0x24,streamFile)!=0x64617461) /* "data" */
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goto fail;
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/* check for bad fmt chunk size */
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if (read_32bitLE(riff_off+0x10,streamFile)!=0x12) goto fail;
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sample_rate = read_32bitLE(riff_off+0x18,streamFile);
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channel_count = read_16bitLE(riff_off+0x16,streamFile);
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if (channel_count != 2) goto fail;
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/* PCM */
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if (read_16bitLE(riff_off+0x14,streamFile) != 1) goto fail;
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/* 16-bit */
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if (read_16bitLE(riff_off+0x20,streamFile) != 4 ||
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read_16bitLE(riff_off+0x22,streamFile) != 16) goto fail;
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start_offset = riff_off + 0x2c;
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data_size = read_32bitLE(riff_off+0x28,streamFile);
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sample_count = data_size/2/channel_count;
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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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vgmstream->num_samples = sample_count;
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vgmstream->sample_rate = sample_rate;
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vgmstream->coding_type = coding_MSADPCM;
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vgmstream->layout_type = layout_de2_blocked;
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vgmstream->interleave_block_size = 0x800;
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vgmstream->meta_type = meta_DE2;
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/* open the file, set up each channel */
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{
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int i;
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vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,
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STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!vgmstream->ch[0].streamfile) goto fail;
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for (i=0;i<channel_count;i++) {
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vgmstream->ch[i].streamfile = vgmstream->ch[0].streamfile;
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}
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}
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/* start me up */
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de2_block_update(start_offset,vgmstream);
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return vgmstream;
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/* clean up anything we may have opened */
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fail:
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if (vgmstream) close_vgmstream(vgmstream);
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return NULL;
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}
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