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https://github.com/vgmstream/vgmstream.git
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92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
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//MxSt files ripped from Jukebox.si in Lego Island
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#include "meta.h"
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#include "../util.h"
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//counts the number of audio data bytes.
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//any way to speed this up?
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static size_t getNumBytes(off_t offset,STREAMFILE* streamFile) {
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off_t j;
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size_t siz = 0;
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for(j=offset;j<get_streamfile_size(streamFile);j+=2)
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{
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if(read_32bitBE(j,streamFile)==0x4d784368)//look for MxCh
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{
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if(read_32bitBE(j+4,streamFile)!=0x4d784368)
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siz += read_32bitLE( j + 18, streamFile);
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}
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}
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return siz;
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}
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VGMSTREAM * init_vgmstream_pc_mxst(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[260];
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int loop_flag=0;
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int bitrate=2;
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int channel_count;
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int i;
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off_t j;
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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("mxst",filename_extension(filename))) goto fail;
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/* looping info not found yet */
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loop_flag = get_streamfile_size(streamFile) > 700000;
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/* Always mono files */
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channel_count=1;
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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->channels = 1;
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vgmstream->sample_rate = 11025;
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vgmstream->layout_type = layout_mxch_blocked;
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vgmstream->meta_type = meta_PC_MXST;
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for(j=0;j<get_streamfile_size(streamFile);j++)
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{
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if(read_32bitBE(j,streamFile)==0x4D784461)//look for MxDa
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break;
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}
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if(8==read_8bit(40+j,streamFile))
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{
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vgmstream->coding_type = coding_PCM8_U;
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bitrate=1;
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}
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else
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{
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vgmstream->coding_type = coding_PCM16LE;
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}
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if(j==get_streamfile_size(streamFile))
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goto fail;
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j+=4;
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vgmstream->current_block_offset=0;
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vgmstream->next_block_offset=j;
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vgmstream->num_samples = getNumBytes(j,streamFile) / bitrate / vgmstream->channels;
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if(loop_flag)
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{
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vgmstream->loop_start_sample = 0;
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vgmstream->loop_end_sample=vgmstream->num_samples;
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}
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/* open the file for reading by each channel */
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{
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for (i=0;i<channel_count;i++) {
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vgmstream->ch[i].streamfile = streamFile->open(streamFile,filename,j);
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if (!vgmstream->ch[i].streamfile) goto fail;
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}
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}
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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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