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https://github.com/vgmstream/vgmstream.git
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f6417c5430
There is not no real about having small-ish buffers, simplifies buffer tuning, and avoids having gigantic buffers on bad reads.
71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
#include "meta.h"
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#include "../util.h"
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VGMSTREAM * init_vgmstream_stx(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[PATH_LIMIT];
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const int loop_flag = 0;
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const int channel_count = 2; /* .stx seems to be stereo only */
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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("stx",filename_extension(filename))) goto fail;
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/* length of data */
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if (read_32bitBE(0x00,streamFile) !=
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get_streamfile_size(streamFile) - 0x20) goto fail;
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/* bits per sample? */
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if (read_16bitBE(0x0a,streamFile) != 4) goto fail;
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/* samples per frame? */
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if (read_16bitBE(0x0c,streamFile) != 0x10) goto fail;
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/* ?? */
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if (read_16bitBE(0x0e,streamFile) != 0x1E) goto fail;
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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 = read_32bitBE(0x04,streamFile);
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vgmstream->sample_rate = (uint16_t)read_16bitBE(0x08,streamFile);
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/* channels and loop flag are set by allocate_vgmstream */
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vgmstream->coding_type = coding_NGC_AFC;
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vgmstream->layout_type = layout_interleave;
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vgmstream->meta_type = meta_STX;
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/* frame-level interleave (9 bytes) */
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vgmstream->interleave_block_size = 9;
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/* open the file for reading by each channel */
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{
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STREAMFILE *chstreamfile;
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int i;
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/* both channels use same buffer, as interleave is so small */
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chstreamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!chstreamfile) goto fail;
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for (i=0;i<channel_count;i++) {
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vgmstream->ch[i].streamfile = chstreamfile;
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vgmstream->ch[i].channel_start_offset=
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vgmstream->ch[i].offset=
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0x20 + i*vgmstream->interleave_block_size;
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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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