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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.
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
#include "meta.h"
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#include "../util.h"
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/* GMS
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PSX GMS format has no recognition ID.
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This format was used essentially in Grandia Games but
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can be easily used by other header format as the format of the header is very simple
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known extensions : GMS
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2008-05-19 - Fastelbja : First version ...
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*/
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VGMSTREAM * init_vgmstream_psx_gms(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[PATH_LIMIT];
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int loop_flag=0;
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int channel_count;
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off_t start_offset;
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int i;
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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("gms",filename_extension(filename))) goto fail;
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/* check loop */
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loop_flag = (read_32bitLE(0x20,streamFile)==0);
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/* Always stereo files */
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channel_count=read_32bitLE(0x00,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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vgmstream->channels = channel_count;
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vgmstream->sample_rate = read_32bitLE(0x04,streamFile);
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vgmstream->coding_type = coding_PSX;
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vgmstream->num_samples = read_32bitLE(0x1C,streamFile);
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/* Get loop point values */
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if(vgmstream->loop_flag) {
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vgmstream->loop_start_sample = read_32bitLE(0x14,streamFile);
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vgmstream->loop_end_sample = read_32bitLE(0x1C,streamFile);
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}
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = 0x800;
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vgmstream->meta_type = meta_PSX_GMS;
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start_offset = 0x800;
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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,STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!vgmstream->ch[i].streamfile) goto fail;
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vgmstream->ch[i].channel_start_offset=
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vgmstream->ch[i].offset=
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(off_t)(start_offset+vgmstream->interleave_block_size*i);
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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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