mirror of
https://github.com/vgmstream/vgmstream.git
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123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
#include "meta.h"
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#include "../util.h"
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/* VGS (Phantom of Inferno)
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This format is used in _many_ Princess Soft games.
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*/
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VGMSTREAM * init_vgmstream_ps2_vgs(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[PATH_LIMIT];
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size_t fileLength;
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off_t readOffset = 0;
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off_t start_offset;
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off_t loop_start_offset;
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off_t loop_end_offset;
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uint8_t testBuffer[0x10];
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int loop_flag = 0;
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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("vgs",filename_extension(filename))) goto fail;
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/* check header */
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if (read_32bitBE(0x00,streamFile) != 0x56475300)
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goto fail;
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// get file length
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fileLength = get_streamfile_size(streamFile);
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// Find loop start
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do {
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readOffset += (off_t)read_streamfile(testBuffer, readOffset, 0x10, streamFile);
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// Loop Start ...
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if(testBuffer[0x01] == 0x06)
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{
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loop_start_offset = readOffset - 0x10;
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break;
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}
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} while (streamFile->get_offset(streamFile)<((int32_t)fileLength));
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// start at last line of file and move up
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readOffset = (int32_t)fileLength - 0x10;
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// Find loop end
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do {
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readOffset -= (off_t)read_streamfile(testBuffer, readOffset, 0x10, streamFile);
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// Loop End ...
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if((testBuffer[0x01]==0x03) && (testBuffer[0x03]!=0x77))
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{
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loop_end_offset = readOffset + 0x20;
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break;
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}
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} while (readOffset > 0);
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// setup loops
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if (loop_start_offset > 0)
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{
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loop_flag = 1;
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// if we have a start loop, use EOF if end loop is not found
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if (loop_end_offset == 0)
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{
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loop_end_offset = (int32_t)fileLength - 0x10;
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}
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}
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else
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{
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loop_flag = 0;
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}
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channel_count = 2;
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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 = 0x30;
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vgmstream->channels = channel_count;
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vgmstream->sample_rate = read_32bitBE(0x10,streamFile);
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vgmstream->coding_type = coding_PSX;
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vgmstream->num_samples = ((get_streamfile_size(streamFile)-0x30)/16/channel_count*28);
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if (loop_flag)
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{
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vgmstream->loop_start_sample = loop_start_offset/16/channel_count*28;
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vgmstream->loop_end_sample = loop_end_offset/16/channel_count*28;
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}
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = read_32bitBE(0x04,streamFile)*0x1000;
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vgmstream->meta_type = meta_PS2_VGS;
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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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/* 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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