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9cf9416665
Currently same as ms_ima_bytes_to_samples, but this will change; renamed for consistency with all other IMA variations. Also clean a bit some metas since I was testing anyway.
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* SEG - found in Eragon */
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VGMSTREAM * init_vgmstream_seg(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[PATH_LIMIT];
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off_t start_offset;
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int loop_flag;
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int channel_count;
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coding_t coding;
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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("seg",filename_extension(filename))) goto fail;
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/* check header */
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if (read_32bitBE(0x00,streamFile) != 0x73656700) /* "seg\0" */
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goto fail;
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if (read_32bitBE(0x04,streamFile) == 0x70733200) /* "ps2\0" */
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{
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coding = coding_PSX;
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}
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else if (read_32bitBE(0x04,streamFile) == 0x78627800) /* "xbx\0" */
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{
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coding = coding_XBOX_IMA;
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}
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else goto fail;
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loop_flag = 0;
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channel_count = read_32bitLE(0x24,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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start_offset = 0x4000;
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vgmstream->channels = channel_count;
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vgmstream->sample_rate = read_32bitLE(0x18,streamFile);
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vgmstream->coding_type = coding;
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if (loop_flag) {
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vgmstream->loop_start_sample = 0;
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vgmstream->loop_end_sample = read_32bitLE(0x1C,streamFile);
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}
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vgmstream->interleave_block_size = 0;
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if (coding_PSX == coding)
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{
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vgmstream->num_samples = (read_32bitLE(0x0C,streamFile)-start_offset)*28/16/channel_count;
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vgmstream->meta_type = meta_PS2_SEG;
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if (channel_count == 1) {
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vgmstream->layout_type = layout_none;
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} else if (channel_count == 2) {
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = 0x2000;
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}
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}
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else if (coding_XBOX_IMA == coding)
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{
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vgmstream->num_samples = xbox_ima_bytes_to_samples(read_32bitLE(0x0C,streamFile)-start_offset, channel_count);
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vgmstream->meta_type = meta_XBOX_SEG;
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vgmstream->layout_type = layout_none;
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}
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else goto fail;
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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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