mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-14 23:52:53 +01:00
127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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#include "../layout/layout.h"
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#include "../util.h"
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VGMSTREAM * init_vgmstream_halpst(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[PATH_LIMIT];
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int channel_count;
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int loop_flag = 0;
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int32_t samples_l,samples_r;
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int32_t start_sample = 0;
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size_t max_block;
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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("hps",filename_extension(filename))) goto fail;
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/* check header */
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if ((uint32_t)read_32bitBE(0,streamFile)!=0x2048414C || /* " HAL" */
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read_32bitBE(4,streamFile)!=0x50535400) /* "PST\0" */
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goto fail;
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/* details */
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channel_count = read_32bitBE(0xc,streamFile);
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max_block = read_32bitBE(0x10,streamFile)/channel_count;
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if (channel_count != 1 && channel_count != 2) goto fail;
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/* yay for redundancy, gives us something to test */
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samples_l = dsp_nibbles_to_samples(read_32bitBE(0x18,streamFile))+1;
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if (channel_count == 2) {
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samples_r = dsp_nibbles_to_samples(read_32bitBE(0x50,streamFile))+1;
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if (samples_l != samples_r) goto fail;
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}
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/*
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* looping info is implicit in the "next block" field of the final
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* block, so we have to find that
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*/
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{
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off_t offset = 0x80, last_offset = 0;
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off_t loop_offset;
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/* determine if there is a loop */
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while (offset > last_offset) {
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last_offset = offset;
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offset = read_32bitBE(offset+8,streamFile);
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}
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if (offset < 0) loop_flag = 0;
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else {
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/* one more pass to determine start sample */
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int32_t start_nibble = 0;
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loop_flag = 1;
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loop_offset = offset;
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offset = 0x80;
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while (offset != loop_offset) {
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start_nibble += read_32bitBE(offset,streamFile);
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offset = read_32bitBE(offset+8,streamFile);
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}
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start_sample = dsp_nibbles_to_samples(start_nibble);
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}
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}
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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 = samples_l;
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vgmstream->sample_rate = read_32bitBE(8,streamFile);
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/* channels and loop flag are set by allocate_vgmstream */
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if (loop_flag) {
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vgmstream->loop_start_sample = start_sample;
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vgmstream->loop_end_sample = vgmstream->num_samples;
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}
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vgmstream->coding_type = coding_NGC_DSP;
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vgmstream->layout_type = layout_halpst_blocked;
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vgmstream->meta_type = meta_HALPST;
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/* load decode coefs */
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{
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int i;
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for (i=0;i<16;i++)
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vgmstream->ch[0].adpcm_coef[i] = read_16bitBE(0x20+i*2,streamFile);
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if (channel_count == 2)
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for (i=0;i<16;i++)
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vgmstream->ch[1].adpcm_coef[i] = read_16bitBE(0x58+i*2,streamFile);
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}
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/* open the file for reading by each channel */
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{
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int i;
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for (i=0;i<channel_count;i++) {
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vgmstream->ch[i].streamfile = streamFile->open(streamFile,filename,
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(i==0?
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max_block+0x20: /* first buffer a bit bigger to
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read block header without
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inefficiency */
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max_block
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)
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);
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if (!vgmstream->ch[i].streamfile) goto fail;
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}
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}
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/* start me up */
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halpst_block_update(0x80,vgmstream);
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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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