126 lines
4.0 KiB
C
126 lines
4.0 KiB
C
#include "meta.h"
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#include "../util.h"
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/* SNG (from Excite Truck [WII]) */
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VGMSTREAM * init_vgmstream_wii_sng(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 i;
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int loop_flag;
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int channel_count;
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int coef1;
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int coef2;
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int first_block_len;
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int second_channel_start;
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int dataBuffer = 0;
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int Founddata = 0;
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size_t file_size;
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off_t current_chunk;
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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("sng",filename_extension(filename))) goto fail;
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/* check header */
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if (read_32bitBE(0x00,streamFile) != 0x30545352) /* "0STR" */
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goto fail;
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if (read_32bitBE(0x04,streamFile) != 0x34000000) /* 0x34000000 */
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goto fail;
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if (read_32bitBE(0x08,streamFile) != 0x08000000) /* 0x08000000" */
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goto fail;
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if (read_32bitBE(0x0C,streamFile) != 0x01000000) /* 0x01000000 */
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goto fail;
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if (read_32bitLE(0x10,streamFile) != (get_streamfile_size(streamFile)))
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goto fail;
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loop_flag = (read_32bitLE(0x130,streamFile) !=0); /* not sure */
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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 = 0x180;
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vgmstream->channels = channel_count;
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vgmstream->sample_rate = read_32bitLE(0x110,streamFile);
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vgmstream->coding_type = coding_NGC_DSP;
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vgmstream->num_samples = read_32bitLE(0x100,streamFile)/16*14*2;
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if (loop_flag) {
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vgmstream->loop_start_sample = read_32bitBE(0x130,streamFile)/16*14;
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vgmstream->loop_end_sample = read_32bitBE(0x134,streamFile)/16*14;
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}
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vgmstream->layout_type = layout_none;
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vgmstream->meta_type = meta_WII_SNG;
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/* scan file until we find a "data" string */
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first_block_len = read_32bitLE(0x100,streamFile);
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file_size = get_streamfile_size(streamFile);
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{
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current_chunk = first_block_len;
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/* Start at 0 and loop until we reached the
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file size, or until we found a "data string */
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while (!Founddata && current_chunk < file_size) {
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dataBuffer = (read_32bitLE(current_chunk,streamFile));
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if (dataBuffer == first_block_len) { /* The value from the first block length */
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/* if "data" string found, retrieve the needed infos */
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Founddata = 1;
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second_channel_start = current_chunk+0x80;
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/* We will cancel the search here if we have a match */
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break;
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}
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/* else we will increase the search offset by 1 */
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current_chunk = current_chunk + 1;
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}
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}
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coef1 = 0x13C;
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if (Founddata == 0) {
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goto fail;
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} else if (Founddata == 1) {
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coef2 = current_chunk+0x3C;
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}
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for (i=0;i<16;i++)
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vgmstream->ch[0].adpcm_coef[i] = read_16bitBE(coef1+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(coef2+i*2,streamFile);
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}
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/* open the file for reading */
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{
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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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/* The first channel */
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vgmstream->ch[0].channel_start_offset=
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vgmstream->ch[0].offset=start_offset;
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/* The second channel */
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if (channel_count == 2) {
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vgmstream->ch[1].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!vgmstream->ch[1].streamfile) goto fail;
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vgmstream->ch[i].channel_start_offset=
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vgmstream->ch[1].offset=second_channel_start;
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}
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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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