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https://github.com/vgmstream/vgmstream.git
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111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
#include "meta.h"
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#include "../util.h"
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/* DMSG
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found in: Nightcaster II - Equinox
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2010-01-05 (manakoAT): Seems it's a corrupted "SGT" file, but I'm not sure...
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*/
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VGMSTREAM * init_vgmstream_dmsg(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 frequency;
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int channel_count;
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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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off_t start_offset;
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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("dmsg",filename_extension(filename))) goto fail;
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/* check header */
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if (read_32bitBE(0x00,streamFile) != 0x52494646) /* "RIFF" */
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goto fail;
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if (read_32bitBE(0x08,streamFile) != 0x444D5347) /* "DMSG" */
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goto fail;
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if (read_32bitBE(0x0C,streamFile) != 0x73656768) /* "segh" */
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goto fail;
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if (read_32bitBE(0x10,streamFile) != 0x38000000) /* "0x38" */
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goto fail;
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/* scan file until we find a "data" string */
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file_size = get_streamfile_size(streamFile);
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{
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current_chunk = 0;
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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_32bitBE(current_chunk,streamFile));
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if (dataBuffer == 0x64617461) { /* "data" */
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/* if "data" string found, retrieve the needed infos */
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Founddata = 1;
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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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if (Founddata == 0) {
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goto fail;
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} else if (Founddata == 1) {
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channel_count = (uint16_t)read_16bitLE(current_chunk-0x10,streamFile);
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frequency = read_32bitLE(current_chunk-0xE,streamFile);
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}
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loop_flag = 1;
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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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if (Founddata == 0) {
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goto fail;
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} else if (Founddata == 1) {
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start_offset = current_chunk+0x8;
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vgmstream->channels = channel_count;
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vgmstream->sample_rate = frequency;
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vgmstream->coding_type = coding_PCM16LE;
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vgmstream->num_samples = (read_32bitLE(current_chunk+0x4,streamFile)/2/channel_count);
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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(current_chunk+0x4,streamFile)/2/channel_count);
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}
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}
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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 > 1) {
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = 0x2;
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}
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vgmstream->meta_type = meta_DMSG;
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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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