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https://github.com/vgmstream/vgmstream.git
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f6417c5430
There is not no real about having small-ish buffers, simplifies buffer tuning, and avoids having gigantic buffers on bad reads.
120 lines
4.2 KiB
C
120 lines
4.2 KiB
C
#include "meta.h"
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#include "../util.h"
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/* WAV+DCS (DCSW+DCS)
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2008-12-06 - manakoAT : Evil Twin - Cypriens Chronicles...
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2008-12-07 - manakoAT : Added a function to read the Header file and for
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retrieving the channels/frequency, Frequency starts
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always at a "data" chunk - 0x0C bytes, Channels
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always - 0x0E bytes...
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2010-01-13 - manakoAT : Changed the 'Helper' extension from .wav to .dcws, to prevent conflicts */
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VGMSTREAM * init_vgmstream_dc_dcsw_dcs(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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STREAMFILE * streamFileDCSW = NULL;
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char filename[PATH_LIMIT];
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char filenameDCSW[PATH_LIMIT];
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int i;
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int channel_count;
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int loop_flag;
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int frequency;
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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("dcs",filename_extension(filename))) goto fail;
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/* Getting the Header file name... */
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strcpy(filenameDCSW,filename);
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strcpy(filenameDCSW+strlen(filenameDCSW)-3,"dcsw");
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/* Look if the Header file is present, else cancel vgmstream */
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streamFileDCSW = streamFile->open(streamFile,filenameDCSW,STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!streamFileDCSW) goto fail;
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/* check header */
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if (read_32bitBE(0x00,streamFileDCSW) != 0x52494646 || /* "RIFF" */
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read_32bitBE(0x08,streamFileDCSW) != 0x57415645 || /* "WAVE" */
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read_32bitBE(0x0C,streamFileDCSW) != 0x34582E76 || /* 0x34582E76 */
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read_32bitBE(0x3C,streamFileDCSW) != 0x406E616D) /* "@nam" */
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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(streamFileDCSW);
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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,streamFileDCSW));
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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-0x0E,streamFileDCSW);
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frequency = read_32bitLE(current_chunk-0x0C,streamFileDCSW);
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}
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loop_flag = 0;
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/* Seems we're dealing with a vaild file+header,
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now we can finally 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->channels = channel_count;
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vgmstream->sample_rate = frequency;
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vgmstream->num_samples=(get_streamfile_size(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 = (get_streamfile_size(streamFile))*2/channel_count;
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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 = 0x4000;
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}
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vgmstream->coding_type = coding_AICA_int;
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vgmstream->meta_type = meta_DC_DCSW_DCS;
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/* open the file for reading by each channel */
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{
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for (i=0;i<channel_count;i++) {
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vgmstream->ch[i].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!vgmstream->ch[i].streamfile) goto fail;
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vgmstream->ch[i].channel_start_offset=
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vgmstream->ch[i].offset=i*vgmstream->interleave_block_size;
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vgmstream->ch[i].adpcm_step_index = 0x7f; /* AICA */
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}
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}
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close_streamfile(streamFileDCSW); streamFileDCSW=NULL;
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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 (streamFileDCSW) close_streamfile(streamFileDCSW);
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if (vgmstream) close_vgmstream(vgmstream);
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return NULL;
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}
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