mirror of
https://github.com/vgmstream/vgmstream.git
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85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
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#include "meta.h"
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#include "../util.h"
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/* NWA - Visual Arts streams
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*
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* This can apparently get a lot more complicated, I'm only handling the
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* raw PCM case at the moment (until I see something else).
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*
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* Kazunori "jagarl" Ueno's nwatowav was helpful, and will probably be used
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* to write coding support if it comes to that.
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*/
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VGMSTREAM * init_vgmstream_nwa(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[260];
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int i;
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int channel_count;
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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("nwa",filename_extension(filename))) goto fail;
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/* check that we're using raw pcm */
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if (
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read_32bitLE(0x08,streamFile)!=-1 || /* compression level */
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read_32bitLE(0x10,streamFile)!=0 || /* block count */
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read_32bitLE(0x18,streamFile)!=0 || /* compressed data size */
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read_32bitLE(0x20,streamFile)!=0 || /* block size */
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read_32bitLE(0x24,streamFile)!=0 /* restsize */
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) goto fail;
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channel_count = read_16bitLE(0x00,streamFile);
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channel_count,0);
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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 = read_32bitLE(0x04,streamFile);
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switch (read_16bitLE(0x02,streamFile)) {
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case 16:
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vgmstream->coding_type = coding_PCM16LE;
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vgmstream->interleave_block_size = 2;
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break;
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case 8:
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vgmstream->coding_type = coding_PCM8;
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vgmstream->interleave_block_size = 1;
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break;
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default:
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goto fail;
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}
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vgmstream->num_samples = read_32bitLE(0x1c,streamFile)/channel_count;
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if (channel_count > 1) {
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vgmstream->layout_type = layout_interleave;
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} else {
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vgmstream->layout_type = layout_none;
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}
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vgmstream->meta_type = meta_NWA;
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/* open the file for reading by each channel */
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{
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STREAMFILE *chstreamfile;
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/* have both channels use the same buffer, as interleave is so small */
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chstreamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!chstreamfile) goto fail;
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for (i=0;i<2;i++) {
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vgmstream->ch[i].streamfile = chstreamfile;
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vgmstream->ch[i].channel_start_offset=
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vgmstream->ch[i].offset=0x2c+(off_t)(i*vgmstream->interleave_block_size);
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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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