2008-02-04 16:20:20 +01:00
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#include "brstm.h"
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#include "../util.h"
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VGMSTREAM * init_vgmstream_brstm(const char * const filename) {
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VGMSTREAM * vgmstream = NULL;
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STREAMFILE * infile = NULL;
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coding_t coding_type;
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off_t head_offset;
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size_t head_length;
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int codec_number;
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int channel_count;
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int loop_flag;
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off_t start_offset;
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/* check extension, case insensitive */
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if (strcasecmp("brstm",filename_extension(filename))) goto fail;
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/* try to open the file for header reading */
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infile = open_streamfile(filename);
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if (!infile) goto fail;
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/* check header */
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2008-02-05 08:38:00 +01:00
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if ((uint32_t)read_32bitBE(0,infile)!=0x5253544D || /* "RSTM" */
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2008-02-04 16:20:20 +01:00
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(uint32_t)read_32bitBE(4,infile)!=0xFEFF0100)
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goto fail;
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/* get head offset, check */
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head_offset = read_32bitBE(0x10,infile);
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2008-02-05 08:38:00 +01:00
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if ((uint32_t)read_32bitBE(head_offset,infile)!=0x48454144) /* "HEAD" */
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2008-02-04 16:20:20 +01:00
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goto fail;
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head_length = read_32bitBE(0x14,infile);
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/* check type details */
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codec_number = read_8bit(head_offset+0x20,infile);
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loop_flag = read_8bit(head_offset+0x21,infile);
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channel_count = read_8bit(head_offset+0x22,infile);
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switch (codec_number) {
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case 0:
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coding_type = coding_PCM8;
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break;
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case 1:
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coding_type = coding_PCM16BE;
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break;
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case 2:
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coding_type = coding_NGC_DSP;
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break;
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default:
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goto fail;
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}
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/* TODO: only mono and stereo supported */
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if (channel_count < 1 || channel_count > 2) goto fail;
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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 = read_32bitBE(head_offset+0x2c,infile);
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2008-03-11 06:17:57 +01:00
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vgmstream->sample_rate = (uint16_t)read_16bitBE(head_offset+0x24,infile);
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2008-02-04 16:20:20 +01:00
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/* channels and loop flag are set by allocate_vgmstream */
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vgmstream->loop_start_sample = read_32bitBE(head_offset+0x28,infile);
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vgmstream->loop_end_sample = vgmstream->num_samples;
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vgmstream->coding_type = coding_type;
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2008-02-05 01:03:39 +01:00
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if (channel_count==1)
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vgmstream->layout_type = layout_none;
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else
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vgmstream->layout_type = layout_interleave_shortblock;
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2008-02-04 16:20:20 +01:00
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vgmstream->meta_type = meta_RSTM;
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vgmstream->interleave_block_size = read_32bitBE(head_offset+0x38,infile);
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vgmstream->interleave_smallblock_size = read_32bitBE(head_offset+0x48,infile);
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2008-02-05 08:38:00 +01:00
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if (vgmstream->coding_type == coding_NGC_DSP) {
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off_t coef_offset;
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off_t coef_offset1;
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off_t coef_offset2;
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2008-02-04 16:20:20 +01:00
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int i;
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2008-02-05 08:38:00 +01:00
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coef_offset1=read_32bitBE(head_offset+0x1c,infile);
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coef_offset2=read_32bitBE(head_offset+0x10+coef_offset1,infile);
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coef_offset=coef_offset2+0x10;
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2008-02-04 16:20:20 +01:00
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for (i=0;i<16;i++) {
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vgmstream->ch[0].adpcm_coef[i]=read_16bitBE(head_offset+coef_offset+i*2,infile);
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}
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if (vgmstream->channels==2) {
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for (i=0;i<16;i++) {
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vgmstream->ch[1].adpcm_coef[i]=read_16bitBE(head_offset+coef_offset+0x38+i*2,infile);
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}
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}
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}
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start_offset = read_32bitBE(head_offset+0x30,infile);
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close_streamfile(infile); infile=NULL;
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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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2008-02-05 08:38:00 +01:00
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if (vgmstream->layout_type==layout_interleave_shortblock)
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vgmstream->ch[i].streamfile = open_streamfile_buffer(filename,
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vgmstream->interleave_block_size);
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else
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vgmstream->ch[i].streamfile = open_streamfile_buffer(filename,
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2008-02-04 16:20:20 +01:00
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0x1000);
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2008-02-05 08:38:00 +01:00
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2008-02-04 16:20:20 +01:00
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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=
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start_offset + 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 (infile) close_streamfile(infile);
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if (vgmstream) close_vgmstream(vgmstream);
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return NULL;
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}
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