#include "meta.h" #include "../util.h" VGMSTREAM * init_vgmstream_nds_strm(STREAMFILE *streamFile) { VGMSTREAM * vgmstream = NULL; char filename[260]; coding_t coding_type; int codec_number; int channel_count; int loop_flag; off_t start_offset; /* check extension, case insensitive */ streamFile->get_name(streamFile,filename,sizeof(filename)); if (strcasecmp("strm",filename_extension(filename))) goto fail; /* check header */ if ((uint32_t)read_32bitBE(0,streamFile)!=0x5354524D || (uint32_t)read_32bitBE(4,streamFile)!=0xFFFE0001) goto fail; /* check for HEAD section */ if ((uint32_t)read_32bitBE(0x10,streamFile)!=0x48454144 || /* "HEAD" */ (uint32_t)read_32bitLE(0x14,streamFile)!=0x50) /* 0x50-sized head is all I've seen */ goto fail; /* check type details */ codec_number = read_8bit(0x18,streamFile); loop_flag = read_8bit(0x19,streamFile); channel_count = read_8bit(0x1a,streamFile); switch (codec_number) { case 0: coding_type = coding_PCM8; break; case 1: coding_type = coding_PCM16LE; break; case 2: coding_type = coding_NDS_IMA; break; default: goto fail; } /* TODO: only mono and stereo supported */ if (channel_count < 1 || channel_count > 2) goto fail; /* build the VGMSTREAM */ vgmstream = allocate_vgmstream(channel_count,loop_flag); if (!vgmstream) goto fail; /* fill in the vital statistics */ vgmstream->num_samples = read_32bitLE(0x24,streamFile); vgmstream->sample_rate = (uint16_t)read_16bitLE(0x1c,streamFile); /* channels and loop flag are set by allocate_vgmstream */ vgmstream->loop_start_sample = read_32bitLE(0x20,streamFile); vgmstream->loop_end_sample = vgmstream->num_samples; vgmstream->coding_type = coding_type; vgmstream->meta_type = meta_STRM; vgmstream->interleave_block_size = read_32bitLE(0x30,streamFile); vgmstream->interleave_smallblock_size = read_32bitLE(0x38,streamFile); if (coding_type==coding_PCM8 || coding_type==coding_PCM16LE) vgmstream->layout_type = layout_none; else vgmstream->layout_type = layout_interleave_shortblock; start_offset = read_32bitLE(0x28,streamFile); /* open the file for reading by each channel */ { int i; for (i=0;ilayout_type==layout_interleave_shortblock) vgmstream->ch[i].streamfile = streamFile->open(streamFile,filename, vgmstream->interleave_block_size); else vgmstream->ch[i].streamfile = streamFile->open(streamFile,filename, 0x1000); if (!vgmstream->ch[i].streamfile) goto fail; vgmstream->ch[i].channel_start_offset= vgmstream->ch[i].offset= start_offset + i*vgmstream->interleave_block_size; } } return vgmstream; /* clean up anything we may have opened */ fail: if (vgmstream) close_vgmstream(vgmstream); return NULL; }