#include #include #include #include #include #include "platform.h" #include "metadata.h" #include "metadata_common.h" #include "metadata_parsers.h" #include "rbunicode.h" #include "string-extra.h" /* NOTE: This file was modified to work properly with the new nsf codec based on Game_Music_Emu */ struct NESM_HEADER { uint32_t nHeader; uint8_t nHeaderExtra; uint8_t nVersion; uint8_t nTrackCount; uint8_t nInitialTrack; uint16_t nLoadAddress; uint16_t nInitAddress; uint16_t nPlayAddress; uint8_t szGameTitle[32]; uint8_t szArtist[32]; uint8_t szCopyright[32]; uint16_t nSpeedNTSC; uint8_t nBankSwitch[8]; uint16_t nSpeedPAL; uint8_t nNTSC_PAL; uint8_t nExtraChip; uint8_t nExpansion[4]; } __attribute__((packed)); struct NSFE_INFOCHUNK { uint16_t nLoadAddress; uint16_t nInitAddress; uint16_t nPlayAddress; uint8_t nIsPal; uint8_t nExt; uint8_t nTrackCount; uint8_t nStartingTrack; } __attribute__((packed)); #define CHAR4_CONST(a, b, c, d) FOURCC(a, b, c, d) #define CHUNK_INFO 0x0001 #define CHUNK_DATA 0x0002 #define CHUNK_NEND 0x0004 #define CHUNK_plst 0x0008 #define CHUNK_time 0x0010 #define CHUNK_fade 0x0020 #define CHUNK_tlbl 0x0040 #define CHUNK_auth 0x0080 #define CHUNK_BANK 0x0100 static bool parse_nsfe(int fd, struct mp3entry *id3) { unsigned int chunks_found = 0; long track_count = 0; long playlist_count = 0; struct NSFE_INFOCHUNK info; memset(&info, 0, sizeof(struct NSFE_INFOCHUNK)); /* default values */ info.nTrackCount = 1; id3->length = 150 * 1000; /* begin reading chunks */ while (!(chunks_found & CHUNK_NEND)) { uint32_t chunk_size, chunk_type; if (read_uint32le(fd, &chunk_size) != (int)sizeof(uint32_t)) return false; if (read_uint32be(fd, &chunk_type) != (int)sizeof(uint32_t)) return false; switch (chunk_type) { /* first three types are mandatory (but don't worry about NEND anyway) */ case CHAR4_CONST('I', 'N', 'F', 'O'): { if (chunks_found & CHUNK_INFO) return false; /* only one info chunk permitted */ chunks_found |= CHUNK_INFO; /* minimum size */ if (chunk_size < 8) return false; ssize_t size = MIN(sizeof(struct NSFE_INFOCHUNK), chunk_size); if (read(fd, &info, size) != size) return false; if (size >= 9) track_count = info.nTrackCount; chunk_size -= size; break; } case CHAR4_CONST('D', 'A', 'T', 'A'): { if (!(chunks_found & CHUNK_INFO)) return false; if (chunks_found & CHUNK_DATA) return false; /* only one may exist */ if (chunk_size < 1) return false; chunks_found |= CHUNK_DATA; break; } case CHAR4_CONST('N', 'E', 'N', 'D'): { /* just end parsing regardless of whether or not this really is the last chunk/data (but it _should_ be) */ chunks_found |= CHUNK_NEND; continue; } /* remaining types are optional */ case CHAR4_CONST('a', 'u', 't', 'h'): { if (chunks_found & CHUNK_auth) return false; /* only one may exist */ chunks_found |= CHUNK_auth; /* szGameTitle, szArtist, szCopyright */ char ** const ar[] = { &id3->title, &id3->artist, &id3->album }; char *p = id3->id3v2buf; long buf_rem = sizeof (id3->id3v2buf); unsigned int i; for (i = 0; i < ARRAYLEN(ar) && chunk_size && buf_rem; i++) { long len = read_string(fd, p, buf_rem, '\0', chunk_size); if (len < 0) return false; *ar[i] = p; p += len; buf_rem -= len; if (chunk_size >= (uint32_t)len) chunk_size -= len; else chunk_size = 0; } break; } case CHAR4_CONST('p', 'l', 's', 't'): { if (chunks_found & CHUNK_plst) return false; /* only one may exist */ chunks_found |= CHUNK_plst; /* each byte is the index of one track */ playlist_count = chunk_size; break; } case CHAR4_CONST('t', 'i', 'm', 'e'): case CHAR4_CONST('f', 'a', 'd', 'e'): case CHAR4_CONST('t', 'l', 'b', 'l'): /* we unfortunately can't use these anyway */ { /* don't care how many of these there are even though there should be only one */ if (!(chunks_found & CHUNK_INFO)) return false; case CHAR4_CONST('B', 'A', 'N', 'K'): break; } default: /* unknown chunk */ { /* check the first byte */ chunk_type = (uint8_t)chunk_type; /* chunk is vital... don't continue */ if(chunk_type >= 'A' && chunk_type <= 'Z') return false; /* otherwise, just skip it */ break; } } /* end switch */ lseek(fd, chunk_size, SEEK_CUR); } /* end while */ if (track_count | playlist_count) id3->length = MAX(track_count, playlist_count)*1000; /* Single subtrack files will be treated differently by gme's nsf codec */ if (id3->length <= 1000) id3->length = 150 * 1000; /* * if we exited the while loop without a 'return', we must have hit an NEND * chunk if this is the case, the file was layed out as it was expected. * now.. make sure we found both an info chunk, AND a data chunk... since * these are minimum requirements for a valid NSFE file */ return (chunks_found & (CHUNK_INFO | CHUNK_DATA)) == (CHUNK_INFO | CHUNK_DATA); } static bool parse_nesm(int fd, struct mp3entry *id3) { struct NESM_HEADER hdr; char *p = id3->id3v2buf; lseek(fd, 0, SEEK_SET); if (read(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) return false; /* Length */ id3->length = (hdr.nTrackCount > 1 ? hdr.nTrackCount : 150) * 1000; /* Title */ id3->title = p; p += strlcpy(p, hdr.szGameTitle, 32) + 1; /* Artist */ id3->artist = p; p += strlcpy(p, hdr.szArtist, 32) + 1; /* Copyright (per codec) */ id3->album = p; strlcpy(p, hdr.szCopyright, 32); return true; } bool get_nsf_metadata(int fd, struct mp3entry* id3) { uint32_t nsf_type; if (lseek(fd, 0, SEEK_SET) < 0 || read_uint32be(fd, &nsf_type) != (int)sizeof(nsf_type)) return false; id3->vbr = false; id3->filesize = filesize(fd); /* we only render 16 bits, 44.1KHz, Mono */ id3->bitrate = 706; id3->frequency = 44100; if (nsf_type == CHAR4_CONST('N', 'S', 'F', 'E')) return parse_nsfe(fd, id3); else if (nsf_type == CHAR4_CONST('N', 'E', 'S', 'M')) return parse_nesm(fd, id3); /* not a valid format*/ return false; }