/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2005 Dave Chapman * * All files in this archive are subject to the GNU General Public License. * See the file COPYING in the source tree root for full license agreement. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include #include #include #include #include "metadata.h" #include "mp3_playback.h" #include "logf.h" #include "atoi.h" #include "replaygain.h" #include "debug.h" /* Simple file type probing by looking filename extension. */ int probe_file_format(const char *filename) { char *suffix; suffix = strrchr(filename, '.'); if (suffix == NULL) return AFMT_UNKNOWN; suffix += 1; if (!strcasecmp("mp1", suffix)) return AFMT_MPA_L1; else if (!strcasecmp("mp2", suffix)) return AFMT_MPA_L2; else if (!strcasecmp("mpa", suffix)) return AFMT_MPA_L2; else if (!strcasecmp("mp3", suffix)) return AFMT_MPA_L3; else if (!strcasecmp("ogg", suffix)) return AFMT_OGG_VORBIS; else if (!strcasecmp("wav", suffix)) return AFMT_PCM_WAV; else if (!strcasecmp("flac", suffix)) return AFMT_FLAC; else if (!strcasecmp("mpc", suffix)) return AFMT_MPC; else if (!strcasecmp("aac", suffix)) return AFMT_AAC; else if (!strcasecmp("ape", suffix)) return AFMT_APE; else if (!strcasecmp("wma", suffix)) return AFMT_WMA; else if ((!strcasecmp("a52", suffix)) || (!strcasecmp("ac3", suffix))) return AFMT_A52; else if (!strcasecmp("rm", suffix)) return AFMT_REAL; else if (!strcasecmp("wv", suffix)) return AFMT_WAVPACK; return AFMT_UNKNOWN; } unsigned short a52_bitrates[]={32,40,48,56,64,80,96, 112,128,160,192,224,256,320, 384,448,512,576,640}; /* Only store frame sizes for 44.1KHz - others are simply multiples of the bitrate */ unsigned short a52_441framesizes[]= {69*2,70*2,87*2,88*2,104*2,105*2,121*2,122*2, 139*2,140*2,174*2,175*2,208*2,209*2,243*2,244*2, 278*2,279*2,348*2,349*2,417*2,418*2,487*2,488*2, 557*2,558*2,696*2,697*2,835*2,836*2,975*2,976*2, 1114*2,1115*2,1253*2,1254*2,1393*2,1394*2}; const long wavpack_sample_rates [] = { 6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000, 64000, 88200, 96000, 192000 }; /* Get metadata for track - return false if parsing showed problems with the file that would prevent playback. */ static bool get_apetag_info (struct mp3entry *entry, int fd); static bool get_vorbis_comments (struct mp3entry *entry, size_t bytes_remaining, int fd); static void little_endian_to_native (void *data, char *format); bool get_metadata(struct track_info* track, int fd, const char* trackname, bool v1first) { unsigned long totalsamples,bytespersample,channels,bitspersample,numbytes; unsigned long serialno=0, last_serialno=0; int bytesperframe; unsigned char* buf; int i,j,eof; int rc; int segments; /* for Vorbis*/ size_t bytes_remaining = 0; /* for Vorbis */ /* Load codec specific track tag information. */ switch (track->id3.codectype) { case AFMT_MPA_L1: case AFMT_MPA_L2: case AFMT_MPA_L3: /* Should check the return value. */ mp3info(&track->id3, trackname, v1first); lseek(fd, 0, SEEK_SET); /* logf("T:%s", track->id3.title); logf("L:%d", track->id3.length); logf("O:%d", track->id3.first_frame_offset); logf("F:%d", track->id3.frequency); */ track->taginfo_ready = true; break ; case AFMT_PCM_WAV: /* Use the trackname part of the id3 structure as a temporary buffer */ buf=track->id3.path; lseek(fd, 0, SEEK_SET); rc = read(fd, buf, 44); if (rc < 44) { return false; } if ((memcmp(buf,"RIFF",4)!=0) || (memcmp(&buf[8],"WAVEfmt",7)!=0)) { logf("%s is not a WAV file\n",trackname); return(false); } /* FIX: Correctly parse WAV header - we assume canonical 44-byte header */ bitspersample=buf[34]; channels=buf[22]; if ((bitspersample!=16) || (channels != 2)) { logf("Unsupported WAV file - %d bitspersample, %d channels\n", bitspersample,channels); return(false); } bytespersample=((bitspersample/8)*channels); numbytes=(buf[40]|(buf[41]<<8)|(buf[42]<<16)|(buf[43]<<24)); totalsamples=numbytes/bytespersample; track->id3.vbr=false; /* All WAV files are CBR */ track->id3.filesize=filesize(fd); track->id3.frequency=buf[24]|(buf[25]<<8)|(buf[26]<<16)|(buf[27]<<24); /* Calculate track length (in ms) and estimate the bitrate (in kbit/s) */ track->id3.length=(totalsamples/track->id3.frequency)*1000; track->id3.bitrate=(track->id3.frequency*bytespersample)/(1000/8); lseek(fd, 0, SEEK_SET); strncpy(track->id3.path,trackname,sizeof(track->id3.path)); track->taginfo_ready = true; break; case AFMT_FLAC: /* A simple parser to read vital metadata from a FLAC file - length, frequency, bitrate etc. */ /* This code should either be moved to a seperate file, or discarded in favour of the libFLAC code */ /* The FLAC stream specification can be found at http://flac.sourceforge.net/format.html#stream */ /* Use the trackname part of the id3 structure as a temporary buffer */ buf=track->id3.path; lseek(fd, 0, SEEK_SET); rc = read(fd, buf, 4); if (rc < 4) { return false; } if (memcmp(buf,"fLaC",4)!=0) { logf("%s is not a FLAC file\n",trackname); return(false); } while (1) { rc = read(fd, buf, 4); i = (buf[1]<<16)|(buf[2]<<8)|buf[3]; /* The length of the block */ if ((buf[0]&0x7f)==0) { /* 0 is the STREAMINFO block */ rc = read(fd, buf, i); /* FIXME: Don't trust the value of i */ if (rc < 0) { return false; } track->id3.vbr=true; /* All FLAC files are VBR */ track->id3.filesize=filesize(fd); track->id3.frequency=(buf[10]<<12)|(buf[11]<<4)|((buf[12]&0xf0)>>4); /* NOT NEEDED: bitspersample=(((buf[12]&0x01)<<4)|((buf[13]&0xf0)>>4))+1; */ /* totalsamples is a 36-bit field, but we assume <= 32 bits are used */ totalsamples=(buf[14]<<24)|(buf[15]<<16)|(buf[16]<<8)|buf[17]; /* Calculate track length (in ms) and estimate the bitrate (in kbit/s) */ track->id3.length=(totalsamples/track->id3.frequency)*1000; track->id3.bitrate=(filesize(fd)*8)/track->id3.length; } else if ((buf[0]&0x7f)==4) { /* 4 is the VORBIS_COMMENT block */ /* The next i bytes of the file contain the VORBIS COMMENTS - just skip them for now. */ //lseek(fd, i, SEEK_CUR); if (!get_vorbis_comments(&(track->id3), i, fd)) { return false; } } else { if (buf[0]&0x80) { /* If we have reached the last metadata block, abort. */ break; } else { lseek(fd, i, SEEK_CUR); /* Skip to next metadata block */ } } } lseek(fd, 0, SEEK_SET); strncpy(track->id3.path,trackname,sizeof(track->id3.path)); track->taginfo_ready = true; break; case AFMT_OGG_VORBIS: /* A simple parser to read vital metadata from an Ogg Vorbis file */ /* An Ogg File is split into pages, each starting with the string "OggS". Each page has a timestamp (in PCM samples) referred to as the "granule position". An Ogg Vorbis has the following structure: 1) Identification header (containing samplerate, numchannels, etc) 2) Comment header - containing the Vorbis Comments 3) Setup header - containing codec setup information 4) Many audio packets... */ /* Use the trackname part of the id3 structure as a temporary buffer */ buf=track->id3.path; lseek(fd, 0, SEEK_SET); rc = read(fd, buf, 58); if (rc < 4) { return false; } if ((memcmp(buf,"OggS",4)!=0) || (memcmp(&buf[29],"vorbis",6)!=0)) { logf("%s is not an Ogg Vorbis file\n",trackname); return(false); } /* We need to ensure the serial number from this page is the * same as the one from the last page (since we only support * a single bitstream). */ serialno = buf[14]|(buf[15]<<8)|(buf[16]<<16)|(buf[17]<<24); /* Ogg stores integers in little-endian format. */ track->id3.filesize=filesize(fd); track->id3.frequency=buf[40]|(buf[41]<<8)|(buf[42]<<16)|(buf[43]<<24); channels=buf[39]; /* Comments are in second Ogg page */ if ( lseek(fd, 58, SEEK_SET) < 0 ) { return false; } /* Minimum header length for Ogg pages is 27 */ if (read(fd, buf, 27) < 27) { return false; } if (memcmp(buf,"OggS",4)!=0) { logf("1: Not an Ogg Vorbis file"); return(false); } segments=buf[26]; /* read in segment table */ if (read(fd, buf, segments) < segments) { return false; } /* The second packet in a vorbis stream is the comment packet. It *may* * extend beyond the second page, but usually does not. Here we find the * length of the comment packet (or the rest of the page if the comment * packet extends to the third page). */ for (i = 0; i < segments; i++) { bytes_remaining += buf[i]; /* The last segment of a packet is always < 255 bytes */ if (buf[i] < 255) { break; } } /* Now read in packet header (type and id string) */ if(read(fd, buf, 7) < 7) { return false; } /* The first byte of a packet is the packet type; comment packets are * type 3. */ if ((buf[0] != 3) || (memcmp(buf + 1,"vorbis",6)!=0)) { logf("Not a vorbis comment packet"); return false; } bytes_remaining -= 7; if ( !get_vorbis_comments(&(track->id3), bytes_remaining, fd) ) { logf("get_vorbis_comments failed"); return(false); } /* We now need to search for the last page in the file - identified by by ('O','g','g','S',0) and retrieve totalsamples */ lseek(fd, -64*1024, SEEK_END); /* A page is always < 64 kB */ eof=0; j=0; /* The number of bytes currently in buffer */ i=0; totalsamples=0; while (!eof) { rc = read(fd, &buf[j], MAX_PATH-j); if (rc <= 0) { eof=1; } else { j+=rc; } /* Inefficient (but simple) search */ i=0; while (i < (j-5)) { if (memcmp(&buf[i],"OggS",5)==0) { if (i < (j-17)) { /* Note that this only reads the low 32 bits of a 64 bit value */ totalsamples=(buf[i+6])|(buf[i+7]<<8)|(buf[i+8]<<16)|(buf[i+9]<<24); last_serialno=(buf[i+14])|(buf[i+15]<<8)|(buf[i+16]<<16)|(buf[i+17]<<24); j=0; /* We can discard the rest of the buffer */ } else { break; } } else { i++; } } if (i < (j-5)) { /* Move OggS to start of buffer */ while(i>0) buf[i--]=buf[j--]; } else { j=0; } } /* This file has mutiple vorbis bitstreams (or is corrupt) */ /* FIXME we should display an error here */ if (serialno != last_serialno) { track->taginfo_ready=false; logf("serialno mismatch"); logf("%ld", serialno); logf("%ld", last_serialno); return false; } track->id3.samples=totalsamples; track->id3.length=(totalsamples/track->id3.frequency)*1000; /* The following calculation should use datasize, not filesize (i.e. exclude comments etc) */ track->id3.bitrate=(filesize(fd)*8)/track->id3.length; track->id3.vbr=true; lseek(fd, 0, SEEK_SET); strncpy(track->id3.path,trackname,sizeof(track->id3.path)); track->taginfo_ready = true; break; case AFMT_WAVPACK: /* A simple parser to read basic information from a WavPack file. * This will fail on WavPack files that don't have the WavPack header * as the first thing (i.e. self-extracting WavPack files) or WavPack * files that have so much extra RIFF data stored in the first block * that they don't have samples (very rare, I would think). */ /* Use the trackname part of the id3 structure as a temporary buffer */ buf=track->id3.path; lseek(fd, 0, SEEK_SET); rc = read(fd, buf, 32); if (rc < 32) { return false; } if (memcmp (buf, "wvpk", 4) != 0 || buf [9] != 4 || buf [8] < 2) { logf ("%s is not a WavPack file\n", trackname); return (false); } track->id3.vbr = true; /* All WavPack files are VBR */ track->id3.filesize = filesize (fd); if ((buf [20] | buf [21] | buf [22] | buf [23]) && (buf [12] & buf [13] & buf [14] & buf [15]) != 0xff) { int srindx = ((buf [26] >> 7) & 1) + ((buf [27] << 1) & 14); if (srindx == 15) track->id3.frequency = 44100; else track->id3.frequency = wavpack_sample_rates [srindx]; totalsamples = (buf[15] << 24) | (buf[14] << 16) | (buf[13] << 8) | buf[12]; track->id3.length = totalsamples / (track->id3.frequency / 100) * 10; track->id3.bitrate = filesize (fd) / (track->id3.length / 8); } get_apetag_info (&track->id3, fd); /* use any apetag info we find */ lseek (fd, 0, SEEK_SET); strncpy (track->id3.path, trackname, sizeof (track->id3.path)); track->taginfo_ready = true; break; case AFMT_A52: /* Use the trackname part of the id3 structure as a temporary buffer */ buf=track->id3.path; lseek(fd, 0, SEEK_SET); /* We just need the first 5 bytes */ rc = read(fd, buf, 5); if (rc < 5) { return false; } if ((buf[0]!=0x0b) || (buf[1]!=0x77)) { logf("%s is not an A52/AC3 file\n",trackname); return false; } i = buf[4]&0x3e; if (i > 36) { logf("A52: Invalid frmsizecod: %d\n",i); return false; } track->id3.bitrate=a52_bitrates[i>>1]; track->id3.vbr=false; track->id3.filesize = filesize (fd); switch (buf[4]&0xc0) { case 0x00: track->id3.frequency=48000; bytesperframe=track->id3.bitrate*2*2; break; case 0x40: track->id3.frequency=44100; bytesperframe=a52_441framesizes[i]; break; case 0x80: track->id3.frequency=32000; bytesperframe=track->id3.bitrate*3*2; break; default: logf("A52: Invalid samplerate code: 0x%02x\n",buf[4]&0xc0); return false; break; } /* One A52 frame contains 6 blocks, each containing 256 samples */ totalsamples=(track->filesize/bytesperframe)*6*256; track->id3.length=(totalsamples/track->id3.frequency)*1000; lseek(fd, 0, SEEK_SET); strncpy(track->id3.path,trackname,sizeof(track->id3.path)); track->taginfo_ready = true; break; /* If we don't know how to read the metadata, just store the filename */ default: strncpy(track->id3.path,trackname,sizeof(track->id3.path)); track->taginfo_ready = true; break; } return true; } /************************* APE TAG HANDLING CODE ****************************/ /* * This is a first pass at APEv2 tag handling. I'm not sure if this should * reside here, but I wanted to modify as little as possible since I don't * have a feel for the complete system. It may be that APEv2 tags should be * added to the ID3 handling code in the firmware directory. APEv2 tags are * used in WavPack files and Musepack files by default, however they are * also used in MP3 files sometimes (by Foobar2000). Also, WavPack files can * also use ID3v1 tags (but not ID3v2), so it seems like some universal tag * handler might be a reasonable approach. * * This code does not currently handle APEv1 tags, but I believe that this * is not a problem because they were only used in Monkey's Audio files which * will probably never be playable in RockBox (and certainly not by this CPU). */ #define APETAG_HEADER_FORMAT "8LLLL" #define APETAG_HEADER_LENGTH 32 #define APETAG_DATA_LIMIT 4096 struct apetag_header { char id [8]; long version, length, item_count, flags; char res [8]; }; static struct apetag { struct apetag_header header; char data [APETAG_DATA_LIMIT]; } temp_apetag; static int get_apetag_item (struct apetag *tag, const char *item, char *value, int size); static int load_apetag (int fd, struct apetag *tag); static void UTF8ToAnsi (unsigned char *pUTF8); /* * This function searches the specified file for an APEv2 tag and uses any * information found there to populate the appropriate fields in the specified * mp3entry structure. A temporary buffer is used to hold the tag during this * operation. For now, the actual string data that needs to be held during the * life of the track entry is stored in the "id3v2buf" field (which should not * be used for any file that has an APEv2 tag). This limits the total space * for the artist, title, album, composer and genre strings to 300 characters. */ static bool get_apetag_info (struct mp3entry *entry, int fd) { int rem_space = sizeof (entry->id3v2buf), str_space; char *temp_buffer = entry->id3v2buf; if (rem_space <= 1 || !load_apetag (fd, &temp_apetag)) return false; if (get_apetag_item (&temp_apetag, "year", temp_buffer, rem_space)) entry->year = atoi (temp_buffer); if (get_apetag_item (&temp_apetag, "track", temp_buffer, rem_space)) entry->tracknum = atoi (temp_buffer); if (get_apetag_item (&temp_apetag, "replaygain_track_peak", temp_buffer, rem_space)) entry->track_peak = get_replaypeak (temp_buffer); if (get_apetag_item (&temp_apetag, "replaygain_album_peak", temp_buffer, rem_space)) entry->album_peak = get_replaypeak (temp_buffer); if (rem_space > 1 && get_apetag_item (&temp_apetag, "replaygain_track_gain", temp_buffer, rem_space)) { entry->track_gain = get_replaygain (entry->track_gain_string = temp_buffer); str_space = strlen (temp_buffer) + 1; temp_buffer += str_space; rem_space -= str_space; } if (rem_space > 1 && get_apetag_item (&temp_apetag, "replaygain_album_gain", temp_buffer, rem_space)) { entry->album_gain = get_replaygain (entry->album_gain_string = temp_buffer); str_space = strlen (temp_buffer) + 1; temp_buffer += str_space; rem_space -= str_space; } if (rem_space > 1 && get_apetag_item (&temp_apetag, "artist", temp_buffer, rem_space)) { UTF8ToAnsi (entry->artist = temp_buffer); str_space = strlen (temp_buffer) + 1; temp_buffer += str_space; rem_space -= str_space; } if (rem_space > 1 && get_apetag_item (&temp_apetag, "title", temp_buffer, rem_space)) { UTF8ToAnsi (entry->title = temp_buffer); str_space = strlen (temp_buffer) + 1; temp_buffer += str_space; rem_space -= str_space; } if (rem_space > 1 && get_apetag_item (&temp_apetag, "album", temp_buffer, rem_space)) { UTF8ToAnsi (entry->album = temp_buffer); str_space = strlen (temp_buffer) + 1; temp_buffer += str_space; rem_space -= str_space; } if (rem_space > 1 && get_apetag_item (&temp_apetag, "genre", temp_buffer, rem_space)) { UTF8ToAnsi (entry->genre_string = temp_buffer); str_space = strlen (temp_buffer) + 1; temp_buffer += str_space; rem_space -= str_space; } if (rem_space > 1 && get_apetag_item (&temp_apetag, "composer", temp_buffer, rem_space)) UTF8ToAnsi (entry->composer = temp_buffer); return true; } /* * Helper function to convert little-endian structures to easily usable native * format using a format string (this does nothing on a little-endian machine). */ static void little_endian_to_native (void *data, char *format) { unsigned char *cp = (unsigned char *) data; long temp; while (*format) { switch (*format) { case 'L': temp = cp [0] + ((long) cp [1] << 8) + ((long) cp [2] << 16) + ((long) cp [3] << 24); * (long *) cp = temp; cp += 4; break; case 'S': temp = cp [0] + (cp [1] << 8); * (short *) cp = (short) temp; cp += 2; break; default: if (*format >= '0' && *format <= '9') cp += *format - '0'; break; } format++; } } /* * Attempt to obtain the named string-type item from the specified APEv2 tag. * The tag value will be copied to "value" (including an appended terminating * NULL) and the length of the string (including the NULL) will be returned. * If the data will not fit in the specified "size" then it will be truncated * early (but still terminated). If the specified item is not found then 0 is * returned and written to the first character of "value". If "value" is * passed in as NULL, then the specified size is ignored and the actual size * required to store the value is returned. * * Note that this function does not work on binary tag data; only UTF-8 * encoded strings. However, numeric data (like ReplayGain) is usually stored * as strings. * * Also, APEv2 tags may have multiple values for a given item and these will * all be copied to "value" with NULL separators (this is why the total data * size is returned). Of course, it is possible to ignore any additional * values by simply using up to the first NULL. */ static int get_apetag_item (struct apetag *tag, const char *item, char *value, int size) { if (value && size) *value = 0; if (tag->header.id [0] == 'A') { char *p = tag->data; char *q = p + tag->header.length - APETAG_HEADER_LENGTH; int i; for (i = 0; i < tag->header.item_count; ++i) { int vsize, flags, isize; vsize = * (long *) p; p += 4; flags = * (long *) p; p += 4; isize = strlen (p); little_endian_to_native (&vsize, "L"); little_endian_to_native (&flags, "L"); if (p + isize + vsize + 1 > q) break; if (isize && vsize && !stricmp (item, p) && !(flags & 6)) { if (value) { if (vsize + 1 > size) vsize = size - 1; memcpy (value, p + isize + 1, vsize); value [vsize] = 0; } return vsize + 1; } else p += isize + vsize + 1; } } return 0; } /* * Attempt to load an APEv2 tag from the specified file into the specified * structure. If the APEv2 tag will not fit into the predefined data size, * then the tag is not loaded. A return value of TRUE indicates success. */ static int load_apetag (int fd, struct apetag *tag) { if (lseek (fd, -APETAG_HEADER_LENGTH, SEEK_END) == -1 || read (fd, &tag->header, APETAG_HEADER_LENGTH) != APETAG_HEADER_LENGTH || strncmp (tag->header.id, "APETAGEX", 8)) { tag->header.id [0] = 0; return false; } little_endian_to_native (&tag->header, APETAG_HEADER_FORMAT); if (tag->header.version == 2000 && tag->header.item_count && tag->header.length > APETAG_HEADER_LENGTH && tag->header.length < APETAG_DATA_LIMIT) { int data_size = tag->header.length - APETAG_HEADER_LENGTH; if (lseek (fd, -tag->header.length, SEEK_END) == -1 || read (fd, tag->data, data_size) != data_size) { tag->header.id [0] = 0; return false; } else return true; } tag->header.id [0] = 0; return false; } /* * This is a *VERY* boneheaded attempt to convert UTF-8 unicode character * strings to ANSI. It simply maps the 16-bit Unicode characters that are * less than 0x100 directly to an 8-bit value, and turns all the rest into * question marks. This can be done "in-place" because the resulting string * can only get smaller. */ static void UTF8ToAnsi (unsigned char *pUTF8) { unsigned char *pAnsi = pUTF8; unsigned short widechar = 0; int trail_bytes = 0; while (*pUTF8) { if (*pUTF8 & 0x80) { if (*pUTF8 & 0x40) { if (trail_bytes) { trail_bytes = 0; *pAnsi++ = widechar < 0x100 ? widechar : '?'; } else { char temp = *pUTF8; while (temp & 0x80) { trail_bytes++; temp <<= 1; } widechar = temp >> trail_bytes--; } } else if (trail_bytes) { widechar = (widechar << 6) | (*pUTF8 & 0x3f); if (!--trail_bytes) *pAnsi++ = widechar < 0x100 ? widechar : '?'; } } else *pAnsi++ = *pUTF8; pUTF8++; } *pAnsi = 0; } /* This function extracts the information stored in the Vorbis comment header * and stores it in id3v2buf of the current track. Currently the combined * lengths of title, genre, album, and artist must be no longer than 296 bytes * (the remaining 4 bytes are the null bytes at the end of the strings). This * is wrong, since vorbis comments can be up to 2^32 - 1 bytes long. In * practice I don't think this limitation will cause a problem. * * According to the docs, a vorbis bitstream *must* have a comment packet even * if that packet is empty. Therefore if this function returns false the * bitstream is corrupt and shouldn't be used. * * Additionally, vorbis comments *may* take up more than one Ogg page, and this * only looks at the first page of comments. */ static bool get_vorbis_comments (struct mp3entry *entry, size_t bytes_remaining, int fd) { int vendor_length; int comment_count; int comment_length; int i = 0; unsigned char temp[300]; int buffer_remaining = sizeof(entry->id3v2buf) + sizeof(entry->id3v1buf); char *buffer = entry->id3v2buf; char **p = NULL; /* We've read in all header info, now start reading comments */ /* Set id3v1 genre to 255 (effectively 'none'), otherwise tracks * without genre tags will show up as 'Blues' */ entry->genre=255; if (read(fd, &vendor_length, 4) < 4) { return false; } little_endian_to_native(&vendor_length, "L"); lseek(fd, vendor_length, SEEK_CUR); if (read(fd, &comment_count, 4) < 4) { return false; } little_endian_to_native(&comment_count, "L"); bytes_remaining -= (vendor_length + 8); if ( bytes_remaining <= 0 ) { return true; } for ( i = 0; i < comment_count; i++ ) { int name_length = 0; if (bytes_remaining < 4) { break; } bytes_remaining -= 4; if (read(fd, &comment_length, 4) < 4) { return false; } little_endian_to_native(&comment_length, "L"); /* Quit if we've passed the end of the page */ if ( bytes_remaining < (unsigned)comment_length ) { break; } bytes_remaining -= (comment_length); /* Skip comment if it won't fit in buffer */ if ( (unsigned int)comment_length >= sizeof(temp) ) { lseek(fd, comment_length, SEEK_CUR); continue; } if ( read(fd, temp, comment_length) < comment_length ) { return false; } temp[comment_length] = '\0'; UTF8ToAnsi(temp); comment_length = strlen(temp); if (strncasecmp(temp, "TITLE=", 6) == 0) { name_length = 5; p = &(entry->title); } else if (strncasecmp(temp, "ALBUM=", 6) == 0) { name_length = 5; p = &(entry->album); } else if (strncasecmp(temp, "ARTIST=", 7) == 0) { name_length = 6; p = &(entry->artist); } else if (strncasecmp(temp, "COMPOSER=", 9) == 0) { name_length = 8; p = &(entry->composer); } else if (strncasecmp(temp, "GENRE=", 6) == 0) { name_length = 5; p = &(entry->genre_string); } else if (strncasecmp(temp, "DATE=", 5) == 0) { name_length = 4; p = &(entry->year_string); } else if (strncasecmp(temp, "TRACKNUMBER=", 12) == 0) { name_length = 11; p = &(entry->track_string); } else { int value_length = parse_replaygain(temp, NULL, entry, buffer, buffer_remaining); buffer_remaining -= value_length; buffer += value_length; p = NULL; } if (p) { comment_length -= (name_length + 1); if ( comment_length < buffer_remaining ) { strncpy(buffer, temp + name_length + 1, comment_length); buffer[comment_length] = '\0'; *p = buffer; buffer += comment_length + 1; buffer_remaining -= comment_length + 1; } } } /* Skip to the end of the block */ if (bytes_remaining) { lseek(fd, bytes_remaining, SEEK_CUR); } return true; }