| /*************************************************************************** |
| * __________ __ ___. |
| * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| * \/ \/ \/ \/ \/ |
| * $Id$ |
| * |
| * Copyright (C) 2002 by Daniel Stenberg |
| * |
| * 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. |
| * |
| ****************************************************************************/ |
| /* |
| * Parts of this code has been stolen from the Ample project and was written |
| * by David Härdeman. It has since been extended and enhanced pretty much by |
| * all sorts of friendly Rockbox people. |
| * |
| */ |
| |
| /* tagResolver and associated code copyright 2003 Thomas Paul Diffenbach |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <stdbool.h> |
| #include <stddef.h> |
| #include <ctype.h> |
| #include "config.h" |
| #include "file.h" |
| #include "debug.h" |
| #include "atoi.h" |
| |
| #include "id3.h" |
| #include "mp3data.h" |
| #include "system.h" |
| #include "replaygain.h" |
| #include "rbunicode.h" |
| |
| #define UNSYNC(b0,b1,b2,b3) (((long)(b0 & 0x7F) << (3*7)) | \ |
| ((long)(b1 & 0x7F) << (2*7)) | \ |
| ((long)(b2 & 0x7F) << (1*7)) | \ |
| ((long)(b3 & 0x7F) << (0*7))) |
| |
| #define BYTES2INT(b0,b1,b2,b3) (((long)(b0 & 0xFF) << (3*8)) | \ |
| ((long)(b1 & 0xFF) << (2*8)) | \ |
| ((long)(b2 & 0xFF) << (1*8)) | \ |
| ((long)(b3 & 0xFF) << (0*8))) |
| |
| static const char* const genres[] = { |
| "Blues", "Classic Rock", "Country", "Dance", "Disco", "Funk", "Grunge", |
| "Hip-Hop", "Jazz", "Metal", "New Age", "Oldies", "Other", "Pop", "R&B", |
| "Rap", "Reggae", "Rock", "Techno", "Industrial", "Alternative", "Ska", |
| "Death Metal", "Pranks", "Soundtrack", "Euro-Techno", "Ambient", "Trip-Hop", |
| "Vocal", "Jazz+Funk", "Fusion", "Trance", "Classical", "Instrumental", |
| "Acid", "House", "Game", "Sound Clip", "Gospel", "Noise", "AlternRock", |
| "Bass", "Soul", "Punk", "Space", "Meditative", "Instrumental Pop", |
| "Instrumental Rock", "Ethnic", "Gothic", "Darkwave", "Techno-Industrial", |
| "Electronic", "Pop-Folk", "Eurodance", "Dream", "Southern Rock", "Comedy", |
| "Cult", "Gangsta", "Top 40", "Christian Rap", "Pop/Funk", "Jungle", |
| "Native American", "Cabaret", "New Wave", "Psychadelic", "Rave", |
| "Showtunes", "Trailer", "Lo-Fi", "Tribal", "Acid Punk", "Acid Jazz", |
| "Polka", "Retro", "Musical", "Rock & Roll", "Hard Rock", |
| |
| /* winamp extensions */ |
| "Folk", "Folk-Rock", "National Folk", "Swing", "Fast Fusion", "Bebob", |
| "Latin", "Revival", "Celtic", "Bluegrass", "Avantgarde", "Gothic Rock", |
| "Progressive Rock", "Psychedelic Rock", "Symphonic Rock", "Slow Rock", |
| "Big Band", "Chorus", "Easy Listening", "Acoustic", "Humour", "Speech", |
| "Chanson", "Opera", "Chamber Music", "Sonata", "Symphony", "Booty Bass", |
| "Primus", "Porn Groove", "Satire", "Slow Jam", "Club", "Tango", "Samba", |
| "Folklore", "Ballad", "Power Ballad", "Rhythmic Soul", "Freestyle", |
| "Duet", "Punk Rock", "Drum Solo", "A capella", "Euro-House", "Dance Hall", |
| "Goa", "Drum & Bass", "Club-House", "Hardcore", "Terror", "Indie", |
| "BritPop", "Negerpunk", "Polsk Punk", "Beat", "Christian Gangsta Rap", |
| "Heavy Metal", "Black Metal", "Crossover", "Contemporary Christian", |
| "Christian Rock", "Merengue", "Salsa", "Trash Metal", "Anime", "Jpop", |
| "Synthpop" |
| }; |
| |
| static const char* const codec_labels[] = { |
| "???", /* Unknown file format */ |
| |
| "MP1", /* MPEG Audio layer 1 */ |
| "MP2", /* MPEG Audio layer 2 */ |
| "MP3", /* MPEG Audio layer 3 */ |
| |
| #if CONFIG_CODEC == SWCODEC |
| "WAV", /* Uncompressed PCM in a WAV file */ |
| "Ogg", /* Ogg Vorbis */ |
| "FLAC", /* FLAC */ |
| "MPC", /* Musepack */ |
| "AC3", /* A/52 (aka AC3) audio */ |
| "WV", /* WavPack */ |
| "ALAC", /* Apple Lossless Audio Codec */ |
| "AAC", /* Advanced Audio Coding in M4A container */ |
| "SHN", /* Shorten */ |
| #endif |
| }; |
| |
| char* id3_get_genre(const struct mp3entry* id3) |
| { |
| if( id3->genre_string ) |
| return id3->genre_string ; |
| |
| if (id3->genre < sizeof(genres)/sizeof(char*)) |
| return (char*)genres[id3->genre]; |
| return NULL; |
| } |
| |
| char* id3_get_codec(const struct mp3entry* id3) |
| { |
| if (id3->codectype < sizeof(codec_labels)/sizeof(char*)) { |
| return (char*)codec_labels[id3->codectype]; |
| } else { |
| return NULL; |
| } |
| } |
| |
| /* |
| HOW TO ADD ADDITIONAL ID3 VERSION 2 TAGS |
| Code and comments by Thomas Paul Diffenbach |
| |
| To add another ID3v2 Tag, do the following: |
| 1. add a char* named for the tag to struct mp3entry in id3.h, |
| (I (tpd) prefer to use char* rather than ints, even for what seems like |
| numerical values, for cases where a number won't do, e.g., |
| YEAR: "circa 1765", "1790/1977" (composed/performed), "28 Feb 1969" |
| TRACK: "1/12", "1 of 12", GENRE: "Freeform genre name" |
| Text is more flexible, and as the main use of id3 data is to |
| display it, converting it to an int just means reconverting to |
| display it, at a runtime cost.) |
| |
| 2. If any special processing beyond copying the tag value from the Id3 |
| block to the struct mp3entry is rrequired (such as converting to an |
| int), write a function to perform this special processing. |
| |
| This function's prototype must match that of |
| typedef tagPostProcessFunc, that is it must be: |
| int func( struct mp3entry*, char* tag, int bufferpos ) |
| the first argument is a pointer to the current mp3entry structure the |
| second argument is a pointer to the null terminated string value of the |
| tag found the third argument is the offset of the next free byte in the |
| mp3entry's buffer your function should return the corrected offset; if |
| you don't lengthen or shorten the tag string, you can return the third |
| argument unchanged. |
| |
| Unless you have a good reason no to, make the function static. |
| TO JUST COPY THE TAG NO SPECIAL PROCESSING FUNCTION IS NEEDED. |
| |
| 3. add one or more entries to the tagList array, using the format: |
| char* ID3 Tag symbolic name -- see the ID3 specification for these, |
| sizeof() that name minus 1, |
| offsetof( struct mp3entry, variable_name_in_struct_mp3entry ), |
| pointer to your special processing function or NULL |
| if you need no special processing |
| Many ID3 symbolic names come in more than one form. You can add both |
| forms, each referencing the same variable in struct mp3entry. |
| If both forms are present, the last found will be used. |
| Note that the offset can be zero, in which case no entry will be set |
| in the mp3entry struct; the frame is still read into the buffer and |
| the special processing function is called (several times, if there |
| are several frames with the same name). |
| |
| 4. Alternately, use the TAG_LIST_ENTRY macro with |
| ID3 tag symbolic name, |
| variable in struct mp3entry, |
| special processing function address |
| |
| 5. Add code to wps-display.c function get_tag to assign a printf-like |
| format specifier for the tag */ |
| |
| /* Structure for ID3 Tag extraction information */ |
| struct tag_resolver { |
| const char* tag; |
| int tag_length; |
| size_t offset; |
| int (*ppFunc)(struct mp3entry*, char* tag, int bufferpos); |
| }; |
| |
| static bool global_ff_found; |
| |
| static int unsynchronize(char* tag, int len, bool *ff_found) |
| { |
| int i; |
| unsigned char c; |
| unsigned char *rp, *wp; |
| |
| wp = rp = (unsigned char *)tag; |
| |
| rp = (unsigned char *)tag; |
| for(i = 0;i < len;i++) { |
| /* Read the next byte and write it back, but don't increment the |
| write pointer */ |
| c = *rp++; |
| *wp = c; |
| if(*ff_found) { |
| /* Increment the write pointer if it isn't an unsynch pattern */ |
| if(c != 0) |
| wp++; |
| *ff_found = false; |
| } else { |
| if(c == 0xff) |
| *ff_found = true; |
| wp++; |
| } |
| } |
| return (long)wp - (long)tag; |
| } |
| |
| static int unsynchronize_frame(char* tag, int len) |
| { |
| bool ff_found = false; |
| |
| return unsynchronize(tag, len, &ff_found); |
| } |
| |
| static int read_unsynched(int fd, void *buf, int len) |
| { |
| int i; |
| int rc; |
| int remaining = len; |
| char *wp; |
| char *rp; |
| |
| wp = buf; |
| |
| while(remaining) { |
| rp = wp; |
| rc = read(fd, rp, remaining); |
| if(rc < 0) |
| return rc; |
| |
| i = unsynchronize(wp, remaining, &global_ff_found); |
| remaining -= i; |
| wp += i; |
| } |
| |
| return len; |
| } |
| |
| static int skip_unsynched(int fd, int len) |
| { |
| int rc; |
| int remaining = len; |
| int rlen; |
| char buf[32]; |
| |
| while(remaining) { |
| rlen = MIN(sizeof(buf), (unsigned int)remaining); |
| rc = read(fd, buf, rlen); |
| if(rc < 0) |
| return rc; |
| |
| remaining -= unsynchronize(buf, rlen, &global_ff_found); |
| } |
| |
| return len; |
| } |
| |
| /* parse numeric value from string */ |
| static int parsetracknum( struct mp3entry* entry, char* tag, int bufferpos ) |
| { |
| entry->tracknum = atoi( tag ); |
| return bufferpos; |
| } |
| |
| /* parse numeric value from string */ |
| static int parseyearnum( struct mp3entry* entry, char* tag, int bufferpos ) |
| { |
| entry->year = atoi( tag ); |
| return bufferpos; |
| } |
| |
| /* parse numeric genre from string, version 2.2 and 2.3 */ |
| static int parsegenre( struct mp3entry* entry, char* tag, int bufferpos ) |
| { |
| if(entry->id3version >= ID3_VER_2_4) { |
| /* In version 2.4 and up, there are no parentheses, and the genre frame |
| is a list of strings, either numbers or text. */ |
| |
| /* Is it a number? */ |
| if(isdigit(tag[0])) { |
| entry->genre = atoi( tag ); |
| entry->genre_string = 0; |
| return tag - entry->id3v2buf; |
| } else { |
| entry->genre_string = tag; |
| entry->genre = 0xff; |
| return bufferpos; |
| } |
| } else { |
| if( tag[0] == '(' && tag[1] != '(' ) { |
| entry->genre = atoi( tag + 1 ); |
| entry->genre_string = 0; |
| return tag - entry->id3v2buf; |
| } |
| else { |
| entry->genre_string = tag; |
| entry->genre = 0xff; |
| return bufferpos; |
| } |
| } |
| } |
| |
| #if CONFIG_CODEC == SWCODEC |
| /* parse user defined text, looking for replaygain information. */ |
| static int parseuser( struct mp3entry* entry, char* tag, int bufferpos ) |
| { |
| char* value = NULL; |
| int desc_len = strlen(tag); |
| int value_len = 0; |
| |
| if ((tag - entry->id3v2buf + desc_len + 2) < bufferpos) { |
| /* At least part of the value was read, so we can safely try to |
| * parse it |
| */ |
| |
| value = tag + desc_len + 1; |
| value_len = parse_replaygain(tag, value, entry, tag, |
| bufferpos - (tag - entry->id3v2buf)); |
| } |
| |
| if (value_len) { |
| bufferpos = tag - entry->id3v2buf + value_len; |
| } else { |
| bufferpos = tag - entry->id3v2buf; |
| } |
| |
| return bufferpos; |
| } |
| #endif |
| |
| static const struct tag_resolver taglist[] = { |
| { "TPE1", 4, offsetof(struct mp3entry, artist), NULL }, |
| { "TP1", 3, offsetof(struct mp3entry, artist), NULL }, |
| { "TIT2", 4, offsetof(struct mp3entry, title), NULL }, |
| { "TT2", 3, offsetof(struct mp3entry, title), NULL }, |
| { "TALB", 4, offsetof(struct mp3entry, album), NULL }, |
| { "TAL", 3, offsetof(struct mp3entry, album), NULL }, |
| { "TRK", 3, offsetof(struct mp3entry, track_string), &parsetracknum }, |
| { "TRCK", 4, offsetof(struct mp3entry, track_string), &parsetracknum }, |
| { "TYER", 4, offsetof(struct mp3entry, year_string), &parseyearnum }, |
| { "TYE", 3, offsetof(struct mp3entry, year_string), &parseyearnum }, |
| { "TCOM", 4, offsetof(struct mp3entry, composer), NULL }, |
| { "TCON", 4, offsetof(struct mp3entry, genre_string), &parsegenre }, |
| { "TCO", 3, offsetof(struct mp3entry, genre_string), &parsegenre }, |
| #if CONFIG_CODEC == SWCODEC |
| { "TXXX", 4, 0, &parseuser }, |
| #endif |
| }; |
| |
| #define TAGLIST_SIZE ((int)(sizeof(taglist) / sizeof(taglist[0]))) |
| |
| /* Checks to see if the passed in string is a 16-bit wide Unicode v2 |
| string. If it is, we convert it to a UTF-8 string. If it's not unicode, |
| we convert from the default codepage */ |
| static int unicode_munge(char* string, char* utf8buf, int *len) { |
| long tmp; |
| bool le = false; |
| int i = 0; |
| char *str = string; |
| int templen = 0; |
| char* utf8 = utf8buf; |
| |
| switch (str[0]) { |
| case 0x00: /* Type 0x00 is ordinary ISO 8859-1 */ |
| str++; |
| (*len)--; |
| utf8 = iso_decode(str, utf8, -1, *len); |
| *utf8 = 0; |
| *len = strlen(utf8buf); |
| break; |
| |
| case 0x01: /* Unicode with or without BOM */ |
| case 0x02: |
| (*len)--; |
| str++; |
| |
| /* Handle frames with more than one string |
| (needed for TXXX frames).*/ |
| do { |
| tmp = BYTES2INT(0, 0, str[0], str[1]); |
| |
| /* Now check if there is a BOM |
| (zero-width non-breaking space, 0xfeff) |
| and if it is in little or big endian format */ |
| if(tmp == 0xfffe) { /* Little endian? */ |
| le = true; |
| str += 2; |
| (*len)-=2; |
| } else if(tmp == 0xfeff) { /* Big endian? */ |
| str += 2; |
| (*len)-=2; |
| } else |
| /* If there is no BOM (which is a specification violation), |
| let's try to guess it. If one of the bytes is 0x00, it is |
| probably the most significant one. */ |
| if(str[1] == 0) |
| le = true; |
| |
| do { |
| if(le) |
| utf8 = utf16LEdecode(str, utf8, 1); |
| else |
| utf8 = utf16BEdecode(str, utf8, 1); |
| |
| str+=2; |
| i += 2; |
| } while((str[0] || str[1]) && (i < *len)); |
| |
| *utf8++ = 0; /* Terminate the string */ |
| templen += (strlen(&utf8buf[templen]) + 1); |
| str += 2; |
| i+=2; |
| } while(i < *len); |
| *len = templen - 1; |
| break; |
| |
| case 0x03: /* UTF-8 encoded string */ |
| for(i=0; i < *len; i++) |
| utf8[i] = str[i+1]; |
| *len = strlen(utf8buf); |
| break; |
| |
| default: /* Plain old string */ |
| utf8 = iso_decode(str, utf8, -1, *len); |
| *utf8 = 0; |
| *len = strlen(utf8buf); |
| break; |
| } |
| return 0; |
| } |
| |
| /* |
| * Sets the title of an MP3 entry based on its ID3v1 tag. |
| * |
| * Arguments: file - the MP3 file to scen for a ID3v1 tag |
| * entry - the entry to set the title in |
| * |
| * Returns: true if a title was found and created, else false |
| */ |
| static bool setid3v1title(int fd, struct mp3entry *entry) |
| { |
| unsigned char buffer[128]; |
| static const char offsets[] = {3, 33, 63, 93, 125, 127}; |
| int i, j; |
| unsigned char* utf8; |
| |
| if (-1 == lseek(fd, -128, SEEK_END)) |
| return false; |
| |
| if (read(fd, buffer, sizeof buffer) != sizeof buffer) |
| return false; |
| |
| if (strncmp((char *)buffer, "TAG", 3)) |
| return false; |
| |
| entry->id3v1len = 128; |
| entry->id3version = ID3_VER_1_0; |
| |
| for (i=0; i < (int)sizeof offsets; i++) { |
| unsigned char* ptr = (unsigned char *)buffer + offsets[i]; |
| |
| if (i<3) { |
| /* kill trailing space in strings */ |
| for (j=29; j && ptr[j]==' '; j--) |
| ptr[j] = 0; |
| } |
| |
| switch(i) { |
| case 0: |
| case 1: |
| case 2: |
| /* convert string to utf8 */ |
| utf8 = entry->id3v1buf[i]; |
| utf8 = iso_decode(ptr, utf8, -1, 30); |
| /* make sure string is terminated */ |
| *utf8 = 0; |
| break; |
| |
| case 3: |
| ptr[4] = 0; |
| entry->year = atoi(ptr); |
| break; |
| |
| case 4: |
| /* id3v1.1 uses last two bytes of comment field for track |
| number: first must be 0 and second is track num */ |
| if (!ptr[0] && ptr[1]) { |
| entry->tracknum = ptr[1]; |
| entry->id3version = ID3_VER_1_1; |
| } |
| break; |
| |
| case 5: |
| /* genre */ |
| entry->genre = ptr[0]; |
| break; |
| } |
| } |
| |
| entry->title = entry->id3v1buf[0]; |
| entry->artist = entry->id3v1buf[1]; |
| entry->album = entry->id3v1buf[2]; |
| |
| return true; |
| } |
| |
| |
| /* |
| * Sets the title of an MP3 entry based on its ID3v2 tag. |
| * |
| * Arguments: file - the MP3 file to scan for a ID3v2 tag |
| * entry - the entry to set the title in |
| * |
| * Returns: true if a title was found and created, else false |
| */ |
| static void setid3v2title(int fd, struct mp3entry *entry) |
| { |
| int minframesize; |
| int size; |
| long bufferpos = 0, totframelen, framelen; |
| char header[10]; |
| char tmp[4]; |
| unsigned char version; |
| char *buffer = entry->id3v2buf; |
| int bytesread = 0; |
| int buffersize = sizeof(entry->id3v2buf); |
| unsigned char global_flags; |
| int flags; |
| int skip; |
| bool global_unsynch = false; |
| bool unsynch = false; |
| int data_length_ind; |
| int i, j; |
| int rc; |
| |
| global_ff_found = false; |
| |
| /* Bail out if the tag is shorter than 10 bytes */ |
| if(entry->id3v2len < 10) |
| return; |
| |
| /* Read the ID3 tag version from the header */ |
| lseek(fd, 0, SEEK_SET); |
| if(10 != read(fd, header, 10)) |
| return; |
| |
| /* Get the total ID3 tag size */ |
| size = entry->id3v2len - 10; |
| |
| version = header[3]; |
| switch ( version ) { |
| case 2: |
| version = ID3_VER_2_2; |
| minframesize = 8; |
| break; |
| |
| case 3: |
| version = ID3_VER_2_3; |
| minframesize = 12; |
| break; |
| |
| case 4: |
| version = ID3_VER_2_4; |
| minframesize = 12; |
| break; |
| |
| default: |
| /* unsupported id3 version */ |
| return; |
| } |
| entry->id3version = version; |
| entry->tracknum = entry->year = 0; |
| entry->genre = 0xff; |
| entry->title = entry->artist = entry->album = NULL; |
| |
| global_flags = header[5]; |
| |
| /* Skip the extended header if it is present */ |
| if(global_flags & 0x40) { |
| if(version == ID3_VER_2_3) { |
| if(10 != read(fd, header, 10)) |
| return; |
| /* The 2.3 extended header size doesn't include the following |
| data, so we have to find out the size by checking the flags. |
| Also, it is not unsynched. */ |
| framelen = BYTES2INT(header[0], header[1], header[2], header[3]) + |
| BYTES2INT(header[6], header[7], header[8], header[9]); |
| flags = BYTES2INT(0, 0, header[4], header[5]); |
| if(flags & 0x8000) |
| framelen += 4; /* CRC */ |
| |
| lseek(fd, framelen - 10, SEEK_CUR); |
| } |
| |
| if(version >= ID3_VER_2_4) { |
| if(4 != read(fd, header, 4)) |
| return; |
| |
| /* The 2.4 extended header size does include the entire header, |
| so here we can just skip it. This header is unsynched. */ |
| framelen = UNSYNC(header[0], header[1], |
| header[2], header[3]); |
| |
| lseek(fd, framelen - 4, SEEK_CUR); |
| } |
| } |
| |
| /* Is unsynchronization applied? */ |
| if(global_flags & 0x80) { |
| global_unsynch = true; |
| } |
| |
| /* |
| * We must have at least minframesize bytes left for the |
| * remaining frames to be interesting |
| */ |
| while (size >= minframesize && bufferpos < buffersize - 1) { |
| flags = 0; |
| |
| /* Read frame header and check length */ |
| if(version >= ID3_VER_2_3) { |
| if(global_unsynch && version <= ID3_VER_2_3) |
| rc = read_unsynched(fd, header, 10); |
| else |
| rc = read(fd, header, 10); |
| if(rc != 10) |
| return; |
| /* Adjust for the 10 bytes we read */ |
| size -= 10; |
| |
| flags = BYTES2INT(0, 0, header[8], header[9]); |
| |
| if (version >= ID3_VER_2_4) { |
| framelen = UNSYNC(header[4], header[5], |
| header[6], header[7]); |
| } else { |
| /* version .3 files don't use synchsafe ints for |
| * size */ |
| framelen = BYTES2INT(header[4], header[5], |
| header[6], header[7]); |
| } |
| } else { |
| if(6 != read(fd, header, 6)) |
| return; |
| /* Adjust for the 6 bytes we read */ |
| size -= 6; |
| |
| framelen = BYTES2INT(0, header[3], header[4], header[5]); |
| } |
| |
| /* Keep track of the total size */ |
| totframelen = framelen; |
| |
| DEBUGF("framelen = %d\n", framelen); |
| if(framelen == 0){ |
| if (header[0] == 0 && header[1] == 0 && header[2] == 0) |
| return; |
| else |
| continue; |
| } |
| |
| unsynch = false; |
| data_length_ind = 0; |
| |
| if(flags) |
| { |
| skip = 0; |
| |
| if (version >= ID3_VER_2_4) { |
| if(flags & 0x0040) { /* Grouping identity */ |
| lseek(fd, 1, SEEK_CUR); /* Skip 1 byte */ |
| framelen--; |
| } |
| } else { |
| if(flags & 0x0020) { /* Grouping identity */ |
| lseek(fd, 1, SEEK_CUR); /* Skip 1 byte */ |
| framelen--; |
| } |
| } |
| |
| if(flags & 0x000c) /* Compression or encryption */ |
| { |
| /* Skip it using the total size in case |
| it was truncated */ |
| size -= totframelen; |
| lseek(fd, totframelen, SEEK_CUR); |
| continue; |
| } |
| |
| if(flags & 0x0002) /* Unsynchronization */ |
| unsynch = true; |
| |
| if (version >= ID3_VER_2_4) { |
| if(flags & 0x0001) { /* Data length indicator */ |
| if(4 != read(fd, tmp, 4)) |
| return; |
| |
| data_length_ind = UNSYNC(tmp[0], tmp[1], tmp[2], tmp[3]); |
| framelen -= 4; |
| } |
| } |
| } |
| |
| /* If the frame is larger than the remaining buffer space we try |
| to read as much as would fit in the buffer */ |
| if(framelen >= buffersize - bufferpos) |
| framelen = buffersize - bufferpos - 1; |
| |
| DEBUGF("id3v2 frame: %.4s\n", header); |
| |
| /* Check for certain frame headers |
| |
| 'size' is the amount of frame bytes remaining. We decrement it by |
| the amount of bytes we read. If we fail to read as many bytes as |
| we expect, we assume that we can't read from this file, and bail |
| out. |
| |
| For each frame. we will iterate over the list of supported tags, |
| and read the tag into entry's buffer. All tags will be kept as |
| strings, for cases where a number won't do, e.g., YEAR: "circa |
| 1765", "1790/1977" (composed/performed), "28 Feb 1969" TRACK: |
| "1/12", "1 of 12", GENRE: "Freeform genre name" Text is more |
| flexible, and as the main use of id3 data is to display it, |
| converting it to an int just means reconverting to display it, at a |
| runtime cost. |
| |
| For tags that the current code does convert to ints, a post |
| processing function will be called via a pointer to function. */ |
| |
| for (i=0; i<TAGLIST_SIZE; i++) { |
| const struct tag_resolver* tr = &taglist[i]; |
| char** ptag = tr->offset ? (char**) (((char*)entry) + tr->offset) |
| : NULL; |
| char* tag; |
| |
| /* Only ID3_VER_2_2 uses frames with three-character names. */ |
| if (((version == ID3_VER_2_2) && (tr->tag_length != 3)) |
| || ((version > ID3_VER_2_2) && (tr->tag_length != 4))) { |
| continue; |
| } |
| |
| /* Note that parser functions sometimes set *ptag to NULL, so |
| * the "!*ptag" check here doesn't always have the desired |
| * effect. Should the parser functions (parsegenre in |
| * particular) be updated to handle the case of being called |
| * multiple times, or should the "*ptag" check be removed? |
| */ |
| if( (!ptag || !*ptag) && !memcmp( header, tr->tag, tr->tag_length ) ) { |
| |
| /* found a tag matching one in tagList, and not yet filled */ |
| tag = buffer + bufferpos; |
| |
| if(global_unsynch && version <= ID3_VER_2_3) |
| bytesread = read_unsynched(fd, tag, framelen); |
| else |
| bytesread = read(fd, tag, framelen); |
| |
| if( bytesread != framelen ) |
| return; |
| |
| size -= bytesread; |
| |
| if(unsynch || (global_unsynch && version >= ID3_VER_2_4)) |
| bytesread = unsynchronize_frame(tag, bytesread); |
| |
| |
| /* UTF-8 could potentially be 3 times larger */ |
| /* so we need to create a new buffer */ |
| char utf8buf[(3 * bytesread) + 1]; |
| |
| unicode_munge( tag, utf8buf, &bytesread ); |
| |
| if(bytesread >= buffersize - bufferpos) |
| bytesread = buffersize - bufferpos - 1; |
| |
| for (j = 0; j < bytesread; j++) |
| tag[j] = utf8buf[j]; |
| |
| if (ptag) |
| *ptag = tag; |
| |
| /* remove trailing spaces */ |
| while ( bytesread > 0 && isspace(tag[bytesread-1])) |
| bytesread--; |
| tag[bytesread] = 0; |
| bufferpos += bytesread + 1; |
| |
| if( tr->ppFunc ) |
| bufferpos = tr->ppFunc(entry, tag, bufferpos); |
| |
| /* Seek to the next frame */ |
| if(framelen < totframelen) |
| lseek(fd, totframelen - framelen, SEEK_CUR); |
| break; |
| } |
| } |
| |
| if( i == TAGLIST_SIZE ) { |
| /* no tag in tagList was found, or it was a repeat. |
| skip it using the total size */ |
| |
| if(global_unsynch && version <= ID3_VER_2_3) { |
| size -= skip_unsynched(fd, totframelen); |
| } else { |
| if(data_length_ind) |
| totframelen = data_length_ind; |
| |
| size -= totframelen; |
| if( lseek(fd, totframelen, SEEK_CUR) == -1 ) |
| return; |
| } |
| } |
| } |
| } |
| |
| /* |
| * Calculates the size of the ID3v2 tag. |
| * |
| * Arguments: file - the file to search for a tag. |
| * |
| * Returns: the size of the tag or 0 if none was found |
| */ |
| int getid3v2len(int fd) |
| { |
| char buf[6]; |
| int offset; |
| |
| /* Make sure file has a ID3 tag */ |
| if((-1 == lseek(fd, 0, SEEK_SET)) || |
| (read(fd, buf, 6) != 6) || |
| (strncmp(buf, "ID3", strlen("ID3")) != 0)) |
| offset = 0; |
| |
| /* Now check what the ID3v2 size field says */ |
| else |
| if(read(fd, buf, 4) != 4) |
| offset = 0; |
| else |
| offset = UNSYNC(buf[0], buf[1], buf[2], buf[3]) + 10; |
| |
| DEBUGF("ID3V2 Length: 0x%x\n", offset); |
| return offset; |
| } |
| |
| /* |
| * Calculates the length (in milliseconds) of an MP3 file. |
| * |
| * Modified to only use integers. |
| * |
| * Arguments: file - the file to calculate the length upon |
| * entry - the entry to update with the length |
| * |
| * Returns: the song length in milliseconds, |
| * 0 means that it couldn't be calculated |
| */ |
| static int getsonglength(int fd, struct mp3entry *entry) |
| { |
| unsigned long filetime = 0; |
| struct mp3info info; |
| long bytecount; |
| |
| /* Start searching after ID3v2 header */ |
| if(-1 == lseek(fd, entry->id3v2len, SEEK_SET)) |
| return 0; |
| |
| bytecount = get_mp3file_info(fd, &info); |
| |
| DEBUGF("Space between ID3V2 tag and first audio frame: 0x%x bytes\n", |
| bytecount); |
| |
| if(bytecount < 0) |
| return -1; |
| |
| bytecount += entry->id3v2len; |
| |
| entry->bitrate = info.bitrate; |
| entry->frequency = info.frequency; |
| entry->version = info.version; |
| entry->layer = info.layer; |
| switch(entry->layer) { |
| #if CONFIG_CODEC==SWCODEC |
| case 0: |
| entry->codectype=AFMT_MPA_L1; |
| break; |
| #endif |
| case 1: |
| entry->codectype=AFMT_MPA_L2; |
| break; |
| case 2: |
| entry->codectype=AFMT_MPA_L3; |
| break; |
| } |
| |
| /* If the file time hasn't been established, this may be a fixed |
| rate MP3, so just use the default formula */ |
| |
| filetime = info.file_time; |
| |
| if(filetime == 0) |
| { |
| filetime = (entry->filesize - bytecount) / (info.bitrate / 8); |
| /* bitrate is in kbps so this delivers milliseconds. Doing bitrate / 8 |
| * instead of filesize * 8 is exact, because mpeg audio bitrates are |
| * always multiples of 8, and it avoids overflows. */ |
| } |
| |
| entry->frame_count = info.frame_count; |
| |
| entry->vbr = info.is_vbr; |
| entry->has_toc = info.has_toc; |
| |
| entry->lead_trim = info.enc_delay; |
| entry->tail_trim = info.enc_padding; |
| |
| memcpy(entry->toc, info.toc, sizeof(info.toc)); |
| |
| entry->vbr_header_pos = info.vbr_header_pos; |
| |
| /* Update the seek point for the first playable frame */ |
| entry->first_frame_offset = bytecount; |
| DEBUGF("First frame is at %x\n", entry->first_frame_offset); |
| |
| return filetime; |
| } |
| |
| /* |
| * Checks all relevant information (such as ID3v1 tag, ID3v2 tag, length etc) |
| * about an MP3 file and updates it's entry accordingly. |
| * |
| */ |
| bool mp3info(struct mp3entry *entry, const char *filename, bool v1first) |
| { |
| int fd; |
| int v1found = false; |
| |
| fd = open(filename, O_RDONLY); |
| if(-1 == fd) |
| return true; |
| |
| #if CONFIG_CODEC != SWCODEC |
| memset(entry, 0, sizeof(struct mp3entry)); |
| #endif |
| |
| strncpy(entry->path, filename, sizeof(entry->path)); |
| |
| entry->title = NULL; |
| entry->filesize = filesize(fd); |
| entry->id3v2len = getid3v2len(fd); |
| entry->tracknum = 0; |
| entry->genre = 0xff; |
| |
| if(v1first) |
| v1found = setid3v1title(fd, entry); |
| |
| if (!v1found && entry->id3v2len) |
| setid3v2title(fd, entry); |
| entry->length = getsonglength(fd, entry); |
| |
| /* Subtract the meta information from the file size to get |
| the true size of the MP3 stream */ |
| entry->filesize -= entry->first_frame_offset; |
| |
| /* only seek to end of file if no id3v2 tags were found, |
| and we already haven't looked for a v1 tag */ |
| if (!v1first && !entry->id3v2len) { |
| setid3v1title(fd, entry); |
| } |
| |
| close(fd); |
| |
| if(!entry->length || (entry->filesize < 8 )) |
| /* no song length or less than 8 bytes is hereby considered to be an |
| invalid mp3 and won't be played by us! */ |
| return true; |
| |
| return false; |
| } |
| |
| #ifdef DEBUG_STANDALONE |
| |
| char *secs2str(int ms) |
| { |
| static char buffer[32]; |
| int secs = ms/1000; |
| ms %= 1000; |
| snprintf(buffer, sizeof(buffer), "%d:%02d.%d", secs/60, secs%60, ms/100); |
| return buffer; |
| } |
| |
| int main(int argc, char **argv) |
| { |
| int i; |
| for(i=1; i<argc; i++) { |
| struct mp3entry mp3; |
| mp3.album = "Bogus"; |
| if(mp3info(&mp3, argv[i], false)) { |
| printf("Failed to get %s\n", argv[i]); |
| return 0; |
| } |
| |
| printf("****** File: %s\n" |
| " Title: %s\n" |
| " Artist: %s\n" |
| " Album: %s\n" |
| " Genre: %s (%d) \n" |
| " Composer: %s\n" |
| " Year: %s (%d)\n" |
| " Track: %s (%d)\n" |
| " Length: %s / %d s\n" |
| " Bitrate: %d\n" |
| " Frequency: %d\n", |
| argv[i], |
| mp3.title?mp3.title:"<blank>", |
| mp3.artist?mp3.artist:"<blank>", |
| mp3.album?mp3.album:"<blank>", |
| mp3.genre_string?mp3.genre_string:"<blank>", |
| mp3.genre, |
| mp3.composer?mp3.composer:"<blank>", |
| mp3.year_string?mp3.year_string:"<blank>", |
| mp3.year, |
| mp3.track_string?mp3.track_string:"<blank>", |
| mp3.tracknum, |
| secs2str(mp3.length), |
| mp3.length/1000, |
| mp3.bitrate, |
| mp3.frequency); |
| } |
| |
| return 0; |
| } |
| |
| #endif |