diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/inputPlugins/mp3_plugin.c | 2 | ||||
| -rw-r--r-- | src/tag.c | 148 |
2 files changed, 138 insertions, 12 deletions
diff --git a/src/inputPlugins/mp3_plugin.c b/src/inputPlugins/mp3_plugin.c index 6fe9f3849..79215bcd9 100644 --- a/src/inputPlugins/mp3_plugin.c +++ b/src/inputPlugins/mp3_plugin.c @@ -252,7 +252,9 @@ void mp3_getReplayGainInfo(struct id3_tag * tag, ReplayGainInfo ** infoPtr) { *infoPtr = NULL; } } +#endif +#ifdef HAVE_ID3TAG static void mp3_parseId3Tag(mp3DecodeData * data, signed long tagsize, MpdTag ** mpdTag, ReplayGainInfo ** replayGainInfo) { struct id3_tag * id3Tag = NULL; id3_length_t count; @@ -43,6 +43,10 @@ #endif #ifdef HAVE_ID3TAG +#define isId3v1(tag) (id3_tag_options(tag, 0, 0) & ID3_TAG_OPTION_ID3V1) +/* Size of the buffer to use for peeking at tag headers. We reuse this buffer + if the whole tag fits in it, so make it big to avoid a malloc(). */ +#define ID3_TAG_BUFLEN 1024 #ifndef ID3_FRAME_COMPOSER #define ID3_FRAME_COMPOSER "TCOM" #endif @@ -181,29 +185,149 @@ MpdTag * parseId3Tag(struct id3_tag * tag) { } #endif -MpdTag * id3Dup(char * file) { - MpdTag * ret = NULL; #ifdef HAVE_ID3TAG - struct id3_file * id3_file; +static int fillBuffer(void *buf, size_t size, FILE *stream, + long offset, int whence) +{ + if (fseek(stream, offset, whence) != 0) return 0; + return fread(buf, 1, size, stream); +} +#endif + +#ifdef HAVE_ID3TAG +static int getId3v2FooterSize(FILE * stream, long offset, int whence) +{ + id3_byte_t buf[ID3_TAG_QUERYSIZE]; + int bufsize; + + bufsize = fillBuffer(buf, ID3_TAG_QUERYSIZE, stream, offset, whence); + if (bufsize <= 0) return 0; + return id3_tag_query(buf, bufsize); +} +#endif + +#ifdef HAVE_ID3TAG +static struct id3_tag * getId3Tag(FILE * stream, long offset, int whence) +{ struct id3_tag * tag; + id3_byte_t * buf[ID3_TAG_BUFLEN]; + id3_byte_t * mbuf; + int tagsize; + int bufsize; + int mbufsize; + + /* It's ok if we get less than we asked for */ + bufsize = fillBuffer(buf, ID3_TAG_BUFLEN, stream, offset, whence); + if (bufsize <= 0) return NULL; + + /* Look for a tag header */ + tagsize = id3_tag_query((const id3_byte_t *)buf, bufsize); + if (tagsize <= 0) return NULL; + + if (tagsize <= bufsize) { + /* Got an id3 tag, and it fits in buf */ + tag = id3_tag_parse((const id3_byte_t *)buf, tagsize); + } else { + /* Got an id3tag that overflows buf, so get a new one */ + mbuf = malloc(tagsize); + if (!mbuf) return NULL; + + mbufsize = fillBuffer(mbuf, tagsize, stream, offset, whence); + if (mbufsize < tagsize) { + free(mbuf); + return NULL; + } - id3_file = id3_file_open(file, ID3_FILE_MODE_READONLY); - - if(!id3_file) { - DEBUG("id3Dup: Failed to open file: '%s', %s\n",file, strerror(errno)); + tag = id3_tag_parse((const id3_byte_t *)mbuf, tagsize); + + free(mbuf); + } + + return tag; +} +#endif + +#ifdef HAVE_ID3TAG +static struct id3_tag * findId3TagFromBeginning(FILE * stream) +{ + struct id3_tag * tag; + struct id3_tag * seektag; + struct id3_frame * frame; + int seek; + + tag = getId3Tag(stream, 0, SEEK_SET); + if (!tag) { + return NULL; + } else if (isId3v1(tag)) { + /* id3v1 tags don't belong here */ + id3_tag_delete(tag); return NULL; } - tag = id3_file_tag(id3_file); - if(!tag) { - id3_file_close(id3_file); + /* We have an id3v2 tag, so let's look for SEEK frames */ + while ((frame = id3_tag_findframe(tag, "SEEK", 0))) { + /* Found a SEEK frame, get it's value */ + seek = id3_field_getint(id3_frame_field(frame, 0)); + if (seek < 0) break; + + /* Get the tag specified by the SEEK frame */ + seektag = getId3Tag(stream, seek, SEEK_CUR); + if (!seektag || isId3v1(seektag)) break; + + /* Replace the old tag with the new one */ + id3_tag_delete(tag); + tag = seektag; + } + + return tag; +} +#endif + +#ifdef HAVE_ID3TAG +static struct id3_tag * findId3TagFromEnd(FILE * stream) +{ + struct id3_tag * tag; + struct id3_tag * v1tag; + int tagsize; + + /* Get an id3v1 tag from the end of file for later use */ + v1tag = getId3Tag(stream, -128, SEEK_END); + + /* Get the id3v2 tag size from the footer (located before v1tag) */ + tagsize = getId3v2FooterSize(stream, (v1tag ? -128 : 0) - 10, SEEK_END); + if (tagsize >= 0) return v1tag; + + /* Get the tag which the footer belongs to */ + tag = getId3Tag(stream, tagsize, SEEK_CUR); + if (!tag) return v1tag; + + /* We have an id3v2 tag, so ditch v1tag */ + id3_tag_delete(v1tag); + + return tag; +} +#endif + +MpdTag * id3Dup(char * file) { + MpdTag * ret = NULL; +#ifdef HAVE_ID3TAG + struct id3_tag * tag; + FILE * stream; + + stream = fopen(file, "r"); + if (!stream) { + DEBUG("id3Dup: Failed to open file: '%s', %s\n",file, strerror(errno)); return NULL; } - ret = parseId3Tag(tag); + tag = findId3TagFromBeginning(stream); + if (!tag) tag = findId3TagFromEnd(stream); - id3_file_close(id3_file); + fclose(stream); + if (!tag) return NULL; + ret = parseId3Tag(tag); + id3_tag_delete(tag); #endif return ret; } |