diff options
Diffstat (limited to 'libavformat/id3v2.c')
| -rw-r--r-- | libavformat/id3v2.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/libavformat/id3v2.c b/libavformat/id3v2.c index 018fd51dc8..a0581e6149 100644 --- a/libavformat/id3v2.c +++ b/libavformat/id3v2.c @@ -20,6 +20,8 @@ */ #include "id3v2.h" +#include "id3v1.h" +#include "libavutil/avstring.h" int ff_id3v2_match(const uint8_t *buf) { @@ -45,3 +47,148 @@ int ff_id3v2_tag_len(const uint8_t * buf) len += ID3v2_HEADER_SIZE; return len; } + +static unsigned int get_size(ByteIOContext *s, int len) +{ + int v=0; + while(len--) + v= (v<<7) + (get_byte(s)&0x7F); + return v; +} + +static void read_ttag(AVFormatContext *s, int taglen, const char *key) +{ + char *q, dst[512]; + int len, dstlen = sizeof(dst) - 1; + unsigned genre; + + dst[0]= 0; + if(taglen < 1) + return; + + taglen--; /* account for encoding type byte */ + + switch(get_byte(s->pb)) { /* encoding type */ + + case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */ + q = dst; + while(taglen--) { + uint8_t tmp; + PUT_UTF8(get_byte(s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;) + } + *q = '\0'; + break; + + case 3: /* UTF-8 */ + len = FFMIN(taglen, dstlen-1); + get_buffer(s->pb, dst, len); + dst[len] = 0; + break; + } + + if (!strcmp(key, "genre") + && (sscanf(dst, "(%d)", &genre) == 1 || sscanf(dst, "%d", &genre) == 1) + && genre <= ID3v1_GENRE_MAX) + av_strlcpy(dst, ff_id3v1_genre_str[genre], sizeof(dst)); + + if (*dst) + av_metadata_set(&s->metadata, key, dst); +} + +void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags) +{ + int isv34, tlen; + uint32_t tag; + int64_t next; + int taghdrlen; + const char *reason; + + switch(version) { + case 2: + if(flags & 0x40) { + reason = "compression"; + goto error; + } + isv34 = 0; + taghdrlen = 6; + break; + + case 3: + case 4: + isv34 = 1; + taghdrlen = 10; + break; + + default: + reason = "version"; + goto error; + } + + if(flags & 0x80) { + reason = "unsynchronization"; + goto error; + } + + if(isv34 && flags & 0x40) /* Extended header present, just skip over it */ + url_fskip(s->pb, get_size(s->pb, 4)); + + while(len >= taghdrlen) { + if(isv34) { + tag = get_be32(s->pb); + tlen = get_size(s->pb, 4); + get_be16(s->pb); /* flags */ + } else { + tag = get_be24(s->pb); + tlen = get_size(s->pb, 3); + } + len -= taghdrlen + tlen; + + if(len < 0) + break; + + next = url_ftell(s->pb) + tlen; + + switch(tag) { + case MKBETAG('T', 'I', 'T', '2'): + case MKBETAG(0, 'T', 'T', '2'): + read_ttag(s, tlen, "title"); + break; + case MKBETAG('T', 'P', 'E', '1'): + case MKBETAG(0, 'T', 'P', '1'): + read_ttag(s, tlen, "author"); + break; + case MKBETAG('T', 'A', 'L', 'B'): + case MKBETAG(0, 'T', 'A', 'L'): + read_ttag(s, tlen, "album"); + break; + case MKBETAG('T', 'C', 'O', 'N'): + case MKBETAG(0, 'T', 'C', 'O'): + read_ttag(s, tlen, "genre"); + break; + case MKBETAG('T', 'C', 'O', 'P'): + case MKBETAG(0, 'T', 'C', 'R'): + read_ttag(s, tlen, "copyright"); + break; + case MKBETAG('T', 'R', 'C', 'K'): + case MKBETAG(0, 'T', 'R', 'K'): + read_ttag(s, tlen, "track"); + break; + case 0: + /* padding, skip to end */ + url_fskip(s->pb, len); + len = 0; + continue; + } + /* Skip to end of tag */ + url_fseek(s->pb, next, SEEK_SET); + } + + if(version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */ + url_fskip(s->pb, 10); + return; + + error: + av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason); + url_fskip(s->pb, len); +} + |