* ID3v2 header parser
* Copyright (c) 2003 Fabrice Bellard
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "id3v2.h"
+#include "id3v1.h"
+#include "libavutil/avstring.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/dict.h"
+#include "avio_internal.h"
-int ff_id3v2_match(const uint8_t *buf)
+int ff_id3v2_match(const uint8_t *buf, const char * magic)
{
- return buf[0] == 'I' &&
- buf[1] == 'D' &&
- buf[2] == '3' &&
- buf[3] != 0xff &&
- buf[4] != 0xff &&
- (buf[6] & 0x80) == 0 &&
- (buf[7] & 0x80) == 0 &&
- (buf[8] & 0x80) == 0 &&
- (buf[9] & 0x80) == 0;
+ return buf[0] == magic[0] &&
+ buf[1] == magic[1] &&
+ buf[2] == magic[2] &&
+ buf[3] != 0xff &&
+ buf[4] != 0xff &&
+ (buf[6] & 0x80) == 0 &&
+ (buf[7] & 0x80) == 0 &&
+ (buf[8] & 0x80) == 0 &&
+ (buf[9] & 0x80) == 0;
}
+
+int ff_id3v2_tag_len(const uint8_t * buf)
+{
+ int len = ((buf[6] & 0x7f) << 21) +
+ ((buf[7] & 0x7f) << 14) +
+ ((buf[8] & 0x7f) << 7) +
+ (buf[9] & 0x7f) +
+ ID3v2_HEADER_SIZE;
+ if (buf[5] & 0x10)
+ len += ID3v2_HEADER_SIZE;
+ return len;
+}
+
+static unsigned int get_size(AVIOContext *s, int len)
+{
+ int v = 0;
+ while (len--)
+ v = (v << 7) + (avio_r8(s) & 0x7F);
+ return v;
+}
+
+static void read_ttag(AVFormatContext *s, AVIOContext *pb, int taglen, const char *key)
+{
+ char *q, dst[512];
+ const char *val = NULL;
+ int len, dstlen = sizeof(dst) - 1;
+ unsigned genre;
+ unsigned int (*get)(AVIOContext*) = avio_rb16;
+
+ dst[0] = 0;
+ if (taglen < 1)
+ return;
+
+ taglen--; /* account for encoding type byte */
+
+ switch (avio_r8(pb)) { /* encoding type */
+
+ case ID3v2_ENCODING_ISO8859:
+ q = dst;
+ while (taglen-- && q - dst < dstlen - 7) {
+ uint8_t tmp;
+ PUT_UTF8(avio_r8(pb), tmp, *q++ = tmp;)
+ }
+ *q = 0;
+ break;
+
+ case ID3v2_ENCODING_UTF16BOM:
+ taglen -= 2;
+ switch (avio_rb16(pb)) {
+ case 0xfffe:
+ get = avio_rl16;
+ case 0xfeff:
+ break;
+ default:
+ av_log(s, AV_LOG_ERROR, "Incorrect BOM value in tag %s.\n", key);
+ return;
+ }
+ // fall-through
+
+ case ID3v2_ENCODING_UTF16BE:
+ q = dst;
+ while (taglen > 1 && q - dst < dstlen - 7) {
+ uint32_t ch;
+ uint8_t tmp;
+
+ GET_UTF16(ch, ((taglen -= 2) >= 0 ? get(pb) : 0), break;)
+ PUT_UTF8(ch, tmp, *q++ = tmp;)
+ }
+ *q = 0;
+ break;
+
+ case ID3v2_ENCODING_UTF8:
+ len = FFMIN(taglen, dstlen);
+ avio_read(pb, dst, len);
+ dst[len] = 0;
+ break;
+ default:
+ av_log(s, AV_LOG_WARNING, "Unknown encoding in tag %s.\n", key);
+ }
+
+ if (!(strcmp(key, "TCON") && strcmp(key, "TCO"))
+ && (sscanf(dst, "(%d)", &genre) == 1 || sscanf(dst, "%d", &genre) == 1)
+ && genre <= ID3v1_GENRE_MAX)
+ val = ff_id3v1_genre_str[genre];
+ else if (!(strcmp(key, "TXXX") && strcmp(key, "TXX"))) {
+ /* dst now contains two 0-terminated strings */
+ dst[dstlen] = 0;
+ len = strlen(dst);
+ key = dst;
+ val = dst + FFMIN(len + 1, dstlen);
+ }
+ else if (*dst)
+ val = dst;
+
+ if (val)
+ av_dict_set(&s->metadata, key, val, AV_DICT_DONT_OVERWRITE);
+}
+
+static int is_number(const char *str)
+{
+ while (*str >= '0' && *str <= '9') str++;
+ return !*str;
+}
+
+static AVDictionaryEntry* get_date_tag(AVDictionary *m, const char *tag)
+{
+ AVDictionaryEntry *t;
+ if ((t = av_dict_get(m, tag, NULL, AV_DICT_MATCH_CASE)) &&
+ strlen(t->value) == 4 && is_number(t->value))
+ return t;
+ return NULL;
+}
+
+static void merge_date(AVDictionary **m)
+{
+ AVDictionaryEntry *t;
+ char date[17] = {0}; // YYYY-MM-DD hh:mm
+
+ if (!(t = get_date_tag(*m, "TYER")) &&
+ !(t = get_date_tag(*m, "TYE")))
+ return;
+ av_strlcpy(date, t->value, 5);
+ av_dict_set(m, "TYER", NULL, 0);
+ av_dict_set(m, "TYE", NULL, 0);
+
+ if (!(t = get_date_tag(*m, "TDAT")) &&
+ !(t = get_date_tag(*m, "TDA")))
+ goto finish;
+ snprintf(date + 4, sizeof(date) - 4, "-%.2s-%.2s", t->value + 2, t->value);
+ av_dict_set(m, "TDAT", NULL, 0);
+ av_dict_set(m, "TDA", NULL, 0);
+
+ if (!(t = get_date_tag(*m, "TIME")) &&
+ !(t = get_date_tag(*m, "TIM")))
+ goto finish;
+ snprintf(date + 10, sizeof(date) - 10, " %.2s:%.2s", t->value, t->value + 2);
+ av_dict_set(m, "TIME", NULL, 0);
+ av_dict_set(m, "TIM", NULL, 0);
+
+finish:
+ if (date[0])
+ av_dict_set(m, "date", date, 0);
+}
+
+static void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
+{
+ int isv34, tlen, unsync;
+ char tag[5];
+ int64_t next, end = avio_tell(s->pb) + len;
+ int taghdrlen;
+ const char *reason = NULL;
+ AVIOContext pb;
+ unsigned char *buffer = NULL;
+ int buffer_size = 0;
+
+ 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;
+ }
+
+ unsync = flags & 0x80;
+
+ if (isv34 && flags & 0x40) /* Extended header present, just skip over it */
+ avio_skip(s->pb, get_size(s->pb, 4));
+
+ while (len >= taghdrlen) {
+ unsigned int tflags = 0;
+ int tunsync = 0;
+
+ if (isv34) {
+ avio_read(s->pb, tag, 4);
+ tag[4] = 0;
+ if(version==3){
+ tlen = avio_rb32(s->pb);
+ }else
+ tlen = get_size(s->pb, 4);
+ tflags = avio_rb16(s->pb);
+ tunsync = tflags & ID3v2_FLAG_UNSYNCH;
+ } else {
+ avio_read(s->pb, tag, 3);
+ tag[3] = 0;
+ tlen = avio_rb24(s->pb);
+ }
+ if (tlen <= 0 || tlen > len - taghdrlen) {
+ av_log(s, AV_LOG_WARNING, "Invalid size in frame %s, skipping the rest of tag.\n", tag);
+ break;
+ }
+ len -= taghdrlen + tlen;
+ next = avio_tell(s->pb) + tlen;
+
+ if (tflags & ID3v2_FLAG_DATALEN) {
+ avio_rb32(s->pb);
+ tlen -= 4;
+ }
+
+ if (tflags & (ID3v2_FLAG_ENCRYPTION | ID3v2_FLAG_COMPRESSION)) {
+ av_log(s, AV_LOG_WARNING, "Skipping encrypted/compressed ID3v2 frame %s.\n", tag);
+ avio_skip(s->pb, tlen);
+ } else if (tag[0] == 'T') {
+ if (unsync || tunsync) {
+ int i, j;
+ av_fast_malloc(&buffer, &buffer_size, tlen);
+ if (!buffer) {
+ av_log(s, AV_LOG_ERROR, "Failed to alloc %d bytes\n", tlen);
+ goto seek;
+ }
+ for (i = 0, j = 0; i < tlen; i++, j++) {
+ buffer[j] = avio_r8(s->pb);
+ if (j > 0 && !buffer[j] && buffer[j - 1] == 0xff) {
+ /* Unsynchronised byte, skip it */
+ j--;
+ }
+ }
+ ffio_init_context(&pb, buffer, j, 0, NULL, NULL, NULL, NULL);
+ read_ttag(s, &pb, j, tag);
+ } else {
+ read_ttag(s, s->pb, tlen, tag);
+ }
+ }
+ else if (!tag[0]) {
+ if (tag[1])
+ av_log(s, AV_LOG_WARNING, "invalid frame id, assuming padding");
+ avio_skip(s->pb, tlen);
+ break;
+ }
+ /* Skip to end of tag */
+seek:
+ avio_seek(s->pb, next, SEEK_SET);
+ }
+
+ if (version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
+ end += 10;
+
+ error:
+ if (reason)
+ av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
+ avio_seek(s->pb, end, SEEK_SET);
+ av_free(buffer);
+ return;
+}
+
+void ff_id3v2_read(AVFormatContext *s, const char *magic)
+{
+ int len, ret;
+ uint8_t buf[ID3v2_HEADER_SIZE];
+ int found_header;
+ int64_t off;
+
+ do {
+ /* save the current offset in case there's nothing to read/skip */
+ off = avio_tell(s->pb);
+ ret = avio_read(s->pb, buf, ID3v2_HEADER_SIZE);
+ if (ret != ID3v2_HEADER_SIZE)
+ break;
+ found_header = ff_id3v2_match(buf, magic);
+ if (found_header) {
+ /* parse ID3v2 header */
+ len = ((buf[6] & 0x7f) << 21) |
+ ((buf[7] & 0x7f) << 14) |
+ ((buf[8] & 0x7f) << 7) |
+ (buf[9] & 0x7f);
+ ff_id3v2_parse(s, len, buf[3], buf[5]);
+ } else {
+ avio_seek(s->pb, off, SEEK_SET);
+ }
+ } while (found_header);
+ ff_metadata_conv(&s->metadata, NULL, ff_id3v2_34_metadata_conv);
+ ff_metadata_conv(&s->metadata, NULL, ff_id3v2_2_metadata_conv);
+ ff_metadata_conv(&s->metadata, NULL, ff_id3v2_4_metadata_conv);
+ merge_date(&s->metadata);
+}
+
+const AVMetadataConv ff_id3v2_34_metadata_conv[] = {
+ { "TALB", "album"},
+ { "TCOM", "composer"},
+ { "TCON", "genre"},
+ { "TCOP", "copyright"},
+ { "TENC", "encoded_by"},
+ { "TIT2", "title"},
+ { "TLAN", "language"},
+ { "TPE1", "artist"},
+ { "TPE2", "album_artist"},
+ { "TPE3", "performer"},
+ { "TPOS", "disc"},
+ { "TPUB", "publisher"},
+ { "TRCK", "track"},
+ { "TSSE", "encoder"},
+ { 0 }
+};
+
+const AVMetadataConv ff_id3v2_4_metadata_conv[] = {
+ { "TDRL", "date"},
+ { "TDRC", "date"},
+ { "TDEN", "creation_time"},
+ { "TSOA", "album-sort"},
+ { "TSOP", "artist-sort"},
+ { "TSOT", "title-sort"},
+ { 0 }
+};
+
+const AVMetadataConv ff_id3v2_2_metadata_conv[] = {
+ { "TAL", "album"},
+ { "TCO", "genre"},
+ { "TT2", "title"},
+ { "TEN", "encoded_by"},
+ { "TP1", "artist"},
+ { "TP2", "album_artist"},
+ { "TP3", "performer"},
+ { "TRK", "track"},
+ { 0 }
+};
+
+
+const char ff_id3v2_tags[][4] = {
+ "TALB", "TBPM", "TCOM", "TCON", "TCOP", "TDLY", "TENC", "TEXT",
+ "TFLT", "TIT1", "TIT2", "TIT3", "TKEY", "TLAN", "TLEN", "TMED",
+ "TOAL", "TOFN", "TOLY", "TOPE", "TOWN", "TPE1", "TPE2", "TPE3",
+ "TPE4", "TPOS", "TPUB", "TRCK", "TRSN", "TRSO", "TSRC", "TSSE",
+ { 0 },
+};
+
+const char ff_id3v2_4_tags[][4] = {
+ "TDEN", "TDOR", "TDRC", "TDRL", "TDTG", "TIPL", "TMCL", "TMOO",
+ "TPRO", "TSOA", "TSOP", "TSOT", "TSST",
+ { 0 },
+};
+
+const char ff_id3v2_3_tags[][4] = {
+ "TDAT", "TIME", "TORY", "TRDA", "TSIZ", "TYER",
+ { 0 },
+};