+
+static void get_string(AVFormatContext *s, const char *key,
+ const uint8_t *buf, int buf_size)
+{
+ int i, c;
+ char *q, str[512];
+
+ q = str;
+ for(i = 0; i < buf_size; i++) {
+ c = buf[i];
+ if (c == '\0')
+ break;
+ if ((q - str) >= sizeof(str) - 1)
+ break;
+ *q++ = c;
+ }
+ *q = '\0';
+
+ if (*str)
+ av_dict_set(&s->metadata, key, str, 0);
+}
+
+/**
+ * Parse an ID3v1 tag
+ *
+ * @param buf ID3v1_TAG_SIZE long buffer containing the tag
+ */
+static int parse_tag(AVFormatContext *s, const uint8_t *buf)
+{
+ char str[5];
+ int genre;
+
+ if (!(buf[0] == 'T' &&
+ buf[1] == 'A' &&
+ buf[2] == 'G'))
+ return -1;
+ get_string(s, "title", buf + 3, 30);
+ get_string(s, "artist", buf + 33, 30);
+ get_string(s, "album", buf + 63, 30);
+ get_string(s, "date", buf + 93, 4);
+ get_string(s, "comment", buf + 97, 30);
+ if (buf[125] == 0 && buf[126] != 0) {
+ snprintf(str, sizeof(str), "%d", buf[126]);
+ av_dict_set(&s->metadata, "track", str, 0);
+ }
+ genre = buf[127];
+ if (genre <= ID3v1_GENRE_MAX)
+ av_dict_set(&s->metadata, "genre", ff_id3v1_genre_str[genre], 0);
+ return 0;
+}
+
+void ff_id3v1_read(AVFormatContext *s)
+{
+ int ret;
+ uint8_t buf[ID3v1_TAG_SIZE];
+ int64_t filesize, position = avio_tell(s->pb);
+
+ if (s->pb->seekable) {
+ /* XXX: change that */
+ filesize = avio_size(s->pb);
+ if (filesize > 128) {
+ avio_seek(s->pb, filesize - 128, SEEK_SET);
+ ret = avio_read(s->pb, buf, ID3v1_TAG_SIZE);
+ if (ret == ID3v1_TAG_SIZE) {
+ parse_tag(s, buf);
+ }
+ avio_seek(s->pb, position, SEEK_SET);
+ }
+ }
+}