Revert "lavf/id3v2dec: support multiple values and TIPL frames"

see: Re: [FFmpeg-devel] [PATCH 2/2] avformat/id3v2: Check that decode_str() did advance

but in short, first our API since 16years says we dont have multiple values per key
(which it supports since 9 years only)

and it causes some problems for ffprobe apparently.
I do believe the original patch is the correct direction but it requires
more changes. So revert this until other things are in place and until
we have a consensus.

This reverts commit 80b77e8e8d0630710ad6069133f397459015f139.

1 files changed, 21 insertions, 28 deletions

diff --git a/libavformat/id3v2.c b/libavformat/id3v2.c
index 90314583a7..0441824126 100644
--- a/libavformat/id3v2.c
+++ b/libavformat/id3v2.c
@@ -327,12 +327,8 @@ static void read_ttag(AVFormatContext *s, AVIOContext *pb, int taglen,
                       AVDictionary **metadata, const char *key)
 {
     uint8_t *dst;
-    uint8_t *dst_key = NULL;
-    int encoding, dict_flags = AV_DICT_MULTIKEY | AV_DICT_DONT_STRDUP_VAL | AV_DICT_DEDUP;
+    int encoding, dict_flags = AV_DICT_DONT_OVERWRITE | AV_DICT_DONT_STRDUP_VAL;
     unsigned genre;
-    int count = 0;
-    int is_tipl = !(strcmp(key, "TIPL") && strcmp(key, "TMCL") &&
-                    strcmp(key, "IPL"));
 
     if (taglen < 1)
         return;
@@ -340,33 +336,30 @@ static void read_ttag(AVFormatContext *s, AVIOContext *pb, int taglen,
     encoding = avio_r8(pb);
     taglen--; /* account for encoding type byte */
 
-    while (taglen > 1) {
+    if (decode_str(s, pb, encoding, &dst, &taglen) < 0) {
+        av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", key);
+        return;
+    }
+
+    if (!(strcmp(key, "TCON") && strcmp(key, "TCO"))                         &&
+        (sscanf(dst, "(%d)", &genre) == 1 || sscanf(dst, "%d", &genre) == 1) &&
+        genre <= ID3v1_GENRE_MAX) {
+        av_freep(&dst);
+        dst = av_strdup(ff_id3v1_genre_str[genre]);
+    } else if (!(strcmp(key, "TXXX") && strcmp(key, "TXX"))) {
+        /* dst now contains the key, need to get value */
+        key = dst;
         if (decode_str(s, pb, encoding, &dst, &taglen) < 0) {
             av_log(s, AV_LOG_ERROR, "Error reading frame %s, skipped\n", key);
+            av_freep(&key);
             return;
         }
+        dict_flags |= AV_DICT_DONT_STRDUP_KEY;
+    } else if (!*dst)
+        av_freep(&dst);
 
-        count++;
-
-        if (!(strcmp(key, "TCON") && strcmp(key, "TCO"))                         &&
-            (sscanf(dst, "(%d)", &genre) == 1 || sscanf(dst, "%d", &genre) == 1) &&
-            genre <= ID3v1_GENRE_MAX) {
-            av_freep(&dst);
-            dst = av_strdup(ff_id3v1_genre_str[genre]);
-        } else if (!(strcmp(key, "TXXX") && strcmp(key, "TXX")) ||
-                   (is_tipl && (count & 1))) {
-            /* dst now contains the key, need to get value */
-            av_free(dst_key);
-            key = dst_key = dst;
-            continue;
-        } else if (!*dst)
-            av_freep(&dst);
-
-        if (dst)
-            av_dict_set(metadata, key, dst, dict_flags);
-    }
-
-    av_free(dst_key);
+    if (dst)
+        av_dict_set(metadata, key, dst, dict_flags);
 }
 
 static void read_uslt(AVFormatContext *s, AVIOContext *pb, int taglen,
@@ -1051,7 +1044,7 @@ static void id3v2_parse(AVIOContext *pb, AVDictionary **metadata,
                     pbx = &pb_local.pub; // read from sync buffer
                 }
 #endif
-            if (tag[0] == 'T' || !strcmp(tag, "IPL"))
+            if (tag[0] == 'T')
                 /* parse text tag */
                 read_ttag(s, pbx, tlen, metadata, tag);
             else if (!memcmp(tag, "USLT", 4))