apetag: add proper support for binary tags

export as attachment streams
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>

libavformat/apetag.c

@@ -29,16 +29,17 @@
 #define APE_TAG_FOOTER_BYTES          32
 #define APE_TAG_FLAG_CONTAINS_HEADER  (1 << 31)
 #define APE_TAG_FLAG_IS_HEADER        (1 << 29)
+#define APE_TAG_FLAG_IS_BINARY        (1 << 1)
 
 static int ape_tag_read_field(AVFormatContext *s)
 {
     AVIOContext *pb = s->pb;
     uint8_t key[1024], *value;
-    uint32_t size;
+    uint32_t size, flags;
     int i, c;
 
     size = avio_rl32(pb);  /* field size */
-    avio_skip(pb, 4);      /* field flags */
+    flags = avio_rl32(pb); /* field flags */
     for (i = 0; i < sizeof(key) - 1; i++) {
         c = avio_r8(pb);
         if (c < 0x20 || c > 0x7E)
@@ -53,12 +54,30 @@ static int ape_tag_read_field(AVFormatContext *s)
     }
     if (size >= UINT_MAX)
         return -1;
-    value = av_malloc(size+1);
-    if (!value)
-        return AVERROR(ENOMEM);
-    avio_read(pb, value, size);
-    value[size] = 0;
-    av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
+    if (flags & APE_TAG_FLAG_IS_BINARY) {
+        uint8_t filename[1024];
+        AVStream *st = avformat_new_stream(s, NULL);
+        if (!st)
+            return AVERROR(ENOMEM);
+        avio_get_str(pb, INT_MAX, filename, sizeof(filename));
+        st->codec->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
+        if (!st->codec->extradata)
+            return AVERROR(ENOMEM);
+        if (avio_read(pb, st->codec->extradata, size) != size) {
+            av_freep(&st->codec->extradata);
+            return AVERROR(EIO);
+        }
+        st->codec->extradata_size = size;
+        av_dict_set(&st->metadata, key, filename, 0);
+        st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
+    } else {
+        value = av_malloc(size+1);
+        if (!value)
+            return AVERROR(ENOMEM);
+        c = avio_read(pb, value, size);
+        value[c] = 0;
+        av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
+    }
     return 0;
 }