basic type mechanism working

1 files changed, 12 insertions, 1 deletions

diff --git a/ffmpeg/libavformat/dfa.c b/ffmpeg/libavformat/dfa.c
index 8cf2f24..9cd13e2 100644
--- a/ffmpeg/libavformat/dfa.c
+++ b/ffmpeg/libavformat/dfa.c
@@ -28,6 +28,9 @@ static int dfa_probe(AVProbeData *p)
     if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A'))
         return 0;
 
+    if (AV_RL32(p->buf + 16) != 0x80)
+        return AVPROBE_SCORE_MAX / 4;
+
     return AVPROBE_SCORE_MAX;
 }
 
@@ -36,13 +39,15 @@ static int dfa_read_header(AVFormatContext *s)
     AVIOContext *pb = s->pb;
     AVStream *st;
     int frames;
+    int version;
     uint32_t mspf;
 
     if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) {
         av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n");
         return AVERROR_INVALIDDATA;
     }
-    avio_skip(pb, 2); // unused
+
+    version = avio_rl16(pb);
     frames = avio_rl16(pb);
 
     st = avformat_new_stream(s, NULL);
@@ -62,6 +67,12 @@ static int dfa_read_header(AVFormatContext *s)
     avio_skip(pb, 128 - 16); // padding
     st->duration = frames;
 
+    if (ff_alloc_extradata(st->codec, 2))
+        return AVERROR(ENOMEM);
+    AV_WL16(st->codec->extradata, version);
+    if (version == 0x100)
+        st->sample_aspect_ratio = (AVRational){2, 1};
+
     return 0;
 }