ffmdec: set avio buffer to ffm->packet_size, avoid dirty reads

8ba987bf · Yan Jing · Michael Niedermayer · 0b99e858 · 8ba987bf
Commit 8ba987bf authored Sep 08, 2011 by Yan Jing Committed by Michael Niedermayer Sep 08, 2011
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ffmdec.c libavformat/ffmdec.c +5 -0

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--- a/libavformat/ffmdec.c
+++ b/libavformat/ffmdec.c
@@ -121,6 +121,11 @@ static int ffm_read_data(AVFormatContext *s,
            if (avio_tell(pb) == ffm->file_size)
                avio_seek(pb, ffm->packet_size, SEEK_SET);
    retry_read:
+            if (pb->buffer_size != ffm->packet_size) {
+                int64_t tell = avio_tell(pb);
+                url_setbufsize(pb, ffm->packet_size);
+                avio_seek(pb, tell, SEEK_SET);
+            }
            id = avio_rb16(pb); /* PACKET_ID */
            if (id != PACKET_ID)
                if (ffm_resync(s, id) < 0)