Merge remote-tracking branch 'cehoyos/master'

* cehoyos/master:
  lavc/qdrw: Do not fail decoding valid Quickdraw images.
  lavf/mov: Use AVCOL_SPC constants when checking color_space.
  lavf/mov: Write colour matrix "6" for color_space bt470bg.
  lavf/mkv: Only skip prores header if the packet is large enough.

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/qdrw.c

@@ -153,7 +153,6 @@ static int decode_frame(AVCodecContext *avctx,
 
     bytestream2_init(&gbc, avpkt->data, avpkt->size);
     if (   bytestream2_get_bytes_left(&gbc) >= 552
-           && !check_header(gbc.buffer      , bytestream2_get_bytes_left(&gbc))
            &&  check_header(gbc.buffer + 512, bytestream2_get_bytes_left(&gbc) - 512)
        )
         bytestream2_skip(&gbc, 512);

libavformat/matroskaenc.c

@@ -1575,7 +1575,7 @@ static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
     } else
         data = pkt->data;
 
-    if (codec->codec_id == AV_CODEC_ID_PRORES) {
+    if (codec->codec_id == AV_CODEC_ID_PRORES && size >= 8) {
         /* Matroska specification requires to remove the first QuickTime atom
          */
         size  -= 8;

libavformat/movenc.c

@@ -1607,9 +1607,10 @@ static int mov_write_colr_tag(AVIOContext *pb, MOVTrack *track)
     default:                  avio_wb16(pb, 2);
     }
     switch (track->enc->colorspace) {
-    case AVCOL_TRC_BT709:     avio_wb16(pb, 1); break;
+    case AVCOL_SPC_BT709:     avio_wb16(pb, 1); break;
-    case AVCOL_PRI_SMPTE170M: avio_wb16(pb, 6); break;
+    case AVCOL_SPC_BT470BG:
-    case AVCOL_PRI_SMPTE240M: avio_wb16(pb, 7); break;
+    case AVCOL_SPC_SMPTE170M: avio_wb16(pb, 6); break;
+    case AVCOL_SPC_SMPTE240M: avio_wb16(pb, 7); break;
     default:                  avio_wb16(pb, 2);
     }