avformat: Auto-detect mjpeg 2000 in mpeg-ts

This makes it possible to decode motion jpeg 2000
encoded in a transport stream without a correct PMT/PAT.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

1 files changed, 54 insertions, 0 deletions

diff --git a/libavformat/mj2kdec.c b/libavformat/mj2kdec.c
new file mode 100644
index 0000000000..1fb94094cc
--- /dev/null
+++ b/libavformat/mj2kdec.c
@@ -0,0 +1,54 @@
+/*
+ * MJPEG 2000 Demuxer
+ * Copyright (c) 2016 Ståle Kristoffersen
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "rawdec.h"
+
+#if CONFIG_MJPEG_2000_DEMUXER
+static int mjpeg2000_probe(AVProbeData *p)
+{
+    const uint8_t *b = p->buf;
+    int i, marker, marker_size;
+    int frames = 0, invalid = 0;
+
+    for (i = 0; i < p->buf_size - 5; i++) {
+        if (AV_RB32(b) == 0xff4fff51){
+            marker_size = AV_RB16(b+4);
+            if (marker_size + i < p->buf_size - 4) {
+                marker = AV_RB8(b+4+marker_size);
+                if (marker == 0xff)
+                    frames++;
+                else
+                    invalid++;
+            }
+        }
+        b += 1;
+    }
+    if (invalid*4 + 1 < frames) {
+        if (invalid == 0 && frames > 2)
+            return AVPROBE_SCORE_EXTENSION / 2;
+        return AVPROBE_SCORE_EXTENSION / 4;
+    }
+    return 0;
+}
+FF_DEF_RAWVIDEO_DEMUXER2(mjpeg_2000, "raw MJPEG 2000 video", mjpeg2000_probe, "j2k", AV_CODEC_ID_JPEG2000, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)
+#endif