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>

libavformat/Makefile

@@ -274,6 +274,7 @@ OBJS-$(CONFIG_MD5_MUXER)                 += hashenc.o
 OBJS-$(CONFIG_MGSTS_DEMUXER)             += mgsts.o
 OBJS-$(CONFIG_MICRODVD_DEMUXER)          += microdvddec.o subtitles.o
 OBJS-$(CONFIG_MICRODVD_MUXER)            += microdvdenc.o
+OBJS-$(CONFIG_MJPEG_2000_DEMUXER)        += rawdec.o mj2kdec.o
 OBJS-$(CONFIG_MJPEG_DEMUXER)             += rawdec.o
 OBJS-$(CONFIG_MJPEG_MUXER)               += rawenc.o
 OBJS-$(CONFIG_MLP_DEMUXER)               += rawdec.o mlpdec.o

libavformat/allformats.c

@@ -183,6 +183,7 @@ void av_register_all(void)
     REGISTER_DEMUXER (MGSTS,            mgsts);
     REGISTER_MUXDEMUX(MICRODVD,         microdvd);
     REGISTER_MUXDEMUX(MJPEG,            mjpeg);
+    REGISTER_DEMUXER (MJPEG_2000,       mjpeg_2000);
     REGISTER_MUXDEMUX(MLP,              mlp);
     REGISTER_DEMUXER (MLV,              mlv);
     REGISTER_DEMUXER (MM,               mm);

libavformat/mj2kdec.c

+/*
+ * 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

libavformat/utils.c

@@ -328,6 +328,7 @@ static int set_codec_from_probe_data(AVFormatContext *s, AVStream *st,
         { "hevc",      AV_CODEC_ID_HEVC,       AVMEDIA_TYPE_VIDEO },
         { "loas",      AV_CODEC_ID_AAC_LATM,   AVMEDIA_TYPE_AUDIO },
         { "m4v",       AV_CODEC_ID_MPEG4,      AVMEDIA_TYPE_VIDEO },
+        { "mjpeg_2000",AV_CODEC_ID_JPEG2000,   AVMEDIA_TYPE_VIDEO },
         { "mp3",       AV_CODEC_ID_MP3,        AVMEDIA_TYPE_AUDIO },
         { "mpegvideo", AV_CODEC_ID_MPEG2VIDEO, AVMEDIA_TYPE_VIDEO },
         { "truehd",    AV_CODEC_ID_TRUEHD,     AVMEDIA_TYPE_AUDIO },

libavformat/version.h

@@ -32,7 +32,7 @@
 // Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
 // Also please add any ticket numbers that you believe might be affected here
 #define LIBAVFORMAT_VERSION_MAJOR  57
-#define LIBAVFORMAT_VERSION_MINOR  60
+#define LIBAVFORMAT_VERSION_MINOR  61
 #define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \