Hi,
I have some transport streams with only one pid, containing MJPEG 2000
video. Since the PMT/PAT is missing ffmpeg is unable to decode it.
The attached patch makes ffmpeg able to guess that it does contain a
stream of jpeg 2000, but I am not sure if this is the correct approach.
Also, should LIBAVFORMAT_VERSION_MICRO and the Changelog be updated?
--
Ståle Kristoffersen
>From 0d5594d4dfd1a9608ef55e90fb6a770b0f54cdaa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A5le=20Kristoffersen?= <staal...@ifi.uio.no>
Date: Tue, 11 Oct 2016 15:36:40 +0200
Subject: [PATCH] libavf: Auto-detect mjpeg 2000 in mpeg-ts
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This makes it possible to decode motion jpeg 2000
encoded in a transport stream without a correct PMT/PAT.
Signed-off-by: Ståle Kristoffersen <staal...@ifi.uio.no>
---
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/mj2kdec.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++
libavformat/utils.c | 1 +
4 files changed, 65 insertions(+)
create mode 100644 libavformat/mj2kdec.c
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 5d827d31..4020b8d 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -273,6 +273,7 @@ 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
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 6a216ef..7db6c52 100644
--- a/libavformat/allformats.c
+++ b/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);
diff --git a/libavformat/mj2kdec.c b/libavformat/mj2kdec.c
new file mode 100644
index 0000000..cf9e575
--- /dev/null
+++ b/libavformat/mj2kdec.c
@@ -0,0 +1,62 @@
+/*
+ * VC-1 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"
+#include "libavcodec/jpeg2000.h"
+
+
+#if CONFIG_MJPEG_2000_DEMUXER
+static int mjpeg2000_probe(AVProbeData *p)
+{
+ int i;
+ int invalid = 0;
+ int frames = 0;
+ uint16_t soc, marker, marker_size;
+ uint8_t marker_marker;
+
+ for (i=0; i<p->buf_size-5; i++) {
+ soc = AV_RB16(p->buf + i);
+ if (soc == JPEG2000_SOC ) {
+ marker = AV_RB16(p->buf + i + 2);
+ marker_size = AV_RB16(p->buf + i + 4);
+ if (marker == JPEG2000_SIZ) {
+ i += marker_size + 2;
+ marker_marker = AV_RB8(p->buf + i + 2);
+ if (marker_marker == 0xFF) {
+ frames++;
+ } else {
+ invalid++;
+ }
+ }
+ }
+ }
+
+ if (invalid*4 + 1 < frames) {
+ return 1;
+ }
+
+ 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
+
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 8a51aea..9e9a052 100644
--- a/libavformat/utils.c
+++ b/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 },
--
2.1.4
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