[FFmpeg-devel] [PATCH v2] Add SUP/PGS subtitle muxer

phintuka at gmail.com phintuka at gmail.com
Tue Sep 30 10:01:17 CEST 2014


From: Petri Hintukainen <phintuka at users.sourceforge.net>

Fixes ticket #2208
---
 Changelog                |  2 +-
 doc/general.texi         |  2 +-
 libavformat/Makefile     |  1 +
 libavformat/allformats.c |  2 +-
 libavformat/supenc.c     | 96 ++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 100 insertions(+), 3 deletions(-)
 create mode 100644 libavformat/supenc.c

diff --git a/Changelog b/Changelog
index 039d1ca..f171c17 100644
--- a/Changelog
+++ b/Changelog
@@ -3,7 +3,7 @@ releases are sorted from youngest to oldest.
 
 version <next>:
 - HEVC/H.265 RTP payload format (draft v6) packetizer
-- SUP/PGS subtitle demuxer
+- SUP/PGS subtitle demuxer and muxer
 
 version 2.4:
 - Icecast protocol
diff --git a/doc/general.texi b/doc/general.texi
index 2252f7b..b848e7e 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -454,7 +454,7 @@ library:
 @item Sony Wave64 (W64)         @tab X @tab X
 @item SoX native format         @tab X @tab X
 @item SUN AU format             @tab X @tab X
- at item SUP raw PGS subtitles     @tab   @tab X
+ at item SUP raw PGS subtitles     @tab X @tab X
 @item Text files                @tab   @tab X
 @item THP                       @tab   @tab X
     @tab Used on the Nintendo GameCube.
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 86064ea..7385b67 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -407,6 +407,7 @@ OBJS-$(CONFIG_SRT_MUXER)                 += srtenc.o
 OBJS-$(CONFIG_STR_DEMUXER)               += psxstr.o
 OBJS-$(CONFIG_SUBVIEWER1_DEMUXER)        += subviewer1dec.o subtitles.o
 OBJS-$(CONFIG_SUBVIEWER_DEMUXER)         += subviewerdec.o subtitles.o
+OBJS-$(CONFIG_SUP_MUXER)                 += supenc.o
 OBJS-$(CONFIG_SUP_DEMUXER)               += supdec.o
 OBJS-$(CONFIG_SWF_DEMUXER)               += swfdec.o swf.o
 OBJS-$(CONFIG_SWF_MUXER)                 += swfenc.o swf.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index d54ed9b..0b64355 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -280,7 +280,7 @@ void av_register_all(void)
     REGISTER_DEMUXER (STR,              str);
     REGISTER_DEMUXER (SUBVIEWER1,       subviewer1);
     REGISTER_DEMUXER (SUBVIEWER,        subviewer);
-    REGISTER_DEMUXER (SUP,              sup);
+    REGISTER_MUXDEMUX(SUP,              sup);
     REGISTER_MUXDEMUX(SWF,              swf);
     REGISTER_DEMUXER (TAK,              tak);
     REGISTER_MUXER   (TEE,              tee);
diff --git a/libavformat/supenc.c b/libavformat/supenc.c
new file mode 100644
index 0000000..f5f6b58
--- /dev/null
+++ b/libavformat/supenc.c
@@ -0,0 +1,96 @@
+/*
+ * SUP muxer
+ * Copyright (c) 2014 Petri Hintukainen <phintuka at users.sourceforge.net>
+ *
+ * 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 "avformat.h"
+#include "internal.h"
+#include "libavutil/intreadwrite.h"
+
+#define SUP_PGS_MAGIC 0x5047 /* "PG", big endian */
+
+static int sup_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    uint8_t *data = pkt->data;
+    size_t size = pkt->size;
+    uint32_t pts = 0, dts = 0;
+
+    if (pkt->pts != AV_NOPTS_VALUE) {
+        pts = (uint32_t)pkt->pts;
+    }
+    if (pkt->dts != AV_NOPTS_VALUE) {
+        dts = (uint32_t)pkt->dts;
+    }
+
+    /*
+      Split frame to segments.
+      mkvmerge stores multiple segments in one frame.
+    */
+    while (size > 2) {
+        size_t len = AV_RB16(data + 1) + 3;
+
+        if (len > size) {
+            av_log(s, AV_LOG_ERROR, "Not enough data, skipping %d bytes\n",
+                     (int)size);
+            return AVERROR_INVALIDDATA;
+        }
+
+        /* header */
+        avio_wb16(s->pb, SUP_PGS_MAGIC);
+        avio_wb32(s->pb, pts);
+        avio_wb32(s->pb, dts);
+
+        avio_write(s->pb, data, len);
+
+        data += len;
+        size -= len;
+    }
+
+    if (size > 0) {
+        av_log(s, AV_LOG_ERROR, "Skipping %d bytes after last segment in frame\n",
+                 (int)size);
+        return AVERROR_INVALIDDATA;
+    }
+
+    return 0;
+}
+
+static int sup_write_header(AVFormatContext *s)
+{
+    if (s->nb_streams != 1) {
+        av_log(s, AV_LOG_ERROR, "%s files have exactly one stream\n",
+               s->oformat->name);
+        return AVERROR(EINVAL);
+    }
+
+    avpriv_set_pts_info(s->streams[0], 32, 1, 90000);
+
+    return 0;
+}
+
+AVOutputFormat ff_sup_muxer = {
+    .name           = "sup",
+    .long_name      = NULL_IF_CONFIG_SMALL("raw HDMV Presentation Graphic Stream subtitles"),
+    .extensions     = "sup",
+    .mime_type      = "application/x-pgs",
+    .subtitle_codec = AV_CODEC_ID_HDMV_PGS_SUBTITLE,
+    .write_header   = sup_write_header,
+    .write_packet   = sup_write_packet,
+    .flags          = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT,
+};
-- 
1.9.1



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