Add SUP/PGS subtitle muxer

Fixes ticket #2208

1 files changed, 96 insertions, 0 deletions

diff --git a/libavformat/supenc.c b/libavformat/supenc.c
new file mode 100644
index 0000000000..f5f6b58c87
--- /dev/null
+++ b/libavformat/supenc.c
@@ -0,0 +1,96 @@
+/*
+ * SUP muxer
+ * Copyright (c) 2014 Petri Hintukainen <phintuka@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,
+};