Metadata muxer

Dumps all metadata to a text file for easy manual editing.

Originally committed as revision 26101 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 100 insertions, 0 deletions

diff --git a/libavformat/metaenc.c b/libavformat/metaenc.c
new file mode 100644
index 0000000000..65ab363a1b
--- /dev/null
+++ b/libavformat/metaenc.c
@@ -0,0 +1,100 @@
+/*
+ * Metadata muxer
+ * Copyright (c) 2010 Anton Khirnov
+ *
+ * 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 "meta.h"
+
+
+static void write_escape_str(ByteIOContext *s, const uint8_t *str)
+{
+    const uint8_t *p = str;
+
+    while (*p) {
+        if (*p == '#' || *p == ';' || *p == '=' || *p == '\\' || *p == '\n')
+            put_byte(s, '\\');
+        put_byte(s, *p);
+        p++;
+    }
+}
+
+static void write_tags(ByteIOContext *s, AVMetadata *m)
+{
+    AVMetadataTag *t = NULL;
+    while ((t = av_metadata_get(m, "", t, AV_METADATA_IGNORE_SUFFIX))) {
+        write_escape_str(s, t->key);
+        put_byte(s, '=');
+        write_escape_str(s, t->value);
+        put_byte(s, '\n');
+    }
+}
+
+static int write_header(AVFormatContext *s)
+{
+    put_tag(s->pb, ID_STRING);
+    put_byte(s->pb, '1');          // version
+    put_byte(s->pb, '\n');
+    put_flush_packet(s->pb);
+    return 0;
+}
+
+static int write_trailer(AVFormatContext *s)
+{
+    int i;
+
+    write_tags(s->pb, s->metadata);
+
+    for (i = 0; i < s->nb_streams; i++) {
+        put_tag(s->pb, ID_STREAM);
+        put_byte(s->pb, '\n');
+        write_tags(s->pb, s->streams[i]->metadata);
+    }
+
+    for (i = 0; i < s->nb_chapters; i++) {
+        AVChapter *ch = s->chapters[i];
+        put_tag(s->pb, ID_CHAPTER);
+        put_byte(s->pb, '\n');
+        url_fprintf(s->pb, "TIMEBASE=%d/%d\n", ch->time_base.num, ch->time_base.den);
+        url_fprintf(s->pb, "START=%lld\n", ch->start);
+        url_fprintf(s->pb, "END=%lld\n",   ch->end);
+        write_tags(s->pb, ch->metadata);
+    }
+
+    put_flush_packet(s->pb);
+
+    return 0;
+}
+
+static int write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    return 0;
+}
+
+AVOutputFormat ffmetadata_muxer = {
+    .name          = "ffmetadata",
+    .long_name     = NULL_IF_CONFIG_SMALL("FFmpeg metadata in text format"),
+    .extensions    = "ffmeta",
+    .video_codec   = CODEC_ID_NONE,
+    .audio_codec   = CODEC_ID_NONE,
+    .write_header  = write_header,
+    .write_packet  = write_packet,
+    .write_trailer = write_trailer,
+    .flags         = AVFMT_NOTIMESTAMPS | AVFMT_NOSTREAMS,
+};