Add VorbisComment writing to FLAC files.

Patch by James Darnley <james darnley at gmail>.

Originally committed as revision 22605 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 73 insertions, 0 deletions

diff --git a/libavformat/vorbiscomment.c b/libavformat/vorbiscomment.c
new file mode 100644
index 0000000000..d23c66d7f0
--- /dev/null
+++ b/libavformat/vorbiscomment.c
@@ -0,0 +1,73 @@
+/*
+ * VorbisComment writer
+ * Copyright (c) 2009 James Darnley
+ *
+ * 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 "metadata.h"
+#include "vorbiscomment.h"
+#include "libavcodec/bytestream.h"
+
+/**
+ * VorbisComment metadata conversion mapping.
+ * from Ogg Vorbis I format specification: comment field and header specification
+ * http://xiph.org/vorbis/doc/v-comment.html
+ */
+const AVMetadataConv ff_vorbiscomment_metadata_conv[] = {
+    { "ALBUMARTIST", "album_artist"},
+    { "TRACKNUMBER", "track"  },
+    { 0 }
+};
+
+int ff_vorbiscomment_length(AVMetadata *m, const char *vendor_string,
+                            unsigned *count)
+{
+    int len = 8;
+    len += strlen(vendor_string);
+    *count = 0;
+    if (m) {
+        AVMetadataTag *tag = NULL;
+        while ( (tag = av_metadata_get(m, "", tag, AV_METADATA_IGNORE_SUFFIX) ) ) {
+            len += 4 +strlen(tag->key) + 1 + strlen(tag->value);
+            (*count)++;
+        }
+    }
+    return len;
+}
+
+int ff_vorbiscomment_write(uint8_t **p, AVMetadata *m,
+                           const char *vendor_string, const unsigned count)
+{
+    bytestream_put_le32(p, strlen(vendor_string));
+    bytestream_put_buffer(p, vendor_string, strlen(vendor_string));
+    if (m) {
+        AVMetadataTag *tag = NULL;
+        bytestream_put_le32(p, count);
+        while ( (tag = av_metadata_get(m, "", tag, AV_METADATA_IGNORE_SUFFIX) ) ) {
+            unsigned int len1 = strlen(tag->key);
+            unsigned int len2 = strlen(tag->value);
+            bytestream_put_le32(p, len1+1+len2);
+            bytestream_put_buffer(p, tag->key, len1);
+            bytestream_put_byte(p, '=');
+            bytestream_put_buffer(p, tag->value, len2);
+        }
+    } else
+        bytestream_put_le32(p, 0);
+    return 0;
+}