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, 57 insertions, 0 deletions

diff --git a/libavformat/vorbiscomment.h b/libavformat/vorbiscomment.h
new file mode 100644
index 0000000000..714f1f2b96
--- /dev/null
+++ b/libavformat/vorbiscomment.h
@@ -0,0 +1,57 @@
+/*
+ * 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
+ */
+
+#ifndef AVFORMAT_VORBISCOMMENT_H
+#define AVFORMAT_VORBISCOMMENT_H
+
+#include "avformat.h"
+#include "metadata.h"
+
+/**
+ * Calculates the length in bytes of a VorbisComment. This is the minimum
+ * size required by ff_vorbiscomment_write().
+ *
+ * @param m The metadata structure to be parsed. For no metadata, set to NULL.
+ * @param vendor_string The vendor string to be added into the VorbisComment.
+ * For no string, set to an empty string.
+ * @param count Pointer to store the number of tags in m because m->count is "not allowed"
+ * @return The length in bytes.
+ */
+int ff_vorbiscomment_length(AVMetadata *m, const char *vendor_string,
+                            unsigned *count);
+
+/**
+ * Writes a VorbisComment into a buffer. The buffer, p, must have enough
+ * data to hold the whole VorbisComment. The minimum size required can be
+ * obtained by passing the same AVMetadata and vendor_string to
+ * ff_vorbiscomment_length()
+ *
+ * @param p The buffer in which to write.
+ * @param m The metadata struct to write.
+ * @param vendor_string The vendor string to write.
+ * @param count The number of tags in m because m->count is "not allowed"
+ */
+int ff_vorbiscomment_write(uint8_t **p, AVMetadata *m,
+                           const char *vendor_string, const unsigned count);
+
+extern const AVMetadataConv ff_vorbiscomment_metadata_conv[];
+
+#endif /* AVFORMAT_VORBISCOMMENT_H */