add a metadata conversion API

Originally committed as revision 17670 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 16 insertions, 2 deletions

diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index cc20fbb884..94764f3875 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -46,6 +46,8 @@ unsigned avformat_version(void);
 
 #include "avio.h"
 
+struct AVFormatContext;
+
 
 /*
  * Public Metadata API.
@@ -77,6 +79,7 @@ typedef struct {
 }AVMetadataTag;
 
 typedef struct AVMetadata AVMetadata;
+typedef struct AVMetadataConv AVMetadataConv;
 
 /**
  * Gets a metadata element with matching key.
@@ -96,6 +99,15 @@ av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int f
 int av_metadata_set(AVMetadata **pm, const char *key, const char *value);
 
 /**
+ * Convert all the metadata sets from ctx according to the source and
+ * destination conversion tables.
+ * @param d_conv destination tags format conversion table
+ * @param s_conv source tags format conversion table
+ */
+void av_metadata_conv(struct AVFormatContext *ctx,const AVMetadataConv *d_conv,
+                                                  const AVMetadataConv *s_conv);
+
+/**
  * Frees all the memory allocated for an AVMetadata struct.
  */
 void av_metadata_free(AVMetadata **m);
@@ -220,8 +232,6 @@ typedef struct AVFrac {
 
 struct AVCodecTag;
 
-struct AVFormatContext;
-
 /** This structure contains the data a format has to probe a file. */
 typedef struct AVProbeData {
     const char *filename;
@@ -299,6 +309,8 @@ typedef struct AVOutputFormat {
 
     enum CodecID subtitle_codec; /**< default subtitle codec */
 
+    AVMetadataConv *metadata_conv;
+
     /* private fields */
     struct AVOutputFormat *next;
 } AVOutputFormat;
@@ -378,6 +390,8 @@ typedef struct AVInputFormat {
      */
     int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
 
+    AVMetadataConv *metadata_conv;
+
     /* private fields */
     struct AVInputFormat *next;
 } AVInputFormat;