diff --git a/doc/APIchanges b/doc/APIchanges
index 16c14750d9..7d720258c3 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -15,6 +15,10 @@ libavutil:     2012-10-22
 
 API changes, most recent first:
 
+
+2013-05-24 - xxxxxxx - lavc 55.7.0 - avcodec.h
+  Add picture_structure to AVCodecParserContext.
+
 2013-05-17 - xxxxxxx - lavu 52.33.100 - opt.h
   Add AV_OPT_TYPE_COLOR value to AVOptionType enum.
 
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 7ce9df427a..93d63e8873 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -3788,6 +3788,13 @@ int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
  * @{
  */
 
+enum AVPictureStructure {
+    AV_PICTURE_STRUCTURE_UNKNOWN,      //< unknown
+    AV_PICTURE_STRUCTURE_TOP_FIELD,    //< coded as top field
+    AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
+    AV_PICTURE_STRUCTURE_FRAME,        //< coded as frame
+};
+
 typedef struct AVCodecParserContext {
     void *priv_data;
     struct AVCodecParser *parser;
@@ -3924,6 +3931,16 @@ typedef struct AVCodecParserContext {
     int duration;
 
     enum AVFieldOrder field_order;
+
+    /**
+     * Indicate whether a picture is coded as a frame, top field or bottom field.
+     *
+     * For example, H.264 field_pic_flag equal to 0 corresponds to
+     * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
+     * equal to 1 and bottom_field_flag equal to 0 corresponds to
+     * AV_PICTURE_STRUCTURE_TOP_FIELD.
+     */
+    enum AVPictureStructure picture_structure;
 } AVCodecParserContext;
 
 typedef struct AVCodecParser {
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 7d34f8a6cb..44c9f927ce 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -29,7 +29,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 55
-#define LIBAVCODEC_VERSION_MINOR  11
+#define LIBAVCODEC_VERSION_MINOR  12
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \