lavc: Adding seek_preroll to AVCodecContext

seek_preroll field is added to the AVCodecContext struct. It indicates
the number of samples to be discarded whenever there is a discontinuity.
The minor version is bumped accordingly.

Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/avcodec.h

@@ -2882,6 +2882,13 @@ typedef struct AVCodecContext {
      * - encoding: unused
      */
     int skip_alpha;
+
+    /**
+     * Number of samples to skip after a discontinuity
+     * - decoding: unused
+     * - encoding: set by libavcodec
+     */
+    int seek_preroll;
 } AVCodecContext;
 
 AVRational av_codec_get_pkt_timebase         (const AVCodecContext *avctx);
@@ -2893,6 +2900,9 @@ void                     av_codec_set_codec_descriptor(AVCodecContext *avctx, co
 int  av_codec_get_lowres(const AVCodecContext *avctx);
 void av_codec_set_lowres(AVCodecContext *avctx, int val);
 
+int  av_codec_get_seek_preroll(const AVCodecContext *avctx);
+void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
+
 /**
  * AVProfile.
  */

libavcodec/utils.c

@@ -1044,6 +1044,7 @@ void avcodec_free_frame(AVFrame **frame)
 MAKE_ACCESSORS(AVCodecContext, codec, AVRational, pkt_timebase)
 MAKE_ACCESSORS(AVCodecContext, codec, const AVCodecDescriptor *, codec_descriptor)
 MAKE_ACCESSORS(AVCodecContext, codec, int, lowres)
+MAKE_ACCESSORS(AVCodecContext, codec, int, seek_preroll)
 
 int av_codec_get_max_lowres(const AVCodec *codec)
 {

libavcodec/version.h

@@ -29,7 +29,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 55
-#define LIBAVCODEC_VERSION_MINOR  35
+#define LIBAVCODEC_VERSION_MINOR  36
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \