avcodec: deprecate AVFrame.age

This was intended as an optimisation for skipped blocks in MPEG2
P-frames and never used elsewhere.  Removing this "optimisation"
speeds up MPEG2 decoding by 1-2% (ARM Cortex-A9).

Signed-off-by: Mans Rullgard <mans@mansr.com>

1 files changed, 0 insertions, 7 deletions

diff --git a/libavcodec/pthread.c b/libavcodec/pthread.c
index 5f427c0390..7e03c64f40 100644
--- a/libavcodec/pthread.c
+++ b/libavcodec/pthread.c
@@ -855,13 +855,6 @@ int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
 
     pthread_mutex_unlock(&p->parent->buffer_mutex);
 
-    /*
-     * Buffer age is difficult to keep track of between
-     * multiple threads, and the optimizations it allows
-     * are not worth the effort. It is disabled for now.
-     */
-    f->age = INT_MAX;
-
     return err;
 }