lavc: implement accessors for some AVFrame fields.

Compared to av_opt_ptr, accessors bring:

- better performance (negligible);
- compile-time type check;
- link-time existence check
  (or at worst, a dynamic linker error instead of a NULL dereference).

1 files changed, 9 insertions, 0 deletions

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 4b6ddeae1c..71227e942a 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -672,6 +672,15 @@ AVFrame *avcodec_alloc_frame(void){
     return pic;
 }
 
+#define MAKE_ACCESSORS(str, name, type, field) \
+    type av_##name##_get_##field(const str *s) { return s->field; } \
+    void av_##name##_set_##field(str *s, type v) { s->field = v; }
+
+MAKE_ACCESSORS(AVFrame, frame, int64_t, best_effort_timestamp)
+MAKE_ACCESSORS(AVFrame, frame, int64_t, pkt_pos)
+MAKE_ACCESSORS(AVFrame, frame, int64_t, channel_layout)
+MAKE_ACCESSORS(AVFrame, frame, int,     sample_rate)
+
 static void avcodec_get_subtitle_defaults(AVSubtitle *sub)
 {
     memset(sub, 0, sizeof(*sub));