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Set frames_since_key in vp9_get_coding_frame_num

Set frames_since_key to 0 whenever a key frame appears.

Add dependency notes to get_gop_coding_frame_num()

Change-Id: I41ff04bb1c6176e60946b05fe21c72fbb82be62a

--- a/vp9/encoder/vp9_firstpass.c

+++ b/vp9/encoder/vp9_firstpass.c

@@ -2458,6 +2458,22 @@

   int max;

 } RANGE;

+/* get_gop_coding_frame_num() depends on several fields in RATE_CONTROL *rc as

+ * follows.

+ * Static fields:

+ * (The following fields will remain unchanged after initialization of encoder.)

+ *   rc->static_scene_max_gf_interval

+ *   rc->min_gf_interval

+ *

+ * Dynamic fields:

+ * (The following fields will be updated before or after coding each frame.)

+ *   rc->frames_to_key

+ *   rc->frames_since_key

+ *   rc->source_alt_ref_active

+ *

+ * TODO(angiebird): Separate the dynamic fields and static fields into two

+ * structs.

+ */

 static int get_gop_coding_frame_num(

     int *use_alt_ref, const FRAME_INFO *frame_info,

     const FIRST_PASS_INFO *first_pass_info, const RATE_CONTROL *rc,

@@ -3675,6 +3691,7 @@

     if (rc.frames_to_key == 0) {

       rc.frames_to_key = vp9_get_frames_to_next_key(

           oxcf, frame_info, first_pass_info, show_idx, rc.min_gf_interval);

+      rc.frames_since_key = 0;

       first_is_key_frame = 1;

     }