shithub: libvpx

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For keyframe-only coding do not boost in q mode

If we are using keyframe only coding - either coding a
single frame, or a sequence of keyframes - in the end-usage=q
mode, use the cq_level directly as the quality of each
coded frame, rather than boost them.

Ported from AV1: 563a0d1eb92bdc1e987df071a568d8406c4ffa92

Change-Id: I6dc929b8b4f0aa18e279139077f3a87958c92245

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -1216,10 +1216,16 @@

   ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq);

   if (frame_is_intra_only(cm)) {

-    // Handle the special case for key frames forced when we have reached

-    // the maximum key frame interval. Here force the Q to a range

-    // based on the ambient Q to reduce the risk of popping.

-    if (rc->this_key_frame_forced) {

+    if (rc->frames_to_key == 1 && oxcf->rc_mode == VPX_Q) {

+      // If the next frame is also a key frame or the current frame is the

+      // only frame in the sequence in AOM_Q mode, just use the cq_level

+      // as q.

+      active_best_quality = cq_level;

+      active_worst_quality = cq_level;

+    } else if (rc->this_key_frame_forced) {

+      // Handle the special case for key frames forced when we have reached

+      // the maximum key frame interval. Here force the Q to a range

+      // based on the ambient Q to reduce the risk of popping.

       double last_boosted_q;

       int delta_qindex;

       int qindex;