vp9: Fixes for CONFIG_REALTIME_ONLY

For CONFIG_REALTIME_ONLY build the speed setting
is clamped to 5 (done in both the default config
and in the control for setting the speed/cpu_used),
but for !CONFIG_REALTIME_ONLY and realtime encoding
(VPX_DL_REALTIME) the speed is not clamped and can
be set down to speeds < 5.

Fix this by adding the clamp in pick_quickcompress_mode()
where the REALTIME mode is set.

Fix the kCpuUsedVectors[] in vp9_end_to_end_test.cc,
as the psnr thresholds (kPsnrThreshold[cpu_used_][encoding_mode_])
for the tests are set based on these cpu_used settings, and this
was causing failures for CONFIG_REALTIME_ONLY (which was encoding
with speed 5 but using psnr-thresholds set for speed < 5).

And fix the threshold for the ResizeCspWorks test to make it pass
at speed 5.

Bug: 454987857
Change-Id: I1669da872ac42b65b8a2fc3a6e2d795e54e33d8a

Author: marpan-max

test/resize_test.cc

@@ -773,6 +773,9 @@ class ResizeCspTest : public ResizeTest {
 
   void PreEncodeFrameHook(libvpx_test::VideoSource *video,
                           libvpx_test::Encoder *encoder) override {
+    if (video->frame() == 0) {
+      encoder->Control(VP8E_SET_CPUUSED, 5);
+    }
     if (CspForFrameNumber(video->frame()) != VPX_IMG_FMT_I420 &&
         cfg_.g_profile != 1) {
       cfg_.g_profile = 1;
@@ -787,7 +790,7 @@ class ResizeCspTest : public ResizeTest {
 
   void PSNRPktHook(const vpx_codec_cx_pkt_t *pkt) override {
     if (frame0_psnr_ == 0.) frame0_psnr_ = pkt->data.psnr.psnr[0];
-    EXPECT_NEAR(pkt->data.psnr.psnr[0], frame0_psnr_, 2.0);
+    EXPECT_NEAR(pkt->data.psnr.psnr[0], frame0_psnr_, 3.5);
   }
 
 #if WRITE_COMPRESSED_STREAM

test/vp9_end_to_end_test.cc

@@ -77,7 +77,11 @@ const libvpx_test::TestMode kEncodingModeVectors[] = {
 };
 
 // Speed settings tested
+#if CONFIG_REALTIME_ONLY
+const int kCpuUsedVectors[] = { 5, 6, 7 };
+#else
 const int kCpuUsedVectors[] = { 1, 2, 3, 5, 6, 7 };
+#endif
 
 int is_extension_y4m(const char *filename) {
   const char *dot = strrchr(filename, '.');

vp9/vp9_cx_iface.c

@@ -1220,6 +1220,7 @@ static vpx_codec_err_t pick_quickcompress_mode(vpx_codec_alg_priv_t *ctx,
   if (deadline == VPX_DL_REALTIME) {
     ctx->oxcf.pass = 0;
     new_mode = REALTIME;
+    ctx->oxcf.speed = VPXMAX(ctx->oxcf.speed, 5);
   }
 
   if (ctx->oxcf.mode != new_mode) {