Change size on first frame and change config cause crash.

Reallocation of mi buffer fails if change size on the first frame and
change config in subsequent frames. Add a condition for resolution
check to avoid assertion failure.

BUG=1074

Change-Id: Ie26ed816a57fa871ba27a72db9805baaaeaba9f3

test/resize_test.cc

@@ -196,13 +196,27 @@ class ResizeInternalTest : public ResizeTest {
 
   virtual void PreEncodeFrameHook(libvpx_test::VideoSource *video,
                                   libvpx_test::Encoder *encoder) {
-    if (video->frame() == kStepDownFrame) {
-      struct vpx_scaling_mode mode = {VP8E_FOURFIVE, VP8E_THREEFIVE};
-      encoder->Control(VP8E_SET_SCALEMODE, &mode);
-    }
-    if (video->frame() == kStepUpFrame) {
-      struct vpx_scaling_mode mode = {VP8E_NORMAL, VP8E_NORMAL};
-      encoder->Control(VP8E_SET_SCALEMODE, &mode);
+    if (change_config_) {
+      int new_q = 60;
+      if (video->frame() == 0) {
+        struct vpx_scaling_mode mode = {VP8E_ONETWO, VP8E_ONETWO};
+        encoder->Control(VP8E_SET_SCALEMODE, &mode);
+      }
+      if (video->frame() == 1) {
+        struct vpx_scaling_mode mode = {VP8E_NORMAL, VP8E_NORMAL};
+        encoder->Control(VP8E_SET_SCALEMODE, &mode);
+        cfg_.rc_min_quantizer = cfg_.rc_max_quantizer = new_q;
+        encoder->Config(&cfg_);
+      }
+    } else {
+      if (video->frame() == kStepDownFrame) {
+        struct vpx_scaling_mode mode = {VP8E_FOURFIVE, VP8E_THREEFIVE};
+        encoder->Control(VP8E_SET_SCALEMODE, &mode);
+      }
+      if (video->frame() == kStepUpFrame) {
+        struct vpx_scaling_mode mode = {VP8E_NORMAL, VP8E_NORMAL};
+        encoder->Control(VP8E_SET_SCALEMODE, &mode);
+      }
     }
   }
 
@@ -227,6 +241,7 @@ class ResizeInternalTest : public ResizeTest {
 #endif
 
   double frame0_psnr_;
+  bool change_config_;
 #if WRITE_COMPRESSED_STREAM
   FILE *outfile_;
   unsigned int out_frames_;
@@ -237,6 +252,7 @@ TEST_P(ResizeInternalTest, TestInternalResizeWorks) {
   ::libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
                                        30, 1, 0, 10);
   init_flags_ = VPX_CODEC_USE_PSNR;
+  change_config_ = false;
 
   // q picked such that initial keyframe on this clip is ~30dB PSNR
   cfg_.rc_min_quantizer = cfg_.rc_max_quantizer = 48;
@@ -261,6 +277,15 @@ TEST_P(ResizeInternalTest, TestInternalResizeWorks) {
   }
 }
 
+TEST_P(ResizeInternalTest, TestInternalResizeChangeConfig) {
+  ::libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
+                                       30, 1, 0, 10);
+  cfg_.g_w = 352;
+  cfg_.g_h = 288;
+  change_config_ = true;
+  ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
+}
+
 class ResizeInternalRealtimeTest : public ::libvpx_test::EncoderTest,
   public ::libvpx_test::CodecTestWith2Params<libvpx_test::TestMode, int> {
  protected:

vp9/encoder/vp9_encoder.c

@@ -1517,7 +1517,10 @@ void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
   }
 
   if (cpi->initial_width) {
-    if (cm->width > cpi->initial_width || cm->height > cpi->initial_height) {
+    int new_mi_size = 0;
+    vp9_set_mb_mi(cm, cm->width, cm->height);
+    new_mi_size = cm->mi_stride * calc_mi_size(cm->mi_rows);
+    if (cm->mi_alloc_size < new_mi_size) {
       vp9_free_context_buffers(cm);
       alloc_compressor_data(cpi);
       realloc_segmentation_maps(cpi);
@@ -4642,8 +4645,10 @@ int vp9_set_internal_size(VP9_COMP *cpi,
   // always go to the next whole number
   cm->width = (hs - 1 + cpi->oxcf.width * hr) / hs;
   cm->height = (vs - 1 + cpi->oxcf.height * vr) / vs;
-  assert(cm->width <= cpi->initial_width);
-  assert(cm->height <= cpi->initial_height);
+  if (cm->current_video_frame) {
+    assert(cm->width <= cpi->initial_width);
+    assert(cm->height <= cpi->initial_height);
+  }
 
   update_frame_size(cpi);