shithub: libvpx

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vp9-svc: Fix for scene detection for SVC

For spatial layers: use the correct mi_cols/rows in the
scene detection. The scene detection for spatial layers
is only called once per superframe, but we were using wrong
mi_cols/rows (those for base spatial were being used).

Also increase frame_since_key threshold to account for spatial
layers.

Change-Id: I2731da49684a798c4718693a0468eda7db82d2bd

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

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

@@ -2636,6 +2636,8 @@

   if (cpi->svc.spatial_layer_id == 0 && src_width == last_src_width &&

       src_height == last_src_height) {

     YV12_BUFFER_CONFIG *frames[MAX_LAG_BUFFERS] = { NULL };

+    int num_mi_cols = cm->mi_cols;

+    int num_mi_rows = cm->mi_rows;

     int start_frame = 0;

     int frames_to_buffer = 1;

     int frame = 0;

@@ -2650,6 +2652,12 @@

       min_thresh = 65000;

       thresh = 2.1f;

     }

+    if (cpi->use_svc && cpi->svc.number_spatial_layers > 1) {

+      const int aligned_width = ALIGN_POWER_OF_TWO(src_width, MI_SIZE_LOG2);

+      const int aligned_height = ALIGN_POWER_OF_TWO(src_height, MI_SIZE_LOG2);

+      num_mi_cols = aligned_width >> MI_SIZE_LOG2;

+      num_mi_rows = aligned_height >> MI_SIZE_LOG2;

+    }

     if (cpi->oxcf.lag_in_frames > 0) {

       frames_to_buffer = (cm->current_video_frame == 1)

                              ? (int)vp9_lookahead_depth(cpi->lookahead) - 1

@@ -2696,8 +2704,8 @@

         uint64_t avg_sad = 0;

         uint64_t tmp_sad = 0;

         int num_samples = 0;

-        int sb_cols = (cm->mi_cols + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE;

-        int sb_rows = (cm->mi_rows + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE;

+        int sb_cols = (num_mi_cols + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE;

+        int sb_rows = (num_mi_rows + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE;

         if (cpi->oxcf.lag_in_frames > 0) {

           src_y = frames[frame]->y_buffer;

           src_ystride = frames[frame]->y_stride;

@@ -2733,7 +2741,7 @@

           if (avg_sad >

                   VPXMAX(min_thresh,

                          (unsigned int)(rc->avg_source_sad[0] * thresh)) &&

-              rc->frames_since_key > 1 &&

+              rc->frames_since_key > 1 + cpi->svc.number_spatial_layers &&

               num_zero_temp_sad < 3 * (num_samples >> 2))

             rc->high_source_sad = 1;

           else