Merge "Make encoder buffer allocation dynamic"

11 files changed, 171 insertions, 103 deletions

diff --git a/vp9/encoder/vp9_bitstream.c b/vp9/encoder/vp9_bitstream.c
index 3a70364ae..b24fe2950 100644
--- a/vp9/encoder/vp9_bitstream.c
+++ b/vp9/encoder/vp9_bitstream.c
@@ -989,8 +989,6 @@ static void write_frame_size_with_refs(VP9_COMP *cpi,
   MV_REFERENCE_FRAME ref_frame;
   for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ++ref_frame) {
     YV12_BUFFER_CONFIG *cfg = get_ref_frame_buffer(cpi, ref_frame);
-    found = cm->width == cfg->y_crop_width &&
-            cm->height == cfg->y_crop_height;
 
     // Set "found" to 0 for temporal svc and for spatial svc key frame
     if (cpi->use_svc &&
@@ -1003,6 +1001,9 @@ static void write_frame_size_with_refs(VP9_COMP *cpi,
          cpi->svc.layer_context[0].frames_from_key_frame <
          cpi->svc.number_temporal_layers + 1))) {
       found = 0;
+    } else if (cfg != NULL) {
+      found = cm->width == cfg->y_crop_width &&
+              cm->height == cfg->y_crop_height;
     }
     vp9_wb_write_bit(wb, found);
     if (found) {
@@ -1114,7 +1115,8 @@ static void write_uncompressed_header(VP9_COMP *cpi,
       MV_REFERENCE_FRAME ref_frame;
       vp9_wb_write_literal(wb, get_refresh_mask(cpi), REF_FRAMES);
       for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ++ref_frame) {
-        vp9_wb_write_literal(wb, get_ref_frame_idx(cpi, ref_frame),
+        assert(get_ref_frame_map_idx(cpi, ref_frame) != INVALID_IDX);
+        vp9_wb_write_literal(wb, get_ref_frame_map_idx(cpi, ref_frame),
                              REF_FRAMES_LOG2);
         vp9_wb_write_bit(wb, cm->ref_frame_sign_bias[ref_frame]);
       }
diff --git a/vp9/encoder/vp9_encodeframe.c b/vp9/encoder/vp9_encodeframe.c
index 2bdb9915c..3125a0eb7 100644
--- a/vp9/encoder/vp9_encodeframe.c
+++ b/vp9/encoder/vp9_encodeframe.c
@@ -144,12 +144,14 @@ static unsigned int get_sby_perpixel_diff_variance(VP9_COMP *cpi,
                                                    const struct buf_2d *ref,
                                                    int mi_row, int mi_col,
                                                    BLOCK_SIZE bs) {
+  unsigned int sse, var;
+  uint8_t *last_y;
   const YV12_BUFFER_CONFIG *last = get_ref_frame_buffer(cpi, LAST_FRAME);
-  const uint8_t* last_y = &last->y_buffer[mi_row * MI_SIZE * last->y_stride +
-                                              mi_col * MI_SIZE];
-  unsigned int sse;
-  const unsigned int var = cpi->fn_ptr[bs].vf(ref->buf, ref->stride,
-                                              last_y, last->y_stride, &sse);
+
+  assert(last != NULL);
+  last_y =
+      &last->y_buffer[mi_row * MI_SIZE * last->y_stride + mi_col * MI_SIZE];
+  var = cpi->fn_ptr[bs].vf(ref->buf, ref->stride, last_y, last->y_stride, &sse);
   return ROUND_POWER_OF_TWO(var, num_pels_log2_lookup[bs]);
 }
 
@@ -667,7 +669,7 @@ static unsigned int motion_estimation(VP9_COMP *cpi, MACROBLOCK *x,
 #endif
 
 // This function chooses partitioning based on the variance between source and
-// reconstructed last, where variance is computed for downs-sampled inputs.
+// reconstructed last, where variance is computed for down-sampled inputs.
 static void choose_partitioning(VP9_COMP *cpi,
                                 const TileInfo *const tile,
                                 MACROBLOCK *x,
@@ -682,7 +684,6 @@ static void choose_partitioning(VP9_COMP *cpi,
   int sp;
   int dp;
   int pixels_wide = 64, pixels_high = 64;
-  const YV12_BUFFER_CONFIG *yv12 = get_ref_frame_buffer(cpi, LAST_FRAME);
 
   // Always use 4x4 partition for key frame.
   const int is_key_frame = (cm->frame_type == KEY_FRAME);
@@ -714,6 +715,8 @@ static void choose_partitioning(VP9_COMP *cpi,
     unsigned int y_sad;
     BLOCK_SIZE bsize;
 #endif
+    const YV12_BUFFER_CONFIG *yv12 = get_ref_frame_buffer(cpi, LAST_FRAME);
+    assert(yv12 != NULL);
     vp9_setup_pre_planes(xd, 0, yv12, mi_row, mi_col,
         &cm->frame_refs[LAST_FRAME - 1].sf);
     mbmi->ref_frame[0] = LAST_FRAME;
@@ -4186,6 +4189,7 @@ static void encode_superblock(VP9_COMP *cpi, ThreadData *td,
     for (ref = 0; ref < 1 + is_compound; ++ref) {
       YV12_BUFFER_CONFIG *cfg = get_ref_frame_buffer(cpi,
                                                      mbmi->ref_frame[ref]);
+      assert(cfg != NULL);
       vp9_setup_pre_planes(xd, ref, cfg, mi_row, mi_col,
                            &xd->block_refs[ref]->sf);
     }
diff --git a/vp9/encoder/vp9_encoder.c b/vp9/encoder/vp9_encoder.c
index bd7e0b64c..249c2363d 100644
--- a/vp9/encoder/vp9_encoder.c
+++ b/vp9/encoder/vp9_encoder.c
@@ -483,6 +483,7 @@ static void alloc_raw_frame_buffers(VP9_COMP *cpi) {
     vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
                        "Failed to allocate lag buffers");
 
+  // TODO(agrange) Check if ARF is enabled and skip allocation if not.
   if (vp9_realloc_frame_buffer(&cpi->alt_ref_buffer,
                                oxcf->width, oxcf->height,
                                cm->subsampling_x, cm->subsampling_y,
@@ -495,13 +496,6 @@ static void alloc_raw_frame_buffers(VP9_COMP *cpi) {
                        "Failed to allocate altref buffer");
 }
 
-static void alloc_ref_frame_buffers(VP9_COMP *cpi) {
-  VP9_COMMON *const cm = &cpi->common;
-  if (vp9_alloc_ref_frame_buffers(cm, cm->width, cm->height))
-    vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
-                       "Failed to allocate frame buffers");
-}
-
 static void alloc_util_frame_buffers(VP9_COMP *cpi) {
   VP9_COMMON *const cm = &cpi->common;
   if (vp9_realloc_frame_buffer(&cpi->last_frame_uf,
@@ -2483,6 +2477,21 @@ static void loopfilter_frame(VP9_COMP *cpi, VP9_COMMON *cm) {
   vp9_extend_frame_inner_borders(cm->frame_to_show);
 }
 
+static INLINE void alloc_frame_mvs(const VP9_COMMON *cm,
+                                   int buffer_idx) {
+  RefCntBuffer *const new_fb_ptr = &cm->buffer_pool->frame_bufs[buffer_idx];
+  if (new_fb_ptr->mvs == NULL ||
+      new_fb_ptr->mi_rows < cm->mi_rows ||
+      new_fb_ptr->mi_cols < cm->mi_cols) {
+    vpx_free(new_fb_ptr->mvs);
+    new_fb_ptr->mvs =
+      (MV_REF *)vpx_calloc(cm->mi_rows * cm->mi_cols,
+                           sizeof(*new_fb_ptr->mvs));
+    new_fb_ptr->mi_rows = cm->mi_rows;
+    new_fb_ptr->mi_cols = cm->mi_cols;
+  }
+}
+
 void vp9_scale_references(VP9_COMP *cpi) {
   VP9_COMMON *cm = &cpi->common;
   MV_REFERENCE_FRAME ref_frame;
@@ -2491,13 +2500,19 @@ void vp9_scale_references(VP9_COMP *cpi) {
   for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ++ref_frame) {
     // Need to convert from VP9_REFFRAME to index into ref_mask (subtract 1).
     if (cpi->ref_frame_flags & ref_mask[ref_frame - 1]) {
-      const int idx = cm->ref_frame_map[get_ref_frame_idx(cpi, ref_frame)];
-       BufferPool *const pool = cm->buffer_pool;
-      const YV12_BUFFER_CONFIG *const ref = &pool->frame_bufs[idx].buf;
+      BufferPool *const pool = cm->buffer_pool;
+      const YV12_BUFFER_CONFIG *const ref = get_ref_frame_buffer(cpi,
+                                                                 ref_frame);
+
+      if (ref == NULL) {
+        cpi->scaled_ref_idx[ref_frame - 1] = INVALID_IDX;
+        continue;
+      }
 
 #if CONFIG_VP9_HIGHBITDEPTH
       if (ref->y_crop_width != cm->width || ref->y_crop_height != cm->height) {
         const int new_fb = get_free_fb(cm);
+        RefCntBuffer *const new_fb_ptr = &pool->frame_bufs[new_fb];
         cm->cur_frame = &pool->frame_bufs[new_fb];
         vp9_realloc_frame_buffer(&pool->frame_bufs[new_fb].buf,
                                  cm->width, cm->height,
@@ -2505,35 +2520,28 @@ void vp9_scale_references(VP9_COMP *cpi) {
                                  cm->use_highbitdepth,
                                  VP9_ENC_BORDER_IN_PIXELS, cm->byte_alignment,
                                  NULL, NULL, NULL);
-        scale_and_extend_frame(ref, &pool->frame_bufs[new_fb].buf,
-                               (int)cm->bit_depth);
+        scale_and_extend_frame(ref, &new_fb_ptr->buf, (int)cm->bit_depth);
 #else
       if (ref->y_crop_width != cm->width || ref->y_crop_height != cm->height) {
         const int new_fb = get_free_fb(cm);
-        vp9_realloc_frame_buffer(&pool->frame_bufs[new_fb].buf,
+        RefCntBuffer *const new_fb_ptr = &pool->frame_bufs[new_fb];
+        vp9_realloc_frame_buffer(&new_fb_ptr->buf,
                                  cm->width, cm->height,
                                  cm->subsampling_x, cm->subsampling_y,
                                  VP9_ENC_BORDER_IN_PIXELS, cm->byte_alignment,
                                  NULL, NULL, NULL);
-        scale_and_extend_frame(ref, &pool->frame_bufs[new_fb].buf);
+        scale_and_extend_frame(ref, &new_fb_ptr->buf);
 #endif  // CONFIG_VP9_HIGHBITDEPTH
         cpi->scaled_ref_idx[ref_frame - 1] = new_fb;
-        if (pool->frame_bufs[new_fb].mvs == NULL ||
-            pool->frame_bufs[new_fb].mi_rows < cm->mi_rows ||
-            pool->frame_bufs[new_fb].mi_cols < cm->mi_cols) {
-          vpx_free(pool->frame_bufs[new_fb].mvs);
-          pool->frame_bufs[new_fb].mvs =
-            (MV_REF *)vpx_calloc(cm->mi_rows * cm->mi_cols,
-                                 sizeof(*pool->frame_bufs[new_fb].mvs));
-          pool->frame_bufs[new_fb].mi_rows = cm->mi_rows;
-          pool->frame_bufs[new_fb].mi_cols = cm->mi_cols;
-        }
+
+        alloc_frame_mvs(cm, new_fb);
       } else {
-        cpi->scaled_ref_idx[ref_frame - 1] = idx;
-        ++pool->frame_bufs[idx].ref_count;
+        const int buf_idx = get_ref_frame_buf_idx(cpi, ref_frame);
+        cpi->scaled_ref_idx[ref_frame - 1] = buf_idx;
+        ++pool->frame_bufs[buf_idx].ref_count;
       }
     } else {
-      cpi->scaled_ref_idx[ref_frame - 1] = INVALID_REF_BUFFER_IDX;
+      cpi->scaled_ref_idx[ref_frame - 1] = INVALID_IDX;
     }
   }
 }
@@ -2543,11 +2551,11 @@ static void release_scaled_references(VP9_COMP *cpi) {
   int i;
   for (i = 0; i < MAX_REF_FRAMES; ++i) {
     const int idx = cpi->scaled_ref_idx[i];
-    RefCntBuffer *const buf = idx != INVALID_REF_BUFFER_IDX ?
+    RefCntBuffer *const buf = idx != INVALID_IDX ?
         &cm->buffer_pool->frame_bufs[idx] : NULL;
     if (buf != NULL) {
       --buf->ref_count;
-      cpi->scaled_ref_idx[i] = INVALID_REF_BUFFER_IDX;
+      cpi->scaled_ref_idx[i] = INVALID_IDX;
     }
   }
 }
@@ -2751,6 +2759,8 @@ void set_frame_size(VP9_COMP *cpi) {
     vp9_set_target_rate(cpi);
   }
 
+  alloc_frame_mvs(cm, cm->new_fb_idx);
+
   // Reset the frame pointers to the current frame size.
   vp9_realloc_frame_buffer(get_frame_new_buffer(cm),
                            cm->width, cm->height,
@@ -2765,24 +2775,30 @@ void set_frame_size(VP9_COMP *cpi) {
   init_motion_estimation(cpi);
 
   for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ++ref_frame) {
-    const int idx = cm->ref_frame_map[get_ref_frame_idx(cpi, ref_frame)];
-    YV12_BUFFER_CONFIG *const buf = &cm->buffer_pool->frame_bufs[idx].buf;
     RefBuffer *const ref_buf = &cm->frame_refs[ref_frame - 1];
-    ref_buf->buf = buf;
-    ref_buf->idx = idx;
+    const int buf_idx = get_ref_frame_buf_idx(cpi, ref_frame);
+
+    ref_buf->idx = buf_idx;
+
+    if (buf_idx != INVALID_IDX) {
+      YV12_BUFFER_CONFIG *const buf = &cm->buffer_pool->frame_bufs[buf_idx].buf;
+      ref_buf->buf = buf;
 #if CONFIG_VP9_HIGHBITDEPTH
-    vp9_setup_scale_factors_for_frame(&ref_buf->sf,
-                                      buf->y_crop_width, buf->y_crop_height,
-                                      cm->width, cm->height,
-                                      (buf->flags & YV12_FLAG_HIGHBITDEPTH) ?
-                                          1 : 0);
+      vp9_setup_scale_factors_for_frame(&ref_buf->sf,
+                                        buf->y_crop_width, buf->y_crop_height,
+                                        cm->width, cm->height,
+                                        (buf->flags & YV12_FLAG_HIGHBITDEPTH) ?
+                                            1 : 0);
 #else
-    vp9_setup_scale_factors_for_frame(&ref_buf->sf,
-                                      buf->y_crop_width, buf->y_crop_height,
-                                      cm->width, cm->height);
+      vp9_setup_scale_factors_for_frame(&ref_buf->sf,
+                                        buf->y_crop_width, buf->y_crop_height,
+                                        cm->width, cm->height);
 #endif  // CONFIG_VP9_HIGHBITDEPTH
-    if (vp9_is_scaled(&ref_buf->sf))
-      vp9_extend_frame_borders(buf);
+      if (vp9_is_scaled(&ref_buf->sf))
+        vp9_extend_frame_borders(buf);
+    } else {
+      ref_buf->buf = NULL;
+    }
   }
 
   set_ref_ptrs(cm, xd, LAST_FRAME, LAST_FRAME);
@@ -3448,6 +3464,16 @@ static void Pass2Encode(VP9_COMP *cpi, size_t *size,
     vp9_twopass_postencode_update(cpi);
 }
 
+static void init_ref_frame_bufs(VP9_COMMON *cm) {
+  int i;
+  BufferPool *const pool = cm->buffer_pool;
+  cm->new_fb_idx = INVALID_IDX;
+  for (i = 0; i < REF_FRAMES; ++i) {
+    cm->ref_frame_map[i] = INVALID_IDX;
+    pool->frame_bufs[i].ref_count = 0;
+  }
+}
+
 static void check_initial_width(VP9_COMP *cpi,
 #if CONFIG_VP9_HIGHBITDEPTH
                                 int use_highbitdepth,
@@ -3468,7 +3494,7 @@ static void check_initial_width(VP9_COMP *cpi,
 #endif
 
     alloc_raw_frame_buffers(cpi);
-    alloc_ref_frame_buffers(cpi);
+    init_ref_frame_bufs(cm);
     alloc_util_frame_buffers(cpi);
 
     init_motion_estimation(cpi);  // TODO(agrange) This can be removed.
@@ -3793,8 +3819,14 @@ int vp9_get_compressed_data(VP9_COMP *cpi, unsigned int *frame_flags,
 
   // Find a free buffer for the new frame, releasing the reference previously
   // held.
-  pool->frame_bufs[cm->new_fb_idx].ref_count--;
+  if (cm->new_fb_idx != INVALID_IDX) {
+    --pool->frame_bufs[cm->new_fb_idx].ref_count;
+  }
   cm->new_fb_idx = get_free_fb(cm);
+
+  if (cm->new_fb_idx == INVALID_IDX)
+    return -1;
+
   cm->cur_frame = &pool->frame_bufs[cm->new_fb_idx];
 
   if (!cpi->use_svc && cpi->multi_arf_allowed) {
@@ -3821,7 +3853,7 @@ int vp9_get_compressed_data(VP9_COMP *cpi, unsigned int *frame_flags,
   }
 
   for (i = 0; i < MAX_REF_FRAMES; ++i)
-    cpi->scaled_ref_idx[i] = INVALID_REF_BUFFER_IDX;
+    cpi->scaled_ref_idx[i] = INVALID_IDX;
 
   if (oxcf->pass == 1 &&
       (!cpi->use_svc || is_two_pass_svc(cpi))) {
@@ -3907,8 +3939,18 @@ int vp9_get_compressed_data(VP9_COMP *cpi, unsigned int *frame_flags,
           PSNR_STATS psnr2;
           double frame_ssim2 = 0, weight = 0;
 #if CONFIG_VP9_POSTPROC
-          // TODO(agrange) Add resizing of post-proc buffer in here when the
-          // encoder is changed to use on-demand buffer allocation.
+          if (vp9_alloc_frame_buffer(&cm->post_proc_buffer,
+                                     recon->y_crop_width, recon->y_crop_height,
+                                     cm->subsampling_x, cm->subsampling_y,
+#if CONFIG_VP9_HIGHBITDEPTH
+                                     cm->use_highbitdepth,
+#endif
+                                     VP9_ENC_BORDER_IN_PIXELS,
+                                     cm->byte_alignment) < 0) {
+            vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
+                               "Failed to allocate post processing buffer");
+          }
+
           vp9_deblock(cm->frame_to_show, &cm->post_proc_buffer,
                       cm->lf.filter_level * 10 / 6);
 #endif
diff --git a/vp9/encoder/vp9_encoder.h b/vp9/encoder/vp9_encoder.h
index 69edfded1..c3679ca0b 100644
--- a/vp9/encoder/vp9_encoder.h
+++ b/vp9/encoder/vp9_encoder.h
@@ -17,6 +17,7 @@
 #include "vpx/internal/vpx_codec_internal.h"
 #include "vpx/vp8cx.h"
 
+#include "vp9/common/vp9_alloccommon.h"
 #include "vp9/common/vp9_ppflags.h"
 #include "vp9/common/vp9_entropymode.h"
 #include "vp9/common/vp9_thread_common.h"
@@ -47,7 +48,6 @@ extern "C" {
 #endif
 
 #define DEFAULT_GF_INTERVAL         10
-#define INVALID_REF_BUFFER_IDX      -1  // Marks an invalid reference buffer id.
 
 typedef struct {
   int nmvjointcost[MV_JOINTS];
@@ -517,8 +517,8 @@ static INLINE int frame_is_kf_gf_arf(const VP9_COMP *cpi) {
          (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref);
 }
 
-static INLINE int get_ref_frame_idx(const VP9_COMP *cpi,
-                                    MV_REFERENCE_FRAME ref_frame) {
+static INLINE int get_ref_frame_map_idx(const VP9_COMP *cpi,
+                                        MV_REFERENCE_FRAME ref_frame) {
   if (ref_frame == LAST_FRAME) {
     return cpi->lst_fb_idx;
   } else if (ref_frame == GOLDEN_FRAME) {
@@ -528,12 +528,19 @@ static INLINE int get_ref_frame_idx(const VP9_COMP *cpi,
   }
 }
 
+static INLINE int get_ref_frame_buf_idx(const VP9_COMP *const cpi,
+                                        int ref_frame) {
+  const VP9_COMMON *const cm = &cpi->common;
+  const int map_idx = get_ref_frame_map_idx(cpi, ref_frame);
+  return (map_idx != INVALID_IDX) ? cm->ref_frame_map[map_idx] : INVALID_IDX;
+}
+
 static INLINE YV12_BUFFER_CONFIG *get_ref_frame_buffer(
     VP9_COMP *cpi, MV_REFERENCE_FRAME ref_frame) {
   VP9_COMMON *const cm = &cpi->common;
-  BufferPool *const pool = cm->buffer_pool;
-  return &pool->frame_bufs[cm->ref_frame_map[get_ref_frame_idx(cpi, ref_frame)]]
-      .buf;
+  const int buf_idx = get_ref_frame_buf_idx(cpi, ref_frame);
+  return
+      buf_idx != INVALID_IDX ? &cm->buffer_pool->frame_bufs[buf_idx].buf : NULL;
 }
 
 static INLINE int get_token_alloc(int mb_rows, int mb_cols) {
diff --git a/vp9/encoder/vp9_firstpass.c b/vp9/encoder/vp9_firstpass.c
index b813e7de0..35cf88117 100644
--- a/vp9/encoder/vp9_firstpass.c
+++ b/vp9/encoder/vp9_firstpass.c
@@ -66,12 +66,6 @@
 unsigned int arf_count = 0;
 #endif
 
-static void swap_yv12(YV12_BUFFER_CONFIG *a, YV12_BUFFER_CONFIG *b) {
-  YV12_BUFFER_CONFIG temp = *a;
-  *a = *b;
-  *b = temp;
-}
-
 // Resets the first pass file to the given position using a relative seek from
 // the current position.
 static void reset_fpf_position(TWO_PASS *p,
@@ -465,12 +459,6 @@ void vp9_first_pass(VP9_COMP *cpi, const struct lookahead_entry *source) {
   int i;
 
   int recon_yoffset, recon_uvoffset;
-  YV12_BUFFER_CONFIG *const lst_yv12 = get_ref_frame_buffer(cpi, LAST_FRAME);
-  YV12_BUFFER_CONFIG *gld_yv12 = get_ref_frame_buffer(cpi, GOLDEN_FRAME);
-  YV12_BUFFER_CONFIG *const new_yv12 = get_frame_new_buffer(cm);
-  int recon_y_stride = lst_yv12->y_stride;
-  int recon_uv_stride = lst_yv12->uv_stride;
-  int uv_mb_height = 16 >> (lst_yv12->y_height > lst_yv12->uv_height);
   int64_t intra_error = 0;
   int64_t coded_error = 0;
   int64_t sr_coded_error = 0;
@@ -488,11 +476,26 @@ void vp9_first_pass(VP9_COMP *cpi, const struct lookahead_entry *source) {
   MV lastmv = {0, 0};
   TWO_PASS *twopass = &cpi->twopass;
   const MV zero_mv = {0, 0};
+  int recon_y_stride, recon_uv_stride, uv_mb_height;
+
+  YV12_BUFFER_CONFIG *const lst_yv12 = get_ref_frame_buffer(cpi, LAST_FRAME);
+  YV12_BUFFER_CONFIG *gld_yv12 = get_ref_frame_buffer(cpi, GOLDEN_FRAME);
+  YV12_BUFFER_CONFIG *const new_yv12 = get_frame_new_buffer(cm);
   const YV12_BUFFER_CONFIG *first_ref_buf = lst_yv12;
+
   LAYER_CONTEXT *const lc = is_two_pass_svc(cpi) ?
         &cpi->svc.layer_context[cpi->svc.spatial_layer_id] : NULL;
   double intra_factor;
   double brightness_factor;
+  BufferPool *const pool = cm->buffer_pool;
+
+  // First pass code requires valid last and new frame buffers.
+  assert(new_yv12 != NULL);
+  assert((lc != NULL) || frame_is_intra_only(cm) || (lst_yv12 != NULL));
+
+  recon_y_stride = new_yv12->y_stride;
+  recon_uv_stride = new_yv12->uv_stride;
+  uv_mb_height = 16 >> (new_yv12->y_height > new_yv12->uv_height);
 
 #if CONFIG_FP_MB_STATS
   if (cpi->use_fp_mb_stats) {
@@ -537,13 +540,10 @@ void vp9_first_pass(VP9_COMP *cpi, const struct lookahead_entry *source) {
     }
 
     if (cpi->ref_frame_flags & VP9_GOLD_FLAG) {
-      BufferPool *const pool = cm->buffer_pool;
-      const int ref_idx =
-          cm->ref_frame_map[get_ref_frame_idx(cpi, GOLDEN_FRAME)];
-      const int scaled_idx = cpi->scaled_ref_idx[GOLDEN_FRAME - 1];
-
-      gld_yv12 = (scaled_idx != ref_idx) ? &pool->frame_bufs[scaled_idx].buf :
-                 get_ref_frame_buffer(cpi, GOLDEN_FRAME);
+      gld_yv12 = vp9_get_scaled_ref_frame(cpi, GOLDEN_FRAME);
+      if (gld_yv12 == NULL) {
+        gld_yv12 = get_ref_frame_buffer(cpi, GOLDEN_FRAME);
+      }
     } else {
       gld_yv12 = NULL;
     }
@@ -563,9 +563,12 @@ void vp9_first_pass(VP9_COMP *cpi, const struct lookahead_entry *source) {
   vp9_setup_block_planes(&x->e_mbd, cm->subsampling_x, cm->subsampling_y);
 
   vp9_setup_src_planes(x, cpi->Source, 0, 0);
-  vp9_setup_pre_planes(xd, 0, first_ref_buf, 0, 0, NULL);
   vp9_setup_dst_planes(xd->plane, new_yv12, 0, 0);
 
+  if (!frame_is_intra_only(cm)) {
+    vp9_setup_pre_planes(xd, 0, first_ref_buf, 0, 0, NULL);
+  }
+
   xd->mi = cm->mi;
   xd->mi[0].src_mi = &xd->mi[0];
 
@@ -1020,7 +1023,8 @@ void vp9_first_pass(VP9_COMP *cpi, const struct lookahead_entry *source) {
        ((twopass->this_frame_stats.intra_error /
          DOUBLE_DIVIDE_CHECK(twopass->this_frame_stats.coded_error)) > 2.0))) {
     if (gld_yv12 != NULL) {
-      vp8_yv12_copy_frame(lst_yv12, gld_yv12);
+      ref_cnt_fb(pool->frame_bufs, &cm->ref_frame_map[cpi->gld_fb_idx],
+                 cm->ref_frame_map[cpi->lst_fb_idx]);
     }
     twopass->sr_update_lag = 1;
   } else {
@@ -1032,14 +1036,17 @@ void vp9_first_pass(VP9_COMP *cpi, const struct lookahead_entry *source) {
   if (lc != NULL) {
     vp9_update_reference_frames(cpi);
   } else {
-    // Swap frame pointers so last frame refers to the frame we just compressed.
-    swap_yv12(lst_yv12, new_yv12);
+    // The frame we just compressed now becomes the last frame.
+    ref_cnt_fb(pool->frame_bufs, &cm->ref_frame_map[cpi->lst_fb_idx],
+               cm->new_fb_idx);
   }
 
   // Special case for the first frame. Copy into the GF buffer as a second
   // reference.
-  if (cm->current_video_frame == 0 && gld_yv12 != NULL && lc == NULL) {
-    vp8_yv12_copy_frame(lst_yv12, gld_yv12);
+  if (cm->current_video_frame == 0 && cpi->gld_fb_idx != INVALID_IDX &&
+      lc == NULL) {
+    ref_cnt_fb(pool->frame_bufs, &cm->ref_frame_map[cpi->gld_fb_idx],
+               cm->ref_frame_map[cpi->lst_fb_idx]);
   }
 
   // Use this to see what the first pass reconstruction looks like.
diff --git a/vp9/encoder/vp9_mbgraph.c b/vp9/encoder/vp9_mbgraph.c
index 18a8c72c4..b3a8df924 100644
--- a/vp9/encoder/vp9_mbgraph.c
+++ b/vp9/encoder/vp9_mbgraph.c
@@ -376,6 +376,8 @@ void vp9_update_mbgraph_stats(VP9_COMP *cpi) {
   int i, n_frames = vp9_lookahead_depth(cpi->lookahead);
   YV12_BUFFER_CONFIG *golden_ref = get_ref_frame_buffer(cpi, GOLDEN_FRAME);
 
+  assert(golden_ref != NULL);
+
   // we need to look ahead beyond where the ARF transitions into
   // being a GF - so exit if we don't look ahead beyond that
   if (n_frames <= cpi->rc.frames_till_gf_update_due)
diff --git a/vp9/encoder/vp9_pickmode.c b/vp9/encoder/vp9_pickmode.c
index 1e88201be..2f9cccb99 100644
--- a/vp9/encoder/vp9_pickmode.c
+++ b/vp9/encoder/vp9_pickmode.c
@@ -689,12 +689,13 @@ void vp9_pick_inter_mode(VP9_COMP *cpi, MACROBLOCK *x,
 #endif
 
   for (ref_frame = LAST_FRAME; ref_frame <= GOLDEN_FRAME; ++ref_frame) {
+    const YV12_BUFFER_CONFIG *yv12 = get_ref_frame_buffer(cpi, ref_frame);
+
     x->pred_mv_sad[ref_frame] = INT_MAX;
     frame_mv[NEWMV][ref_frame].as_int = INVALID_MV;
     frame_mv[ZEROMV][ref_frame].as_int = 0;
 
-    if (cpi->ref_frame_flags & flag_list[ref_frame]) {
-      const YV12_BUFFER_CONFIG *yv12 = get_ref_frame_buffer(cpi, ref_frame);
+    if ((cpi->ref_frame_flags & flag_list[ref_frame]) && (yv12 != NULL)) {
       int_mv *const candidates = mbmi->ref_mvs[ref_frame];
       const struct scale_factors *const sf = &cm->frame_refs[ref_frame - 1].sf;
 
@@ -1076,11 +1077,11 @@ void vp9_pick_inter_mode_sub8x8(VP9_COMP *cpi, MACROBLOCK *x,
   ctx->pred_pixel_ready = 0;
 
   for (ref_frame = LAST_FRAME; ref_frame <= GOLDEN_FRAME; ++ref_frame) {
+    const YV12_BUFFER_CONFIG *yv12 = get_ref_frame_buffer(cpi, ref_frame);
     int_mv dummy_mv[2];
     x->pred_mv_sad[ref_frame] = INT_MAX;
 
-    if (cpi->ref_frame_flags & flag_list[ref_frame]) {
-      const YV12_BUFFER_CONFIG *yv12 = get_ref_frame_buffer(cpi, ref_frame);
+    if ((cpi->ref_frame_flags & flag_list[ref_frame]) && (yv12 != NULL)) {
       int_mv *const candidates = mbmi->ref_mvs[ref_frame];
       const struct scale_factors *const sf =
                              &cm->frame_refs[ref_frame - 1].sf;
diff --git a/vp9/encoder/vp9_rd.c b/vp9/encoder/vp9_rd.c
index 0b6d11eca..5cc980cf7 100644
--- a/vp9/encoder/vp9_rd.c
+++ b/vp9/encoder/vp9_rd.c
@@ -532,13 +532,14 @@ int16_t* vp9_raster_block_offset_int16(BLOCK_SIZE plane_bsize,
   return base + vp9_raster_block_offset(plane_bsize, raster_block, stride);
 }
 
-const YV12_BUFFER_CONFIG *vp9_get_scaled_ref_frame(const VP9_COMP *cpi,
-                                                   int ref_frame) {
+YV12_BUFFER_CONFIG *vp9_get_scaled_ref_frame(const VP9_COMP *cpi,
+                                             int ref_frame) {
   const VP9_COMMON *const cm = &cpi->common;
-  const int ref_idx = cm->ref_frame_map[get_ref_frame_idx(cpi, ref_frame)];
   const int scaled_idx = cpi->scaled_ref_idx[ref_frame - 1];
-  return (scaled_idx != ref_idx) ?
-      &cm->buffer_pool->frame_bufs[scaled_idx].buf : NULL;
+  const int ref_idx = get_ref_frame_buf_idx(cpi, ref_frame);
+  return
+      (scaled_idx != ref_idx && scaled_idx != INVALID_IDX) ?
+          &cm->buffer_pool->frame_bufs[scaled_idx].buf : NULL;
 }
 
 int vp9_get_switchable_rate(const VP9_COMP *cpi, const MACROBLOCKD *const xd) {
diff --git a/vp9/encoder/vp9_rd.h b/vp9/encoder/vp9_rd.h
index 59a87cf98..b18a81659 100644
--- a/vp9/encoder/vp9_rd.h
+++ b/vp9/encoder/vp9_rd.h
@@ -147,8 +147,8 @@ int vp9_raster_block_offset(BLOCK_SIZE plane_bsize,
 int16_t* vp9_raster_block_offset_int16(BLOCK_SIZE plane_bsize,
                                        int raster_block, int16_t *base);
 
-const YV12_BUFFER_CONFIG *vp9_get_scaled_ref_frame(const struct VP9_COMP *cpi,
-                                                   int ref_frame);
+YV12_BUFFER_CONFIG *vp9_get_scaled_ref_frame(const struct VP9_COMP *cpi,
+                                             int ref_frame);
 
 void vp9_init_me_luts();
 
diff --git a/vp9/encoder/vp9_rdopt.c b/vp9/encoder/vp9_rdopt.c
index 53a5dba19..8009854e3 100644
--- a/vp9/encoder/vp9_rdopt.c
+++ b/vp9/encoder/vp9_rdopt.c
@@ -2022,6 +2022,8 @@ static void setup_buffer_inter(VP9_COMP *cpi, MACROBLOCK *x,
   int_mv *const candidates = mi->mbmi.ref_mvs[ref_frame];
   const struct scale_factors *const sf = &cm->frame_refs[ref_frame - 1].sf;
 
+  assert(yv12 != NULL);
+
   // TODO(jkoleszar): Is the UV buffer ever used here? If so, need to make this
   // use the UV scaling factors.
   vp9_setup_pred_block(xd, yv12_mb[ref_frame], yv12, mi_row, mi_col, sf, sf);
@@ -2912,6 +2914,7 @@ void vp9_rd_pick_inter_mode_sb(VP9_COMP *cpi,
   for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ++ref_frame) {
     x->pred_mv_sad[ref_frame] = INT_MAX;
     if (cpi->ref_frame_flags & flag_list[ref_frame]) {
+      assert(get_ref_frame_buffer(cpi, ref_frame) != NULL);
       setup_buffer_inter(cpi, x, tile_info, ref_frame, bsize, mi_row, mi_col,
                          frame_mv[NEARESTMV], frame_mv[NEARMV], yv12_mb);
     }
@@ -4238,4 +4241,3 @@ void vp9_rd_pick_inter_mode_sub8x8(VP9_COMP *cpi,
   store_coding_context(x, ctx, best_ref_index,
                        best_pred_diff, best_tx_diff, best_filter_diff, 0);
 }
-
diff --git a/vp9/encoder/vp9_svc_layercontext.c b/vp9/encoder/vp9_svc_layercontext.c
index 161b5a24d..bf9cad00a 100644
--- a/vp9/encoder/vp9_svc_layercontext.c
+++ b/vp9/encoder/vp9_svc_layercontext.c
@@ -91,8 +91,8 @@ void vp9_init_layer_context(VP9_COMP *const cpi) {
       if (oxcf->ss_enable_auto_arf[layer])
         lc->alt_ref_idx = alt_ref_idx++;
       else
-        lc->alt_ref_idx = -1;
-      lc->gold_ref_idx = -1;
+        lc->alt_ref_idx = INVALID_IDX;
+      lc->gold_ref_idx = INVALID_IDX;
     }
 
     lrc->buffer_level = oxcf->starting_buffer_level_ms *