Merge "Adding an aq mode for 360 videos"

vp9/encoder/vp9_aq_360.c

+/*
+ *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <math.h>
+
+#include "vpx_ports/mem.h"
+#include "vpx_ports/system_state.h"
+
+#include "vp9/encoder/vp9_aq_variance.h"
+
+#include "vp9/common/vp9_seg_common.h"
+
+#include "vp9/encoder/vp9_ratectrl.h"
+#include "vp9/encoder/vp9_rd.h"
+#include "vp9/encoder/vp9_segmentation.h"
+
+#define ENERGY_MIN (-4)
+#define ENERGY_MAX (1)
+#define ENERGY_SPAN (ENERGY_MAX - ENERGY_MIN +  1)
+#define ENERGY_IN_BOUNDS(energy)\
+  assert((energy) >= ENERGY_MIN && (energy) <= ENERGY_MAX)
+
+static const double rate_ratio[MAX_SEGMENTS] =
+  {1.0, 0.75, 0.6, 0.5, 0.4, 0.3, 0.25};
+
+// Sets segment id 0 for the equatorial region, 1 for temperate region
+// and 2 for the polar regions
+unsigned int vp9_360aq_segment_id(int mi_row, int mi_rows) {
+  if (mi_row < mi_rows / 8 || mi_row > mi_rows - mi_rows / 8)
+    return 2;
+  else if (mi_row < mi_rows / 4 || mi_row > mi_rows - mi_rows / 4)
+    return 1;
+  else
+    return 0;
+}
+
+void vp9_360aq_frame_setup(VP9_COMP *cpi) {
+  VP9_COMMON *cm = &cpi->common;
+  struct segmentation *seg = &cm->seg;
+  int i;
+
+  if (frame_is_intra_only(cm) || cm->error_resilient_mode) {
+    vp9_enable_segmentation(seg);
+    vp9_clearall_segfeatures(seg);
+
+    seg->abs_delta = SEGMENT_DELTADATA;
+
+    vpx_clear_system_state();
+
+    for (i = 0; i < MAX_SEGMENTS; ++i) {
+      int qindex_delta =
+          vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex,
+                                     rate_ratio[i], cm->bit_depth);
+
+      // We don't allow qindex 0 in a segment if the base value is not 0.
+      // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
+      // Q delta is sometimes applied without going back around the rd loop.
+      // This could lead to an illegal combination of partition size and q.
+      if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
+        qindex_delta = -cm->base_qindex + 1;
+      }
+
+      // No need to enable SEG_LVL_ALT_Q for this segment.
+      if (rate_ratio[i] == 1.0) {
+        continue;
+      }
+
+      vp9_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
+      vp9_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
+    }
+  }
+}

vp9/encoder/vp9_aq_360.h

+/*
+ *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+#ifndef VP9_ENCODER_VP9_AQ_360_H_
+#define VP9_ENCODER_VP9_AQ_360_H_
+
+#include "vp9/encoder/vp9_encoder.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+unsigned int vp9_360aq_segment_id(int mi_row, int mi_rows);
+void vp9_360aq_frame_setup(VP9_COMP *cpi);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // VP9_ENCODER_VP9_AQ_VARIANCE_H_

vp9/encoder/vp9_encodeframe.c

@@ -33,6 +33,7 @@
 #include "vp9/common/vp9_seg_common.h"
 #include "vp9/common/vp9_tile_common.h"
 
+#include "vp9/encoder/vp9_aq_360.h"
 #include "vp9/encoder/vp9_aq_complexity.h"
 #include "vp9/encoder/vp9_aq_cyclicrefresh.h"
 #include "vp9/encoder/vp9_aq_variance.h"
@@ -221,7 +222,8 @@ static void set_offsets(VP9_COMP *cpi, const TileInfo *const tile,
 
   // Setup segment ID.
   if (seg->enabled) {
-    if (cpi->oxcf.aq_mode != VARIANCE_AQ) {
+    if (cpi->oxcf.aq_mode != VARIANCE_AQ &&
+        cpi->oxcf.aq_mode != EQUATOR360_AQ) {
       const uint8_t *const map = seg->update_map ? cpi->segmentation_map
                                                  : cm->last_frame_seg_map;
       mbmi->segment_id = get_segment_id(cm, map, bsize, mi_row, mi_col);
@@ -1263,6 +1265,15 @@ static void rd_pick_sb_modes(VP9_COMP *cpi,
       mbmi->segment_id = get_segment_id(cm, map, bsize, mi_row, mi_col);
     }
     x->rdmult = set_segment_rdmult(cpi, x, mbmi->segment_id);
+  } else if (aq_mode == EQUATOR360_AQ) {
+    if (cm->frame_type == KEY_FRAME) {
+      mbmi->segment_id = vp9_360aq_segment_id(mi_row, cm->mi_rows);
+    } else {
+      const uint8_t *const map = cm->seg.update_map ? cpi->segmentation_map
+                                                    : cm->last_frame_seg_map;
+      mbmi->segment_id = get_segment_id(cm, map, bsize, mi_row, mi_col);
+    }
+    x->rdmult = set_segment_rdmult(cpi, x, mbmi->segment_id);
   } else if (aq_mode == COMPLEXITY_AQ) {
     x->rdmult = set_segment_rdmult(cpi, x, mbmi->segment_id);
   } else if (aq_mode == CYCLIC_REFRESH_AQ) {
@@ -1719,7 +1730,8 @@ static void update_state_rt(VP9_COMP *cpi, ThreadData *td,
     // For in frame complexity AQ or variance AQ, copy segment_id from
     // segmentation_map.
     if (cpi->oxcf.aq_mode == COMPLEXITY_AQ ||
-        cpi->oxcf.aq_mode == VARIANCE_AQ ) {
+        cpi->oxcf.aq_mode == VARIANCE_AQ ||
+        cpi->oxcf.aq_mode == EQUATOR360_AQ) {
       const uint8_t *const map = seg->update_map ? cpi->segmentation_map
                                                  : cm->last_frame_seg_map;
       mbmi->segment_id = get_segment_id(cm, map, bsize, mi_row, mi_col);

vp9/encoder/vp9_encoder.c

@@ -36,6 +36,7 @@
 #include "vp9/common/vp9_reconintra.h"
 #include "vp9/common/vp9_tile_common.h"
 
+#include "vp9/encoder/vp9_aq_360.h"
 #include "vp9/encoder/vp9_aq_complexity.h"
 #include "vp9/encoder/vp9_aq_cyclicrefresh.h"
 #include "vp9/encoder/vp9_aq_variance.h"
@@ -3334,6 +3335,8 @@ static void encode_without_recode_loop(VP9_COMP *cpi,
   // exclusive.
   if (cpi->oxcf.aq_mode == VARIANCE_AQ) {
     vp9_vaq_frame_setup(cpi);
+  } else if (cpi->oxcf.aq_mode == EQUATOR360_AQ) {
+    vp9_360aq_frame_setup(cpi);
   } else if (cpi->oxcf.aq_mode == COMPLEXITY_AQ) {
     vp9_setup_in_frame_q_adj(cpi);
   } else if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ) {
@@ -3464,6 +3467,8 @@ static void encode_with_recode_loop(VP9_COMP *cpi,
     // exclusive.
     if (cpi->oxcf.aq_mode == VARIANCE_AQ) {
       vp9_vaq_frame_setup(cpi);
+    } else if (cpi->oxcf.aq_mode == EQUATOR360_AQ) {
+      vp9_360aq_frame_setup(cpi);
     } else if (cpi->oxcf.aq_mode == COMPLEXITY_AQ) {
       vp9_setup_in_frame_q_adj(cpi);
     }

vp9/encoder/vp9_encoder.h

@@ -112,6 +112,7 @@ typedef enum {
   VARIANCE_AQ = 1,
   COMPLEXITY_AQ = 2,
   CYCLIC_REFRESH_AQ = 3,
+  EQUATOR360_AQ = 4,
   AQ_MODE_COUNT  // This should always be the last member of the enum
 } AQ_MODE;
 

vp9/vp9cx.mk

@@ -75,6 +75,8 @@ VP9_CX_SRCS-yes += encoder/vp9_tokenize.c
 VP9_CX_SRCS-yes += encoder/vp9_treewriter.c
 VP9_CX_SRCS-yes += encoder/vp9_aq_variance.c
 VP9_CX_SRCS-yes += encoder/vp9_aq_variance.h
+VP9_CX_SRCS-yes += encoder/vp9_aq_360.c
+VP9_CX_SRCS-yes += encoder/vp9_aq_360.h
 VP9_CX_SRCS-yes += encoder/vp9_aq_cyclicrefresh.c
 VP9_CX_SRCS-yes += encoder/vp9_aq_cyclicrefresh.h
 VP9_CX_SRCS-yes += encoder/vp9_aq_complexity.c

vpxenc.c

@@ -388,7 +388,7 @@ static const arg_def_t frame_parallel_decoding = ARG_DEF(
 static const arg_def_t aq_mode = ARG_DEF(
     NULL, "aq-mode", 1,
     "Adaptive quantization mode (0: off (default), 1: variance 2: complexity, "
-    "3: cyclic refresh)");
+    "3: cyclic refresh, 4: equator360)");
 static const arg_def_t frame_periodic_boost = ARG_DEF(
     NULL, "frame-boost", 1,
     "Enable frame periodic boost (0: off (default), 1: on)");