The Tor Browser: media/libvpx/vp9/encoder/vp9

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /*

     2  *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.

     3  *

     4  *  Use of this source code is governed by a BSD-style license

     5  *  that can be found in the LICENSE file in the root of the source

     6  *  tree. An additional intellectual property rights grant can be found

     7  *  in the file PATENTS.  All contributing project authors may

     8  *  be found in the AUTHORS file in the root of the source tree.

     9  */

    11 #include <math.h>

    13 #include "vp9/encoder/vp9_vaq.h"

    15 #include "vp9/common/vp9_seg_common.h"

    17 #include "vp9/encoder/vp9_ratectrl.h"

    18 #include "vp9/encoder/vp9_rdopt.h"

    19 #include "vp9/encoder/vp9_segmentation.h"

    20 #include "vp9/common/vp9_systemdependent.h"

    22 #define ENERGY_MIN (-3)

    23 #define ENERGY_MAX (3)

    24 #define ENERGY_SPAN (ENERGY_MAX - ENERGY_MIN +  1)

    25 #define ENERGY_IN_BOUNDS(energy)\

    26   assert((energy) >= ENERGY_MIN && (energy) <= ENERGY_MAX)

    28 static double q_ratio[MAX_SEGMENTS] = { 1, 1, 1, 1, 1, 1, 1, 1 };

    29 static double rdmult_ratio[MAX_SEGMENTS] = { 1, 1, 1, 1, 1, 1, 1, 1 };

    30 static int segment_id[MAX_SEGMENTS] = { 5, 3, 1, 0, 2, 4, 6, 7 };

    32 #define Q_RATIO(i) q_ratio[(i) - ENERGY_MIN]

    33 #define RDMULT_RATIO(i) rdmult_ratio[(i) - ENERGY_MIN]

    34 #define SEGMENT_ID(i) segment_id[(i) - ENERGY_MIN]

    36 DECLARE_ALIGNED(16, static const uint8_t, vp9_64_zeros[64]) = {0};

    38 unsigned int vp9_vaq_segment_id(int energy) {

    39   ENERGY_IN_BOUNDS(energy);

    41   return SEGMENT_ID(energy);

    42 }

    44 double vp9_vaq_rdmult_ratio(int energy) {

    45   ENERGY_IN_BOUNDS(energy);

    47   vp9_clear_system_state();  // __asm emms;

    49   return RDMULT_RATIO(energy);

    50 }

    52 double vp9_vaq_inv_q_ratio(int energy) {

    53   ENERGY_IN_BOUNDS(energy);

    55   vp9_clear_system_state();  // __asm emms;

    57   return Q_RATIO(-energy);

    58 }

    60 void vp9_vaq_init() {

    61   int i;

    62   double base_ratio;

    64   assert(ENERGY_SPAN <= MAX_SEGMENTS);

    66   vp9_clear_system_state();  // __asm emms;

    68   base_ratio = 1.8;

    70   for (i = ENERGY_MIN; i <= ENERGY_MAX; i++) {

    71     Q_RATIO(i) = pow(base_ratio, i/3.0);

    72   }

    73 }

    75 void vp9_vaq_frame_setup(VP9_COMP *cpi) {

    76   VP9_COMMON *cm = &cpi->common;

    77   struct segmentation *seg = &cm->seg;

    78   int base_q = vp9_convert_qindex_to_q(cm->base_qindex);

    79   int base_rdmult = vp9_compute_rd_mult(cpi, cm->base_qindex +

    80                                         cm->y_dc_delta_q);

    81   int i;

    83   vp9_enable_segmentation((VP9_PTR)cpi);

    84   vp9_clearall_segfeatures(seg);

    86   seg->abs_delta = SEGMENT_DELTADATA;

    88   vp9_clear_system_state();  // __asm emms;

    90   for (i = ENERGY_MIN; i <= ENERGY_MAX; i++) {

    91     int qindex_delta, segment_rdmult;

    93     if (Q_RATIO(i) == 1) {

    94       // No need to enable SEG_LVL_ALT_Q for this segment

    95       RDMULT_RATIO(i) = 1;

    96       continue;

    97     }

    99     qindex_delta = vp9_compute_qdelta(cpi, base_q, base_q * Q_RATIO(i));

   100     vp9_set_segdata(seg, SEGMENT_ID(i), SEG_LVL_ALT_Q, qindex_delta);

   101     vp9_enable_segfeature(seg, SEGMENT_ID(i), SEG_LVL_ALT_Q);

   103     segment_rdmult = vp9_compute_rd_mult(cpi, cm->base_qindex + qindex_delta +

   104                                          cm->y_dc_delta_q);

   106     RDMULT_RATIO(i) = (double) segment_rdmult / base_rdmult;

   107   }

   108 }

   111 static unsigned int block_variance(VP9_COMP *cpi, MACROBLOCK *x,

   112                                    BLOCK_SIZE bs) {

   113   MACROBLOCKD *xd = &x->e_mbd;

   114   unsigned int var, sse;

   115   int right_overflow = (xd->mb_to_right_edge < 0) ?

   116       ((-xd->mb_to_right_edge) >> 3) : 0;

   117   int bottom_overflow = (xd->mb_to_bottom_edge < 0) ?

   118       ((-xd->mb_to_bottom_edge) >> 3) : 0;

   120   if (right_overflow || bottom_overflow) {

   121     const int bw = 8 * num_8x8_blocks_wide_lookup[bs] - right_overflow;

   122     const int bh = 8 * num_8x8_blocks_high_lookup[bs] - bottom_overflow;

   123     int avg;

   124     variance(x->plane[0].src.buf, x->plane[0].src.stride,

   125              vp9_64_zeros, 0, bw, bh, &sse, &avg);

   126     var = sse - (((int64_t)avg * avg) / (bw * bh));

   127     return (256 * var) / (bw * bh);

   128   } else {

   129     var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf,

   130                              x->plane[0].src.stride,

   131                              vp9_64_zeros, 0, &sse);

   132     return (256 * var) >> num_pels_log2_lookup[bs];

   133   }

   134 }

   136 int vp9_block_energy(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {

   137   double energy;

   138   unsigned int var = block_variance(cpi, x, bs);

   140   vp9_clear_system_state();  // __asm emms;

   142   // if (var <= 1000)

   143   //   return 0;

   145   energy = 0.9*(logf(var + 1) - 10.0);

   146   return clamp(round(energy), ENERGY_MIN, ENERGY_MAX);

   147 }

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