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

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /*

     2  *  Copyright (c) 2010 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  */

    12 #include "./vpx_config.h"

    13 #include "vpx_mem/vpx_mem.h"

    15 #include "vp9/common/vp9_blockd.h"

    16 #include "vp9/common/vp9_entropymode.h"

    17 #include "vp9/common/vp9_entropymv.h"

    18 #include "vp9/common/vp9_findnearmv.h"

    19 #include "vp9/common/vp9_onyxc_int.h"

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

    22 void vp9_update_mode_info_border(VP9_COMMON *cm, MODE_INFO *mi) {

    23   const int stride = cm->mode_info_stride;

    24   int i;

    26   // Clear down top border row

    27   vpx_memset(mi, 0, sizeof(MODE_INFO) * stride);

    29   // Clear left border column

    30   for (i = 1; i < cm->mi_rows + 1; i++)

    31     vpx_memset(&mi[i * stride], 0, sizeof(MODE_INFO));

    32 }

    34 void vp9_free_frame_buffers(VP9_COMMON *cm) {

    35   int i;

    37   for (i = 0; i < NUM_YV12_BUFFERS; i++)

    38     vp9_free_frame_buffer(&cm->yv12_fb[i]);

    40   vp9_free_frame_buffer(&cm->post_proc_buffer);

    42   vpx_free(cm->mip);

    43   vpx_free(cm->prev_mip);

    44   vpx_free(cm->last_frame_seg_map);

    45   vpx_free(cm->mi_grid_base);

    46   vpx_free(cm->prev_mi_grid_base);

    48   cm->mip = NULL;

    49   cm->prev_mip = NULL;

    50   cm->last_frame_seg_map = NULL;

    51   cm->mi_grid_base = NULL;

    52   cm->prev_mi_grid_base = NULL;

    53 }

    55 static void set_mb_mi(VP9_COMMON *cm, int aligned_width, int aligned_height) {

    56   cm->mi_cols = aligned_width >> MI_SIZE_LOG2;

    57   cm->mi_rows = aligned_height >> MI_SIZE_LOG2;

    58   cm->mode_info_stride = cm->mi_cols + MI_BLOCK_SIZE;

    60   cm->mb_cols = (cm->mi_cols + 1) >> 1;

    61   cm->mb_rows = (cm->mi_rows + 1) >> 1;

    62   cm->MBs = cm->mb_rows * cm->mb_cols;

    63 }

    65 static void setup_mi(VP9_COMMON *cm) {

    66   cm->mi = cm->mip + cm->mode_info_stride + 1;

    67   cm->prev_mi = cm->prev_mip + cm->mode_info_stride + 1;

    68   cm->mi_grid_visible = cm->mi_grid_base + cm->mode_info_stride + 1;

    69   cm->prev_mi_grid_visible = cm->prev_mi_grid_base + cm->mode_info_stride + 1;

    71   vpx_memset(cm->mip, 0,

    72              cm->mode_info_stride * (cm->mi_rows + 1) * sizeof(MODE_INFO));

    74   vpx_memset(cm->mi_grid_base, 0,

    75              cm->mode_info_stride * (cm->mi_rows + 1) *

    76              sizeof(*cm->mi_grid_base));

    78   vp9_update_mode_info_border(cm, cm->mip);

    79   vp9_update_mode_info_border(cm, cm->prev_mip);

    80 }

    82 int vp9_resize_frame_buffers(VP9_COMMON *cm, int width, int height) {

    83   const int aligned_width = ALIGN_POWER_OF_TWO(width, MI_SIZE_LOG2);

    84   const int aligned_height = ALIGN_POWER_OF_TWO(height, MI_SIZE_LOG2);

    85   const int ss_x = cm->subsampling_x;

    86   const int ss_y = cm->subsampling_y;

    87   int mi_size;

    89   if (vp9_realloc_frame_buffer(&cm->post_proc_buffer, width, height, ss_x, ss_y,

    90                              VP9BORDERINPIXELS) < 0)

    91     goto fail;

    93   set_mb_mi(cm, aligned_width, aligned_height);

    95   // Allocation

    96   mi_size = cm->mode_info_stride * (cm->mi_rows + MI_BLOCK_SIZE);

    98   vpx_free(cm->mip);

    99   cm->mip = vpx_calloc(mi_size, sizeof(MODE_INFO));

   100   if (!cm->mip)

   101     goto fail;

   103   vpx_free(cm->prev_mip);

   104   cm->prev_mip = vpx_calloc(mi_size, sizeof(MODE_INFO));

   105   if (!cm->prev_mip)

   106     goto fail;

   108   vpx_free(cm->mi_grid_base);

   109   cm->mi_grid_base = vpx_calloc(mi_size, sizeof(*cm->mi_grid_base));

   110   if (!cm->mi_grid_base)

   111     goto fail;

   113   vpx_free(cm->prev_mi_grid_base);

   114   cm->prev_mi_grid_base = vpx_calloc(mi_size, sizeof(*cm->prev_mi_grid_base));

   115   if (!cm->prev_mi_grid_base)

   116     goto fail;

   118   setup_mi(cm);

   120   // Create the segmentation map structure and set to 0.

   121   vpx_free(cm->last_frame_seg_map);

   122   cm->last_frame_seg_map = vpx_calloc(cm->mi_rows * cm->mi_cols, 1);

   123   if (!cm->last_frame_seg_map)

   124     goto fail;

   126   return 0;

   128  fail:

   129   vp9_free_frame_buffers(cm);

   130   return 1;

   131 }

   133 int vp9_alloc_frame_buffers(VP9_COMMON *cm, int width, int height) {

   134   int i;

   136   const int aligned_width = ALIGN_POWER_OF_TWO(width, MI_SIZE_LOG2);

   137   const int aligned_height = ALIGN_POWER_OF_TWO(height, MI_SIZE_LOG2);

   138   const int ss_x = cm->subsampling_x;

   139   const int ss_y = cm->subsampling_y;

   140   int mi_size;

   142   vp9_free_frame_buffers(cm);

   144   for (i = 0; i < NUM_YV12_BUFFERS; i++) {

   145     cm->fb_idx_ref_cnt[i] = 0;

   146     if (vp9_alloc_frame_buffer(&cm->yv12_fb[i], width, height, ss_x, ss_y,

   147                                VP9BORDERINPIXELS) < 0)

   148       goto fail;

   149   }

   151   cm->new_fb_idx = NUM_YV12_BUFFERS - 1;

   152   cm->fb_idx_ref_cnt[cm->new_fb_idx] = 1;

   154   for (i = 0; i < ALLOWED_REFS_PER_FRAME; i++)

   155     cm->active_ref_idx[i] = i;

   157   for (i = 0; i < NUM_REF_FRAMES; i++) {

   158     cm->ref_frame_map[i] = i;

   159     cm->fb_idx_ref_cnt[i] = 1;

   160   }

   162   if (vp9_alloc_frame_buffer(&cm->post_proc_buffer, width, height, ss_x, ss_y,

   163                              VP9BORDERINPIXELS) < 0)

   164     goto fail;

   166   set_mb_mi(cm, aligned_width, aligned_height);

   168   // Allocation

   169   mi_size = cm->mode_info_stride * (cm->mi_rows + MI_BLOCK_SIZE);

   171   cm->mip = vpx_calloc(mi_size, sizeof(MODE_INFO));

   172   if (!cm->mip)

   173     goto fail;

   175   cm->prev_mip = vpx_calloc(mi_size, sizeof(MODE_INFO));

   176   if (!cm->prev_mip)

   177     goto fail;

   179   cm->mi_grid_base = vpx_calloc(mi_size, sizeof(*cm->mi_grid_base));

   180   if (!cm->mi_grid_base)

   181     goto fail;

   183   cm->prev_mi_grid_base = vpx_calloc(mi_size, sizeof(*cm->prev_mi_grid_base));

   184   if (!cm->prev_mi_grid_base)

   185     goto fail;

   187   setup_mi(cm);

   189   // Create the segmentation map structure and set to 0.

   190   cm->last_frame_seg_map = vpx_calloc(cm->mi_rows * cm->mi_cols, 1);

   191   if (!cm->last_frame_seg_map)

   192     goto fail;

   194   return 0;

   196  fail:

   197   vp9_free_frame_buffers(cm);

   198   return 1;

   199 }

   201 void vp9_create_common(VP9_COMMON *cm) {

   202   vp9_machine_specific_config(cm);

   204   cm->tx_mode = ONLY_4X4;

   205   cm->comp_pred_mode = HYBRID_PREDICTION;

   206 }

   208 void vp9_remove_common(VP9_COMMON *cm) {

   209   vp9_free_frame_buffers(cm);

   210 }

   212 void vp9_initialize_common() {

   213   vp9_init_neighbors();

   214   vp9_coef_tree_initialize();

   215   vp9_entropy_mode_init();

   216   vp9_entropy_mv_init();

   217 }

   219 void vp9_update_frame_size(VP9_COMMON *cm) {

   220   const int aligned_width = ALIGN_POWER_OF_TWO(cm->width, MI_SIZE_LOG2);

   221   const int aligned_height = ALIGN_POWER_OF_TWO(cm->height, MI_SIZE_LOG2);

   223   set_mb_mi(cm, aligned_width, aligned_height);

   224   setup_mi(cm);

   226   // Initialize the previous frame segment map to 0.

   227   if (cm->last_frame_seg_map)

   228     vpx_memset(cm->last_frame_seg_map, 0, cm->mi_rows * cm->mi_cols);

   229 }

The Tor Browser / file revision

media/libvpx/vp9/common/vp9_alloccommon.c@ac0c01689b40

media/libvpx/vp9/common/vp9_alloccommon.c