The Tor Browser: media/libvpx/vp9/decoder/vp9_onyxd

media/libvpx/vp9/decoder/vp9_onyxd_if.c@ac0c01689b40 (annotated)

media/libvpx/vp9/decoder/vp9_onyxd_if.c

Thu, 15 Jan 2015 15:59:08 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:59:08 +0100
branch: TOR_BUG_9701
changeset 10: ac0c01689b40
permissions: -rw-r--r--

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.

 /*
  *  Copyright (c) 2010 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 <assert.h>
 #include <limits.h>
 #include <stdio.h>
 #include "vp9/common/vp9_onyxc_int.h"
 #if CONFIG_VP9_POSTPROC
 #include "vp9/common/vp9_postproc.h"
 #endif
 #include "vp9/decoder/vp9_onyxd.h"
 #include "vp9/decoder/vp9_onyxd_int.h"
 #include "vpx_mem/vpx_mem.h"
 #include "vp9/common/vp9_alloccommon.h"
 #include "vp9/common/vp9_loopfilter.h"
 #include "vp9/common/vp9_quant_common.h"
 #include "vpx_scale/vpx_scale.h"
 #include "vp9/common/vp9_systemdependent.h"
 #include "vpx_ports/vpx_timer.h"
 #include "vp9/decoder/vp9_decodframe.h"
 #include "vp9/decoder/vp9_detokenize.h"
 #include "./vpx_scale_rtcd.h"
 #define WRITE_RECON_BUFFER 0
 #if WRITE_RECON_BUFFER == 1
 static void recon_write_yuv_frame(const char *name,
                                   const YV12_BUFFER_CONFIG *s,
                                   int w, int _h) {
   FILE *yuv_file = fopen(name, "ab");
   const uint8_t *src = s->y_buffer;
   int h = _h;
   do {
     fwrite(src, w, 1,  yuv_file);
     src += s->y_stride;
   } while (--h);
   src = s->u_buffer;
   h = (_h + 1) >> 1;
   w = (w + 1) >> 1;
   do {
     fwrite(src, w, 1,  yuv_file);
     src += s->uv_stride;
   } while (--h);
   src = s->v_buffer;
   h = (_h + 1) >> 1;
   do {
     fwrite(src, w, 1, yuv_file);
     src += s->uv_stride;
   } while (--h);
   fclose(yuv_file);
 }
 #endif
 #if WRITE_RECON_BUFFER == 2
 void write_dx_frame_to_file(YV12_BUFFER_CONFIG *frame, int this_frame) {
   // write the frame
   FILE *yframe;
   int i;
   char filename[255];
   snprintf(filename, sizeof(filename)-1, "dx\\y%04d.raw", this_frame);
   yframe = fopen(filename, "wb");
   for (i = 0; i < frame->y_height; i++)
     fwrite(frame->y_buffer + i * frame->y_stride,
            frame->y_width, 1, yframe);
   fclose(yframe);
   snprintf(filename, sizeof(filename)-1, "dx\\u%04d.raw", this_frame);
   yframe = fopen(filename, "wb");
   for (i = 0; i < frame->uv_height; i++)
     fwrite(frame->u_buffer + i * frame->uv_stride,
            frame->uv_width, 1, yframe);
   fclose(yframe);
   snprintf(filename, sizeof(filename)-1, "dx\\v%04d.raw", this_frame);
   yframe = fopen(filename, "wb");
   for (i = 0; i < frame->uv_height; i++)
     fwrite(frame->v_buffer + i * frame->uv_stride,
            frame->uv_width, 1, yframe);
   fclose(yframe);
 }
 #endif
 void vp9_initialize_dec() {
   static int init_done = 0;
   if (!init_done) {
     vp9_initialize_common();
     vp9_init_quant_tables();
     init_done = 1;
   }
 }
 static void init_macroblockd(VP9D_COMP *const pbi) {
   MACROBLOCKD *xd = &pbi->mb;
   struct macroblockd_plane *const pd = xd->plane;
   int i;
   for (i = 0; i < MAX_MB_PLANE; ++i) {
     pd[i].qcoeff  = pbi->qcoeff[i];
     pd[i].dqcoeff = pbi->dqcoeff[i];
     pd[i].eobs    = pbi->eobs[i];
   }
 }
 VP9D_PTR vp9_create_decompressor(VP9D_CONFIG *oxcf) {
   VP9D_COMP *const pbi = vpx_memalign(32, sizeof(VP9D_COMP));
   VP9_COMMON *const cm = pbi ? &pbi->common : NULL;
   if (!cm)
     return NULL;
   vp9_zero(*pbi);
   if (setjmp(cm->error.jmp)) {
     cm->error.setjmp = 0;
     vp9_remove_decompressor(pbi);
     return NULL;
   }
   cm->error.setjmp = 1;
   vp9_initialize_dec();
   vp9_create_common(cm);
   pbi->oxcf = *oxcf;
   pbi->ready_for_new_data = 1;
   cm->current_video_frame = 0;
   // vp9_init_dequantizer() is first called here. Add check in
   // frame_init_dequantizer() to avoid unnecessary calling of
   // vp9_init_dequantizer() for every frame.
   vp9_init_dequantizer(cm);
   vp9_loop_filter_init(cm);
   cm->error.setjmp = 0;
   pbi->decoded_key_frame = 0;
   init_macroblockd(pbi);
   vp9_worker_init(&pbi->lf_worker);
   return pbi;
 }
 void vp9_remove_decompressor(VP9D_PTR ptr) {
   int i;
   VP9D_COMP *const pbi = (VP9D_COMP *)ptr;
   if (!pbi)
     return;
   vp9_remove_common(&pbi->common);
   vp9_worker_end(&pbi->lf_worker);
   vpx_free(pbi->lf_worker.data1);
   for (i = 0; i < pbi->num_tile_workers; ++i) {
     VP9Worker *const worker = &pbi->tile_workers[i];
     vp9_worker_end(worker);
     vpx_free(worker->data1);
     vpx_free(worker->data2);
   }
   vpx_free(pbi->tile_workers);
   vpx_free(pbi->mi_streams);
   vpx_free(pbi->above_context[0]);
   vpx_free(pbi->above_seg_context);
   vpx_free(pbi);
 }
 static int equal_dimensions(YV12_BUFFER_CONFIG *a, YV12_BUFFER_CONFIG *b) {
     return a->y_height == b->y_height && a->y_width == b->y_width &&
            a->uv_height == b->uv_height && a->uv_width == b->uv_width;
 }
 vpx_codec_err_t vp9_copy_reference_dec(VP9D_PTR ptr,
                                        VP9_REFFRAME ref_frame_flag,
                                        YV12_BUFFER_CONFIG *sd) {
   VP9D_COMP *pbi = (VP9D_COMP *) ptr;
   VP9_COMMON *cm = &pbi->common;
   /* TODO(jkoleszar): The decoder doesn't have any real knowledge of what the
    * encoder is using the frame buffers for. This is just a stub to keep the
    * vpxenc --test-decode functionality working, and will be replaced in a
    * later commit that adds VP9-specific controls for this functionality.
    */
   if (ref_frame_flag == VP9_LAST_FLAG) {
     YV12_BUFFER_CONFIG *cfg = &cm->yv12_fb[cm->ref_frame_map[0]];
     if (!equal_dimensions(cfg, sd))
       vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
                          "Incorrect buffer dimensions");
     else
       vp8_yv12_copy_frame(cfg, sd);
   } else {
     vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
                        "Invalid reference frame");
   }
   return cm->error.error_code;
 }
 vpx_codec_err_t vp9_set_reference_dec(VP9D_PTR ptr, VP9_REFFRAME ref_frame_flag,
                                       YV12_BUFFER_CONFIG *sd) {
   VP9D_COMP *pbi = (VP9D_COMP *) ptr;
   VP9_COMMON *cm = &pbi->common;
   int *ref_fb_ptr = NULL;
   /* TODO(jkoleszar): The decoder doesn't have any real knowledge of what the
    * encoder is using the frame buffers for. This is just a stub to keep the
    * vpxenc --test-decode functionality working, and will be replaced in a
    * later commit that adds VP9-specific controls for this functionality.
    */
   if (ref_frame_flag == VP9_LAST_FLAG) {
     ref_fb_ptr = &pbi->common.active_ref_idx[0];
   } else if (ref_frame_flag == VP9_GOLD_FLAG) {
     ref_fb_ptr = &pbi->common.active_ref_idx[1];
   } else if (ref_frame_flag == VP9_ALT_FLAG) {
     ref_fb_ptr = &pbi->common.active_ref_idx[2];
   } else {
     vpx_internal_error(&pbi->common.error, VPX_CODEC_ERROR,
                        "Invalid reference frame");
     return pbi->common.error.error_code;
   }
   if (!equal_dimensions(&cm->yv12_fb[*ref_fb_ptr], sd)) {
     vpx_internal_error(&pbi->common.error, VPX_CODEC_ERROR,
                        "Incorrect buffer dimensions");
   } else {
     // Find an empty frame buffer.
     const int free_fb = get_free_fb(cm);
     // Decrease fb_idx_ref_cnt since it will be increased again in
     // ref_cnt_fb() below.
     cm->fb_idx_ref_cnt[free_fb]--;
     // Manage the reference counters and copy image.
     ref_cnt_fb(cm->fb_idx_ref_cnt, ref_fb_ptr, free_fb);
     vp8_yv12_copy_frame(sd, &cm->yv12_fb[*ref_fb_ptr]);
   }
   return pbi->common.error.error_code;
 }
 int vp9_get_reference_dec(VP9D_PTR ptr, int index, YV12_BUFFER_CONFIG **fb) {
   VP9D_COMP *pbi = (VP9D_COMP *) ptr;
   VP9_COMMON *cm = &pbi->common;
   if (index < 0 || index >= NUM_REF_FRAMES)
     return -1;
   *fb = &cm->yv12_fb[cm->ref_frame_map[index]];
   return 0;
 }
 /* If any buffer updating is signaled it should be done here. */
 static void swap_frame_buffers(VP9D_COMP *pbi) {
   int ref_index = 0, mask;
   VP9_COMMON *const cm = &pbi->common;
   for (mask = pbi->refresh_frame_flags; mask; mask >>= 1) {
     if (mask & 1)
       ref_cnt_fb(cm->fb_idx_ref_cnt, &cm->ref_frame_map[ref_index],
                  cm->new_fb_idx);
     ++ref_index;
   }
   cm->frame_to_show = get_frame_new_buffer(cm);
   cm->fb_idx_ref_cnt[cm->new_fb_idx]--;
   // Invalidate these references until the next frame starts.
   for (ref_index = 0; ref_index < 3; ref_index++)
     cm->active_ref_idx[ref_index] = INT_MAX;
 }
 int vp9_receive_compressed_data(VP9D_PTR ptr,
                                 size_t size, const uint8_t **psource,
                                 int64_t time_stamp) {
   VP9D_COMP *pbi = (VP9D_COMP *) ptr;
   VP9_COMMON *cm = &pbi->common;
   const uint8_t *source = *psource;
   int retcode = 0;
   /*if(pbi->ready_for_new_data == 0)
       return -1;*/
   if (ptr == 0)
     return -1;
   cm->error.error_code = VPX_CODEC_OK;
   pbi->source = source;
   pbi->source_sz = size;
   if (pbi->source_sz == 0) {
     /* This is used to signal that we are missing frames.
      * We do not know if the missing frame(s) was supposed to update
      * any of the reference buffers, but we act conservative and
      * mark only the last buffer as corrupted.
      *
      * TODO(jkoleszar): Error concealment is undefined and non-normative
      * at this point, but if it becomes so, [0] may not always be the correct
      * thing to do here.
      */
     if (cm->active_ref_idx[0] != INT_MAX)
       get_frame_ref_buffer(cm, 0)->corrupted = 1;
   }
   cm->new_fb_idx = get_free_fb(cm);
   if (setjmp(cm->error.jmp)) {
     cm->error.setjmp = 0;
     /* We do not know if the missing frame(s) was supposed to update
      * any of the reference buffers, but we act conservative and
      * mark only the last buffer as corrupted.
      *
      * TODO(jkoleszar): Error concealment is undefined and non-normative
      * at this point, but if it becomes so, [0] may not always be the correct
      * thing to do here.
      */
     if (cm->active_ref_idx[0] != INT_MAX)
       get_frame_ref_buffer(cm, 0)->corrupted = 1;
     if (cm->fb_idx_ref_cnt[cm->new_fb_idx] > 0)
       cm->fb_idx_ref_cnt[cm->new_fb_idx]--;
     return -1;
   }
   cm->error.setjmp = 1;
   retcode = vp9_decode_frame(pbi, psource);
   if (retcode < 0) {
     cm->error.error_code = VPX_CODEC_ERROR;
     cm->error.setjmp = 0;
     if (cm->fb_idx_ref_cnt[cm->new_fb_idx] > 0)
       cm->fb_idx_ref_cnt[cm->new_fb_idx]--;
     return retcode;
   }
   swap_frame_buffers(pbi);
 #if WRITE_RECON_BUFFER == 2
   if (cm->show_frame)
     write_dx_frame_to_file(cm->frame_to_show,
                            cm->current_video_frame);
   else
     write_dx_frame_to_file(cm->frame_to_show,
                            cm->current_video_frame + 1000);
 #endif
   if (!pbi->do_loopfilter_inline) {
     vp9_loop_filter_frame(cm, &pbi->mb, pbi->common.lf.filter_level, 0, 0);
   }
 #if WRITE_RECON_BUFFER == 2
   if (cm->show_frame)
     write_dx_frame_to_file(cm->frame_to_show,
                            cm->current_video_frame + 2000);
   else
     write_dx_frame_to_file(cm->frame_to_show,
                            cm->current_video_frame + 3000);
 #endif
   vp9_extend_frame_inner_borders(cm->frame_to_show,
                                  cm->subsampling_x,
                                  cm->subsampling_y);
 #if WRITE_RECON_BUFFER == 1
   if (cm->show_frame)
     recon_write_yuv_frame("recon.yuv", cm->frame_to_show,
                           cm->width, cm->height);
 #endif
   vp9_clear_system_state();
   cm->last_show_frame = cm->show_frame;
   if (cm->show_frame) {
     // current mip will be the prev_mip for the next frame
     MODE_INFO *temp = cm->prev_mip;
     MODE_INFO **temp2 = cm->prev_mi_grid_base;
     cm->prev_mip = cm->mip;
     cm->mip = temp;
     cm->prev_mi_grid_base = cm->mi_grid_base;
     cm->mi_grid_base = temp2;
     // update the upper left visible macroblock ptrs
     cm->mi = cm->mip + cm->mode_info_stride + 1;
     cm->prev_mi = cm->prev_mip + cm->mode_info_stride + 1;
     cm->mi_grid_visible = cm->mi_grid_base + cm->mode_info_stride + 1;
     cm->prev_mi_grid_visible = cm->prev_mi_grid_base + cm->mode_info_stride + 1;
     pbi->mb.mi_8x8 = cm->mi_grid_visible;
     pbi->mb.mi_8x8[0] = cm->mi;
     cm->current_video_frame++;
   }
   pbi->ready_for_new_data = 0;
   pbi->last_time_stamp = time_stamp;
   pbi->source_sz = 0;
   cm->error.setjmp = 0;
   return retcode;
 }
 int vp9_get_raw_frame(VP9D_PTR ptr, YV12_BUFFER_CONFIG *sd,
                       int64_t *time_stamp, int64_t *time_end_stamp,
                       vp9_ppflags_t *flags) {
   int ret = -1;
   VP9D_COMP *pbi = (VP9D_COMP *) ptr;
   if (pbi->ready_for_new_data == 1)
     return ret;
   /* ie no raw frame to show!!! */
   if (pbi->common.show_frame == 0)
     return ret;
   pbi->ready_for_new_data = 1;
   *time_stamp = pbi->last_time_stamp;
   *time_end_stamp = 0;
 #if CONFIG_VP9_POSTPROC
   ret = vp9_post_proc_frame(&pbi->common, sd, flags);
 #else
   if (pbi->common.frame_to_show) {
     *sd = *pbi->common.frame_to_show;
     sd->y_width = pbi->common.width;
     sd->y_height = pbi->common.height;
     sd->uv_width = sd->y_width >> pbi->common.subsampling_x;
     sd->uv_height = sd->y_height >> pbi->common.subsampling_y;
     ret = 0;
   } else {
     ret = -1;
   }
 #endif /*!CONFIG_POSTPROC*/
   vp9_clear_system_state();
   return ret;
 }

The Tor Browser / annotate

media/libvpx/vp9/decoder/vp9_onyxd_if.c@ac0c01689b40 (annotated)

media/libvpx/vp9/decoder/vp9_onyxd_if.c