The Tor Browser: media/libvpx/vpx/src/vpx_encoder.c@ac0c01689b40 (annotated)

media/libvpx/vpx/src/vpx_encoder.c@ac0c01689b40 (annotated)

media/libvpx/vpx/src/vpx_encoder.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.
  */
 /*!\file
  * \brief Provides the high level interface to wrap encoder algorithms.
  *
  */
 #include <limits.h>
 #include <string.h>
 #include "vpx/internal/vpx_codec_internal.h"
 #include "vpx_config.h"
 #define SAVE_STATUS(ctx,var) (ctx?(ctx->err = var):var)
 vpx_codec_err_t vpx_codec_enc_init_ver(vpx_codec_ctx_t      *ctx,
                                        vpx_codec_iface_t    *iface,
                                        vpx_codec_enc_cfg_t  *cfg,
                                        vpx_codec_flags_t     flags,
                                        int                   ver) {
   vpx_codec_err_t res;
   if (ver != VPX_ENCODER_ABI_VERSION)
     res = VPX_CODEC_ABI_MISMATCH;
   else if (!ctx || !iface || !cfg)
     res = VPX_CODEC_INVALID_PARAM;
   else if (iface->abi_version != VPX_CODEC_INTERNAL_ABI_VERSION)
     res = VPX_CODEC_ABI_MISMATCH;
   else if (!(iface->caps & VPX_CODEC_CAP_ENCODER))
     res = VPX_CODEC_INCAPABLE;
   else if ((flags & VPX_CODEC_USE_XMA) && !(iface->caps & VPX_CODEC_CAP_XMA))
     res = VPX_CODEC_INCAPABLE;
   else if ((flags & VPX_CODEC_USE_PSNR)
            && !(iface->caps & VPX_CODEC_CAP_PSNR))
     res = VPX_CODEC_INCAPABLE;
   else if ((flags & VPX_CODEC_USE_OUTPUT_PARTITION)
            && !(iface->caps & VPX_CODEC_CAP_OUTPUT_PARTITION))
     res = VPX_CODEC_INCAPABLE;
   else {
     ctx->iface = iface;
     ctx->name = iface->name;
     ctx->priv = NULL;
     ctx->init_flags = flags;
     ctx->config.enc = cfg;
     res = ctx->iface->init(ctx, NULL);
     if (res) {
       ctx->err_detail = ctx->priv ? ctx->priv->err_detail : NULL;
       vpx_codec_destroy(ctx);
     }
     if (ctx->priv)
       ctx->priv->iface = ctx->iface;
   }
   return SAVE_STATUS(ctx, res);
 }
 vpx_codec_err_t vpx_codec_enc_init_multi_ver(vpx_codec_ctx_t      *ctx,
                                              vpx_codec_iface_t    *iface,
                                              vpx_codec_enc_cfg_t  *cfg,
                                              int                   num_enc,
                                              vpx_codec_flags_t     flags,
                                              vpx_rational_t       *dsf,
                                              int                   ver) {
   vpx_codec_err_t res = 0;
   if (ver != VPX_ENCODER_ABI_VERSION)
     res = VPX_CODEC_ABI_MISMATCH;
   else if (!ctx || !iface || !cfg || (num_enc > 16 || num_enc < 1))
     res = VPX_CODEC_INVALID_PARAM;
   else if (iface->abi_version != VPX_CODEC_INTERNAL_ABI_VERSION)
     res = VPX_CODEC_ABI_MISMATCH;
   else if (!(iface->caps & VPX_CODEC_CAP_ENCODER))
     res = VPX_CODEC_INCAPABLE;
   else if ((flags & VPX_CODEC_USE_XMA) && !(iface->caps & VPX_CODEC_CAP_XMA))
     res = VPX_CODEC_INCAPABLE;
   else if ((flags & VPX_CODEC_USE_PSNR)
            && !(iface->caps & VPX_CODEC_CAP_PSNR))
     res = VPX_CODEC_INCAPABLE;
   else if ((flags & VPX_CODEC_USE_OUTPUT_PARTITION)
            && !(iface->caps & VPX_CODEC_CAP_OUTPUT_PARTITION))
     res = VPX_CODEC_INCAPABLE;
   else {
     int i;
     void *mem_loc = NULL;
     if (!(res = iface->enc.mr_get_mem_loc(cfg, &mem_loc))) {
       for (i = 0; i < num_enc; i++) {
         vpx_codec_priv_enc_mr_cfg_t mr_cfg;
         /* Validate down-sampling factor. */
         if (dsf->num < 1 || dsf->num > 4096 || dsf->den < 1 ||
             dsf->den > dsf->num) {
           res = VPX_CODEC_INVALID_PARAM;
           break;
         }
         mr_cfg.mr_low_res_mode_info = mem_loc;
         mr_cfg.mr_total_resolutions = num_enc;
         mr_cfg.mr_encoder_id = num_enc - 1 - i;
         mr_cfg.mr_down_sampling_factor.num = dsf->num;
         mr_cfg.mr_down_sampling_factor.den = dsf->den;
         /* Force Key-frame synchronization. Namely, encoder at higher
          * resolution always use the same frame_type chosen by the
          * lowest-resolution encoder.
          */
         if (mr_cfg.mr_encoder_id)
           cfg->kf_mode = VPX_KF_DISABLED;
         ctx->iface = iface;
         ctx->name = iface->name;
         ctx->priv = NULL;
         ctx->init_flags = flags;
         ctx->config.enc = cfg;
         res = ctx->iface->init(ctx, &mr_cfg);
         if (res) {
           const char *error_detail =
             ctx->priv ? ctx->priv->err_detail : NULL;
           /* Destroy current ctx */
           ctx->err_detail = error_detail;
           vpx_codec_destroy(ctx);
           /* Destroy already allocated high-level ctx */
           while (i) {
             ctx--;
             ctx->err_detail = error_detail;
             vpx_codec_destroy(ctx);
             i--;
           }
         }
         if (ctx->priv)
           ctx->priv->iface = ctx->iface;
         if (res)
           break;
         ctx++;
         cfg++;
         dsf++;
       }
     }
   }
   return SAVE_STATUS(ctx, res);
 }
 vpx_codec_err_t  vpx_codec_enc_config_default(vpx_codec_iface_t    *iface,
                                               vpx_codec_enc_cfg_t  *cfg,
                                               unsigned int          usage) {
   vpx_codec_err_t res;
   vpx_codec_enc_cfg_map_t *map;
   if (!iface || !cfg || usage > INT_MAX)
     res = VPX_CODEC_INVALID_PARAM;
   else if (!(iface->caps & VPX_CODEC_CAP_ENCODER))
     res = VPX_CODEC_INCAPABLE;
   else {
     res = VPX_CODEC_INVALID_PARAM;
     for (map = iface->enc.cfg_maps; map->usage >= 0; map++) {
       if (map->usage == (int)usage) {
         *cfg = map->cfg;
         cfg->g_usage = usage;
         res = VPX_CODEC_OK;
         break;
       }
     }
   }
   return res;
 }
 #if ARCH_X86 || ARCH_X86_64
 /* On X86, disable the x87 unit's internal 80 bit precision for better
  * consistency with the SSE unit's 64 bit precision.
  */
 #include "vpx_ports/x86.h"
 #define FLOATING_POINT_INIT() do {\
     unsigned short x87_orig_mode = x87_set_double_precision();
 #define FLOATING_POINT_RESTORE() \
   x87_set_control_word(x87_orig_mode); }while(0)
 #else
 static void FLOATING_POINT_INIT() {}
 static void FLOATING_POINT_RESTORE() {}
 #endif
 vpx_codec_err_t  vpx_codec_encode(vpx_codec_ctx_t            *ctx,
                                   const vpx_image_t          *img,
                                   vpx_codec_pts_t             pts,
                                   unsigned long               duration,
                                   vpx_enc_frame_flags_t       flags,
                                   unsigned long               deadline) {
   vpx_codec_err_t res = 0;
   if (!ctx || (img && !duration))
     res = VPX_CODEC_INVALID_PARAM;
   else if (!ctx->iface || !ctx->priv)
     res = VPX_CODEC_ERROR;
   else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
     res = VPX_CODEC_INCAPABLE;
   else {
     unsigned int num_enc = ctx->priv->enc.total_encoders;
     /* Execute in a normalized floating point environment, if the platform
      * requires it.
      */
     FLOATING_POINT_INIT();
     if (num_enc == 1)
       res = ctx->iface->enc.encode(ctx->priv->alg_priv, img, pts,
                                    duration, flags, deadline);
     else {
       /* Multi-resolution encoding:
        * Encode multi-levels in reverse order. For example,
        * if mr_total_resolutions = 3, first encode level 2,
        * then encode level 1, and finally encode level 0.
        */
       int i;
       ctx += num_enc - 1;
       if (img) img += num_enc - 1;
       for (i = num_enc - 1; i >= 0; i--) {
         if ((res = ctx->iface->enc.encode(ctx->priv->alg_priv, img, pts,
                                           duration, flags, deadline)))
           break;
         ctx--;
         if (img) img--;
       }
       ctx++;
     }
     FLOATING_POINT_RESTORE();
   }
   return SAVE_STATUS(ctx, res);
 }
 const vpx_codec_cx_pkt_t *vpx_codec_get_cx_data(vpx_codec_ctx_t   *ctx,
                                                 vpx_codec_iter_t  *iter) {
   const vpx_codec_cx_pkt_t *pkt = NULL;
   if (ctx) {
     if (!iter)
       ctx->err = VPX_CODEC_INVALID_PARAM;
     else if (!ctx->iface || !ctx->priv)
       ctx->err = VPX_CODEC_ERROR;
     else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
       ctx->err = VPX_CODEC_INCAPABLE;
     else
       pkt = ctx->iface->enc.get_cx_data(ctx->priv->alg_priv, iter);
   }
   if (pkt && pkt->kind == VPX_CODEC_CX_FRAME_PKT) {
     /* If the application has specified a destination area for the
      * compressed data, and the codec has not placed the data there,
      * and it fits, copy it.
      */
     char *dst_buf = ctx->priv->enc.cx_data_dst_buf.buf;
     if (dst_buf
         && pkt->data.raw.buf != dst_buf
         && pkt->data.raw.sz
         + ctx->priv->enc.cx_data_pad_before
         + ctx->priv->enc.cx_data_pad_after
         <= ctx->priv->enc.cx_data_dst_buf.sz) {
       vpx_codec_cx_pkt_t *modified_pkt = &ctx->priv->enc.cx_data_pkt;
       memcpy(dst_buf + ctx->priv->enc.cx_data_pad_before,
              pkt->data.raw.buf, pkt->data.raw.sz);
       *modified_pkt = *pkt;
       modified_pkt->data.raw.buf = dst_buf;
       modified_pkt->data.raw.sz += ctx->priv->enc.cx_data_pad_before
                                    + ctx->priv->enc.cx_data_pad_after;
       pkt = modified_pkt;
     }
     if (dst_buf == pkt->data.raw.buf) {
       ctx->priv->enc.cx_data_dst_buf.buf = dst_buf + pkt->data.raw.sz;
       ctx->priv->enc.cx_data_dst_buf.sz -= pkt->data.raw.sz;
     }
   }
   return pkt;
 }
 vpx_codec_err_t vpx_codec_set_cx_data_buf(vpx_codec_ctx_t       *ctx,
                                           const vpx_fixed_buf_t *buf,
                                           unsigned int           pad_before,
                                           unsigned int           pad_after) {
   if (!ctx || !ctx->priv)
     return VPX_CODEC_INVALID_PARAM;
   if (buf) {
     ctx->priv->enc.cx_data_dst_buf = *buf;
     ctx->priv->enc.cx_data_pad_before = pad_before;
     ctx->priv->enc.cx_data_pad_after = pad_after;
   } else {
     ctx->priv->enc.cx_data_dst_buf.buf = NULL;
     ctx->priv->enc.cx_data_dst_buf.sz = 0;
     ctx->priv->enc.cx_data_pad_before = 0;
     ctx->priv->enc.cx_data_pad_after = 0;
   }
   return VPX_CODEC_OK;
 }
 const vpx_image_t *vpx_codec_get_preview_frame(vpx_codec_ctx_t   *ctx) {
   vpx_image_t *img = NULL;
   if (ctx) {
     if (!ctx->iface || !ctx->priv)
       ctx->err = VPX_CODEC_ERROR;
     else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
       ctx->err = VPX_CODEC_INCAPABLE;
     else if (!ctx->iface->enc.get_preview)
       ctx->err = VPX_CODEC_INCAPABLE;
     else
       img = ctx->iface->enc.get_preview(ctx->priv->alg_priv);
   }
   return img;
 }
 vpx_fixed_buf_t *vpx_codec_get_global_headers(vpx_codec_ctx_t   *ctx) {
   vpx_fixed_buf_t *buf = NULL;
   if (ctx) {
     if (!ctx->iface || !ctx->priv)
       ctx->err = VPX_CODEC_ERROR;
     else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
       ctx->err = VPX_CODEC_INCAPABLE;
     else if (!ctx->iface->enc.get_glob_hdrs)
       ctx->err = VPX_CODEC_INCAPABLE;
     else
       buf = ctx->iface->enc.get_glob_hdrs(ctx->priv->alg_priv);
   }
   return buf;
 }
 vpx_codec_err_t  vpx_codec_enc_config_set(vpx_codec_ctx_t            *ctx,
                                           const vpx_codec_enc_cfg_t  *cfg) {
   vpx_codec_err_t res;
   if (!ctx || !ctx->iface || !ctx->priv || !cfg)
     res = VPX_CODEC_INVALID_PARAM;
   else if (!(ctx->iface->caps & VPX_CODEC_CAP_ENCODER))
     res = VPX_CODEC_INCAPABLE;
   else
     res = ctx->iface->enc.cfg_set(ctx->priv->alg_priv, cfg);
   return SAVE_STATUS(ctx, res);
 }
 int vpx_codec_pkt_list_add(struct vpx_codec_pkt_list *list,
                            const struct vpx_codec_cx_pkt *pkt) {
   if (list->cnt < list->max) {
     list->pkts[list->cnt++] = *pkt;
     return 0;
   }
   return 1;
 }
 const vpx_codec_cx_pkt_t *vpx_codec_pkt_list_get(struct vpx_codec_pkt_list *list,
                                                  vpx_codec_iter_t           *iter) {
   const vpx_codec_cx_pkt_t *pkt;
   if (!(*iter)) {
     *iter = list->pkts;
   }
   pkt = (const void *) * iter;
   if ((size_t)(pkt - list->pkts) < list->cnt)
     *iter = pkt + 1;
   else
     pkt = NULL;
   return pkt;
 }

The Tor Browser / annotate

media/libvpx/vpx/src/vpx_encoder.c@ac0c01689b40 (annotated)

media/libvpx/vpx/src/vpx_encoder.c