tor-browser

The Tor Browser
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npy.cc (9641B)

      1 // Copyright (c) the JPEG XL Project Authors. All rights reserved.
      2 //
      3 // Use of this source code is governed by a BSD-style
      4 // license that can be found in the LICENSE file.
      5 
      6 #include "lib/extras/enc/npy.h"
      7 
      8 #include <jxl/types.h>
      9 
     10 #include <memory>
     11 #include <sstream>
     12 #include <string>
     13 #include <vector>
     14 
     15 #include "lib/extras/packed_image.h"
     16 #include "lib/jxl/base/common.h"
     17 
     18 namespace jxl {
     19 namespace extras {
     20 namespace {
     21 
     22 // JSON value writing
     23 
     24 class JSONField {
     25 public:
     26  virtual ~JSONField() = default;
     27  virtual void Write(std::ostream& o, uint32_t indent) const = 0;
     28 
     29 protected:
     30  JSONField() = default;
     31 };
     32 
     33 class JSONValue : public JSONField {
     34 public:
     35  template <typename T>
     36  explicit JSONValue(const T& value) : value_(std::to_string(value)) {}
     37 
     38  explicit JSONValue(const std::string& value) : value_("\"" + value + "\"") {}
     39 
     40  explicit JSONValue(bool value) : value_(value ? "true" : "false") {}
     41 
     42  void Write(std::ostream& o, uint32_t indent) const override { o << value_; }
     43 
     44 private:
     45  std::string value_;
     46 };
     47 
     48 class JSONDict : public JSONField {
     49 public:
     50  JSONDict() = default;
     51 
     52  template <typename T>
     53  T* AddEmpty(const std::string& key) {
     54    static_assert(std::is_convertible<T*, JSONField*>::value,
     55                  "T must be a JSONField");
     56    T* ret = new T();
     57    JSONField* field = static_cast<JSONField*>(ret);
     58    auto handle = std::unique_ptr<JSONField>(field);
     59    values_.emplace_back(key, std::move(handle));
     60    return ret;
     61  }
     62 
     63  template <typename T>
     64  void Add(const std::string& key, const T& value) {
     65    JSONField* field = static_cast<JSONField*>(new JSONValue(value));
     66    auto handle = std::unique_ptr<JSONField>(field);
     67    values_.emplace_back(key, std::move(handle));
     68  }
     69 
     70  void Write(std::ostream& o, uint32_t indent) const override {
     71    std::string indent_str(indent, ' ');
     72    o << "{";
     73    bool is_first = true;
     74    for (const auto& key_value : values_) {
     75      if (!is_first) {
     76        o << ",";
     77      }
     78      is_first = false;
     79      o << "\n" << indent_str << "  \"" << key_value.first << "\": ";
     80      key_value.second->Write(o, indent + 2);
     81    }
     82    if (!values_.empty()) {
     83      o << "\n" << indent_str;
     84    }
     85    o << "}";
     86  }
     87 
     88 private:
     89  // Dictionary with order.
     90  std::vector<std::pair<std::string, std::unique_ptr<JSONField>>> values_;
     91 };
     92 
     93 class JSONArray : public JSONField {
     94 public:
     95  JSONArray() = default;
     96 
     97  template <typename T>
     98  T* AddEmpty() {
     99    static_assert(std::is_convertible<T*, JSONField*>::value,
    100                  "T must be a JSONField");
    101    T* ret = new T();
    102    values_.emplace_back(ret);
    103    return ret;
    104  }
    105 
    106  template <typename T>
    107  void Add(const T& value) {
    108    values_.emplace_back(new JSONValue(value));
    109  }
    110 
    111  void Write(std::ostream& o, uint32_t indent) const override {
    112    std::string indent_str(indent, ' ');
    113    o << "[";
    114    bool is_first = true;
    115    for (const auto& value : values_) {
    116      if (!is_first) {
    117        o << ",";
    118      }
    119      is_first = false;
    120      o << "\n" << indent_str << "  ";
    121      value->Write(o, indent + 2);
    122    }
    123    if (!values_.empty()) {
    124      o << "\n" << indent_str;
    125    }
    126    o << "]";
    127  }
    128 
    129 private:
    130  std::vector<std::unique_ptr<JSONField>> values_;
    131 };
    132 
    133 void GenerateMetadata(const PackedPixelFile& ppf, std::vector<uint8_t>* out) {
    134  JSONDict meta;
    135  // Same order as in 18181-3 CD.
    136 
    137  // Frames.
    138  auto* meta_frames = meta.AddEmpty<JSONArray>("frames");
    139  for (size_t i = 0; i < ppf.frames.size(); i++) {
    140    auto* frame_i = meta_frames->AddEmpty<JSONDict>();
    141    if (ppf.info.have_animation) {
    142      frame_i->Add("duration",
    143                   JSONValue(ppf.frames[i].frame_info.duration * 1.0f *
    144                             ppf.info.animation.tps_denominator /
    145                             ppf.info.animation.tps_numerator));
    146    }
    147 
    148    frame_i->Add("name", JSONValue(ppf.frames[i].name));
    149 
    150    if (ppf.info.animation.have_timecodes) {
    151      frame_i->Add("timecode", JSONValue(ppf.frames[i].frame_info.timecode));
    152    }
    153  }
    154 
    155 #define METADATA(FIELD) meta.Add(#FIELD, ppf.info.FIELD)
    156 
    157  METADATA(intensity_target);
    158  METADATA(min_nits);
    159  METADATA(relative_to_max_display);
    160  METADATA(linear_below);
    161 
    162  if (ppf.info.have_preview) {
    163    meta.AddEmpty<JSONDict>("preview");
    164    // TODO(veluca): can we have duration/name/timecode here?
    165  }
    166 
    167  {
    168    auto* ectype = meta.AddEmpty<JSONArray>("extra_channel_type");
    169    auto* bps = meta.AddEmpty<JSONArray>("bits_per_sample");
    170    auto* ebps = meta.AddEmpty<JSONArray>("exp_bits_per_sample");
    171    bps->Add(ppf.info.bits_per_sample);
    172    ebps->Add(ppf.info.exponent_bits_per_sample);
    173    for (const auto& eci : ppf.extra_channels_info) {
    174      switch (eci.ec_info.type) {
    175        case JXL_CHANNEL_ALPHA: {
    176          ectype->Add(std::string("Alpha"));
    177          break;
    178        }
    179        case JXL_CHANNEL_DEPTH: {
    180          ectype->Add(std::string("Depth"));
    181          break;
    182        }
    183        case JXL_CHANNEL_SPOT_COLOR: {
    184          ectype->Add(std::string("SpotColor"));
    185          break;
    186        }
    187        case JXL_CHANNEL_SELECTION_MASK: {
    188          ectype->Add(std::string("SelectionMask"));
    189          break;
    190        }
    191        case JXL_CHANNEL_BLACK: {
    192          ectype->Add(std::string("Black"));
    193          break;
    194        }
    195        case JXL_CHANNEL_CFA: {
    196          ectype->Add(std::string("CFA"));
    197          break;
    198        }
    199        case JXL_CHANNEL_THERMAL: {
    200          ectype->Add(std::string("Thermal"));
    201          break;
    202        }
    203        default: {
    204          ectype->Add(std::string("UNKNOWN"));
    205          break;
    206        }
    207      }
    208      bps->Add(eci.ec_info.bits_per_sample);
    209      ebps->Add(eci.ec_info.exponent_bits_per_sample);
    210    }
    211  }
    212 
    213  std::ostringstream os;
    214  meta.Write(os, 0);
    215  out->resize(os.str().size());
    216  memcpy(out->data(), os.str().data(), os.str().size());
    217 }
    218 
    219 void Append(std::vector<uint8_t>* out, const void* data, size_t size) {
    220  size_t pos = out->size();
    221  out->resize(pos + size);
    222  memcpy(out->data() + pos, data, size);
    223 }
    224 
    225 void WriteNPYHeader(size_t xsize, size_t ysize, uint32_t num_channels,
    226                    size_t num_frames, std::vector<uint8_t>* out) {
    227  const uint8_t header[] = "\x93NUMPY\x01\x00";
    228  Append(out, header, 8);
    229  std::stringstream ss;
    230  ss << "{'descr': '<f4', 'fortran_order': False, 'shape': (" << num_frames
    231     << ", " << ysize << ", " << xsize << ", " << num_channels << "), }\n";
    232  // 16-bit little endian header length.
    233  uint8_t header_len[2] = {static_cast<uint8_t>(ss.str().size() % 256),
    234                           static_cast<uint8_t>(ss.str().size() / 256)};
    235  Append(out, header_len, 2);
    236  Append(out, ss.str().data(), ss.str().size());
    237 }
    238 
    239 bool WriteFrameToNPYArray(size_t xsize, size_t ysize, const PackedFrame& frame,
    240                          std::vector<uint8_t>* out) {
    241  const auto& color = frame.color;
    242  if (color.xsize != xsize || color.ysize != ysize) {
    243    return false;
    244  }
    245  for (const auto& ec : frame.extra_channels) {
    246    if (ec.xsize != xsize || ec.ysize != ysize) {
    247      return false;
    248    }
    249  }
    250  // interleave the samples from color and extra channels
    251  for (size_t y = 0; y < ysize; ++y) {
    252    for (size_t x = 0; x < xsize; ++x) {
    253      {
    254        size_t sample_size = color.pixel_stride();
    255        size_t offset = y * color.stride + x * sample_size;
    256        uint8_t* pixels = reinterpret_cast<uint8_t*>(color.pixels());
    257        JXL_ENSURE(offset + sample_size <= color.pixels_size);
    258        Append(out, pixels + offset, sample_size);
    259      }
    260      for (const auto& ec : frame.extra_channels) {
    261        size_t sample_size = ec.pixel_stride();
    262        size_t offset = y * ec.stride + x * sample_size;
    263        uint8_t* pixels = reinterpret_cast<uint8_t*>(ec.pixels());
    264        JXL_ENSURE(offset + sample_size <= ec.pixels_size);
    265        Append(out, pixels + offset, sample_size);
    266      }
    267    }
    268  }
    269  return true;
    270 }
    271 
    272 // Writes a PackedPixelFile as a numpy 4D ndarray in binary format.
    273 bool WriteNPYArray(const PackedPixelFile& ppf, std::vector<uint8_t>* out) {
    274  size_t xsize = ppf.info.xsize;
    275  size_t ysize = ppf.info.ysize;
    276  WriteNPYHeader(xsize, ysize,
    277                 ppf.info.num_color_channels + ppf.extra_channels_info.size(),
    278                 ppf.frames.size(), out);
    279  for (const auto& frame : ppf.frames) {
    280    if (!WriteFrameToNPYArray(xsize, ysize, frame, out)) {
    281      return false;
    282    }
    283  }
    284  return true;
    285 }
    286 
    287 class NumPyEncoder : public Encoder {
    288 public:
    289  Status Encode(const PackedPixelFile& ppf, EncodedImage* encoded_image,
    290                ThreadPool* pool) const override {
    291    JXL_RETURN_IF_ERROR(VerifyBasicInfo(ppf.info));
    292    GenerateMetadata(ppf, &encoded_image->metadata);
    293    encoded_image->bitstreams.emplace_back();
    294    if (!WriteNPYArray(ppf, &encoded_image->bitstreams.back())) {
    295      return false;
    296    }
    297    if (ppf.preview_frame) {
    298      size_t xsize = ppf.info.preview.xsize;
    299      size_t ysize = ppf.info.preview.ysize;
    300      WriteNPYHeader(xsize, ysize, ppf.info.num_color_channels, 1,
    301                     &encoded_image->preview_bitstream);
    302      if (!WriteFrameToNPYArray(xsize, ysize, *ppf.preview_frame,
    303                                &encoded_image->preview_bitstream)) {
    304        return false;
    305      }
    306    }
    307    return true;
    308  }
    309  std::vector<JxlPixelFormat> AcceptedFormats() const override {
    310    std::vector<JxlPixelFormat> formats;
    311    for (const uint32_t num_channels : {1, 3}) {
    312      formats.push_back(JxlPixelFormat{num_channels, JXL_TYPE_FLOAT,
    313                                       JXL_LITTLE_ENDIAN, /*align=*/0});
    314    }
    315    return formats;
    316  }
    317 };
    318 
    319 }  // namespace
    320 
    321 std::unique_ptr<Encoder> GetNumPyEncoder() {
    322  return jxl::make_unique<NumPyEncoder>();
    323 }
    324 
    325 }  // namespace extras
    326 }  // namespace jxl