The Tor Browser: content/media/fmp4/demuxer/video_decoder

     1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.

     2 // Use of this source code is governed by a BSD-style license that can be

     3 // found in the LICENSE file.

     5 #include "mp4_demuxer/video_decoder_config.h"

     7 #include <sstream>

     8 #include <string.h>

    10 namespace mp4_demuxer {

    12 VideoDecoderConfig::VideoDecoderConfig()

    13     : codec_(kUnknownVideoCodec),

    14       profile_(VIDEO_CODEC_PROFILE_UNKNOWN),

    15       format_(VideoFrameFormat::INVALID),

    16       is_encrypted_(false) {

    17 }

    19 VideoDecoderConfig::VideoDecoderConfig(VideoCodec codec,

    20                                        VideoCodecProfile profile,

    21                                        VideoFrameFormat format,

    22                                        const IntSize& coded_size,

    23                                        const IntRect& visible_rect,

    24                                        const IntSize& natural_size,

    25                                        const uint8_t* extra_data,

    26                                        size_t extra_data_size,

    27                                        bool is_encrypted) {

    28   Initialize(codec, profile, format, coded_size, visible_rect, natural_size,

    29              extra_data, extra_data_size, is_encrypted, true);

    30 }

    32 VideoDecoderConfig::~VideoDecoderConfig() {}

    34 // Some videos just want to watch the world burn, with a height of 0; cap the

    35 // "infinite" aspect ratio resulting.

    36 static const int kInfiniteRatio = 99999;

    38 // Common aspect ratios (multiplied by 100 and truncated) used for histogramming

    39 // video sizes.  These were taken on 20111103 from

    40 // http://wikipedia.org/wiki/Aspect_ratio_(image)#Previous_and_currently_used_aspect_ratios

    41 static const int kCommonAspectRatios100[] = {

    42   100, 115, 133, 137, 143, 150, 155, 160, 166, 175, 177, 185, 200, 210, 220,

    43   221, 235, 237, 240, 255, 259, 266, 276, 293, 400, 1200, kInfiniteRatio,

    44 };

    46 void VideoDecoderConfig::Initialize(VideoCodec codec,

    47                                     VideoCodecProfile profile,

    48                                     VideoFrameFormat format,

    49                                     const IntSize& coded_size,

    50                                     const IntRect& visible_rect,

    51                                     const IntSize& natural_size,

    52                                     const uint8_t* extra_data,

    53                                     size_t extra_data_size,

    54                                     bool is_encrypted,

    55                                     bool record_stats) {

    56   CHECK((extra_data_size != 0) == (extra_data != NULL));

    58   codec_ = codec;

    59   profile_ = profile;

    60   format_ = format;

    61   coded_size_ = coded_size;

    62   visible_rect_ = visible_rect;

    63   natural_size_ = natural_size;

    64   extra_data_.assign(extra_data, extra_data + extra_data_size);

    65   is_encrypted_ = is_encrypted;

    66 }

    68 bool VideoDecoderConfig::IsValidConfig() const {

    69   return codec_ != kUnknownVideoCodec &&

    70       natural_size_.width() > 0 &&

    71       natural_size_.height() > 0 &&

    73       // Copied from:

    74       // VideoFrame::IsValidConfig(format_, coded_size_, visible_rect_, natural_size_)

    75       format_ != VideoFrameFormat::INVALID &&

    76       !coded_size_.IsEmpty() &&

    77       coded_size_.GetArea() <= kMaxCanvas &&

    78       coded_size_.width() <= kMaxDimension &&

    79       coded_size_.height() <= kMaxDimension &&

    80       !visible_rect_.IsEmpty() &&

    81       visible_rect_.x() >= 0 && visible_rect_.y() >= 0 &&

    82       visible_rect_.right() <= coded_size_.width() &&

    83       visible_rect_.bottom() <= coded_size_.height() &&

    84       !natural_size_.IsEmpty() &&

    85       natural_size_.GetArea() <= kMaxCanvas &&

    86       natural_size_.width() <= kMaxDimension &&

    87       natural_size_.height() <= kMaxDimension;

    88 }

    90 bool VideoDecoderConfig::Matches(const VideoDecoderConfig& config) const {

    91   return ((codec() == config.codec()) &&

    92           (format() == config.format()) &&

    93           (profile() == config.profile()) &&

    94           (coded_size() == config.coded_size()) &&

    95           (visible_rect() == config.visible_rect()) &&

    96           (natural_size() == config.natural_size()) &&

    97           (extra_data_size() == config.extra_data_size()) &&

    98           (!extra_data() || !memcmp(extra_data(), config.extra_data(),

    99                                     extra_data_size())) &&

   100           (is_encrypted() == config.is_encrypted()));

   101 }

   103 std::string VideoDecoderConfig::AsHumanReadableString() const {

   104   std::ostringstream s;

   105   s << "codec: " << codec()

   106     << " format: " << format()

   107     << " profile: " << profile()

   108     << " coded size: [" << coded_size().width()

   109     << "," << coded_size().height() << "]"

   110     << " visible rect: [" << visible_rect().x()

   111     << "," << visible_rect().y()

   112     << "," << visible_rect().width()

   113     << "," << visible_rect().height() << "]"

   114     << " natural size: [" << natural_size().width()

   115     << "," << natural_size().height() << "]"

   116     << " has extra data? " << (extra_data() ? "true" : "false")

   117     << " encrypted? " << (is_encrypted() ? "true" : "false");

   118   return s.str();

   119 }

   121 VideoCodec VideoDecoderConfig::codec() const {

   122   return codec_;

   123 }

   125 VideoCodecProfile VideoDecoderConfig::profile() const {

   126   return profile_;

   127 }

   129 VideoFrameFormat VideoDecoderConfig::format() const {

   130   return format_;

   131 }

   133 IntSize VideoDecoderConfig::coded_size() const {

   134   return coded_size_;

   135 }

   137 IntRect VideoDecoderConfig::visible_rect() const {

   138   return visible_rect_;

   139 }

   141 IntSize VideoDecoderConfig::natural_size() const {

   142   return natural_size_;

   143 }

   145 const uint8_t* VideoDecoderConfig::extra_data() const {

   146   if (extra_data_.empty())

   147     return NULL;

   148   return &extra_data_[0];

   149 }

   151 size_t VideoDecoderConfig::extra_data_size() const {

   152   return extra_data_.size();

   153 }

   155 bool VideoDecoderConfig::is_encrypted() const {

   156   return is_encrypted_;

   157 }

   159 }  // namespace mp4_demuxer

The Tor Browser / file revision