media/base/video_decoder_config.cc

   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.
   4
   5 #include "media/base/video_decoder_config.h"
   6
   7 #include "base/logging.h"
   8 #include "base/metrics/histogram.h"
   9
  10 namespace media {
  11
  12 VideoDecoderConfig::VideoDecoderConfig()
  13     : codec_(kUnknownVideoCodec),
  14       profile_(VIDEO_CODEC_PROFILE_UNKNOWN),
  15       format_(VideoFrame::INVALID),
  16       is_encrypted_(false) {
  17 }
  18
  19 VideoDecoderConfig::VideoDecoderConfig(VideoCodec codec,
  20                                        VideoCodecProfile profile,
  21                                        VideoFrame::Format format,
  22                                        const gfx::Size& coded_size,
  23                                        const gfx::Rect& visible_rect,
  24                                        const gfx::Size& natural_size,
  25                                        const uint8* 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 }
  31
  32 VideoDecoderConfig::~VideoDecoderConfig() {}
  33
  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;
  37
  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 };
  45
  46 template<class T>  // T has int width() & height() methods.
  47 static void UmaHistogramAspectRatio(const char* name, const T& size) {
  48   UMA_HISTOGRAM_CUSTOM_ENUMERATION(
  49       name,
  50       // Intentionally use integer division to truncate the result.
  51       size.height() ? (size.width() * 100) / size.height() : kInfiniteRatio,
  52       base::CustomHistogram::ArrayToCustomRanges(
  53           kCommonAspectRatios100, arraysize(kCommonAspectRatios100)));
  54 }
  55
  56 void VideoDecoderConfig::Initialize(VideoCodec codec,
  57                                     VideoCodecProfile profile,
  58                                     VideoFrame::Format format,
  59                                     const gfx::Size& coded_size,
  60                                     const gfx::Rect& visible_rect,
  61                                     const gfx::Size& natural_size,
  62                                     const uint8* extra_data,
  63                                     size_t extra_data_size,
  64                                     bool is_encrypted,
  65                                     bool record_stats) {
  66   CHECK((extra_data_size != 0) == (extra_data != NULL));
  67
  68   if (record_stats) {
  69     UMA_HISTOGRAM_ENUMERATION("Media.VideoCodec", codec, kVideoCodecMax + 1);
  70     // Drop UNKNOWN because U_H_E() uses one bucket for all values less than 1.
  71     if (profile >= 0) {
  72       UMA_HISTOGRAM_ENUMERATION("Media.VideoCodecProfile", profile,
  73                                 VIDEO_CODEC_PROFILE_MAX + 1);
  74     }
  75     UMA_HISTOGRAM_COUNTS_10000("Media.VideoCodedWidth", coded_size.width());
  76     UmaHistogramAspectRatio("Media.VideoCodedAspectRatio", coded_size);
  77     UMA_HISTOGRAM_COUNTS_10000("Media.VideoVisibleWidth", visible_rect.width());
  78     UmaHistogramAspectRatio("Media.VideoVisibleAspectRatio", visible_rect);
  79   }
  80
  81   codec_ = codec;
  82   profile_ = profile;
  83   format_ = format;
  84   coded_size_ = coded_size;
  85   visible_rect_ = visible_rect;
  86   natural_size_ = natural_size;
  87   extra_data_.assign(extra_data, extra_data + extra_data_size);
  88   is_encrypted_ = is_encrypted;
  89 }
  90
  91 bool VideoDecoderConfig::IsValidConfig() const {
  92   return codec_ != kUnknownVideoCodec &&
  93       natural_size_.width() > 0 &&
  94       natural_size_.height() > 0 &&
  95       VideoFrame::IsValidConfig(format_, coded_size_, visible_rect_,
  96           natural_size_);
  97 }
  98
  99 bool VideoDecoderConfig::Matches(const VideoDecoderConfig& config) const {
 100   return ((codec() == config.codec()) &&
 101           (format() == config.format()) &&
 102           (profile() == config.profile()) &&
 103           (coded_size() == config.coded_size()) &&
 104           (visible_rect() == config.visible_rect()) &&
 105           (natural_size() == config.natural_size()) &&
 106           (extra_data_size() == config.extra_data_size()) &&
 107           (!extra_data() || !memcmp(extra_data(), config.extra_data(),
 108                                     extra_data_size())) &&
 109           (is_encrypted() == config.is_encrypted()));
 110 }
 111
 112 std::string VideoDecoderConfig::AsHumanReadableString() const {
 113   std::ostringstream s;
 114   s << "codec: " << codec()
 115     << " format: " << format()
 116     << " profile: " << profile()
 117     << " coded size: [" << coded_size().width()
 118     << "," << coded_size().height() << "]"
 119     << " visible rect: [" << visible_rect().x()
 120     << "," << visible_rect().y()
 121     << "," << visible_rect().width()
 122     << "," << visible_rect().height() << "]"
 123     << " natural size: [" << natural_size().width()
 124     << "," << natural_size().height() << "]"
 125     << " has extra data? " << (extra_data() ? "true" : "false")
 126     << " encrypted? " << (is_encrypted() ? "true" : "false");
 127   return s.str();
 128 }
 129
 130 VideoCodec VideoDecoderConfig::codec() const {
 131   return codec_;
 132 }
 133
 134 VideoCodecProfile VideoDecoderConfig::profile() const {
 135   return profile_;
 136 }
 137
 138 VideoFrame::Format VideoDecoderConfig::format() const {
 139   return format_;
 140 }
 141
 142 gfx::Size VideoDecoderConfig::coded_size() const {
 143   return coded_size_;
 144 }
 145
 146 gfx::Rect VideoDecoderConfig::visible_rect() const {
 147   return visible_rect_;
 148 }
 149
 150 gfx::Size VideoDecoderConfig::natural_size() const {
 151   return natural_size_;
 152 }
 153
 154 const uint8* VideoDecoderConfig::extra_data() const {
 155   if (extra_data_.empty())
 156     return NULL;
 157   return &extra_data_[0];
 158 }
 159
 160 size_t VideoDecoderConfig::extra_data_size() const {
 161   return extra_data_.size();
 162 }
 163
 164 bool VideoDecoderConfig::is_encrypted() const {
 165   return is_encrypted_;
 166 }
 167
 168 }  // namespace media