text: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #include "media/base/video_decoder_config.h"
  
  #include "base/logging.h"
  #include "base/metrics/histogram.h"
  
  namespace media {
  
  VideoDecoderConfig::VideoDecoderConfig()
      : codec_(kUnknownVideoCodec),
        profile_(VIDEO_CODEC_PROFILE_UNKNOWN),
        format_(VideoFrame::UNKNOWN),
        is_encrypted_(false) {
  }
  
  VideoDecoderConfig::VideoDecoderConfig(VideoCodec codec,
                                         VideoCodecProfile profile,
                                         VideoFrame::Format format,
                                         const gfx::Size& coded_size,
                                         const gfx::Rect& visible_rect,
                                         const gfx::Size& natural_size,
                                         const uint8* extra_data,
                                         size_t extra_data_size,
                                         bool is_encrypted) {
    Initialize(codec, profile, format, coded_size, visible_rect, natural_size,
               extra_data, extra_data_size, is_encrypted, true);
  }
  
  VideoDecoderConfig::~VideoDecoderConfig() {}
  
  // Some videos just want to watch the world burn, with a height of 0; cap the
  // "infinite" aspect ratio resulting.
  static const int kInfiniteRatio = 99999;
  
  // Common aspect ratios (multiplied by 100 and truncated) used for histogramming
  // video sizes.  These were taken on 20111103 from
  // http://wikipedia.org/wiki/Aspect_ratio_(image)#Previous_and_currently_used_aspect_ratios
  static const int kCommonAspectRatios100[] = {
    100, 115, 133, 137, 143, 150, 155, 160, 166, 175, 177, 185, 200, 210, 220,
    221, 235, 237, 240, 255, 259, 266, 276, 293, 400, 1200, kInfiniteRatio,
  };
  
  template<class T>  // T has int width() & height() methods.
  static void UmaHistogramAspectRatio(const char* name, const T& size) {
    UMA_HISTOGRAM_CUSTOM_ENUMERATION(
        name,
        // Intentionally use integer division to truncate the result.
        size.height() ? (size.width() * 100) / size.height() : kInfiniteRatio,
        base::CustomHistogram::ArrayToCustomRanges(
            kCommonAspectRatios100, arraysize(kCommonAspectRatios100)));
  }
  
  void VideoDecoderConfig::Initialize(VideoCodec codec,
                                      VideoCodecProfile profile,
                                      VideoFrame::Format format,
                                      const gfx::Size& coded_size,
                                      const gfx::Rect& visible_rect,
                                      const gfx::Size& natural_size,
                                      const uint8* extra_data,
                                      size_t extra_data_size,
                                      bool is_encrypted,
                                      bool record_stats) {
    CHECK((extra_data_size != 0) == (extra_data != NULL));
  
    if (record_stats) {
      UMA_HISTOGRAM_ENUMERATION("Media.VideoCodec", codec, kVideoCodecMax + 1);
      // Drop UNKNOWN because U_H_E() uses one bucket for all values less than 1.
      if (profile >= 0) {
        UMA_HISTOGRAM_ENUMERATION("Media.VideoCodecProfile", profile,
                                  VIDEO_CODEC_PROFILE_MAX + 1);
      }
      UMA_HISTOGRAM_COUNTS_10000("Media.VideoCodedWidth", coded_size.width());
      UmaHistogramAspectRatio("Media.VideoCodedAspectRatio", coded_size);
      UMA_HISTOGRAM_COUNTS_10000("Media.VideoVisibleWidth", visible_rect.width());
      UmaHistogramAspectRatio("Media.VideoVisibleAspectRatio", visible_rect);
      UMA_HISTOGRAM_ENUMERATION(
          "Media.VideoPixelFormat", format, VideoFrame::FORMAT_MAX + 1);
    }
  
    codec_ = codec;
    profile_ = profile;
    format_ = format;
    coded_size_ = coded_size;
    visible_rect_ = visible_rect;
    natural_size_ = natural_size;
    extra_data_.assign(extra_data, extra_data + extra_data_size);
    is_encrypted_ = is_encrypted;
  }
  
  bool VideoDecoderConfig::IsValidConfig() const {
    return codec_ != kUnknownVideoCodec &&
        natural_size_.width() > 0 &&
        natural_size_.height() > 0 &&
        VideoFrame::IsValidConfig(format_, coded_size_, visible_rect_,
            natural_size_);
  }
  
  bool VideoDecoderConfig::Matches(const VideoDecoderConfig& config) const {
    return ((codec() == config.codec()) &&
            (format() == config.format()) &&
            (profile() == config.profile()) &&
            (coded_size() == config.coded_size()) &&
            (visible_rect() == config.visible_rect()) &&
            (natural_size() == config.natural_size()) &&
            (extra_data_size() == config.extra_data_size()) &&
            (!extra_data() || !memcmp(extra_data(), config.extra_data(),
                                      extra_data_size())) &&
            (is_encrypted() == config.is_encrypted()));
  }
  
  std::string VideoDecoderConfig::AsHumanReadableString() const {
    std::ostringstream s;
    s << "codec: " << codec()
      << " format: " << format()
      << " profile: " << profile()
      << " coded size: [" << coded_size().width()
      << "," << coded_size().height() << "]"
      << " visible rect: [" << visible_rect().x()
      << "," << visible_rect().y()
      << "," << visible_rect().width()
      << "," << visible_rect().height() << "]"
      << " natural size: [" << natural_size().width()
      << "," << natural_size().height() << "]"
      << " has extra data? " << (extra_data() ? "true" : "false")
      << " encrypted? " << (is_encrypted() ? "true" : "false");
    return s.str();
  }
  
  VideoCodec VideoDecoderConfig::codec() const {
    return codec_;
  }
  
  VideoCodecProfile VideoDecoderConfig::profile() const {
    return profile_;
  }
  
  VideoFrame::Format VideoDecoderConfig::format() const {
    return format_;
  }
  
  gfx::Size VideoDecoderConfig::coded_size() const {
    return coded_size_;
  }
  
  gfx::Rect VideoDecoderConfig::visible_rect() const {
    return visible_rect_;
  }
  
  gfx::Size VideoDecoderConfig::natural_size() const {
    return natural_size_;
  }
  
  const uint8* VideoDecoderConfig::extra_data() const {
    if (extra_data_.empty())
      return NULL;
    return &extra_data_[0];
  }
  
  size_t VideoDecoderConfig::extra_data_size() const {
    return extra_data_.size();
  }
  
  bool VideoDecoderConfig::is_encrypted() const {
    return is_encrypted_;
  }
  
  }  // namespace media
  