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      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::UNKNOWN),
     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     UMA_HISTOGRAM_ENUMERATION(
     80         "Media.VideoPixelFormat", format, VideoFrame::FORMAT_MAX + 1);
     81   }
     82 
     83   codec_ = codec;
     84   profile_ = profile;
     85   format_ = format;
     86   coded_size_ = coded_size;
     87   visible_rect_ = visible_rect;
     88   natural_size_ = natural_size;
     89   extra_data_.assign(extra_data, extra_data + extra_data_size);
     90   is_encrypted_ = is_encrypted;
     91 }
     92 
     93 bool VideoDecoderConfig::IsValidConfig() const {
     94   return codec_ != kUnknownVideoCodec &&
     95       natural_size_.width() > 0 &&
     96       natural_size_.height() > 0 &&
     97       VideoFrame::IsValidConfig(format_, coded_size_, visible_rect_,
     98           natural_size_);
     99 }
    100 
    101 bool VideoDecoderConfig::Matches(const VideoDecoderConfig& config) const {
    102   return ((codec() == config.codec()) &&
    103           (format() == config.format()) &&
    104           (profile() == config.profile()) &&
    105           (coded_size() == config.coded_size()) &&
    106           (visible_rect() == config.visible_rect()) &&
    107           (natural_size() == config.natural_size()) &&
    108           (extra_data_size() == config.extra_data_size()) &&
    109           (!extra_data() || !memcmp(extra_data(), config.extra_data(),
    110                                     extra_data_size())) &&
    111           (is_encrypted() == config.is_encrypted()));
    112 }
    113 
    114 std::string VideoDecoderConfig::AsHumanReadableString() const {
    115   std::ostringstream s;
    116   s << "codec: " << codec()
    117     << " format: " << format()
    118     << " profile: " << profile()
    119     << " coded size: [" << coded_size().width()
    120     << "," << coded_size().height() << "]"
    121     << " visible rect: [" << visible_rect().x()
    122     << "," << visible_rect().y()
    123     << "," << visible_rect().width()
    124     << "," << visible_rect().height() << "]"
    125     << " natural size: [" << natural_size().width()
    126     << "," << natural_size().height() << "]"
    127     << " has extra data? " << (extra_data() ? "true" : "false")
    128     << " encrypted? " << (is_encrypted() ? "true" : "false");
    129   return s.str();
    130 }
    131 
    132 VideoCodec VideoDecoderConfig::codec() const {
    133   return codec_;
    134 }
    135 
    136 VideoCodecProfile VideoDecoderConfig::profile() const {
    137   return profile_;
    138 }
    139 
    140 VideoFrame::Format VideoDecoderConfig::format() const {
    141   return format_;
    142 }
    143 
    144 gfx::Size VideoDecoderConfig::coded_size() const {
    145   return coded_size_;
    146 }
    147 
    148 gfx::Rect VideoDecoderConfig::visible_rect() const {
    149   return visible_rect_;
    150 }
    151 
    152 gfx::Size VideoDecoderConfig::natural_size() const {
    153   return natural_size_;
    154 }
    155 
    156 const uint8* VideoDecoderConfig::extra_data() const {
    157   if (extra_data_.empty())
    158     return NULL;
    159   return &extra_data_[0];
    160 }
    161 
    162 size_t VideoDecoderConfig::extra_data_size() const {
    163   return extra_data_.size();
    164 }
    165 
    166 bool VideoDecoderConfig::is_encrypted() const {
    167   return is_encrypted_;
    168 }
    169 
    170 }  // namespace media
    171