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 #include "media/base/video_frame.h"
  10
  11 namespace media {
  12
  13 VideoDecoderConfig::VideoDecoderConfig()
  14     : codec_(kUnknownVideoCodec),
  15       profile_(VIDEO_CODEC_PROFILE_UNKNOWN),
  16       format_(PIXEL_FORMAT_UNKNOWN),
  17       is_encrypted_(false) {
  18 }
  19
  20 VideoDecoderConfig::VideoDecoderConfig(VideoCodec codec,
  21                                        VideoCodecProfile profile,
  22                                        VideoPixelFormat format,
  23                                        ColorSpace color_space,
  24                                        const gfx::Size& coded_size,
  25                                        const gfx::Rect& visible_rect,
  26                                        const gfx::Size& natural_size,
  27                                        const uint8* extra_data,
  28                                        size_t extra_data_size,
  29                                        bool is_encrypted) {
  30   Initialize(codec, profile, format, color_space, coded_size, visible_rect,
  31              natural_size, extra_data, extra_data_size, is_encrypted, true);
  32 }
  33
  34 VideoDecoderConfig::~VideoDecoderConfig() {}
  35
  36 // Some videos just want to watch the world burn, with a height of 0; cap the
  37 // "infinite" aspect ratio resulting.
  38 static const int kInfiniteRatio = 99999;
  39
  40 // Common aspect ratios (multiplied by 100 and truncated) used for histogramming
  41 // video sizes.  These were taken on 20111103 from
  42 // http://wikipedia.org/wiki/Aspect_ratio_(image)#Previous_and_currently_used_aspect_ratios
  43 static const int kCommonAspectRatios100[] = {
  44   100, 115, 133, 137, 143, 150, 155, 160, 166, 175, 177, 185, 200, 210, 220,
  45   221, 235, 237, 240, 255, 259, 266, 276, 293, 400, 1200, kInfiniteRatio,
  46 };
  47
  48 template<class T>  // T has int width() & height() methods.
  49 static void UmaHistogramAspectRatio(const char* name, const T& size) {
  50   UMA_HISTOGRAM_CUSTOM_ENUMERATION(
  51       name,
  52       // Intentionally use integer division to truncate the result.
  53       size.height() ? (size.width() * 100) / size.height() : kInfiniteRatio,
  54       base::CustomHistogram::ArrayToCustomRanges(
  55           kCommonAspectRatios100, arraysize(kCommonAspectRatios100)));
  56 }
  57
  58 void VideoDecoderConfig::Initialize(VideoCodec codec,
  59                                     VideoCodecProfile profile,
  60                                     VideoPixelFormat format,
  61                                     ColorSpace color_space,
  62                                     const gfx::Size& coded_size,
  63                                     const gfx::Rect& visible_rect,
  64                                     const gfx::Size& natural_size,
  65                                     const uint8* extra_data,
  66                                     size_t extra_data_size,
  67                                     bool is_encrypted,
  68                                     bool record_stats) {
  69   CHECK((extra_data_size != 0) == (extra_data != NULL));
  70
  71   if (record_stats) {
  72     UMA_HISTOGRAM_ENUMERATION("Media.VideoCodec", codec, kVideoCodecMax + 1);
  73     // Drop UNKNOWN because U_H_E() uses one bucket for all values less than 1.
  74     if (profile >= 0) {
  75       UMA_HISTOGRAM_ENUMERATION("Media.VideoCodecProfile", profile,
  76                                 VIDEO_CODEC_PROFILE_MAX + 1);
  77     }
  78     UMA_HISTOGRAM_COUNTS_10000("Media.VideoCodedWidth", coded_size.width());
  79     UmaHistogramAspectRatio("Media.VideoCodedAspectRatio", coded_size);
  80     UMA_HISTOGRAM_COUNTS_10000("Media.VideoVisibleWidth", visible_rect.width());
  81     UmaHistogramAspectRatio("Media.VideoVisibleAspectRatio", visible_rect);
  82     UMA_HISTOGRAM_ENUMERATION("Media.VideoFramePixelFormat", format,
  83                               PIXEL_FORMAT_MAX + 1);
  84     UMA_HISTOGRAM_ENUMERATION("Media.VideoFrameColorSpace", color_space,
  85                               COLOR_SPACE_MAX + 1);
  86   }
  87
  88   codec_ = codec;
  89   profile_ = profile;
  90   format_ = format;
  91   color_space_ = color_space;
  92   coded_size_ = coded_size;
  93   visible_rect_ = visible_rect;
  94   natural_size_ = natural_size;
  95   extra_data_.assign(extra_data, extra_data + extra_data_size);
  96   is_encrypted_ = is_encrypted;
  97 }
  98
  99 bool VideoDecoderConfig::IsValidConfig() const {
 100   return codec_ != kUnknownVideoCodec &&
 101       natural_size_.width() > 0 &&
 102       natural_size_.height() > 0 &&
 103       VideoFrame::IsValidConfig(format_, VideoFrame::STORAGE_UNOWNED_MEMORY,
 104                                 coded_size_, visible_rect_, natural_size_);
 105 }
 106
 107 bool VideoDecoderConfig::Matches(const VideoDecoderConfig& config) const {
 108   return ((codec() == config.codec()) &&
 109           (format() == config.format()) &&
 110           (profile() == config.profile()) &&
 111           (coded_size() == config.coded_size()) &&
 112           (visible_rect() == config.visible_rect()) &&
 113           (natural_size() == config.natural_size()) &&
 114           (extra_data_size() == config.extra_data_size()) &&
 115           (!extra_data() || !memcmp(extra_data(), config.extra_data(),
 116                                     extra_data_size())) &&
 117           (is_encrypted() == config.is_encrypted()));
 118 }
 119
 120 std::string VideoDecoderConfig::AsHumanReadableString() const {
 121   std::ostringstream s;
 122   s << "codec: " << GetHumanReadableCodecName()
 123     << " format: " << format()
 124     << " profile: " << profile()
 125     << " coded size: [" << coded_size().width()
 126     << "," << coded_size().height() << "]"
 127     << " visible rect: [" << visible_rect().x()
 128     << "," << visible_rect().y()
 129     << "," << visible_rect().width()
 130     << "," << visible_rect().height() << "]"
 131     << " natural size: [" << natural_size().width()
 132     << "," << natural_size().height() << "]"
 133     << " has extra data? " << (extra_data() ? "true" : "false")
 134     << " encrypted? " << (is_encrypted() ? "true" : "false");
 135   return s.str();
 136 }
 137
 138 // The names come from src/third_party/ffmpeg/libavcodec/codec_desc.c
 139 std::string VideoDecoderConfig::GetHumanReadableCodecName() const {
 140   switch (codec()) {
 141     case kUnknownVideoCodec:
 142       return "unknown";
 143     case kCodecH264:
 144       return "h264";
 145     case kCodecVC1:
 146       return "vc1";
 147     case kCodecMPEG2:
 148       return "mpeg2video";
 149     case kCodecMPEG4:
 150       return "mpeg4";
 151     case kCodecTheora:
 152       return "theora";
 153     case kCodecVP8:
 154       return "vp8";
 155     case kCodecVP9:
 156       return "vp9";
 157   }
 158   NOTREACHED();
 159   return "";
 160 }
 161
 162 const uint8* VideoDecoderConfig::extra_data() const {
 163   if (extra_data_.empty())
 164     return NULL;
 165   return &extra_data_[0];
 166 }
 167
 168 }  // namespace media