media/cast/sender/fake_software_video_encoder.cc

   1 // Copyright 2014 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/cast/sender/fake_software_video_encoder.h"
   6
   7 #include "base/json/json_writer.h"
   8 #include "base/values.h"
   9 #include "media/base/video_frame.h"
  10
  11 #ifndef OFFICIAL_BUILD
  12
  13 namespace media {
  14 namespace cast {
  15
  16 FakeSoftwareVideoEncoder::FakeSoftwareVideoEncoder(
  17     const VideoSenderConfig& video_config)
  18     : video_config_(video_config),
  19       next_frame_is_key_(true),
  20       frame_id_(0),
  21       frame_id_to_reference_(0),
  22       frame_size_(0) {
  23 }
  24
  25 FakeSoftwareVideoEncoder::~FakeSoftwareVideoEncoder() {}
  26
  27 void FakeSoftwareVideoEncoder::Initialize() {}
  28
  29 void FakeSoftwareVideoEncoder::Encode(
  30     const scoped_refptr<media::VideoFrame>& video_frame,
  31     const base::TimeTicks& reference_time,
  32     SenderEncodedFrame* encoded_frame) {
  33   DCHECK(encoded_frame);
  34
  35   if (video_frame->visible_rect().size() != last_frame_size_) {
  36     next_frame_is_key_ = true;
  37     last_frame_size_ = video_frame->visible_rect().size();
  38   }
  39
  40   encoded_frame->frame_id = frame_id_++;
  41   if (next_frame_is_key_) {
  42     encoded_frame->dependency = EncodedFrame::KEY;
  43     encoded_frame->referenced_frame_id = encoded_frame->frame_id;
  44     next_frame_is_key_ = false;
  45   } else {
  46     encoded_frame->dependency = EncodedFrame::DEPENDENT;
  47     encoded_frame->referenced_frame_id = encoded_frame->frame_id - 1;
  48   }
  49   encoded_frame->rtp_timestamp =
  50       TimeDeltaToRtpDelta(video_frame->timestamp(), kVideoFrequency);
  51   encoded_frame->reference_time = reference_time;
  52
  53   base::DictionaryValue values;
  54   values.SetBoolean("key",
  55                     encoded_frame->dependency == EncodedFrame::KEY);
  56   values.SetInteger("ref", encoded_frame->referenced_frame_id);
  57   values.SetInteger("id", encoded_frame->frame_id);
  58   values.SetInteger("size", frame_size_);
  59   base::JSONWriter::Write(values, &encoded_frame->data);
  60   encoded_frame->data.resize(
  61       std::max<size_t>(encoded_frame->data.size(), frame_size_), ' ');
  62
  63   if (encoded_frame->dependency == EncodedFrame::KEY) {
  64     encoded_frame->deadline_utilization = 1.0;
  65     encoded_frame->lossy_utilization = 6.0;
  66   } else {
  67     encoded_frame->deadline_utilization = 0.8;
  68     encoded_frame->lossy_utilization = 0.8;
  69   }
  70 }
  71
  72 void FakeSoftwareVideoEncoder::UpdateRates(uint32 new_bitrate) {
  73   frame_size_ = new_bitrate / video_config_.max_frame_rate / 8;
  74 }
  75
  76 void FakeSoftwareVideoEncoder::GenerateKeyFrame() {
  77   next_frame_is_key_ = true;
  78 }
  79
  80 void FakeSoftwareVideoEncoder::LatestFrameIdToReference(uint32 frame_id) {
  81   frame_id_to_reference_ = frame_id;
  82 }
  83
  84 }  // namespace cast
  85 }  // namespace media
  86
  87 #endif