webrtc/api/video_codecs/video_encoder.cc

/*
 *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include "api/video_codecs/video_encoder.h"

#include <string.h>

#include "rtc_base/checks.h"

namespace webrtc {

// TODO(mflodman): Add default complexity for VP9 and VP9.
VideoCodecVP8 VideoEncoder::GetDefaultVp8Settings() {
  VideoCodecVP8 vp8_settings;
  memset(&vp8_settings, 0, sizeof(vp8_settings));

  vp8_settings.numberOfTemporalLayers = 1;
  vp8_settings.denoisingOn = true;
  vp8_settings.automaticResizeOn = false;
  vp8_settings.frameDroppingOn = true;
  vp8_settings.keyFrameInterval = 3000;

  return vp8_settings;
}

VideoCodecVP9 VideoEncoder::GetDefaultVp9Settings() {
  VideoCodecVP9 vp9_settings;
  memset(&vp9_settings, 0, sizeof(vp9_settings));

  vp9_settings.numberOfTemporalLayers = 1;
  vp9_settings.denoisingOn = true;
  vp9_settings.frameDroppingOn = true;
  vp9_settings.keyFrameInterval = 3000;
  vp9_settings.adaptiveQpMode = true;
  vp9_settings.automaticResizeOn = true;
  vp9_settings.numberOfSpatialLayers = 1;
  vp9_settings.flexibleMode = false;
  vp9_settings.interLayerPred = InterLayerPredMode::kOn;

  return vp9_settings;
}

VideoCodecH264 VideoEncoder::GetDefaultH264Settings() {
  VideoCodecH264 h264_settings;
  memset(&h264_settings, 0, sizeof(h264_settings));

  h264_settings.frameDroppingOn = true;
  h264_settings.keyFrameInterval = 3000;
  h264_settings.numberOfTemporalLayers = 1;

  return h264_settings;
}

VideoEncoder::ScalingSettings::ScalingSettings() = default;

VideoEncoder::ScalingSettings::ScalingSettings(KOff) : ScalingSettings() {}

VideoEncoder::ScalingSettings::ScalingSettings(int low, int high)
    : thresholds(QpThresholds(low, high)) {}

VideoEncoder::ScalingSettings::ScalingSettings(int low,
                                               int high,
                                               int min_pixels)
    : thresholds(QpThresholds(low, high)), min_pixels_per_frame(min_pixels) {}

VideoEncoder::ScalingSettings::ScalingSettings(const ScalingSettings&) =
    default;

VideoEncoder::ScalingSettings::~ScalingSettings() {}

// static
constexpr VideoEncoder::ScalingSettings::KOff
    VideoEncoder::ScalingSettings::kOff;
// static
constexpr uint8_t VideoEncoder::EncoderInfo::kMaxFramerateFraction;

VideoEncoder::EncoderInfo::EncoderInfo()
    : scaling_settings(VideoEncoder::ScalingSettings::kOff),
      supports_native_handle(false),
      implementation_name("unknown"),
      has_trusted_rate_controller(false),
      is_hardware_accelerated(true),
      has_internal_source(false),
      fps_allocation{absl::InlinedVector<uint8_t, kMaxTemporalStreams>(
          1,
          kMaxFramerateFraction)} {}

VideoEncoder::EncoderInfo::EncoderInfo(const EncoderInfo&) = default;

VideoEncoder::EncoderInfo::~EncoderInfo() = default;

VideoEncoder::RateControlParameters::RateControlParameters()
    : bitrate(VideoBitrateAllocation()),
      framerate_fps(0.0),
      bandwidth_allocation(DataRate::Zero()) {}

VideoEncoder::RateControlParameters::RateControlParameters(
    const VideoBitrateAllocation& bitrate,
    double framerate_fps)
    : bitrate(bitrate),
      framerate_fps(framerate_fps),
      bandwidth_allocation(DataRate::bps(bitrate.get_sum_bps())) {}

VideoEncoder::RateControlParameters::RateControlParameters(
    const VideoBitrateAllocation& bitrate,
    double framerate_fps,
    DataRate bandwidth_allocation)
    : bitrate(bitrate),
      framerate_fps(framerate_fps),
      bandwidth_allocation(bandwidth_allocation) {}

VideoEncoder::RateControlParameters::~RateControlParameters() = default;

int32_t VideoEncoder::InitEncode(const VideoCodec* codec_settings,
                                 int32_t number_of_cores,
                                 size_t max_payload_size) {
  const VideoEncoder::Capabilities capabilities(/* loss_notification= */ false);
  const VideoEncoder::Settings settings(capabilities, number_of_cores,
                                        max_payload_size);
  // In theory, this and the other version of InitEncode() could end up calling
  // each other in a loop until we get a stack overflow.
  // In practice, any subclass of VideoEncoder would overload at least one
  // of these, and we have a TODO in the header file to make this pure virtual.
  return InitEncode(codec_settings, settings);
}

int VideoEncoder::InitEncode(const VideoCodec* codec_settings,
                             const VideoEncoder::Settings& settings) {
  // In theory, this and the other version of InitEncode() could end up calling
  // each other in a loop until we get a stack overflow.
  // In practice, any subclass of VideoEncoder would overload at least one
  // of these, and we have a TODO in the header file to make this pure virtual.
  return InitEncode(codec_settings, settings.number_of_cores,
                    settings.max_payload_size);
}

void VideoEncoder::OnPacketLossRateUpdate(float packet_loss_rate) {}

void VideoEncoder::OnRttUpdate(int64_t rtt_ms) {}

void VideoEncoder::OnLossNotification(
    const LossNotification& loss_notification) {}

// TODO(webrtc:9722): Remove and make pure virtual.
VideoEncoder::EncoderInfo VideoEncoder::GetEncoderInfo() const {
  return EncoderInfo();
}

}  // namespace webrtc