Add initial bitrate and frame resolution parameters to quality scaler.

talk/app/webrtc/java/jni/androidmediaencoder_jni.cc

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 354 matching lines @@
   srand(time(NULL));
   AllowBlockingCalls();
 }
 
 int32_t MediaCodecVideoEncoder::InitEncode(
     const webrtc::VideoCodec* codec_settings,
     int32_t /* number_of_cores */,
     size_t /* max_payload_size */) {
   const int kMinWidth = 320;
   const int kMinHeight = 180;
-  const int kLowQpThresholdDenominator = 3;
   if (codec_settings == NULL) {
     ALOGE << "NULL VideoCodec instance";
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
   // Factory should guard against other codecs being used with us.
   RTC_CHECK(codec_settings->codecType == codecType_)
       << "Unsupported codec " << codec_settings->codecType << " for "
       << codecType_;
 
   ALOGD << "InitEncode request";
   codec_mode_ = codec_settings->mode;
   scale_ = (codecType_ != kVideoCodecVP9) && (webrtc::field_trial::FindFullName(
         "WebRTC-MediaCodecVideoEncoder-AutomaticResize") == "Enabled");
   ALOGD << "Encoder automatic resize " << (scale_ ? "enabled" : "disabled");
   if (scale_) {
     if (codecType_ == kVideoCodecVP8) {
       // QP is obtained from VP8-bitstream for HW, so the QP corresponds to the
       // (internal) range: [0, 127]. And we cannot change QP_max in HW, so it is
       // always = 127. Note that in SW, QP is that of the user-level range [0,
       // 63].
-      const int kMaxQp = 127;
-      const int kBadQpThreshold = 95;
-      quality_scaler_.Init(
-          kMaxQp / kLowQpThresholdDenominator, kBadQpThreshold, false);
+      const int kLowQpThreshold = 32;
+      const int kBadQpThreshold = 92;
+      quality_scaler_.Init(kLowQpThreshold, kBadQpThreshold, false,
+          codec_settings->startBitrate,
+          codec_settings->width, codec_settings->height);
     } else if (codecType_ == kVideoCodecH264) {
       // H264 QP is in the range [0, 51].
       const int kMaxQp = 51;
+      const int kLowQpThresholdDenominator = 3;

[pbos-webrtc, 2016/02/09 20:31:29]

Let's just put a constant here without the denominator.

[AlexG, 2016/02/09 23:37:18]

Done.

       const int kBadQpThreshold = 40;
       quality_scaler_.Init(
-          kMaxQp / kLowQpThresholdDenominator, kBadQpThreshold, false);
+          kMaxQp / kLowQpThresholdDenominator, kBadQpThreshold, false,
+          codec_settings->startBitrate,
+          codec_settings->width, codec_settings->height);
     } else {
       // When adding codec support to additional hardware codecs, also configure
       // their QP thresholds for scaling.
       RTC_NOTREACHED() << "Unsupported codec without configured QP thresholds.";
     }
     quality_scaler_.SetMinResolution(kMinWidth, kMinHeight);
     quality_scaler_.ReportFramerate(codec_settings->maxFramerate);
   }
   return codec_thread_->Invoke<int32_t>(
       Bind(&MediaCodecVideoEncoder::InitEncodeOnCodecThread,
@@ skipping 839 matching lines @@
 }
 
 void MediaCodecVideoEncoderFactory::DestroyVideoEncoder(
     webrtc::VideoEncoder* encoder) {
   ALOGD << "Destroy video encoder.";
   delete encoder;
 }
 
 }  // namespace webrtc_jni