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Move the QP scaling thresholds to the relevant encoders.

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Also provide a new set of thresholds for the VideoToolbox encoder. The new thresholds were experimentally determined to work well on the iPhone 6S, and also adequately on the iPhone 5S.

BUG=webrtc:5678

Review-Url: https://codereview.webrtc.org/2309743002
Cr-Commit-Position: refs/heads/master@{#14420}
This commit is contained in:
kthelgason
2016-09-28 08:17:43 -07:00
committed by Commit bot
parent e75f204b06
commit 478681e1e6
6 changed files with 52 additions and 46 deletions
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15
webrtc/modules/video_coding/utility/quality_scaler.h
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@ -11,6 +11,7 @@
#ifndef WEBRTC_MODULES_VIDEO_CODING_UTILITY_QUALITY_SCALER_H_
#define WEBRTC_MODULES_VIDEO_CODING_UTILITY_QUALITY_SCALER_H_
#include "webrtc/common_types.h"
#include "webrtc/common_video/include/i420_buffer_pool.h"
#include "webrtc/modules/video_coding/utility/moving_average.h"
@ -23,6 +24,11 @@ class QualityScaler {
};
QualityScaler();
void Init(VideoCodecType codec_type,
int initial_bitrate_kbps,
int width,
int height,
int fps);
void Init(int low_qp_threshold,
int high_qp_threshold,
int initial_bitrate_kbps,
@ -38,15 +44,6 @@ class QualityScaler {
const rtc::scoped_refptr<VideoFrameBuffer>& frame);
int downscale_shift() const { return downscale_shift_; }
// QP is obtained from VP8-bitstream for HW, so the QP corresponds to the
// bitstream range of [0, 127] and not the user-level range of [0,63].
static const int kLowVp8QpThreshold;
static const int kBadVp8QpThreshold;
// H264 QP is in the range [0, 51].
static const int kLowH264QpThreshold;
static const int kBadH264QpThreshold;
private:
void ClearSamples();
void ScaleUp();