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/*
* Copyright (c) 2012 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 "webrtc/modules/video_processing/main/source/frame_preprocessor.h"
namespace webrtc {
VPMFramePreprocessor::VPMFramePreprocessor()
: content_metrics_(NULL),
resampled_frame_(),
enable_ca_(false),
frame_cnt_(0) {
spatial_resampler_ = new VPMSimpleSpatialResampler();
ca_ = new VPMContentAnalysis(true);
vd_ = new VPMVideoDecimator();
}
VPMFramePreprocessor::~VPMFramePreprocessor() {
Reset();
delete spatial_resampler_;
delete ca_;
delete vd_;
}
void VPMFramePreprocessor::Reset() {
ca_->Release();
vd_->Reset();
content_metrics_ = NULL;
spatial_resampler_->Reset();
enable_ca_ = false;
frame_cnt_ = 0;
}
void VPMFramePreprocessor::EnableTemporalDecimation(bool enable) {
vd_->EnableTemporalDecimation(enable);
}
void VPMFramePreprocessor::EnableContentAnalysis(bool enable) {
enable_ca_ = enable;
}
void VPMFramePreprocessor::SetInputFrameResampleMode(
VideoFrameResampling resampling_mode) {
spatial_resampler_->SetInputFrameResampleMode(resampling_mode);
}
int32_t VPMFramePreprocessor::SetTargetResolution(
uint32_t width, uint32_t height, uint32_t frame_rate) {
if ( (width == 0) || (height == 0) || (frame_rate == 0)) {
return VPM_PARAMETER_ERROR;
}
int32_t ret_val = 0;
ret_val = spatial_resampler_->SetTargetFrameSize(width, height);
if (ret_val < 0) return ret_val;
vd_->SetTargetFramerate(frame_rate);
return VPM_OK;
}
void VPMFramePreprocessor::SetTargetFramerate(int frame_rate) {
if (frame_rate == -1) {
vd_->EnableTemporalDecimation(false);
} else {
vd_->EnableTemporalDecimation(true);
vd_->SetTargetFramerate(frame_rate);
}
}
void VPMFramePreprocessor::UpdateIncomingframe_rate() {
vd_->UpdateIncomingframe_rate();
}
uint32_t VPMFramePreprocessor::Decimatedframe_rate() {
return vd_->Decimatedframe_rate();
}
uint32_t VPMFramePreprocessor::DecimatedWidth() const {
return spatial_resampler_->TargetWidth();
}
uint32_t VPMFramePreprocessor::DecimatedHeight() const {
return spatial_resampler_->TargetHeight();
}
int32_t VPMFramePreprocessor::PreprocessFrame(const VideoFrame& frame,
VideoFrame** processed_frame) {
if (frame.IsZeroSize()) {
return VPM_PARAMETER_ERROR;
}
vd_->UpdateIncomingframe_rate();
if (vd_->DropFrame()) {
return 1; // drop 1 frame
}
// Resizing incoming frame if needed. Otherwise, remains NULL.
// We are not allowed to resample the input frame (must make a copy of it).
*processed_frame = NULL;
if (spatial_resampler_->ApplyResample(frame.width(), frame.height())) {
int32_t ret = spatial_resampler_->ResampleFrame(frame, &resampled_frame_);
if (ret != VPM_OK) return ret;
*processed_frame = &resampled_frame_;
}
// Perform content analysis on the frame to be encoded.
if (enable_ca_) {
// Compute new metrics every |kSkipFramesCA| frames, starting with
// the first frame.
if (frame_cnt_ % kSkipFrameCA == 0) {
if (*processed_frame == NULL) {
content_metrics_ = ca_->ComputeContentMetrics(frame);
} else {
content_metrics_ = ca_->ComputeContentMetrics(resampled_frame_);
}
}
++frame_cnt_;
}
return VPM_OK;
}
VideoContentMetrics* VPMFramePreprocessor::ContentMetrics() const {
return content_metrics_;
}
} // namespace
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