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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/common_video/libyuv/include/scaler.h"
#include "third_party/libyuv/include/libyuv.h"
namespace webrtc {
Scaler::Scaler()
: method_(kScaleBox),
src_width_(0),
src_height_(0),
dst_width_(0),
dst_height_(0),
set_(false) {}
Scaler::~Scaler() {}
int Scaler::Set(int src_width, int src_height,
int dst_width, int dst_height,
VideoType src_video_type, VideoType dst_video_type,
ScaleMethod method) {
set_ = false;
if (src_width < 1 || src_height < 1 || dst_width < 1 || dst_height < 1)
return -1;
if (!SupportedVideoType(src_video_type, dst_video_type))
return -1;
src_width_ = src_width;
src_height_ = src_height;
dst_width_ = dst_width;
dst_height_ = dst_height;
method_ = method;
set_ = true;
return 0;
}
int Scaler::Scale(const I420VideoFrame& src_frame,
I420VideoFrame* dst_frame) {
assert(dst_frame);
if (src_frame.IsZeroSize())
return -1;
if (!set_)
return -2;
// Making sure that destination frame is of sufficient size.
// Aligning stride values based on width.
dst_frame->CreateEmptyFrame(dst_width_, dst_height_,
dst_width_, (dst_width_ + 1) / 2,
(dst_width_ + 1) / 2);
return libyuv::I420Scale(src_frame.buffer(kYPlane),
src_frame.stride(kYPlane),
src_frame.buffer(kUPlane),
src_frame.stride(kUPlane),
src_frame.buffer(kVPlane),
src_frame.stride(kVPlane),
src_width_, src_height_,
dst_frame->buffer(kYPlane),
dst_frame->stride(kYPlane),
dst_frame->buffer(kUPlane),
dst_frame->stride(kUPlane),
dst_frame->buffer(kVPlane),
dst_frame->stride(kVPlane),
dst_width_, dst_height_,
libyuv::FilterMode(method_));
}
// TODO(mikhal): Add support for more types.
bool Scaler::SupportedVideoType(VideoType src_video_type,
VideoType dst_video_type) {
if (src_video_type != dst_video_type)
return false;
if ((src_video_type == kI420) || (src_video_type == kIYUV) ||
(src_video_type == kYV12))
return true;
return false;
}
} // namespace webrtc
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