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webrtc::Scaler: Preserve aspect ratio

Browse Source 
BUG=3936
R=glaznev@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/28969004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7679 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
magjed@webrtc.org 2014-11-11 09:51:30 +00:00
parent cd621a8657
commit 809986b95f
2 changed files with 183 additions and 115 deletions
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31
webrtc/common_video/libyuv/scaler.cc
View File

@ -10,6 +10,8 @@
#include "webrtc/common_video/libyuv/include/scaler.h"
#include <algorithm>
// NOTE(ajm): Path provided by gyp.
#include "libyuv.h" // NOLINT
@ -59,13 +61,34 @@ int Scaler::Scale(const I420VideoFrame& src_frame,
dst_width_, (dst_width_ + 1) / 2,
(dst_width_ + 1) / 2);
return libyuv::I420Scale(src_frame.buffer(kYPlane),
// We want to preserve aspect ratio instead of stretching the frame.
// Therefore, we need to crop the source frame. Calculate the largest center
// aligned region of the source frame that can be used.
const int cropped_src_width =
std::min(src_width_, dst_width_ * src_height_ / dst_height_);
const int cropped_src_height =
std::min(src_height_, dst_height_ * src_width_ / dst_width_);
// Make sure the offsets are even to avoid rounding errors for the U/V planes.
const int src_offset_x = ((src_width_ - cropped_src_width) / 2) & ~1;
const int src_offset_y = ((src_height_ - cropped_src_height) / 2) & ~1;
const uint8_t* y_ptr = src_frame.buffer(kYPlane) +
src_offset_y * src_frame.stride(kYPlane) +
src_offset_x;
const uint8_t* u_ptr = src_frame.buffer(kUPlane) +
src_offset_y / 2 * src_frame.stride(kUPlane) +
src_offset_x / 2;
const uint8_t* v_ptr = src_frame.buffer(kVPlane) +
src_offset_y / 2 * src_frame.stride(kVPlane) +
src_offset_x / 2;
return libyuv::I420Scale(y_ptr,
src_frame.stride(kYPlane),
src_frame.buffer(kUPlane),
u_ptr,
src_frame.stride(kUPlane),
src_frame.buffer(kVPlane),
v_ptr,
src_frame.stride(kVPlane),
src_width_, src_height_,
cropped_src_width, cropped_src_height,
dst_frame->buffer(kYPlane),
dst_frame->stride(kYPlane),
dst_frame->buffer(kUPlane),

267
webrtc/modules/video_processing/main/test/unit_test/video_processing_unittest.cc
View File

@ -18,16 +18,34 @@
namespace webrtc {
// The |sourceFrame| is scaled to |targetwidth_|,|targetheight_|, using the
// filter mode set to |mode|. The |expected_psnr| is used to verify basic
// quality when the resampled frame is scaled back up/down to the
// original/source size. |expected_psnr| is set to be ~0.1/0.05dB lower than
// actual PSNR verified under the same conditions.
void TestSize(const I420VideoFrame& sourceFrame, int targetwidth_,
int targetheight_, int mode, double expected_psnr,
VideoProcessingModule* vpm);
static void PreprocessFrameAndVerify(const I420VideoFrame& source,
int target_width,
int target_height,
VideoProcessingModule* vpm,
I420VideoFrame** out_frame);
static void CropFrame(const uint8_t* source_data,
int source_width,
int source_height,
int offset_x,
int offset_y,
int cropped_width,
int cropped_height,
I420VideoFrame* cropped_frame);
// The |source_data| is cropped and scaled to |target_width| x |target_height|,
// and then scaled back to the expected cropped size. |expected_psnr| is used to
// verify basic quality, and is set to be ~0.1/0.05dB lower than actual PSNR
// verified under the same conditions.
static void TestSize(const I420VideoFrame& source_frame,
const I420VideoFrame& cropped_source_frame,
int target_width,
int target_height,
double expected_psnr,
VideoProcessingModule* vpm);
bool CompareFrames(const webrtc::I420VideoFrame& frame1,
const webrtc::I420VideoFrame& frame2);
const webrtc::I420VideoFrame& frame2);
static void WriteProcessedFrameForVisualInspection(
const I420VideoFrame& source,
const I420VideoFrame& processed);
VideoProcessingModuleTest::VideoProcessingModuleTest()
: vpm_(NULL),
@ -190,13 +208,8 @@ TEST_F(VideoProcessingModuleTest, PreprocessorLogic) {
I420VideoFrame* out_frame = NULL;
// Set rescaling => output frame != NULL.
vpm_->SetInputFrameResampleMode(kFastRescaling);
EXPECT_EQ(VPM_OK, vpm_->SetTargetResolution(resolution, resolution, 30));
EXPECT_EQ(VPM_OK, vpm_->PreprocessFrame(video_frame_, &out_frame));
EXPECT_FALSE(out_frame == NULL);
if (out_frame) {
EXPECT_EQ(resolution, out_frame->width());
EXPECT_EQ(resolution, out_frame->height());
}
PreprocessFrameAndVerify(video_frame_, resolution, resolution, vpm_,
&out_frame);
// No rescaling=> output frame = NULL.
vpm_->SetInputFrameResampleMode(kNoRescaling);
EXPECT_EQ(VPM_OK, vpm_->PreprocessFrame(video_frame_, &out_frame));
@ -207,11 +220,7 @@ TEST_F(VideoProcessingModuleTest, Resampler) {
enum { NumRuns = 1 };
int64_t min_runtime = 0;
int64_t avg_runtime = 0;
TickTime t0;
TickTime t1;
TickInterval acc_ticks;
int64_t total_runtime = 0;
rewind(source_file_);
ASSERT_TRUE(source_file_ != NULL) <<
@ -230,118 +239,138 @@ TEST_F(VideoProcessingModuleTest, Resampler) {
EXPECT_EQ(0, ConvertToI420(kI420, video_buffer.get(), 0, 0,
width_, height_,
0, kRotateNone, &video_frame_));
// Cropped source frame that will contain the expected visible region.
I420VideoFrame cropped_source_frame;
cropped_source_frame.CopyFrame(video_frame_);
for (uint32_t run_idx = 0; run_idx < NumRuns; run_idx++) {
// Initiate test timer.
t0 = TickTime::Now();
const TickTime time_start = TickTime::Now();
// Init the sourceFrame with a timestamp.
video_frame_.set_render_time_ms(t0.MillisecondTimestamp());
video_frame_.set_timestamp(t0.MillisecondTimestamp() * 90);
video_frame_.set_render_time_ms(time_start.MillisecondTimestamp());
video_frame_.set_timestamp(time_start.MillisecondTimestamp() * 90);
// Test scaling to different sizes: source is of |width|/|height| = 352/288.
// Scaling mode in VPM is currently fixed to kScaleBox (mode = 3).
TestSize(video_frame_, 100, 50, 3, 24.0, vpm_);
TestSize(video_frame_, 352/4, 288/4, 3, 25.2, vpm_);
TestSize(video_frame_, 352/2, 288/2, 3, 28.1, vpm_);
TestSize(video_frame_, 352, 288, 3, -1, vpm_); // no resampling.
TestSize(video_frame_, 2*352, 2*288, 3, 32.2, vpm_);
TestSize(video_frame_, 400, 256, 3, 31.3, vpm_);
TestSize(video_frame_, 480, 640, 3, 32.15, vpm_);
TestSize(video_frame_, 960, 720, 3, 32.2, vpm_);
TestSize(video_frame_, 1280, 720, 3, 32.15, vpm_);
// Pure scaling:
TestSize(video_frame_, video_frame_, width_ / 4, height_ / 4, 25.2, vpm_);
TestSize(video_frame_, video_frame_, width_ / 2, height_ / 2, 28.1, vpm_);
// No resampling:
TestSize(video_frame_, video_frame_, width_, height_, -1, vpm_);
TestSize(video_frame_, video_frame_, 2 * width_, 2 * height_, 32.2, vpm_);
// Scaling and cropping. The cropped source frame is the largest center
// aligned region that can be used from the source while preserving aspect
// ratio.
CropFrame(video_buffer.get(), width_, height_, 0, 56, 352, 176,
&cropped_source_frame);
TestSize(video_frame_, cropped_source_frame, 100, 50, 24.0, vpm_);
CropFrame(video_buffer.get(), width_, height_, 0, 30, 352, 225,
&cropped_source_frame);
TestSize(video_frame_, cropped_source_frame, 400, 256, 31.3, vpm_);
CropFrame(video_buffer.get(), width_, height_, 68, 0, 216, 288,
&cropped_source_frame);
TestSize(video_frame_, cropped_source_frame, 480, 640, 32.15, vpm_);
CropFrame(video_buffer.get(), width_, height_, 0, 12, 352, 264,
&cropped_source_frame);
TestSize(video_frame_, cropped_source_frame, 960, 720, 32.2, vpm_);
CropFrame(video_buffer.get(), width_, height_, 0, 44, 352, 198,
&cropped_source_frame);
TestSize(video_frame_, cropped_source_frame, 1280, 720, 32.15, vpm_);
// Upsampling to odd size.
TestSize(video_frame_, 501, 333, 3, 32.05, vpm_);
CropFrame(video_buffer.get(), width_, height_, 0, 26, 352, 233,
&cropped_source_frame);
TestSize(video_frame_, cropped_source_frame, 501, 333, 32.05, vpm_);
// Downsample to odd size.
TestSize(video_frame_, 281, 175, 3, 29.3, vpm_);
CropFrame(video_buffer.get(), width_, height_, 0, 34, 352, 219,
&cropped_source_frame);
TestSize(video_frame_, cropped_source_frame, 281, 175, 29.3, vpm_);
// stop timer
t1 = TickTime::Now();
acc_ticks += (t1 - t0);
if (acc_ticks.Microseconds() < min_runtime || run_idx == 0) {
min_runtime = acc_ticks.Microseconds();
// Stop timer.
const int64_t runtime = (TickTime::Now() - time_start).Microseconds();
if (runtime < min_runtime || run_idx == 0) {
min_runtime = runtime;
}
avg_runtime += acc_ticks.Microseconds();
total_runtime += runtime;
}
printf("\nAverage run time = %d us / frame\n",
//static_cast<int>(avg_runtime / frameNum / NumRuns));
static_cast<int>(avg_runtime));
static_cast<int>(total_runtime));
printf("Min run time = %d us / frame\n\n",
//static_cast<int>(min_runtime / frameNum));
static_cast<int>(min_runtime));
}
void TestSize(const I420VideoFrame& source_frame, int targetwidth_,
int targetheight_, int mode, double expected_psnr,
void PreprocessFrameAndVerify(const I420VideoFrame& source,
int target_width,
int target_height,
VideoProcessingModule* vpm,
I420VideoFrame** out_frame) {
ASSERT_EQ(VPM_OK, vpm->SetTargetResolution(target_width, target_height, 30));
ASSERT_EQ(VPM_OK, vpm->PreprocessFrame(source, out_frame));
// If no resizing is needed, expect NULL.
if (target_width == source.width() && target_height == source.height()) {
EXPECT_EQ(NULL, *out_frame);
return;
}
// Verify the resampled frame.
EXPECT_TRUE(*out_frame != NULL);
EXPECT_EQ(source.render_time_ms(), (*out_frame)->render_time_ms());
EXPECT_EQ(source.timestamp(), (*out_frame)->timestamp());
EXPECT_EQ(target_width, (*out_frame)->width());
EXPECT_EQ(target_height, (*out_frame)->height());
}
void CropFrame(const uint8_t* source_data,
int source_width,
int source_height,
int offset_x,
int offset_y,
int cropped_width,
int cropped_height,
I420VideoFrame* cropped_frame) {
cropped_frame->set_width(cropped_width);
cropped_frame->set_height(cropped_height);
EXPECT_EQ(0,
ConvertToI420(kI420, source_data, offset_x, offset_y, source_width,
source_height, 0, kRotateNone, cropped_frame));
}
void TestSize(const I420VideoFrame& source_frame,
const I420VideoFrame& cropped_source_frame,
int target_width,
int target_height,
double expected_psnr,
VideoProcessingModule* vpm) {
int sourcewidth_ = source_frame.width();
int sourceheight_ = source_frame.height();
// Resample source_frame to out_frame.
I420VideoFrame* out_frame = NULL;
vpm->SetInputFrameResampleMode(kBox);
PreprocessFrameAndVerify(source_frame, target_width, target_height, vpm,
&out_frame);
if (out_frame == NULL)
return;
WriteProcessedFrameForVisualInspection(source_frame, *out_frame);
ASSERT_EQ(VPM_OK, vpm->SetTargetResolution(targetwidth_, targetheight_, 30));
ASSERT_EQ(VPM_OK, vpm->PreprocessFrame(source_frame, &out_frame));
// Scale |resampled_source_frame| back to the source scale.
I420VideoFrame resampled_source_frame;
resampled_source_frame.CopyFrame(*out_frame);
PreprocessFrameAndVerify(resampled_source_frame, cropped_source_frame.width(),
cropped_source_frame.height(), vpm, &out_frame);
WriteProcessedFrameForVisualInspection(resampled_source_frame, *out_frame);
if (out_frame) {
EXPECT_EQ(source_frame.render_time_ms(), out_frame->render_time_ms());
EXPECT_EQ(source_frame.timestamp(), out_frame->timestamp());
}
// If the frame was resampled (scale changed) then:
// (1) verify the new size and write out processed frame for viewing.
// (2) scale the resampled frame (|out_frame|) back to the original size and
// compute PSNR relative to |source_frame| (for automatic verification).
// (3) write out the processed frame for viewing.
if (targetwidth_ != static_cast<int>(sourcewidth_) ||
targetheight_ != static_cast<int>(sourceheight_)) {
// Write the processed frame to file for visual inspection.
std::ostringstream filename;
filename << webrtc::test::OutputPath() << "Resampler_"<< mode << "_" <<
"from_" << sourcewidth_ << "x" << sourceheight_ << "_to_" <<
targetwidth_ << "x" << targetheight_ << "_30Hz_P420.yuv";
std::cout << "Watch " << filename.str() << " and verify that it is okay."
<< std::endl;
FILE* stand_alone_file = fopen(filename.str().c_str(), "wb");
if (PrintI420VideoFrame(*out_frame, stand_alone_file) < 0) {
fprintf(stderr, "Failed to write frame for scaling to width/height: "
" %d %d \n", targetwidth_, targetheight_);
return;
}
fclose(stand_alone_file);
I420VideoFrame resampled_source_frame;
resampled_source_frame.CopyFrame(*out_frame);
// Scale |resampled_source_frame| back to original/source size.
ASSERT_EQ(VPM_OK, vpm->SetTargetResolution(sourcewidth_,
sourceheight_,
30));
ASSERT_EQ(VPM_OK, vpm->PreprocessFrame(resampled_source_frame,
&out_frame));
// Write the processed frame to file for visual inspection.
std::ostringstream filename2;
filename2 << webrtc::test::OutputPath() << "Resampler_"<< mode << "_" <<
"from_" << targetwidth_ << "x" << targetheight_ << "_to_" <<
sourcewidth_ << "x" << sourceheight_ << "_30Hz_P420.yuv";
std::cout << "Watch " << filename2.str() << " and verify that it is okay."
<< std::endl;
stand_alone_file = fopen(filename2.str().c_str(), "wb");
if (PrintI420VideoFrame(*out_frame, stand_alone_file) < 0) {
fprintf(stderr, "Failed to write frame for scaling to width/height "
"%d %d \n", sourcewidth_, sourceheight_);
return;
}
fclose(stand_alone_file);
// Compute the PSNR and check expectation.
double psnr = I420PSNR(&source_frame, out_frame);
EXPECT_GT(psnr, expected_psnr);
printf("PSNR: %f. PSNR is between source of size %d %d, and a modified "
"source which is scaled down/up to: %d %d, and back to source size \n",
psnr, sourcewidth_, sourceheight_, targetwidth_, targetheight_);
}
// Compute PSNR against the cropped source frame and check expectation.
double psnr = I420PSNR(&cropped_source_frame, out_frame);
EXPECT_GT(psnr, expected_psnr);
printf("PSNR: %f. PSNR is between source of size %d %d, and a modified "
"source which is scaled down/up to: %d %d, and back to source size \n",
psnr, source_frame.width(), source_frame.height(),
target_width, target_height);
}
bool CompareFrames(const webrtc::I420VideoFrame& frame1,
@ -360,4 +389,20 @@ bool CompareFrames(const webrtc::I420VideoFrame& frame1,
return true;
}
void WriteProcessedFrameForVisualInspection(const I420VideoFrame& source,
const I420VideoFrame& processed) {
// Write the processed frame to file for visual inspection.
std::ostringstream filename;
filename << webrtc::test::OutputPath() << "Resampler_from_" << source.width()
<< "x" << source.height() << "_to_" << processed.width() << "x"
<< processed.height() << "_30Hz_P420.yuv";
std::cout << "Watch " << filename.str() << " and verify that it is okay."
<< std::endl;
FILE* stand_alone_file = fopen(filename.str().c_str(), "wb");
if (PrintI420VideoFrame(processed, stand_alone_file) < 0)
std::cerr << "Failed to write: " << filename.str() << std::endl;
if (stand_alone_file)
fclose(stand_alone_file);
}
} // namespace webrtc