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Reland of Add ability to scale to arbitrary factors (patchset #1 id:1 of https://codereview.webrtc.org/2557323002/ )

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Reason for revert:
There was a bug in the implementation where the adapter could get stuck at really low resolutions. That has now been fixed.

Original issue's description:
> Revert of Add ability to scale to arbitrary factors (patchset #7 id:120001 of https://codereview.webrtc.org/2555483005/ )
>
> Reason for revert:
> Issue discovered with scaling back up.
>
> Original issue's description:
> > Add ability to scale to arbitrary factors
> >
> > This CL adds a fallback for the case when no optimized scale factor produces a low enough resolution for what was requested. It also ensures that all resolutions provided by the video adapter are divisible by four. This is required by some hardware implementations.
> >
> > BUG=webrtc:6837
> >
> > Committed: https://crrev.com/710c335d785b104bda4a912bd7909e4d27f9b04f
> > Cr-Commit-Position: refs/heads/master@{#15469}
>
> TBR=magjed@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:6837
>
> Committed: https://crrev.com/7722a4cc8d31e5e924e9e6c5c97412ce8bbbe59d
> Cr-Commit-Position: refs/heads/master@{#15470}

R=magjed@webrtc.org
BUG=webrtc:6837,webrtc:6848

Review-Url: https://codereview.webrtc.org/2558243003
Cr-Commit-Position: refs/heads/master@{#15485}
This commit is contained in:
kthelgason
2016-12-08 08:04:51 -08:00
committed by Commit bot
parent 7dada5e4c0
commit c8474178d6
6 changed files with 136 additions and 95 deletions
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5
webrtc/media/base/adaptedvideotracksource.cc
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@ -16,6 +16,11 @@ AdaptedVideoTrackSource::AdaptedVideoTrackSource() {
thread_checker_.DetachFromThread();
}
AdaptedVideoTrackSource::AdaptedVideoTrackSource(int required_alignment)
: video_adapter_(required_alignment) {
thread_checker_.DetachFromThread();
}
bool AdaptedVideoTrackSource::GetStats(Stats* stats) {
rtc::CritScope lock(&stats_crit_);

3
webrtc/media/base/adaptedvideotracksource.h
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@ -28,6 +28,9 @@ class AdaptedVideoTrackSource
AdaptedVideoTrackSource();
protected:
// Allows derived classes to initialize |video_adapter_| with a custom
// alignment.
AdaptedVideoTrackSource(int required_alignment);
// Checks the apply_rotation() flag. If the frame needs rotation, and it is a
// plain memory frame, it is rotated. Subclasses producing native frames must
// handle apply_rotation() themselves.

150
webrtc/media/base/videoadapter.cc
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@ -11,116 +11,73 @@
#include "webrtc/media/base/videoadapter.h"
#include <algorithm>
#include <cmath>
#include <cstdlib>
#include <limits>
#include "webrtc/base/arraysize.h"
#include "webrtc/base/checks.h"
#include "webrtc/base/logging.h"
#include "webrtc/base/optional.h"
#include "webrtc/media/base/mediaconstants.h"
#include "webrtc/media/base/videocommon.h"
namespace {
struct Fraction {
int numerator;
int denominator;
};
// Scale factors optimized for in libYUV that we accept.
// Must be sorted in decreasing scale factors for FindScaleLargerThan to work.
const Fraction kScaleFractions[] = {
{1, 1},
{3, 4},
{1, 2},
{3, 8},
{1, 4},
{3, 16},
};
// Round |valueToRound| to a multiple of |multiple|. Prefer rounding upwards,
// but never more than |maxValue|.
int roundUp(int valueToRound, int multiple, int maxValue) {
const int roundedValue = (valueToRound + multiple - 1) / multiple * multiple;
return roundedValue <= maxValue ? roundedValue
: (maxValue / multiple * multiple);
// Round |value_to_round| to a multiple of |multiple|. Prefer rounding upwards,
// but never more than |max_value|.
int roundUp(int value_to_round, int multiple, int max_value) {
const int rounded_value =
(value_to_round + multiple - 1) / multiple * multiple;
return rounded_value <= max_value ? rounded_value
: (max_value / multiple * multiple);
}
Fraction FindScaleLessThanOrEqual(int input_num_pixels, int target_num_pixels) {
float best_distance = std::numeric_limits<float>::max();
Fraction best_scale = {0, 1}; // Default to 0 if nothing matches.
for (const auto& fraction : kScaleFractions) {
const float scale =
fraction.numerator / static_cast<float>(fraction.denominator);
float test_num_pixels = input_num_pixels * scale * scale;
float diff = target_num_pixels - test_num_pixels;
if (diff < 0) {
continue;
}
if (diff < best_distance) {
best_distance = diff;
best_scale = fraction;
if (best_distance == 0) { // Found exact match.
break;
}
// Generates a scale factor that makes |input_num_pixels| smaller or
// larger than |target_num_pixels|, depending on the value of |step_up|.
Fraction FindScale(int input_num_pixels, int target_num_pixels, bool step_up) {
// This function only makes sense for a positive target.
RTC_DCHECK_GT(target_num_pixels, 0);
Fraction best_scale = Fraction{1, 1};
Fraction last_scale = Fraction{1, 1};
const float target_scale =
sqrt(target_num_pixels / static_cast<float>(input_num_pixels));
while (best_scale.numerator > (target_scale * best_scale.denominator)) {
last_scale = best_scale;
if (best_scale.numerator % 3 == 0 && best_scale.denominator % 2 == 0) {
// Multiply by 2/3
best_scale.numerator /= 3;
best_scale.denominator /= 2;
} else {
// Multiply by 3/4
best_scale.numerator *= 3;
best_scale.denominator *= 4;
}
}
if (step_up)
return last_scale;
return best_scale;
}
Fraction FindScaleLargerThan(int input_num_pixels,
int target_num_pixels,
int* resulting_number_of_pixels) {
float best_distance = std::numeric_limits<float>::max();
Fraction best_scale = {1, 1}; // Default to unscaled if nothing matches.
// Default to input number of pixels.
float best_number_of_pixels = input_num_pixels;
for (const auto& fraction : kScaleFractions) {
const float scale =
fraction.numerator / static_cast<float>(fraction.denominator);
float test_num_pixels = input_num_pixels * scale * scale;
float diff = test_num_pixels - target_num_pixels;
if (diff <= 0) {
break;
}
if (diff < best_distance) {
best_distance = diff;
best_scale = fraction;
best_number_of_pixels = test_num_pixels;
}
}
*resulting_number_of_pixels = static_cast<int>(best_number_of_pixels + .5f);
return best_scale;
}
Fraction FindScale(int input_num_pixels,
int max_pixel_count_step_up,
int max_pixel_count) {
// Try scale just above |max_pixel_count_step_up_|.
if (max_pixel_count_step_up > 0) {
int resulting_pixel_count;
const Fraction scale = FindScaleLargerThan(
input_num_pixels, max_pixel_count_step_up, &resulting_pixel_count);
if (resulting_pixel_count <= max_pixel_count)
return scale;
}
// Return largest scale below |max_pixel_count|.
return FindScaleLessThanOrEqual(input_num_pixels, max_pixel_count);
}
} // namespace
namespace cricket {
VideoAdapter::VideoAdapter()
VideoAdapter::VideoAdapter(int required_resolution_alignment)
: frames_in_(0),
frames_out_(0),
frames_scaled_(0),
adaption_changes_(0),
previous_width_(0),
previous_height_(0),
required_resolution_alignment_(required_resolution_alignment),
resolution_request_max_pixel_count_(std::numeric_limits<int>::max()),
resolution_request_max_pixel_count_step_up_(0) {}
step_up_(false) {}
VideoAdapter::VideoAdapter() : VideoAdapter(1) {}
VideoAdapter::~VideoAdapter() {}
@ -167,12 +124,17 @@ bool VideoAdapter::AdaptFrameResolution(int in_width,
// OnOutputFormatRequest and OnResolutionRequest.
int max_pixel_count = resolution_request_max_pixel_count_;
if (requested_format_) {
// TODO(kthelgason): remove the - |step_up_| hack when we change how
// resolution is requested from VideoSourceProxy.
// This is required because we must not scale above the requested
// format so we subtract one when scaling up.
max_pixel_count = std::min(
max_pixel_count, requested_format_->width * requested_format_->height);
max_pixel_count, requested_format_->width * requested_format_->height -
static_cast<int>(step_up_));
}
// Drop the input frame if necessary.
if (max_pixel_count == 0 || !KeepFrame(in_timestamp_ns)) {
if (max_pixel_count <= 0 || !KeepFrame(in_timestamp_ns)) {
// Show VAdapt log every 90 frames dropped. (3 seconds)
if ((frames_in_ - frames_out_) % 90 == 0) {
// TODO(fbarchard): Reduce to LS_VERBOSE when adapter info is not needed
@ -211,22 +173,25 @@ bool VideoAdapter::AdaptFrameResolution(int in_width,
*cropped_height =
std::min(in_height, static_cast<int>(in_width / requested_aspect));
}
// Find best scale factor.
const Fraction scale =
FindScale(*cropped_width * *cropped_height,
resolution_request_max_pixel_count_step_up_, max_pixel_count);
FindScale(*cropped_width * *cropped_height, max_pixel_count, step_up_);
// Adjust cropping slightly to get even integer output size and a perfect
// scale factor.
*cropped_width = roundUp(*cropped_width, scale.denominator, in_width);
*cropped_height = roundUp(*cropped_height, scale.denominator, in_height);
// scale factor. Make sure the resulting dimensions are aligned correctly
// to be nice to hardware encoders.
*cropped_width =
roundUp(*cropped_width,
scale.denominator * required_resolution_alignment_, in_width);
*cropped_height =
roundUp(*cropped_height,
scale.denominator * required_resolution_alignment_, in_height);
RTC_DCHECK_EQ(0, *cropped_width % scale.denominator);
RTC_DCHECK_EQ(0, *cropped_height % scale.denominator);
// Calculate final output size.
*out_width = *cropped_width / scale.denominator * scale.numerator;
*out_height = *cropped_height / scale.denominator * scale.numerator;
RTC_DCHECK_EQ(0, *out_height % required_resolution_alignment_);
RTC_DCHECK_EQ(0, *out_height % required_resolution_alignment_);
++frames_out_;
if (scale.numerator != scale.denominator)
@ -260,10 +225,9 @@ void VideoAdapter::OnResolutionRequest(
rtc::Optional<int> max_pixel_count,
rtc::Optional<int> max_pixel_count_step_up) {
rtc::CritScope cs(&critical_section_);
resolution_request_max_pixel_count_ =
max_pixel_count.value_or(std::numeric_limits<int>::max());
resolution_request_max_pixel_count_step_up_ =
max_pixel_count_step_up.value_or(0);
resolution_request_max_pixel_count_ = max_pixel_count.value_or(
max_pixel_count_step_up.value_or(std::numeric_limits<int>::max()));
step_up_ = static_cast<bool>(max_pixel_count_step_up);
}
} // namespace cricket

5
webrtc/media/base/videoadapter.h
View File

@ -25,6 +25,7 @@ namespace cricket {
class VideoAdapter {
public:
VideoAdapter();
VideoAdapter(int required_resolution_alignment);
virtual ~VideoAdapter();
// Return the adapted resolution and cropping parameters given the
@ -63,6 +64,8 @@ class VideoAdapter {
int adaption_changes_; // Number of changes in scale factor.
int previous_width_; // Previous adapter output width.
int previous_height_; // Previous adapter output height.
// Resolution must be divisible by this factor.
const int required_resolution_alignment_;
// The target timestamp for the next frame based on requested format.
rtc::Optional<int64_t> next_frame_timestamp_ns_ GUARDED_BY(critical_section_);
@ -71,7 +74,7 @@ class VideoAdapter {
// The adapted output format is the minimum of these.
rtc::Optional<VideoFormat> requested_format_ GUARDED_BY(critical_section_);
int resolution_request_max_pixel_count_ GUARDED_BY(critical_section_);
int resolution_request_max_pixel_count_step_up_ GUARDED_BY(critical_section_);
bool step_up_ GUARDED_BY(critical_section_);
// The critical section to protect the above variables.
rtc::CriticalSection critical_section_;

60
webrtc/media/base/videoadapter_unittest.cc
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@ -951,4 +951,64 @@ TEST_F(VideoAdapterTest, TestCroppingOddResolution) {
EXPECT_EQ(69, out_height_);
}
TEST_F(VideoAdapterTest, TestAdaptToVerySmallResolution) {
// Ask for 1920x1080 (16:9 aspect), with 1/16 scaling.
const int w = 1920;
const int h = 1080;
adapter_.OnOutputFormatRequest(VideoFormat(w, h, 0, FOURCC_I420));
adapter_.OnResolutionRequest(rtc::Optional<int>(w * h * 1 / 16 * 1 / 16),
rtc::Optional<int>());
// Send 1920x1080 (16:9 aspect).
EXPECT_TRUE(adapter_.AdaptFrameResolution(
w, h, 0, &cropped_width_, &cropped_height_, &out_width_, &out_height_));
// Instead of getting the exact aspect ratio with cropped resolution 1920x1080
// the resolution should be adjusted to get a perfect scale factor instead.
EXPECT_EQ(1920, cropped_width_);
EXPECT_EQ(1072, cropped_height_);
EXPECT_EQ(120, out_width_);
EXPECT_EQ(67, out_height_);
// Adapt back up one step to 3/32.
adapter_.OnResolutionRequest(rtc::Optional<int>(),
rtc::Optional<int>(w * h * 1 / 16 * 1 / 16));
// Send 1920x1080 (16:9 aspect).
EXPECT_TRUE(adapter_.AdaptFrameResolution(
w, h, 0, &cropped_width_, &cropped_height_, &out_width_, &out_height_));
EXPECT_EQ(180, out_width_);
EXPECT_EQ(99, out_height_);
}
TEST_F(VideoAdapterTest, AdaptFrameResolutionDropWithResolutionRequest) {
VideoFormat output_format = capture_format_;
output_format.width = 0;
output_format.height = 0;
adapter_.OnOutputFormatRequest(output_format);
EXPECT_FALSE(adapter_.AdaptFrameResolution(
capture_format_.width, capture_format_.height, 0,
&cropped_width_, &cropped_height_,
&out_width_, &out_height_));
adapter_.OnResolutionRequest(rtc::Optional<int>(),
rtc::Optional<int>(640 * 480));
// Still expect all frames to be dropped
EXPECT_FALSE(adapter_.AdaptFrameResolution(
capture_format_.width, capture_format_.height, 0,
&cropped_width_, &cropped_height_,
&out_width_, &out_height_));
adapter_.OnResolutionRequest(rtc::Optional<int>(640 * 480 - 1),
rtc::Optional<int>());
// Still expect all frames to be dropped
EXPECT_FALSE(adapter_.AdaptFrameResolution(
capture_format_.width, capture_format_.height, 0,
&cropped_width_, &cropped_height_,
&out_width_, &out_height_));
}
} // namespace cricket

8
webrtc/sdk/android/src/jni/androidvideotracksource.cc
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@ -12,13 +12,19 @@
#include <utility>
namespace {
// MediaCodec wants resolution to be divisible by 2.
const int kRequiredResolutionAlignment = 2;
}
namespace webrtc {
AndroidVideoTrackSource::AndroidVideoTrackSource(rtc::Thread* signaling_thread,
JNIEnv* jni,
jobject j_egl_context,
bool is_screencast)
: signaling_thread_(signaling_thread),
: AdaptedVideoTrackSource(kRequiredResolutionAlignment),
signaling_thread_(signaling_thread),
surface_texture_helper_(webrtc_jni::SurfaceTextureHelper::create(
jni,
"Camera SurfaceTextureHelper",