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Use a CopyOnWriteBuffer to back EncodedImage data

Browse source 
Intended to make copy construction and assignment of EncodedImage
cheaper, but otherwise not have any effect on users of the class.

Bug: webrtc:9378, chromium:931692
Change-Id: I22cf8c05f6ef7b7b5cf7ef08fd0dfc5c61211196
Reviewed-on: https://webrtc-review.googlesource.com/c/123442
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26760}
This commit is contained in:
Niels Möller 2019-02-19 15:42:15 +01:00 committed by Commit Bot
parent 0d4869c2b9
commit cc26fef5b2
3 changed files with 10 additions and 6 deletions
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5
api/video/DEPS
View file

@ -6,6 +6,11 @@ specific_include_rules = {
"+modules/video_coding/encoded_frame.h",
],
# Used for a private member variable.
"encoded_image\.h": [
"+rtc_base/copy_on_write_buffer.h",
],
"i010_buffer\.h": [
"+rtc_base/memory/aligned_malloc.h",
],

3
api/video/encoded_image.cc
View file

@ -42,8 +42,7 @@ EncodedImage& EncodedImage::operator=(const EncodedImage&) = default;
void EncodedImage::Retain() {
if (buffer_) {
encoded_data_ = std::vector<uint8_t>(size_);
memcpy(encoded_data_.data(), buffer_, size_);
encoded_data_.SetData(buffer_, size_);
buffer_ = nullptr;
}
}

8
api/video/encoded_image.h
View file

@ -12,7 +12,6 @@
#define API_VIDEO_ENCODED_IMAGE_H_
#include <stdint.h>
#include <vector>
#include "absl/types/optional.h"
#include "api/video/color_space.h"
@ -23,6 +22,7 @@
#include "api/video/video_timing.h"
#include "common_types.h" // NOLINT(build/include)
#include "rtc_base/checks.h"
#include "rtc_base/copy_on_write_buffer.h"
#include "rtc_base/system/rtc_export.h"
namespace webrtc {
@ -88,13 +88,13 @@ class RTC_EXPORT EncodedImage {
}
void Allocate(size_t capacity) {
encoded_data_.resize(capacity);
encoded_data_.SetSize(capacity);
buffer_ = nullptr;
}
uint8_t* data() { return buffer_ ? buffer_ : encoded_data_.data(); }
const uint8_t* data() const {
return buffer_ ? buffer_ : encoded_data_.data();
return buffer_ ? buffer_ : encoded_data_.cdata();
}
// TODO(nisse): At some places, code accepts a const ref EncodedImage, but
// still writes to it, to clear padding at the end of the encoded data.
@ -141,7 +141,7 @@ class RTC_EXPORT EncodedImage {
private:
// TODO(bugs.webrtc.org/9378): We're transitioning to always owning the
// encoded data.
std::vector<uint8_t> encoded_data_;
rtc::CopyOnWriteBuffer encoded_data_;
size_t size_; // Size of encoded frame data.
// Non-null when used with an un-owned buffer.
uint8_t* buffer_;