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/*
* Copyright 2017 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.
*/
#import "RTCEncodedImage+Private.h"
#import <objc/runtime.h>
#include "rtc_base/numerics/safe_conversions.h"
namespace {
// An implementation of EncodedImageBufferInterface that doesn't perform any copies.
class ObjCEncodedImageBuffer : public webrtc::EncodedImageBufferInterface {
public:
static rtc::scoped_refptr<ObjCEncodedImageBuffer> Create(NSData *data) {
return rtc::make_ref_counted<ObjCEncodedImageBuffer>(data);
}
const uint8_t *data() const override { return static_cast<const uint8_t *>(data_.bytes); }
// TODO(bugs.webrtc.org/9378): delete this non-const data method.
uint8_t *data() override {
return const_cast<uint8_t *>(static_cast<const uint8_t *>(data_.bytes));
}
size_t size() const override { return data_.length; }
protected:
explicit ObjCEncodedImageBuffer(NSData *data) : data_(data) {}
~ObjCEncodedImageBuffer() {}
NSData *data_;
};
}
// A simple wrapper around webrtc::EncodedImageBufferInterface to make it usable with associated
// objects.
@interface RTCWrappedEncodedImageBuffer : NSObject
@property(nonatomic) rtc::scoped_refptr<webrtc::EncodedImageBufferInterface> buffer;
- (instancetype)initWithEncodedImageBuffer:
(rtc::scoped_refptr<webrtc::EncodedImageBufferInterface>)buffer;
@end
@implementation RTCWrappedEncodedImageBuffer
@synthesize buffer = _buffer;
- (instancetype)initWithEncodedImageBuffer:
(rtc::scoped_refptr<webrtc::EncodedImageBufferInterface>)buffer {
self = [super init];
if (self) {
_buffer = buffer;
}
return self;
}
@end
@implementation RTC_OBJC_TYPE (RTCEncodedImage)
(Private)
- (rtc::scoped_refptr<webrtc::EncodedImageBufferInterface>)encodedData {
RTCWrappedEncodedImageBuffer *wrappedBuffer =
objc_getAssociatedObject(self, @selector(encodedData));
return wrappedBuffer.buffer;
}
- (void)setEncodedData:(rtc::scoped_refptr<webrtc::EncodedImageBufferInterface>)buffer {
return objc_setAssociatedObject(
self,
@selector(encodedData),
[[RTCWrappedEncodedImageBuffer alloc] initWithEncodedImageBuffer:buffer],
OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (instancetype)initWithNativeEncodedImage:(const webrtc::EncodedImage &)encodedImage {
if (self = [super init]) {
// A reference to the encodedData must be stored so that it's kept alive as long
// self.buffer references its underlying data.
self.encodedData = encodedImage.GetEncodedData();
// Wrap the buffer in NSData without copying, do not take ownership.
self.buffer = [NSData dataWithBytesNoCopy:self.encodedData->data()
length:encodedImage.size()
freeWhenDone:NO];
self.encodedWidth = rtc::dchecked_cast<int32_t>(encodedImage._encodedWidth);
self.encodedHeight = rtc::dchecked_cast<int32_t>(encodedImage._encodedHeight);
self.timeStamp = encodedImage.RtpTimestamp();
self.captureTimeMs = encodedImage.capture_time_ms_;
self.ntpTimeMs = encodedImage.ntp_time_ms_;
self.flags = encodedImage.timing_.flags;
self.encodeStartMs = encodedImage.timing_.encode_start_ms;
self.encodeFinishMs = encodedImage.timing_.encode_finish_ms;
self.frameType = static_cast<RTCFrameType>(encodedImage._frameType);
self.rotation = static_cast<RTCVideoRotation>(encodedImage.rotation_);
self.qp = @(encodedImage.qp_);
self.contentType = (encodedImage.content_type_ == webrtc::VideoContentType::SCREENSHARE) ?
RTCVideoContentTypeScreenshare :
RTCVideoContentTypeUnspecified;
}
return self;
}
- (webrtc::EncodedImage)nativeEncodedImage {
// Return the pointer without copying.
webrtc::EncodedImage encodedImage;
if (self.encodedData) {
encodedImage.SetEncodedData(self.encodedData);
} else if (self.buffer) {
encodedImage.SetEncodedData(ObjCEncodedImageBuffer::Create(self.buffer));
}
encodedImage.set_size(self.buffer.length);
encodedImage._encodedWidth = rtc::dchecked_cast<uint32_t>(self.encodedWidth);
encodedImage._encodedHeight = rtc::dchecked_cast<uint32_t>(self.encodedHeight);
encodedImage.SetRtpTimestamp(self.timeStamp);
encodedImage.capture_time_ms_ = self.captureTimeMs;
encodedImage.ntp_time_ms_ = self.ntpTimeMs;
encodedImage.timing_.flags = self.flags;
encodedImage.timing_.encode_start_ms = self.encodeStartMs;
encodedImage.timing_.encode_finish_ms = self.encodeFinishMs;
encodedImage._frameType = webrtc::VideoFrameType(self.frameType);
encodedImage.rotation_ = webrtc::VideoRotation(self.rotation);
encodedImage.qp_ = self.qp ? self.qp.intValue : -1;
encodedImage.content_type_ = (self.contentType == RTCVideoContentTypeScreenshare) ?
webrtc::VideoContentType::SCREENSHARE :
webrtc::VideoContentType::UNSPECIFIED;
return encodedImage;
}
@end