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https://github.com/mollyim/webrtc.git
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7dad255ce1
Update the output pixel format to the client supplied format when starting camera capture. Also add a new API method to get the preferred output pixel format according to the AVCaptureVideoDataOutput#availableVideoCVPixelFormatTypes method and use it in AppRTCMobile. Bug: webrtc:8505 Change-Id: Ia24eaf91d70d0703a34d38b06bb6eea28fb922b8 Reviewed-on: https://webrtc-review.googlesource.com/22680 Commit-Queue: Anders Carlsson <andersc@webrtc.org> Reviewed-by: Zeke Chin <tkchin@webrtc.org> Reviewed-by: Magnus Jedvert <magjed@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20697}
103 lines
3.1 KiB
Objective-C
103 lines
3.1 KiB
Objective-C
/*
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* Copyright 2017 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#import "ARDCaptureController.h"
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#import "ARDSettingsModel.h"
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#import "WebRTC/RTCLogging.h"
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@implementation ARDCaptureController {
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RTCCameraVideoCapturer *_capturer;
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ARDSettingsModel *_settings;
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BOOL _usingFrontCamera;
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}
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- (instancetype)initWithCapturer:(RTCCameraVideoCapturer *)capturer
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settings:(ARDSettingsModel *)settings {
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if ([super init]) {
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_capturer = capturer;
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_settings = settings;
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_usingFrontCamera = YES;
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}
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return self;
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}
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- (void)startCapture {
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AVCaptureDevicePosition position =
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_usingFrontCamera ? AVCaptureDevicePositionFront : AVCaptureDevicePositionBack;
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AVCaptureDevice *device = [self findDeviceForPosition:position];
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AVCaptureDeviceFormat *format = [self selectFormatForDevice:device];
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if (format == nil) {
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RTCLogError(@"No valid formats for device %@", device);
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NSAssert(NO, @"");
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return;
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}
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NSInteger fps = [self selectFpsForFormat:format];
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[_capturer startCaptureWithDevice:device format:format fps:fps];
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}
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- (void)stopCapture {
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[_capturer stopCapture];
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}
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- (void)switchCamera {
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_usingFrontCamera = !_usingFrontCamera;
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[self startCapture];
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}
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#pragma mark - Private
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- (AVCaptureDevice *)findDeviceForPosition:(AVCaptureDevicePosition)position {
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NSArray<AVCaptureDevice *> *captureDevices = [RTCCameraVideoCapturer captureDevices];
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for (AVCaptureDevice *device in captureDevices) {
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if (device.position == position) {
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return device;
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}
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}
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return captureDevices[0];
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}
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- (AVCaptureDeviceFormat *)selectFormatForDevice:(AVCaptureDevice *)device {
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NSArray<AVCaptureDeviceFormat *> *formats =
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[RTCCameraVideoCapturer supportedFormatsForDevice:device];
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int targetWidth = [_settings currentVideoResolutionWidthFromStore];
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int targetHeight = [_settings currentVideoResolutionHeightFromStore];
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AVCaptureDeviceFormat *selectedFormat = nil;
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int currentDiff = INT_MAX;
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for (AVCaptureDeviceFormat *format in formats) {
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CMVideoDimensions dimension = CMVideoFormatDescriptionGetDimensions(format.formatDescription);
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FourCharCode pixelFormat = CMFormatDescriptionGetMediaSubType(format.formatDescription);
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int diff = abs(targetWidth - dimension.width) + abs(targetHeight - dimension.height);
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if (diff < currentDiff) {
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selectedFormat = format;
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currentDiff = diff;
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} else if (diff == currentDiff && pixelFormat == [_capturer preferredOutputPixelFormat]) {
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selectedFormat = format;
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}
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}
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return selectedFormat;
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}
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- (NSInteger)selectFpsForFormat:(AVCaptureDeviceFormat *)format {
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Float64 maxFramerate = 0;
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for (AVFrameRateRange *fpsRange in format.videoSupportedFrameRateRanges) {
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maxFramerate = fmax(maxFramerate, fpsRange.maxFrameRate);
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}
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return maxFramerate;
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}
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@end
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