objective-c – AVCaptureVideoDataOutput和AVCaptureAudioDataOutput的委托

概述我尝试从AVCaptureVideoDataOutput和AVCaptureAudioDataOutput获取CMSampleBufferRef. AVCamRecorder.h #import <AVFoundation/AVFoundation.h>@interface AVCamRecorder : NSObject {} @property (nonatomic,retain 我尝试从AVCaptureVIDeoDataOutput和AVCaptureAudioDataOutput获取CMSampleBufferRef.

AVCamRecorder.h

#import <AVFoundation/AVFoundation.h>@interface AVCamRecorder : NSObject {}    @property (nonatomic,retain) AVCaptureVIDeoDataOutput *vIDeoDataOutput;    @property (nonatomic,retain) AVCaptureAudioDataOutput *audioDataOutput;@end

AVCamRecorder.m

#import "AVCamRecorder.h"#import <AVFoundation/AVFoundation.h>@interface AVCamRecorder (VIDeoDataOutputDelegate) <AVCaptureVIDeoDataOutputSampleBufferDelegate>@end@interface AVCamRecorder (AudioDataOutputDelegate) <AVCaptureAudioDataOutputSampleBufferDelegate>@end-(ID)initWithSession:(AVCaptureSession *)aSession{    self = [super init];    if (self != nil) {        //AudioDataoutput        AVCaptureAudioDataOutput *aAudioDataOutput =  [[AVCaptureAudioDataOutput alloc] init];        //VIDeoDataoutput        AVCaptureVIDeoDataOutput *aMovIEDataOutput = [[AVCaptureVIDeoDataOutput alloc] init];        if ([aSession canAddOutput:aAudioDataOutput]) {            [aSession addOutput:aAudioDataOutput];        }                if ([aSession canAddOutput:aMovIEDataOutput]) {        [aSession addOutput:aMovIEDataOutput];        }        [aAudioDataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];        [aMovIEDataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];        [self setAudioDataOutput:aAudioDataOutput];        [self setVIDeoDataOutput:aMovIEDataOutput];        [self setSession:aSession];    }    return self;}@implementation AVCamRecorder (VIDeoDataOutputDelegate)- (voID)captureOutput:(AVCaptureOutput *)captureOutputdIDOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer       fromConnection:(AVCaptureConnection *)connection{    NSLog(@"VIDeoDataOutputDelegate = %@",captureOutput);}    @end@implementation AVCamRecorder (AudioDataOutputDelegate)- (voID)captureOutput:(AVCaptureOutput *)captureOutputdIDOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer       fromConnection:(AVCaptureConnection *)connection{    NSLog(@"AudioDataOutputDelegate = %@",captureOutput);}@end

奇怪的是,我在“@implementation AVCamRecorder(AudioDataOutputDelegate)”中获得了视频数据.

AudioDataOutputDelegate = <AVCaptureVIDeoDataOutput: 0x208a7df0>

我切换了“@implementation AVCamRecorder(VIDeoDataOutputDelegate)”和“@implementation AVCamRecorder(VIDeoDataOutputDelegate)”的顺序,我得到了

VIDeoDataOutputDelegate = <AVCaptureVIDeoDataOutput: 0x208a7df0>

似乎我无法设置2“captureOutput：dIDOutputSampleBuffer：fromConnection：”.否则,数据进入任何一个.

或者,我是否错误地设置了“@implementation AVCamRecorder(VIDeoDataOutputDelegate)”和“@implementation AVCamRecorder(AudioDataOutputDelegate)”？

我想我不需要单独回调,但我只是想知道出了什么问题.

提前谢谢你的帮助.

解决方法 您已在同一个类中定义了两个类别

AVCamRecorder (VIDeoDataOutputDelegate)AVCamRecorder (AudioDataOutputDelegate)

声明相同的方法

- (voID)captureOutput:(AVCaptureOutput *)captureOutputdIDOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer       fromConnection:(AVCaptureConnection *)connection;

这导致未定义的行为.请参阅“使用Objective-C编程”指南中的Avoid Category Method Name Clashes：

If the name of a method declared in a category is the same as a method
in the original class,or a method in another category on the same
class (or even a superclass),the behavior is undefined as to which
method implementation is used at runtime.
…

所以你的设置无法正常工作.你可以改为

>定义两个单独的类,一个作为音频,一个作为视频代表,>定义一个充当音频视频委托的类类别(并检查调用它的函数的回调方法),>只需将AVCamRecorder本身用作音频视频代表.

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