objective-c – AVCaptureVideoDataOutput和AVCaptureAudioDataOutput的委托

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 *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
       fromConnection:(AVCaptureConnection *)connection
{
    NSLog(@"VideoDataOutputDelegate = %@",captureOutput);
}    
@end

@implementation AVCamRecorder (AudioDataOutputDelegate)
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(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 *)captureOutput
didOutputSampleBuffer:(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.

objective-c – AVCaptureVideoDataOutput和AVCaptureAudioDataOutput的委托

解决方法

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