iOS 直播-获取音频(视频)数据

//

//  ViewController.m

//  capture-test

//

//  Created by caoxu on 16/6/3.

//  Copyright © 2016年 caoxu. All rights reserved.

//

#import "ViewController.h"

#import <AVFoundation/AVFoundation.h>

@interface ViewController ()<AVCaptureAudioDataOutputSampleBufferDelegate>

@property (nonatomic, strong) AVCaptureSession * session;

@property (nonatomic, strong) AVCaptureAudioDataOutput *audioOutput;

@property (nonatomic, strong) dispatch_queue_t audioQueue;

@property (nonatomic, strong) AVCaptureConnection *audioConnection;

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    self.session = [[AVCaptureSession alloc]init];

    NSError *error = nil;

    AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];

    AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];

    if (error) {

        NSLog(@"Error getting video input device: %@", error.description);

    }

    if ([self.session canAddInput:audioInput]) {

        [self.session addInput:audioInput];

    }

    // 配置采集输出，即我们取得音频的接口

    self.audioQueue = dispatch_queue_create("Audio Capture Queue", DISPATCH_QUEUE_SERIAL);

    self.audioOutput = [[AVCaptureAudioDataOutput alloc] init];

    [self.audioOutput setSampleBufferDelegate:self queue:self.audioQueue];

    if ([self.session canAddOutput:self.audioOutput]) {

        [self.session addOutput:self.audioOutput];

    }

    // 保存Connection，用于在SampleBufferDelegate中判断数据来源（是Video/Audio？）

    self.audioConnection = [self.audioOutput connectionWithMediaType:AVMediaTypeAudio];

    [self.session startRunning];

}

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection{

    // 这里的sampleBuffer就是采集到的数据了，但它是Video还是Audio的数据，得根据connection来判断

    if (connection == self.audioConnection) {  // Audio

        NSLog(@"%@",sampleBuffer);

        NSLog(@"这里获得audio sampleBuffer，做进一步处理（编码AAC）");

    }

}

@end