//
// 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