相关疑难解决方法(0)

我正在努力编码从AVCaptureSession使用中 接收的音频缓冲区AudioConverter,然后将它们附加到AVAssetWriter.

我没有收到任何错误(包括OSStatus响应),并且CMSampleBuffer生成的 s似乎有有效数据,但生成的文件根本没有任何可播放的音频.当与视频一起写入时,视频帧停止附加几帧(appendSampleBuffer() 返回false,但没有AVAssetWriter.error),可能是因为资产编写者正在等待音频赶上.我怀疑它与我为AAC设置启动的方式有关.

该应用程序使用RxSwift,但我删除了RxSwift部件,以便更容易理解更广泛的受众.

请查看以下代码中的评论以获取更多...评论

给定一个设置结构:

import Foundation
import AVFoundation
import CleanroomLogger

public struct AVSettings {

let orientation: AVCaptureVideoOrientation = .Portrait
let sessionPreset                          = AVCaptureSessionPreset1280x720
let videoBitrate: Int                      = 2_000_000
let videoExpectedFrameRate: Int            = 30
let videoMaxKeyFrameInterval: Int          = 60

let audioBitrate: Int                      = 32 * 1024

/// Settings that are `0` means variable rate.
/// The `mSampleRate` and `mChennelsPerFrame` is overwritten at run-time
/// to values …

我有一些代码创建CMBlockBuffers然后创建一个CMSampleBuffer并将其传递给AVAssetWriterInput.

这里有关于内存管理的优惠吗？根据Apple文档,您在名称中使用"创建"的任何内容都应与CFRelease一起发布.

但是,如果我使用CFRelease,那么我的应用程序将以对象0xblahblah的'malloc:*错误中止:未释放指针被释放.

CMBlockBufferRef tmp_bbuf = NULL;
CMBlockBufferRef bbuf = NULL;
CMSampleBufferRef sbuf = NULL;
status = CMBlockBufferCreateWithMemoryBlock(
                                            kCFAllocatorDefault, 
                                            samples, 
                                            buflen, 
                                            kCFAllocatorDefault, 
                                            NULL, 
                                            0, 
                                            buflen, 
                                            0, 
                                            &tmp_bbuf);

if (status != noErr || !tmp_bbuf) {
    NSLog(@"CMBlockBufferCreateWithMemoryBlock error");
    return -1;
}
// Copy the buffer so that we get a copy of the samples in memory.
// CMBlockBufferCreateWithMemoryBlock does not actually copy the data!
// 
status = CMBlockBufferCreateContiguous(kCFAllocatorDefault, tmp_bbuf, kCFAllocatorDefault, NULL, 0, buflen, kCMBlockBufferAlwaysCopyDataFlag, &bbuf);
//CFRelease(tmp_bbuf); // causes …