ios - 由于 AudioQueueNewInput 使用 fmt 失败,学习核心音频的第 4 章无法正常工作?
<p><p>我正在尝试让 Adamson 和 Avila 的《Learning Core Audio》第 4 章中的录音程序正常工作。手动输入和从informit网站下载的未修改版本都以同样的方式失败。它总是在创建队列时失败。</p>
<pre><code>Error: AudioQueueNewInput failed ('fmt?')
</code></pre>
<p>有没有其他人在 Mavericks 和 XCode5 上尝试过这个示例程序?这是从下载站点到故障点的那个。当我尝试使用一些硬编码参数的 LPCM 时,没关系,但我无法让 MPEG4AAC 工作。似乎 AppleLossless 有效。</p>
<pre><code>// Code from download
int main(int argc, const char *argv[])
{
MyRecorder recorder = {0};
AudioStreamBasicDescription recordFormat = {0};
memset(&recordFormat, 0, sizeof(recordFormat));
// Configure the output data format to be AAC
recordFormat.mFormatID = kAudioFormatMPEG4AAC;
recordFormat.mChannelsPerFrame = 2;
// get the sample rate of the default input device
// we use this to adapt the output data format to match hardware capabilities
MyGetDefaultInputDeviceSampleRate(&recordFormat.mSampleRate);
// ProTip: Use the AudioFormat API to trivialize ASBD creation.
// input: at least the mFormatID, however, at this point we already have
// mSampleRate, mFormatID, and mChannelsPerFrame
// output: the remainder of the ASBD will be filled out as much as possible
// given the information known about the format
UInt32 propSize = sizeof(recordFormat);
CheckError(AudioFormatGetProperty(kAudioFormatProperty_FormatInfo, 0, NULL,
&propSize, &recordFormat), "AudioFormatGetProperty failed");
// create a input (recording) queue
AudioQueueRef queue = {0};
CheckError(AudioQueueNewInput(&recordFormat, // ASBD
MyAQInputCallback, // Callback
&recorder, // user data
NULL, // run loop
NULL, // run loop mode
0, // flags (always 0)
// &recorder.queue), // output: reference to AudioQueue object
&queue),
"AudioQueueNewInput failed");
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我遇到了同样的问题。检查采样率。在您的情况下,它将是巨大的(96000)。只需尝试手动将其设置为 44100。</p></p>
<p style="font-size: 20px;">关于ios - 由于 AudioQueueNewInput 使用 fmt 失败,学习核心音频的第 4 章无法正常工作?,我们在Stack Overflow上找到一个类似的问题:
<a href="https://stackoverflow.com/questions/23145345/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/23145345/
</a>
</p>
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