正确修剪 ByteArray 中的 PCM 数据

发布于 2024-09-03 11:01:31 字数 547 浏览 8 评论 0原文

我遇到一种情况，需要从录制剪辑的开头修剪少量音频（通常在 110-150 毫秒之间，这是一个不一致的量）。

我以 44100 频率和 16 比特率进行录制。这是我正在使用的代码：

public function get trimmedData():ByteArray {
        var ba:ByteArray = new ByteArray();
        var bitPosition:uint = 44100 * 16 * (recordGap / 1000);
        bitPosition -= int(bitPosition % 16); //should keep snapped to nearest sample, I hope
        ba.writeBytes(_rawData, (bitPosition / 8));
        return ba;
    }

这似乎在时间上有效，但所有录制的音频都变得静态和粗糙。我的四舍五入有问题吗？这是我第一次需要更改原始 PCM 数据，因此我不确定它的详细信息。

谢谢！

原文

I have a situation where I need to trim a small amount of audio from the beginning of a recorded clip (generally somewhere between 110-150ms, it is an inconsistent amount).

I'm recording in 44100 frequency and 16 bitrate. This is the code I'm using:

public function get trimmedData():ByteArray {
        var ba:ByteArray = new ByteArray();
        var bitPosition:uint = 44100 * 16 * (recordGap / 1000);
        bitPosition -= int(bitPosition % 16); //should keep snapped to nearest sample, I hope
        ba.writeBytes(_rawData, (bitPosition / 8));
        return ba;
    }

This seems to work time-wise, but all the recorded audio gets staticy and gross. Is something off about my rounding? This is the first time I've needed to alter raw PCM data so I'm not sure about the finer details of it.

Thanks!

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