这个类提供了对于音频文件的描述An audio stream is a continuous series of data that represents a sound, such as a song.A channel is a discrete track of monop ...
这个类提供了对于音频文件的描述
An audio stream is a continuous series of data that represents a sound, such as a song.
A channel is a discrete track of monophonic audio. A monophonic stream has one channel; a stereo stream has two channels.
A sample is single numerical value for a single audio channel in an audio stream.
A frame is a collection of time-coincident samples. For instance, a linear PCM stereo sound file has two samples per frame, one for the left channel and one for the right channel.
A packet is a collection of one or more contiguous frames. A packet defines the smallest meaningful set of frames for a given audio data format, and is the smallest data unit for which time can be measured. In linear PCM audio, a packet holds a single frame. In compressed formats, it typically holds more; in some formats, the number of frames per packet varies.
The sample rate for a stream is the number of frames per second of uncompressed (or, for compressed formats, the equivalent in decompressed) audio.
首先，音频文件的产生是模拟信号->PCM以后的数字信号->压缩、编码以后的音频文件。
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原标题：iOS音频开发之`AudioStreamBasicDescription`
关键词：IOS
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