关于audio各结构说明摘录
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AudioStreamBasicDescription:
In audio data a frame is one sample across all channels. In non-interleaved
audio, the per frame fields identify one channel. In interleaved audio, the per
frame fields identify the set of n channels. In uncompressed audio, a Packet is
one frame, (mFramesPerPacket == 1). In compressed audio, a Packet is an
indivisible chunk of compressed data, for example an AAC packet will contain
1024 sample frames.
AudioStreamBasicDescription flags:
@discussion Typically, when an ASBD is being used, the fields describe the complete layout
of the sample data in the buffers that are represented by this description -
where typically those buffers are represented by an AudioBuffer that is
contained in an AudioBufferList.
However, when an ASBD has the kAudioFormatFlagIsNonInterleaved flag, the
AudioBufferList has a different structure and semantic. In this case, the ASBD
fields will describe the format of ONE of the AudioBuffers that are contained in
the list, AND each AudioBuffer in the list is determined to have a single (mono)
channel of audio data. Then, the ASBD's mChannelsPerFrame will indicate the
total number of AudioBuffers that are contained within the AudioBufferList -
where each buffer contains one channel. This is used primarily with the
AudioUnit (and AudioConverter) representation of this list - and won't be found
in the AudioHardware usage of this structure.
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