ES Format 介紹
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Elementary stream
An elementary stream (ES) as defined by the MPEG communication protocol is usually the output of an audio or video encoder. ES contains only one kind of data, e.g. audio, video or closed caption. An elementary stream is often referred to as "elementary", "data", "audio", or "video" bitstreams or streams. The format of the elementary stream depends upon the codec or data carried in the stream, but will often carry a common header when packetized into a packetized elementary stream.
Contents
[hide]- 1Header for MPEG-2 video elementary stream
- 2General layout of MPEG-1 audio elementary stream
- 3See also
- 4External links
Header for MPEG-2 video elementary stream[edit]
General layout of MPEG-1 audio elementary stream[edit]
The digitized sound signal is divided up into blocks of 384 samples in Layer I and 1152 samples in Layers II and III. The sound sample block is encoded within an audio frame:
- header
- error check
- audio data
- ancillary data
The header of a frame contains general information such as the MPEG Layer, the sampling frequency, the number of channels, whether the frame is CRC protected, whether the sound is the original:
'1'=Not Protectedbit rate index4 sampling frequency2kHz '00'=44.1 '01'=48 '10'=32padding1 private1 mode2'00'=Stereo '01'=joint stereo '10'=dual channel '11'=single channelmode extension2 copyright10=none 1=yesoriginal or copy10=copy 1=originalemphasis2
Although most of this information may be the same for all frames, MPEG decided to give each audio frame such a header in order to simplify synchronization and bitstream editing.
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