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Clarify apv sample format #72

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Merged
cpncf merged 3 commits into from
May 5, 2025
Merged

Clarify apv sample format #72

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3af4078
clarification of APV sample format
kpchoi May 5, 2025
e9a0edd
removed 'sample_size' loop
kpchoi May 5, 2025
ebd3e2a
clarification more
kpchoi May 5, 2025
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15 changes: 14 additions & 1 deletion readme/apv_isobmff.md
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Expand Up @@ -159,7 +159,20 @@ the full_range_flag field in the frame header of the frames whose value of the p
## APV Sample Description

### Format of sample
When APV coded bitstream is encapsulated in a track with APVSamspleEntry, each sample shall contain one and only one access unit of APV coded data
When APV coded bitstream is encapsulated in a track with APVSampleEntry, each sample shall contain a size of access unit and an access unit of APV coded data.

~~~~
aligned(8) class APVSample{
unsigned int(32) au_length;
bit(au_length * 8) access_unit;
}
~~~~

+ au_length
> indicates the size of an access unit measured in bytes. The size does not include the length field itself.

+ access_unit
> contains a single access unit. It includes both the 4-characters signature and the variable length encapsulated PBU streams.

### Sync sample
Every samples of APV bitstream shall be sync samples.
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