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May 6, 2025
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codec strings definition #74

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20 changes: 20 additions & 0 deletions readme/apv_isobmff.md
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Expand Up @@ -187,3 +187,23 @@ else {
~~~~

tile_index for sub-samples based on tiles, this parameter indicates the tile index in raster order in a frame.

# Sub-parameters for the MIME tyype 'codecs' parameter

When the 'codecs' parameter of a MIME type is used for a track containing APV bistream, as defined in IETF RFC 6381, the sub-parameters defined in this section is used.

The 'codecs' parameter string for the APV bitstream is defined as follows:

~~~
<4CC value of sample entry>.<key1><value1>.<key2><value2>.��.<keyN><valueN>
~~~

The keys are defined as 4CC values and the value used for each keys are defined in the table below.

|Key|Meaning|Value|
|:-:|:-:|:-:|
|'apvf'| profile | the largest value of the profile_idc in APVDecoderConfigurationRecord |
|'apvl'| level | the largest value of the level_idc in APVDecoderConfigurationRecord |
|'apvb'| band | the largest value of the band_idc in APVDecoderConfigurationRecord |

For example, codecs="apv1.apvf44.apvl210.apvb3" indicates the track is compliant to 'apv1' sample entry type and the largest value of the profile in APVDecoderConfigurationRecord of the track is 422-12 profile, the level is 7 and the band is 3.