profile/level in decoder

ranchu

Guru 20755 points

Hello,

According to H.264 decoder UG, level API is supported , and profile "always is configured for high profile, independent of value set in this field."
In MPEG-2 and MPEG-4 decoder there is no API for level or profile.
1. Does it mean H.264 decoder will ignore the level in stream and use the level in API ?
2. H.264 decoder support BP,MP,HP, while it said that profile "always is configured for high profile". Isn't there a contradiction here ? Note that BP is not a subset of MP.
3. MPEG-2, MPEG-4 decoders will always use the profile,level from stream ?

Best Regards,

Ran

over 12 years ago

0 Yashwant Dutt over 12 years ago

TI__Genius 17215 points

Ran,

Unlike encoder, decoder does not need the value of profile to be provided from the API.

1 & 2. For TI decoder, HP is the highest profile, even BP is subset of it as we don't support ASP, FMO and RS. Being configured as high profile means it can decode all streams of BP, MP and HP.

2. Yes

regards

Yashwant

0 ranchu over 12 years ago in reply to Yashwant Dutt

Guru 20755 points

Ok, Thanks.

regarind the 1st question, if Does level from API means that codec will ignore level from stream for the decoding ? What is it actually needed for , i.e. why does not it use the level in elementary stream ?

Regards,

Ran

0 Yashwant Dutt over 12 years ago in reply to ranchu

TI__Genius 17215 points

Level information in the API helps codecs to ask memory during its create time for its operation accordingly. For H.264, this is needed(standard mandates that) and hence it is part of API. For Mpeg4, it is not needed and hence API parameter is dont care.

regards

yashwant

0 ranchu over 12 years ago in reply to Yashwant Dutt

Guru 20755 points

Can the level be configured to Highest 5.1, and not care any more during run-time ?

Regards,

Ran

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profile/level in decoder