avcodec: update audio encoder to use ch_layout for channel ordering

It was introduced in 2022-03-15 - lavc 59.24.100 /lavu 57.24.100 , and channel_layout was deprecated and will be removed at some point.

One alternative with new API set would be just to set custom order, so we wouldn't need to reorder channels in vlc end, but I decided to go with smaller changes.

I tested this with 7.1 channel mp4 file for channel testing, checked with audacity on audio, encoded with ffmpeg and vlc and checked audio output with audacity to compare. Also tested that from 7.1 to stereo worked.

changed milestone to %4.0

added Component::Decoders label

added MRStatus::InReview label

added 5 commits

• 8b0bbc88...5df262a4 - 4 commits from branch videolan:master
• 8011c9be - avcodec: update encoder to use ch_layout for channel ordering

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added 4 commits

• c7cceca6 - 1 commit from branch videolan:master
• 68860b84 - avcodec: use p_enc audio channels instead of context channels
• 60d4a7df - avcodec: add handling of new ch_layout
• 6bc1381d - avcodec: use ch_layout for channel layout

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added 3 commits

• d860eda7 - avcodec: use p_enc audio channels instead of context channels in encoder
• 06b52f62 - avcodec: add handling of new ch_layout in audio encoder
• ded4dab1 - avcodec: use ch_layout for channel layout in audio encoder

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approved this merge request

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We should have the same thing for the audio decoder which is currently using p_context->channels and p_context->channel_layout.

resolved all threads

mentioned in merge request !3872 (merged)

approved this merge request

added MRStatus::Accepted label and removed MRStatus::Acceptable label

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added 38 commits

• ded4dab1...8b96a63e - 35 commits from branch videolan:master
• 4681be5c - avcodec: use p_enc audio channels instead of context channels in encoder
• 062e1b55 - avcodec: add handling of new ch_layout in audio encoder
• f6de0693 - avcodec: use ch_layout for channel layout in audio encoder

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