Allow bits_per_coded_sample to codec context.

[rvanlaar]

Overview

Add the option to set bits_per_coded_sample on the codec context.

import av
codec = av.codec.Codec("qtrle", "r").create()
p =  av.Packet()
codec.decode(p)

Results in:

Unsupported colorspace: 0 bits/sample?
---------------------------------------------------------------------------
InvalidDataError                          Traceback (most recent call last)
Cell In[4], line 1
----> 1 codec.decode(p)

File av/codec/context.pyx:509, in av.codec.context.CodecContext.decode()

File av/codec/context.pyx:521, in av.codec.context.CodecContext.decode()

File av/codec/context.pyx:291, in av.codec.context.CodecContext.open()

File av/error.pyx:336, in av.error.err_check()

InvalidDataError: [Errno 1094995529] Invalid data found when processing input; last error log: [qtrle] Unsupported colorspace: 0 bits/sample?

Desired Behavior

codec = av.codec.Codec("qtrle", "r").create()
codec.bits_per_coded_sample = 24

Example API

codec = av.codec.Codec("qtrle", "r").create()
codec.width = 200
codec.height = 200    
codec.bits_per_coded_sample = 24

Additional context

For QuickTime VR movies I want to decode single frames.
This works for RPZA which needs the width and height of a frame.
As shown in #1161 (comment)

The QTRLE decoder also needs to the bits_per_coded_sample. Which is here in the ffmpeg code:
https://github.com/FFmpeg/FFmpeg/blob/5f8c113b75de9c2a7f49e337cd332abbf8adbb6e/libavcodec/qtrle.c#L409

[github-actions]

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