Resolve "Crash possible in Encoding of TNS Data for MDCT-Stereo core"
Reason why this change is needed
- Crash in TNS entropy coding
Description of the change
- In case the order is reduced to 0 in both channels, switch off the TNS coding completely
Affected operating points
- Describe here as well as possible what operating points are affected and how
- In minimum, there should be a status for bitstream compatibility and output bit exactness
- For bitstream compatibility, the following levels are helpful for describing encoder
- Produced bitstream is BE compared to previous state.
- Produced bitstream is non-BE but it is fully backwards compatible for decoding. Decoded output may differ.
- Produced bitstream is non-BC. Old decoder cannot decode the produced bitstream correctly.
- For output difference, use BE or non-BE. Additionally, amount of difference can be presented.
Related to #1349