public unowned string? get_level (uint8 audio_config)
Determines the level of a stream as defined in ISO/IEC 14496-3.
For AAC LC streams, the constraints from the AAC audio profile are applied. For AAC Main, LTP, SSR and others, the Main profile is used.
audio_config parameter follows the following format, starting from the most significant bit of the first byte:
* Bit 0:4 contains the AudioObjectType (if this is 0x5, then the real AudioObjectType is carried after the rate and channel data) * Bit 5:8 contains the sample frequency index (if this is 0xf, then the next 24 bits define the actual sample frequency, and subsequent fields are appropriately shifted). * Bit 9:12 contains the channel configuration
a pointer to the AudioSpecificConfig as specified in the Elementary Stream Descriptor (esds) in ISO/IEC 14496-1.
The level as a const string and