Function gstreamer_pbutils::functions::codec_utils_aac_get_level

source · 
pub fn codec_utils_aac_get_level(
    audio_config: &[u8],
) -> Result<GString, BoolError>
Expand description

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.

The 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

§audio_config

a pointer to the AudioSpecificConfig as specified in the Elementary Stream Descriptor (esds) in ISO/IEC 14496-1.

§Returns

The level as a const string and None if the level could not be determined.