Function opus_projection_ambisonics_encoder_create 

pub unsafe extern "C" fn opus_projection_ambisonics_encoder_create(
    Fs: opus_int32,
    channels: c_int,
    mapping_family: c_int,
    streams: *mut c_int,
    coupled_streams: *mut c_int,
    application: c_int,
    error: *mut c_int,
) -> *mut OpusProjectionEncoder

Allocates and initializes a projection encoder state. Call opus_projection_encoder_destroy() to release this object when finished. @param Fs opus_int32: Sampling rate of the input signal (in Hz). This must be one of 8000, 12000, 16000, 24000, or 48000. @param channels int: Number of channels in the input signal. This must be at most 255. It may be greater than the number of coded channels (streams + coupled_streams). @param mapping_family int: The mapping family to use for selecting the appropriate projection. @param[out] streams int *: The total number of streams that will be encoded from the input. @param[out] coupled_streams int *: Number of coupled (2 channel) streams that will be encoded from the input. @param application int: The target encoder application. This must be one of the following:

#OPUS_APPLICATION_VOIP

Process signal for improved speech intelligibility.

#OPUS_APPLICATION_AUDIO

Favor faithfulness to the original input.

#OPUS_APPLICATION_RESTRICTED_LOWDELAY

Configure the minimum possible coding delay by disabling certain modes of operation.

@param[out] error int *: Returns #OPUS_OK on success, or an error code (see @ref opus_errorcodes) on failure.