opus_genericctls

Section: Opus (3)
Updated: Tue Jan 26 2021
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NAME

opus_genericctls - Generic CTLs

- These macros are used with the opus_decoder_ctl and opus_encoder_ctl calls to generate a particular request.

SYNOPSIS

Macros

#define OPUS_RESET_STATE
Resets the codec state to be equivalent to a freshly initialized state.
#define OPUS_GET_FINAL_RANGE(x)
Gets the final state of the codec's entropy coder.
#define OPUS_GET_BANDWIDTH(x)
Gets the encoder's configured bandpass or the decoder's last bandpass.
#define OPUS_GET_SAMPLE_RATE(x)
Gets the sampling rate the encoder or decoder was initialized with.
#define OPUS_SET_PHASE_INVERSION_DISABLED(x)
If set to 1, disables the use of phase inversion for intensity stereo, improving the quality of mono downmixes, but slightly reducing normal stereo quality.
#define OPUS_GET_PHASE_INVERSION_DISABLED(x)
Gets the encoder's configured phase inversion status.
#define OPUS_GET_IN_DTX(x)
Gets the DTX state of the encoder.

Detailed Description

These macros are used with the opus_decoder_ctl and opus_encoder_ctl calls to generate a particular request.

When called on an OpusDecoder they apply to that particular decoder instance. When called on an OpusEncoder they apply to the corresponding setting on that encoder instance, if present.

Some usage examples:

int ret;
opus_int32 pitch;
ret = opus_decoder_ctl(dec_ctx, OPUS_GET_PITCH(&pitch));
if (ret == OPUS_OK) return ret;

opus_encoder_ctl(enc_ctx, OPUS_RESET_STATE);
opus_decoder_ctl(dec_ctx, OPUS_RESET_STATE);

opus_int32 enc_bw, dec_bw;
opus_encoder_ctl(enc_ctx, OPUS_GET_BANDWIDTH(&enc_bw));
opus_decoder_ctl(dec_ctx, OPUS_GET_BANDWIDTH(&dec_bw));
if (enc_bw != dec_bw) {
  printf("packet bandwidth mismatch!);
}

See also

: Opus Encoder, opus_decoder_ctl, opus_encoder_ctl, Decoder related CTLs, Encoder related CTLs

Macro Definition Documentation

#define OPUS_GET_BANDWIDTH(x)

Gets the encoder's configured bandpass or the decoder's last bandpass.

See also

: OPUS_SET_BANDWIDTH

Parameters

x opus_int32 *: Returns one of the following values:

OPUS_AUTO: (default)
OPUS_BANDWIDTH_NARROWBAND: 4 kHz passband
OPUS_BANDWIDTH_MEDIUMBAND: 6 kHz passband
OPUS_BANDWIDTH_WIDEBAND: 8 kHz passband
OPUS_BANDWIDTH_SUPERWIDEBAND: 12 kHz passband
OPUS_BANDWIDTH_FULLBAND: 20 kHz passband

#define OPUS_GET_FINAL_RANGE(x)

Gets the final state of the codec's entropy coder. This is used for testing purposes, The encoder and decoder state should be identical after coding a payload (assuming no data corruption or software bugs)

Parameters

: x opus_uint32 *: Entropy coder state

#define OPUS_GET_IN_DTX(x)

Gets the DTX state of the encoder. Returns whether the last encoded frame was either a comfort noise update during DTX or not encoded because of DTX.

Parameters

x opus_int32 *: Returns one of the following values:

0: The encoder is not in DTX.
1: The encoder is in DTX.

#define OPUS_GET_PHASE_INVERSION_DISABLED(x)

Gets the encoder's configured phase inversion status.

See also

: OPUS_SET_PHASE_INVERSION_DISABLED

Parameters

x opus_int32 *: Returns one of the following values:

0: Stereo phase inversion enabled (default).
1: Stereo phase inversion disabled.

#define OPUS_GET_SAMPLE_RATE(x)

Gets the sampling rate the encoder or decoder was initialized with. This simply returns the Fs value passed to opus_encoder_init() or opus_decoder_init().

Parameters

: x opus_int32 *: Sampling rate of encoder or decoder.

#define OPUS_RESET_STATE

Resets the codec state to be equivalent to a freshly initialized state. This should be called when switching streams in order to prevent the back to back decoding from giving different results from one at a time decoding.

#define OPUS_SET_PHASE_INVERSION_DISABLED(x)

If set to 1, disables the use of phase inversion for intensity stereo, improving the quality of mono downmixes, but slightly reducing normal stereo quality. Disabling phase inversion in the decoder does not comply with RFC 6716, although it does not cause any interoperability issue and is expected to become part of the Opus standard once RFC 6716 is updated by draft-ietf-codec-opus-update.

See also

: OPUS_GET_PHASE_INVERSION_DISABLED

Parameters

x opus_int32: Allowed values:

0: Enable phase inversion (default).
1: Disable phase inversion.

Author

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