Generic CTLs

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

Macros
#define	OPUS_RESET_STATE
	Resets the codec state to be equivalent to a freshly initialized state. More...
#define	OPUS_GET_FINAL_RANGE(x)
	Gets the final state of the codec's entropy coder. More...
#define	OPUS_GET_PITCH(x)
	Gets the pitch of the last decoded frame, if available. More...
#define	OPUS_GET_BANDWIDTH(x)
	Gets the encoder's configured bandpass or the decoder's last bandpass. More...

Detailed Description

These macros are used with the celt_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 = celt_opus_decoder_ctl(dec_ctx, OPUS_GET_PITCH(&pitch));
if (ret == OPUS_OK) return ret;

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

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

See also

Opus Encoder, celt_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

[out]

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

[out]

x

opus_uint32 *: Entropy coder state

#define OPUS_GET_PITCH

(

x

)

Gets the pitch of the last decoded frame, if available.

This can be used for any post-processing algorithm requiring the use of pitch, e.g. time stretching/shortening. If the last frame was not voiced, or if the pitch was not coded in the frame, then zero is returned.

This CTL is only implemented for decoder instances.

Parameters

[out]

x

opus_int32 *: pitch period at 48 kHz (or 0 if not available)

#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.