correct some spelling error (67a77ab8) · Commits · IVAS Codec Public Collaboration / IVAS Codec

lib_enc/ivas_stereo_td_analysis.c

+16 −16

Original line number	Diff line number	Diff line
		@@ -150,7 +150,7 @@ int16_t stereo_tdm_ener_analysis(
		Get_LR_rms( Left_in, Right_in, input_frame, &rms_L, &rms_R );

		/----------------------------------------------------------------
		* Compute the 1st order energy difference difference
		* Compute the 1st order energy difference
		* Compute the gain of L&R channel compared to mono
		* - estimate the long term evolution of the L to Mono gain
		* - estimate the long term evolution of the R to Mono gain
		@@ -670,7 +670,7 @@ static int16_t Get_dt_lt_ener(
		* The minimum if the auto-correlation of left and right channel
		* has some correlation but are not highly correlated ]0.85,0.92[
		* the long term energy difference between side and mono is > 2.0 or
		* the the instantaneous energy difference between side and mono is > 2.5
		* the instantaneous energy difference between side and mono is > 2.5
		* and the VAD hangover of the primary channel is <= 1
		* and the VAD hangover of the secondary channel is <= 3
		* and the input signal is considered having some correlation (normal TD)
		@@ -696,7 +696,7 @@ static int16_t Get_dt_lt_ener(
		* or the secondary channel is larger than 64
		* then,
		* the flag allowing preliminary switching to SM mode is set to 1
		* and the hysteriesis is reset to 0
		* and the hysteresis is reset to 0
		* else if the hysteresis is >= 20 and the temporary SM flag
		* has been set to 0 above and the pitch stability of the primary
		* or the secondary channel is larger than 64 and the long
		@@ -704,7 +704,7 @@ static int16_t Get_dt_lt_ener(
		* or the instantaneous energy difference between side and mono is <-10
		* then,
		* the flag allowing preliminary switching to SM mode is set to 0
		* and the hysteriesis is reset to 0
		* and the hysteresis is reset to 0
		----------------------------------------------------------------/
		if ( IsSideMono == 0 )
		{
		@@ -888,7 +888,7 @@ static float Comp_diff_lt_corr(
		* correlation (LRTD), and the left or the right channel has more
		* than the double of long term energy than the other channel,
		* then the maximum long term energy between left and right will
		* be choosen to set up the adaption rate.
		* be chosen to set up the adaption rate.
		* for all the other cases, the minimum between the 2 channel
		* long term energy will be used
		----------------------------------------------------------------/
		@@ -924,7 +924,7 @@ static float Comp_diff_lt_corr(
		* In case of switching from a different stereo mode or
		* if on of the channel has very low energy and the signal is
		* considered as having a low correlation (LRTD) and the maximum
		* long term energy betweenm the 2 channel is below 10
		* long term energy between the 2 channel is below 10
		* then speed up the adaptation rate
		----------------------------------------------------------------/
		if ( hCPE->last_element_mode != IVAS_CPE_TD \|\| ( ( tdm_lt_rms_R < 1.0f \|\| tdm_lt_rms_L < 1.0f ) && hCPE->hStereoClassif->lrtd_mode == 1 && max( tdm_lt_rms_R, tdm_lt_rms_L ) < 10.0f ) )
		@@ -937,7 +937,7 @@ static float Comp_diff_lt_corr(
		* Compute the short term correlation to mono difference
		* Then compute the instantaneous ratio between L and R channel.
		* The instantaneous ratio is used for bit rate distribution in case of LRTD,
		* while a more convservative ratio is found later and used for downmixing purpose
		* while a more conservative ratio is found later and used for downmixing purpose
		----------------------------------------------------------------/
		d_lt_corr_raw = ( adaprate_tmp * corr_LM + madaprate * *tdm_lt_corr_LM ) -
		( adaprate_tmp * corr_RM + madaprate * tdm_lt_corr_RM ); / Short term smooth correlation differences to mono */
		@@ -974,7 +974,7 @@ static float Comp_diff_lt_corr(
		* amplified by a factor of 2.5
		*
		* else if the energy differential of both channel are going in the
		* same direction and the variation of the correlation diffirence
		* same direction and the variation of the correlation difference
		* is low and the energy of at least one channel is not too low
		* then,
		* the long term corr uses the values estimated above
		@@ -1074,7 +1074,7 @@ static int16_t limit_idx_Dwnmix(
		static int16_t limit_idx_NoDwnmix(
		const int16_t idx_in, /* i : Index */
		const int16_t side_can_change, /* i : Primary and secondary channel allowed to change ? */
		const float d_lt_corr_raw /* i : Raw corrrelation differences */
		const float d_lt_corr_raw /* i : Raw correlation differences */
		)
		{
		int16_t idx;
		@@ -1142,7 +1142,7 @@ static int16_t stereo_tdm_ener_analysis_SM(
		Get_LR_rms( sts[0]->input, sts[1]->input, input_frame, &rms_L, &rms_R );

		/----------------------------------------------------------------
		* Compute the 1st order energy difference difference
		* Compute the 1st order energy difference
		* Compute the gain of L&R channel compared to mono
		* - estimate the long term evolution of the L to Mono gain
		* - estimate the long term evolution of the R to Mono gain
		@@ -1293,11 +1293,11 @@ int16_t tdm_lp_comparison(
		ener_sig = log10f( sum2_f( speech, L_frame ) + 0.01f );
		predgain_SCh = 10.0f * ( ener_sig - log10f( sum2_f( res, L_frame ) + 0.01f ) );

		/* Find prediction gain when resuing the Primary Channel LP filter */
		/* Find prediction gain when reusing the Primary Channel LP filter */
		residu( A_PCh, m, speech, res, L_frame );
		pred_gain_reuse_PCh = 10.0f * ( ener_sig - log10f( sum2_f( res, L_frame ) + 0.01f ) );

		/* Find Euclidian distance between the 2 filters */
		/* Find Euclidean distance between the 2 filters */
		dist = 0;
		for ( i = 0; i < m; i++ )
		{
		@@ -1306,12 +1306,12 @@ int16_t tdm_lp_comparison(
		}
		ener_sig *= 10.0f;

		/* Verification of the filters similartiies and prediction gain obtained for each channel */
		/* Verification of the filters similarities and prediction gain obtained for each channel */
		/* Threshold are more relax if alpha is close to 0.5 (Valid if ICA is used ) */
		if ( ( ( pred_gain_reuse_PCh >= RATIO_PG * predgain_SCh && dist < EUCLDST ) /* Prediction gain are close & Euclidian dist is small */
		\|\| ( predgain_SCh < PG2ND && dist < EUCLDST2 ) ) /* Prediction gain if the secondary channel is low & Euclidian dist is not too large */
		if ( ( ( pred_gain_reuse_PCh >= RATIO_PG * predgain_SCh && dist < EUCLDST ) /* Prediction gain are close & Euclidean dist is small */
		\|\| ( predgain_SCh < PG2ND && dist < EUCLDST2 ) ) /* Prediction gain if the secondary channel is low & Euclidean dist is not too large */
		\|\| ( hStereoTD->tdm_last_ratio_idx >= ( LRTD_STEREO_MID_IS_PRIM - 2 ) && hStereoTD->tdm_last_ratio_idx <= ( LRTD_STEREO_MID_IS_PRIM + 2 ) && /* ratio between 0.4 and 0.6 */
		( ( pred_gain_reuse_PCh >= RATIO_PG2 * predgain_SCh && dist < EUCLDST2 ) \|\| predgain_SCh < PG2ND2 ) ) /* Prediction gain are not far & Euclidian dist is not too large or Prediction gain if the secondary channel is low */
		( ( pred_gain_reuse_PCh >= RATIO_PG2 * predgain_SCh && dist < EUCLDST2 ) \|\| predgain_SCh < PG2ND2 ) ) /* Prediction gain are not far & Euclidean dist is not too large or Prediction gain if the secondary channel is low */
		\|\| ener_sig <= 30.0f /* secondary channel has low energy */
		)
		{