+ weight_coeff_b * in_b[i];
}
-void ff_adaptive_gain_control(float *buf_out, float speech_energ,
+void ff_adaptive_gain_control(float *out, const float *in, float speech_energ,
int size, float alpha, float *gain_mem)
{
int i;
- float postfilter_energ = ff_dot_productf(buf_out, buf_out, size);
+ float postfilter_energ = ff_dot_productf(in, in, size);
float gain_scale_factor = 1.0;
float mem = *gain_mem;
for (i = 0; i < size; i++) {
mem = alpha * mem + gain_scale_factor;
- buf_out[i] *= mem;
+ out[i] = in[i] * mem;
}
*gain_mem = mem;
/**
* Adaptive gain control (as used in AMR postfiltering)
*
- * @param buf_out the input speech buffer
+ * @param out output buffer for filtered speech data
+ * @param in the input speech buffer (may be the same as out)
* @param speech_energ input energy
* @param size the input buffer size
* @param alpha exponential filter factor
* @param gain_mem a pointer to the filter memory (single float of size)
*/
-void ff_adaptive_gain_control(float *buf_out, float speech_energ,
+void ff_adaptive_gain_control(float *out, const float *in, float speech_energ,
int size, float alpha, float *gain_mem);
/**
ff_tilt_compensation(&p->tilt_mem, tilt_factor(lpc_n, lpc_d), buf_out,
AMR_SUBFRAME_SIZE);
- ff_adaptive_gain_control(buf_out, speech_gain, AMR_SUBFRAME_SIZE,
+ ff_adaptive_gain_control(buf_out, buf_out, speech_gain, AMR_SUBFRAME_SIZE,
AMR_AGC_ALPHA, &p->postfilter_agc);
}
float energy = ff_dot_productf(ctx->postfilter_syn5k0 + LP_FILTER_ORDER + i*SUBFR_SIZE,
ctx->postfilter_syn5k0 + LP_FILTER_ORDER + i*SUBFR_SIZE,
SUBFR_SIZE);
- ff_adaptive_gain_control(&synth[i * SUBFR_SIZE], energy,
+ ff_adaptive_gain_control(&synth[i * SUBFR_SIZE],
+ &synth[i * SUBFR_SIZE], energy,
SUBFR_SIZE, 0.9, &ctx->postfilter_agc);
}