*/
#include "avcodec.h"
+#include "dsputil.h"
#include "acelp_pitch_delay.h"
-#include "acelp_math.h"
+#include "celp_math.h"
int ff_acelp_decode_8bit_to_1st_delay3(int ac_index)
{
}
int16_t ff_acelp_decode_gain_code(
+ DSPContext *dsp,
int gain_corr_factor,
const int16_t* fc_v,
int mr_energy,
mr_energy += quant_energy[i] * ma_prediction_coeff[i];
#ifdef G729_BITEXACT
- mr_energy += (((-6165LL * ff_log2(dot_product(fc_v, fc_v, subframe_size, 0))) >> 3) & ~0x3ff);
+ mr_energy += (((-6165LL * ff_log2(dsp->scalarproduct_int16(fc_v, fc_v, subframe_size, 0))) >> 3) & ~0x3ff);
mr_energy = (5439 * (mr_energy >> 15)) >> 8; // (0.15) = (0.15) * (7.23)
);
#else
mr_energy = gain_corr_factor * exp(M_LN10 / (20 << 23) * mr_energy) /
- sqrt(dot_product(fc_v, fc_v, subframe_size, 0));
+ sqrt(dsp->scalarproduct_int16(fc_v, fc_v, subframe_size, 0));
return mr_energy >> 12;
#endif
}
+
+float ff_amr_set_fixed_gain(float fixed_gain_factor, float fixed_mean_energy,
+ float *prediction_error, float energy_mean,
+ const float *pred_table)
+{
+ // Equations 66-69:
+ // ^g_c = ^gamma_gc * 100.05 (predicted dB + mean dB - dB of fixed vector)
+ // Note 10^(0.05 * -10log(average x2)) = 1/sqrt((average x2)).
+ float val = fixed_gain_factor *
+ exp2f(M_LOG2_10 * 0.05 *
+ (ff_dot_productf(pred_table, prediction_error, 4) +
+ energy_mean)) /
+ sqrtf(fixed_mean_energy);
+
+ // update quantified prediction error energy history
+ memmove(&prediction_error[0], &prediction_error[1],
+ 3 * sizeof(prediction_error[0]));
+ prediction_error[3] = 20.0 * log10f(fixed_gain_factor);
+
+ return val;
+}
+
+void ff_decode_pitch_lag(int *lag_int, int *lag_frac, int pitch_index,
+ const int prev_lag_int, const int subframe,
+ int third_as_first, int resolution)
+{
+ /* Note n * 10923 >> 15 is floor(x/3) for 0 <= n <= 32767 */
+ if (subframe == 0 || (subframe == 2 && third_as_first)) {
+
+ if (pitch_index < 197)
+ pitch_index += 59;
+ else
+ pitch_index = 3 * pitch_index - 335;
+
+ } else {
+ if (resolution == 4) {
+ int search_range_min = av_clip(prev_lag_int - 5, PITCH_DELAY_MIN,
+ PITCH_DELAY_MAX - 9);
+
+ // decoding with 4-bit resolution
+ if (pitch_index < 4) {
+ // integer only precision for [search_range_min, search_range_min+3]
+ pitch_index = 3 * (pitch_index + search_range_min) + 1;
+ } else if (pitch_index < 12) {
+ // 1/3 fractional precision for [search_range_min+3 1/3, search_range_min+5 2/3]
+ pitch_index += 3 * search_range_min + 7;
+ } else {
+ // integer only precision for [search_range_min+6, search_range_min+9]
+ pitch_index = 3 * (pitch_index + search_range_min - 6) + 1;
+ }
+ } else {
+ // decoding with 5 or 6 bit resolution, 1/3 fractional precision
+ pitch_index--;
+
+ if (resolution == 5) {
+ pitch_index += 3 * av_clip(prev_lag_int - 10, PITCH_DELAY_MIN,
+ PITCH_DELAY_MAX - 19);
+ } else
+ pitch_index += 3 * av_clip(prev_lag_int - 5, PITCH_DELAY_MIN,
+ PITCH_DELAY_MAX - 9);
+ }
+ }
+ *lag_int = pitch_index * 10923 >> 15;
+ *lag_frac = pitch_index - 3 * *lag_int - 1;
+}