use lzw compression in gif encoder

[ffmpeg] / libavcodec / acelp_pitch_delay.c

diff --git a/libavcodec/acelp_pitch_delay.c b/libavcodec/acelp_pitch_delay.c
index 9b35fcc89260e4d2fbe2ae044a674d2cc979f3f5..c3e2409c1e3787a89dc41b54d545c4f0e36dc7f6 100644 (file)
--- a/libavcodec/acelp_pitch_delay.c
+++ b/libavcodec/acelp_pitch_delay.c
@@ -21,8 +21,9 @@
  */
 
 #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)
 {
@@ -87,6 +88,7 @@ void ff_acelp_update_past_gain(
 }
 
 int16_t ff_acelp_decode_gain_code(
+    DSPContext *dsp,
     int gain_corr_factor,
     const int16_t* fc_v,
     int mr_energy,
@@ -103,7 +105,7 @@ int16_t ff_acelp_decode_gain_code(
         mr_energy += quant_energy[i] * ma_prediction_coeff[i];
 
 #ifdef G729_BITEXACT
-    mr_energy += (((-6165LL * ff_log2(sum_of_squares(fc_v, subframe_size, 0, 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)
 
@@ -113,7 +115,72 @@ int16_t ff_acelp_decode_gain_code(
            );
 #else
     mr_energy = gain_corr_factor * exp(M_LN10 / (20 << 23) * mr_energy) /
-                sqrt(sum_of_squares(fc_v, subframe_size, 0, 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(log2f(10.0) * 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;
+}