Move LC3 decoder

Make place for in-house implementation

Bug: 150670922
Change-Id: Id7734518835a8e08c8d617bb34073a836589a6de

1 files changed, 147 insertions, 0 deletions

diff --git a/system/embdrv/lc3_dec/Decoder/DecoderFrame.hpp b/system/embdrv/lc3_dec/Decoder/DecoderFrame.hpp
new file mode 100644
index 0000000000..4ce1c86b66
--- /dev/null
+++ b/system/embdrv/lc3_dec/Decoder/DecoderFrame.hpp
@@ -0,0 +1,147 @@
+/*
+ * DecoderFrame.hpp
+ *
+ * Copyright 2021 HIMSA II K/S - www.himsa.com. Represented by EHIMA -
+ * www.ehima.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __DECODER_FRAME_HPP_
+#define __DECODER_FRAME_HPP_
+
+#include <cstdint>
+
+#include "ArithmeticDec.hpp"
+#include "Datapoints.hpp"
+#include "Lc3Config.hpp"
+#include "LongTermPostfilter.hpp"
+#include "MdctDec.hpp"
+#include "PacketLossConcealment.hpp"
+#include "ResidualSpectrum.hpp"
+#include "SideInformation.hpp"
+#include "SpectralNoiseShaping.hpp"
+
+namespace Lc3Dec {
+
+class DecoderFrame {
+ public:
+  DecoderFrame(ResidualSpectrum& residualSpectrum_,
+               SpectralNoiseShaping& spectralNoiseShaping_,
+               PacketLossConcealment& packetLossConcealment_, MdctDec& mdctDec_,
+               const Lc3Config& lc3Config_, uint16_t nbytes_);
+  virtual ~DecoderFrame();
+
+  void registerDatapoints(DatapointContainer* datapoints_);
+
+  template <typename T>
+  void run(const uint8_t* bytes, uint8_t BFI,
+           uint16_t bits_per_audio_sample_dec, T* x_out, uint8_t& BEC_detect) {
+    if (!lc3Config.isValid()) {
+      return;
+    }
+
+    // main decoder implementation: 3.4.1 until 3.4.9 (d09r06)
+    runFloat(bytes, BFI, BEC_detect);
+
+    // 3.4.10 Output signal scaling and rounding   (d09r06)
+    const uint32_t outputScale = 1UL << (-15 + bits_per_audio_sample_dec - 1);
+    for (uint16_t k = 0; k < lc3Config.NF; k++) {
+      double x_hat_clip_local;
+      if (longTermPostfilter.x_hat_ltpf[k] > 32767) {
+        x_hat_clip_local = 32767;
+      } else if (longTermPostfilter.x_hat_ltpf[k] < -32768) {
+        x_hat_clip_local = -32768;
+      } else {
+        x_hat_clip_local = longTermPostfilter.x_hat_ltpf[k];
+      }
+
+      // datapoint buffer for x_hat_clip only prepared when datapoints are
+      // available
+      if (nullptr != x_hat_clip) {
+        x_hat_clip[k] = x_hat_clip_local;
+      }
+
+      // Round 𝑥 to nearest integer, e.g., ⌊−4.5⌉ = −5, ⌊−3.2⌉ = −3, ⌊3.2⌉ = 3,
+      // ⌊4.5⌉ = 5,
+      if (x_hat_clip_local > 0) {
+        x_out[k] = outputScale * x_hat_clip_local + 0.5;
+      } else {
+        x_out[k] = outputScale * x_hat_clip_local - 0.5;
+      }
+    }
+
+    if (nullptr != datapoints) {
+      datapoints->log("x_out", &x_out[0], sizeof(T) * lc3Config.NF);
+      datapoints->log("BER_detect", &BEC_detect, sizeof(BEC_detect));
+    }
+  }
+
+  void linkPreviousFrame(DecoderFrame* previousFrame);
+
+  // per instance constant parameter
+  const uint16_t nbytes;
+  const uint16_t nbits;
+  const Lc3Config& lc3Config;
+  const uint8_t tns_lpc_weighting;
+
+ private:
+  void runFloat(const uint8_t* bytes, uint8_t BFI, uint8_t& BEC_detect);
+
+  void noiseFilling();
+  void applyGlobalGain();
+  void temporalNoiseShaping();
+
+  SideInformation sideInformation;
+  ArithmeticDec arithmeticDec;
+  ResidualSpectrum& residualSpectrum;
+  SpectralNoiseShaping& spectralNoiseShaping;
+  PacketLossConcealment& packetLossConcealment;
+  MdctDec& mdctDec;
+  LongTermPostfilter longTermPostfilter;
+
+  DatapointContainer* datapoints;
+
+  // states & outputs
+  int16_t frameN;
+
+  int16_t lastnz;
+  int16_t P_BW;
+  uint8_t lsbMode;
+  int16_t gg_ind;
+  int16_t num_tns_filters;
+  int16_t rc_order[2];
+  uint8_t pitch_present;
+  int16_t pitch_index;
+  int16_t ltpf_active;
+  int16_t F_NF;
+  int16_t ind_LF;
+  int16_t ind_HF;
+  int16_t Gind;
+  int16_t LS_indA;
+  int16_t LS_indB;
+  int32_t idxA;
+  int16_t idxB;
+  uint16_t nf_seed;
+  uint16_t zeroFrame;
+  int16_t gg_off;
+  double* X_hat_q_nf;
+  double* X_hat_f;
+  double* X_s_tns;
+  double* X_hat_ss;
+  double* x_hat_clip;
+};
+
+}  // namespace Lc3Dec
+
+#endif  // __DECODER_FRAME_HPP_