- initial import

2018-06-05 11:05:37 +03:00
commit e1a4931375
4673 changed files with 1383093 additions and 0 deletions
--- a/src/engine/audio/Audio_Resampler.h
+++ b/src/engine/audio/Audio_Resampler.h
@@ -0,0 +1,97 @@
+/* Copyright(C) 2007-2014 VoIP objects (voipobjects.com)
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef __AUDIO_RESAMPLER_H
+#define __AUDIO_RESAMPLER_H
+
+#include "signal_processing_library/signal_processing_library.h"
+#include "../helper/HL_Pointer.h"
+#include <vector>
+#include <memory>
+
+namespace Audio 
+{
+  class SpeexResampler
+  {
+  public:
+    SpeexResampler();
+    ~SpeexResampler();
+    
+    void start(int channels, int sourceRate, int destRate);
+    void stop();
+    int processBuffer(const void* source, int sourceLength, int& sourceProcessed, void* dest, int destCapacity);
+    int sourceRate();
+    int destRate();
+    int getDestLength(int sourceLen);
+    int getSourceLength(int destLen);
+
+    // Returns instance + speex encoder size in bytes
+    int getSize() const;
+
+  protected:
+    void* mContext;
+    int   mErrorCode;
+    int   mSourceRate,
+          mDestRate,
+          mChannels;
+	  short mLastSample;
+  };
+
+  typedef SpeexResampler Resampler;
+  typedef std::shared_ptr<Resampler> PResampler;
+
+  class ChannelConverter
+  {
+  public:
+    static int stereoToMono(const void* source, int sourceLength, void* dest, int destLength);
+    static int monoToStereo(const void* source, int sourceLength, void* dest, int destLength);
+  };
+
+  // Operates with AUDIO_CHANNELS number of channels
+  class UniversalResampler
+  {
+  public:
+    UniversalResampler();
+    ~UniversalResampler();
+
+    int resample(int sourceRate, const void* sourceBuffer, int sourceLength, int& sourceProcessed, int destRate, void* destBuffer, int destCapacity);
+    int getDestLength(int sourceRate, int destRate, int sourceLength);
+    int getSourceLength(int sourceRate, int destRate, int destLength);
+
+  protected:
+    typedef std::pair<int, int> RatePair;
+    typedef std::map<RatePair, PResampler> ResamplerMap;
+    ResamplerMap mResamplerMap;
+    PResampler findResampler(int sourceRate, int destRate);
+
+    void preload();
+  };
+
+  // n*10 milliseconds buffers required!
+  class Resampler48kTo16k
+  {
+  public:
+    Resampler48kTo16k();
+    ~Resampler48kTo16k();
+    int process(const void* source, int sourceLen, void* dest, int destLen);
+  protected:
+    WebRtc_Word32 mTemp[496];
+    WebRtcSpl_State48khzTo16khz mContext;
+  };
+
+  class Resampler16kto48k
+  {
+  public:
+    Resampler16kto48k();
+    ~Resampler16kto48k();
+    int process(const void* source, int sourceLen, void* dest, int destLen);
+
+  protected:
+    WebRtc_Word32 mTemp[336];
+    WebRtcSpl_State16khzTo48khz mContext;
+  };
+}
+
+#endif