1 files changed, 56 insertions, 0 deletions
diff --git a/chromium/third_party/webrtc/modules/audio_coding/neteq/dtmf_tone_generator.h b/chromium/third_party/webrtc/modules/audio_coding/neteq/dtmf_tone_generator.h
new file mode 100644
index 00000000000..fc1e5e4ad3d
--- /dev/null
+++ b/chromium/third_party/webrtc/modules/audio_coding/neteq/dtmf_tone_generator.h
@@ -0,0 +1,56 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ_DTMF_TONE_GENERATOR_H_
+#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_DTMF_TONE_GENERATOR_H_
+
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/modules/audio_coding/neteq/audio_multi_vector.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+// This class provides a generator for DTMF tones.
+class DtmfToneGenerator {
+ public:
+  enum ReturnCodes {
+    kNotInitialized = -1,
+    kParameterError = -2,
+    kStereoNotSupported = -3,
+  };
+
+  DtmfToneGenerator();
+  virtual ~DtmfToneGenerator() {}
+  virtual int Init(int fs, int event, int attenuation);
+  virtual void Reset();
+  virtual int Generate(int num_samples, AudioMultiVector* output);
+  virtual bool initialized() const { return initialized_; }
+
+ private:
+  static const int kCoeff1[4][16];  // 1st oscillator model coefficient table.
+  static const int kCoeff2[4][16];  // 2nd oscillator model coefficient table.
+  static const int kInitValue1[4][16];  // Initialization for 1st oscillator.
+  static const int kInitValue2[4][16];  // Initialization for 2nd oscillator.
+  static const int kAmplitude[37];  // Amplitude for 0 through -36 dBm0.
+  static const int16_t kAmpMultiplier = 23171;  // 3 dB attenuation (in Q15).
+
+  bool initialized_;            // True if generator is initialized properly.
+  int coeff1_;                  // 1st oscillator coefficient for this event.
+  int coeff2_;                  // 2nd oscillator coefficient for this event.
+  int amplitude_;               // Amplitude for this event.
+  int16_t sample_history1_[2];  // Last 2 samples for the 1st oscillator.
+  int16_t sample_history2_[2];  // Last 2 samples for the 2nd oscillator.
+
+  DISALLOW_COPY_AND_ASSIGN(DtmfToneGenerator);
+};
+
+}  // namespace webrtc
+#endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_DTMF_TONE_GENERATOR_H_