Rename neteq4 folder to neteq
Keep the old neteq4/audio_decoder_unittests.isolate while waiting for
a hard-coded reference to change.
This CL effectively reverts r6257 "Rename neteq4 folder to neteq".
BUG=2996
TBR=tina.legrand@webrtc.org
Review URL: https://webrtc-codereview.appspot.com/21629004
git-svn-id: http://webrtc.googlecode.com/svn/trunk@6367 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_coding/neteq/preemptive_expand.h b/webrtc/modules/audio_coding/neteq/preemptive_expand.h
new file mode 100644
index 0000000..1aa6133
--- /dev/null
+++ b/webrtc/modules/audio_coding/neteq/preemptive_expand.h
@@ -0,0 +1,87 @@
+/*
+ * 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_PREEMPTIVE_EXPAND_H_
+#define WEBRTC_MODULES_AUDIO_CODING_NETEQ_PREEMPTIVE_EXPAND_H_
+
+#include <assert.h>
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/modules/audio_coding/neteq/audio_multi_vector.h"
+#include "webrtc/modules/audio_coding/neteq/time_stretch.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+// Forward declarations.
+class BackgroundNoise;
+
+// This class implements the PreemptiveExpand operation. Most of the work is
+// done in the base class TimeStretch, which is shared with the Accelerate
+// operation. In the PreemptiveExpand class, the operations that are specific to
+// PreemptiveExpand are implemented.
+class PreemptiveExpand : public TimeStretch {
+ public:
+ PreemptiveExpand(int sample_rate_hz,
+ size_t num_channels,
+ const BackgroundNoise& background_noise,
+ int overlap_samples)
+ : TimeStretch(sample_rate_hz, num_channels, background_noise),
+ old_data_length_per_channel_(-1),
+ overlap_samples_(overlap_samples) {
+ }
+
+ virtual ~PreemptiveExpand() {}
+
+ // This method performs the actual PreemptiveExpand operation. The samples are
+ // read from |input|, of length |input_length| elements, and are written to
+ // |output|. The number of samples added through time-stretching is
+ // is provided in the output |length_change_samples|. The method returns
+ // the outcome of the operation as an enumerator value.
+ ReturnCodes Process(const int16_t *pw16_decoded,
+ int len,
+ int old_data_len,
+ AudioMultiVector* output,
+ int16_t* length_change_samples);
+
+ protected:
+ // Sets the parameters |best_correlation| and |peak_index| to suitable
+ // values when the signal contains no active speech.
+ virtual void SetParametersForPassiveSpeech(size_t len,
+ int16_t* w16_bestCorr,
+ int* w16_bestIndex) const;
+
+ // Checks the criteria for performing the time-stretching operation and,
+ // if possible, performs the time-stretching.
+ virtual ReturnCodes CheckCriteriaAndStretch(
+ const int16_t *pw16_decoded, size_t len, size_t w16_bestIndex,
+ int16_t w16_bestCorr, bool w16_VAD,
+ AudioMultiVector* output) const;
+
+ private:
+ int old_data_length_per_channel_;
+ int overlap_samples_;
+
+ DISALLOW_COPY_AND_ASSIGN(PreemptiveExpand);
+};
+
+struct PreemptiveExpandFactory {
+ PreemptiveExpandFactory() {}
+ virtual ~PreemptiveExpandFactory() {}
+
+ virtual PreemptiveExpand* Create(
+ int sample_rate_hz,
+ size_t num_channels,
+ const BackgroundNoise& background_noise,
+ int overlap_samples) const;
+};
+
+} // namespace webrtc
+#endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ_PREEMPTIVE_EXPAND_H_