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

webrtc/modules/audio_coding/neteq/decision_logic_fax.cc

@@ -0,0 +1,102 @@
+/*
+ *  Copyright (c) 2013 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.
+ */
+
+#include "webrtc/modules/audio_coding/neteq/decision_logic_fax.h"
+
+#include <assert.h>
+
+#include <algorithm>
+
+#include "webrtc/modules/audio_coding/neteq/decoder_database.h"
+#include "webrtc/modules/audio_coding/neteq/sync_buffer.h"
+
+namespace webrtc {
+
+Operations DecisionLogicFax::GetDecisionSpecialized(
+    const SyncBuffer& sync_buffer,
+    const Expand& expand,
+    int decoder_frame_length,
+    const RTPHeader* packet_header,
+    Modes prev_mode,
+    bool play_dtmf,
+    bool* reset_decoder) {
+  assert(playout_mode_ == kPlayoutFax || playout_mode_ == kPlayoutOff);
+  uint32_t target_timestamp = sync_buffer.end_timestamp();
+  uint32_t available_timestamp = 0;
+  int is_cng_packet = 0;
+  if (packet_header) {
+    available_timestamp = packet_header->timestamp;
+    is_cng_packet =
+        decoder_database_->IsComfortNoise(packet_header->payloadType);
+  }
+  if (is_cng_packet) {
+    if (static_cast<int32_t>((generated_noise_samples_ + target_timestamp)
+        - available_timestamp) >= 0) {
+      // Time to play this packet now.
+      return kRfc3389Cng;
+    } else {
+      // Wait before playing this packet.
+      return kRfc3389CngNoPacket;
+    }
+  }
+  if (!packet_header) {
+    // No packet. If in CNG mode, play as usual. Otherwise, use other method to
+    // generate data.
+    if (cng_state_ == kCngRfc3389On) {
+      // Continue playing comfort noise.
+      return kRfc3389CngNoPacket;
+    } else if (cng_state_ == kCngInternalOn) {
+      // Continue playing codec-internal comfort noise.
+      return kCodecInternalCng;
+    } else {
+      // Nothing to play. Generate some data to play out.
+      switch (playout_mode_) {
+        case kPlayoutOff:
+          return kAlternativePlc;
+        case kPlayoutFax:
+          return kAudioRepetition;
+        default:
+          assert(false);
+          return kUndefined;
+      }
+    }
+  } else if (target_timestamp == available_timestamp) {
+    return kNormal;
+  } else {
+    if (static_cast<int32_t>((generated_noise_samples_ + target_timestamp)
+        - available_timestamp) >= 0) {
+      return kNormal;
+    } else {
+      // If currently playing comfort noise, continue with that. Do not
+      // increase the timestamp counter since generated_noise_samples_ will
+      // be increased.
+      if (cng_state_ == kCngRfc3389On) {
+        return kRfc3389CngNoPacket;
+      } else if (cng_state_ == kCngInternalOn) {
+        return kCodecInternalCng;
+      } else {
+        // Otherwise, do packet-loss concealment and increase the
+        // timestamp while waiting for the time to play this packet.
+        switch (playout_mode_) {
+          case kPlayoutOff:
+            return kAlternativePlcIncreaseTimestamp;
+          case kPlayoutFax:
+            return kAudioRepetitionIncreaseTimestamp;
+          default:
+            assert(0);
+            return kUndefined;
+        }
+      }
+    }
+  }
+}
+
+
+}  // namespace webrtc