Support for Signal calls.

Merge in RedPhone

// FREEBIE

jni/webrtc/modules/audio_coding/main/acm2/acm_red.cc

@@ -0,0 +1,54 @@
+/*
+ *  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.
+ */
+
+#include "webrtc/modules/audio_coding/main/acm2/acm_red.h"
+
+#include "webrtc/modules/audio_coding/main/acm2/acm_common_defs.h"
+#include "webrtc/system_wrappers/interface/trace.h"
+
+namespace webrtc {
+
+namespace acm2 {
+
+ACMRED::ACMRED(int16_t codec_id) { codec_id_ = codec_id; }
+
+ACMRED::~ACMRED() {}
+
+int16_t ACMRED::InternalEncode(uint8_t* /* bitstream */,
+                               int16_t* /* bitstream_len_byte */) {
+  // RED is never used as an encoder
+  // RED has no instance
+  return 0;
+}
+
+int16_t ACMRED::InternalInitEncoder(WebRtcACMCodecParams* /* codec_params */) {
+  // This codec does not need initialization,
+  // RED has no instance
+  return 0;
+}
+
+ACMGenericCodec* ACMRED::CreateInstance(void) { return NULL; }
+
+int16_t ACMRED::InternalCreateEncoder() {
+  // RED has no instance
+  return 0;
+}
+
+void ACMRED::InternalDestructEncoderInst(void* /* ptr_inst */) {
+  // RED has no instance
+}
+
+void ACMRED::DestructEncoderSafe() {
+  // RED has no instance
+}
+
+}  // namespace acm2
+
+}  // namespace webrtc