Changed AudioEncoder::Encode to take an rtc::Buffer* instead of uint8_t* and a maximum size.

webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc

Index: webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc
diff --git a/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc b/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc
index 7ef1ce096bd80221c706962c6a0706f052f5e816..1dde49d1ba7d3dc9cfe2c400341571ac63920e97 100644
--- a/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc
+++ b/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc
@@ -55,13 +55,14 @@ int AudioEncoderCopyRed::GetTargetBitrate() const {
 AudioEncoder::EncodedInfo AudioEncoderCopyRed::EncodeInternal(
     uint32_t rtp_timestamp,
     rtc::ArrayView<const int16_t> audio,
-    size_t max_encoded_bytes,
-    uint8_t* encoded) {
+    rtc::Buffer* encoded) {
+
+  const size_t primary_offset = encoded->size();
   EncodedInfo info =
-      speech_encoder_->Encode(rtp_timestamp, audio, max_encoded_bytes, encoded);
-  RTC_CHECK_GE(max_encoded_bytes,
-               info.encoded_bytes + secondary_info_.encoded_bytes);
+      speech_encoder_->Encode(rtp_timestamp, audio, encoded);
+
   RTC_CHECK(info.redundant.empty()) << "Cannot use nested redundant encoders.";
+  RTC_DCHECK_EQ(encoded->size() - primary_offset, info.encoded_bytes);
 
   if (info.encoded_bytes > 0) {
     // |info| will be implicitly cast to an EncodedInfoLeaf struct, effectively
@@ -70,13 +71,13 @@ AudioEncoder::EncodedInfo AudioEncoderCopyRed::EncodeInternal(
     info.redundant.push_back(info);
     RTC_DCHECK_EQ(info.redundant.size(), 1u);
     if (secondary_info_.encoded_bytes > 0) {
-      memcpy(&encoded[info.encoded_bytes], secondary_encoded_.data(),
-             secondary_info_.encoded_bytes);
+      encoded->AppendData(secondary_encoded_);
       info.redundant.push_back(secondary_info_);
       RTC_DCHECK_EQ(info.redundant.size(), 2u);
     }
     // Save primary to secondary.
-    secondary_encoded_.SetData(encoded, info.encoded_bytes);
+    secondary_encoded_.SetData(encoded->data() + primary_offset,
+                               info.encoded_bytes);
     secondary_info_ = info;
     RTC_DCHECK_EQ(info.speech, info.redundant[0].speech);
   }