Fix a data race in AudioEncoderMutableImpl and derived classes

webrtc/modules/audio_coding/codecs/isac/fix/source/audio_encoder_isacfix.cc

Index: webrtc/modules/audio_coding/codecs/isac/fix/source/audio_encoder_isacfix.cc
diff --git a/webrtc/modules/audio_coding/codecs/isac/fix/source/audio_encoder_isacfix.cc b/webrtc/modules/audio_coding/codecs/isac/fix/source/audio_encoder_isacfix.cc
index 4003b26e70f94f5a5288ac8138813794ad76db8b..c7999b56be36deb1f6e54f09dd77ecd8c75da3c5 100644
--- a/webrtc/modules/audio_coding/codecs/isac/fix/source/audio_encoder_isacfix.cc
+++ b/webrtc/modules/audio_coding/codecs/isac/fix/source/audio_encoder_isacfix.cc
@@ -67,6 +67,7 @@ int AudioEncoderDecoderMutableIsacFix::Decode(const uint8_t* encoded,
                                               size_t max_decoded_bytes,
                                               int16_t* decoded,
                                               SpeechType* speech_type) {
+  CriticalSectionScoped cs(encoder_lock_.get());
   return encoder()->Decode(encoded, encoded_len, sample_rate_hz,
                            max_decoded_bytes, decoded, speech_type);
 }
@@ -78,20 +79,24 @@ int AudioEncoderDecoderMutableIsacFix::DecodeRedundant(
     size_t max_decoded_bytes,
     int16_t* decoded,
     SpeechType* speech_type) {
+  CriticalSectionScoped cs(encoder_lock_.get());
   return encoder()->DecodeRedundant(encoded, encoded_len, sample_rate_hz,
                                     max_decoded_bytes, decoded, speech_type);
 }
 
 bool AudioEncoderDecoderMutableIsacFix::HasDecodePlc() const {
+  CriticalSectionScoped cs(encoder_lock_.get());
   return encoder()->HasDecodePlc();
 }
 
 int AudioEncoderDecoderMutableIsacFix::DecodePlc(int num_frames,
                                                  int16_t* decoded) {
+  CriticalSectionScoped cs(encoder_lock_.get());
   return encoder()->DecodePlc(num_frames, decoded);
 }
 
 int AudioEncoderDecoderMutableIsacFix::Init() {
+  CriticalSectionScoped cs(encoder_lock_.get());
   return encoder()->Init();
 }
 
@@ -101,32 +106,38 @@ int AudioEncoderDecoderMutableIsacFix::IncomingPacket(
     uint16_t rtp_sequence_number,
     uint32_t rtp_timestamp,
     uint32_t arrival_timestamp) {
+  CriticalSectionScoped cs(encoder_lock_.get());
   return encoder()->IncomingPacket(payload, payload_len, rtp_sequence_number,
                                    rtp_timestamp, arrival_timestamp);
 }
 
 int AudioEncoderDecoderMutableIsacFix::ErrorCode() {
+  CriticalSectionScoped cs(encoder_lock_.get());
   return encoder()->ErrorCode();
 }
 
 int AudioEncoderDecoderMutableIsacFix::PacketDuration(
     const uint8_t* encoded,
     size_t encoded_len) const {
+  CriticalSectionScoped cs(encoder_lock_.get());
   return encoder()->PacketDuration(encoded, encoded_len);
 }
 
 int AudioEncoderDecoderMutableIsacFix::PacketDurationRedundant(
     const uint8_t* encoded,
     size_t encoded_len) const {
+  CriticalSectionScoped cs(encoder_lock_.get());
   return encoder()->PacketDurationRedundant(encoded, encoded_len);
 }
 
 bool AudioEncoderDecoderMutableIsacFix::PacketHasFec(const uint8_t* encoded,
                                                      size_t encoded_len) const {
+  CriticalSectionScoped cs(encoder_lock_.get());
   return encoder()->PacketHasFec(encoded, encoded_len);
 }
 
 size_t AudioEncoderDecoderMutableIsacFix::Channels() const {
+  CriticalSectionScoped cs(encoder_lock_.get());
   return encoder()->Channels();
 }