Moved codec-specific audio packet splitting into decoders.

webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.h

Index: webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.h
diff --git a/webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.h b/webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.h
index ccca73d1a19dc21a4ebd9ef79b20b0065ff69bea..ac3c5b433425c96df72ac83fed0a92d9df3d59b8 100644
--- a/webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.h
+++ b/webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.h
@@ -24,6 +24,9 @@ class AudioDecoderG722 final : public AudioDecoder {
   ~AudioDecoderG722() override;
   bool HasDecodePlc() const override;
   void Reset() override;
+  std::vector<ParseResult> ParsePayload(rtc::Buffer* payload,
+                                        uint32_t timestamp,
+                                        bool is_primary) override;
   int PacketDuration(const uint8_t* encoded, size_t encoded_len) const override;
   int SampleRateHz() const override;
   size_t Channels() const override;
@@ -45,6 +48,9 @@ class AudioDecoderG722Stereo final : public AudioDecoder {
   AudioDecoderG722Stereo();
   ~AudioDecoderG722Stereo() override;
   void Reset() override;
+  std::vector<ParseResult> ParsePayload(rtc::Buffer* payload,
+                                        uint32_t timestamp,
+                                        bool is_primary) override;
   int SampleRateHz() const override;
   size_t Channels() const override;