Moved codec-specific audio packet splitting into decoders.

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

Index: webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.cc
diff --git a/webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.cc b/webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.cc
index 379293b748b043985488e180934c2dd5c9baf060..93b24bdf2c718405fbbbab56fea7c4d8cada2473 100644
--- a/webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.cc
+++ b/webrtc/modules/audio_coding/codecs/g722/audio_decoder_g722.cc
@@ -13,6 +13,7 @@
 #include <string.h>
 
 #include "webrtc/base/checks.h"
+#include "webrtc/modules/audio_coding/codecs/legacy_encoded_audio_frame.h"
 #include "webrtc/modules/audio_coding/codecs/g722/g722_interface.h"
 
 namespace webrtc {
@@ -47,6 +48,14 @@ void AudioDecoderG722::Reset() {
   WebRtcG722_DecoderInit(dec_state_);
 }
 
+std::vector<AudioDecoder::ParseResult> AudioDecoderG722::ParsePayload(
+    rtc::Buffer&& payload,
+    uint32_t timestamp,
+    bool is_primary) {
+  return LegacyEncodedAudioFrame::SplitBySamples(this, std::move(payload),
+                                                 timestamp, is_primary, 8, 16);
+}
+
 int AudioDecoderG722::PacketDuration(const uint8_t* encoded,
                                      size_t encoded_len) const {
   // 1/2 encoded byte per sample per channel.
@@ -117,6 +126,14 @@ void AudioDecoderG722Stereo::Reset() {
   WebRtcG722_DecoderInit(dec_state_right_);
 }
 
+std::vector<AudioDecoder::ParseResult> AudioDecoderG722Stereo::ParsePayload(
+    rtc::Buffer&& payload,
+    uint32_t timestamp,
+    bool is_primary) {
+  return LegacyEncodedAudioFrame::SplitBySamples(
+      this, std::move(payload), timestamp, is_primary, 2 * 8, 16);
+}
+
 // Split the stereo packet and place left and right channel after each other
 // in the output array.
 void AudioDecoderG722Stereo::SplitStereoPacket(const uint8_t* encoded,