Moved codec-specific audio packet splitting into decoders.

webrtc/modules/audio_coding/codecs/g711/audio_decoder_pcm.cc

Index: webrtc/modules/audio_coding/codecs/g711/audio_decoder_pcm.cc
diff --git a/webrtc/modules/audio_coding/codecs/g711/audio_decoder_pcm.cc b/webrtc/modules/audio_coding/codecs/g711/audio_decoder_pcm.cc
index af164c4bb72b0b25525b3999f3e6887390a0b802..0863533c5df1a5b2f968f8224fe908d8ec44e40f 100644
--- a/webrtc/modules/audio_coding/codecs/g711/audio_decoder_pcm.cc
+++ b/webrtc/modules/audio_coding/codecs/g711/audio_decoder_pcm.cc
@@ -16,6 +16,12 @@ namespace webrtc {
 
 void AudioDecoderPcmU::Reset() {}
 
+AudioDecoder::PacketSplits AudioDecoderPcmU::SplitPacket(
+    const uint8_t* payload,
+    size_t payload_len) const {
+  return SplitBySamples(payload, payload_len, 8 * num_channels_, 8);
+}
+
 int AudioDecoderPcmU::SampleRateHz() const {
   return 8000;
 }
@@ -44,6 +50,12 @@ int AudioDecoderPcmU::PacketDuration(const uint8_t* encoded,
 
 void AudioDecoderPcmA::Reset() {}
 
+AudioDecoder::PacketSplits AudioDecoderPcmA::SplitPacket(
+    const uint8_t* payload,
+    size_t payload_len) const {
+  return SplitBySamples(payload, payload_len, 8 * num_channels_, 8);
+}
+
 int AudioDecoderPcmA::SampleRateHz() const {
   return 8000;
 }