Fixing init time error in smoothing filter.

webrtc/voice_engine/channel.cc

Index: webrtc/voice_engine/channel.cc
diff --git a/webrtc/voice_engine/channel.cc b/webrtc/voice_engine/channel.cc
index 100832de3adeb2dc986cd255dc271a109ea6bbb7..66d68301bae53468cf598314ac6f8b157f7ca725 100644
--- a/webrtc/voice_engine/channel.cc
+++ b/webrtc/voice_engine/channel.cc
@@ -925,9 +925,9 @@ Channel::Channel(int32_t channelId,
       retransmission_rate_limiter_(new RateLimiter(Clock::GetRealTimeClock(),
                                                    kMaxRetransmissionWindowMs)),
       decoder_factory_(config.acm_config.decoder_factory),
-      // Bitrate smoother can be initialized with arbitrary time constant
-      // (0 used here). The actual time constant will be set in SetBitRate.
-      bitrate_smoother_(0, Clock::GetRealTimeClock()) {
+      // The initialization time for bitrate smoother follows a rough estimate
+      // of the probing interval of the bandwidth estimator.
+      bitrate_smoother_(500, Clock::GetRealTimeClock()) {
   WEBRTC_TRACE(kTraceMemory, kTraceVoice, VoEId(_instanceId, _channelId),
                "Channel::Channel() - ctor");
   AudioCodingModule::Config acm_config(config.acm_config);