[Chromecast] Resample all audio below 32000 Hz.

chromecast/media/cma/backend/alsa/audio_decoder_alsa.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromecast/media/cma/backend/alsa/audio_decoder_alsa.h"
 
 #include <time.h>
 
 #include <algorithm>
 #include <limits>
@@ skipping 16 matching lines @@
   TRACE_EVENT2("cma", __FUNCTION__, #arg1, arg1, #arg2, arg2)
 
 namespace chromecast {
 namespace media {
 
 namespace {
 
 const CastAudioDecoder::OutputFormat kDecoderSampleFormat =
     CastAudioDecoder::kOutputPlanarFloat;
 
-const int kInvalidSampleRate = -1;
 const int64_t kInvalidDelayTimestamp = std::numeric_limits<int64_t>::min();
 
 AudioDecoderAlsa::RenderingDelay kInvalidRenderingDelay() {
   AudioDecoderAlsa::RenderingDelay delay;
   delay.timestamp_microseconds = kInvalidDelayTimestamp;
   delay.delay_microseconds = 0;
   return delay;
 }
 
 }  // namespace
@@ skipping 38 matching lines @@
     last_known_delay_.timestamp_microseconds = kInvalidDelayTimestamp;
     return false;
   }
   last_known_delay_.delay_microseconds = 0;
   return true;
 }
 
 bool AudioDecoderAlsa::Start(int64_t start_pts) {
   TRACE_FUNCTION_ENTRY0();
   current_pts_ = start_pts;
-  DCHECK_NE(config_.samples_per_second, kInvalidSampleRate);
+  DCHECK(IsValidConfig(config_));
   mixer_input_.reset(new StreamMixerAlsaInput(
       this, config_.samples_per_second, backend_->Primary()));
   mixer_input_->SetVolumeMultiplier(volume_multiplier_);
   // Create decoder_ if necessary. This can happen if Stop() was called, and
   // SetConfig() was not called since then.
   if (!decoder_)
     CreateDecoder();
   return true;
 }
 
@@ skipping 183 matching lines @@
 void AudioDecoderAlsa::OnMixerError() {
   TRACE_FUNCTION_ENTRY0();
   DCHECK(task_runner_->BelongsToCurrentThread());
   LOG(ERROR) << "Mixer error occured.";
   error_ = true;
   delegate_->OnDecoderError();
 }
 
 }  // namespace media
 }  // namespace chromecast