[Chromecast] Implement new volume control API

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 90 matching lines @@
   pending_output_frames_ = kNoPendingOutput;
 
   last_mixer_delay_.timestamp_microseconds = kInvalidTimestamp;
   last_mixer_delay_.delay_microseconds = 0;
 }
 
 bool AudioDecoderAlsa::Start(int64_t start_pts) {
   TRACE_FUNCTION_ENTRY0();
   current_pts_ = start_pts;
   DCHECK(IsValidConfig(config_));
-  mixer_input_.reset(new StreamMixerAlsaInput(this, config_.samples_per_second,
-                                              backend_->Primary(),
-                                              backend_->DeviceId()));
+  mixer_input_.reset(new StreamMixerAlsaInput(
+      this, config_.samples_per_second, backend_->Primary(),
+      backend_->DeviceId(), backend_->ContentType()));
   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();
   }
   if (!rate_shifter_) {
     CreateRateShifter(config_.samples_per_second);
   }
   return true;
@@ skipping 107 matching lines @@
       (config.samples_per_second != config_.samples_per_second);
 
   if (!rate_shifter_ || changed_sample_rate) {
     CreateRateShifter(config.samples_per_second);
   }
 
   if (mixer_input_ && changed_sample_rate) {
     // Destroy the old input first to ensure that the mixer output sample rate
     // is updated.
     mixer_input_.reset();
-    mixer_input_.reset(new StreamMixerAlsaInput(this, config.samples_per_second,
-                                                backend_->Primary(),
-                                                backend_->DeviceId()));
+    mixer_input_.reset(new StreamMixerAlsaInput(
+        this, config.samples_per_second, backend_->Primary(),
+        backend_->DeviceId(), backend_->ContentType()));
     mixer_input_->SetVolumeMultiplier(volume_multiplier_);
     pending_output_frames_ = kNoPendingOutput;
   }
 
   config_ = config;
   decoder_.reset();
   CreateDecoder();
 
   if (pending_buffer_complete_ && changed_sample_rate) {
     pending_buffer_complete_ = false;
@@ skipping 284 matching lines @@
   TRACE_FUNCTION_ENTRY0();
   DCHECK(task_runner_->BelongsToCurrentThread());
   if (error != MixerError::kInputIgnored)
     LOG(ERROR) << "Mixer error occurred.";
   mixer_error_ = true;
   delegate_->OnDecoderError();
 }
 
 }  // namespace media
 }  // namespace chromecast