alsa_output: Drain and pause pcm when stopping.

media/audio/linux/alsa_wrapper.cc

 // Copyright (c) 2012 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 "media/audio/linux/alsa_wrapper.h"
 
 #include <alsa/asoundlib.h>
 
 namespace media {
 
@@ skipping 25 matching lines @@
 }
 
 int AlsaWrapper::PcmClose(snd_pcm_t* handle) {
   return snd_pcm_close(handle);
 }
 
 int AlsaWrapper::PcmPrepare(snd_pcm_t* handle) {
   return snd_pcm_prepare(handle);
 }
 
+int AlsaWrapper::PcmDrain(snd_pcm_t* handle) {
+  return snd_pcm_drain(handle);
+}
+
 int AlsaWrapper::PcmDrop(snd_pcm_t* handle) {
   return snd_pcm_drop(handle);
 }
 
 int AlsaWrapper::PcmDelay(snd_pcm_t* handle, snd_pcm_sframes_t* delay) {
   return snd_pcm_delay(handle, delay);
 }
 
 snd_pcm_sframes_t AlsaWrapper::PcmWritei(snd_pcm_t* handle,
                                          const void* buffer,
@@ skipping 167 matching lines @@
 int AlsaWrapper::MixerSelemHasCaptureVolume(snd_mixer_elem_t* elem) {
   return snd_mixer_selem_has_capture_volume(elem);
 }
 
 int AlsaWrapper::MixerSelemGetCaptureVolumeRange(snd_mixer_elem_t* elem,
                                                  long* min, long* max) {
   return snd_mixer_selem_get_capture_volume_range(elem, min, max);
 }
 
 }  // namespace media