Implement audio recording for Linux via ALSA.

media/audio/linux/alsa_wrapper.cc

 // Copyright (c) 2010 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>
 
 AlsaWrapper::AlsaWrapper() {
 }
@@ skipping 33 matching lines @@
 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,
                                          snd_pcm_uframes_t size) {
   return snd_pcm_writei(handle, buffer, size);
 }
 
+snd_pcm_sframes_t AlsaWrapper::PcmReadi(snd_pcm_t* handle,
+                                        void* buffer,
+                                        snd_pcm_uframes_t size) {
+  return snd_pcm_readi(handle, buffer, size);
+}
+
 int AlsaWrapper::PcmRecover(snd_pcm_t* handle, int err, int silent) {
   return snd_pcm_recover(handle, err, silent);
 }
 
 const char* AlsaWrapper::PcmName(snd_pcm_t* handle) {
   return snd_pcm_name(handle);
 }
 
 int AlsaWrapper::PcmSetParams(snd_pcm_t* handle, snd_pcm_format_t format,
                               snd_pcm_access_t access, unsigned int channels,
@@ skipping 12 matching lines @@
   return snd_pcm_avail_update(handle);
 }
 
 snd_pcm_state_t AlsaWrapper::PcmState(snd_pcm_t* handle) {
   return snd_pcm_state(handle);
 }
 
 const char* AlsaWrapper::StrError(int errnum) {
   return snd_strerror(errnum);
 }
+
+int AlsaWrapper::PcmStart(snd_pcm_t* handle) {
+  return snd_pcm_start(handle);
+}
+