Enable audio capture on Android

media/audio/android/audio_manager_android.cc

Index: media/audio/android/audio_manager_android.cc
===================================================================
--- media/audio/android/audio_manager_android.cc	(revision 180886)
+++ media/audio/android/audio_manager_android.cc	(working copy)
@@ -8,10 +8,14 @@
 #include "media/audio/android/opensles_input.h"
 #include "media/audio/android/opensles_output.h"
 #include "media/audio/audio_manager.h"
+#include "media/audio/audio_util.h"
 #include "media/audio/fake_audio_input_stream.h"
 
 namespace media {
 
+static const char kAndroidInputDeviceName[] = "Mic";
+static const char kAndroidInputDeviceId[] = "mic";

[wjia(left Chromium), 2013/02/06 18:17:05]

move these 2 into anonymous namespace and remove static.

[leozwang1, 2013/02/11 08:05:00]

I removed these defines because unit test assume there must be a "default"
device.

+
 // Maximum number of output streams that can be open simultaneously.
 static const int kMaxOutputStreams = 10;
 
@@ -32,9 +36,40 @@
 }
 
 bool AudioManagerAndroid::HasAudioInputDevices() {
+  return true;
+}
+
+bool AudioManagerAndroid::CanShowAudioInputSettings() {
   return false;
 }
 
+void AudioManagerAndroid::ShowAudioInputSettings() {

[wjia(left Chromium), 2013/02/06 18:17:05]

Do you need a no-op override here? It's same def as in AudioManagerBase.

[leozwang1, 2013/02/11 08:05:00]

Done.

+}
+
+void AudioManagerAndroid::GetAudioInputDeviceNames(
+    media::AudioDeviceNames* device_names) {
+  if (device_names->empty()) {
+    device_names->push_front(media::AudioDeviceName(
+        kAndroidInputDeviceName, kAndroidInputDeviceId));
+  }
+}
+
+AudioParameters
+AudioManagerAndroid::GetPreferredLowLatencyOutputStreamParameters(
+    const AudioParameters& input_params) {
+  // TODO(leozwang): Android defines the minimal buffer size requirment
+  // we should follow it. From Android 4.1, a new audio low latency api
+  // set was introduced and is under development, we want to take advantage
+  // of it.
+  int buffer_size = GetAudioHardwareBufferSize();
+  if (input_params.frames_per_buffer() < buffer_size)
+    buffer_size = input_params.frames_per_buffer();
+
+  return AudioParameters(
+      AudioParameters::AUDIO_PCM_LOW_LATENCY, input_params.channel_layout(),
+      input_params.sample_rate(), 16, buffer_size);
+}
+
 AudioOutputStream* AudioManagerAndroid::MakeLinearOutputStream(
       const AudioParameters& params) {
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());