add audio-buffer-size command line flag support to the input audio for all the platforms

media/audio/pulse/audio_manager_pulse.cc

 // Copyright 2013 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/pulse/audio_manager_pulse.h"
 
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 17 matching lines @@
 #endif  // defined(DLOPEN_PULSEAUDIO)
 
 namespace media {
 
 using pulse::AutoPulseLock;
 using pulse::WaitForOperationCompletion;
 
 // Maximum number of output streams that can be open simultaneously.
 static const int kMaxOutputStreams = 50;
 
-// Define bounds for the output buffer size.
+// Minimum bound for the output buffer size.
 static const int kMinimumOutputBufferSize = 512;
-static const int kMaximumOutputBufferSize = 8192;
+
+// Maximum bound for the input and output buffer size
+static const int kMaximumBufferSize = 8192;
 
 // Default input buffer size.
 static const int kDefaultInputBufferSize = 1024;
 
 static const base::FilePath::CharType kPulseLib[] =
     FILE_PATH_LITERAL("libpulse.so.0");
 
 // static
 AudioManager* AudioManagerPulse::Create(AudioLogFactory* audio_log_factory) {
   scoped_ptr<AudioManagerPulse> ret(new AudioManagerPulse(audio_log_factory));
@@ skipping 68 matching lines @@
 void AudioManagerPulse::GetAudioInputDeviceNames(
     AudioDeviceNames* device_names) {
   GetAudioDeviceNames(true, device_names);
 }
 
 void AudioManagerPulse::GetAudioOutputDeviceNames(
     AudioDeviceNames* device_names) {
   GetAudioDeviceNames(false, device_names);
 }
 
-AudioParameters AudioManagerPulse::GetInputStreamParameters(
-    const std::string& device_id) {
+AudioParameters AudioManagerPulse::GetPreferredInputStreamParameters(
+    const std::string& input_device_id,
+    const AudioParameters& input_params) {
+  // TODO(xians): add support for querying native channel layout for pulse.
+  ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
+  int buffer_size = kDefaultInputBufferSize;
+  int bits_per_sample = 16;
+  int input_channels = 0;
+  int sample_rate = GetNativeSampleRate();
+  if (input_params.IsValid()) {
+    bits_per_sample = input_params.bits_per_sample();
+    channel_layout = input_params.channel_layout();
+    input_channels = input_params.input_channels();
+    buffer_size = std::min(kMaximumBufferSize,
+                           input_params.frames_per_buffer());
+    sample_rate = input_params.sample_rate();
+  }
+
   int user_buffer_size = GetUserBufferSize();
-  int buffer_size = user_buffer_size ?
-      user_buffer_size : kDefaultInputBufferSize;
+  if (user_buffer_size)
+    buffer_size = user_buffer_size;
 
-  // TODO(xians): add support for querying native channel layout for pulse.
   return AudioParameters(
-      AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
-      GetNativeSampleRate(), 16, buffer_size);
+      AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout, input_channels,
+      sample_rate, bits_per_sample, buffer_size, AudioParameters::NO_EFFECTS);
 }
 
 AudioOutputStream* AudioManagerPulse::MakeLinearOutputStream(
     const AudioParameters& params) {
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
   return MakeOutputStream(params, AudioManagerBase::kDefaultDeviceId);
 }
 
 AudioOutputStream* AudioManagerPulse::MakeLowLatencyOutputStream(
     const AudioParameters& params,
@@ skipping 19 matching lines @@
 AudioParameters AudioManagerPulse::GetPreferredOutputStreamParameters(
     const std::string& output_device_id,
     const AudioParameters& input_params) {
   // TODO(tommi): Support |output_device_id|.
   VLOG_IF(0, !output_device_id.empty()) << "Not implemented!";
 
   ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
   int buffer_size = kMinimumOutputBufferSize;
   int bits_per_sample = 16;
   int input_channels = 0;
-  int sample_rate;
+  int sample_rate = 0;
   if (input_params.IsValid()) {
     bits_per_sample = input_params.bits_per_sample();
     channel_layout = input_params.channel_layout();
     input_channels = input_params.input_channels();
     buffer_size =
-        std::min(kMaximumOutputBufferSize,
+        std::min(kMaximumBufferSize,
                  std::max(buffer_size, input_params.frames_per_buffer()));
     sample_rate = input_params.sample_rate();
   } else {
     sample_rate = GetNativeSampleRate();
   }
 
   int user_buffer_size = GetUserBufferSize();
   if (user_buffer_size)
     buffer_size = user_buffer_size;
 
@@ skipping 141 matching lines @@
 void AudioManagerPulse::SampleRateInfoCallback(pa_context* context,
                                                const pa_server_info* info,
                                                void* user_data) {
   AudioManagerPulse* manager = reinterpret_cast<AudioManagerPulse*>(user_data);
 
   manager->native_input_sample_rate_ = info->sample_spec.rate;
   pa_threaded_mainloop_signal(manager->input_mainloop_, 0);
 }
 
 }  // namespace media