Make fake audio file playback loop by default.

media/audio/fake_audio_input_stream.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/fake_audio_input_stream.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
+#include "base/strings/string_split.h"
 #include "base/time/time.h"
 #include "media/audio/audio_manager_base.h"
 #include "media/audio/simple_sources.h"
 #include "media/base/audio_bus.h"
 #include "media/base/media_switches.h"
 
 namespace media {
 
 AudioInputStream* FakeAudioInputStream::MakeFakeStream(
     AudioManagerBase* manager,
@@ skipping 79 matching lines @@
   audio_source_->OnMoreData(audio_bus_.get(), kNoDelay, 0);
   callback_->OnData(this, audio_bus_.get(), 0, 1.0);
 }
 
 using AudioSourceCallback = AudioOutputStream::AudioSourceCallback;
 std::unique_ptr<AudioSourceCallback> FakeAudioInputStream::ChooseSource() {
   DCHECK(audio_manager_->GetWorkerTaskRunner()->BelongsToCurrentThread());
 
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kUseFileForFakeAudioCapture)) {
-    base::FilePath path_to_wav_file =
-        base::CommandLine::ForCurrentProcess()->GetSwitchValuePath(
+    base::CommandLine::StringType switch_value =
+        base::CommandLine::ForCurrentProcess()->GetSwitchValueNative(
             switches::kUseFileForFakeAudioCapture);
-    CHECK(!path_to_wav_file.empty())
-        << "You must pass the file to use as argument to --"
-        << switches::kUseFileForFakeAudioCapture << ".";
-
-    return base::WrapUnique(new FileSource(params_, path_to_wav_file));
+    std::vector<std::string> parameters = base::SplitString(
+        switch_value, "!", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
+    CHECK(parameters.size() > 0) << "You must pass <file>[!noloop] to  --"
+                                 << switches::kUseFileForFakeAudioCapture
+                                 << ".";
+    base::FilePath path_to_wav_file = base::FilePath(parameters[0]);
+    bool looping = true;
+    if (parameters.size() == 2) {
+      CHECK(parameters[1] == "noloop")
+          << "Unknown parameter " << parameters[1] << " to "
+          << switches::kUseFileForFakeAudioCapture << ".";
+      looping = false;
+    }
+    return base::WrapUnique(new FileSource(params_, path_to_wav_file, looping));
   }
   return base::WrapUnique(new BeepingSource(params_));
 }
 
 void FakeAudioInputStream::BeepOnce() {
   BeepingSource::BeepOnce();
 }
 
 }  // namespace media