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// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cobalt/speech/microphone_fake.h"
#if defined(ENABLE_FAKE_MICROPHONE)
#include <algorithm>
#include "base/file_util.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/rand_util.h"
#include "cobalt/audio/audio_file_reader.h"
#include "starboard/file.h"
#include "starboard/memory.h"
#include "starboard/time.h"
namespace cobalt {
namespace speech {
typedef audio::ShellAudioBus ShellAudioBus;
namespace {
const int kMaxBufferSize = 1024 * 1024;
const int kMinMicrophoneReadInBytes = 1024;
// The possiblity of microphone creation failed is 1/20.
const int kCreationRange = 20;
// The possiblity of microphone open failed is 1/20.
const int kOpenRange = 20;
// The possiblity of microphone read failed is 1/300.
const int kReadRange = 300;
// The possiblity of microphone close failed is 1/20.
const int kCloseRange = 20;
const int kFailureNumber = 5;
const int kSupportedMonoChannel = 1;
const char kMicrophoneLabel[] = "FakeMicrophone";
bool ShouldFail(int range) {
return base::RandGenerator(range) == kFailureNumber;
}
} // namespace
MicrophoneFake::MicrophoneFake(const Options& options)
: Microphone(),
read_data_from_file_(options.audio_data_size == 0),
file_length_(-1),
read_index_(0),
is_valid_(!ShouldFail(kCreationRange)) {
if (!is_valid_) {
DLOG(WARNING) << "Mocking microphone creation failed.";
return;
}
if (read_data_from_file_) {
if (options.file_path) {
DCHECK(!options.file_path->empty());
// External input file.
file_paths_.push_back(options.file_path.value());
} else {
FilePath audio_files_path;
CHECK(PathService::Get(base::DIR_TEST_DATA, &audio_files_path));
audio_files_path = audio_files_path.Append(FILE_PATH_LITERAL("cobalt"))
.Append(FILE_PATH_LITERAL("speech"))
.Append(FILE_PATH_LITERAL("testdata"));
file_util::FileEnumerator file_enumerator(
audio_files_path, false /* Not recursive */,
file_util::FileEnumerator::FILES);
for (FilePath next = file_enumerator.Next(); !next.empty();
next = file_enumerator.Next()) {
file_paths_.push_back(next);
}
}
} else {
file_length_ = std::min(options.audio_data_size, kMaxBufferSize);
DCHECK_GT(file_length_, 0);
audio_bus_.reset(new ShellAudioBus(
kSupportedMonoChannel,
file_length_ / audio::GetSampleTypeSize(ShellAudioBus::kInt16),
ShellAudioBus::kInt16, ShellAudioBus::kInterleaved));
SbMemoryCopy(audio_bus_->interleaved_data(), options.external_audio_data,
file_length_);
}
}
bool MicrophoneFake::Open() {
DCHECK(thread_checker_.CalledOnValidThread());
if (ShouldFail(kOpenRange)) {
DLOG(WARNING) << "Mocking microphone open failed.";
return false;
}
if (read_data_from_file_) {
// Read from local files.
DCHECK_NE(file_paths_.size(), 0u);
size_t random_index =
static_cast<size_t>(base::RandGenerator(file_paths_.size()));
starboard::ScopedFile file(file_paths_[random_index].value().c_str(),
kSbFileOpenOnly | kSbFileRead, NULL, NULL);
DCHECK(file.IsValid());
int file_buffer_size =
std::min(static_cast<int>(file.GetSize()), kMaxBufferSize);
DCHECK_GT(file_buffer_size, 0);
scoped_array<char> audio_input(new char[file_buffer_size]);
int read_bytes = file.ReadAll(audio_input.get(), file_buffer_size);
if (read_bytes < 0) {
return false;
}
scoped_ptr<audio::AudioFileReader> reader(audio::AudioFileReader::TryCreate(
reinterpret_cast<const uint8*>(audio_input.get()), file_buffer_size,
audio::kSampleTypeInt16));
const float kSupportedSampleRate = 16000.0f;
if (!reader) {
// If it is not a WAV file, read audio data as raw audio.
audio_bus_.reset(new ShellAudioBus(
kSupportedMonoChannel,
file_buffer_size / audio::GetSampleTypeSize(ShellAudioBus::kInt16),
ShellAudioBus::kInt16, ShellAudioBus::kInterleaved));
SbMemoryCopy(audio_bus_->interleaved_data(), audio_input.get(),
file_buffer_size);
file_length_ = file_buffer_size;
} else if (reader->sample_type() != ShellAudioBus::kInt16 ||
reader->sample_rate() != kSupportedSampleRate ||
reader->number_of_channels() != kSupportedMonoChannel) {
// If it is a WAV file but it doesn't meet the audio input criteria, treat
// it as an error.
return false;
} else {
audio_bus_ = reader->ResetAndReturnAudioBus().Pass();
file_length_ =
static_cast<int>(reader->number_of_frames() *
audio::GetSampleTypeSize(reader->sample_type()));
}
}
return true;
}
int MicrophoneFake::Read(char* out_data, int data_size) {
DCHECK(thread_checker_.CalledOnValidThread());
if (ShouldFail(kReadRange)) {
DLOG(WARNING) << "Mocking microphone read failed.";
return -1;
}
int copy_bytes = std::min(file_length_ - read_index_, data_size);
SbMemoryCopy(out_data, audio_bus_->interleaved_data() + read_index_,
copy_bytes);
read_index_ += copy_bytes;
if (read_index_ == file_length_) {
read_index_ = 0;
}
return copy_bytes;
}
bool MicrophoneFake::Close() {
DCHECK(thread_checker_.CalledOnValidThread());
if (read_data_from_file_) {
audio_bus_.reset();
file_length_ = -1;
}
read_index_ = 0;
if (ShouldFail(kCloseRange)) {
DLOG(WARNING) << "Mocking microphone close failed.";
return false;
}
return true;
}
int MicrophoneFake::MinMicrophoneReadInBytes() {
return kMinMicrophoneReadInBytes;
}
const char* MicrophoneFake::Label() { return kMicrophoneLabel; }
} // namespace speech
} // namespace cobalt
#endif // defined(ENABLE_FAKE_MICROPHONE)