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/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_AUDIO_CODING_NETEQ_TOOLS_AUDIO_LOOP_H_
#define MODULES_AUDIO_CODING_NETEQ_TOOLS_AUDIO_LOOP_H_
#include <memory>
#include <string>
#include "absl/strings/string_view.h"
#include "api/array_view.h"
namespace webrtc {
namespace test {
// Class serving as an infinite source of audio, realized by looping an audio
// clip.
class AudioLoop {
public:
AudioLoop()
: next_index_(0), loop_length_samples_(0), block_length_samples_(0) {}
virtual ~AudioLoop() {}
AudioLoop(const AudioLoop&) = delete;
AudioLoop& operator=(const AudioLoop&) = delete;
// Initializes the AudioLoop by reading from `file_name`. The loop will be no
// longer than `max_loop_length_samples`, if the length of the file is
// greater. Otherwise, the loop length is the same as the file length.
// The audio will be delivered in blocks of `block_length_samples`.
// Returns false if the initialization failed, otherwise true.
bool Init(absl::string_view file_name,
size_t max_loop_length_samples,
size_t block_length_samples);
// Returns a (pointer,size) pair for the next block of audio. The size is
// equal to the `block_length_samples` Init() argument.
rtc::ArrayView<const int16_t> GetNextBlock();
private:
size_t next_index_;
size_t loop_length_samples_;
size_t block_length_samples_;
std::unique_ptr<int16_t[]> audio_array_;
};
} // namespace test
} // namespace webrtc
#endif // MODULES_AUDIO_CODING_NETEQ_TOOLS_AUDIO_LOOP_H_
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