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/*
Copyright 2018 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.
*/
#ifndef RESONANCE_AUDIO_UTILS_OGG_VORBIS_RECORDER_H_
#define RESONANCE_AUDIO_UTILS_OGG_VORBIS_RECORDER_H_
#include <memory>
#include <vector>
#include "base/audio_buffer.h"
#include "utils/buffer_crossfader.h"
#include "utils/vorbis_stream_encoder.h"
namespace vraudio {
// Class that takes audio buffers as input and writes them into a compressed OGG
// Vorbis file.
class OggVorbisRecorder {
public:
// Constructs a new recorder with given sampling rate and number of channels.
OggVorbisRecorder(int sample_rate_hz, size_t num_channels, size_t num_frames,
size_t max_num_buffers);
// Adds next input buffer at the end of the record data.
//
// @param input_buffer Next audio buffer to be recorded.
void AddInput(std::unique_ptr<AudioBuffer> input_buffer);
// Flushes the record data.
void Reset();
// Writes the current record data into a file and resets the recorder.
//
// @param file_path Full path of the file to be recorded into.
// @param quality Compression quality of the record. The usable range is from
// -0.1 (lowest quality, smallest file) to 1.0 (highest quality, largest
// file).
// @param seamless True to record seamlessly for looping. Note that this
// option will truncate the record length by |num_frames_| samples.
// @return False if fails to successfully write data into |file_path|.
bool WriteToFile(const std::string& file_path, float quality, bool seamless);
private:
// Helper method to make record data seamless.
void MakeSeamless();
// Record sampling rate.
const int sample_rate_hz_;
// Record number of channels.
const size_t num_channels_;
// Record number of frames per buffer.
const size_t num_frames_;
// Maximum number of input buffers allowed to record.
const size_t max_num_buffers_;
// Record data that is stored as a list of planar audio buffers.
std::vector<std::unique_ptr<AudioBuffer>> data_;
// Temporary vector to extract pointers to planar channels in an
// |AudioBuffer|.
std::vector<const float*> temp_data_channel_ptrs_;
// Buffer crossfader that is used to create seamless loop.
BufferCrossfader crossfader_;
// Temporary buffer to store the crossfaded output.
AudioBuffer crossfade_buffer_;
// OGG Vorbis encoder to write record data into file in compressed format.
VorbisStreamEncoder encoder_;
};
} // namespace vraudio
#endif // RESONANCE_AUDIO_UTILS_OGG_VORBIS_RECORDER_H_
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