channel_mapper_reader.h

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/*
 * Copyright (c) 2022 Roc Streaming authors
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
//! @file roc_audio/channel_mapper_reader.h
//! @brief Channel mapper reader.
 
#ifndef ROC_AUDIO_CHANNEL_MAPPER_READER_H_
#define ROC_AUDIO_CHANNEL_MAPPER_READER_H_
 
#include "roc_audio/channel_mapper.h"
#include "roc_audio/frame_factory.h"
#include "roc_audio/iframe_reader.h"
#include "roc_audio/sample_spec.h"
#include "roc_core/noncopyable.h"
#include "roc_core/slice.h"
#include "roc_core/stddefs.h"
 
namespace roc {
namespace audio {
 
//! Channel mapper reader.
//! Reads frames from nested reader and maps them to another channel mask.
class ChannelMapperReader : public IFrameReader, public core::NonCopyable<> {
public:
    //! Initialize.
    ChannelMapperReader(IFrameReader& reader,
                        FrameFactory& frame_factory,
                        const SampleSpec& in_spec,
                        const SampleSpec& out_spec);
 
    //! Check if the object was succefully constructed.
    bool is_valid() const;
 
    //! Read audio frame.
    virtual bool read(Frame& frame);
 
private:
    bool read_(sample_t* out_samples,
               size_t n_samples,
               unsigned& flags,
               core::nanoseconds_t& capt_ts);
 
    IFrameReader& input_reader_;
    core::Slice<sample_t> input_buf_;
 
    ChannelMapper mapper_;
 
    const SampleSpec in_spec_;
    const SampleSpec out_spec_;
 
    bool valid_;
};
 
} // namespace audio
} // namespace roc
 
#endif // ROC_AUDIO_CHANNEL_MAPPER_READER_H_