fixed_delay.h

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/*
 * Copyright (C) 2016 Robin Gareus <robin@gareus.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include <vector>
#include "ardour/buffer.h"
 
namespace ARDOUR {
 
class ChanCount;
 
class LIBARDOUR_API FixedDelay
{
public:
        FixedDelay ();
        ~FixedDelay ();
 
        void configure (const ChanCount& count, samplecnt_t max_delay, bool shrink = true);
 
        void set (const ChanCount& count, samplecnt_t delay);
 
        void delay (ARDOUR::DataType dt, uint32_t id, Buffer& out, const Buffer& in, pframes_t n_samples, samplecnt_t dst_offset = 0, samplecnt_t src_offset = 0);
 
        void flush();
 
        samplecnt_t delay () const { return _delay; }
 
private:
        samplecnt_t _max_delay;
        samplecnt_t _buf_size;
        samplecnt_t _delay;
        ChanCount  _count;
 
        struct DelayBuffer {
                public:
                DelayBuffer () : buf (0), pos (0) {}
                DelayBuffer (DataType dt, size_t capacity)
                        : buf (Buffer::create (dt, capacity)), pos (0) {}
                ~DelayBuffer () { delete buf; }
                Buffer * buf;
                samplepos_t pos;
        };
 
        typedef std::vector<DelayBuffer*> BufferVec;
        // Vector of vectors, indexed by DataType
        std::vector<BufferVec> _buffers;
 
        void ensure_buffers(DataType type, size_t num_buffers, size_t buffer_capacity);
        void clear ();
};
 
} // namespace ARDOUR