thread_buffers.cc

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/*
    Copyright (C) 2010 Paul Davis

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <iostream>
#include <algorithm>

#include "ardour/audioengine.h"
#include "ardour/buffer_set.h"
#include "ardour/thread_buffers.h"

using namespace ARDOUR;
using namespace std;

ThreadBuffers::ThreadBuffers ()
        : silent_buffers (new BufferSet)
        , scratch_buffers (new BufferSet)
        , route_buffers (new BufferSet)
        , mix_buffers (new BufferSet)
        , gain_automation_buffer (0)
        , trim_automation_buffer (0)
        , send_gain_automation_buffer (0)
        , pan_automation_buffer (0)
        , npan_buffers (0)
{
}

void
ThreadBuffers::ensure_buffers (ChanCount howmany, size_t custom)
{
        // std::cerr << "ThreadBuffers " << this << " resize buffers with count = " << howmany << std::endl;

        /* this is all protected by the process lock in the Session
         */

        /* we always need at least 1 midi buffer */
        if (howmany.n_midi() < 1) {
                howmany.set_midi(1);
        }

        if (howmany.n_audio() == 0 && howmany.n_midi() == 1) {
                return;
        }

        AudioEngine* _engine = AudioEngine::instance ();

        for (DataType::iterator t = DataType::begin(); t != DataType::end(); ++t) {
                size_t count = std::max (scratch_buffers->available().get(*t), howmany.get(*t));
                size_t size;
                if (custom > 0) {
                        size = custom;
                } else {
                        size = (*t == DataType::MIDI)
                                ? _engine->raw_buffer_size (*t)
                                : _engine->raw_buffer_size (*t) / sizeof (Sample);
                }

                scratch_buffers->ensure_buffers (*t, count, size);
                mix_buffers->ensure_buffers (*t, count, size);
                silent_buffers->ensure_buffers (*t, count, size);
                route_buffers->ensure_buffers (*t, count, size);
        }

        size_t audio_buffer_size = custom > 0 ? custom : _engine->raw_buffer_size (DataType::AUDIO) / sizeof (Sample);

        delete [] gain_automation_buffer;
        gain_automation_buffer = new gain_t[audio_buffer_size];
        delete [] trim_automation_buffer;
        trim_automation_buffer = new gain_t[audio_buffer_size];
        delete [] send_gain_automation_buffer;
        send_gain_automation_buffer = new gain_t[audio_buffer_size];

        allocate_pan_automation_buffers (audio_buffer_size, howmany.n_audio(), false);
}

void
ThreadBuffers::allocate_pan_automation_buffers (framecnt_t nframes, uint32_t howmany, bool force)
{
        /* we always need at least 2 pan buffers */

        howmany = max (2U, howmany);

        if (!force && howmany <= npan_buffers) {
                return;
        }

        if (pan_automation_buffer) {

                for (uint32_t i = 0; i < npan_buffers; ++i) {
                        delete [] pan_automation_buffer[i];
                }

                delete [] pan_automation_buffer;
        }

        pan_automation_buffer = new pan_t*[howmany];

        for (uint32_t i = 0; i < howmany; ++i) {
                pan_automation_buffer[i] = new pan_t[nframes];
        }

        npan_buffers = howmany;
}