portapack-mayhem/firmware/application/capture_thread.cpp

/*
 * Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
 *
 * This file is part of PortaPack.
 *
 * 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, 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include "capture_thread.hpp"

#include "baseband_api.hpp"
#include "buffer_exchange.hpp"

struct BasebandCapture {
    BasebandCapture(CaptureConfig* const config) {
        baseband::capture_start(config);
    }

    ~BasebandCapture() {
        baseband::capture_stop();
    }
};

// CaptureThread //////////////////////////////////////////////////////////

CaptureThread::CaptureThread(
    std::unique_ptr<stream::Writer> writer,
    size_t write_size,
    size_t buffer_count,
    std::function<void()> success_callback,
    std::function<void(File::Error)> error_callback)
    : config{write_size, buffer_count},
      writer{std::move(writer)},
      success_callback{std::move(success_callback)},
      error_callback{std::move(error_callback)} {
    // Need significant stack for FATFS
    thread = chThdCreateFromHeap(NULL, 1024, NORMALPRIO + 10, CaptureThread::static_fn, this);
}

CaptureThread::~CaptureThread() {
    if (thread) {
        chThdTerminate(thread);
        chThdWait(thread);
        thread = nullptr;
    }
}

msg_t CaptureThread::static_fn(void* arg) {
    auto obj = static_cast<CaptureThread*>(arg);
    const auto error = obj->run();
    if (error.is_valid() && obj->error_callback) {
        obj->error_callback(error.value());
    } else {
        if (obj->success_callback) {
            obj->success_callback();
        }
    }
    return 0;
}

Optional<File::Error> CaptureThread::run() {
    BasebandCapture capture{&config};
    BufferExchange buffers{&config};

    while (!chThdShouldTerminate()) {
        auto buffer = buffers.get();
        auto write_result = writer->write(buffer->data(), buffer->size());
        if (write_result.is_error()) {
            return write_result.error();
        }
        buffer->empty();
        buffers.put(buffer);
    }

    return {};
}