src/media/video/osxvideo/video_device_impl.mm

/*
 *  Copyright (C) 2015 Savoir-faire Linux Inc.
 *
 *  Author: Alexandre Lision <alexandre.lision@savoirfairelinux.com>
 *
 *  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 3 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.
 */

#include <algorithm>
#include <cassert>
#include <climits>
#include <map>
#include <string>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>

#include "logger.h"
#include "../video_device.h"

#import <AVFoundation/AVFoundation.h>

namespace ring { namespace video {

class VideoDeviceImpl {
    public:
        /**
         * @throw std::runtime_error
         */
        VideoDeviceImpl(const std::string& path);

        std::string device;
        std::string name;

        std::vector<std::string> getChannelList() const;
        std::vector<std::string> getSizeList(const std::string& channel) const;
        std::vector<std::string> getSizeList() const;
        std::vector<std::string> getRateList(const std::string& channel, const std::string& size) const;
        float getRate(unsigned rate) const;

        VideoSettings getSettings() const;
        void applySettings(VideoSettings settings);

        DeviceParams getDeviceParams() const;

    private:
        AVCaptureDevice* avDevice_;
};

VideoDeviceImpl::VideoDeviceImpl(const std::string& uniqueID)
    : device(uniqueID)
    , avDevice_([AVCaptureDevice deviceWithUniqueID:
        [NSString stringWithCString:uniqueID.c_str() encoding:[NSString defaultCStringEncoding]]])
{
    name = [[avDevice_ localizedName] UTF8String];
    // Set default settings
    applySettings(VideoSettings());
}

void
VideoDeviceImpl::applySettings(VideoSettings settings)
{
//TODO: not supported for now on OSX
// Set preferences or fallback to defaults.
//    channel_ = getChannel(settings["channel"]);
//    size_ = channel_.getSize(settings["size"]);
//    rate_ = size_.getRate(settings["rate"]);
}

DeviceParams
VideoDeviceImpl::getDeviceParams() const
{
    DeviceParams params;
    params.input = "[" + device + "]";
    params.format = "avfoundation";
// No channel support for now
//    params.channel = channel_.idx;
    auto format = [avDevice_ activeFormat];
    CMVideoDimensions dimensions =
                CMVideoFormatDescriptionGetDimensions(format.formatDescription);
    params.width = dimensions.width;
    params.height = dimensions.height;
    auto frameRate = (AVFrameRateRange*)
                    [format.videoSupportedFrameRateRanges objectAtIndex:0];
    params.framerate = frameRate.maxFrameRate;
    return params;
}

VideoSettings
VideoDeviceImpl::getSettings() const
{
    VideoSettings settings;

    settings.name = [[avDevice_ localizedName] UTF8String];

    return settings;
}

VideoDevice::VideoDevice(const std::string& path) :
    deviceImpl_(new VideoDeviceImpl(path))
{
    node_ = path;
    name = deviceImpl_->name;
}

DeviceParams
VideoDevice::getDeviceParams() const
{
    return deviceImpl_->getDeviceParams();
}

void
VideoDevice::applySettings(VideoSettings settings)
{
    deviceImpl_->applySettings(settings);
}

VideoSettings
VideoDevice::getSettings() const
{
    return deviceImpl_->getSettings();
}

std::vector<std::string>
VideoDeviceImpl::getSizeList() const
{
    return getSizeList("default");
}

std::vector<std::string>
VideoDeviceImpl::getRateList(const std::string& channel, const std::string& size) const
{
    auto format = [avDevice_ activeFormat];
    std::vector<std::string> v;

    for (AVFrameRateRange* frameRateRange in format.videoSupportedFrameRateRanges) {
      std::stringstream ss;
        ss << frameRateRange.maxFrameRate;
        v.push_back(ss.str());
    }
    return v;
}

std::vector<std::string>
VideoDeviceImpl::getSizeList(const std::string& channel) const
{
    std::vector<std::string> v;

    for (AVCaptureDeviceFormat* format in avDevice_.formats) {
      std::stringstream ss;
      auto dimensions = CMVideoFormatDescriptionGetDimensions(format.formatDescription);
        ss << dimensions.width << "x" << dimensions.height;
        v.push_back(ss.str());
    }
    return v;
}

std::vector<std::string> VideoDeviceImpl::getChannelList() const
{
    return {"default"};
}

DRing::VideoCapabilities
VideoDevice::getCapabilities() const
{
    DRing::VideoCapabilities cap;

    for (const auto& chan : deviceImpl_->getChannelList())
        for (const auto& size : deviceImpl_->getSizeList(chan))
            cap[chan][size] = deviceImpl_->getRateList(chan, size);

    return cap;
}

VideoDevice::~VideoDevice()
{}

}} // namespace ring::video