vdevicev4l2jpeg.C

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// V4L2 is incompatible with large file support
#undef _FILE_OFFSET_BITS
#undef _LARGEFILE_SOURCE
#undef _LARGEFILE64_SOURCE


#include "assets.h"
#include "channel.h"
#include "chantables.h"
#include "clip.h"
#include "condition.h"
#include "file.h"
#include "libmjpeg.h"
#include "picture.h"
#include "preferences.h"
#include "quicktime.h"
#include "recordconfig.h"
#include "vdevicev4l2jpeg.h"
#include "vdevicev4l2.h"
#include "vframe.h"
#include "videodevice.h"

#ifdef HAVE_VIDEO4LINUX2

#include <fcntl.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>








VDeviceV4L2JPEG::VDeviceV4L2JPEG(VideoDevice *device)
 : VDeviceBase(device)
{
        initialize();
}

VDeviceV4L2JPEG::~VDeviceV4L2JPEG()
{
        close_all();
}

int VDeviceV4L2JPEG::initialize()
{
        thread = 0;
}


int VDeviceV4L2JPEG::open_input()
{
        return VDeviceV4L2::get_sources(device,
                device->in_config->v4l2jpeg_in_device);
}

int VDeviceV4L2JPEG::close_all()
{
        if(thread) delete thread;
        thread = 0;
        return 0;
}

int VDeviceV4L2JPEG::get_best_colormodel(Asset *asset)
{
        return BC_COMPRESSED;
}

int VDeviceV4L2JPEG::read_buffer(VFrame *frame)
{
        int result = 0;

        if((device->channel_changed || device->picture_changed) && thread)
        {
                delete thread;
                thread = 0;
        }

        if(!thread)
        {
                device->channel_changed = 0;
                device->picture_changed = 0;
                thread = new VDeviceV4L2Thread(device, BC_COMPRESSED);
                thread->start();
        }


// Get buffer from thread
        int timed_out;
        VFrame *buffer = thread->get_buffer(&timed_out);



        if(buffer)
        {
                frame->allocate_compressed_data(buffer->get_compressed_size());
                frame->set_compressed_size(buffer->get_compressed_size());

// Transfer fields to frame
                if(device->odd_field_first)
                {
                        int field2_offset = mjpeg_get_field2((unsigned char*)buffer->get_data(), 
                                buffer->get_compressed_size());
                        int field1_len = field2_offset;
                        int field2_len = buffer->get_compressed_size() - 
                                field2_offset;

                        memcpy(frame->get_data(), 
                                buffer->get_data() + field2_offset, 
                                field2_len);
                        memcpy(frame->get_data() + field2_len, 
                                buffer->get_data(), 
                                field1_len);
                }
                else
                {
                        bcopy(buffer->get_data(), 
                                frame->get_data(), 
                                buffer->get_compressed_size());
                }

                thread->put_buffer();
        }
        else
        {
// Driver in 2.6.3 needs to be restarted when it loses sync.
                if(timed_out)
                {
                        delete thread;
                        thread = 0;
                }
                result = 1;
        }


        return result;
}



#endif

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