cinelerra-5.1/cinelerra/vdevicev4l2jpeg.C

   1
   2 /*
   3  * CINELERRA
   4  * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_VIDEO4LINUX2
  23 #include "channel.h"
  24 #include "file.h"
  25 #include "libmjpeg.h"
  26 #include "preferences.h"
  27 #include "recordconfig.h"
  28 #include "vdevicev4l2jpeg.h"
  29 #include "vframe.h"
  30 #include "videodevice.h"
  31
  32 #include <string.h>
  33
  34 VDeviceV4L2JPEG::VDeviceV4L2JPEG(VideoDevice *device)
  35  : VDeviceBase(device), DeviceV4L2Base()
  36 {
  37 }
  38
  39 VDeviceV4L2JPEG::~VDeviceV4L2JPEG()
  40 {
  41         close_all();
  42 }
  43
  44 int VDeviceV4L2JPEG::close_all()
  45 {
  46         close_dev();
  47         return 0;
  48 }
  49
  50 int VDeviceV4L2JPEG::open_input()
  51 {
  52         int result = get_sources();
  53         return result;
  54 }
  55
  56 int VDeviceV4L2JPEG::get_best_colormodel(Asset *asset)
  57 {
  58         return BC_COMPRESSED;
  59 }
  60
  61 int VDeviceV4L2JPEG::has_signal()
  62 {
  63         return !status_dev() ? dev_signal() : 0;
  64 }
  65
  66 int VDeviceV4L2JPEG::read_buffer(VFrame *frame)
  67 {
  68         int result = 0;
  69
  70         if(is_opened())
  71         {
  72                 if(device->channel_changed || device->picture_changed)
  73                         close_dev();
  74         }
  75
  76         if(!is_opened())
  77         {
  78                 result = open_dev(frame->get_color_model());
  79                 if( !result )
  80                 {
  81                         device->channel_changed = 0;
  82                         device->picture_changed = 0;
  83                 }
  84         }
  85
  86 // Get buffer from thread
  87         if( !result )
  88         {
  89                 int bfr = get_buffer();
  90                 if(bfr >= 0)
  91                 {
  92                         VFrame *buffer = device_buffer(bfr);
  93                         frame->set_timestamp(buffer->get_timestamp());
  94                         frame->allocate_compressed_data(buffer->get_compressed_size());
  95                         frame->set_compressed_size(buffer->get_compressed_size());
  96
  97 // Transfer fields to frame
  98                         if(device->odd_field_first)
  99                         {
 100                                 int field2_offset = mjpeg_get_field2((unsigned char*)buffer->get_data(),
 101                                         buffer->get_compressed_size());
 102                                 int field1_len = field2_offset;
 103                                 int field2_len = buffer->get_compressed_size() -
 104                                         field2_offset;
 105
 106                                 memcpy(frame->get_data(),
 107                                         buffer->get_data() + field2_offset,
 108                                         field2_len);
 109                                 memcpy(frame->get_data() + field2_len,
 110                                         buffer->get_data(),
 111                                         field1_len);
 112                         }
 113                         else
 114                         {
 115                                 bcopy(buffer->get_data(),
 116                                         frame->get_data(),
 117                                         buffer->get_compressed_size());
 118                         }
 119
 120                         put_buffer(bfr);
 121                 }
 122                 else
 123                         result = 1;
 124         }
 125
 126         if( result )
 127                 close_dev();
 128
 129         return result;
 130 }
 131
 132 #endif