cinelerra-5.0/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 #include "../hvirtual_config.h"
  23 #ifdef HAVE_VIDEO4LINUX2
  24 #include "channel.h"
  25 #include "file.h"
  26 #include "libmjpeg.h"
  27 #include "preferences.h"
  28 #include "recordconfig.h"
  29 #include "vdevicev4l2jpeg.h"
  30 #include "vframe.h"
  31 #include "videodevice.h"
  32
  33 #include <string.h>
  34
  35 VDeviceV4L2JPEG::VDeviceV4L2JPEG(VideoDevice *device)
  36  : VDeviceBase(device), DeviceV4L2Base()
  37 {
  38 }
  39
  40 VDeviceV4L2JPEG::~VDeviceV4L2JPEG()
  41 {
  42         close_all();
  43 }
  44
  45 int VDeviceV4L2JPEG::close_all()
  46 {
  47         close_dev();
  48         return 0;
  49 }
  50
  51 int VDeviceV4L2JPEG::open_input()
  52 {
  53         int result = get_sources();
  54         return result;
  55 }
  56
  57 int VDeviceV4L2JPEG::get_best_colormodel(Asset *asset)
  58 {
  59         return BC_COMPRESSED;
  60 }
  61
  62 int VDeviceV4L2JPEG::has_signal()
  63 {
  64         return !status_dev() ? dev_signal() : 0;
  65 }
  66
  67 int VDeviceV4L2JPEG::read_buffer(VFrame *frame)
  68 {
  69         int result = 0;
  70
  71         if(is_opened())
  72         {
  73                 if(device->channel_changed || device->picture_changed)
  74                         close_dev();
  75         }
  76
  77         if(!is_opened())
  78         {
  79                 result = open_dev(frame->get_color_model());
  80                 if( !result )
  81                 {
  82                         device->channel_changed = 0;
  83                         device->picture_changed = 0;
  84                 }
  85         }
  86
  87 // Get buffer from thread
  88         if( !result )
  89         {
  90                 int bfr = get_buffer();
  91                 if(bfr >= 0)
  92                 {
  93                         VFrame *buffer = device_buffer(bfr);
  94                         frame->set_timestamp(buffer->get_timestamp());
  95                         frame->allocate_compressed_data(buffer->get_compressed_size());
  96                         frame->set_compressed_size(buffer->get_compressed_size());
  97
  98 // Transfer fields to frame
  99                         if(device->odd_field_first)
 100                         {
 101                                 int field2_offset = mjpeg_get_field2((unsigned char*)buffer->get_data(),
 102                                         buffer->get_compressed_size());
 103                                 int field1_len = field2_offset;
 104                                 int field2_len = buffer->get_compressed_size() -
 105                                         field2_offset;
 106
 107                                 memcpy(frame->get_data(),
 108                                         buffer->get_data() + field2_offset,
 109                                         field2_len);
 110                                 memcpy(frame->get_data() + field2_len,
 111                                         buffer->get_data(),
 112                                         field1_len);
 113                         }
 114                         else
 115                         {
 116                                 bcopy(buffer->get_data(),
 117                                         frame->get_data(),
 118                                         buffer->get_compressed_size());
 119                         }
 120
 121                         put_buffer(bfr);
 122                 }
 123                 else
 124                         result = 1;
 125         }
 126
 127         if( result )
 128                 close_dev();
 129
 130         return result;
 131 }
 132
 133 #endif