Class: Video4Linux2::Camera

Inherits:
Object
  • Object
show all
Defined in:
ext/v4l2/v4l2.c

Defined Under Namespace

Classes: BooleanControl, Control, FormatDescription, FrameCapability, IntegerControl, MenuControl, MenuItem

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(dev) ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 85

static VALUE
rb_camera_initialize(VALUE self, VALUE dev)
{
  int err;
  camera_t* ptr;

  /*
   * argument check
   */
  Check_Type(dev, T_STRING);

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * initialize struct
   */
  err = camera_initialize(ptr, RSTRING_PTR(dev));
  if (err) {
    rb_raise(rb_eRuntimeError, "initialize camera context failed.");
  }

  /*
   * set default instance variable
   */
  rb_ivar_set(self, id_iv_name,
              rb_enc_str_new_cstr(ptr->name, rb_utf8_encoding()));
  rb_ivar_set(self, id_iv_driver,
              rb_enc_str_new_cstr(ptr->driver, rb_utf8_encoding()));
  rb_ivar_set(self, id_iv_bus,
              rb_enc_str_new_cstr(ptr->bus, rb_utf8_encoding()));

  return Qtrue;
}

Class Method Details

.open(device) ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 74

static VALUE
rb_camera_open(VALUE self, VALUE device)
{
  VALUE ret;

  ret = rb_obj_alloc(camera_klass);
  rb_obj_call_init(ret, 1, &device);

  return ret;
}

Instance Method Details

#busy? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'ext/v4l2/v4l2.c', line 895

static VALUE
rb_camera_is_busy(VALUE self)
{
  camera_t* ptr;
  int err;
  int busy;

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * do check
   */
  err = camera_check_busy(ptr, &busy);
  if (err) {
    rb_raise(rb_eRuntimeError, "check failed.");
  }

  return (busy)? Qtrue: Qfalse;
}

#capture ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 861

static VALUE
rb_camera_capture(VALUE self)
{
  VALUE ret;
  camera_t* ptr;
  size_t used;
  int err;

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * allocate return value.
   */
  ret = rb_str_buf_new(ptr->image_size);
  rb_str_set_len(ret, ptr->image_size);

  /*
   * do capture
   */
  err = camera_get_image(ptr, RSTRING_PTR(ret), &used);
  if (err) {
    rb_raise(rb_eRuntimeError, "capture failed.");
  }

  if (ptr->image_size != used) {
    rb_str_set_len(ret, used);
  }

  return ret;
}

#close ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 122

static VALUE
rb_camera_close( VALUE self)
{
  int err;
  camera_t* ptr;

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * convert
   */
  err = camera_finalize(ptr);
  if (err) {
    rb_raise(rb_eRuntimeError, "finalize camera context failed.");
  }

  return Qnil;
}

#controls ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 269

static VALUE
rb_camera_get_controls(VALUE self)
{
  VALUE ret;
  camera_t* ptr;
  int i;
  VALUE info;

  Data_Get_Struct(self, camera_t, ptr);

  ret = rb_ary_new();

  for (i = 0; i < 43; i++) {
    info = get_control_info(ptr, V4L2_CID_BASE + i);
    if (info != Qnil) rb_ary_push(ret, info);
  }

  for (i = 0; i < 30; i++) {
    info = get_control_info(ptr, V4L2_CID_CAMERA_CLASS_BASE + i);
    if (info != Qnil) rb_ary_push(ret, info);
  }

  for (i = 0; i < 20; i++) {
    info = get_control_info(ptr, V4L2_CID_JPEG_CLASS_BASE + i);
    if (info != Qnil) rb_ary_push(ret, info);
  }

  return ret;
}

#error? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'ext/v4l2/v4l2.c', line 918

static VALUE
rb_camera_is_error(VALUE self)
{
  camera_t* ptr;
  int err;
  int error;

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * do check
   */
  err = camera_check_error(ptr, &error);
  if (err) {
    rb_raise(rb_eRuntimeError, "check failed.");
  }

  return (error)? Qtrue: Qfalse;
}

#format=(fmt) ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 589

static VALUE
rb_camera_set_format(VALUE self, VALUE fmt)
{
  camera_t* ptr;
  int err;

  /*
   * argument check
   */
  Check_Type(fmt, T_SYMBOL);

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * set parameter
   */
  err = camera_set_format(ptr, to_pixfmt(fmt));
  if (err) {
    rb_raise(rb_eRuntimeError, "set format failed.");
  }

  return Qnil;
}

#frame_capabilities(_fmt) ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 488

static VALUE
rb_camera_get_frame_capabilities(VALUE self, VALUE _fmt)
{
  VALUE ret;
  camera_t* ptr;
  int i;
  int j;
  uint32_t fmt;

  int err;
  struct v4l2_frmsizeenum size;

  VALUE capa;
  VALUE list;
  VALUE rate;

  Check_Type(_fmt, T_SYMBOL);

  Data_Get_Struct(self, camera_t, ptr);

  ret = rb_ary_new();
  fmt = to_pixfmt(_fmt);

  for (i = 0; ;i++){
    err = camera_get_frame_size(ptr, fmt, i, &size);
    if (err) break;

    if (size.type == V4L2_FRMSIZE_TYPE_DISCRETE) {
      capa = rb_obj_alloc(frame_cap_klass);
      list = get_framerate_list(ptr, fmt, &size.discrete);

      rb_ivar_set(capa, id_iv_width, INT2NUM(size.discrete.width));
      rb_ivar_set(capa, id_iv_height, INT2NUM(size.discrete.height));
      rb_ivar_set(capa, id_iv_rate, list);

      rb_ary_push(ret, capa);

    } else if (size.type == V4L2_FRMSIZE_TYPE_STEPWISE) {
      make_dummy_capabilities(ptr,
                              ret,
                              fmt,
                              size.stepwise.max_width,
                              size.stepwise.max_height);
      break;
    }
  }

  return ret;
}

#framerate ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 716

static VALUE
rb_camera_get_framerate(VALUE self)
{
  return Qnil;
}

#framerate=(val) ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 722

static VALUE
rb_camera_set_framerate(VALUE self, VALUE val)
{
  camera_t* ptr;
  int num;
  int denom;
  int err;

  /*
   * argument check
   */
  switch (TYPE(val)) {
  case T_FIXNUM:
    num   = 1;
    denom = FIX2INT(val);
    break;

  case T_FLOAT:
    num   = 1000;
    denom = (int)(NUM2DBL(val) * 1000.0);
    break;

  case T_RATIONAL:
    num   = FIX2INT(rb_rational_den(val));
    denom = FIX2INT(rb_rational_num(val));
    break;
  
  default:
    rb_raise(rb_eArgError, "illeagal framerate value.");
  }

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * set framerate
   */
  err = camera_set_framerate(ptr, num, denom);
  if (err) {
    rb_raise(rb_eRuntimeError, "set framerate failed.");
  }

  return Qnil;
}

#get_control(id) ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 572

static VALUE
rb_camera_get_control(VALUE self, VALUE id)
{
  camera_t* ptr;
  int err;
  int32_t value;

  Data_Get_Struct( self, camera_t, ptr);

  err = camera_get_control(ptr, FIX2INT(id), &value);
  if (err) {
      rb_raise(rb_eRuntimeError, "get control failed.");
  }

  return INT2FIX(value);
}

#image_height ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 666

static VALUE
rb_camera_get_image_height(VALUE self)
{
  int ret;
  camera_t* ptr;
  int err;

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * get parameter
   */
  err = camera_get_image_height(ptr, &ret);
  if (err) {
    rb_raise(rb_eRuntimeError, "get image height failed.");
  }

  return INT2FIX(ret);
}

#image_height=(val) ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 689

static VALUE
rb_camera_set_image_height(VALUE self, VALUE val)
{
  camera_t* ptr;
  int err;

  /*
   * argument check
   */
  Check_Type(val, T_FIXNUM);

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * set parameter
   */
  err = camera_set_image_height(ptr, FIX2INT(val));
  if (err) {
    rb_raise(rb_eRuntimeError, "set image height failed.");
  }

  return Qnil;
}

#image_width ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 616

static VALUE
rb_camera_get_image_width(VALUE self)
{
  int ret;
  camera_t* ptr;
  int err;

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * get parameter
   */
  err = camera_get_image_width(ptr, &ret);
  if (err) {
    rb_raise(rb_eRuntimeError, "get image width failed.");
  }

  return INT2FIX(ret);
}

#image_width=(val) ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 639

static VALUE
rb_camera_set_image_width(VALUE self, VALUE val)
{
  camera_t* ptr;
  int err;

  /*
   * argument check
   */
  Check_Type(val, T_FIXNUM);

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * set parameter
   */
  err = camera_set_image_width(ptr, FIX2INT(val));
  if (err) {
    rb_raise(rb_eRuntimeError, "set image width failed.");
  }

  return Qnil;
}

#set_control(id, _val) ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 538

static VALUE
rb_camera_set_control(VALUE self, VALUE id, VALUE _val)
{
  camera_t* ptr;
  int err;
  int val;

  Data_Get_Struct(self, camera_t, ptr);

  switch (TYPE(_val)) {
  case T_TRUE:
    val = 1;
    break;

  case T_FALSE:
    val = 0;
    break;

  case T_FIXNUM:
    val = FIX2INT(_val);
    break;

  default:
    rb_raise(rb_eTypeError, "invalid type of control value");
  }

  err = camera_set_control(ptr, FIX2INT(id), val);
  if (err) {
    rb_raise(rb_eRuntimeError, "set control failed.");
  }

  return Qnil;
}

#start ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 816

static VALUE
rb_camera_start(VALUE self)
{
  int err;
  camera_t* ptr;

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * convert
   */
  err = camera_start(ptr);
  if (err) {
    rb_raise(rb_eRuntimeError, "start capture failed.");
  }

  return Qnil;
}

#state ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 769

static VALUE
rb_camera_state( VALUE self)
{
  camera_t* ptr;
  const char* str;

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * convert state code
   */
  switch (ptr->state) {
  case -1:
    str = "ERROR";
    break;

  case 0:
    str = "FINALIZED";
    break;

  case 1:
    str = "INITIALIZED";
    break;

  case 2:
    str = "PREAPARE";
    break;

  case 3:
    str = "READY";
    break;

  case 4:
    str = "ST_REQUESTED";
    break;

  default:
    str = "unknown";
    break;
  }

  return ID2SYM(rb_intern(str));
}

#stop ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 838

static VALUE
rb_camera_stop(VALUE self)
{
  int err;
  camera_t* ptr;

  /*
   * strip object
   */
  Data_Get_Struct(self, camera_t, ptr);

  /*
   * convert
   */
  err = camera_stop(ptr);
  if (err) {
    rb_raise(rb_eRuntimeError, "stop capture failed.");
  }

  return Qnil;
}

#support_formats ⇒ Object 



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# File 'ext/v4l2/v4l2.c', line 385

static VALUE
rb_camera_get_support_formats(VALUE self)
{
  VALUE ret;
  camera_t* ptr;

  int i;
  int err;
  struct v4l2_fmtdesc desc;

  VALUE fmt;
  VALUE fcc;
  VALUE str;

  Data_Get_Struct(self, camera_t, ptr);

  ret = rb_ary_new();

  for (i = 0; ;i++) {
    err = camera_get_format_desc(ptr, i, &desc);
    if (err) break;

    fmt = rb_obj_alloc(fmt_desc_klass);
    fcc = rb_enc_sprintf(rb_utf8_encoding(),
                         "%c%c%c%c",
                         desc.pixelformat >>  0 & 0xff,
                         desc.pixelformat >>  8 & 0xff,
                         desc.pixelformat >> 16 & 0xff,
                         desc.pixelformat >> 24 & 0xff);

    str = rb_enc_str_new_cstr((const char*)desc.description,
                               rb_utf8_encoding());

    rb_ivar_set(fmt, id_iv_fcc, fcc);
    rb_ivar_set(fmt, id_iv_desc, str);
    
    rb_ary_push(ret, fmt);
  }

  return ret;
}