int InitVideo (access_t *access, int fd, uint32_t caps)
{
access_sys_t *sys = access->p_sys;
if (!(caps & V4L2_CAP_VIDEO_CAPTURE))
{
msg_Err (access, "not a video capture device");
return -1;
}
v4l2_std_id std;
if (SetupInput (VLC_OBJECT(access), fd, &std))
return -1;
/* NOTE: The V4L access_demux expects a VLC FOURCC as "chroma". It is used to set the
* es_format_t structure correctly. However, the V4L access (*here*) has no use for a
* VLC FOURCC and expects a V4L2 format directly instead. That is confusing :-( */
uint32_t pixfmt = 0;
char *fmtstr = var_InheritString (access, CFG_PREFIX"chroma");
if (fmtstr != NULL && strlen (fmtstr) <= 4)
{
memcpy (&pixfmt, fmtstr, strlen (fmtstr));
free (fmtstr);
}
else
/* Use the default^Wprevious format if none specified */
{
struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
if (v4l2_ioctl (fd, VIDIOC_G_FMT, &fmt) < 0)
{
msg_Err (access, "cannot get default format: %s",
vlc_strerror_c(errno));
return -1;
}
pixfmt = fmt.fmt.pix.pixelformat;
}
msg_Dbg (access, "selected format %4.4s", (const char *)&pixfmt);
struct v4l2_format fmt;
struct v4l2_streamparm parm;
if (SetupFormat (access, fd, pixfmt, &fmt, &parm))
return -1;
msg_Dbg (access, "%"PRIu32" bytes for complete image", fmt.fmt.pix.sizeimage);
/* Check interlacing */
switch (fmt.fmt.pix.field)
{
case V4L2_FIELD_INTERLACED:
msg_Dbg (access, "Interlacing setting: interleaved");
/*if (NTSC)
sys->block_flags = BLOCK_FLAG_BOTTOM_FIELD_FIRST;
else*/
sys->block_flags = BLOCK_FLAG_TOP_FIELD_FIRST;
break;
case V4L2_FIELD_INTERLACED_TB:
msg_Dbg (access, "Interlacing setting: interleaved top bottom" );
sys->block_flags = BLOCK_FLAG_TOP_FIELD_FIRST;
break;
case V4L2_FIELD_INTERLACED_BT:
msg_Dbg (access, "Interlacing setting: interleaved bottom top" );
sys->block_flags = BLOCK_FLAG_BOTTOM_FIELD_FIRST;
break;
default:
break;
}
/* Init I/O method */
if (caps & V4L2_CAP_STREAMING)
{
sys->bufc = 4;
sys->bufv = StartMmap (VLC_OBJECT(access), fd, &sys->bufc);
if (sys->bufv == NULL)
return -1;
access->pf_block = MMapBlock;
}
else if (caps & V4L2_CAP_READWRITE)
{
sys->blocksize = fmt.fmt.pix.sizeimage;
sys->bufv = NULL;
access->pf_block = ReadBlock;
}
else
{
msg_Err (access, "no supported capture method");
return -1;
}
return 0;
}
int InitVideo (access_t *access, int fd, uint32_t caps)
{
access_sys_t *sys = access->p_sys;
if (!(caps & V4L2_CAP_VIDEO_CAPTURE))
{
msg_Err (access, "not a video capture device");
return -1;
}
if (SetupInput (VLC_OBJECT(access), fd))
return -1;
sys->controls = ControlsInit (VLC_OBJECT(access), fd);
/* Try and find default resolution if not specified */
struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
if (v4l2_ioctl (fd, VIDIOC_G_FMT, &fmt) < 0)
{
msg_Err (access, "cannot get default format: %m");
return -1;
}
/* Print extra info */
msg_Dbg (access, "%d bytes maximum for complete image",
fmt.fmt.pix.sizeimage );
/* Check interlacing */
switch (fmt.fmt.pix.field)
{
case V4L2_FIELD_INTERLACED:
msg_Dbg (access, "Interlacing setting: interleaved");
/*if (NTSC)
sys->block_flags = BLOCK_FLAG_BOTTOM_FIELD_FIRST;
else*/
sys->block_flags = BLOCK_FLAG_TOP_FIELD_FIRST;
break;
case V4L2_FIELD_INTERLACED_TB:
msg_Dbg (access, "Interlacing setting: interleaved top bottom" );
sys->block_flags = BLOCK_FLAG_TOP_FIELD_FIRST;
break;
case V4L2_FIELD_INTERLACED_BT:
msg_Dbg (access, "Interlacing setting: interleaved bottom top" );
sys->block_flags = BLOCK_FLAG_BOTTOM_FIELD_FIRST;
break;
default:
break;
}
/* Init I/O method */
if (caps & V4L2_CAP_STREAMING)
{
sys->bufc = 4;
sys->bufv = StartMmap (VLC_OBJECT(access), fd, &sys->bufc);
if (sys->bufv == NULL)
return -1;
access->pf_block = AccessRead;
}
else if (caps & V4L2_CAP_READWRITE)
{
sys->blocksize = fmt.fmt.pix.sizeimage;
sys->bufv = NULL;
access->pf_read = AccessReadStream;
}
else
{
msg_Err (access, "no supported I/O method");
return -1;
}
return 0;
}
