RE: Zooming with V4L2

2010-11-24 Thread Shuzhen Wang
3:05 PM To: Shuzhen Wang Cc: linux-media@vger.kernel.org; 'Hans de Goede' Subject: Re: Zooming with V4L2 Hi Shuzhen, On Wednesday 24 November 2010 20:58:33 Shuzhen Wang wrote: > Hello, Laurent, > > About using daemon, we have proprietary image processing and optimization

Re: Zooming with V4L2

2010-11-24 Thread Laurent Pinchart
Hi Shuzhen, On Wednesday 24 November 2010 20:58:33 Shuzhen Wang wrote: > Hello, Laurent, > > About using daemon, we have proprietary image processing and optimization > code that needs to sit between application and driver. That's a pretty common requirement, and there's nothing seriously wrong

RE: Zooming with V4L2

2010-11-24 Thread Shuzhen Wang
http://www.linuxtv.org/news.php?entry=2010-06-22.mchehab. Regards, Shuzhen -Original Message- From: Laurent Pinchart [mailto:laurent.pinch...@ideasonboard.com] Sent: Wednesday, November 24, 2010 4:02 AM To: Shuzhen Wang Cc: linux-media@vger.kernel.org; 'Hans de Goede' Subject: Re: Zoomin

Re: Zooming with V4L2

2010-11-24 Thread Laurent Pinchart
Hi Shuzhen, On Monday 22 November 2010 23:51:41 Shuzhen Wang wrote: > Hello, Laurent, > > I Get the logic you have behind using cropping/scaling. > > The reason I wanted to use V4L2_CID_ZOOM_ABSOLUTE are that the application > will have a simpler interface to control zoom level supported by the

RE: Zooming with V4L2

2010-11-22 Thread Shuzhen Wang
ang; linux-media@vger.kernel.org Subject: Re: Zooming with V4L2 On Monday 22 November 2010 12:34:04 Laurent Pinchart wrote: > On Monday 22 November 2010 12:23:49 Hans de Goede wrote: > > On 11/22/2010 11:59 AM, Laurent Pinchart wrote: > > > On Sunday 21 November 2010 00:50:59 Shuz

Re: Zooming with V4L2

2010-11-22 Thread Sylwester Nawrocki
Hello, On 11/22/2010 12:53 PM, Hans Verkuil wrote: > On Monday, November 22, 2010 12:34:50 Laurent Pinchart wrote: >> On Monday 22 November 2010 12:34:04 Laurent Pinchart wrote: >>> On Monday 22 November 2010 12:23:49 Hans de Goede wrote: On 11/22/2010 11:59 AM, Laurent Pinchart wrote: >

Re: Zooming with V4L2

2010-11-22 Thread Hans Verkuil
On Monday, November 22, 2010 12:34:50 Laurent Pinchart wrote: > On Monday 22 November 2010 12:34:04 Laurent Pinchart wrote: > > On Monday 22 November 2010 12:23:49 Hans de Goede wrote: > > > On 11/22/2010 11:59 AM, Laurent Pinchart wrote: > > > > On Sunday 21 November 2010 00:50:59 Shuzhen Wang wro

Re: Zooming with V4L2

2010-11-22 Thread Laurent Pinchart
On Monday 22 November 2010 12:34:04 Laurent Pinchart wrote: > On Monday 22 November 2010 12:23:49 Hans de Goede wrote: > > On 11/22/2010 11:59 AM, Laurent Pinchart wrote: > > > On Sunday 21 November 2010 00:50:59 Shuzhen Wang wrote: > > >> Hello, Laurent, > > >> > > >> Thank you for the reply. > >

Re: Zooming with V4L2

2010-11-22 Thread Laurent Pinchart
Hi Hans, On Monday 22 November 2010 12:23:49 Hans de Goede wrote: > On 11/22/2010 11:59 AM, Laurent Pinchart wrote: > > On Sunday 21 November 2010 00:50:59 Shuzhen Wang wrote: > >> Hello, Laurent, > >> > >> Thank you for the reply. > >> > >> In our case, most of the time the sensor outputs bigge

Re: Zooming with V4L2

2010-11-22 Thread Hans de Goede
Hi, On 11/22/2010 11:59 AM, Laurent Pinchart wrote: Hi Shuzhen, On Sunday 21 November 2010 00:50:59 Shuzhen Wang wrote: Hello, Laurent, Thank you for the reply. In our case, most of the time the sensor outputs bigger image size than the output size, so the ISP hardware does downscaling. When

Re: Zooming with V4L2

2010-11-22 Thread Laurent Pinchart
Hi Shuzhen, On Sunday 21 November 2010 00:50:59 Shuzhen Wang wrote: > Hello, Laurent, > > Thank you for the reply. > > In our case, most of the time the sensor outputs bigger image size than the > output size, so the ISP hardware does downscaling. > When zooming in, we can do cropping, and less

RE: Zooming with V4L2

2010-11-20 Thread Shuzhen Wang
asonboard.com] Sent: Saturday, November 20, 2010 9:37 AM To: Shuzhen Wang Cc: linux-media@vger.kernel.org Subject: Re: Zooming with V4L2 Hi Shuzhen, On Saturday 20 November 2010 00:17:23 Shuzhen Wang wrote: > Hello, > > I am working on a SOC V4L2 driver, and need to implement zo

Re: Zooming with V4L2

2010-11-20 Thread Laurent Pinchart
Hi Shuzhen, On Saturday 20 November 2010 00:17:23 Shuzhen Wang wrote: > Hello, > > I am working on a SOC V4L2 driver, and need to implement zoom > functionality. > > From application, there are 2 ways to do zooming. The 1st way is to use > cropping and scaling as described in section 1.11.1. The

Zooming with V4L2

2010-11-19 Thread Shuzhen Wang
Hello, I am working on a SOC V4L2 video driver, and need to implement zoom functionality. >From application, there are 2 ways to do zooming. The 1st way is to use cropping and scaling as described in section 1.11.1. The application calls VIDIOC_S_CROP to achieve zoom. The 2nd way is to use V4L2