Re: libv4l: Possibility of changing the current pixelformat on the fly
On 04/05/2009 06:53 PM, Theodore Kilgore wrote: On Sun, 5 Apr 2009, Hans de Goede wrote: On 04/05/2009 01:26 PM, Erik Andrén wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hans de Goede wrote: On 04/04/2009 10:22 PM, Erik Andrén wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, While trying to get hflip and vflip working for the stv06xx webcam bridge coupled to the vv6410 sensor I've come across the following problem. When flipping the image horizontally, vertically or both, the sensor pixel ordering changes. In the m5602 driver I was able to compensate for this in the bridge code. In the stv06xx I don't have this option. One way of solving this problem is by changing the pixelformat on the fly, i. e V4L2_PIX_FMT_SGRB8 is the normal format. When a vertical flip is required, change the format to V4L2_SBGGR8. My current understanding of libv4l is that it probes the pixelformat upon device open. In order for this to work we would need either poll the current pixelformat regularly or implement some kind of notification mechanism upon a flipping request. What do you think is this the right way to go or is there another alternative. The changing of the pixelformat only happens when you flip the data before conversion. If you look at the current upside down handling code you will see it does the rotate 180 degrees after conversion. This is how the vflip / hflip should be handled too. We only have 4 (2 really since we don't care about r versus b / u versus v while flippiing) destination formats for which we then need to write flipping code. Otherwise we need to write flipping code for *all* supported input formats, not to mention flipping some input formats is close to impossible (JPEG for example). So you mean we should do the vflip/hflip in software, just exposing one native format? Erm, yes that is what I was saying, but that is because I was confusing things with the sq905 driver some other people are working on. Now I understand what you were trying to ask. So the problem is that the vv6410 sensor can do flipping in hardware, and then the order in which it sends out the pixels changes from gbgbgb (for example) to bgbgbg, for the lines which have blue, effectively changing the pixelformat, right? You mention the sq905 cameras, and the general problem of image flipping. You comment that the order of the data changes if any kind of flipping is done, with the result that the image format (Bayer tiling) changes. One difference I do see here is that the vv6410 sensor can do flipping in hardware which the sq905 cameras obviously can not. However, the fact that the Bayer tiling of the image must change in accordance with the flipping is equally present. And I do not see how that problem could be avoided, on any occasion when flipping is needed. This brings up an interesting question of what would be the most efficient way actually to do the required image flipping: If the flipping is done before the finished image is produced, then the Bayer tiling of the image has changed. Therefore a different treatment is needed. If the flipping is done after the finished image is produced, then there is three times as much data, and the flipping might take longer (or might not if it were done exactly right?). True, still doing the flipping after the conversion is done, is what we are currently doing for the rotate 180 case (so h-flip + v-flip) and is what I think we should also do for the regular h-flip and v-flip. Why? Simplicity! We support 4 different destination formats, which can be simplified to 3 for the flipping case (we do not need to care about uv order). So that means writing vflip + hflip + rotate 180 = 3 x 3 9 flipping routines. At the moment we support 23 different source formats, so doing flipping at the level requires 3 x 23 = 69 flipping routines of which we can shave of quite a bit by being smart here and there, but then we are still left with quite a large number. But the most important reason for me not to want to do this at the source format level, is that I do not want to make it harder to add new source formats. Currently for a new source format, conversion routines for all 4 dest formats must be written, so that is 4 new conversion routines at worst. I do not want to make adding new formats harder. Regards, Hans -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: libv4l: Possibility of changing the current pixelformat on the fly
On 04/04/2009 10:22 PM, Erik Andrén wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, While trying to get hflip and vflip working for the stv06xx webcam bridge coupled to the vv6410 sensor I've come across the following problem. When flipping the image horizontally, vertically or both, the sensor pixel ordering changes. In the m5602 driver I was able to compensate for this in the bridge code. In the stv06xx I don't have this option. One way of solving this problem is by changing the pixelformat on the fly, i. e V4L2_PIX_FMT_SGRB8 is the normal format. When a vertical flip is required, change the format to V4L2_SBGGR8. My current understanding of libv4l is that it probes the pixelformat upon device open. In order for this to work we would need either poll the current pixelformat regularly or implement some kind of notification mechanism upon a flipping request. What do you think is this the right way to go or is there another alternative. The changing of the pixelformat only happens when you flip the data before conversion. If you look at the current upside down handling code you will see it does the rotate 180 degrees after conversion. This is how the vflip / hflip should be handled too. We only have 4 (2 really since we don't care about r versus b / u versus v while flippiing) destination formats for which we then need to write flipping code. Otherwise we need to write flipping code for *all* supported input formats, not to mention flipping some input formats is close to impossible (JPEG for example). Regards, Hans p.s. One problem with this approach is that if an apps ask for a native cam format which is not one which we can also convert to, the flipping won't work. I think this is best solved by simply not listing the native formats in the enum-fmt output when the cam needs flipping. -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: libv4l: Possibility of changing the current pixelformat on the fly
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hans de Goede wrote: On 04/04/2009 10:22 PM, Erik Andrén wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, While trying to get hflip and vflip working for the stv06xx webcam bridge coupled to the vv6410 sensor I've come across the following problem. When flipping the image horizontally, vertically or both, the sensor pixel ordering changes. In the m5602 driver I was able to compensate for this in the bridge code. In the stv06xx I don't have this option. One way of solving this problem is by changing the pixelformat on the fly, i. e V4L2_PIX_FMT_SGRB8 is the normal format. When a vertical flip is required, change the format to V4L2_SBGGR8. My current understanding of libv4l is that it probes the pixelformat upon device open. In order for this to work we would need either poll the current pixelformat regularly or implement some kind of notification mechanism upon a flipping request. What do you think is this the right way to go or is there another alternative. The changing of the pixelformat only happens when you flip the data before conversion. If you look at the current upside down handling code you will see it does the rotate 180 degrees after conversion. This is how the vflip / hflip should be handled too. We only have 4 (2 really since we don't care about r versus b / u versus v while flippiing) destination formats for which we then need to write flipping code. Otherwise we need to write flipping code for *all* supported input formats, not to mention flipping some input formats is close to impossible (JPEG for example). So you mean we should do the vflip/hflip in software, just exposing one native format? Best regards, Erik Regards, Hans p.s. One problem with this approach is that if an apps ask for a native cam format which is not one which we can also convert to, the flipping won't work. I think this is best solved by simply not listing the native formats in the enum-fmt output when the cam needs flipping. -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAknYlVoACgkQN7qBt+4UG0FwqACfQtawSmcm8rtFUCGZtV9pzVd+ jmkAoKHkibnapkZkDfl4pXd8pjaJ9M0E =odkv -END PGP SIGNATURE- -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: libv4l: Possibility of changing the current pixelformat on the fly
On 04/05/2009 01:26 PM, Erik Andrén wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hans de Goede wrote: On 04/04/2009 10:22 PM, Erik Andrén wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, While trying to get hflip and vflip working for the stv06xx webcam bridge coupled to the vv6410 sensor I've come across the following problem. When flipping the image horizontally, vertically or both, the sensor pixel ordering changes. In the m5602 driver I was able to compensate for this in the bridge code. In the stv06xx I don't have this option. One way of solving this problem is by changing the pixelformat on the fly, i. e V4L2_PIX_FMT_SGRB8 is the normal format. When a vertical flip is required, change the format to V4L2_SBGGR8. My current understanding of libv4l is that it probes the pixelformat upon device open. In order for this to work we would need either poll the current pixelformat regularly or implement some kind of notification mechanism upon a flipping request. What do you think is this the right way to go or is there another alternative. The changing of the pixelformat only happens when you flip the data before conversion. If you look at the current upside down handling code you will see it does the rotate 180 degrees after conversion. This is how the vflip / hflip should be handled too. We only have 4 (2 really since we don't care about r versus b / u versus v while flippiing) destination formats for which we then need to write flipping code. Otherwise we need to write flipping code for *all* supported input formats, not to mention flipping some input formats is close to impossible (JPEG for example). So you mean we should do the vflip/hflip in software, just exposing one native format? Erm, yes that is what I was saying, but that is because I was confusing things with the sq905 driver some other people are working on. Now I understand what you were trying to ask. So the problem is that the vv6410 sensor can do flipping in hardware, and then the order in which it sends out the pixels changes from gbgbgb (for example) to bgbgbg, for the lines which have blue, effectively changing the pixelformat, right? In that case I think the only solution is to simply return -EBUSY when the vflip / hflip controls are changed while a stream is active. As for the race window with one application querying the format (or even setting it) and then another app changing the flip before the application which just set the format starts the stream, we already have that wrt 2 applications doing this: app a: setformat x app b: setformat y app a: start stream (thinking format is x) Which is something which normally (luckily) never happens. Does that sound like a plan ? Note that this is a solution at the driver level, which IMHO is the only way as we cannot assume libv4l is always being used. Regards, Hans -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: libv4l: Possibility of changing the current pixelformat on the fly
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hans de Goede wrote: On 04/05/2009 01:26 PM, Erik Andrén wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hans de Goede wrote: On 04/04/2009 10:22 PM, Erik Andrén wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, While trying to get hflip and vflip working for the stv06xx webcam bridge coupled to the vv6410 sensor I've come across the following problem. When flipping the image horizontally, vertically or both, the sensor pixel ordering changes. In the m5602 driver I was able to compensate for this in the bridge code. In the stv06xx I don't have this option. One way of solving this problem is by changing the pixelformat on the fly, i. e V4L2_PIX_FMT_SGRB8 is the normal format. When a vertical flip is required, change the format to V4L2_SBGGR8. My current understanding of libv4l is that it probes the pixelformat upon device open. In order for this to work we would need either poll the current pixelformat regularly or implement some kind of notification mechanism upon a flipping request. What do you think is this the right way to go or is there another alternative. The changing of the pixelformat only happens when you flip the data before conversion. If you look at the current upside down handling code you will see it does the rotate 180 degrees after conversion. This is how the vflip / hflip should be handled too. We only have 4 (2 really since we don't care about r versus b / u versus v while flippiing) destination formats for which we then need to write flipping code. Otherwise we need to write flipping code for *all* supported input formats, not to mention flipping some input formats is close to impossible (JPEG for example). So you mean we should do the vflip/hflip in software, just exposing one native format? Erm, yes that is what I was saying, but that is because I was confusing things with the sq905 driver some other people are working on. Glad that you were confused as I couldn't really make out the meaning of your answer. :) Now I understand what you were trying to ask. So the problem is that the vv6410 sensor can do flipping in hardware, and then the order in which it sends out the pixels changes from gbgbgb (for example) to bgbgbg, for the lines which have blue, effectively changing the pixelformat, right? Correct. In that case I think the only solution is to simply return -EBUSY when the vflip / hflip controls are changed while a stream is active. So this effectively forces a reprobe of the hardware? As for the race window with one application querying the format (or even setting it) and then another app changing the flip before the application which just set the format starts the stream, we already have that wrt 2 applications doing this: app a: setformat x app b: setformat y app a: start stream (thinking format is x) Which is something which normally (luckily) never happens. If this ever becomes a real issue, shouldn't some kind of user-space master program aquire the device and then handle format requests for all client programs? Does that sound like a plan ? Yes, I'll try this ASAP. Note that this is a solution at the driver level, which IMHO is the only way as we cannot assume libv4l is always being used. If it works this sounds like the most clean and elegant solution. The weak point being that the application must try to renegotiate the format upon the -EBUSY signal. Thanks for the help! Regards, Erik Regards, Hans -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAknYqtwACgkQN7qBt+4UG0FBgACggwgmVfMKj2bQAj/UVSL/vHSH Ss0Anj/8xoRpXiIzBg3HdtDa0SXK6WK2 =yIxz -END PGP SIGNATURE- -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: libv4l: Possibility of changing the current pixelformat on the fly
On 04/05/2009 02:58 PM, Erik Andrén wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hans de Goede wrote: On 04/05/2009 01:26 PM, Erik Andrén wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hans de Goede wrote: On 04/04/2009 10:22 PM, Erik Andrén wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, While trying to get hflip and vflip working for the stv06xx webcam bridge coupled to the vv6410 sensor I've come across the following problem. When flipping the image horizontally, vertically or both, the sensor pixel ordering changes. In the m5602 driver I was able to compensate for this in the bridge code. In the stv06xx I don't have this option. One way of solving this problem is by changing the pixelformat on the fly, i. e V4L2_PIX_FMT_SGRB8 is the normal format. When a vertical flip is required, change the format to V4L2_SBGGR8. My current understanding of libv4l is that it probes the pixelformat upon device open. In order for this to work we would need either poll the current pixelformat regularly or implement some kind of notification mechanism upon a flipping request. What do you think is this the right way to go or is there another alternative. The changing of the pixelformat only happens when you flip the data before conversion. If you look at the current upside down handling code you will see it does the rotate 180 degrees after conversion. This is how the vflip / hflip should be handled too. We only have 4 (2 really since we don't care about r versus b / u versus v while flippiing) destination formats for which we then need to write flipping code. Otherwise we need to write flipping code for *all* supported input formats, not to mention flipping some input formats is close to impossible (JPEG for example). So you mean we should do the vflip/hflip in software, just exposing one native format? Erm, yes that is what I was saying, but that is because I was confusing things with the sq905 driver some other people are working on. Glad that you were confused as I couldn't really make out the meaning of your answer. :) Now I understand what you were trying to ask. So the problem is that the vv6410 sensor can do flipping in hardware, and then the order in which it sends out the pixels changes from gbgbgb (for example) to bgbgbg, for the lines which have blue, effectively changing the pixelformat, right? Correct. In that case I think the only solution is to simply return -EBUSY when the vflip / hflip controls are changed while a stream is active. So this effectively forces a reprobe of the hardware? No, it just disallows changing the flipping (and thus the format) while an app is actively streaming. so one can use something like v4l2ucp, and change the flipping while the cam is not being used otherwise, but if for example skype or cheese or whatever is streaming data from the cam then the flip will be disallowed (and a device busy error will be returned). This may not seem very user friendly but normally one does not want to mess with the flip controls anyways unless the cam is mounted upside down or something like that. As for the race window with one application querying the format (or even setting it) and then another app changing the flip before the application which just set the format starts the stream, we already have that wrt 2 applications doing this: app a: setformat x app b: setformat y app a: start stream (thinking format is x) Which is something which normally (luckily) never happens. If this ever becomes a real issue, shouldn't some kind of user-space master program aquire the device and then handle format requests for all client programs? Yes, one of these days we need to think (very hard) about a much better way for sharing v4l devices. Does that sound like a plan ? Yes, I'll try this ASAP. Note that this is a solution at the driver level, which IMHO is the only way as we cannot assume libv4l is always being used. If it works this sounds like the most clean and elegant solution. The weak point being that the application must try to renegotiate the format upon the -EBUSY signal. No, the idea is that the flipping will simply not change (hence the error, signaling the setting of the flip control failed). Regards, Hans -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: libv4l: Possibility of changing the current pixelformat on the fly
On Sun, 5 Apr 2009, Hans de Goede wrote: On 04/05/2009 01:26 PM, Erik Andrén wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hans de Goede wrote: On 04/04/2009 10:22 PM, Erik Andrén wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, While trying to get hflip and vflip working for the stv06xx webcam bridge coupled to the vv6410 sensor I've come across the following problem. When flipping the image horizontally, vertically or both, the sensor pixel ordering changes. In the m5602 driver I was able to compensate for this in the bridge code. In the stv06xx I don't have this option. One way of solving this problem is by changing the pixelformat on the fly, i. e V4L2_PIX_FMT_SGRB8 is the normal format. When a vertical flip is required, change the format to V4L2_SBGGR8. My current understanding of libv4l is that it probes the pixelformat upon device open. In order for this to work we would need either poll the current pixelformat regularly or implement some kind of notification mechanism upon a flipping request. What do you think is this the right way to go or is there another alternative. The changing of the pixelformat only happens when you flip the data before conversion. If you look at the current upside down handling code you will see it does the rotate 180 degrees after conversion. This is how the vflip / hflip should be handled too. We only have 4 (2 really since we don't care about r versus b / u versus v while flippiing) destination formats for which we then need to write flipping code. Otherwise we need to write flipping code for *all* supported input formats, not to mention flipping some input formats is close to impossible (JPEG for example). So you mean we should do the vflip/hflip in software, just exposing one native format? Erm, yes that is what I was saying, but that is because I was confusing things with the sq905 driver some other people are working on. Now I understand what you were trying to ask. So the problem is that the vv6410 sensor can do flipping in hardware, and then the order in which it sends out the pixels changes from gbgbgb (for example) to bgbgbg, for the lines which have blue, effectively changing the pixelformat, right? You mention the sq905 cameras, and the general problem of image flipping. You comment that the order of the data changes if any kind of flipping is done, with the result that the image format (Bayer tiling) changes. One difference I do see here is that the vv6410 sensor can do flipping in hardware which the sq905 cameras obviously can not. However, the fact that the Bayer tiling of the image must change in accordance with the flipping is equally present. And I do not see how that problem could be avoided, on any occasion when flipping is needed. This brings up an interesting question of what would be the most efficient way actually to do the required image flipping: If the flipping is done before the finished image is produced, then the Bayer tiling of the image has changed. Therefore a different treatment is needed. If the flipping is done after the finished image is produced, then there is three times as much data, and the flipping might take longer (or might not if it were done exactly right?). Therefore, how best to do this? As I said, I am thinking about the sq905 driver. One of its peculiarities, as far as I can tell, is that the cameras all use the same Bayer tiling before the flipping. But after the flipping it is obviously a different story. The approach that was taken in the libgphoto2 driver for the sq905 cameras was to do the flipping first, and then to apply the right Bayer tiling afterward for the particular camera. Clearly, that could also be done here. However, is that the best way to go about it? Perhaps in fact it is simpler to do the flipping of an entire finished image, instead. Then one would of course have to move triples instead of single bytes, in order to leave the color mapping unmolested. It is interesting that this problem comes up with some other cameras, too. Theodore Kilgore
Re: libv4l: Possibility of changing the current pixelformat on the fly
On Sun, 5 Apr 2009, Jean-Francois Moine wrote: On Sat, 04 Apr 2009 22:22:19 +0200 Erik Andrén erik.and...@gmail.com wrote: [snip] When flipping the image horizontally, vertically or both, the sensor pixel ordering changes. In the m5602 driver I was able to compensate for this in the bridge code. In the stv06xx I don't have this option. One way of solving this problem is by changing the pixelformat on the fly, i. e V4L2_PIX_FMT_SGRB8 is the normal format. When a vertical flip is required, change the format to V4L2_SBGGR8. My current understanding of libv4l is that it probes the pixelformat upon device open. In order for this to work we would need either poll the current pixelformat regularly or implement some kind of notification mechanism upon a flipping request. What do you think is this the right way to go or is there another alternative. Hi Erik, I saw such a problem in some other webcams. When doing a flip, the sensor scans the pixels in the reverse order. So, R G R G G B G B becomes B G B G G R G R The solution is to start the scan one line lower or higher for VFLIP and one pixel on the left or on the right for HFLIP. May you do this with all the sensors of the stv06xx? That is a very clever solution -- if the hardware will do such a thing. I can not speak for the stv06xx cameras, of course. But I am pretty sure it is impossible for the sq905 cameras. Therefore it is not a universal solution. If it can be done, great. But it seems to me that the general way to do this would be just to adjust the Bayer tiling to be in accord with the flipping after it is done (one of the possibilities already mentioned above). The problem which I would address is that the need for image flipping ought to be handled in a standard way, if possible. The sq905 cameras (with which I have been directly concerned) do give rise to similar problems. The big difference is that there is no way with an sq905 to tell the camera to do any flipping in hardware, nor to shift the pixel reading one space over or down. Hence my obvious interest in seeing this problem analysed completely, and in seeing the best solution adopted. One possible way to do that would be to have the choice for the pixel format to reflect what it ought to be, after any flipping has taken place. From this point of view, it would not matter if the flipping is done in V4L or in hardware, before the data has left the camera. It would only be necessary to agree that any required flipping takes place first, and then the Bayer interpolation afterwards. Theodore Kilgore
Re: libv4l: Possibility of changing the current pixelformat on the fly
2009/4/5 Jean-Francois Moine moin...@free.fr: On Sat, 04 Apr 2009 22:22:19 +0200 Erik Andrén erik.and...@gmail.com wrote: [snip] When flipping the image horizontally, vertically or both, the sensor pixel ordering changes. In the m5602 driver I was able to compensate for this in the bridge code. In the stv06xx I don't have this option. One way of solving this problem is by changing the pixelformat on the fly, i. e V4L2_PIX_FMT_SGRB8 is the normal format. When a vertical flip is required, change the format to V4L2_SBGGR8. My current understanding of libv4l is that it probes the pixelformat upon device open. In order for this to work we would need either poll the current pixelformat regularly or implement some kind of notification mechanism upon a flipping request. What do you think is this the right way to go or is there another alternative. Hi Erik, I saw such a problem in some other webcams. When doing a flip, the sensor scans the pixels in the reverse order. So, R G R G G B G B becomes B G B G G R G R The solution is to start the scan one line lower or higher for VFLIP and one pixel on the left or on the right for HFLIP. As I wrote in my original email I haven't found out a way to adjust this when using the vv6410 sensor. May you do this with all the sensors of the stv06xx? This issue is vv6410 specific. Best regards, Erik Andrén Cheers. -- Ken ar c'hentan | ** Breizh ha Linux atav! ** Jef | http://moinejf.free.fr/ -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
libv4l: Possibility of changing the current pixelformat on the fly
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, While trying to get hflip and vflip working for the stv06xx webcam bridge coupled to the vv6410 sensor I've come across the following problem. When flipping the image horizontally, vertically or both, the sensor pixel ordering changes. In the m5602 driver I was able to compensate for this in the bridge code. In the stv06xx I don't have this option. One way of solving this problem is by changing the pixelformat on the fly, i. e V4L2_PIX_FMT_SGRB8 is the normal format. When a vertical flip is required, change the format to V4L2_SBGGR8. My current understanding of libv4l is that it probes the pixelformat upon device open. In order for this to work we would need either poll the current pixelformat regularly or implement some kind of notification mechanism upon a flipping request. What do you think is this the right way to go or is there another alternative. Best regards, Erik -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAknXwXcACgkQN7qBt+4UG0GVfwCfQjWjSu2fdyrgl3BRGlum3cJi aFAAoKBrKtTezxcnAbmmvM1cLpYOWvvf =4D37 -END PGP SIGNATURE- -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
