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The hottest downloads on Apple.com. Browse and download thousands of apps for your Mac — from your Mac. Shop for apps by category, read user reviews, and buy apps in one simple step. DirectX.Capture class examples showing how to grab a frame from video and how to make a VU meter for audio. I designed these audio level meter programs to allow the optimum setting of input levels for various sound recording functions, particularly for video editing. When capturing video and sound from different sources accurate. From Rose City Software: DU Meter is a user-friendly tool that enables you to use your Internet connection more efficiently. DU Meter lets you see how much of your full bandwidth potential is actually utilized at any given. The FlashLink ® VU data logger allows for access to temperature history data without having to stop the unit or download the data. DeltaTrak's patented Shadow Log ® feature guarantees temperature history data even if the.
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Direct. Show: Examples for Using Sample. Grabber for Grabbing a Frame and Building a VU Meter.
Direct. X. Capture class examples showing how to grab a frame from video and how to make a VU meter for audio. Introduction. This article is a follow- up of my previous articles: Those articles describe how to do file saving for captured audio and video and to finetune a TV tuner. This article will explain how to use the Sample. Grabber for audio and video.
The first part shows how to grab a frame from a video stream, the second part shows the audio levels by making a VU meter! Grabbing a Frame from a Video Stream. Background. Direct. Show offers two basic methods to grab a frame or an image that is going to be rendered. The first method to grab a frame is the Sample.
Grabber method. Via Sample. Grabber, a frame can be grabbed via a frame event or via Get. Current. Buffer. The second method involves use of Video. Mixing. Renderer or the Basic. Video interface by calling Get.
Current. Image(). This method can be used with VMR or VMR9 for sure, and sometimes this might work for Video Renderer also. The Sample. Grabber code cannot be used if the capture device has a VP (Video Port) pin. Only video cards with a video capture device, such as Nivdia MX4. Vivo video card, will have such a pin. This is not a big concern because either Sample. Grabber can be used via the capture pin or Get.
Current. Image() can be used via the VMR that is connected with the VP pin to render the video. In this example, the Sample.
Grabber method is used to grab a frame via a frame event. This method is used in most examples that are floating around on the Internet. Another advantage is that you have the choice to capture one frame or all frames. Most examples do not show what actions are really needed to get Sample. Grabber working. This example shows what needs to be done. The Code. First, I will give a description of the code changes that should be put in Direct.
X. Capture\Capture. The function Init. Sample. Grabber adds the Sample. Grabber filter to the graph and this function also initializes the media type it should be used for. This function should be called upon rendering Video for preview. Init. Sample. Grabber().
Grabber = new Sample. Grabber() as ISample. Grabber. if(this. Grabber == null). Grab. Flt = (IBase. Filter)this. samp.
Grabber. this. base. Grab. Flt = samp. Grabber as IBase.
Filter. if(this. base. Grab. Flt == null). Marshal. Release.
Com. Object(this. Grabber). this. samp.
Grabber = null. AMMedia. Type media = new AMMedia.
Type(). media. major. Type = Media. Type. Video. media. sub. Type = Media. Sub. Type. RGB2. 4. media. Ptr = Int. Ptr. Zero. Grabber. Set. Media.
Type(media). if(hr < 0). Marshal. Throw. Exception.
For. HR(hr). hr = graph. Builder. Add. Filter(base. Grab. Flt, "Sample. Grabber"). if(hr < 0).
Marshal. Throw. Exception. For. HR(hr). hr = samp.
Grabber. Set. Buffer. Samples(false). if( hr == 0 ). Grabber. Set. One. Shot(false). if( hr == 0 ).
Grabber. Set. Callback(null, 0). Marshal. Throw. Exception.
For. HR(hr). returntrue. It might be possible that the selected media type RGB2.
In such a case, modify the code. The following line of code shows how to get Sample.
Grabber in the graph upon rendering video: #if DSHOWNET. Graph. Builder. Render.
Stream(ref cat, ref med, video. Device. Filter. this. Grab. Flt, this. video.
Renderer. Filter). Graph. Builder. Render. Stream(Ds. Guid. From. Guid(cat). Ds. Guid. From. Guid(med), video.
Device. Filter, this. Grab. Flt. this. video. Renderer. Filter). If Get. Current. Buffer would be used, then Set. Buffer. Samples(true) should be called instead of Set.
Buffer. Samples(false). The function Set. Media. Sample. Grabber retrieves media- specific data and stores that data for later use. This function should be called upon initializing the preview window. Shot. Width = 0. privateint snap.
Shot. Height = 0. Shot. Image. Size = 0.
Shot. Valid = false. Set. Media. Sample. Grabber(). this. snap. Shot. Valid = false. Grab. Flt != null)& & (this.
Allow. Sample. Grabber)). AMMedia. Type media = new AMMedia. Type(). Video. Info. Header video. Info. Header. int hr. hr = samp. Grabber. Get. Connected. Media. Type(media).
Marshal. Throw. Exception. For. HR(hr). if ((media.
Type != Format. Type. Video. Info) || (media. Ptr ==. Int. Ptr. Zero)). Throw new Not. Supported. Exception(. Unknown Grabber Media Format").
Info. Header = (Video. Info. Header)Marshal. Ptr. To. Structure(. Ptr, typeof(Video. Info. Header)). this. Shot. Width = video. Info. Header. Bmi.
Header. Width. this. Shot. Height = video. Info. Header. Bmi.
Header. Height. this. Shot. Image. Size = video. Info. Header. Bmi. Header. Image. Size. Marshal. Free. Co. Task. Mem(media. format. Ptr). media. format.
Ptr = Int. Ptr. Zero. Shot. Valid = true. Shot. Valid). this.
Shot. Width = 0. this. Shot. Height = 0. Shot. Image. Size = 0. Keep in mind that if the media type changes, the number of bytes per pixel (stride) might change as well.
The code for grabbing the frame might look like this: publicdelegatevoid He. Frame(System. Drawing. Bitmap BM). publicevent He. Frame Frame. Event.
Array. privateint buffered. Size. int ISample. Grabber. CB. Buffer.
CB(double Sample. Time, Int. Ptr p. Buffer. int Buffer. Len ). this. buffered.
Size = Buffer. Len. Snap. Shot. Width * 3. Marshal. Copy( p.
Buffer, this. saved. Array, 0, Buffer. Len ). GCHandle handle = GCHandle. Alloc( this. saved. Array, GCHandle. Type.
Pinned ). int scan. Addr. Of. Pinned. Object(). scan. 0 += (this. Snap. Shot. Height - 1) * stride. Bitmap b = new Bitmap(this.
Snap. Shot. Width, this. Snap. Shot. Height, - stride.
System. Drawing. Imaging. Pixel. Format. Format. Rgb, (Int. Ptr) scan. Free(). Set. Bitmap=b. On. Capture. Done(). Trace. Write. Line( "!!
DLG: On. Capture. Done" ). publicvoid Grap. Img(). Trace. Write ("IMG"). Array == null ). int size = this. Shot. Image. Size. Array = newbyte[ size + 6. Grabber. Set. Callback( this, 1 ).
System. Drawing. Bitmap Set. Bitmap. this. Frame. Event. 2(value). }Most examples I saw did not release Sample. Grabber- specific data. This code example should do that job properly.. To get the Sample. Grabber code working, the main program in Capture.
Test\Capture. Test. First, the Capture. Test form needs to get two extra buttons and a Picture. Box. In the code example, I added special code to add a small Picture. Box. You can resize the form as well as resize and reposition the buttons and Picture. Box yourself. I made a very small Picture.
Box on purpose. I also added some code to hide the video file saving buttons and filename when Sample. Grabber is put in the graph. I did this on purpose, as it gave me some free design space on the Capture.
Test form. This also prevents a possible interaction with the video file saving functionality. Click(object sender, System. Event. Args e). this. Frame. Event. 2 += new Capture. He. Frame(this. Capture.
Done). this. capture. Grap. Img(). privatevoid Capture. Done(System. Drawing. Bitmap e). this. picture. Box. 1. Image=e. this. Frame. Event. 2 - = new Capture. He. Frame(this. Capture.
Done). privatevoid button. Click(object sender, System. Event. Args e). if( (this.
Box. 1 != null)& &. Box. 1. Image != null)& &. File. Name. Text.
Length > 0) ). Box. 1. Image. Save(this. File. Name. Text. System. Drawing. Imaging. Image. Format. Bmp). Features are Made Optional.
In the real code example, I added the new features as options. To use a new feature, the corresponding option needs to be selected first.
The main reason for doing this is that a program sometimes failed at first use, due to one of the option settings. Now you can just change the option value and try again. There is one demand: a new value of an option becomes active upon (re)selecting the Audio or Video device. To get the options properly initialized, the function Init. Menu() is added. This function should be called when a capture device is (re)selected.
Menu(). if (this. Allow. Sample. Grabber =. Allow. Sample. Grabber. Checked. this. menu. Sample. Grabber. 1. Enabled =. this. menu. Allow. Sample. Grabber.
Checked. this. menu. Sample. Grabber. 1.
Visible =. this. menu. Allow. Sample. Grabber. Checked. this. capture. Video. Source = this. Video. Source. this. Use. VMR9 = this. Use. VMR9. Checked.
Use. De. Interlace. Checked = this. Find.
Deinterlace. Filter(. Use. De. Interlace. Checked). }Show the Audio Levels via a VU Meter using the Sample. Grabber. Background.
When recording audio, the audio level needs to be set properly. I noticed that sometimes the audio volume was too low and sometimes the audio volume was too strong. The audible audio gives an idea about the volume of the captured audio, but that is not enough. The volume level for audible is usually set to a level the audio sounds great. For recording audio, that is just too vague. There are some interesting code examples published already, such as Analog and LED Meter, LED vu Meter User Control or LED Style Volume Meter using Direct. X. One article shows fantastic looking VU meters, the next one shows a VU meter only and the last one was using Direct.
Sound. These articles taught me how to make and use an User Control. These articles did not teach me how to get and analyze the audio, so that was what I had to figure out. Furthermore I wanted to know the average and peak level of the captured audio.
Direct. Show or capture devices do not have an interface for that, so a filter is needed to analyze the audio and pass the audio levels to the program GUI. The filter could be a DMO filter, unfortunately the DMO output interface is very limited. The filter could be the Sample. Grabber and this was a nice challenge for making a new code example! During testing, I noticed that grabbing audio may affect the audio recording by just small ticks, probably caused by too much CPU time needed for grabbing and showing the audio. Especially the Hauppauge PVR1. This problem sounds a little bit strange because for a video stream is usually far more data involved so there is far more chance of problems.
I think that the higher sample rate for audio is the cause of the problem. For video a frame comes 2.
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