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12 <concept xml:lang="en" id="GUID-5F4510C9-5B16-593A-A225-37606800915B"><title>Controlling Video Playback</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>This tutorial describes how to control video playback. </p> <section><title>Purpose</title> <p>The purpose of this tutorial is to show you how to use the video player to control video playback. </p> <p><b>Required Background</b> </p> <p>The <xref href="GUID-2DC80BA9-7AA2-5CD3-9105-1DE28CE196C1.dita">Video Client Overview</xref> introduces the video client utilities. </p> <p><b>Introduction</b> </p> <p>The video player utility is used to open, play, and obtain information from sampled video data. This functionality is implemented by the <xref href="GUID-0F1F8AC6-B99F-3274-A785-9977197AF762.dita"><apiname>CVideoPlayerUtility</apiname></xref> class. The video data can be supplied either in a file, a descriptor or a URL. </p> <p>The sequence diagram below explains the different functionalities of the Video Player Utility: </p> <fig id="GUID-2EA17DB0-6634-5E49-BB86-01C42C1135FC"><title> |
12 <concept xml:lang="en" id="GUID-5F4510C9-5B16-593A-A225-37606800915B"><title>Controlling Video Playback</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>This tutorial describes how to control video playback. </p> <section><title>Purpose</title> <p>The purpose of this tutorial is to show you how to use the video player to control video playback. </p> <p><b>Required Background</b> </p> <p>The <xref href="GUID-2DC80BA9-7AA2-5CD3-9105-1DE28CE196C1.dita">Video Client Overview</xref> introduces the video client utilities. </p> <p><b>Introduction</b> </p> <p>The video player utility is used to open, play, and obtain information from sampled video data. This functionality is implemented by the <xref href="GUID-0F1F8AC6-B99F-3274-A785-9977197AF762.dita"><apiname>CVideoPlayerUtility</apiname></xref> class. The video data can be supplied either in a file, a descriptor or a URL. </p> <p>The sequence diagram below explains the different functionalities of the Video Player Utility: </p> <fig id="GUID-2EA17DB0-6634-5E49-BB86-01C42C1135FC"><title> |
13 Video Player sequence diagram |
13 Video Player sequence diagram |
14 </title> <image href="GUID-821FEEDD-81B8-5511-AC4E-B673A96F8CB4_d0e318618_href.png" placement="inline"/></fig> </section> <section><title>Using Video Player </title> <p>The following tasks will be covered in this tutorial: </p> <ul><li id="GUID-CAF49972-CFDE-5061-9218-31E38BC81B6D"><p><xref href="GUID-5F4510C9-5B16-593A-A225-37606800915B.dita#GUID-5F4510C9-5B16-593A-A225-37606800915B/GUID-B8EAAD02-FBDF-5C9D-B29E-0256FE85BEFC">Play Video Clips</xref> </p> </li> <li id="GUID-6BAF2C1B-8A15-57D3-9DC0-A29A640AFFBF"><p><xref href="GUID-5F4510C9-5B16-593A-A225-37606800915B.dita#GUID-5F4510C9-5B16-593A-A225-37606800915B/GUID-FD4809DF-3F92-528D-856E-40E1F468B44E">Get Current Frame</xref> </p> </li> </ul> <p id="GUID-B8EAAD02-FBDF-5C9D-B29E-0256FE85BEFC"><b>Playing Video Clips</b> </p> <p>The high level steps to play video clips are shown here: </p> <ol id="GUID-7B98B85D-2B14-5613-9B12-B804B64F9AC6"><li id="GUID-101DA10D-4871-596C-9B70-F5A7465AA466"><p>After configuring the properties, the <xref href="GUID-0F1F8AC6-B99F-3274-A785-9977197AF762.dita#GUID-0F1F8AC6-B99F-3274-A785-9977197AF762/GUID-A9DCC4EB-B4B3-3AF4-B78C-DC3531A32DCC"><apiname>CVideoPlayerUtility::Play()</apiname></xref> function is called for the video clip to be played. </p> </li> <li id="GUID-99101893-33E0-5C2D-981C-FEF63EC19126"><p>The play can be paused for a small duration using <xref href="GUID-0F1F8AC6-B99F-3274-A785-9977197AF762.dita#GUID-0F1F8AC6-B99F-3274-A785-9977197AF762/GUID-CCF5BF0E-BD93-34AC-812E-443ECD07FE26"><apiname>CVideoPlayerUtility::PauseL()</apiname></xref> and later resumed by calling <xref href="GUID-0F1F8AC6-B99F-3274-A785-9977197AF762.dita#GUID-0F1F8AC6-B99F-3274-A785-9977197AF762/GUID-A9DCC4EB-B4B3-3AF4-B78C-DC3531A32DCC"><apiname>CVideoPlayerUtility::Play()</apiname></xref> function once again. </p> </li> <li id="GUID-25191728-63D1-5479-8B60-3B047E9FAD80"><p>To halt the video play <xref href="GUID-0F1F8AC6-B99F-3274-A785-9977197AF762.dita#GUID-0F1F8AC6-B99F-3274-A785-9977197AF762/GUID-C103A911-AF93-3350-B731-C186A279F1DC"><apiname>CVideoPlayerUtility::Stop()</apiname></xref> is called. </p> </li> <li id="GUID-950B9AA4-E72B-5FCD-91EB-623A98E290E2"><p>In order to unload all related controllers and return, use <xref href="GUID-0F1F8AC6-B99F-3274-A785-9977197AF762.dita#GUID-0F1F8AC6-B99F-3274-A785-9977197AF762/GUID-C30FFC28-BA6E-3467-9DE7-EE0FF6202E26"><apiname>CVideoPlayerUtility::Close()</apiname></xref>. </p> </li> </ol> <p>These high level steps are shown in the following example code: </p> <codeblock id="GUID-6CC6023A-FBFF-549B-BE29-16AF112D2BB3" xml:space="preserve">void CPlayVideo::Play() //Starts playback of the video clip |
14 </title> <image href="GUID-821FEEDD-81B8-5511-AC4E-B673A96F8CB4_d0e312224_href.png" placement="inline"/></fig> </section> <section><title>Using Video Player </title> <p>The following tasks will be covered in this tutorial: </p> <ul><li id="GUID-CAF49972-CFDE-5061-9218-31E38BC81B6D"><p><xref href="GUID-5F4510C9-5B16-593A-A225-37606800915B.dita#GUID-5F4510C9-5B16-593A-A225-37606800915B/GUID-B8EAAD02-FBDF-5C9D-B29E-0256FE85BEFC">Play Video Clips</xref> </p> </li> <li id="GUID-6BAF2C1B-8A15-57D3-9DC0-A29A640AFFBF"><p><xref href="GUID-5F4510C9-5B16-593A-A225-37606800915B.dita#GUID-5F4510C9-5B16-593A-A225-37606800915B/GUID-FD4809DF-3F92-528D-856E-40E1F468B44E">Get Current Frame</xref> </p> </li> </ul> <p id="GUID-B8EAAD02-FBDF-5C9D-B29E-0256FE85BEFC"><b>Playing Video Clips</b> </p> <p>The high level steps to play video clips are shown here: </p> <ol id="GUID-7B98B85D-2B14-5613-9B12-B804B64F9AC6"><li id="GUID-101DA10D-4871-596C-9B70-F5A7465AA466"><p>After configuring the properties, the <xref href="GUID-0F1F8AC6-B99F-3274-A785-9977197AF762.dita#GUID-0F1F8AC6-B99F-3274-A785-9977197AF762/GUID-A9DCC4EB-B4B3-3AF4-B78C-DC3531A32DCC"><apiname>CVideoPlayerUtility::Play()</apiname></xref> function is called for the video clip to be played. </p> </li> <li id="GUID-99101893-33E0-5C2D-981C-FEF63EC19126"><p>The play can be paused for a small duration using <xref href="GUID-0F1F8AC6-B99F-3274-A785-9977197AF762.dita#GUID-0F1F8AC6-B99F-3274-A785-9977197AF762/GUID-CCF5BF0E-BD93-34AC-812E-443ECD07FE26"><apiname>CVideoPlayerUtility::PauseL()</apiname></xref> and later resumed by calling <xref href="GUID-0F1F8AC6-B99F-3274-A785-9977197AF762.dita#GUID-0F1F8AC6-B99F-3274-A785-9977197AF762/GUID-A9DCC4EB-B4B3-3AF4-B78C-DC3531A32DCC"><apiname>CVideoPlayerUtility::Play()</apiname></xref> function once again. </p> </li> <li id="GUID-25191728-63D1-5479-8B60-3B047E9FAD80"><p>To halt the video play <xref href="GUID-0F1F8AC6-B99F-3274-A785-9977197AF762.dita#GUID-0F1F8AC6-B99F-3274-A785-9977197AF762/GUID-C103A911-AF93-3350-B731-C186A279F1DC"><apiname>CVideoPlayerUtility::Stop()</apiname></xref> is called. </p> </li> <li id="GUID-950B9AA4-E72B-5FCD-91EB-623A98E290E2"><p>In order to unload all related controllers and return, use <xref href="GUID-0F1F8AC6-B99F-3274-A785-9977197AF762.dita#GUID-0F1F8AC6-B99F-3274-A785-9977197AF762/GUID-C30FFC28-BA6E-3467-9DE7-EE0FF6202E26"><apiname>CVideoPlayerUtility::Close()</apiname></xref>. </p> </li> </ol> <p>These high level steps are shown in the following example code: </p> <codeblock id="GUID-6CC6023A-FBFF-549B-BE29-16AF112D2BB3" xml:space="preserve">void CPlayVideo::Play() //Starts playback of the video clip |
15 { |
15 { |
16 iVideoUtility->Play(); |
16 iVideoUtility->Play(); |
17 } |
17 } |
18 |
18 |
19 void CPlayVideo::PauseL() //Call to this function will maintain the current position |
19 void CPlayVideo::PauseL() //Call to this function will maintain the current position |