Limiting the Playback Scope - Win32 Multimedia Programmer's Reference

Custom Search

Limiting the Playback Scope

Controlling playback begins with the MCIWndPlay macro, which plays the content or file associated with an MCIWnd window from the current playback position to the end of the content. If you want to limit playback to a specific portion of the content or file, you can choose from the other playback MCIWnd macros: MCIWndPlayFrom, MCIWndPlayTo, and MCIWndPlayFromTo.

You also need to set an appropriate time format. The time format determines whether the content is measured in frames, milliseconds, tracks, or some other units.

The following example creates an MCIWnd window and provides menu commands to play the last third, first third, or middle third of the content. These menu commands use MCIWndPlayFrom, MCIWndPlayTo, and MCIWndPlayFromTo to play the content segments. The example also uses the MCIWndGetStart and MCIWndGetEnd macros to identify the beginning and end of the content, and it uses the MCIWndHome macro to move the playback position to the beginning of the content.

The MCIWndCreate function uses the WS_CAPTION and MCIWNDF_SHOWALL styles in addition to the standard window styles to display the filename, mode, and current playback position in the title bar of the MCIWnd window.

case WM_COMMAND:

switch (wParam)

{

case IDM_CREATEMCIWND:

g_hwndMCIWnd = MCIWndCreate(hwnd,

g_hinst,

WS_CHILD | WS_VISIBLE | WS_CAPTION |

MCIWNDF_SHOWALL,

"sample.avi");

break;

case IDM_PLAYFROM: // plays last third of clip

MCIWndUseTime(g_hwndMCIWnd); // millisecond format

// Get media start and end positions.

lStart = MCIWndGetStart(g_hwndMCIWnd);

lEnd = MCIWndGetEnd(g_hwndMCIWnd);

// Determine playback end position.

lPlayStart = 2 * (lEnd - lStart) / 3 + lStart;

MCIWndPlayFrom(g_hwndMCIWnd, lPlayStart);

break;

case IDM_PLAYTO: // plays first third of clip

MCIWndUseTime(g_hwndMCIWnd); // millisecond format

// Get media start and end positions.

lStart = MCIWndGetStart(g_hwndMCIWnd);

lEnd = MCIWndGetEnd(g_hwndMCIWnd);

// Determine playback start position.

lPlayEnd = (lEnd - lStart) / 3 + lStart;

MCIWndHome(g_hwndMCIWnd);

MCIWndPlayTo(g_hwndMCIWnd, lPlayEnd);

break;

case IDM_PLAYSOME: // plays middle third of clip

MCIWndUseTime(g_hwndMCIWnd); // millisecond format

// Get media start and end positions.

lStart = MCIWndGetStart(g_hwndMCIWnd);

lEnd = MCIWndGetEnd(g_hwndMCIWnd);

// Determine playback start and end positions.

lPlayStart = (lEnd - lStart) / 3 + lStart;
lPlayEnd = 2 * (lEnd - lStart) / 3 + lStart;

MCIWndPlayFromTo(g_hwndMCIWnd, lPlayStart, lPlayEnd);

break;

// Handle other commands here.

}

Last news from Greatis Software

    Nostalgia .Net     .Net is powerful, but not all-powerful, so sometimes we need to use Win32 API for our .Net applications. It's simple enough with Platform Invoke if you have Win32 skill, but we do not always have time to dig the ancient documentation, declare the special types that are compatible with Win32, find the values of the Win32's constants and so on. Nostalgia .Net offers several simple-to-use classes, and components that will allow you to forget about the headache of Win32 and just use the power of Win32 in your application the same way as you use the native. Net classes. More »

Recommended software for developers

    Ultimate Pack     Component pack for Delphi and C++ Builder that contains runtime form designer, runtime object inspector, print suite and much more for the very special price. More »

    Form Designer .Net     Unique runtime form design solution that allows to edit any form in .Net WinForms application at runtime with full source codes for only 300 euro! More »

    Print Suite .Net     Print Suite .Net is a set of components for easy printing texts, images and grids from your WinForms applications. Full C# source codes are available More »

    Gradient Controls .Net     Gradient Controls .Net offers controls with gradient background feature. Labels, panels and so on... Full C# source codes are available More »

    Greatis iGrid     iGrid plots drawing grid right over your desktop, so you can use it everywhere, with any drawing application without any special plugins for different graphic editors. More »

All the contacts and projects

Dmitry Vasiliev (just.dmitry)

More Online Helps

Win32 Programmer's Reference
Win32 Multimedia Programmer's Reference
OLE Programmer's Reference
Microsoft Windows Pen API Programmer's Reference
Microsoft Windows Sockets 2 Reference
Microsoft Windows Telephony API (TAPI) Programmer's Reference
Unix Manual Pages

greatis just4fun network