Difference between revisions of "Multimedia Programming"
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=See also= | =See also= |
Revision as of 16:31, 20 April 2013
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Playing Videos
Starting a player application
Once you know the command line and parameters you can use TProcessUTF8 to start the player:
uses
Classes, ..., LCLProc, UTF8Process;
...
implementation
procedure TMainForm.Button1Click(Sender: TObject);
var
Player: TProcessUTF8;
begin
Player:=TProcessUTF8.Create(nil);
try
Player.CommandLine:=PathToPlayer+' '+ParametersAndMediaFile;
Player.Execute;
finally
Player.Free;
end;
end;
For example to start under Linux the mplayer to play a video use:
uses
Classes, ..., FileUtil, LCLProc, UTF8Process;
...
implementation
procedure TMainForm.Button1Click(Sender: TObject);
var
Player: TProcessUTF8;
Filename: String;
PlayerPath: String;
PlayerParams: String;
begin
Filename:='/home/username/video.mpg';
PlayerPath:=FindDefaultExecutablePath('mplayer');
PlayerParams:='"'+Filename+'"';
Player:=TProcessUTF8.Create(nil);
try
Player.CommandLine:=PlayerPath+' '+PlayerParams;
Player.Execute;
finally
Player.Free;
end;
end;
VFW - Video for Windows
Capturing and playing video streams from TV cards and webcams under Windows the VFW API can be used with SysRec.
MPlayer for Linux gtk2/X
mplayer is an open source and free movie player. There is a LCL control embedding the mplayer, so you can built your own movie players or just play a video in your application. You can download it here:
svn co https://lazarus-ccr.svn.sourceforge.net/svnroot/lazarus-ccr/components/mplayer mplayer
Playing Sounds
Windows only: using the Windows API
You can use the Windows API to play e.g. wav files:
...
uses MMSystem;
...
sndPlaySound('C:\sounds\test.wav', snd_Async or snd_NoDefault);
Obviously, this is not cross-platform
Using the Audio Component Suite
Read the page about the Audio Component Suite
Using the OpenAL Library
A tutorial for Delphi can be found here: [1]
Free Pascal comes with a unit for accessing OpenAL located in fpc/packages/openal as well as usage examples
BASS
The BASS library can be downloaded from: http://www.un4seen.com/ and http://www.un4seen.com/forum/?topic=8682.0
There is a DJ application, for Windows, Linux and Mac OSX, written with Lazarus and using Bass lib: https://sites.google.com/site/fiensprototyping/
Audiere Library
Has bindings for Delphi, but they don't work with FPC:
- http://www.casteng.com/whypascal.shtml
- http://www.afterwarp.net/resources/soundlib
- http://code.google.com/p/audiere-bind-delphi/
Audorra Library
Works fine with Lazarus:
http://sourceforge.net/projects/audorra/
OMEGA Engine
The OMEGA Engine is a full game engine in single Omega.dll file which is just 50kb. It can successfully play FLAC,OGG,MP3,MP2,AMR and WMA files. It searches and uses installed audio codecs from the system.
http://sourceforge.net/projects/omega-engine/files/
The project is dead, but is very easy to use:
Media_Play('Music.mp3', TRUE);
PortAudio
Various bindings for PortAudio, a cross-platform, open source library for audio playback and recording are available. See [[2]] for some versions. Forum user FredvS has written a Pascal unit that dynamically loads PortAudio: [3]
SDL + SDL_mixer
The basic SDL library comes with a very simple sound system. On top of that, SDL mixer adds more sound APIs which build a more flexible solution.
FMOD
Is a closed source solution. It is free for use for non-comercial software, but requires the payment of licenses for commercial software.
Squall sound
Squall sound works fine with FPC. It has 3D audio and EAX effects, but just supports MP3, OGG and WAV formats.
http://www.afterwarp.net/resources/soundlib
FPSound
FPSound is a new library being developed on the molds of fpspreadsheet and fpvectorial: it has independent modules to read, write and play sound files and also an intermediary representation for editing. See FPSound
UOS (United OpenLib of Sound)
UOS : United OpenLib of Sound. UOS unifies the best open-source audio libraries.
With UOS you can:
. Listen to mp3, ogg, wav, flac,... audio files.
. With 16, 32 or float 32 bit resolution.
. Record all types of input into file.
. Add DSP effects and filters, however many you want and record it.
. Listen to multiple inputs and outputs.
UOS uses the PortAudio, SndFile and Mpg123 audio libraries.
Included in the package:
- examples.
- binary libraries for Linux 32/64, Windows 32/64, Mac OSX 32.
http://sites.google.com/site/fiensprototyping/U_OS_Test.tar.gz