C#将图像文件压缩为AVI文件播放

本文介绍了一个名为AVIWriter的类,用于创建AVI格式的视频文件。通过该类,用户可以指定帧率、宽度和高度来初始化一个Bitmap对象作为视频的第一帧,并进一步加载和添加更多帧。此外,还提供了如何利用该类进行视频制作的具体实例。
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usingSystem;
usingSystem.Runtime.InteropServices;
usingSystem.Drawing;
usingSystem.Drawing.Imaging;

namespaceorg.loon.util
...{
/**////<summary>
///AVIWriter的摘要说明,chenpeng,Email:ceponline@yahoo.com.cn。
///</summary>

publicclassAVIWriter
...{
conststringAVIFILE32="AVIFIL32";
privateint_pfile=0;
privateIntPtr_ps=newIntPtr(0);
privateIntPtr_psCompressed=newIntPtr(0);
privateUInt32_frameRate=0;
privateint_count=0;
privateUInt32_width=0;
privateUInt32_stride=0;
privateUInt32_height=0;
//avi标识
privateUInt32_fccType=1935960438;//vids
privateUInt32_fccHandler=808810089;//IV50

privateBitmap_bmp;

[DllImport(AVIFILE32)]
privatestaticexternvoidAVIFileInit();

[DllImport(AVIFILE32)]
privatestaticexternintAVIFileOpenW(refintptr_pfile,[MarshalAs(UnmanagedType.LPWStr)]stringfileName,intflags,intdummy);

[DllImport(AVIFILE32)]
privatestaticexternintAVIFileCreateStream(intptr_pfile,outIntPtrptr_ptr_avi,refAVISTREAMINFOWptr_streaminfo);
[DllImport(AVIFILE32)]
privatestaticexternintAVIMakeCompressedStream(outIntPtrppsCompressed,IntPtraviStream,refAVICOMPRESSOPTIONSao,intdummy);

[DllImport(AVIFILE32)]
privatestaticexternintAVIStreamSetFormat(IntPtraviStream,Int32lPos,refBITMAPINFOHEADERlpFormat,Int32cbFormat);

[DllImport(AVIFILE32)]
unsafeprivatestaticexternintAVISaveOptions(inthwnd,UInt32flags,intnStreams,IntPtr*ptr_ptr_avi,AVICOMPRESSOPTIONS**ao);

[DllImport(AVIFILE32)]
privatestaticexternintAVIStreamWrite(IntPtraviStream,Int32lStart,Int32lSamples,IntPtrlpBuffer,Int32cbBuffer,Int32dwFlags,Int32dummy1,Int32dummy2);

[DllImport(AVIFILE32)]
privatestaticexternintAVIStreamRelease(IntPtraviStream);

[DllImport(AVIFILE32)]
privatestaticexternintAVIFileRelease(intpfile);

[DllImport(AVIFILE32)]
privatestaticexternvoidAVIFileExit();

[StructLayout(LayoutKind.Sequential,Pack
=1)]
privatestructAVISTREAMINFOW
...{
publicUInt32fccType;
publicUInt32fccHandler;
publicUInt32dwFlags;
publicUInt32dwCaps;
publicUInt16wPriority;
publicUInt16wLanguage;
publicUInt32dwScale;
publicUInt32dwRate;
publicUInt32dwStart;
publicUInt32dwLength;
publicUInt32dwInitialFrames;
publicUInt32dwSuggestedBufferSize;
publicUInt32dwQuality;
publicUInt32dwSampleSize;
publicUInt32rect_left;
publicUInt32rect_top;
publicUInt32rect_right;
publicUInt32rect_bottom;
publicUInt32dwEditCount;
publicUInt32dwFormatChangeCount;
publicUInt16szName0;
publicUInt16szName1;
publicUInt16szName2;
publicUInt16szName3;
publicUInt16szName4;
publicUInt16szName5;
publicUInt16szName6;
publicUInt16szName7;
publicUInt16szName8;
publicUInt16szName9;
publicUInt16szName10;
publicUInt16szName11;
publicUInt16szName12;
publicUInt16szName13;
publicUInt16szName14;
publicUInt16szName15;
publicUInt16szName16;
publicUInt16szName17;
publicUInt16szName18;
publicUInt16szName19;
publicUInt16szName20;
publicUInt16szName21;
publicUInt16szName22;
publicUInt16szName23;
publicUInt16szName24;
publicUInt16szName25;
publicUInt16szName26;
publicUInt16szName27;
publicUInt16szName28;
publicUInt16szName29;
publicUInt16szName30;
publicUInt16szName31;
publicUInt16szName32;
publicUInt16szName33;
publicUInt16szName34;
publicUInt16szName35;
publicUInt16szName36;
publicUInt16szName37;
publicUInt16szName38;
publicUInt16szName39;
publicUInt16szName40;
publicUInt16szName41;
publicUInt16szName42;
publicUInt16szName43;
publicUInt16szName44;
publicUInt16szName45;
publicUInt16szName46;
publicUInt16szName47;
publicUInt16szName48;
publicUInt16szName49;
publicUInt16szName50;
publicUInt16szName51;
publicUInt16szName52;
publicUInt16szName53;
publicUInt16szName54;
publicUInt16szName55;
publicUInt16szName56;
publicUInt16szName57;
publicUInt16szName58;
publicUInt16szName59;
publicUInt16szName60;
publicUInt16szName61;
publicUInt16szName62;
publicUInt16szName63;
}


[StructLayout(LayoutKind.Sequential,Pack
=1)]
privatestructAVICOMPRESSOPTIONS
...{
publicUInt32fccType;
publicUInt32fccHandler;
publicUInt32dwKeyFrameEvery;

publicUInt32dwQuality;
publicUInt32dwBytesPerSecond;

publicUInt32dwFlags;
publicIntPtrlpFormat;
publicUInt32cbFormat;
publicIntPtrlpParms;
publicUInt32cbParms;
publicUInt32dwInterleaveEvery;
}


[StructLayout(LayoutKind.Sequential,Pack
=1)]
publicstructBITMAPINFOHEADER
...{
publicUInt32biSize;
publicInt32biWidth;
publicInt32biHeight;
publicInt16biPlanes;
publicInt16biBitCount;
publicUInt32biCompression;
publicUInt32biSizeImage;
publicInt32biXPelsPerMeter;
publicInt32biYPelsPerMeter;
publicUInt32biClrUsed;
publicUInt32biClrImportant;
}


publicclassAviException:ApplicationException
...{
publicAviException(strings):base(s)...{}
publicAviException(strings,Int32hr)
:
base(s)
...{

if(hr==AVIERR_BADPARAM)
...{
err_msg
="AVIERR_BADPARAM";
}

else
...{
err_msg
="unknown";
}

}


publicstringErrMsg()
...{
returnerr_msg;
}

privateconstInt32AVIERR_BADPARAM=-2147205018;
privatestringerr_msg;
}


publicBitmapCreate(stringfileName,UInt32frameRate,intwidth,int
height)
...{
_frameRate
=frameRate;
_width
=(UInt32)width;
_height
=(UInt32)height;
_bmp
=newBitmap(width,height,PixelFormat.Format24bppRgb);
//锁定为24位位图
BitmapDatabmpDat=_bmp.LockBits(newRectangle(0,0,width,
height),ImageLockMode.ReadOnly,PixelFormat.Format24bppRgb);
_stride
=(UInt32)bmpDat.Stride;
_bmp.UnlockBits(bmpDat);
AVIFileInit();
inthr=AVIFileOpenW(ref_pfile,fileName,4097,0);
if(hr!=0)
...{
thrownewAviException("Create错误!");
}


CreateStream();
SetOptions();

return_bmp;
}


publicvoidAddFrame()
...{

BitmapDatabmpDat
=_bmp.LockBits(
newRectangle(0,0,(int)_width,(int)_height),
ImageLockMode.ReadOnly,PixelFormat.Format24bppRgb);

inthr=AVIStreamWrite(_psCompressed,_count,1,
bmpDat.Scan0,
(Int32)(_stride
*_height),
0,
0,
0);

if(hr!=0)
...{
thrownewAviException("AVIStreamWrite");
}


_bmp.UnlockBits(bmpDat);

_count
++;
}


publicvoidLoadFrame(Bitmapnextframe)
...{

_bmp
=newBitmap(nextframe);
}


publicvoidClose()
...{
AVIStreamRelease(_ps);
AVIStreamRelease(_psCompressed);

AVIFileRelease(_pfile);
AVIFileExit();
}


/**////<summary>
///创建流文件
///</summary>

privatevoidCreateStream()
...{
AVISTREAMINFOWstrhdr
=newAVISTREAMINFOW();
strhdr.fccType
=_fccType;
strhdr.fccHandler
=_fccHandler;
strhdr.dwFlags
=0;
strhdr.dwCaps
=0;
strhdr.wPriority
=0;
strhdr.wLanguage
=0;
strhdr.dwScale
=1;
strhdr.dwRate
=_frameRate;
strhdr.dwStart
=0;
strhdr.dwLength
=0;
strhdr.dwInitialFrames
=0;
strhdr.dwSuggestedBufferSize
=_height*_stride;
strhdr.dwQuality
=0xffffffff;
strhdr.dwSampleSize
=0;
strhdr.rect_top
=0;
strhdr.rect_left
=0;
strhdr.rect_bottom
=_height;
strhdr.rect_right
=_width;
strhdr.dwEditCount
=0;
strhdr.dwFormatChangeCount
=0;
strhdr.szName0
=0;
strhdr.szName1
=0;

inthr=AVIFileCreateStream(_pfile,out_ps,refstrhdr);

if(hr!=0)
...{
thrownewAviException("AVIFileCreateStream");
}

}


/**////<summary>
///设置参数
///</summary>

unsafeprivatevoidSetOptions()
...{
AVICOMPRESSOPTIONSopts
=newAVICOMPRESSOPTIONS();
opts.fccType
=_fccType;
opts.fccHandler
=0;
opts.dwKeyFrameEvery
=0;
opts.dwQuality
=0;
opts.dwFlags
=0;
opts.dwBytesPerSecond
=0;
opts.lpFormat
=newIntPtr(0);
opts.cbFormat
=0;
opts.lpParms
=newIntPtr(0);
opts.cbParms
=0;
opts.dwInterleaveEvery
=0;

AVICOMPRESSOPTIONS
*p=&opts;
AVICOMPRESSOPTIONS
**pp=&p;

IntPtrx
=_ps;
IntPtr
*ptr_ps=&x;

AVISaveOptions(
0,0,1,ptr_ps,pp);

inthr=AVIMakeCompressedStream(out_psCompressed,_ps,ref
opts,
0);
if(hr!=0)
...{
thrownewAviException("AVIMakeCompressedStream");
}


BITMAPINFOHEADERbi
=newBITMAPINFOHEADER();
bi.biSize
=40;
bi.biWidth
=(Int32)_width;
bi.biHeight
=(Int32)_height;
bi.biPlanes
=1;
bi.biBitCount
=24;
bi.biCompression
=0;
bi.biSizeImage
=_stride*_height;
bi.biXPelsPerMeter
=0;
bi.biYPelsPerMeter
=0;
bi.biClrUsed
=0;
bi.biClrImportant
=0;

hr
=AVIStreamSetFormat(_psCompressed,0,refbi,40);
if(hr!=0)
...{
thrownewAviException("AVIStreamSetFormat",hr);
}

}




}
;

}


运行:

org.loon.util.FileUtilfile=neworg.loon.util.FileUtil();
org.loon.util.AVIWriteraviWriter
=neworg.loon.util.AVIWriter();
//ps:avi中所有图像皆不能小于width及height
Bitmapavi_frame=aviWriter.Create("d:/mytest.avi",1,700,700);
//获得指定目录下文件列表的list
IListlist=file.ListFile("D:/罗德岛战记/罗德岛战记1/");
foreach(stringsinlist)
...{
//获得图像
Bitmapcache=newBitmap("D:/罗德岛战记/罗德岛战记1/"+s);
//由于转化为avi后呈现相反,所以翻转
cache.RotateFlip(RotateFlipType.Rotate180FlipX);
//载入图像
aviWriter.LoadFrame(cache);
aviWriter.AddFrame();
}

//释放资源
aviWriter.Close();
avi_frame.Dispose();


播放画面如下:


生成的文件属性如下,与我们设定的参数相符:






是 不是很简单?实际上,借助于avifile32 api,我们甚至可以改变文件压缩格式,加入背景音乐,乃至植入病毒(咳,通常我们结合桌面截图及avi生成还有模拟键盘,就可以远程操作或者监控、记录 电脑操作……)总之,在windows下操作avi文件是一件再简单没有的事情了。

有兴趣的话可以这两篇博文为基础,将其修改为自己的字幕组工具、屏幕录像工具、乃至远程监控工具等。有疑问的话,可以发email到:ceponline@yahoo.com.cn
Easiest way to install: Load the program group AviDemo.bpg, install the package AviPack.dpk(bpl), try the demos. Read the source of AviWriter_2.pas (in AviPack) to get help on what the procedures and properties do. **Current version: AviWriter_2 ver 1.0.0.4 Changes: Finally got On-the-fly compression working with still being able to add an audio-stream. Use property OnTheFlyCompression (default is true) Also, now more than one audio file can be added. For each wav-file a delay (ms) can be specified, which says when it'll start playing. Use method AddWaveFile. In 1.0.0.3 the delay got too short. Now it seems to work, due to really adding "silence" from the end of the previous audio file. Note: Some Codecs don't support On-the-fly compression. If OnTheFlyCompression is false, only one wave file can be added. **A list of codec-gotchas: (still unclear about the exact range of occurrance) IV50 Indeo Video 5: Both frame dimensions must be a factor of 4. DIVX DivX codec: Both frame dimensions must be a factor of 4. Gives a floating point error under certain circumstances. More and more likely that this occurs if the frames are too "different". If this happens, then there's an AV in Avifil32.dll, don't know how to prevent this. The codec compresses real movies nicely at frametimes <=60 ms, when changing the settings in its dialog box as follows: Bitrate (1st page): to >=1300 Max Keyframe interval (2nd page): to <=20. MRLE MS-RLE Use that one if you want to make avis which play transparently in a TAnimate. (Thanks Eddie Shipman) But it does not support on-the-fly compression. Whenever a codec fails to work, there's this dreaded error "A call to an operating system function failed" while writing a compressed file, or an unhandled exception. The only way to prevent it, that I see, is, to collect more peculiarities about the codecs and stop execution in case of certain combinations of settings. When queried about their capabilities, some of these guys seem to lie. Renate Schaaf renates@xmission.com
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