我创建了一个avi视频文件，但它是未压缩的，而且它的大小很大。我想压缩视频文件以减小尺寸。我发现这个代码，但由于我是初学者，我无法设置压缩。有人能指出方向吗？
这是avi类：
#define STRICT
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <vfw.h>
#include "avi_utils.h"
// First, we'll define the WAV file format.
#include <pshpack1.h>
typedef struct
{ char id[4]; //="fmt "
unsigned long size; //=16
short wFormatTag; //=WAVE_FORMAT_PCM=1
unsigned short wChannels; //=1 or 2 for mono or stereo
unsigned long dwSamplesPerSec; //=11025 or 22050 or 44100
unsigned long dwAvgBytesPerSec; //=wBlockAlign * dwSamplesPerSec
unsigned short wBlockAlign; //=wChannels * (wBitsPerSample==8?1:2)
unsigned short wBitsPerSample; //=8 or 16, for bits per sample
} FmtChunk;
typedef struct
{ char id[4]; //="data"
unsigned long size; //=datsize, size of the following array
unsigned char data[1]; //=the raw data goes here
} DataChunk;
typedef struct
{ char id[4]; //="RIFF"
unsigned long size; //=datsize+8+16+4
char type[4]; //="WAVE"
FmtChunk fmt;
DataChunk dat;
} WavChunk;
#include <poppack.h>
// This is the internal structure represented by the HAVI handle:
typedef struct
{ IAVIFile *pfile; // created by CreateAvi
WAVEFORMATEX wfx; // as given to CreateAvi (.nChanels=0 if none was given). Used when audio stream is first created.
int period; // specified in CreateAvi, used when the video stream is first created
IAVIStream *as; // audio stream, initialised when audio stream is first created
IAVIStream *ps, *psCompressed; // video stream, when first created
unsigned long nframe, nsamp; // which frame will be added next, which sample will be added next
bool iserr; // if true, then no function will do anything
} TAviUtil;
HAVI CreateAvi(const char *fn, int frameperiod, const WAVEFORMATEX *wfx)
{ IAVIFile *pfile;
AVIFileInit();
HRESULT hr = AVIFileOpen(&pfile, fn, OF_WRITE|OF_CREATE, NULL);
if (hr!=AVIERR_OK) {AVIFileExit(); return NULL;}
TAviUtil *au = new TAviUtil;
au->pfile = pfile;
if (wfx==NULL) ZeroMemory(&au->wfx,sizeof(WAVEFORMATEX)); else CopyMemory(&au->wfx,wfx,sizeof(WAVEFORMATEX));
au->period = frameperiod;
au->as=0; au->ps=0; au->psCompressed=0;
au->nframe=0; au->nsamp=0;
au->iserr=false;
return (HAVI)au;
}
HRESULT CloseAvi(HAVI avi)
{ if (avi==NULL) return AVIERR_BADHANDLE;
TAviUtil *au = (TAviUtil*)avi;
if (au->as!=0) AVIStreamRelease(au->as); au->as=0;
if (au->psCompressed!=0) AVIStreamRelease(au->psCompressed); au->psCompressed=0;
if (au->ps!=0) AVIStreamRelease(au->ps); au->ps=0;
if (au->pfile!=0) AVIFileRelease(au->pfile); au->pfile=0;
AVIFileExit();
delete au;
return S_OK;
}
HRESULT SetAviVideoCompression(HAVI avi, HBITMAP hbm, AVICOMPRESSOPTIONS *opts, bool ShowDialog, HWND hparent)
{ if (avi==NULL) return AVIERR_BADHANDLE;
if (hbm==NULL) return AVIERR_BADPARAM;
DIBSECTION dibs; int sbm = GetObject(hbm,sizeof(dibs),&dibs);
if (sbm!=sizeof(DIBSECTION)) return AVIERR_BADPARAM;
TAviUtil *au = (TAviUtil*)avi;
if (au->iserr) return AVIERR_ERROR;
if (au->psCompressed!=0) return AVIERR_COMPRESSOR;
//
if (au->ps==0) // create the stream, if it wasn't there before
{ AVISTREAMINFO strhdr; ZeroMemory(&strhdr,sizeof(strhdr));
strhdr.fccType = streamtypeVIDEO;// stream type
strhdr.fccHandler = 0;
strhdr.dwScale = au->period;
strhdr.dwRate = 1000;
strhdr.dwSuggestedBufferSize = dibs.dsBmih.biSizeImage;
SetRect(&strhdr.rcFrame, 0, 0, dibs.dsBmih.biWidth, dibs.dsBmih.biHeight);
HRESULT hr=AVIFileCreateStream(au->pfile, &au->ps, &strhdr);
if (hr!=AVIERR_OK) {au->iserr=true; return hr;}
}
//
if (au->psCompressed==0) // set the compression, prompting dialog if necessary
{ AVICOMPRESSOPTIONS myopts; ZeroMemory(&myopts,sizeof(myopts));
AVICOMPRESSOPTIONS *aopts[1];
if (opts!=NULL) aopts[0]=opts; else aopts[0]=&myopts;
if (ShowDialog)
{ BOOL res = (BOOL)AVISaveOptions(hparent,0,1,&au->ps,aopts);
if (!res) {AVISaveOptionsFree(1,aopts); au->iserr=true; return AVIERR_USERABORT;}
}
HRESULT hr = AVIMakeCompressedStream(&au->psCompressed, au->ps, aopts[0], NULL);
AVISaveOptionsFree(1,aopts);
if (hr != AVIERR_OK) {au->iserr=true; return hr;}
DIBSECTION dibs; GetObject(hbm,sizeof(dibs),&dibs);
hr = AVIStreamSetFormat(au->psCompressed, 0, &dibs.dsBmih, dibs.dsBmih.biSize+dibs.dsBmih.biClrUsed*sizeof(RGBQUAD));
if (hr!=AVIERR_OK) {au->iserr=true; return hr;}
}
//
return AVIERR_OK;
}
HRESULT AddAviFrame(HAVI avi, HBITMAP hbm)
{ if (avi==NULL) return AVIERR_BADHANDLE;
if (hbm==NULL) return AVIERR_BADPARAM;
DIBSECTION dibs; int sbm = GetObject(hbm,sizeof(dibs),&dibs);
if (sbm!=sizeof(DIBSECTION)) return AVIERR_BADPARAM;
TAviUtil *au = (TAviUtil*)avi;
if (au->iserr) return AVIERR_ERROR;
//
if (au->ps==0) // create the stream, if it wasn't there before
{ AVISTREAMINFO strhdr; ZeroMemory(&strhdr,sizeof(strhdr));
strhdr.fccType = streamtypeVIDEO;// stream type
strhdr.fccHandler = 0;
strhdr.dwScale = au->period;
strhdr.dwRate = 1000;
strhdr.dwSuggestedBufferSize = dibs.dsBmih.biSizeImage;
SetRect(&strhdr.rcFrame, 0, 0, dibs.dsBmih.biWidth, dibs.dsBmih.biHeight);
HRESULT hr=AVIFileCreateStream(au->pfile, &au->ps, &strhdr);
if (hr!=AVIERR_OK) {au->iserr=true; return hr;}
}
//
// create an empty compression, if the user hasn't set any
if (au->psCompressed==0)
{ AVICOMPRESSOPTIONS opts; ZeroMemory(&opts,sizeof(opts));
opts.fccHandler=mmioFOURCC('D','I','B',' ');
HRESULT hr = AVIMakeCompressedStream(&au->psCompressed, au->ps, &opts, NULL);
if (hr != AVIERR_OK) {au->iserr=true; return hr;}
hr = AVIStreamSetFormat(au->psCompressed, 0, &dibs.dsBmih, dibs.dsBmih.biSize+dibs.dsBmih.biClrUsed*sizeof(RGBQUAD));
if (hr!=AVIERR_OK) {au->iserr=true; return hr;}
}
//
//Now we can add the frame
HRESULT hr = AVIStreamWrite(au->psCompressed, au->nframe, 1, dibs.dsBm.bmBits, dibs.dsBmih.biSizeImage, AVIIF_KEYFRAME, NULL, NULL);
if (hr!=AVIERR_OK) {au->iserr=true; return hr;}
au->nframe++; return S_OK;
}
HRESULT AddAviAudio(HAVI avi, void *dat, unsigned long numbytes)
{ if (avi==NULL) return AVIERR_BADHANDLE;
if (dat==NULL || numbytes==0) return AVIERR_BADPARAM;
TAviUtil *au = (TAviUtil*)avi;
if (au->iserr) return AVIERR_ERROR;
if (au->wfx.nChannels==0) return AVIERR_BADFORMAT;
unsigned long numsamps = numbytes*8 / au->wfx.wBitsPerSample;
if ((numsamps*au->wfx.wBitsPerSample/8)!=numbytes) return AVIERR_BADPARAM;
//
if (au->as==0) // create the stream if necessary
{ AVISTREAMINFO ahdr; ZeroMemory(&ahdr,sizeof(ahdr));
ahdr.fccType=streamtypeAUDIO;
ahdr.dwScale=au->wfx.nBlockAlign;
ahdr.dwRate=au->wfx.nSamplesPerSec*au->wfx.nBlockAlign;
ahdr.dwSampleSize=au->wfx.nBlockAlign;
ahdr.dwQuality=(DWORD)-1;
HRESULT hr = AVIFileCreateStream(au->pfile, &au->as, &ahdr);
if (hr!=AVIERR_OK) {au->iserr=true; return hr;}
hr = AVIStreamSetFormat(au->as,0,&au->wfx,sizeof(WAVEFORMATEX));
if (hr!=AVIERR_OK) {au->iserr=true; return hr;}
}
//
// now we can write the data
HRESULT hr = AVIStreamWrite(au->as,au->nsamp,numsamps,dat,numbytes,0,NULL,NULL);
if (hr!=AVIERR_OK) {au->iserr=true; return hr;}
au->nsamp+=numsamps; return S_OK;
}
HRESULT AddAviWav(HAVI avi, const char *src, DWORD flags)
{ if (avi==NULL) return AVIERR_BADHANDLE;
if (flags!=SND_MEMORY && flags!=SND_FILENAME) return AVIERR_BADFLAGS;
if (src==0) return AVIERR_BADPARAM;
TAviUtil *au = (TAviUtil*)avi;
if (au->iserr) return AVIERR_ERROR;
//
char *buf=0; WavChunk *wav = (WavChunk*)src;
if (flags==SND_FILENAME)
{ HANDLE hf=CreateFile(src,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,0,NULL);
if (hf==INVALID_HANDLE_VALUE) {au->iserr=true; return AVIERR_FILEOPEN;}
DWORD size = GetFileSize(hf,NULL);
buf = new char[size];
DWORD red; ReadFile(hf,buf,size,&red,NULL);
CloseHandle(hf);
wav = (WavChunk*)buf;
}
//
// check that format doesn't clash
bool badformat=false;
if (au->wfx.nChannels==0)
{ au->wfx.wFormatTag=wav->fmt.wFormatTag;
au->wfx.cbSize=0;
au->wfx.nAvgBytesPerSec=wav->fmt.dwAvgBytesPerSec;
au->wfx.nBlockAlign=wav->fmt.wBlockAlign;
au->wfx.nChannels=wav->fmt.wChannels;
au->wfx.nSamplesPerSec=wav->fmt.dwSamplesPerSec;
au->wfx.wBitsPerSample=wav->fmt.wBitsPerSample;
}
else
{ if (au->wfx.wFormatTag!=wav->fmt.wFormatTag) badformat=true;
if (au->wfx.nAvgBytesPerSec!=wav->fmt.dwAvgBytesPerSec) badformat=true;
if (au->wfx.nBlockAlign!=wav->fmt.wBlockAlign) badformat=true;
if (au->wfx.nChannels!=wav->fmt.wChannels) badformat=true;
if (au->wfx.nSamplesPerSec!=wav->fmt.dwSamplesPerSec) badformat=true;
if (au->wfx.wBitsPerSample!=wav->fmt.wBitsPerSample) badformat=true;
}
if (badformat) {if (buf!=0) delete[] buf; return AVIERR_BADFORMAT;}
//
if (au->as==0) // create the stream if necessary
{ AVISTREAMINFO ahdr; ZeroMemory(&ahdr,sizeof(ahdr));
ahdr.fccType=streamtypeAUDIO;
ahdr.dwScale=au->wfx.nBlockAlign;
ahdr.dwRate=au->wfx.nSamplesPerSec*au->wfx.nBlockAlign;
ahdr.dwSampleSize=au->wfx.nBlockAlign;
ahdr.dwQuality=(DWORD)-1;
HRESULT hr = AVIFileCreateStream(au->pfile, &au->as, &ahdr);
if (hr!=AVIERR_OK) {if (buf!=0) delete[] buf; au->iserr=true; return hr;}
hr = AVIStreamSetFormat(au->as,0,&au->wfx,sizeof(WAVEFORMATEX));
if (hr!=AVIERR_OK) {if (buf!=0) delete[] buf; au->iserr=true; return hr;}
}
//
// now we can write the data
unsigned long numbytes = wav->dat.size;
unsigned long numsamps = numbytes*8 / au->wfx.wBitsPerSample;
HRESULT hr = AVIStreamWrite(au->as,au->nsamp,numsamps,wav->dat.data,numbytes,0,NULL,NULL);
if (buf!=0) delete[] buf;
if (hr!=AVIERR_OK) {au->iserr=true; return hr;}
au->nsamp+=numsamps; return S_OK;
}
unsigned int FormatAviMessage(HRESULT code, char *buf,unsigned int len)
{ const char *msg="unknown avi result code";
switch (code)
{ case S_OK: msg="Success"; break;
case AVIERR_BADFORMAT: msg="AVIERR_BADFORMAT: corrupt file or unrecognized format"; break;
case AVIERR_MEMORY: msg="AVIERR_MEMORY: insufficient memory"; break;
case AVIERR_FILEREAD: msg="AVIERR_FILEREAD: disk error while reading file"; break;
case AVIERR_FILEOPEN: msg="AVIERR_FILEOPEN: disk error while opening file"; break;
case REGDB_E_CLASSNOTREG: msg="REGDB_E_CLASSNOTREG: file type not recognised"; break;
case AVIERR_READONLY: msg="AVIERR_READONLY: file is read-only"; break;
case AVIERR_NOCOMPRESSOR: msg="AVIERR_NOCOMPRESSOR: a suitable compressor could not be found"; break;
case AVIERR_UNSUPPORTED: msg="AVIERR_UNSUPPORTED: compression is not supported for this type of data"; break;
case AVIERR_INTERNAL: msg="AVIERR_INTERNAL: internal error"; break;
case AVIERR_BADFLAGS: msg="AVIERR_BADFLAGS"; break;
case AVIERR_BADPARAM: msg="AVIERR_BADPARAM"; break;
case AVIERR_BADSIZE: msg="AVIERR_BADSIZE"; break;
case AVIERR_BADHANDLE: msg="AVIERR_BADHANDLE"; break;
case AVIERR_FILEWRITE: msg="AVIERR_FILEWRITE: disk error while writing file"; break;
case AVIERR_COMPRESSOR: msg="AVIERR_COMPRESSOR"; break;
case AVIERR_NODATA: msg="AVIERR_READONLY"; break;
case AVIERR_BUFFERTOOSMALL: msg="AVIERR_BUFFERTOOSMALL"; break;
case AVIERR_CANTCOMPRESS: msg="AVIERR_CANTCOMPRESS"; break;
case AVIERR_USERABORT: msg="AVIERR_USERABORT"; break;
case AVIERR_ERROR: msg="AVIERR_ERROR"; break;
}
unsigned int mlen=(unsigned int)strlen(msg);
if (buf==0 || len==0) return mlen;
unsigned int n=mlen; if (n+1>len) n=len-1;
strncpy(buf,msg,n); buf[n]=0;
return mlen;
}
这是我的主要内容：
int main ()
{
const char *fns[] = {"1.bmp","2.bmp","3.bmp","4.bmp","5.bmp"};
HAVI avi = CreateAvi("test.avi",1000/5,NULL);
for (int i=0; i<sizeof(fns)/sizeof(fns[0]); i++)
{
HBITMAP hbm=(HBITMAP)LoadImage(NULL,fns[i],IMAGE_BITMAP,0,0,LR_LOADFROMFILE|LR_CREATEDIBSECTION);
AddAviFrame(avi,hbm);
DeleteObject(hbm);
}
AddAviWav(avi,"wav.wav",SND_FILENAME);
CloseAvi(avi);
}
我应该在主要做什么？
答案 0 :(得分：0)
由于“使用DirectShow”位于标记行中，因此您使用DirectShow执行此操作。首先，您不直接写入文件，也不需要知道容器文件/格式的结构。标准AVI Mux Filter组件执行多路复用，File Writer Filter为您编写。 Building the Recompression Graph向您介绍了如何完成工作（您需要下面最右半部分的图片）。
Pipleine http://i.msdn.microsoft.com/dynimg/IC420247.png
“困难”部分是在管道的源部分，您有一个非DirectShow流，一个简单的图像序列。您需要将它们“注入”到管道/图形中，以便它们通过组件并最终到达文件。
一种典型的方法是在Windows SDK中引用Push Source示例并实现生成视频流的过滤器。这是您的图像将被输入处理的位置。
