使用DirectShow壓縮AVI視頻文件

Question

我創建了一個avi視頻文件，但該文件未壓縮且尺寸很大。 我想壓縮視頻文件以減小大小。 我找到了這段代碼，但是作為我的初學者，我無法設置壓縮率。 有人能指出路嗎？

這是avi類：

#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;
}

這是我的主要內容：

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);

}

我該怎么辦？

Answer 1

由於在標記行中包含“ using DirectShow”，因此您將使用DirectShow。 首先，您不需要直接寫入文件，也不需要知道容器文件/格式的結構。 標准AVI Mux篩選器組件執行多路復用，而File Writer篩選器則為您寫。 構建“重新壓縮圖”將向您介紹操作方式（您需要以下圖片的最右邊一半）。

Pipleine http://i.msdn.microsoft.com/dynimg/IC420247.png

“困難”的部分是在管道的源部分上，您具有非DirectShow流，即簡單的圖像序列。 您將需要將它們“注入”到管道/圖形中，以便它們通過組件並最終到達文件。

一種典型的方法是引用Windows SDK中的Push Source示例並實現生成視頻流的篩選器。 這是您的圖像將被送入處理的地方。