EasyPlayerPro-win截图功能实现

背景描述

作为一个播放器，截图功能必不可少; 下面主要记录一下截图功能的实现;

实现流程

将解码后的帧进行格式转换(目标格式为RGB24);
采用独立的线程进行截图处理;
截图可保存为BMP或JPG两种格式;

图片存放于EasyPlayerPro\Snapshot文件夹, 如下图:

代码实现

#define _WIDTHBYTES(c)  ((c+31)/32*4)   // c = width * bppint Snapshot2File(RENDER_FORMAT renderFormat, SNAPSHOT_IMAGE_T *pSnapshot, char *pbuf){PBYTE   pDest = NULL, pDest16 = NULL;INT     nBpp;DWORD   dwW, dwH, dwWB;int     ret = 0;int image_format = pSnapshot->imageFormat;if (renderFormat == RENDER_FORMAT_YUY2)             nBpp    =   16;else if (renderFormat == RENDER_FORMAT_UYVY)        nBpp    =   16;else if (renderFormat == RENDER_FORMAT_X8R8G8B8)    nBpp    =   32;     //okelse if (renderFormat == RENDER_FORMAT_A8R8G8B8)    nBpp    =   32;     //okelse if (renderFormat == RENDER_FORMAT_RGB565)      nBpp    =   16;     //okelse if (renderFormat == RENDER_FORMAT_RGB555)      nBpp    =   16;     //okelse if (renderFormat == RENDER_FORMAT_RGB24_GDI)   nBpp    =   24;else    return -1;      //格式错误dwW  = pSnapshot->width;dwH  = pSnapshot->height;dwWB = _WIDTHBYTES( dwW * nBpp );if (image_format == 0x00){    //BMP    int iFilenameLen = (int)strlen(pSnapshot->filename);    if ( (0 != memcmp(pSnapshot->filename+iFilenameLen-3, "bmp", 3)) &&        (0 != memcmp(pSnapshot->filename+iFilenameLen-3, "BMP", 3)) &&        (0 != memcmp(pSnapshot->filename+iFilenameLen-3, "Bmp", 3)) )    {        if (pSnapshot->filename[iFilenameLen-4] == '.')        {            for (int i=iFilenameLen-1; i>0; i--)            {                if (pSnapshot->filename[i] == '.')                {                    pSnapshot->filename[i] = '\0';                    break;                }                else                {                    pSnapshot->filename[i] = '\0';                }            }        }        strcat(pSnapshot->filename, ".bmp");    }    HANDLE hFile = CreateFile( pSnapshot->filename, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE,        NULL,       CREATE_ALWAYS,  FILE_ATTRIBUTE_NORMAL,  NULL );    if( hFile == INVALID_HANDLE_VALUE ) return E_HANDLE;    // SaveFile to BMP    BITMAPFILEHEADER bfh = {0};    bfh.bfType      = 0x4D42;    bfh.bfSize      = 0;    bfh.bfReserved1 = 0;    bfh.bfReserved2 = 0;    bfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);    if( nBpp == 16 ) {        bfh.bfOffBits += sizeof(RGBQUAD) * 3;    }    else        if( nBpp == 24 ) {            bfh.bfOffBits += sizeof(RGBQUAD) * 1;        }        else            if( nBpp == 32 ) {                bfh.bfOffBits += sizeof(RGBQUAD) * 1;            }            DWORD dwWriteLength = sizeof(BITMAPFILEHEADER);            DWORD dwWrittenLength = 0;            WriteFile( hFile, (PVOID)&bfh, dwWriteLength, &dwWrittenLength, NULL );            BITMAPINFOHEADER    bih = {0};            bih.biSize      = sizeof(BITMAPINFOHEADER);            bih.biWidth     = dwW;            bih.biHeight    = -(INT)dwH;            bih.biPlanes    = 1;            bih.biBitCount  = nBpp;            bih.biCompression   = (nBpp == 16) ? BI_BITFIELDS : BI_RGB;            bih.biSizeImage     = dwWB * pSnapshot->height;            bih.biXPelsPerMeter = 0;            bih.biYPelsPerMeter = 0;            bih.biClrUsed       = 0;            bih.biClrImportant  = 0;            dwWriteLength = sizeof(BITMAPINFOHEADER);            WriteFile( hFile, (PVOID)&bih, dwWriteLength, &dwWrittenLength, NULL );            if( nBpp == 16 ) {                DWORD argbQuad[3] = {0};                if (renderFormat == RENDER_FORMAT_RGB565)                {                    argbQuad[0] = 0x00F800;     // Red mask                    argbQuad[1] = 0x0007E0;     // Green mask                    argbQuad[2] = 0x00001F;     // Blue mask                }                else                {                    argbQuad[0] = 0x007C00;     // Red mask                    argbQuad[1] = 0x0003E0;     // Green mask                    argbQuad[2] = 0x00001F;     // Blue mask                }                dwWriteLength = sizeof(argbQuad);                WriteFile( hFile, (PVOID)&argbQuad[0], dwWriteLength, &dwWrittenLength, NULL );            }            else                if( nBpp == 24 ) {                    DWORD rgbQuad = 0;                    dwWriteLength = sizeof(rgbQuad);                    WriteFile( hFile, (PVOID)&rgbQuad, dwWriteLength, &dwWrittenLength, NULL );                }                else if( nBpp == 32 ) {                    DWORD rgbQuad = 0;                    dwWriteLength = sizeof(rgbQuad);                    WriteFile( hFile, (PVOID)&rgbQuad, dwWriteLength, &dwWrittenLength, NULL );                }                dwWriteLength = dwWB * pSnapshot->height;                WriteFile( hFile, (PVOID)pbuf, dwWriteLength, &dwWrittenLength, NULL );                CloseHandle( hFile );    if (dwWrittenLength < 1)    {        DeleteFile(pSnapshot->filename);    }}else if (image_format == 0x01){    //JPG    int iFilenameLen = (int)strlen(pSnapshot->filename);    if ( (0 != memcmp(pSnapshot->filename+iFilenameLen-3, "jpg", 3)) &&        (0 != memcmp(pSnapshot->filename+iFilenameLen-3, "JPG", 3)) &&        (0 != memcmp(pSnapshot->filename+iFilenameLen-3, "Jpg", 3)) )    {        if (pSnapshot->filename[iFilenameLen-4] == '.')        {            for (int i=iFilenameLen-1; i>0; i--)            {                if (pSnapshot->filename[i] == '.')                {                    pSnapshot->filename[i] = '\0';                    break;                }                else                {                    pSnapshot->filename[i] = '\0';                }            }        }        strcat(pSnapshot->filename, ".jpg");    }    BOOL bres = TRUE;    IJLERR jerr;    DWORD dibPadBytes;    JPEG_CORE_PROPERTIES jcprops;    __try    {        jerr = ijlInit(&jcprops);        if (IJL_OK != jerr)        {            bres = FALSE;            __leave;        }        dibPadBytes = IJL_DIB_PAD_BYTES(dwW, 3);        jcprops.DIBWidth = dwW;        jcprops.DIBHeight = dwH;        jcprops.DIBBytes = (unsigned char*)pbuf;//reinterpret_cast<BYTE *>(&pbi->bmiHeader) + sizeof(BITMAPINFOHEADER);        jcprops.DIBPadBytes = dibPadBytes;        jcprops.DIBChannels = 3;        jcprops.DIBColor = IJL_BGR;        jcprops.JPGFile = const_cast<LPSTR>(pSnapshot->filename);        jcprops.JPGWidth = dwW;        jcprops.JPGHeight = dwH;        jcprops.JPGChannels = 3;        jcprops.JPGColor = IJL_YCBCR;        jcprops.JPGSubsampling = IJL_411;        jcprops.jquality = 95;        jerr = ijlWrite(&jcprops, IJL_JFILE_WRITEWHOLEIMAGE);        if (IJL_OK != jerr)        {            if (IJL_FILE_ERROR == jerr)            {            }            ret = jerr;            bres = FALSE;            if (ret == -23)            {                DeleteFile(pSnapshot->filename);            }        }    }    __finally    {        ijlFree(&jcprops);    }}if (NULL != pDest){    delete []pDest;    pDest = NULL;}return ret;}

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