main.~pas

xvid库调用来压缩视频编码实例

unit main;

interface

uses   
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DSUtil, StdCtrls, DSPack, DirectShow9, Menus, ExtCtrls,lib_xvid;

type
  TVideoForm = class(TForm)
    FilterGraph: TFilterGraph;
    VideoWindow: TVideoWindow;
    MainMenu1: TMainMenu;
    Devices: TMenuItem;
    Filter: TFilter;
    Image: TImage;
    SampleGrabber: TSampleGrabber;
    SnapShot: TButton;
    CallBack: TCheckBox;
    mmo1: TMemo;
    lbl1: TLabel;
    procedure FormCreate(Sender: TObject);
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
    procedure SnapShotClick(Sender: TObject);
    procedure SampleGrabberBuffer(sender: TObject; SampleTime: Double;
      pBuffer: Pointer; BufferLen: Integer);
  private
    // XVID ENCODER
    xvid_gbl: xvid_gbl_init_t;
    xvid_enc     : xvid_enc_create_t;
    xvid_encFrame: xvid_enc_frame_t;
    xvid_encStats: xvid_enc_stats_t;

    xVid_decode  : xvid_dec_create_t;
    xvid_decFrame: xvid_dec_frame_t;
    xvid_decStats: xvid_dec_stats_t;    
  public
    procedure OnSelectDevice(sender: TObject);
  end;

const
   MaxPixelCount = 65536;
type
   //Pf24bit真彩色位图像素数据结构体
   pRGBTripleArray = ^TRGBTripleArray;
   TRGBTripleArray = array[0..MaxPixelCount - 1] of TRGBTriple;
var
  VideoForm: TVideoForm;
  SysDev: TSysDevEnum;
  FrameBuf:array [0..352*288*3 ] of Byte;
  FrameImg:array [0..352*288*3 ] of Byte;
  FrameSequece : LongWord= 0;
  spf:TFileStream;
  xvid_Version:Integer;
implementation

{$R *.dfm}

procedure TVideoForm.FormCreate(Sender: TObject);
var
  i: integer;
  Device: TMenuItem;
begin
  xvid_Version :=XVID_MAKE_VERSION(1,1,0);
  SysDev:= TSysDevEnum.Create(CLSID_VideoInputDeviceCategory);
  if SysDev.CountFilters > 0 then
    for i := 0 to SysDev.CountFilters - 1 do
    begin
      Device := TMenuItem.Create(Devices);
      Device.Caption := SysDev.Filters[i].FriendlyName;
      Device.Tag := i;
      Device.OnClick := OnSelectDevice;
      Devices.Add(Device);
    end;
end;

procedure TVideoForm.OnSelectDevice(sender: TObject);
begin
  FilterGraph.ClearGraph;
  FilterGraph.Active := false;
  Filter.BaseFilter.Moniker := SysDev.GetMoniker(TMenuItem(Sender).tag);
  FilterGraph.Active := true;
  with FilterGraph as ICaptureGraphBuilder2 do
  begin
    RenderStream(@PIN_CATEGORY_PREVIEW, nil, Filter as IBaseFilter, SampleGrabber as IBaseFilter, VideoWindow as IbaseFilter);
  end;
  try
      //XVID库初始化操作
      xvid_gbl.version := xvid_Version;    //Version:1.1.0
      xvid_gbl.cpu_flags := 0; //Word(XVID_CPU_FORCE or XVID_CPU_ASM);//0:自动检查CPU，XVID_CPU_FORCE：强制使用ASM汇编优化
      xvid_gbl.debug := 0;     //调试级别

      //初始化编解码
      xvid_global(nil, XVID_GBL_INIT, @xvid_gbl, nil);

      // XVID编码器初始化
      xvid_enc.version := xvid_Version;
      //编码器参数
      xvid_enc.global := XVID_GLOBAL_PACKED;   //全局标志
      xvid_enc.width := 320;  //压缩视频宽度
      xvid_enc.height := 240; //压缩视频高度
      xvid_enc.fbase := 3;    //基本帧率/每秒  = fbase * 10 = 30
      xvid_enc.fincr := 1;    //帧率增长步长，0：可变步长，>1实际增长步长
      xvid_enc.profile := XVID_PROFILE_AS_L4; //压缩级别，MPEG4-ASP最高压缩级别
      xvid_enc.max_key_interval := 0;  //最大关键帧间隔
      xvid_enc.frame_drop_ratio := 0;  //丢帧率；0~100
      xvid_enc.max_bframes := 0; //是否采用B帧，一般采用I，P帧，如果1=PB帧
      xvid_enc.bquant_offset := 0;
      xvid_enc.bquant_ratio := 0;

      //创建编码器
      xvid_encore(nil, XVID_ENC_CREATE, @xvid_enc, nil);
      //初始化压缩数据帧结构
      xvid_encFrame.version := xvid_Version;
      // --- VOL FLAGS
      xvid_encFrame.vol_flags := 0;
      xvid_encFrame.vol_flags := xvid_encFrame.vol_flags or XVID_VOL_MPEGQUANT OR XVID_VOL_QUARTERPEL OR XVID_VOL_GMC;
      //xvid_encFrame.vol_flags := xvid_encFrame.vol_flags OR XVID_VOL_MPEGQUANT;  //允许MPEG量化
      //xvid_encFrame.vol_flags := xvid_encFrame.vol_flags OR XVID_VOL_GMC;        //允许GMC
      //xvid_encFrame.vol_flags := xvid_encFrame.vol_flags OR XVID_VOL_QUARTERPEL; //采用1/4像素运算
      // --- VOP FLAGS
      xvid_encFrame.vop_flags := 0;
      xvid_encFrame.vop_flags := xvid_encFrame.vop_flags or XVID_VOP_CHROMAOPT ;
      xvid_encFrame.motion := 0;  //运动标识
      xvid_encFrame.quant := 0; //质量控制=量化参数，0~31，数值越小质量越高

      xvid_encFrame.coding_type := XVID_TYPE_AUTO;  //XVID_TYPE_AUTO=让编码器自动决定，I帧编码是关键帧，P帧编码是帧内预测

      //图像压缩编码
      xvid_encStats.version := xvid_Version;

      // XVID解码器初始化
      xVid_decode.version := xvid_Version;
      xVid_decode.width := 320;
      xVid_decode.height := 240;

      //创建解码器
      xvid_decore(xVid_decode.handle,XVID_DEC_CREATE,@xVid_decode, nil);

      spf := TFileStream.Create('c:\test.mp4',fmCreate or fmOpenReadWrite);
  except
    Exit;
  end;
  FilterGraph.Play;
end;

procedure TVideoForm.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
  CallBack.Checked := False;
  SysDev.Free;
  FilterGraph.ClearGraph;
  FilterGraph.Active := false;
  //关闭编解码器
  xvid_encore(xvid_enc.handle,XVID_ENC_DESTROY, @xvid_enc, nil);
  xvid_decore(xVid_decode.handle,XVID_DEC_DESTROY,@xvid_decode,nil);
end;

procedure TVideoForm.SnapShotClick(Sender: TObject);
begin
  SampleGrabber.GetBitmap(Image.Picture.Bitmap);
end;

procedure TVideoForm.SampleGrabberBuffer(sender: TObject;
  SampleTime: Double; pBuffer: Pointer; BufferLen: Integer);
var
  SpBmp:TBitmap;
  BmpLineData:prgbtriplearray;
  yCount,uCount,vCount:Integer;
  Row,Col:Integer;
  Ret:Integer;
begin
  if CallBack.Checked then
  begin
    try
      xvid_encFrame.bitstream := @FrameBuf[0];
      xvid_encFrame.length := BufferLen;
      xvid_encFrame.input.csp := XVID_CSP_BGR; //输入是rgb位图
      xvid_encFrame.input.plane[0] := pBuffer; //RGB位图数据，每个像素有3个字节
      xvid_encFrame.input.stride[0] := 320 * 3; //每行字节数

      //开始压缩
      //Ret := xvid_encore(xvid_enc.handle, XVID_ENC_ENCODE, @xvid_encFrame,@xvid_encStats); //返回编码之后的字节
      Ret := xvid_encore(xvid_enc.handle, XVID_ENC_ENCODE, @xvid_encFrame,nil); //返回编码之后的字节
      spf.Write(FrameBuf,Ret);
      mmo1.Lines.Add('Codec_num=' + IntToStr(FrameSequece) + ' Len=' + IntToStr(Ret));
      Inc(FrameSequece);


      //实时解码部分
      if Ret > 0 then
      begin
        try
            SpBmp := TBitmap.Create;
            SpBmp.PixelFormat := pf24bit;

            //初始化解码数据帧结构
            xvid_decFrame.version := xvid_Version;
            xvid_decFrame.general := 0;
            xvid_decFrame.bitstream := @FrameBuf[0];   //输入解压的位流
            xvid_decFrame.length := Ret;               //输入位流长度
            xvid_decFrame.output.csp := XVID_CSP_I420; //色彩空间
            xvid_decFrame.output.plane[0] := @FrameImg[0];   //解压后输出的缓冲区
            xvid_decFrame.output.stride[0] := 320 * 3;           //每行字节数
            ret := xvid_decore(xVid_decode.handle , XVID_DEC_DECODE, @xvid_decFrame, nil);
            if ret > 0 then
            begin
               //SampleGrabber.GetBitmap(SpBmp, @FrameImg, ret); //捕获原始bmp位图
               //Image.Canvas.Draw(0,0,SpBmp);
               mmo1.Lines.Add('decode_num=' + IntToStr(FrameSequece) + ' Len=' + IntToStr(Ret));
            end;
        finally
          SpBmp.Free;
        end;
      end else begin

      end;
       
    except

    end;
  end;
end;

end.