利用ffmpeg解码h264流的代码
这里也直接给出代码:
h264dec.h:
- #pragma once
- #include "tdll.h"
- #include "avcodec.h"
- #include "postprocess.h"
- //#include "EMVideoCodec.h"
- class h264dec /*: public IH264Decoder*/
- {
- public:
- virtual bool InitH264Deocder(int width,int height);
- virtual bool H264Decode(unsigned char * inbuf, const int & inlen,unsigned char * outbuf,int & outlen);
- virtual void StopH264Decoder();
- virtual void ReleaseConnection();
- public:
- h264dec(void);
- virtual ~h264dec(void);
- private:
- Tdll *dll;
- bool LoadDllFun();
- void (*avcodec_init)(void);
- void (*avcodec_register_all)(void);
- AVCodecContext* (*avcodec_alloc_context)(void);
- AVFrame* (*avcodec_alloc_frame)(void);
- AVCodec *(*avcodec_find_decoder)(enum CodecID id);
- int (*avcodec_decode_video)(AVCodecContext *avctx, AVFrame *picture,int *got_picture_ptr,
- uint8_t *buf, int buf_size);
- int (*avcodec_open)(AVCodecContext *avctx, AVCodec *codec);
- int (*avcodec_close)(AVCodecContext *avctx);
- void (*av_free)(void *ptr);
- bool InitPostproc(int w,int h);
- void ClosePostproc();
- pp_context_t *(*pp_get_context)(int width, int height, int flags);
- void (*pp_free_context)(pp_context_t *ppContext);
- void (*pp_free_mode)(pp_mode_t *mode);
- pp_mode_t *(*pp_get_mode_by_name_and_quality)(char *name, int quality);
- void (*pp_postprocess)(uint8_t * src[3], int srcStride[3],
- uint8_t * dst[3], int dstStride[3],
- int horizontalSize, int verticalSize,
- QP_STORE_T *QP_store, int QP_stride,
- pp_mode_t *mode, pp_context_t *ppContext, int pict_type);
- private:
- AVCodec *pdec;
- AVCodecContext *pdecContext;
- AVFrame *pdecFrame;
- int m_width;
- int m_height;
- Tdll* prodll;
- pp_context_t *pp_context;
- pp_mode_t *pp_mode;
- };
h264dec.cpp:
- #include "StdAfx.h"
- #include ".\h264dec.h"
- h264dec::h264dec(void)
- :dll(NULL)
- ,pdec(NULL)
- ,pdecContext(NULL)
- ,pdecFrame(NULL)
- ,pp_context(NULL)
- ,pp_mode(NULL)
- ,prodll(NULL)
- {
- }
- h264dec::~h264dec(void)
- {
- }
- bool h264dec::LoadDllFun()
- {
- dll=new Tdll(L"libavcodec.dll");
- dll->loadFunction((void**)&avcodec_init,"avcodec_init");
- dll->loadFunction((void**)&avcodec_register_all,"avcodec_register_all");
- dll->loadFunction((void**)&avcodec_alloc_context,"avcodec_alloc_context");
- dll->loadFunction((void**)&avcodec_alloc_frame,"avcodec_alloc_frame");
- dll->loadFunction((void**)&avcodec_find_decoder,"avcodec_find_decoder");
- dll->loadFunction((void**)&avcodec_open,"avcodec_open");
- dll->loadFunction((void**)&avcodec_decode_video,"avcodec_decode_video");
- dll->loadFunction((void**)&avcodec_close,"avcodec_close");
- dll->loadFunction((void**)&av_free,"av_free");
- if (!dll->ok)
- return false;
- prodll = new Tdll(L"postproc.dll");
- prodll->loadFunction((void**)&pp_get_context,"pp_get_context");
- prodll->loadFunction((void**)&pp_free_context,"pp_free_context");
- prodll->loadFunction((void**)&pp_free_mode,"pp_free_mode");
- prodll->loadFunction((void**)&pp_get_mode_by_name_and_quality,"pp_get_mode_by_name_and_quality");
- prodll->loadFunction((void**)&pp_postprocess,"pp_postprocess");
- if(!prodll->ok)
- return false;
- avcodec_init();
- avcodec_register_all();
- return true;
- }
- bool h264dec::InitH264Deocder(int width,int height)
- {
- if(!LoadDllFun())
- return false;
- if(!InitPostproc(width,height))
- return false;
- m_width=width;
- m_height=height;
- pdec = avcodec_find_decoder(CODEC_ID_H264);
- if (pdec == NULL )
- return false;
- pdecContext = avcodec_alloc_context();
- pdecFrame = avcodec_alloc_frame();
- pdecContext->width = width;
- pdecContext->height = height;
- pdecContext->pix_fmt = PIX_FMT_YUV420P;
- /* open it */
- if (avcodec_open(pdecContext, pdec) < 0)
- {
- return false;
- }
- return true;
- }
- bool h264dec::InitPostproc(int w,int h)
- {
- int i_flags = 0;
- i_flags |= PP_CPU_CAPS_MMX | PP_CPU_CAPS_MMX2 | PP_FORMAT_420;
- pp_context = pp_get_context( w, h, i_flags );
- if(!pp_context)
- return false;
- pp_mode = pp_get_mode_by_name_and_quality( "default", 6 );
- if(!pp_mode)
- return false;
- return true;
- }
- bool h264dec::H264Decode(unsigned char * inbuf, const int & inlen,unsigned char * outbuf,int & outlen)
- {
- int got_frame;
- BYTE* showImage[3];
- int showheight[3],showLx[3];
- int len;
- len=avcodec_decode_video(pdecContext, pdecFrame, &got_frame, inbuf, inlen);
- if(len < 0)
- return false;
- if(got_frame)
- {
- showImage[0]=outbuf;
- showImage[1]=showImage[0]+m_width*m_height;
- showImage[2]=showImage[1]+m_width*m_height/4;
- showLx[0]=m_width;showLx[1]=m_width>>1;showLx[2]=m_width>>1;
- showheight[0]=m_height;showheight[1]=m_height>>1;showheight[2]=m_height>>1;
- pp_postprocess(pdecFrame->data,pdecFrame->linesize,showImage,showLx,m_width,m_height,pdecFrame->qscale_table,
- pdecFrame->qstride,pp_mode,pp_context,pdecFrame->pict_type);
- //GetImage( pdecFrame->data,
- // showImage,
- // pdecFrame->linesize,
- // showLx,
- // showheight);
- outlen=m_width*m_height*3/2;
- }
- else
- {
- outlen = 0;
- }
- return true;
- }
- void h264dec::StopH264Decoder()
- {
- if (pdecContext != NULL)
- {
- avcodec_close(pdecContext);
- av_free( pdecContext );
- pdecContext = NULL;
- if(pdecFrame){
- av_free(pdecFrame);
- pdecFrame = NULL;
- }
- }
- if(dll){
- delete dll;
- dll=0;
- }
- ClosePostproc();
- }
- void h264dec::ClosePostproc()
- {
- if(pp_mode){
- pp_free_mode( pp_mode );
- pp_mode=0;
- }
- if(pp_context){
- pp_free_context(pp_context);
- pp_context=0;
- }
- if(prodll){
- delete prodll;
- prodll=0;
- }
- }
- void h264dec::ReleaseConnection()
- {
- delete this;
- }
tdll.h:
- #ifndef _TDLL_
- #define _TDLL_
- class Tdll
- {
- private:
- HMODULE hdll;
- void loadDll(const char *dllName);
- public:
- bool ok;
- Tdll(const TCHAR *dllName1)
- {
- hdll=LoadLibrary(dllName1);
- if (!hdll)
- {
- hdll=NULL;
- }
- ok=(hdll!=NULL);
- };
- ~Tdll()
- {
- if (hdll)
- FreeLibrary(hdll);
- }
- void loadFunction(void **fnc,const char *name)
- {
- *fnc=GetProcAddress(hdll,name);
- ok&=(*fnc!=NULL);
- };
- };
- #endif
main.cpp:
- #include "stdafx.h"
- #include "h264dec.h"
- #include "postprocess.h"
- #define INBUF_SIZE 100 * 1024;
- static int FindStartCode (unsigned char *Buf, int zeros_in_startcode)
- {
- int info;
- int i;
- info = 1;
- for (i = 0; i < zeros_in_startcode; i++)
- {
- if(Buf[i] != 0)
- info = 0;
- }
- if(Buf[i] != 1)
- info = 0;
- return info;
- }
- static bool Check_StartCode(unsigned char *Buf, int pos)
- {
- int info3 = 0;
- info3 = FindStartCode(&Buf[pos-4], 3);
- return info3 == 1;
- }
- static int getNextNal(FILE* inpf, unsigned char* Buf)
- {
- int pos = 0;
- int StartCodeFound = 0;
- int info2 = 0;
- int info3 = 0;
- int nCount = 0;
- while(!feof(inpf) && ++nCount <= 4)
- {
- Buf[pos++]=fgetc(inpf);
- }
- if(!Check_StartCode(Buf, pos))
- {
- return 0;
- }
- while(!feof(inpf) && (Buf[pos++]=fgetc(inpf))==0);
- while (!StartCodeFound)
- {
- if (feof (inpf))
- {
- // return -1;
- return pos-1;
- }
- Buf[pos++] = fgetc (inpf);
- StartCodeFound = Check_StartCode(Buf, pos);
- }
- fseek (inpf, -4, SEEK_CUR);
- return pos - 4;
- }
- int main(int argc, char* argv[])
- {
- if (argc != 5)
- {
- printf("please input: PP_Demo.exe filename1[input] Width Height filename2[output]\n");
- }
- //params set
- unsigned short usWidth = atoi(argv[2]);
- unsigned short usHeight = atoi(argv[3]);
- //create dec&pp
- h264dec *pdec = new h264dec;
- if(!pdec->InitH264Deocder(usWidth, usHeight))
- {
- return false;
- }
- unsigned char *p_In_Frame = new unsigned char[usWidth * usHeight * 3/2];
- unsigned char *p_Out_Frame = new unsigned char[usWidth * usHeight * 3/2];
- FILE* ifp = fopen(argv[1],"rb");
- FILE* ofp = fopen(argv[4],"wb");
- bool b_continue = true;
- int nReadUnit = usWidth * usHeight * 3/2;
- while(!feof(ifp))
- {
- int nCount = getNextNal(ifp, p_In_Frame);
- if(nCount == 0)
- {
- continue;
- }
- unsigned char *ptr = p_In_Frame;
- int n_Outlen = 0;
- pdec->H264Decode(ptr, nCount, p_Out_Frame, n_Outlen);
- if(n_Outlen > 0)
- {
- fwrite(p_Out_Frame, 1, n_Outlen, ofp);
- }
- }
- //realse
- delete []p_In_Frame;
- delete []p_Out_Frame;
- pdec->StopH264Decoder();
- pdec->ReleaseConnection();
- fclose(ifp);
- fclose(ofp);
- return 0;
- }
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