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news 2025/8/14 22:34:23
网站空间关闭了怎么办,在线网页制作工具,企业网站的主要栏目,天峻县公司网站建设注：写了一系列的有关ffdshow对解码器的封装的代码，列表如下：ffdshow 源代码分析 6： 对解码器的dll的封装（libavcodec）ffdshow 源代码分析 7： libavcodec视频解码器类（TvideoCodecLib…

注：写了一系列的有关ffdshow对解码器的封装的代码，列表如下：
ffdshow 源代码分析 6： 对解码器的dll的封装（libavcodec）
ffdshow 源代码分析 7： libavcodec视频解码器类（TvideoCodecLibavcodec）
ffdshow 源代码分析 8： 视频解码器类（TvideoCodecDec）
ffdshow 源代码分析 9： 编解码器有关类的总结

==========

ffdshow封装了多个视音频解码器，比如libmpeg2，libavcodec，xvid等等。其中最重要的是libavcodec，这个是ffmpeg提供的解码器，在ffdshow中起到了“挑大梁”的作用。本文分析ffdshow对解码器的封装方式，就以libavcodec为例。

 

在ffdshow中，libavcodec的被封装在ffmpeg.dll文件中，通过加载该dll中的函数，就可以使用libavcodec的各种方法。

 

Ffmpeg对libavcodec的封装类的定义位于codecs->libavcodec->Tlibavcodec.h。实现则位于codecs->libavcodec->Tlibavcodec.cpp。

先来看一看Tlibavcodec.h：

 

/* *雷霄骅 *leixiaohua1020@126.com *中国传媒大学/数字电视技术 */ 
#ifndef _TLIBAVCODEC_H_
#define _TLIBAVCODEC_H_
//将FFmpeg的Dll中的方法封装到一个类中，以供使用
#include "../codecs/ffcodecs.h"
#include <dxva.h>
#include "TpostprocSettings.h"
#include "ffImgfmt.h"
#include "libavfilter/vf_yadif.h"
#include "libavfilter/gradfun.h"
#include "libswscale/swscale.h"struct AVCodecContext;
struct AVCodec;
struct AVFrame;
struct AVPacket;
struct AVCodecParserContext;
struct SwsContext;
struct SwsParams;
struct PPMode;
struct AVDictionary;struct Tconfig;
class Tdll;
struct DSPContext;
struct TlibavcodecExt;
//封装FFMPEG
//里面的函数基本上是FFMPEG的API
struct Tlibavcodec {
private:int (*libswscale_sws_scale)(struct SwsContext *context, const uint8_t* const srcSlice[], const int srcStride[],int srcSliceY, int srcSliceH, uint8_t* const dst[], const int dstStride[]);//加载DLL的类Tdll *dll;int refcount;static int get_buffer(AVCodecContext *c, AVFrame *pic);CCritSec csOpenClose;
public:Tlibavcodec(const Tconfig *config);~Tlibavcodec();static void avlog(AVCodecContext*, int, const char*, va_list);static void avlogMsgBox(AVCodecContext*, int, const char*, va_list);void AddRef(void) {refcount++;}void Release(void) {if (--refcount < 0) {delete this;}}static bool getVersion(const Tconfig *config, ffstring &vers, ffstring &license);static bool check(const Tconfig *config);static int ppCpuCaps(uint64_t csp);static void pp_mode_defaults(PPMode &ppMode);static int getPPmode(const TpostprocSettings *cfg, int currentq);static void swsInitParams(SwsParams *params, int resizeMethod);static void swsInitParams(SwsParams *params, int resizeMethod, int flags);bool ok;AVCodecContext* avcodec_alloc_context(AVCodec *codec, TlibavcodecExt *ext = NULL);void (*avcodec_register_all)(void);AVCodecContext* (*avcodec_alloc_context0)(AVCodec *codec);AVCodec* (*avcodec_find_decoder)(AVCodecID codecId);AVCodec* (*avcodec_find_encoder)(AVCodecID id);int (*avcodec_open0)(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);int  avcodec_open(AVCodecContext *avctx, AVCodec *codec);AVFrame* (*avcodec_alloc_frame)(void);int (*avcodec_decode_video2)(AVCodecContext *avctx, AVFrame *picture,int *got_picture_ptr,AVPacket *avpkt);int (*avcodec_decode_audio3)(AVCodecContext *avctx, int16_t *samples,int *frame_size_ptr,AVPacket *avpkt);int (*avcodec_encode_video)(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVFrame *pict);int (*avcodec_encode_audio)(AVCodecContext *avctx, uint8_t *buf, int buf_size, const short *samples);void (*avcodec_flush_buffers)(AVCodecContext *avctx);int (*avcodec_close0)(AVCodecContext *avctx);int  avcodec_close(AVCodecContext *avctx);void (*av_log_set_callback)(void (*)(AVCodecContext*, int, const char*, va_list));void* (*av_log_get_callback)(void);int (*av_log_get_level)(void);void (*av_log_set_level)(int);void (*av_set_cpu_flags_mask)(int mask);int (*avcodec_default_get_buffer)(AVCodecContext *s, AVFrame *pic);void (*avcodec_default_release_buffer)(AVCodecContext *s, AVFrame *pic);int (*avcodec_default_reget_buffer)(AVCodecContext *s, AVFrame *pic);const char* (*avcodec_get_current_idct)(AVCodecContext *avctx);void (*avcodec_get_encoder_info)(AVCodecContext *avctx, int *xvid_build, int *divx_version, int *divx_build, int *lavc_build);void* (*av_mallocz)(size_t size);void (*av_free)(void *ptr);AVCodecParserContext* (*av_parser_init)(int codec_id);int (*av_parser_parse2)(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos);void (*av_parser_close)(AVCodecParserContext *s);void (*av_init_packet)(AVPacket *pkt);uint8_t* (*av_packet_new_side_data)(AVPacket *pkt, enum AVPacketSideDataType type, int size);int (*avcodec_h264_search_recovery_point)(AVCodecContext *avctx,const uint8_t *buf, int buf_size, int *recovery_frame_cnt);static const char_t *idctNames[], *errorRecognitions[], *errorConcealments[];struct Tdia_size {int size;const char_t *descr;};static const Tdia_size dia_sizes[];//libswscale importsSwsContext* (*sws_getCachedContext)(struct SwsContext *context, int srcW, int srcH, enum PixelFormat srcFormat,int dstW, int dstH, enum PixelFormat dstFormat, int flags,SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param, SwsParams *ffdshow_params);void (*sws_freeContext)(SwsContext *c);SwsFilter* (*sws_getDefaultFilter)(float lumaGBlur, float chromaGBlur,float lumaSharpen, float chromaSharpen,float chromaHShift, float chromaVShift,int verbose);void (*sws_freeFilter)(SwsFilter *filter);int sws_scale(struct SwsContext *context, const uint8_t* const srcSlice[], const stride_t srcStride[],int srcSliceY, int srcSliceH, uint8_t* const dst[], const stride_t dstStride[]);SwsVector *(*sws_getConstVec)(double c, int length);SwsVector *(*sws_getGaussianVec)(double variance, double quality);void (*sws_normalizeVec)(SwsVector *a, double height);void (*sws_freeVec)(SwsVector *a);int (*sws_setColorspaceDetails)(struct SwsContext *c, const int inv_table[4],int srcRange, const int table[4], int dstRange,int brightness, int contrast, int saturation);const int* (*sws_getCoefficients)(int colorspace);int (*GetCPUCount)(void);//libpostproc importsvoid (*pp_postprocess)(const uint8_t * src[3], const stride_t srcStride[3],uint8_t * dst[3], const stride_t dstStride[3],int horizontalSize, int verticalSize,const /*QP_STORE_T*/int8_t *QP_store,  int QP_stride,/*pp_mode*/void *mode, /*pp_context*/void *ppContext, int pict_type);/*pp_context*/void *(*pp_get_context)(int width, int height, int flags);void (*pp_free_context)(/*pp_context*/void *ppContext);void (*ff_simple_idct_mmx)(int16_t *block);// DXVA importsint (*av_h264_decode_frame)(struct AVCodecContext* avctx, uint8_t *buf, int buf_size);int (*av_vc1_decode_frame)(struct AVCodecContext* avctx, uint8_t *buf, int buf_size);// === H264 functionsint (*FFH264CheckCompatibility)(int nWidth, int nHeight, struct AVCodecContext* pAVCtx, BYTE* pBuffer, UINT nSize, int nPCIVendor, int nPCIDevice, LARGE_INTEGER VideoDriverVersion);int (*FFH264DecodeBuffer)(struct AVCodecContext* pAVCtx, BYTE* pBuffer, UINT nSize, int* pFramePOC, int* pOutPOC, REFERENCE_TIME* pOutrtStart);HRESULT(*FFH264BuildPicParams)(DXVA_PicParams_H264* pDXVAPicParams, DXVA_Qmatrix_H264* pDXVAScalingMatrix, int* nFieldType, int* nSliceType, struct AVCodecContext* pAVCtx, int nPCIVendor);void (*FFH264SetCurrentPicture)(int nIndex, DXVA_PicParams_H264* pDXVAPicParams, struct AVCodecContext* pAVCtx);void (*FFH264UpdateRefFramesList)(DXVA_PicParams_H264* pDXVAPicParams, struct AVCodecContext* pAVCtx);BOOL (*FFH264IsRefFrameInUse)(int nFrameNum, struct AVCodecContext* pAVCtx);void (*FF264UpdateRefFrameSliceLong)(DXVA_PicParams_H264* pDXVAPicParams, DXVA_Slice_H264_Long* pSlice, struct AVCodecContext* pAVCtx);void (*FFH264SetDxvaSliceLong)(struct AVCodecContext* pAVCtx, void* pSliceLong);// === VC1 functionsHRESULT(*FFVC1UpdatePictureParam)(DXVA_PictureParameters* pPicParams, struct AVCodecContext* pAVCtx, int* nFieldType, int* nSliceType, BYTE* pBuffer, UINT nSize, UINT* nFrameSize, BOOL b_SecondField, BOOL* b_repeat_pict);int (*FFIsSkipped)(struct AVCodecContext* pAVCtx);// === Common functionschar*    (*GetFFMpegPictureType)(int nType);unsigned long(*FFGetMBNumber)(struct AVCodecContext* pAVCtx);// yadifvoid (*yadif_init)(YADIFContext *yadctx);void (*yadif_uninit)(YADIFContext *yadctx);void (*yadif_filter)(YADIFContext *yadctx, uint8_t *dst[3], stride_t dst_stride[3], int width, int height, int parity, int tff);// gradfunint (*gradfunInit)(GradFunContext *ctx, const char *args, void *opaque);void (*gradfunFilter)(GradFunContext *ctx, uint8_t *dst, uint8_t *src, int width, int height, int dst_linesize, int src_linesize, int r);
};#endif

 

 

从Tlibavcodec定义可以看出，里面包含了大量的ffmpeg中的API，占据了很大的篇幅。通过调用这些API，就可以使用livavcodec的各种功能。

在Tlibavcodec的定义中，有一个变量：Tdll *dll，通过该变量，就可以加载ffmpeg.dll中的方法。

先来看一下Tdll的定义：

 

/* *雷霄骅 *leixiaohua1020@126.com *中国传媒大学/数字电视技术 */ #ifndef _TDLL_H_
#define _TDLL_H_#include "Tconfig.h"
//操作Dll的类
class Tdll
{
public:bool ok;Tdll(const char_t *dllName1, const Tconfig *config, bool explicitFullPath = false) {char_t name[MAX_PATH], ext[MAX_PATH];_splitpath_s(dllName1, NULL, 0, NULL, 0, name, countof(name), ext, countof(ext));if (config && !explicitFullPath) {char_t dllName2[MAX_PATH]; //installdir+filename+ext_makepath_s(dllName2, countof(dllName2), NULL, config->pth, name, ext);hdll = LoadLibrary(dllName2);} else {hdll = NULL;}if (!hdll) {hdll = LoadLibrary(dllName1);if (!hdll && !explicitFullPath) {if (config) {char_t dllName3[MAX_PATH]; //ffdshow.ax_path+filename+ext_makepath_s(dllName3, countof(dllName3), NULL, config->epth, name, ext);hdll = LoadLibrary(dllName3);}if (!hdll) {char_t dllName0[MAX_PATH]; //only filename+ext - let Windows find it_makepath_s(dllName0, countof(dllName0), NULL, NULL, name, ext);hdll = LoadLibrary(dllName0);}}}ok = (hdll != NULL);}~Tdll() {if (hdll) {FreeLibrary(hdll);}}HMODULE hdll;//封装一下直接加载Dll的GetProcAddresstemplate<class T> __forceinline void loadFunction(T &fnc, const char *name) {fnc = hdll ? (T)GetProcAddress(hdll, name) : NULL;ok &= (fnc != NULL);}template<class T> __forceinline void loadFunctionByIndex(T &fnc, uint16_t id) {uint32_t id32 = uint32_t(id);fnc = hdll ?(T) GetProcAddress(hdll, (LPCSTR)id32) :NULL;ok &= (fnc != NULL);}//检查Dll的状态是否正常static bool check(const char_t *dllName1, const Tconfig *config) {char_t name[MAX_PATH], ext[MAX_PATH];_splitpath_s(dllName1, NULL, 0, NULL, 0, name, countof(name), ext, countof(ext));if (config) {char_t dllName2[MAX_PATH]; //installdir+filename+ext_makepath_s(dllName2, countof(dllName2), NULL, config->pth, name, ext);if (fileexists(dllName2)) {return true;}}if (fileexists(dllName1)) {return true;}if (config) {char_t dllName3[MAX_PATH]; //ffdshow.ax_path+filename+ext_makepath_s(dllName3, MAX_PATH, NULL, config->epth, name, ext);if (fileexists(dllName3)) {return true;}}char_t dllName0[MAX_PATH]; //only filename+ext - let Windows find it_makepath_s(dllName0, countof(dllName0), NULL, NULL, name, ext);char_t dir0[MAX_PATH], *dir0flnm;if (SearchPath(NULL, dllName0, NULL, MAX_PATH, dir0, &dir0flnm)) {return true;}return false;}
};#endif

 

 

从Tdll的定义可以看出，该类的loadFunction()函数封装了系统使用Dll功能的函数GetProcAddress()。

该类的构造函数Tdll()封装了系统加载Dll的函数LoadLibrary()。

此外该类还提供了check()用于检查Dll。

对于Tdll的分析先告一段落，现在我们回到Tlibavcodec，来看看它是如何加载libavcodec的函数的。查看一下Tlibavcodec的类的实现，位于codecs->libavcodec->Tlibavcodec.cpp。

该类的实现代码比较长，因此只能选择重要的函数查看一下。首先来看一下构造函数：

//===================================== Tlibavcodec ====================================
//FFMPEG封装类的构造函数
Tlibavcodec::Tlibavcodec(const Tconfig *config): refcount(0)
{//加载FFMPEG的Dlldll = new Tdll(_l("ffmpeg.dll"), config);//加载各个函数dll->loadFunction(avcodec_register_all, "avcodec_register_all");dll->loadFunction(avcodec_find_decoder, "avcodec_find_decoder");dll->loadFunction(avcodec_open0, "avcodec_open2");dll->loadFunction(avcodec_alloc_context0, "avcodec_alloc_context3");dll->loadFunction(avcodec_alloc_frame, "avcodec_alloc_frame");dll->loadFunction(avcodec_decode_video2, "avcodec_decode_video2");dll->loadFunction(avcodec_flush_buffers, "avcodec_flush_buffers");dll->loadFunction(avcodec_close0, "avcodec_close");dll->loadFunction(av_log_set_callback, "av_log_set_callback");dll->loadFunction(av_log_get_callback, "av_log_get_callback");dll->loadFunction(av_log_get_level, "av_log_get_level");dll->loadFunction(av_log_set_level, "av_log_set_level");dll->loadFunction(av_set_cpu_flags_mask, "av_set_cpu_flags_mask");dll->loadFunction(av_mallocz, "av_mallocz");dll->loadFunction(av_free, "av_free");dll->loadFunction(avcodec_default_get_buffer, "avcodec_default_get_buffer");dll->loadFunction(avcodec_default_release_buffer, "avcodec_default_release_buffer");dll->loadFunction(avcodec_default_reget_buffer, "avcodec_default_reget_buffer");dll->loadFunction(avcodec_get_current_idct, "avcodec_get_current_idct");dll->loadFunction(avcodec_get_encoder_info, "avcodec_get_encoder_info");dll->loadFunction(av_init_packet, "av_init_packet");dll->loadFunction(av_packet_new_side_data, "av_packet_new_side_data");dll->loadFunction(avcodec_h264_search_recovery_point, "avcodec_h264_search_recovery_point");dll->loadFunction(avcodec_decode_audio3, "avcodec_decode_audio3");dll->loadFunction(avcodec_find_encoder, "avcodec_find_encoder");dll->loadFunction(avcodec_encode_video, "avcodec_encode_video");dll->loadFunction(avcodec_encode_audio, "avcodec_encode_audio");dll->loadFunction(av_parser_init, "av_parser_init");dll->loadFunction(av_parser_parse2, "av_parser_parse2");dll->loadFunction(av_parser_close, "av_parser_close");//libswscale methodsdll->loadFunction(sws_getCachedContext, "sws_getCachedContext");dll->loadFunction(sws_freeContext, "sws_freeContext");dll->loadFunction(sws_getDefaultFilter, "sws_getDefaultFilter");dll->loadFunction(sws_freeFilter, "sws_freeFilter");dll->loadFunction(libswscale_sws_scale, "sws_scale");dll->loadFunction(GetCPUCount, "GetCPUCount");dll->loadFunction(sws_getConstVec, "sws_getConstVec");dll->loadFunction(sws_getGaussianVec, "sws_getGaussianVec");dll->loadFunction(sws_normalizeVec, "sws_normalizeVec");dll->loadFunction(sws_freeVec, "sws_freeVec");dll->loadFunction(sws_setColorspaceDetails, "sws_setColorspaceDetails");dll->loadFunction(sws_getCoefficients, "sws_getCoefficients");//libpostproc methodsdll->loadFunction(pp_postprocess, "pp_postprocess");dll->loadFunction(pp_get_context, "pp_get_context");dll->loadFunction(pp_free_context, "pp_free_context");dll->loadFunction(ff_simple_idct_mmx, "ff_simple_idct_mmx");//DXVA methodsdll->loadFunction(av_h264_decode_frame, "av_h264_decode_frame");dll->loadFunction(av_vc1_decode_frame, "av_vc1_decode_frame");dll->loadFunction(FFH264CheckCompatibility, "FFH264CheckCompatibility");dll->loadFunction(FFH264DecodeBuffer, "FFH264DecodeBuffer");dll->loadFunction(FFH264BuildPicParams, "FFH264BuildPicParams");dll->loadFunction(FFH264SetCurrentPicture, "FFH264SetCurrentPicture");dll->loadFunction(FFH264UpdateRefFramesList, "FFH264UpdateRefFramesList");dll->loadFunction(FFH264IsRefFrameInUse, "FFH264IsRefFrameInUse");dll->loadFunction(FF264UpdateRefFrameSliceLong, "FF264UpdateRefFrameSliceLong");dll->loadFunction(FFH264SetDxvaSliceLong, "FFH264SetDxvaSliceLong");dll->loadFunction(FFVC1UpdatePictureParam, "FFVC1UpdatePictureParam");dll->loadFunction(FFIsSkipped, "FFIsSkipped");dll->loadFunction(GetFFMpegPictureType, "GetFFMpegPictureType");dll->loadFunction(FFGetMBNumber, "FFGetMBNumber");//yadif methodsdll->loadFunction(yadif_init, "yadif_init");dll->loadFunction(yadif_uninit, "yadif_uninit");dll->loadFunction(yadif_filter, "yadif_filter");//gradfundll->loadFunction(gradfunInit, "gradfunInit");dll->loadFunction(gradfunFilter, "gradfunFilter");ok = dll->ok;//加载完毕后，进行注册if (ok) {avcodec_register_all();av_log_set_callback(avlog);}
}

 

该构造函数尽管篇幅比较长，但是还是比较好理解的，主要完成了3步：

1.创建一个Tdll类的对象，加载“ffmpeg.dll”。

2.使用loadFunction()加载各种函数。

3.最后调用avcodec_register_all()注册各种解码器。

 

Tlibavcodec的析构函数则比较简单：

Tlibavcodec::~Tlibavcodec()
{delete dll;
}

 

检查Dll的函数也比较简单：

bool Tlibavcodec::check(const Tconfig *config)
{return Tdll::check(_l("ffmpeg.dll"), config);
}

 

此外，可能是出于某些功能的考虑，ffdshow还自己写了几个函数，但是限于篇幅不能一一介绍，在这里只介绍一个：

获取libavcodec版本：

bool Tlibavcodec::getVersion(const Tconfig *config, ffstring &vers, ffstring &license)
{Tdll *dl = new Tdll(_l("ffmpeg.dll"), config);void (*av_getVersion)(char **version, char **build, char **datetime, const char* *license);dl->loadFunction(av_getVersion, "getVersion");bool res;if (av_getVersion) {res = true;char *version, *build, *datetime;const char *lic;av_getVersion(&version, &build, &datetime, &lic);vers = (const char_t*)text<char_t>(version) + ffstring(_l(" (")) + (const char_t*)text<char_t>(datetime) + _l(")");license = text<char_t>(lic);} else {res = false;vers.clear();license.clear();}delete dl;return res;
}




 

 

 


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