/*
*最簡單的音頻轉碼器（只處理音頻）
*繆國凱?Mickel
*821486004@qq.com
*本程序實現從一個視頻格式轉碼到另一個視頻格式，只處理音頻，視頻忽略，若有多個音頻流，只處理第一個采用swr_convert重取樣
*2015-5-8
*/


#include?“stdafx.h“

#ifdef?__cplusplus
extern“C“
{
#endif
#include?
#include?“libavcodec/avcodec.h“
#include?“libavfilter/avfiltergraph.h“
#include?“libavfilter/buffersink.h“
#include?“libavfilter/buffersrc.h“
#include?“libavutil/avutil.h“
#include?“libavutil/opt.h“
#include?“libavutil/pixdesc.h“
#include?“libswresample\swresample.h“
#include?“libavutil\fifo.h“
#include?
#include?

#pragma?comment（lib?“avcodec.lib“）
#pragma?comment（lib?“avformat.lib“）
#pragma?comment（lib?“avutil.lib“）
	//#pragma?comment（lib?“avdevice.lib“）
#pragma?comment（lib?“avfilter.lib“）
	//#pragma?comment（lib?“postproc.lib“）
#pragma?comment（lib?“swresample.lib“）
	//#pragma?comment（lib?“swscale.lib“）
#ifdef?__cplusplus
};
#endif

#define?__STDC_CONSTANT_MACROS

#ifdef?_WIN32
//Windows
extern?“C“
{
#include?“libavcodec/avcodec.h“
#include?“libavformat/avformat.h“
#include?“libswscale/swscale.h“
//#include?“SDL.h“
};
#else
//Linux...
#ifdef?__cplusplus
extern?“C“
{
#endif
#include?
#include?
#include?
#include?
#ifdef?__cplusplus
};
#endif
#endif

#define?MAX_PATH?128
#include?“stdio.h“
/**
*?將AVframe（YUV420格式）保存為JPEG格式的圖片
*
*?@param?width?YUV420的寬
*?@param?height?YUV42的高
*
*/
int?MyWriteJPEG（AVframe*?pframe?int?width?int?height?int?iIndex）
{
	//?輸出文件路徑
	char?out_file[MAX_PATH]?=?{0};


	//???sprintf_s（out_file?sizeof（out_file）?“./%d.jpg“??iIndex）;

	sprintf（out_file“./tupian/%d.jpg“iIndex）;

	//?分配AVFormatContext對象
	AVFormatContext*?pFormatCtx?=?avformat_alloc_context（）;

	//?設置輸出文件格式
	pFormatCtx->oformat?=?av_guess_format（“mjpeg“?NULL?NULL）;

	//?創建并初始化一個和該url相關的AVIOContext
	if（?avio_open（&pFormatCtx->pb?out_file?AVIO_FLAG_READ_WRITE）?	{
		printf（“Couldn‘t?open?output?file.“）;
		return?-1;
	}


	//?構建一個新stream
	AVStream*?pAVStream?=?avformat_new_stream（pFormatCtx?0）;
	if（?pAVStream?==?NULL?）
	{
		return?-1;
	}


	//?設置該stream的信息
	AVCodecContext*?pCodecCtx?=?pAVStream->codec;

	pCodecCtx->codec_id?=?pFormatCtx->oformat->video_codec;
	pCodecCtx->codec_type?=?AVMEDIA_TYPE_VIDEO;
	pCodecCtx->pix_fmt?=?PIX_FMT_YUVJ420P;
	pCodecCtx->width?=?width;
	pCodecCtx->height?=?height;
	pCodecCtx->time_base.num?=?1;
	pCodecCtx->time_base.den?=?25;

	//?Begin?Output?some?information
	av_dump_format（pFormatCtx?0?out_file?1）;
	//?End?Output?some?information


	//?查找解碼器
	AVCodec*?pCodec?=?avcodec_find_encoder（pCodecCtx->codec_id）;
	if（?!pCodec?）
	{
		printf（“Codec?not?found.“）;
		return?-1;
	}
	//?設置pCodecCtx的解碼器為pCodec
	if（?avcodec_open2（pCodecCtx?pCodec?NULL）?	{
		printf（“Could?not?open?codec.“）;
		return?-1;
	}


	//Write?Header
	avformat_write_header（pFormatCtx?N

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????2686976??2018-03-22?11:23??Mp4ToJPG\ipch\mp4tojpg-568c8c52\mp4tojpg-c11bbb81.ipch

?????文件????2686976??2018-03-21?15:40??Mp4ToJPG\ipch\transcodingaudiouseswrcontext-78e17787\transcodingaudiouseswrcontext-8be9c8c8.ipch

?????文件????2162688??2017-08-15?17:29??Mp4ToJPG\ipch\transcodingaudiouseswrcontext-b668ddf6\transcodingaudiouseswrcontext-8be9c8c8.ipch

?????文件????2686976??2017-08-15?17:32??Mp4ToJPG\ipch\transcodingaudiouseswrcontext-fec6938e\transcodingaudiouseswrcontext-8be9c8c8.ipch

?????文件???18936320??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\avcodec-55.dll

?????文件????1340928??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\avdevice-55.dll

?????文件????2034688??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\avfilter-4.dll

?????文件????5342720??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\avformat-55.dll

?????文件?????418304??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\avutil-52.dll

?????文件???????8908??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\befor_swr.txt

?????文件????1709108??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\cuc_ieschool.ts

?????文件???????1222??2018-03-22?11:25??Mp4ToJPG\Mp4ToJPG\Debug\Mp4ToJPG.Build.CppClean.log

?????文件?????????95??2018-03-22?11:25??Mp4ToJPG\Mp4ToJPG\Debug\Mp4ToJPG.log

?????文件????1393457??2017-08-29?16:46??Mp4ToJPG\Mp4ToJPG\demo.mp4

?????文件???????9216??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\end_swr.txt

?????文件???????5721??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\inttypes.h

?????文件?????175612??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavcodec\avcodec.h

?????文件???????3111??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavcodec\avfft.h

?????文件???????2392??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavcodec\dxva2.h

?????文件??????10654??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavcodec\old_codec_ids.h

?????文件???????4007??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavcodec\vaapi.h

?????文件???????4094??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavcodec\vda.h

?????文件???????6200??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavcodec\vdpau.h

?????文件???????5593??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavcodec\version.h

?????文件???????6062??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavcodec\xvmc.h

?????文件??????16642??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavdevice\avdevice.h

?????文件???????1861??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavdevice\version.h

?????文件???????3321??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavfilter\asrc_abuffer.h

?????文件???????3784??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavfilter\avcodec.h

?????文件??????56887??2017-08-15?17:29??Mp4ToJPG\Mp4ToJPG\include\libavfilter\avfilter.h

............此處省略116個文件信息