ffmpeg api实现视频转码音视频

用ffmpeg代码进行转码，音频进行了重采样

// convertVideo.cpp : 定义控制台应用程序的入口点。
//
#include “stdafx.h“
#include 
#include 
#include 

using namespace std;

extern “C“  
{  
#define __STDC_CONSTANT_MACROS
#define __STDC_FORMAT_MACROS
#include “libavcodec/avcodec.h“  
#include “libavformat/avformat.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 “libavutil/imgutils.h“
#include “libavutil/avassert.h“
#include “libavutil/channel_layout.h“
#include “libavutil/opt.h“
#include “libavutil/mathematics.h“
#include “libswscale/swscale.h“
#include “libswresample/swresample.h“
#include “libavutil/audio_fifo.h“
}; 

bool muxer（string outVideoPathstring outAudioPath）;

#define SWR_CH_MAX 32
SwrContext* initSwr（SwrContext* pSwrCtx AVFormatContext *in_fmt_ctx AVFormatContext *out_fmt_ctx int audio_index）
{
	if （out_fmt_ctx->streams[0]->codec->channels != in_fmt_ctx->streams[audio_index]->codec->channels  
        || out_fmt_ctx->streams[0]->codec->sample_rate != in_fmt_ctx->streams[audio_index]->codec->sample_rate  
		|| out_fmt_ctx->streams[0]->codec->sample_fmt != in_fmt_ctx->streams[audio_index]->codec->sample_fmt || true ）  
    {  
        if （ NULL == pSwrCtx ）   
        {  
            pSwrCtx = swr_alloc（）;  
        }  
#if LIBSWRESAMPLE_VERSION_MINOR >= 17    // 根据版本不同，选用适当函数  
        av_opt_set_int（pSwrCtx “ich“ in_fmt_ctx->streams[audio_index]->codec->channels 0）;  
        av_opt_set_int（pSwrCtx “och“ out_fmt_ctx->streams[0]->codec->channels 0）;  
        av_opt_set_int（pSwrCtx “in_sample_rate“  in_fmt_ctx->streams[audio_index]->codec->sample_rate 0）;  
        av_opt_set_int（pSwrCtx “out_sample_rate“  out_fmt_ctx->streams[0]->codec->sample_rate 0）;  
        av_opt_set_sample_fmt（pSwrCtx “in_sample_fmt“ in_fmt_ctx->streams[audio_index]->codec->sample_fmt 0）;  
        av_opt_set_sample_fmt（pSwrCtx “out_sample_fmt“ out_fmt_ctx->streams[0]->codec->sample_fmt 0）;  
  
#else  
        pSwrCtx = swr_alloc_set_opts（pSwrCtx  
            out_fmt_ctx->streams[0]->codec->channel_layout   
            out_fmt_ctx->streams[0]->codec->sample_fmt   
            in_fmt_ctx->streams[audio_index]->codec->sample_rate  
            in_fmt_ctx->streams[audio_index]->codec->channel_layout > 0 ?in_fmt_ctx->streams[audio_index]->codec->channel_layout : AV_CH_LAYOUT_STEREO   
            in_fmt_ctx->streams[audio_index]->codec->sample_fmt   
            in_fmt_ctx->streams[audio_index]->codec->sample_rate  
            0 NULL）;  
#endif  
        swr_init（pSwrCtx）;
		return pSwrCtx;
    }
	return NULL;
}

void setup_array（uint8_t* out[SWR_CH_MAX] AVframe* in_frame int format int samples）
{
	if （av_sample_fmt_is_planar（（AVSampleFormat）format）） 
	{
		int i;
		int plane_size = av_get_bytes_per_sample（（AVSampleF

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2015-06-15 17:47  TestForConvertVideo\
     目录           0  2015-05-20 15:24  TestForConvertVideo\Debug\
     文件       70144  2015-05-25 17:29  TestForConvertVideo\Debug\TestForConvertVideo.exe
     文件      578992  2015-05-25 17:29  TestForConvertVideo\Debug\TestForConvertVideo.ilk
     文件      961536  2015-05-25 17:29  TestForConvertVideo\Debug\TestForConvertVideo.pdb
     目录           0  2015-06-15 17:46  TestForConvertVideo\ipch\
     目录           0  2015-06-15 17:47  TestForConvertVideo\ipch\testforconvertvideo-2fd58473\
     目录           0  2015-05-20 14:39  TestForConvertVideo\TestForConvertVideo\
     文件         924  2015-05-19 10:37  TestForConvertVideo\TestForConvertVideo.sln
     文件       31232  2015-06-15 17:47  TestForConvertVideo\TestForConvertVideo.suo
     文件    18936320  2014-05-06 10:08  TestForConvertVideo\TestForConvertVideo\avcodec-55.dll
     文件     1340928  2014-05-06 10:08  TestForConvertVideo\TestForConvertVideo\avdevice-55.dll
     文件     2034688  2014-05-06 10:08  TestForConvertVideo\TestForConvertVideo\avfilter-4.dll
     文件     5342720  2014-05-06 10:08  TestForConvertVideo\TestForConvertVideo\avformat-55.dll
     文件      418304  2014-05-06 10:08  TestForConvertVideo\TestForConvertVideo\avutil-52.dll
     文件       28536  2015-05-27 17:25  TestForConvertVideo\TestForConvertVideo\convertVideo.cpp
     文件     1709108  2014-01-05 12:46  TestForConvertVideo\TestForConvertVideo\cuc_ieschool.ts
     目录           0  2015-05-25 17:29  TestForConvertVideo\TestForConvertVideo\Debug\
     文件        1698  2015-05-25 17:29  TestForConvertVideo\TestForConvertVideo\Debug\cl.command.1.tlog
     文件       23138  2015-05-25 17:29  TestForConvertVideo\TestForConvertVideo\Debug\CL.read.1.tlog
     文件        4924  2015-05-25 17:28  TestForConvertVideo\TestForConvertVideo\Debug\CL.read.2.tlog
     文件        1874  2015-05-25 17:29  TestForConvertVideo\TestForConvertVideo\Debug\CL.write.1.tlog
     文件      145813  2015-05-25 17:29  TestForConvertVideo\TestForConvertVideo\Debug\convertVideo.obj
     文件           2  2015-05-25 17:29  TestForConvertVideo\TestForConvertVideo\Debug\link-cvtres.read.1.tlog
     文件           2  2015-05-25 17:29  TestForConvertVideo\TestForConvertVideo\Debug\link-cvtres.write.1.tlog
     文件           2  2015-05-25 17:29  TestForConvertVideo\TestForConvertVideo\Debug\link.9464-cvtres.read.1.tlog
     文件           2  2015-05-25 17:29  TestForConvertVideo\TestForConvertVideo\Debug\link.9464-cvtres.write.1.tlog
     文件           2  2015-05-25 17:29  TestForConvertVideo\TestForConvertVideo\Debug\link.9464.read.1.tlog
     文件           2  2015-05-25 17:29  TestForConvertVideo\TestForConvertVideo\Debug\link.9464.write.1.tlog
     文件           2  2015-05-25 17:29  TestForConvertVideo\TestForConvertVideo\Debug\link.9900-cvtres.read.1.tlog
     文件           2  2015-05-25 17:29  TestForConvertVideo\TestForConvertVideo\Debug\link.9900-cvtres.write.1.tlog
............此处省略142个文件信息