/**
?*最簡(jiǎn)單的基于FFmpeg的音頻編碼器
?*Simplest?FFmpeg?Audio?Encoder
?*
?*雷霄驊?Lei?Xiaohua
?*leixiaohua1020@126.com
?*中國(guó)傳媒大學(xué)/數(shù)字電視技術(shù)
?*Communication?University?of?China?/?Digital?TV?Technology
?*http://blog.csdn.net/leixiaohua1020
?*
?*本程序?qū)崿F(xiàn)了音頻PCM采樣數(shù)據(jù)編碼為壓縮碼流（MP3，WMA，AAC等）。
?*是最簡(jiǎn)單的FFmpeg音頻編碼方面的教程。
?*通過(guò)學(xué)習(xí)本例子可以了解FFmpeg的編碼流程。
?*This?software?encode?PCM?data?to?AAC?bitstream.
?*It‘s?the?simplest?audio?encoding?software?based?on?FFmpeg.?
?*Suitable?for?beginner?of?FFmpeg?
?*/

#include?

#define?__STDC_CONSTANT_MACROS

#ifdef?_WIN32
//Windows
extern?“C“
{
#include?“l(fā)ibavcodec/avcodec.h“
#include?“l(fā)ibavformat/avformat.h“
};
#else
//Linux...
#ifdef?__cplusplus
extern?“C“
{
#endif
#include?
#include?
#ifdef?__cplusplus
};
#endif
#endif


int?flush_encoder（AVFormatContext?*fmt_ctxunsigned?int?stream_index）{
	int?ret;
	int?got_frame;
	AVPacket?enc_pkt;
	if?（!（fmt_ctx->streams[stream_index]->codec->codec->capabilities?&
		CODEC_CAP_DELAY））
		return?0;
	while?（1）?{
		enc_pkt.data?=?NULL;
		enc_pkt.size?=?0;
		av_init_packet（&enc_pkt）;
		ret?=?avcodec_encode_audio2?（fmt_ctx->streams[stream_index]->codec?&enc_pkt
			NULL?&got_frame）;
		av_frame_free（NULL）;
		if?（ret?			break;
		if?（!got_frame）{
			ret=0;
			break;
		}
		printf（“Flush?Encoder:?Succeed?to?encode?1?frame!\tsize:%5d\n“enc_pkt.size）;
		/*?mux?encoded?frame?*/
		ret?=?av_write_frame（fmt_ctx?&enc_pkt）;
		if?（ret?			break;
	}
	return?ret;
}

int?main（int?argc?char*?argv[]）
{
	AVFormatContext*?pFormatCtx;
	AVOutputFormat*?fmt;
	AVStream*?audio_st;
	AVCodecContext*?pCodecCtx;
	AVCodec*?pCodec;

	uint8_t*?frame_buf;
	AVframe*?pframe;
	AVPacket?pkt;

	int?got_frame=0;
	int?ret=0;
	int?size=0;

	FILE?*in_file=NULL;	????????????????????????//Raw?PCM?data
	int?framenum=1000;??????????????????????????//Audio?frame?number
	const?char*?out_file?=?“tdjm.aac“;??????????//Output?URL
	int?i;

	in_file=?fopen（“tdjm.pcm“?“rb“）;

	av_register_all（）;

	//Method?1.
	pFormatCtx?=?avformat_alloc_context（）;
	fmt?=?av_guess_format（NULL?out_file?NULL）;
	pFormatCtx->oformat?=?fmt;


	//Method?2.
	//avformat_alloc_output_context2（&pFormatCtx?NULL?NULL?out_file）;
	//fmt?=?pFormatCtx->oformat;

	//Open?output?URL
	if?（avio_open（&pFormatCtx->pbout_file?AVIO_FLAG_READ_WRITE）?		printf（“Failed?to?open?output?file!\n“）;
		return?-1;
	}

	audio_st?=?avformat_new_stream（pFormatCtx?0）;
	if?（audio_st==NULL）{
		return?-1;
	}
	pCodecCtx?=?audio_st->codec;
	pCodecCtx->codec_id?=?fmt->audio_codec;
	pCodecCtx->codec_type?=?AVMEDIA_TYPE_AUDIO;
	pCodecCtx->sample_fmt?=?AV_SAMPLE_FMT_S16;
	pCodecCtx->sample_rate=?44100;
	pCodecCtx->channel_layout=AV_CH_LAYOUT_STEREO;
	pCodecCtx->channels?=?av_get_channel_layout_nb_channels（pCodecCtx->channel_layout）;
	pCodecCtx->bit_rate?=?64000;??

	//Show?some?information
	av_dump_format（pFormatCtx?0?out_file?1）

?屬性????????????大小?????日期????時(shí)間???名稱(chēng)
-----------?---------??----------?-----??----
?????文件??????????28??2015-02-12?17:38??.gitignore
?????文件?????????509??2015-02-12?17:38??readme.txt
?????文件???????63611??2015-02-12?17:38??simplest_ffmpeg_audio_encoder.jpg
?????文件?????????934??2015-02-12?17:38??simplest_ffmpeg_audio_encoder.sln
?????文件???????19968??2015-02-12?17:38??simplest_ffmpeg_audio_encoder.suo
?????目錄???????????0??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\
?????文件??????????67??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\.gitignore
?????文件?????????509??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\ReadMe.txt
?????文件????19294208??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\avcodec-56.dll
?????文件?????1341440??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\avdevice-56.dll
?????文件?????2201088??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\avfilter-5.dll
?????文件?????5721088??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\avformat-56.dll
?????文件??????424960??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\avutil-54.dll
?????文件?????????632??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\compile_cl.bat
?????文件?????????439??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\compile_gcc.sh
?????文件?????????459??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\compile_mingw.sh
?????目錄???????????0??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\
?????文件????????7976??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\_mingw.h
?????文件????????5721??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\inttypes.h
?????目錄???????????0??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\libavcodec\
?????文件??????177529??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\libavcodec\avcodec.h
?????文件????????3111??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\libavcodec\avfft.h
?????文件????????3659??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\libavcodec\dv_profile.h
?????文件????????2358??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\libavcodec\dxva2.h
?????文件???????10623??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\libavcodec\old_codec_ids.h
?????文件????????4007??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\libavcodec\vaapi.h
?????文件????????5437??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\libavcodec\vda.h
?????文件????????6200??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\libavcodec\vdpau.h
?????文件????????6035??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\libavcodec\version.h
?????文件????????6062??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\libavcodec\xvmc.h
?????目錄???????????0??2015-02-12?17:38??simplest_ffmpeg_audio_encoder\include\libavdevice\
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