/**
?*?最簡單的基于FFmpeg的視頻解碼器（純凈版）
?*?Simplest?FFmpeg?Decoder?Pure
?*
?*?雷霄驊?Lei?Xiaohua
?*?leixiaohua1020@126.com
?*?中國傳媒大學/數字電視技術
?*?Communication?University?of?China?/?Digital?TV?Technology
?*?http://blog.csdn.net/leixiaohua1020
?*
?*
?*?本程序實現了視頻碼流（支持HEVC，H.264，MPEG2等）解碼為YUV數據。
?*?它僅僅使用了libavcodec（而沒有使用libavformat）。
?*?是最簡單的FFmpeg視頻解碼方面的教程。
?*?通過學習本例子可以了解FFmpeg的解碼流程。
?*?This?software?is?a?simplest?decoder?based?on?FFmpeg.
?*?It?decode?bitstreams?to?YUV?pixel?data.
?*?It?just?use?libavcodec?（do?not?contains?libavformat）.
?*?Suitable?for?beginner?of?FFmpeg.
?*/

#include?

#define?__STDC_CONSTANT_MACROS
#define?SDL_MAIN_HANDLED
#ifdef?_WIN32
//Windows
extern?“C“
{
#include?“libavcodec/avcodec.h“
#include?“libswscale/swscale.h“
#include?“SDL2/SDL.h“
};
#else
//Linux...
#ifdef?__cplusplus
extern?“C“
{
#endif
#include?
#include?
#ifdef?__cplusplus
};
#endif
#endif

#define?USE_SWSCALE?1

//test?different?codec
#define?TEST_H264??1
#define?TEST_HEVC??0

//SDL?Event
#define?REFRESH_EVENT??（SDL_USEREVENT?+?1）
#define?BREAK_EVENT??（SDL_USEREVENT?+?2）
#define?WINDOW_NAME?“Cameree?ACS?Video“


const?int?bpp?=?12;

int?screen_w?=?960?screen_h?=?540;
const?int?pixel_w?=?1280?pixel_h?=?720;
char?filepath_in[]?=?“video.h264“;
//?一幀圖像數據長度?width*height*3/2
int?buffer_size?=?pixel_w*pixel_h*bpp?/?8;

unsigned?char?buffer[pixel_w*pixel_h*bpp?/?8];


int?thread_exit?=?0;
bool?b_close_window?=?0;
int?refresh_video（void?*opaque）?{
	thread_exit?=?0;
	while?（!thread_exit）?{
		SDL_Event?event;
		event.type?=?REFRESH_EVENT;
		SDL_PushEvent（&event）;?//添加新的event到event?queue
		SDL_Delay（33）;?//?ms，可以自己設幀率
	}
	thread_exit?=?0;
	//Break
	SDL_Event?event;
	event.type?=?BREAK_EVENT;
	SDL_PushEvent（&event）;

	return?0;
}

int?main（int?argc?char*?argv[]）
{
	AVCodec?*pCodec;
????AVCodecContext?*pCodecCtx=?NULL;
	AVCodecParserContext?*pCodecParserCtx=NULL;

????FILE?*fp_in;
????AVframe	*pframe;?//存儲一幀解碼后的像素數據
	
	const?int?in_buffer_size=4096;
	uint8_t?in_buffer[in_buffer_size?+?FF_INPUT_BUFFER_PADDING_SIZE]={0};
	uint8_t?*cur_ptr;
	int?cur_size;
????AVPacket?packet;?//?存儲一幀（一般情況下）壓縮編碼數據
	int?ret?got_picture;
	int?y_size;


#if?TEST_HEVC
	enum?AVCodecID?codec_id=AV_CODEC_ID_HEVC;
	char?filepath_in[]=“bigbuckbunny_480x272.hevc“;
#elif?TEST_H264
	AVCodecID?codec_id=AV_CODEC_ID_H264;
#else
	AVCodecID?codec_id=AV_CODEC_ID_MPEG2VIDEO;
	char?filepath_in[]=“bigbuckbunny_480x272.m2v“;
#endif

	int?first_time=1;

#if?USE_SWSCALE
	struct?SwsContext?*img_convert_ctx;
	AVframe	*pframeYUV;
	uint8_t?*out_buffer;

#endif
	//av_log_set_level（AV_LOG_DEBUG）;
	
	avcodec_register_all（）;?//注冊所有的編解碼器

????pCodec?=?avcodec_find_decoder（codec_id）;?//查找解碼器
????if?（!pCodec）?{
????????printf（“Codec?not?found\n“）;
????????return?-1;
????}
????pCodecCtx?=?avcodec_alloc_context3（pCodec）;?//為?AVCodecContext?分配內存
????if?（!pCodec

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件??????????75??2015-07-15?16:19??.gitignore
?????文件????18936320??2015-07-15?16:19??avcodec-55.dll
?????文件??????418304??2015-07-15?16:19??avutil-52.dll
?????文件??????626669??2015-07-15?16:19??bigbuckbunny_480x272.h264
?????文件??????749932??2015-07-15?16:19??bigbuckbunny_480x272.hevc
?????文件??????918534??2015-07-15?16:19??bigbuckbunny_480x272.m2v
?????文件??????391680??2017-06-15?10:05??bigbuckbunny_480x272.yuv
?????文件?????????573??2015-07-15?16:19??compile_cl.bat
?????文件?????????458??2015-07-15?16:19??compile_gcc.sh
?????文件?????????463??2015-07-15?16:19??compile_mingw.sh
?????目錄???????????0??2017-06-15?09:46??include\
?????文件????????6002??2015-07-15?16:19??include\inttypes.h
?????目錄???????????0??2015-07-15?16:19??include\libavcodec\
?????文件??????180728??2015-07-15?16:19??include\libavcodec\avcodec.h
?????文件????????3229??2015-07-15?16:19??include\libavcodec\avfft.h
?????文件????????2488??2015-07-15?16:19??include\libavcodec\dxva2.h
?????文件???????11053??2015-07-15?16:19??include\libavcodec\old_codec_ids.h
?????文件????????4180??2015-07-15?16:19??include\libavcodec\vaapi.h
?????文件????????4262??2015-07-15?16:19??include\libavcodec\vda.h
?????文件????????6415??2015-07-15?16:19??include\libavcodec\vdpau.h
?????文件????????5759??2015-07-15?16:19??include\libavcodec\version.h
?????文件????????6232??2015-07-15?16:19??include\libavcodec\xvmc.h
?????目錄???????????0??2015-07-15?16:19??include\libavutil\
?????文件????????1639??2015-07-15?16:19??include\libavutil\adler32.h
?????文件????????1899??2015-07-15?16:19??include\libavutil\aes.h
?????文件????????4390??2015-07-15?16:19??include\libavutil\attributes.h
?????文件??????????88??2015-07-15?16:19??include\libavutil\audioconvert.h
?????文件????????4563??2015-07-15?16:19??include\libavutil\audio_fifo.h
?????文件????????2179??2015-07-15?16:19??include\libavutil\avassert.h
?????文件?????????218??2015-07-15?16:19??include\libavutil\avconfig.h
?????文件???????12829??2015-07-15?16:19??include\libavutil\avstring.h
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