/**
?*?最簡單的基于FFmpeg的Swscale示例
?*?Simplest?FFmpeg?Swscale
?*
?*?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
?*
?*?本程序使用libswscale對像素數據進行縮放轉換等處理。
?*?它中實現了YUV420P格式轉換為RGB24格式，
?*?同時將分辨率從480x272拉伸為1280x720
?*?它是最簡單的libswscale的教程。
?*
?*?This?software?uses?libswscale?to?scale?/?convert?pixels.
?*?It?convert?YUV420P?format?to?RGB24?format
?*?and?changes?resolution?from?480x272?to?1280x720.
?*?It‘s?the?simplest?tutorial?about?libswscale.
?*/

#include?

#define?__STDC_CONSTANT_MACROS

#ifdef?_WIN32
//Windows
extern?“C“
{
#include?“libswscale/swscale.h“
#include?“libavutil/opt.h“
#include?“libavutil/imgutils.h“
};
#else
//Linux...
#ifdef?__cplusplus
extern?“C“
{
#endif
#include?
#include?
#include?
#ifdef?__cplusplus
};
#endif
#endif


int?main（int?argc?char*?argv[]）
{
	//Parameters	
	FILE?*src_file?=fopen（“sintel_480x272_yuv420p.yuv“?“rb“）;
	const?int?src_w=480src_h=272;
	AVPixelFormat?src_pixfmt=AV_PIX_FMT_YUV420P;

	int?src_bpp=av_get_bits_per_pixel（av_pix_fmt_desc_get（src_pixfmt））;

	FILE?*dst_file?=?fopen（“sintel_1280x720_rgb24.rgb“?“wb“）;
	const?int?dst_w=1280dst_h=720;
	AVPixelFormat?dst_pixfmt=AV_PIX_FMT_RGB24;
	int?dst_bpp=av_get_bits_per_pixel（av_pix_fmt_desc_get（dst_pixfmt））;

	//Structures
	uint8_t?*src_data[4];
	int?src_linesize[4];

	uint8_t?*dst_data[4];
	int?dst_linesize[4];

	int?rescale_method=SWS_BICUBIC;
	struct?SwsContext?*img_convert_ctx;
	uint8_t?*temp_buffer=（uint8_t?*）malloc（src_w*src_h*src_bpp/8）;
	
	int?frame_idx=0;
	int?ret=0;
	ret=?av_image_alloc（src_data?src_linesizesrc_w?src_h?src_pixfmt?1）;
	if?（ret		printf（?“Could?not?allocate?source?image\n“）;
		return?-1;
	}
	ret?=?av_image_alloc（dst_data?dst_linesizedst_w?dst_h?dst_pixfmt?1）;
	if?（ret		printf（?“Could?not?allocate?destination?image\n“）;
		return?-1;
	}
	//-----------------------------	
	//Init?Method?1
	img_convert_ctx?=sws_alloc_context（）;
	//Show?AVOption
	av_opt_show2（img_convert_ctxstdoutAV_OPT_FLAG_VIDEO_PARAM0）;
	//Set?Value
	av_opt_set_int（img_convert_ctx“sws_flags“SWS_BICUBIC|SWS_PRINT_INFO0）;
	av_opt_set_int（img_convert_ctx“srcw“src_w0）;
	av_opt_set_int（img_convert_ctx“srch“src_h0）;
	av_opt_set_int（img_convert_ctx“src_format“src_pixfmt0）;
	//‘0‘?for?MPEG?（Y:0-235）;‘1‘?for?JPEG?（Y:0-255）
	av_opt_set_int（img_convert_ctx“src_range“10）;
	av_opt_set_int（img_convert_ctx“dstw“dst_w0）;
	av_opt_set_int（img_convert_ctx“dsth“dst_h0）;
	av_opt_set_int（img_convert_ctx“dst_format“dst_pixfmt0）;
	av_opt_set_int（img_convert_ctx“dst_range“10）;
	sws_init_context（img_convert_ctxNULLNULL）;

	//Init?Method?2
	//img_convert_ctx?=?sws_getContext（src_w?src_hsrc_pixfmt?dst_w?dst_h?dst_pixfmt?
	//	rescale_method?NULL?NULL?NULL）;?
	//-

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件??????????29??2015-02-12?17:39??.gitignore
?????文件?????????718??2015-02-12?17:39??ReadMe.txt
?????文件????????1397??2015-02-12?17:39??simplest_ffmpeg_swscale.sln
?????文件???????28672??2015-02-12?17:39??simplest_ffmpeg_swscale.suo
?????目錄???????????0??2015-02-12?17:39??simplest_ffmpeg_swscale\
?????文件??????????88??2015-02-12?17:39??simplest_ffmpeg_swscale\.gitignore
?????文件?????????456??2015-02-12?17:39??simplest_ffmpeg_swscale\ReadMe.txt
?????文件??????418304??2015-02-12?17:39??simplest_ffmpeg_swscale\avutil-52.dll
?????文件??????230400??2015-02-12?17:39??simplest_ffmpeg_swscale\colorbar_320x240_rgb24.rgb
?????文件?????????539??2015-02-12?17:39??simplest_ffmpeg_swscale\compile_cl.bat
?????文件?????????412??2015-02-12?17:39??simplest_ffmpeg_swscale\compile_gcc.sh
?????文件?????????431??2015-02-12?17:39??simplest_ffmpeg_swscale\compile_mingw.sh
?????文件??????115200??2015-02-12?17:39??simplest_ffmpeg_swscale\graybar_320x240_0_255_yuv420p.yuv
?????文件??????115200??2015-02-12?17:39??simplest_ffmpeg_swscale\graybar_320x240_16_235_yuv420p.yuv
?????目錄???????????0??2015-02-12?17:39??simplest_ffmpeg_swscale\include\
?????文件????????7976??2015-02-12?17:39??simplest_ffmpeg_swscale\include\_mingw.h
?????文件????????5721??2015-02-12?17:39??simplest_ffmpeg_swscale\include\inttypes.h
?????目錄???????????0??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\
?????文件????????1584??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\adler32.h
?????文件????????1834??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\aes.h
?????文件????????4230??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\attributes.h
?????文件????????4414??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\audio_fifo.h
?????文件??????????82??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\audioconvert.h
?????文件????????2113??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\avassert.h
?????文件?????????211??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\avconfig.h
?????文件???????12473??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\avstring.h
?????文件????????8561??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\avutil.h
?????文件????????2079??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\base64.h
?????文件????????2313??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\blowfish.h
?????文件????????7733??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\bprint.h
?????文件????????2901??2015-02-12?17:39??simplest_ffmpeg_swscale\include\libavutil\bswap.h
............此處省略76個文件信息