/*
?*?Copyright?（c）?2001?Fabrice?Bellard
?*
?*?Permission?is?hereby?granted?free?of?charge?to?any?person?obtaining?a?copy
?*?of?this?software?and?associated?documentation?files?（the?“Software“）?to?deal
?*?in?the?Software?without?restriction?including?without?limitation?the?rights
?*?to?use?copy?modify?merge?publish?distribute?sublicense?and/or?sell
?*?copies?of?the?Software?and?to?permit?persons?to?whom?the?Software?is
?*?furnished?to?do?so?subject?to?the?following?conditions:
?*
?*?The?above?copyright?notice?and?this?permission?notice?shall?be?included?in
?*?all?copies?or?substantial?portions?of?the?Software.
?*
?*?THE?SOFTWARE?IS?PROVIDED?“AS?IS“?WITHOUT?WARRANTY?OF?ANY?KIND?EXPRESS?OR
?*?IMPLIED?INCLUDING?BUT?NOT?LIMITED?TO?THE?WARRANTIES?OF?MERCHANTABILITY
?*?FITNESS?FOR?A?PARTICULAR?PURPOSE?AND?NONINFRINGEMENT.?IN?NO?EVENT?SHALL
?*?THE?AUTHORS?OR?COPYRIGHT?HOLDERS?BE?LIABLE?FOR?ANY?CLAIM?DAMAGES?OR?OTHER
?*?LIABILITY?WHETHER?IN?AN?ACTION?OF?CONTRACT?TORT?OR?OTHERWISE?ARISING?FROM
?*?OUT?OF?OR?IN?CONNECTION?WITH?THE?SOFTWARE?OR?THE?USE?OR?OTHER?DEALINGS?IN
?*?THE?SOFTWARE.
?*/

/**
?*?@file
?*?video?decoding?with?libavcodec?API?example
?*
?*?@example?decode_video.c
?*/

#include?
#include?
#include?

#include?

#define?INBUF_SIZE?4096

static?void?pgm_save（unsigned?char?*buf[]?int?wrap[]?int?xsize?int?ysize
?????????????????????char?*filename）
{
????FILE?*f;
????int?i;

????f?=?fopen（filename“w“）;
????fprintf（f?“P5\n%d?%d\n%d\n“?xsize?ysize?255）;

	/*?Save?Y?data?*/
????for?（i?=?0;?（wrap[0]）?&&?（i?????????fwrite（buf[0]?+?i?*?wrap[0]?1?xsize?f）;

	/*?Save?U（Cb）?data?*/
????for?（i?=?0;?（wrap[1]）?&&?（i?????????fwrite（buf[1]?+?i?*?wrap[1]?1?xsize?/?2?f）;

	/*?Save?V（Cr）?data?*/
????for?（i?=?0;?（wrap[2]）?&&?（i?????????fwrite（buf[2]?+?i?*?wrap[2]?1?xsize?/?2?f）;

????fclose（f）;
}

static?void?decode（AVCodecContext?*dec_ctx?AVframe?*frame?AVPacket?*pkt
???????????????????const?char?*filename）
{
????char?buf[1024];
????int?ret;

????ret?=?avcodec_send_packet（dec_ctx?pkt）;
????if?（ret?????????fprintf（stderr?“Error?sending?a?packet?for?decoding\n“）;
????????exit（1）;
????}

????while?（ret?>=?0）?{
????????ret?=?avcodec_receive_frame（dec_ctx?frame）;
????????if?（ret?==?AVERROR（EAGAIN）?||?ret?==?AVERROR_EOF）
????????????return;
????????else?if?（ret?????????????fprintf（stderr?“Error?during?decoding\n“）;
????????????exit（1）;
????????}

????????printf（“saving?frame?%3d\n“?dec_ctx->frame_number）;
????????fflush（stdout）;

		printf（“+++++?FLC-DBG:?format:%d?linesize[0]:%d?linesize[1]:%d?linesize[2]:%d?+++++\n\n“
			frame->format?frame->linesize[0]?frame->linesize[1]?frame->linesize[2]）;

????????/*?the?picture?is?allocated?by?the?decoder.?no?need?to
???????????free?it?*/
????????snprintf（buf?sizeof（buf）?“%s-%d“?filename?dec_ctx->frame_number）;
????????pgm_save（frame->data?frame->linesize
???