#include?“ffmpegthread.h“
#include?
#include?
#include?
#include?
#include?
#include?
#include?
extern?bool?stopSave;
extern?bool?ifNew;
extern?unsigned?char?r[320*240];
extern?unsigned?char?g[320*240];
extern?unsigned?char?b[320*240];


ffmpegthread::ffmpegthread（Qobject?*parent）?:
????QThread（parent）
{
//????sws_flags?=?SWS_BICUBIC;
????fillTimes?=?0;
????time（&t）;
????local_time?=?localtime（&t）;
????datetime?=?new?QDateTime;
}


/*使用默任格式的編解碼器來增加一個視頻流并初始化編解碼器*/
AVStream?*?ffmpegthread::add_video_stream（AVFormatContext?*oc?CodecID?codec_id）
{
????AVCodecContext?*c;
????AVStream????*st;

????/*增加一個新的流到一個媒體文件*/
????st?=?av_new_stream（oc0）;

????/*初始化編解碼器*/
????c?=?st->codec;
????c->codec_id?=?codec_id;
????c->codec_type?=?AVMEDIA_TYPE_VIDEO;

????/*put?sample?parameters*/
????c->bit_rate?=?400000;???//400kbit/s
????c->width?=?320;
????c->height?=?240;
????/*設置針率?該針率為25其實timebase?=?1/framerate*/
????c->time_base?=?（AVRational）{15};
????/*設置GOP大小?表示每10針會插入一個I針*/
????c->gop_size?=?10;
????/*設置像素格式*/
????c->pix_fmt?=?PIX_FMT_YUV420P;
????if（c->codec_id?==?CODEC_ID_MPEG2VIDEO）
????{
????????/*該值表示在兩個非B針之間所允許插入的B針的最大針數*/
????????c->max_b_frames?=?2;
????}
????if（c->codec_id?==?CODEC_ID_MPEG1VIDEO）
????{
????????c->mb_decision?=?2;
????}
????/*some?formats?want?stream?headers?to?be?seperate*/
????if（oc->oformat->flags?&?AVFMT_GLOBALHEADER）
????????c->flags?|=?CODEC_FLAG_GLOBAL_HEADER;
????return?st;
}


/*分配原始圖像*/
AVframe?*ffmpegthread::alloc_picture（enum?PixelFormat?pix_fmt?int?width?int?height）
{
????AVframe?*picture;
????uint8_t?*picture_buf;
????int?size?=?0;

????/*分配一個AVframe并設置默任值*/
????picture?=?avcodec_alloc_frame（）;
????if（!picture）
????????return?NULL;
????//by?lzc
????picture->format?=?pix_fmt;
????picture->width?=?width;
????picture->height?=?height;
????picture->linesize[0]?=?width;
????picture->linesize[1]?=?width/2;
????picture->linesize[2]?=?width/2;

????/*計算對于給定的圖片格式以及寬和高所需占用多少內存*/
????size?=?avpicture_get_size（pix_fmtwidthheight）;
????picture_buf?=?（uint8_t?*）av_malloc（size）;//分配所需內存
????if（!picture_buf）
????{
????????av_free（picture）;
????????return?NULL;
????}

?????/*用?ptr?中的內容根據文件格式（YUV...）和分辨率填充?picture。這里由于是在初始
????化階段所以填充的可能全是零*/
????avpicture_fill（（AVPicture?*）picturepicture_bufpix_fmtwidthheight）;??????//這里輸入換存針
????return?picture;
}


/*打開視頻編解碼器并分配必要的編碼緩存?主要是對視頻編碼器（或解碼器）的初始化過程*/
void?ffmpegthread::open_video（AVFormatContext?*oc?AVStream?*st）
{
????AVCodec?*codec;
????AVCodecContext?*c;

????c?=?st->codec;

????codec?=?avcodec_find_encoder（c->codec_id）;//編碼時找編碼器
????if（!codec）
????{
????????fprintf（stderr“codec?not?found\n“）;
????}
????/*open?the?codec*/
????if（avcodec_open（ccodec）?????{
????????fprintf（stderr“could?not?open?codec\n“）;
????????exit（1）;
????}

????video_outbuf?=?NULL;
????if（!（oc->oformat->flags?&?AVFMT_RAWPICTURE））
????{
????????/*allocate?output?buffer*/
????????video_outbuf_size?=?200000;
????????video_outbuf?=?（uint8_t?*）

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2013-06-11?09:54??myclient\
?????文件???????11140??2013-06-01?13:02??myclient\ffmpegthread.cpp
?????文件????????2091??2013-06-01?13:02??myclient\ffmpegthread.h
?????文件?????????787??2013-06-07?18:17??myclient\login.cpp
?????文件?????????398??2013-06-07?18:04??myclient\login.h
?????文件????????2811??2013-06-07?18:16??myclient\login.ui
?????文件?????????715??2013-06-07?18:14??myclient\main.cpp
?????文件????????4427??2013-06-07?16:42??myclient\mainwindow.cpp
?????文件?????????836??2013-06-01?13:02??myclient\mainwindow.h
?????文件????????5376??2013-06-07?16:38??myclient\mainwindow.ui
?????文件?????????589??2013-06-07?17:01??myclient\myclient.pro
?????文件???????16608??2013-06-09?09:28??myclient\myclient.pro.user
?????文件?????????402??2013-06-03?09:56??myclient\timethread.cpp
?????文件?????????380??2013-06-01?10:19??myclient\timethread.h
?????目錄???????????0??2013-06-11?09:54??myqtvideo\
?????文件?????????662??2013-05-16?20:45??myqtvideo\image.cpp
?????文件?????????355??2013-05-16?16:30??myqtvideo\image.h
?????文件?????????475??2013-06-07?18:19??myqtvideo\main.cpp
?????文件????????2550??2013-06-01?17:42??myqtvideo\mainwindow.cpp
?????文件?????????804??2013-06-01?17:01??myqtvideo\mainwindow.h
?????文件?????????956??2013-06-01?17:42??myqtvideo\mainwindow.ui
?????文件???????10058??2013-05-31?23:29??myqtvideo\Makefile
?????文件?????????491??2013-05-16?17:33??myqtvideo\myqtvideo.pro
?????文件???????16611??2013-06-09?09:28??myqtvideo\myqtvideo.pro.user
?????文件????????6042??2013-05-16?17:19??myqtvideo\v4l2.cpp
?????文件?????????866??2013-05-16?16:55??myqtvideo\v4l2.h
?????文件???????57744??2013-10-26?12:55??圖片1.png
?????文件??????380185??2013-10-26?12:55??圖片2.png
?????文件?????1018278??2013-10-26?12:55??圖片3.png