ToLower(); if (extension == "bmp") { iformat...} else if (extension == "emf") { iformat...} else if (extension == "gif") { iformat...} else if (extension == "png") { iformat...= System.Drawing.Imaging.ImageFormat.Wmf; } bmp.Save(ms, iformat
avformat_open_input 调用init_input:打开文件,探测视频格式 调用avio_skip:跳过初始化的字节 调用ff_id3v2_read_dict:判断是否有id3v2格式的字段 调用s->iformat...av_dict_copy(&tmp2, *options, 0); if ((ret = s->iformat->read_header2(s, &tmp2)) < 0)...goto fail; } else if (s->iformat->read_header && (ret = s->iformat->read_header(s)) iformat->name, "mp3") || !strcmp(s->iformat->name, "aac") || !...strcmp(s->iformat->name, "tta")) { if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta))
//这个是重点了,等下就可以在这个接口里面找到read_threadl了,这里这个接口就是打开输入的媒体文件 is = stream_open(input_filename, file_iformat...就会调用它: 下面开始解读stream_open这个接口: static VideoState *stream_open(const char *filename, AVInputFormat *iformat...is->filename) goto fail; is->iformat = iformat;//指向解复用器 is->ytop = 0;//初始化播放窗口y的起始坐标为...所以这个结构体里面的内容,大家务必要了解清楚: typedef struct VideoState { SDL_Thread *read_tid; // 读线程句柄 AVInputFormat *iformat...int64_t seek_rel; // 本次seek的位置增量 int read_pause_return; AVFormatContext *ic; // iformat
这个类使用了一个简单但很宽松的接口: IFormat.php <?...php interface IFormat { public function formatCSS(); public function formatGraphics(); public / /function...php include_once('IFormat.php'); class Desktop implements IFormat { public function formatCSS() {...php include_once('IFormat.php'); include_once('Mobile.php'); class MobileAdapter implements IFormat {...MobileAdapter方法都包装了一个Mobile方法.碰巧的是, 适配器参与者中的一个方法并不在适配器接口中(verticalLayout());它们可能完全不同, 适配器只是把它们包装在适配器接口(IFormat
以下是通过打 Log 的方式: logI("file path is %s", mFormatContext->filename); logI("iformat name is %s",...mFormatContext->iformat->name); logI("nb_streams is %d", mFormatContext->nb_streams); logI("...mFormatContext->duration); logI("start time is %lld",mFormatContext->start_time); 打印的结果如下: [av-beginner]: iformat
(videoIndex > 0) { AVStream* videoStream = formatCtx->streams[videoIndex]; AVInputFormat* iformat...= formatCtx->iformat; if (strcmp(iformat->name, "mov,mp4,m4a,3gp,3g2,mj2") == 0) { std
-> iformat! print! -> iprint! println! -> iprintln! eprint! -> ieprint! eprintln!...-> iformat_args! Repo ansi-parser - ANSI转义序列解析库 ANSI转义序列 就是这种 "This is \u{1b}[3Asome text!"
AVDictionary* options = NULL; av_dict_set(&options,"list_devices","true",0); AVInputFormat *iformat...avfoundation"); printf("==AVFoundation Device Info===\n"); avformat_open_input(&pFormatCtx,"",iformat...options); printf("=============================\n"); if(avformat_open_input(&pFormatCtx,"0",iformat
libavformat.AvformatAllocContext()var options *libavutil.AVDictionarylibavutil.AvDictSet(&options, "list_devices", "true", 0)iformat...fmt.Printf("========Device Info=============\n")libavformat.AvformatOpenInput(&pFormatCtx, "video=dummy", iformat...libavformat.AvformatAllocContext()var options *libavutil.AVDictionarylibavutil.AvDictSet(&options, "list_devices", "true", 0)iformat...avfoundation")fmt.Printf("==AVFoundation Device Info===\n")libavformat.AvformatOpenInput(&pFormatCtx, "", iformat
. */ ff_const59 struct AVInputFormat *iformat; //AVInputFormat:封装格式(flv、mkv、avi等),调用avformat_open_input...audio_codec; //音频解码器 AVCodec *subtitle_codec; //字幕解码器 ... ... } AVFormatContext; 其中iformat
流程 int main(int argc, char **argv) { ... is = stream_open(input_filename, file_iformat);//打开文件 ,同时开启解码线程...stream_open: static VideoState *stream_open(const char *filename, AVInputFormat *iformat) { VideoState...is->filename) goto fail; is->iformat = iformat; is->ytop = 0; is->xleft = 0;...decoder_init(&is->auddec, avctx, &is->audioq, is->continue_read_thread); if ((is->ic->iformat...is->ic->iformat->read_seek) { is->auddec.start_pts = is->audio_st->start_time;
(pFormatCtx->iformat->flags & AVFMT_TS_DISCONT) && strcmp("ogg",...pFormatCtx->iformat->name); // 设置最大帧间隔 mediaSync->setMaxDuration((pFormatCtx->iformat...strcmp(pFormatCtx->iformat->name, "rtsp") || (pFormatCtx->pb && !
打开流对象,进行解码播放 stream_open(input_filename,file_iformat); ffplay核心就在这个函数,这个函数创建了一个read_thread,线程完成了拉流...stream_open(input_filename, file_iformat)函数的简要分析: 1. 为VideoState分配内存 2.
AVDictionary* options = nullptr; av_dict_set(&options,"list_devices","true",0); AVInputFormat *iformat...dshow"); printf("Device Info=============\n"); avformat_open_input(&pFormatCtx,"video=dummy",iformat...show_vfw_device() { AVFormatContext *pFormatCtx = avformat_alloc_context(); AVInputFormat *iformat...vfwcap"); printf("========VFW Device Info======\n"); avformat_open_input(&pFormatCtx,"list",iformat
下面一个简单的例子表示下: struct AVFormatContext { iformat; oformat; } avformat_alloc_context(); avformat_free_context...(); class AVFormatContext { private: iformat; oformat; public: AVFormatContext...iformat对应的是AVInputFormat,oformat对应的是AVOutputFormat,正好说一下AVFormatContext和AVInputFormat/AVOutputFormat的区别
打开媒体流 VideoState *stream_open(const char *filename,const AVInputFormat *iformat) 涉及到结构体:AVInputFormat...几个主要变量的作用如下: struct AVInputFormat *iformat:输入数据的封装格式 struct AVOutputFormat *oformat:输出数据的封装格式 AVIOContext
fps_analyze_framecount = 0; /* variable fps and no guess at the real fps */ count = (ic->iformat...(ic->iformat->flags & AVFMT_NOTIMESTAMPS) && st->codec_info_nb_frames disposition...ic->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && strcmp(ic->iformat...>max_analyze_duration; ... int64_t probesize = ic->probesize; int *missing_streams = av_opt_ptr(ic->iformat
参数 psoTarget 对象的成员域 iBitmapFormat 存储的值被赋给参数 psoPattern (编译器导致的变量复用,本应是名为 iFormat 之类的局部变量),用于指示目标位图 GDI...dbmi_iFormat = *((_DWORD *)a1 + 0xF); if ( a2 && a3 ) { [...] } else { dbmi_cx = *(...据前面的分析可知,成员域 iFormat 被赋值为 0x6 数值。...根据前面的分析已经知道,被覆盖数据的 SURFACE 对象的成员域 SURFACE->so.sizlBitmap.cy 被覆盖成原应写入 ENGBRUSH 对象的成员域 iFormat 的值。...成员域 iFormat 存储用来指示目标实现笔刷的像素位格式的枚举值,在当前的系统设置中,数值 6 表示 32 位每像素点(32BPP)的枚举值。
领取专属 10元无门槛券
手把手带您无忧上云