extern const URLProtocol ff_tcp_protocol; extern const URLProtocol ff_tls_protocol; extern const URLProtocol ff_udp_protocol; file协议默认白名单有file/crypto/data,位于libavformat/file.c,定义如下: const URLProtocol ff_file_protocol = { .name = "file", .url_open = file_open, .url_read = ...
1、解协议(http,rtsp,rtmp,mms) AVIOContext,URLProtocol,URLContext主要存储视音频使用的协议的类型以及状态。URLProtocol存储输入视音频使用的封装格式。每种协议都对应一个URLProtocol结构。(注意:FFMPEG中文件也被当做一种协议“file”) 2、解封装(flv,avi,rmvb,mp4) AVFormatContext主要存储视音频封装格式中包含的...
av_log(NULL, AV_LOG_WARNING,"https protocol not found, recompile with openssl or gnutls enabled.\n"); return AVERROR_PROTOCOL_NOT_FOUND; } 从代码中可以看出,ffurl_alloc()主要调用了2个函数:url_find_protocol()根据文件路径查找合适的URLProtocol,url_alloc_for_protocol()为查找到的URLProtocol创...
URLProtocol ff_udp_protocol={.name="udp",.url_open=udp_open,.url_read=udp_read,.url_write=udp_write,.url_close=udp_close,.url_get_file_handle=udp_get_file_handle,.priv_data_size=sizeof(UDPContext),.priv_data_class=&udp_context_class,.flags=URL_PROTOCOL_FLAG_NETWORK,}; 上文中简单...
URLProtocol是FFMPEG操作文件的结构(包括文件,网络数据流等等),包括open、close、read、write、seek等操作。 在av_register_all()函数中,通过调用REGISTER_PROTOCOL()宏,所有的URLProtocol都保存在以first_protocol为链表头的链表中 URLProtocol结构体的定义为: ...
示例3: input_avio_open ▲点赞 3▼ staticintinput_avio_open(input_plugin_t*this_gen){avio_input_plugin_t*this= (avio_input_plugin_t*) this_gen;inttoread = MAX_PREVIEW_SIZE;inttrycount =0;if(!this->pb) {/* try to open libavio protocol */if(avio_open2(&this->pb,this->mrl_pr...
avioffmpeg源代码urlcontexturlprotocolffurl FFmpeg源代码简单分析:avio_open2() 本文简单分析FFmpeg中一个常用的函数avio_open2()。该函数用于打开FFmpeg的输入输出文件。avio_open2()的声明位于libavformat\avio.h文件中,如下所示。 [cpp] viewplaincopy 1. /** 2. * Create and initialize a AVIOContext for...
在使用avio实现内存输出时,需要首先创建一个AVIOContext结构体,并将内存数据缓冲区和缓冲区大小作为参数传递给avio_open函数进行初始化。之后,可以使用avio_write函数将数据写入缓冲区中,并在完成输出后调用avio_close函数关闭AVIOContext结构体。 总的来说,内存输入和输出是指在使用FFmpeg进行音视频处理时,将数据从内存...
@param options A dictionary filled with protocol-private options. On return this parameter will be destroyed and replaced with a dict containing options that were not found. May be NULL. @return >= 0 in case of success, a negative value corresponding to an ...
@param options A dictionary filled with protocol-private options. On return this parameter will be destroyed and replaced with a dict containing options that were not found. May be NULL. @return >= 0 in case of success, a negative value corresponding to an ...