由上代码可以看出,URLContext的filename保存了输入文件名,prot字段保存了查找到的协议操作对象指针,flags由入参指定,is_streamed及max_packet_size默认值为0, priv_data指向了一个由协议操作对象的priv_data_size指定大小的空间(考虑ff_file_protocol,即指向了一个sizeof(FileContext)大小的空间),且该空间的被初始...
av_class is set and6* passes the options down to protocols.7*8* If this AVIOContext is manually allocated, then av_class may be set by9* the caller.10*11* warning -- this field can be NULL, be sure to not pass this AVIOContext12* to any av_...
* If this AVIOContext is created by avio_open2(), av_class is set and * passes the options down to protocols. * * If this AVIOContext is manually allocated, then av_class may be set by * the caller. * * warning -- this field can be NULL, be sure to not pass this AVIOContext...
av_class is set and* passes the options down to protocols.** If this AVIOContext is manually allocated, then av_class may be set by* the caller.** warning -- this field can be NULL, be sure to not pass this AVIOContext* to any av_opt_* functions in ...
avioCtx = avio_alloc_context(ioCtxBuffer, IO_CTX_BUFFER_SIZE, 0, &bd, &read_packet, NULL,NULL); 创建AVFormatContext,并挂载 io 上下文 AVFormatContext *fmtCtx = avformat_alloc_context(); fmtCtx.pb = avioCtx fmtCtx->flags |= AVFMT_FLAG_CUSTOM_IO; ...
* If this AVIOContext is manually allocated, then av_class may be set by * the caller. * * warning -- this field can be NULL, be sure to not pass this AVIOContext * to any av_opt_* functions in that case. */constAVClass*av_class;/* ...
av_dict_set(options, "protocol_blacklist", NULL, 0); if (err)//如果协议打开失败了,如http_open打开失败了,直接返回err return err; uc->is_connected = 1;//设置is_conneced为true,设置协议已经建立连接 /* We must be careful here as ffurl_seek() could be slow, ...
*IfthisAVIOContextismanuallyallocated,thenav_classmaybesetby *thecaller. * *warning--thisfieldcanbeNULL,besuretonotpassthisAVIOContext *toanyav_opt_*functionsinthatcase. */ AVClass*av_class; unsignedchar*buffer;/**<Startofthebuffer.*/ ...
* // NULL-pointer dereference. * @endcode * * @param ptr Pointer to the pointer to the memory block which should be freed * @note `*ptr = NULL` is safe and leads to no action. * @see av_free() */ void av_freep(void *ptr); ...
CString meta=NULL,key,value; AVDictionaryEntry *m = NULL; //使用循环读出 //(需要读取的数据,字段名称,前一条字段(循环时使用),参数) while(m=av_dict_get(pFormatCtx->metadata,"",m,AV_DICT_IGNORE_SUFFIX)){ key.Format(m->key);