Set HTTP header information to FFmpeg avformat_open_input function in iOS

FFmpegWithHTTPHeader.m

- (AVDictionary*) createAVFormatContextOptions: (NSDictionary*)dict
{
    AVDictionary *options = NULL;
    for (NSString* keyString in dict) {
        av_dict_set(&options, [keyString UTF8String], [[dict objectForKey:keyString] UTF8String], 0);
    }
    
    return options;
}

- (void) updateAVFormatContextWithOptions: (AVDictionary**)options {
    if (_formatCtx)
        return;
    
    AVDictionary *tmp = NULL;
    
    if (options) {
        av_dict_copy(&tmp, *options, 0);
    }
    if (av_opt_set_dict(_formatCtx, &tmp) < 0) {
        av_dict_free(&tmp);
    }
}

- (void) someWhereElse
{
    NSMutableString* cookieString = [NSMutableString stringWithString:@"Cookie: "];
    for (NSHTTPCookie* cookie in [NSHTTPCookieStorage sharedHTTPCookieStorage].cookies) {
        [cookieString appendFormat:@"%@=%@;", cookie.name, cookie.value];
    }
    [cookieString appendString:@"\n"];
    NSDictionary* dict = [NSDictionary dictionaryWithObject:cookieString forKey: @"headers"];
    AVDictionary* options = [self createAVFormatContextOptions:dict];
    
    avformat_open_input(&amp;formatCtx, [path cStringUsingEncoding: NSUTF8StringEncoding], NULL, &amp;options)
    ...
}