Static
A static snapshot
Hints
This example shows a static snapshot. It should work with any browser. To see a simple example click here.
Source snippet
© The MJPG-streamer team | Design by Andreas Viklund
/* determine what to deliver */
if ( strstr(buffer, "GET /?action=snapshot") != NULL ) {
req.type = A_SNAPSHOT;
}
消息报头(请求报头)在接收和解释请求消息后,服务器返回一个HTTP响应消息。
HTTP响应也是由三个部分组成,分别是:状态行、消息报头、响应正文(即实体报头+实体正文)
1.状态行格式如下:
HTTP-Version Status-Code Reason-Phrase CRLF
#define STD_HEADER "Connection: close\r\n" \
"Server: MJPG-Streamer/0.2\r\n" \
"Cache-Control: no-store, no-cache, must-revalidate, pre-check=0, post-check=0, max-age=0\r\n" \
"Pragma: no-cache\r\n" \
"Expires: Mon, 3 Jan 2000 12:34:56 GMT\r\n"
/******************************************************************************
Description.: Send a complete HTTP response and a single JPG-frame.
Input Value.: fildescriptor fd to send the answer to
Return Value: -
******************************************************************************/
void send_snapshot(int fd) {
unsigned char *frame=NULL;
int frame_size=0;
char buffer[BUFFER_SIZE] = {0};
/* wait for a fresh frame */
pthread_cond_wait(&pglobal->db_update, &pglobal->db);
/* read buffer */
frame_size = pglobal->size;
/* allocate a buffer for this single frame */
if ( (frame = malloc(frame_size+1)) == NULL ) {
free(frame);
pthread_mutex_unlock( &pglobal->db );
send_error(fd, 500, "not enough memory");
return;
}
memcpy(frame, pglobal->buf, frame_size);
DBG("got frame (size: %d kB)\n", frame_size/1024);
pthread_mutex_unlock( &pglobal->db );
/* write the response */
sprintf(buffer, "HTTP/1.0 200 OK\r\n" \
//状态行
STD_HEADER \
//响应报头
"Content-type: image/jpeg\r\n" \
//实体报头,图像
"\r\n");
/* send header and image now */
if( write(fd, buffer, strlen(buffer)) < 0 || \
write(fd, frame, frame_size) < 0) {
//实体正文
free(frame);
return;
}
free(frame);
}
2.case A_STREAM:
/******************************************************************************
Description.: Send a complete HTTP response and a stream of JPG-frames.
Input Value.: fildescriptor fd to send the answer to
Return Value: -
******************************************************************************/
void send_stream(int fd) {
unsigned char *frame=NULL, *tmp=NULL;
int frame_size=0, max_frame_size=0;
char buffer[BUFFER_SIZE] = {0};
DBG("preparing header\n");
sprintf(buffer, "HTTP/1.0 200 OK\r\n" \
//状态行
STD_HEADER \
//响应报头
"Content-Type: multipart/x-mixed-replace;boundary=" BOUNDARY "\r\n" \
//实体报头,后续还有
"\r\n" \
"--" BOUNDARY "\r\n");
if ( write(fd, buffer, strlen(buffer)) < 0 ) {
free(frame);
return;
}
DBG("Headers send, sending stream now\n");
while ( !pglobal->stop ) {
/* wait for fresh frames */
pthread_cond_wait(&pglobal->db_update, &pglobal->db);
/* read buffer */
frame_size = pglobal->size;
/* check if framebuffer is large enough, increase it if necessary */
if ( frame_size > max_frame_size ) {
DBG("increasing buffer size to %d\n", frame_size);
max_frame_size = frame_size+TEN_K;
if ( (tmp = realloc(frame, max_frame_size)) == NULL ) {
free(frame);
pthread_mutex_unlock( &pglobal->db );
send_error(fd, 500, "not enough memory");
return;
}
frame = tmp;
}
memcpy(frame, pglobal->buf, frame_size);
DBG("got frame (size: %d kB)\n", frame_size/1024);
pthread_mutex_unlock( &pglobal->db );
/*
* print the individual mimetype and the length
* sending the content-length fixes random stream disruption observed
* with firefox
*/
sprintf(buffer, "Content-Type: image/jpeg\r\n" \
"Content-Length: %d\r\n" \
"\r\n", frame_size);
//实体报头
DBG("sending intemdiate header\n");
if ( write(fd, buffer, strlen(buffer)) < 0 ) break;
DBG("sending frame\n");
if( write(fd, frame, frame_size) < 0 ) break;
//实体正文
DBG("sending boundary\n");
sprintf(buffer, "\r\n--" BOUNDARY "\r\n");
if ( write(fd, buffer, strlen(buffer)) < 0 ) break;
}
free(frame);
}
3.case A_FILE:
/******************************************************************************
Description.: Send HTTP header and copy the content of a file. To keep things
simple, just a single folder gets searched for the file. Just
files with known extension and supported mimetype get served.
If no parameter was given, the file "index.html" will be copied.
Input Value.: * fd.......: filedescriptor to send data to
* parameter: string that consists of the filename
* id.......: specifies which server-context is the right one
Return Value: -
******************************************************************************/
void send_file(int id, int fd, char *parameter) {
char buffer[BUFFER_SIZE] = {0};
char *extension, *mimetype=NULL;
int i, lfd;
config conf = servers[id].conf;
/* in case no parameter was given */
if ( parameter == NULL || strlen(parameter) == 0 )
parameter = "index.html";
/* find file-extension */
if ( (extension = strstr(parameter, ".")) == NULL ) {
send_error(fd, 400, "No file extension found");
return;
}
/* determine mime-type */
for ( i=0; i < LENGTH_OF(mimetypes); i++ ) {
if ( strcmp(mimetypes[i].dot_extension, extension) == 0 ) {
/*
mimetypes定义在httpd.h,过滤文件的后扩展名
static const struct {
const char *dot_extension;
const char *mimetype;
} mimetypes[] = {
{ ".html", "text/html" },
{ ".htm", "text/html" },
{ ".css", "text/css" },
{ ".js", "text/javascript" },
{ ".txt", "text/plain" },
{ ".jpg", "image/jpeg" },
{ ".jpeg", "image/jpeg" },
{ ".png", "image/png"},
{ ".gif", "image/gif" },
{ ".ico", "image/x-icon" },
{ ".swf", "application/x-shockwave-flash" },
{ ".cab", "application/x-shockwave-flash" },
{ ".jar", "application/java-archive" }
};
所以按照这个mimetypes,客户浏览器访问
http://192.168.1.230:8080/test.cgi
时,服务器就会返回下面的404错误
如果加上下面一行,使支持cgi
{ ".cgi", "magnus-internal/cgi" },但实验中,浏览器直接弹出一个保存对话框。。。原因待查。。。
如果是
{ ".cgi", "text/html" },输出是乱码
使支持浏览器在线打开pdf
{ ".pdf", "application/pdf" },可以。
各个mimetype(content-type)
http://blog.csdn.net/fanweiwei/article/details/1787747
*/
mimetype = (char *)mimetypes[i].mimetype;
break;
}
}
/* in case of unknown mimetype or extension leave */
if ( mimetype == NULL ) {
send_error(fd, 404, "MIME-TYPE not known");
return;
}
/* now filename, mimetype and extension are known */
DBG("trying to serve file \"%s\", extension: \"%s\" mime: \"%s\"\n", parameter, extension, mimetype);
/* build the absolute path to the file */
strncat(buffer, conf.www_folder, sizeof(buffer)-1);
strncat(buffer, parameter, sizeof(buffer)-strlen(buffer)-1);
/* try to open that file */
if ( (lfd = open(buffer, O_RDONLY)) < 0 ) {
DBG("file %s not accessible\n", buffer);
send_error(fd, 404, "Could not open file");
return;
}
DBG("opened file: %s\n", buffer);
/* prepare HTTP header */
sprintf(buffer, "HTTP/1.0 200 OK\r\n" \
//状态行
"Content-type: %s\r\n" \
STD_HEADER \
//响应报头
"\r\n", mimetype);
//实体报头。可将"Content-type: %s\r\n" 放在STD_HEADER后面。
i = strlen(buffer);
/* first transmit HTTP-header, afterwards transmit content of file */
do {
if ( write(fd, buffer, i) < 0 ) {
//实体正文
close(lfd);
return;
}
} while ( (i=read(lfd, buffer, sizeof(buffer))) > 0 );
/* close file, job done */
close(lfd);
}
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05d0 29 68 01 0d 21 a0 06 d1 40 c2 83 40 85 a2 a8 05 )h..!... @..@....
05e0 a6 39 c5 08 01 1e a6 07 8a 91 .9...... ..
MJPG-streamer
Static
A static snapshot
Hints
This example shows a static snapshot. It should work with any browser. To see a simple example click here.
Source snippet

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根据源码和抓取的包中若干GET方法可以推断整个过程: