VIM鍥炲姝ｅ父鏄劇ず鏂規硶- %!xxd -r
Apollo Fang 2012-10-31 17:16 鍙戣〃璇勮
]]>Rtmp鏄熀浜嶵CP鍗忚鐨?鎵浠ュ湪Rtmp浼犺緭榪囩▼涓? Chunk澶撮儴浼氭牴鎹疄闄呮儏鍐典嬌鐢ㄧ畝鍖栫殑澶撮儴(12瀛楄妭鐨勫ご閮ㄦ槸瀹屾暣鐨勫ご閮?8/4/1瀛楄妭鐨勫ご閮ㄦ槸鏍規嵁瀹為檯鎯呭喌綆鍖栫殑).
. Chunk澶撮儴鐨勭畝鍖栬鍒?/span>
璇存槑:浠ヤ笂鐨?------"涓?bit鐨凜hunkId
,鐨勭涓涓狢hunk澶撮儴閫氬父浣跨敤(00------)鏍煎紡,鍖呭惈瀹屾暣鐨勫ご閮ㄤ俊鎭?渚濇鍖呭惈:鏃墮棿鎴?Message闀垮害,Message綾誨瀷1B,StreamId1B. 榪欎簺淇℃伅鍦ㄧ▼搴忎腑鏄渶瑕佷繚鐣欑殑.浠ヤ究鍚庨潰綆鍖栫殑澶撮儴,鍙牴鎹澶撮儴瀹屽杽淇℃伅.
Message鏃?Chunk鐨勫ご閮ㄩ氬父浣跨敤(01------)寮濮? 鍚庨潰榪藉姞StreamId,Message綾誨瀷鍜孧essage闀垮害涓変釜瀛楁,榪欎簺瀛楁涓庡墠涓涓狢hunk鐨勪俊鎭繚鎸佷竴鑷?渚嬪,褰撲氦閿欑殑鍙戦乂ideo/Audio Message,瀹冧滑灞炰簬鍚屼竴涓猄treamId,浣嗗叾浠栧瓧孌甸兘鍙戠敓浜嗗彉鍖?
Message鎷嗗垎鎴愮殑榪炵畫鐨勪袱涓狢hunk鐨勬椂闂存埑鍙戠敓浜嗗彉鍖栨椂(灝ゅ叾鏄疺ideo/Audio Message),渚嬪,涓涓猇ideo Message涓墠涓涓狢hunk鍜屼笅涓涓狢hunk鐨勬椂闂存埑鎴栨椂闂存埑澧為噺涓嶄竴鑷?鍚庨潰鐨凜hunk澶撮儴浼氫互(10------)寮濮? 鍐嶈拷鍔犱竴涓?瀛楄妭鐨勬椂闂存埑瀛楁鍗沖彲.
Message榪囬暱,闇瑕佺敱澶氫釜榪炵畫鐨凜hunk榪涜鍙戦佹椂,Chunk鐨勫ご閮ㄩ氬父浼氫互(11------)寮濮? 娌℃湁鍏朵粬闄勫姞瀛楁,鎵鏈夌浉鍏沖瓧孌典笌鍓嶄竴涓狢hunk淇濇寔涓鑷?
. 鍏充簬ChunkId鍜孲treamId
StreamId閫氬父鐢ㄤ互瀹屾垚鏌愪簺鐗瑰畾鐨勫伐浣? 濡備嬌鐢↖d涓?鐨凷tream鏉ュ畬鎴愬鎴風鍜屾湇鍔″櫒鐨勮繛鎺ュ拰鎺у埗,鐢↖d涓?鐨凷tream鏉ュ畬鎴怱tream鐨勬帶鍒跺拰鎾斁絳夊伐浣?
ChunkId閫氬父浼氬畬鎴愭煇涓壒瀹氱殑宸ヤ綔. 姣斿璇寸郴緇熶繚鐣欑殑ChunkId涓?鐨勫氨鍙槸鐢ㄤ簬瀹屾垚瀵筍tream鐨勬帶鍒? 鍦ㄨ閫氶亾涓?鏈嶅姟鍣ㄥ拰瀹㈡埛绔彲浠ュStream鐨勫叿浣撳睘鎬ц繘琛岃緗拰浜や簰.濡傚垱寤轟竴涓猄tream,鍛婄煡Stream緇撴潫,璁懼畾Stream鐨勫甫瀹?璁懼畾Chunk澶у皬,緇堟Message絳?榪欓噷瀵筍tream鐨勬帶鍒朵笉鏄拡瀵規煇涓猄tream鐨?鑰屾槸鍏ㄥ眬鐨?
,浣跨敤ChunkId8瀵規挱鏀捐繘琛屾帶鍒?瀹㈡埛绔彂閫?play"鍛戒護,鏈嶅姟鍣ㄤ篃浼氶氳繃ChunkId8榪欎釜閫氶亾鍛婄煡瀹㈡埛绔挱鏀劇殑鐘舵?濡傚憡鐭ュ鎴風鎾斁寮濮?鎾斁瀹屾垚絳変俊鎭?鏈嶅姟鍣ㄤ嬌鐢–hunkId5榪涜濯掍綋鏁版嵁鐨勪紶閫?濡傛灉瀹㈡埛绔渶瑕侀拡瀵硅繖浜涙暟鎹鏈嶅姟鍣ㄥ簲絳?涔熻浣跨敤璇ラ氶亾.
Apollo Fang 2012-10-31 17:09 鍙戣〃璇勮]]>
鏂囦歡
C紼嬪簭,灝嗘枃浠剁湅鍋氭槸榪炵畫瀛楄妭搴忓垪,鍏朵腑姣忎釜瀛楄妭閮藉彲浠ュ崟鐙鍙?/span>.榪欎釜涓?/span>UNIX鐜涓殑鏂囦歡緇撴瀯鏄竴鑷寸殑.浣?/span>ANSI C涓轟簡涓庡叾浠栫殑OS鐜鍏煎(姣斿Windows),鎻愪緵浜嗕袱縐嶆枃浠惰鍥?/span>: 鏂囨湰瑙嗗浘鍜屼簩榪涘埗瑙嗗浘.
鏂囨湰瑙嗗浘鍜屼簩榪涘埗瑙嗗浘
浜岃繘鍒惰鍥句腑,鏂囦歡涓殑姣忎釜瀛楄妭閮藉彲浠ヤ負紼嬪簭璁塊棶.浣嗘枃鏈鍥句腑,紼嬪簭涓湅鍒扮殑鍐呭涓庢枃浠剁殑鍐呭鍙兘涓嶅悓.
渚嬪MS-DOS鏂囨湰鏂囦歡鐢?/span>"\r\n"鏉ヨ〃紺鴻灝?/span>; Macintosh鏂囨湰鏂囦歡涓敤"\r"琛ㄧず琛屽熬; C紼嬪簭浣跨敤"\n"琛ㄧず琛屽熬. So,濡傛灉C紼嬪簭浠ユ枃鏈鍥炬ā寮忓鐞嗕竴涓?/span>MS-DOS鏂囨湰鏂囦歡,鍦ㄨ鍙栨枃浠舵椂,灝變細灝?/span>"\r\n"杞崲涓?/span>"\n",鍦ㄥ啓鍏ユ枃浠舵椂,灝變細灝?/span>"\n"杞崲涓?/span>"\r\n". Macintosh鍚岀悊.
璇寸櫧浜?/span>,涓ょ瑙嗗浘鐨勫疄鐜版槸涓鏍風殑,鍙槸鍦ㄥ鐞嗚灝炬垨澶勭悊鏂囦歡緇撳熬鏃舵湁鐐逛笉鍚岃屽凡.閲囩敤鏌愮瑙嗗浘鎵撳紑鏂囦歡鏃?/span>,娉ㄦ剰涓涓嬪氨鏄簡.
鏂囦歡緇撳熬鍜屾崲琛?/span>
鏂囦歡璇誨彇鏁版嵁鐨勭▼搴忛渶瑕佸湪杈懼埌鏂囦歡緇撳熬鏃跺仠姝?/span>.褰撳埌杈炬枃浠剁粨灝炬椂,"getc()"鍑芥暟浼氳繑鍥炰竴涓壒孌婂?/span>EOF.鎵浠?/span>C紼嬪簭鍙湁鍦ㄨ鍙栬秴鍑烘枃浠剁粨灝懼悗,鎵嶄細鍙戠幇鏂囦歡鐨勭粨灝?/span>.
涓轟簡閬垮厤璇誨彇絀烘枃浠跺甫鏉ョ殑闂,搴旇瀵規枃浠惰緭鍏ヤ嬌鐢ㄥ叆鍙ｆ潯浠跺驚鐜?/span>(浣跨敤while鎴?/span>for,閬垮厤浣跨敤do...while)濡備笅璁捐:
int ch; // Watching EOF
FILE* fp;
fp = fopen ("_FileName", "_Mode");
ch = getc (fp);
while (ch != EOF)
{
putchar (ch);
ch = getc (fp);
}
FILE* fp;
fp = fopen ("_FileName", "_Mode");
ch = getc (fp);
while (ch != EOF)
{
putchar (ch);
ch = getc (fp);
}
涓婇潰鐨勪緥瀛愬彲浠ョ湅鍋氭槸涓涓鏋?/span>,鏉ヨ繘琛屾枃浠剁粨灝劇殑鍒ゆ柇.浣?/span>ANSI C鐨勪袱縐嶆ā寮?/span>,瀵逛簬鏂囦歡緇撳熬鏈変笉鍚岀殑瑙ｉ噴.
濡傛灉鏂囦歡浠ユ枃鏈ā寮忔墦寮,C鍙互璁ゅ嚭EOF鏍囧織鏂囦歡緇撳熬.濡傛灉浠ヤ簩榪涘埗妯″紡鎵撳紑,灝變細鎶?/span>EOF褰撳仛鏄枃浠朵腑鐨勪竴涓瓧絎?/span>.鐪熸鐨勬枃浠剁粨灝捐繕鍦ㄥ悗闈?/span>.鏂囦歡鐨勭粨灝?/span>,鍙兘绱ц窡鐫EOF,褰撶劧,涔熷彲鑳界敤絀哄瓧絎﹀～鍏呮枃浠朵嬌鍏跺ぇ灝忎負256(鎴栧叾浠栨暟)鐨勫嶆暟.鍦?/span>DOS涓嬩笉鎵撳嵃絀哄瓧絎?/span>.紼嬪簭涓寘鍚簡闃叉紼嬪簭鎵撳嵃EOF瀛楃鐨勪唬鐮?/span>.
MS-DOS鐨勬枃鏈枃浠剁敤浜岃繘鍒舵ā寮忓拰鏂囨湰妯″紡鎵撳紑,C紼嬪簭灝嗙湅鍒頒笅闈㈢殑鍐呭:
| 浜岃繘鍒舵ā寮忔墦寮鏂囦歡C紼嬪簭鐪嬪埌鐨勫唴瀹?/span>: line1\r\n line2\r\n line3\r\n ^Z | 鏂囨湰妯″紡鎵撳紑鏂囦歡C紼嬪簭鐪嬪埌鐨勫唴瀹?/span>: line1\n line2\n line3\n ^Z |
渚嬪瓙 : 閫嗗簭杈撳嚭涓涓枃浠跺唴瀹?/span>
#include <stdio.h>
#include <stdlib.h>
#define MAC
#define CNTL_Z '\032' /* DOS Text File End Of File Flag */
#define SLEN 50
#define PATH
int main (void)
{
unsigned char file[SLEN];
unsigned char ch;
FILE* fp;
unsigned long count;
unsigned long last;
puts ("Enter Name Of File To Be Processed : ");
gets (file);
if ((fp = fopen (file, "rb")) == NULL)
{
printf ("Reverse Can't Open %s .\n", file);
exit (1);
}
fseek (fp, 0L, SEEK_END); /* Locate To End Of File */
last = ftell (fp);
for (count = 1L; count <= last; count++)
{
fseek (fp, -count, SEEK_END); /* Back 1 Byte */
ch = getc (fp);
if (ch != CNTL_Z && ch != '\r')
{
putchar (ch);
}
#if defined MAC || defined WIN32
/* Macintosh || Windows */
if (ch == '\r')
{
putchar ('\n');
}
else
{
putchar (ch);
}
#endif
putchar ('\n');
fclose (fp);
return 0;
}
}
#include <stdlib.h>
#define MAC
#define CNTL_Z '\032' /* DOS Text File End Of File Flag */
#define SLEN 50
#define PATH
int main (void)
{
unsigned char file[SLEN];
unsigned char ch;
FILE* fp;
unsigned long count;
unsigned long last;
puts ("Enter Name Of File To Be Processed : ");
gets (file);
if ((fp = fopen (file, "rb")) == NULL)
{
printf ("Reverse Can't Open %s .\n", file);
exit (1);
}
fseek (fp, 0L, SEEK_END); /* Locate To End Of File */
last = ftell (fp);
for (count = 1L; count <= last; count++)
{
fseek (fp, -count, SEEK_END); /* Back 1 Byte */
ch = getc (fp);
if (ch != CNTL_Z && ch != '\r')
{
putchar (ch);
}
#if defined MAC || defined WIN32
/* Macintosh || Windows */
if (ch == '\r')
{
putchar ('\n');
}
else
{
putchar (ch);
}
#endif
putchar ('\n');
fclose (fp);
return 0;
}
}
Apollo Fang 2012-10-31 16:40 鍙戣〃璇勮
]]> 1 #define REGISTER_MUXER(X,x) { \
2 extern AVOutputFormat x##_muxer; \
3 if(CONFIG_##X##_MUXER) av_register_output_format(&x##_muxer); }
4 #define REGISTER_DEMUXER(X,x) { \
5 extern AVInputFormat x##_demuxer; \
6 if(CONFIG_##X##_DEMUXER) av_register_input_format(&x##_demuxer); }
7 #define REGISTER_MUXDEMUX(X,x) REGISTER_MUXER(X,x); REGISTER_DEMUXER(X,x)
8 #define REGISTER_PROTOCOL(X,x) { \
9 extern URLProtocol x##_protocol; \
10 if(CONFIG_##X##_PROTOCOL) av_register_protocol2(&x##_protocol, sizeof(x##_protocol)); }
2 extern AVOutputFormat x##_muxer; \
3 if(CONFIG_##X##_MUXER) av_register_output_format(&x##_muxer); }
4 #define REGISTER_DEMUXER(X,x) { \
5 extern AVInputFormat x##_demuxer; \
6 if(CONFIG_##X##_DEMUXER) av_register_input_format(&x##_demuxer); }
7 #define REGISTER_MUXDEMUX(X,x) REGISTER_MUXER(X,x); REGISTER_DEMUXER(X,x)
8 #define REGISTER_PROTOCOL(X,x) { \
9 extern URLProtocol x##_protocol; \
10 if(CONFIG_##X##_PROTOCOL) av_register_protocol2(&x##_protocol, sizeof(x##_protocol)); }
"##" string in C language code is used for concatenating the two strings which is before and behind it in a macros definition.
See a test code below :
Use "gcc -E test_sharpsharp.c -o test_sharpsharp.i" command to pre-process this file
And the output file "test_sharpsharp.i" just looks like below :
The code below is useful, and you can use "##" macro definitions to realize sample templates with C language
See a test code below :
1 #define DEFINE(t, x) {t x##_##t;}
3 int main()
4 {
5 DEFINE(int, vvv);
6 return 0;
7 }
3 int main()
4 {
5 DEFINE(int, vvv);
6 return 0;
7 }
Use "gcc -E test_sharpsharp.c -o test_sharpsharp.i" command to pre-process this file
And the output file "test_sharpsharp.i" just looks like below :
1 int main()
2 {
3 {int vvv_int;};
4 return 0;
5 }
2 {
3 {int vvv_int;};
4 return 0;
5 }
The code below is useful, and you can use "##" macro definitions to realize sample templates with C language
1 #define REGISTER_DATA_COMPARE(x)\
2 static __inline x x##_compare(x key1, x key2)\
3 {\
4 if (key1 > key2) return 1;\
5 if (key1 < key2) return -1;\
6 return 0;\
7 }
In this way, you can realize a data comparing function set, when you need comparing some type of data, just register it.2 static __inline x x##_compare(x key1, x key2)\
3 {\
4 if (key1 > key2) return 1;\
5 if (key1 < key2) return -1;\
6 return 0;\
7 }
Apollo Fang 2012-06-08 10:42 鍙戣〃璇勮
]]>Apollo Fang 2012-01-07 14:35 鍙戣〃璇勮
]]>sudo apt-get install glibc-doc
sudo apt-get install manpages-posix-dev
Apollo Fang 2011-10-27 13:28 鍙戣〃璇勮
]]>2) int* A pointer point to an Integer
3) int** A pointer point to a pointer what point to an Integer
4) int* arr[N] An array that each element is a pointer point to an Integer
5) int(*arr)[N] A pointer point to an array that its each element is an Integer and it have N elements.
6) int (*fun)(int) A pointer point to a function what with an integer parameter and with an integer returning.
7) int (*fun[N])(int) An array that have N elements and each element is a pointer point to a point that point to a type of function that have an integer parameter and with an integer returning.
Maybe understand (4) type just like this :
int*[N] arr;
It means "arr"'s type is int*[]. And how to catch the meaning of int*[]? At first it's an array, and each element of this array is a pointer point to an integer.
And can understand (5) type just like this :
int[N]* arr;
It means "arr"'s type is int[]*. That's to show that this type is a pointer and this pointer point to an integer array its size is N.
It means this variable value named "fun" and its type
Well, the above are so complex, and we should follow the KISS principle that is Keep It Simple, Stupid.
Did you catch it ??
Tuesday, October 25, 2011
Apollo Fang 2011-10-25 17:28 鍙戣〃璇勮
]]>"warning C4996: 'strerror': This function or variable may be unsafe. Using strerror_s instead."
How to disable this kind deprecation? Do like bellow (VS2010):
Project -> Properties -> Configuration Properties -> C++ -> Processor -> Processor Definitions
And then add a macro definition "_CRT_SECURE_NO_WARNINGS", and use a ";" to separated with others
OK, Hit OK and enjoy the silence...
Tuesday, October 25, 2011
Apollo Fang 2011-10-25 17:26 鍙戣〃璇勮
]]>