diff --git a/trunk/src/app/srs_app_hls.cpp b/trunk/src/app/srs_app_hls.cpp
index d7efc2b05..eb7c333a2 100644
--- a/trunk/src/app/srs_app_hls.cpp
+++ b/trunk/src/app/srs_app_hls.cpp
@@ -506,13 +506,13 @@ int SrsHlsMuxer::_refresh_m3u8(string m3u8_file)
     // #EXTM3U\n#EXT-X-VERSION:3\n
     char header[] = {
         // #EXTM3U\n
-        0x23, 0x45, 0x58, 0x54, 0x4d, 0x33, 0x55, 0xa, 
+        0x23, 0x45, 0x58, 0x54, 0x4d, 0x33, 0x55, SRS_CONSTS_LF, 
         // #EXT-X-VERSION:3\n
         0x23, 0x45, 0x58, 0x54, 0x2d, 0x58, 0x2d, 0x56, 0x45, 0x52, 
-        0x53, 0x49, 0x4f, 0x4e, 0x3a, 0x33, 0xa,
-        // #EXT-X-ALLOW-CACHE:NO
+        0x53, 0x49, 0x4f, 0x4e, 0x3a, 0x33, SRS_CONSTS_LF,
+        // #EXT-X-ALLOW-CACHE:NO\n
         0x23, 0x45, 0x58, 0x54, 0x2d, 0x58, 0x2d, 0x41, 0x4c, 0x4c, 
-        0x4f, 0x57, 0x2d, 0x43, 0x41, 0x43, 0x48, 0x45, 0x3a, 0x4e, 0x4f, 0x0a
+        0x4f, 0x57, 0x2d, 0x43, 0x41, 0x43, 0x48, 0x45, 0x3a, 0x4e, 0x4f, SRS_CONSTS_LF
     };
     if ((ret = writer.write(header, sizeof(header), NULL)) != ERROR_SUCCESS) {
         srs_error("write m3u8 header failed. ret=%d", ret);
@@ -523,7 +523,7 @@ int SrsHlsMuxer::_refresh_m3u8(string m3u8_file)
     // #EXT-X-MEDIA-SEQUENCE:4294967295\n
     SrsHlsSegment* first = *segments.begin();
     char sequence[34] = {};
-    int len = snprintf(sequence, sizeof(sequence), "#EXT-X-MEDIA-SEQUENCE:%d\n", first->sequence_no);
+    int len = snprintf(sequence, sizeof(sequence), "#EXT-X-MEDIA-SEQUENCE:%d%c", first->sequence_no, SRS_CONSTS_LF);
     if ((ret = writer.write(sequence, len, NULL)) != ERROR_SUCCESS) {
         srs_error("write m3u8 sequence failed. ret=%d", ret);
         return ret;
@@ -540,7 +540,7 @@ int SrsHlsMuxer::_refresh_m3u8(string m3u8_file)
     // TODO: maybe need to take an around value
     target_duration += 1;
     char duration[34]; // 23+10+1
-    len = snprintf(duration, sizeof(duration), "#EXT-X-TARGETDURATION:%d\n", target_duration);
+    len = snprintf(duration, sizeof(duration), "#EXT-X-TARGETDURATION:%d%c", target_duration, SRS_CONSTS_LF);
     if ((ret = writer.write(duration, len, NULL)) != ERROR_SUCCESS) {
         srs_error("write m3u8 duration failed. ret=%d", ret);
         return ret;
@@ -554,7 +554,7 @@ int SrsHlsMuxer::_refresh_m3u8(string m3u8_file)
         if (segment->is_sequence_header) {
             // #EXT-X-DISCONTINUITY\n
             char ext_discon[22]; // 21+1
-            len = snprintf(ext_discon, sizeof(ext_discon), "#EXT-X-DISCONTINUITY\n");
+            len = snprintf(ext_discon, sizeof(ext_discon), "#EXT-X-DISCONTINUITY%c", SRS_CONSTS_LF);
             if ((ret = writer.write(ext_discon, len, NULL)) != ERROR_SUCCESS) {
                 srs_error("write m3u8 segment discontinuity failed. ret=%d", ret);
                 return ret;
@@ -564,16 +564,16 @@ int SrsHlsMuxer::_refresh_m3u8(string m3u8_file)
         
         // "#EXTINF:4294967295.208,\n"
         char ext_info[25]; // 14+10+1
-        len = snprintf(ext_info, sizeof(ext_info), "#EXTINF:%.3f,\n", segment->duration);
+        len = snprintf(ext_info, sizeof(ext_info), "#EXTINF:%.3f,%c", segment->duration, SRS_CONSTS_LF);
         if ((ret = writer.write(ext_info, len, NULL)) != ERROR_SUCCESS) {
             srs_error("write m3u8 segment info failed. ret=%d", ret);
             return ret;
         }
         srs_verbose("write m3u8 segment info success.");
         
-        // file name
+        // {file name}\n
         std::string filename = segment->uri;
-        filename += "\n";
+        filename += SRS_CONSTS_LF;
         if ((ret = writer.write((char*)filename.c_str(), (int)filename.length(), NULL)) != ERROR_SUCCESS) {
             srs_error("write m3u8 segment uri failed. ret=%d", ret);
             return ret;
diff --git a/trunk/src/app/srs_app_http.hpp b/trunk/src/app/srs_app_http.hpp
index 43a0a5be0..9d85116d2 100644
--- a/trunk/src/app/srs_app_http.hpp
+++ b/trunk/src/app/srs_app_http.hpp
@@ -51,13 +51,13 @@ class ISrsGoHttpResponseWriter;
 
 // http specification
 // CR             = <US-ASCII CR, carriage return (13)>
-#define __SRS_CR "\r" // 0x0D
+#define __SRS_CR SRS_CONSTS_CR // 0x0D
 // LF             = <US-ASCII LF, linefeed (10)>
-#define __SRS_LF "\n" // 0x0A
+#define __SRS_LF SRS_CONSTS_LF // 0x0A
 // SP             = <US-ASCII SP, space (32)>
-#define __SRS_SP " " // 0x20
+#define __SRS_SP ' ' // 0x20
 // HT             = <US-ASCII HT, horizontal-tab (9)>
-#define __SRS_HT "\x09" // 0x09
+#define __SRS_HT '\x09' // 0x09
 
 // HTTP/1.1 defines the sequence CR LF as the end-of-line marker for all
 // protocol elements except the entity-body (see appendix 19.3 for
diff --git a/trunk/src/kernel/srs_kernel_consts.hpp b/trunk/src/kernel/srs_kernel_consts.hpp
index eaf6f8c6a..0f6bb4c85 100644
--- a/trunk/src/kernel/srs_kernel_consts.hpp
+++ b/trunk/src/kernel/srs_kernel_consts.hpp
@@ -201,6 +201,17 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define SRS_CONSTS_RTMP_SET_DATAFRAME            "@setDataFrame"
 #define SRS_CONSTS_RTMP_ON_METADATA              "onMetaData"
 
+///////////////////////////////////////////////////////////
+// HTTP/HLS consts values
+///////////////////////////////////////////////////////////
+// @see hls-m3u8-draft-pantos-http-live-streaming-12.pdf, page 4
+// Lines are terminated by either a single LF character or a CR
+// character followed by an LF character.
+// CR             = <US-ASCII CR, carriage return (13)>
+#define SRS_CONSTS_CR '\r' // 0x0D
+// LF             = <US-ASCII LF, linefeed (10)>
+#define SRS_CONSTS_LF '\n' // 0x0A
+
 ///////////////////////////////////////////////////////////
 // HTTP consts values
 ///////////////////////////////////////////////////////////