for bug #251, refine code before mic.

@@ -830,6 +830,17 @@ int SrsConfig::reload_vhost(SrsConfDirective* old_root)
                 }
                 srs_trace("vhost %s reload mr success.", vhost.c_str());
             }
+            // chunk_size, only one per vhost.
+            if (!srs_directive_equals(new_vhost->get("chunk_size"), old_vhost->get("chunk_size"))) {
+                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
+                    ISrsReloadHandler* subscribe = *it;
+                    if ((ret = subscribe->on_reload_vhost_chunk_size(vhost)) != ERROR_SUCCESS) {
+                        srs_error("vhost %s notify subscribes chunk_size failed. ret=%d", vhost.c_str(), ret);
+                        return ret;
+                    }
+                }
+                srs_trace("vhost %s reload chunk_size success.", vhost.c_str());
+            }
             // mw, only one per vhost
             if (!srs_directive_equals(new_vhost->get("mw_latency"), old_vhost->get("mw_latency"))) {
                 for (it = subscribes.begin(); it != subscribes.end(); ++it) {

@@ -150,6 +150,11 @@ int ISrsReloadHandler::on_reload_vhost_mw(string /*vhost*/)
     return ERROR_SUCCESS;
 }
 
+int ISrsReloadHandler::on_reload_vhost_chunk_size(string /*vhost*/)
+{
+    return ERROR_SUCCESS;
+}
+
 int ISrsReloadHandler::on_reload_vhost_transcode(string /*vhost*/)
 {
     return ERROR_SUCCESS;

@@ -67,6 +67,7 @@ public:
     virtual int on_reload_vhost_dvr(std::string vhost);
     virtual int on_reload_vhost_mr(std::string vhost);
     virtual int on_reload_vhost_mw(std::string vhost);
+    virtual int on_reload_vhost_chunk_size(std::string vhost);
     virtual int on_reload_vhost_transcode(std::string vhost);
     virtual int on_reload_ingest_removed(std::string vhost, std::string ingest_id);
     virtual int on_reload_ingest_added(std::string vhost, std::string ingest_id);

@@ -1173,7 +1173,7 @@ int SrsSource::on_audio(SrsCommonMessage* __audio)
         std::vector<SrsForwarder*>::iterator it;
         for (it = forwarders.begin(); it != forwarders.end(); ++it) {
             SrsForwarder* forwarder = *it;
-            if ((ret = forwarder->on_audio(msg.copy())) != ERROR_SUCCESS) {
+            if ((ret = forwarder->on_audio(&msg)) != ERROR_SUCCESS) {
                 srs_error("forwarder process audio message failed. ret=%d", ret);
                 return ret;
             }

@@ -162,6 +162,8 @@ void check_macro_features()
     srs_warn("MR(merged-read) is disabled, hurts read performance. @see %s", RTMP_SIG_SRS_ISSUES(241));
 #endif
 
+    srs_trace("writev limits write %d iovs a time", sysconf(_SC_IOV_MAX));
+
 #if VERSION_MAJOR > 1
     #warning "using develop SRS, please use release instead."
     srs_warn("SRS %s is develop branch, please use %s instead", RTMP_SIG_SRS_VERSION, RTMP_SIG_SRS_RELEASE);

@@ -29,6 +29,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_core_autofree.hpp>
 #include <srs_kernel_utility.hpp>
 #include <srs_protocol_buffer.hpp>
+#include <srs_protocol_utility.hpp>
 
 #include <stdlib.h>
 using namespace std;
@@ -167,22 +168,6 @@ messages.
 *****************************************************************************
 ****************************************************************************/
 /**
-* 6.1. Chunk Format
-* Extended timestamp: 0 or 4 bytes
-* This field MUST be sent when the normal timsestamp is set to
-* 0xffffff, it MUST NOT be sent if the normal timestamp is set to
-* anything else. So for values less than 0xffffff the normal
-* timestamp field SHOULD be used in which case the extended timestamp
-* MUST NOT be present. For values greater than or equal to 0xffffff
-* the normal timestamp field MUST NOT be used and MUST be set to
-* 0xffffff and the extended timestamp MUST be sent.
-*/
-#define RTMP_EXTENDED_TIMESTAMP                 0xFFFFFF
-
-/****************************************************************************
-*****************************************************************************
-****************************************************************************/
-/**
 * amf0 command message, command name macros
 */
 #define RTMP_AMF0_COMMAND_CONNECT               "connect"
@@ -756,13 +741,11 @@ int SrsProtocol::do_send_messages(SrsSharedPtrMessage** msgs, int nb_msgs)
         // always write the header event payload is empty.
         while (p < pend) {
             // always has header
-            int nbh = 0;
-            char* header = NULL;
-            generate_chunk_header(c0c3_cache, &msg->header, p == msg->payload, &nbh, &header);
+            int nbh = srs_chunk_header(c0c3_cache, &msg->header, p == msg->payload);
             srs_assert(nbh > 0);
             
             // header iov
-            iov[0].iov_base = header;
+            iov[0].iov_base = c0c3_cache;
             iov[0].iov_len = nbh;
             
             // payload iov
@@ -813,7 +796,7 @@ int SrsProtocol::do_send_messages(SrsSharedPtrMessage** msgs, int nb_msgs)
                 // sendout all messages and reset the cache, then send again.
                 if ((ret = skt->writev(out_iovs, iov_index, NULL)) != ERROR_SUCCESS) {
                     if (!srs_is_client_gracefully_close(ret)) {
-                        srs_error("send with writev failed. ret=%d", ret);
+                        srs_error("send msgs with writev failed. ret=%d", ret);
                     }
                     return ret;
                 }
@@ -834,31 +817,47 @@ int SrsProtocol::do_send_messages(SrsSharedPtrMessage** msgs, int nb_msgs)
     if (iov_index <= 0) {
         return ret;
     }
-
-    // calc the bytes of iovs, for debug.
 #if 0
+    // calc the bytes of iovs, for debug.
     int nb_bytes = 0;
     for (int i = 0; i < iov_index; i++) {
         iovec* iov = out_iovs + i;
         nb_bytes += iov->iov_len;
     }
-    srs_warn("mw %d msgs %dB in %d iovs, max_msgs=%d, nb_out_iovs=%d",
+    srs_info("mw %d msgs %dB in %d iovs, max_msgs=%d, nb_out_iovs=%d",
         nb_msgs, nb_bytes, iov_index, SRS_PERF_MW_MSGS, nb_out_iovs);
 #else
     srs_info("mw %d msgs in %d iovs, max_msgs=%d, nb_out_iovs=%d",
         nb_msgs, iov_index, SRS_PERF_MW_MSGS, nb_out_iovs);
 #endif
     
-    // send by writev
-    // sendout header and payload by writev.
-    // decrease the sys invoke count to get higher performance.
-    if ((ret = skt->writev(out_iovs, iov_index, NULL)) != ERROR_SUCCESS) {
-        if (!srs_is_client_gracefully_close(ret)) {
-            srs_error("send with writev failed. ret=%d", ret);
+    // the limits of writev iovs.
+    static int limits = sysconf(_SC_IOV_MAX);
+    
+    // send in a time.
+    if (iov_index < limits) {
+        if ((ret = skt->writev(out_iovs, iov_index, NULL)) != ERROR_SUCCESS) {
+            if (!srs_is_client_gracefully_close(ret)) {
+                srs_error("send with writev failed. ret=%d", ret);
+            }
+            return ret;
         }
         return ret;
     }
     
+    // send in multiple times.
+    int cur_iov = 0;
+    while (cur_iov < iov_index) {
+        int cur_count = srs_min(limits, iov_index - cur_iov);
+        if ((ret = skt->writev(out_iovs + cur_iov, cur_count, NULL)) != ERROR_SUCCESS) {
+            if (!srs_is_client_gracefully_close(ret)) {
+                srs_error("send with writev failed. ret=%d", ret);
+            }
+            return ret;
+        }
+        cur_iov += cur_count;
+    }
+    
     return ret;
 }
 
@@ -888,102 +887,46 @@ int SrsProtocol::do_send_and_free_packet(SrsPacket* packet, int stream_id)
     header.message_type = packet->get_message_type();
     header.stream_id = stream_id;
     header.perfer_cid = packet->get_prefer_cid();
-
-    SrsSharedPtrMessage* msg = new SrsSharedPtrMessage();
-    ret = msg->create(&header, payload, size);
+    
+    ret = do_simple_send(&header, payload, size);
     if (ret == ERROR_SUCCESS) {
-        ret = do_send_messages(&msg, 1);
-        if (ret == ERROR_SUCCESS) {
-            ret = on_send_packet(msg, packet);
-        }
+        ret = on_send_packet(&header, packet);
     }
-
-    // donot use the auto free to free the msg,
-    // for performance issue.
-    srs_freep(msg);
     
     return ret;
 }
 
-void SrsProtocol::generate_chunk_header(char* cache, SrsMessageHeader* mh, bool c0, int* pnbh, char** ph) 
+int SrsProtocol::do_simple_send(SrsMessageHeader* mh, char* payload, int size)
 {
-    // to directly set the field.
-    char* pp = NULL;
-    
-    // generate the header.
-    char* p = cache;
-    
-    // timestamp for c0/c3
-    u_int32_t timestamp = (u_int32_t)mh->timestamp;
+    int ret = ERROR_SUCCESS;
     
-    if (c0) {
-        // write new chunk stream header, fmt is 0
-        *p++ = 0x00 | (mh->perfer_cid & 0x3F);
-        
-        // chunk message header, 11 bytes
-        // timestamp, 3bytes, big-endian
-        if (timestamp < RTMP_EXTENDED_TIMESTAMP) {
-            pp = (char*)&timestamp;
-            *p++ = pp[2];
-            *p++ = pp[1];
-            *p++ = pp[0];
-        } else {
-            *p++ = 0xFF;
-            *p++ = 0xFF;
-            *p++ = 0xFF;
-        }
+    // we directly send out the packet,
+    // use very simple algorithm, not very fast,
+    // but it's ok.
+    char* p = payload;
+    char* end = p + size;
+    char c0c3[SRS_CONSTS_RTMP_MAX_FMT0_HEADER_SIZE];
+    while (p < end) {
+        int nbh = srs_chunk_header(c0c3, mh, p == payload);
         
-        // message_length, 3bytes, big-endian
-        pp = (char*)&mh->payload_length;
-        *p++ = pp[2];
-        *p++ = pp[1];
-        *p++ = pp[0];
+        iovec iovs[2];
+        iovs[0].iov_base = c0c3;
+        iovs[0].iov_len = nbh;
         
-        // message_type, 1bytes
-        *p++ = mh->message_type;
+        int payload_size = srs_min(end - p, out_chunk_size);
+        iovs[1].iov_base = p;
+        iovs[1].iov_len = payload_size;
+        p += payload_size;
         
-        // message_length, 3bytes, little-endian
-        pp = (char*)&mh->stream_id;
-        *p++ = pp[0];
-        *p++ = pp[1];
-        *p++ = pp[2];
-        *p++ = pp[3];
-    } else {
-        // write no message header chunk stream, fmt is 3
-        // @remark, if perfer_cid > 0x3F, that is, use 2B/3B chunk header,
-        // SRS will rollback to 1B chunk header.
-        *p++ = 0xC0 | (mh->perfer_cid & 0x3F);
+        if ((ret = skt->writev(iovs, 2, NULL)) != ERROR_SUCCESS) {
+            if (!srs_is_client_gracefully_close(ret)) {
+                srs_error("send packet with writev failed. ret=%d", ret);
+            }
+            return ret;
+        }
     }
     
-    // for c0
-    // chunk extended timestamp header, 0 or 4 bytes, big-endian
-    // 
-    // for c3:
-    // chunk extended timestamp header, 0 or 4 bytes, big-endian
-    // 6.1.3. Extended Timestamp
-    // This field is transmitted only when the normal time stamp in the
-    // chunk message header is set to 0x00ffffff. If normal time stamp is
-    // set to any value less than 0x00ffffff, this field MUST NOT be
-    // present. This field MUST NOT be present if the timestamp field is not
-    // present. Type 3 chunks MUST NOT have this field.
-    // adobe changed for Type3 chunk:
-    //        FMLE always sendout the extended-timestamp,
-    //        must send the extended-timestamp to FMS,
-    //        must send the extended-timestamp to flash-player.
-    // @see: ngx_rtmp_prepare_message
-    // @see: http://blog.csdn.net/win_lin/article/details/13363699
-    // TODO: FIXME: extract to outer.
-    if (timestamp >= RTMP_EXTENDED_TIMESTAMP) {
-        pp = (char*)&timestamp;
-        *p++ = pp[3];
-        *p++ = pp[2];
-        *p++ = pp[1];
-        *p++ = pp[0];
-    }
-    
-    // always has header
-    *pnbh = p - cache;
-    *ph = cache;
+    return ret;
 }
 
 int SrsProtocol::do_decode_message(SrsMessageHeader& header, SrsStream* stream, SrsPacket** ppacket)
@@ -1842,7 +1785,7 @@ int SrsProtocol::on_recv_message(SrsCommonMessage* msg)
     return ret;
 }
 
-int SrsProtocol::on_send_packet(SrsSharedPtrMessage* msg, SrsPacket* packet)
+int SrsProtocol::on_send_packet(SrsMessageHeader* mh, SrsPacket* packet)
 {
     int ret = ERROR_SUCCESS;
     
@@ -1851,7 +1794,7 @@ int SrsProtocol::on_send_packet(SrsSharedPtrMessage* msg, SrsPacket* packet)
         return ret;
     }
     
-    switch (msg->header.message_type) {
+    switch (mh->message_type) {
         case RTMP_MSG_SetChunkSize: {
             SrsSetChunkSizePacket* pkt = dynamic_cast<SrsSetChunkSizePacket*>(packet);
             srs_assert(pkt != NULL);

@@ -56,6 +56,22 @@ class SrsChunkStream;
 class SrsSharedPtrMessage;
 class IMergeReadHandler;
 
+/****************************************************************************
+*****************************************************************************
+****************************************************************************/
+/**
+* 6.1. Chunk Format
+* Extended timestamp: 0 or 4 bytes
+* This field MUST be sent when the normal timsestamp is set to
+* 0xffffff, it MUST NOT be sent if the normal timestamp is set to
+* anything else. So for values less than 0xffffff the normal
+* timestamp field SHOULD be used in which case the extended timestamp
+* MUST NOT be present. For values greater than or equal to 0xffffff
+* the normal timestamp field MUST NOT be used and MUST be set to
+* 0xffffff and the extended timestamp MUST be sent.
+*/
+#define RTMP_EXTENDED_TIMESTAMP                 0xFFFFFF
+
 /**
 * 4.1. Message Header
 */
@@ -493,14 +509,10 @@ private:
     */
     virtual int do_send_and_free_packet(SrsPacket* packet, int stream_id);
     /**
-    * generate the chunk header for msg.
-    * @param mh, the header of msg to send.
-    * @param c0, whether the first chunk, the c0 chunk.
-    * @param pnbh, output the size of header.
-    * @param ph, output the header cache.
-    *       user should never free it, it's cached header.
+    * use simple algorithm to send the header and bytes.
+    * @remark, for do_send_and_free_packet to send.
     */
-    virtual void generate_chunk_header(char* cache, SrsMessageHeader* mh, bool c0, int* pnbh, char** ph);
+    virtual int do_simple_send(SrsMessageHeader* mh, char* payload, int size);
     /**
     * imp for decode_message
     */
@@ -534,7 +546,7 @@ private:
     /**
     * when message sentout, update the context.
     */
-    virtual int on_send_packet(SrsSharedPtrMessage* msg, SrsPacket* packet);
+    virtual int on_send_packet(SrsMessageHeader* mh, SrsPacket* packet);
 private:
     /**
     * auto response the ack message.

@@ -29,6 +29,7 @@ using namespace std;
 #include <srs_kernel_log.hpp>
 #include <srs_kernel_utility.hpp>
 #include <srs_kernel_stream.hpp>
+#include <srs_protocol_stack.hpp>
 
 void srs_discovery_tc_url(
     string tcUrl, 
@@ -203,3 +204,83 @@ bool srs_aac_startswith_adts(SrsStream* stream)
     return true;
 }
 
+int srs_chunk_header(char* cache, SrsMessageHeader* mh, bool c0) 
+{
+    // to directly set the field.
+    char* pp = NULL;
+    
+    // generate the header.
+    char* p = cache;
+    
+    // timestamp for c0/c3
+    u_int32_t timestamp = (u_int32_t)mh->timestamp;
+    
+    if (c0) {
+        // write new chunk stream header, fmt is 0
+        *p++ = 0x00 | (mh->perfer_cid & 0x3F);
+        
+        // chunk message header, 11 bytes
+        // timestamp, 3bytes, big-endian
+        if (timestamp < RTMP_EXTENDED_TIMESTAMP) {
+            pp = (char*)&timestamp;
+            *p++ = pp[2];
+            *p++ = pp[1];
+            *p++ = pp[0];
+        } else {
+            *p++ = 0xFF;
+            *p++ = 0xFF;
+            *p++ = 0xFF;
+        }
+        
+        // message_length, 3bytes, big-endian
+        pp = (char*)&mh->payload_length;
+        *p++ = pp[2];
+        *p++ = pp[1];
+        *p++ = pp[0];
+        
+        // message_type, 1bytes
+        *p++ = mh->message_type;
+        
+        // stream_id, 4bytes, little-endian
+        pp = (char*)&mh->stream_id;
+        *p++ = pp[0];
+        *p++ = pp[1];
+        *p++ = pp[2];
+        *p++ = pp[3];
+    } else {
+        // write no message header chunk stream, fmt is 3
+        // @remark, if perfer_cid > 0x3F, that is, use 2B/3B chunk header,
+        // SRS will rollback to 1B chunk header.
+        *p++ = 0xC0 | (mh->perfer_cid & 0x3F);
+    }
+    
+    // for c0
+    // chunk extended timestamp header, 0 or 4 bytes, big-endian
+    // 
+    // for c3:
+    // chunk extended timestamp header, 0 or 4 bytes, big-endian
+    // 6.1.3. Extended Timestamp
+    // This field is transmitted only when the normal time stamp in the
+    // chunk message header is set to 0x00ffffff. If normal time stamp is
+    // set to any value less than 0x00ffffff, this field MUST NOT be
+    // present. This field MUST NOT be present if the timestamp field is not
+    // present. Type 3 chunks MUST NOT have this field.
+    // adobe changed for Type3 chunk:
+    //        FMLE always sendout the extended-timestamp,
+    //        must send the extended-timestamp to FMS,
+    //        must send the extended-timestamp to flash-player.
+    // @see: ngx_rtmp_prepare_message
+    // @see: http://blog.csdn.net/win_lin/article/details/13363699
+    // TODO: FIXME: extract to outer.
+    if (timestamp >= RTMP_EXTENDED_TIMESTAMP) {
+        pp = (char*)&timestamp;
+        *p++ = pp[3];
+        *p++ = pp[2];
+        *p++ = pp[1];
+        *p++ = pp[0];
+    }
+    
+    // always has header
+    return p - cache;
+}
+

@@ -34,6 +34,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_kernel_consts.hpp>
 
 class SrsStream;
+class SrsMessageHeader;
 
 /**
 * parse the tcUrl, output the schema, host, vhost, app and port.
@@ -103,5 +104,13 @@ extern bool srs_avc_startswith_annexb(SrsStream* stream, int* pnb_start_code = N
 */
 extern bool srs_aac_startswith_adts(SrsStream* stream);
 
+/**
+* generate the chunk header for msg.
+* @param mh, the header of msg to send.
+* @param c0, whether the first chunk, the c0 chunk.
+* @return the size of header.
+*/
+extern int srs_chunk_header(char* cache, SrsMessageHeader* mh, bool c0);
+
 #endif