use send_min_interval for stream control. 2.0.183

@@ -342,6 +342,7 @@ Remark:
 
 ## History
 
+* v2.0, 2015-08-14, use send_min_interval for stream control. 2.0.183
 * v2.0, 2015-08-12, enable the SRS_PERF_TCP_NODELAY and add config tcp_nodelay. 2.0.182
 * v2.0, 2015-08-11, for [#442](https://github.com/simple-rtmp-server/srs/issues/442) support kickoff connected client. 2.0.181
 * v2.0, 2015-07-21, for [#169](https://github.com/simple-rtmp-server/srs/issues/169) support default values for transcode. 2.0.180

@@ -858,6 +858,27 @@ vhost min.delay.com {
     tcp_nodelay     on;
 }
 
+# the vhost to control the stream delivery feature
+vhost stream.control.com {
+    # @see vhost mrw.srs.com for detail.
+    min_latency     on;
+    mr {
+    enabled     off;
+    }
+    mw_latency      100;
+    # @see vhost min.delay.com
+    queue_length    10;
+    tcp_nodelay     on;
+    # the minimal packets send interval in ms,
+    # used to control the ndiff of stream by srs_rtmp_dump,
+    # for example, some device can only accept some stream which
+    # delivery packets in constant interval(not cbr).
+    # @remark 0 to disable the minimal interval.
+    # @remark >0 to make the srs to send message one by one.
+    # default: 0
+    send_min_interval   3;
+}
+
 # the vhost for antisuck.
 vhost refer.anti_suck.com {
     # the common refer for play and publish.

@@ -257,6 +257,7 @@ int main(int argc, char** argv)
     }
     
     u_int32_t pre_timestamp = 0;
+    int64_t pre_now = srs_utils_time_ms();
     for (;;) {
         int size;
         char type;
@@ -268,11 +269,12 @@ int main(int argc, char** argv)
             goto rtmp_destroy;
         }
         
-        if (srs_human_print_rtmp_packet2(type, timestamp, data, size, pre_timestamp) != 0) {
+        if (srs_human_print_rtmp_packet3(type, timestamp, data, size, pre_timestamp, pre_now) != 0) {
             srs_human_trace("print rtmp packet failed.");
             goto rtmp_destroy;
         }
         pre_timestamp = timestamp;
+        pre_now = srs_utils_time_ms();
         
         // we only write some types of messages to flv file.
         int is_flv_msg = type == SRS_RTMP_TYPE_AUDIO

@@ -757,6 +757,17 @@ int SrsConfig::reload_vhost(SrsConfDirective* old_root)
                 }
                 srs_trace("vhost %s reload mw success.", vhost.c_str());
             }
+            // smi(send_min_interval), only one per vhost
+            if (!srs_directive_equals(new_vhost->get("send_min_interval"), old_vhost->get("send_min_interval"))) {
+                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
+                    ISrsReloadHandler* subscribe = *it;
+                    if ((ret = subscribe->on_reload_vhost_smi(vhost)) != ERROR_SUCCESS) {
+                        srs_error("vhost %s notify subscribes smi failed. ret=%d", vhost.c_str(), ret);
+                        return ret;
+                    }
+                }
+                srs_trace("vhost %s reload smi success.", vhost.c_str());
+            }
             // min_latency, only one per vhost
             if (!srs_directive_equals(new_vhost->get("min_latency"), old_vhost->get("min_latency"))) {
                 for (it = subscribes.begin(); it != subscribes.end(); ++it) {
@@ -1750,7 +1761,7 @@ int SrsConfig::check_config()
                 && n != "time_jitter" && n != "mix_correct"
                 && n != "atc" && n != "atc_auto"
                 && n != "debug_srs_upnode"
-                && n != "mr" && n != "mw_latency" && n != "min_latency" && n != "tcp_nodelay"
+                && n != "mr" && n != "mw_latency" && n != "min_latency" && n != "tcp_nodelay" && n != "send_min_interval"
                 && n != "security" && n != "http_remux"
                 && n != "http" && n != "http_static"
                 && n != "hds"
@@ -2506,6 +2517,23 @@ bool SrsConfig::get_tcp_nodelay(string vhost)
     return SRS_CONF_PERFER_FALSE(conf->arg0());
 }
 
+int SrsConfig::get_send_min_interval(string vhost)
+{
+    static int DEFAULT = 0;
+    
+    SrsConfDirective* conf = get_vhost(vhost);
+    if (!conf) {
+        return DEFAULT;
+    }
+    
+    conf = conf->get("send_min_interval");
+    if (!conf || conf->arg0().empty()) {
+        return DEFAULT;
+    }
+    
+    return ::atoi(conf->arg0().c_str());
+}
+
 int SrsConfig::get_global_chunk_size()
 {
     SrsConfDirective* conf = root->get("chunk_size");

@@ -526,6 +526,10 @@ public:
      * whether enable tcp nodelay for all clients of vhost.
      */
     virtual bool                get_tcp_nodelay(std::string vhost);
+    /**
+     * the minimal send interval in ms.
+     */
+    virtual int                 get_send_min_interval(std::string vhost);
 private:
     /**
     * get the global chunk size.

@@ -170,6 +170,11 @@ int ISrsReloadHandler::on_reload_vhost_mw(string /*vhost*/)
     return ERROR_SUCCESS;
 }
 
+int ISrsReloadHandler::on_reload_vhost_smi(string /*vhost*/)
+{
+    return ERROR_SUCCESS;
+}
+
 int ISrsReloadHandler::on_reload_vhost_realtime(string /*vhost*/)
 {
     return ERROR_SUCCESS;

@@ -73,6 +73,7 @@ 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_smi(std::string vhost);
     virtual int on_reload_vhost_realtime(std::string vhost);
     virtual int on_reload_vhost_chunk_size(std::string vhost);
     virtual int on_reload_vhost_transcode(std::string vhost);

@@ -93,6 +93,7 @@ SrsRtmpConn::SrsRtmpConn(SrsServer* svr, st_netfd_t c)
     mw_sleep = SRS_PERF_MW_SLEEP;
     mw_enabled = false;
     realtime = SRS_PERF_MIN_LATENCY_ENABLED;
+    send_min_interval = 0;
     
     _srs_config->subscribe(this);
 }
@@ -247,6 +248,23 @@ int SrsRtmpConn::on_reload_vhost_mw(string vhost)
     return ret;
 }
 
+int SrsRtmpConn::on_reload_vhost_smi(string vhost)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if (req->vhost != vhost) {
+        return ret;
+    }
+    
+    int smi = _srs_config->get_send_min_interval(vhost);
+    if (smi != send_min_interval) {
+        srs_trace("apply smi %d=>%d", send_min_interval, smi);
+        send_min_interval = smi;
+    }
+    
+    return ret;
+}
+
 int SrsRtmpConn::on_reload_vhost_realtime(string vhost)
 {
     int ret = ERROR_SUCCESS;
@@ -589,10 +607,15 @@ int SrsRtmpConn::do_playing(SrsSource* source, SrsConsumer* consumer, SrsQueueRe
     // when mw_sleep changed, resize the socket send buffer.
     mw_enabled = true;
     change_mw_sleep(_srs_config->get_mw_sleep_ms(req->vhost));
+    // initialize the send_min_interval
+    send_min_interval = _srs_config->get_send_min_interval(req->vhost);
     
     // set the sock options.
     set_sock_options();
     
+    srs_trace("start play smi=%d, mw_sleep=%d, mw_enabled=%d, realtime=%d",
+        send_min_interval, mw_sleep, mw_enabled, realtime);
+    
     while (!disposed) {
         // collect elapse for pithy print.
         pprint->elapse();
@@ -641,7 +664,8 @@ int SrsRtmpConn::do_playing(SrsSource* source, SrsConsumer* consumer, SrsQueueRe
         
         // get messages from consumer.
         // each msg in msgs.msgs must be free, for the SrsMessageArray never free them.
-        int count = 0;
+        // @remark when enable send_min_interval, only fetch one message a time.
+        int count = send_min_interval? 1 : 0;
         if ((ret = consumer->dump_packets(&msgs, count)) != ERROR_SUCCESS) {
             srs_error("get messages from consumer failed. ret=%d", ret);
             return ret;
@@ -716,6 +740,11 @@ int SrsRtmpConn::do_playing(SrsSource* source, SrsConsumer* consumer, SrsQueueRe
                 return ret;
             }
         }
+        
+        // apply the minimal interval for delivery stream in ms.
+        if (send_min_interval > 0) {
+            st_usleep(send_min_interval * 1000);
+        }
     }
     
     return ret;

@@ -85,6 +85,8 @@ private:
     // for realtime
     // @see https://github.com/simple-rtmp-server/srs/issues/257
     bool realtime;
+    // the minimal interval in ms for delivery stream.
+    int send_min_interval;
 public:
     SrsRtmpConn(SrsServer* svr, st_netfd_t c);
     virtual ~SrsRtmpConn();
@@ -96,6 +98,7 @@ protected:
 public:
     virtual int on_reload_vhost_removed(std::string vhost);
     virtual int on_reload_vhost_mw(std::string vhost);
+    virtual int on_reload_vhost_smi(std::string vhost);
     virtual int on_reload_vhost_realtime(std::string vhost);
 // interface IKbpsDelta
 public:

@@ -301,7 +301,8 @@ int SrsMessageQueue::dump_packets(int max_count, SrsSharedPtrMessage** pmsgs, in
     }
     
     srs_assert(max_count > 0);
-    count = srs_min(max_count, nb_msgs);
+    // when count is 0, dumps all; otherwise, dumps no more than count.
+    count = srs_min(max_count, count? count : nb_msgs);
 
     SrsSharedPtrMessage** omsgs = msgs.data();
     for (int i = 0; i < count; i++) {

@@ -173,11 +173,12 @@ public:
     */
     virtual int enqueue(SrsSharedPtrMessage* msg, bool* is_overflow = NULL);
     /**
-    * get packets in consumer queue.
-    * @pmsgs SrsSharedPtrMessage*[], used to store the msgs, user must alloc it.
-    * @count the count in array, output param.
-    * @max_count the max count to dequeue, must be positive.
-    */
+     * get packets in consumer queue.
+     * @pmsgs SrsSharedPtrMessage*[], used to store the msgs, user must alloc it.
+     * @count the count in array, input and output param.
+     * @max_count the max count to dequeue, must be positive.
+     * @remark user can specifies the count to get specified msgs; 0 to get all if possible.
+     */
     virtual int dump_packets(int max_count, SrsSharedPtrMessage** pmsgs, int& count);
     /**
     * dumps packets to consumer, use specified args.
@@ -256,10 +257,11 @@ public:
     */
     virtual int enqueue(SrsSharedPtrMessage* shared_msg, bool atc, SrsRtmpJitterAlgorithm ag);
     /**
-    * get packets in consumer queue.
-    * @param msgs the msgs array to dump packets to send.
-    * @param count the count in array, output param.
-    */
+     * get packets in consumer queue.
+     * @param msgs the msgs array to dump packets to send.
+     * @param count the count in array, intput and output param.
+     * @remark user can specifies the count to get specified msgs; 0 to get all if possible.
+     */
     virtual int dump_packets(SrsMessageArray* msgs, int& count);
 #ifdef SRS_PERF_QUEUE_COND_WAIT
     /**

@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR       2
 #define VERSION_MINOR       0
-#define VERSION_REVISION    182
+#define VERSION_REVISION    183
 
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"

@@ -1915,8 +1915,7 @@ void srs_amf0_strict_array_append(srs_amf0_t amf0, srs_amf0_t value)
 
 int64_t srs_utils_time_ms()
 {
-    srs_update_system_time_ms();
-    return srs_get_system_time_ms();
+    return srs_update_system_time_ms();
 }
 
 int64_t srs_utils_send_bytes(srs_rtmp_t rtmp)
@@ -2321,6 +2320,11 @@ int srs_human_print_rtmp_packet(char type, u_int32_t timestamp, char* data, int
 
 int srs_human_print_rtmp_packet2(char type, u_int32_t timestamp, char* data, int size, u_int32_t pre_timestamp)
 {
+    return srs_human_print_rtmp_packet3(type, timestamp, data, size, pre_timestamp, 0);
+}
+    
+int srs_human_print_rtmp_packet3(char type, u_int32_t timestamp, char* data, int size, u_int32_t pre_timestamp, int64_t pre_now)
+{
     int ret = ERROR_SUCCESS;
     
     int diff = 0;
@@ -2328,24 +2332,29 @@ int srs_human_print_rtmp_packet2(char type, u_int32_t timestamp, char* data, int
         diff = (int)timestamp - (int)pre_timestamp;
     }
     
+    int ndiff = 0;
+    if (pre_now > 0) {
+        ndiff = (int)(srs_utils_time_ms() - pre_now);
+    }
+    
     u_int32_t pts;
     if (srs_utils_parse_timestamp(timestamp, type, data, size, &pts) != 0) {
-        srs_human_trace("Rtmp packet type=%s, dts=%d, diff=%d, size=%d, DecodeError",
-            srs_human_flv_tag_type2string(type), timestamp, diff, size
+        srs_human_trace("Rtmp packet type=%s, dts=%d, diff=%d, ndiff=%d, size=%d, DecodeError",
+            srs_human_flv_tag_type2string(type), timestamp, diff, ndiff, size
         );
         return ret;
     }
     
     if (type == SRS_RTMP_TYPE_VIDEO) {
-        srs_human_trace("Video packet type=%s, dts=%d, pts=%d, diff=%d, size=%d, %s(%s,%s)",
-            srs_human_flv_tag_type2string(type), timestamp, pts, diff, size,
+        srs_human_trace("Video packet type=%s, dts=%d, pts=%d, diff=%d, ndiff=%d, size=%d, %s(%s,%s)",
+            srs_human_flv_tag_type2string(type), timestamp, pts, diff, ndiff, size,
             srs_human_flv_video_codec_id2string(srs_utils_flv_video_codec_id(data, size)),
             srs_human_flv_video_avc_packet_type2string(srs_utils_flv_video_avc_packet_type(data, size)),
             srs_human_flv_video_frame_type2string(srs_utils_flv_video_frame_type(data, size))
         );
     } else if (type == SRS_RTMP_TYPE_AUDIO) {
-        srs_human_trace("Audio packet type=%s, dts=%d, pts=%d, diff=%d, size=%d, %s(%s,%s,%s,%s)",
-            srs_human_flv_tag_type2string(type), timestamp, pts, diff, size,
+        srs_human_trace("Audio packet type=%s, dts=%d, pts=%d, diff=%d, ndiff=%d, size=%d, %s(%s,%s,%s,%s)",
+            srs_human_flv_tag_type2string(type), timestamp, pts, diff, ndiff, size,
             srs_human_flv_audio_sound_format2string(srs_utils_flv_audio_sound_format(data, size)),
             srs_human_flv_audio_sound_rate2string(srs_utils_flv_audio_sound_rate(data, size)),
             srs_human_flv_audio_sound_size2string(srs_utils_flv_audio_sound_size(data, size)),
@@ -2353,8 +2362,8 @@ int srs_human_print_rtmp_packet2(char type, u_int32_t timestamp, char* data, int
             srs_human_flv_audio_aac_packet_type2string(srs_utils_flv_audio_aac_packet_type(data, size))
         );
     } else if (type == SRS_RTMP_TYPE_SCRIPT) {
-        srs_human_verbose("Data packet type=%s, time=%d, diff=%d, size=%d",
-        srs_human_flv_tag_type2string(type), timestamp, diff, size);
+        srs_human_verbose("Data packet type=%s, time=%d, diff=%d, ndiff=%d, size=%d",
+        srs_human_flv_tag_type2string(type), timestamp, diff, ndiff, size);
         int nparsed = 0;
         while (nparsed < size) {
             int nb_parsed_this = 0;
@@ -2370,8 +2379,8 @@ int srs_human_print_rtmp_packet2(char type, u_int32_t timestamp, char* data, int
             srs_freep(amf0_str);
         }
     } else {
-        srs_human_trace("Rtmp packet type=%#x, dts=%d, pts=%d, diff=%d, size=%d",
-            type, timestamp, pts, diff, size);
+        srs_human_trace("Rtmp packet type=%#x, dts=%d, pts=%d, diff=%d, ndiff=%d, size=%d",
+            type, timestamp, pts, diff, ndiff, size);
     }
     
     return ret;

@@ -904,6 +904,7 @@ extern const char* srs_human_flv_audio_aac_packet_type2string(char aac_packet_ty
  */
 extern int srs_human_print_rtmp_packet(char type, u_int32_t timestamp, char* data, int size);
 extern int srs_human_print_rtmp_packet2(char type, u_int32_t timestamp, char* data, int size, u_int32_t pre_timestamp);
+extern int srs_human_print_rtmp_packet3(char type, u_int32_t timestamp, char* data, int size, u_int32_t pre_timestamp, int64_t pre_now);
 
 // log to console, for use srs-librtmp application.
 extern const char* srs_human_format_time();