for bug #241, change buffer size when chunk size changed.

@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // when we read from socket less than this value,
 // sleep a while to merge read.
 // @see https://github.com/winlinvip/simple-rtmp-server/issues/241
-#define SRS_MERGED_READ_SIZE (SOCKET_READ_SIZE / 10)
+#define SRS_MERGED_READ_SIZE(buffer) (buffer / 10)
 // the time to sleep to merge read, to read more bytes.
 #define SRS_MERGED_READ_US (300 * 1000)
 
@@ -334,7 +334,7 @@ void SrsPublishRecvThread::on_recv_error(int ret)
     st_cond_signal(error);
 }
 
-void SrsPublishRecvThread::on_read(ssize_t nread)
+void SrsPublishRecvThread::on_read(int nb_buffer, ssize_t nread)
 {
     if (nread < 0) {
         return;
@@ -346,7 +346,7 @@ void SrsPublishRecvThread::on_read(ssize_t nread)
     * that is, we merge some data to read together.
     * @see https://github.com/winlinvip/simple-rtmp-server/issues/241
     */
-    if (nread < SRS_MERGED_READ_SIZE) {
+    if (nread < SRS_MERGED_READ_SIZE(nb_buffer)) {
         st_usleep(SRS_MERGED_READ_US);
     }
 }

@@ -173,7 +173,7 @@ public:
     virtual void on_recv_error(int ret);
 // interface IMergeReadHandler
 public:
-    virtual void on_read(ssize_t nread);
+    virtual void on_read(int nb_buffer, ssize_t nread);
 };
 
 #endif

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 3.1.1, 2014-12-01T23:49:21. -->
 <qtcreator>
  <data>
   <variable>ProjectExplorer.Project.ActiveTarget</variable>

@@ -26,6 +26,14 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_kernel_error.hpp>
 #include <srs_kernel_log.hpp>
 
+// 4KB=4096
+// 8KB=8192
+// 16KB=16384
+// 32KB=32768
+// 64KB=65536
+// @see https://github.com/winlinvip/simple-rtmp-server/issues/241
+#define SOCKET_READ_SIZE 4096
+
 IMergeReadHandler::IMergeReadHandler()
 {
 }
@@ -39,7 +47,8 @@ SrsBuffer::SrsBuffer()
     merged_read = false;
     _handler = NULL;
     
-    buffer = new char[SOCKET_READ_SIZE];
+    nb_buffer = SOCKET_READ_SIZE;
+    buffer = new char[nb_buffer];
 }
 
 SrsBuffer::~SrsBuffer()
@@ -92,7 +101,7 @@ int SrsBuffer::grow(ISrsBufferReader* reader, int required_size)
 
     while (length() < required_size) {
         ssize_t nread;
-        if ((ret = reader->read(buffer, SOCKET_READ_SIZE, &nread)) != ERROR_SUCCESS) {
+        if ((ret = reader->read(buffer, nb_buffer, &nread)) != ERROR_SUCCESS) {
             return ret;
         }
         
@@ -103,7 +112,7 @@ int SrsBuffer::grow(ISrsBufferReader* reader, int required_size)
         * @see https://github.com/winlinvip/simple-rtmp-server/issues/241
         */
         if (merged_read && _handler) {
-            _handler->on_read(nread);
+            _handler->on_read(nb_buffer, nread);
         }
         
         srs_assert((int)nread > 0);
@@ -119,4 +128,21 @@ void SrsBuffer::set_merge_read(bool v, IMergeReadHandler* handler)
     _handler = handler;
 }
 
+void SrsBuffer::on_chunk_size(int32_t chunk_size)
+{
+    if (nb_buffer >= chunk_size) {
+        return;
+    }
+
+    srs_freep(buffer);
+
+    nb_buffer = chunk_size;
+    buffer = new char[nb_buffer];
+}
+
+int SrsBuffer::buffer_size()
+{
+    return nb_buffer;
+}
+
 

@@ -34,14 +34,6 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_protocol_io.hpp>
 
-// 4KB=4096
-// 8KB=8192
-// 16KB=16384
-// 32KB=32768
-// 64KB=65536
-// @see https://github.com/winlinvip/simple-rtmp-server/issues/241
-#define SOCKET_READ_SIZE 4096
-
 /**
 * to improve read performance, merge some packets then read,
 * when it on and read small bytes, we sleep to wait more data.,
@@ -59,7 +51,7 @@ public:
     * some small bytes.
     * @remark, it only for server-side, client srs-librtmp just ignore.
     */
-    virtual void on_read(ssize_t nread) = 0;
+    virtual void on_read(int nb_buffer, ssize_t nread) = 0;
 };
 
 /**
@@ -75,6 +67,7 @@ private:
     // data and socket buffer
     std::vector<char> data;
     char* buffer;
+    int nb_buffer;
 public:
     SrsBuffer();
     virtual ~SrsBuffer();
@@ -121,6 +114,17 @@ public:
     * @see https://github.com/winlinvip/simple-rtmp-server/issues/241
     */
     virtual void set_merge_read(bool v, IMergeReadHandler* handler);
+public:
+    /**
+    * when chunk size changed, the buffer should change the buffer also.
+    * to keep the socket buffer size always greater than chunk size.
+    * @see https://github.com/winlinvip/simple-rtmp-server/issues/241
+    */
+    virtual void on_chunk_size(int32_t chunk_size);
+    /**
+    * get the size of socket buffer to read.
+    */
+    virtual int buffer_size();
 };
 
 #endif

@@ -1689,9 +1689,12 @@ int SrsProtocol::on_recv_message(SrsMessage* msg)
                     SRS_CONSTS_RTMP_MAX_CHUNK_SIZE);
             }
 
+            int sock_buffer = in_buffer->buffer_size();
             in_chunk_size = pkt->chunk_size;
+            in_buffer->on_chunk_size(pkt->chunk_size);
+            srs_trace("input chunk size to %d, sock buf %d=>%d",
+                pkt->chunk_size, sock_buffer, in_buffer->buffer_size());
 
-            srs_trace("input chunk size to %d", pkt->chunk_size);
             break;
         }
         case RTMP_MSG_UserControlMessage: {