fix #203, srs-librtmp drop any video before sps/pps(sequence header). 2.0.21.

@@ -244,6 +244,7 @@ Supported operating systems and hardware:
 * 2013-10-17, Created.<br/>
 
 ## History
+* v2.0, 2014-11-15, fix [#203](https://github.com/winlinvip/simple-rtmp-server/issues/203), srs-librtmp drop any video before sps/pps(sequence header). 2.0.21.
 * v2.0, 2014-11-15, fix [#202](https://github.com/winlinvip/simple-rtmp-server/issues/202), fix memory leak of h.264 raw packet send in srs-librtmp. 2.0.20.
 * v2.0, 2014-11-13, fix [#200](https://github.com/winlinvip/simple-rtmp-server/issues/200), deadloop when read/write 0 and ETIME. 2.0.16.
 * v2.0, 2014-11-13, fix [#194](https://github.com/winlinvip/simple-rtmp-server/issues/194), writev multiple msgs, support 6k+ 250kbps clients. 2.0.15.

@@ -166,9 +166,14 @@ int main(int argc, char** argv)
         }
         
         // send out the h264 packet over RTMP
-        if (srs_write_h264_raw_frames(rtmp, data, size, dts, pts) != 0) {
-            srs_lib_trace("send h264 raw data failed.");
-            goto rtmp_destroy;
+        int error = srs_h264_write_raw_frames(rtmp, data, size, dts, pts);
+        if (error != 0) {
+            if (srs_h264_is_dvbsp_error(error)) {
+                srs_lib_trace("ignore drop video error, code=%d", error);
+            } else {
+                srs_lib_trace("send h264 raw data failed.");
+                goto rtmp_destroy;
+            }
         }
         
         // 5bits, 7.3.1 NAL unit syntax, 

@@ -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    20
+#define VERSION_REVISION    21
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"
 #define RTMP_SIG_SRS_ROLE "origin/edge server"

@@ -186,6 +186,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_HLS_AVC_TRY_OTHERS            3040
 #define ERROR_H264_API_NO_PREFIXED          3041
 #define ERROR_FLV_INVALID_VIDEO_TAG         3042
+#define ERROR_H264_DROP_BEFORE_SPS_PPS      3043
 
 /**
 * whether the error code is an system control error.

@@ -76,11 +76,15 @@ struct Context
     // about SPS, @see: 7.3.2.1.1, H.264-AVC-ISO_IEC_14496-10-2012.pdf, page 62
     std::string h264_sps;
     std::string h264_pps;
+    // whether the sps and pps sent,
+    // @see https://github.com/winlinvip/simple-rtmp-server/issues/203
+    bool h264_sps_pps_sent;
     
     Context() {
         rtmp = NULL;
         skt = NULL;
         stream_id = 0;
+        h264_sps_pps_sent = false;
     }
     virtual ~Context() {
         srs_freep(rtmp);
@@ -1205,6 +1209,7 @@ int __srs_write_h264_sps_pps(Context* context, u_int32_t dts, u_int32_t pts)
     // reset sps and pps.
     context->h264_pps = "";
     context->h264_sps = "";
+    context->h264_sps_pps_sent = true;
     
     // TODO: FIXME: for more profile.
     // 5.3.4.2.1 Syntax, H.264-AVC-ISO_IEC_14496-15.pdf, page 16
@@ -1227,6 +1232,12 @@ int __srs_write_h264_ipb_frame(Context* context,
 ) {
     int ret = ERROR_SUCCESS;
     
+    // when sps or pps not sent, ignore the packet.
+    // @see https://github.com/winlinvip/simple-rtmp-server/issues/203
+    if (!context->h264_sps_pps_sent) {
+        return ERROR_H264_DROP_BEFORE_SPS_PPS;
+    }
+    
     // 5bits, 7.3.1 NAL unit syntax, 
     // H.264-AVC-ISO_IEC_14496-10.pdf, page 44.
     //  7: SPS, 8: PPS, 5: I Frame, 1: P Frame
@@ -1315,7 +1326,7 @@ int __srs_write_h264_raw_frame(Context* context,
 /**
 * write h264 multiple frames, in annexb format.
 */
-int srs_write_h264_raw_frames(srs_rtmp_t rtmp, 
+int srs_h264_write_raw_frames(srs_rtmp_t rtmp, 
     char* frames, int frames_size, u_int32_t dts, u_int32_t pts
 ) {
     int ret = ERROR_SUCCESS;
@@ -1360,6 +1371,11 @@ int srs_write_h264_raw_frames(srs_rtmp_t rtmp,
     return ret;
 }
 
+srs_h264_bool srs_h264_is_dvbsp_error(int error_code)
+{
+    return error_code == ERROR_H264_DROP_BEFORE_SPS_PPS;
+}
+
 int srs_h264_startswith_annexb(char* h264_raw_data, int h264_raw_size, int* pnb_start_code)
 {
     SrsStream stream;

@@ -424,6 +424,7 @@ extern char* srs_amf0_human_print(srs_amf0_t amf0, char** pdata, int* psize);
 * h264 raw codec
 **************************************************************
 *************************************************************/
+typedef int srs_h264_bool;
 /**
 * write h.264 raw frame over RTMP to rtmp server.
 * @param frames the input h264 raw data, encoded h.264 I/P/B frames data.
@@ -441,8 +442,10 @@ extern char* srs_amf0_human_print(srs_amf0_t amf0, char** pdata, int* psize);
 * @remark, cts = pts - dts
 * @remark, use srs_h264_startswith_annexb to check whether frame is annexb format.
 * @example /trunk/research/librtmp/srs_h264_raw_publish.c
+* @see https://github.com/winlinvip/simple-rtmp-server/issues/66
 * 
 * @return 0, success; otherswise, failed.
+*       for dvbsp error, check by srs_h264_is_dvbsp_error(error_code).
 */
 /**
 For the example file: 
@@ -458,25 +461,36 @@ The data sequence is:
     0000000141E02041F8CDDC562BBDEFAD2F.....
 User can send the SPS+PPS, then each frame:
     // SPS+PPS
-    srs_write_h264_raw_frame('000000016742802995A014016E400000000168CE3880', size, dts, pts)
+    srs_h264_write_raw_frames('000000016742802995A014016E400000000168CE3880', size, dts, pts)
     // IFrame
-    srs_write_h264_raw_frame('0000000165B8041014C038008B0D0D3A071......', size, dts, pts)
+    srs_h264_write_raw_frames('0000000165B8041014C038008B0D0D3A071......', size, dts, pts)
     // PFrame
-    srs_write_h264_raw_frame('0000000141E02041F8CDDC562BBDEFAD2F......', size, dts, pts)
+    srs_h264_write_raw_frames('0000000141E02041F8CDDC562BBDEFAD2F......', size, dts, pts)
 User also can send one by one:
     // SPS
-    srs_write_h264_raw_frame('000000016742802995A014016E4', size, dts, pts)
+    srs_h264_write_raw_frames('000000016742802995A014016E4', size, dts, pts)
     // PPS
-    srs_write_h264_raw_frame('00000000168CE3880', size, dts, pts)
+    srs_h264_write_raw_frames('00000000168CE3880', size, dts, pts)
     // IFrame
-    srs_write_h264_raw_frame('0000000165B8041014C038008B0D0D3A071......', size, dts, pts)
+    srs_h264_write_raw_frames('0000000165B8041014C038008B0D0D3A071......', size, dts, pts)
     // PFrame
-    srs_write_h264_raw_frame('0000000141E02041F8CDDC562BBDEFAD2F......', size, dts, pts) 
+    srs_h264_write_raw_frames('0000000141E02041F8CDDC562BBDEFAD2F......', size, dts, pts) 
 */
-extern int srs_write_h264_raw_frames(srs_rtmp_t rtmp, 
+extern int srs_h264_write_raw_frames(srs_rtmp_t rtmp, 
     char* frames, int frames_size, u_int32_t dts, u_int32_t pts
 );
 /**
+* whether error_code is dvbsp(drop video before sps/pps/sequence-header) error.
+*
+* @see https://github.com/winlinvip/simple-rtmp-server/issues/203
+* @example /trunk/research/librtmp/srs_h264_raw_publish.c
+* @remark why drop video?
+*       some encoder, for example, ipcamera, will send sps/pps before each IFrame,
+*       so, when error and reconnect the rtmp, the first video is not sps/pps(sequence header),
+*       this will cause SRS server to disable HLS.
+*/
+extern srs_h264_bool srs_h264_is_dvbsp_error(int error_code);
+/**
 * whether h264 raw data starts with the annexb,
 * which bytes sequence matches N[00] 00 00 01, where N>=0.
 * @param h264_raw_data the input h264 raw data, a encoded h.264 I/P/B frame data.