refine for bug#66, implements the usage.

@@ -37,7 +37,7 @@ gcc srs_h264_raw_publish.c ../../objs/lib/srs_librtmp.a -g -O0 -lstdc++ -o srs_h
 
 #define srs_trace(msg, ...) printf(msg, ##__VA_ARGS__);printf("\n")
 
-int read_h264_frame(char* data, int size, char** pp, int fps,
+int read_h264_frame(char* data, int size, char** pp, int* pnb_start_code, int fps,
     char** frame, int* frame_size, int* dts, int* pts)
 {
     char* p = *pp;
@@ -45,8 +45,7 @@ int read_h264_frame(char* data, int size, char** pp, int fps,
     // @remark, for this demo, to publish h264 raw file to SRS,
     // we search the h264 frame from the buffer which cached the h264 data.
     // please get h264 raw data from device, it always a encoded frame.
-    int pnb_start_code = 0;
-    if (!srs_h264_startswith_annexb(p, size - (p - data), &pnb_start_code)) {
+    if (!srs_h264_startswith_annexb(p, size - (p - data), pnb_start_code)) {
         srs_trace("h264 raw data invalid.");
         return -1;
     }
@@ -55,10 +54,10 @@ int read_h264_frame(char* data, int size, char** pp, int fps,
     // each frame prefixed h.264 annexb header, by N[00] 00 00 01, where N>=0, 
     // for instance, frame = header(00 00 00 01) + payload(67 42 80 29 95 A0 14 01 6E 40)
     *frame = p;
-    p += pnb_start_code;
+    p += *pnb_start_code;
     
     for (;p < data + size; p++) {
-        if (srs_h264_startswith_annexb(p, size - (p - data), &pnb_start_code)) {
+        if (srs_h264_startswith_annexb(p, size - (p - data), NULL)) {
             break;
         }
     }
@@ -160,7 +159,10 @@ int main(int argc, char** argv)
         // @remark, read a frame from file buffer.
         char* data = NULL;
         int size = 0;
-        if (read_h264_frame(h264_raw, file_size, &p, fps, &data, &size, &dts, &pts) < 0) {
+        int nb_start_code = 0;
+        if (read_h264_frame(h264_raw, file_size, &p, &nb_start_code, fps, 
+            &data, &size, &dts, &pts) < 0
+        ) {
             srs_trace("read a frame from file buffer failed.");
             goto rtmp_destroy;
         }
@@ -173,9 +175,9 @@ int main(int argc, char** argv)
         
         // 5bits, 7.3.1 NAL unit syntax, 
         // H.264-AVC-ISO_IEC_14496-10.pdf, page 44.
-        u_int8_t nut = (char)data[0] & 0x1f;
-        srs_trace("sent packet: type=%s, time=%d, size=%d, fps=%d, b[0]=%#x(%s)", 
-            srs_type2string(SRS_RTMP_TYPE_VIDEO), dts, size, fps, (char)data[0],
+        u_int8_t nut = (char)data[nb_start_code] & 0x1f;
+        srs_trace("sent packet: type=%s, time=%d, size=%d, fps=%d, b[%d]=%#x(%s)", 
+            srs_type2string(SRS_RTMP_TYPE_VIDEO), dts, size, fps, nb_start_code, (char)data[nb_start_code],
             (nut == 7? "SPS":(nut == 8? "PPS":(nut == 5? "I":(nut == 1? "P":"Unknown")))));
         
         // @remark, when use encode device, it not need to sleep.

@@ -531,7 +531,7 @@ int SrsAvcAacCodec::avc_demux_annexb_format(SrsStream* stream, SrsCodecSample* s
         
         // get the last matched NALU
         while (!stream->empty()) {
-            if (srs_avc_startswith_annexb(stream, &nb_start_code)) {
+            if (srs_avc_startswith_annexb(stream, NULL)) {
                 break;
             }
             

@@ -184,6 +184,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_KERNEL_STREAM_INIT            3038
 #define ERROR_EDGE_VHOST_REMOVED            3039
 #define ERROR_HLS_AVC_TRY_OTHERS            3040
+#define ERROR_H264_API_NO_PREFIXED          3041
 
 /**
 * whether the error code is an system control error.

@@ -70,6 +70,10 @@ struct Context
     SimpleSocketStream* skt;
     int stream_id;
     
+    // for h264 raw stream, 
+    // see: https://github.com/winlinvip/simple-rtmp-server/issues/66#issuecomment-62240521
+    SrsStream raw_stream;
+    
     Context() {
         rtmp = NULL;
         skt = NULL;
@@ -995,15 +999,6 @@ char* srs_amf0_human_print(srs_amf0_t amf0, char** pdata, int* psize)
     
     return any->human_print(pdata, psize);
 }
-
-int srs_write_h264_raw_frames(srs_rtmp_t rtmp, char* frames, int frames_size, u_int32_t dts, u_int32_t pts)
-{
-    int ret = ERROR_SUCCESS;
-    
-    srs_assert(frames_size > 1);
-    
-    srs_assert(rtmp != NULL);
-    Context* context = (Context*)rtmp;
     
     /*// 5bits, 7.3.1 NAL unit syntax, 
     // H.264-AVC-ISO_IEC_14496-10.pdf, page 44.
@@ -1051,6 +1046,52 @@ int srs_write_h264_raw_frames(srs_rtmp_t rtmp, char* frames, int frames_size, u_
     *p++ = pp[2];
     *p++ = pp[1];
     *p++ = pp[0];*/
+
+int srs_write_h264_raw_frame(Context* context, char* frame, int frame_size, u_int32_t dts, u_int32_t pts)
+{
+    int ret = ERROR_SUCCESS;
+    return ret;
+}
+
+int srs_write_h264_raw_frames(srs_rtmp_t rtmp, char* frames, int frames_size, u_int32_t dts, u_int32_t pts)
+{
+    int ret = ERROR_SUCCESS;
+    
+    srs_assert(frames_size > 1);
+    
+    srs_assert(rtmp != NULL);
+    Context* context = (Context*)rtmp;
+    
+    if ((ret = context->raw_stream.initialize(frames, frames_size)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    // send each frame.
+    while (!context->raw_stream.empty()) {
+        // each frame must prefixed by annexb format.
+        // about annexb, @see H.264-AVC-ISO_IEC_14496-10.pdf, page 211.
+        int pnb_start_code = 0;
+        if (!srs_avc_startswith_annexb(&context->raw_stream, &pnb_start_code)) {
+            return ERROR_H264_API_NO_PREFIXED;
+        }
+        int start = context->raw_stream.pos() + pnb_start_code;
+        
+        // find the last frame prefixed by annexb format.
+        context->raw_stream.skip(pnb_start_code);
+        while (!context->raw_stream.empty()) {
+            if (srs_avc_startswith_annexb(&context->raw_stream, NULL)) {
+                break;
+            }
+            context->raw_stream.skip(1);
+        }
+        int size = context->raw_stream.pos() - start;
+        
+        // send out the frame.
+        char* frame = context->raw_stream.data() + start;
+        if ((ret = srs_write_h264_raw_frame(context, frame, size, dts, pts)) != ERROR_SUCCESS) {
+            return ret;
+        }
+    }
     
     return ret;
 }

@@ -342,6 +342,7 @@ extern char* srs_amf0_human_print(srs_amf0_t amf0, char** pdata, int* psize);
 *       frames can be one or more than one frame,
 *       each frame prefixed h.264 annexb header, by N[00] 00 00 01, where N>=0, 
 *       for instance, frame = header(00 00 00 01) + payload(67 42 80 29 95 A0 14 01 6E 40)
+*       about annexb, @see H.264-AVC-ISO_IEC_14496-10.pdf, page 211.
 * @paam frames_size the size of h264 raw data. 
 *       assert frames_size > 1, at least has 1 bytes header.
 * @param dts the dts of h.264 raw data.