for bug #66, refine the api and demo.

@@ -37,26 +37,30 @@ 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** p, int fps,
+int read_h264_frame(char* data, int size, char** pp, int fps,
     char** frame, int* frame_size, int* dts, int* pts)
 {
+    char* p = *pp;
+    
     // @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;
     }
-    *p += pnb_start_code;
+    p += pnb_start_code;
     
-    *frame = *p;
-    for (;*p < data + size; *p = *p + 1) {
-        if (srs_h264_startswith_annexb(*p, size - (*p - data), &pnb_start_code)) {
+    *frame = p;
+    for (;p < data + size; p++) {
+        if (srs_h264_startswith_annexb(p, size - (p - data), &pnb_start_code)) {
             break;
         }
     }
-    *frame_size = *p - *frame;
+    
+    *pp = p;
+    *frame_size = p - *frame;
     if (*frame_size <= 0) {
         srs_trace("h264 raw data invalid.");
         return -1;
@@ -167,7 +171,7 @@ int main(int argc, char** argv)
         // 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, nut,
+            srs_type2string(SRS_RTMP_TYPE_VIDEO), dts, size, fps, (char)data[0],
             (nut == 7? "SPS":(nut == 8? "PPS":(nut == 5? "I":(nut == 1? "P":"Unknown")))));
         
         // @remark, when use encode device, it not need to sleep.

@@ -70,9 +70,6 @@ struct Context
     SimpleSocketStream* skt;
     int stream_id;
     
-    // for h264 raw stream
-    SrsStream raw_stream;
-    
     Context() {
         rtmp = NULL;
         skt = NULL;
@@ -1003,15 +1000,15 @@ int srs_write_h264_raw_frame(srs_rtmp_t rtmp, char* frame, int frame_size, u_int
 {
     int ret = ERROR_SUCCESS;
     
-    srs_assert(frame_size > 0);
+    srs_assert(frame_size > 1);
     
     srs_assert(rtmp != NULL);
     Context* context = (Context*)rtmp;
     
-    if ((ret = context->raw_stream.initialize(frame, frame_size)) != ERROR_SUCCESS) {
-        return ret;
-    }
-    
+    // 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
+    u_int8_t nal_unit_type = (char)frame[0] & 0x1f;
     
     /*// the timestamp in rtmp message header is dts.
     u_int32_t timestamp = dts;
@@ -1025,11 +1022,6 @@ int srs_write_h264_raw_frame(srs_rtmp_t rtmp, char* frame, int frame_size, u_int
     char* data = new char[size];
     memcpy(data + 5, h264_raw_data, h264_raw_size);
     
-    // 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
-    u_int8_t nal_unit_type = (char)h264_raw_data[0] & 0x1f;
-    
     // Frame Type, Type of video frame.
     // @see: E.4.3 Video Tags, video_file_format_spec_v10_1.pdf, page 78
     int8_t frame_type = SrsCodecVideoAVCFrameInterFrame;

@@ -337,11 +337,12 @@ extern char* srs_amf0_human_print(srs_amf0_t amf0, char** pdata, int* psize);
 **************************************************************
 *************************************************************/
 /**
-* write h.264 raw frame to rtmp server.
+* write h.264 raw frame over RTMP to rtmp server.
 * @param frame the input h264 raw data, an encoded h.264 I/P/B frame data.
-*       it must be prefixed by h.264 annexb format, by N[00] 00 00 01, where N>=0, 
-*       for instance, 00 00 00 01 67 42 80 29 95 A0 14 01 6E 40
-* @paam frame_size the size of h264 raw data. assert frame_size > 0.
+*       the frame without h.264 annexb header, by N[00] 00 00 01, where N>=0, 
+*       for instance, header(00 00 00 01) + frame(67 42 80 29 95 A0 14 01 6E 40)
+* @paam frame_size the size of h264 raw data. 
+*       assert frame_size > 1, at least has 1 bytes header.
 * @param dts the dts of h.264 raw data.
 * @param pts the pts of h.264 raw data.
 *