diff --git a/trunk/src/kernel/srs_kernel_ts.cpp b/trunk/src/kernel/srs_kernel_ts.cpp
index 5541923bc..c691e5175 100644
--- a/trunk/src/kernel/srs_kernel_ts.cpp
+++ b/trunk/src/kernel/srs_kernel_ts.cpp
@@ -810,6 +810,8 @@ SrsTsPacket* SrsTsPacket::create_pes_first(SrsTsContext* context,
     pkt->payload = pes;
     
     if (pcr >= 0) {
+        // Ignore coverage for PCR, we don't use it in HLS.
+        // LCOV_EXCL_START
         SrsTsAdaptationField* af = new SrsTsAdaptationField(pkt);
         pkt->adaptation_field = af;
         pkt->adaption_field_control = SrsTsAdaptationFieldTypeBoth;
@@ -825,6 +827,7 @@ SrsTsPacket* SrsTsPacket::create_pes_first(SrsTsContext* context,
         af->adaptation_field_extension_flag = 0;
         af->program_clock_reference_base = pcr;
         af->program_clock_reference_extension = 0;
+        // LCOV_EXCL_STOP
     }
     
     pes->packet_start_code_prefix = 0x01;
@@ -972,7 +975,9 @@ srs_error_t SrsTsAdaptationField::decode(SrsBuffer* stream)
         const1_value0 = (pcrv >> 9) & 0x3F;
         program_clock_reference_base = (pcrv >> 15) & 0x1ffffffffLL;
     }
-    
+
+    // Ignore coverage for bellow, we don't use it in HLS.
+    // LCOV_EXCL_START
     if (OPCR_flag) {
         if (!stream->require(6)) {
             return srs_error_new(ERROR_STREAM_CASTER_TS_AF, "ts: demux af OPCR_flag");
@@ -1080,6 +1085,7 @@ srs_error_t SrsTsAdaptationField::decode(SrsBuffer* stream)
         nb_af_ext_reserved = adaptation_field_extension_length - (stream->pos() - pos_af_ext);
         stream->skip(nb_af_ext_reserved);
     }
+    // LCOV_EXCL_STOP
     
     nb_af_reserved = adaption_field_length - (stream->pos() - pos_af);
     stream->skip(nb_af_reserved);
@@ -1143,7 +1149,9 @@ srs_error_t SrsTsAdaptationField::encode(SrsBuffer* stream)
     tmpv |= (splicing_point_flag << 2) & 0x04;
     tmpv |= (transport_private_data_flag << 1) & 0x02;
     stream->write_1bytes(tmpv);
-    
+
+    // Ignore the coverage bellow, for we don't use them in HLS.
+    // LCOV_EXCL_START
     if (PCR_flag) {
         if (!stream->require(6)) {
             return srs_error_new(ERROR_STREAM_CASTER_TS_AF, "ts: mux af PCR_flag");
@@ -1236,6 +1244,7 @@ srs_error_t SrsTsAdaptationField::encode(SrsBuffer* stream)
             stream->skip(nb_af_ext_reserved);
         }
     }
+    // LCOV_EXCL_STOP
     
     if (nb_af_reserved) {
         stream->skip(nb_af_reserved);
@@ -1460,7 +1469,10 @@ srs_error_t SrsTsPayloadPES::decode(SrsBuffer* stream, SrsTsMessage** ppmsg)
                 msg->dts = dts;
                 msg->pts = pts;
             }
-            
+
+            // Ignore coverage bellow, for we don't use them in HLS.
+            // LCOV_EXCL_START
+
             // 6B
             if (ESCR_flag) {
                 ESCR_extension = 0;
@@ -1588,6 +1600,8 @@ srs_error_t SrsTsPayloadPES::decode(SrsBuffer* stream, SrsTsMessage** ppmsg)
                 }
                 stream->skip(nb_stuffings);
             }
+
+            // LCOV_EXCL_STOP
             
             // PES_packet_data_byte, page58.
             // the packet size contains the header size.
@@ -1610,6 +1624,9 @@ srs_error_t SrsTsPayloadPES::decode(SrsBuffer* stream, SrsTsMessage** ppmsg)
             if ((err = msg->dump(stream, &nb_bytes)) != srs_success) {
                 return srs_error_wrap(err, "dump pes");
             }
+
+            // Ignore coverage bellow, for we don't use them in HLS.
+            // LCOV_EXCL_START
         } else if (sid == SrsTsPESStreamIdProgramStreamMap
                    || sid == SrsTsPESStreamIdPrivateStream2
                    || sid == SrsTsPESStreamIdEcmStream
@@ -1633,6 +1650,8 @@ srs_error_t SrsTsPayloadPES::decode(SrsBuffer* stream, SrsTsMessage** ppmsg)
             nb_paddings = stream->size() - stream->pos();
             stream->skip(nb_paddings);
             srs_info("ts: drop %dB padding bytes", nb_paddings);
+
+            // LCOV_EXCL_STOP
         } else {
             int nb_drop = stream->size() - stream->pos();
             stream->skip(nb_drop);
@@ -1685,13 +1704,16 @@ int SrsTsPayloadPES::size()
         sz += additional_copy_info_flag? 1:0;
         sz += PES_CRC_flag? 2:0;
         sz += PES_extension_flag? 1:0;
-        
+
         if (PES_extension_flag) {
+            // Ignore coverage bellow, for we don't use them in HLS.
+            // LCOV_EXCL_START
             sz += PES_private_data_flag? 16:0;
             sz += pack_header_field_flag ? 1 + pack_field.size() : 0; // 1+x bytes.
             sz += program_packet_sequence_counter_flag? 2:0;
             sz += P_STD_buffer_flag? 2:0;
             sz += PES_extension_flag_2 ? 1 + PES_extension_field.size() : 0; // 1+x bytes.
+            // LCOV_EXCL_STOP
         }
         PES_header_data_length = sz - PES_header_data_length;
         
@@ -1802,6 +1824,9 @@ srs_error_t SrsTsPayloadPES::encode(SrsBuffer* stream)
             srs_warn("ts: sync dts=%" PRId64 ", pts=%" PRId64, dts, pts);
         }
     }
+
+    // Ignore coverage bellow, for we don't use them in HLS.
+    // LCOV_EXCL_START
     
     // 6B
     if (ESCR_flag) {
@@ -1861,6 +1886,8 @@ srs_error_t SrsTsPayloadPES::encode(SrsBuffer* stream)
         stream->skip(nb_stuffings);
         srs_warn("ts: demux PES, ignore the stuffings.");
     }
+
+    // LCOV_EXCL_STOP
     
     return err;
 }