added python+cheetah build requirement, generating vrt.cpp

3 files changed, 47 insertions, 551 deletions

diff --git a/host/lib/CMakeLists.txt b/host/lib/CMakeLists.txt
index f21a4a491..87e35f412 100644
--- a/host/lib/CMakeLists.txt
+++ b/host/lib/CMakeLists.txt
@@ -15,6 +15,33 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 
+
+########################################################################
+# Setup Python
+########################################################################
+INCLUDE(FindPythonInterp)
+
+MACRO(PYTHON_CHECK_MODULE module have)
+    MESSAGE(STATUS "Checking for python module ${module}")
+    EXECUTE_PROCESS(
+        COMMAND ${PYTHON_EXECUTABLE} -c "import ${module}"
+        RESULT_VARIABLE ${have}
+    )
+    IF(${have} EQUAL 0)
+        MESSAGE(STATUS "Checking for python module ${module} - found")
+        SET(${have} TRUE)
+    ELSE(${have} EQUAL 0)
+        MESSAGE(STATUS "Checking for python module ${module} - not found")
+        SET(${have} FALSE)
+    ENDIF(${have} EQUAL 0)
+ENDMACRO(PYTHON_CHECK_MODULE)
+
+PYTHON_CHECK_MODULE("Cheetah" HAVE_PYTHON_MODULE_CHEETAH)
+
+IF(NOT HAVE_PYTHON_MODULE_CHEETAH)
+    MESSAGE(FATAL_ERROR "Error: Cheetah Templates needed for pre-build generation.")
+ENDIF(NOT HAVE_PYTHON_MODULE_CHEETAH)
+
 ########################################################################
 # Create a list of libuhd sources
 ########################################################################
@@ -26,7 +53,6 @@ SET(libuhd_sources
     wax.cpp
     transport/if_addrs.cpp
     transport/udp_simple.cpp
-    transport/vrt.cpp
     usrp/dboard/db_basic_and_lf.cpp
     usrp/dboard/db_rfx.cpp
     usrp/dboard_base.cpp
@@ -42,6 +68,24 @@ SET(libuhd_sources
 )
 
 ########################################################################
+# Generate Files
+########################################################################
+MACRO(UHD_PYTHON_GEN_FILE pyfile outfile)
+    ADD_CUSTOM_COMMAND(
+        OUTPUT ${outfile} DEPENDS ${pyfile}
+        COMMAND ${PYTHON_EXECUTABLE} ${pyfile} ${outfile}
+        COMMENT "Calling ${pyfile} to generate ${outfile}"
+    )
+ENDMACRO(UHD_PYTHON_GEN_FILE)
+UHD_PYTHON_GEN_FILE(
+    ${CMAKE_CURRENT_SOURCE_DIR}/transport/gen_vrt.py
+    ${CMAKE_CURRENT_BINARY_DIR}/transport/vrt.cpp
+)
+LIST(APPEND libuhd_sources
+    ${CMAKE_CURRENT_BINARY_DIR}/transport/vrt.cpp
+)
+
+########################################################################
 # Conditionally add the udp sources
 ########################################################################
 LIST(APPEND libuhd_sources
diff --git a/host/lib/transport/gen_vrt.py b/host/lib/transport/gen_vrt.py
index bc6635d78..0f961efc2 100755
--- a/host/lib/transport/gen_vrt.py
+++ b/host/lib/transport/gen_vrt.py
@@ -200,9 +200,10 @@ void vrt::unpack(
 }
 """
 
+import sys
 from Cheetah import Template
 def parse_str(_tmpl_text, **kwargs): return str(Template.Template(_tmpl_text, kwargs))
 
 if __name__ == '__main__':
     from Cheetah import Template
-    print parse_str(TMPL_TEXT, file=__file__)
+    open(sys.argv[1], 'w').write(parse_str(TMPL_TEXT, file=__file__))
diff --git a/host/lib/transport/vrt.cpp b/host/lib/transport/vrt.cpp
deleted file mode 100644
index 78c3cf2cb..000000000
--- a/host/lib/transport/vrt.cpp
+++ /dev/null
@@ -1,549 +0,0 @@
-
-
-
-/***********************************************************************
- * This file was generated by gen_vrt.py on 04/08/10 10:55:26
- **********************************************************************/
-
-#include <uhd/transport/vrt.hpp>
-#include <boost/asio.hpp> //endianness conversion
-#include <stdexcept>
-
-using namespace uhd;
-using namespace uhd::transport;
-
-void vrt::pack(
-    const tx_metadata_t &metadata, //input
-    boost::uint32_t *header_buff,  //output
-    size_t &num_header_words32,    //output
-    size_t num_payload_words32,    //input
-    size_t &num_packet_words32,    //output
-    size_t packet_count,           //input
-    double tick_rate               //input
-){
-    boost::uint32_t vrt_hdr_flags;
-
-    boost::uint8_t pred = 0;
-    if (metadata.has_stream_id) pred |= 0x1;
-    if (metadata.has_time_spec) pred |= 0xc;
-
-    switch(pred){
-    case 0:
-            num_header_words32 = 1;
-            num_packet_words32 = 1 + num_payload_words32;
-            vrt_hdr_flags = 0x0;
-        break;
-    case 1:
-            header_buff[1] = htonl(metadata.stream_id);
-            num_header_words32 = 2;
-            num_packet_words32 = 2 + num_payload_words32;
-            vrt_hdr_flags = 0x10000000;
-        break;
-    case 2:
-            header_buff[1] = htonl(0);
-            header_buff[2] = htonl(0);
-            num_header_words32 = 3;
-            num_packet_words32 = 3 + num_payload_words32;
-            vrt_hdr_flags = 0x8000000;
-        break;
-    case 3:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(0);
-            num_header_words32 = 4;
-            num_packet_words32 = 4 + num_payload_words32;
-            vrt_hdr_flags = 0x18000000;
-        break;
-    case 4:
-            header_buff[1] = htonl(metadata.time_spec.secs);
-            num_header_words32 = 2;
-            num_packet_words32 = 2 + num_payload_words32;
-            vrt_hdr_flags = 0xc00000;
-        break;
-    case 5:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(metadata.time_spec.secs);
-            num_header_words32 = 3;
-            num_packet_words32 = 3 + num_payload_words32;
-            vrt_hdr_flags = 0x10c00000;
-        break;
-    case 6:
-            header_buff[1] = htonl(0);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(metadata.time_spec.secs);
-            num_header_words32 = 4;
-            num_packet_words32 = 4 + num_payload_words32;
-            vrt_hdr_flags = 0x8c00000;
-        break;
-    case 7:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(0);
-            header_buff[4] = htonl(metadata.time_spec.secs);
-            num_header_words32 = 5;
-            num_packet_words32 = 5 + num_payload_words32;
-            vrt_hdr_flags = 0x18c00000;
-        break;
-    case 8:
-            header_buff[1] = htonl(0);
-            header_buff[2] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 3;
-            num_packet_words32 = 3 + num_payload_words32;
-            vrt_hdr_flags = 0x100000;
-        break;
-    case 9:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 4;
-            num_packet_words32 = 4 + num_payload_words32;
-            vrt_hdr_flags = 0x10100000;
-        break;
-    case 10:
-            header_buff[1] = htonl(0);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(0);
-            header_buff[4] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 5;
-            num_packet_words32 = 5 + num_payload_words32;
-            vrt_hdr_flags = 0x8100000;
-        break;
-    case 11:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(0);
-            header_buff[4] = htonl(0);
-            header_buff[5] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 6;
-            num_packet_words32 = 6 + num_payload_words32;
-            vrt_hdr_flags = 0x18100000;
-        break;
-    case 12:
-            header_buff[1] = htonl(metadata.time_spec.secs);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 4;
-            num_packet_words32 = 4 + num_payload_words32;
-            vrt_hdr_flags = 0xd00000;
-        break;
-    case 13:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(metadata.time_spec.secs);
-            header_buff[3] = htonl(0);
-            header_buff[4] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 5;
-            num_packet_words32 = 5 + num_payload_words32;
-            vrt_hdr_flags = 0x10d00000;
-        break;
-    case 14:
-            header_buff[1] = htonl(0);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(metadata.time_spec.secs);
-            header_buff[4] = htonl(0);
-            header_buff[5] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 6;
-            num_packet_words32 = 6 + num_payload_words32;
-            vrt_hdr_flags = 0x8d00000;
-        break;
-    case 15:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(0);
-            header_buff[4] = htonl(metadata.time_spec.secs);
-            header_buff[5] = htonl(0);
-            header_buff[6] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 7;
-            num_packet_words32 = 7 + num_payload_words32;
-            vrt_hdr_flags = 0x18d00000;
-        break;
-    case 16:
-            num_header_words32 = 1;
-            num_packet_words32 = 2 + num_payload_words32;
-            vrt_hdr_flags = 0x4000000;
-        break;
-    case 17:
-            header_buff[1] = htonl(metadata.stream_id);
-            num_header_words32 = 2;
-            num_packet_words32 = 3 + num_payload_words32;
-            vrt_hdr_flags = 0x14000000;
-        break;
-    case 18:
-            header_buff[1] = htonl(0);
-            header_buff[2] = htonl(0);
-            num_header_words32 = 3;
-            num_packet_words32 = 4 + num_payload_words32;
-            vrt_hdr_flags = 0xc000000;
-        break;
-    case 19:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(0);
-            num_header_words32 = 4;
-            num_packet_words32 = 5 + num_payload_words32;
-            vrt_hdr_flags = 0x1c000000;
-        break;
-    case 20:
-            header_buff[1] = htonl(metadata.time_spec.secs);
-            num_header_words32 = 2;
-            num_packet_words32 = 3 + num_payload_words32;
-            vrt_hdr_flags = 0x4c00000;
-        break;
-    case 21:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(metadata.time_spec.secs);
-            num_header_words32 = 3;
-            num_packet_words32 = 4 + num_payload_words32;
-            vrt_hdr_flags = 0x14c00000;
-        break;
-    case 22:
-            header_buff[1] = htonl(0);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(metadata.time_spec.secs);
-            num_header_words32 = 4;
-            num_packet_words32 = 5 + num_payload_words32;
-            vrt_hdr_flags = 0xcc00000;
-        break;
-    case 23:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(0);
-            header_buff[4] = htonl(metadata.time_spec.secs);
-            num_header_words32 = 5;
-            num_packet_words32 = 6 + num_payload_words32;
-            vrt_hdr_flags = 0x1cc00000;
-        break;
-    case 24:
-            header_buff[1] = htonl(0);
-            header_buff[2] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 3;
-            num_packet_words32 = 4 + num_payload_words32;
-            vrt_hdr_flags = 0x4100000;
-        break;
-    case 25:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 4;
-            num_packet_words32 = 5 + num_payload_words32;
-            vrt_hdr_flags = 0x14100000;
-        break;
-    case 26:
-            header_buff[1] = htonl(0);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(0);
-            header_buff[4] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 5;
-            num_packet_words32 = 6 + num_payload_words32;
-            vrt_hdr_flags = 0xc100000;
-        break;
-    case 27:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(0);
-            header_buff[4] = htonl(0);
-            header_buff[5] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 6;
-            num_packet_words32 = 7 + num_payload_words32;
-            vrt_hdr_flags = 0x1c100000;
-        break;
-    case 28:
-            header_buff[1] = htonl(metadata.time_spec.secs);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 4;
-            num_packet_words32 = 5 + num_payload_words32;
-            vrt_hdr_flags = 0x4d00000;
-        break;
-    case 29:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(metadata.time_spec.secs);
-            header_buff[3] = htonl(0);
-            header_buff[4] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 5;
-            num_packet_words32 = 6 + num_payload_words32;
-            vrt_hdr_flags = 0x14d00000;
-        break;
-    case 30:
-            header_buff[1] = htonl(0);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(metadata.time_spec.secs);
-            header_buff[4] = htonl(0);
-            header_buff[5] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 6;
-            num_packet_words32 = 7 + num_payload_words32;
-            vrt_hdr_flags = 0xcd00000;
-        break;
-    case 31:
-            header_buff[1] = htonl(metadata.stream_id);
-            header_buff[2] = htonl(0);
-            header_buff[3] = htonl(0);
-            header_buff[4] = htonl(metadata.time_spec.secs);
-            header_buff[5] = htonl(0);
-            header_buff[6] = htonl(metadata.time_spec.get_ticks(tick_rate));
-            num_header_words32 = 7;
-            num_packet_words32 = 8 + num_payload_words32;
-            vrt_hdr_flags = 0x1cd00000;
-        break;
-    }
-
-    //set the burst flags
-    if (metadata.start_of_burst) vrt_hdr_flags |= 0x2000000;
-    if (metadata.end_of_burst)   vrt_hdr_flags |= 0x1000000;
-
-    //fill in complete header word
-    header_buff[0] = htonl(vrt_hdr_flags |
-        ((packet_count & 0xf) << 16) |
-        (num_packet_words32 & 0xffff)
-    );
-}
-
-void vrt::unpack(
-    rx_metadata_t &metadata,            //output
-    const boost::uint32_t *header_buff, //input
-    size_t &num_header_words32,         //output
-    size_t &num_payload_words32,        //output
-    size_t num_packet_words32,          //input
-    size_t &packet_count,               //output
-    double tick_rate                    //input
-){
-    //clear the metadata
-    metadata = rx_metadata_t();
-
-    //extract vrt header
-    boost::uint32_t vrt_hdr_word = ntohl(header_buff[0]);
-    size_t packet_words32 = vrt_hdr_word & 0xffff;
-    packet_count = (vrt_hdr_word >> 16) & 0xf;
-
-    //failure cases
-    if (packet_words32 == 0 or num_packet_words32 < packet_words32)
-        throw std::runtime_error("bad vrt header or packet fragment");
-    if (vrt_hdr_word & (0x7 << 29))
-        throw std::runtime_error("unsupported vrt packet type");
-
-    boost::uint8_t pred = 0;
-    if(vrt_hdr_word & 0x10000000) pred |= 0x1;
-    if(vrt_hdr_word & 0x8000000) pred |= 0x2;
-    if(vrt_hdr_word & 0xc00000) pred |= 0x4;
-    if(vrt_hdr_word & 0x300000) pred |= 0x8;
-    if(vrt_hdr_word & 0x4000000) pred |= 0x10;
-
-    switch(pred){
-    case 0:
-            num_header_words32 = 1;
-            num_payload_words32 = packet_words32 - 1;
-        break;
-    case 1:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            num_header_words32 = 2;
-            num_payload_words32 = packet_words32 - 2;
-        break;
-    case 2:
-            num_header_words32 = 3;
-            num_payload_words32 = packet_words32 - 3;
-        break;
-    case 3:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            num_header_words32 = 4;
-            num_payload_words32 = packet_words32 - 4;
-        break;
-    case 4:
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[1]);
-            num_header_words32 = 2;
-            num_payload_words32 = packet_words32 - 2;
-        break;
-    case 5:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[2]);
-            num_header_words32 = 3;
-            num_payload_words32 = packet_words32 - 3;
-        break;
-    case 6:
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[3]);
-            num_header_words32 = 4;
-            num_payload_words32 = packet_words32 - 4;
-        break;
-    case 7:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[4]);
-            num_header_words32 = 5;
-            num_payload_words32 = packet_words32 - 5;
-        break;
-    case 8:
-            metadata.has_time_spec = true;
-            metadata.time_spec.set_ticks(ntohl(header_buff[2]), tick_rate);
-            num_header_words32 = 3;
-            num_payload_words32 = packet_words32 - 3;
-        break;
-    case 9:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            metadata.has_time_spec = true;
-            metadata.time_spec.set_ticks(ntohl(header_buff[3]), tick_rate);
-            num_header_words32 = 4;
-            num_payload_words32 = packet_words32 - 4;
-        break;
-    case 10:
-            metadata.has_time_spec = true;
-            metadata.time_spec.set_ticks(ntohl(header_buff[4]), tick_rate);
-            num_header_words32 = 5;
-            num_payload_words32 = packet_words32 - 5;
-        break;
-    case 11:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            metadata.has_time_spec = true;
-            metadata.time_spec.set_ticks(ntohl(header_buff[5]), tick_rate);
-            num_header_words32 = 6;
-            num_payload_words32 = packet_words32 - 6;
-        break;
-    case 12:
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[1]);
-            metadata.time_spec.set_ticks(ntohl(header_buff[3]), tick_rate);
-            num_header_words32 = 4;
-            num_payload_words32 = packet_words32 - 4;
-        break;
-    case 13:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[2]);
-            metadata.time_spec.set_ticks(ntohl(header_buff[4]), tick_rate);
-            num_header_words32 = 5;
-            num_payload_words32 = packet_words32 - 5;
-        break;
-    case 14:
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[3]);
-            metadata.time_spec.set_ticks(ntohl(header_buff[5]), tick_rate);
-            num_header_words32 = 6;
-            num_payload_words32 = packet_words32 - 6;
-        break;
-    case 15:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[4]);
-            metadata.time_spec.set_ticks(ntohl(header_buff[6]), tick_rate);
-            num_header_words32 = 7;
-            num_payload_words32 = packet_words32 - 7;
-        break;
-    case 16:
-            num_header_words32 = 1;
-            num_payload_words32 = packet_words32 - 2;
-        break;
-    case 17:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            num_header_words32 = 2;
-            num_payload_words32 = packet_words32 - 3;
-        break;
-    case 18:
-            num_header_words32 = 3;
-            num_payload_words32 = packet_words32 - 4;
-        break;
-    case 19:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            num_header_words32 = 4;
-            num_payload_words32 = packet_words32 - 5;
-        break;
-    case 20:
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[1]);
-            num_header_words32 = 2;
-            num_payload_words32 = packet_words32 - 3;
-        break;
-    case 21:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[2]);
-            num_header_words32 = 3;
-            num_payload_words32 = packet_words32 - 4;
-        break;
-    case 22:
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[3]);
-            num_header_words32 = 4;
-            num_payload_words32 = packet_words32 - 5;
-        break;
-    case 23:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[4]);
-            num_header_words32 = 5;
-            num_payload_words32 = packet_words32 - 6;
-        break;
-    case 24:
-            metadata.has_time_spec = true;
-            metadata.time_spec.set_ticks(ntohl(header_buff[2]), tick_rate);
-            num_header_words32 = 3;
-            num_payload_words32 = packet_words32 - 4;
-        break;
-    case 25:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            metadata.has_time_spec = true;
-            metadata.time_spec.set_ticks(ntohl(header_buff[3]), tick_rate);
-            num_header_words32 = 4;
-            num_payload_words32 = packet_words32 - 5;
-        break;
-    case 26:
-            metadata.has_time_spec = true;
-            metadata.time_spec.set_ticks(ntohl(header_buff[4]), tick_rate);
-            num_header_words32 = 5;
-            num_payload_words32 = packet_words32 - 6;
-        break;
-    case 27:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            metadata.has_time_spec = true;
-            metadata.time_spec.set_ticks(ntohl(header_buff[5]), tick_rate);
-            num_header_words32 = 6;
-            num_payload_words32 = packet_words32 - 7;
-        break;
-    case 28:
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[1]);
-            metadata.time_spec.set_ticks(ntohl(header_buff[3]), tick_rate);
-            num_header_words32 = 4;
-            num_payload_words32 = packet_words32 - 5;
-        break;
-    case 29:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[2]);
-            metadata.time_spec.set_ticks(ntohl(header_buff[4]), tick_rate);
-            num_header_words32 = 5;
-            num_payload_words32 = packet_words32 - 6;
-        break;
-    case 30:
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[3]);
-            metadata.time_spec.set_ticks(ntohl(header_buff[5]), tick_rate);
-            num_header_words32 = 6;
-            num_payload_words32 = packet_words32 - 7;
-        break;
-    case 31:
-            metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[1]);
-            metadata.has_time_spec = true;
-            metadata.time_spec.secs = ntohl(header_buff[4]);
-            metadata.time_spec.set_ticks(ntohl(header_buff[6]), tick_rate);
-            num_header_words32 = 7;
-            num_payload_words32 = packet_words32 - 8;
-        break;
-    }
-}
-