Mixed Data Set support

CHANGELOG.md

@@ -1,3 +1,9 @@
+# v1.12.0
+
+* add _Mixed Data Set_ support: `mixed_data_set_header_packet` / `mixed_data_set_payload_packet` incl. views and factory functions
+* add `mixed_data_set` with `send_mixed_data_set` / `as_mixed_data_set_packets`
+* add `mixed_data_set_collector` reassembling _Mixed Data Sets_ from incoming packets (16 simultaneous `mds_id`s)
+
 # v1.11.0
 
 * add data_byte accessors to `flex_data_message_view`

CMakeLists.txt

@@ -49,6 +49,8 @@ set(LibSources
     inc/midi/data_message.h
     inc/midi/extended_data_message.h
     inc/midi/flex_data_message.h
+    inc/midi/mixed_data_set.h
+    inc/midi/mixed_data_set_collector.h src/mixed_data_set_collector.cpp
     inc/midi/stream_message.h
     inc/midi/sysex.h src/sysex.cpp
     inc/midi/sysex_collector.h src/sysex_collector.cpp
@@ -91,6 +93,9 @@ if( NIMIDI2_TESTS )
         tests/data_message_tests.cpp
         tests/extended_data_message_tests.cpp
         tests/flex_data_message_tests.cpp
+        tests/mixed_data_set_tests.cpp
+        tests/mixed_data_set_test_data.cpp tests/mixed_data_set_test_data.h
+        tests/mixed_data_set_collector_tests.cpp
         tests/stream_message_tests.cpp
         tests/system_message_tests.cpp
         tests/utility_message_tests.cpp
@@ -136,6 +141,7 @@ if( NIMIDI2_EXAMPLES )
         docs/data_message.examples.cpp
         docs/extended_data_message.examples.cpp
         docs/flex_data_message.examples.cpp
+        docs/mixed_data_set.examples.cpp
         docs/midi1_byte_stream.examples.cpp
         docs/midi1_channel_voice_message.examples.cpp
         docs/midi2_channel_voice_message.examples.cpp

docs/docs.cpp

@@ -2,6 +2,7 @@ extern void run_channel_voice_message_examples();
 extern void run_data_message_examples();
 extern void run_extended_data_message_examples();
 extern void run_flex_data_message_examples();
+extern void run_mixed_data_set_examples();
 extern void run_midi1_byte_stream_examples();
 extern void run_midi1_channel_voice_message_examples();
 extern void run_midi2_channel_voice_message_examples();
@@ -29,6 +30,7 @@ int main()
 
     run_stream_message_examples();
     run_flex_data_message_examples();
+    run_mixed_data_set_examples();
 
     return 0;
 }

docs/mixed_data_set.examples.cpp

@@ -0,0 +1,51 @@
+#include <midi/manufacturer.h>
+#include <midi/mixed_data_set.h>
+#include <midi/mixed_data_set_collector.h>
+
+#include <cassert>
+
+void mixed_data_set_examples()
+{
+    using namespace midi;
+
+    // a mixed data set with some payload data
+    mixed_data_set mds{ manufacturer::native_instruments, 0, 0, 0 };
+    mds.data = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10 };
+
+    for (const auto& p : as_mixed_data_set_packets(mds, 0x0))
+    {
+        // send packet
+        // ...
+        (void)p;
+    }
+
+    // or send packets without allocating a vector
+    send_mixed_data_set(mds, 0x0, 0, [](const universal_packet& p) {
+        // send packet
+        // ...
+        (void)p;
+    });
+}
+
+void mixed_data_set_collector_examples()
+{
+    using namespace midi;
+
+    universal_packet p;
+
+    mixed_data_set_collector c{ [](const mixed_data_set& mds, uint4_t mds_id) {
+        // do something with message
+        // ...
+        (void)mds;
+        (void)mds_id;
+    } };
+
+    if (is_mixed_data_set_packet(p))
+        c.feed(p);
+}
+
+void run_mixed_data_set_examples()
+{
+    mixed_data_set_examples();
+    mixed_data_set_collector_examples();
+}

docs/mixed_data_set.md

@@ -0,0 +1,100 @@
+# Mixed Data Set
+
+Code examples can be found in [`mixed_data_set.examples.cpp`](mixed_data_set.examples.cpp).
+
+_Mixed Data Set_ messages allow transfer of arbitrary (8 bit) data, the data being
+split into _chunks_, each chunk consisting of a _header_ packet followed by _payload_
+packets (14 data bytes per packet). Up to 16 _Mixed Data Sets_ (distinguished by
+their `mds_id`) can be transmitted simultaneously within a group.
+
+A complete _Mixed Data Set_ is represented by
+
+```cpp
+struct mixed_data_set
+{
+    using data_type = std::vector<uint8_t>;
+
+    manufacturer_t manufacturerID;
+    uint16_t       deviceID;       // 0xFFFF means 'all call'
+    uint16_t       subID1;
+    uint16_t       subID2;
+    data_type      data;
+
+    mixed_data_set(manufacturer_t);
+    mixed_data_set(manufacturer_t, uint16_t device_id, uint16_t sub_id_1, uint16_t sub_id_2);
+    mixed_data_set(manufacturer_t, uint16_t device_id, uint16_t sub_id_1, uint16_t sub_id_2, data_type);
+
+    void clear();
+};
+```
+
+Like in _System Exclusive_ messages, `deviceID`, `subID1` and `subID2` are defined by
+other MMA/AMEI specifications when `manufacturerID` is a Universal SysEx ID, otherwise
+their use is defined by the manufacturer.
+
+On the wire the manufacturer ID is encoded in 16 bits, conversions are available as
+
+```cpp
+constexpr uint16_t       mixed_data_set_manufacturer_id(manufacturer_t);
+constexpr manufacturer_t manufacturer_from_mixed_data_set_id(uint16_t);
+```
+
+## Message Creation and Filtering
+
+Individual packets are represented by `mixed_data_set_header_packet` and
+`mixed_data_set_payload_packet` (in `extended_data_message.h`), with corresponding
+factory functions, filters and views:
+
+```cpp
+mixed_data_set_header_packet  make_mixed_data_set_header_packet(uint4_t mds_id, group_t = 0);
+mixed_data_set_payload_packet make_mixed_data_set_payload_packet(uint4_t mds_id, group_t = 0);
+
+bool is_mixed_data_set_header_packet(const universal_packet&);
+bool is_mixed_data_set_payload_packet(const universal_packet&);
+bool is_mixed_data_set_packet(const universal_packet&);
+
+std::optional<mixed_data_set_header_packet_view>  as_mixed_data_set_header_packet_view(const universal_packet&);
+std::optional<mixed_data_set_payload_packet_view> as_mixed_data_set_payload_packet_view(const universal_packet&);
+```
+
+## Sending Mixed Data Sets
+
+Usually one does not create _Mixed Data Set_ packets manually, but uses
+
+```cpp
+template<typename Sender>
+void send_mixed_data_set(const mixed_data_set&, uint4_t mds_id, group_t, Sender&&);
+
+std::vector<extended_data_message> as_mixed_data_set_packets(const mixed_data_set&, uint4_t mds_id, group_t = 0);
+```
+
+`send_mixed_data_set` splits the data into chunks and packets and forwards them to
+`sender(p)`. `as_mixed_data_set_packets` returns the resulting packets in a vector
+instead.
+
+## Collecting Mixed Data Sets
+
+Use `mixed_data_set_collector` to reassemble _Mixed Data Sets_ from incoming packets:
+
+```cpp
+class mixed_data_set_collector
+{
+public:
+    using callback = std::function<void(const mixed_data_set&, uint4_t mds_id)>;
+
+    explicit mixed_data_set_collector(callback);
+
+    void set_callback(callback);
+    void set_max_data_size(size_t); // limit maximum size of accepted mixed data set data
+
+    void feed(const universal_packet&);
+    void reset();
+};
+```
+
+Feed incoming packets into `feed()`. Once the final chunk of a _Mixed Data Set_ is
+complete the callback is invoked with the reassembled `mixed_data_set` and its
+`mds_id`. The collector maintains an independent collection state per `mds_id`, so
+interleaved _Mixed Data Sets_ are supported. Aborted messages (a header with
+_Number of this Chunk_ set to zero), out-of-order chunks and invalid headers discard
+the collection state of the affected `mds_id`.