extend channel-map
add tests for identity matrix, monotonic, subset, which are handy to verify if inplace processing is possible. add `unset()` for upcoming GUI work.
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@ -42,14 +42,14 @@ public:
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ChanMapping(ARDOUR::ChanCount identity);
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ChanMapping(const ChanMapping&);
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uint32_t get(DataType t, uint32_t from, bool* valid);
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uint32_t get(DataType t, uint32_t from, bool* valid) const;
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/** get buffer mapping for given data type and pin
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* @param type data type
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* @param from pin
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* @returns mapped buffer number (or ChanMapping::Invalid)
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*/
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uint32_t get(DataType t, uint32_t from) { return get (t, from, NULL); }
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uint32_t get(DataType t, uint32_t from) const { return get (t, from, NULL); }
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/** set buffer mapping for given data type
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* @param type data type
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* @param from pin
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@ -59,6 +59,30 @@ public:
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void offset_from(DataType t, int32_t delta);
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void offset_to(DataType t, int32_t delta);
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/** remove mapping
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* @param type data type
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* @param from source to remove from mapping
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*/
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void unset(DataType t, uint32_t from);
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/** Test mapping matrix for identity
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* @param offset per data-type offset to take into account
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* @returns true if the mapping is a channel identity map
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*/
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bool is_identity (ARDOUR::ChanCount offset = ARDOUR::ChanCount()) const;
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/** Test if this mapping is monotonic (useful to see if inplace processing is feasible)
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* @returns true if the map is a strict monotonic set
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*/
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bool is_monotonic () const;
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/** Test if this mapping is a subset
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* @param superset to test against
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* @returns true if all mapping are also present in the superset
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*/
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bool is_subset (const ChanMapping& superset) const;
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typedef std::map<uint32_t, uint32_t> TypeMapping;
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typedef std::map<DataType, TypeMapping> Mappings;
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@ -46,14 +46,14 @@ ChanMapping::ChanMapping (const ChanMapping& other )
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}
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uint32_t
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ChanMapping::get(DataType t, uint32_t from, bool* valid)
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ChanMapping::get(DataType t, uint32_t from, bool* valid) const
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{
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Mappings::iterator tm = _mappings.find(t);
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Mappings::const_iterator tm = _mappings.find(t);
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if (tm == _mappings.end()) {
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if (valid) { *valid = false; }
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return -1;
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}
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TypeMapping::iterator m = tm->second.find(from);
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TypeMapping::const_iterator m = tm->second.find(from);
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if (m == tm->second.end()) {
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if (valid) { *valid = false; }
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return -1;
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@ -73,6 +73,17 @@ ChanMapping::set(DataType t, uint32_t from, uint32_t to)
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tm->second.insert(std::make_pair(from, to));
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}
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void
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ChanMapping::unset(DataType t, uint32_t from)
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{
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assert(t != DataType::NIL);
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Mappings::iterator tm = _mappings.find(t);
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if (tm == _mappings.end()) {
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return;
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}
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tm->second.erase(from);
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}
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/** Offset the 'from' field of every mapping for type @a t by @a delta */
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void
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ChanMapping::offset_from(DataType t, int32_t delta)
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@ -99,6 +110,52 @@ ChanMapping::offset_to(DataType t, int32_t delta)
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}
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}
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bool
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ChanMapping::is_subset (const ChanMapping& superset) const
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{
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for (ARDOUR::ChanMapping::Mappings::const_iterator tm = mappings().begin(); tm != mappings().end(); ++tm) {
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for (ARDOUR::ChanMapping::TypeMapping::const_iterator i = tm->second.begin(); i != tm->second.end(); ++i) {
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bool valid;
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if (i->second != superset.get (tm->first, i->first, &valid)) {
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return false;
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}
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if (!valid) {
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return false;
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}
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}
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}
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return true;
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}
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bool
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ChanMapping::is_monotonic () const
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{
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for (ARDOUR::ChanMapping::Mappings::const_iterator tm = mappings().begin(); tm != mappings().end(); ++tm) {
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uint32_t prev = UINT32_MAX;
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for (ARDOUR::ChanMapping::TypeMapping::const_iterator i = tm->second.begin(); i != tm->second.end(); ++i) {
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// set keys are strictly weak ordered
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if (i->first < i->second || i->second == prev) {
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return false;
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}
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prev = i->second;
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}
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}
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return true;
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}
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bool
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ChanMapping::is_identity (ChanCount offset) const
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{
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for (ARDOUR::ChanMapping::Mappings::const_iterator tm = mappings().begin(); tm != mappings().end(); ++tm) {
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for (ARDOUR::ChanMapping::TypeMapping::const_iterator i = tm->second.begin(); i != tm->second.end(); ++i) {
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if (i->first + offset.get (tm->first) != i->second) {
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return false;
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}
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}
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}
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return true;
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}
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} // namespace ARDOUR
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std::ostream& operator<<(std::ostream& o, const ARDOUR::ChanMapping& cm)
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@ -181,7 +181,7 @@ LuaBindings::common (lua_State* L)
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.beginClass <ChanMapping> ("ChanMapping")
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.addVoidConstructor ()
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.addFunction ("get", static_cast<uint32_t(ChanMapping::*)(DataType, uint32_t)>(&ChanMapping::get))
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.addFunction ("get", static_cast<uint32_t(ChanMapping::*)(DataType, uint32_t) const>(&ChanMapping::get))
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.addFunction ("set", &ChanMapping::set)
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.addConst ("Invalid", 4294967295) // UINT32_MAX
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.endClass ()
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