@prefix : . @prefix swh: . @prefix foaf: . @prefix doap: . @prefix swhext: . @prefix pg: . @prefix epp: . swh:surroundEncoder-in a pg:Group ; a pg:FourPointZeroGroup ; :symbol "in" . swh:surroundEncoder-out a pg:Group ; a pg:StereoGroup ; :symbol "out" ; pg:source swh:surroundEncoder-in . swh:surroundEncoder a :Plugin ; a :ConverterPlugin ; doap:name "Surround matrix encoder" ; doap:maintainer [ foaf:name "Steve Harris"; foaf:homepage ; foaf:mbox ; ] ; doap:license ; :documentation ; :pluginProperty :hardRtCapable ; :port [ a :InputPort, :AudioPort ; :name "L" ; :index 0 ; :symbol "l" ; pg:inGroup swh:surroundEncoder-in ; pg:role pg:leftChannel ; ] ; :port [ a :InputPort, :AudioPort ; :name "R" ; :index 1 ; :symbol "r" ; pg:inGroup swh:surroundEncoder-in ; pg:role pg:rightChannel ; ] ; :port [ a :InputPort, :AudioPort ; :name "C" ; :index 2 ; :symbol "c" ; pg:inGroup swh:surroundEncoder-in ; pg:role pg:centerChannel ; ] ; :port [ a :InputPort, :AudioPort ; :name "S" ; :index 3 ; :symbol "s" ; pg:inGroup swh:surroundEncoder-in ; pg:role pg:rearCenterChannel ; ] ; :port [ a :OutputPort, :AudioPort ; :name "Lt" ; :index 4 ; :symbol "lt" ; pg:inGroup swh:surroundEncoder-out ; pg:role pg:leftChannel ; ] ; :port [ a :OutputPort, :AudioPort ; :name "Rt" ; :index 5 ; :symbol "rt" ; pg:inGroup swh:surroundEncoder-out ; pg:role pg:rightChannel ; ] ; swhext:code """ #include "ladspa-util.h" #define D_SIZE 256 #define NZEROS 200 /* The non-zero taps of the Hilbert transformer */ static float xcoeffs[] = { +0.0008103736f, +0.0008457886f, +0.0009017196f, +0.0009793364f, +0.0010798341f, +0.0012044365f, +0.0013544008f, +0.0015310235f, +0.0017356466f, +0.0019696659f, +0.0022345404f, +0.0025318040f, +0.0028630784f, +0.0032300896f, +0.0036346867f, +0.0040788644f, +0.0045647903f, +0.0050948365f, +0.0056716186f, +0.0062980419f, +0.0069773575f, +0.0077132300f, +0.0085098208f, +0.0093718901f, +0.0103049226f, +0.0113152847f, +0.0124104218f, +0.0135991079f, +0.0148917649f, +0.0163008758f, +0.0178415242f, +0.0195321089f, +0.0213953037f, +0.0234593652f, +0.0257599469f, +0.0283426636f, +0.0312667947f, +0.0346107648f, +0.0384804823f, +0.0430224431f, +0.0484451086f, +0.0550553725f, +0.0633242001f, +0.0740128560f, +0.0884368322f, +0.1090816773f, +0.1412745301f, +0.1988673273f, +0.3326528346f, +0.9997730178f, -0.9997730178f, -0.3326528346f, -0.1988673273f, -0.1412745301f, -0.1090816773f, -0.0884368322f, -0.0740128560f, -0.0633242001f, -0.0550553725f, -0.0484451086f, -0.0430224431f, -0.0384804823f, -0.0346107648f, -0.0312667947f, -0.0283426636f, -0.0257599469f, -0.0234593652f, -0.0213953037f, -0.0195321089f, -0.0178415242f, -0.0163008758f, -0.0148917649f, -0.0135991079f, -0.0124104218f, -0.0113152847f, -0.0103049226f, -0.0093718901f, -0.0085098208f, -0.0077132300f, -0.0069773575f, -0.0062980419f, -0.0056716186f, -0.0050948365f, -0.0045647903f, -0.0040788644f, -0.0036346867f, -0.0032300896f, -0.0028630784f, -0.0025318040f, -0.0022345404f, -0.0019696659f, -0.0017356466f, -0.0015310235f, -0.0013544008f, -0.0012044365f, -0.0010798341f, -0.0009793364f, -0.0009017196f, -0.0008457886f, -0.0008103736f, }; """ ; swhext:callback [ swhext:event "instantiate" ; swhext:code """ buffer_size = (int)(0.0072f * s_rate); buffer_pos = 0; buffer = calloc(buffer_size, sizeof(LADSPA_Data)); delay = calloc(D_SIZE, sizeof(LADSPA_Data)); dptr = 0; """ ; ] ; swhext:callback [ swhext:event "activate" ; swhext:code """ memset(buffer, 0, buffer_size * sizeof(LADSPA_Data)); """ ; ] ; swhext:callback [ swhext:event "cleanup" ; swhext:code """ free(plugin_data->buffer); free(plugin_data->delay); """ ; ] ; swhext:callback [ swhext:event "run" ; swhext:code """ unsigned long pos; LADSPA_Data s_delayed; unsigned int i; float hilb; for (pos = 0; pos < sample_count; pos++) { delay[dptr] = s[pos]; hilb = 0.0f; for (i = 0; i <= NZEROS/2; i++) { hilb += (xcoeffs[i] * delay[(dptr - i*2) & (D_SIZE - 1)]); } dptr = (dptr + 1) & (D_SIZE - 1); s_delayed = buffer[buffer_pos]; buffer[buffer_pos++] = hilb; buffer_pos %= buffer_size; buffer_write(lt[pos], l[pos] + c[pos] * 0.707946f - s_delayed * 0.707946f); buffer_write(rt[pos], r[pos] + c[pos] * 0.707946f + s_delayed * 0.707946f); } plugin_data->dptr = dptr; plugin_data->buffer_pos = buffer_pos; """ ; ] ; swhext:createdBy .