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54 lines
1.3 KiB
Text
54 lines
1.3 KiB
Text
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Canonical caps/structure strings (those created by gst_caps_to_string()
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and gst_structure_to_string()) do not have AUTO_VALUE.
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Goals:
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- UTF-8 clean
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- SIMPLE_STRINGs should cover most simple cases that don't interfere
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with other parts of the gst_caps or gst_parse grammar
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- forward-parsed grammar
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- quoted strings handle backslash escaping as well as XML-style (&ack;)
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escaping
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CAPS = STRUCTURE [ ';' STRUCTURE ]*
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STRUCTURE = STRUCTURE_NAME [ ',' FIELD ]*
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STRUCTURE_NAME = STRING
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FIELD = FIELD_NAME '=' TYPED_VALUE
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FIELD_NAME = SIMPLE_STRING
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TYPED_VALUE = CANONICAL_VALUE | AUTO_VALUE
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CANONICAL_VALUE = '{' TYPED_VALUE [ ',' TYPED_VALUE ]* '}'
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| '[' TYPED_VALUE ',' TYPED_VALUE ']'
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| '(' TYPE ')' VALUE
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AUTO_VALUE = [-+]?[0-9][0-9]*
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| [-+]?[0-9][0-9]*[.][0-9]*[eE][-+][0-9]*
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| STRING
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VALUE = STRING
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STRING = ["][^"]["]
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| ['][^'][']
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| SIMPLE_STRING
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SIMPLE_STRING = [A-Za-z0-9_+-:./]+
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TYPE = "int" | "i" | "float" | "f" | "double" | "d" | "fourcc" | "4"
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| "boolean" | "bool" | "b"
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| GTYPE
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Canonical Examples:
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"audio/raw"
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"audio/raw", rate=(int)44100
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"audio/raw", rate=(int)44100, signed=(boolean)true
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"audio/raw", rate={ (int)44100, (int)48000 }
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"audio/raw", rate=[ (int)8000, (int)48000 ]
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