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avcodec/ccaption_dec: Avoid relocations for strings
The longest string here takes four bytes, so using an array of pointers is wasteful even when ignoring the cost of relocations; the lack of relocations also implies that this array will now be put into .rodata and not into .data.rel.ro. Static asserts are used to ensure that all strings are always properly zero-terminated. Tested-by: Marth64 <marth64@proxyid.net> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
parent
c9f5cea9cc
commit
ec1b6e0cd4
@ -67,108 +67,123 @@ enum cc_charset {
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CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH,
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};
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static const char *charset_overrides[4][128] =
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#define CHARSET_OVERRIDE_LIST(START_SET, ENTRY, END_SET) \
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START_SET(CCSET_BASIC_AMERICAN) \
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ENTRY(0x27, "\u2019") \
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ENTRY(0x2a, "\u00e1") \
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ENTRY(0x5c, "\u00e9") \
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ENTRY(0x5e, "\u00ed") \
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ENTRY(0x5f, "\u00f3") \
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ENTRY(0x60, "\u00fa") \
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ENTRY(0x7b, "\u00e7") \
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ENTRY(0x7c, "\u00f7") \
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ENTRY(0x7d, "\u00d1") \
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ENTRY(0x7e, "\u00f1") \
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ENTRY(0x7f, "\u2588") \
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END_SET \
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START_SET(CCSET_SPECIAL_AMERICAN) \
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ENTRY(0x30, "\u00ae") \
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ENTRY(0x31, "\u00b0") \
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ENTRY(0x32, "\u00bd") \
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ENTRY(0x33, "\u00bf") \
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ENTRY(0x34, "\u2122") \
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ENTRY(0x35, "\u00a2") \
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ENTRY(0x36, "\u00a3") \
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ENTRY(0x37, "\u266a") \
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ENTRY(0x38, "\u00e0") \
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ENTRY(0x39, "\u00A0") \
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ENTRY(0x3a, "\u00e8") \
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ENTRY(0x3b, "\u00e2") \
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ENTRY(0x3c, "\u00ea") \
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ENTRY(0x3d, "\u00ee") \
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ENTRY(0x3e, "\u00f4") \
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ENTRY(0x3f, "\u00fb") \
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END_SET \
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START_SET(CCSET_EXTENDED_SPANISH_FRENCH_MISC) \
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ENTRY(0x20, "\u00c1") \
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ENTRY(0x21, "\u00c9") \
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ENTRY(0x22, "\u00d3") \
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ENTRY(0x23, "\u00da") \
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ENTRY(0x24, "\u00dc") \
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ENTRY(0x25, "\u00fc") \
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ENTRY(0x26, "\u00b4") \
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ENTRY(0x27, "\u00a1") \
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ENTRY(0x28, "*") \
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ENTRY(0x29, "\u2018") \
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ENTRY(0x2a, "-") \
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ENTRY(0x2b, "\u00a9") \
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ENTRY(0x2c, "\u2120") \
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ENTRY(0x2d, "\u00b7") \
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ENTRY(0x2e, "\u201c") \
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ENTRY(0x2f, "\u201d") \
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ENTRY(0x30, "\u00c0") \
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ENTRY(0x31, "\u00c2") \
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ENTRY(0x32, "\u00c7") \
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ENTRY(0x33, "\u00c8") \
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ENTRY(0x34, "\u00ca") \
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ENTRY(0x35, "\u00cb") \
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ENTRY(0x36, "\u00eb") \
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ENTRY(0x37, "\u00ce") \
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ENTRY(0x38, "\u00cf") \
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ENTRY(0x39, "\u00ef") \
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ENTRY(0x3a, "\u00d4") \
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ENTRY(0x3b, "\u00d9") \
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ENTRY(0x3c, "\u00f9") \
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ENTRY(0x3d, "\u00db") \
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ENTRY(0x3e, "\u00ab") \
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ENTRY(0x3f, "\u00bb") \
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END_SET \
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START_SET(CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH) \
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ENTRY(0x20, "\u00c3") \
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ENTRY(0x21, "\u00e3") \
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ENTRY(0x22, "\u00cd") \
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ENTRY(0x23, "\u00cc") \
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ENTRY(0x24, "\u00ec") \
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ENTRY(0x25, "\u00d2") \
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ENTRY(0x26, "\u00f2") \
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ENTRY(0x27, "\u00d5") \
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ENTRY(0x28, "\u00f5") \
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ENTRY(0x29, "{") \
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ENTRY(0x2a, "}") \
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ENTRY(0x2b, "\\") \
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ENTRY(0x2c, "^") \
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ENTRY(0x2d, "_") \
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ENTRY(0x2e, "|") \
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ENTRY(0x2f, "~") \
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ENTRY(0x30, "\u00c4") \
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ENTRY(0x31, "\u00e4") \
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ENTRY(0x32, "\u00d6") \
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ENTRY(0x33, "\u00f6") \
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ENTRY(0x34, "\u00df") \
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ENTRY(0x35, "\u00a5") \
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ENTRY(0x36, "\u00a4") \
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ENTRY(0x37, "\u00a6") \
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ENTRY(0x38, "\u00c5") \
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ENTRY(0x39, "\u00e5") \
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ENTRY(0x3a, "\u00d8") \
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ENTRY(0x3b, "\u00f8") \
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ENTRY(0x3c, "\u250c") \
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ENTRY(0x3d, "\u2510") \
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ENTRY(0x3e, "\u2514") \
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ENTRY(0x3f, "\u2518") \
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END_SET \
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static const char charset_overrides[4][128][sizeof("\u266a")] =
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{
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[CCSET_BASIC_AMERICAN] = {
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[0x27] = "\u2019",
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[0x2a] = "\u00e1",
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[0x5c] = "\u00e9",
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[0x5e] = "\u00ed",
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[0x5f] = "\u00f3",
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[0x60] = "\u00fa",
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[0x7b] = "\u00e7",
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[0x7c] = "\u00f7",
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[0x7d] = "\u00d1",
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[0x7e] = "\u00f1",
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[0x7f] = "\u2588"
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},
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[CCSET_SPECIAL_AMERICAN] = {
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[0x30] = "\u00ae",
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[0x31] = "\u00b0",
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[0x32] = "\u00bd",
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[0x33] = "\u00bf",
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[0x34] = "\u2122",
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[0x35] = "\u00a2",
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[0x36] = "\u00a3",
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[0x37] = "\u266a",
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[0x38] = "\u00e0",
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[0x39] = "\u00A0",
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[0x3a] = "\u00e8",
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[0x3b] = "\u00e2",
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[0x3c] = "\u00ea",
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[0x3d] = "\u00ee",
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[0x3e] = "\u00f4",
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[0x3f] = "\u00fb",
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},
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[CCSET_EXTENDED_SPANISH_FRENCH_MISC] = {
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[0x20] = "\u00c1",
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[0x21] = "\u00c9",
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[0x22] = "\u00d3",
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[0x23] = "\u00da",
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[0x24] = "\u00dc",
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[0x25] = "\u00fc",
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[0x26] = "\u00b4",
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[0x27] = "\u00a1",
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[0x28] = "*",
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[0x29] = "\u2018",
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[0x2a] = "-",
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[0x2b] = "\u00a9",
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[0x2c] = "\u2120",
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[0x2d] = "\u00b7",
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[0x2e] = "\u201c",
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[0x2f] = "\u201d",
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[0x30] = "\u00c0",
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[0x31] = "\u00c2",
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[0x32] = "\u00c7",
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[0x33] = "\u00c8",
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[0x34] = "\u00ca",
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[0x35] = "\u00cb",
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[0x36] = "\u00eb",
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[0x37] = "\u00ce",
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[0x38] = "\u00cf",
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[0x39] = "\u00ef",
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[0x3a] = "\u00d4",
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[0x3b] = "\u00d9",
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[0x3c] = "\u00f9",
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[0x3d] = "\u00db",
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[0x3e] = "\u00ab",
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[0x3f] = "\u00bb",
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},
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[CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH] = {
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[0x20] = "\u00c3",
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[0x21] = "\u00e3",
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[0x22] = "\u00cd",
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[0x23] = "\u00cc",
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[0x24] = "\u00ec",
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[0x25] = "\u00d2",
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[0x26] = "\u00f2",
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[0x27] = "\u00d5",
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[0x28] = "\u00f5",
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[0x29] = "{",
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[0x2a] = "}",
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[0x2b] = "\\",
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[0x2c] = "^",
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[0x2d] = "_",
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[0x2e] = "|",
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[0x2f] = "~",
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[0x30] = "\u00c4",
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[0x31] = "\u00e4",
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[0x32] = "\u00d6",
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[0x33] = "\u00f6",
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[0x34] = "\u00df",
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[0x35] = "\u00a5",
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[0x36] = "\u00a4",
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[0x37] = "\u00a6",
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[0x38] = "\u00c5",
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[0x39] = "\u00e5",
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[0x3a] = "\u00d8",
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[0x3b] = "\u00f8",
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[0x3c] = "\u250c",
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[0x3d] = "\u2510",
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[0x3e] = "\u2514",
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[0x3f] = "\u2518",
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#define START_SET(IDX) \
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[IDX] = {
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#define ENTRY(idx, string) \
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[idx] = string,
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#define END_SET \
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},
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CHARSET_OVERRIDE_LIST(START_SET, ENTRY, END_SET)
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};
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#define EMPTY_START(IDX)
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#define EMPTY_END
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#define ASSERT_ENTRY(IDX, str) \
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_Static_assert(sizeof(str) <= sizeof(charset_overrides[0][0]), \
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"'" str "' string takes too much space");
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CHARSET_OVERRIDE_LIST(EMPTY_START, ASSERT_ENTRY, EMPTY_END)
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static const unsigned char bg_attribs[8] = // Color
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{
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@ -571,7 +586,7 @@ static int capture_screen(CCaptionSubContext *ctx)
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prev_color = color[j];
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prev_bg_color = bg[j];
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override = charset_overrides[(int)charset[j]][(int)row[j]];
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if (override) {
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if (override[0]) {
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av_bprintf(&ctx->buffer[bidx], "%s%s%s%s%s", e_tag, s_tag, c_tag, b_tag, override);
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seen_char = 1;
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} else if (row[j] == ' ' && !seen_char) {
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