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lavc/ccaption_dec: implement special and extended character sets

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character sets implemented as defined in https://en.wikipedia.org/wiki/EIA-608#Characters
pull/178/head
Aman Gupta 9 years ago committed by Clément Bœsch
parent 2f26b67d55
commit 5f5467e749
1 changed files with 149 additions and 3 deletions
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  1. 152
      libavcodec/ccaption_dec.c

152
libavcodec/ccaption_dec.c
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@ -63,6 +63,116 @@ enum cc_font {
CCFONT_UNDERLINED_ITALICS,
};
enum cc_charset {
CCSET_BASIC_AMERICAN,
CCSET_SPECIAL_AMERICAN,
CCSET_EXTENDED_SPANISH_FRENCH_MISC,
CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH,
};
static const char *charset_overrides[4][128] =
{
[CCSET_BASIC_AMERICAN] = {
[0x27] = "\u2019",
[0x2a] = "\u00e1",
[0x5c] = "\u00e9",
[0x5e] = "\u00ed",
[0x5f] = "\u00f3",
[0x60] = "\u00fa",
[0x7b] = "\u00e7",
[0x7c] = "\u00f7",
[0x7d] = "\u00d1",
[0x7e] = "\u00f1",
[0x7f] = "\u2588"
},
[CCSET_SPECIAL_AMERICAN] = {
[0x30] = "\u00ae",
[0x31] = "\u00b0",
[0x32] = "\u00bd",
[0x33] = "\u00bf",
[0x34] = "\u2122",
[0x35] = "\u00a2",
[0x36] = "\u00a3",
[0x37] = "\u266a",
[0x38] = "\u00e0",
[0x39] = "\u00A0",
[0x3a] = "\u00e8",
[0x3b] = "\u00e2",
[0x3c] = "\u00ea",
[0x3d] = "\u00ee",
[0x3e] = "\u00f4",
[0x3f] = "\u00fb",
},
[CCSET_EXTENDED_SPANISH_FRENCH_MISC] = {
[0x20] = "\u00c1",
[0x21] = "\u00c9",
[0x22] = "\u00d3",
[0x23] = "\u00da",
[0x24] = "\u00dc",
[0x25] = "\u00fc",
[0x26] = "\u00b4",
[0x27] = "\u00a1",
[0x28] = "*",
[0x29] = "\u2018",
[0x2a] = "-",
[0x2b] = "\u00a9",
[0x2c] = "\u2120",
[0x2d] = "\u00b7",
[0x2e] = "\u201c",
[0x2f] = "\u201d",
[0x30] = "\u00c0",
[0x31] = "\u00c2",
[0x32] = "\u00c7",
[0x33] = "\u00c8",
[0x34] = "\u00ca",
[0x35] = "\u00cb",
[0x36] = "\u00eb",
[0x37] = "\u00ce",
[0x38] = "\u00cf",
[0x39] = "\u00ef",
[0x3a] = "\u00d4",
[0x3b] = "\u00d9",
[0x3c] = "\u00f9",
[0x3d] = "\u00db",
[0x3e] = "\u00ab",
[0x3f] = "\u00bb",
},
[CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH] = {
[0x20] = "\u00c3",
[0x21] = "\u00e3",
[0x22] = "\u00cd",
[0x23] = "\u00cc",
[0x24] = "\u00ec",
[0x25] = "\u00d2",
[0x26] = "\u00f2",
[0x27] = "\u00d5",
[0x28] = "\u00f5",
[0x29] = "{",
[0x2a] = "}",
[0x2b] = "\\",
[0x2c] = "^",
[0x2d] = "_",
[0x2e] = "|",
[0x2f] = "~",
[0x30] = "\u00c4",
[0x31] = "\u00e4",
[0x32] = "\u00d6",
[0x33] = "\u00f6",
[0x34] = "\u00df",
[0x35] = "\u00a5",
[0x36] = "\u00a4",
[0x37] = "\u00a6",
[0x38] = "\u00c5",
[0x39] = "\u00e5",
[0x3a] = "\u00d8",
[0x3b] = "\u00f8",
[0x3c] = "\u250c",
[0x3d] = "\u2510",
[0x3e] = "\u2514",
[0x3f] = "\u2518",
},
};
static const unsigned char pac2_attribs[32][3] = // Color, font, ident
{
{ CCCOL_WHITE, CCFONT_REGULAR, 0 }, // 0x40 || 0x60
@ -103,6 +213,7 @@ static const unsigned char pac2_attribs[32][3] = // Color, font, ident
struct Screen {
/* +1 is used to compensate null character of string */
uint8_t characters[SCREEN_ROWS][SCREEN_COLUMNS+1];
uint8_t charsets[SCREEN_ROWS][SCREEN_COLUMNS+1];
uint8_t colors[SCREEN_ROWS][SCREEN_COLUMNS+1];
uint8_t fonts[SCREEN_ROWS][SCREEN_COLUMNS+1];
/*
@ -123,6 +234,7 @@ typedef struct CCaptionSubContext {
uint8_t cursor_column;
uint8_t cursor_color;
uint8_t cursor_font;
uint8_t cursor_charset;
AVBPrint buffer;
int buffer_changed;
int rollup;
@ -189,6 +301,7 @@ static void flush_decoder(AVCodecContext *avctx)
ctx->cursor_column = 0;
ctx->cursor_font = 0;
ctx->cursor_color = 0;
ctx->cursor_charset = 0;
ctx->active_screen = 0;
ctx->last_real_time = 0;
ctx->screen_touched = 0;
@ -204,10 +317,13 @@ static int write_char(CCaptionSubContext *ctx, struct Screen *screen, char ch)
uint8_t col = ctx->cursor_column;
char *row = screen->characters[ctx->cursor_row];
char *font = screen->fonts[ctx->cursor_row];
char *charset = screen->charsets[ctx->cursor_row];
if (col < SCREEN_COLUMNS) {
row[col] = ch;
font[col] = ctx->cursor_font;
charset[col] = ctx->cursor_charset;
ctx->cursor_charset = CCSET_BASIC_AMERICAN;
if (ch) ctx->cursor_column++;
return 0;
}
@ -306,6 +422,7 @@ static void roll_up(CCaptionSubContext *ctx)
memcpy(screen->characters[i_row], screen->characters[i_row+1], SCREEN_COLUMNS);
memcpy(screen->colors[i_row], screen->colors[i_row+1], SCREEN_COLUMNS);
memcpy(screen->fonts[i_row], screen->fonts[i_row+1], SCREEN_COLUMNS);
memcpy(screen->charsets[i_row], screen->charsets[i_row+1], SCREEN_COLUMNS);
if (CHECK_FLAG(screen->row_used, i_row + 1))
SET_FLAG(screen->row_used, i_row);
}
@ -325,10 +442,12 @@ static int capture_screen(CCaptionSubContext *ctx)
if (CHECK_FLAG(screen->row_used, i)) {
const char *row = screen->characters[i];
const char *font = screen->fonts[i];
const char *charset = screen->charsets[i];
const char *override;
int j = 0;
/* skip leading space */
while (row[j] == ' ')
while (row[j] == ' ' && charset[j] == CCSET_BASIC_AMERICAN)
j++;
for (; j < SCREEN_COLUMNS; j++) {
@ -362,7 +481,12 @@ static int capture_screen(CCaptionSubContext *ctx)
}
}
prev_font = font[j];
av_bprintf(&ctx->buffer, "%s%s%c", e_tag, s_tag, row[j]);
override = charset_overrides[(int)charset[j]][(int)row[j]];
if (override) {
av_bprintf(&ctx->buffer, "%s%s%s", e_tag, s_tag, override);
} else {
av_bprintf(&ctx->buffer, "%s%s%c", e_tag, s_tag, row[j]);
}
}
av_bprintf(&ctx->buffer, "\\N");
}
@ -419,6 +543,7 @@ static void handle_pac(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
ctx->cursor_row = row_map[index] - 1;
ctx->cursor_color = pac2_attribs[lo][0];
ctx->cursor_font = pac2_attribs[lo][1];
ctx->cursor_charset = CCSET_BASIC_AMERICAN;
ctx->cursor_column = 0;
indent = pac2_attribs[lo][2];
for (i = 0; i < indent; i++) {
@ -474,7 +599,25 @@ static void handle_char(CCaptionSubContext *ctx, char hi, char lo, int64_t pts)
SET_FLAG(screen->row_used, ctx->cursor_row);
write_char(ctx, screen, hi);
switch (hi) {
case 0x11:
ctx->cursor_charset = CCSET_SPECIAL_AMERICAN;
break;
case 0x12:
if (ctx->cursor_column > 0)
ctx->cursor_column -= 1;
ctx->cursor_charset = CCSET_EXTENDED_SPANISH_FRENCH_MISC;
break;
case 0x13:
if (ctx->cursor_column > 0)
ctx->cursor_column -= 1;
ctx->cursor_charset = CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH;
break;
default:
ctx->cursor_charset = CCSET_BASIC_AMERICAN;
write_char(ctx, screen, hi);
break;
}
if (lo) {
write_char(ctx, screen, lo);
@ -560,6 +703,9 @@ static void process_cc608(CCaptionSubContext *ctx, int64_t pts, uint8_t hi, uint
ff_dlog(ctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo);
break;
}
} else if (hi >= 0x11 && hi <= 0x13) {
/* Special characters */
handle_char(ctx, hi, lo, pts);
} else if (hi >= 0x20) {
/* Standard characters (always in pairs) */
handle_char(ctx, hi, lo, pts);

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