| /* | |
| * Closed Caption Decoding | |
| * Copyright (c) 2015 Anshul Maheshwari | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| #include <assert.h> | |
| #include "avcodec.h" | |
| #include "ass.h" | |
| #include "codec_internal.h" | |
| #include "libavutil/opt.h" | |
| #define SCREEN_ROWS 15 | |
| #define SCREEN_COLUMNS 32 | |
| #define SET_FLAG(var, val) ( (var) |= ( 1 << (val)) ) | |
| #define UNSET_FLAG(var, val) ( (var) &= ~( 1 << (val)) ) | |
| #define CHECK_FLAG(var, val) ( (var) & ( 1 << (val)) ) | |
| static const AVRational ms_tb = {1, 1000}; | |
| enum cc_mode { | |
| CCMODE_POPON, | |
| CCMODE_PAINTON, | |
| CCMODE_ROLLUP, | |
| CCMODE_TEXT, | |
| }; | |
| enum cc_color_code { | |
| CCCOL_WHITE, | |
| CCCOL_GREEN, | |
| CCCOL_BLUE, | |
| CCCOL_CYAN, | |
| CCCOL_RED, | |
| CCCOL_YELLOW, | |
| CCCOL_MAGENTA, | |
| CCCOL_USERDEFINED, | |
| CCCOL_BLACK, | |
| CCCOL_TRANSPARENT, | |
| }; | |
| enum cc_font { | |
| CCFONT_REGULAR, | |
| CCFONT_ITALICS, | |
| CCFONT_UNDERLINED, | |
| CCFONT_UNDERLINED_ITALICS, | |
| }; | |
| enum cc_charset { | |
| CCSET_BASIC_AMERICAN, | |
| CCSET_SPECIAL_AMERICAN, | |
| CCSET_EXTENDED_SPANISH_FRENCH_MISC, | |
| CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH, | |
| }; | |
| #define CHARSET_OVERRIDE_LIST(START_SET, ENTRY, END_SET) \ | |
| START_SET(CCSET_BASIC_AMERICAN) \ | |
| ENTRY(0x27, "\u2019") \ | |
| ENTRY(0x2a, "\u00e1") \ | |
| ENTRY(0x5c, "\u00e9") \ | |
| ENTRY(0x5e, "\u00ed") \ | |
| ENTRY(0x5f, "\u00f3") \ | |
| ENTRY(0x60, "\u00fa") \ | |
| ENTRY(0x7b, "\u00e7") \ | |
| ENTRY(0x7c, "\u00f7") \ | |
| ENTRY(0x7d, "\u00d1") \ | |
| ENTRY(0x7e, "\u00f1") \ | |
| ENTRY(0x7f, "\u2588") \ | |
| END_SET \ | |
| START_SET(CCSET_SPECIAL_AMERICAN) \ | |
| ENTRY(0x30, "\u00ae") \ | |
| ENTRY(0x31, "\u00b0") \ | |
| ENTRY(0x32, "\u00bd") \ | |
| ENTRY(0x33, "\u00bf") \ | |
| ENTRY(0x34, "\u2122") \ | |
| ENTRY(0x35, "\u00a2") \ | |
| ENTRY(0x36, "\u00a3") \ | |
| ENTRY(0x37, "\u266a") \ | |
| ENTRY(0x38, "\u00e0") \ | |
| ENTRY(0x39, "\u00A0") \ | |
| ENTRY(0x3a, "\u00e8") \ | |
| ENTRY(0x3b, "\u00e2") \ | |
| ENTRY(0x3c, "\u00ea") \ | |
| ENTRY(0x3d, "\u00ee") \ | |
| ENTRY(0x3e, "\u00f4") \ | |
| ENTRY(0x3f, "\u00fb") \ | |
| END_SET \ | |
| START_SET(CCSET_EXTENDED_SPANISH_FRENCH_MISC) \ | |
| ENTRY(0x20, "\u00c1") \ | |
| ENTRY(0x21, "\u00c9") \ | |
| ENTRY(0x22, "\u00d3") \ | |
| ENTRY(0x23, "\u00da") \ | |
| ENTRY(0x24, "\u00dc") \ | |
| ENTRY(0x25, "\u00fc") \ | |
| ENTRY(0x26, "\u00b4") \ | |
| ENTRY(0x27, "\u00a1") \ | |
| ENTRY(0x28, "*") \ | |
| ENTRY(0x29, "\u2018") \ | |
| ENTRY(0x2a, "-") \ | |
| ENTRY(0x2b, "\u00a9") \ | |
| ENTRY(0x2c, "\u2120") \ | |
| ENTRY(0x2d, "\u00b7") \ | |
| ENTRY(0x2e, "\u201c") \ | |
| ENTRY(0x2f, "\u201d") \ | |
| ENTRY(0x30, "\u00c0") \ | |
| ENTRY(0x31, "\u00c2") \ | |
| ENTRY(0x32, "\u00c7") \ | |
| ENTRY(0x33, "\u00c8") \ | |
| ENTRY(0x34, "\u00ca") \ | |
| ENTRY(0x35, "\u00cb") \ | |
| ENTRY(0x36, "\u00eb") \ | |
| ENTRY(0x37, "\u00ce") \ | |
| ENTRY(0x38, "\u00cf") \ | |
| ENTRY(0x39, "\u00ef") \ | |
| ENTRY(0x3a, "\u00d4") \ | |
| ENTRY(0x3b, "\u00d9") \ | |
| ENTRY(0x3c, "\u00f9") \ | |
| ENTRY(0x3d, "\u00db") \ | |
| ENTRY(0x3e, "\u00ab") \ | |
| ENTRY(0x3f, "\u00bb") \ | |
| END_SET \ | |
| START_SET(CCSET_EXTENDED_PORTUGUESE_GERMAN_DANISH) \ | |
| ENTRY(0x20, "\u00c3") \ | |
| ENTRY(0x21, "\u00e3") \ | |
| ENTRY(0x22, "\u00cd") \ | |
| ENTRY(0x23, "\u00cc") \ | |
| ENTRY(0x24, "\u00ec") \ | |
| ENTRY(0x25, "\u00d2") \ | |
| ENTRY(0x26, "\u00f2") \ | |
| ENTRY(0x27, "\u00d5") \ | |
| ENTRY(0x28, "\u00f5") \ | |
| ENTRY(0x29, "{") \ | |
| ENTRY(0x2a, "}") \ | |
| ENTRY(0x2b, "\\") \ | |
| ENTRY(0x2c, "^") \ | |
| ENTRY(0x2d, "_") \ | |
| ENTRY(0x2e, "|") \ | |
| ENTRY(0x2f, "~") \ | |
| ENTRY(0x30, "\u00c4") \ | |
| ENTRY(0x31, "\u00e4") \ | |
| ENTRY(0x32, "\u00d6") \ | |
| ENTRY(0x33, "\u00f6") \ | |
| ENTRY(0x34, "\u00df") \ | |
| ENTRY(0x35, "\u00a5") \ | |
| ENTRY(0x36, "\u00a4") \ | |
| ENTRY(0x37, "\u00a6") \ | |
| ENTRY(0x38, "\u00c5") \ | |
| ENTRY(0x39, "\u00e5") \ | |
| ENTRY(0x3a, "\u00d8") \ | |
| ENTRY(0x3b, "\u00f8") \ | |
| ENTRY(0x3c, "\u250c") \ | |
| ENTRY(0x3d, "\u2510") \ | |
| ENTRY(0x3e, "\u2514") \ | |
| ENTRY(0x3f, "\u2518") \ | |
| END_SET \ | |
| static const char charset_overrides[4][128][sizeof("\u266a")] = | |
| { | |
| #define START_SET(IDX) \ | |
| [IDX] = { | |
| #define ENTRY(idx, string) \ | |
| [idx] = string, | |
| #define END_SET \ | |
| }, | |
| CHARSET_OVERRIDE_LIST(START_SET, ENTRY, END_SET) | |
| }; | |
| #define EMPTY_START(IDX) | |
| #define EMPTY_END | |
| #define ASSERT_ENTRY(IDX, str) \ | |
| static_assert(sizeof(str) <= sizeof(charset_overrides[0][0]), \ | |
| "'" str "' string takes too much space"); | |
| CHARSET_OVERRIDE_LIST(EMPTY_START, ASSERT_ENTRY, EMPTY_END) | |
| static const unsigned char bg_attribs[8] = // Color | |
| { | |
| CCCOL_WHITE, | |
| CCCOL_GREEN, | |
| CCCOL_BLUE, | |
| CCCOL_CYAN, | |
| CCCOL_RED, | |
| CCCOL_YELLOW, | |
| CCCOL_MAGENTA, | |
| CCCOL_BLACK, | |
| }; | |
| static const unsigned char pac2_attribs[32][3] = // Color, font, ident | |
| { | |
| { CCCOL_WHITE, CCFONT_REGULAR, 0 }, // 0x40 || 0x60 | |
| { CCCOL_WHITE, CCFONT_UNDERLINED, 0 }, // 0x41 || 0x61 | |
| { CCCOL_GREEN, CCFONT_REGULAR, 0 }, // 0x42 || 0x62 | |
| { CCCOL_GREEN, CCFONT_UNDERLINED, 0 }, // 0x43 || 0x63 | |
| { CCCOL_BLUE, CCFONT_REGULAR, 0 }, // 0x44 || 0x64 | |
| { CCCOL_BLUE, CCFONT_UNDERLINED, 0 }, // 0x45 || 0x65 | |
| { CCCOL_CYAN, CCFONT_REGULAR, 0 }, // 0x46 || 0x66 | |
| { CCCOL_CYAN, CCFONT_UNDERLINED, 0 }, // 0x47 || 0x67 | |
| { CCCOL_RED, CCFONT_REGULAR, 0 }, // 0x48 || 0x68 | |
| { CCCOL_RED, CCFONT_UNDERLINED, 0 }, // 0x49 || 0x69 | |
| { CCCOL_YELLOW, CCFONT_REGULAR, 0 }, // 0x4a || 0x6a | |
| { CCCOL_YELLOW, CCFONT_UNDERLINED, 0 }, // 0x4b || 0x6b | |
| { CCCOL_MAGENTA, CCFONT_REGULAR, 0 }, // 0x4c || 0x6c | |
| { CCCOL_MAGENTA, CCFONT_UNDERLINED, 0 }, // 0x4d || 0x6d | |
| { CCCOL_WHITE, CCFONT_ITALICS, 0 }, // 0x4e || 0x6e | |
| { CCCOL_WHITE, CCFONT_UNDERLINED_ITALICS, 0 }, // 0x4f || 0x6f | |
| { CCCOL_WHITE, CCFONT_REGULAR, 0 }, // 0x50 || 0x70 | |
| { CCCOL_WHITE, CCFONT_UNDERLINED, 0 }, // 0x51 || 0x71 | |
| { CCCOL_WHITE, CCFONT_REGULAR, 4 }, // 0x52 || 0x72 | |
| { CCCOL_WHITE, CCFONT_UNDERLINED, 4 }, // 0x53 || 0x73 | |
| { CCCOL_WHITE, CCFONT_REGULAR, 8 }, // 0x54 || 0x74 | |
| { CCCOL_WHITE, CCFONT_UNDERLINED, 8 }, // 0x55 || 0x75 | |
| { CCCOL_WHITE, CCFONT_REGULAR, 12 }, // 0x56 || 0x76 | |
| { CCCOL_WHITE, CCFONT_UNDERLINED, 12 }, // 0x57 || 0x77 | |
| { CCCOL_WHITE, CCFONT_REGULAR, 16 }, // 0x58 || 0x78 | |
| { CCCOL_WHITE, CCFONT_UNDERLINED, 16 }, // 0x59 || 0x79 | |
| { CCCOL_WHITE, CCFONT_REGULAR, 20 }, // 0x5a || 0x7a | |
| { CCCOL_WHITE, CCFONT_UNDERLINED, 20 }, // 0x5b || 0x7b | |
| { CCCOL_WHITE, CCFONT_REGULAR, 24 }, // 0x5c || 0x7c | |
| { CCCOL_WHITE, CCFONT_UNDERLINED, 24 }, // 0x5d || 0x7d | |
| { CCCOL_WHITE, CCFONT_REGULAR, 28 }, // 0x5e || 0x7e | |
| { CCCOL_WHITE, CCFONT_UNDERLINED, 28 } // 0x5f || 0x7f | |
| /* total 32 entries */ | |
| }; | |
| struct Screen { | |
| /* +1 is used to compensate null character of string */ | |
| uint8_t characters[SCREEN_ROWS+1][SCREEN_COLUMNS+1]; | |
| uint8_t charsets[SCREEN_ROWS+1][SCREEN_COLUMNS+1]; | |
| uint8_t colors[SCREEN_ROWS+1][SCREEN_COLUMNS+1]; | |
| uint8_t bgs[SCREEN_ROWS+1][SCREEN_COLUMNS+1]; | |
| uint8_t fonts[SCREEN_ROWS+1][SCREEN_COLUMNS+1]; | |
| /* | |
| * Bitmask of used rows; if a bit is not set, the | |
| * corresponding row is not used. | |
| * for setting row 1 use row | (1 << 0) | |
| * for setting row 15 use row | (1 << 14) | |
| */ | |
| int16_t row_used; | |
| }; | |
| typedef struct CCaptionSubContext { | |
| AVClass *class; | |
| int real_time; | |
| int real_time_latency_msec; | |
| int data_field; | |
| struct Screen screen[2]; | |
| int active_screen; | |
| uint8_t cursor_row; | |
| uint8_t cursor_column; | |
| uint8_t cursor_color; | |
| uint8_t bg_color; | |
| uint8_t cursor_font; | |
| uint8_t cursor_charset; | |
| AVBPrint buffer[2]; | |
| int buffer_index; | |
| int buffer_changed; | |
| int rollup; | |
| enum cc_mode mode; | |
| int64_t buffer_time[2]; | |
| int screen_touched; | |
| int64_t last_real_time; | |
| uint8_t prev_cmd[2]; | |
| int readorder; | |
| } CCaptionSubContext; | |
| static av_cold int init_decoder(AVCodecContext *avctx) | |
| { | |
| CCaptionSubContext *ctx = avctx->priv_data; | |
| av_bprint_init(&ctx->buffer[0], 0, AV_BPRINT_SIZE_UNLIMITED); | |
| av_bprint_init(&ctx->buffer[1], 0, AV_BPRINT_SIZE_UNLIMITED); | |
| /* taking by default roll up to 2 */ | |
| ctx->mode = CCMODE_ROLLUP; | |
| ctx->bg_color = CCCOL_BLACK; | |
| ctx->rollup = 2; | |
| ctx->cursor_row = 10; | |
| return ff_ass_subtitle_header(avctx, "Monospace", | |
| ASS_DEFAULT_FONT_SIZE, | |
| ASS_DEFAULT_COLOR, | |
| ASS_DEFAULT_BACK_COLOR, | |
| ASS_DEFAULT_BOLD, | |
| ASS_DEFAULT_ITALIC, | |
| ASS_DEFAULT_UNDERLINE, | |
| 3, | |
| ASS_DEFAULT_ALIGNMENT); | |
| } | |
| static av_cold int close_decoder(AVCodecContext *avctx) | |
| { | |
| CCaptionSubContext *ctx = avctx->priv_data; | |
| av_bprint_finalize(&ctx->buffer[0], NULL); | |
| av_bprint_finalize(&ctx->buffer[1], NULL); | |
| return 0; | |
| } | |
| static void flush_decoder(AVCodecContext *avctx) | |
| { | |
| CCaptionSubContext *ctx = avctx->priv_data; | |
| ctx->screen[0].row_used = 0; | |
| ctx->screen[1].row_used = 0; | |
| ctx->prev_cmd[0] = 0; | |
| ctx->prev_cmd[1] = 0; | |
| ctx->mode = CCMODE_ROLLUP; | |
| ctx->rollup = 2; | |
| ctx->cursor_row = 10; | |
| ctx->cursor_column = 0; | |
| ctx->cursor_font = 0; | |
| ctx->cursor_color = 0; | |
| ctx->bg_color = CCCOL_BLACK; | |
| ctx->cursor_charset = 0; | |
| ctx->active_screen = 0; | |
| ctx->last_real_time = 0; | |
| ctx->screen_touched = 0; | |
| ctx->buffer_changed = 0; | |
| if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP)) | |
| ctx->readorder = 0; | |
| av_bprint_clear(&ctx->buffer[0]); | |
| av_bprint_clear(&ctx->buffer[1]); | |
| } | |
| /** | |
| * @param ctx closed caption context just to print log | |
| */ | |
| static void 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 *color = screen->colors[ctx->cursor_row]; | |
| char *bg = screen->bgs[ctx->cursor_row]; | |
| char *charset = screen->charsets[ctx->cursor_row]; | |
| if (col < SCREEN_COLUMNS) { | |
| row[col] = ch; | |
| font[col] = ctx->cursor_font; | |
| color[col] = ctx->cursor_color; | |
| bg[col] = ctx->bg_color; | |
| charset[col] = ctx->cursor_charset; | |
| ctx->cursor_charset = CCSET_BASIC_AMERICAN; | |
| if (ch) ctx->cursor_column++; | |
| return; | |
| } | |
| /* We have extra space at end only for null character */ | |
| else if (col == SCREEN_COLUMNS && ch == 0) { | |
| row[col] = ch; | |
| return; | |
| } | |
| else { | |
| av_log(ctx, AV_LOG_WARNING, "Data ignored due to columns exceeding screen width\n"); | |
| return; | |
| } | |
| } | |
| /** | |
| * This function after validating parity bit, also remove it from data pair. | |
| * The first byte doesn't pass parity, we replace it with a solid blank | |
| * and process the pair. | |
| * If the second byte doesn't pass parity, it returns INVALIDDATA | |
| * user can ignore the whole pair and pass the other pair. | |
| */ | |
| static int validate_cc_data_pair(const uint8_t *cc_data_pair, uint8_t *hi) | |
| { | |
| uint8_t cc_valid = (*cc_data_pair & 4) >>2; | |
| uint8_t cc_type = *cc_data_pair & 3; | |
| *hi = cc_data_pair[1]; | |
| if (!cc_valid) | |
| return AVERROR_INVALIDDATA; | |
| // if EIA-608 data then verify parity. | |
| if (cc_type==0 || cc_type==1) { | |
| if (!av_parity(cc_data_pair[2])) { | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if (!av_parity(cc_data_pair[1])) { | |
| *hi = 0x7F; | |
| } | |
| } | |
| //Skip non-data | |
| if ((cc_data_pair[0] == 0xFA || cc_data_pair[0] == 0xFC || cc_data_pair[0] == 0xFD) | |
| && (cc_data_pair[1] & 0x7F) == 0 && (cc_data_pair[2] & 0x7F) == 0) | |
| return AVERROR_PATCHWELCOME; | |
| //skip 708 data | |
| if (cc_type == 3 || cc_type == 2) | |
| return AVERROR_PATCHWELCOME; | |
| return 0; | |
| } | |
| static struct Screen *get_writing_screen(CCaptionSubContext *ctx) | |
| { | |
| switch (ctx->mode) { | |
| case CCMODE_POPON: | |
| // use Inactive screen | |
| return ctx->screen + !ctx->active_screen; | |
| case CCMODE_PAINTON: | |
| case CCMODE_ROLLUP: | |
| case CCMODE_TEXT: | |
| // use active screen | |
| return ctx->screen + ctx->active_screen; | |
| } | |
| /* It was never an option */ | |
| return NULL; | |
| } | |
| static void roll_up(CCaptionSubContext *ctx) | |
| { | |
| struct Screen *screen; | |
| int i, keep_lines; | |
| if (ctx->mode == CCMODE_TEXT) | |
| return; | |
| screen = get_writing_screen(ctx); | |
| /* +1 signify cursor_row starts from 0 | |
| * Can't keep lines less then row cursor pos | |
| */ | |
| keep_lines = FFMIN(ctx->cursor_row + 1, ctx->rollup); | |
| for (i = 0; i < SCREEN_ROWS; i++) { | |
| if (i > ctx->cursor_row - keep_lines && i <= ctx->cursor_row) | |
| continue; | |
| UNSET_FLAG(screen->row_used, i); | |
| } | |
| for (i = 0; i < keep_lines && screen->row_used; i++) { | |
| const int i_row = ctx->cursor_row - keep_lines + i + 1; | |
| 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->bgs[i_row], screen->bgs[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); | |
| } | |
| UNSET_FLAG(screen->row_used, ctx->cursor_row); | |
| } | |
| static int capture_screen(CCaptionSubContext *ctx) | |
| { | |
| int i, j, tab = 0; | |
| struct Screen *screen = ctx->screen + ctx->active_screen; | |
| enum cc_font prev_font = CCFONT_REGULAR; | |
| enum cc_color_code prev_color = CCCOL_WHITE; | |
| enum cc_color_code prev_bg_color = CCCOL_BLACK; | |
| const int bidx = ctx->buffer_index; | |
| av_bprint_clear(&ctx->buffer[bidx]); | |
| for (i = 0; screen->row_used && i < SCREEN_ROWS; i++) | |
| { | |
| if (CHECK_FLAG(screen->row_used, i)) { | |
| const char *row = screen->characters[i]; | |
| const char *charset = screen->charsets[i]; | |
| j = 0; | |
| while (row[j] == ' ' && charset[j] == CCSET_BASIC_AMERICAN) | |
| j++; | |
| if (!tab || j < tab) | |
| tab = j; | |
| } | |
| } | |
| for (i = 0; screen->row_used && i < SCREEN_ROWS; i++) | |
| { | |
| if (CHECK_FLAG(screen->row_used, i)) { | |
| const char *row = screen->characters[i]; | |
| const char *font = screen->fonts[i]; | |
| const char *bg = screen->bgs[i]; | |
| const char *color = screen->colors[i]; | |
| const char *charset = screen->charsets[i]; | |
| const char *override; | |
| int x, y, seen_char = 0; | |
| j = 0; | |
| /* skip leading space */ | |
| while (row[j] == ' ' && charset[j] == CCSET_BASIC_AMERICAN && j < tab) | |
| j++; | |
| x = ASS_DEFAULT_PLAYRESX * (0.1 + 0.0250 * j); | |
| y = ASS_DEFAULT_PLAYRESY * (0.1 + 0.0533 * i); | |
| av_bprintf(&ctx->buffer[bidx], "{\\an7}{\\pos(%d,%d)}", x, y); | |
| for (; j < SCREEN_COLUMNS; j++) { | |
| const char *e_tag = "", *s_tag = "", *c_tag = "", *b_tag = ""; | |
| if (row[j] == 0) | |
| break; | |
| if (prev_font != font[j]) { | |
| switch (prev_font) { | |
| case CCFONT_ITALICS: | |
| e_tag = "{\\i0}"; | |
| break; | |
| case CCFONT_UNDERLINED: | |
| e_tag = "{\\u0}"; | |
| break; | |
| case CCFONT_UNDERLINED_ITALICS: | |
| e_tag = "{\\u0}{\\i0}"; | |
| break; | |
| } | |
| switch (font[j]) { | |
| case CCFONT_ITALICS: | |
| s_tag = "{\\i1}"; | |
| break; | |
| case CCFONT_UNDERLINED: | |
| s_tag = "{\\u1}"; | |
| break; | |
| case CCFONT_UNDERLINED_ITALICS: | |
| s_tag = "{\\u1}{\\i1}"; | |
| break; | |
| } | |
| } | |
| if (prev_color != color[j]) { | |
| switch (color[j]) { | |
| case CCCOL_WHITE: | |
| c_tag = "{\\c&HFFFFFF&}"; | |
| break; | |
| case CCCOL_GREEN: | |
| c_tag = "{\\c&H00FF00&}"; | |
| break; | |
| case CCCOL_BLUE: | |
| c_tag = "{\\c&HFF0000&}"; | |
| break; | |
| case CCCOL_CYAN: | |
| c_tag = "{\\c&HFFFF00&}"; | |
| break; | |
| case CCCOL_RED: | |
| c_tag = "{\\c&H0000FF&}"; | |
| break; | |
| case CCCOL_YELLOW: | |
| c_tag = "{\\c&H00FFFF&}"; | |
| break; | |
| case CCCOL_MAGENTA: | |
| c_tag = "{\\c&HFF00FF&}"; | |
| break; | |
| } | |
| } | |
| if (prev_bg_color != bg[j]) { | |
| switch (bg[j]) { | |
| case CCCOL_WHITE: | |
| b_tag = "{\\3c&HFFFFFF&}"; | |
| break; | |
| case CCCOL_GREEN: | |
| b_tag = "{\\3c&H00FF00&}"; | |
| break; | |
| case CCCOL_BLUE: | |
| b_tag = "{\\3c&HFF0000&}"; | |
| break; | |
| case CCCOL_CYAN: | |
| b_tag = "{\\3c&HFFFF00&}"; | |
| break; | |
| case CCCOL_RED: | |
| b_tag = "{\\3c&H0000FF&}"; | |
| break; | |
| case CCCOL_YELLOW: | |
| b_tag = "{\\3c&H00FFFF&}"; | |
| break; | |
| case CCCOL_MAGENTA: | |
| b_tag = "{\\3c&HFF00FF&}"; | |
| break; | |
| case CCCOL_BLACK: | |
| b_tag = "{\\3c&H000000&}"; | |
| break; | |
| } | |
| } | |
| prev_font = font[j]; | |
| prev_color = color[j]; | |
| prev_bg_color = bg[j]; | |
| override = charset_overrides[(int)charset[j]][(int)row[j]]; | |
| if (override[0]) { | |
| av_bprintf(&ctx->buffer[bidx], "%s%s%s%s%s", e_tag, s_tag, c_tag, b_tag, override); | |
| seen_char = 1; | |
| } else if (row[j] == ' ' && !seen_char) { | |
| av_bprintf(&ctx->buffer[bidx], "%s%s%s%s\\h", e_tag, s_tag, c_tag, b_tag); | |
| } else { | |
| av_bprintf(&ctx->buffer[bidx], "%s%s%s%s%c", e_tag, s_tag, c_tag, b_tag, row[j]); | |
| seen_char = 1; | |
| } | |
| } | |
| av_bprintf(&ctx->buffer[bidx], "\\N"); | |
| } | |
| } | |
| if (!av_bprint_is_complete(&ctx->buffer[bidx])) | |
| return AVERROR(ENOMEM); | |
| if (screen->row_used && ctx->buffer[bidx].len >= 2) { | |
| ctx->buffer[bidx].len -= 2; | |
| ctx->buffer[bidx].str[ctx->buffer[bidx].len] = 0; | |
| } | |
| ctx->buffer_changed = 1; | |
| return 0; | |
| } | |
| static void update_time(CCaptionSubContext *ctx, int64_t pts) | |
| { | |
| ctx->buffer_time[0] = ctx->buffer_time[1]; | |
| ctx->buffer_time[1] = pts; | |
| } | |
| static void handle_bgattr(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo) | |
| { | |
| const int i = (lo & 0xf) >> 1; | |
| ctx->bg_color = bg_attribs[i]; | |
| } | |
| static void handle_textattr(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo) | |
| { | |
| int i = lo - 0x20; | |
| struct Screen *screen = get_writing_screen(ctx); | |
| if (i >= 32) | |
| return; | |
| ctx->cursor_color = pac2_attribs[i][0]; | |
| ctx->cursor_font = pac2_attribs[i][1]; | |
| SET_FLAG(screen->row_used, ctx->cursor_row); | |
| write_char(ctx, screen, ' '); | |
| } | |
| static void handle_pac(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo) | |
| { | |
| static const int8_t row_map[] = { | |
| 11, -1, 1, 2, 3, 4, 12, 13, 14, 15, 5, 6, 7, 8, 9, 10 | |
| }; | |
| const int index = ( (hi<<1) & 0x0e) | ( (lo>>5) & 0x01 ); | |
| struct Screen *screen = get_writing_screen(ctx); | |
| int indent, i; | |
| if (row_map[index] <= 0) { | |
| av_log(ctx, AV_LOG_DEBUG, "Invalid pac index encountered\n"); | |
| return; | |
| } | |
| lo &= 0x1f; | |
| 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++) { | |
| write_char(ctx, screen, ' '); | |
| } | |
| } | |
| static int handle_edm(CCaptionSubContext *ctx) | |
| { | |
| struct Screen *screen = ctx->screen + ctx->active_screen; | |
| int ret; | |
| // In buffered mode, keep writing to screen until it is wiped. | |
| // Before wiping the display, capture contents to emit subtitle. | |
| if (!ctx->real_time) | |
| ret = capture_screen(ctx); | |
| screen->row_used = 0; | |
| ctx->bg_color = CCCOL_BLACK; | |
| // In realtime mode, emit an empty caption so the last one doesn't | |
| // stay on the screen. | |
| if (ctx->real_time) | |
| ret = capture_screen(ctx); | |
| return ret; | |
| } | |
| static int handle_eoc(CCaptionSubContext *ctx) | |
| { | |
| int ret; | |
| ctx->active_screen = !ctx->active_screen; | |
| // In buffered mode, we wait til the *next* EOC and | |
| // capture what was already on the screen since the last EOC. | |
| if (!ctx->real_time) | |
| ret = handle_edm(ctx); | |
| ctx->cursor_column = 0; | |
| // In realtime mode, we display the buffered contents (after | |
| // flipping the buffer to active above) as soon as EOC arrives. | |
| if (ctx->real_time) | |
| ret = capture_screen(ctx); | |
| return ret; | |
| } | |
| static void handle_delete_end_of_row(CCaptionSubContext *ctx) | |
| { | |
| struct Screen *screen = get_writing_screen(ctx); | |
| write_char(ctx, screen, 0); | |
| } | |
| static void handle_char(CCaptionSubContext *ctx, char hi, char lo) | |
| { | |
| struct Screen *screen = get_writing_screen(ctx); | |
| SET_FLAG(screen->row_used, ctx->cursor_row); | |
| 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); | |
| } | |
| write_char(ctx, screen, 0); | |
| if (ctx->mode != CCMODE_POPON) | |
| ctx->screen_touched = 1; | |
| if (lo) | |
| ff_dlog(ctx, "(%c,%c)\n", hi, lo); | |
| else | |
| ff_dlog(ctx, "(%c)\n", hi); | |
| } | |
| static int process_cc608(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo) | |
| { | |
| int ret = 0; | |
| if (hi == ctx->prev_cmd[0] && lo == ctx->prev_cmd[1]) { | |
| return 0; | |
| } | |
| /* set prev command */ | |
| ctx->prev_cmd[0] = hi; | |
| ctx->prev_cmd[1] = lo; | |
| if ( (hi == 0x10 && (lo >= 0x40 && lo <= 0x5f)) || | |
| ( (hi >= 0x11 && hi <= 0x17) && (lo >= 0x40 && lo <= 0x7f) ) ) { | |
| handle_pac(ctx, hi, lo); | |
| } else if ( ( hi == 0x11 && lo >= 0x20 && lo <= 0x2f ) || | |
| ( hi == 0x17 && lo >= 0x2e && lo <= 0x2f) ) { | |
| handle_textattr(ctx, hi, lo); | |
| } else if ((hi == 0x10 && lo >= 0x20 && lo <= 0x2f)) { | |
| handle_bgattr(ctx, hi, lo); | |
| } else if (hi == 0x14 || hi == 0x15 || hi == 0x1c) { | |
| switch (lo) { | |
| case 0x20: | |
| /* resume caption loading */ | |
| ctx->mode = CCMODE_POPON; | |
| break; | |
| case 0x24: | |
| handle_delete_end_of_row(ctx); | |
| break; | |
| case 0x25: | |
| case 0x26: | |
| case 0x27: | |
| ctx->rollup = lo - 0x23; | |
| ctx->mode = CCMODE_ROLLUP; | |
| break; | |
| case 0x29: | |
| /* resume direct captioning */ | |
| ctx->mode = CCMODE_PAINTON; | |
| break; | |
| case 0x2b: | |
| /* resume text display */ | |
| ctx->mode = CCMODE_TEXT; | |
| break; | |
| case 0x2c: | |
| /* erase display memory */ | |
| handle_edm(ctx); | |
| break; | |
| case 0x2d: | |
| /* carriage return */ | |
| ff_dlog(ctx, "carriage return\n"); | |
| if (!ctx->real_time) | |
| ret = capture_screen(ctx); | |
| roll_up(ctx); | |
| ctx->cursor_column = 0; | |
| break; | |
| case 0x2e: | |
| /* erase buffered (non displayed) memory */ | |
| // Only in realtime mode. In buffered mode, we re-use the inactive screen | |
| // for our own buffering. | |
| if (ctx->real_time) { | |
| struct Screen *screen = ctx->screen + !ctx->active_screen; | |
| screen->row_used = 0; | |
| } | |
| break; | |
| case 0x2f: | |
| /* end of caption */ | |
| ff_dlog(ctx, "handle_eoc\n"); | |
| ret = handle_eoc(ctx); | |
| break; | |
| default: | |
| 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); | |
| } else if (hi >= 0x20) { | |
| /* Standard characters (always in pairs) */ | |
| handle_char(ctx, hi, lo); | |
| ctx->prev_cmd[0] = ctx->prev_cmd[1] = 0; | |
| } else if (hi == 0x17 && lo >= 0x21 && lo <= 0x23) { | |
| int i; | |
| /* Tab offsets (spacing) */ | |
| for (i = 0; i < lo - 0x20; i++) { | |
| handle_char(ctx, ' ', 0); | |
| } | |
| } else { | |
| /* Ignoring all other non data code */ | |
| ff_dlog(ctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo); | |
| } | |
| return ret; | |
| } | |
| static int decode(AVCodecContext *avctx, AVSubtitle *sub, | |
| int *got_sub, const AVPacket *avpkt) | |
| { | |
| CCaptionSubContext *ctx = avctx->priv_data; | |
| int64_t in_time = sub->pts; | |
| int64_t start_time; | |
| int64_t end_time; | |
| int bidx = ctx->buffer_index; | |
| const uint8_t *bptr = avpkt->data; | |
| int len = avpkt->size; | |
| int ret = 0; | |
| int i; | |
| unsigned nb_rect_allocated = 0; | |
| for (i = 0; i < len; i += 3) { | |
| uint8_t hi, cc_type = bptr[i] & 1; | |
| if (ctx->data_field < 0) | |
| ctx->data_field = cc_type; | |
| if (validate_cc_data_pair(bptr + i, &hi)) | |
| continue; | |
| if (cc_type != ctx->data_field) | |
| continue; | |
| ret = process_cc608(ctx, hi & 0x7f, bptr[i + 2] & 0x7f); | |
| if (ret < 0) | |
| return ret; | |
| if (!ctx->buffer_changed) | |
| continue; | |
| ctx->buffer_changed = 0; | |
| if (!ctx->real_time && ctx->mode == CCMODE_POPON) | |
| ctx->buffer_index = bidx = !ctx->buffer_index; | |
| update_time(ctx, in_time); | |
| if (ctx->buffer[bidx].str[0] || ctx->real_time) { | |
| ff_dlog(ctx, "cdp writing data (%s)\n", ctx->buffer[bidx].str); | |
| start_time = ctx->buffer_time[0]; | |
| sub->pts = start_time; | |
| end_time = ctx->buffer_time[1]; | |
| if (!ctx->real_time) | |
| sub->end_display_time = av_rescale_q(end_time - start_time, | |
| AV_TIME_BASE_Q, ms_tb); | |
| else | |
| sub->end_display_time = -1; | |
| ret = ff_ass_add_rect2(sub, ctx->buffer[bidx].str, ctx->readorder++, 0, NULL, NULL, &nb_rect_allocated); | |
| if (ret < 0) | |
| return ret; | |
| ctx->last_real_time = sub->pts; | |
| ctx->screen_touched = 0; | |
| } | |
| } | |
| if (!bptr && !ctx->real_time && ctx->buffer[!ctx->buffer_index].str[0]) { | |
| bidx = !ctx->buffer_index; | |
| ret = ff_ass_add_rect2(sub, ctx->buffer[bidx].str, ctx->readorder++, 0, NULL, NULL, &nb_rect_allocated); | |
| if (ret < 0) | |
| return ret; | |
| av_bprint_clear(&ctx->buffer[bidx]); | |
| sub->pts = ctx->buffer_time[1]; | |
| sub->end_display_time = av_rescale_q(ctx->buffer_time[1] - ctx->buffer_time[0], | |
| AV_TIME_BASE_Q, ms_tb); | |
| if (sub->end_display_time == 0) | |
| sub->end_display_time = ctx->buffer[bidx].len * 20; | |
| } | |
| if (ctx->real_time && ctx->screen_touched && | |
| sub->pts >= ctx->last_real_time + av_rescale_q(ctx->real_time_latency_msec, ms_tb, AV_TIME_BASE_Q)) { | |
| ctx->last_real_time = sub->pts; | |
| ctx->screen_touched = 0; | |
| capture_screen(ctx); | |
| ctx->buffer_changed = 0; | |
| ret = ff_ass_add_rect2(sub, ctx->buffer[bidx].str, ctx->readorder++, 0, NULL, NULL, &nb_rect_allocated); | |
| if (ret < 0) | |
| return ret; | |
| sub->end_display_time = -1; | |
| } | |
| *got_sub = sub->num_rects > 0; | |
| return avpkt->size; | |
| } | |
| #define OFFSET(x) offsetof(CCaptionSubContext, x) | |
| #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM | |
| static const AVOption options[] = { | |
| { "real_time", "emit subtitle events as they are decoded for real-time display", OFFSET(real_time), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, SD }, | |
| { "real_time_latency_msec", "minimum elapsed time between emitting real-time subtitle events", OFFSET(real_time_latency_msec), AV_OPT_TYPE_INT, { .i64 = 200 }, 0, 500, SD }, | |
| { "data_field", "select data field", OFFSET(data_field), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, SD, .unit = "data_field" }, | |
| { "auto", "pick first one that appears", 0, AV_OPT_TYPE_CONST, { .i64 =-1 }, 0, 0, SD, .unit = "data_field" }, | |
| { "first", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, 0, 0, SD, .unit = "data_field" }, | |
| { "second", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, SD, .unit = "data_field" }, | |
| {NULL} | |
| }; | |
| static const AVClass ccaption_dec_class = { | |
| .class_name = "Closed Captions Decoder", | |
| .item_name = av_default_item_name, | |
| .option = options, | |
| .version = LIBAVUTIL_VERSION_INT, | |
| }; | |
| const FFCodec ff_ccaption_decoder = { | |
| .p.name = "cc_dec", | |
| CODEC_LONG_NAME("Closed Captions (EIA-608 / CEA-708)"), | |
| .p.type = AVMEDIA_TYPE_SUBTITLE, | |
| .p.id = AV_CODEC_ID_EIA_608, | |
| .p.priv_class = &ccaption_dec_class, | |
| .p.capabilities = AV_CODEC_CAP_DELAY, | |
| .priv_data_size = sizeof(CCaptionSubContext), | |
| .init = init_decoder, | |
| .close = close_decoder, | |
| .flush = flush_decoder, | |
| FF_CODEC_DECODE_SUB_CB(decode), | |
| }; |