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/*
* 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 "avcodec.h"
#include "ass.h"
#include "libavutil/opt.h"
#define SCREEN_ROWS 15
#define SCREEN_COLUMNS 32
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#define SET_FLAG(var, val) ( (var) |= ( 1 << (val)) )
#define UNSET_FLAG(var, val) ( (var) &= ~( 1 << (val)) )
#define CHECK_FLAG(var, val) ( (var) & ( 1 << (val)) ) |
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static const AVRational ms_tb = {1, 1000}; |
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|
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/*
* TODO list
* 1) handle font and color completely
*/
enum cc_mode {
CCMODE_POPON,
CCMODE_PAINTON, |
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CCMODE_ROLLUP, |
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CCMODE_TEXT,
};
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enum cc_color_code { |
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CCCOL_WHITE,
CCCOL_GREEN,
CCCOL_BLUE,
CCCOL_CYAN,
CCCOL_RED,
CCCOL_YELLOW,
CCCOL_MAGENTA,
CCCOL_USERDEFINED,
CCCOL_BLACK, |
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CCCOL_TRANSPARENT, |
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};
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enum cc_font { |
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CCFONT_REGULAR,
CCFONT_ITALICS,
CCFONT_UNDERLINED, |
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CCFONT_UNDERLINED_ITALICS, |
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};
|
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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",
},
};
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static const unsigned char pac2_attribs[32][3] = // Color, font, ident |
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{ |
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{ 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 |
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/* total 32 entries */ |
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}; |
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|
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struct Screen {
/* +1 is used to compensate null character of string */
uint8_t characters[SCREEN_ROWS][SCREEN_COLUMNS+1]; |
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uint8_t charsets[SCREEN_ROWS][SCREEN_COLUMNS+1]; |
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uint8_t colors[SCREEN_ROWS][SCREEN_COLUMNS+1];
uint8_t fonts[SCREEN_ROWS][SCREEN_COLUMNS+1]; |
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/*
* Bitmask of used rows; if a bit is not set, the
* corresponding row is not used. |
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* for setting row 1 use row | (1 << 0) |
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* for setting row 15 use row | (1 << 14)
*/ |
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int16_t row_used; |
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};
typedef struct CCaptionSubContext {
AVClass *class; |
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int real_time; |
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struct Screen screen[2];
int active_screen;
uint8_t cursor_row;
uint8_t cursor_column;
uint8_t cursor_color;
uint8_t cursor_font; |
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uint8_t cursor_charset; |
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AVBPrint buffer; |
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int buffer_changed; |
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int rollup; |
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enum cc_mode mode; |
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int64_t start_time;
/* visible screen time */
int64_t startv_time;
int64_t end_time; |
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int screen_touched;
int64_t last_real_time; |
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char prev_cmd[2];
/* buffer to store pkt data */ |
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uint8_t *pktbuf;
int pktbuf_size; |
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int readorder; |
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} CCaptionSubContext; |
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static av_cold int init_decoder(AVCodecContext *avctx)
{
int ret;
CCaptionSubContext *ctx = avctx->priv_data;
av_bprint_init(&ctx->buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
/* taking by default roll up to 2 */ |
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ctx->mode = CCMODE_ROLLUP; |
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ctx->rollup = 2; |
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ctx->cursor_row = 10; |
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ret = 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); |
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if (ret < 0) { |
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return ret; |
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} |
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|
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return ret;
}
static av_cold int close_decoder(AVCodecContext *avctx)
{
CCaptionSubContext *ctx = avctx->priv_data; |
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av_bprint_finalize(&ctx->buffer, NULL); |
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av_freep(&ctx->pktbuf);
ctx->pktbuf_size = 0; |
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return 0;
} |
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|
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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; |
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ctx->cursor_row = 10; |
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ctx->cursor_column = 0;
ctx->cursor_font = 0;
ctx->cursor_color = 0; |
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ctx->cursor_charset = 0; |
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ctx->active_screen = 0; |
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ctx->last_real_time = 0;
ctx->screen_touched = 0; |
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ctx->buffer_changed = 0; |
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if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
ctx->readorder = 0; |
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av_bprint_clear(&ctx->buffer);
}
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/**
* @param ctx closed caption context just to print log
*/ |
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static void write_char(CCaptionSubContext *ctx, struct Screen *screen, char ch) |
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{ |
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uint8_t col = ctx->cursor_column;
char *row = screen->characters[ctx->cursor_row]; |
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char *font = screen->fonts[ctx->cursor_row]; |
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char *charset = screen->charsets[ctx->cursor_row]; |
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|
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if (col < SCREEN_COLUMNS) { |
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row[col] = ch; |
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font[col] = ctx->cursor_font; |
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charset[col] = ctx->cursor_charset;
ctx->cursor_charset = CCSET_BASIC_AMERICAN; |
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if (ch) ctx->cursor_column++; |
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return; |
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}
/* We have extra space at end only for null character */ |
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else if (col == SCREEN_COLUMNS && ch == 0) { |
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row[col] = ch; |
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return; |
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}
else { |
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av_log(ctx, AV_LOG_WARNING, "Data Ignored since exceeding screen width\n"); |
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return; |
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}
} |
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|
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/**
* 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.
*/ |
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static int validate_cc_data_pair(uint8_t *cc_data_pair) |
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{
uint8_t cc_valid = (*cc_data_pair & 4) >>2;
uint8_t cc_type = *cc_data_pair & 3;
if (!cc_valid)
return AVERROR_INVALIDDATA;
// if EIA-608 data then verify parity.
if (cc_type==0 || cc_type==1) { |
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if (!av_parity(cc_data_pair[2])) { |
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return AVERROR_INVALIDDATA;
} |
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if (!av_parity(cc_data_pair[1])) { |
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cc_data_pair[1]=0x7F;
}
}
//Skip non-data |
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if ((cc_data_pair[0] == 0xFA || cc_data_pair[0] == 0xFC || cc_data_pair[0] == 0xFD) |
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&& (cc_data_pair[1] & 0x7F) == 0 && (cc_data_pair[2] & 0x7F) == 0)
return AVERROR_PATCHWELCOME;
//skip 708 data |
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if (cc_type == 3 || cc_type == 2) |
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return AVERROR_PATCHWELCOME;
/* remove parity bit */
cc_data_pair[1] &= 0x7F;
cc_data_pair[2] &= 0x7F;
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: |
6049b15c |
case CCMODE_ROLLUP: |
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case CCMODE_TEXT:
// use active screen
return ctx->screen + ctx->active_screen;
}
/* It was never an option */
return NULL;
}
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static void roll_up(CCaptionSubContext *ctx)
{
struct Screen *screen;
int i, keep_lines;
|
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if (ctx->mode == CCMODE_TEXT) |
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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);
|
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for (i = 0; i < SCREEN_ROWS; i++) {
if (i > ctx->cursor_row - keep_lines && i <= ctx->cursor_row)
continue; |
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UNSET_FLAG(screen->row_used, i); |
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} |
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|
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for (i = 0; i < keep_lines && screen->row_used; i++) { |
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const int i_row = ctx->cursor_row - keep_lines + i + 1;
|
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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); |
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memcpy(screen->charsets[i_row], screen->charsets[i_row+1], SCREEN_COLUMNS); |
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if (CHECK_FLAG(screen->row_used, i_row + 1)) |
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SET_FLAG(screen->row_used, i_row);
} |
9027806e |
|
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UNSET_FLAG(screen->row_used, ctx->cursor_row);
}
|
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static int capture_screen(CCaptionSubContext *ctx) |
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{ |
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int i, j, tab = 0; |
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struct Screen *screen = ctx->screen + ctx->active_screen; |
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enum cc_font prev_font = CCFONT_REGULAR; |
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av_bprint_clear(&ctx->buffer); |
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|
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for (i = 0; screen->row_used && i < SCREEN_ROWS; i++) |
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{ |
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if (CHECK_FLAG(screen->row_used, i)) { |
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const char *row = screen->characters[i]; |
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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]; |
31bff21d |
const char *font = screen->fonts[i]; |
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const char *charset = screen->charsets[i];
const char *override; |
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int x, y, seen_char = 0;
j = 0; |
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/* skip leading space */ |
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while (row[j] == ' ' && charset[j] == CCSET_BASIC_AMERICAN && j < tab) |
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j++;
|
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x = ASS_DEFAULT_PLAYRESX * (0.1 + 0.0250 * j);
y = ASS_DEFAULT_PLAYRESY * (0.1 + 0.0533 * i);
av_bprintf(&ctx->buffer, "{\\an7}{\\pos(%d,%d)}", x, y);
|
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for (; j < SCREEN_COLUMNS; j++) { |
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const char *e_tag = "", *s_tag = "";
|
b7e64be8 |
if (row[j] == 0)
break;
if (prev_font != font[j]) {
switch (prev_font) {
case CCFONT_ITALICS: |
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e_tag = "{\\i0}"; |
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break;
case CCFONT_UNDERLINED: |
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e_tag = "{\\u0}"; |
b7e64be8 |
break;
case CCFONT_UNDERLINED_ITALICS: |
a43deea8 |
e_tag = "{\\u0}{\\i0}"; |
b7e64be8 |
break;
}
switch (font[j]) {
case CCFONT_ITALICS: |
a43deea8 |
s_tag = "{\\i1}"; |
b7e64be8 |
break;
case CCFONT_UNDERLINED: |
a43deea8 |
s_tag = "{\\u1}"; |
b7e64be8 |
break;
case CCFONT_UNDERLINED_ITALICS: |
a43deea8 |
s_tag = "{\\u1}{\\i1}"; |
b7e64be8 |
break;
}
}
prev_font = font[j]; |
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override = charset_overrides[(int)charset[j]][(int)row[j]];
if (override) {
av_bprintf(&ctx->buffer, "%s%s%s", e_tag, s_tag, override); |
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seen_char = 1;
} else if (row[j] == ' ' && !seen_char) {
av_bprintf(&ctx->buffer, "%s%s\\h", e_tag, s_tag); |
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} else {
av_bprintf(&ctx->buffer, "%s%s%c", e_tag, s_tag, row[j]); |
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seen_char = 1; |
5f5467e7 |
} |
9ca96714 |
|
b7e64be8 |
}
av_bprintf(&ctx->buffer, "\\N"); |
bf30161a |
} |
2693275c |
} |
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if (!av_bprint_is_complete(&ctx->buffer))
return AVERROR(ENOMEM); |
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if (screen->row_used && ctx->buffer.len >= 2) { |
a6b630e9 |
ctx->buffer.len -= 2;
ctx->buffer.str[ctx->buffer.len] = 0;
} |
7def844b |
ctx->buffer_changed = 1; |
22765140 |
return 0; |
080de371 |
}
static int reap_screen(CCaptionSubContext *ctx, int64_t pts)
{
ctx->start_time = ctx->startv_time; |
bf30161a |
ctx->startv_time = pts;
ctx->end_time = pts; |
080de371 |
return capture_screen(ctx); |
bf30161a |
}
|
55ca79f5 |
static void handle_textattr(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo) |
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{
int i = lo - 0x20;
struct Screen *screen = get_writing_screen(ctx);
|
55ca79f5 |
if (i >= 32) |
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return;
|
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ctx->cursor_color = pac2_attribs[i][0]; |
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ctx->cursor_font = pac2_attribs[i][1];
|
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SET_FLAG(screen->row_used, ctx->cursor_row); |
086093c7 |
write_char(ctx, screen, ' '); |
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} |
012559f2 |
|
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static void handle_pac(CCaptionSubContext *ctx, uint8_t hi, uint8_t lo) |
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{
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); |
086093c7 |
int indent, i; |
4b626261 |
|
55ca79f5 |
if (row_map[index] <= 0) { |
b261749f |
av_log(ctx, AV_LOG_DEBUG, "Invalid pac index encountered\n"); |
4b626261 |
return; |
f05efd42 |
} |
4b626261 |
lo &= 0x1f;
ctx->cursor_row = row_map[index] - 1;
ctx->cursor_color = pac2_attribs[lo][0];
ctx->cursor_font = pac2_attribs[lo][1]; |
5f5467e7 |
ctx->cursor_charset = CCSET_BASIC_AMERICAN; |
4b626261 |
ctx->cursor_column = 0;
indent = pac2_attribs[lo][2]; |
55ca79f5 |
for (i = 0; i < indent; i++) { |
086093c7 |
write_char(ctx, screen, ' '); |
4b626261 |
}
}
|
578b911b |
/**
* @param pts it is required to set end time
*/
static void handle_edm(CCaptionSubContext *ctx, int64_t pts) |
4b626261 |
{ |
578b911b |
struct Screen *screen = ctx->screen + ctx->active_screen; |
23a50c8a |
|
5c041e2c |
// In buffered mode, keep writing to screen until it is wiped.
// Before wiping the display, capture contents to emit subtitle.
if (!ctx->real_time)
reap_screen(ctx, pts);
|
bf30161a |
screen->row_used = 0; |
5c041e2c |
// In realtime mode, emit an empty caption so the last one doesn't
// stay on the screen.
if (ctx->real_time)
reap_screen(ctx, pts); |
4b626261 |
} |
012559f2 |
|
5695c853 |
static void handle_eoc(CCaptionSubContext *ctx, int64_t pts) |
4b626261 |
{ |
5c041e2c |
// In buffered mode, we wait til the *next* EOC and
// reap what was already on the screen since the last EOC.
if (!ctx->real_time)
handle_edm(ctx,pts);
|
4b626261 |
ctx->active_screen = !ctx->active_screen;
ctx->cursor_column = 0; |
5c041e2c |
// In realtime mode, we display the buffered contents (after
// flipping the buffer to active above) as soon as EOC arrives.
if (ctx->real_time)
reap_screen(ctx, pts); |
4b626261 |
} |
012559f2 |
|
55ca79f5 |
static void handle_delete_end_of_row(CCaptionSubContext *ctx, char hi, char lo) |
4b626261 |
{
struct Screen *screen = get_writing_screen(ctx); |
811ce8f9 |
write_char(ctx, screen, 0); |
4b626261 |
} |
012559f2 |
|
4b626261 |
static void handle_char(CCaptionSubContext *ctx, char hi, char lo, int64_t pts)
{
struct Screen *screen = get_writing_screen(ctx);
|
811ce8f9 |
SET_FLAG(screen->row_used, ctx->cursor_row); |
4b626261 |
|
5f5467e7 |
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;
} |
4b626261 |
|
55ca79f5 |
if (lo) { |
086093c7 |
write_char(ctx, screen, lo); |
4b626261 |
} |
811ce8f9 |
write_char(ctx, screen, 0); |
4b626261 |
|
5c041e2c |
if (ctx->mode != CCMODE_POPON)
ctx->screen_touched = 1;
|
88ba88e8 |
if (lo) |
55ca79f5 |
ff_dlog(ctx, "(%c,%c)\n", hi, lo); |
88ba88e8 |
else |
55ca79f5 |
ff_dlog(ctx, "(%c)\n", hi); |
4b626261 |
} |
012559f2 |
|
5695c853 |
static void process_cc608(CCaptionSubContext *ctx, int64_t pts, uint8_t hi, uint8_t lo) |
4b626261 |
{ |
55ca79f5 |
if (hi == ctx->prev_cmd[0] && lo == ctx->prev_cmd[1]) { |
3ec5d8fe |
/* ignore redundant command */ |
2f26b67d |
return;
}
/* 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) ) ) { |
4b626261 |
handle_pac(ctx, hi, lo);
} else if ( ( hi == 0x11 && lo >= 0x20 && lo <= 0x2f ) ||
( hi == 0x17 && lo >= 0x2e && lo <= 0x2f) ) {
handle_textattr(ctx, hi, lo); |
3ec5d8fe |
} 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, hi, lo);
break;
case 0x25:
case 0x26:
case 0x27: |
0948e0f5 |
ctx->rollup = lo - 0x23; |
6049b15c |
ctx->mode = CCMODE_ROLLUP; |
3ec5d8fe |
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 */ |
578b911b |
handle_edm(ctx, pts); |
3ec5d8fe |
break;
case 0x2d:
/* carriage return */
ff_dlog(ctx, "carriage return\n"); |
5c041e2c |
if (!ctx->real_time)
reap_screen(ctx, pts); |
3ec5d8fe |
roll_up(ctx);
ctx->cursor_column = 0;
break; |
5c041e2c |
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; |
3ec5d8fe |
case 0x2f:
/* end of caption */
ff_dlog(ctx, "handle_eoc\n"); |
5695c853 |
handle_eoc(ctx, pts); |
3ec5d8fe |
break;
default:
ff_dlog(ctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo);
break;
} |
5f5467e7 |
} else if (hi >= 0x11 && hi <= 0x13) {
/* Special characters */
handle_char(ctx, hi, lo, pts); |
b261749f |
} else if (hi >= 0x20) { |
3ec5d8fe |
/* Standard characters (always in pairs) */ |
4b626261 |
handle_char(ctx, hi, lo, pts); |
2f26b67d |
ctx->prev_cmd[0] = ctx->prev_cmd[1] = 0; |
4448f16e |
} else if (hi == 0x17 && lo >= 0x21 && lo <= 0x23) { |
6cc4c422 |
int i; |
4448f16e |
/* Tab offsets (spacing) */ |
6cc4c422 |
for (i = 0; i < lo - 0x20; i++) { |
4448f16e |
handle_char(ctx, ' ', 0, pts);
} |
4b626261 |
} else { |
3ec5d8fe |
/* Ignoring all other non data code */ |
229843aa |
ff_dlog(ctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo); |
4b626261 |
}
} |
012559f2 |
|
4b626261 |
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
{
CCaptionSubContext *ctx = avctx->priv_data;
AVSubtitle *sub = data; |
d8620158 |
const int64_t start_time = sub->pts; |
4b626261 |
uint8_t *bptr = NULL;
int len = avpkt->size;
int ret = 0;
int i;
|
752e6dfa |
av_fast_padded_malloc(&ctx->pktbuf, &ctx->pktbuf_size, len);
if (!ctx->pktbuf) {
av_log(ctx, AV_LOG_WARNING, "Insufficient Memory of %d truncated to %d\n", len, ctx->pktbuf_size);
return AVERROR(ENOMEM); |
4b626261 |
} |
752e6dfa |
memcpy(ctx->pktbuf, avpkt->data, len);
bptr = ctx->pktbuf; |
4b626261 |
for (i = 0; i < len; i += 3) {
uint8_t cc_type = *(bptr + i) & 3; |
55ca79f5 |
if (validate_cc_data_pair(bptr + i)) |
4b626261 |
continue;
/* ignoring data field 1 */
if(cc_type == 1)
continue;
else |
d8620158 |
process_cc608(ctx, start_time, *(bptr + i + 1) & 0x7f, *(bptr + i + 2) & 0x7f); |
5c041e2c |
if (!ctx->buffer_changed)
continue;
ctx->buffer_changed = 0;
if (*ctx->buffer.str || ctx->real_time) |
4b626261 |
{ |
229843aa |
ff_dlog(ctx, "cdp writing data (%s)\n",ctx->buffer.str); |
29412821 |
ret = ff_ass_add_rect(sub, ctx->buffer.str, ctx->readorder++, 0, NULL, NULL); |
4b626261 |
if (ret < 0)
return ret; |
d8620158 |
sub->pts = ctx->start_time; |
29412821 |
if (!ctx->real_time)
sub->end_display_time = av_rescale_q(ctx->end_time - ctx->start_time, |
d8620158 |
AV_TIME_BASE_Q, ms_tb); |
29412821 |
else
sub->end_display_time = -1; |
c75b8695 |
ctx->buffer_changed = 0; |
d8620158 |
ctx->last_real_time = sub->pts; |
5c041e2c |
ctx->screen_touched = 0; |
4b626261 |
}
}
|
5c041e2c |
if (ctx->real_time && ctx->screen_touched && |
d8620158 |
sub->pts > ctx->last_real_time + av_rescale_q(200, ms_tb, AV_TIME_BASE_Q)) {
ctx->last_real_time = sub->pts; |
5c041e2c |
ctx->screen_touched = 0;
capture_screen(ctx);
ctx->buffer_changed = 0;
|
29412821 |
ret = ff_ass_add_rect(sub, ctx->buffer.str, ctx->readorder++, 0, NULL, NULL); |
5c041e2c |
if (ret < 0)
return ret; |
29412821 |
sub->end_display_time = -1; |
5c041e2c |
}
|
4b626261 |
*got_sub = sub->num_rects > 0;
return ret;
} |
012559f2 |
|
5c041e2c |
#define OFFSET(x) offsetof(CCaptionSubContext, x)
#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM |
4b626261 |
static const AVOption options[] = { |
5c041e2c |
{ "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 }, |
4b626261 |
{NULL}
}; |
012559f2 |
|
4b626261 |
static const AVClass ccaption_dec_class = {
.class_name = "Closed caption Decoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_ccaption_decoder = {
.name = "cc_dec", |
b4a13d44 |
.long_name = NULL_IF_CONFIG_SMALL("Closed Caption (EIA-608 / CEA-708)"), |
4b626261 |
.type = AVMEDIA_TYPE_SUBTITLE,
.id = AV_CODEC_ID_EIA_608,
.priv_data_size = sizeof(CCaptionSubContext),
.init = init_decoder,
.close = close_decoder, |
260e3687 |
.flush = flush_decoder, |
4b626261 |
.decode = decode,
.priv_class = &ccaption_dec_class,
}; |