| /* |
| * 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/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)) ) |
| |
| /* |
| * TODO list |
| * 1) handle font and color completely |
| */ |
| enum cc_mode { |
| CCMODE_POPON, |
| CCMODE_PAINTON, |
| CCMODE_ROLLUP_2, |
| CCMODE_ROLLUP_3, |
| CCMODE_ROLLUP_4, |
| 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, |
| }; |
| |
| 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 */ |
| }; |
| |
| /* 0-255 needs 256 spaces */ |
| static const uint8_t parity_table[256] = { 0, 1, 1, 0, 1, 0, 0, 1, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 1, 0, 0, 1, 0, 1, 1, 0, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 0, 1, 1, 0, 1, 0, 0, 1, |
| 1, 0, 0, 1, 0, 1, 1, 0 }; |
| |
| struct Screen { |
| /* +1 is used to compensate null character of string */ |
| uint8_t characters[SCREEN_ROWS][SCREEN_COLUMNS+1]; |
| uint8_t colors[SCREEN_ROWS][SCREEN_COLUMNS+1]; |
| uint8_t fonts[SCREEN_ROWS][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; |
| struct Screen screen[2]; |
| int active_screen; |
| uint8_t cursor_row; |
| uint8_t cursor_column; |
| uint8_t cursor_color; |
| uint8_t cursor_font; |
| AVBPrint buffer; |
| int screen_changed; |
| int rollup; |
| enum cc_mode mode; |
| int64_t start_time; |
| /* visible screen time */ |
| int64_t startv_time; |
| int64_t end_time; |
| char prev_cmd[2]; |
| /* buffer to store pkt data */ |
| AVBufferRef *pktbuf; |
| }CCaptionSubContext; |
| |
| |
| 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 */ |
| ctx->mode = CCMODE_ROLLUP_2; |
| ctx->rollup = 2; |
| ret = ff_ass_subtitle_header_default(avctx); |
| if(ret < 0) { |
| return ret; |
| } |
| /* allocate pkt buffer */ |
| ctx->pktbuf = av_buffer_alloc(128); |
| if( !ctx->pktbuf) { |
| ret = AVERROR(ENOMEM); |
| } |
| return ret; |
| } |
| |
| static av_cold int close_decoder(AVCodecContext *avctx) |
| { |
| CCaptionSubContext *ctx = avctx->priv_data; |
| av_bprint_finalize( &ctx->buffer, NULL); |
| av_buffer_unref(&ctx->pktbuf); |
| return 0; |
| } |
| |
| /** |
| * @param ctx closed caption context just to print log |
| */ |
| static int write_char (CCaptionSubContext *ctx, char *row,uint8_t col, char ch) |
| { |
| if(col < SCREEN_COLUMNS) { |
| row[col] = ch; |
| return 0; |
| } |
| /* We have extra space at end only for null character */ |
| else if ( col == SCREEN_COLUMNS && ch == 0) { |
| row[col] = ch; |
| return 0; |
| } |
| else { |
| av_log(ctx, AV_LOG_WARNING,"Data Ignored since exceeding screen width\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| |
| /** |
| * 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 (uint8_t *cc_data_pair) |
| { |
| 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) { |
| if (!parity_table[cc_data_pair[2]]) { |
| return AVERROR_INVALIDDATA; |
| } |
| if (!parity_table[cc_data_pair[1]]) { |
| cc_data_pair[1]=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; |
| |
| /* 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: |
| case CCMODE_ROLLUP_2: |
| case CCMODE_ROLLUP_3: |
| case CCMODE_ROLLUP_4: |
| 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 < ctx->cursor_row - keep_lines; i++ ) |
| 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->fonts[i_row], screen->fonts[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 reap_screen(CCaptionSubContext *ctx, int64_t pts) |
| { |
| int i; |
| int ret = 0; |
| struct Screen *screen = ctx->screen + ctx->active_screen; |
| ctx->start_time = ctx->startv_time; |
| |
| for( i = 0; screen->row_used && i < SCREEN_ROWS; i++) |
| { |
| if(CHECK_FLAG(screen->row_used,i)) { |
| char *str = screen->characters[i]; |
| /* skip space */ |
| while (*str == ' ') |
| str++; |
| |
| av_bprintf(&ctx->buffer, "%s\\N", str); |
| ret = av_bprint_is_complete(&ctx->buffer); |
| if( ret == 0) { |
| ret = AVERROR(ENOMEM); |
| break; |
| } |
| } |
| |
| } |
| if(screen->row_used && ctx->buffer.len >= 2 ) { |
| ctx->buffer.len -= 2; |
| ctx->buffer.str[ctx->buffer.len] = 0; |
| } |
| ctx->startv_time = pts; |
| ctx->end_time = pts; |
| return ret; |
| } |
| |
| static void handle_textattr( CCaptionSubContext *ctx, uint8_t hi, uint8_t lo ) |
| { |
| int i = lo - 0x20; |
| int ret; |
| struct Screen *screen = get_writing_screen(ctx); |
| char *row = screen->characters[ctx->cursor_row]; |
| |
| 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); |
| ret = write_char(ctx, row, ctx->cursor_column, ' '); |
| if(ret == 0) |
| ctx->cursor_column++; |
| } |
| |
| 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); |
| char *row; |
| int indent,i,ret; |
| |
| 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_column = 0; |
| indent = pac2_attribs[lo][2]; |
| row = screen->characters[ctx->cursor_row]; |
| for(i = 0;i < indent; i++) { |
| ret = write_char(ctx, row, ctx->cursor_column, ' '); |
| if( ret == 0 ) |
| ctx->cursor_column++; |
| } |
| |
| } |
| |
| /** |
| * @param pts it is required to set end time |
| */ |
| static int handle_edm(CCaptionSubContext *ctx,int64_t pts) |
| { |
| int ret = 0; |
| struct Screen *screen = ctx->screen + ctx->active_screen; |
| |
| reap_screen(ctx, pts); |
| screen->row_used = 0; |
| ctx->screen_changed = 1; |
| return ret; |
| } |
| |
| static int handle_eoc(CCaptionSubContext *ctx, int64_t pts) |
| { |
| int ret; |
| ret = handle_edm(ctx,pts); |
| ctx->active_screen = !ctx->active_screen; |
| ctx->cursor_column = 0; |
| return ret; |
| } |
| |
| static void handle_delete_end_of_row( CCaptionSubContext *ctx, char hi, char lo) |
| { |
| struct Screen *screen = get_writing_screen(ctx); |
| char *row = screen->characters[ctx->cursor_row]; |
| write_char(ctx, row, ctx->cursor_column, 0); |
| |
| } |
| |
| static void handle_char(CCaptionSubContext *ctx, char hi, char lo, int64_t pts) |
| { |
| struct Screen *screen = get_writing_screen(ctx); |
| char *row = screen->characters[ctx->cursor_row]; |
| int ret; |
| |
| SET_FLAG(screen->row_used,ctx->cursor_row); |
| |
| ret = write_char(ctx, row, ctx->cursor_column, hi); |
| if( ret == 0 ) |
| ctx->cursor_column++; |
| |
| if(lo) { |
| ret = write_char(ctx, row, ctx->cursor_column, lo); |
| if ( ret == 0 ) |
| ctx->cursor_column++; |
| } |
| write_char(ctx, row, ctx->cursor_column, 0); |
| |
| /* reset prev command since character can repeat */ |
| ctx->prev_cmd[0] = 0; |
| ctx->prev_cmd[1] = 0; |
| if (lo) |
| ff_dlog(ctx, "(%c,%c)\n",hi,lo); |
| else |
| ff_dlog(ctx, "(%c)\n",hi); |
| } |
| |
| static int process_cc608(CCaptionSubContext *ctx, int64_t pts, uint8_t hi, uint8_t lo) |
| { |
| int ret = 0; |
| #define COR3(var, with1, with2, with3) ( (var) == (with1) || (var) == (with2) || (var) == (with3) ) |
| if ( hi == ctx->prev_cmd[0] && lo == ctx->prev_cmd[1]) { |
| /* ignore redundant command */ |
| } else 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 ( COR3(hi, 0x14, 0x15, 0x1C) && lo == 0x20 ) { |
| /* resume caption loading */ |
| ctx->mode = CCMODE_POPON; |
| } else if ( COR3(hi, 0x14, 0x15, 0x1C) && lo == 0x24 ) { |
| handle_delete_end_of_row(ctx, hi, lo); |
| } else if ( COR3(hi, 0x14, 0x15, 0x1C) && lo == 0x25 ) { |
| ctx->rollup = 2; |
| ctx->mode = CCMODE_ROLLUP_2; |
| } else if ( COR3(hi, 0x14, 0x15, 0x1C) && lo == 0x26 ) { |
| ctx->rollup = 3; |
| ctx->mode = CCMODE_ROLLUP_3; |
| } else if ( COR3(hi, 0x14, 0x15, 0x1C) && lo == 0x27 ) { |
| ctx->rollup = 4; |
| ctx->mode = CCMODE_ROLLUP_4; |
| } else if ( COR3(hi, 0x14, 0x15, 0x1C) && lo == 0x29 ) { |
| /* resume direct captioning */ |
| ctx->mode = CCMODE_PAINTON; |
| } else if ( COR3(hi, 0x14, 0x15, 0x1C) && lo == 0x2B ) { |
| /* resume text display */ |
| ctx->mode = CCMODE_TEXT; |
| } else if ( COR3(hi, 0x14, 0x15, 0x1C) && lo == 0x2C ) { |
| /* erase display memory */ |
| ret = handle_edm(ctx, pts); |
| } else if ( COR3(hi, 0x14, 0x15, 0x1C) && lo == 0x2D ) { |
| /* carriage return */ |
| ff_dlog(ctx, "carriage return\n"); |
| reap_screen(ctx, pts); |
| roll_up(ctx); |
| ctx->screen_changed = 1; |
| ctx->cursor_column = 0; |
| } else if ( COR3(hi, 0x14, 0x15, 0x1C) && lo == 0x2F ) { |
| /* end of caption */ |
| ff_dlog(ctx, "handle_eoc\n"); |
| ret = handle_eoc(ctx, pts); |
| } else if (hi>=0x20) { |
| /* Standard characters (always in pairs) */ |
| handle_char(ctx, hi, lo, pts); |
| } else { |
| /* Ignoring all other non data code */ |
| ff_dlog(ctx, "Unknown command 0x%hhx 0x%hhx\n", hi, lo); |
| } |
| |
| /* set prev command */ |
| ctx->prev_cmd[0] = hi; |
| ctx->prev_cmd[1] = lo; |
| |
| #undef COR3 |
| return ret; |
| |
| } |
| |
| static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt) |
| { |
| CCaptionSubContext *ctx = avctx->priv_data; |
| AVSubtitle *sub = data; |
| uint8_t *bptr = NULL; |
| int len = avpkt->size; |
| int ret = 0; |
| int i; |
| |
| if ( ctx->pktbuf->size < len) { |
| ret = av_buffer_realloc(&ctx->pktbuf, len); |
| if(ret < 0) { |
| av_log(ctx, AV_LOG_WARNING, "Insufficient Memory of %d truncated to %d\n",len, ctx->pktbuf->size); |
| len = ctx->pktbuf->size; |
| ret = 0; |
| } |
| } |
| memcpy(ctx->pktbuf->data, avpkt->data, len); |
| bptr = ctx->pktbuf->data; |
| |
| |
| for (i = 0; i < len; i += 3) { |
| uint8_t cc_type = *(bptr + i) & 3; |
| if (validate_cc_data_pair( bptr + i) ) |
| continue; |
| /* ignoring data field 1 */ |
| if(cc_type == 1) |
| continue; |
| else |
| process_cc608(ctx, avpkt->pts, *(bptr + i + 1) & 0x7f, *(bptr + i + 2) & 0x7f); |
| if(ctx->screen_changed && *ctx->buffer.str) |
| { |
| int start_time = av_rescale_q(ctx->start_time, avctx->time_base, (AVRational){ 1, 100 }); |
| int end_time = av_rescale_q(ctx->end_time, avctx->time_base, (AVRational){ 1, 100 }); |
| ff_dlog(ctx, "cdp writing data (%s)\n",ctx->buffer.str); |
| ret = ff_ass_add_rect_bprint(sub, &ctx->buffer, start_time, end_time - start_time); |
| if (ret < 0) |
| return ret; |
| sub->pts = av_rescale_q(ctx->start_time, avctx->time_base, AV_TIME_BASE_Q); |
| ctx->screen_changed = 0; |
| av_bprint_clear(&ctx->buffer); |
| } |
| } |
| |
| *got_sub = sub->num_rects > 0; |
| return ret; |
| } |
| |
| static const AVOption options[] = { |
| {NULL} |
| }; |
| |
| 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", |
| .long_name = NULL_IF_CONFIG_SMALL("Closed Caption (EIA-608 / CEA-708) Decoder"), |
| .type = AVMEDIA_TYPE_SUBTITLE, |
| .id = AV_CODEC_ID_EIA_608, |
| .priv_data_size = sizeof(CCaptionSubContext), |
| .init = init_decoder, |
| .close = close_decoder, |
| .decode = decode, |
| .priv_class = &ccaption_dec_class, |
| }; |
