mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-27 05:00:37 +00:00
836 lines
30 KiB
C
836 lines
30 KiB
C
/*
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* Teletext decoding for ffmpeg
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* Copyright (c) 2005-2010, 2012 Wolfram Gloger
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* Copyright (c) 2013 Marton Balint
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "libavcodec/ass.h"
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#include "libavcodec/dvbtxt.h"
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#include "libavutil/opt.h"
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#include "libavutil/bprint.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/log.h"
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#include "libavutil/common.h"
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#include <libzvbi.h>
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#define TEXT_MAXSZ (25 * (56 + 1) * 4 + 2)
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#define VBI_NB_COLORS 40
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#define VBI_TRANSPARENT_BLACK 8
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#define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
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#define VBI_R(rgba) (((rgba) >> 0) & 0xFF)
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#define VBI_G(rgba) (((rgba) >> 8) & 0xFF)
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#define VBI_B(rgba) (((rgba) >> 16) & 0xFF)
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#define VBI_A(rgba) (((rgba) >> 24) & 0xFF)
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#define MAX_BUFFERED_PAGES 25
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#define BITMAP_CHAR_WIDTH 12
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#define BITMAP_CHAR_HEIGHT 10
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#define MAX_SLICES 64
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typedef struct TeletextPage
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{
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AVSubtitleRect *sub_rect;
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int pgno;
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int subno;
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int64_t pts;
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} TeletextPage;
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typedef struct TeletextContext
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{
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AVClass *class;
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char *pgno;
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int default_region;
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int x_offset;
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int y_offset;
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int format_id; /* 0 = bitmap, 1 = text/ass, 2 = ass */
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int chop_top;
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int sub_duration; /* in msec */
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int transparent_bg;
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int opacity;
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int chop_spaces;
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int lines_processed;
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TeletextPage *pages;
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int nb_pages;
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int64_t pts;
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int handler_ret;
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vbi_decoder * vbi;
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vbi_sliced sliced[MAX_SLICES];
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int readorder;
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uint8_t subtitle_map[2048];
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int last_pgno;
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int last_p5;
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int last_ass_alignment;
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} TeletextContext;
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static int my_ass_subtitle_header(AVCodecContext *avctx)
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{
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int ret = ff_ass_subtitle_header_default(avctx);
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char *new_header;
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uint8_t *event_pos;
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if (ret < 0)
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return ret;
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event_pos = strstr(avctx->subtitle_header, "\r\n[Events]\r\n");
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if (!event_pos)
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return AVERROR_BUG;
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new_header = av_asprintf("%.*s%s%s",
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(int)(event_pos - avctx->subtitle_header), avctx->subtitle_header,
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"Style: "
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"Teletext," /* Name */
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"Monospace,11," /* Font{name,size} */
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"&Hffffff,&Hffffff,&H0,&H0," /* {Primary,Secondary,Outline,Back}Colour */
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"0,0,0,0," /* Bold, Italic, Underline, StrikeOut */
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"160,100," /* Scale{X,Y} */
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"0,0," /* Spacing, Angle */
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"3,0.1,0," /* BorderStyle, Outline, Shadow */
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"5,1,1,1," /* Alignment, Margin[LRV] */
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"0\r\n" /* Encoding */
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"Style: "
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"Subtitle," /* Name */
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"Monospace,16," /* Font{name,size} */
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"&Hffffff,&Hffffff,&H0,&H0," /* {Primary,Secondary,Outline,Back}Colour */
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"0,0,0,0," /* Bold, Italic, Underline, StrikeOut */
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"100,100," /* Scale{X,Y} */
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"0,0," /* Spacing, Angle */
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"1,1,1," /* BorderStyle, Outline, Shadow */
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"8,48,48,20," /* Alignment, Margin[LRV] */
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"0\r\n" /* Encoding */
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, event_pos);
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if (!new_header)
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return AVERROR(ENOMEM);
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av_free(avctx->subtitle_header);
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avctx->subtitle_header = new_header;
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avctx->subtitle_header_size = strlen(new_header);
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return 0;
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}
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static int chop_spaces_utf8(const unsigned char* t, int len)
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{
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t += len;
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while (len > 0) {
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if (*--t != ' ' || (len-1 > 0 && *(t-1) & 0x80))
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break;
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--len;
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}
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return len;
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}
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static void subtitle_rect_free(AVSubtitleRect **sub_rect)
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{
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av_freep(&(*sub_rect)->data[0]);
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av_freep(&(*sub_rect)->data[1]);
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av_freep(&(*sub_rect)->ass);
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av_freep(sub_rect);
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}
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static char *create_ass_text(TeletextContext *ctx, const char *text)
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{
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char *dialog;
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AVBPrint buf;
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av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
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ff_ass_bprint_text_event(&buf, text, strlen(text), "", 0);
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if (!av_bprint_is_complete(&buf)) {
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av_bprint_finalize(&buf, NULL);
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return NULL;
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}
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dialog = ff_ass_get_dialog(ctx->readorder++, 0, NULL, NULL, buf.str);
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av_bprint_finalize(&buf, NULL);
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return dialog;
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}
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/* Draw a page as text */
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static int gen_sub_text(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
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{
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const char *in;
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AVBPrint buf;
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char *vbi_text = av_malloc(TEXT_MAXSZ);
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int sz;
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if (!vbi_text)
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return AVERROR(ENOMEM);
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sz = vbi_print_page_region(page, vbi_text, TEXT_MAXSZ-1, "UTF-8",
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/*table mode*/ TRUE, FALSE,
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0, chop_top,
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page->columns, page->rows-chop_top);
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if (sz <= 0) {
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av_log(ctx, AV_LOG_ERROR, "vbi_print error\n");
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av_free(vbi_text);
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return AVERROR_EXTERNAL;
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}
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vbi_text[sz] = '\0';
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in = vbi_text;
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av_bprint_init(&buf, 0, TEXT_MAXSZ);
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if (ctx->chop_spaces) {
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for (;;) {
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int nl, sz;
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// skip leading spaces and newlines
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in += strspn(in, " \n");
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// compute end of row
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for (nl = 0; in[nl]; ++nl)
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if (in[nl] == '\n' && (nl==0 || !(in[nl-1] & 0x80)))
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break;
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if (!in[nl])
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break;
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// skip trailing spaces
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sz = chop_spaces_utf8(in, nl);
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av_bprint_append_data(&buf, in, sz);
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av_bprintf(&buf, "\n");
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in += nl;
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}
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} else {
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av_bprintf(&buf, "%s\n", vbi_text);
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}
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av_free(vbi_text);
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if (!av_bprint_is_complete(&buf)) {
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av_bprint_finalize(&buf, NULL);
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return AVERROR(ENOMEM);
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}
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if (buf.len) {
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sub_rect->type = SUBTITLE_ASS;
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sub_rect->ass = create_ass_text(ctx, buf.str);
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if (!sub_rect->ass) {
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av_bprint_finalize(&buf, NULL);
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return AVERROR(ENOMEM);
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}
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av_log(ctx, AV_LOG_DEBUG, "subtext:%s:txetbus\n", sub_rect->ass);
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} else {
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sub_rect->type = SUBTITLE_NONE;
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}
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av_bprint_finalize(&buf, NULL);
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return 0;
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}
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static void bprint_color(const char *type, AVBPrint *buf, vbi_page *page, unsigned ci)
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{
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int r = VBI_R(page->color_map[ci]);
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int g = VBI_G(page->color_map[ci]);
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int b = VBI_B(page->color_map[ci]);
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av_bprintf(buf, "{\\%s&H%02X%02X%02X&}", type, b, g, r);
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}
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#define IS_TXT_SPACE(ch) ((ch).unicode < 0x0020 || (ch).unicode >= 0xe000 || (ch).unicode == 0x00a0 ||\
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(ch).size > VBI_DOUBLE_SIZE || (ch).opacity == VBI_TRANSPARENT_SPACE)
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static void get_trim_info(vbi_page *page, vbi_char *row, int *leading, int *trailing, int *olen)
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{
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int i, len = 0;
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int char_seen = 0;
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*leading = 0;
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for (i = 0; i < page->columns; i++) {
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uint16_t out = IS_TXT_SPACE(row[i]) ? 32 : row[i].unicode;
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if (out == 32 && !char_seen)
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(*leading)++;
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else if (out != 32)
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char_seen = 1, len = i - (*leading) + 1;
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}
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*olen = len;
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*trailing = len > 0 ? page->columns - *leading - len : page->columns;
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}
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static void decode_string(vbi_page *page, vbi_char *row, AVBPrint *buf,
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int start, int end, vbi_color *cur_color, vbi_color *cur_back_color)
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{
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int i;
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for (i = start; i < end; i++) {
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uint16_t out = IS_TXT_SPACE(row[i]) ? 32 : row[i].unicode;
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if (*cur_color != row[i].foreground) {
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bprint_color("c", buf, page, row[i].foreground);
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*cur_color = row[i].foreground;
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}
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if (*cur_back_color != row[i].background) {
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bprint_color("3c", buf, page, row[i].background);
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*cur_back_color = row[i].background;
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}
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if (out == 32) {
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av_bprintf(buf, "\\h");
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} else if (out == '\\' || out == '{' || out == '}') {
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av_bprintf(buf, "\\%c", (char)out);
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} else {
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char tmp;
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/* convert to utf-8 */
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PUT_UTF8(out, tmp, av_bprint_chars(buf, tmp, 1););
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}
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}
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}
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/* Draw a page as ass formatted text */
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static int gen_sub_ass(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
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{
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int i;
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int leading, trailing, len;
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int last_trailing = -1, last_leading = -1;
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int min_trailing = page->columns, min_leading = page->columns;
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int alignment = 2;
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int vertical_align = -1;
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int can_align_left = 1, can_align_right = 1, can_align_center = 1;
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int is_subtitle_page = ctx->subtitle_map[page->pgno & 0x7ff];
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int empty_lines = 0;
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vbi_color cur_color = VBI_WHITE;
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vbi_color cur_back_color = VBI_BLACK;
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AVBPrint buf;
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av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
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for (i = chop_top; i < page->rows; i++) {
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vbi_char *row = page->text + i * page->columns;
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get_trim_info(page, row, &leading, &trailing, &len);
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if (len) {
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if (last_leading != -1 && last_leading != leading || leading > 5)
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can_align_left = 0;
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if (last_trailing != -1 && last_trailing != trailing || trailing > 2)
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can_align_right = 0;
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if (last_trailing != -1 && (FFABS((trailing - leading) - (last_trailing - last_leading)) > 1) || trailing - leading > 4)
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can_align_center = 0;
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last_leading = leading;
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last_trailing = trailing;
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min_leading = FFMIN(leading, min_leading);
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min_trailing = FFMIN(trailing, min_trailing);
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}
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}
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if (!can_align_right && can_align_left && !can_align_center) {
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ctx->last_ass_alignment = alignment = 1;
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} else if (!can_align_right && !can_align_left && can_align_center) {
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ctx->last_ass_alignment = alignment = 2;
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} else if (can_align_right && !can_align_left && !can_align_center) {
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ctx->last_ass_alignment = alignment = 3;
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} else {
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if (ctx->last_ass_alignment == 1 && can_align_left ||
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ctx->last_ass_alignment == 2 && can_align_center ||
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ctx->last_ass_alignment == 3 && can_align_right)
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alignment = ctx->last_ass_alignment;
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}
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for (i = chop_top; i < page->rows; i++) {
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int j;
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vbi_char *row = page->text + i * page->columns;
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int is_transparent_line;
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for (j = 0; j < page->columns; j++)
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if (row[j].opacity != VBI_TRANSPARENT_SPACE)
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break;
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is_transparent_line = (j == page->columns);
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len = is_transparent_line ? 0 : page->columns;
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leading = trailing = is_transparent_line ? page->columns : 0;
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if (is_subtitle_page) {
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if (!is_transparent_line)
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get_trim_info(page, row, &leading, &trailing, &len);
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if (vertical_align == -1 && len) {
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vertical_align = (2 - (av_clip(i + 1, 0, 23) / 8));
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av_bprintf(&buf, "{\\an%d}", alignment + vertical_align * 3);
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if (vertical_align != 2)
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empty_lines = 0;
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}
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if (len && empty_lines > 1)
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for (empty_lines /= 2; empty_lines > 0; empty_lines--)
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av_bprintf(&buf, " \\N");
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if (alignment == 1 || alignment == 2 && !can_align_center)
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leading = min_leading;
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if (alignment == 3 || alignment == 2 && !can_align_center)
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trailing = min_trailing;
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}
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if (len || !is_subtitle_page) {
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decode_string(page, row, &buf, leading, page->columns - trailing, &cur_color, &cur_back_color);
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av_bprintf(&buf, " \\N");
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empty_lines = 0;
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} else {
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empty_lines++;
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}
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}
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if (vertical_align == 0)
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for (empty_lines = (empty_lines - 1) / 2; empty_lines > 0; empty_lines--)
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av_bprintf(&buf, " \\N");
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if (!av_bprint_is_complete(&buf)) {
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av_bprint_finalize(&buf, NULL);
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return AVERROR(ENOMEM);
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}
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if (buf.len) {
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sub_rect->type = SUBTITLE_ASS;
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sub_rect->ass = ff_ass_get_dialog(ctx->readorder++, 0, is_subtitle_page ? "Subtitle" : "Teletext", NULL, buf.str);
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if (!sub_rect->ass) {
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av_bprint_finalize(&buf, NULL);
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return AVERROR(ENOMEM);
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}
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av_log(ctx, AV_LOG_DEBUG, "subtext:%s:txetbus\n", sub_rect->ass);
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} else {
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sub_rect->type = SUBTITLE_NONE;
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}
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av_bprint_finalize(&buf, NULL);
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return 0;
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}
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static void fix_transparency(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page,
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int chop_top, int resx, int resy)
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{
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int iy;
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// Hack for transparency, inspired by VLC code...
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for (iy = 0; iy < resy; iy++) {
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uint8_t *pixel = sub_rect->data[0] + iy * sub_rect->linesize[0];
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vbi_char *vc = page->text + (iy / BITMAP_CHAR_HEIGHT + chop_top) * page->columns;
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vbi_char *vcnext = vc + page->columns;
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for (; vc < vcnext; vc++) {
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uint8_t *pixelnext = pixel + BITMAP_CHAR_WIDTH;
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switch (vc->opacity) {
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case VBI_TRANSPARENT_SPACE:
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memset(pixel, VBI_TRANSPARENT_BLACK, BITMAP_CHAR_WIDTH);
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break;
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case VBI_OPAQUE:
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if (!ctx->transparent_bg)
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break;
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case VBI_SEMI_TRANSPARENT:
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if (ctx->opacity > 0) {
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if (ctx->opacity < 255)
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for(; pixel < pixelnext; pixel++)
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if (*pixel == vc->background)
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*pixel += VBI_NB_COLORS;
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break;
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}
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case VBI_TRANSPARENT_FULL:
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for(; pixel < pixelnext; pixel++)
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if (*pixel == vc->background)
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*pixel = VBI_TRANSPARENT_BLACK;
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break;
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}
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pixel = pixelnext;
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}
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}
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}
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/* Draw a page as bitmap */
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static int gen_sub_bitmap(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
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{
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int resx = page->columns * BITMAP_CHAR_WIDTH;
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int resy = (page->rows - chop_top) * BITMAP_CHAR_HEIGHT;
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uint8_t ci;
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vbi_char *vc = page->text + (chop_top * page->columns);
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vbi_char *vcend = page->text + (page->rows * page->columns);
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for (; vc < vcend; vc++) {
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if (vc->opacity != VBI_TRANSPARENT_SPACE)
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break;
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}
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if (vc >= vcend) {
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av_log(ctx, AV_LOG_DEBUG, "dropping empty page %3x\n", page->pgno);
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sub_rect->type = SUBTITLE_NONE;
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return 0;
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}
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sub_rect->data[0] = av_mallocz(resx * resy);
|
|
sub_rect->linesize[0] = resx;
|
|
if (!sub_rect->data[0])
|
|
return AVERROR(ENOMEM);
|
|
|
|
vbi_draw_vt_page_region(page, VBI_PIXFMT_PAL8,
|
|
sub_rect->data[0], sub_rect->linesize[0],
|
|
0, chop_top, page->columns, page->rows - chop_top,
|
|
/*reveal*/ 1, /*flash*/ 1);
|
|
|
|
fix_transparency(ctx, sub_rect, page, chop_top, resx, resy);
|
|
sub_rect->x = ctx->x_offset;
|
|
sub_rect->y = ctx->y_offset + chop_top * BITMAP_CHAR_HEIGHT;
|
|
sub_rect->w = resx;
|
|
sub_rect->h = resy;
|
|
sub_rect->nb_colors = ctx->opacity > 0 && ctx->opacity < 255 ? 2 * VBI_NB_COLORS : VBI_NB_COLORS;
|
|
sub_rect->data[1] = av_mallocz(AVPALETTE_SIZE);
|
|
if (!sub_rect->data[1]) {
|
|
av_freep(&sub_rect->data[0]);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
for (ci = 0; ci < VBI_NB_COLORS; ci++) {
|
|
int r, g, b, a;
|
|
|
|
r = VBI_R(page->color_map[ci]);
|
|
g = VBI_G(page->color_map[ci]);
|
|
b = VBI_B(page->color_map[ci]);
|
|
a = VBI_A(page->color_map[ci]);
|
|
((uint32_t *)sub_rect->data[1])[ci] = RGBA(r, g, b, a);
|
|
((uint32_t *)sub_rect->data[1])[ci + VBI_NB_COLORS] = RGBA(r, g, b, ctx->opacity);
|
|
ff_dlog(ctx, "palette %0x\n", ((uint32_t *)sub_rect->data[1])[ci]);
|
|
}
|
|
((uint32_t *)sub_rect->data[1])[VBI_TRANSPARENT_BLACK] = RGBA(0, 0, 0, 0);
|
|
((uint32_t *)sub_rect->data[1])[VBI_TRANSPARENT_BLACK + VBI_NB_COLORS] = RGBA(0, 0, 0, 0);
|
|
sub_rect->type = SUBTITLE_BITMAP;
|
|
return 0;
|
|
}
|
|
|
|
static void handler(vbi_event *ev, void *user_data)
|
|
{
|
|
TeletextContext *ctx = user_data;
|
|
TeletextPage *new_pages;
|
|
vbi_page page;
|
|
int res;
|
|
char pgno_str[12];
|
|
int chop_top;
|
|
int is_subtitle_page = ctx->subtitle_map[ev->ev.ttx_page.pgno & 0x7ff];
|
|
|
|
snprintf(pgno_str, sizeof pgno_str, "%03x", ev->ev.ttx_page.pgno);
|
|
av_log(ctx, AV_LOG_DEBUG, "decoded page %s.%02x\n",
|
|
pgno_str, ev->ev.ttx_page.subno & 0xFF);
|
|
|
|
if (strcmp(ctx->pgno, "*") && (strcmp(ctx->pgno, "subtitle") || !is_subtitle_page) && !strstr(ctx->pgno, pgno_str))
|
|
return;
|
|
if (ctx->handler_ret < 0)
|
|
return;
|
|
|
|
res = vbi_fetch_vt_page(ctx->vbi, &page,
|
|
ev->ev.ttx_page.pgno,
|
|
ev->ev.ttx_page.subno,
|
|
VBI_WST_LEVEL_3p5, 25, TRUE);
|
|
|
|
if (!res)
|
|
return;
|
|
|
|
chop_top = ctx->chop_top || ((page.rows > 1) && is_subtitle_page);
|
|
|
|
av_log(ctx, AV_LOG_DEBUG, "%d x %d page chop:%d\n",
|
|
page.columns, page.rows, chop_top);
|
|
|
|
if (ctx->nb_pages < MAX_BUFFERED_PAGES) {
|
|
if ((new_pages = av_realloc_array(ctx->pages, ctx->nb_pages + 1, sizeof(TeletextPage)))) {
|
|
TeletextPage *cur_page = new_pages + ctx->nb_pages;
|
|
ctx->pages = new_pages;
|
|
cur_page->sub_rect = av_mallocz(sizeof(*cur_page->sub_rect));
|
|
cur_page->pts = ctx->pts;
|
|
cur_page->pgno = ev->ev.ttx_page.pgno;
|
|
cur_page->subno = ev->ev.ttx_page.subno;
|
|
if (cur_page->sub_rect) {
|
|
switch (ctx->format_id) {
|
|
case 0:
|
|
res = gen_sub_bitmap(ctx, cur_page->sub_rect, &page, chop_top);
|
|
break;
|
|
case 1:
|
|
res = gen_sub_text(ctx, cur_page->sub_rect, &page, chop_top);
|
|
break;
|
|
case 2:
|
|
res = gen_sub_ass(ctx, cur_page->sub_rect, &page, chop_top);
|
|
break;
|
|
default:
|
|
res = AVERROR_BUG;
|
|
break;
|
|
}
|
|
if (res < 0) {
|
|
av_freep(&cur_page->sub_rect);
|
|
ctx->handler_ret = res;
|
|
} else {
|
|
ctx->pages[ctx->nb_pages++] = *cur_page;
|
|
}
|
|
} else {
|
|
ctx->handler_ret = AVERROR(ENOMEM);
|
|
}
|
|
} else {
|
|
ctx->handler_ret = AVERROR(ENOMEM);
|
|
}
|
|
} else {
|
|
//TODO: If multiple packets contain more than one page, pages may got queued up, and this may happen...
|
|
av_log(ctx, AV_LOG_ERROR, "Buffered too many pages, dropping page %s.\n", pgno_str);
|
|
ctx->handler_ret = AVERROR(ENOSYS);
|
|
}
|
|
|
|
vbi_unref_page(&page);
|
|
}
|
|
|
|
static int slice_to_vbi_lines(TeletextContext *ctx, uint8_t* buf, int size)
|
|
{
|
|
int lines = 0;
|
|
while (size >= 2 && lines < MAX_SLICES) {
|
|
int data_unit_id = buf[0];
|
|
int data_unit_length = buf[1];
|
|
if (data_unit_length + 2 > size)
|
|
return AVERROR_INVALIDDATA;
|
|
if (ff_data_unit_id_is_teletext(data_unit_id)) {
|
|
if (data_unit_length != 0x2c)
|
|
return AVERROR_INVALIDDATA;
|
|
else {
|
|
int line_offset = buf[2] & 0x1f;
|
|
int field_parity = buf[2] & 0x20;
|
|
uint8_t *p = ctx->sliced[lines].data;
|
|
int i, pmag;
|
|
ctx->sliced[lines].id = VBI_SLICED_TELETEXT_B;
|
|
ctx->sliced[lines].line = (line_offset > 0 ? (line_offset + (field_parity ? 0 : 313)) : 0);
|
|
for (i = 0; i < 42; i++)
|
|
p[i] = vbi_rev8(buf[4 + i]);
|
|
/* Unfortunately libzvbi does not expose page flags, and
|
|
* vbi_classify_page only checks MIP, so we have to manually
|
|
* decode the page flags and store the results. */
|
|
pmag = vbi_unham16p(p);
|
|
if (pmag >= 0 && pmag >> 3 == 0) { // We found a row 0 header
|
|
int page = vbi_unham16p(p + 2);
|
|
int flags1 = vbi_unham16p(p + 6);
|
|
int flags2 = vbi_unham16p(p + 8);
|
|
if (page >= 0 && flags1 >= 0 && flags2 >= 0) {
|
|
int pgno = ((pmag & 7) << 8) + page;
|
|
// Check for disabled NEWSFLASH flag and enabled SUBTITLE and SUPRESS_HEADER flags
|
|
ctx->subtitle_map[pgno] = (!(flags1 & 0x40) && flags1 & 0x80 && flags2 & 0x01);
|
|
// Propagate ERASE_PAGE flag for repeated page headers to work around a libzvbi bug
|
|
if (ctx->subtitle_map[pgno] && pgno == ctx->last_pgno) {
|
|
int last_byte9 = vbi_unham8(ctx->last_p5);
|
|
if (last_byte9 >= 0 && last_byte9 & 0x8) {
|
|
int byte9 = vbi_unham8(p[5]);
|
|
if (byte9 >= 0)
|
|
p[5] = vbi_ham8(byte9 | 0x8);
|
|
}
|
|
}
|
|
ctx->last_pgno = pgno;
|
|
ctx->last_p5 = p[5];
|
|
}
|
|
}
|
|
lines++;
|
|
}
|
|
}
|
|
size -= data_unit_length + 2;
|
|
buf += data_unit_length + 2;
|
|
}
|
|
if (size)
|
|
av_log(ctx, AV_LOG_WARNING, "%d bytes remained after slicing data\n", size);
|
|
return lines;
|
|
}
|
|
|
|
static int teletext_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *pkt)
|
|
{
|
|
TeletextContext *ctx = avctx->priv_data;
|
|
AVSubtitle *sub = data;
|
|
int ret = 0;
|
|
int j;
|
|
|
|
if (!ctx->vbi) {
|
|
if (!(ctx->vbi = vbi_decoder_new()))
|
|
return AVERROR(ENOMEM);
|
|
if (ctx->default_region != -1) {
|
|
av_log(avctx, AV_LOG_INFO, "Setting default zvbi region to %i\n", ctx->default_region);
|
|
vbi_teletext_set_default_region(ctx->vbi, ctx->default_region);
|
|
}
|
|
if (!vbi_event_handler_register(ctx->vbi, VBI_EVENT_TTX_PAGE, handler, ctx)) {
|
|
vbi_decoder_delete(ctx->vbi);
|
|
ctx->vbi = NULL;
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
}
|
|
|
|
if (avctx->pkt_timebase.num && pkt->pts != AV_NOPTS_VALUE)
|
|
ctx->pts = av_rescale_q(pkt->pts, avctx->pkt_timebase, AV_TIME_BASE_Q);
|
|
|
|
if (pkt->size) {
|
|
int lines;
|
|
const int full_pes_size = pkt->size + 45; /* PES header is 45 bytes */
|
|
|
|
// We allow unreasonably big packets, even if the standard only allows a max size of 1472
|
|
if (full_pes_size < 184 || full_pes_size > 65504 || full_pes_size % 184 != 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
ctx->handler_ret = pkt->size;
|
|
|
|
if (ff_data_identifier_is_teletext(*pkt->data)) {
|
|
if ((lines = slice_to_vbi_lines(ctx, pkt->data + 1, pkt->size - 1)) < 0)
|
|
return lines;
|
|
ff_dlog(avctx, "ctx=%p buf_size=%d lines=%u pkt_pts=%7.3f\n",
|
|
ctx, pkt->size, lines, (double)pkt->pts/90000.0);
|
|
if (lines > 0) {
|
|
vbi_decode(ctx->vbi, ctx->sliced, lines, 0.0);
|
|
ctx->lines_processed += lines;
|
|
}
|
|
}
|
|
ctx->pts = AV_NOPTS_VALUE;
|
|
ret = ctx->handler_ret;
|
|
}
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
// is there a subtitle to pass?
|
|
if (ctx->nb_pages) {
|
|
int i;
|
|
sub->format = !!ctx->format_id;
|
|
sub->start_display_time = 0;
|
|
sub->end_display_time = ctx->sub_duration;
|
|
sub->num_rects = 0;
|
|
sub->pts = ctx->pages->pts;
|
|
|
|
if (ctx->pages->sub_rect->type != SUBTITLE_NONE) {
|
|
sub->rects = av_malloc(sizeof(*sub->rects));
|
|
if (sub->rects) {
|
|
sub->num_rects = 1;
|
|
sub->rects[0] = ctx->pages->sub_rect;
|
|
#if FF_API_AVPICTURE
|
|
FF_DISABLE_DEPRECATION_WARNINGS
|
|
for (j = 0; j < 4; j++) {
|
|
sub->rects[0]->pict.data[j] = sub->rects[0]->data[j];
|
|
sub->rects[0]->pict.linesize[j] = sub->rects[0]->linesize[j];
|
|
}
|
|
FF_ENABLE_DEPRECATION_WARNINGS
|
|
#endif
|
|
} else {
|
|
ret = AVERROR(ENOMEM);
|
|
}
|
|
} else {
|
|
av_log(avctx, AV_LOG_DEBUG, "sending empty sub\n");
|
|
sub->rects = NULL;
|
|
}
|
|
if (!sub->rects) // no rect was passed
|
|
subtitle_rect_free(&ctx->pages->sub_rect);
|
|
|
|
for (i = 0; i < ctx->nb_pages - 1; i++)
|
|
ctx->pages[i] = ctx->pages[i + 1];
|
|
ctx->nb_pages--;
|
|
|
|
if (ret >= 0)
|
|
*got_sub_ptr = 1;
|
|
} else
|
|
*got_sub_ptr = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int teletext_init_decoder(AVCodecContext *avctx)
|
|
{
|
|
TeletextContext *ctx = avctx->priv_data;
|
|
unsigned int maj, min, rev;
|
|
|
|
vbi_version(&maj, &min, &rev);
|
|
if (!(maj > 0 || min > 2 || min == 2 && rev >= 26)) {
|
|
av_log(avctx, AV_LOG_ERROR, "decoder needs zvbi version >= 0.2.26.\n");
|
|
return AVERROR_EXTERNAL;
|
|
}
|
|
|
|
if (ctx->format_id == 0) {
|
|
avctx->width = 41 * BITMAP_CHAR_WIDTH;
|
|
avctx->height = 25 * BITMAP_CHAR_HEIGHT;
|
|
}
|
|
|
|
ctx->vbi = NULL;
|
|
ctx->pts = AV_NOPTS_VALUE;
|
|
ctx->last_pgno = -1;
|
|
ctx->last_ass_alignment = 2;
|
|
|
|
if (ctx->opacity == -1)
|
|
ctx->opacity = ctx->transparent_bg ? 0 : 255;
|
|
|
|
av_log(avctx, AV_LOG_VERBOSE, "page filter: %s\n", ctx->pgno);
|
|
|
|
switch (ctx->format_id) {
|
|
case 0:
|
|
return 0;
|
|
case 1:
|
|
return ff_ass_subtitle_header_default(avctx);
|
|
case 2:
|
|
return my_ass_subtitle_header(avctx);
|
|
}
|
|
return AVERROR_BUG;
|
|
}
|
|
|
|
static int teletext_close_decoder(AVCodecContext *avctx)
|
|
{
|
|
TeletextContext *ctx = avctx->priv_data;
|
|
|
|
ff_dlog(avctx, "lines_total=%u\n", ctx->lines_processed);
|
|
while (ctx->nb_pages)
|
|
subtitle_rect_free(&ctx->pages[--ctx->nb_pages].sub_rect);
|
|
av_freep(&ctx->pages);
|
|
|
|
vbi_decoder_delete(ctx->vbi);
|
|
ctx->vbi = NULL;
|
|
ctx->pts = AV_NOPTS_VALUE;
|
|
ctx->last_pgno = -1;
|
|
ctx->last_ass_alignment = 2;
|
|
memset(ctx->subtitle_map, 0, sizeof(ctx->subtitle_map));
|
|
if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
|
|
ctx->readorder = 0;
|
|
return 0;
|
|
}
|
|
|
|
static void teletext_flush(AVCodecContext *avctx)
|
|
{
|
|
teletext_close_decoder(avctx);
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(TeletextContext, x)
|
|
#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
|
|
static const AVOption options[] = {
|
|
{"txt_page", "page numbers to decode, subtitle for subtitles, * for all", OFFSET(pgno), AV_OPT_TYPE_STRING, {.str = "*"}, 0, 0, SD},
|
|
{"txt_default_region", "default G0 character set used for decoding", OFFSET(default_region), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 87, SD},
|
|
{"txt_chop_top", "discards the top teletext line", OFFSET(chop_top), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
|
|
{"txt_format", "format of the subtitles (bitmap or text or ass)", OFFSET(format_id), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 2, SD, "txt_format"},
|
|
{"bitmap", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, SD, "txt_format"},
|
|
{"text", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, SD, "txt_format"},
|
|
{"ass", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 0, SD, "txt_format"},
|
|
{"txt_left", "x offset of generated bitmaps", OFFSET(x_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
|
|
{"txt_top", "y offset of generated bitmaps", OFFSET(y_offset), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 65535, SD},
|
|
{"txt_chop_spaces", "chops leading and trailing spaces from text", OFFSET(chop_spaces), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
|
|
{"txt_duration", "display duration of teletext pages in msecs", OFFSET(sub_duration), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 86400000, SD},
|
|
{"txt_transparent", "force transparent background of the teletext", OFFSET(transparent_bg), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD},
|
|
{"txt_opacity", "set opacity of the transparent background", OFFSET(opacity), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 255, SD},
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass teletext_class = {
|
|
.class_name = "libzvbi_teletextdec",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
AVCodec ff_libzvbi_teletext_decoder = {
|
|
.name = "libzvbi_teletextdec",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Libzvbi DVB teletext decoder"),
|
|
.type = AVMEDIA_TYPE_SUBTITLE,
|
|
.id = AV_CODEC_ID_DVB_TELETEXT,
|
|
.priv_data_size = sizeof(TeletextContext),
|
|
.init = teletext_init_decoder,
|
|
.close = teletext_close_decoder,
|
|
.decode = teletext_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DELAY,
|
|
.flush = teletext_flush,
|
|
.priv_class= &teletext_class,
|
|
.wrapper_name = "libzvbi",
|
|
};
|