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https://github.com/FFmpeg/FFmpeg.git
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571 lines
19 KiB
C
571 lines
19 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 "libavutil/opt.h"
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#include "libavutil/bprint.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/log.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 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 x_offset;
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int y_offset;
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int format_id; /* 0 = bitmap, 1 = text/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 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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#ifdef DEBUG
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vbi_export * ex;
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#endif
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vbi_sliced sliced[MAX_SLICES];
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} TeletextContext;
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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)->pict.data[0]);
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av_freep(&(*sub_rect)->pict.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 int create_ass_text(TeletextContext *ctx, const char *text, char **ass)
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{
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int ret;
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AVBPrint buf, buf2;
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const int ts_start = av_rescale_q(ctx->pts, AV_TIME_BASE_Q, (AVRational){1, 100});
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const int ts_duration = av_rescale_q(ctx->sub_duration, (AVRational){1, 1000}, (AVRational){1, 100});
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/* First we escape the plain text into 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 AVERROR(ENOMEM);
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}
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/* Then we create the ass dialog line in buf2 from the escaped text in buf. */
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av_bprint_init(&buf2, 0, AV_BPRINT_SIZE_UNLIMITED);
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ff_ass_bprint_dialog(&buf2, buf.str, ts_start, ts_duration, 0);
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av_bprint_finalize(&buf, NULL);
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if (!av_bprint_is_complete(&buf2)) {
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av_bprint_finalize(&buf2, NULL);
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return AVERROR(ENOMEM);
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}
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if ((ret = av_bprint_finalize(&buf2, ass)) < 0)
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return ret;
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return 0;
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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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int ret;
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sub_rect->type = SUBTITLE_ASS;
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if ((ret = create_ass_text(ctx, buf.str, &sub_rect->ass)) < 0) {
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av_bprint_finalize(&buf, NULL);
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return ret;
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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, uint8_t transparent_color, 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->pict.data[0] + iy * sub_rect->pict.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, transparent_color, BITMAP_CHAR_WIDTH);
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break;
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case VBI_OPAQUE:
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case VBI_SEMI_TRANSPARENT:
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if (!ctx->transparent_bg)
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break;
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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 = transparent_color;
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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, cmax = 0;
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int ret;
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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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cmax = VBI_NB_COLORS;
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break;
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}
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}
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if (cmax == 0) {
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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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if ((ret = avpicture_alloc(&sub_rect->pict, AV_PIX_FMT_PAL8, resx, resy)) < 0)
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return ret;
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// Yes, we want to allocate the palette on our own because AVSubtitle works this way
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sub_rect->pict.data[1] = NULL;
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vbi_draw_vt_page_region(page, VBI_PIXFMT_PAL8,
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sub_rect->pict.data[0], sub_rect->pict.linesize[0],
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0, chop_top, page->columns, page->rows - chop_top,
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/*reveal*/ 1, /*flash*/ 1);
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fix_transparency(ctx, sub_rect, page, chop_top, cmax, resx, resy);
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sub_rect->x = ctx->x_offset;
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sub_rect->y = ctx->y_offset + chop_top * BITMAP_CHAR_HEIGHT;
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sub_rect->w = resx;
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sub_rect->h = resy;
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sub_rect->nb_colors = (int)cmax + 1;
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sub_rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
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if (!sub_rect->pict.data[1]) {
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av_freep(&sub_rect->pict.data[0]);
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return AVERROR(ENOMEM);
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}
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for (ci = 0; ci < cmax; ci++) {
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int r, g, b, a;
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r = VBI_R(page->color_map[ci]);
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g = VBI_G(page->color_map[ci]);
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b = VBI_B(page->color_map[ci]);
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a = VBI_A(page->color_map[ci]);
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((uint32_t *)sub_rect->pict.data[1])[ci] = RGBA(r, g, b, a);
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av_dlog(ctx, "palette %0x\n", ((uint32_t *)sub_rect->pict.data[1])[ci]);
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}
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((uint32_t *)sub_rect->pict.data[1])[cmax] = RGBA(0, 0, 0, 0);
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sub_rect->type = SUBTITLE_BITMAP;
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return 0;
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}
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static void handler(vbi_event *ev, void *user_data)
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{
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TeletextContext *ctx = user_data;
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TeletextPage *new_pages;
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vbi_page page;
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int res;
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char pgno_str[12];
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vbi_subno subno;
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vbi_page_type vpt;
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int chop_top;
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char *lang;
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snprintf(pgno_str, sizeof pgno_str, "%03x", ev->ev.ttx_page.pgno);
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av_log(ctx, AV_LOG_DEBUG, "decoded page %s.%02x\n",
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pgno_str, ev->ev.ttx_page.subno & 0xFF);
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if (strcmp(ctx->pgno, "*") && !strstr(ctx->pgno, pgno_str))
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return;
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if (ctx->handler_ret < 0)
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return;
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res = vbi_fetch_vt_page(ctx->vbi, &page,
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ev->ev.ttx_page.pgno,
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ev->ev.ttx_page.subno,
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VBI_WST_LEVEL_3p5, 25, TRUE);
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if (!res)
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return;
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#ifdef DEBUG
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fprintf(stderr, "\nSaving res=%d dy0=%d dy1=%d...\n",
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res, page.dirty.y0, page.dirty.y1);
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fflush(stderr);
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if (!vbi_export_stdio(ctx->ex, stderr, &page))
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fprintf(stderr, "failed: %s\n", vbi_export_errstr(ctx->ex));
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#endif
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vpt = vbi_classify_page(ctx->vbi, ev->ev.ttx_page.pgno, &subno, &lang);
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chop_top = ctx->chop_top ||
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((page.rows > 1) && (vpt == VBI_SUBTITLE_PAGE));
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av_log(ctx, AV_LOG_DEBUG, "%d x %d page chop:%d\n",
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page.columns, page.rows, chop_top);
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if (ctx->nb_pages < MAX_BUFFERED_PAGES) {
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if ((new_pages = av_realloc_array(ctx->pages, ctx->nb_pages + 1, sizeof(TeletextPage)))) {
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TeletextPage *cur_page = new_pages + ctx->nb_pages;
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ctx->pages = new_pages;
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cur_page->sub_rect = av_mallocz(sizeof(*cur_page->sub_rect));
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cur_page->pts = ctx->pts;
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cur_page->pgno = ev->ev.ttx_page.pgno;
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cur_page->subno = ev->ev.ttx_page.subno;
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if (cur_page->sub_rect) {
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res = (ctx->format_id == 0) ?
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gen_sub_bitmap(ctx, cur_page->sub_rect, &page, chop_top) :
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gen_sub_text (ctx, cur_page->sub_rect, &page, chop_top);
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if (res < 0) {
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av_freep(&cur_page->sub_rect);
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ctx->handler_ret = res;
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} else {
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ctx->pages[ctx->nb_pages++] = *cur_page;
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}
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} else {
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ctx->handler_ret = AVERROR(ENOMEM);
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}
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} else {
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ctx->handler_ret = AVERROR(ENOMEM);
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}
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} else {
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//TODO: If multiple packets contain more than one page, pages may got queued up, and this may happen...
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av_log(ctx, AV_LOG_ERROR, "Buffered too many pages, dropping page %s.\n", pgno_str);
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ctx->handler_ret = AVERROR(ENOSYS);
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}
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vbi_unref_page(&page);
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}
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static inline int data_identifier_is_teletext(int data_identifier) {
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/* See EN 301 775 section 4.4.2. */
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return (data_identifier >= 0x10 && data_identifier <= 0x1F ||
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data_identifier >= 0x99 && data_identifier <= 0x9B);
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}
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static int slice_to_vbi_lines(TeletextContext *ctx, uint8_t* buf, int size)
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{
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int lines = 0;
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while (size >= 2 && lines < MAX_SLICES) {
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int data_unit_id = buf[0];
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int data_unit_length = buf[1];
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if (data_unit_length + 2 > size)
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return AVERROR_INVALIDDATA;
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if (data_unit_id == 0x02 || data_unit_id == 0x03) {
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if (data_unit_length != 0x2c)
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return AVERROR_INVALIDDATA;
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else {
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int line_offset = buf[2] & 0x1f;
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int field_parity = buf[2] & 0x20;
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int i;
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ctx->sliced[lines].id = VBI_SLICED_TELETEXT_B;
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ctx->sliced[lines].line = (line_offset > 0 ? (line_offset + (field_parity ? 0 : 313)) : 0);
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for (i = 0; i < 42; i++)
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ctx->sliced[lines].data[i] = vbi_rev8(buf[4 + i]);
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lines++;
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}
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}
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size -= data_unit_length + 2;
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buf += data_unit_length + 2;
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}
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if (size)
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av_log(ctx, AV_LOG_WARNING, "%d bytes remained after slicing data\n", size);
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return lines;
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}
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static int teletext_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *pkt)
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{
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TeletextContext *ctx = avctx->priv_data;
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AVSubtitle *sub = data;
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int ret = 0;
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if (!ctx->vbi) {
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if (!(ctx->vbi = vbi_decoder_new()))
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return AVERROR(ENOMEM);
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if (!vbi_event_handler_add(ctx->vbi, VBI_EVENT_TTX_PAGE, handler, ctx)) {
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vbi_decoder_delete(ctx->vbi);
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ctx->vbi = NULL;
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return AVERROR(ENOMEM);
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}
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}
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if (avctx->pkt_timebase.den && pkt->pts != AV_NOPTS_VALUE)
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ctx->pts = av_rescale_q(pkt->pts, avctx->pkt_timebase, AV_TIME_BASE_Q);
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if (pkt->size) {
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int lines;
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const int full_pes_size = pkt->size + 45; /* PES header is 45 bytes */
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// We allow unreasonably big packets, even if the standard only allows a max size of 1472
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if (full_pes_size < 184 || full_pes_size > 65504 || full_pes_size % 184 != 0)
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return AVERROR_INVALIDDATA;
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ctx->handler_ret = pkt->size;
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if (data_identifier_is_teletext(*pkt->data)) {
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if ((lines = slice_to_vbi_lines(ctx, pkt->data + 1, pkt->size - 1)) < 0)
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return lines;
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av_dlog(avctx, "ctx=%p buf_size=%d lines=%u pkt_pts=%7.3f\n",
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ctx, pkt->size, lines, (double)pkt->pts/90000.0);
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if (lines > 0) {
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#ifdef DEBUG
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int i;
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av_log(avctx, AV_LOG_DEBUG, "line numbers:");
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for(i = 0; i < lines; i++)
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av_log(avctx, AV_LOG_DEBUG, " %d", ctx->sliced[i].line);
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av_log(avctx, AV_LOG_DEBUG, "\n");
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#endif
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vbi_decode(ctx->vbi, ctx->sliced, lines, 0.0);
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ctx->lines_processed += lines;
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}
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}
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ctx->pts = AV_NOPTS_VALUE;
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ret = ctx->handler_ret;
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}
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if (ret < 0)
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return ret;
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// is there a subtitle to pass?
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if (ctx->nb_pages) {
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int i;
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sub->format = ctx->format_id;
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sub->start_display_time = 0;
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sub->end_display_time = ctx->sub_duration;
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sub->num_rects = 0;
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sub->pts = ctx->pages->pts;
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|
|
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;
|
|
} 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)
|
|
*data_size = 1;
|
|
} else
|
|
*data_size = 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;
|
|
|
|
#ifdef DEBUG
|
|
{
|
|
char *t;
|
|
ctx->ex = vbi_export_new("text", &t);
|
|
}
|
|
#endif
|
|
av_log(avctx, AV_LOG_VERBOSE, "page filter: %s\n", ctx->pgno);
|
|
return (ctx->format_id == 1) ? ff_ass_subtitle_header_default(avctx) : 0;
|
|
}
|
|
|
|
static int teletext_close_decoder(AVCodecContext *avctx)
|
|
{
|
|
TeletextContext *ctx = avctx->priv_data;
|
|
|
|
av_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;
|
|
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", "list of teletext page numbers to decode, * is all", OFFSET(pgno), AV_OPT_TYPE_STRING, {.str = "*"}, 0, 0, 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)", OFFSET(format_id), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 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"},
|
|
{"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 = 30000}, 0, 86400000, SD},
|
|
{"txt_transparent", "force transparent background of the teletext", OFFSET(transparent_bg), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 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 = CODEC_CAP_DELAY,
|
|
.flush = teletext_flush,
|
|
.priv_class= &teletext_class,
|
|
};
|