forked from KolibriOS/kolibrios
533 lines
16 KiB
C
533 lines
16 KiB
C
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/*
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* 3GPP TS 26.245 Timed Text decoder
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* Copyright (c) 2012 Philip Langdale <philipl@overt.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 FFmpeg; 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 "ass.h"
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#include "libavutil/avstring.h"
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#include "libavutil/common.h"
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#include "libavutil/bprint.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mem.h"
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#define STYLE_FLAG_BOLD (1<<0)
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#define STYLE_FLAG_ITALIC (1<<1)
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#define STYLE_FLAG_UNDERLINE (1<<2)
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#define BOX_SIZE_INITIAL 40
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#define STYL_BOX (1<<0)
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#define HLIT_BOX (1<<1)
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#define HCLR_BOX (1<<2)
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#define TWRP_BOX (1<<3)
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#define BOTTOM_LEFT 1
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#define BOTTOM_CENTER 2
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#define BOTTOM_RIGHT 3
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#define MIDDLE_LEFT 4
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#define MIDDLE_CENTER 5
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#define MIDDLE_RIGHT 6
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#define TOP_LEFT 7
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#define TOP_CENTER 8
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#define TOP_RIGHT 9
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typedef struct {
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char *font;
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int fontsize;
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int color;
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int back_color;
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int bold;
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int italic;
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int underline;
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int alignment;
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} MovTextDefault;
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typedef struct {
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uint16_t fontID;
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char *font;
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} FontRecord;
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typedef struct {
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uint16_t style_start;
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uint16_t style_end;
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uint8_t style_flag;
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uint8_t fontsize;
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uint16_t style_fontID;
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} StyleBox;
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typedef struct {
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uint16_t hlit_start;
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uint16_t hlit_end;
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} HighlightBox;
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typedef struct {
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uint8_t hlit_color[4];
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} HilightcolorBox;
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typedef struct {
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uint8_t wrap_flag;
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} TextWrapBox;
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typedef struct {
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StyleBox **s;
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StyleBox *s_temp;
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HighlightBox h;
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HilightcolorBox c;
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FontRecord **ftab;
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FontRecord *ftab_temp;
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TextWrapBox w;
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MovTextDefault d;
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uint8_t box_flags;
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uint16_t style_entries, ftab_entries;
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uint64_t tracksize;
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int size_var;
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int count_s, count_f;
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} MovTextContext;
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typedef struct {
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uint32_t type;
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size_t base_size;
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int (*decode)(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt);
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} Box;
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static void mov_text_cleanup(MovTextContext *m)
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{
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int i;
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if (m->box_flags & STYL_BOX) {
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for(i = 0; i < m->count_s; i++) {
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av_freep(&m->s[i]);
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}
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av_freep(&m->s);
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}
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}
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static void mov_text_cleanup_ftab(MovTextContext *m)
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{
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int i;
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if (m->ftab_temp)
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av_freep(&m->ftab_temp->font);
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av_freep(&m->ftab_temp);
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if (m->ftab) {
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for(i = 0; i < m->count_f; i++) {
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av_freep(&m->ftab[i]->font);
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av_freep(&m->ftab[i]);
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}
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}
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av_freep(&m->ftab);
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}
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static int mov_text_tx3g(AVCodecContext *avctx, MovTextContext *m)
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{
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uint8_t *tx3g_ptr = avctx->extradata;
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int i, box_size, font_length;
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int8_t v_align, h_align;
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int style_fontID;
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StyleBox s_default;
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m->count_f = 0;
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m->ftab_entries = 0;
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box_size = BOX_SIZE_INITIAL; /* Size till ftab_entries */
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if (avctx->extradata_size < box_size)
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return -1;
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// Display Flags
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tx3g_ptr += 4;
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// Alignment
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h_align = *tx3g_ptr++;
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v_align = *tx3g_ptr++;
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if (h_align == 0) {
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if (v_align == 0)
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m->d.alignment = TOP_LEFT;
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if (v_align == 1)
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m->d.alignment = MIDDLE_LEFT;
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if (v_align == -1)
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m->d.alignment = BOTTOM_LEFT;
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}
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if (h_align == 1) {
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if (v_align == 0)
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m->d.alignment = TOP_CENTER;
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if (v_align == 1)
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m->d.alignment = MIDDLE_CENTER;
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if (v_align == -1)
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m->d.alignment = BOTTOM_CENTER;
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}
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if (h_align == -1) {
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if (v_align == 0)
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m->d.alignment = TOP_RIGHT;
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if (v_align == 1)
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m->d.alignment = MIDDLE_RIGHT;
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if (v_align == -1)
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m->d.alignment = BOTTOM_RIGHT;
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}
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// Background Color
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m->d.back_color = AV_RB24(tx3g_ptr);
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tx3g_ptr += 4;
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// BoxRecord
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tx3g_ptr += 8;
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// StyleRecord
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tx3g_ptr += 4;
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// fontID
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style_fontID = AV_RB16(tx3g_ptr);
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tx3g_ptr += 2;
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// face-style-flags
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s_default.style_flag = *tx3g_ptr++;
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m->d.bold = s_default.style_flag & STYLE_FLAG_BOLD;
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m->d.italic = s_default.style_flag & STYLE_FLAG_ITALIC;
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m->d.underline = s_default.style_flag & STYLE_FLAG_UNDERLINE;
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// fontsize
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m->d.fontsize = *tx3g_ptr++;
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// Primary color
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m->d.color = AV_RB24(tx3g_ptr);
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tx3g_ptr += 4;
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// FontRecord
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// FontRecord Size
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tx3g_ptr += 4;
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// ftab
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tx3g_ptr += 4;
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m->ftab_entries = AV_RB16(tx3g_ptr);
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tx3g_ptr += 2;
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for (i = 0; i < m->ftab_entries; i++) {
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box_size += 3;
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if (avctx->extradata_size < box_size) {
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mov_text_cleanup_ftab(m);
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m->ftab_entries = 0;
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return -1;
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}
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m->ftab_temp = av_mallocz(sizeof(*m->ftab_temp));
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if (!m->ftab_temp) {
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mov_text_cleanup_ftab(m);
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return AVERROR(ENOMEM);
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}
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m->ftab_temp->fontID = AV_RB16(tx3g_ptr);
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tx3g_ptr += 2;
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font_length = *tx3g_ptr++;
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box_size = box_size + font_length;
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if (avctx->extradata_size < box_size) {
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mov_text_cleanup_ftab(m);
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m->ftab_entries = 0;
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return -1;
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}
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m->ftab_temp->font = av_malloc(font_length + 1);
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if (!m->ftab_temp->font) {
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mov_text_cleanup_ftab(m);
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return AVERROR(ENOMEM);
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}
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memcpy(m->ftab_temp->font, tx3g_ptr, font_length);
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m->ftab_temp->font[font_length] = '\0';
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av_dynarray_add(&m->ftab, &m->count_f, m->ftab_temp);
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if (!m->ftab) {
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mov_text_cleanup_ftab(m);
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return AVERROR(ENOMEM);
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}
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m->ftab_temp = NULL;
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tx3g_ptr = tx3g_ptr + font_length;
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}
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for (i = 0; i < m->ftab_entries; i++) {
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if (style_fontID == m->ftab[i]->fontID)
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m->d.font = m->ftab[i]->font;
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}
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return 0;
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}
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static int decode_twrp(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
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{
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m->box_flags |= TWRP_BOX;
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m->w.wrap_flag = *tsmb++;
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return 0;
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}
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static int decode_hlit(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
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{
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m->box_flags |= HLIT_BOX;
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m->h.hlit_start = AV_RB16(tsmb);
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tsmb += 2;
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m->h.hlit_end = AV_RB16(tsmb);
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tsmb += 2;
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return 0;
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}
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static int decode_hclr(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
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{
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m->box_flags |= HCLR_BOX;
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memcpy(m->c.hlit_color, tsmb, 4);
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tsmb += 4;
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return 0;
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}
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static int decode_styl(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt)
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{
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int i;
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m->style_entries = AV_RB16(tsmb);
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tsmb += 2;
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// A single style record is of length 12 bytes.
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if (m->tracksize + m->size_var + 2 + m->style_entries * 12 > avpkt->size)
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return -1;
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m->box_flags |= STYL_BOX;
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for(i = 0; i < m->style_entries; i++) {
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m->s_temp = av_malloc(sizeof(*m->s_temp));
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if (!m->s_temp) {
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mov_text_cleanup(m);
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return AVERROR(ENOMEM);
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}
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m->s_temp->style_start = AV_RB16(tsmb);
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tsmb += 2;
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m->s_temp->style_end = AV_RB16(tsmb);
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tsmb += 2;
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m->s_temp->style_fontID = AV_RB16(tsmb);
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tsmb += 2;
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m->s_temp->style_flag = AV_RB8(tsmb);
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tsmb++;
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m->s_temp->fontsize = AV_RB8(tsmb);
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av_dynarray_add(&m->s, &m->count_s, m->s_temp);
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if(!m->s) {
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mov_text_cleanup(m);
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return AVERROR(ENOMEM);
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}
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tsmb++;
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// text-color-rgba
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tsmb += 4;
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}
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return 0;
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}
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static const Box box_types[] = {
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{ MKBETAG('s','t','y','l'), 2, decode_styl },
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{ MKBETAG('h','l','i','t'), 4, decode_hlit },
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{ MKBETAG('h','c','l','r'), 4, decode_hclr },
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{ MKBETAG('t','w','r','p'), 1, decode_twrp }
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};
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const static size_t box_count = FF_ARRAY_ELEMS(box_types);
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static int text_to_ass(AVBPrint *buf, const char *text, const char *text_end,
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MovTextContext *m)
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{
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int i = 0;
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int j = 0;
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int text_pos = 0;
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if (text < text_end && m->box_flags & TWRP_BOX) {
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if (m->w.wrap_flag == 1) {
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av_bprintf(buf, "{\\q1}"); /* End of line wrap */
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} else {
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av_bprintf(buf, "{\\q2}"); /* No wrap */
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}
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}
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while (text < text_end) {
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if (m->box_flags & STYL_BOX) {
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for (i = 0; i < m->style_entries; i++) {
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if (m->s[i]->style_flag && text_pos == m->s[i]->style_end) {
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av_bprintf(buf, "{\\r}");
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}
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}
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for (i = 0; i < m->style_entries; i++) {
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if (m->s[i]->style_flag && text_pos == m->s[i]->style_start) {
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if (m->s[i]->style_flag & STYLE_FLAG_BOLD)
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av_bprintf(buf, "{\\b1}");
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if (m->s[i]->style_flag & STYLE_FLAG_ITALIC)
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av_bprintf(buf, "{\\i1}");
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if (m->s[i]->style_flag & STYLE_FLAG_UNDERLINE)
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av_bprintf(buf, "{\\u1}");
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av_bprintf(buf, "{\\fs%d}", m->s[i]->fontsize);
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for (j = 0; j < m->ftab_entries; j++) {
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if (m->s[i]->style_fontID == m->ftab[j]->fontID)
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av_bprintf(buf, "{\\fn%s}", m->ftab[j]->font);
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}
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}
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}
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}
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if (m->box_flags & HLIT_BOX) {
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|
|
if (text_pos == m->h.hlit_start) {
|
||
|
|
/* If hclr box is present, set the secondary color to the color
|
||
|
|
* specified. Otherwise, set primary color to white and secondary
|
||
|
|
* color to black. These colors will come from TextSampleModifier
|
||
|
|
* boxes in future and inverse video technique for highlight will
|
||
|
|
* be implemented.
|
||
|
|
*/
|
||
|
|
if (m->box_flags & HCLR_BOX) {
|
||
|
|
av_bprintf(buf, "{\\2c&H%02x%02x%02x&}", m->c.hlit_color[2],
|
||
|
|
m->c.hlit_color[1], m->c.hlit_color[0]);
|
||
|
|
} else {
|
||
|
|
av_bprintf(buf, "{\\1c&H000000&}{\\2c&HFFFFFF&}");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (text_pos == m->h.hlit_end) {
|
||
|
|
if (m->box_flags & HCLR_BOX) {
|
||
|
|
av_bprintf(buf, "{\\2c&H000000&}");
|
||
|
|
} else {
|
||
|
|
av_bprintf(buf, "{\\1c&HFFFFFF&}{\\2c&H000000&}");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (*text) {
|
||
|
|
case '\r':
|
||
|
|
break;
|
||
|
|
case '\n':
|
||
|
|
av_bprintf(buf, "\\N");
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
av_bprint_chars(buf, *text, 1);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
text++;
|
||
|
|
text_pos++;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int mov_text_init(AVCodecContext *avctx) {
|
||
|
|
/*
|
||
|
|
* TODO: Handle the default text style.
|
||
|
|
* NB: Most players ignore styles completely, with the result that
|
||
|
|
* it's very common to find files where the default style is broken
|
||
|
|
* and respecting it results in a worse experience than ignoring it.
|
||
|
|
*/
|
||
|
|
int ret;
|
||
|
|
MovTextContext *m = avctx->priv_data;
|
||
|
|
ret = mov_text_tx3g(avctx, m);
|
||
|
|
if (ret == 0) {
|
||
|
|
return ff_ass_subtitle_header(avctx, m->d.font, m->d.fontsize, m->d.color,
|
||
|
|
m->d.back_color, m->d.bold, m->d.italic,
|
||
|
|
m->d.underline, m->d.alignment);
|
||
|
|
} else
|
||
|
|
return ff_ass_subtitle_header_default(avctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int mov_text_decode_frame(AVCodecContext *avctx,
|
||
|
|
void *data, int *got_sub_ptr, AVPacket *avpkt)
|
||
|
|
{
|
||
|
|
AVSubtitle *sub = data;
|
||
|
|
MovTextContext *m = avctx->priv_data;
|
||
|
|
int ret, ts_start, ts_end;
|
||
|
|
AVBPrint buf;
|
||
|
|
char *ptr = avpkt->data;
|
||
|
|
char *end;
|
||
|
|
int text_length, tsmb_type, ret_tsmb;
|
||
|
|
uint64_t tsmb_size;
|
||
|
|
const uint8_t *tsmb;
|
||
|
|
|
||
|
|
if (!ptr || avpkt->size < 2)
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* A packet of size two with value zero is an empty subtitle
|
||
|
|
* used to mark the end of the previous non-empty subtitle.
|
||
|
|
* We can just drop them here as we have duration information
|
||
|
|
* already. If the value is non-zero, then it's technically a
|
||
|
|
* bad packet.
|
||
|
|
*/
|
||
|
|
if (avpkt->size == 2)
|
||
|
|
return AV_RB16(ptr) == 0 ? 0 : AVERROR_INVALIDDATA;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The first two bytes of the packet are the length of the text string
|
||
|
|
* In complex cases, there are style descriptors appended to the string
|
||
|
|
* so we can't just assume the packet size is the string size.
|
||
|
|
*/
|
||
|
|
text_length = AV_RB16(ptr);
|
||
|
|
end = ptr + FFMIN(2 + text_length, avpkt->size);
|
||
|
|
ptr += 2;
|
||
|
|
|
||
|
|
ts_start = av_rescale_q(avpkt->pts,
|
||
|
|
avctx->time_base,
|
||
|
|
(AVRational){1,100});
|
||
|
|
ts_end = av_rescale_q(avpkt->pts + avpkt->duration,
|
||
|
|
avctx->time_base,
|
||
|
|
(AVRational){1,100});
|
||
|
|
|
||
|
|
tsmb_size = 0;
|
||
|
|
m->tracksize = 2 + text_length;
|
||
|
|
m->style_entries = 0;
|
||
|
|
m->box_flags = 0;
|
||
|
|
m->count_s = 0;
|
||
|
|
// Note that the spec recommends lines be no longer than 2048 characters.
|
||
|
|
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
|
||
|
|
if (text_length + 2 != avpkt->size) {
|
||
|
|
while (m->tracksize + 8 <= avpkt->size) {
|
||
|
|
// A box is a minimum of 8 bytes.
|
||
|
|
tsmb = ptr + m->tracksize - 2;
|
||
|
|
tsmb_size = AV_RB32(tsmb);
|
||
|
|
tsmb += 4;
|
||
|
|
tsmb_type = AV_RB32(tsmb);
|
||
|
|
tsmb += 4;
|
||
|
|
|
||
|
|
if (tsmb_size == 1) {
|
||
|
|
if (m->tracksize + 16 > avpkt->size)
|
||
|
|
break;
|
||
|
|
tsmb_size = AV_RB64(tsmb);
|
||
|
|
tsmb += 8;
|
||
|
|
m->size_var = 16;
|
||
|
|
} else
|
||
|
|
m->size_var = 8;
|
||
|
|
//size_var is equal to 8 or 16 depending on the size of box
|
||
|
|
|
||
|
|
if (m->tracksize + tsmb_size > avpkt->size)
|
||
|
|
break;
|
||
|
|
|
||
|
|
for (size_t i = 0; i < box_count; i++) {
|
||
|
|
if (tsmb_type == box_types[i].type) {
|
||
|
|
if (m->tracksize + m->size_var + box_types[i].base_size > avpkt->size)
|
||
|
|
break;
|
||
|
|
ret_tsmb = box_types[i].decode(tsmb, m, avpkt);
|
||
|
|
if (ret_tsmb == -1)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
m->tracksize = m->tracksize + tsmb_size;
|
||
|
|
}
|
||
|
|
text_to_ass(&buf, ptr, end, m);
|
||
|
|
mov_text_cleanup(m);
|
||
|
|
} else
|
||
|
|
text_to_ass(&buf, ptr, end, m);
|
||
|
|
|
||
|
|
ret = ff_ass_add_rect_bprint(sub, &buf, ts_start, ts_end - ts_start);
|
||
|
|
av_bprint_finalize(&buf, NULL);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
*got_sub_ptr = sub->num_rects > 0;
|
||
|
|
return avpkt->size;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int mov_text_decode_close(AVCodecContext *avctx)
|
||
|
|
{
|
||
|
|
MovTextContext *m = avctx->priv_data;
|
||
|
|
mov_text_cleanup_ftab(m);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
AVCodec ff_movtext_decoder = {
|
||
|
|
.name = "mov_text",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("3GPP Timed Text subtitle"),
|
||
|
|
.type = AVMEDIA_TYPE_SUBTITLE,
|
||
|
|
.id = AV_CODEC_ID_MOV_TEXT,
|
||
|
|
.priv_data_size = sizeof(MovTextContext),
|
||
|
|
.init = mov_text_init,
|
||
|
|
.decode = mov_text_decode_frame,
|
||
|
|
.close = mov_text_decode_close,
|
||
|
|
};
|