mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
08bebeb1be
Some callers assume that item_name is always set, so this may be
considered an API break.
This reverts commit 0c6203c97a.
714 lines
22 KiB
C
714 lines
22 KiB
C
/*
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* 3GPP TS 26.245 Timed Text encoder
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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 <stdarg.h>
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#include "avcodec.h"
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#include "libavutil/opt.h"
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#include "libavutil/avstring.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mem.h"
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#include "libavutil/common.h"
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#include "ass_split.h"
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#include "ass.h"
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#include "bytestream.h"
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#include "codec_internal.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 STYLE_RECORD_SIZE 12
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#define SIZE_ADD 10
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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 DEFAULT_STYLE_FONT_ID 0x01
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#define DEFAULT_STYLE_FONTSIZE 0x12
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#define DEFAULT_STYLE_COLOR 0xffffffff
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#define DEFAULT_STYLE_FLAG 0x00
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#define BGR_TO_RGB(c) (((c) & 0xff) << 16 | ((c) & 0xff00) | (((uint32_t)(c) >> 16) & 0xff))
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#define FONTSIZE_SCALE(s,fs) ((fs) * (s)->font_scale_factor + 0.5)
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#define av_bprint_append_any(buf, data, size) av_bprint_append_data(buf, ((const char*)data), size)
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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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uint16_t style_fontID;
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uint8_t style_fontsize;
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uint32_t style_color;
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} StyleBox;
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typedef struct {
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uint16_t start;
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uint16_t end;
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} HighlightBox;
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typedef struct {
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uint32_t color;
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} HilightcolorBox;
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typedef struct {
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AVClass *class;
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AVCodecContext *avctx;
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ASSSplitContext *ass_ctx;
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ASSStyle *ass_dialog_style;
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StyleBox *style_attributes;
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unsigned count;
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unsigned style_attributes_bytes_allocated;
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StyleBox style_attributes_temp;
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AVBPrint buffer;
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HighlightBox hlit;
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HilightcolorBox hclr;
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uint8_t box_flags;
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StyleBox d;
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uint16_t text_pos;
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char **fonts;
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int font_count;
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double font_scale_factor;
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int frame_height;
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} MovTextContext;
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typedef struct {
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void (*encode)(MovTextContext *s);
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} Box;
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static void mov_text_cleanup(MovTextContext *s)
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{
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s->count = 0;
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s->style_attributes_temp = s->d;
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}
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static void encode_styl(MovTextContext *s)
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{
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if ((s->box_flags & STYL_BOX) && s->count) {
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uint8_t buf[12], *p = buf;
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bytestream_put_be32(&p, s->count * STYLE_RECORD_SIZE + SIZE_ADD);
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bytestream_put_be32(&p, MKBETAG('s','t','y','l'));
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bytestream_put_be16(&p, s->count);
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/*The above three attributes are hard coded for now
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but will come from ASS style in the future*/
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av_bprint_append_any(&s->buffer, buf, 10);
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for (unsigned j = 0; j < s->count; j++) {
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const StyleBox *style = &s->style_attributes[j];
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p = buf;
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bytestream_put_be16(&p, style->style_start);
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bytestream_put_be16(&p, style->style_end);
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bytestream_put_be16(&p, style->style_fontID);
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bytestream_put_byte(&p, style->style_flag);
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bytestream_put_byte(&p, style->style_fontsize);
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bytestream_put_be32(&p, style->style_color);
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av_bprint_append_any(&s->buffer, buf, 12);
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}
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}
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mov_text_cleanup(s);
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}
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static void encode_hlit(MovTextContext *s)
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{
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if (s->box_flags & HLIT_BOX) {
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uint8_t buf[12], *p = buf;
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bytestream_put_be32(&p, 12);
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bytestream_put_be32(&p, MKBETAG('h','l','i','t'));
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bytestream_put_be16(&p, s->hlit.start);
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bytestream_put_be16(&p, s->hlit.end);
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av_bprint_append_any(&s->buffer, buf, 12);
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}
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}
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static void encode_hclr(MovTextContext *s)
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{
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if (s->box_flags & HCLR_BOX) {
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uint8_t buf[12], *p = buf;
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bytestream_put_be32(&p, 12);
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bytestream_put_be32(&p, MKBETAG('h','c','l','r'));
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bytestream_put_be32(&p, s->hclr.color);
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av_bprint_append_any(&s->buffer, buf, 12);
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}
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}
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static const Box box_types[] = {
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{ encode_styl },
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{ encode_hlit },
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{ encode_hclr },
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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 mov_text_encode_close(AVCodecContext *avctx)
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{
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MovTextContext *s = avctx->priv_data;
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ff_ass_split_free(s->ass_ctx);
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av_freep(&s->style_attributes);
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av_freep(&s->fonts);
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av_bprint_finalize(&s->buffer, NULL);
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return 0;
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}
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static int encode_sample_description(AVCodecContext *avctx)
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{
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ASS *ass;
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ASSStyle *style;
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int i, j;
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uint32_t back_color = 0;
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int font_names_total_len = 0;
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MovTextContext *s = avctx->priv_data;
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uint8_t buf[30], *p = buf;
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// 0x00, 0x00, 0x00, 0x00, // uint32_t displayFlags
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// 0x01, // int8_t horizontal-justification
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// 0xFF, // int8_t vertical-justification
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// 0x00, 0x00, 0x00, 0x00, // uint8_t background-color-rgba[4]
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// BoxRecord {
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// 0x00, 0x00, // int16_t top
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// 0x00, 0x00, // int16_t left
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// 0x00, 0x00, // int16_t bottom
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// 0x00, 0x00, // int16_t right
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// };
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// StyleRecord {
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// 0x00, 0x00, // uint16_t startChar
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// 0x00, 0x00, // uint16_t endChar
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// 0x00, 0x01, // uint16_t font-ID
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// 0x00, // uint8_t face-style-flags
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// 0x12, // uint8_t font-size
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// 0xFF, 0xFF, 0xFF, 0xFF, // uint8_t text-color-rgba[4]
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// };
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// FontTableBox {
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// 0x00, 0x00, 0x00, 0x12, // uint32_t size
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// 'f', 't', 'a', 'b', // uint8_t name[4]
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// 0x00, 0x01, // uint16_t entry-count
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// FontRecord {
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// 0x00, 0x01, // uint16_t font-ID
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// 0x05, // uint8_t font-name-length
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// 'S', 'e', 'r', 'i', 'f',// uint8_t font[font-name-length]
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// };
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// };
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// Populate sample description from ASS header
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ass = (ASS*)s->ass_ctx;
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// Compute font scaling factor based on (optionally) provided
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// output video height and ASS script play_res_y
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if (s->frame_height && ass->script_info.play_res_y)
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s->font_scale_factor = (double)s->frame_height / ass->script_info.play_res_y;
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else
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s->font_scale_factor = 1;
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style = ff_ass_style_get(s->ass_ctx, "Default");
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if (!style && ass->styles_count) {
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style = &ass->styles[0];
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}
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s->d.style_fontID = DEFAULT_STYLE_FONT_ID;
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s->d.style_fontsize = DEFAULT_STYLE_FONTSIZE;
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s->d.style_color = DEFAULT_STYLE_COLOR;
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s->d.style_flag = DEFAULT_STYLE_FLAG;
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if (style) {
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s->d.style_fontsize = FONTSIZE_SCALE(s, style->font_size);
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s->d.style_color = BGR_TO_RGB(style->primary_color & 0xffffff) << 8 |
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255 - ((uint32_t)style->primary_color >> 24);
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s->d.style_flag = (!!style->bold * STYLE_FLAG_BOLD) |
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(!!style->italic * STYLE_FLAG_ITALIC) |
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(!!style->underline * STYLE_FLAG_UNDERLINE);
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back_color = (BGR_TO_RGB(style->back_color & 0xffffff) << 8) |
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(255 - ((uint32_t)style->back_color >> 24));
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}
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bytestream_put_be32(&p, 0); // displayFlags
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bytestream_put_be16(&p, 0x01FF); // horizontal/vertical justification (2x int8_t)
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bytestream_put_be32(&p, back_color);
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bytestream_put_be64(&p, 0); // BoxRecord - 4xint16_t: top, left, bottom, right
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// StyleRecord {
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bytestream_put_be16(&p, s->d.style_start);
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bytestream_put_be16(&p, s->d.style_end);
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bytestream_put_be16(&p, s->d.style_fontID);
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bytestream_put_byte(&p, s->d.style_flag);
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bytestream_put_byte(&p, s->d.style_fontsize);
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bytestream_put_be32(&p, s->d.style_color);
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// };
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av_bprint_append_any(&s->buffer, buf, 30);
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// Build font table
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// We can't build a complete font table since that would require
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// scanning all dialogs first. But we can at least fill in what
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// is avaiable in the ASS header
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if (style && ass->styles_count) {
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// Find unique font names
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if (style->font_name) {
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av_dynarray_add(&s->fonts, &s->font_count, style->font_name);
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font_names_total_len += strlen(style->font_name);
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}
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for (i = 0; i < ass->styles_count; i++) {
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int found = 0;
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if (!ass->styles[i].font_name)
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continue;
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for (j = 0; j < s->font_count; j++) {
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if (!strcmp(s->fonts[j], ass->styles[i].font_name)) {
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found = 1;
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break;
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}
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}
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if (!found) {
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av_dynarray_add(&s->fonts, &s->font_count,
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ass->styles[i].font_name);
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font_names_total_len += strlen(ass->styles[i].font_name);
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}
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}
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} else
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av_dynarray_add(&s->fonts, &s->font_count, (char*)"Serif");
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// FontTableBox {
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p = buf;
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bytestream_put_be32(&p, SIZE_ADD + 3 * s->font_count + font_names_total_len); // Size
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bytestream_put_be32(&p, MKBETAG('f','t','a','b'));
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bytestream_put_be16(&p, s->font_count);
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av_bprint_append_any(&s->buffer, buf, 10);
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// FontRecord {
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for (i = 0; i < s->font_count; i++) {
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size_t len = strlen(s->fonts[i]);
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p = buf;
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bytestream_put_be16(&p, i + 1); //fontID
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bytestream_put_byte(&p, len);
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av_bprint_append_any(&s->buffer, buf, 3);
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av_bprint_append_any(&s->buffer, s->fonts[i], len);
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}
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// };
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// };
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if (!av_bprint_is_complete(&s->buffer)) {
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return AVERROR(ENOMEM);
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}
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avctx->extradata_size = s->buffer.len;
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avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!avctx->extradata) {
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return AVERROR(ENOMEM);
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}
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memcpy(avctx->extradata, s->buffer.str, avctx->extradata_size);
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av_bprint_clear(&s->buffer);
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return 0;
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}
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static av_cold int mov_text_encode_init(AVCodecContext *avctx)
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{
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int ret;
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MovTextContext *s = avctx->priv_data;
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s->avctx = avctx;
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av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
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s->ass_ctx = ff_ass_split(avctx->subtitle_header);
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if (!s->ass_ctx)
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return AVERROR_INVALIDDATA;
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ret = encode_sample_description(avctx);
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if (ret < 0)
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return ret;
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return 0;
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}
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// Start a new style box if needed
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static int mov_text_style_start(MovTextContext *s)
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{
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// there's an existing style entry
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if (s->style_attributes_temp.style_start == s->text_pos)
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// Still at same text pos, use same entry
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return 1;
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if (s->style_attributes_temp.style_flag != s->d.style_flag ||
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s->style_attributes_temp.style_color != s->d.style_color ||
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s->style_attributes_temp.style_fontID != s->d.style_fontID ||
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s->style_attributes_temp.style_fontsize != s->d.style_fontsize) {
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StyleBox *tmp;
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// last style != defaults, end the style entry and start a new one
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if (s->count + 1 > FFMIN(SIZE_MAX / sizeof(*s->style_attributes), UINT16_MAX) ||
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!(tmp = av_fast_realloc(s->style_attributes,
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&s->style_attributes_bytes_allocated,
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(s->count + 1) * sizeof(*s->style_attributes)))) {
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mov_text_cleanup(s);
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av_bprint_clear(&s->buffer);
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s->box_flags &= ~STYL_BOX;
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return 0;
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}
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s->style_attributes = tmp;
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s->style_attributes_temp.style_end = s->text_pos;
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s->style_attributes[s->count++] = s->style_attributes_temp;
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s->box_flags |= STYL_BOX;
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s->style_attributes_temp = s->d;
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s->style_attributes_temp.style_start = s->text_pos;
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} else { // style entry matches defaults, drop entry
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s->style_attributes_temp = s->d;
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s->style_attributes_temp.style_start = s->text_pos;
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}
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return 1;
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}
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static uint8_t mov_text_style_to_flag(const char style)
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{
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uint8_t style_flag = 0;
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switch (style){
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case 'b':
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style_flag = STYLE_FLAG_BOLD;
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break;
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case 'i':
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style_flag = STYLE_FLAG_ITALIC;
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break;
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case 'u':
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style_flag = STYLE_FLAG_UNDERLINE;
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break;
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}
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return style_flag;
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}
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static void mov_text_style_set(MovTextContext *s, uint8_t style_flags)
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{
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if (!((s->style_attributes_temp.style_flag & style_flags) ^ style_flags)) {
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// setting flags that that are already set
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return;
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}
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if (mov_text_style_start(s))
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s->style_attributes_temp.style_flag |= style_flags;
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}
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static void mov_text_style_cb(void *priv, const char style, int close)
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{
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MovTextContext *s = priv;
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uint8_t style_flag = mov_text_style_to_flag(style);
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if (!!(s->style_attributes_temp.style_flag & style_flag) != close) {
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// setting flag that is already set
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return;
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}
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if (mov_text_style_start(s)) {
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if (!close)
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s->style_attributes_temp.style_flag |= style_flag;
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else
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s->style_attributes_temp.style_flag &= ~style_flag;
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}
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}
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static void mov_text_color_set(MovTextContext *s, uint32_t color)
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{
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if ((s->style_attributes_temp.style_color & 0xffffff00) == color) {
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// color hasn't changed
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return;
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}
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if (mov_text_style_start(s))
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s->style_attributes_temp.style_color = (color & 0xffffff00) |
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(s->style_attributes_temp.style_color & 0xff);
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}
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static void mov_text_color_cb(void *priv, unsigned int color, unsigned int color_id)
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{
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MovTextContext *s = priv;
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color = BGR_TO_RGB(color) << 8;
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if (color_id == 1) { //primary color changes
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mov_text_color_set(s, color);
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} else if (color_id == 2) { //secondary color changes
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if (!(s->box_flags & HCLR_BOX))
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// Highlight alpha not set yet, use current primary alpha
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s->hclr.color = s->style_attributes_temp.style_color;
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if (!(s->box_flags & HLIT_BOX) || s->hlit.start == s->text_pos) {
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s->box_flags |= HCLR_BOX;
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s->box_flags |= HLIT_BOX;
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s->hlit.start = s->text_pos;
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s->hclr.color = color | (s->hclr.color & 0xFF);
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}
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else //close tag
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s->hlit.end = s->text_pos;
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/* If there are more than one secondary color changes in ASS,
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take start of first section and end of last section. Movtext
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allows only one highlight box per sample.
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*/
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}
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// Movtext does not support changes to other color_id (outline, background)
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}
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static void mov_text_alpha_set(MovTextContext *s, uint8_t alpha)
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{
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if ((s->style_attributes_temp.style_color & 0xff) == alpha) {
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// color hasn't changed
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return;
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}
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if (mov_text_style_start(s))
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s->style_attributes_temp.style_color =
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(s->style_attributes_temp.style_color & 0xffffff00) | alpha;
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}
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static void mov_text_alpha_cb(void *priv, int alpha, int alpha_id)
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{
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MovTextContext *s = priv;
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alpha = 255 - alpha;
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if (alpha_id == 1) // primary alpha changes
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mov_text_alpha_set(s, alpha);
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else if (alpha_id == 2) { //secondary alpha changes
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if (!(s->box_flags & HCLR_BOX))
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// Highlight color not set yet, use current primary color
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s->hclr.color = s->style_attributes_temp.style_color;
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if (!(s->box_flags & HLIT_BOX) || s->hlit.start == s->text_pos) {
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s->box_flags |= HCLR_BOX;
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s->box_flags |= HLIT_BOX;
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s->hlit.start = s->text_pos;
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s->hclr.color = (s->hclr.color & 0xffffff00) | alpha;
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}
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else //close tag
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s->hlit.end = s->text_pos;
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}
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// Movtext does not support changes to other alpha_id (outline, background)
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}
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static uint16_t find_font_id(MovTextContext *s, const char *name)
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{
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if (!name)
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return 1;
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for (int i = 0; i < s->font_count; i++) {
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if (!strcmp(name, s->fonts[i]))
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return i + 1;
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}
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return 1;
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}
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static void mov_text_font_name_set(MovTextContext *s, const char *name)
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{
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int fontID = find_font_id(s, name);
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if (s->style_attributes_temp.style_fontID == fontID) {
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// color hasn't changed
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return;
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}
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if (mov_text_style_start(s))
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s->style_attributes_temp.style_fontID = fontID;
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}
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static void mov_text_font_name_cb(void *priv, const char *name)
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{
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mov_text_font_name_set((MovTextContext*)priv, name);
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}
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static void mov_text_font_size_set(MovTextContext *s, int size)
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{
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size = FONTSIZE_SCALE(s, size);
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if (s->style_attributes_temp.style_fontsize == size) {
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// color hasn't changed
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return;
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}
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if (mov_text_style_start(s))
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s->style_attributes_temp.style_fontsize = size;
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}
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static void mov_text_font_size_cb(void *priv, int size)
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{
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mov_text_font_size_set((MovTextContext*)priv, size);
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}
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static void mov_text_end_cb(void *priv)
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{
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// End of text, close any open style record
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mov_text_style_start((MovTextContext*)priv);
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}
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static void mov_text_ass_style_set(MovTextContext *s, ASSStyle *style)
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{
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uint8_t style_flags, alpha;
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uint32_t color;
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if (style) {
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style_flags = (!!style->bold * STYLE_FLAG_BOLD) |
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(!!style->italic * STYLE_FLAG_ITALIC) |
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(!!style->underline * STYLE_FLAG_UNDERLINE);
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mov_text_style_set(s, style_flags);
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color = BGR_TO_RGB(style->primary_color & 0xffffff) << 8;
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mov_text_color_set(s, color);
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alpha = 255 - ((uint32_t)style->primary_color >> 24);
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mov_text_alpha_set(s, alpha);
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mov_text_font_size_set(s, style->font_size);
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mov_text_font_name_set(s, style->font_name);
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} else {
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// End current style record, go back to defaults
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mov_text_style_start(s);
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}
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}
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static void mov_text_dialog(MovTextContext *s, ASSDialog *dialog)
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{
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ASSStyle *style = ff_ass_style_get(s->ass_ctx, dialog->style);
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s->ass_dialog_style = style;
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mov_text_ass_style_set(s, style);
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}
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static void mov_text_cancel_overrides_cb(void *priv, const char *style_name)
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{
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MovTextContext *s = priv;
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ASSStyle *style;
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if (!style_name || !*style_name)
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style = s->ass_dialog_style;
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else
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style= ff_ass_style_get(s->ass_ctx, style_name);
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mov_text_ass_style_set(s, style);
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}
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static unsigned utf8_strlen(const char *text, int len)
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{
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unsigned i = 0, ret = 0;
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while (i < len) {
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char c = text[i];
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if ((c & 0x80) == 0)
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i += 1;
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else if ((c & 0xE0) == 0xC0)
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i += 2;
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else if ((c & 0xF0) == 0xE0)
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i += 3;
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else if ((c & 0xF8) == 0xF0)
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i += 4;
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else
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return 0;
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ret++;
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}
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return ret;
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}
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|
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static void mov_text_text_cb(void *priv, const char *text, int len)
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{
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unsigned utf8_len = utf8_strlen(text, len);
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MovTextContext *s = priv;
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|
av_bprint_append_data(&s->buffer, text, len);
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// If it's not utf-8, just use the byte length
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s->text_pos += utf8_len ? utf8_len : len;
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}
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|
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static void mov_text_new_line_cb(void *priv, int forced)
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{
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MovTextContext *s = priv;
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s->text_pos += 1;
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av_bprint_chars(&s->buffer, '\n', 1);
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}
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|
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static const ASSCodesCallbacks mov_text_callbacks = {
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.text = mov_text_text_cb,
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.new_line = mov_text_new_line_cb,
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.style = mov_text_style_cb,
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.color = mov_text_color_cb,
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.alpha = mov_text_alpha_cb,
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.font_name = mov_text_font_name_cb,
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.font_size = mov_text_font_size_cb,
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.cancel_overrides = mov_text_cancel_overrides_cb,
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.end = mov_text_end_cb,
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};
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|
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static int mov_text_encode_frame(AVCodecContext *avctx, unsigned char *buf,
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int bufsize, const AVSubtitle *sub)
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|
{
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|
MovTextContext *s = avctx->priv_data;
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|
ASSDialog *dialog;
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|
int i, length;
|
|
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|
s->text_pos = 0;
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|
s->count = 0;
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|
s->box_flags = 0;
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|
av_bprint_clear(&s->buffer);
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for (i = 0; i < sub->num_rects; i++) {
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const char *ass = sub->rects[i]->ass;
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|
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if (sub->rects[i]->type != SUBTITLE_ASS) {
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av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
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return AVERROR(EINVAL);
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|
}
|
|
|
|
dialog = ff_ass_split_dialog(s->ass_ctx, ass);
|
|
if (!dialog)
|
|
return AVERROR(ENOMEM);
|
|
mov_text_dialog(s, dialog);
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|
ff_ass_split_override_codes(&mov_text_callbacks, s, dialog->text);
|
|
ff_ass_free_dialog(&dialog);
|
|
}
|
|
|
|
if (s->buffer.len > UINT16_MAX)
|
|
return AVERROR(ERANGE);
|
|
AV_WB16(buf, s->buffer.len);
|
|
buf += 2;
|
|
|
|
for (size_t j = 0; j < box_count; j++)
|
|
box_types[j].encode(s);
|
|
|
|
if (!av_bprint_is_complete(&s->buffer))
|
|
return AVERROR(ENOMEM);
|
|
|
|
if (!s->buffer.len)
|
|
return 0;
|
|
|
|
if (s->buffer.len > bufsize - 3) {
|
|
av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
|
|
return AVERROR_BUFFER_TOO_SMALL;
|
|
}
|
|
|
|
memcpy(buf, s->buffer.str, s->buffer.len);
|
|
length = s->buffer.len + 2;
|
|
|
|
return length;
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(MovTextContext, x)
|
|
#define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
|
|
static const AVOption options[] = {
|
|
{ "height", "Frame height, usually video height", OFFSET(frame_height), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass mov_text_encoder_class = {
|
|
.class_name = "MOV text enoder",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
const FFCodec ff_movtext_encoder = {
|
|
.p.name = "mov_text",
|
|
CODEC_LONG_NAME("3GPP Timed Text subtitle"),
|
|
.p.type = AVMEDIA_TYPE_SUBTITLE,
|
|
.p.id = AV_CODEC_ID_MOV_TEXT,
|
|
.priv_data_size = sizeof(MovTextContext),
|
|
.p.priv_class = &mov_text_encoder_class,
|
|
.init = mov_text_encode_init,
|
|
FF_CODEC_ENCODE_SUB_CB(mov_text_encode_frame),
|
|
.close = mov_text_encode_close,
|
|
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
|
|
};
|