310 lines
10 KiB
C
310 lines
10 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/avassert.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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#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 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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} StyleBox;
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typedef struct {
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ASSSplitContext *ass_ctx;
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AVBPrint buffer;
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StyleBox **style_attributes;
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StyleBox *style_attributes_temp;
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int count;
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uint8_t style_box_flag;
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uint32_t tsmb_size;
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uint32_t tsmb_type;
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uint16_t style_entries;
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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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uint16_t text_pos;
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} MovTextContext;
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static av_cold int mov_text_encode_init(AVCodecContext *avctx)
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{
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/*
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* For now, we'll use a fixed default style. When we add styling
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* support, this will be generated from the ASS style.
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*/
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static const uint8_t text_sample_entry[] = {
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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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};
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MovTextContext *s = avctx->priv_data;
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avctx->extradata_size = sizeof text_sample_entry;
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avctx->extradata = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!avctx->extradata)
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return AVERROR(ENOMEM);
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av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
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memcpy(avctx->extradata, text_sample_entry, avctx->extradata_size);
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s->ass_ctx = ff_ass_split(avctx->subtitle_header);
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return s->ass_ctx ? 0 : AVERROR_INVALIDDATA;
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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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if (!close) {
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if (s->style_box_flag == 0) { //first style entry
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s->style_attributes_temp = av_malloc(sizeof(*s->style_attributes_temp));
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if (!s->style_attributes_temp) {
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av_bprint_clear(&s->buffer);
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s->style_box_flag = 0;
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return;
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}
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s->style_attributes_temp->style_flag = 0;
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s->style_attributes_temp->style_start = AV_RB16(&s->text_pos);
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} else {
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if (s->style_attributes_temp->style_flag) { //break the style record here and start a new one
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s->style_attributes_temp->style_end = AV_RB16(&s->text_pos);
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av_dynarray_add(&s->style_attributes, &s->count, s->style_attributes_temp);
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s->style_attributes_temp = av_malloc(sizeof(*s->style_attributes_temp));
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if (!s->style_attributes_temp) {
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av_bprint_clear(&s->buffer);
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s->style_box_flag = 0;
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return;
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}
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s->style_attributes_temp->style_flag = s->style_attributes[s->count - 1]->style_flag;
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s->style_attributes_temp->style_start = AV_RB16(&s->text_pos);
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} else {
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s->style_attributes_temp->style_flag = 0;
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s->style_attributes_temp->style_start = AV_RB16(&s->text_pos);
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}
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}
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switch (style){
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case 'b':
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s->style_attributes_temp->style_flag |= STYLE_FLAG_BOLD;
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break;
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case 'i':
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s->style_attributes_temp->style_flag |= STYLE_FLAG_ITALIC;
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break;
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case 'u':
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s->style_attributes_temp->style_flag |= STYLE_FLAG_UNDERLINE;
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break;
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}
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} else {
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s->style_attributes_temp->style_end = AV_RB16(&s->text_pos);
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av_dynarray_add(&s->style_attributes, &s->count, s->style_attributes_temp);
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s->style_attributes_temp = av_malloc(sizeof(*s->style_attributes_temp));
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if (!s->style_attributes_temp) {
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av_bprint_clear(&s->buffer);
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s->style_box_flag = 0;
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return;
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}
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s->style_attributes_temp->style_flag = s->style_attributes[s->count - 1]->style_flag;
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switch (style){
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case 'b':
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s->style_attributes_temp->style_flag &= ~STYLE_FLAG_BOLD;
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break;
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case 'i':
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s->style_attributes_temp->style_flag &= ~STYLE_FLAG_ITALIC;
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break;
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case 'u':
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s->style_attributes_temp->style_flag &= ~STYLE_FLAG_UNDERLINE;
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break;
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}
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if (s->style_attributes_temp->style_flag) { //start of new style record
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s->style_attributes_temp->style_start = AV_RB16(&s->text_pos);
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}
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}
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s->style_box_flag = 1;
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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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MovTextContext *s = priv;
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av_bprint_append_data(&s->buffer, text, len);
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s->text_pos += len;
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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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av_bprint_append_data(&s->buffer, "\n", 1);
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s->text_pos += 1;
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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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};
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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, j, num, length;
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s->text_pos = 0;
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s->count = 0;
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s->style_box_flag = 0;
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s->style_entries = 0;
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for (i = 0; i < sub->num_rects; i++) {
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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(ENOSYS);
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}
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dialog = ff_ass_split_dialog(s->ass_ctx, sub->rects[i]->ass, 0, &num);
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for (; dialog && num--; dialog++) {
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ff_ass_split_override_codes(&mov_text_callbacks, s, dialog->text);
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}
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if (s->style_box_flag) {
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s->tsmb_size = s->count * STYLE_RECORD_SIZE + SIZE_ADD; //size of one style record is 12 bytes
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s->tsmb_size = AV_RB32(&s->tsmb_size);
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s->tsmb_type = MKTAG('s','t','y','l');
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s->style_entries = AV_RB16(&s->count);
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s->style_fontID = 0x00 | 0x01<<8;
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s->style_fontsize = 0x12;
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s->style_color = MKTAG(0xFF, 0xFF, 0xFF, 0xFF);
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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, &s->tsmb_size, 4);
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av_bprint_append_any(&s->buffer, &s->tsmb_type, 4);
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av_bprint_append_any(&s->buffer, &s->style_entries, 2);
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for (j = 0; j < s->count; j++) {
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av_bprint_append_any(&s->buffer, &s->style_attributes[j]->style_start, 2);
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av_bprint_append_any(&s->buffer, &s->style_attributes[j]->style_end, 2);
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av_bprint_append_any(&s->buffer, &s->style_fontID, 2);
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av_bprint_append_any(&s->buffer, &s->style_attributes[j]->style_flag, 1);
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av_bprint_append_any(&s->buffer, &s->style_fontsize, 1);
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av_bprint_append_any(&s->buffer, &s->style_color, 4);
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}
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for (j = 0; j < s->count; j++) {
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av_freep(&s->style_attributes[j]);
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}
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av_freep(&s->style_attributes);
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av_freep(&s->style_attributes_temp);
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}
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}
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AV_WB16(buf, s->text_pos);
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buf += 2;
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if (!av_bprint_is_complete(&s->buffer)) {
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length = AVERROR(ENOMEM);
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goto exit;
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}
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if (!s->buffer.len) {
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length = 0;
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goto exit;
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}
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if (s->buffer.len > bufsize - 3) {
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av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
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length = AVERROR(EINVAL);
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goto exit;
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}
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memcpy(buf, s->buffer.str, s->buffer.len);
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length = s->buffer.len + 2;
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exit:
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av_bprint_clear(&s->buffer);
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return length;
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}
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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_bprint_finalize(&s->buffer, NULL);
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return 0;
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}
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AVCodec ff_movtext_encoder = {
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.name = "mov_text",
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.long_name = NULL_IF_CONFIG_SMALL("3GPP Timed Text subtitle"),
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.type = AVMEDIA_TYPE_SUBTITLE,
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.id = AV_CODEC_ID_MOV_TEXT,
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.priv_data_size = sizeof(MovTextContext),
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.init = mov_text_encode_init,
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.encode_sub = mov_text_encode_frame,
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.close = mov_text_encode_close,
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};
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