mirror of
https://git.videolan.org/git/ffmpeg.git
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166 lines
5.2 KiB
C
166 lines
5.2 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 "ass_split.h"
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#include "ass.h"
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typedef struct {
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ASSSplitContext *ass_ctx;
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char buffer[2048];
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char *ptr;
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char *end;
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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 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);
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if (!avctx->extradata)
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return AVERROR(ENOMEM);
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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_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_assert0(s->end >= s->ptr);
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av_strlcpy(s->ptr, text, FFMIN(s->end - s->ptr, len + 1));
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s->ptr += FFMIN(s->end - s->ptr, 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_assert0(s->end >= s->ptr);
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av_strlcpy(s->ptr, "\n", FFMIN(s->end - s->ptr, 2));
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if (s->end > s->ptr)
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s->ptr++;
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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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};
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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, len, num;
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s->ptr = s->buffer;
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s->end = s->ptr + sizeof(s->buffer);
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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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}
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if (s->ptr == s->buffer)
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return 0;
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AV_WB16(buf, strlen(s->buffer));
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buf += 2;
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len = av_strlcpy(buf, s->buffer, bufsize - 2);
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if (len > bufsize-3) {
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av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
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return AVERROR(EINVAL);
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}
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return len + 2;
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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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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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