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https://github.com/FFmpeg/FFmpeg.git
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91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/*
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* SSA/ASS encoder
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* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.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 "config_components.h"
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#include <string.h>
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#include "avcodec.h"
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#include "ass.h"
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#include "codec_internal.h"
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#include "libavutil/avstring.h"
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#include "libavutil/internal.h"
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#include "libavutil/mem.h"
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static av_cold int ass_encode_init(AVCodecContext *avctx)
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{
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avctx->extradata = av_malloc(avctx->subtitle_header_size + 1);
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if (!avctx->extradata)
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return AVERROR(ENOMEM);
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memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size);
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avctx->extradata_size = avctx->subtitle_header_size;
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avctx->extradata[avctx->extradata_size] = 0;
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return 0;
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}
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static int ass_encode_frame(AVCodecContext *avctx,
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unsigned char *buf, int bufsize,
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const AVSubtitle *sub)
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{
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size_t len;
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if (sub->num_rects != 1) {
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av_log(avctx, AV_LOG_ERROR, "Only one rect per AVSubtitle is supported in ASS.\n");
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return AVERROR_INVALIDDATA;
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}
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if (sub->rects[0]->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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}
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len = av_strlcpy(buf, sub->rects[0]->ass, bufsize);
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if (len >= bufsize) {
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av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
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return AVERROR_BUFFER_TOO_SMALL;
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}
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return len;
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}
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#if CONFIG_SSA_ENCODER
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const FFCodec ff_ssa_encoder = {
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.p.name = "ssa",
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CODEC_LONG_NAME("ASS (Advanced SubStation Alpha) subtitle"),
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.p.type = AVMEDIA_TYPE_SUBTITLE,
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.p.id = AV_CODEC_ID_ASS,
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.init = ass_encode_init,
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FF_CODEC_ENCODE_SUB_CB(ass_encode_frame),
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};
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#endif
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#if CONFIG_ASS_ENCODER
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const FFCodec ff_ass_encoder = {
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.p.name = "ass",
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CODEC_LONG_NAME("ASS (Advanced SubStation Alpha) subtitle"),
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.p.type = AVMEDIA_TYPE_SUBTITLE,
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.p.id = AV_CODEC_ID_ASS,
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.init = ass_encode_init,
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FF_CODEC_ENCODE_SUB_CB(ass_encode_frame),
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};
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#endif
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