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4243da4ff4
This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
94 lines
2.9 KiB
C
94 lines
2.9 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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int i, len, total_len = 0;
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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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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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}
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len = av_strlcpy(buf+total_len, ass, bufsize-total_len);
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if (len > bufsize-total_len-1) {
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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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total_len += len;
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}
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return total_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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.p.long_name = NULL_IF_CONFIG_SMALL("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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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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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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.p.long_name = NULL_IF_CONFIG_SMALL("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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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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#endif
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