128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
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/*
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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 <string.h>
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#include "avcodec.h"
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#include "ass.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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typedef struct {
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int id; ///< current event id, ReadOrder field
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} ASSEncodeContext;
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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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ASSEncodeContext *s = avctx->priv_data;
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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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char ass_line[2048];
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const char *ass = sub->rects[i]->ass;
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long int layer;
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char *p;
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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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#if FF_API_ASS_TIMING
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if (!strncmp(ass, "Dialogue: ", 10)) {
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if (i > 0) {
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av_log(avctx, AV_LOG_ERROR, "ASS encoder supports only one "
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"ASS rectangle field.\n");
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return AVERROR_INVALIDDATA;
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}
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ass += 10; // skip "Dialogue: "
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/* parse Layer field. If it's a Marked field, the content
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* will be "Marked=N" instead of the layer num, so we will
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* have layer=0, which is fine. */
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layer = strtol(ass, &p, 10);
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#define SKIP_ENTRY(ptr) do { \
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char *sep = strchr(ptr, ','); \
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if (sep) \
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ptr = sep + 1; \
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} while (0)
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SKIP_ENTRY(p); // skip layer or marked
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SKIP_ENTRY(p); // skip start timestamp
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SKIP_ENTRY(p); // skip end timestamp
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snprintf(ass_line, sizeof(ass_line), "%d,%ld,%s", ++s->id, layer, p);
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ass_line[strcspn(ass_line, "\r\n")] = 0;
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ass = ass_line;
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}
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#endif
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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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AVCodec ff_ssa_encoder = {
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.name = "ssa",
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.long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"),
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.type = AVMEDIA_TYPE_SUBTITLE,
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.id = AV_CODEC_ID_ASS,
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.init = ass_encode_init,
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.encode_sub = ass_encode_frame,
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.priv_data_size = sizeof(ASSEncodeContext),
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};
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#endif
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#if CONFIG_ASS_ENCODER
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AVCodec ff_ass_encoder = {
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.name = "ass",
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.long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"),
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.type = AVMEDIA_TYPE_SUBTITLE,
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.id = AV_CODEC_ID_ASS,
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.init = ass_encode_init,
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.encode_sub = ass_encode_frame,
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.priv_data_size = sizeof(ASSEncodeContext),
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};
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#endif
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