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125 lines
4.1 KiB
125 lines
4.1 KiB
/* |
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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_split.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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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 -1; |
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} |
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if (strncmp(ass, "Dialogue: ", 10)) { |
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av_log(avctx, AV_LOG_ERROR, "AVSubtitle rectangle ass \"%s\"" |
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" does not look like a SSA markup\n", ass); |
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return AVERROR_INVALIDDATA; |
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} |
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if (avctx->codec->id == AV_CODEC_ID_ASS) { |
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long int layer; |
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char *p; |
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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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if (*p) p += strcspn(p, ",") + 1; // skip layer or marked |
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if (*p) p += strcspn(p, ",") + 1; // skip start timestamp |
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if (*p) p += strcspn(p, ",") + 1; // 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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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 -1; |
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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("SSA (SubStation Alpha) subtitle"), |
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.type = AVMEDIA_TYPE_SUBTITLE, |
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.id = AV_CODEC_ID_SSA, |
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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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