1/* 2 * SSA/ASS encoder 3 * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "config_components.h" 23 24#include <string.h> 25 26#include "avcodec.h" 27#include "ass.h" 28#include "codec_internal.h" 29#include "libavutil/avstring.h" 30#include "libavutil/internal.h" 31#include "libavutil/mem.h" 32 33static av_cold int ass_encode_init(AVCodecContext *avctx) 34{ 35 avctx->extradata = av_malloc(avctx->subtitle_header_size + 1); 36 if (!avctx->extradata) 37 return AVERROR(ENOMEM); 38 memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size); 39 avctx->extradata_size = avctx->subtitle_header_size; 40 avctx->extradata[avctx->extradata_size] = 0; 41 return 0; 42} 43 44static int ass_encode_frame(AVCodecContext *avctx, 45 unsigned char *buf, int bufsize, 46 const AVSubtitle *sub) 47{ 48 int i, len, total_len = 0; 49 50 for (i=0; i<sub->num_rects; i++) { 51 const char *ass = sub->rects[i]->ass; 52 53 if (sub->rects[i]->type != SUBTITLE_ASS) { 54 av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n"); 55 return AVERROR(EINVAL); 56 } 57 58 len = av_strlcpy(buf+total_len, ass, bufsize-total_len); 59 60 if (len > bufsize-total_len-1) { 61 av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n"); 62 return AVERROR_BUFFER_TOO_SMALL; 63 } 64 65 total_len += len; 66 } 67 68 return total_len; 69} 70 71#if CONFIG_SSA_ENCODER 72const FFCodec ff_ssa_encoder = { 73 .p.name = "ssa", 74 .p.long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"), 75 .p.type = AVMEDIA_TYPE_SUBTITLE, 76 .p.id = AV_CODEC_ID_ASS, 77 .init = ass_encode_init, 78 FF_CODEC_ENCODE_SUB_CB(ass_encode_frame), 79 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 80}; 81#endif 82 83#if CONFIG_ASS_ENCODER 84const FFCodec ff_ass_encoder = { 85 .p.name = "ass", 86 .p.long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"), 87 .p.type = AVMEDIA_TYPE_SUBTITLE, 88 .p.id = AV_CODEC_ID_ASS, 89 .init = ass_encode_init, 90 FF_CODEC_ENCODE_SUB_CB(ass_encode_frame), 91 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 92}; 93#endif 94