1/* 2 * SSA/ASS decoder 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 <string.h> 23 24#include "avcodec.h" 25#include "ass.h" 26#include "codec_internal.h" 27#include "config_components.h" 28#include "libavutil/internal.h" 29#include "libavutil/mem.h" 30 31static av_cold int ass_decode_init(AVCodecContext *avctx) 32{ 33 avctx->subtitle_header = av_malloc(avctx->extradata_size + 1); 34 if (!avctx->subtitle_header) 35 return AVERROR(ENOMEM); 36 if (avctx->extradata_size) 37 memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size); 38 avctx->subtitle_header[avctx->extradata_size] = 0; 39 avctx->subtitle_header_size = avctx->extradata_size; 40 return 0; 41} 42 43static int ass_decode_frame(AVCodecContext *avctx, AVSubtitle *sub, 44 int *got_sub_ptr, const AVPacket *avpkt) 45{ 46 if (avpkt->size <= 0) 47 return avpkt->size; 48 49 sub->rects = av_malloc(sizeof(*sub->rects)); 50 if (!sub->rects) 51 return AVERROR(ENOMEM); 52 sub->rects[0] = av_mallocz(sizeof(*sub->rects[0])); 53 if (!sub->rects[0]) 54 return AVERROR(ENOMEM); 55 sub->num_rects = 1; 56 sub->rects[0]->type = SUBTITLE_ASS; 57 sub->rects[0]->ass = av_strdup(avpkt->data); 58 if (!sub->rects[0]->ass) 59 return AVERROR(ENOMEM); 60 *got_sub_ptr = 1; 61 return avpkt->size; 62} 63 64#if CONFIG_SSA_DECODER 65const FFCodec ff_ssa_decoder = { 66 .p.name = "ssa", 67 .p.long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"), 68 .p.type = AVMEDIA_TYPE_SUBTITLE, 69 .p.id = AV_CODEC_ID_ASS, 70 .init = ass_decode_init, 71 FF_CODEC_DECODE_SUB_CB(ass_decode_frame), 72 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 73}; 74#endif 75 76#if CONFIG_ASS_DECODER 77const FFCodec ff_ass_decoder = { 78 .p.name = "ass", 79 .p.long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"), 80 .p.type = AVMEDIA_TYPE_SUBTITLE, 81 .p.id = AV_CODEC_ID_ASS, 82 .init = ass_decode_init, 83 FF_CODEC_DECODE_SUB_CB(ass_decode_frame), 84 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 85}; 86#endif 87