/* * SSA/ASS decoder * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <string.h> #include "avcodec.h" #include "ass.h" #include "ass_split.h" #include "libavutil/internal.h" #include "libavutil/mem.h" static av_cold int ass_decode_init(AVCodecContext *avctx) { avctx->subtitle_header = av_malloc(avctx->extradata_size + 1); if (!avctx->subtitle_header) return AVERROR(ENOMEM); memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size); avctx->subtitle_header[avctx->extradata_size] = 0; avctx->subtitle_header_size = avctx->extradata_size; avctx->priv_data = ff_ass_split(avctx->extradata); if(!avctx->priv_data) return -1; return 0; } static int ass_decode_close(AVCodecContext *avctx) { ff_ass_split_free(avctx->priv_data); avctx->priv_data = NULL; return 0; } #if CONFIG_SSA_DECODER static int ssa_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt) { const char *ptr = avpkt->data; int len, size = avpkt->size; while (size > 0) { int duration; ASSDialog *dialog = ff_ass_split_dialog(avctx->priv_data, ptr, 0, NULL); if (!dialog) return AVERROR_INVALIDDATA; duration = dialog->end - dialog->start; len = ff_ass_add_rect(data, ptr, 0, duration, 1); if (len < 0) return len; ptr += len; size -= len; } *got_sub_ptr = avpkt->size > 0; return avpkt->size; } AVCodec ff_ssa_decoder = { .name = "ssa", .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"), .type = AVMEDIA_TYPE_SUBTITLE, .id = AV_CODEC_ID_SSA, .init = ass_decode_init, .decode = ssa_decode_frame, .close = ass_decode_close, }; #endif #if CONFIG_ASS_DECODER static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt) { int ret; AVSubtitle *sub = data; const char *ptr = avpkt->data; static const AVRational ass_tb = {1, 100}; const int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, ass_tb); const int ts_duration = av_rescale_q(avpkt->duration, avctx->time_base, ass_tb); if (avpkt->size <= 0) return avpkt->size; ret = ff_ass_add_rect(sub, ptr, ts_start, ts_duration, 2); if (ret < 0) { if (ret == AVERROR_INVALIDDATA) av_log(avctx, AV_LOG_ERROR, "Invalid ASS packet\n"); return ret; } *got_sub_ptr = avpkt->size > 0; return avpkt->size; } AVCodec ff_ass_decoder = { .name = "ass", .long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"), .type = AVMEDIA_TYPE_SUBTITLE, .id = AV_CODEC_ID_ASS, .init = ass_decode_init, .decode = ass_decode_frame, .close = ass_decode_close, }; #endif