mirror of
https://github.com/FFmpeg/FFmpeg.git
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121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
/*
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* SSA/ASS decoder
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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 "ass_split.h"
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#include "libavutil/internal.h"
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#include "libavutil/mem.h"
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static av_cold int ass_decode_init(AVCodecContext *avctx)
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{
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avctx->subtitle_header = av_malloc(avctx->extradata_size + 1);
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if (!avctx->subtitle_header)
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return AVERROR(ENOMEM);
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memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size);
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avctx->subtitle_header[avctx->extradata_size] = 0;
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avctx->subtitle_header_size = avctx->extradata_size;
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avctx->priv_data = ff_ass_split(avctx->extradata);
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if(!avctx->priv_data)
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return -1;
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return 0;
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}
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static int ass_decode_close(AVCodecContext *avctx)
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{
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ff_ass_split_free(avctx->priv_data);
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avctx->priv_data = NULL;
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return 0;
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}
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#if CONFIG_SSA_DECODER
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static int ssa_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr,
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AVPacket *avpkt)
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{
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const char *ptr = avpkt->data;
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int len, size = avpkt->size;
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while (size > 0) {
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int duration;
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ASSDialog *dialog = ff_ass_split_dialog(avctx->priv_data, ptr, 0, NULL);
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if (!dialog)
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return AVERROR_INVALIDDATA;
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duration = dialog->end - dialog->start;
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len = ff_ass_add_rect(data, ptr, 0, duration, 1);
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if (len < 0)
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return len;
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ptr += len;
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size -= len;
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}
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*got_sub_ptr = avpkt->size > 0;
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return avpkt->size;
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}
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AVCodec ff_ssa_decoder = {
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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_decode_init,
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.decode = ssa_decode_frame,
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.close = ass_decode_close,
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};
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#endif
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#if CONFIG_ASS_DECODER
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static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr,
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AVPacket *avpkt)
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{
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int ret;
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AVSubtitle *sub = data;
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const char *ptr = avpkt->data;
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static const AVRational ass_tb = {1, 100};
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const int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, ass_tb);
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const int ts_duration = av_rescale_q(avpkt->duration, avctx->time_base, ass_tb);
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if (avpkt->size <= 0)
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return avpkt->size;
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ret = ff_ass_add_rect(sub, ptr, ts_start, ts_duration, 2);
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if (ret < 0) {
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if (ret == AVERROR_INVALIDDATA)
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av_log(avctx, AV_LOG_ERROR, "Invalid ASS packet\n");
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return ret;
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}
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*got_sub_ptr = avpkt->size > 0;
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return avpkt->size;
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}
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AVCodec ff_ass_decoder = {
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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_decode_init,
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.decode = ass_decode_frame,
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.close = ass_decode_close,
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};
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#endif
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