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/* |
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* DVD subtitle decoding |
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* Copyright (c) 2005 Fabrice Bellard |
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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 "libavutil/intreadwrite.h" |
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#include "libavutil/mem.h" |
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#include "avcodec.h" |
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/* parser definition */ |
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typedef struct DVDSubParseContext { |
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uint8_t *packet; |
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int packet_len; |
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int packet_index; |
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} DVDSubParseContext; |
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static av_cold int dvdsub_parse_init(AVCodecParserContext *s) |
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{ |
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return 0; |
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} |
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static int dvdsub_parse(AVCodecParserContext *s, |
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AVCodecContext *avctx, |
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const uint8_t **poutbuf, int *poutbuf_size, |
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const uint8_t *buf, int buf_size) |
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{ |
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DVDSubParseContext *pc = s->priv_data; |
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*poutbuf = buf; |
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*poutbuf_size = buf_size; |
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✓✓ |
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if (pc->packet_index == 0) { |
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✓✓✓✗
✗✓ |
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if (buf_size < 2 || AV_RB16(buf) && buf_size < 6) { |
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✗✓ |
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if (buf_size) |
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av_log(avctx, AV_LOG_DEBUG, "Parser input %d too small\n", buf_size); |
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return buf_size; |
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} |
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pc->packet_len = AV_RB16(buf); |
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✗✓ |
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if (pc->packet_len == 0) /* HD-DVD subpicture packet */ |
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pc->packet_len = AV_RB32(buf+2); |
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av_freep(&pc->packet); |
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✗✓ |
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if ((unsigned)pc->packet_len > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE) { |
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av_log(avctx, AV_LOG_ERROR, "packet length %d is invalid\n", pc->packet_len); |
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return buf_size; |
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} |
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pc->packet = av_malloc(pc->packet_len + AV_INPUT_BUFFER_PADDING_SIZE); |
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} |
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✓✗ |
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if (pc->packet) { |
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✓✗ |
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if (pc->packet_index + buf_size <= pc->packet_len) { |
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memcpy(pc->packet + pc->packet_index, buf, buf_size); |
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pc->packet_index += buf_size; |
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✓✓ |
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if (pc->packet_index >= pc->packet_len) { |
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*poutbuf = pc->packet; |
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*poutbuf_size = pc->packet_len; |
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pc->packet_index = 0; |
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return buf_size; |
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} |
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} else { |
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/* erroneous size */ |
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pc->packet_index = 0; |
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} |
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} |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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return buf_size; |
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} |
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static av_cold void dvdsub_parse_close(AVCodecParserContext *s) |
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{ |
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DVDSubParseContext *pc = s->priv_data; |
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av_freep(&pc->packet); |
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} |
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AVCodecParser ff_dvdsub_parser = { |
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.codec_ids = { AV_CODEC_ID_DVD_SUBTITLE }, |
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.priv_data_size = sizeof(DVDSubParseContext), |
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.parser_init = dvdsub_parse_init, |
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.parser_parse = dvdsub_parse, |
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.parser_close = dvdsub_parse_close, |
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}; |