| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * DVD subtitle decoding | ||
| 3 | * Copyright (c) 2005 Fabrice Bellard | ||
| 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 "libavutil/intreadwrite.h" | ||
| 25 | #include "libavutil/mem.h" | ||
| 26 | #include "avcodec.h" | ||
| 27 | |||
| 28 | /* parser definition */ | ||
| 29 | typedef struct DVDSubParseContext { | ||
| 30 | uint8_t *packet; | ||
| 31 | int packet_len; | ||
| 32 | int packet_index; | ||
| 33 | } DVDSubParseContext; | ||
| 34 | |||
| 35 | 12 | static int dvdsub_parse(AVCodecParserContext *s, | |
| 36 | AVCodecContext *avctx, | ||
| 37 | const uint8_t **poutbuf, int *poutbuf_size, | ||
| 38 | const uint8_t *buf, int buf_size) | ||
| 39 | { | ||
| 40 | 12 | DVDSubParseContext *pc = s->priv_data; | |
| 41 | |||
| 42 | 12 | *poutbuf = buf; | |
| 43 | 12 | *poutbuf_size = buf_size; | |
| 44 | |||
| 45 |
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12 | if (pc->packet_index == 0) { |
| 46 |
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4 | if (buf_size < 2 || (AV_RB16(buf) == 0 && buf_size < 6)) { |
| 47 |
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2 | if (buf_size) |
| 48 | ✗ | av_log(avctx, AV_LOG_DEBUG, "Parser input %d too small\n", buf_size); | |
| 49 | 2 | return buf_size; | |
| 50 | } | ||
| 51 | 2 | pc->packet_len = AV_RB16(buf); | |
| 52 |
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2 | if (pc->packet_len == 0) /* HD-DVD subpicture packet */ |
| 53 | ✗ | pc->packet_len = AV_RB32(buf+2); | |
| 54 | 2 | av_freep(&pc->packet); | |
| 55 |
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2 | if ((unsigned)pc->packet_len > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE) { |
| 56 | ✗ | av_log(avctx, AV_LOG_ERROR, "packet length %d is invalid\n", pc->packet_len); | |
| 57 | ✗ | return buf_size; | |
| 58 | } | ||
| 59 | 2 | pc->packet = av_malloc(pc->packet_len + AV_INPUT_BUFFER_PADDING_SIZE); | |
| 60 | } | ||
| 61 |
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10 | if (pc->packet) { |
| 62 |
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10 | if (pc->packet_index + buf_size <= pc->packet_len) { |
| 63 | 10 | memcpy(pc->packet + pc->packet_index, buf, buf_size); | |
| 64 | 10 | pc->packet_index += buf_size; | |
| 65 |
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10 | if (pc->packet_index >= pc->packet_len) { |
| 66 | 2 | *poutbuf = pc->packet; | |
| 67 | 2 | *poutbuf_size = pc->packet_len; | |
| 68 | 2 | pc->packet_index = 0; | |
| 69 | 2 | return buf_size; | |
| 70 | } | ||
| 71 | } else { | ||
| 72 | /* erroneous size */ | ||
| 73 | ✗ | pc->packet_index = 0; | |
| 74 | } | ||
| 75 | } | ||
| 76 | 8 | *poutbuf = NULL; | |
| 77 | 8 | *poutbuf_size = 0; | |
| 78 | 8 | return buf_size; | |
| 79 | } | ||
| 80 | |||
| 81 | 10 | static av_cold void dvdsub_parse_close(AVCodecParserContext *s) | |
| 82 | { | ||
| 83 | 10 | DVDSubParseContext *pc = s->priv_data; | |
| 84 | 10 | av_freep(&pc->packet); | |
| 85 | 10 | } | |
| 86 | |||
| 87 | const AVCodecParser ff_dvdsub_parser = { | ||
| 88 | .codec_ids = { AV_CODEC_ID_DVD_SUBTITLE }, | ||
| 89 | .priv_data_size = sizeof(DVDSubParseContext), | ||
| 90 | .parser_parse = dvdsub_parse, | ||
| 91 | .parser_close = dvdsub_parse_close, | ||
| 92 | }; | ||
| 93 |