| 1 | /* |
| 2 | * DVD navigation block parser for FFmpeg |
| 3 | * Copyright (c) 2013 The FFmpeg Project |
| 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 | #include "avcodec.h" |
| 22 | #include "get_bits.h" |
| 23 | #include "parser.h" |
| 24 | |
| 25 | #define PCI_SIZE 980 |
| 26 | #define DSI_SIZE 1018 |
| 27 | |
| 28 | /* parser definition */ |
| 29 | typedef struct DVDNavParseContext { |
| 30 | uint32_t lba; |
| 31 | uint8_t buffer[PCI_SIZE+DSI_SIZE]; |
| 32 | int copied; |
| 33 | } DVDNavParseContext; |
| 34 | |
| 35 | static av_cold int dvd_nav_parse_init(AVCodecParserContext *s) |
| 36 | { |
| 37 | DVDNavParseContext *pc = s->priv_data; |
| 38 | |
| 39 | pc->lba = 0xFFFFFFFF; |
| 40 | pc->copied = 0; |
| 41 | return 0; |
| 42 | } |
| 43 | |
| 44 | static int dvd_nav_parse(AVCodecParserContext *s, |
| 45 | AVCodecContext *avctx, |
| 46 | const uint8_t **poutbuf, int *poutbuf_size, |
| 47 | const uint8_t *buf, int buf_size) |
| 48 | { |
| 49 | DVDNavParseContext *pc1 = s->priv_data; |
| 50 | int lastPacket = 0; |
| 51 | int valid = 0; |
| 52 | |
| 53 | s->pict_type = AV_PICTURE_TYPE_NONE; |
| 54 | |
| 55 | avctx->time_base.num = 1; |
| 56 | avctx->time_base.den = 90000; |
| 57 | |
| 58 | if (buf && buf_size) { |
| 59 | switch(buf[0]) { |
| 60 | case 0x00: |
| 61 | if (buf_size == PCI_SIZE) { |
| 62 | /* PCI */ |
| 63 | uint32_t lba = AV_RB32(&buf[0x01]); |
| 64 | uint32_t startpts = AV_RB32(&buf[0x0D]); |
| 65 | uint32_t endpts = AV_RB32(&buf[0x11]); |
| 66 | |
| 67 | if (endpts > startpts) { |
| 68 | pc1->lba = lba; |
| 69 | s->pts = (int64_t)startpts; |
| 70 | s->duration = endpts - startpts; |
| 71 | |
| 72 | memcpy(pc1->buffer, buf, PCI_SIZE); |
| 73 | pc1->copied = PCI_SIZE; |
| 74 | valid = 1; |
| 75 | } |
| 76 | } |
| 77 | break; |
| 78 | |
| 79 | case 0x01: |
| 80 | if ((buf_size == DSI_SIZE) && (pc1->copied == PCI_SIZE)) { |
| 81 | /* DSI */ |
| 82 | uint32_t lba = AV_RB32(&buf[0x05]); |
| 83 | |
| 84 | if (lba == pc1->lba) { |
| 85 | memcpy(pc1->buffer + pc1->copied, buf, DSI_SIZE); |
| 86 | lastPacket = 1; |
| 87 | valid = 1; |
| 88 | } |
| 89 | } |
| 90 | break; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | if (!valid || lastPacket) { |
| 95 | pc1->copied = 0; |
| 96 | pc1->lba = 0xFFFFFFFF; |
| 97 | } |
| 98 | |
| 99 | if (lastPacket) { |
| 100 | *poutbuf = pc1->buffer; |
| 101 | *poutbuf_size = sizeof(pc1->buffer); |
| 102 | } else { |
| 103 | *poutbuf = NULL; |
| 104 | *poutbuf_size = 0; |
| 105 | } |
| 106 | |
| 107 | return buf_size; |
| 108 | } |
| 109 | |
| 110 | AVCodecParser ff_dvd_nav_parser = { |
| 111 | .codec_ids = { AV_CODEC_ID_DVD_NAV }, |
| 112 | .priv_data_size = sizeof(DVDNavParseContext), |
| 113 | .parser_init = dvd_nav_parse_init, |
| 114 | .parser_parse = dvd_nav_parse, |
| 115 | }; |