repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
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 | }; |