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  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. };
  116.