yading@10: /*
yading@10:  * DVD navigation block parser for FFmpeg
yading@10:  * Copyright (c) 2013 The FFmpeg Project
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: #include "avcodec.h"
yading@10: #include "dsputil.h"
yading@10: #include "get_bits.h"
yading@10: #include "parser.h"
yading@10: 
yading@10: #define PCI_SIZE  980
yading@10: #define DSI_SIZE 1018
yading@10: 
yading@10: /* parser definition */
yading@10: typedef struct DVDNavParseContext {
yading@10:     uint32_t     lba;
yading@10:     uint8_t      buffer[PCI_SIZE+DSI_SIZE];
yading@10:     int          copied;
yading@10: } DVDNavParseContext;
yading@10: 
yading@10: static av_cold int dvd_nav_parse_init(AVCodecParserContext *s)
yading@10: {
yading@10:     DVDNavParseContext *pc = s->priv_data;
yading@10: 
yading@10:     pc->lba    = 0xFFFFFFFF;
yading@10:     pc->copied = 0;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int dvd_nav_parse(AVCodecParserContext *s,
yading@10:                          AVCodecContext *avctx,
yading@10:                          const uint8_t **poutbuf, int *poutbuf_size,
yading@10:                          const uint8_t *buf, int buf_size)
yading@10: {
yading@10:     DVDNavParseContext *pc1 = s->priv_data;
yading@10:     int lastPacket          = 0;
yading@10:     int valid               = 0;
yading@10: 
yading@10:     s->pict_type = AV_PICTURE_TYPE_NONE;
yading@10: 
yading@10:     avctx->time_base.num = 1;
yading@10:     avctx->time_base.den = 90000;
yading@10: 
yading@10:     if (buf && buf_size) {
yading@10:         switch(buf[0]) {
yading@10:             case 0x00:
yading@10:                 if (buf_size == PCI_SIZE) {
yading@10:                     /* PCI */
yading@10:                     uint32_t lba      = AV_RB32(&buf[0x01]);
yading@10:                     uint32_t startpts = AV_RB32(&buf[0x0D]);
yading@10:                     uint32_t endpts   = AV_RB32(&buf[0x11]);
yading@10: 
yading@10:                     if (endpts > startpts) {
yading@10:                         pc1->lba    = lba;
yading@10:                         s->pts      = (int64_t)startpts;
yading@10:                         s->duration = endpts - startpts;
yading@10: 
yading@10:                         memcpy(pc1->buffer, buf, PCI_SIZE);
yading@10:                         pc1->copied = PCI_SIZE;
yading@10:                         valid       = 1;
yading@10:                     }
yading@10:                 }
yading@10:                 break;
yading@10: 
yading@10:             case 0x01:
yading@10:                 if ((buf_size == DSI_SIZE) && (pc1->copied == PCI_SIZE)) {
yading@10:                     /* DSI */
yading@10:                     uint32_t lba = AV_RB32(&buf[0x05]);
yading@10: 
yading@10:                     if (lba == pc1->lba) {
yading@10:                         memcpy(pc1->buffer + pc1->copied, buf, DSI_SIZE);
yading@10:                         lastPacket  = 1;
yading@10:                         valid       = 1;
yading@10:                     }
yading@10:                 }
yading@10:                 break;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (!valid || lastPacket) {
yading@10:         pc1->copied = 0;
yading@10:         pc1->lba    = 0xFFFFFFFF;
yading@10:     }
yading@10: 
yading@10:     if (lastPacket) {
yading@10:         *poutbuf      = pc1->buffer;
yading@10:         *poutbuf_size = sizeof(pc1->buffer);
yading@10:     } else {
yading@10:         *poutbuf      = NULL;
yading@10:         *poutbuf_size = 0;
yading@10:     }
yading@10: 
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: AVCodecParser ff_dvd_nav_parser = {
yading@10:     .codec_ids      = { AV_CODEC_ID_DVD_NAV },
yading@10:     .priv_data_size = sizeof(DVDNavParseContext),
yading@10:     .parser_init    = dvd_nav_parse_init,
yading@10:     .parser_parse   = dvd_nav_parse,
yading@10: };