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