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117 lines
3.4 KiB
117 lines
3.4 KiB
12 years ago
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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 "dsputil.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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if (buf && buf_size) {
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switch(buf[0]) {
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case 0x00:
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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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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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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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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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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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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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};
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