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FFmpeg/libavcodec/dvd_nav_parser.c
Richard 9cde9f70ab mpeg: Add passing DVD navigation packets (startcode 0x1bf) to caller to allow better playback handling of DVDs.
The two types of packets (PCI and DSI) are passed untouched but combined by the new codec ID AV_CODEC_ID_DVD_NAV.
 The first 980 bytes in the packet contain the PCI data. The next 1018 are the DSI data.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-03-17 16:24:34 +01:00

117 lines
3.4 KiB
C

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