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That's all there is to it!
NEWS 0 → 100644
View file @ 7df0919c
Changes for 0.0.1:
----------------------------
Initial release of libndi
README.md 0 → 100644
View file @ 7df0919c
# libNDI
**NDI is fun, let's use it!**
**libNDI** is a new **NDI** cross-platform, open-source library done to interact with NDI streams.
The canonical repository URL for this repo is https://code.videolan.org/jbk/libndi
# Goal and Features
The goal of this project is to provide a way to interact with NDI streams, without requiring to use a non-open-source SDK, and targetting numerous platforms.
## License
**libNDI** is released under the LGPL, like most other VideoLAN projects.
# Legality
This **libNDI** library was produced using some reverse-engineering that is allowed by the French law, in the case of interoperability.
En France, la directive européenne *91/250/CEE* a été transposée par la loi *n° 94-361 du 10 mai 1994* et le terme interopérabilité, mentionné à l'article *L. 122-6-1*
du **Code de la propriété intellectuelle**.
Il est notamment écrit à l ’article *L. 122-6-1, III*, du **Code de la propriété intellectuelle**, rédigé de la
manière suivante : « la personne ayant le droit d’utiliser le logiciel peut sans l’autorisation de l’auteur
observer, étudier ou tester le fonctionnement de ce logiciel afin de déterminer les idées et principes qui sont
à la base de n’importe quel élément du logiciel lorsqu’elle effectue toute opération de chargement,
d’affichage, d’exécution, de transmission ou de stockage du logiciel qu’elle est en droit d’effectuer ».
Il est aussi écrit, à l ’article *L. 122-6-1, IV*, du **Code de la propriété intellectuelle** :
« IV. La reproduction du code du logiciel ou la traduction de la forme de ce code n’est pas soumise à
l’autorisation de l’auteur lorsque la reproduction ou la traduction au sens du
1° ou du 2° de l’article L. 122-6 est indispensable pour obtenir les
informations nécessaires à l’interopérabilité d’un logiciel créé de façon indépendante avec d’autres logiciels ».
There is no limitation of distributing this information to third parties, in other countries
# Contribute
## CoC
The [VideoLAN Code of Conduct](https://wiki.videolan.org/CoC) applies to this project.
## TODO
- Remove libavutil dependency (av_fifo_\*)
- Fuzzing
libndi.c 0 → 100755
View file @ 7df0919c
/*
libndi
Copyright (C) 2020 VideoLAN
This library 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.
This library 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 this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define _POSIX_C_SOURCE 200809L
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <inttypes.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <poll.h>
#include <libavutil/common.h>
#include <libavutil/frame.h>
#include <libavutil/fifo.h>
#include "libndi.h"
uint8_t ndi_xortab[] = {
0x4e, 0x44, 0x49, 0xae, 0x2c, 0x20, 0xa9, 0x32, 0x30, 0x31, 0x37, 0x20,
0x4e, 0x65, 0x77, 0x54, 0x65, 0x6b, 0x2c, 0x20, 0x50, 0x72, 0x6f, 0x70,
0x72, 0x69, 0x65, 0x74, 0x79, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x43, 0x6f,
0x6e, 0x66, 0x69, 0x64, 0x65, 0x6e, 0x74, 0x69, 0x61, 0x6c, 0x2e, 0x20,
0x59, 0x6f, 0x75, 0x20, 0x61, 0x72, 0x65, 0x20, 0x69, 0x6e, 0x20, 0x76,
0x69, 0x6f, 0x6c, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x6f, 0x66, 0x20,
0x74, 0x68, 0x65, 0x20, 0x4e, 0x44, 0x49, 0xae, 0x20, 0x53, 0x44, 0x4b,
0x20, 0x6c, 0x69, 0x63, 0x65, 0x6e, 0x73, 0x65, 0x20, 0x61, 0x74, 0x20,
0x68, 0x74, 0x74, 0x70, 0x3a, 0x2f, 0x2f, 0x6e, 0x65, 0x77, 0x2e, 0x74,
0x6b, 0x2f, 0x6e, 0x64, 0x69, 0x73, 0x64, 0x6b, 0x5f, 0x6c, 0x69, 0x63,
0x65, 0x6e, 0x73, 0x65, 0x2f, 0x00, 0x00, 0x00
};
typedef struct ndi_message
{
uint8_t *buf;
int len;
} ndi_message;
struct ndi_ctx
{
/* buffers */
AVFifoBuffer *fifo;
int target_size;
int socket_fd;
ndi_message ndi_request[4];
int pending_requests;
ndi_data_callback callback;
/* options */
char *ip;
char *port;
};
/* Probably could merge scramble and unscramble */
static void ndi_scramble_type1(uint8_t *buf, int len, uint32_t seed)
{
uint64_t seed64 = ((uint64_t)seed << 32) | seed;
uint64_t seed1 = seed64 ^ 0xb711674bd24f4b24ULL;
uint64_t seed2 = seed64 ^ 0xb080d84f1fe3bf44ULL;
if(len > 7) {
uint64_t *buf64 = (uint64_t*)buf;
int qwords = len / 8;
uint64_t tmp1 = seed1;
for(int i = 0; i < qwords; i++) {
seed1 = seed2;
tmp1 ^= (tmp1 << 23);
tmp1 = ((seed1 >> 9 ^ tmp1) >> 17) ^ tmp1 ^ seed1;
seed2 = tmp1 ^ buf64[i];
buf64[i] ^= tmp1 + seed1;
tmp1 = seed1;
}