This section describes how to program TV cards in Linux.
As mentioned at the beginning, video
Linux driver, v4l for short. In fact, the video for Linux Two driver is now available.
V4l2 solves some problems in v4l and improves hardware performance. However, v4l2 is still not integrated into the Linux kernel. To use v4l
In fact, it has been a long time to explore the problem of network card packet capture. I found some basic things in the last few days. I will just repeat them here.
Packet Capture first needs to know that the data transmitted through the NIC is actually through the underlying link layer (MAC). in Linux, the data traff
Listen to the voice of freedom----installation and configuration of sound card driver software Alsa under Linux
Recommendation: yy810310 Published: December 9, 2000 read times: 294
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For several years, Linux's multimedia features have not been very satisfying as a desktop software, despite its openness, free features and strong
. This firewall must implement full-process dynamic packet filtering in Linux, by analyzing the address, protocol, and port of the data packet, you can control the access to the current status of any network connection to improve system performance and security. 2) provide log auditing. This firewall is equipped with a logging system and query tools to record system management, system access, and network access to security policies. 3) Firewall Databa
Installation and configuration of the Sound Card Driver Software ALSA in Linux
2000-11-23
Publisher: netbull read count: 5585
LinuxByte note: the latest ALSA version is available on this site.
Zhang Zi
Over the past few years, although Linux has been invincible in the global server market due to its open and free features and powerful performance, it has occupie
For several years, Linux's multimedia features have not been very satisfying as a desktop software, despite its openness, free features and strong performance, which have been overwhelming in the global server market and are gaining market share. For example, a Linux system with its own sound card driver can support very few sound cards. Most of the popular sound card
Structure and Principle Analysis of the packet capture module based on Linux-Linux Enterprise Application-Linux server application information. The following is a detailed description. This section discusses the structural features of the monitoring layer data packet capture
Tcpdump is a common use of the Linux command to grab a package tool, record the usual way, test machine system is Ubuntu 12.04.Tcpdump's command formatTcpdump parameters are numerous, through the man tcpdump can see the detailed description of tcpdump, this side only some of the author's own commonly used parameters:tcpdump [-I nic]-nnax ' expression 'The parameters are described as follows:
-i:interface monitor the network
the static acquisition of IP2. Check the configuration of the Eth0 network card to verify the success of joining the 207 lab subnet.3. Scan hosts in 207 Labs (TCP SYN semi-connection mode)4. To analyze the host 222.26.28.73, intuitive judgment for the Linux systemTo analyze the host 222.26.28.122, visually determine the Microsoft systemTo analyze the host 222.26.28.228, it is not intuitive to judge that no
Original article link
Tcpdump is a tool used to intercept network groups and output group content. It is simply a packet capture tool. Tcpdump is the preferred tool for Network Analysis and troubleshooting in Linux based on its powerful functions and flexible interception policies.
Tcpdump providesSource codeOpen interfaces, which are highly scalable and useful for network maintenance and intruders. Tcp
Installation and configuration of sound card driver software Alsa under Linux
2000-11-23 7:00
Published by: Netbull read times: 5585
Linuxbyte Note: This site has the latest version of Alsa download
Chamberlain
For several years, Linux's multimedia features have not been very satisfying as a desktop software, despite its openness, free features and strong performance, which have been overwhelming
(CPU execution
Time), the proportion of time spent by the three is about 250: 30: 1, which is based on the packet size of bytes.
The larger the ratio of the three, the longer the transmission (or receipt) and DMA packets are the time bottlenecks.
During interrupt processing, it takes a little longer to "New packets arrive" than "packet transfer completed.
Keywords:
Linux, Protocol driver, network card driv
After Linux Kernel 3.12 came out, I had been eager to try. However, after installation, I was unable to start the graphical interface. The reason was that the NVIDIA graphics card of my small broken PC used its private driver and the build failed during installation.
The company's computers do not have private video card drivers, but they were installed more than
operations such as mixer.
The creation process of the control device is basically the same as that of the PCM device. For detailed creation process, refer to another article in this blog: Linux audio driver 3: Creating PCM devices. Here we will only discuss the differences.
We need to call the snd_pcm_new () function to create the PCM device during driver initialization, while the control device is created in snd_card_create (). snd_card_create ()
TLV, which is the meaning of Type-lenght-value, the No. 0 element of the array represents the type of data, the 1th element represents the length of the data, the third element and the subsequent element hold the variable's data.Establishment of control devicesThe control device, like the PCM device, belongs to the logical device under the sound card. The application of user space accesses the control device through Alsa-lib, reads or controls the co
The raspberry pi system installs Linux and raspberrypi on the SD card.
I just got a raspberry pi borrowed by Simon and prepared a 4 GB SD card for Linux.
On Windows 7, use the tool Win32DiskImager to write img to the SD card. An error is returned and an error is returned.
F
-2.6.16.15.tar.bz2
Music linux-2.6.15.4.tar.bz2/usr/src
Cd/usr/src
Tar-jxvf linux-2.6.16.15.tar.bz2
Cd linux-2.6.16.15
Make xconfig
Configure the kernel
Device Drivers --> Multimedia devices --> Video For Linux --> BT848 Video For Linux (module)
Device Drivers --> Digital Vi
snd_soc_register_dais in the probe callback of the corresponding platform_driver;
Implement probe, suspend, and other callbacks in the snd_soc_dai_driver structure;
Implement the callback function in the snd_soc_dai_driver field in the snd_soc_dai_ops structure;
Snd_soc_register_daiThis function has been introduced in the previous article about the codec driver. For details, refer to: Linux
ALSA sound card
devices. This series of blog posts only discuss ALSA-driver and ALSA-SOC in embedded systems. Ii. ALSA device file structure
Let's start our ALSA journey from the device file structure of ALSA in Linux. Let's take a look at the structure of the device file of the Alsa driver in my computer:
$ CD/dev/SND$ LS-l
CrW-RW ---- + 1 root audio 116, 8 controlc0CrW-RW ---- + 1 root audio 116, 4 midic0d0CrW-RW ---- + 1 root audio 116, 7 pcmc0d0cCrW-RW ----
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