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Transferred from: http://tieba.baidu.com/p/2138076570Abstract: In order to solve the problem of audio and video synchronization caused by delay, jitter and network transmission conditions, a new audio and video synchronization scheme is designed and implemented to adapt to different network conditions. Using the audio and video coding technology, AMR-WB and H. e

Audio, English, or you might see an audio output or input on the back panel of a VCR or VCD. This allows us to interpret the audio in a very popular way, as long as it is a sound that we can hear and transmit as an audio signal. For the physical properties of audio because i

Payload type (PT) Name Type No. of channels Clock rate (HZ) Description References 0 PCMU Audio 1 8000 ITU-T g.711 PCMMicro-Law audio 64 kbit/s RFC 3551 1 Reserved (previolet 1016) Audio 1 8000 Reserved, previuslyCELP audio 4.8 kbit/s RFC 3551, pre

(This article transferred from the Code farm Life )ObjectiveMusic-related app development has been for some time, in the process of the app's player after several changes, I also for iOS audio playback implementation has a certain research.Write this series of blog purpose on the one hand hope to be able to stimulate, on the other hand is also hope to help other iOS developers and enthusiasts less detours (I have encountered a lot of pits). This artic

1. Avaudiosession OverviewThe last year has been doing iOS client development for IPC camera. To deal with audio, you have to figure outAvaudiosession.First look at the Apple's official map:Audio SessionYou can see that avaudiosession is used to manage the resource usage of multiple apps on audio hardware devices (microphones, speakers).For example, avaudiosession can do these things. Set whether y

Audioqueue Introduction Audiostreamer description Audioqueue detailed Audioqueue Working principle Audioqueue Main interface Audioqueuenewoutput Audioqueueallocatebuffer Audioqueueenqueuebuffer Audioqueuestart Pause Stop Flush Reset Dispose Audioqueuefreebuffer Audioqueuegetproperty Audioqueuesetproperty Audio playback Localaudioplayer Initialization

In scenes where audio and video are re-encoded and need to be synchronized, there are several basic principles to follow (otherwise the audio and video will be stuck and not smooth.) With audio AAC encoding frequency 44.1k, video H264 encode 25 frame rate for example): 1. Ensure that the audio and video frame arrival

There are many articles that describe the poor status of HTML5 audio support. That is the case, so I will not repeat this view here. Instead, I focus on the issues and potential solutions that developers will encounter on a particular platform.HTML5 Audio from Codecanyon.neTableThe above table summarizes the current market share of Web browsers. Internet Explorer is still the main desktop browser, followed

on experience, PlaySound () applies to files below 100K.MCI (The Media Control Interface), similar to playing MIDI files in the previous chapter, can play more than 100K of files.Low-level wave audio devices. Use these devices to run application files that completely control wave data.Second, WAV file playback controlBecause MCI is also used, the same as in the previous chapter, only the different parts are listed.1. Turn on the deviceChange MIDI's m

lithium-ion battery as the power supply. During the hibernation period, the power supply of all non-working units is turned off for energy saving. A power management unit controlled by RTC (Real-time clock) allocates and manages all levels of power supply. After the system is powered on, the Power Supply Management Unit is set to valid, and the CPU sets the RTC wake-up time. After the work is completed, the CPU closes the power supply management unit output, at this time, only the RTC and power

XAudio2 Learning three get output device informationThe output device information includes the audio format supported by the output device, the device ID, the device name, and the role. Audio format: Number of channels, sample rate, valid bit, audio type, and so on. Device ID: Unique identification for each device, pla

In previous versions of HTML5, if you wanted to insert audio and video into a webpage, you would have to install a plugin, such as the most common flash plugin. A lot of people in the first installation of a browser will encounter the browser is recommended to install Flash plugin, on the mobile side as well. If you want to watch video on the phone must install Flash plug-in, but the phone itself memory is very small this undoubtedly increased the mob

. privatefunctionrtmfpTimeoutHandler(e:TimerEvent):void { isRTMFP=false; rtmfpTimer.stop(); rtmfpTimer=null; nc.close(); connect(true); } Add the code to the ncStatusHandler function of the original Netconnection connection status listener: if(rtmfpTimer) { rtmfpTimer.stop(); rtmfpTimer=null; } In this way, when the Netconnection connection responds, close the counter. At this point, we have changed the client connection to a P2P-compatible RTMFP connection me

, and when the name of the platform driver and platform device (previously configured in DT) wants to match, it invokes the probe function s3c24xx_uda134x_probe in the platform driver. S3c24xx_uda134x_snd_device = Platform_device_alloc ("Soc-audio",-1); if (!s3c24xx_uda134x_snd_device) { printk (kern_err "s3c24xx_uda134x SoC Audio:" "unable to register\n"); Return-enomem; } Platform_set_

Linux Audio Programming GuideAlthough the advantages of Linux are mainly embodied in the network services, but in fact, there is also a very rich media function, this article is based on multimedia applications of the most basic sound as an object, how to develop the actual audio applications under the Linux platform, and also some common audio programming framew

(): Determines whether music is active. IsWiredHeadsetOn(): Determine whether the headset is inserted Other methods: AbandonAudioFocus(AudioManager. OnAudioFocusChangeListenerl): discard audio focus AdjustSuggestedStreamVolume(Int, int suggestedStreamType intflags ): Adjust the volume of the most relevant stream, or specify the rollback stream. GetParameters(String keys): Set a varavisible value for the aud