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Part of this article refers to the blog from Droidphone (http://blog.csdn.net/droidphone/article/details/6271122), about Alsa writing a very good article, just a few examples. This article is a combination of examples to analyze the ALSA audio driver.Development environment: ubuntu10.04Target board: linux-2.6.37 (view Linux kernel information via command uname-r)Compiler: arm-none-linux-gnueabi-(None on behalf of compiler creator, such as: FSL for Fre
Http://blog.csdn.net/dinggo/archive/2007/12/29/2002298.aspx AMR Audio Codec Table of Contents 1. Overview 2. AMR Code 3. AMR decoding 4. AMR frame reading algorithm 5. Resources 1. Overview Many smartphones now support multimedia features, especially audio and video playback, and the AMR file format is a widely supported audio file format for mobile phones. A
As the most well-known media player software in China, Storm audio and video has been in the market in 08 and is dedicated to creating a complete video playback platform for 150 million users. In this platform, not only the continuation of the Storm audio and video to the user's local storage environment of all kinds of audio and visual files of the universal pla
From: http://book.51cto.com/art/201001/179672.htm Chapter 2Android audio system This chapter introduces the content of the android audio system, which is mainly the audio input/output link and does not involve codec content (the audio system has content from the driver, local framework to Java framework ). This chapt
Audio Processing in WINDOWS In WINDOWS, audio processing can be roughly divided into two parts: audio input and output, and ACM compression.In WINDOWS, Apis such as sndPlaySound (MCI) can be called to play a WAV file, but this is obviously not what we need to do. You must be able to directly Process audio data stream
In the production of the publishing side, you need to collect the sound card output signal, in order to mix with the microphone input signal, for audio processing technology, mainly the following: Capture Microphone Input Collect sound card output Send audio data to the sound card for playback Mixing multi-channel audio inputs Here are t
016-11-25 DORAWEBRTC series Wind net WEBRTC series Wind Net Source: Wind NET Series Author: Weizhenwei, fan network columnist Audio and video synchronization is the most intuitive user experience for multimedia products, and is the most basic quality guarantee for audio and video media data transmission and rendering playback. If the audio and video is not synchr
Small series of computer just reload Win7 system, found no sound, using Windows7 users will find in the lower right corner of the taskbar in the position of the volume icon shows a small red fork, put the mouse up later to show that the audio service is not running or not plugged into the speakers or headphones. There are two situations in which the "Audio service is not running" but the computer has sound,
1, click the "Insert" tab, click "Video"-"video on PC" To insert a video, the effect of inserting the following image as shown below. 2. After inserting the effect as shown in the following figure, the next step begins to trim the video. 3. Select the video, which will display the video tool (including the format and Playback tabs), click the Play tab, and then click Clip Video. 4, the "Clip Video" dialog box, you can drag the following figure in the circle
1. Import #import 2. Implementation Protocol e.g. @property (nonatomic, strong) Avaudiorecorder *audiorecorder; @property (nonatomic, strong) Avaudioplayer *audioplayer; Path of audio files saved after recording -(Nsurl *) audiorecordingpath{ Nsfilemanager *filemanager = [[Nsfilemanager alloc] init]; Nsurl *documentsfolderurl = [FileManager urlfordirectory:nsdocumentdirectory indomain:nsuserdomainmask Appropriateforurl:nil Create:no Error:nil]; N
This article translated from: http://developer.android.com/training/managing-audio/audio-focus.html It is vital to consider how to interact with multiple potential audio playback programs. To avoid simultaneous playback of each music player, Android uses audio focus to control audi
Reprint Please specify source: http://www.cnblogs.com/fangkm/p/4374668.htmlThe previous blog introduces the local video collection, this article introduces the audio capture process, but also introduces WEBRTC native audio collection, and then introduces chromium source to its customization.1. WebRTC native Audio captureLet's first introduce the interface concept
Android 4.1, abbreviated as JB. In Chinese eyes, the word JB is also related to animals. Google modified android so frequently, and finally launched a version that can be put on the mouth of JB all day long. In the future, my articles can also use JB to express the version number, while JB to express what Chairman Mao often said, "Strategic contempt". Please try to understand my mood for writing the word JB according to the context. Today, we will give a brief introduction to the earth-shaking c
Today, as mobile QQ or MSN enters the mobile phone, mobile users begin to enter the new era of video chat or video conferencing, but due to mobile environments (such as elevators, roads, squares, restaurants, bars, trains, and automobiles) mobile phone users are increasingly eager for HD Audio due to various noisy noises or interference. This is why HD Audio has already ranked first in the mobile phone mark
Transferred from: http://www.cnblogs.com/fangkm/p/4374668.htmlThe previous blog introduces the local video collection, this article introduces the audio capture process, but also introduces WEBRTC native audio collection, and then introduces chromium source to its customization.1. WEBRTC native Audio captureLet's first introduce the interface concepts in WEBRTC t
Web Audio is also a relatively new JavaScript API, which is different from the General Web applications should not fall into these APIs, but some types of web sites such as game engines or online music editors should be used.The Web audio API is tightly wrapped around a conceptual design: audio context, which is like a graph, each node in the way is an
1:7 Mouth 8 TongueSpeakers, headphones, and earpieceIs by: Audiomanager.setmode (audiomanager.mode_in_communication)Audiomanager.setspeakerhponeon (boolean value). These two are set. But some don't seem to support it.Switch speaker and handset on the M phone cannot switchAndroid Audiotrack Audio Playback analysisWhen the audio resource is playing, there are frequent conflicts, such as when the music is play
from the theoretical height of analysis, if you are experiencing problems, through the search engine came here, please directly read the article "Summary", this part of the reference post is basically Ubuntu audio problem Daquan.Now let's take a bottom-up analysis of this problem from the bottom up.First of all, the Linux community is facing the biggest and most realistic status quo, is to get too little support. From the chip level, each OEM has the
The windows7 appears the volume icon displays the small red Fork, appears "The audio service is not running"; Problem description: After using WINDOWS7 users into the system, a red fork appears on the volume icon in the lower-right corner of the taskbar, prompting the "audio service is not running" when the mouse points to the volume icon; In either case, the audio
Computers have long been an indispensable tool around us, whether it is work, learning or entertainment. What should we do if the computer has no sound and prompts to say "No audio device"? The scene screenshot is as follows: "No audio device" hardware article Since the system prompts to say "no audio device", naturally, first of all, is the
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