audio digitization

MediaPlayer wake-up lockGenerally, MediaPlayer is used to play audio streams. We recommend that you use a Service to carry MediaPlayer instead of directly using it in the Activity. However, in the Android system's power consumption design, to save battery consumption, if the device is in sleep state, the system will try to reduce or disable some features that are not required by the device, including the CPU and Wifi hardware. Then, if it is an applic

*************************************************************************************************************** ************Easywave Time: 2014.10.25Category: Linux application-alsa audio architecture Alsa-lib porting to compilation declaration: reprint, please keep the linkNote: If there is an error, please correct me. These are the journal articles I studied ...*****************************************************************************************

Introduction to various management---audio management: Audio management classes for more audio, more categories of items, often the main process to write, so that the programmer can directly find the audio clips want to play, although slightly complex, but easy to organize and later add, if a project in the late reques

ALSA is a late audio processing library in Linux, mainly for improvements to the existing OSS libraries. Better performance, support for multiple playback sources, and so on. But correspondingly, increased programming complexity.The old OSS is a standard file IO interface, the device is opened with open, the audio recording is the data IO interface (read/write), the parameters of the device are controlled b

ALSA is a relatively late audio processing library in Linux, mainly for the original OSS library to improve. Better performance, support for multiple playback sources, etc. but correspondingly, the complexity of programming is increased.The old OSS is the standard file IO interface, the device opens with open, the audio broadcast is using the Data IO Interface (read/write), the parameters of the device are

Audio and video storage using the MPEG4IP library interface Mp4writesample Write-Audio Video frame (requires precise control of timestamp, time stamp can use relative value, that is, the current frame timestamp minus the timestamp of the previous frame) Mp4addh264videotrack adding H264 Track (timescale time factor parameter is important, based on the timestamp type definition of the video frame, 90000 (vid

As the current mainstream media playback software, Storm audio and video is almost household name. Version of the constant update so that the storm audio and video has more and more new features, so it is very convenient to grasp some skills to quickly operate. The latest launch of the Storm audio and video V2.9 Beta has a lot of practical new features, and hidde

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

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

#include #include#include#include#include#include#include/*The following three parameters are related to a specific file * cmd:file audio file * [file Pass.wav] =>> Pass.wav:RIFF (Little-endian) data, WAVE Audio, Microso FT PCM, + bit, mono 44100 Hz * 1. 16-bit * 2. Mono for the channel =1, stereo for stereo = 2 * 3. 44100HZ frequency This is what we all know, and the number of bits to capture or play

　Windows7 Audio Service not running solution Workaround 1, Windows7 "Audio service is not running", there is a red fork to do? User tips simple approach: Point small speaker, the volume to the maximum Workaround 2, Windows7 Audio service failed to start you can open the Management tool for Control Panel, open the list of services, select the Windows

How does the WIN8 system set up the audio manager? Win8 Set the Audio Manager method: 1, the first speaker audio cable unplug, temporarily not connected, in the Control Panel to open the hardware and voice button, click on the audio manager; 2, plug in the speaker audio