Long time not updated blog, from the company resigned years ago, this six months, has been to do some outsourcing app to feed themselves! is also to achieve their own years ago set goals! But also think that can not always do outsourcing it, so decided to do some of their own feel interesting app, hang to the App Store and Ap
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
other factors, the resulting audio files may have a certain degree of distortion, in addition, audio and video codec can be done by pure software, but also by the use of specialized hardware chip to complete.
Playback process
Remove the relevant files from the storage device and decode them according to the encoding used in the recording process.
The
Go from Android 4.1 audio system Change instructions to Android 4.1, English code abbreviation for JB. In the eyes of the Chinese people, the word jb is also a little related to animals. Google so frequently modified Android, finally launched a can be all day jb JB hanging in the mouth of the version. Later my article
MediaRecord can be used for recording in Android, which is easy to operate. However, it is not professional enough to Process audio. If you want to process audio in real time or encapsulate the audio
You can use AudioRecord for recording.
Here is a piece of code. Audio Rec
codec can be completed by pure software, you can also use dedicated hardware chips. Playback Process
Extract related files from the storage device and perform Decoding Based on the encoding method used in the recording process. The audio system selects the final matching audio playback device for the playback instance. The decoded data is transmitted through the path designed by the
process, complete MP4 parsing, audio and video decoding, playback and rendering11. Learn more about OpenGL to learn how to achieve clip, rotate, watermark, filter, and learn OpenGL advanced features such as VBO,VAO,FBO, etc.12. Learn Android graphics image architecture and be able to use GLSURFACEVIW to draw Camera preview screen13. In-depth study of audio and v
that the resources it occupies are released: mediaPlayer. release (); it should be a good practice to perform this operation before dropping an instance. If you have not set MediaPlayer to a loop and the playback has ended, you can restart MediaPlayer through the MediaPlayer. prepare () and MediaPlayer. start () methods. Most of these methods are asynchronous. Therefore, when MediaPlayer. stop () is called, The MediaPlayer. isPlaying () method may take some time to return. Write a test activity
scenario where Audiofocus is preempted and retrieved:Audio focus is preempted and re-acquired time series diagramNote : for the sake of simplicity, this figure, in addition to the two competing audio focus apps, only uses Audiomanager to characterize the objects inside the Android Audiofocus mechanism, The actual audiomanager is only the external representation, the internal participation of many objects,
, intentfilter );Sendbroadcast (new intent (intent. action_media_mounted,Uri. parse ("file ://"+ Environment. getexternalstoragedirectory (). Getabsolutepath ())));}}
Send broadcast information by clicking the button, and then scan the audio information through the broadcast service.
The following is the broadcast service code:
Package com. ZTE. broadcastreceivermediascanner;
Import Android.
.
Porting the FFmpeg library to the Android platform, combining the experience gained above, to write a simple audio and video player
Porting the x264 library to the Android platform, combined with the above experience, to complete the video data H264 soft editing function
Porting the Librtmp library to the Androi
Android audio and video goes deep into an AudioRecord recording to generate pcm into wav (with source code download), androidaudiorecord
This project address is named AudioRecord recording (can be paused, convert pch to wav ).Https://github.com/979451341/Audio-and-video-learning-materialsHere is an official description1. AndioRecord Overview
The main function of
use infrared remote control for a moment, but you cannot find the remote control. In addition, I have developed the audio port extension header, insert it into the ear port of your Android phone and install a special app. You can use it to remotely control any electrical appliance with the infrared remote control function in your home!
You can also leave the mon
The project needs to get the real-time volume value of the video playback, the simplest way is to listen to the audio output, get the audio output stream, and then convert.When investigating, first find this blog:http://blog.csdn.net/jinzhuojun/article/details/33748031The output stream data is recorded in real time using the newly added MediaRecorder.AudioSource.REMOTE_SUBMIX parameter in API 19.Because you
This project address, name is Audiorecord recording (can pause, convert PCH to WAV), for starHttps://github.com/979451341/Audio-and-video-learning-materialsFirst, the official description.1.AndioRecord Approximate descriptionThe main function of the Andiorecord class is to enable various Java applications to manage audio resources so that they can record sound co
During the first Android development, I realized such profound version differences for the first time.
My audiorecordCodeThe test was successful at Samsung s5670.
Xiaomi, duowei d210t test failed. The error message is as follows:
04-01 12:58:44. 368: E/audiorecord (19808): cocould not get audio input for record source 1
04-01 12:58:44. 368: E/aud
Today, any smart phone can play audio. Of course, android-based devices are no exception. They allow you to create music players, audio books, podcasts, or any other applications that play around audio. In this article, we will discuss Android's functions in terms of format and decoder support, as well as several diffe
Whether it is text, image or sound, must be organized and stored in a certain format, so that the player will know how to parse this piece of data, for example, for the original image data, our common format is YUV, Bitmap, and for audio, the simplest common format is the WAV format.WAV format, like bitmap, are Microsoft developed a file format specification, they all have a similarity, is the whole file is divided into two parts, the first part is "F
IOS and Android audio Development Summary
Recently, because the project needs to change the sound, it is not difficult to learn and Process audio. However, it is still tedious (more than expected)
While my mind is still excited, I will summarize my thoughts and record them.
This article mainly introduces three parts:
1
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