pcm

I am trying to play the pcm data from NSInputStream. Can anyone provide me the right approach or code to do so. I got the Audio in StreamHasData event with following code. uint8_t bytes[self.audioStreamReadMaxLength]; UInt32 length = [audioStream readData:bytes maxLength:self.audioStreamReadMaxLength]; Now how can i play bytes audio data in iphone? I worked on a similar problem, and I in the end solved it. Here is the basic of what I did. I am using a library for the sockets The below class is responsible for getting the audio and making it available to connected clients. #import <Foundation

I am trying to access the raw data for an audio file on the iPhone/iPad. I have the following code which is a basic start down the path I need. However I am stumped at what to do once I have an AudioBuffer. AVAssetReader *assetReader = [AVAssetReader assetReaderWithAsset:urlAsset error:nil]; AVAssetReaderTrackOutput *assetReaderOutput = [AVAssetReaderTrackOutput assetReaderTrackOutputWithTrack:[[urlAsset tracks] objectAtIndex:0] outputSettings:nil]; [assetReader addOutput:assetReaderOutput]; [assetReader startReading]; CMSampleBufferRef ref; NSArray *outputs = assetReader.outputs;

I am currently developing an Android Application that has audio recording and playing. I am new to dealing with audio and I'm having some trouble with encoding and formats. I am able to record and play the audio in my application, but when exporting I am not able to reproduce the audio. The only way I found was exporting my .pcm file and converting using Audacity. This is my code to record the audio is: private Thread recordingThread private AudioRecord mRecorder; private boolean isRecording = false; private void startRecording() { mRecorder = new AudioRecord(MediaRecorder.AudioSource.MIC,

转载: http://www.voidcn.com/relative/p-fwdkigvh-bro.html pcm 文件存储的是 原始的声音波型二进制流，没有文件头。 （1）首先要确认 pcm文件的每个采样数据 采样位数，一般为8bit或16bit。 （2）然后确定是双声道还是单声道，双声道是两个声道的数据交互排列，需要单独提取出每个声道的数据。 （3）然后确定有没有符号位，如采样点位16bit有符号位的的范围为-32768~32767 （4）确定当前操作系统的内存方式是大端，还是小端存储。具体看http://blog.csdn.net/u013378306/article/details/78904238 （5）根据以上四条对pcm文件进行解析，转化为10进制文件 注意：对于1-3可以在windows使用cooledit 工具设置参数播放pcm文件来确定具体参数，也可以使用以下java代码进行测试： 本例子的语音为： 静默1秒，然后说 “你好”，然后静默两秒。pcm文件下载路径：http://download.csdn.net/download/u013378306/10175068 package test; import java.io.File; import java.io.FileInputStream; import java.io

【文章内容属于多方转载内容】 PCM Parameters PCM audio is coded using a combination of various parameters. Resolution/Sample Size This parameter specifies the amount of data used to represent each discrete amplitude sample. The most common values are 8 bits (1 byte), which gives a range of 256 amplitude steps, or 16 bits (2 bytes), which gives a range of 65536 amplitude steps. Other sizes, such as 12, 20, and 24 bits, are occasionally seen. Some king-sized formats even opt for 32 and 64 bits per sample. Byte Order When more than one byte is used to represent a PCM sample, the byte order (big endian vs.

I have pcm audio stored in a byte array. It is 16 bits per sample. I want to make it 8 bit per sample audio. Can anyone suggest a good algorithm to do that? I haven't mentioned the bitrate because I think it isn't important for the algorithm - right? I can't see right now why it's not enough to just take the upper byte, i.e. discard the lower 8 bits of each sample. That of course assumes that the samples are linear; if they're not then maybe you need to do something to linearize them before dropping bits. short sixteenBit = 0xfeed; byte eightBit = sixteenBit >> 8; // eightBit is now 0xfe. As

I have a .wav file. I want to get the PCM data from that sound file, so that I can get the individual data chunks from the sound and process it. But I don't know how to do it. Can anyone tell me how to do it? I have done this so far: public class test { static int frameSample; static int timeofFrame; static int N; static int runTimes; static int bps; static int channels; static double times; static int bufSize; static int frameSize; static int frameRate; static long length; public static void main(String[] args) { try { AudioInputStream ais = AudioSystem.getAudioInputStream(new File("music