I'm trying to use the AudioRecord class to record a WAV file. The problem is that it only supplies the raw PCM data, and if I write it to a file, there is no header information, so it will not play in any media player. How can I create a WAV file from this raw data?
Or alternatively, is there any other way to record sound in Android to a WAV file (or, alternatively MP3)?
Oh, and I know that MediaRecorder can'y be used because it doesn't support either WAV or MP3 formats.
OK, I've got this figured out. This post was crucial in helping me:
http://computermusicblog.com/blog/2008/08/29/reading-and-writing-wav-files-in-java
Basically, I used ByteArrayOutputStream to write the raw PCM data from AudioRecord, which then lets me get the byte array and its size when the process is done. I can then use that data in conjunction with the SampleRate, BitRate, and Stereo/Mono settings to create the WAV header as per the link above. The resulting file works perfectly!
Check the MediaRecorder.setOutputFormat(), you can set different container formats for your recording; there is MediaRecorder.OutputFormat.MPEG_4 and MediaRecorder.OutputFormat.THREE_GPP; the only allowed format along RAW is setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
Sorry but MP3 is not avail. You really need mp3 for recording?
WAV on the opposite of MP3 is a container, not a format; WAV can be any kind of encoding format.
You are always free to prepend some WAV RIFF header in front of your raw pcm data (as long as you exactly know the format). Check here for how it has to look like:
http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/WAVE.html
You may want to use mediarecord class
Related
I am able to convert the .amr file to the .wav file by adding the required header info to the newly created file i.e. example.wav file, but unable to convert the .flac file to .wav file properly however I get the .wav file which plays for the same time for which it was recorded but plays the noise sound as bad Channel signal on Radio instead of recorded voice. Please help me to fix this issue. Thanks
Both the files have been written data in different format so only copying the headers is not the solution, you will have to do proper decoding from flac to pcm and then will have to add headers and store the bytes from pcm to wav file.
Is there a file container that can store GSM-EFR speech data?
Just now I have such an file that contains a lot of RTP packages, the payload type of RTP package is GSM-EFR. I want to convert this file to a file that store the GSM-EFR data.
And then I need a audio player to decode the file and play the voice.
I have try the .amr file format,but encounter that .amr format can not distinguish the full rate and enhance full rate when they are both 12.2kbps.
I have try the ffmpeg, but this player can not decode GSM-EFR data.
So I need a file format and a audio player.Is there anyone can help me?
Thanks very much!
GSM-EFR is same like AMR mode 7. Try packet your RTP payloads to AMR storage file with amr header mode 7. And be carefully, because in RTP payload can be signature 4 bit (0xC) in beginning, if have, you need delete at beginning 4 bit befor packing to AMR file
I have some audio data (raw uncompressed audio waveform, no file format) in memory and want to replay it. Android-internal Mediaplayer seems to support only replaying of files stored somewhere on disk, I could not find a setDataSource()-method that would accept an array of data instead of a path/URL.
So how can I replay waveforms that are not stored on disk?
Thanks!
Use an AudioTrack. See e.g. this page for an example of how to set up an use an AudioTrack (jump to the "Playing the sample with an AudioTrack" section, and just ignore the JNI-stuff).
I have a bytearray that holds an wav audio stream.
Is there a way on android system to convert the wav file to a flac file?
I found some example code from FlacEncoder library but this library assumes as far as I see the use of some audio classes from javax.
These are not available on android.
Is there some other library or some example code for android?
Thanks!
There seem to be a lot of questions regarding the inverse wav to mp3 conversion, but none to go the other way. My situation is that I can use steganography to embed data in wav files. I can convert these to ogg and back (the steganography is format independent, and can survive format conversion). What I want to do now is build in AudioBoo integration. Uploading to AudioBoo is not a problem, retrieving the files in mp3 format is not a problem, but converting those mp3 files back to wav to perform the steg. extraction is. Does anyone know where I should start?
Check out JLayer. It should run on Android. Beware, some of the calls are synchronized. If this doesn't work, tweak the source code or extract the converter modules from the entire source, since all you need is the mp3 to wav converter, not the mp3 player.