How can we know if a WAV file contains Audio or not in Android.
Is there any way in Android to find if a WAV file stored on SD contains audio.
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 am using JCodec for android for encoding an mp4 video starting from a set of images. It works and I obtain an mp4 file. Now, I would like to add an audio trace. Unfortunately, JCodec does not support audio encoding. So, somebody suggest to solve this problem as follows:
"Jcodec doesn't have the capability to encode audio (AAC) so you can encode your audio elsewhere and then add it to you mp4 file."
Any advice on how to "add" the mp3 file to the mp4 file?
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!
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