问题:

I need your help for the below query:

Query: Is there any way of getting following info of an audio file. Sample rate, Channel, Bitrate of an audio file.

For extracting bitrate, "MediaMetadataRetriever" API is available (METADATA_KEY_BITRATE).

Please suggest if it can be done using any android API.

Found this below API, But its use is actually in different. http://developer.android.com/reference/android/medi/AudioTrack.html

I want to extract these using Android API programmactically : Sampling rate, Quantization, Channel of an input audio file.

Please help on this.

Thanks in advance.

回答1:

Use MediaPlayer.getTrackInfo() during playback (after METADATE_UPDATE event come to onInfo callback) to obtain MediaFormat object by invoke getFormat for audio stream track. And then from MediaFormat you can get:

BIT_RATE

CHANNEL_COUNT

SAMPLE_RATE

回答2:

This can be done using MeiaExtractor like this:

MediaExtractor mex = new MediaExtractor();
    try {
        mex.setDataSource(path);// the adresss location of the sound on sdcard.
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    MediaFormat mf = mex.getTrackFormat(0);

    int bitRate = mf.getInteger(MediaFormat.KEY_BIT_RATE);
    int sampleRate = mf.getInteger(MediaFormat.KEY_SAMPLE_RATE);
    int channelCount = mf.getInteger(MediaFormat.KEY_CHANNEL_COUNT);