在Android上编辑wav到AAC

概述您可以使用 MediaRecorder将流直接记录到AAC,但似乎没有办法将现有的PCM / WAV文件编码到AAC.编码到AAC的能力在Android中本身存在,我想使用它.有没有办法用预先存在的音频文件？ 看看这个美丽(和完美的)例子： Mp4ParserSample 看看类的最后一部分(335-442行),转换Runnable对象只是做这个工作！您必须根据需要调整代码,调整输入和输出文件路径 您可以使用 MediaRecorder将流直接记录到AAC,但似乎没有办法将现有的PCM / WAV文件编码到AAC.编码到AAC的能力在AndroID中本身存在,我想使用它.有没有办法用预先存在的音频文件？解决方法 看看这个美丽(和完美的)例子：
Mp4ParserSample

看看类的最后一部分(335-442行),转换Runnable对象只是做这个工作！您必须根据需要调整代码,调整输入和输出文件路径以及转换参数(采样率,比特率等).

public static final String AUdio_RECORDING_file_name = "audio_Capturing-190814-034638.422.wav"; // input PCM filepublic static final String COMpressed_AUdio_file_name = "convertedmp4.m4a"; // Output MP4/M4A filepublic static final String COMpressed_AUdio_file_MIME_TYPE = "audio/mp4a-latm";public static final int COMpressed_AUdio_file_BIT_RATE = 64000; // 64kbpspublic static final int SAMPliNG_RATE = 48000;public static final int BUFFER_SIZE = 48000;public static final int CODEC_TIMEOUT_IN_MS = 5000;String LOGTAG = "CONVERT AUdio";Runnable convert = new Runnable() {    @TargetAPI(Build.VERSION_CODES.JELLY_BEAN_MR2)    @OverrIDe    public voID run() {        androID.os.Process.setThreadPriority(androID.os.Process.THREAD_PRIORITY_BACKGROUND);        try {            String filePath = Environment.getExternalStorageDirectory().getPath() + "/" + AUdio_RECORDING_file_name;            file inputfile = new file(filePath);            fileinputStream fis = new fileinputStream(inputfile);            file outputfile = new file(Environment.getExternalStorageDirectory().getabsolutePath() + "/" + COMpressed_AUdio_file_name);            if (outputfile.exists()) outputfile.delete();            Mediamuxer mux = new Mediamuxer(outputfile.getabsolutePath(),Mediamuxer.OutputFormat.muxer_OUTPUT_MPEG_4);            MediaFormat outputFormat = MediaFormat.createAudioFormat(COMpressed_AUdio_file_MIME_TYPE,SAMPliNG_RATE,1);            outputFormat.setInteger(MediaFormat.KEY_AAC_PROfile,MediaCodecInfo.CodecProfileLevel.AACObjectLC);            outputFormat.setInteger(MediaFormat.KEY_BIT_RATE,COMpressed_AUdio_file_BIT_RATE);            outputFormat.setInteger(MediaFormat.KEY_MAX_input_SIZE,16384);            MediaCodec codec = MediaCodec.createEncoderByType(COMpressed_AUdio_file_MIME_TYPE);            codec.configure(outputFormat,null,MediaCodec.CONfigURE_FLAG_ENCODE);            codec.start();            ByteBuffer[] codecinputBuffers = codec.getinputBuffers(); // Note: Array of buffers            ByteBuffer[] codecOutputBuffers = codec.getoutputBuffers();            MediaCodec.BufferInfo outBuffInfo = new MediaCodec.BufferInfo();            byte[] tempBuffer = new byte[BUFFER_SIZE];            boolean hasMoreData = true;            double presentationTimeUs = 0;            int audioTrackIDx = 0;            int totalBytesRead = 0;            int percentComplete = 0;            do {                int inputBufIndex = 0;                while (inputBufIndex != -1 && hasMoreData) {                    inputBufIndex = codec.dequeueinputBuffer(CODEC_TIMEOUT_IN_MS);                    if (inputBufIndex >= 0) {                        ByteBuffer dstBuf = codecinputBuffers[inputBufIndex];                        dstBuf.clear();                        int bytesRead = fis.read(tempBuffer,dstBuf.limit());                        Log.e("bytesRead","Readed "+bytesRead);                        if (bytesRead == -1) { // -1 implIEs EOS                            hasMoreData = false;                            codec.queueinputBuffer(inputBufIndex,(long) presentationTimeUs,MediaCodec.BUFFER_FLAG_END_OF_STREAM);                        } else {                            totalBytesRead += bytesRead;                            dstBuf.put(tempBuffer,bytesRead);                            codec.queueinputBuffer(inputBufIndex,bytesRead,0);                            presentationTimeUs = 1000000l * (totalBytesRead / 2) / SAMPliNG_RATE;                        }                    }                }                // Drain audio                int outputBufIndex = 0;                while (outputBufIndex != MediaCodec.INFO_TRY_AGAIN_LATER) {                    outputBufIndex = codec.dequeueOutputBuffer(outBuffInfo,CODEC_TIMEOUT_IN_MS);                    if (outputBufIndex >= 0) {                        ByteBuffer encodedData = codecOutputBuffers[outputBufIndex];                        encodedData.position(outBuffInfo.offset);                        encodedData.limit(outBuffInfo.offset + outBuffInfo.size);                        if ((outBuffInfo.flags & MediaCodec.BUFFER_FLAG_CODEC_CONfig) != 0 && outBuffInfo.size != 0) {                            codec.releaSEOutputBuffer(outputBufIndex,false);                        }else{                            mux.writeSampleData(audioTrackIDx,codecOutputBuffers[outputBufIndex],outBuffInfo);                            codec.releaSEOutputBuffer(outputBufIndex,false);                        }                    } else if (outputBufIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {                        outputFormat = codec.getoutputFormat();                        Log.v(LOGTAG,"Output format changed - " + outputFormat);                        audioTrackIDx = mux.addTrack(outputFormat);                        mux.start();                    } else if (outputBufIndex == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {                        Log.e(LOGTAG,"Output buffers changed during encode!");                    } else if (outputBufIndex == MediaCodec.INFO_TRY_AGAIN_LATER) {                        // NO OP                    } else {                        Log.e(LOGTAG,"UnkNown return code from dequeueOutputBuffer - " + outputBufIndex);                    }                }                percentComplete = (int) Math.round(((float) totalBytesRead / (float) inputfile.length()) * 100.0);                Log.v(LOGTAG,"Conversion % - " + percentComplete);            } while (outBuffInfo.flags != MediaCodec.BUFFER_FLAG_END_OF_STREAM);            fis.close();            mux.stop();            mux.release();            Log.v(LOGTAG,"Compression done ...");        } catch (fileNotFoundException e) {            Log.e(LOGTAG,"file not found!",e);        } catch (IOException e) {            Log.e(LOGTAG,"IO exception!",e);        }        //mStop = false;        // Notify UI thread...    }};

总结

以上是内存溢出为你收集整理的在Android上编辑wav到AAC全部内容，希望文章能够帮你解决在Android上编辑wav到AAC所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。