I need to convert a PCM file to an AAC or MP4 file. So far I have done this with MediaCodec and MediaMuxer , but MediaMuxer is supported with Android 4.3. Is there a way to do the conversion without using MediaMuxer ?
My code is:
MediaMuxer mux = null; try { File inputFile = new File(filePath + ".pcm"); FileInputStream fis = new FileInputStream(inputFile); mux = new MediaMuxer(filePath + ".mp4", 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); MediaCodec codec = MediaCodec.createEncoderByType(COMPRESSED_AUDIO_FILE_MIME_TYPE); codec.configure(outputFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE); codec.start(); ByteBuffer[] codecInputBuffers = codec.getInputBuffers(); 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; 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, 0, dstBuf.limit()); if (bytesRead == -1) { // -1 implies EOS hasMoreData = false; codec.queueInputBuffer(inputBufIndex, 0, 0, (long) presentationTimeUs, MediaCodec.BUFFER_FLAG_END_OF_STREAM); } else { totalBytesRead += bytesRead; dstBuf.put(tempBuffer, 0, bytesRead); codec.queueInputBuffer(inputBufIndex, 0, bytesRead, (long) presentationTimeUs, 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("AUDIO", "Output format changed - " + outputFormat); audioTrackIdx = mux.addTrack(outputFormat); mux.start(); } else if (outputBufIndex == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) { Log.e("AUDIO", "Output buffers changed during encode!"); } else if (outputBufIndex != MediaCodec.INFO_TRY_AGAIN_LATER){ Log.e("AUDIO", "Unknown return code from dequeueOutputBuffer - " + outputBufIndex); } } percentComplete = (int) Math.round(((float) totalBytesRead / (float) inputFile.length()) * 100.0); Log.v("AUDIO", "Conversion % - " + percentComplete); } while (outBuffInfo.flags != MediaCodec.BUFFER_FLAG_END_OF_STREAM); fis.close(); mux.stop(); mux.release();
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