content: package com.amosyuen.videorecorder.recorder;
  
  /*
   * Copyright (C) 2009-2015 Samuel Audet
   *
   * Licensed either under the Apache License, Version 2.0, or (at your option)
   * under the terms of the GNU General Public License as published by
   * the Free Software Foundation (subject to the "Classpath" exception),
   * either version 2, or any later version (collectively, the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *     http://www.gnu.org/licenses/
   *     http://www.gnu.org/software/classpath/license.html
   *
   * or as provided in the LICENSE.txt file that accompanied this code.
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   *
   * Based on the output-example.c file included in FFmpeg 0.6.5
   * as well as on the decoding_encoding.c file included in FFmpeg 0.11.1,
   * which are covered by the following copyright notice:
   *
   * Libavformat API example: Output a media file in any supported
   * libavformat format. The default codecs are used.
   *
   * Copyright (c) 2001,2003 Fabrice Bellard
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, mergeOnlyClass, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  import org.bytedeco.javacpp.BytePointer;
  import org.bytedeco.javacpp.DoublePointer;
  import org.bytedeco.javacpp.FloatPointer;
  import org.bytedeco.javacpp.IntPointer;
  import org.bytedeco.javacpp.Loader;
  import org.bytedeco.javacpp.Pointer;
  import org.bytedeco.javacpp.PointerPointer;
  import org.bytedeco.javacpp.ShortPointer;
  import org.bytedeco.javacpp.avcodec.AVCodec;
  import org.bytedeco.javacpp.avcodec.AVCodecContext;
  import org.bytedeco.javacpp.avcodec.AVPacket;
  import org.bytedeco.javacpp.avcodec.AVPicture;
  import org.bytedeco.javacpp.avformat.AVFormatContext;
  import org.bytedeco.javacpp.avformat.AVIOContext;
  import org.bytedeco.javacpp.avformat.AVOutputFormat;
  import org.bytedeco.javacpp.avformat.AVStream;
  import org.bytedeco.javacpp.avutil.AVDictionary;
  import org.bytedeco.javacpp.avutil.AVFrame;
  import org.bytedeco.javacpp.avutil.AVRational;
  import org.bytedeco.javacpp.swresample.SwrContext;
  import org.bytedeco.javacpp.swscale.SwsContext;
  import org.bytedeco.javacv.Frame;
  import org.bytedeco.javacv.FrameRecorder;
  
  import java.io.File;
  import java.nio.Buffer;
  import java.nio.ByteBuffer;
  import java.nio.ByteOrder;
  import java.nio.DoubleBuffer;
  import java.nio.FloatBuffer;
  import java.nio.IntBuffer;
  import java.nio.ShortBuffer;
  import java.util.Map.Entry;
  
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_AAC;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_FFV1;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_FLV1;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_H263;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_H264;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_HUFFYUV;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_MPEG1VIDEO;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_MPEG2VIDEO;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_MPEG4;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_NONE;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_PCM_S16BE;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_PCM_S16LE;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_PCM_U16BE;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_PCM_U16LE;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_PNG;
  import static org.bytedeco.javacpp.avcodec.AV_CODEC_ID_RAWVIDEO;
  import static org.bytedeco.javacpp.avcodec.AV_PKT_FLAG_KEY;
  import static org.bytedeco.javacpp.avcodec.CODEC_CAP_EXPERIMENTAL;
  import static org.bytedeco.javacpp.avcodec.CODEC_FLAG_GLOBAL_HEADER;
  import static org.bytedeco.javacpp.avcodec.CODEC_FLAG_QSCALE;
  import static org.bytedeco.javacpp.avcodec.FF_MIN_BUFFER_SIZE;
  import static org.bytedeco.javacpp.avcodec.av_free_packet;
  import static org.bytedeco.javacpp.avcodec.av_init_packet;
  import static org.bytedeco.javacpp.avcodec.avcodec_close;
  import static org.bytedeco.javacpp.avcodec.avcodec_copy_context;
  import static org.bytedeco.javacpp.avcodec.avcodec_encode_audio2;
  import static org.bytedeco.javacpp.avcodec.avcodec_encode_video2;
  import static org.bytedeco.javacpp.avcodec.avcodec_fill_audio_frame;
  import static org.bytedeco.javacpp.avcodec.avcodec_find_encoder;
  import static org.bytedeco.javacpp.avcodec.avcodec_find_encoder_by_name;
  import static org.bytedeco.javacpp.avcodec.avcodec_open2;
  import static org.bytedeco.javacpp.avcodec.avpicture_fill;
  import static org.bytedeco.javacpp.avcodec.avpicture_get_size;
  import static org.bytedeco.javacpp.avformat.AVFMT_GLOBALHEADER;
  import static org.bytedeco.javacpp.avformat.AVFMT_NOFILE;
  import static org.bytedeco.javacpp.avformat.AVFMT_RAWPICTURE;
  import static org.bytedeco.javacpp.avformat.AVIO_FLAG_WRITE;
  import static org.bytedeco.javacpp.avformat.av_dump_format;
  import static org.bytedeco.javacpp.avformat.av_guess_format;
  import static org.bytedeco.javacpp.avformat.av_interleaved_write_frame;
  import static org.bytedeco.javacpp.avformat.av_register_all;
  import static org.bytedeco.javacpp.avformat.av_write_frame;
  import static org.bytedeco.javacpp.avformat.av_write_trailer;
  import static org.bytedeco.javacpp.avformat.avformat_alloc_output_context2;
  import static org.bytedeco.javacpp.avformat.avformat_network_init;
  import static org.bytedeco.javacpp.avformat.avformat_new_stream;
  import static org.bytedeco.javacpp.avformat.avformat_write_header;
  import static org.bytedeco.javacpp.avformat.avio_close;
  import static org.bytedeco.javacpp.avformat.avio_open;
  import static org.bytedeco.javacpp.avutil.AVMEDIA_TYPE_AUDIO;
  import static org.bytedeco.javacpp.avutil.AVMEDIA_TYPE_VIDEO;
  import static org.bytedeco.javacpp.avutil.AV_NOPTS_VALUE;
  import static org.bytedeco.javacpp.avutil.AV_PIX_FMT_BGR24;
  import static org.bytedeco.javacpp.avutil.AV_PIX_FMT_GRAY16BE;
  import static org.bytedeco.javacpp.avutil.AV_PIX_FMT_GRAY16LE;
  import static org.bytedeco.javacpp.avutil.AV_PIX_FMT_GRAY8;
  import static org.bytedeco.javacpp.avutil.AV_PIX_FMT_NONE;
  import static org.bytedeco.javacpp.avutil.AV_PIX_FMT_NV21;
  import static org.bytedeco.javacpp.avutil.AV_PIX_FMT_RGB32;
  import static org.bytedeco.javacpp.avutil.AV_PIX_FMT_RGBA;
  import static org.bytedeco.javacpp.avutil.AV_PIX_FMT_YUV420P;
  import static org.bytedeco.javacpp.avutil.AV_SAMPLE_FMT_DBL;
  import static org.bytedeco.javacpp.avutil.AV_SAMPLE_FMT_DBLP;
  import static org.bytedeco.javacpp.avutil.AV_SAMPLE_FMT_FLT;
  import static org.bytedeco.javacpp.avutil.AV_SAMPLE_FMT_FLTP;
  import static org.bytedeco.javacpp.avutil.AV_SAMPLE_FMT_NONE;
  import static org.bytedeco.javacpp.avutil.AV_SAMPLE_FMT_S16;
  import static org.bytedeco.javacpp.avutil.AV_SAMPLE_FMT_S16P;
  import static org.bytedeco.javacpp.avutil.AV_SAMPLE_FMT_S32;
  import static org.bytedeco.javacpp.avutil.AV_SAMPLE_FMT_S32P;
  import static org.bytedeco.javacpp.avutil.AV_SAMPLE_FMT_U8;
  import static org.bytedeco.javacpp.avutil.AV_SAMPLE_FMT_U8P;
  import static org.bytedeco.javacpp.avutil.FF_QP2LAMBDA;
  import static org.bytedeco.javacpp.avutil.av_d2q;
  import static org.bytedeco.javacpp.avutil.av_dict_free;
  import static org.bytedeco.javacpp.avutil.av_dict_set;
  import static org.bytedeco.javacpp.avutil.av_find_nearest_q_idx;
  import static org.bytedeco.javacpp.avutil.av_frame_alloc;
  import static org.bytedeco.javacpp.avutil.av_frame_free;
  import static org.bytedeco.javacpp.avutil.av_free;
  import static org.bytedeco.javacpp.avutil.av_get_bytes_per_sample;
  import static org.bytedeco.javacpp.avutil.av_get_default_channel_layout;
  import static org.bytedeco.javacpp.avutil.av_inv_q;
  import static org.bytedeco.javacpp.avutil.av_malloc;
  import static org.bytedeco.javacpp.avutil.av_rescale_q;
  import static org.bytedeco.javacpp.avutil.av_sample_fmt_is_planar;
  import static org.bytedeco.javacpp.avutil.av_samples_get_buffer_size;
  import static org.bytedeco.javacpp.swresample.swr_alloc_set_opts;
  import static org.bytedeco.javacpp.swresample.swr_convert;
  import static org.bytedeco.javacpp.swresample.swr_free;
  import static org.bytedeco.javacpp.swresample.swr_init;
  import static org.bytedeco.javacpp.swscale.SWS_BILINEAR;
  import static org.bytedeco.javacpp.swscale.sws_freeContext;
  import static org.bytedeco.javacpp.swscale.sws_getCachedContext;
  import static org.bytedeco.javacpp.swscale.sws_scale;
  
  /**
   * Copy of {@link org.bytedeco.javacv.FFmpegFrameRecorder} that allows videos with an even width
   * rather than rounding video width to a multiple of 16.
   */
  public class FFmpegFrameRecorder extends FrameRecorder {
      public static org.bytedeco.javacv.FFmpegFrameRecorder createDefault(File f, int w, int h)   throws Exception { return new org.bytedeco.javacv.FFmpegFrameRecorder(f, w, h); }
      public static org.bytedeco.javacv.FFmpegFrameRecorder createDefault(String f, int w, int h) throws Exception { return new org.bytedeco.javacv.FFmpegFrameRecorder(f, w, h); }
  
      private static Exception loadingException = null;
      public static void tryLoad() throws Exception {
          if (loadingException != null) {
              throw loadingException;
          } else {
              try {
                  System.loadLibrary("avutil");
                  System.loadLibrary("swresample");
                  System.loadLibrary("avcodec");
                  System.loadLibrary("avformat");
                  System.loadLibrary("swscale");
  
                  /* initialize libavcodec, and register all codecs and formats */
                  av_register_all();
                  avformat_network_init();
              } catch (Throwable t) {
                  if (t instanceof Exception) {
                      throw loadingException = (Exception)t;
                  } else {
                      throw loadingException = new Exception("Failed to load " + org.bytedeco.javacv.FFmpegFrameRecorder.class, t);
                  }
              }
          }
      }
  
      static {
          try {
              tryLoad();
          } catch (Exception ex) { }
      }
  
      public FFmpegFrameRecorder(File file, int audioChannels) {
          this(file, 0, 0, audioChannels);
      }
      public FFmpegFrameRecorder(String filename, int audioChannels) {
          this(filename, 0, 0, audioChannels);
      }
      public FFmpegFrameRecorder(File file, int imageWidth, int imageHeight) {
          this(file, imageWidth, imageHeight, 0);
      }
      public FFmpegFrameRecorder(String filename, int imageWidth, int imageHeight) {
          this(filename, imageWidth, imageHeight, 0);
      }
      public FFmpegFrameRecorder(File file, int imageWidth, int imageHeight, int audioChannels) {
          this(file.getAbsolutePath(), imageWidth, imageHeight, audioChannels);
      }
      public FFmpegFrameRecorder(String filename, int imageWidth, int imageHeight, int audioChannels) {
          this.filename      = filename;
          this.imageWidth    = imageWidth;
          this.imageHeight   = imageHeight;
          this.audioChannels = audioChannels;
  
          this.pixelFormat   = AV_PIX_FMT_NONE;
          this.videoCodec    = AV_CODEC_ID_NONE;
          this.videoBitrate  = 400000;
          this.frameRate     = 30;
  
          this.sampleFormat  = AV_SAMPLE_FMT_NONE;
          this.audioCodec    = AV_CODEC_ID_NONE;
          this.audioBitrate  = 64000;
          this.sampleRate    = 44100;
  
          this.interleaved = true;
  
          this.video_pkt = new AVPacket();
          this.audio_pkt = new AVPacket();
      }
      public void release() throws Exception {
          synchronized (org.bytedeco.javacpp.avcodec.class) {
              releaseUnsafe();
          }
      }
      void releaseUnsafe() throws Exception {
          /* close each codec */
          if (video_c != null) {
              avcodec_close(video_c);
              video_c = null;
          }
          if (audio_c != null) {
              avcodec_close(audio_c);
              audio_c = null;
          }
          if (picture_buf != null) {
              av_free(picture_buf);
              picture_buf = null;
          }
          if (picture != null) {
              av_frame_free(picture);
              picture = null;
          }
          if (tmp_picture != null) {
              av_frame_free(tmp_picture);
              tmp_picture = null;
          }
          if (video_outbuf != null) {
              av_free(video_outbuf);
              video_outbuf = null;
          }
          if (frame != null) {
              av_frame_free(frame);
              frame = null;
          }
          if (samples_out != null) {
              for (int i = 0; i < samples_out.length; i++) {
                  av_free(samples_out[i].position(0));
              }
              samples_out = null;
          }
          if (audio_outbuf != null) {
              av_free(audio_outbuf);
              audio_outbuf = null;
          }
          if (video_st != null && video_st.metadata() != null) {
              av_dict_free(video_st.metadata());
              video_st.metadata(null);
          }
          if (audio_st != null && audio_st.metadata() != null) {
              av_dict_free(audio_st.metadata());
              audio_st.metadata(null);
          }
          video_st = null;
          audio_st = null;
  
          if (oc != null && !oc.isNull()) {
              if ((oformat.flags() & AVFMT_NOFILE) == 0) {
                  /* close the output file */
                  avio_close(oc.pb());
              }
  
              /* free the streams */
              int nb_streams = oc.nb_streams();
              for(int i = 0; i < nb_streams; i++) {
                  av_free(oc.streams(i).codec());
                  av_free(oc.streams(i));
              }
  
              /* free metadata */
              if (oc.metadata() != null) {
                  av_dict_free(oc.metadata());
                  oc.metadata(null);
              }
  
              /* free the stream */
              av_free(oc);
              oc = null;
          }
  
          if (img_convert_ctx != null) {
              sws_freeContext(img_convert_ctx);
              img_convert_ctx = null;
          }
  
          if (samples_convert_ctx != null) {
              swr_free(samples_convert_ctx);
              samples_convert_ctx = null;
          }
      }
      @Override protected void finalize() throws Throwable {
          super.finalize();
          release();
      }
  
      private String filename;
      private AVFrame picture, tmp_picture;
      private BytePointer picture_buf;
      private BytePointer video_outbuf;
      private int video_outbuf_size;
      private AVFrame frame;
      private Pointer[] samples_in;
      private BytePointer[] samples_out;
      private PointerPointer samples_in_ptr;
      private PointerPointer samples_out_ptr;
      private BytePointer audio_outbuf;
      private int audio_outbuf_size;
      private int audio_input_frame_size;
      private AVOutputFormat oformat;
      private AVFormatContext oc;
      private AVCodec video_codec, audio_codec;
      private AVCodecContext video_c, audio_c;
      private AVStream video_st, audio_st;
      private SwsContext img_convert_ctx;
      private SwrContext samples_convert_ctx;
      private int samples_channels, samples_format, samples_rate;
      private AVPacket video_pkt, audio_pkt;
      private int[] got_video_packet, got_audio_packet;
      private AVFormatContext ifmt_ctx;
  
      @Override public int getFrameNumber() {
          return picture == null ? super.getFrameNumber() : (int)picture.pts();
      }
      @Override public void setFrameNumber(int frameNumber) {
          if (picture == null) { super.setFrameNumber(frameNumber); } else { picture.pts(frameNumber); }
      }
  
      // best guess for timestamp in microseconds...
      @Override public long getTimestamp() {
          return Math.round(getFrameNumber() * 1000000L / getFrameRate());
      }
      @Override public void setTimestamp(long timestamp)  {
          setFrameNumber((int)Math.round(timestamp * getFrameRate() / 1000000L));
      }
  
      public void start(AVFormatContext ifmt_ctx) throws Exception {
          this.ifmt_ctx = ifmt_ctx;
          start();
      }
  
      public void start() throws Exception {
          synchronized (org.bytedeco.javacpp.avcodec.class) {
              startUnsafe();
          }
      }
  
      void startUnsafe() throws Exception {
          int ret;
          picture = null;
          tmp_picture = null;
          picture_buf = null;
          frame = null;
          video_outbuf = null;
          audio_outbuf = null;
          oc = new AVFormatContext(null);
          video_c = null;
          audio_c = null;
          video_st = null;
          audio_st = null;
          got_video_packet = new int[1];
          got_audio_packet = new int[1];
  
          /* auto detect the output format from the name. */
          String format_name = format == null || format.length() == 0 ? null : format;
          if ((oformat = av_guess_format(format_name, filename, null)) == null) {
              int proto = filename.indexOf("://");
              if (proto > 0) {
                  format_name = filename.substring(0, proto);
              }
              if ((oformat = av_guess_format(format_name, filename, null)) == null) {
                  throw new Exception("av_guess_format() error: Could not guess output format for \"" + filename + "\" and " + format + " format.");
              }
          }
          format_name = oformat.name().getString();
  
          /* allocate the output media context */
          if (avformat_alloc_output_context2(oc, null, format_name, filename) < 0) {
              throw new Exception("avformat_alloc_context2() error:\tCould not allocate format context");
          }
  
          oc.oformat(oformat);
          oc.filename().putString(filename);
  
          /* add the audio and video streams using the format codecs
             and initialize the codecs */
          AVStream inpVideoStream = null, inpAudioStream = null;
          if (ifmt_ctx != null) {
              // get input video and audio stream indices from ifmt_ctx
              for (int idx = 0; idx < ifmt_ctx.nb_streams(); idx++) {
                  AVStream inputStream = ifmt_ctx.streams(idx);
                  if (inputStream.codec().codec_type() == AVMEDIA_TYPE_VIDEO) {
                      inpVideoStream = inputStream;
                      videoCodec = inpVideoStream.codec().codec_id();
                      if (inpVideoStream.r_frame_rate().num() != AV_NOPTS_VALUE && inpVideoStream.r_frame_rate().den() != 0) {
                          frameRate = (inpVideoStream.r_frame_rate().num()) / (inpVideoStream.r_frame_rate().den());
                      }
  
                  } else if (inputStream.codec().codec_type() == AVMEDIA_TYPE_AUDIO) {
                      inpAudioStream = inputStream;
                      audioCodec = inpAudioStream.codec().codec_id();
                  }
              }
          }
  
          if (imageWidth > 0 && imageHeight > 0) {
              if (videoCodec != AV_CODEC_ID_NONE) {
                  oformat.video_codec(videoCodec);
              } else if ("flv".equals(format_name)) {
                  oformat.video_codec(AV_CODEC_ID_FLV1);
              } else if ("mp4".equals(format_name)) {
                  oformat.video_codec(AV_CODEC_ID_MPEG4);
              } else if ("3gp".equals(format_name)) {
                  oformat.video_codec(AV_CODEC_ID_H263);
              } else if ("avi".equals(format_name)) {
                  oformat.video_codec(AV_CODEC_ID_HUFFYUV);
              }
  
              /* find the video encoder */
              if ((video_codec = avcodec_find_encoder_by_name(videoCodecName)) == null &&
                      (video_codec = avcodec_find_encoder(oformat.video_codec())) == null) {
                  release();
                  throw new Exception("avcodec_find_encoder() error: Video codec not found.");
              }
              oformat.video_codec(video_codec.id());
  
              AVRational frame_rate = av_d2q(frameRate, 1001000);
              AVRational supported_framerates = video_codec.supported_framerates();
              if (supported_framerates != null) {
                  int idx = av_find_nearest_q_idx(frame_rate, supported_framerates);
                  frame_rate = supported_framerates.position(idx);
              }
  
              /* add a video output stream */
              if ((video_st = avformat_new_stream(oc, video_codec)) == null) {
                  release();
                  throw new Exception("avformat_new_stream() error: Could not allocate video stream.");
              }
  
              video_c = video_st.codec();
  
              if (inpVideoStream != null) {
                  if ((ret = avcodec_copy_context(video_st.codec(), inpVideoStream.codec())) < 0) {
                      release();
                      throw new Exception("avcodec_copy_context() error:\tFailed to copy context from input to output stream codec context");
                  }
  
                  videoBitrate = (int) inpVideoStream.codec().bit_rate();
                  pixelFormat = inpVideoStream.codec().pix_fmt();
                  aspectRatio = inpVideoStream.codec().sample_aspect_ratio().den() / inpVideoStream.codec().sample_aspect_ratio().den() * 1.d;
                  videoQuality = inpVideoStream.codec().global_quality();
                  video_c.codec_tag(0);
              }
  
              video_c.codec_id(oformat.video_codec());
              video_c.codec_type(AVMEDIA_TYPE_VIDEO);
  
              /* put sample parameters */
              video_c.bit_rate(videoBitrate);
              /* resolution must be a multiple of two. Scale mHeight to maintain the aspect ratio. */
              if (imageWidth % 2 == 1) {
                  int roundedWidth = imageWidth + 1;
                  imageHeight = (roundedWidth * imageHeight + imageWidth / 2) / imageWidth;
                  imageWidth = roundedWidth;
              }
              video_c.width(imageWidth);
              video_c.height(imageHeight);
              if (aspectRatio > 0) {
                  AVRational r = av_d2q(aspectRatio, 255);
                  video_c.sample_aspect_ratio(r);
                  video_st.sample_aspect_ratio(r);
              }
              /* time base: this is the fundamental unit of time (in seconds) in terms
                 of which frame timestamps are represented. for fixed-fps content,
                 timebase should be 1/framerate and timestamp increments should be
                 identically 1. */
              video_c.time_base(av_inv_q(frame_rate));
              video_st.time_base(av_inv_q(frame_rate));
              if (gopSize >= 0) {
                  video_c.gop_size(gopSize); /* emit one intra frame every gopSize frames at most */
              }
              if (videoQuality >= 0) {
                  video_c.flags(video_c.flags() | CODEC_FLAG_QSCALE);
                  video_c.global_quality((int)Math.round(FF_QP2LAMBDA * videoQuality));
              }
  
              if (pixelFormat != AV_PIX_FMT_NONE) {
                  video_c.pix_fmt(pixelFormat);
              } else if (video_c.codec_id() == AV_CODEC_ID_RAWVIDEO || video_c.codec_id() == AV_CODEC_ID_PNG ||
                      video_c.codec_id() == AV_CODEC_ID_HUFFYUV  || video_c.codec_id() == AV_CODEC_ID_FFV1) {
                  video_c.pix_fmt(AV_PIX_FMT_RGB32);   // appropriate for common lossless formats
              } else {
                  video_c.pix_fmt(AV_PIX_FMT_YUV420P); // lossy, but works with about everything
              }
  
              if (video_c.codec_id() == AV_CODEC_ID_MPEG2VIDEO) {
                  /* just for testing, we also add B frames */
                  video_c.max_b_frames(2);
              } else if (video_c.codec_id() == AV_CODEC_ID_MPEG1VIDEO) {
                  /* Needed to avoid using macroblocks in which some coeffs overflow.
                     This does not happen with normal video, it just happens here as
                     the motion of the chroma plane does not match the luma plane. */
                  video_c.mb_decision(2);
              } else if (video_c.codec_id() == AV_CODEC_ID_H263) {
                  // H.263 does not support any other resolution than the following
                  if (imageWidth <= 128 && imageHeight <= 96) {
                      video_c.width(128).height(96);
                  } else if (imageWidth <= 176 && imageHeight <= 144) {
                      video_c.width(176).height(144);
                  } else if (imageWidth <= 352 && imageHeight <= 288) {
                      video_c.width(352).height(288);
                  } else if (imageWidth <= 704 && imageHeight <= 576) {
                      video_c.width(704).height(576);
                  } else {
                      video_c.width(1408).height(1152);
                  }
              } else if (video_c.codec_id() == AV_CODEC_ID_H264) {
                  // default to constrained baseline to produce content that plays back on anything,
                  // without any significant tradeoffs for most use cases
                  video_c.profile(AVCodecContext.FF_PROFILE_H264_CONSTRAINED_BASELINE);
              }
  
              // some formats want stream headers to be separate
              if ((oformat.flags() & AVFMT_GLOBALHEADER) != 0) {
                  video_c.flags(video_c.flags() | CODEC_FLAG_GLOBAL_HEADER);
              }
  
              if ((video_codec.capabilities() & CODEC_CAP_EXPERIMENTAL) != 0) {
                  video_c.strict_std_compliance(AVCodecContext.FF_COMPLIANCE_EXPERIMENTAL);
              }
          }
  
          /*
           * add an audio output stream
           */
          if (audioChannels > 0 && audioBitrate > 0 && sampleRate > 0) {
              if (audioCodec != AV_CODEC_ID_NONE) {
                  oformat.audio_codec(audioCodec);
              } else if ("flv".equals(format_name) || "mp4".equals(format_name) || "3gp".equals(format_name)) {
                  oformat.audio_codec(AV_CODEC_ID_AAC);
              } else if ("avi".equals(format_name)) {
                  oformat.audio_codec(AV_CODEC_ID_PCM_S16LE);
              }
  
              /* find the audio encoder */
              if ((audio_codec = avcodec_find_encoder_by_name(audioCodecName)) == null &&
                      (audio_codec = avcodec_find_encoder(oformat.audio_codec())) == null) {
                  release();
                  throw new Exception("avcodec_find_encoder() error: Audio codec not found.");
              }
              oformat.audio_codec(audio_codec.id());
  
              if ((audio_st = avformat_new_stream(oc, audio_codec)) == null) {
                  release();
                  throw new Exception("avformat_new_stream() error: Could not allocate audio stream.");
              }
  
              audio_c = audio_st.codec();
  
              if(inpAudioStream != null && audioChannels > 0){
                  if ((ret = avcodec_copy_context(audio_st.codec(), inpAudioStream.codec()))  < 0) {
                      throw new Exception("avcodec_copy_context() error:\tFailed to copy context from input audio to output audio stream codec context\n");
                  }
  
                  audioBitrate = (int) inpAudioStream.codec().bit_rate();
                  sampleRate = inpAudioStream.codec().sample_rate();
                  audioChannels = inpAudioStream.codec().channels();
                  sampleFormat = inpAudioStream.codec().sample_fmt();
                  audioQuality = inpAudioStream.codec().global_quality();
                  audio_c.codec_tag(0);
                  audio_st.pts(inpAudioStream.pts());
                  audio_st.duration(inpAudioStream.duration());
                  audio_st.time_base().num(inpAudioStream.time_base().num());
                  audio_st.time_base().den(inpAudioStream.time_base().den());
              }
  
              audio_c.codec_id(oformat.audio_codec());
              audio_c.codec_type(AVMEDIA_TYPE_AUDIO);
  
  
              /* put sample parameters */
              audio_c.bit_rate(audioBitrate);
              audio_c.sample_rate(sampleRate);
              audio_c.channels(audioChannels);
              audio_c.channel_layout(av_get_default_channel_layout(audioChannels));
              if (sampleFormat != AV_SAMPLE_FMT_NONE) {
                  audio_c.sample_fmt(sampleFormat);
              } else {
                  // use AV_SAMPLE_FMT_S16 by default, if available
                  audio_c.sample_fmt(AV_SAMPLE_FMT_FLTP);
                  IntPointer formats = audio_c.codec().sample_fmts();
                  for (int i = 0; formats.get(i) != -1; i++) {
                      if (formats.get(i) == AV_SAMPLE_FMT_S16) {
                          audio_c.sample_fmt(AV_SAMPLE_FMT_S16);
                          break;
                      }
                  }
              }
              audio_c.time_base().num(1).den(sampleRate);
              audio_st.time_base().num(1).den(sampleRate);
              switch (audio_c.sample_fmt()) {
                  case AV_SAMPLE_FMT_U8:
                  case AV_SAMPLE_FMT_U8P:  audio_c.bits_per_raw_sample(8);  break;
                  case AV_SAMPLE_FMT_S16:
                  case AV_SAMPLE_FMT_S16P: audio_c.bits_per_raw_sample(16); break;
                  case AV_SAMPLE_FMT_S32:
                  case AV_SAMPLE_FMT_S32P: audio_c.bits_per_raw_sample(32); break;
                  case AV_SAMPLE_FMT_FLT:
                  case AV_SAMPLE_FMT_FLTP: audio_c.bits_per_raw_sample(32); break;
                  case AV_SAMPLE_FMT_DBL:
                  case AV_SAMPLE_FMT_DBLP: audio_c.bits_per_raw_sample(64); break;
                  default: assert false;
              }
              if (audioQuality >= 0) {
                  audio_c.flags(audio_c.flags() | CODEC_FLAG_QSCALE);
                  audio_c.global_quality((int)Math.round(FF_QP2LAMBDA * audioQuality));
              }
  
              // some formats want stream headers to be separate
              if ((oformat.flags() & AVFMT_GLOBALHEADER) != 0) {
                  audio_c.flags(audio_c.flags() | CODEC_FLAG_GLOBAL_HEADER);
              }
  
              if ((audio_codec.capabilities() & CODEC_CAP_EXPERIMENTAL) != 0) {
                  audio_c.strict_std_compliance(AVCodecContext.FF_COMPLIANCE_EXPERIMENTAL);
              }
          }
  
          av_dump_format(oc, 0, filename, 1);
  
          /* now that all the parameters are set, we can open the audio and
             video codecs and allocate the necessary encode buffers */
          if (video_st != null && inpVideoStream == null) {
              AVDictionary options = new AVDictionary(null);
              if (videoQuality >= 0) {
                  av_dict_set(options, "crf", "" + videoQuality, 0);
              }
              for (Entry<String, String> e : videoOptions.entrySet()) {
                  av_dict_set(options, e.getKey(), e.getValue(), 0);
              }
              /* open the codec */
              if ((ret = avcodec_open2(video_c, video_codec, options)) < 0) {
                  release();
                  throw new Exception("avcodec_open2() error " + ret + ": Could not open video codec.");
              }
              av_dict_free(options);
  
              video_outbuf = null;
              if ((oformat.flags() & AVFMT_RAWPICTURE) == 0) {
                  /* allocate output buffer */
                  /* XXX: API change will be done */
                  /* buffers passed into lav* can be allocated any way you prefer,
                     as long as they're aligned enough for the architecture, and
                     they're freed appropriately (such as using av_free for buffers
                     allocated with av_malloc) */
                  video_outbuf_size = Math.max(256 * 1024, 8 * video_c.width() * video_c.height()); // a la ffmpeg.c
                  video_outbuf = new BytePointer(av_malloc(video_outbuf_size));
              }
  
              /* allocate the encoded raw picture */
              if ((picture = av_frame_alloc()) == null) {
                  release();
                  throw new Exception("av_frame_alloc() error: Could not allocate picture.");
              }
              picture.pts(0); // magic required by libx264
  
              int size = avpicture_get_size(video_c.pix_fmt(), video_c.width(), video_c.height());
              if ((picture_buf = new BytePointer(av_malloc(size))).isNull()) {
                  release();
                  throw new Exception("av_malloc() error: Could not allocate picture buffer.");
              }
  
              /* if the output format is not equal to the image format, then a temporary
                 picture is needed too. It is then converted to the required output format */
              if ((tmp_picture = av_frame_alloc()) == null) {
                  release();
                  throw new Exception("av_frame_alloc() error: Could not allocate temporary picture.");
              }
  
              AVDictionary metadata = new AVDictionary(null);
              for (Entry<String, String> e : videoMetadata.entrySet()) {
                  av_dict_set(metadata, e.getKey(), e.getValue(), 0);
              }
              video_st.metadata(metadata);
          }
  
          if (audio_st != null && inpAudioStream == null) {
              AVDictionary options = new AVDictionary(null);
              if (audioQuality >= 0) {
                  av_dict_set(options, "crf", "" + audioQuality, 0);
              }
              for (Entry<String, String> e : audioOptions.entrySet()) {
                  av_dict_set(options, e.getKey(), e.getValue(), 0);
              }
              /* open the codec */
              if ((ret = avcodec_open2(audio_c, audio_codec, options)) < 0) {
                  release();
                  throw new Exception("avcodec_open2() error " + ret + ": Could not open audio codec.");
              }
              av_dict_free(options);
  
              audio_outbuf_size = 256 * 1024;
              audio_outbuf = new BytePointer(av_malloc(audio_outbuf_size));
  
              /* ugly hack for PCM codecs (will be removed ASAP with new PCM
                 support to compute the input frame size in samples */
              if (audio_c.frame_size() <= 1) {
                  audio_outbuf_size = FF_MIN_BUFFER_SIZE;
                  audio_input_frame_size = audio_outbuf_size / audio_c.channels();
                  switch (audio_c.codec_id()) {
                      case AV_CODEC_ID_PCM_S16LE:
                      case AV_CODEC_ID_PCM_S16BE:
                      case AV_CODEC_ID_PCM_U16LE:
                      case AV_CODEC_ID_PCM_U16BE:
                          audio_input_frame_size >>= 1;
                          break;
                      default:
                          break;
                  }
              } else {
                  audio_input_frame_size = audio_c.frame_size();
              }
              //int bufferSize = audio_input_frame_size * audio_c.bits_per_raw_sample()/8 * audio_c.channels();
              int planes = av_sample_fmt_is_planar(audio_c.sample_fmt()) != 0 ? (int)audio_c.channels() : 1;
              int data_size = av_samples_get_buffer_size((IntPointer)null, audio_c.channels(),
                      audio_input_frame_size, audio_c.sample_fmt(), 1) / planes;
              samples_out = new BytePointer[planes];
              for (int i = 0; i < samples_out.length; i++) {
                  samples_out[i] = new BytePointer(av_malloc(data_size)).capacity(data_size);
              }
              samples_in = new Pointer[AVFrame.AV_NUM_DATA_POINTERS];
              samples_in_ptr  = new PointerPointer(AVFrame.AV_NUM_DATA_POINTERS);
              samples_out_ptr = new PointerPointer(AVFrame.AV_NUM_DATA_POINTERS);
  
              /* allocate the audio frame */
              if ((frame = av_frame_alloc()) == null) {
                  release();
                  throw new Exception("av_frame_alloc() error: Could not allocate audio frame.");
              }
              frame.pts(0); // magic required by libvorbis and webm
  
              AVDictionary metadata = new AVDictionary(null);
              for (Entry<String, String> e : audioMetadata.entrySet()) {
                  av_dict_set(metadata, e.getKey(), e.getValue(), 0);
              }
              audio_st.metadata(metadata);
          }
  
          /* open the output file, if needed */
          if ((oformat.flags() & AVFMT_NOFILE) == 0) {
              AVIOContext pb = new AVIOContext(null);
              if ((ret = avio_open(pb, filename, AVIO_FLAG_WRITE)) < 0) {
                  release();
                  throw new Exception("avio_open error() error " + ret + ": Could not open '" + filename + "'");
              }
              oc.pb(pb);
          }
  
          AVDictionary options = new AVDictionary(null);
          for (Entry<String, String> e : this.options.entrySet()) {
              av_dict_set(options, e.getKey(), e.getValue(), 0);
          }
          AVDictionary metadata = new AVDictionary(null);
          for (Entry<String, String> e : this.metadata.entrySet()) {
              av_dict_set(metadata, e.getKey(), e.getValue(), 0);
          }
          /* write the stream header, if any */
          avformat_write_header(oc.metadata(metadata), options);
          av_dict_free(options);
      }
  
      public void stop() throws Exception {
          if (oc != null) {
              try {
                  /* flush all the buffers */
                  while (video_st != null  && ifmt_ctx == null && recordImage(0, 0, 0, 0, 0, AV_PIX_FMT_NONE, (Buffer[])null));
                  while (audio_st != null && ifmt_ctx == null && recordSamples(0, 0, (Buffer[])null));
  
                  if (interleaved && video_st != null && audio_st != null) {
                      av_interleaved_write_frame(oc, null);
                  } else {
                      av_write_frame(oc, null);
                  }
  
                  /* write the trailer, if any */
                  av_write_trailer(oc);
              } finally {
                  release();
              }
          }
      }
  
      @Override public void record(Frame frame) throws Exception {
          record(frame, AV_PIX_FMT_NONE);
      }
      public void record(Frame frame, int pixelFormat) throws Exception {
          if (frame == null || (frame.image == null && frame.samples == null)) {
              recordImage(0, 0, 0, 0, 0, pixelFormat, (Buffer[])null);
          } else {
              if (frame.image != null) {
                  frame.keyFrame = recordImage(frame.imageWidth, frame.imageHeight, frame.imageDepth,
                          frame.imageChannels, frame.imageStride, pixelFormat, frame.image);
              }
              if (frame.samples != null) {
                  frame.keyFrame = recordSamples(frame.sampleRate, frame.audioChannels, frame.samples);
              }
          }
      }
  
      public boolean recordImage(int width, int height, int depth, int channels, int stride, int pixelFormat, Buffer ... image) throws Exception {
          if (video_st == null) {
              throw new Exception("No video output stream (Is imageWidth > 0 && imageHeight > 0 and has start() been called?)");
          }
          int ret;
  
          if (image == null || image.length == 0) {
              /* no more frame to compress. The codec has a latency of a few
                 frames if using B frames, so we get the last frames by
                 passing the same picture again */
          } else {
              int step = stride * Math.abs(depth) / 8;
              BytePointer data = image[0] instanceof ByteBuffer
                      ? new BytePointer((ByteBuffer)image[0].position(0))
                      : new BytePointer(new Pointer(image[0].position(0)));
  
              if (pixelFormat == AV_PIX_FMT_NONE) {
                  if ((depth == Frame.DEPTH_UBYTE || depth == Frame.DEPTH_BYTE) && channels == 3) {
                      pixelFormat = AV_PIX_FMT_BGR24;
                  } else if ((depth == Frame.DEPTH_UBYTE || depth == Frame.DEPTH_BYTE) && channels == 1) {
                      pixelFormat = AV_PIX_FMT_GRAY8;
                  } else if ((depth == Frame.DEPTH_USHORT || depth == Frame.DEPTH_SHORT) && channels == 1) {
                      pixelFormat = ByteOrder.nativeOrder().equals(ByteOrder.BIG_ENDIAN) ?
                              AV_PIX_FMT_GRAY16BE : AV_PIX_FMT_GRAY16LE;
                  } else if ((depth == Frame.DEPTH_UBYTE || depth == Frame.DEPTH_BYTE) && channels == 4) {
                      pixelFormat = AV_PIX_FMT_RGBA;
                  } else if ((depth == Frame.DEPTH_UBYTE || depth == Frame.DEPTH_BYTE) && channels == 2) {
                      pixelFormat = AV_PIX_FMT_NV21; // Android's camera capture format
                      step = width;
                  } else {
                      throw new Exception("Could not guess pixel format of image: depth=" + depth + ", channels=" + channels);
                  }
              }
  
              if (video_c.pix_fmt() != pixelFormat || video_c.width() != width || video_c.height() != height) {
                  /* convert to the codec pixel format if needed */
                  img_convert_ctx = sws_getCachedContext(img_convert_ctx, width, height, pixelFormat,
                          video_c.width(), video_c.height(), video_c.pix_fmt(), SWS_BILINEAR,
                          null, null, (DoublePointer)null);
                  if (img_convert_ctx == null) {
                      throw new Exception("sws_getCachedContext() error: Cannot initialize the conversion context.");
                  }
                  avpicture_fill(new AVPicture(tmp_picture), data, pixelFormat, width, height);
                  avpicture_fill(new AVPicture(picture), picture_buf, video_c.pix_fmt(), video_c.width(), video_c.height());
                  tmp_picture.linesize(0, step);
                  tmp_picture.format(pixelFormat);
                  tmp_picture.width(width);
                  tmp_picture.height(height);
                  picture.format(video_c.pix_fmt());
                  picture.width(video_c.width());
                  picture.height(video_c.height());
                  sws_scale(img_convert_ctx, new PointerPointer(tmp_picture), tmp_picture.linesize(),
                          0, height, new PointerPointer(picture), picture.linesize());
              } else {
                  avpicture_fill(new AVPicture(picture), data, pixelFormat, width, height);
                  picture.linesize(0, step);
                  picture.format(pixelFormat);
                  picture.width(width);
                  picture.height(height);
              }
          }
  
          if ((oformat.flags() & AVFMT_RAWPICTURE) != 0) {
              if (image == null || image.length == 0) {
                  return false;
              }
              /* raw video case. The API may change slightly in the future for that? */
              av_init_packet(video_pkt);
              video_pkt.flags(video_pkt.flags() | AV_PKT_FLAG_KEY);
              video_pkt.stream_index(video_st.index());
              video_pkt.data(new BytePointer(picture));
              video_pkt.size(Loader.sizeof(AVPicture.class));
          } else {
              /* encode the image */
              av_init_packet(video_pkt);
              video_pkt.data(video_outbuf);
              video_pkt.size(video_outbuf_size);
              picture.quality(video_c.global_quality());
              if ((ret = avcodec_encode_video2(video_c, video_pkt, image == null || image.length == 0 ? null : picture, got_video_packet)) < 0) {
                  throw new Exception("avcodec_encode_video2() error " + ret + ": Could not encode video packet.");
              }
              picture.pts(picture.pts() + 1); // magic required by libx264
  
              /* if zero size, it means the image was buffered */
              if (got_video_packet[0] != 0) {
                  if (video_pkt.pts() != AV_NOPTS_VALUE) {
                      video_pkt.pts(av_rescale_q(video_pkt.pts(), video_c.time_base(), video_st.time_base()));
                  }
                  if (video_pkt.dts() != AV_NOPTS_VALUE) {
                      video_pkt.dts(av_rescale_q(video_pkt.dts(), video_c.time_base(), video_st.time_base()));
                  }
                  video_pkt.stream_index(video_st.index());
              } else {
                  return false;
              }
          }
  
          writePacket(AVMEDIA_TYPE_VIDEO, video_pkt);
          return image != null ? (video_pkt.flags() & AV_PKT_FLAG_KEY) != 0 : got_video_packet[0] != 0;
      }
  
      public boolean recordSamples(Buffer ... samples) throws Exception {
          return recordSamples(0, 0, samples);
      }
      public boolean recordSamples(int sampleRate, int audioChannels, Buffer ... samples) throws Exception {
          if (audio_st == null) {
              throw new Exception("No audio output stream (Is audioChannels > 0 and has start() been called?)");
          }
          int ret;
  
          if (sampleRate <= 0) {
              sampleRate = audio_c.sample_rate();
          }
          if (audioChannels <= 0) {
              audioChannels = audio_c.channels();
          }
          int inputSize = samples != null ? samples[0].limit() - samples[0].position() : 0;
          int inputFormat = AV_SAMPLE_FMT_NONE;
          int inputChannels = samples != null && samples.length > 1 ? 1 : audioChannels;
          int inputDepth = 0;
          int outputFormat = audio_c.sample_fmt();
          int outputChannels = samples_out.length > 1 ? 1 : audio_c.channels();
          int outputDepth = av_get_bytes_per_sample(outputFormat);
          if (samples != null && samples[0] instanceof ByteBuffer) {
              inputFormat = samples.length > 1 ? AV_SAMPLE_FMT_U8P : AV_SAMPLE_FMT_U8;
              inputDepth = 1;
              for (int i = 0; i < samples.length; i++) {
                  ByteBuffer b = (ByteBuffer)samples[i];
                  if (samples_in[i] instanceof BytePointer && samples_in[i].capacity() >= inputSize && b.hasArray()) {
                      ((BytePointer)samples_in[i]).position(0).put(b.array(), b.position(), inputSize);
                  } else {
                      samples_in[i] = new BytePointer(b);
                  }
              }
          } else if (samples != null && samples[0] instanceof ShortBuffer) {
              inputFormat = samples.length > 1 ? AV_SAMPLE_FMT_S16P : AV_SAMPLE_FMT_S16;
              inputDepth = 2;
              for (int i = 0; i < samples.length; i++) {
                  ShortBuffer b = (ShortBuffer)samples[i];
                  if (samples_in[i] instanceof ShortPointer && samples_in[i].capacity() >= inputSize && b.hasArray()) {
                      ((ShortPointer)samples_in[i]).position(0).put(b.array(), samples[i].position(), inputSize);
                  } else {
                      samples_in[i] = new ShortPointer(b);
                  }
              }
          } else if (samples != null && samples[0] instanceof IntBuffer) {
              inputFormat = samples.length > 1 ? AV_SAMPLE_FMT_S32P : AV_SAMPLE_FMT_S32;
              inputDepth = 4;
              for (int i = 0; i < samples.length; i++) {
                  IntBuffer b = (IntBuffer)samples[i];
                  if (samples_in[i] instanceof IntPointer && samples_in[i].capacity() >= inputSize && b.hasArray()) {
                      ((IntPointer)samples_in[i]).position(0).put(b.array(), samples[i].position(), inputSize);
                  } else {
                      samples_in[i] = new IntPointer(b);
                  }
              }
          } else if (samples != null && samples[0] instanceof FloatBuffer) {
              inputFormat = samples.length > 1 ? AV_SAMPLE_FMT_FLTP : AV_SAMPLE_FMT_FLT;
              inputDepth = 4;
              for (int i = 0; i < samples.length; i++) {
                  FloatBuffer b = (FloatBuffer)samples[i];
                  if (samples_in[i] instanceof FloatPointer && samples_in[i].capacity() >= inputSize && b.hasArray()) {
                      ((FloatPointer)samples_in[i]).position(0).put(b.array(), b.position(), inputSize);
                  } else {
                      samples_in[i] = new FloatPointer(b);
                  }
              }
          } else if (samples != null && samples[0] instanceof DoubleBuffer) {
              inputFormat = samples.length > 1 ? AV_SAMPLE_FMT_DBLP : AV_SAMPLE_FMT_DBL;
              inputDepth = 8;
              for (int i = 0; i < samples.length; i++) {
                  DoubleBuffer b = (DoubleBuffer)samples[i];
                  if (samples_in[i] instanceof DoublePointer && samples_in[i].capacity() >= inputSize && b.hasArray()) {
                      ((DoublePointer)samples_in[i]).position(0).put(b.array(), b.position(), inputSize);
                  } else {
                      samples_in[i] = new DoublePointer(b);
                  }
              }
          } else if (samples != null) {
              throw new Exception("Audio samples Buffer has unsupported type: " + samples);
          }
  
          if (samples_convert_ctx == null || samples_channels != audioChannels || samples_format != inputFormat || samples_rate != sampleRate) {
              samples_convert_ctx = swr_alloc_set_opts(samples_convert_ctx, audio_c.channel_layout(), outputFormat, audio_c.sample_rate(),
                      av_get_default_channel_layout(audioChannels), inputFormat, sampleRate, 0, null);
              if (samples_convert_ctx == null) {
                  throw new Exception("swr_alloc_set_opts() error: Cannot allocate the conversion context.");
              } else if ((ret = swr_init(samples_convert_ctx)) < 0) {
                  throw new Exception("swr_init() error " + ret + ": Cannot initialize the conversion context.");
              }
              samples_channels = audioChannels;
              samples_format = inputFormat;
              samples_rate = sampleRate;
          }
  
          for (int i = 0; samples != null && i < samples.length; i++) {
              samples_in[i].position(samples_in[i].position() * inputDepth).
                      limit((samples_in[i].position() + inputSize) * inputDepth);
          }
          while (true) {
              int inputCount = (int)Math.min(samples != null ? (samples_in[0].limit() - samples_in[0].position()) / (inputChannels * inputDepth) : 0, Integer.MAX_VALUE);
              int outputCount = (int)Math.min((samples_out[0].limit() - samples_out[0].position()) / (outputChannels * outputDepth), Integer.MAX_VALUE);
              inputCount = Math.min(inputCount, (outputCount * sampleRate + audio_c.sample_rate() - 1) / audio_c.sample_rate());
              for (int i = 0; samples != null && i < samples.length; i++) {
                  samples_in_ptr.put(i, samples_in[i]);
              }
              for (int i = 0; i < samples_out.length; i++) {
                  samples_out_ptr.put(i, samples_out[i]);
              }
              if ((ret = swr_convert(samples_convert_ctx, samples_out_ptr, outputCount, samples_in_ptr, inputCount)) < 0) {
                  throw new Exception("swr_convert() error " + ret + ": Cannot convert audio samples.");
              } else if (ret == 0) {
                  break;
              }
              for (int i = 0; samples != null && i < samples.length; i++) {
                  samples_in[i].position(samples_in[i].position() + inputCount * inputChannels * inputDepth);
              }
              for (int i = 0; i < samples_out.length; i++) {
                  samples_out[i].position(samples_out[i].position() + ret * outputChannels * outputDepth);
              }
  
              if (samples == null || samples_out[0].position() >= samples_out[0].limit()) {
                  frame.nb_samples(audio_input_frame_size);
                  avcodec_fill_audio_frame(frame, audio_c.channels(), outputFormat, samples_out[0], (int)Math.min(samples_out[0].limit(), Integer.MAX_VALUE), 0);
                  for (int i = 0; i < samples_out.length; i++) {
                      frame.data(i, samples_out[i].position(0));
                      frame.linesize(i, (int)Math.min(samples_out[i].limit(), Integer.MAX_VALUE));
                  }
                  frame.quality(audio_c.global_quality());
                  record(frame);
              }
          }
          return samples != null ? frame.key_frame() != 0 : record((AVFrame)null);
      }
  
      boolean record(AVFrame frame) throws Exception {
          int ret;
  
          av_init_packet(audio_pkt);
          audio_pkt.data(audio_outbuf);
          audio_pkt.size(audio_outbuf_size);
          if ((ret = avcodec_encode_audio2(audio_c, audio_pkt, frame, got_audio_packet)) < 0) {
              throw new Exception("avcodec_encode_audio2() error " + ret + ": Could not encode audio packet.");
          }
          if (frame != null) {
              frame.pts(frame.pts() + frame.nb_samples()); // magic required by libvorbis and webm
          }
          if (got_audio_packet[0] != 0) {
              if (audio_pkt.pts() != AV_NOPTS_VALUE) {
                  audio_pkt.pts(av_rescale_q(audio_pkt.pts(), audio_c.time_base(), audio_st.time_base()));
              }
              if (audio_pkt.dts() != AV_NOPTS_VALUE) {
                  audio_pkt.dts(av_rescale_q(audio_pkt.dts(), audio_c.time_base(), audio_st.time_base()));
              }
              audio_pkt.flags(audio_pkt.flags() | AV_PKT_FLAG_KEY);
              audio_pkt.stream_index(audio_st.index());
          } else {
              return false;
          }
  
          /* write the compressed frame in the media file */
          writePacket(AVMEDIA_TYPE_AUDIO, audio_pkt);
  
          return true;
      }
  
      private void writePacket(int mediaType, AVPacket avPacket) throws Exception {
  
          AVStream avStream = (mediaType == AVMEDIA_TYPE_VIDEO) ? audio_st : (mediaType == AVMEDIA_TYPE_AUDIO) ? video_st : null;
          String mediaTypeStr = (mediaType == AVMEDIA_TYPE_VIDEO) ? "video" : (mediaType == AVMEDIA_TYPE_AUDIO) ? "audio" : "unsupported media stream type";
  
          synchronized (oc) {
              int ret;
              if (interleaved && avStream != null) {
                  if ((ret = av_interleaved_write_frame(oc, avPacket)) < 0) {
                      throw new Exception("av_interleaved_write_frame() error " + ret + " while writing interleaved " + mediaTypeStr + " packet.");
                  }
              } else {
                  if ((ret = av_write_frame(oc, avPacket)) < 0) {
                      throw new Exception("av_write_frame() error " + ret + " while writing " + mediaTypeStr + " packet.");
                  }
              }
          }
      }
  
      public boolean recordPacket(AVPacket pkt) throws Exception {
  
          if (pkt == null) {
              return false;
          }
  
          AVStream in_stream = ifmt_ctx.streams(pkt.stream_index());
  
          pkt.dts(AV_NOPTS_VALUE);
          pkt.pts(AV_NOPTS_VALUE);
          pkt.pos(-1);
  
          if (in_stream.codec().codec_type() == AVMEDIA_TYPE_VIDEO && video_st != null) {
  
              pkt.stream_index(video_st.index());
              pkt.duration((int) av_rescale_q(pkt.duration(), in_stream.codec().time_base(), video_st.codec().time_base()));
  
              writePacket(AVMEDIA_TYPE_VIDEO, pkt);
  
          } else if (in_stream.codec().codec_type() == AVMEDIA_TYPE_AUDIO && audio_st != null && (audioChannels > 0)) {
  
              pkt.stream_index(audio_st.index());
              pkt.duration((int) av_rescale_q(pkt.duration(), in_stream.codec().time_base(), audio_st.codec().time_base()));
  
              writePacket(AVMEDIA_TYPE_AUDIO, pkt);
          }
  
          av_free_packet(pkt);
  
          return true;
      }
  
  }
  