Ejemplo n.º 1
0
        private void StreamMP3(object state)
        {
            this.fullyDownloaded = false;
            string url = (string)state;
            webRequest = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse resp = null;
            try
            {
                resp = (HttpWebResponse)webRequest.GetResponse();
            }
            catch(WebException e)
            {
                if (e.Status != WebExceptionStatus.RequestCanceled)
                {
                    ShowError(e.Message);
                }
                return;
            }
            byte[] buffer = new byte[16384 * 4]; // needs to be big enough to hold a decompressed frame

            IMp3FrameDecompressor decompressor = null;
            try
            {
                using (var responseStream = resp.GetResponseStream())
                {
                    var readFullyStream = new ReadFullyStream(responseStream);
                    do
                    {
                        if (bufferedWaveProvider != null && bufferedWaveProvider.BufferLength - bufferedWaveProvider.BufferedBytes < bufferedWaveProvider.WaveFormat.AverageBytesPerSecond / 4)
                        {
                            Debug.WriteLine("Buffer getting full, taking a break");
                            Thread.Sleep(500);
                        }
                        else
                        {
                            Mp3Frame frame = null;
                            try
                            {
                                frame = Mp3Frame.LoadFromStream(readFullyStream);
                            }
                            catch (EndOfStreamException)
                            {
                                this.fullyDownloaded = true;
                                // reached the end of the MP3 file / stream
                                break;
                            }
                            catch (WebException)
                            {
                                // probably we have aborted download from the GUI thread
                                break;
                            }
                            if (decompressor == null)
                            {
                                // don't think these details matter too much - just help ACM select the right codec
                                // however, the buffered provider doesn't know what sample rate it is working at
                                // until we have a frame
                                WaveFormat waveFormat = new Mp3WaveFormat(frame.SampleRate, frame.ChannelMode == ChannelMode.Mono ? 1 : 2, frame.FrameLength, frame.BitRate);
                                decompressor = new AcmMp3FrameDecompressor(waveFormat);
                                this.bufferedWaveProvider = new BufferedWaveProvider(decompressor.OutputFormat);
                                this.bufferedWaveProvider.BufferDuration = TimeSpan.FromSeconds(20); // allow us to get well ahead of ourselves
                                //this.bufferedWaveProvider.BufferedDuration = 250;
                            }
                            int decompressed = decompressor.DecompressFrame(frame, buffer, 0);
                            //Debug.WriteLine(String.Format("Decompressed a frame {0}", decompressed));
                            bufferedWaveProvider.AddSamples(buffer, 0, decompressed);
                        }

                    } while (playbackState != StreamingPlaybackState.Stopped);
                    Debug.WriteLine("Exiting");
                    // was doing this in a finally block, but for some reason
                    // we are hanging on response stream .Dispose so never get there
                    decompressor.Dispose();
                }
            }
            finally
            {
                if (decompressor != null)
                {
                    decompressor.Dispose();
                }
            }
        }
Ejemplo n.º 2
0
        private void StreamMp3(object state)
        {
            fullyDownloaded = false;
            var url = (string)state;

            webRequest = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse resp;

            try
            {
                resp = (HttpWebResponse)webRequest.GetResponse();
            }
            catch (WebException e)
            {
                if (e.Status != WebExceptionStatus.RequestCanceled)
                {
                    ShowError(e.Message);
                }
                return;
            }
            var buffer = new byte[16384 * 4]; // needs to be big enough to hold a decompressed frame

            IMp3FrameDecompressor decompressor = null;

            try
            {
                using (var responseStream = resp.GetResponseStream())
                {
                    var readFullyStream = new ReadFullyStream(responseStream);
                    do
                    {
                        if (IsBufferNearlyFull)
                        {
                            Debug.WriteLine("Buffer getting full, taking a break");
                            Thread.Sleep(500);
                        }
                        else
                        {
                            Mp3Frame frame;
                            try
                            {
                                frame = Mp3Frame.LoadFromStream(readFullyStream);
                            }
                            catch (EndOfStreamException)
                            {
                                fullyDownloaded = true;
                                // reached the end of the MP3 file / stream
                                break;
                            }
                            catch (WebException)
                            {
                                // probably we have aborted download from the GUI thread
                                break;
                            }
                            if (decompressor == null)
                            {
                                // don't think these details matter too much - just help ACM select the right codec
                                // however, the buffered provider doesn't know what sample rate it is working at
                                // until we have a frame
                                decompressor         = CreateFrameDecompressor(frame);
                                bufferedWaveProvider = new BufferedWaveProvider(decompressor.OutputFormat);
                                bufferedWaveProvider.BufferDuration = TimeSpan.FromSeconds(20); // allow us to get well ahead of ourselves
                                //this.bufferedWaveProvider.BufferedDuration = 250;
                            }
                            int decompressed = decompressor.DecompressFrame(frame, buffer, 0);
                            //Debug.WriteLine(String.Format("Decompressed a frame {0}", decompressed));
                            bufferedWaveProvider.AddSamples(buffer, 0, decompressed);
                        }
                    } while (playbackState != StreamingPlaybackState.Stopped);
                    Debug.WriteLine("Exiting");
                    // was doing this in a finally block, but for some reason
                    // we are hanging on response stream .Dispose so never get there
                    decompressor.Dispose();
                }
            }
            finally
            {
                if (decompressor != null)
                {
                    decompressor.Dispose();
                }
            }
        }