示例#1
0
        private void BufferProc(object o)
        {
            var resetEvent = o as EventWaitHandle;

            try
            {
                if (_stream == null || _stream.CanRead == false)
                {
                    throw new Exception("Mp3WebStream not initialized");
                }

                byte[] buffer = null;
                int    read;

                Mp3Format format, prevFormat;
                Mp3Frame  frame;

                read   = ReadRawDataFromFrame(ref buffer, out frame);
                format = new Mp3Format(frame.SampleRate, frame.ChannelCount, frame.FrameLength,
                                       frame.BitRate);

                _buffer = new FixedSizeBuffer <byte>(format.BytesPerSecond * 2);

                do
                {
                    _buffer.Write(buffer, 0, read);
                    read       = ReadRawDataFromFrame(ref buffer, out frame);
                    prevFormat = format;
                    format     = new Mp3Format(frame.SampleRate, frame.ChannelCount, frame.FrameLength,
                                               frame.BitRate);
                } while (_buffer.Buffered < _buffer.Length / 10 || !format.Equals(prevFormat));

                if (resetEvent != null)
                {
                    resetEvent.Set();
                }

                do
                {
                    Debug.WriteLine("Buffering");
                    if (_buffer.Buffered >= _buffer.Length * 0.85 && !_disposing)
                    {
                        Thread.Sleep(250);
                    }
                    else
                    {
                        _buffer.Write(buffer, 0, read);
                        read = ReadRawDataFromFrame(ref buffer, out frame);
                    }
                } while (!_disposing);
            }
            finally
            {
                if (resetEvent != null)
                {
                    resetEvent.Set();
                }
            }
        }
示例#2
0
        private void ParseForMp3Frames(Stream stream, bool enableSeeking)
        {
            Mp3Frame frame = null;
            long     offsetOfFirstFrame = 0;

            stream = new BufferedStream(stream);

            if (enableSeeking)
            {
                while (ID3v2.SkipTag(stream))
                {
                    /* skip all id3 tags (see https://github.com/filoe/cscore/issues/63)
                     * there are some files with multiple id3v2 tags
                     * not sure whether this is according to the id3 specification but we have to handle it anyway
                     * as long as the SkipTag method returns true, another id3 tag has been found
                     */
                }
            }

            while (frame == null)
            {
                if (enableSeeking && stream.IsEndOfStream())
                {
                    break;
                }

                if (enableSeeking)
                {
                    offsetOfFirstFrame = stream.Position;
                }
                frame = Mp3Frame.FromStream(stream);
            }

            if (frame == null)
            {
                throw new Exception("Could not find any MP3-Frames in the stream.");
            }

            if (enableSeeking)
            {
                XingHeader xingHeader = XingHeader.FromFrame(frame);
                if (xingHeader != null)
                {
                    offsetOfFirstFrame = stream.Position;
                }
            }
            _inputFormat = new Mp3Format(frame.SampleRate, frame.ChannelCount, frame.FrameLength, frame.BitRate);

            //Prescan stream
            if (enableSeeking)
            {
                _frameInfoCollection = new FrameInfoCollection();
                while (_frameInfoCollection.AddFromMp3Stream(stream))
                {
                }

                stream.Position = offsetOfFirstFrame;
            }
        }