Ejemplo n.º 1
0
        public override int ReadSample(byte[] buffer, int start, int count)
        {
            MultiplexedFrame fr = new MultiplexedFrame();

            fr.BitsInSample = streamInfo.BitsPerSample;
            fr.NumChannels = streamInfo.NumberOfChannels;
            fr.SampleCount = 0;
            fr.BitOffset = 0;
            fr.BufferUsed = 0;
            fr.Buffer = new byte[fr.NumChannels,count * (fr.BitsInSample / 8 + 1)];

            int sampleCount = 0;
            int samplesLeft = count;

            try
            {
                for (; ; )
                {
                    if(!frameDecoded)
                    {
                        currentFrame.Decode(physicalStream,flacStreamInfo);
                        frameDecoded = true;
                    }

                    int samplesToRead = 0;

                    if((ulong)samplesLeft > currentFrame.LastSampleNumber - currentSample + 1)
                    {
                        samplesToRead = (int) (currentFrame.LastSampleNumber - currentSample + 1);
                    }
                    else
                    {
                        samplesToRead = samplesLeft;
                    }

                    MultiplexFrame(currentFrame,fr,samplesToRead,currentSample);

                    samplesLeft -= samplesToRead;
                    currentSample += (ulong)samplesToRead;
                    sampleCount += samplesToRead;

                    if (samplesLeft > 0)
                    {
                        currentFrame.Decode(physicalStream, flacStreamInfo);
                        frameDecoded = true;
                    }

                    if (sampleCount == count)
                    {
                        break;
                    }
                }
            }
            catch (LostSynchronizationException)
            {
                if (AutoSyncronize)
                {
                    SynchronizeRight();
                }
            }
            catch (MalformedFileException)
            {
                if (AutoSyncronize)
                {
                    SynchronizeRight();
                }
            }
            catch (UnexpectedEndOfStreamException)
            {
                if (sampleCount == 0)
                {
                    sampleCount = -1;
                }
            }

            if (sampleCount != -1)
            {
                fr.ToByteArray(buffer, start);
            }

            return sampleCount;
        }
Ejemplo n.º 2
0
        private void MultiplexFrame(Frame fr, MultiplexedFrame mfr, int numSamples, ulong fromSample)
        {
            long startBuffer = mfr.BufferUsed;

            for (int chan = 0; chan < mfr.NumChannels; chan++)
            {
                mfr.BufferUsed = startBuffer;

                for (int sampleNum = 0; sampleNum < numSamples; sampleNum++)
                {
                    int sampleToMultiplex = fr.output[chan, sampleNum+(int)(fromSample-fr.FirstSampleNumber)];

                    int bitsLeft = streamInfo.BitsPerSample;
                    int bitsRead = 0;

                    while (bitsLeft > 0)
                    {
                        int bitsToAdd = 0;

                        if (bitsLeft > 8 - mfr.BitOffset)
                        {
                            bitsToAdd = 8 - mfr.BitOffset;
                        }
                        else
                        {
                            bitsToAdd = bitsLeft;
                        }

                        mfr.Buffer[chan, mfr.BufferUsed] |= //(byte)(((byte)(sampleToMultiplex << bitsRead)) >> (8 - bitsToAdd));
                            (byte)(sampleToMultiplex >> streamInfo.BitsPerSample - bitsRead - bitsToAdd);

                        bitsRead += bitsToAdd;
                        mfr.BitOffset += bitsToAdd;
                        bitsLeft -= bitsToAdd;

                        if (mfr.BitOffset == 8)
                        {
                            mfr.BufferUsed++;
                            mfr.BitOffset = 0;
                        }
                    }
                }
            }

            mfr.SampleCount += (ulong)numSamples;
        }