Example #1
0
        public static void ADPCM2Wav(byte[] data, int sampleRate, Stream output)
        {
            RiffTags riff = new RiffTags()
            {
                FileType = "WAVE",
            };

            byte[]  adpcm      = new byte[data.Length];
            short[] wavSamples = new short[data.Length * 2];
            Buffer.BlockCopy(data, 0, adpcm, 0, data.Length);

            ADPCM2PCM2(wavSamples, 0, adpcm, 0);

            /*Deinterleave(adpcm);
             * ADPCM2PCM(wavSamples, 0, adpcm, 0, adpcm.Length / 2);
             * ADPCM2PCM(wavSamples, wavSamples.Length / 2, adpcm, adpcm.Length / 2, adpcm.Length / 2);
             * Interleave(wavSamples);*/

            byte[] wavData = new byte[wavSamples.Length * sizeof(short)];
            Buffer.BlockCopy(wavSamples, 0, wavData, 0, wavData.Length);

            WaveFmt fmt = new WaveFmt {
                Format        = 1,
                Channels      = 2,
                SampleRate    = sampleRate * 1,
                BitsPerSample = 16,
            };

            fmt.UpdateValues();
            riff["fmt "] = new RiffTag("fmt ", fmt.ToBytes());
            riff["data"] = new RiffTag("data", wavData);
            riff.Save(output);
        }
Example #2
0
        public static void ADPCM2Wav(Stream input, Stream output)
        {
            RiffTags riff = new RiffTags(input);

            // Remove unnecissary tags
            foreach (string key in riff.Keys.ToArray())
            {
                if (key != "fmt " && key != "data")
                {
                    riff.Remove(key);
                }
            }

            if (riff.FileType != "WAVE")
            {
                throw new Exception("Input is not a WAVE file!");
            }

            WaveFmt fmt = WaveFmt.Read(riff["fmt "].Data);

            if (fmt.Format != 20)
            {
                throw new Exception("Input is not ADPCM format!");
            }
            if (fmt.Channels != 2)
            {
                throw new Exception("Input does not have 2 channels!");
            }
            if (fmt.BitsPerSample != 4)
            {
                throw new Exception("Input does not have 4 bits per sample!");
            }

            byte[]  data       = riff["data"].Data;
            byte[]  adpcm      = new byte[data.Length];
            short[] wavSamples = new short[data.Length * 2];
            Buffer.BlockCopy(data, 0, adpcm, 0, data.Length);

            ADPCM2PCM2(wavSamples, 0, adpcm, 0);
            ADPCM2PCM(wavSamples, 0, adpcm, 0, adpcm.Length / 2);
            ADPCM2PCM(wavSamples, wavSamples.Length / 2, adpcm, adpcm.Length / 2, adpcm.Length / 2);
            //Interleave(wavSamples);

            byte[] wavData = new byte[wavSamples.Length * sizeof(short)];
            Buffer.BlockCopy(wavSamples, 0, wavData, 0, wavData.Length);

            fmt.Format        = 1;
            fmt.BitsPerSample = 16;
            fmt.UpdateValues();
            riff["fmt "] = new RiffTag("fmt ", fmt.ToBytes());
            riff["data"] = new RiffTag("data", wavData);
            riff.Save(output);
        }
Example #3
0
        public static bool MaximizeWavVolume(string inputFile, out string outputFile)
        {
            RiffTags riff = new RiffTags(inputFile);

            // Remove unnecissary tags
            foreach (string key in riff.Keys.ToArray())
            {
                if (key != "fmt " && key != "data")
                {
                    riff.Remove(key);
                }
            }

            if (riff.FileType != "WAVE")
            {
                throw new Exception("Input is not a WAVE file!");
            }

            WaveFmt fmt = WaveFmt.Read(riff["fmt "].Data);

            if (fmt.Format != 1)
            {
                throw new Exception("Input is not PCM format!");
            }
            if (fmt.Channels != 2)
            {
                throw new Exception("Input does not have 2 channels!");
            }
            if (fmt.BitsPerSample != 16)
            {
                throw new Exception("Input does not have 16 bits per sample!");
            }
            if (fmt.SampleRate > 5000)
            {
                throw new Exception("Sample rate must be 5000Hz or less!");
            }

            byte[]  data       = riff["data"].Data;
            short[] wavSamples = new short[data.Length / 2];
            Buffer.BlockCopy(data, 0, wavSamples, 0, data.Length);

            short max = 0;
            short min = 0;

            for (int i = 0; i < wavSamples.Length; i++)
            {
                max = Math.Max(max, wavSamples[i]);
                min = Math.Min(min, wavSamples[i]);
            }

            // Silent File
            if (min == 0 && max == 0)
            {
                outputFile = inputFile;
                return(false);
            }

            // Lazy maximum volume checking
            const short range = 32;

            if (min <= (short.MinValue + range) || max >= (short.MaxValue - range))
            {
                outputFile = inputFile;
                return(false);
            }

            double maxScale = (double)short.MaxValue / max;
            double minScale = (double)short.MinValue / min;
            double scale    = Math.Min(maxScale, minScale);

            for (int i = 0; i < wavSamples.Length; i++)
            {
                wavSamples[i] = (short)(wavSamples[i] * scale);
            }

            byte[] wavData = new byte[wavSamples.Length * sizeof(short)];
            Buffer.BlockCopy(wavSamples, 0, wavData, 0, wavData.Length);

            outputFile   = Path.Combine(Directory.GetCurrentDirectory(), "wiimote.maximized.wav");
            riff["data"] = new RiffTag("data", wavData);
            riff.Save(outputFile);
            return(false);
        }