adpcm | Sound chip ADPCM codec library | Audio Utils library

I am trying to read correctly a WAVE file, PCM, mono, 16 bits (2 bytes per sample). I have managed to read the header. The problem is reading (writing) the data part.

As far as I understand the 16-bit samples in the data chunk are little-endian, and "split" into two chunks of 8 bits each. So for me a way to read the correct data should be:

1. Read file and put chunks into two differentint8_t variables (or a std::vector..)
2. In some way "join" these two variables to make a int16_t and being able to process it.

The problem is I have no idea on how to deal with the little-endianness and the fact that these samples aren't unsigned, so I can't use the << operator.

This is one of the test I've done, without success:

There are telephone communication systems as follows.

Among these, I am going to develop a repeater. The repeater performs tcp/ip communication.

Receive adpcm data in bytes from user1 and user2, respectively.

I want to save the data received from the repeater as an audio file.

Once the data from one side (user1) was collected and made into a byte array, I created a wav file using Naudio, but it failed.

When I play it using the default playback app of window10, it plays for about 1 second and ends. However, the total playing time is longer, such as 6 seconds and 7 seconds.

The data below is a part from the beginning of the binary data of the wav file I created.

52 49 46 46 B4 65 00 00 57 41 56 45 66 6D 74 20 32 00 00 00 02 00 01 00 40 1F 00 00 00 10 00 00 00 01 04 00 20 00 F4 01 07 00 00 01 00 00 00 02 00 FF 00 00 00 00 C0 00 40 00 F0 00 00 00 CC 01 30 FF 88 01 18 FF 66 61 63 74 04 00 00 00 C4 CA 00 00 64 61 74 61 62 65 00 00 77 77 77 68 08 08 08 08 08 08 08 08 08 08 80 08 08 9A 99 99 90 01 21 21 12 25 53 40 9A B9 91 24 34 11 8A BC AA 80 13 17 43 42 12 09 8A AB DB BB BA 9A 88 12 02 A0 BA BB DB A9 8A 01 33 33 31 10 1A 0B BB BA A0 91 22 32 11 90 A9 BB BB 9B 11 23 33 41 11 19 9B AB B9 11 22 13 35 11 08 99 AA BC A1 A1 00 31 31 11 A9 0A AB BB 9A 10 13 14 12 91 90 9B 9B B9 A0 11 13 41 29 29 09 9B AB B9 09 10 13 33 11 A9 BB BB CA 09 00 12 33 33 39 39 1A AA B9 B1 91 22 33 40 01 90 A9 BC A9 99 01 31 41 01 9A 9B 9C 9A 9A 90 01 33 33 21 01 09 9B A9 90 11 11 33 33 21 01 0A 9B 9A 99 01 03 14 10 19 99 B9 BB BA B0 90 12 33 11 20 91 A9 99 9A 01 02 11 33 01 10 09 99 B0 A0 10 12 13 31 29 99 9B 9A B0 99 90 01 11 21 90 91 09 19 09 10 90 12 03 19 19 19 09 99 19 99 00 11 13 10 90 99 BA B9 B0 99 00 01 91 00 99 11 99 00 11 01 11 11 11 19 99 11 91 91 11 00 10 01 20 01 90 99 AA 9A 99 01 91 99 9A 9A 99 19 01 10 11 11 21 11 3A 09 99 90 00 31 11 19 10 91 91 11 01 9A

Here is the code I implemented(audiodata is byte array of adpcmdata):

I have a file with no header with IMA ADPCM raw data stored, I would like to play it using NAudio. In Audacity, using this config plays without problems: