tkaczenko / wavreader

Read wav header and data from the files (.wav)

WavReader

Console utilities for reading wave format (.wav) header and data written in C++, C++/Qt, Java.

Includes

• WavReader.cpp - written in C++
• WavReaderQt.cpp - written in QT
• MetaReader.java - written in Java

The header of a WAV file

![here] (/wav-sound-format.gif "WAV header")

• The "RIFF" chunk descriptor:

  1-4 "RIFF" Marks the file as a riff file. Characters are each 1 byte long

  5-8 File size (integer) Size of the overall file - 8 bytes, in bytes (32-bit integer).

  9-12 "WAVE" File Type Header. For our purposes, it always equals "WAVE".

• The "fmt" sub-chunk:

  13-16 "fmt " Format chunk marker. Includes trailing null

  17-20 16 Length of format data as listed above

  23-24 2 Number of Channels - 2 byte integer

  25-28 44100 Sample Rate - 32 byte integer. CSample Rate = Number of Samples per second, or Hertz.

  29-32 176400 (Sample Rate * BitsPerSample * Channels) / 8. Byte rate

  33-34 4 (BitsPerSample * Channels) / 8.1 - 8 bit mono2 - 8 bit stereo/16 bit mono4 - 16 bit stereo

  35-36 16 Bits per sample

• The "data" sub-chunk:

  37-40 "data" Marks the beginning of the data section.

  41-44 File size (data) Size of the data section.

  44-.. Data samples

The file could have another sub-chunks.

wavreader's Issues

Only works for subchunk1Size = 16

The code appears to only work for subchunk1Size = 16. However, for newer wav files subchunk1Size = 18

https://stackoverflow.com/a/24078190/11998382

This appears to have been addressed here then commented out.

WavReader/WavReader/WavReader.cpp

Line 89 in 83faf9a

//fseek(f, header.chunkSize - 16, SEEK_CUR);

Just a heads up.

WavReader_Java: toInt conversion bug

WavReader.toInt(int start, boolean endian) yields the wrong sample rate. I would suggest following fix:

    private int toInt(int start, boolean endian) {
        int k = (endian) ? 1 : -1;
        if (!endian) {
            start += 3;
        }

        return ((buf[start] & 0xFF) << 24) |
                ((buf[start + k] & 0xFF) << 16) |
                ((buf[start + k * 2] & 0xFF) << 8) |
                (buf[start + k * 3] & 0xFF);
    }

WavReader.cpp: A memory leak bug

in line 110 short int *value = new short int[samples_count];
but you don't delete it