WAV file question

Hi Everyone-

I'm new to this group, and almost-as-new to asking programming
questions publicly, so please forgive me if I miss a convention or two!

I have a text file, around 40,000 lines long, where each line is a
string of 4 ASCII characters corresponding to a 12-bit hexadecimal
audio sample. The file reads something like this...

081F
081C
081A
0818
080E
etc...

I would like to write a simple C program in a Linux environment that
will read in this file, convert the strings to signed 2's-compliment
int samples, and output a simple WAV audio file. I've found several
resources on "The Canonical WAV format" via Google, and they describe
the format pretty well.

I already have a program reading in the file and fprintf'ing each line
out to stdout, as a stub. Now I need to build the WAV file.

Question #1: Am I reinventing the wheel? Does anyone know of another
piece of code out there that could do this out-of-the-box? I saw that
ogg123 seems to have a "raw" device option, but there doesn't seem to
be much documentation as to what it expects as a raw sample stream.

Question #2, for those familiar with WAV files: The WAV docs seem to
indicate that there can be only one DATA chunk in each WAV file. In a
DATA chunk, you get 4 bytes to give the size of your data... But what
if you have more data bytes than you can drop into an unsigned 4-byte
int?

Question #3, which is more C-language related: The WAV format uses
little-endian bit orders for all data, but the byte-order of several of
the multibyte (either 2-byte or 4-byte) variables is big-endian. So for
an int, the most-significant-byte would be stored in the first byte of
memory, the next-most-significant byte would follow it, and so on...
What is the byte order used by x86/gnu-linux? How can I flip around the
byte order of certain variables so that when I write out the WAV file,
the bytes are in the order the player expects??

Question #4: Do I have to do anything special to write out a binary
file as opposed to an ASCII text file? Can I just use fputc() to
iteratively drop the contents of the WAV chunk structs into a file? Do
I need to do anything at the top of the file to set the mime type?

Thanks in advance for your advice,
[medic]Dave

.

Relevant Pages

  • Re: WAV file question
    ... [ASCII to WAV converter] ... > indicate that there can be only one DATA chunk in each WAV file. ... which is more C-language related: The WAV format uses ... > file as opposed to an ASCII text file? ...
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    ... I have the wav format spec. ... > Ah Koh skrev: ... >> The problem is both method casues OUT OF MEMORY. ...
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    ... for those familiar with WAV files: ... # indicate that there can be only one DATA chunk in each WAV file. ... You can use fputc or fwrite. ... Presumably the mime type is decided by ...
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