[vorbis] problems loading an ogg to memory

[Stan Seibert]

On Wed, 2003-09-03 at 12:16, Joel Gonzales wrote:
> This seems to be where I'm stuck at currently. What function do I call 
> to set the sample size?

>From the ov_read() documentation:

long ov_read(OggVorbis_File *vf, char *buffer, int length, int
bigendianp, int word, int sgned, int *bitstream);

[snip]

  word
    Specifies  word  size.  Possible  arguments  are  1  for  8-bit
    samples, or 2 or 16-bit samples. Typical value is 2.

So you actually don't make a specific function call to set the sample
size.  You just pass the size you want with every ov_read() call.

> Just to make sure my math is correct:
> if we have 200 PCM samples, 1 channel and a rate of 44100, that would give
> 200*1*44100 = 8820000 (assuming a file that isn't chained)
> 
> So I'd need an array of size 8820000? or is the number given in bits/bytes?

If your sound file is 200 PCM samples in length at a rate of 44100 with
only one channel, then the size of the array in bytes is 8820000*sample
size in bytes.  For example, assume you are decoding a file to 16-bit
integers.  You could declare the array to hold this in C in one of the
following two ways:

hort music[8820000];  /* Assumes shorts are 16 bit on your platform */

or 

char music[17640000];

If you decode to 8-bit integers, you can do:

char music[8820000];


---
Stan Seibert

<p>--- >8 ----
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