> static int seek(sox_format_t * ft, uint64_t offset)
> {
> priv_t * wav = (priv_t *) ft->priv;
>
> if (ft->encoding.bits_per_sample & 7)
> lsx_fail_errno(ft, SOX_ENOTSUP, "seeking not supported with this encoding");
> else if (wav->formatTag == WAVE_FORMAT_GSM610) {
> int alignment;
> size_t gsmoff;
>
> /* rounding bytes to blockAlign so that we
> * don't have to decode partial block. */
> gsmoff = offset * wav->blockAlign / wav->samplesPerBlock +
> wav->blockAlign * ft->signal.channels / 2;
> gsmoff -= gsmoff % (wav->blockAlign * ft->signal.channels);
>
> ft->sox_errno = lsx_seeki(ft, (off_t)(gsmoff + wav->dataStart), SEEK_SET);
> if (ft->sox_errno == SOX_SUCCESS) {
> /* offset is in samples */
> uint64_t new_offset = offset;
> alignment = offset % wav->samplesPerBlock;
> if (alignment != 0)
> new_offset += (wav->samplesPerBlock - alignment);
> wav->numSamples = ft->signal.length - (new_offset / ft->signal.channels);
> }
> } else {
> double wide_sample = offset - (offset % ft->signal.channels);
> double to_d = wide_sample * ft->encoding.bits_per_sample / 8;
> off_t to = to_d;
> ft->sox_errno = (to != to_d)? SOX_EOF : lsx_seeki(ft, (off_t)wav->dataStart + (off_t)to, SEEK_SET);
> if (ft->sox_errno == SOX_SUCCESS)
> wav->numSamples -= (size_t)wide_sample / ft->signal.channels;
> }
>
> return ft->sox_errno;
> }
>
>
> It seems you are right: wav->numSamples get decremented no matter what.
Hm, not true; but I don't understand the computation either.
Is the double there so that the integer count does not overflow?
And is that related to the problem you are seeing?
Jan
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