static int write_header(sox_format_t * ft)
{
char * comment = lsx_cat_comments(ft->oob.comments);
size_t len = min(FIXED_HDR - 26, strlen(comment)) + 1; /* null-terminated */
size_t info_len = max(4, (len + 3) & ~3u); /* Minimum & multiple of 4 bytes */
int i = ft->encoding.reverse_bytes == MACHINE_IS_BIGENDIAN? 0 : 2;
sox_bool error = sox_false
||lsx_writechars(ft, id[i].str, sizeof(id[i].str))
||lsx_writef(ft, ft->signal.rate)
||lsx_writedw(ft, ft->signal.channels)
||lsx_writedw(ft, ft_enc(ft->encoding.bits_per_sample, ft->encoding.encoding))
||lsx_writew(ft, SF_COMMENT)
||lsx_writew(ft, (unsigned) info_len)
||lsx_writechars(ft, comment, len)
||lsx_padbytes(ft, FIXED_HDR - 20 - len);
free(comment);
return error? SOX_EOF: SOX_SUCCESS;
}
static void start(sox_format_t * ft)
{
priv_t * sf = (priv_t *)ft->priv;
int subtype = ft_enc(ft->encoding.bits_per_sample? ft->encoding.bits_per_sample : ft->signal.precision, ft->encoding.encoding);
sf->log_buffer_ptr = sf->log_buffer = lsx_malloc((size_t)LOG_MAX);
sf->sf_info = lsx_calloc(1, sizeof(SF_INFO));
/* Copy format info */
if (subtype) {
if (strcmp(ft->filetype, "sndfile") == 0)
sf->sf_info->format = name_to_format(ft->filename) | subtype;
else
sf->sf_info->format = name_to_format(ft->filetype) | subtype;
}
sf->sf_info->samplerate = ft->signal.rate;
sf->sf_info->channels = ft->signal.channels;
if (ft->signal.channels)
sf->sf_info->frames = ft->signal.length / ft->signal.channels;
}