static int check_header(FILE *f)
{
AU_HEADER(header);
u_int32_t magic;
u_int32_t hdr_size;
u_int32_t data_size;
u_int32_t encoding;
u_int32_t sample_rate;
u_int32_t channels;
if (fread(header, 1, AU_HEADER_SIZE, f) != AU_HEADER_SIZE)
{
cw_log(LOG_WARNING, "Read failed (header)\n");
return -1;
}
magic = ltohl(header[AU_HDR_MAGIC_OFF]);
if (magic != (u_int32_t) AU_MAGIC)
{
cw_log(LOG_WARNING, "Bad magic: 0x%x\n", magic);
}
/* hdr_size = ltohl(header[AU_HDR_HDR_SIZE_OFF]);
if (hdr_size < AU_HEADER_SIZE)*/
hdr_size = AU_HEADER_SIZE;
/* data_size = ltohl(header[AU_HDR_DATA_SIZE_OFF]); */
encoding = ltohl(header[AU_HDR_ENCODING_OFF]);
if (encoding != AU_ENC_8BIT_ULAW)
{
cw_log(LOG_WARNING, "Unexpected format: %d. Only 8bit ULAW allowed (%d)\n", encoding, AU_ENC_8BIT_ULAW);
return -1;
}
sample_rate = ltohl(header[AU_HDR_SAMPLE_RATE_OFF]);
if (sample_rate != 8000)
{
cw_log(LOG_WARNING, "Sample rate can only be 8000 not %d\n", sample_rate);
return -1;
}
channels = ltohl(header[AU_HDR_CHANNELS_OFF]);
if (channels != 1)
{
cw_log(LOG_WARNING, "Not in mono: channels=%d\n", channels);
return -1;
}
/* Skip to data */
fseek(f, 0, SEEK_END);
data_size = ftell(f) - hdr_size;
if (fseek(f, hdr_size, SEEK_SET) == -1)
{
cw_log(LOG_WARNING, "Failed to skip to data: %d\n", hdr_size);
return -1;
}
return data_size;
}
static int write_header(FILE *f)
{
AU_HEADER(header);
header[AU_HDR_MAGIC_OFF] = htoll((uint32_t) AU_MAGIC);
header[AU_HDR_HDR_SIZE_OFF] = htoll(AU_HEADER_SIZE);
header[AU_HDR_DATA_SIZE_OFF] = 0;
header[AU_HDR_ENCODING_OFF] = htoll(AU_ENC_8BIT_ULAW);
header[AU_HDR_SAMPLE_RATE_OFF] = htoll(DEFAULT_SAMPLE_RATE);
header[AU_HDR_CHANNELS_OFF] = htoll(1);
/* Write an au header, ignoring sizes which will be filled in later */
fseek(f, 0, SEEK_SET);
if (fwrite(header, 1, AU_HEADER_SIZE, f) != AU_HEADER_SIZE) {
ast_log(LOG_WARNING, "Unable to write header\n");
return -1;
}
return 0;
}
