static void
send_ca_pmt (CamSwClient * client, GstStructure * pmt,
guint8 list_management, guint8 cmd_id)
{
guint8 *buffer;
guint buffer_size;
guint8 *ca_pmt;
guint ca_pmt_size;
guint length_field_len;
guint header_len;
ca_pmt = cam_build_ca_pmt (pmt, list_management, cmd_id, &ca_pmt_size);
length_field_len = cam_calc_length_field_size (ca_pmt_size);
header_len = 3 + length_field_len;
buffer_size = header_len + ca_pmt_size;
buffer = g_malloc0 (buffer_size);
memcpy (buffer + header_len, ca_pmt, ca_pmt_size);
/* ca_pmt resource_id */
buffer[0] = 0x9F;
buffer[1] = 0x80;
buffer[2] = 0x32;
cam_write_length_field (&buffer[3], ca_pmt_size);
if (write (client->sock, buffer, buffer_size) == -1) {
GST_WARNING ("write failed when sending pmt with errno: %d", errno);
}
g_free (ca_pmt);
g_free (buffer);
}
/* get the number of bytes to allocate for a TPDU with a body of body_length
* bytes. Also get the offset from the beginning of the buffer that marks the
* position of the first byte of the TPDU body */
void
cam_tl_calc_buffer_size (CamTL * tl, guint body_length,
guint * buffer_size, guint * offset)
{
guint length_field_len;
/* the size of a TPDU is:
* 1 byte slot number
* 1 byte connection id
* length_field_len bytes length field
* 1 byte connection id
* body_length bytes body
*/
/* get the length of the lenght_field block */
length_field_len = cam_calc_length_field_size (body_length);
*offset = 3 + length_field_len + 1;
*buffer_size = *offset + body_length;
}
