int raw1394_iso_xmit_sync(raw1394handle_t handle)
{
if (!handle) {
errno = EINVAL;
return -1;
}
if (handle->is_fw)
return fw_iso_xmit_sync(handle);
else
return ieee1394_iso_xmit_sync(handle->mode.ieee1394);
}
static int _iso_xmit_queue_packets(raw1394handle_t handle)
{
ieee1394handle_t ihandle = handle->mode.ieee1394;
struct raw1394_iso_status *stat = &ihandle->iso_status;
struct raw1394_iso_packets packets;
int retval = -1;
int stop_sync = 0;
if(ihandle->iso_mode != ISO_XMIT) {
errno = EINVAL;
goto out;
}
/* ensure stat->n_packets is sane */
if (stat->n_packets > stat->config.buf_packets)
stat->n_packets = stat->config.buf_packets;
/* we could potentially send up to stat->n_packets packets */
packets.n_packets = 0;
packets.infos = ihandle->iso_packet_infos;
if(packets.infos == NULL)
goto out;
while(stat->n_packets > 1) {
enum raw1394_iso_disposition disp;
unsigned int len;
struct raw1394_iso_packet_info *info = &packets.infos[packets.n_packets];
info->offset = ihandle->iso_buf_stride * ihandle->next_packet;
/* call handler */
disp = ihandle->iso_xmit_handler(handle,
ihandle->iso_buffer + info->offset,
&len,
&info->tag, &info->sy,
stat->xmit_cycle,
_iso_dropped(ihandle));
info->len = len;
/* advance packet cursors and cycle counter */
stat->n_packets--;
ihandle->next_packet = increment_and_wrap(ihandle->next_packet, stat->config.buf_packets);
if(stat->xmit_cycle != -1)
stat->xmit_cycle = increment_and_wrap(stat->xmit_cycle, 8000);
packets.n_packets++;
if(disp == RAW1394_ISO_DEFER) {
/* queue an event so that we don't hang in the next read() */
if(ioctl(ihandle->fd, RAW1394_IOC_ISO_QUEUE_ACTIVITY, 0))
goto out_produce;
break;
} else if(disp == RAW1394_ISO_AGAIN) {
/* the last packet was not ready, decrement counter */
packets.n_packets--;
/* queue an event so that we don't hang in the next read() */
if(ioctl(ihandle->fd, RAW1394_IOC_ISO_QUEUE_ACTIVITY, 0))
goto out_produce;
break;
} else if(disp == RAW1394_ISO_STOP) {
stop_sync = 1;
break;
} else if(disp == RAW1394_ISO_STOP_NOSYNC) {
ieee1394_iso_stop(ihandle);
break;
} else if(disp == RAW1394_ISO_ERROR) {
goto out_produce;
}
}
/* success */
retval = 0;
out_produce:
if(packets.n_packets > 0) {
if(ioctl(ihandle->fd, RAW1394_IOC_ISO_XMIT_PACKETS, &packets))
retval = -1;
}
out:
if(stop_sync) {
if(ieee1394_iso_xmit_sync(ihandle))
return -1;
ieee1394_iso_stop(ihandle);
}
return retval;
}
