dvb_demux.c

linux环境下的dvb驱动程序

			return -ENOMEM;
		}
#endif
	}
	
	feed->state = DMX_STATE_READY;
	up(&demux->mutex);

	return 0;
}


static int dmx_ts_feed_start_filtering(struct dmx_ts_feed* ts_feed)
{
	struct dvb_demux_feed *feed = (struct dvb_demux_feed *) ts_feed;
	struct dvb_demux *demux = feed->demux;
	int ret;

	if (down_interruptible (&demux->mutex))
		return -ERESTARTSYS;

	if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
		up(&demux->mutex);
		return -EINVAL;
	}

	if (!demux->start_feed) {
		up(&demux->mutex);
		return -ENODEV;
	}

	if ((ret = demux->start_feed(feed)) < 0) {
		up(&demux->mutex);
		return ret;
	}

	spin_lock_irq(&demux->lock);
	ts_feed->is_filtering = 1;
	feed->state = DMX_STATE_GO;
	spin_unlock_irq(&demux->lock);
	up(&demux->mutex);

	return 0;
}
 
static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed* ts_feed)
{
	struct dvb_demux_feed *feed = (struct dvb_demux_feed *) ts_feed;
	struct dvb_demux *demux = feed->demux;
	int ret;

	if (down_interruptible (&demux->mutex))
		return -ERESTARTSYS;

	if (feed->state < DMX_STATE_GO) {
		up(&demux->mutex);
		return -EINVAL;
	}

	if (!demux->stop_feed) {
		up(&demux->mutex);
		return -ENODEV;
	}

	ret = demux->stop_feed(feed); 

	spin_lock_irq(&demux->lock);
	ts_feed->is_filtering = 0;
	feed->state = DMX_STATE_ALLOCATED;
	spin_unlock_irq(&demux->lock);
	up(&demux->mutex);

	return ret;
}

static int dvbdmx_allocate_ts_feed (struct dmx_demux *dmx, struct dmx_ts_feed **ts_feed, 
			     dmx_ts_cb callback)
{
	struct dvb_demux *demux = (struct dvb_demux *) dmx;
	struct dvb_demux_feed *feed;

	if (down_interruptible (&demux->mutex))
		return -ERESTARTSYS;

	if (!(feed = dvb_dmx_feed_alloc(demux))) {
		up(&demux->mutex);
		return -EBUSY;
	}

	feed->type = DMX_TYPE_TS;
	feed->cb.ts = callback;
	feed->demux = demux;
	feed->pid = 0xffff;
	feed->peslen = 0xfffa;
	feed->buffer = 0;

	(*ts_feed) = &feed->feed.ts;
	(*ts_feed)->parent = dmx;
	(*ts_feed)->priv = 0;
	(*ts_feed)->is_filtering = 0;
	(*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
	(*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
	(*ts_feed)->set = dmx_ts_feed_set;


	if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
		feed->state = DMX_STATE_FREE;
		up(&demux->mutex);
		return -EBUSY;
	}

	feed->filter->type = DMX_TYPE_TS;
	feed->filter->feed = feed;
	feed->filter->state = DMX_STATE_READY;
	
	up(&demux->mutex);

	return 0;
}

static int dvbdmx_release_ts_feed(struct dmx_demux *dmx, struct dmx_ts_feed *ts_feed)
{
	struct dvb_demux *demux = (struct dvb_demux *) dmx;
	struct dvb_demux_feed *feed = (struct dvb_demux_feed *) ts_feed;

	if (down_interruptible (&demux->mutex))
		return -ERESTARTSYS;

	if (feed->state == DMX_STATE_FREE) {
		up(&demux->mutex);
		return -EINVAL;
	}

#ifndef NOBUFS
	if (feed->buffer) { 
		vfree(feed->buffer);
		feed->buffer=0;
	}
#endif

	feed->state = DMX_STATE_FREE;
	feed->filter->state = DMX_STATE_FREE;

	dvb_demux_feed_del(feed);

	feed->pid = 0xffff;

	if (feed->ts_type & TS_DECODER)
		demux->pesfilter[feed->pes_type] = NULL;

	up(&demux->mutex);
	return 0;
}


/******************************************************************************
 * dmx_section_feed API calls
 ******************************************************************************/

static int dmx_section_feed_allocate_filter(struct dmx_section_feed* feed, 
				     struct dmx_section_filter** filter) 
{
	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *) feed;
	struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
	struct dvb_demux_filter *dvbdmxfilter;

	if (down_interruptible (&dvbdemux->mutex))
		return -ERESTARTSYS;

	dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
	if (!dvbdmxfilter) {
		up(&dvbdemux->mutex);
		return -EBUSY;
	}

	spin_lock_irq(&dvbdemux->lock);
	*filter = &dvbdmxfilter->filter;
	(*filter)->parent = feed;
	(*filter)->priv = 0;
	dvbdmxfilter->feed = dvbdmxfeed;
	dvbdmxfilter->type = DMX_TYPE_SEC;
	dvbdmxfilter->state = DMX_STATE_READY;
	dvbdmxfilter->next = dvbdmxfeed->filter;
	dvbdmxfeed->filter = dvbdmxfilter;
	spin_unlock_irq(&dvbdemux->lock);

	up(&dvbdemux->mutex);
	return 0;
}


static int dmx_section_feed_set(struct dmx_section_feed* feed, 
			 u16 pid, size_t circular_buffer_size, 
			 int descramble, int check_crc) 
{
	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *) feed;
	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;

	if (pid > 0x1fff)
		return -EINVAL;

	if (down_interruptible (&dvbdmx->mutex))
		return -ERESTARTSYS;
	
	dvb_demux_feed_add(dvbdmxfeed);

	dvbdmxfeed->pid = pid;
	dvbdmxfeed->buffer_size = circular_buffer_size;
	dvbdmxfeed->descramble = descramble;
	if (dvbdmxfeed->descramble) {
		up(&dvbdmx->mutex);
		return -ENOSYS;
	}

	dvbdmxfeed->feed.sec.check_crc = check_crc;

#ifdef NOBUFS
	dvbdmxfeed->buffer = 0;
#else
	dvbdmxfeed->buffer=vmalloc(dvbdmxfeed->buffer_size);
	if (!dvbdmxfeed->buffer) {
		up(&dvbdmx->mutex);
		return -ENOMEM;
	}
#endif

	dvbdmxfeed->state = DMX_STATE_READY;
	up(&dvbdmx->mutex);
	return 0;
}


static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
{
	int i;
	struct dvb_demux_filter *f;
	struct dmx_section_filter *sf;
	u8 mask, mode, doneq;

	if (!(f=dvbdmxfeed->filter))
		return;
	do {
		sf = &f->filter;
		doneq = 0;
		for (i=0; i<DVB_DEMUX_MASK_MAX; i++) {
			mode = sf->filter_mode[i];
			mask = sf->filter_mask[i];
			f->maskandmode[i] = mask & mode;
			doneq |= f->maskandnotmode[i] = mask & ~mode;
		}
		f->doneq = doneq ? 1 : 0;
	} while ((f = f->next));
}


static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
{
	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *) feed;
	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
	int ret;

	if (down_interruptible (&dvbdmx->mutex))
		return -ERESTARTSYS;
	
	if (feed->is_filtering) {
		up(&dvbdmx->mutex);
		return -EBUSY;
	}

	if (!dvbdmxfeed->filter) {
		up(&dvbdmx->mutex);
		return -EINVAL;
	}

	dvbdmxfeed->feed.sec.tsfeedp = 0;
	dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
	dvbdmxfeed->feed.sec.secbufp = 0;
	dvbdmxfeed->feed.sec.seclen = 0;
	
	if (!dvbdmx->start_feed) {
		up(&dvbdmx->mutex);
		return -ENODEV;
	}

	prepare_secfilters(dvbdmxfeed);

	if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
		up(&dvbdmx->mutex);
		return ret;
	}

	spin_lock_irq(&dvbdmx->lock);
	feed->is_filtering = 1;
	dvbdmxfeed->state = DMX_STATE_GO;
	spin_unlock_irq(&dvbdmx->lock);

	up(&dvbdmx->mutex);
	return 0;
}


static int dmx_section_feed_stop_filtering(struct dmx_section_feed* feed)
{
	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *) feed;
	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
	int ret;

	if (down_interruptible (&dvbdmx->mutex))
		return -ERESTARTSYS;

	if (!dvbdmx->stop_feed) {
		up(&dvbdmx->mutex);
		return -ENODEV;
	}

	ret = dvbdmx->stop_feed(dvbdmxfeed); 

	spin_lock_irq(&dvbdmx->lock);
	dvbdmxfeed->state = DMX_STATE_READY;
	feed->is_filtering = 0;
	spin_unlock_irq(&dvbdmx->lock);

	up(&dvbdmx->mutex);
	return ret;
}


static int dmx_section_feed_release_filter(struct dmx_section_feed *feed, 
				struct dmx_section_filter* filter)
{
	struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *) filter, *f;
	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *) feed;
	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;

	if (down_interruptible (&dvbdmx->mutex))
		return -ERESTARTSYS;

	if (dvbdmxfilter->feed != dvbdmxfeed) {
		up(&dvbdmx->mutex);
		return -EINVAL;
	}

	if (feed->is_filtering) 
		feed->stop_filtering(feed);
	
	spin_lock_irq(&dvbdmx->lock);
	f = dvbdmxfeed->filter;

	if (f == dvbdmxfilter) {
		dvbdmxfeed->filter = dvbdmxfilter->next;
	} else {
		while(f->next != dvbdmxfilter)
			f = f->next;
		f->next = f->next->next;
	}

	dvbdmxfilter->state = DMX_STATE_FREE;
	spin_unlock_irq(&dvbdmx->lock);
	up(&dvbdmx->mutex);
	return 0;
}

static int dvbdmx_allocate_section_feed(struct dmx_demux *demux, 
					struct dmx_section_feed **feed,
					dmx_section_cb callback)
{
	struct dvb_demux *dvbdmx = (struct dvb_demux *) demux;
	struct dvb_demux_feed *dvbdmxfeed;

	if (down_interruptible (&dvbdmx->mutex))
		return -ERESTARTSYS;

	if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
		up(&dvbdmx->mutex);
		return -EBUSY;
	}

	dvbdmxfeed->type = DMX_TYPE_SEC;
	dvbdmxfeed->cb.sec = callback;
	dvbdmxfeed->demux = dvbdmx;
	dvbdmxfeed->pid = 0xffff;
	dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
	dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
	dvbdmxfeed->feed.sec.tsfeedp = 0;
	dvbdmxfeed->filter = 0;
	dvbdmxfeed->buffer = 0;

	(*feed)=&dvbdmxfeed->feed.sec;
	(*feed)->is_filtering = 0;
	(*feed)->parent = demux;
	(*feed)->priv = 0;

	(*feed)->set = dmx_section_feed_set;
	(*feed)->allocate_filter = dmx_section_feed_allocate_filter;
	(*feed)->start_filtering = dmx_section_feed_start_filtering;
	(*feed)->stop_filtering = dmx_section_feed_stop_filtering;
	(*feed)->release_filter = dmx_section_feed_release_filter;

	up(&dvbdmx->mutex);
	return 0;
}

static int dvbdmx_release_section_feed(struct dmx_demux *demux, 
				       struct dmx_section_feed *feed)
{
	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *) feed;
	struct dvb_demux *dvbdmx = (struct dvb_demux *) demux;

	if (down_interruptible (&dvbdmx->mutex))
		return -ERESTARTSYS;

	if (dvbdmxfeed->state==DMX_STATE_FREE) {
		up(&dvbdmx->mutex);
		return -EINVAL;
	}
#ifndef NOBUFS
	if (dvbdmxfeed->buffer) {
		vfree(dvbdmxfeed->buffer);
		dvbdmxfeed->buffer=0;
	}
#endif
	dvbdmxfeed->state=DMX_STATE_FREE;

	dvb_demux_feed_del(dvbdmxfeed);

	dvbdmxfeed->pid = 0xffff;

	up(&dvbdmx->mutex);
	return 0;
}


/******************************************************************************
 * dvb_demux kernel data API calls
 ******************************************************************************/

static int dvbdmx_open(struct dmx_demux *demux)
{
	struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;

	if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
		return -EUSERS;

	dvbdemux->users++;
	return 0;
}


static int dvbdmx_close(struct dmx_demux *demux)
{
	struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;

	if (dvbdemux->users == 0)
		return -ENODEV;

	dvbdemux->users--;
	//FIXME: release any unneeded resources if users==0
	return 0;
}


static int dvbdmx_write(struct dmx_demux *demux, const char *buf, size_t count)
{
	struct dvb_demux *dvbdemux=(struct dvb_demux *) demux;

	if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
		return -EINVAL;

	if (down_interruptible (&dvbdemux->mutex))
		return -ERESTARTSYS;
	dvb_dmx_swfilter(dvbdemux, buf, count);
	up(&dvbdemux->mutex);

	if (signal_pending(current))
		return -EINTR;
	return count;
}


static int dvbdmx_add_frontend(struct dmx_demux *demux, struct dmx_frontend *frontend)
{
	struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;
	struct list_head *head = &dvbdemux->frontend_list;
	
	list_add(&(frontend->connectivity_list), head);

	return 0;
}


static int dvbdmx_remove_frontend(struct dmx_demux *demux, struct dmx_frontend *frontend)
{
	struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;
	struct list_head *pos, *n, *head = &dvbdemux->frontend_list;

	list_for_each_safe (pos, n, head) {
		if (DMX_FE_ENTRY(pos) == frontend) {
			list_del(pos);
			return 0;
		}
	}

	return -ENODEV;
}


static struct list_head * dvbdmx_get_frontends(struct dmx_demux *demux)
{
	struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;

	if (list_empty(&dvbdemux->frontend_list))
		return NULL;

	return &dvbdemux->frontend_list;
}


int dvbdmx_connect_frontend(struct dmx_demux *demux, struct dmx_frontend *frontend)
{
	struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;

	if (demux->frontend)
		return -EINVAL;
	
	if (down_interruptible (&dvbdemux->mutex))
		return -ERESTARTSYS;

	demux->frontend = frontend;
	up(&dvbdemux->mutex);
	return 0;
}


int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
{
	struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;

	if (down_interruptible (&dvbdemux->mutex))
		return -ERESTARTSYS;

	demux->frontend = NULL;

	up(&dvbdemux->mutex);
	return 0;
}


static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 *pids)
{
	struct dvb_demux *dvbdemux = (struct dvb_demux *) demux;

	memcpy(pids, dvbdemux->pids, 5*sizeof(u16));
	return 0;
}


int dvb_dmx_init(struct dvb_demux *dvbdemux)
{
	int i, err;
	struct dmx_demux *dmx = &dvbdemux->dmx;

	dvbdemux->users = 0;
	dvbdemux->filter = vmalloc(dvbdemux->filternum*sizeof(struct dvb_demux_filter));

	if (!dvbdemux->filter)
		return -ENOMEM;

	dvbdemux->feed = vmalloc(dvbdemux->feednum*sizeof(struct dvb_demux_feed));
	if (!dvbdemux->feed) {
		vfree(dvbdemux->filter);
		return -ENOMEM;
	}

	for (i=0; i<dvbdemux->filternum; i++) {
		dvbdemux->filter[i].state = DMX_STATE_FREE;
		dvbdemux->filter[i].index = i;
	}

	for (i=0; i<dvbdemux->feednum; i++)
		dvbdemux->feed[i].state = DMX_STATE_FREE;

	dvbdemux->frontend_list.next=
	  dvbdemux->frontend_list.prev=
	    &dvbdemux->frontend_list;

	for (i=0; i<DMX_TS_PES_OTHER; i++) {
		dvbdemux->pesfilter[i] = NULL;
		dvbdemux->pids[i] = 0xffff;
	}

	INIT_LIST_HEAD(&dvbdemux->feed_list);

	dvbdemux->playing = 0;
	dvbdemux->recording = 0;
	dvbdemux->tsbufp = 0;

	if (!dvbdemux->check_crc32)
		dvbdemux->check_crc32 = dvb_dmx_crc32;

	 if (!dvbdemux->memcopy)
		 dvbdemux->memcopy = dvb_dmx_memcopy;

	dmx->frontend = 0;
	dmx->reg_list.prev = dmx->reg_list.next = &dmx->reg_list;
	dmx->priv = (void *) dvbdemux;
	dmx->open = dvbdmx_open;
	dmx->close = dvbdmx_close;
	dmx->write = dvbdmx_write;
	dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
	dmx->release_ts_feed = dvbdmx_release_ts_feed;
	dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
	dmx->release_section_feed = dvbdmx_release_section_feed;

	dmx->descramble_mac_address = NULL;
	dmx->descramble_section_payload = NULL;
	
	dmx->add_frontend = dvbdmx_add_frontend;
	dmx->remove_frontend = dvbdmx_remove_frontend;
	dmx->get_frontends = dvbdmx_get_frontends;
	dmx->connect_frontend = dvbdmx_connect_frontend;
	dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
	dmx->get_pes_pids = dvbdmx_get_pes_pids;

	sema_init(&dvbdemux->mutex, 1);
	spin_lock_init(&dvbdemux->lock);

	if ((err = dmx_register_demux(dmx)) < 0) 
		return err;

	return 0;
}


int dvb_dmx_release(struct dvb_demux *dvbdemux)
{
	struct dmx_demux *dmx = &dvbdemux->dmx;

	dmx_unregister_demux(dmx);
	if (dvbdemux->filter)
		vfree(dvbdemux->filter);
	if (dvbdemux->feed)
		vfree(dvbdemux->feed);
	return 0;
}