/*
* dvb_demux.c - DVB kernel demux API
*
* Copyright (C) 2000-2001 Ralph Metzler <ralph@convergence.de>
* & Marcus Metzler <marcus@convergence.de>
* for convergence integrated media GmbH
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/string.h>
#include <linux/crc32.h>
#include <asm/uaccess.h>
#include "dvb_demux.h"
#include "dvb_functions.h"
#define NOBUFS
LIST_HEAD(dmx_muxs);
int dmx_register_demux(struct dmx_demux *demux)
{
demux->users = 0;
list_add(&demux->reg_list, &dmx_muxs);
return 0;
}
int dmx_unregister_demux(struct dmx_demux* demux)
{
struct list_head *pos, *n, *head=&dmx_muxs;
list_for_each_safe (pos, n, head) {
if (DMX_DIR_ENTRY(pos) == demux) {
if (demux->users>0)
return -EINVAL;
list_del(pos);
return 0;
}
}
return -ENODEV;
}
struct list_head *dmx_get_demuxes(void)
{
if (list_empty(&dmx_muxs))
return NULL;
return &dmx_muxs;
}
/******************************************************************************
* static inlined helper functions
******************************************************************************/
static inline u16 section_length(const u8 *buf)
{
return 3+((buf[1]&0x0f)<<8)+buf[2];
}
static inline u16 ts_pid(const u8 *buf)
{
return ((buf[1]&0x1f)<<8)+buf[2];
}
static inline int payload(const u8 *tsp)
{
if (!(tsp[3]&0x10)) // no payload?
return 0;
if (tsp[3]&0x20) { // adaptation field?
if (tsp[4]>183) // corrupted data?
return 0;
else
return 184-1-tsp[4];
}
return 184;
}
void dvb_set_crc32(u8 *data, int length)
{
u32 crc;
crc = crc32_be(~0, data, length);
data[length] = (crc >> 24) & 0xff;
data[length+1] = (crc >> 16) & 0xff;
data[length+2] = (crc >> 8) & 0xff;
data[length+3] = (crc) & 0xff;
}
static u32 dvb_dmx_crc32 (struct dvb_demux_feed *f, const u8 *src, size_t len)
{
return (f->feed.sec.crc_val = crc32_be (f->feed.sec.crc_val, src, len));
}
static void dvb_dmx_memcopy (struct dvb_demux_feed *f, u8 *d, const u8 *s, size_t len)
{
memcpy (d, s, len);
}
/******************************************************************************
* Software filter functions
******************************************************************************/
static inline int dvb_dmx_swfilter_payload (struct dvb_demux_feed *feed, const u8 *buf)
{
int count = payload(buf);
int p;
//int ccok;
//u8 cc;
if (count == 0)
return -1;
p = 188-count;
/*
cc=buf[3]&0x0f;
ccok=((dvbdmxfeed->cc+1)&0x0f)==cc ? 1 : 0;
dvbdmxfeed->cc=cc;
if (!ccok)
printk("missed packet!\n");
*/
if (buf[1] & 0x40) // PUSI ?
feed->peslen = 0xfffa;
feed->peslen += count;
return feed->cb.ts (&buf[p], count, 0, 0, &feed->feed.ts, DMX_OK);
}
static int dvb_dmx_swfilter_sectionfilter (struct dvb_demux_feed *feed,
struct dvb_demux_filter *f)
{
u8 neq = 0;
int i;
for (i=0; i<DVB_DEMUX_MASK_MAX; i++) {
u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
if (f->maskandmode[i] & xor)
return 0;
neq |= f->maskandnotmode[i] & xor;
}
if (f->doneq & !neq)
return 0;
return feed->cb.sec (feed->feed.sec.secbuf, feed->feed.sec.seclen,
0, 0, &f->filter, DMX_OK);
}
static inline int dvb_dmx_swfilter_section_feed (struct dvb_demux_feed *feed)
{
struct dvb_demux *demux = feed->demux;
struct dvb_demux_filter *f = feed->filter;
struct dmx_section_feed *sec = &feed->feed.sec;
u8 *buf = sec->secbuf;
if (sec->secbufp != sec->seclen)
return -1;
if (!sec->is_filtering)
return 0;
if (!f)
return 0;
if (sec->check_crc && demux->check_crc32(feed, sec->secbuf, sec->seclen))
return -1;
do {
if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
return -1;
} while ((f = f->next) && sec->is_filtering);
sec->secbufp = sec->seclen = 0;
memset(buf, 0, DVB_DEMUX_MASK_MAX);
return 0;
}
static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed, const u8 *buf)
{
struct dvb_demux *demux = feed->demux;
struct dmx_section_feed *sec = &feed->feed.sec;
int p, count;
int ccok, rest;
u8 cc;
if (!(count = payload(buf)))
return -1;
p = 188-count;
cc = buf[3] & 0x0f;
ccok = ((feed->cc+1) & 0x0f) == cc ? 1 : 0;
feed->cc = cc;
if (buf[1] & 0x40) { // PUSI set
// offset to start of first section is in buf[p]
if (p+buf[p]>187) // trash if it points beyond packet
return -1;
if (buf[p] && ccok) { // rest of previous section?
// did we have enough data in last packet to calc length?
int tmp = 3 - sec->secbufp;
if (tmp > 0 && tmp != 3) {
if (p + tmp >= 187)
return -1;
demux->memcopy (feed, sec->secbuf+sec->secbufp,
buf+p+1, tmp);
sec->seclen = section_length(sec->secbuf);
if (sec->seclen > 4096)
return -1;
}
rest = sec->seclen - sec->secbufp;
if (rest == buf[p] && sec->seclen) {
demux->memcopy (feed, sec->secbuf + sec->secbufp,
buf+p+1, buf[p]);
sec->secbufp += buf[p];
dvb_dmx_swfilter_section_feed(feed);
}
}
p += buf[p] + 1; // skip rest of last section
count = 188 - p;
while (count) {
sec->crc_val = ~0;
if ((count>2) && // enough data to determine sec length?
((sec->seclen = section_length(buf+p)) <= count)) {
if (sec->seclen>4096)
return -1;
demux->memcopy (feed, sec->secbuf, buf+p,
sec->seclen);
sec->secbufp = sec->seclen;
p += sec->seclen;
count = 188 - p;
dvb_dmx_swfilter_section_feed(feed);
// filling bytes until packet end?
if (count && buf[p]==0xff)
count=0;
} else { // section continues to following TS packet
demux->memcopy(feed, sec->secbuf, buf+p, count);
sec->secbufp+=count;
count=0;
}
}
return 0;
}
// section continued below
if (!ccok)
return -1;
if (!sec->secbufp) // any data in last ts packet?
return -1;
// did we have enough data in last packet to calc section length?
if (sec->secbufp < 3) {
int tmp = 3 - sec->secbufp;
if (tmp>count)
return -1;
sec->crc_val = ~0;
demux->memcopy (feed, sec->secbuf + sec->secbufp, buf+p, tmp);
sec->seclen = section_length(sec->secbuf);
if (sec->seclen > 4096)
return -1;
}
rest = sec->seclen - sec->secbufp;
if (rest < 0)
return -1;
if (rest <= count) { // section completed in this TS packet
demux->memcopy (feed, sec->secbuf + sec->secbufp, buf+p, rest);
sec->secbufp += rest;
dvb_dmx_swfilter_section_feed(feed);
} else { // section continues in following ts packet
demux->memcopy (feed, sec->secbuf + sec->secbufp, buf+p, count);
sec->secbufp += count;
}
return 0;
}
static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed, const u8 *buf)
{
switch(feed->type) {
case DMX_TYPE_TS:
if (!feed->feed.ts.is_filtering)
break;
if (feed->ts_type & TS_PACKET) {
if (feed->ts_type & TS_PAYLOAD_ONLY)
dvb_dmx_swfilter_payload(feed, buf);
else
feed->cb.ts(buf, 188, 0, 0, &feed->feed.ts, DMX_OK);
}
if (feed->ts_type & TS_DECODER)
if (feed->demux->write_to_decoder)
feed->demux->write_to_decoder(feed, buf, 188);
break;
case DMX_TYPE_SEC:
if (!feed->feed.sec.is_filtering)
break;
if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
feed->feed.sec.seclen = feed->feed.sec.secbufp=0;
break;
default:
break;
}
}
void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
{
struct dvb_demux_feed *feed;
struct list_head *pos, *head=&demux->feed_list;
u16 pid = ts_pid(buf);
list_for_each(pos, head) {
feed = list_entry(pos, struct dvb_demux_feed, list_head);
if (feed->pid == pid)
dvb_dmx_swfilter_packet_type (feed, buf);
if (feed->pid == 0x2000)
feed->cb.ts(buf, 188, 0, 0, &feed->feed.ts, DMX_OK);
}
}
void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf, size_t count)
{
spin_lock(&demux->lock);
while (count--) {
if(buf[0] == 0x47) {
dvb_dmx_swfilter_packet(demux, buf);
}
buf += 188;
}
spin_unlock(&demux->lock);
}
void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
{
int p = 0,i, j;
spin_lock(&demux->lock);
if ((i = demux->tsbufp)) {
if (count < (j=188-i)) {
memcpy(&demux->tsbuf[i], buf, count);
demux->tsbufp += count;
goto bailout;
}
memcpy(&demux->tsbuf[i], buf, j);
if (demux->tsbuf[0] == 0x47)
dvb_dmx_swfilter_packet(demux, demux->tsbuf);
demux->tsbufp = 0;
p += j;
}
while (p < count) {
if (buf[p] == 0x47) {
if (count-p >= 188) {
dvb_dmx_swfilter_packet(demux, buf+p);
p += 188;
} else {
i = count-p;
memcpy(demux->tsbuf, buf+p, i);
demux->tsbufp=i;
goto bailout;
}
} else
p++;
}
bailout:
spin_unlock(&demux->lock);
}
static struct dvb_demux_filter * dvb_dmx_filter_alloc(struct dvb_demux *demux)
{
int i;
for (i=0; i<demux->filternum; i++)
if (demux->filter[i].state == DMX_STATE_FREE)
break;
if (i == demux->filternum)
return NULL;
demux->filter[i].state = DMX_STATE_ALLOCATED;
return &demux->filter[i];
}
static struct dvb_demux_feed * dvb_dmx_feed_alloc(struct dvb_demux *demux)
{
int i;
for (i=0; i<demux->feednum; i++)
if (demux->feed[i].state == DMX_STATE_FREE)
break;
if (i == demux->feednum)
return NULL;
demux->feed[i].state = DMX_STATE_ALLOCATED;
return &demux->feed[i];
}
static int dmx_pid_set (u16 pid, struct dvb_demux_feed *feed)
{
struct dvb_demux *demux = feed->demux;
struct list_head *pos, *n, *head=&demux->feed_list;
if (pid > DMX_MAX_PID)
return -EINVAL;
if (pid == feed->pid)
return 0;
if (feed->pid <= DMX_MAX_PID) {
list_for_each_safe(pos, n, head) {
if (DMX_FEED_ENTRY(pos)->pid == feed->pid) {
list_del(pos);
break;
}
}
}
list_add(&feed->list_head, head);
feed->pid = pid;
return 0;
}
static int dmx_ts_feed_set (struct dmx_ts_feed* ts_feed, u16 pid, int ts_type,
enum dmx_ts_pes pes_type, size_t callback_length,
size_t circular_buffer_size, int descramble,
struct timespec timeout)
{
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 (ts_type & TS_DECODER) {
if (pes_type >= DMX_TS_PES_OTHER) {
up(&demux->mutex);
return -EINVAL;
}
if (demux->pesfilter[pes_type] &&
demux->pesfilter[pes_type] != feed) {
up(&demux->mutex);
return -EINVAL;
}
if ((pes_type != DMX_TS_PES_PCR0) &&
(pes_type != DMX_TS_PES_PCR1) &&
(pes_type != DMX_TS_PES_PCR2) &&
(pes_type != DMX_TS_PES_PCR3)) {
if ((ret = dmx_pid_set(pid, feed))<0) {
up(&demux->mutex);
return ret;
}
} else
feed->pid = pid;
demux->pesfilter[pes_type] = feed;
demux->pids[pes_type] = feed->pid;
} else {
if ((ret = dmx_pid_set(pid, feed))<0) {
up(&demux->mutex);
return ret;
}
}
feed->buffer_size = circular_buffer_size;
feed->descramble = descramble;
feed->timeout = timeout;
feed->cb_length = callback_length;
feed->ts_type = ts_type;
feed->pes_type = pes_type;
if (feed->descramble) {
up(&demux->mutex);
return -ENOSYS;
}
if (feed->buffer_size) {
#ifdef NOBUFS
feed->buffer=0;
#else
feed->buffer = vmalloc(feed->buffer_size);
if (!feed->buffer) {
up(&demux->mutex);
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;
struct list_head *pos, *n, *head=&demux->feed_list;
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;
if (feed->pid <= DMX_MAX_PID) {
list_for_each_safe(pos, n, head)
if (DMX_FEED_ENTRY(pos)->pid == feed->pid) {
list_del(pos);
break;
}
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;
struct list_head *pos, *n, *head=&dvbdmx->feed_list;
if (pid>0x1fff)
return -EINVAL;
if (down_interruptible (&dvbdmx->mutex))
return -ERESTARTSYS;
if (dvbdmxfeed->pid <= DMX_MAX_PID) {
list_for_each_safe(pos, n, head) {
if (DMX_FEED_ENTRY(pos)->pid == dvbdmxfeed->pid) {
list_del(pos);
break;
}
}
}
list_add(&dvbdmxfeed->list_head, head);
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.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.secbufp=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;
struct list_head *pos, *n, *head=&dvbdmx->feed_list;
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;
if (dvbdmxfeed->pid <= DMX_MAX_PID) {
list_for_each_safe(pos, n, head) {
if (DMX_FEED_ENTRY(pos)->pid == dvbdmxfeed->pid) {
list_del(pos);
break;
}
}
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;
}
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