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OpenCloudOS-Kernel/drivers/media/dvb/dvb-core/dvb_demux.c

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/*
* 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"
#define NOBUFS
/*
** #define DVB_DEMUX_SECTION_LOSS_LOG to monitor payload loss in the syslog
*/
// #define DVB_DEMUX_SECTION_LOSS_LOG
static LIST_HEAD(dmx_muxs);
static int dmx_register_demux(struct dmx_demux *demux)
{
demux->users = 0;
list_add(&demux->reg_list, &dmx_muxs);
return 0;
}
static 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;
}
/******************************************************************************
* 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 u8 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;
}
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, NULL, 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,
NULL, 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;
int section_syntax_indicator;
if (!sec->is_filtering)
return 0;
if (!f)
return 0;
if (sec->check_crc) {
section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
if (section_syntax_indicator &&
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->seclen = 0;
return 0;
}
static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
{
struct dmx_section_feed *sec = &feed->feed.sec;
#ifdef DVB_DEMUX_SECTION_LOSS_LOG
if(sec->secbufp < sec->tsfeedp)
{
int i, n = sec->tsfeedp - sec->secbufp;
/* section padding is done with 0xff bytes entirely.
** due to speed reasons, we won't check all of them
** but just first and last
*/
if(sec->secbuf[0] != 0xff || sec->secbuf[n-1] != 0xff)
{
printk("dvb_demux.c section ts padding loss: %d/%d\n",
n, sec->tsfeedp);
printk("dvb_demux.c pad data:");
for(i = 0; i < n; i++)
printk(" %02x", sec->secbuf[i]);
printk("\n");
}
}
#endif
sec->tsfeedp = sec->secbufp = sec->seclen = 0;
sec->secbuf = sec->secbuf_base;
}
/*
** Losless Section Demux 1.4.1 by Emard
** Valsecchi Patrick:
** - middle of section A (no PUSI)
** - end of section A and start of section B
** (with PUSI pointing to the start of the second section)
**
** In this case, without feed->pusi_seen you'll receive a garbage section
** consisting of the end of section A. Basically because tsfeedp
** is incemented and the use=0 condition is not raised
** when the second packet arrives.
**
** Fix:
** when demux is started, let feed->pusi_seen = 0 to
** prevent initial feeding of garbage from the end of
** previous section. When you for the first time see PUSI=1
** then set feed->pusi_seen = 1
*/
static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed, const u8 *buf, u8 len)
{
struct dvb_demux *demux = feed->demux;
struct dmx_section_feed *sec = &feed->feed.sec;
u16 limit, seclen, n;
if(sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
return 0;
if(sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE)
{
#ifdef DVB_DEMUX_SECTION_LOSS_LOG
printk("dvb_demux.c section buffer full loss: %d/%d\n",
sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE, DMX_MAX_SECFEED_SIZE);
#endif
len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
}
if(len <= 0)
return 0;
demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
sec->tsfeedp += len;
/* -----------------------------------------------------
** Dump all the sections we can find in the data (Emard)
*/
limit = sec->tsfeedp;
if(limit > DMX_MAX_SECFEED_SIZE)
return -1; /* internal error should never happen */
/* to be sure always set secbuf */
sec->secbuf = sec->secbuf_base + sec->secbufp;
for(n = 0; sec->secbufp + 2 < limit; n++)
{
seclen = section_length(sec->secbuf);
if(seclen <= 0 || seclen > DMX_MAX_SECFEED_SIZE
|| seclen + sec->secbufp > limit)
return 0;
sec->seclen = seclen;
sec->crc_val = ~0;
/* dump [secbuf .. secbuf+seclen) */
if(feed->pusi_seen)
dvb_dmx_swfilter_section_feed(feed);
#ifdef DVB_DEMUX_SECTION_LOSS_LOG
else
printk("dvb_demux.c pusi not seen, discarding section data\n");
#endif
sec->secbufp += seclen; /* secbufp and secbuf moving together is */
sec->secbuf += seclen; /* redundand but saves pointer arithmetic */
}
return 0;
}
static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed, const u8 *buf)
{
u8 p, count;
int ccok, dc_i = 0;
u8 cc;
count = payload(buf);
if (count == 0) /* count == 0 if no payload or out of range */
return -1;
p = 188 - count; /* payload start */
cc = buf[3] & 0x0f;
ccok = ((feed->cc + 1) & 0x0f) == cc;
feed->cc = cc;
if (buf[3] & 0x20) {
/* adaption field present, check for discontinuity_indicator */
if ((buf[4] > 0) && (buf[5] & 0x80))
dc_i = 1;
}
if (!ccok || dc_i) {
#ifdef DVB_DEMUX_SECTION_LOSS_LOG
printk("dvb_demux.c discontinuity detected %d bytes lost\n", count);
/* those bytes under sume circumstances will again be reported
** in the following dvb_dmx_swfilter_section_new
*/
#endif
/* Discontinuity detected. Reset pusi_seen = 0 to
** stop feeding of suspicious data until next PUSI=1 arrives
*/
feed->pusi_seen = 0;
dvb_dmx_swfilter_section_new(feed);
return 0;
}
if (buf[1] & 0x40) {
// PUSI=1 (is set), section boundary is here
if (count > 1 && buf[p] < count) {
const u8 *before = buf+p+1;
u8 before_len = buf[p];
const u8 *after = before+before_len;
u8 after_len = count-1-before_len;
dvb_dmx_swfilter_section_copy_dump(feed, before, before_len);
/* before start of new section, set pusi_seen = 1 */
feed->pusi_seen = 1;
dvb_dmx_swfilter_section_new(feed);
dvb_dmx_swfilter_section_copy_dump(feed, after, after_len);
}
#ifdef DVB_DEMUX_SECTION_LOSS_LOG
else
if (count > 0)
printk("dvb_demux.c PUSI=1 but %d bytes lost\n", count);
#endif
} else {
// PUSI=0 (is not set), no section boundary
const u8 *entire = buf+p;
u8 entire_len = count;
dvb_dmx_swfilter_section_copy_dump(feed, entire, entire_len);
}
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, NULL, 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;
}
}
#define DVR_FEED(f) \
(((f)->type == DMX_TYPE_TS) && \
((f)->feed.ts.is_filtering) && \
(((f)->ts_type & (TS_PACKET|TS_PAYLOAD_ONLY)) == TS_PACKET))
static 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);
int dvr_done = 0;
list_for_each(pos, head) {
feed = list_entry(pos, struct dvb_demux_feed, list_head);
if ((feed->pid != pid) && (feed->pid != 0x2000))
continue;
/* copy each packet only once to the dvr device, even
* if a PID is in multiple filters (e.g. video + PCR) */
if ((DVR_FEED(feed)) && (dvr_done++))
continue;
if (feed->pid == pid) {
dvb_dmx_swfilter_packet_type(feed, buf);
if (DVR_FEED(feed))
continue;
}
if (feed->pid == 0x2000)
feed->cb.ts(buf, 188, NULL, 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);
}
EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
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);
}
EXPORT_SYMBOL(dvb_dmx_swfilter);
void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
{
int p = 0,i, j;
u8 tmppack[188];
spin_lock(&demux->lock);
if ((i = demux->tsbufp)) {
if (count < (j=204-i)) {
memcpy(&demux->tsbuf[i], buf, count);
demux->tsbufp += count;
goto bailout;
}
memcpy(&demux->tsbuf[i], buf, j);
if ((demux->tsbuf[0] == 0x47)|(demux->tsbuf[0]==0xB8)) {
memcpy(tmppack, demux->tsbuf, 188);
if (tmppack[0] == 0xB8) tmppack[0] = 0x47;
dvb_dmx_swfilter_packet(demux, tmppack);
}
demux->tsbufp = 0;
p += j;
}
while (p < count) {
if ((buf[p] == 0x47)|(buf[p] == 0xB8)) {
if (count-p >= 204) {
memcpy(tmppack, buf+p, 188);
if (tmppack[0] == 0xB8) tmppack[0] = 0x47;
dvb_dmx_swfilter_packet(demux, tmppack);
p += 204;
} else {
i = count-p;
memcpy(demux->tsbuf, buf+p, i);
demux->tsbufp=i;
goto bailout;
}
} else {
p++;
}
}
bailout:
spin_unlock(&demux->lock);
}
EXPORT_SYMBOL(dvb_dmx_swfilter_204);
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 dvb_demux_feed_find(struct dvb_demux_feed *feed)
{
struct dvb_demux_feed *entry;
list_for_each_entry(entry, &feed->demux->feed_list, list_head)
if (entry == feed)
return 1;
return 0;
}
static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
{
spin_lock_irq(&feed->demux->lock);
if (dvb_demux_feed_find(feed)) {
printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n",
__FUNCTION__, feed->type, feed->state, feed->pid);
goto out;
}
list_add(&feed->list_head, &feed->demux->feed_list);
out:
spin_unlock_irq(&feed->demux->lock);
}
static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
{
spin_lock_irq(&feed->demux->lock);
if (!(dvb_demux_feed_find(feed))) {
printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n",
__FUNCTION__, feed->type, feed->state, feed->pid);
goto out;
}
list_del(&feed->list_head);
out:
spin_unlock_irq(&feed->demux->lock);
}
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;
if (pid > DMX_MAX_PID)
return -EINVAL;
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;
}
demux->pesfilter[pes_type] = feed;
demux->pids[pes_type] = pid;
}
dvb_demux_feed_add(feed);
feed->pid = pid;
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=NULL;
#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 = NULL;
(*ts_feed) = &feed->feed.ts;
(*ts_feed)->parent = dmx;
(*ts_feed)->priv = NULL;
(*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
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 && feed->pes_type < DMX_TS_PES_OTHER)
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 = NULL;
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 = NULL;
#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 = NULL;
dvbdmxfeed->buffer = NULL;
(*feed)=&dvbdmxfeed->feed.sec;
(*feed)->is_filtering = 0;
(*feed)->parent = demux;
(*feed)->priv = NULL;
(*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
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;
}
static 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;
}
static 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->feed[i].index = i;
}
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 = NULL;
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;
}
EXPORT_SYMBOL(dvb_dmx_init);
int dvb_dmx_release(struct dvb_demux *dvbdemux)
{
struct dmx_demux *dmx = &dvbdemux->dmx;
dmx_unregister_demux(dmx);
vfree(dvbdemux->filter);
vfree(dvbdemux->feed);
return 0;
}
EXPORT_SYMBOL(dvb_dmx_release);
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