--- /dev/null
+/*
+ * 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/sched.h>
+#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 <asm/div64.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 int dvb_demux_tscheck;
+module_param(dvb_demux_tscheck, int, 0644);
+MODULE_PARM_DESC(dvb_demux_tscheck,
+ "enable transport stream continuity and TEI check");
+
+static int dvb_demux_speedcheck;
+module_param(dvb_demux_speedcheck, int, 0644);
+MODULE_PARM_DESC(dvb_demux_speedcheck,
+ "enable transport stream speed check");
+
+static int dvb_demux_feed_err_pkts = 1;
+module_param(dvb_demux_feed_err_pkts, int, 0644);
+MODULE_PARM_DESC(dvb_demux_feed_err_pkts,
+ "when set to 0, drop packets with the TEI bit set (1 by default)");
+
+#define dprintk_tscheck(x...) do { \
+ if (dvb_demux_tscheck && printk_ratelimit()) \
+ printk(x); \
+ } while (0)
+
+/******************************************************************************
+ * 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 = ((feed->cc + 1) & 0x0f) == cc;
+ feed->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_SECTION_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; /* redundant 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);
+ }
+
+ 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 */
+ dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], 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, 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_DEMUX)) == TS_PACKET))
+
+static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
+{
+ struct dvb_demux_feed *feed;
+ u16 pid = ts_pid(buf);
+ int dvr_done = 0;
+
+ if (dvb_demux_speedcheck) {
+ struct timespec cur_time, delta_time;
+ u64 speed_bytes, speed_timedelta;
+
+ demux->speed_pkts_cnt++;
+
+ /* show speed every SPEED_PKTS_INTERVAL packets */
+ if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {
+ cur_time = current_kernel_time();
+
+ if (demux->speed_last_time.tv_sec != 0 &&
+ demux->speed_last_time.tv_nsec != 0) {
+ delta_time = timespec_sub(cur_time,
+ demux->speed_last_time);
+ speed_bytes = (u64)demux->speed_pkts_cnt
+ * 188 * 8;
+ /* convert to 1024 basis */
+ speed_bytes = 1000 * div64_u64(speed_bytes,
+ 1024);
+ speed_timedelta =
+ (u64)timespec_to_ns(&delta_time);
+ speed_timedelta = div64_u64(speed_timedelta,
+ 1000000); /* nsec -> usec */
+ printk(KERN_INFO "TS speed %llu Kbits/sec \n",
+ div64_u64(speed_bytes,
+ speed_timedelta));
+ }
+
+ demux->speed_last_time = cur_time;
+ demux->speed_pkts_cnt = 0;
+ }
+ }
+
+ if (buf[1] & 0x80) {
+ dprintk_tscheck("TEI detected. "
+ "PID=0x%x data1=0x%x\n",
+ pid, buf[1]);
+ /* data in this packet can't be trusted - drop it unless
+ * module option dvb_demux_feed_err_pkts is set */
+ if (!dvb_demux_feed_err_pkts)
+ return;
+ } else /* if TEI bit is set, pid may be wrong- skip pkt counter */
+ if (demux->cnt_storage && dvb_demux_tscheck) {
+ /* check pkt counter */
+ if (pid < MAX_PID) {
+ if (buf[3] & 0x10)
+ demux->cnt_storage[pid] =
+ (demux->cnt_storage[pid] + 1) & 0xf;
+
+ if ((buf[3] & 0xf) != demux->cnt_storage[pid]) {
+ dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n",
+ pid, demux->cnt_storage[pid],
+ buf[3] & 0xf);
+ demux->cnt_storage[pid] = buf[3] & 0xf;
+ }
+ }
+ /* end check */
+ }
+
+ list_for_each_entry(feed, &demux->feed_list, 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);
+ else 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)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&demux->lock, flags);
+
+ while (count--) {
+ if (buf[0] == 0x47)
+ dvb_dmx_swfilter_packet(demux, buf);
+ buf += 188;
+ }
+
+ spin_unlock_irqrestore(&demux->lock, flags);
+}
+
+EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
+
+static inline int find_next_packet(const u8 *buf, int pos, size_t count,
+ const int pktsize)
+{
+ int start = pos, lost;
+
+ while (pos < count) {
+ if (buf[pos] == 0x47 ||
+ (pktsize == 204 && buf[pos] == 0xB8))
+ break;
+ pos++;
+ }
+
+ lost = pos - start;
+ if (lost) {
+ /* This garbage is part of a valid packet? */
+ int backtrack = pos - pktsize;
+ if (backtrack >= 0 && (buf[backtrack] == 0x47 ||
+ (pktsize == 204 && buf[backtrack] == 0xB8)))
+ return backtrack;
+ }
+
+ return pos;
+}
+
+/* Filter all pktsize= 188 or 204 sized packets and skip garbage. */
+static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,
+ size_t count, const int pktsize)
+{
+ int p = 0, i, j;
+ const u8 *q;
+ unsigned long flags;
+
+ spin_lock_irqsave(&demux->lock, flags);
+
+ if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */
+ i = demux->tsbufp;
+ j = pktsize - i;
+ if (count < j) {
+ memcpy(&demux->tsbuf[i], buf, count);
+ demux->tsbufp += count;
+ goto bailout;
+ }
+ memcpy(&demux->tsbuf[i], buf, j);
+ if (demux->tsbuf[0] == 0x47) /* double check */
+ dvb_dmx_swfilter_packet(demux, demux->tsbuf);
+ demux->tsbufp = 0;
+ p += j;
+ }
+
+ while (1) {
+ p = find_next_packet(buf, p, count, pktsize);
+ if (p >= count)
+ break;
+ if (count - p < pktsize)
+ break;
+
+ q = &buf[p];
+
+ if (pktsize == 204 && (*q == 0xB8)) {
+ memcpy(demux->tsbuf, q, 188);
+ demux->tsbuf[0] = 0x47;
+ q = demux->tsbuf;
+ }
+ dvb_dmx_swfilter_packet(demux, q);
+ p += pktsize;
+ }
+
+ i = count - p;
+ if (i) {
+ memcpy(demux->tsbuf, &buf[p], i);
+ demux->tsbufp = i;
+ if (pktsize == 204 && demux->tsbuf[0] == 0xB8)
+ demux->tsbuf[0] = 0x47;
+ }
+
+bailout:
+ spin_unlock_irqrestore(&demux->lock, flags);
+}
+
+void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
+{
+ _dvb_dmx_swfilter(demux, buf, count, 188);
+}
+EXPORT_SYMBOL(dvb_dmx_swfilter);
+
+void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
+{
+ _dvb_dmx_swfilter(demux, buf, count, 204);
+}
+EXPORT_SYMBOL(dvb_dmx_swfilter_204);
+
+void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&demux->lock, flags);
+
+ demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts, DMX_OK);
+
+ spin_unlock_irqrestore(&demux->lock, flags);
+}
+EXPORT_SYMBOL(dvb_dmx_swfilter_raw);
+
+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",
+ __func__, 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",
+ __func__, 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 circular_buffer_size, 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 (mutex_lock_interruptible(&demux->mutex))
+ return -ERESTARTSYS;
+
+ if (ts_type & TS_DECODER) {
+ if (pes_type >= DMX_PES_OTHER) {
+ mutex_unlock(&demux->mutex);
+ return -EINVAL;
+ }
+
+ if (demux->pesfilter[pes_type] &&
+ demux->pesfilter[pes_type] != feed) {
+ mutex_unlock(&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->timeout = timeout;
+ feed->ts_type = ts_type;
+ feed->pes_type = pes_type;
+
+ if (feed->buffer_size) {
+#ifdef NOBUFS
+ feed->buffer = NULL;
+#else
+ feed->buffer = vmalloc(feed->buffer_size);
+ if (!feed->buffer) {
+ mutex_unlock(&demux->mutex);
+ return -ENOMEM;
+ }
+#endif
+ }
+
+ feed->state = DMX_STATE_READY;
+ mutex_unlock(&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 (mutex_lock_interruptible(&demux->mutex))
+ return -ERESTARTSYS;
+
+ if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
+ mutex_unlock(&demux->mutex);
+ return -EINVAL;
+ }
+
+ if (!demux->start_feed) {
+ mutex_unlock(&demux->mutex);
+ return -ENODEV;
+ }
+
+ if ((ret = demux->start_feed(feed)) < 0) {
+ mutex_unlock(&demux->mutex);
+ return ret;
+ }
+
+ spin_lock_irq(&demux->lock);
+ ts_feed->is_filtering = 1;
+ feed->state = DMX_STATE_GO;
+ spin_unlock_irq(&demux->lock);
+ mutex_unlock(&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;
+
+ mutex_lock(&demux->mutex);
+
+ if (feed->state < DMX_STATE_GO) {
+ mutex_unlock(&demux->mutex);
+ return -EINVAL;
+ }
+
+ if (!demux->stop_feed) {
+ mutex_unlock(&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);
+ mutex_unlock(&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 (mutex_lock_interruptible(&demux->mutex))
+ return -ERESTARTSYS;
+
+ if (!(feed = dvb_dmx_feed_alloc(demux))) {
+ mutex_unlock(&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;
+ mutex_unlock(&demux->mutex);
+ return -EBUSY;
+ }
+
+ feed->filter->type = DMX_TYPE_TS;
+ feed->filter->feed = feed;
+ feed->filter->state = DMX_STATE_READY;
+
+ mutex_unlock(&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;
+
+ mutex_lock(&demux->mutex);
+
+ if (feed->state == DMX_STATE_FREE) {
+ mutex_unlock(&demux->mutex);
+ return -EINVAL;
+ }
+#ifndef NOBUFS
+ vfree(feed->buffer);
+ feed->buffer = NULL;
+#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_PES_OTHER)
+ demux->pesfilter[feed->pes_type] = NULL;
+
+ mutex_unlock(&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 (mutex_lock_interruptible(&dvbdemux->mutex))
+ return -ERESTARTSYS;
+
+ dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
+ if (!dvbdmxfilter) {
+ mutex_unlock(&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);
+
+ mutex_unlock(&dvbdemux->mutex);
+ return 0;
+}
+
+static int dmx_section_feed_set(struct dmx_section_feed *feed,
+ u16 pid, size_t circular_buffer_size,
+ 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 (mutex_lock_interruptible(&dvbdmx->mutex))
+ return -ERESTARTSYS;
+
+ dvb_demux_feed_add(dvbdmxfeed);
+
+ dvbdmxfeed->pid = pid;
+ dvbdmxfeed->buffer_size = circular_buffer_size;
+ dvbdmxfeed->feed.sec.check_crc = check_crc;
+
+#ifdef NOBUFS
+ dvbdmxfeed->buffer = NULL;
+#else
+ dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size);
+ if (!dvbdmxfeed->buffer) {
+ mutex_unlock(&dvbdmx->mutex);
+ return -ENOMEM;
+ }
+#endif
+
+ dvbdmxfeed->state = DMX_STATE_READY;
+ mutex_unlock(&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 (mutex_lock_interruptible(&dvbdmx->mutex))
+ return -ERESTARTSYS;
+
+ if (feed->is_filtering) {
+ mutex_unlock(&dvbdmx->mutex);
+ return -EBUSY;
+ }
+
+ if (!dvbdmxfeed->filter) {
+ mutex_unlock(&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) {
+ mutex_unlock(&dvbdmx->mutex);
+ return -ENODEV;
+ }
+
+ prepare_secfilters(dvbdmxfeed);
+
+ if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
+ mutex_unlock(&dvbdmx->mutex);
+ return ret;
+ }
+
+ spin_lock_irq(&dvbdmx->lock);
+ feed->is_filtering = 1;
+ dvbdmxfeed->state = DMX_STATE_GO;
+ spin_unlock_irq(&dvbdmx->lock);
+
+ mutex_unlock(&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;
+
+ mutex_lock(&dvbdmx->mutex);
+
+ if (!dvbdmx->stop_feed) {
+ mutex_unlock(&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);
+
+ mutex_unlock(&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;
+
+ mutex_lock(&dvbdmx->mutex);
+
+ if (dvbdmxfilter->feed != dvbdmxfeed) {
+ mutex_unlock(&dvbdmx->mutex);
+ return -EINVAL;
+ }
+
+ if (feed->is_filtering) {
+ /* release dvbdmx->mutex as far as it is
+ acquired by stop_filtering() itself */
+ mutex_unlock(&dvbdmx->mutex);
+ feed->stop_filtering(feed);
+ mutex_lock(&dvbdmx->mutex);
+ }
+
+ 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);
+ mutex_unlock(&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 (mutex_lock_interruptible(&dvbdmx->mutex))
+ return -ERESTARTSYS;
+
+ if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
+ mutex_unlock(&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;
+
+ mutex_unlock(&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;
+
+ mutex_lock(&dvbdmx->mutex);
+
+ if (dvbdmxfeed->state == DMX_STATE_FREE) {
+ mutex_unlock(&dvbdmx->mutex);
+ return -EINVAL;
+ }
+#ifndef NOBUFS
+ vfree(dvbdmxfeed->buffer);
+ dvbdmxfeed->buffer = NULL;
+#endif
+ dvbdmxfeed->state = DMX_STATE_FREE;
+
+ dvb_demux_feed_del(dvbdmxfeed);
+
+ dvbdmxfeed->pid = 0xffff;
+
+ mutex_unlock(&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 __user *buf, size_t count)
+{
+ struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
+ void *p;
+
+ if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
+ return -EINVAL;
+
+ p = memdup_user(buf, count);
+ if (IS_ERR(p))
+ return PTR_ERR(p);
+ if (mutex_lock_interruptible(&dvbdemux->mutex)) {
+ kfree(p);
+ return -ERESTARTSYS;
+ }
+ dvb_dmx_swfilter(dvbdemux, p, count);
+ kfree(p);
+ mutex_unlock(&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;
+
+ mutex_lock(&dvbdemux->mutex);
+
+ demux->frontend = frontend;
+ mutex_unlock(&dvbdemux->mutex);
+ return 0;
+}
+
+static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
+{
+ struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
+
+ mutex_lock(&dvbdemux->mutex);
+
+ demux->frontend = NULL;
+ mutex_unlock(&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;
+ struct dmx_demux *dmx = &dvbdemux->dmx;
+
+ dvbdemux->cnt_storage = NULL;
+ 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);
+ dvbdemux->filter = NULL;
+ 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->cnt_storage = vmalloc(MAX_PID + 1);
+ if (!dvbdemux->cnt_storage)
+ printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n");
+
+ INIT_LIST_HEAD(&dvbdemux->frontend_list);
+
+ for (i = 0; i < DMX_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->priv = 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->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;
+
+ mutex_init(&dvbdemux->mutex);
+ spin_lock_init(&dvbdemux->lock);
+
+ return 0;
+}
+
+EXPORT_SYMBOL(dvb_dmx_init);
+
+void dvb_dmx_release(struct dvb_demux *dvbdemux)
+{
+ vfree(dvbdemux->cnt_storage);
+ vfree(dvbdemux->filter);
+ vfree(dvbdemux->feed);
+}
+
+EXPORT_SYMBOL(dvb_dmx_release);
Code Review / kvmfornfv.git / blobdiff