| /* |
| * 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. |
| * |
| */ |
| |
| #define pr_fmt(fmt) "dvb_demux: " fmt |
| |
| #include <linux/sched/signal.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 <linux/uaccess.h> |
| #include <asm/div64.h> |
| |
| #include <media/dvb_demux.h> |
| |
| 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(fmt, arg...) \ |
| printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg) |
| |
| #define dprintk_tscheck(x...) do { \ |
| if (dvb_demux_tscheck && printk_ratelimit()) \ |
| dprintk(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; |
| #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG |
| int ccok; |
| u8 cc; |
| #endif |
| |
| if (count == 0) |
| return -1; |
| |
| p = 188 - count; |
| |
| #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG |
| cc = buf[3] & 0x0f; |
| ccok = ((feed->cc + 1) & 0x0f) == cc; |
| feed->cc = cc; |
| if (!ccok) |
| dprintk("missed packet!\n"); |
| #endif |
| |
| if (buf[1] & 0x40) // PUSI ? |
| feed->peslen = 0xfffa; |
| |
| feed->peslen += count; |
| |
| return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts); |
| } |
| |
| 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); |
| } |
| |
| 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 CONFIG_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) { |
| dprintk("dvb_demux.c section ts padding loss: %d/%d\n", |
| n, sec->tsfeedp); |
| dprintk("dvb_demux.c pad data:"); |
| for (i = 0; i < n; i++) |
| pr_cont(" %02x", sec->secbuf[i]); |
| pr_cont("\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 = false 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 = true |
| */ |
| 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 CONFIG_DVB_DEMUX_SECTION_LOSS_LOG |
| dprintk("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 CONFIG_DVB_DEMUX_SECTION_LOSS_LOG |
| else |
| dprintk("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 CONFIG_DVB_DEMUX_SECTION_LOSS_LOG |
| dprintk("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 to |
| * stop feeding of suspicious data until next PUSI=1 arrives |
| */ |
| feed->pusi_seen = false; |
| 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 */ |
| feed->pusi_seen = true; |
| dvb_dmx_swfilter_section_new(feed); |
| dvb_dmx_swfilter_section_copy_dump(feed, after, |
| after_len); |
| } |
| #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG |
| else if (count > 0) |
| dprintk("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); |
| } |
| /* Used only on full-featured devices */ |
| 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) { |
| ktime_t cur_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 = ktime_get(); |
| |
| if (ktime_to_ns(demux->speed_last_time) != 0) { |
| speed_bytes = (u64)demux->speed_pkts_cnt |
| * 188 * 8; |
| /* convert to 1024 basis */ |
| speed_bytes = 1000 * div64_u64(speed_bytes, |
| 1024); |
| speed_timedelta = ktime_ms_delta(cur_time, |
| demux->speed_last_time); |
| dprintk("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); |
| } |
| } |
| |
| 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); |
| |
| 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)) { |
| pr_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))) { |
| pr_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, ktime_t 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->timeout = timeout; |
| feed->ts_type = ts_type; |
| feed->pes_type = pes_type; |
| |
| 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; |
| |
| (*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; |
| } |
| |
| 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, 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->feed.sec.check_crc = check_crc; |
| |
| 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 = false; |
| 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 ? true : false; |
| } 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; |
| |
| (*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; |
| } |
| 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) |
| pr_warn("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); |