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1328 lines
32 KiB
1328 lines
32 KiB
/* |
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* dvb_demux.c - DVB kernel demux API |
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* |
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* Copyright (C) 2000-2001 Ralph Metzler <[email protected]> |
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* & Marcus Metzler <[email protected]> |
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* for convergence integrated media GmbH |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public License |
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* as published by the Free Software Foundation; either version 2.1 |
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* of the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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*/ |
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#define pr_fmt(fmt) "dvb_demux: " fmt |
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#include <linux/sched/signal.h> |
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#include <linux/spinlock.h> |
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#include <linux/slab.h> |
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#include <linux/vmalloc.h> |
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#include <linux/module.h> |
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#include <linux/poll.h> |
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#include <linux/string.h> |
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#include <linux/crc32.h> |
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#include <linux/uaccess.h> |
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#include <asm/div64.h> |
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#include <media/dvb_demux.h> |
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static int dvb_demux_tscheck; |
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module_param(dvb_demux_tscheck, int, 0644); |
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MODULE_PARM_DESC(dvb_demux_tscheck, |
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"enable transport stream continuity and TEI check"); |
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|
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static int dvb_demux_speedcheck; |
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module_param(dvb_demux_speedcheck, int, 0644); |
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MODULE_PARM_DESC(dvb_demux_speedcheck, |
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"enable transport stream speed check"); |
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static int dvb_demux_feed_err_pkts = 1; |
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module_param(dvb_demux_feed_err_pkts, int, 0644); |
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MODULE_PARM_DESC(dvb_demux_feed_err_pkts, |
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"when set to 0, drop packets with the TEI bit set (1 by default)"); |
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#define dprintk(fmt, arg...) \ |
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printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg) |
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#define dprintk_tscheck(x...) do { \ |
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if (dvb_demux_tscheck && printk_ratelimit()) \ |
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dprintk(x); \ |
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} while (0) |
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#ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG |
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# define dprintk_sect_loss(x...) dprintk(x) |
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#else |
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# define dprintk_sect_loss(x...) |
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#endif |
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#define set_buf_flags(__feed, __flag) \ |
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do { \ |
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(__feed)->buffer_flags |= (__flag); \ |
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} while (0) |
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/****************************************************************************** |
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* static inlined helper functions |
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******************************************************************************/ |
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static inline u16 section_length(const u8 *buf) |
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{ |
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return 3 + ((buf[1] & 0x0f) << 8) + buf[2]; |
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} |
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|
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static inline u16 ts_pid(const u8 *buf) |
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{ |
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return ((buf[1] & 0x1f) << 8) + buf[2]; |
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} |
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static inline u8 payload(const u8 *tsp) |
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{ |
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if (!(tsp[3] & 0x10)) // no payload? |
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return 0; |
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if (tsp[3] & 0x20) { // adaptation field? |
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if (tsp[4] > 183) // corrupted data? |
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return 0; |
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else |
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return 184 - 1 - tsp[4]; |
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} |
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return 184; |
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} |
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static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len) |
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{ |
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return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len)); |
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} |
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static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s, |
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size_t len) |
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{ |
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memcpy(d, s, len); |
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} |
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/****************************************************************************** |
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* Software filter functions |
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******************************************************************************/ |
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static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed, |
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const u8 *buf) |
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{ |
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int count = payload(buf); |
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int p; |
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int ccok; |
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u8 cc; |
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if (count == 0) |
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return -1; |
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p = 188 - count; |
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cc = buf[3] & 0x0f; |
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ccok = ((feed->cc + 1) & 0x0f) == cc; |
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feed->cc = cc; |
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if (!ccok) { |
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set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED); |
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dprintk_sect_loss("missed packet: %d instead of %d!\n", |
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cc, (feed->cc + 1) & 0x0f); |
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} |
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if (buf[1] & 0x40) // PUSI ? |
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feed->peslen = 0xfffa; |
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feed->peslen += count; |
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return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts, |
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&feed->buffer_flags); |
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} |
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static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed, |
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struct dvb_demux_filter *f) |
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{ |
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u8 neq = 0; |
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int i; |
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for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) { |
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u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i]; |
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if (f->maskandmode[i] & xor) |
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return 0; |
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neq |= f->maskandnotmode[i] & xor; |
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} |
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if (f->doneq && !neq) |
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return 0; |
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return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen, |
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NULL, 0, &f->filter, &feed->buffer_flags); |
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} |
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static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed) |
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{ |
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struct dvb_demux *demux = feed->demux; |
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struct dvb_demux_filter *f = feed->filter; |
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struct dmx_section_feed *sec = &feed->feed.sec; |
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int section_syntax_indicator; |
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if (!sec->is_filtering) |
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return 0; |
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if (!f) |
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return 0; |
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if (sec->check_crc) { |
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section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0); |
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if (section_syntax_indicator && |
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demux->check_crc32(feed, sec->secbuf, sec->seclen)) { |
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set_buf_flags(feed, DMX_BUFFER_FLAG_HAD_CRC32_DISCARD); |
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return -1; |
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} |
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} |
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do { |
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if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0) |
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return -1; |
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} while ((f = f->next) && sec->is_filtering); |
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sec->seclen = 0; |
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return 0; |
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} |
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static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed) |
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{ |
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struct dmx_section_feed *sec = &feed->feed.sec; |
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if (sec->secbufp < sec->tsfeedp) { |
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int n = sec->tsfeedp - sec->secbufp; |
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/* |
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* Section padding is done with 0xff bytes entirely. |
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* Due to speed reasons, we won't check all of them |
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* but just first and last. |
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*/ |
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if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) { |
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set_buf_flags(feed, |
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DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED); |
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dprintk_sect_loss("section ts padding loss: %d/%d\n", |
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n, sec->tsfeedp); |
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dprintk_sect_loss("pad data: %*ph\n", n, sec->secbuf); |
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} |
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} |
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sec->tsfeedp = sec->secbufp = sec->seclen = 0; |
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sec->secbuf = sec->secbuf_base; |
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} |
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/* |
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* Losless Section Demux 1.4.1 by Emard |
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* Valsecchi Patrick: |
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* - middle of section A (no PUSI) |
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* - end of section A and start of section B |
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* (with PUSI pointing to the start of the second section) |
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* |
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* In this case, without feed->pusi_seen you'll receive a garbage section |
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* consisting of the end of section A. Basically because tsfeedp |
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* is incemented and the use=0 condition is not raised |
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* when the second packet arrives. |
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* |
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* Fix: |
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* when demux is started, let feed->pusi_seen = false to |
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* prevent initial feeding of garbage from the end of |
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* previous section. When you for the first time see PUSI=1 |
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* then set feed->pusi_seen = true |
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*/ |
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static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed, |
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const u8 *buf, u8 len) |
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{ |
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struct dvb_demux *demux = feed->demux; |
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struct dmx_section_feed *sec = &feed->feed.sec; |
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u16 limit, seclen, n; |
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if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE) |
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return 0; |
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if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) { |
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set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED); |
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dprintk_sect_loss("section buffer full loss: %d/%d\n", |
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sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE, |
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DMX_MAX_SECFEED_SIZE); |
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len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp; |
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} |
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if (len <= 0) |
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return 0; |
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demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len); |
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sec->tsfeedp += len; |
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/* |
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* Dump all the sections we can find in the data (Emard) |
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*/ |
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limit = sec->tsfeedp; |
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if (limit > DMX_MAX_SECFEED_SIZE) |
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return -1; /* internal error should never happen */ |
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/* to be sure always set secbuf */ |
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sec->secbuf = sec->secbuf_base + sec->secbufp; |
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for (n = 0; sec->secbufp + 2 < limit; n++) { |
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seclen = section_length(sec->secbuf); |
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if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE |
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|| seclen + sec->secbufp > limit) |
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return 0; |
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sec->seclen = seclen; |
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sec->crc_val = ~0; |
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/* dump [secbuf .. secbuf+seclen) */ |
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if (feed->pusi_seen) { |
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dvb_dmx_swfilter_section_feed(feed); |
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} else { |
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set_buf_flags(feed, |
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DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED); |
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dprintk_sect_loss("pusi not seen, discarding section data\n"); |
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} |
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sec->secbufp += seclen; /* secbufp and secbuf moving together is */ |
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sec->secbuf += seclen; /* redundant but saves pointer arithmetic */ |
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} |
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return 0; |
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} |
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static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed, |
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const u8 *buf) |
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{ |
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u8 p, count; |
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int ccok, dc_i = 0; |
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u8 cc; |
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count = payload(buf); |
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if (count == 0) /* count == 0 if no payload or out of range */ |
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return -1; |
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p = 188 - count; /* payload start */ |
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cc = buf[3] & 0x0f; |
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ccok = ((feed->cc + 1) & 0x0f) == cc; |
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feed->cc = cc; |
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if (buf[3] & 0x20) { |
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/* adaption field present, check for discontinuity_indicator */ |
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if ((buf[4] > 0) && (buf[5] & 0x80)) |
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dc_i = 1; |
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} |
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if (!ccok || dc_i) { |
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if (dc_i) { |
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set_buf_flags(feed, |
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DMX_BUFFER_FLAG_DISCONTINUITY_INDICATOR); |
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dprintk_sect_loss("%d frame with disconnect indicator\n", |
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cc); |
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} else { |
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set_buf_flags(feed, |
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DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED); |
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dprintk_sect_loss("discontinuity: %d instead of %d. %d bytes lost\n", |
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cc, (feed->cc + 1) & 0x0f, count + 4); |
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} |
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/* |
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* those bytes under some circumstances will again be reported |
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* in the following dvb_dmx_swfilter_section_new |
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*/ |
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/* |
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* Discontinuity detected. Reset pusi_seen to |
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* stop feeding of suspicious data until next PUSI=1 arrives |
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* |
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* FIXME: does it make sense if the MPEG-TS is the one |
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* reporting discontinuity? |
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*/ |
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feed->pusi_seen = false; |
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dvb_dmx_swfilter_section_new(feed); |
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} |
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if (buf[1] & 0x40) { |
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/* PUSI=1 (is set), section boundary is here */ |
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if (count > 1 && buf[p] < count) { |
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const u8 *before = &buf[p + 1]; |
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u8 before_len = buf[p]; |
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const u8 *after = &before[before_len]; |
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u8 after_len = count - 1 - before_len; |
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dvb_dmx_swfilter_section_copy_dump(feed, before, |
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before_len); |
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/* before start of new section, set pusi_seen */ |
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feed->pusi_seen = true; |
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dvb_dmx_swfilter_section_new(feed); |
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dvb_dmx_swfilter_section_copy_dump(feed, after, |
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after_len); |
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} else if (count > 0) { |
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set_buf_flags(feed, |
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DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED); |
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dprintk_sect_loss("PUSI=1 but %d bytes lost\n", count); |
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} |
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} else { |
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/* PUSI=0 (is not set), no section boundary */ |
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dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count); |
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} |
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return 0; |
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} |
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static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed, |
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const u8 *buf) |
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{ |
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switch (feed->type) { |
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case DMX_TYPE_TS: |
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if (!feed->feed.ts.is_filtering) |
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break; |
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if (feed->ts_type & TS_PACKET) { |
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if (feed->ts_type & TS_PAYLOAD_ONLY) |
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dvb_dmx_swfilter_payload(feed, buf); |
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else |
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feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, |
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&feed->buffer_flags); |
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} |
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/* Used only on full-featured devices */ |
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if (feed->ts_type & TS_DECODER) |
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if (feed->demux->write_to_decoder) |
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feed->demux->write_to_decoder(feed, buf, 188); |
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break; |
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case DMX_TYPE_SEC: |
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if (!feed->feed.sec.is_filtering) |
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break; |
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if (dvb_dmx_swfilter_section_packet(feed, buf) < 0) |
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feed->feed.sec.seclen = feed->feed.sec.secbufp = 0; |
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break; |
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|
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default: |
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break; |
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} |
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} |
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#define DVR_FEED(f) \ |
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(((f)->type == DMX_TYPE_TS) && \ |
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((f)->feed.ts.is_filtering) && \ |
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(((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET)) |
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static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf) |
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{ |
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struct dvb_demux_feed *feed; |
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u16 pid = ts_pid(buf); |
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int dvr_done = 0; |
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if (dvb_demux_speedcheck) { |
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ktime_t cur_time; |
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u64 speed_bytes, speed_timedelta; |
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demux->speed_pkts_cnt++; |
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|
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/* show speed every SPEED_PKTS_INTERVAL packets */ |
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if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) { |
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cur_time = ktime_get(); |
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if (ktime_to_ns(demux->speed_last_time) != 0) { |
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speed_bytes = (u64)demux->speed_pkts_cnt |
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* 188 * 8; |
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/* convert to 1024 basis */ |
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speed_bytes = 1000 * div64_u64(speed_bytes, |
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1024); |
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speed_timedelta = ktime_ms_delta(cur_time, |
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demux->speed_last_time); |
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if (speed_timedelta) |
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dprintk("TS speed %llu Kbits/sec \n", |
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div64_u64(speed_bytes, |
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speed_timedelta)); |
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} |
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|
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demux->speed_last_time = cur_time; |
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demux->speed_pkts_cnt = 0; |
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} |
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} |
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|
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if (buf[1] & 0x80) { |
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list_for_each_entry(feed, &demux->feed_list, list_head) { |
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if ((feed->pid != pid) && (feed->pid != 0x2000)) |
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continue; |
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set_buf_flags(feed, DMX_BUFFER_FLAG_TEI); |
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} |
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dprintk_tscheck("TEI detected. PID=0x%x data1=0x%x\n", |
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pid, buf[1]); |
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/* data in this packet can't be trusted - drop it unless |
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* module option dvb_demux_feed_err_pkts is set */ |
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if (!dvb_demux_feed_err_pkts) |
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return; |
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} else /* if TEI bit is set, pid may be wrong- skip pkt counter */ |
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if (demux->cnt_storage && dvb_demux_tscheck) { |
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/* check pkt counter */ |
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if (pid < MAX_PID) { |
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if (buf[3] & 0x10) |
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demux->cnt_storage[pid] = |
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(demux->cnt_storage[pid] + 1) & 0xf; |
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|
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if ((buf[3] & 0xf) != demux->cnt_storage[pid]) { |
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list_for_each_entry(feed, &demux->feed_list, list_head) { |
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if ((feed->pid != pid) && (feed->pid != 0x2000)) |
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continue; |
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set_buf_flags(feed, |
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DMX_BUFFER_PKT_COUNTER_MISMATCH); |
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} |
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|
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dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n", |
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pid, demux->cnt_storage[pid], |
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buf[3] & 0xf); |
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demux->cnt_storage[pid] = buf[3] & 0xf; |
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} |
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} |
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/* end check */ |
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} |
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|
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list_for_each_entry(feed, &demux->feed_list, list_head) { |
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if ((feed->pid != pid) && (feed->pid != 0x2000)) |
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continue; |
|
|
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/* copy each packet only once to the dvr device, even |
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* if a PID is in multiple filters (e.g. video + PCR) */ |
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if ((DVR_FEED(feed)) && (dvr_done++)) |
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continue; |
|
|
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if (feed->pid == pid) |
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dvb_dmx_swfilter_packet_type(feed, buf); |
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else if (feed->pid == 0x2000) |
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feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, |
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&feed->buffer_flags); |
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} |
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} |
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|
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void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf, |
|
size_t count) |
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{ |
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unsigned long flags; |
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|
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spin_lock_irqsave(&demux->lock, flags); |
|
|
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while (count--) { |
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if (buf[0] == 0x47) |
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dvb_dmx_swfilter_packet(demux, buf); |
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buf += 188; |
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} |
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|
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spin_unlock_irqrestore(&demux->lock, flags); |
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} |
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|
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EXPORT_SYMBOL(dvb_dmx_swfilter_packets); |
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|
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static inline int find_next_packet(const u8 *buf, int pos, size_t count, |
|
const int pktsize) |
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{ |
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int start = pos, lost; |
|
|
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while (pos < count) { |
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if (buf[pos] == 0x47 || |
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(pktsize == 204 && buf[pos] == 0xB8)) |
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break; |
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pos++; |
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} |
|
|
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lost = pos - start; |
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if (lost) { |
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/* This garbage is part of a valid packet? */ |
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int backtrack = pos - pktsize; |
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if (backtrack >= 0 && (buf[backtrack] == 0x47 || |
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(pktsize == 204 && buf[backtrack] == 0xB8))) |
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return backtrack; |
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} |
|
|
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return pos; |
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} |
|
|
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/* Filter all pktsize= 188 or 204 sized packets and skip garbage. */ |
|
static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, |
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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, |
|
&demux->feed->buffer_flags); |
|
|
|
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; |
|
feed->buffer_flags = 0; |
|
|
|
(*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; |
|
dvbdmxfeed->pusi_seen = false; |
|
|
|
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->buffer_flags = 0; |
|
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(array_size(sizeof(struct dvb_demux_filter), |
|
dvbdemux->filternum)); |
|
|
|
if (!dvbdemux->filter) |
|
return -ENOMEM; |
|
|
|
dvbdemux->feed = vmalloc(array_size(sizeof(struct dvb_demux_feed), |
|
dvbdemux->feednum)); |
|
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);
|
|
|