725 lines
20 KiB
C
725 lines
20 KiB
C
/* $NetBSD: dtv_demux.c,v 1.4 2011/07/16 12:20:01 jmcneill Exp $ */
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/*-
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* Copyright (c) 2011 Jared D. McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Jared D. McNeill.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This file contains support for the /dev/dvb/adapter<n>/demux0 device.
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*
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* The demux device is implemented as a cloning device. Each instance can
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* be in one of three modes: unconfigured (NONE), section filter (SECTION),
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* or PID filter (PES).
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*
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* An instance in section filter mode extracts PSI sections based on a
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* filter configured by the DMX_SET_FILTER ioctl. When an entire section is
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* received, it is made available to userspace via read method. Data is fed
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* into the section filter using the dtv_demux_write function.
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*
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* An instance in PID filter mode extracts TS packets that match the
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* specified PID filter configured by the DMX_SET_PES_FILTER, DMX_ADD_PID,
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* and DMX_REMOVE_PID ioctls. As this driver only implements the
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* DMX_OUT_TS_TAP output, these TS packets are made available to userspace
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* by calling read on the /dev/dvb/adapter<n>/dvr0 device.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: dtv_demux.c,v 1.4 2011/07/16 12:20:01 jmcneill Exp $");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/conf.h>
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#include <sys/kmem.h>
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#include <sys/device.h>
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#include <sys/select.h>
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#include <sys/filedesc.h>
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#include <sys/file.h>
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#include <sys/poll.h>
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#include <sys/vnode.h>
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#include <sys/queue.h>
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#include <dev/dtv/dtvvar.h>
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static int dtv_demux_read(struct file *, off_t *, struct uio *,
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kauth_cred_t, int);
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static int dtv_demux_ioctl(struct file *, u_long, void *);
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static int dtv_demux_poll(struct file *, int);
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static int dtv_demux_close(struct file *);
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static const struct fileops dtv_demux_fileops = {
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.fo_read = dtv_demux_read,
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.fo_write = fbadop_write,
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.fo_ioctl = dtv_demux_ioctl,
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.fo_fcntl = fnullop_fcntl,
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.fo_poll = dtv_demux_poll,
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.fo_stat = fbadop_stat,
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.fo_close = dtv_demux_close,
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.fo_kqfilter = fnullop_kqfilter,
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.fo_restart = fnullop_restart,
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};
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static uint32_t crc_table[256] = {
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0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
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0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
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0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
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0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
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0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
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0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
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0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
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0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
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0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
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0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
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0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
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0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
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0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
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0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
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0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
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0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
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0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
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0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
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0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
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0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
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0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
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0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
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0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
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0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
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0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
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0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
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0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
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0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
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0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
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0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
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0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
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0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
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0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
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0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
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0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
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0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
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0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
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0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
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0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
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0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
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0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
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0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
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0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
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0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
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0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
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0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
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0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
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0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
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0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
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0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
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0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
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0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
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0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
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0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
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0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
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0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
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0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
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0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
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0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
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0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
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0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
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0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
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0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
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0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
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};
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/* ISO/IEC 13818-1 Annex A "CRC Decoder Model" */
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static uint32_t
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dtv_demux_crc32(uint8_t *buf, int len)
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{
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const uint32_t *crc_tab = crc_table;
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uint32_t CRC = 0xffffffff;
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int i;
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for (i = 0; i < len; i++)
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CRC = (CRC << 8) ^ crc_tab[((CRC >> 24) ^ *buf++) & 0xff];
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return CRC;
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}
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/*
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* Start running the demux.
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*/
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static int
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dtv_demux_start(struct dtv_demux *demux)
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{
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struct dtv_softc *sc = demux->dd_sc;
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int error = 0;
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bool dostart = false;
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/*
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* If the demux is not running, mark it as running and update the
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* global demux run counter.
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*/
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mutex_enter(&sc->sc_lock);
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KASSERT(sc->sc_demux_runcnt >= 0);
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if (demux->dd_running == false) {
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sc->sc_demux_runcnt++;
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demux->dd_running = true;
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/* If this is the first demux running, trigger device start */
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dostart = sc->sc_demux_runcnt == 1;
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}
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mutex_exit(&sc->sc_lock);
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if (dostart) {
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/* Setup receive buffers and trigger device start */
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error = dtv_buffer_setup(sc);
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if (error == 0)
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error = dtv_device_start_transfer(sc);
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}
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/*
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* If something went wrong, restore the run counter and mark this
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* demux instance as halted.
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*/
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if (error) {
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mutex_enter(&sc->sc_lock);
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sc->sc_demux_runcnt--;
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demux->dd_running = false;
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mutex_exit(&sc->sc_lock);
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}
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return error;
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}
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/*
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* Stop running the demux.
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*/
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static int
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dtv_demux_stop(struct dtv_demux *demux)
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{
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struct dtv_softc *sc = demux->dd_sc;
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int error = 0;
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bool dostop = false;
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/*
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* If the demux is running, mark it as halted and update the
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* global demux run counter.
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*/
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mutex_enter(&sc->sc_lock);
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if (demux->dd_running == true) {
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KASSERT(sc->sc_demux_runcnt > 0);
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demux->dd_running = false;
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sc->sc_demux_runcnt--;
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/* If this was the last demux running, trigger device stop */
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dostop = sc->sc_demux_runcnt == 0;
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}
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mutex_exit(&sc->sc_lock);
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if (dostop) {
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/* Trigger device stop */
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error = dtv_device_stop_transfer(sc);
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}
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/*
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* If something went wrong, restore the run counter and mark this
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* demux instance as running.
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*/
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if (error) {
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mutex_enter(&sc->sc_lock);
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sc->sc_demux_runcnt++;
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demux->dd_running = true;
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mutex_exit(&sc->sc_lock);
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}
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return error;
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}
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/*
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* Put the demux into PID filter mode and update the PID filter table.
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*/
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static int
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dtv_demux_set_pidfilter(struct dtv_demux *demux, uint16_t pid, bool onoff)
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{
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struct dtv_softc *sc = demux->dd_sc;
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/*
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* TS PID is 13 bits; demux device uses special PID 0x2000 to mean
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* "all PIDs". Verify that the requested PID is in range.
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*/
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if (pid > 0x2000)
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return EINVAL;
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/* Set demux mode */
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demux->dd_mode = DTV_DEMUX_MODE_PES;
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/*
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* If requesting "all PIDs", set the on/off flag for all PIDs in
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* the PID map, otherwise set the on/off flag for the requested
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* PID.
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*/
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if (pid == 0x2000) {
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memset(sc->sc_ts.ts_pidfilter, onoff,
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sizeof(sc->sc_ts.ts_pidfilter));
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} else {
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sc->sc_ts.ts_pidfilter[pid] = onoff;
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}
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return 0;
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}
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/*
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* Open a new instance of the demux cloning device.
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*/
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int
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dtv_demux_open(struct dtv_softc *sc, int flags, int mode, lwp_t *l)
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{
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struct file *fp;
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struct dtv_demux *demux;
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int error, fd;
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/* Allocate private storage */
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demux = kmem_zalloc(sizeof(*demux), KM_SLEEP);
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if (demux == NULL)
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return ENOMEM;
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demux->dd_sc = sc;
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/* Default operation mode is unconfigured */
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demux->dd_mode = DTV_DEMUX_MODE_NONE;
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selinit(&demux->dd_sel);
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mutex_init(&demux->dd_lock, MUTEX_DEFAULT, IPL_VM);
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cv_init(&demux->dd_section_cv, "dtvsec");
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error = fd_allocfile(&fp, &fd);
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if (error) {
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kmem_free(demux, sizeof(*demux));
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return error;
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}
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/* Add the demux to the list of demux instances */
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mutex_enter(&sc->sc_demux_lock);
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TAILQ_INSERT_TAIL(&sc->sc_demux_list, demux, dd_entries);
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mutex_exit(&sc->sc_demux_lock);
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return fd_clone(fp, fd, flags, &dtv_demux_fileops, demux);
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}
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/*
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* Close the instance of the demux cloning device.
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*/
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int
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dtv_demux_close(struct file *fp)
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{
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struct dtv_demux *demux = fp->f_data;
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struct dtv_softc *sc;
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int error;
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if (demux == NULL)
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return ENXIO;
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fp->f_data = NULL;
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sc = demux->dd_sc;
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/* If the demux is still running, stop it */
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if (demux->dd_running) {
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error = dtv_demux_stop(demux);
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if (error)
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return error;
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}
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/* Remove the demux from the list of demux instances */
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mutex_enter(&sc->sc_demux_lock);
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TAILQ_REMOVE(&sc->sc_demux_list, demux, dd_entries);
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mutex_exit(&sc->sc_demux_lock);
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mutex_destroy(&demux->dd_lock);
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cv_destroy(&demux->dd_section_cv);
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kmem_free(demux, sizeof(*demux));
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/* Update the global device open count */
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dtv_common_close(sc);
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return 0;
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}
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/*
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* Handle demux ioctl requests
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*/
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static int
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dtv_demux_ioctl(struct file *fp, u_long cmd, void *data)
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{
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struct dtv_demux *demux = fp->f_data;
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struct dtv_softc *sc;
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struct dmx_pes_filter_params *pesfilt;
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struct dmx_sct_filter_params *sctfilt;
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uint16_t pid;
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int error;
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if (demux == NULL)
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return ENXIO;
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sc = demux->dd_sc;
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switch (cmd) {
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case DMX_START:
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return dtv_demux_start(demux);
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case DMX_STOP:
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return dtv_demux_stop(demux);
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case DMX_SET_BUFFER_SIZE:
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/*
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* The demux driver doesn't support configurable buffer sizes,
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* but software relies on this command succeeding.
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*/
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return 0;
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case DMX_SET_FILTER:
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sctfilt = data;
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/* Verify that the requested PID is in range. */
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if (sctfilt->pid >= 0x2000)
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return EINVAL;
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/*
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* Update section filter parameters, reset read/write ptrs,
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* clear section count and overflow flag, and set the
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* demux instance mode to section filter.
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*/
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demux->dd_secfilt.params = *sctfilt;
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demux->dd_secfilt.rp = demux->dd_secfilt.wp = 0;
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demux->dd_secfilt.nsections = 0;
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demux->dd_secfilt.overflow = false;
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demux->dd_mode = DTV_DEMUX_MODE_SECTION;
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/*
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* If the DMX_IMMEDIATE_START flag is present in the request,
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* start running the demux immediately (no need for a
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* subsequent DMX_START ioctl).
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*/
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if (sctfilt->flags & DMX_IMMEDIATE_START) {
|
|
error = dtv_demux_start(demux);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
case DMX_SET_PES_FILTER:
|
|
pesfilt = data;
|
|
|
|
/* The driver only supports input from the frontend */
|
|
if (pesfilt->input != DMX_IN_FRONTEND)
|
|
return EINVAL;
|
|
/*
|
|
* The driver only supports output to the TS TAP in PID
|
|
* filter mode.
|
|
*/
|
|
if (pesfilt->output != DMX_OUT_TS_TAP)
|
|
return EINVAL;
|
|
|
|
/* Update PID filter table */
|
|
error = dtv_demux_set_pidfilter(demux, pesfilt->pid, true);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* If the DMX_IMMEDIATE_START flag is present in the request,
|
|
* start running the demux immediately (no need for a
|
|
* subsequent DMX_START ioctl).
|
|
*/
|
|
if (pesfilt->flags & DMX_IMMEDIATE_START) {
|
|
error = dtv_demux_start(demux);
|
|
if (error)
|
|
return error;
|
|
}
|
|
return 0;
|
|
case DMX_ADD_PID:
|
|
pid = *(uint16_t *)data;
|
|
return dtv_demux_set_pidfilter(demux, pid, true);
|
|
case DMX_REMOVE_PID:
|
|
pid = *(uint16_t *)data;
|
|
return dtv_demux_set_pidfilter(demux, pid, false);
|
|
default:
|
|
return EINVAL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Test for I/O readiness
|
|
*/
|
|
static int
|
|
dtv_demux_poll(struct file *fp, int events)
|
|
{
|
|
struct dtv_demux *demux = fp->f_data;
|
|
int revents = 0;
|
|
|
|
if (demux == NULL)
|
|
return POLLERR;
|
|
|
|
/*
|
|
* If the demux instance is in section filter mode, wait for an
|
|
* entire section to become ready.
|
|
*/
|
|
mutex_enter(&demux->dd_lock);
|
|
if (demux->dd_mode == DTV_DEMUX_MODE_SECTION &&
|
|
demux->dd_secfilt.nsections > 0) {
|
|
revents |= POLLIN;
|
|
} else {
|
|
selrecord(curlwp, &demux->dd_sel);
|
|
}
|
|
mutex_exit(&demux->dd_lock);
|
|
|
|
return revents;
|
|
}
|
|
|
|
/*
|
|
* Read from the demux instance
|
|
*/
|
|
static int
|
|
dtv_demux_read(struct file *fp, off_t *offp, struct uio *uio,
|
|
kauth_cred_t cred, int flags)
|
|
{
|
|
struct dtv_demux *demux = fp->f_data;
|
|
struct dtv_ts_section sec;
|
|
int error;
|
|
|
|
if (demux == NULL)
|
|
return ENXIO;
|
|
|
|
/* Only support read if the instance is in section filter mode */
|
|
if (demux->dd_mode != DTV_DEMUX_MODE_SECTION)
|
|
return EIO;
|
|
|
|
/* Wait for a complete PSI section */
|
|
mutex_enter(&demux->dd_lock);
|
|
while (demux->dd_secfilt.nsections == 0) {
|
|
if (flags & IO_NDELAY) {
|
|
mutex_exit(&demux->dd_lock);
|
|
/* No data available */
|
|
return EWOULDBLOCK;
|
|
}
|
|
error = cv_wait_sig(&demux->dd_section_cv, &demux->dd_lock);
|
|
if (error) {
|
|
mutex_exit(&demux->dd_lock);
|
|
return error;
|
|
}
|
|
}
|
|
/* Copy the completed PSI section */
|
|
sec = demux->dd_secfilt.section[demux->dd_secfilt.rp];
|
|
/* Update read pointer */
|
|
demux->dd_secfilt.rp++;
|
|
if (demux->dd_secfilt.rp >= __arraycount(demux->dd_secfilt.section))
|
|
demux->dd_secfilt.rp = 0;
|
|
/* Update section count */
|
|
demux->dd_secfilt.nsections--;
|
|
mutex_exit(&demux->dd_lock);
|
|
|
|
/*
|
|
* If the filter parameters specify the DMX_ONESHOT flag, stop
|
|
* the demux after one PSI section is received.
|
|
*/
|
|
if (demux->dd_secfilt.params.flags & DMX_ONESHOT)
|
|
dtv_demux_stop(demux);
|
|
|
|
/*
|
|
* Copy the PSI section to userspace. If the receiving buffer is
|
|
* too small, the rest of the payload will be discarded. Although
|
|
* this behaviour differs from the Linux implementation, in practice
|
|
* it should not be an issue as PSI sections have a max size of 4KB
|
|
* (and callers will generally provide a big enough buffer).
|
|
*/
|
|
return uiomove(sec.sec_buf, sec.sec_length, uio);
|
|
}
|
|
|
|
/*
|
|
* Verify the CRC of a PSI section.
|
|
*/
|
|
static bool
|
|
dtv_demux_check_crc(struct dtv_demux *demux, struct dtv_ts_section *sec)
|
|
{
|
|
uint32_t crc, sec_crc;
|
|
|
|
/*
|
|
* If section_syntax_indicator is not set, the PSI section does
|
|
* not include a CRC field.
|
|
*/
|
|
if ((sec->sec_buf[1] & 0x80) == 0)
|
|
return false;
|
|
|
|
sec_crc = be32dec(&sec->sec_buf[sec->sec_length - 4]);
|
|
crc = dtv_demux_crc32(&sec->sec_buf[0], sec->sec_length - 4);
|
|
|
|
return crc == sec_crc;
|
|
}
|
|
|
|
/*
|
|
* Process a single TS packet and extract PSI sections based on the
|
|
* instance's section filter.
|
|
*/
|
|
static int
|
|
dtv_demux_process(struct dtv_demux *demux, const uint8_t *tspkt,
|
|
size_t tspktlen)
|
|
{
|
|
struct dtv_ts_section *sec;
|
|
dmx_filter_t *dmxfilt = &demux->dd_secfilt.params.filter;
|
|
const uint8_t *p;
|
|
uint16_t section_length;
|
|
int brem, avail;
|
|
|
|
KASSERT(tspktlen == TS_PKTLEN);
|
|
|
|
/* If the demux instance is not running, ignore the packet */
|
|
if (demux->dd_running == false)
|
|
return 0;
|
|
|
|
/*
|
|
* If the demux instance is not in section filter mode, ignore
|
|
* the packet
|
|
*/
|
|
if (demux->dd_mode != DTV_DEMUX_MODE_SECTION)
|
|
return 0;
|
|
/*
|
|
* If the packet's TS PID does not match the section filter PID,
|
|
* ignore the packet
|
|
*/
|
|
if (TS_PID(tspkt) != demux->dd_secfilt.params.pid)
|
|
return 0;
|
|
/*
|
|
* If the TS packet does not contain a payload, ignore the packet
|
|
*/
|
|
if (TS_HAS_PAYLOAD(tspkt) == 0)
|
|
return 0;
|
|
|
|
mutex_enter(&demux->dd_lock);
|
|
|
|
/* If the section buffer is full, set the overflow flag and return */
|
|
if (demux->dd_secfilt.nsections ==
|
|
__arraycount(demux->dd_secfilt.section)) {
|
|
demux->dd_secfilt.overflow = true;
|
|
goto done;
|
|
}
|
|
sec = &demux->dd_secfilt.section[demux->dd_secfilt.wp];
|
|
/* If we have no bytes in our buffer, wait for payload unit start */
|
|
if (sec->sec_bytesused == 0 && TS_HAS_PUSI(tspkt) == 0)
|
|
goto done;
|
|
|
|
/* find payload start */
|
|
p = tspkt + 4;
|
|
if (TS_HAS_AF(tspkt)) {
|
|
if (*p > 182) /* AF length with payload is between 0-182 */
|
|
goto done;
|
|
p += (1 + *p);
|
|
}
|
|
if (TS_HAS_PUSI(tspkt)) {
|
|
p += (1 + *p);
|
|
}
|
|
|
|
brem = tspktlen - (p - tspkt);
|
|
|
|
if (TS_HAS_PUSI(tspkt)) {
|
|
if (brem < 16)
|
|
goto done;
|
|
|
|
section_length = ((p[1] & 0xf) << 8) | p[2];
|
|
|
|
/* table_id filter */
|
|
if (dmxfilt->mask[0]) {
|
|
if ((p[0] & dmxfilt->mask[0]) != dmxfilt->filter[0])
|
|
goto done;
|
|
}
|
|
/* table_id_ext filter */
|
|
if (dmxfilt->mask[1] && dmxfilt->mask[2]) {
|
|
/*
|
|
* table_id_ext is only valid if
|
|
* section_syntax_indicator is set
|
|
*/
|
|
if (section_length < 2 || (p[1] & 0x80) == 0)
|
|
goto done;
|
|
if ((p[3] & dmxfilt->mask[1]) != dmxfilt->filter[1])
|
|
goto done;
|
|
if ((p[4] & dmxfilt->mask[2]) != dmxfilt->filter[2])
|
|
goto done;
|
|
}
|
|
|
|
sec->sec_length = section_length + 3;
|
|
|
|
/* maximum section length is 4KB */
|
|
if (sec->sec_length > sizeof(sec->sec_buf)) {
|
|
sec->sec_bytesused = sec->sec_length = 0;
|
|
goto done;
|
|
}
|
|
|
|
}
|
|
|
|
/* If we have bytes pending and we see payload unit start, flush buf */
|
|
if (sec->sec_bytesused > 0 && TS_HAS_PUSI(tspkt))
|
|
sec->sec_bytesused = sec->sec_length = 0;
|
|
|
|
/* Copy data into section buffer */
|
|
avail = min(sec->sec_length - sec->sec_bytesused, brem);
|
|
if (avail < 0)
|
|
goto done;
|
|
memcpy(&sec->sec_buf[sec->sec_bytesused], p, avail);
|
|
sec->sec_bytesused += avail;
|
|
|
|
/*
|
|
* If a complete section has been received, update section count
|
|
* and notify readers.
|
|
*/
|
|
if (sec->sec_bytesused == sec->sec_length) {
|
|
/*
|
|
* If the DMX_CHECK_CRC flag was present in the DMX_SET_FILTER
|
|
* parameters, verify the PSI section checksum. If the
|
|
* checksum is invalid, discard the entire corrupt section.
|
|
*/
|
|
if ((demux->dd_secfilt.params.flags & DMX_CHECK_CRC) &&
|
|
dtv_demux_check_crc(demux, sec) == false) {
|
|
/* discard section */
|
|
sec->sec_bytesused = sec->sec_length = 0;
|
|
goto done;
|
|
}
|
|
|
|
demux->dd_secfilt.wp++;
|
|
if (demux->dd_secfilt.wp >=
|
|
__arraycount(demux->dd_secfilt.section))
|
|
demux->dd_secfilt.wp = 0;
|
|
demux->dd_secfilt.nsections++;
|
|
cv_broadcast(&demux->dd_section_cv);
|
|
selnotify(&demux->dd_sel, 0, 0);
|
|
}
|
|
|
|
done:
|
|
mutex_exit(&demux->dd_lock);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Submit TS data to all demux instances
|
|
*/
|
|
void
|
|
dtv_demux_write(struct dtv_softc *sc, const uint8_t *tspkt, size_t tspktlen)
|
|
{
|
|
struct dtv_demux *demux;
|
|
|
|
mutex_enter(&sc->sc_demux_lock);
|
|
TAILQ_FOREACH(demux, &sc->sc_demux_list, dd_entries) {
|
|
dtv_demux_process(demux, tspkt, tspktlen);
|
|
}
|
|
mutex_exit(&sc->sc_demux_lock);
|
|
}
|