1 /* 2 * Copyright (C) 2005 3 * Petr Holub, Hidetoshi Shimokawa. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * 16 * This product includes software developed by Hidetoshi Shimokawa. 17 * 18 * 4. Neither the name of the author nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $FreeBSD$ 35 */ 36 #include <sys/param.h> 37 #include <sys/ioctl.h> 38 #include <sys/time.h> 39 #include <sys/types.h> 40 #include <sys/uio.h> 41 42 #if __FreeBSD_version >= 500000 43 #include <arpa/inet.h> 44 #endif 45 46 #include <err.h> 47 #include <errno.h> 48 #include <unistd.h> 49 #include <fcntl.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <sysexits.h> 54 55 #include <dev/firewire/firewire.h> 56 #include <dev/firewire/iec68113.h> 57 58 #include "fwmethods.h" 59 60 #define DEBUG 0 61 62 /***************************************************************************** 63 64 MPEG-2 Transport Stream (MPEG TS) packet format according to IEC 61883: 65 66 31 15 0 67 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -------- 68 | len |tag| channel | tcode | sy | 69 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1394 70 | header_CRC | 71 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -------- 72 |0|0| sid | dbs |fn | qpc |S|RSV| dbc | 73 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ CIP 74 |1|0| fmt | fdf | fdf/syt | 75 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -------- 76 | reserved | cycle_count | cycle_offset | 77 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 78 | | N x 79 . . MPEG 80 . MPEG TS payload 188 bytes . 81 . . 82 | | 83 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -------- 84 | data_CRC | 85 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 86 87 N.b. that CRCs are removed by firewire layer! 88 89 The following fiels are fixed for IEEE-1394: 90 tag = 01b 91 tcode = 1010b 92 The length is payload length, i.e. includes CIP header and data size. 93 94 The following fields are constant for MPEG TS: 95 sph = 1 (denoted as S in CIP header above) 96 dbs = 6 97 fmt = (1<<5) 98 fdf = reserved 99 In the supported streams we also require 100 qpc = 0 101 fn = 3 102 and thus the payload is divided in 8 blocks as follows: 103 104 +-----+-----+-----+-----+-----+-----+-----+-----+ 105 | db0 | db1 | db2 | db3 | db4 | db5 | db6 | db7 | 106 +-----+-----+-----+-----+-----+-----+-----+-----+ 107 108 We have several cases of payload distribution based on stream 109 bandwidth (R): 110 1) R < 1.5 Mbps: any of db0..db7 may be payload, 111 2) 1.5 < R < 3 Mbps: db0/db1 or db2/db3 or db4/db5 or db6/db7 is payload, 112 3) 3 < R < 6 Mbps: db0/db1/db2/db3 or db4/db5/db6/db7 is payload, 113 4) R > 6 Mbps: all db0..db7 contain the payload. 114 Curently, only case (4) is supported in fwmpegts.c 115 116 Each packet may contain N MPEG TS data blocks with timestamp header, 117 which are (4+188)B long. Experimentally, the N ranges from 0 through 3. 118 119 *****************************************************************************/ 120 121 122 typedef uint8_t mpeg_ts_pld[188]; 123 124 struct mpeg_pldt { 125 #if BYTE_ORDER == BIG_ENDIAN 126 uint32_t :7, 127 c_count:13, 128 c_offset:12; 129 #else /* BYTE_ORDER != BIG_ENDIAN */ 130 uint32_t c_offset:12, 131 c_count:13, 132 :7; 133 #endif /* BYTE_ORDER == BIG_ENDIAN */ 134 mpeg_ts_pld payload; 135 }; 136 137 138 #define NCHUNK 8 139 #define PSIZE 596 140 #define NPACKET_R 4096 141 #define RBUFSIZE (PSIZE * NPACKET_R) 142 143 void 144 mpegtsrecv(int d, const char *filename, char ich, int count) 145 { 146 struct ciphdr *ciph; 147 struct fw_isochreq isoreq; 148 struct fw_isobufreq bufreq; 149 struct fw_pkt *pkt; 150 struct mpeg_pldt *pld; 151 uint32_t *ptr; 152 int fd, k, len, m, pkt_size, startwr, tlen; 153 char *buf; 154 155 startwr = 0; 156 157 if (strcmp(filename, "-") == 0) 158 fd = STDOUT_FILENO; 159 else { 160 fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0660); 161 if (fd == -1) 162 err(EX_NOINPUT, filename); 163 } 164 buf = malloc(RBUFSIZE); 165 166 bufreq.rx.nchunk = NCHUNK; 167 bufreq.rx.npacket = NPACKET_R; 168 bufreq.rx.psize = PSIZE; 169 bufreq.tx.nchunk = 0; 170 bufreq.tx.npacket = 0; 171 bufreq.tx.psize = 0; 172 if (ioctl(d, FW_SSTBUF, &bufreq) < 0) 173 err(1, "ioctl"); 174 175 isoreq.ch = ich & 0x3f; 176 isoreq.tag = (ich >> 6) & 3; 177 178 if (ioctl(d, FW_SRSTREAM, &isoreq) < 0) 179 err(1, "ioctl"); 180 181 k = m = 0; 182 while (count <= 0 || k <= count) { 183 len = tlen = read(d, buf, RBUFSIZE); 184 #if DEBUG 185 fprintf(stderr, "Read %d bytes.\n", len); 186 #endif /* DEBUG */ 187 if (len < 0) { 188 if (errno == EAGAIN) { 189 fprintf(stderr, "(EAGAIN) - push 'Play'?\n"); 190 if (len <= 0) 191 continue; 192 } else 193 err(1, "read failed"); 194 } 195 ptr = (uint32_t *) buf; 196 197 do { 198 pkt = (struct fw_pkt *) ptr; 199 #if DEBUG 200 fprintf(stderr, "\nReading new packet.\n"); 201 fprintf(stderr, "%08x %08x %08x %08x\n", 202 htonl(ptr[0]), htonl(ptr[1]), 203 htonl(ptr[2]), htonl(ptr[3])); 204 #endif /* DEBUG */ 205 /* there is no CRC in the 1394 header */ 206 ciph = (struct ciphdr *)(ptr + 1); /* skip iso header */ 207 if (ciph->fmt != CIP_FMT_MPEG) 208 errx(1, "unknown format 0x%x", ciph->fmt); 209 if (ciph->fn != 3) { 210 errx(1, 211 "unsupported MPEG TS stream, fn=%d (only fn=3 is supported)", 212 ciph->fn); 213 } 214 ptr = (uint32_t *) (ciph + 1); /* skip cip header */ 215 216 if (pkt->mode.stream.len <= sizeof(struct ciphdr)) { 217 /* no payload */ 218 /* tlen needs to be decremented before end of the loop */ 219 goto next; 220 } 221 #if DEBUG 222 else { 223 fprintf(stderr, 224 "Packet net payload length (IEEE1394 header): %d\n", 225 pkt->mode.stream.len - sizeof(struct ciphdr)); 226 fprintf(stderr, "Data block size (CIP header): %d [q], %d [B]\n", 227 ciph->len, ciph->len * 4); 228 fprintf(stderr, 229 "Data fraction number (CIP header): %d => DBC increments with %d\n", 230 ciph->fn, (1<<ciph->fn) ); 231 fprintf(stderr, "QCP (CIP header): %d\n", ciph->qpc ); 232 fprintf(stderr, "DBC counter (CIP header): %d\n", ciph->dbc ); 233 fprintf(stderr, "MPEG payload type size: %d\n", 234 sizeof(struct mpeg_pldt)); 235 } 236 #endif /* DEBUG */ 237 238 /* This is a condition that needs to be satisfied to start 239 writing the data */ 240 if (ciph->dbc % (1<<ciph->fn) == 0) 241 startwr = 1; 242 /* Read out all the MPEG TS data blocks from current packet */ 243 for (pld = (struct mpeg_pldt *)ptr; 244 (intptr_t)pld < (intptr_t)((char *)ptr + 245 pkt->mode.stream.len - sizeof(struct ciphdr)); 246 pld++) { 247 if (startwr == 1) 248 write(fd, pld->payload, 249 sizeof(pld->payload)); 250 } 251 252 next: 253 /* CRCs are removed from both header and trailer 254 so that only 4 bytes of 1394 header remains */ 255 pkt_size = pkt->mode.stream.len + 4; 256 ptr = (uint32_t *)((intptr_t)pkt + pkt_size); 257 tlen -= pkt_size; 258 } while (tlen > 0); 259 #if DEBUG 260 fprintf(stderr, "\nReading a data from firewire.\n"); 261 #endif /* DEBUG */ 262 263 } 264 if (fd != STDOUT_FILENO) 265 close(fd); 266 fprintf(stderr, "\n"); 267 } 268