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 #if defined(__FreeBSD__) 56 #include <dev/firewire/firewire.h> 57 #include <dev/firewire/iec68113.h> 58 #elif defined(__NetBSD__) 59 #include <dev/ieee1394/firewire.h> 60 #include <dev/ieee1394/iec68113.h> 61 #else 62 #warning "You need to add support for your OS" 63 #endif 64 65 66 #include "fwmethods.h" 67 68 #define DEBUG 0 69 70 /***************************************************************************** 71 72 MPEG-2 Transport Stream (MPEG TS) packet format according to IEC 61883: 73 74 31 15 0 75 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -------- 76 | len |tag| channel | tcode | sy | 77 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1394 78 | header_CRC | 79 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -------- 80 |0|0| sid | dbs |fn | qpc |S|RSV| dbc | 81 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ CIP 82 |1|0| fmt | fdf | fdf/syt | 83 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -------- 84 | reserved | cycle_count | cycle_offset | 85 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 86 | | N x 87 . . MPEG 88 . MPEG TS payload 188 bytes . 89 . . 90 | | 91 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -------- 92 | data_CRC | 93 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 94 95 N.b. that CRCs are removed by firewire layer! 96 97 The following fields are fixed for IEEE-1394: 98 tag = 01b 99 tcode = 1010b 100 The length is payload length, i.e. includes CIP header and data size. 101 102 The following fields are constant for MPEG TS: 103 sph = 1 (denoted as S in CIP header above) 104 dbs = 6 105 fmt = (1<<5) 106 fdf = reserved 107 In the supported streams we also require 108 qpc = 0 109 fn = 3 110 and thus the payload is divided in 8 blocks as follows: 111 112 +-----+-----+-----+-----+-----+-----+-----+-----+ 113 | db0 | db1 | db2 | db3 | db4 | db5 | db6 | db7 | 114 +-----+-----+-----+-----+-----+-----+-----+-----+ 115 116 We have several cases of payload distribution based on stream 117 bandwidth (R): 118 1) R < 1.5 Mbps: any of db0..db7 may be payload, 119 2) 1.5 < R < 3 Mbps: db0/db1 or db2/db3 or db4/db5 or db6/db7 is payload, 120 3) 3 < R < 6 Mbps: db0/db1/db2/db3 or db4/db5/db6/db7 is payload, 121 4) R > 6 Mbps: all db0..db7 contain the payload. 122 Curently, only case (4) is supported in fwmpegts.c 123 124 Each packet may contain N MPEG TS data blocks with timestamp header, 125 which are (4+188)B long. Experimentally, the N ranges from 0 through 3. 126 127 *****************************************************************************/ 128 129 130 typedef uint8_t mpeg_ts_pld[188]; 131 132 struct mpeg_pldt { 133 #if BYTE_ORDER == BIG_ENDIAN 134 uint32_t :7, 135 c_count:13, 136 c_offset:12; 137 #else /* BYTE_ORDER != BIG_ENDIAN */ 138 uint32_t c_offset:12, 139 c_count:13, 140 :7; 141 #endif /* BYTE_ORDER == BIG_ENDIAN */ 142 mpeg_ts_pld payload; 143 }; 144 145 146 #define NCHUNK 8 147 #define PSIZE 596 148 #define NPACKET_R 4096 149 #define RBUFSIZE (PSIZE * NPACKET_R) 150 151 void 152 mpegtsrecv(int d, const char *filename, char ich, int count) 153 { 154 struct ciphdr *ciph; 155 struct fw_isochreq isoreq; 156 struct fw_isobufreq bufreq; 157 struct fw_pkt *pkt; 158 struct mpeg_pldt *pld; 159 uint32_t *ptr; 160 int fd, k, len, m, pkt_size, startwr, tlen; 161 char *buf; 162 163 startwr = 0; 164 165 if (strcmp(filename, "-") == 0) 166 fd = STDOUT_FILENO; 167 else { 168 fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0660); 169 if (fd == -1) 170 err(EX_NOINPUT, "%s", filename); 171 } 172 buf = malloc(RBUFSIZE); 173 174 bufreq.rx.nchunk = NCHUNK; 175 bufreq.rx.npacket = NPACKET_R; 176 bufreq.rx.psize = PSIZE; 177 bufreq.tx.nchunk = 0; 178 bufreq.tx.npacket = 0; 179 bufreq.tx.psize = 0; 180 if (ioctl(d, FW_SSTBUF, &bufreq) < 0) 181 err(1, "ioctl"); 182 183 isoreq.ch = ich & 0x3f; 184 isoreq.tag = (ich >> 6) & 3; 185 186 if (ioctl(d, FW_SRSTREAM, &isoreq) < 0) 187 err(1, "ioctl"); 188 189 k = m = 0; 190 while (count <= 0 || k <= count) { 191 len = tlen = read(d, buf, RBUFSIZE); 192 #if DEBUG 193 fprintf(stderr, "Read %d bytes.\n", len); 194 #endif /* DEBUG */ 195 if (len < 0) { 196 if (errno == EAGAIN) { 197 fprintf(stderr, "(EAGAIN) - push 'Play'?\n"); 198 continue; 199 } 200 err(1, "read failed"); 201 } 202 ptr = (uint32_t *) buf; 203 204 do { 205 pkt = (struct fw_pkt *) ptr; 206 #if DEBUG 207 fprintf(stderr, "\nReading new packet.\n"); 208 fprintf(stderr, "%08x %08x %08x %08x\n", 209 htonl(ptr[0]), htonl(ptr[1]), 210 htonl(ptr[2]), htonl(ptr[3])); 211 #endif /* DEBUG */ 212 /* there is no CRC in the 1394 header */ 213 ciph = (struct ciphdr *)(ptr + 1); /* skip iso header */ 214 if (ciph->fmt != CIP_FMT_MPEG) 215 errx(1, "unknown format 0x%x", ciph->fmt); 216 if (ciph->fn != 3) { 217 errx(1, 218 "unsupported MPEG TS stream, fn=%d (only fn=3 is supported)", 219 ciph->fn); 220 } 221 ptr = (uint32_t *) (ciph + 1); /* skip cip header */ 222 223 if (pkt->mode.stream.len <= sizeof(struct ciphdr)) { 224 /* no payload */ 225 /* tlen needs to be decremented before end of the loop */ 226 goto next; 227 } 228 #if DEBUG 229 else { 230 fprintf(stderr, 231 "Packet net payload length (IEEE1394 header): %d\n", 232 pkt->mode.stream.len - sizeof(struct ciphdr)); 233 fprintf(stderr, "Data block size (CIP header): %d [q], %d [B]\n", 234 ciph->len, ciph->len * 4); 235 fprintf(stderr, 236 "Data fraction number (CIP header): %d => DBC increments with %d\n", 237 ciph->fn, (1<<ciph->fn) ); 238 fprintf(stderr, "QCP (CIP header): %d\n", ciph->qpc ); 239 fprintf(stderr, "DBC counter (CIP header): %d\n", ciph->dbc ); 240 fprintf(stderr, "MPEG payload type size: %d\n", 241 sizeof(struct mpeg_pldt)); 242 } 243 #endif /* DEBUG */ 244 245 /* This is a condition that needs to be satisfied to start 246 writing the data */ 247 if (ciph->dbc % (1<<ciph->fn) == 0) 248 startwr = 1; 249 /* Read out all the MPEG TS data blocks from current packet */ 250 for (pld = (struct mpeg_pldt *)ptr; 251 (intptr_t)pld < (intptr_t)((char *)ptr + 252 pkt->mode.stream.len - sizeof(struct ciphdr)); 253 pld++) { 254 if (startwr == 1) 255 write(fd, pld->payload, 256 sizeof(pld->payload)); 257 } 258 259 next: 260 /* CRCs are removed from both header and trailer 261 so that only 4 bytes of 1394 header remains */ 262 pkt_size = pkt->mode.stream.len + 4; 263 ptr = (uint32_t *)((intptr_t)pkt + pkt_size); 264 tlen -= pkt_size; 265 } while (tlen > 0); 266 #if DEBUG 267 fprintf(stderr, "\nReading a data from firewire.\n"); 268 #endif /* DEBUG */ 269 270 } 271 if (fd != STDOUT_FILENO) 272 close(fd); 273 fprintf(stderr, "\n"); 274 } 275