1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (C) 2005
5 * Petr Holub, Hidetoshi Shimokawa. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 *
18 * This product includes software developed by Hidetoshi Shimokawa.
19 *
20 * 4. Neither the name of the author nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 */
37 #include <sys/param.h>
38 #include <sys/ioctl.h>
39 #include <sys/time.h>
40 #include <sys/types.h>
41 #include <sys/uio.h>
42 #include <arpa/inet.h>
43 #include <err.h>
44 #include <errno.h>
45 #include <unistd.h>
46 #include <fcntl.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include <sysexits.h>
51
52 #if defined(__FreeBSD__)
53 #include <dev/firewire/firewire.h>
54 #include <dev/firewire/iec68113.h>
55 #elif defined(__NetBSD__)
56 #include <dev/ieee1394/firewire.h>
57 #include <dev/ieee1394/iec68113.h>
58 #else
59 #warning "You need to add support for your OS"
60 #endif
61
62
63 #include "fwmethods.h"
64
65 #define DEBUG 0
66
67 /*****************************************************************************
68
69 MPEG-2 Transport Stream (MPEG TS) packet format according to IEC 61883:
70
71 31 15 0
72 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ --------
73 | len |tag| channel | tcode | sy |
74 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1394
75 | header_CRC |
76 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ --------
77 |0|0| sid | dbs |fn | qpc |S|RSV| dbc |
78 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ CIP
79 |1|0| fmt | fdf | fdf/syt |
80 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ --------
81 | reserved | cycle_count | cycle_offset |
82 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
83 | | N x
84 . . MPEG
85 . MPEG TS payload 188 bytes .
86 . .
87 | |
88 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ --------
89 | data_CRC |
90 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
91
92 N.b. that CRCs are removed by firewire layer!
93
94 The following fields are fixed for IEEE-1394:
95 tag = 01b
96 tcode = 1010b
97 The length is payload length, i.e. includes CIP header and data size.
98
99 The following fields are constant for MPEG TS:
100 sph = 1 (denoted as S in CIP header above)
101 dbs = 6
102 fmt = (1<<5)
103 fdf = reserved
104 In the supported streams we also require
105 qpc = 0
106 fn = 3
107 and thus the payload is divided in 8 blocks as follows:
108
109 +-----+-----+-----+-----+-----+-----+-----+-----+
110 | db0 | db1 | db2 | db3 | db4 | db5 | db6 | db7 |
111 +-----+-----+-----+-----+-----+-----+-----+-----+
112
113 We have several cases of payload distribution based on stream
114 bandwidth (R):
115 1) R < 1.5 Mbps: any of db0..db7 may be payload,
116 2) 1.5 < R < 3 Mbps: db0/db1 or db2/db3 or db4/db5 or db6/db7 is payload,
117 3) 3 < R < 6 Mbps: db0/db1/db2/db3 or db4/db5/db6/db7 is payload,
118 4) R > 6 Mbps: all db0..db7 contain the payload.
119 Currently, only case (4) is supported in fwmpegts.c
120
121 Each packet may contain N MPEG TS data blocks with timestamp header,
122 which are (4+188)B long. Experimentally, the N ranges from 0 through 3.
123
124 *****************************************************************************/
125
126
127 typedef uint8_t mpeg_ts_pld[188];
128
129 struct mpeg_pldt {
130 #if BYTE_ORDER == BIG_ENDIAN
131 uint32_t :7,
132 c_count:13,
133 c_offset:12;
134 #else /* BYTE_ORDER != BIG_ENDIAN */
135 uint32_t c_offset:12,
136 c_count:13,
137 :7;
138 #endif /* BYTE_ORDER == BIG_ENDIAN */
139 mpeg_ts_pld payload;
140 };
141
142
143 #define NCHUNK 8
144 #define PSIZE 596
145 #define NPACKET_R 4096
146 #define RBUFSIZE (PSIZE * NPACKET_R)
147
148 void
mpegtsrecv(int d,const char * filename,char ich,int count)149 mpegtsrecv(int d, const char *filename, char ich, int count)
150 {
151 struct ciphdr *ciph;
152 struct fw_isochreq isoreq;
153 struct fw_isobufreq bufreq;
154 struct fw_pkt *pkt;
155 struct mpeg_pldt *pld;
156 uint32_t *ptr;
157 int fd, k, len, m, pkt_size, startwr, tlen;
158 char *buf;
159
160 startwr = 0;
161
162 if (strcmp(filename, "-") == 0)
163 fd = STDOUT_FILENO;
164 else {
165 fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0660);
166 if (fd == -1)
167 err(EX_NOINPUT, "%s", filename);
168 }
169 buf = malloc(RBUFSIZE);
170
171 bufreq.rx.nchunk = NCHUNK;
172 bufreq.rx.npacket = NPACKET_R;
173 bufreq.rx.psize = PSIZE;
174 bufreq.tx.nchunk = 0;
175 bufreq.tx.npacket = 0;
176 bufreq.tx.psize = 0;
177 if (ioctl(d, FW_SSTBUF, &bufreq) < 0)
178 err(1, "ioctl");
179
180 isoreq.ch = ich & 0x3f;
181 isoreq.tag = (ich >> 6) & 3;
182
183 if (ioctl(d, FW_SRSTREAM, &isoreq) < 0)
184 err(1, "ioctl");
185
186 k = m = 0;
187 while (count <= 0 || k <= count) {
188 len = tlen = read(d, buf, RBUFSIZE);
189 #if DEBUG
190 fprintf(stderr, "Read %d bytes.\n", len);
191 #endif /* DEBUG */
192 if (len < 0) {
193 if (errno == EAGAIN) {
194 fprintf(stderr, "(EAGAIN) - push 'Play'?\n");
195 continue;
196 }
197 err(1, "read failed");
198 }
199 ptr = (uint32_t *) buf;
200
201 do {
202 pkt = (struct fw_pkt *) ptr;
203 #if DEBUG
204 fprintf(stderr, "\nReading new packet.\n");
205 fprintf(stderr, "%08x %08x %08x %08x\n",
206 htonl(ptr[0]), htonl(ptr[1]),
207 htonl(ptr[2]), htonl(ptr[3]));
208 #endif /* DEBUG */
209 /* there is no CRC in the 1394 header */
210 ciph = (struct ciphdr *)(ptr + 1); /* skip iso header */
211 if (ciph->fmt != CIP_FMT_MPEG)
212 errx(1, "unknown format 0x%x", ciph->fmt);
213 if (ciph->fn != 3) {
214 errx(1,
215 "unsupported MPEG TS stream, fn=%d (only fn=3 is supported)",
216 ciph->fn);
217 }
218 ptr = (uint32_t *) (ciph + 1); /* skip cip header */
219
220 if (pkt->mode.stream.len <= sizeof(struct ciphdr)) {
221 /* no payload */
222 /* tlen needs to be decremented before end of the loop */
223 goto next;
224 }
225 #if DEBUG
226 else {
227 fprintf(stderr,
228 "Packet net payload length (IEEE1394 header): %d\n",
229 pkt->mode.stream.len - sizeof(struct ciphdr));
230 fprintf(stderr, "Data block size (CIP header): %d [q], %d [B]\n",
231 ciph->len, ciph->len * 4);
232 fprintf(stderr,
233 "Data fraction number (CIP header): %d => DBC increments with %d\n",
234 ciph->fn, (1<<ciph->fn) );
235 fprintf(stderr, "QCP (CIP header): %d\n", ciph->qpc );
236 fprintf(stderr, "DBC counter (CIP header): %d\n", ciph->dbc );
237 fprintf(stderr, "MPEG payload type size: %d\n",
238 sizeof(struct mpeg_pldt));
239 }
240 #endif /* DEBUG */
241
242 /* This is a condition that needs to be satisfied to start
243 writing the data */
244 if (ciph->dbc % (1<<ciph->fn) == 0)
245 startwr = 1;
246 /* Read out all the MPEG TS data blocks from current packet */
247 for (pld = (struct mpeg_pldt *)ptr;
248 (intptr_t)pld < (intptr_t)((char *)ptr +
249 pkt->mode.stream.len - sizeof(struct ciphdr));
250 pld++) {
251 if (startwr == 1)
252 write(fd, pld->payload,
253 sizeof(pld->payload));
254 }
255
256 next:
257 /* CRCs are removed from both header and trailer
258 so that only 4 bytes of 1394 header remains */
259 pkt_size = pkt->mode.stream.len + 4;
260 ptr = (uint32_t *)((intptr_t)pkt + pkt_size);
261 tlen -= pkt_size;
262 } while (tlen > 0);
263 #if DEBUG
264 fprintf(stderr, "\nReading a data from firewire.\n");
265 #endif /* DEBUG */
266
267 }
268 if (fd != STDOUT_FILENO)
269 close(fd);
270 fprintf(stderr, "\n");
271 }
272