fwmpegts.c revision 293290 
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: stable/10/usr.sbin/fwcontrol/fwmpegts.c 293290 2016-01-07 00:40:51Z bdrewery $
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
72MPEG-2 Transport Stream (MPEG TS) packet format according to IEC 61883:
73
7431                              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
95N.b. that CRCs are removed by firewire layer!
96
97The following fields are fixed for IEEE-1394:
98tag = 01b
99tcode = 1010b
100The length is payload length, i.e. includes CIP header and data size.
101
102The following fields are constant for MPEG TS:
103sph = 1 (denoted as S in CIP header above)
104dbs = 6
105fmt = (1<<5)
106fdf = reserved
107In the supported streams we also require
108qpc = 0
109fn = 3
110and thus the payload is divided in 8 blocks as follows:
111
112  +-----+-----+-----+-----+-----+-----+-----+-----+
113  | db0 | db1 | db2 | db3 | db4 | db5 | db6 | db7 |
114  +-----+-----+-----+-----+-----+-----+-----+-----+
115
116We have several cases of payload distribution based on stream
117bandwidth (R):
1181) R < 1.5 Mbps: any of db0..db7 may be payload,
1192) 1.5 < R < 3 Mbps: db0/db1 or db2/db3 or db4/db5 or db6/db7 is payload,
1203) 3 < R < 6 Mbps: db0/db1/db2/db3 or db4/db5/db6/db7 is payload,
1214) R > 6 Mbps: all db0..db7 contain the payload.
122Currently, only case (4) is supported in fwmpegts.c
123
124Each packet may contain N  MPEG TS data blocks with timestamp header,
125which are (4+188)B long. Experimentally, the N ranges from 0 through 3.
126
127*****************************************************************************/
128
129
130typedef uint8_t mpeg_ts_pld[188];
131
132struct 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
151void
152mpegtsrecv(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
259next:
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