268 lines
8.5 KiB
C
268 lines
8.5 KiB
C
/*
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* Copyright (C) 2005
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* Petr Holub, Hidetoshi Shimokawa. 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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*
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* This product includes software developed by Hidetoshi Shimokawa.
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*
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* 4. Neither the name of the author nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#if __FreeBSD_version >= 500000
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#include <arpa/inet.h>
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#endif
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#include <err.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <dev/firewire/firewire.h>
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#include <dev/firewire/iec68113.h>
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#include "fwmethods.h"
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#define DEBUG 0
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/*****************************************************************************
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MPEG-2 Transport Stream (MPEG TS) packet format according to IEC 61883:
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31 15 0
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ --------
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| len |tag| channel | tcode | sy |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1394
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| header_CRC |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ --------
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|0|0| sid | dbs |fn | qpc |S|RSV| dbc |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ CIP
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|1|0| fmt | fdf | fdf/syt |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ --------
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| reserved | cycle_count | cycle_offset |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| | N x
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. . MPEG
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. MPEG TS payload 188 bytes .
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. .
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ --------
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| data_CRC |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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N.b. that CRCs are removed by firewire layer!
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The following fiels are fixed for IEEE-1394:
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tag = 01b
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tcode = 1010b
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The length is payload length, i.e. includes CIP header and data size.
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The following fields are constant for MPEG TS:
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sph = 1 (denoted as S in CIP header above)
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dbs = 6
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fmt = (1<<5)
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fdf = reserved
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In the supported streams we also require
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qpc = 0
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fn = 3
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and thus the payload is divided in 8 blocks as follows:
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+-----+-----+-----+-----+-----+-----+-----+-----+
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| db0 | db1 | db2 | db3 | db4 | db5 | db6 | db7 |
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+-----+-----+-----+-----+-----+-----+-----+-----+
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We have several cases of payload distribution based on stream
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bandwidth (R):
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1) R < 1.5 Mbps: any of db0..db7 may be payload,
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2) 1.5 < R < 3 Mbps: db0/db1 or db2/db3 or db4/db5 or db6/db7 is payload,
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3) 3 < R < 6 Mbps: db0/db1/db2/db3 or db4/db5/db6/db7 is payload,
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4) R > 6 Mbps: all db0..db7 contain the payload.
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Curently, only case (4) is supported in fwmpegts.c
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Each packet may contain N MPEG TS data blocks with timestamp header,
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which are (4+188)B long. Experimentally, the N ranges from 0 through 3.
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*****************************************************************************/
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typedef uint8_t mpeg_ts_pld[188];
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struct mpeg_pldt {
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#if BYTE_ORDER == BIG_ENDIAN
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uint32_t :7,
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c_count:13,
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c_offset:12;
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#else /* BYTE_ORDER != BIG_ENDIAN */
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uint32_t c_offset:12,
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c_count:13,
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:7;
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#endif /* BYTE_ORDER == BIG_ENDIAN */
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mpeg_ts_pld payload;
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};
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#define NCHUNK 8
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#define PSIZE 596
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#define NPACKET_R 4096
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#define RBUFSIZE (PSIZE * NPACKET_R)
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void
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mpegtsrecv(int d, const char *filename, char ich, int count)
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{
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struct ciphdr *ciph;
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struct fw_isochreq isoreq;
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struct fw_isobufreq bufreq;
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struct fw_pkt *pkt;
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struct mpeg_pldt *pld;
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uint32_t *ptr;
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int fd, k, len, m, pkt_size, startwr, tlen;
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char *buf;
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startwr = 0;
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if (strcmp(filename, "-") == 0)
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fd = STDOUT_FILENO;
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else {
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fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0660);
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if (fd == -1)
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err(EX_NOINPUT, filename);
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}
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buf = malloc(RBUFSIZE);
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bufreq.rx.nchunk = NCHUNK;
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bufreq.rx.npacket = NPACKET_R;
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bufreq.rx.psize = PSIZE;
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bufreq.tx.nchunk = 0;
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bufreq.tx.npacket = 0;
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bufreq.tx.psize = 0;
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if (ioctl(d, FW_SSTBUF, &bufreq) < 0)
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err(1, "ioctl");
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isoreq.ch = ich & 0x3f;
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isoreq.tag = (ich >> 6) & 3;
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if (ioctl(d, FW_SRSTREAM, &isoreq) < 0)
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err(1, "ioctl");
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k = m = 0;
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while (count <= 0 || k <= count) {
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len = tlen = read(d, buf, RBUFSIZE);
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#if DEBUG
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fprintf(stderr, "Read %d bytes.\n", len);
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#endif /* DEBUG */
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if (len < 0) {
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if (errno == EAGAIN) {
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fprintf(stderr, "(EAGAIN) - push 'Play'?\n");
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if (len <= 0)
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continue;
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} else
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err(1, "read failed");
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}
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ptr = (uint32_t *) buf;
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do {
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pkt = (struct fw_pkt *) ptr;
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#if DEBUG
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fprintf(stderr, "\nReading new packet.\n");
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fprintf(stderr, "%08x %08x %08x %08x\n",
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htonl(ptr[0]), htonl(ptr[1]),
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htonl(ptr[2]), htonl(ptr[3]));
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#endif /* DEBUG */
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/* there is no CRC in the 1394 header */
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ciph = (struct ciphdr *)(ptr + 1); /* skip iso header */
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if (ciph->fmt != CIP_FMT_MPEG)
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errx(1, "unknown format 0x%x", ciph->fmt);
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if (ciph->fn != 3) {
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errx(1,
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"unsupported MPEG TS stream, fn=%d (only fn=3 is supported)",
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ciph->fn);
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}
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ptr = (uint32_t *) (ciph + 1); /* skip cip header */
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if (pkt->mode.stream.len <= sizeof(struct ciphdr)) {
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/* no payload */
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/* tlen needs to be decremented before end of the loop */
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goto next;
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}
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#if DEBUG
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else {
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fprintf(stderr,
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"Packet net payload length (IEEE1394 header): %d\n",
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pkt->mode.stream.len - sizeof(struct ciphdr));
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fprintf(stderr, "Data block size (CIP header): %d [q], %d [B]\n",
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ciph->len, ciph->len * 4);
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fprintf(stderr,
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"Data fraction number (CIP header): %d => DBC increments with %d\n",
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ciph->fn, (1<<ciph->fn) );
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fprintf(stderr, "QCP (CIP header): %d\n", ciph->qpc );
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fprintf(stderr, "DBC counter (CIP header): %d\n", ciph->dbc );
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fprintf(stderr, "MPEG payload type size: %d\n",
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sizeof(struct mpeg_pldt));
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}
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#endif /* DEBUG */
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/* This is a condition that needs to be satisfied to start
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writing the data */
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if (ciph->dbc % (1<<ciph->fn) == 0)
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startwr = 1;
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/* Read out all the MPEG TS data blocks from current packet */
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for (pld = (struct mpeg_pldt *)ptr;
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(intptr_t)pld < (intptr_t)((char *)ptr +
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pkt->mode.stream.len - sizeof(struct ciphdr));
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pld++) {
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if (startwr == 1)
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write(fd, pld->payload,
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sizeof(pld->payload));
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}
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next:
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/* CRCs are removed from both header and trailer
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so that only 4 bytes of 1394 header remains */
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pkt_size = pkt->mode.stream.len + 4;
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ptr = (uint32_t *)((intptr_t)pkt + pkt_size);
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tlen -= pkt_size;
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} while (tlen > 0);
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#if DEBUG
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fprintf(stderr, "\nReading a data from firewire.\n");
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#endif /* DEBUG */
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}
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if (fd != STDOUT_FILENO)
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close(fd);
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fprintf(stderr, "\n");
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}
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