diff options
Diffstat (limited to 'usr.sbin/fwcontrol/fwmpegts.c')
| -rw-r--r-- | usr.sbin/fwcontrol/fwmpegts.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/usr.sbin/fwcontrol/fwmpegts.c b/usr.sbin/fwcontrol/fwmpegts.c new file mode 100644 index 0000000..4ad8432 --- /dev/null +++ b/usr.sbin/fwcontrol/fwmpegts.c @@ -0,0 +1,267 @@ +/* + * Copyright (C) 2005 + * Petr Holub, Hidetoshi Shimokawa. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * + * This product includes software developed by Hidetoshi Shimokawa. + * + * 4. Neither the name of the author nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ +#include <sys/param.h> +#include <sys/ioctl.h> +#include <sys/time.h> +#include <sys/types.h> +#include <sys/uio.h> + +#if __FreeBSD_version >= 500000 +#include <arpa/inet.h> +#endif + +#include <err.h> +#include <errno.h> +#include <unistd.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sysexits.h> + +#include <dev/firewire/firewire.h> +#include <dev/firewire/iec68113.h> + +#include "fwmethods.h" + +#define DEBUG 0 + +/***************************************************************************** + +MPEG-2 Transport Stream (MPEG TS) packet format according to IEC 61883: + +31 15 0 ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -------- +| len |tag| channel | tcode | sy | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1394 +| header_CRC | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -------- +|0|0| sid | dbs |fn | qpc |S|RSV| dbc | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ CIP +|1|0| fmt | fdf | fdf/syt | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -------- +| reserved | cycle_count | cycle_offset | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| | N x +. . MPEG +. MPEG TS payload 188 bytes . +. . +| | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -------- +| data_CRC | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + +N.b. that CRCs are removed by firewire layer! + +The following fiels are fixed for IEEE-1394: +tag = 01b +tcode = 1010b +The length is payload length, i.e. includes CIP header and data size. + +The following fields are constant for MPEG TS: +sph = 1 (denoted as S in CIP header above) +dbs = 6 +fmt = (1<<5) +fdf = reserved +In the supported streams we also require +qpc = 0 +fn = 3 +and thus the payload is divided in 8 blocks as follows: + + +-----+-----+-----+-----+-----+-----+-----+-----+ + | db0 | db1 | db2 | db3 | db4 | db5 | db6 | db7 | + +-----+-----+-----+-----+-----+-----+-----+-----+ + +We have several cases of payload distribution based on stream +bandwidth (R): +1) R < 1.5 Mbps: any of db0..db7 may be payload, +2) 1.5 < R < 3 Mbps: db0/db1 or db2/db3 or db4/db5 or db6/db7 is payload, +3) 3 < R < 6 Mbps: db0/db1/db2/db3 or db4/db5/db6/db7 is payload, +4) R > 6 Mbps: all db0..db7 contain the payload. +Curently, only case (4) is supported in fwmpegts.c + +Each packet may contain N MPEG TS data blocks with timestamp header, +which are (4+188)B long. Experimentally, the N ranges from 0 through 3. + +*****************************************************************************/ + + +typedef uint8_t mpeg_ts_pld[188]; + +struct mpeg_pldt { +#if BYTE_ORDER == BIG_ENDIAN + uint32_t :7, + c_count:13, + c_offset:12; +#else /* BYTE_ORDER != BIG_ENDIAN */ + uint32_t c_offset:12, + c_count:13, + :7; +#endif /* BYTE_ORDER == BIG_ENDIAN */ + mpeg_ts_pld payload; +}; + + +#define NCHUNK 8 +#define PSIZE 596 +#define NPACKET_R 4096 +#define RBUFSIZE (PSIZE * NPACKET_R) + +void +mpegtsrecv(int d, const char *filename, char ich, int count) +{ + struct ciphdr *ciph; + struct fw_isochreq isoreq; + struct fw_isobufreq bufreq; + struct fw_pkt *pkt; + struct mpeg_pldt *pld; + uint32_t *ptr; + int fd, k, len, m, pkt_size, startwr, tlen; + char *buf; + + startwr = 0; + + if (strcmp(filename, "-") == 0) + fd = STDOUT_FILENO; + else { + fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0660); + if (fd == -1) + err(EX_NOINPUT, filename); + } + buf = malloc(RBUFSIZE); + + bufreq.rx.nchunk = NCHUNK; + bufreq.rx.npacket = NPACKET_R; + bufreq.rx.psize = PSIZE; + bufreq.tx.nchunk = 0; + bufreq.tx.npacket = 0; + bufreq.tx.psize = 0; + if (ioctl(d, FW_SSTBUF, &bufreq) < 0) + err(1, "ioctl"); + + isoreq.ch = ich & 0x3f; + isoreq.tag = (ich >> 6) & 3; + + if (ioctl(d, FW_SRSTREAM, &isoreq) < 0) + err(1, "ioctl"); + + k = m = 0; + while (count <= 0 || k <= count) { + len = tlen = read(d, buf, RBUFSIZE); +#if DEBUG + fprintf(stderr, "Read %d bytes.\n", len); +#endif /* DEBUG */ + if (len < 0) { + if (errno == EAGAIN) { + fprintf(stderr, "(EAGAIN) - push 'Play'?\n"); + if (len <= 0) + continue; + } else + err(1, "read failed"); + } + ptr = (uint32_t *) buf; + + do { + pkt = (struct fw_pkt *) ptr; +#if DEBUG + fprintf(stderr, "\nReading new packet.\n"); + fprintf(stderr, "%08x %08x %08x %08x\n", + htonl(ptr[0]), htonl(ptr[1]), + htonl(ptr[2]), htonl(ptr[3])); +#endif /* DEBUG */ + /* there is no CRC in the 1394 header */ + ciph = (struct ciphdr *)(ptr + 1); /* skip iso header */ + if (ciph->fmt != CIP_FMT_MPEG) + errx(1, "unknown format 0x%x", ciph->fmt); + if (ciph->fn != 3) { + errx(1, + "unsupported MPEG TS stream, fn=%d (only fn=3 is supported)", + ciph->fn); + } + ptr = (uint32_t *) (ciph + 1); /* skip cip header */ + + if (pkt->mode.stream.len <= sizeof(struct ciphdr)) { + /* no payload */ + /* tlen needs to be decremented before end of the loop */ + goto next; + } +#if DEBUG + else { + fprintf(stderr, + "Packet net payload length (IEEE1394 header): %d\n", + pkt->mode.stream.len - sizeof(struct ciphdr)); + fprintf(stderr, "Data block size (CIP header): %d [q], %d [B]\n", + ciph->len, ciph->len * 4); + fprintf(stderr, + "Data fraction number (CIP header): %d => DBC increments with %d\n", + ciph->fn, (1<<ciph->fn) ); + fprintf(stderr, "QCP (CIP header): %d\n", ciph->qpc ); + fprintf(stderr, "DBC counter (CIP header): %d\n", ciph->dbc ); + fprintf(stderr, "MPEG payload type size: %d\n", + sizeof(struct mpeg_pldt)); + } +#endif /* DEBUG */ + + /* This is a condition that needs to be satisfied to start + writing the data */ + if (ciph->dbc % (1<<ciph->fn) == 0) + startwr = 1; + /* Read out all the MPEG TS data blocks from current packet */ + for (pld = (struct mpeg_pldt *)ptr; + (intptr_t)pld < (intptr_t)((char *)ptr + + pkt->mode.stream.len - sizeof(struct ciphdr)); + pld++) { + if (startwr == 1) + write(fd, pld->payload, + sizeof(pld->payload)); + } + +next: + /* CRCs are removed from both header and trailer + so that only 4 bytes of 1394 header remains */ + pkt_size = pkt->mode.stream.len + 4; + ptr = (uint32_t *)((intptr_t)pkt + pkt_size); + tlen -= pkt_size; + } while (tlen > 0); +#if DEBUG + fprintf(stderr, "\nReading a data from firewire.\n"); +#endif /* DEBUG */ + + } + if (fd != STDOUT_FILENO) + close(fd); + fprintf(stderr, "\n"); +} |
