| /* $NetBSD: fwmpegts.c,v 1.4 2011/01/04 20:45:13 christos Exp $ */ | |
| /* | |
| * 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: src/usr.sbin/fwcontrol/fwmpegts.c,v 1.3 2009/02/02 21:05:12 sbruno Exp $ | |
| */ | |
| /***************************************************************************** | |
| 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 { | |
| uint32_t :7, | |
| c_count:13, | |
| c_offset:12; | |
| uint32_t c_offset:12, | |
| c_count:13, | |
| :7; | |
| mpeg_ts_pld payload; | |
| }; | |
| 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, "%s: %s", __func__, 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(EXIT_FAILURE, "%s: ioctl", __func__); | |
| isoreq.ch = ich & 0x3f; | |
| isoreq.tag = (ich >> 6) & 3; | |
| if (ioctl(d, FW_SRSTREAM, &isoreq) < 0) | |
| err(EXIT_FAILURE, "%s: ioctl", __func__); | |
| k = m = 0; | |
| while (count <= 0 || k <= count) { | |
| len = tlen = read(d, buf, RBUFSIZE); | |
| fprintf(stderr, "Read %d bytes.\n", len); | |
| if (len < 0) { | |
| if (errno == EAGAIN) { | |
| fprintf(stderr, "(EAGAIN) - push 'Play'?\n"); | |
| continue; | |
| } | |
| err(EXIT_FAILURE, "read failed"); | |
| } | |
| ptr = (uint32_t *) buf; | |
| do { | |
| pkt = (struct fw_pkt *) ptr; | |
| 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])); | |
| /* there is no CRC in the 1394 header */ | |
| ciph = (struct ciphdr *)(ptr + 1); /* skip iso header */ | |
| if (ciph->fmt != CIP_FMT_MPEG) | |
| errx(EXIT_FAILURE, | |
| "%s: unknown format 0x%x", __func__, | |
| ciph->fmt); | |
| if (ciph->fn != 3) { | |
| errx(EXIT_FAILURE, | |
| "%s: unsupported MPEG TS stream, " | |
| "fn=%d (only fn=3 is supported)", | |
| __func__, 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; | |
| } | |
| 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)); | |
| } | |
| /* 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); | |
| fprintf(stderr, "\nReading a data from firewire.\n"); | |
| } | |
| if (fd != STDOUT_FILENO) | |
| close(fd); | |
| fprintf(stderr, "\n"); | |
| } | |