/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (C) 2003
 *      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.
 */
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <arpa/inet.h>
#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
#define FIX_FRAME       1

struct frac {
        int n,d;
};

struct frac frame_cycle[2]  = {
        {8000*100, 2997},       /* NTSC 8000 cycle / 29.97 Hz */
        {320, 1},               /* PAL  8000 cycle / 25 Hz */
};
int npackets[] = {
        250             /* NTSC */,
        300             /* PAL */
};
struct frac pad_rate[2]  = {
        {203, 2997},    /* = (8000 - 29.97 * 250)/(29.97 * 250) */
        {1, 15},        /* = (8000 - 25 * 300)/(25 * 300) */
};
char *system_name[] = {"NTSC", "PAL"};
int frame_rate[] = {30, 25};

#define PSIZE 512
#define DSIZE 480
#define NCHUNK 64

#define NPACKET_R 256
#define NPACKET_T 255
#define TNBUF 100       /* XXX too large value causes block noise */
#define NEMPTY 10       /* depends on TNBUF */
#define RBUFSIZE (PSIZE * NPACKET_R)
#define MAXBLOCKS (300)
#define CYCLE_FRAC 0xc00

void
dvrecv(int d, const char *filename, char ich, int count)
{
        struct fw_isochreq isoreq;
        struct fw_isobufreq bufreq;
        struct dvdbc *dv;
        struct ciphdr *ciph;
        struct fw_pkt *pkt;
        char *pad, *buf;
        u_int32_t *ptr;
        int len, tlen, npad, fd, k, m, vec, system = -1, nb;
        int nblocks[] = {250 /* NTSC */, 300 /* PAL */};
        struct iovec wbuf[NPACKET_R];

        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", filename);
        }
        buf = malloc(RBUFSIZE);
        pad = malloc(DSIZE*MAXBLOCKS);
        memset(pad, 0xff, DSIZE*MAXBLOCKS);
        bzero(wbuf, sizeof(wbuf));

        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 FW_SSTBUF");

        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) {
#if 0
                tlen = 0;
                while ((len = read(d, buf + tlen, PSIZE
                                                /* RBUFSIZE - tlen */)) > 0) {
                        if (len < 0) {
                                if (errno == EAGAIN) {
                                        fprintf(stderr, "(EAGAIN)\n");
                                        fflush(stderr);
                                        if (len <= 0)
                                                continue;
                                } else
                                        err(1, "read failed");
                        }
                        tlen += len;
                        if ((RBUFSIZE - tlen) < PSIZE)
                                break;
                };
#else
                tlen = len = read(d, buf, RBUFSIZE);
                if (len < 0) {
                        if (errno == EAGAIN) {
                                fprintf(stderr, "(EAGAIN) - push 'Play'?\n");
                                fflush(stderr);
                                if (len <= 0)
                                        continue;
                        } else
                                err(1, "read failed");
                }
#endif
                vec = 0;
                ptr = (u_int32_t *) buf;
again:
                pkt = (struct fw_pkt *) ptr;
#if DEBUG
                fprintf(stderr, "%08x %08x %08x %08x\n",
                        htonl(ptr[0]), htonl(ptr[1]),
                        htonl(ptr[2]), htonl(ptr[3]));
#endif
                ciph = (struct ciphdr *)(ptr + 1);      /* skip iso header */
                if (ciph->fmt != CIP_FMT_DVCR)
                        errx(1, "unknown format 0x%x", ciph->fmt);
                ptr = (u_int32_t *) (ciph + 1);         /* skip cip header */
#if DEBUG
                if (ciph->fdf.dv.cyc != 0xffff && k == 0) {
                        fprintf(stderr, "0x%04x\n", ntohs(ciph->fdf.dv.cyc));
                }
#endif
                if (pkt->mode.stream.len <= sizeof(struct ciphdr))
                        /* no payload */
                        goto next;
                for (dv = (struct dvdbc *)ptr;
                                (char *)dv < (char *)(ptr + ciph->len);
                                dv+=6) {

#if DEBUG
                        fprintf(stderr, "(%d,%d) ", dv->sct, dv->dseq);
#endif
                        if  (dv->sct == DV_SCT_HEADER && dv->dseq == 0) {
                                if (system < 0) {
                                        system = ciph->fdf.dv.fs;
                                        fprintf(stderr, "%s\n", system_name[system]);
                                }

                                /* Fix DSF bit */
                                if (system == 1 &&
                                        (dv->payload[0] & DV_DSF_12) == 0)
                                        dv->payload[0] |= DV_DSF_12;
                                nb = nblocks[system];
                                fprintf(stderr, "%d:%02d:%02d %d\r",
                                        k / (3600 * frame_rate[system]),
                                        (k / (60 * frame_rate[system])) % 60,
                                        (k / frame_rate[system]) % 60,
                                        k % frame_rate[system]);

#if FIX_FRAME
                                if (m > 0 && m != nb) {
                                        /* padding bad frame */
                                        npad = ((nb - m) % nb);
                                        if (npad < 0)
                                                npad += nb;
                                        fprintf(stderr, "\n%d blocks padded\n",
                                            npad);
                                        npad *= DSIZE;
                                        wbuf[vec].iov_base = pad;
                                        wbuf[vec++].iov_len = npad;
                                        if (vec >= NPACKET_R) {
                                                writev(fd, wbuf, vec);
                                                vec = 0;
                                        }
                                }
#endif
                                k++;
                                fflush(stderr);
                                m = 0;
                        }
                        if (k == 0 || (count > 0 && k > count))
                                continue;
                        m++;
                        wbuf[vec].iov_base = (char *) dv;
                        wbuf[vec++].iov_len = DSIZE;
                        if (vec >= NPACKET_R) {
                                writev(fd, wbuf, vec);
                                vec = 0;
                        }
                }
                ptr = (u_int32_t *)dv;
next:
                if ((char *)ptr < buf + tlen)
                        goto again;
                if (vec > 0)
                        writev(fd, wbuf, vec);
        }
        if (fd != STDOUT_FILENO)
                close(fd);
        fprintf(stderr, "\n");
}


void
dvsend(int d, const char *filename, char ich, int count)
{
        struct fw_isochreq isoreq;
        struct fw_isobufreq bufreq;
        struct dvdbc *dv;
        struct fw_pkt *pkt;
        int len, tlen, header, fd, frames, packets, vec, offset, nhdr, i;
        int system=-1, pad_acc, cycle_acc, cycle, f_frac;
        struct iovec wbuf[TNBUF*2 + NEMPTY];
        char *pbuf;
        u_int32_t iso_data, iso_empty, hdr[TNBUF + NEMPTY][3];
        struct ciphdr *ciph;
        struct timeval start, end;
        double rtime;

        fd = open(filename, O_RDONLY);
        if (fd == -1)
                err(EX_NOINPUT, "%s", filename);

        pbuf = malloc(DSIZE * TNBUF);
        bzero(wbuf, sizeof(wbuf));

        bufreq.rx.nchunk = 0;
        bufreq.rx.npacket = 0;
        bufreq.rx.psize = 0;
        bufreq.tx.nchunk = NCHUNK;
        bufreq.tx.npacket = NPACKET_T;
        bufreq.tx.psize = PSIZE;
        if (ioctl(d, FW_SSTBUF, &bufreq) < 0)
                err(1, "ioctl FW_SSTBUF");

        isoreq.ch = ich & 0x3f;
        isoreq.tag = (ich >> 6) & 3;

        if (ioctl(d, FW_STSTREAM, &isoreq) < 0)
                err(1, "ioctl FW_STSTREAM");

        iso_data = 0;
        pkt = (struct fw_pkt *) &iso_data;
        pkt->mode.stream.len = DSIZE + sizeof(struct ciphdr);
        pkt->mode.stream.sy = 0;
        pkt->mode.stream.tcode = FWTCODE_STREAM;
        pkt->mode.stream.chtag = ich;
        iso_empty = iso_data;
        pkt = (struct fw_pkt *) &iso_empty;
        pkt->mode.stream.len = sizeof(struct ciphdr);

        bzero(hdr[0], sizeof(hdr[0]));
        hdr[0][0] = iso_data;
        ciph = (struct ciphdr *)&hdr[0][1];
        ciph->src = 0;   /* XXX */
        ciph->len = 120;
        ciph->dbc = 0;
        ciph->eoh1 = 1;
        ciph->fdf.dv.cyc = 0xffff;

        for (i = 1; i < TNBUF; i++)
                bcopy(hdr[0], hdr[i], sizeof(hdr[0]));

        gettimeofday(&start, NULL);
#if DEBUG
        fprintf(stderr, "%08x %08x %08x\n",
                        htonl(hdr[0]), htonl(hdr[1]), htonl(hdr[2]));
#endif
        frames = 0;
        packets = 0;
        pad_acc = 0;
        while (1) {
                tlen = 0;
                while (tlen < DSIZE * TNBUF) {
                        len = read(fd, pbuf + tlen, DSIZE * TNBUF - tlen);
                        if (len <= 0) {
                                if (tlen > 0)
                                        break;
                                if (len < 0)
                                        warn("read");
                                else
                                        fprintf(stderr, "\nend of file\n");
                                goto send_end;
                        }
                        tlen += len;
                }
                vec = 0;
                offset = 0;
                nhdr = 0;
next:
                dv = (struct dvdbc *)(pbuf + offset * DSIZE);
#if 0
                header = (dv->sct == 0 && dv->dseq == 0);
#else
                header = (packets == 0 || packets % npackets[system] == 0);
#endif

                ciph = (struct ciphdr *)&hdr[nhdr][1];
                if (header) {
                        if (system < 0) {
                                system = ((dv->payload[0] & DV_DSF_12) != 0);
                                printf("%s\n", system_name[system]);
                                cycle = 1;
                                cycle_acc = frame_cycle[system].d * cycle;
                        }
                        fprintf(stderr, "%d", frames % 10);
                        frames ++;
                        if (count > 0 && frames > count)
                                break;
                        if (frames % frame_rate[system] == 0)
                                fprintf(stderr, "\n");
                        fflush(stderr);
                        f_frac = (cycle_acc % frame_cycle[system].d
                                        * CYCLE_FRAC) / frame_cycle[system].d;
#if 0
                        int f_cycle;
                        f_cycle = (cycle_acc / frame_cycle[system].d) & 0xf;
                        ciph->fdf.dv.cyc = htons(f_cycle << 12 | f_frac);
#else
                        ciph->fdf.dv.cyc = htons(cycle << 12 | f_frac);
#endif
                        cycle_acc += frame_cycle[system].n;
                        cycle_acc %= frame_cycle[system].d * 0x10;

                } else {
                        ciph->fdf.dv.cyc = 0xffff;
                }
                ciph->dbc = packets++ % 256;
                pad_acc += pad_rate[system].n;
                if (pad_acc >= pad_rate[system].d) {
                        pad_acc -= pad_rate[system].d;
                        bcopy(hdr[nhdr], hdr[nhdr+1], sizeof(hdr[0]));
                        hdr[nhdr][0] = iso_empty;
                        wbuf[vec].iov_base = (char *)hdr[nhdr];
                        wbuf[vec++].iov_len = sizeof(hdr[0]);
                        nhdr ++;
                        cycle ++;
                }
                hdr[nhdr][0] = iso_data;
                wbuf[vec].iov_base = (char *)hdr[nhdr];
                wbuf[vec++].iov_len = sizeof(hdr[0]);
                wbuf[vec].iov_base = (char *)dv;
                wbuf[vec++].iov_len = DSIZE;
                nhdr ++;
                cycle ++;
                offset ++;
                if (offset * DSIZE < tlen)
                        goto next;

again:
                len = writev(d, wbuf, vec);
                if (len < 0) {
                        if (errno == EAGAIN) {
                                fprintf(stderr, "(EAGAIN) - push 'Play'?\n");
                                goto again;
                        }
                        err(1, "write failed");
                }
        }
        fprintf(stderr, "\n");
send_end:
        gettimeofday(&end, NULL);
        rtime = end.tv_sec - start.tv_sec
                        + (end.tv_usec - start.tv_usec) * 1e-6;
        fprintf(stderr, "%d frames, %.2f secs, %.2f frames/sec\n",
                        frames, rtime, frames/rtime);
        close(fd);
}