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ffmpeg / libavdevice / bktr.c @ 4f4e4008

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/*
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 * *BSD video grab interface
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 * Copyright (c) 2002 Steve O'Hara-Smith
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 * based on
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 *           Linux video grab interface
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 *           Copyright (c) 2000,2001 Gerard Lantau
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 * and
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 *           simple_grab.c Copyright (c) 1999 Roger Hardiman
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#define _BSD_SOURCE 1
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#include "libavformat/avformat.h"
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#if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H
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# include <dev/bktr/ioctl_meteor.h>
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# include <dev/bktr/ioctl_bt848.h>
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#elif HAVE_MACHINE_IOCTL_METEOR_H && HAVE_MACHINE_IOCTL_BT848_H
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# include <machine/ioctl_meteor.h>
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# include <machine/ioctl_bt848.h>
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#elif HAVE_DEV_VIDEO_METEOR_IOCTL_METEOR_H && HAVE_DEV_VIDEO_BKTR_IOCTL_BT848_H
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# include <dev/video/meteor/ioctl_meteor.h>
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# include <dev/video/bktr/ioctl_bt848.h>
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#elif HAVE_DEV_IC_BT8XX_H
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# include <dev/ic/bt8xx.h>
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#endif
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include <signal.h>
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#include <stdint.h>
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#include <strings.h>
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typedef struct {
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    int video_fd;
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    int tuner_fd;
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    int width, height;
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    int frame_rate;
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    int frame_rate_base;
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    uint64_t per_frame;
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} VideoData;
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#define PAL 1
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#define PALBDGHI 1
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#define NTSC 2
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#define NTSCM 2
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#define SECAM 3
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#define PALN 4
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#define PALM 5
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#define NTSCJ 6
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/* PAL is 768 x 576. NTSC is 640 x 480 */
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#define PAL_HEIGHT 576
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#define SECAM_HEIGHT 576
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#define NTSC_HEIGHT 480
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#ifndef VIDEO_FORMAT
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#define VIDEO_FORMAT NTSC
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#endif
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static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
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    METEOR_DEV3, METEOR_DEV_SVIDEO };
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uint8_t *video_buf;
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size_t video_buf_size;
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uint64_t last_frame_time;
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volatile sig_atomic_t nsignals;
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static void catchsignal(int signal)
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{
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    nsignals++;
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    return;
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}
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static av_cold int bktr_init(const char *video_device, int width, int height,
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    int format, int *video_fd, int *tuner_fd, int idev, double frequency)
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{
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    struct meteor_geomet geo;
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    int h_max;
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    long ioctl_frequency;
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    char *arg;
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    int c;
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    struct sigaction act, old;
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    if (idev < 0 || idev > 4)
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    {
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        arg = getenv ("BKTR_DEV");
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        if (arg)
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            idev = atoi (arg);
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        if (idev < 0 || idev > 4)
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            idev = 1;
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    }
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    if (format < 1 || format > 6)
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    {
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        arg = getenv ("BKTR_FORMAT");
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        if (arg)
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            format = atoi (arg);
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        if (format < 1 || format > 6)
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            format = VIDEO_FORMAT;
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    }
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    if (frequency <= 0)
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    {
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        arg = getenv ("BKTR_FREQUENCY");
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        if (arg)
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            frequency = atof (arg);
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        if (frequency <= 0)
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            frequency = 0.0;
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    }
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    memset(&act, 0, sizeof(act));
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    sigemptyset(&act.sa_mask);
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    act.sa_handler = catchsignal;
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    sigaction(SIGUSR1, &act, &old);
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    *tuner_fd = open("/dev/tuner0", O_RDONLY);
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    if (*tuner_fd < 0)
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        av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
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    *video_fd = open(video_device, O_RDONLY);
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    if (*video_fd < 0) {
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        av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));
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        return -1;
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    }
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    geo.rows = height;
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    geo.columns = width;
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    geo.frames = 1;
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    geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
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    switch (format) {
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    case PAL:   h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
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    case PALN:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALN;     break;
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    case PALM:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALM;     break;
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    case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM;    break;
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    case NTSC:  h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCM;    break;
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    case NTSCJ: h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCJ;    break;
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    default:    h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
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    }
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    if (height <= h_max / 2)
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        geo.oformat |= METEOR_GEO_EVEN_ONLY;
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    if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
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        av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));
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        return -1;
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    }
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    if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
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        av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));
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        return -1;
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    }
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    c = bktr_dev[idev];
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    if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
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        av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));
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        return -1;
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    }
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    video_buf_size = width * height * 12 / 8;
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    video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
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        PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
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    if (video_buf == MAP_FAILED) {
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        av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
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        return -1;
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    }
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    if (frequency != 0.0) {
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        ioctl_frequency  = (unsigned long)(frequency*16);
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        if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
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            av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
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    }
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    c = AUDIO_UNMUTE;
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    if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
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        av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
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    c = METEOR_CAP_CONTINOUS;
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    ioctl(*video_fd, METEORCAPTUR, &c);
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    c = SIGUSR1;
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    ioctl(*video_fd, METEORSSIGNAL, &c);
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    return 0;
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}
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static void bktr_getframe(uint64_t per_frame)
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{
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    uint64_t curtime;
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    curtime = av_gettime();
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    if (!last_frame_time
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        || ((last_frame_time + per_frame) > curtime)) {
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        if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
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            if (!nsignals)
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                av_log(NULL, AV_LOG_INFO,
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                       "SLEPT NO signals - %d microseconds late\n",
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                       (int)(av_gettime() - last_frame_time - per_frame));
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        }
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    }
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    nsignals = 0;
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    last_frame_time = curtime;
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}
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/* note: we support only one picture read at a time */
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static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
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{
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    VideoData *s = s1->priv_data;
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    if (av_new_packet(pkt, video_buf_size) < 0)
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        return AVERROR(EIO);
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    bktr_getframe(s->per_frame);
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    pkt->pts = av_gettime();
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    memcpy(pkt->data, video_buf, video_buf_size);
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    return video_buf_size;
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}
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static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
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{
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    VideoData *s = s1->priv_data;
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    AVStream *st;
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    int width, height;
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    int frame_rate;
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    int frame_rate_base;
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    int format = -1;
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    if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0)
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        return -1;
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    width = ap->width;
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    height = ap->height;
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    frame_rate = ap->time_base.den;
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    frame_rate_base = ap->time_base.num;
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    st = av_new_stream(s1, 0);
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    if (!st)
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        return AVERROR(ENOMEM);
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    av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
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    s->width = width;
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    s->height = height;
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    s->frame_rate = frame_rate;
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    s->frame_rate_base = frame_rate_base;
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    s->per_frame = ((uint64_t)1000000 * s->frame_rate_base) / s->frame_rate;
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    st->codec->codec_type = CODEC_TYPE_VIDEO;
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    st->codec->pix_fmt = PIX_FMT_YUV420P;
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    st->codec->codec_id = CODEC_ID_RAWVIDEO;
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    st->codec->width = width;
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    st->codec->height = height;
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    st->codec->time_base.den = frame_rate;
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    st->codec->time_base.num = frame_rate_base;
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    if (ap->standard) {
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        if (!strcasecmp(ap->standard, "pal"))
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            format = PAL;
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        else if (!strcasecmp(ap->standard, "secam"))
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            format = SECAM;
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        else if (!strcasecmp(ap->standard, "ntsc"))
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            format = NTSC;
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    }
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    if (bktr_init(s1->filename, width, height, format,
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            &(s->video_fd), &(s->tuner_fd), -1, 0.0) < 0)
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        return AVERROR(EIO);
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    nsignals = 0;
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    last_frame_time = 0;
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    return 0;
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}
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static int grab_read_close(AVFormatContext *s1)
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{
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    VideoData *s = s1->priv_data;
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    int c;
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    c = METEOR_CAP_STOP_CONT;
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    ioctl(s->video_fd, METEORCAPTUR, &c);
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    close(s->video_fd);
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    c = AUDIO_MUTE;
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    ioctl(s->tuner_fd, BT848_SAUDIO, &c);
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    close(s->tuner_fd);
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    munmap((caddr_t)video_buf, video_buf_size);
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    return 0;
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}
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AVInputFormat bktr_demuxer = {
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    "bktr",
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    NULL_IF_CONFIG_SMALL("video grab"),
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    sizeof(VideoData),
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    NULL,
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    grab_read_header,
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    grab_read_packet,
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    grab_read_close,
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    .flags = AVFMT_NOFILE,
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};