1/*
2 * *BSD video grab interface
3 * Copyright (c) 2002 Steve O'Hara-Smith
4 * based on
5 *           Linux video grab interface
6 *           Copyright (c) 2000,2001 Gerard Lantau
7 * and
8 *           simple_grab.c Copyright (c) 1999 Roger Hardiman
9 *
10 * This file is part of Libav.
11 *
12 * Libav is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
16 *
17 * Libav is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
20 * Lesser General Public License for more details.
21 *
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with Libav; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 */
26
27#include "libavformat/avformat.h"
28#include "libavformat/internal.h"
29#include "libavutil/log.h"
30#include "libavutil/opt.h"
31#include "libavutil/parseutils.h"
32#if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H
33# include <dev/bktr/ioctl_meteor.h>
34# include <dev/bktr/ioctl_bt848.h>
35#elif HAVE_MACHINE_IOCTL_METEOR_H && HAVE_MACHINE_IOCTL_BT848_H
36# include <machine/ioctl_meteor.h>
37# include <machine/ioctl_bt848.h>
38#elif HAVE_DEV_VIDEO_METEOR_IOCTL_METEOR_H && HAVE_DEV_VIDEO_BKTR_IOCTL_BT848_H
39# include <dev/video/meteor/ioctl_meteor.h>
40# include <dev/video/bktr/ioctl_bt848.h>
41#elif HAVE_DEV_IC_BT8XX_H
42# include <dev/ic/bt8xx.h>
43#endif
44#include <unistd.h>
45#include <fcntl.h>
46#include <sys/ioctl.h>
47#include <sys/mman.h>
48#include <sys/time.h>
49#include <signal.h>
50#include <stdint.h>
51
52typedef struct {
53    AVClass *class;
54    int video_fd;
55    int tuner_fd;
56    int width, height;
57    uint64_t per_frame;
58    int standard;
59    char *video_size; /**< String describing video size, set by a private option. */
60    char *framerate;  /**< Set by a private option. */
61} VideoData;
62
63
64#define PAL 1
65#define PALBDGHI 1
66#define NTSC 2
67#define NTSCM 2
68#define SECAM 3
69#define PALN 4
70#define PALM 5
71#define NTSCJ 6
72
73/* PAL is 768 x 576. NTSC is 640 x 480 */
74#define PAL_HEIGHT 576
75#define SECAM_HEIGHT 576
76#define NTSC_HEIGHT 480
77
78#ifndef VIDEO_FORMAT
79#define VIDEO_FORMAT NTSC
80#endif
81
82static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
83    METEOR_DEV3, METEOR_DEV_SVIDEO };
84
85uint8_t *video_buf;
86size_t video_buf_size;
87uint64_t last_frame_time;
88volatile sig_atomic_t nsignals;
89
90
91static void catchsignal(int signal)
92{
93    nsignals++;
94    return;
95}
96
97static av_cold int bktr_init(const char *video_device, int width, int height,
98    int format, int *video_fd, int *tuner_fd, int idev, double frequency)
99{
100    struct meteor_geomet geo;
101    int h_max;
102    long ioctl_frequency;
103    char *arg;
104    int c;
105    struct sigaction act, old;
106
107    if (idev < 0 || idev > 4)
108    {
109        arg = getenv ("BKTR_DEV");
110        if (arg)
111            idev = atoi (arg);
112        if (idev < 0 || idev > 4)
113            idev = 1;
114    }
115
116    if (format < 1 || format > 6)
117    {
118        arg = getenv ("BKTR_FORMAT");
119        if (arg)
120            format = atoi (arg);
121        if (format < 1 || format > 6)
122            format = VIDEO_FORMAT;
123    }
124
125    if (frequency <= 0)
126    {
127        arg = getenv ("BKTR_FREQUENCY");
128        if (arg)
129            frequency = atof (arg);
130        if (frequency <= 0)
131            frequency = 0.0;
132    }
133
134    memset(&act, 0, sizeof(act));
135    sigemptyset(&act.sa_mask);
136    act.sa_handler = catchsignal;
137    sigaction(SIGUSR1, &act, &old);
138
139    *tuner_fd = open("/dev/tuner0", O_RDONLY);
140    if (*tuner_fd < 0)
141        av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
142
143    *video_fd = open(video_device, O_RDONLY);
144    if (*video_fd < 0) {
145        av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));
146        return -1;
147    }
148
149    geo.rows = height;
150    geo.columns = width;
151    geo.frames = 1;
152    geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
153
154    switch (format) {
155    case PAL:   h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
156    case PALN:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALN;     break;
157    case PALM:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALM;     break;
158    case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM;    break;
159    case NTSC:  h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCM;    break;
160    case NTSCJ: h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCJ;    break;
161    default:    h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
162    }
163
164    if (height <= h_max / 2)
165        geo.oformat |= METEOR_GEO_EVEN_ONLY;
166
167    if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
168        av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));
169        return -1;
170    }
171
172    if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
173        av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));
174        return -1;
175    }
176
177    c = bktr_dev[idev];
178    if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
179        av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));
180        return -1;
181    }
182
183    video_buf_size = width * height * 12 / 8;
184
185    video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
186        PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
187    if (video_buf == MAP_FAILED) {
188        av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
189        return -1;
190    }
191
192    if (frequency != 0.0) {
193        ioctl_frequency  = (unsigned long)(frequency*16);
194        if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
195            av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
196    }
197
198    c = AUDIO_UNMUTE;
199    if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
200        av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
201
202    c = METEOR_CAP_CONTINOUS;
203    ioctl(*video_fd, METEORCAPTUR, &c);
204
205    c = SIGUSR1;
206    ioctl(*video_fd, METEORSSIGNAL, &c);
207
208    return 0;
209}
210
211static void bktr_getframe(uint64_t per_frame)
212{
213    uint64_t curtime;
214
215    curtime = av_gettime();
216    if (!last_frame_time
217        || ((last_frame_time + per_frame) > curtime)) {
218        if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
219            if (!nsignals)
220                av_log(NULL, AV_LOG_INFO,
221                       "SLEPT NO signals - %d microseconds late\n",
222                       (int)(av_gettime() - last_frame_time - per_frame));
223        }
224    }
225    nsignals = 0;
226    last_frame_time = curtime;
227}
228
229
230/* note: we support only one picture read at a time */
231static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
232{
233    VideoData *s = s1->priv_data;
234
235    if (av_new_packet(pkt, video_buf_size) < 0)
236        return AVERROR(EIO);
237
238    bktr_getframe(s->per_frame);
239
240    pkt->pts = av_gettime();
241    memcpy(pkt->data, video_buf, video_buf_size);
242
243    return video_buf_size;
244}
245
246static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
247{
248    VideoData *s = s1->priv_data;
249    AVStream *st;
250    int width, height;
251    AVRational framerate;
252    int ret = 0;
253
254    if ((ret = av_parse_video_size(&width, &height, s->video_size)) < 0) {
255        av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n", s->video_size);
256        goto out;
257    }
258
259    if (!s->framerate)
260        switch (s->standard) {
261        case PAL:   s->framerate = av_strdup("pal");  break;
262        case NTSC:  s->framerate = av_strdup("ntsc"); break;
263        case SECAM: s->framerate = av_strdup("25");   break;
264        default:
265            av_log(s1, AV_LOG_ERROR, "Unknown standard.\n");
266            ret = AVERROR(EINVAL);
267            goto out;
268        }
269    if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
270        av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
271        goto out;
272    }
273
274    st = avformat_new_stream(s1, NULL);
275    if (!st) {
276        ret = AVERROR(ENOMEM);
277        goto out;
278    }
279    avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
280
281    s->width = width;
282    s->height = height;
283    s->per_frame = ((uint64_t)1000000 * framerate.den) / framerate.num;
284
285    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
286    st->codec->pix_fmt = PIX_FMT_YUV420P;
287    st->codec->codec_id = CODEC_ID_RAWVIDEO;
288    st->codec->width = width;
289    st->codec->height = height;
290    st->codec->time_base.den = framerate.num;
291    st->codec->time_base.num = framerate.den;
292
293
294    if (bktr_init(s1->filename, width, height, s->standard,
295                  &s->video_fd, &s->tuner_fd, -1, 0.0) < 0) {
296        ret = AVERROR(EIO);
297        goto out;
298    }
299
300    nsignals = 0;
301    last_frame_time = 0;
302
303out:
304    return ret;
305}
306
307static int grab_read_close(AVFormatContext *s1)
308{
309    VideoData *s = s1->priv_data;
310    int c;
311
312    c = METEOR_CAP_STOP_CONT;
313    ioctl(s->video_fd, METEORCAPTUR, &c);
314    close(s->video_fd);
315
316    c = AUDIO_MUTE;
317    ioctl(s->tuner_fd, BT848_SAUDIO, &c);
318    close(s->tuner_fd);
319
320    munmap((caddr_t)video_buf, video_buf_size);
321
322    return 0;
323}
324
325#define OFFSET(x) offsetof(VideoData, x)
326#define DEC AV_OPT_FLAG_DECODING_PARAM
327static const AVOption options[] = {
328    { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.dbl = VIDEO_FORMAT}, PAL, NTSCJ, AV_OPT_FLAG_DECODING_PARAM, "standard" },
329    { "PAL",      "", 0, AV_OPT_TYPE_CONST, {.dbl = PAL},   0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
330    { "NTSC",     "", 0, AV_OPT_TYPE_CONST, {.dbl = NTSC},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
331    { "SECAM",    "", 0, AV_OPT_TYPE_CONST, {.dbl = SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
332    { "PALN",     "", 0, AV_OPT_TYPE_CONST, {.dbl = PALN},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
333    { "PALM",     "", 0, AV_OPT_TYPE_CONST, {.dbl = PALM},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
334    { "NTSCJ",    "", 0, AV_OPT_TYPE_CONST, {.dbl = NTSCJ}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
335    { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = "vga"}, 0, 0, DEC },
336    { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
337    { NULL },
338};
339
340static const AVClass bktr_class = {
341    .class_name = "BKTR grab interface",
342    .item_name  = av_default_item_name,
343    .option     = options,
344    .version    = LIBAVUTIL_VERSION_INT,
345};
346
347AVInputFormat ff_bktr_demuxer = {
348    .name           = "bktr",
349    .long_name      = NULL_IF_CONFIG_SMALL("video grab"),
350    .priv_data_size = sizeof(VideoData),
351    .read_header    = grab_read_header,
352    .read_packet    = grab_read_packet,
353    .read_close     = grab_read_close,
354    .flags          = AVFMT_NOFILE,
355    .priv_class     = &bktr_class,
356};
357