summaryrefslogtreecommitdiff
path: root/libavdevice/bktr.c
blob: d5f3d9f3307734306d8bcfe62382309b076db171 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
/*
 * *BSD video grab interface
 * Copyright (c) 2002 Steve O'Hara-Smith
 * based on
 *           Linux video grab interface
 *           Copyright (c) 2000,2001 Gerard Lantau
 * and
 *           simple_grab.c Copyright (c) 1999 Roger Hardiman
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavformat/internal.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H
# include <dev/bktr/ioctl_meteor.h>
# include <dev/bktr/ioctl_bt848.h>
#elif HAVE_MACHINE_IOCTL_METEOR_H && HAVE_MACHINE_IOCTL_BT848_H
# include <machine/ioctl_meteor.h>
# include <machine/ioctl_bt848.h>
#elif HAVE_DEV_VIDEO_METEOR_IOCTL_METEOR_H && HAVE_DEV_VIDEO_BKTR_IOCTL_BT848_H
# include <dev/video/meteor/ioctl_meteor.h>
# include <dev/video/bktr/ioctl_bt848.h>
#elif HAVE_DEV_IC_BT8XX_H
# include <dev/ic/bt8xx.h>
#endif
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <signal.h>
#include <stdint.h>
#include "avdevice.h"

typedef struct {
    AVClass *class;
    int video_fd;
    int tuner_fd;
    int width, height;
    uint64_t per_frame;
    int standard;
    char *framerate;  /**< Set by a private option. */
} VideoData;


#define PAL 1
#define PALBDGHI 1
#define NTSC 2
#define NTSCM 2
#define SECAM 3
#define PALN 4
#define PALM 5
#define NTSCJ 6

/* PAL is 768 x 576. NTSC is 640 x 480 */
#define PAL_HEIGHT 576
#define SECAM_HEIGHT 576
#define NTSC_HEIGHT 480

#ifndef VIDEO_FORMAT
#define VIDEO_FORMAT NTSC
#endif

static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
    METEOR_DEV3, METEOR_DEV_SVIDEO };

uint8_t *video_buf;
size_t video_buf_size;
uint64_t last_frame_time;
volatile sig_atomic_t nsignals;


static void catchsignal(int signal)
{
    nsignals++;
    return;
}

static av_cold int bktr_init(const char *video_device, int width, int height,
    int format, int *video_fd, int *tuner_fd, int idev, double frequency)
{
    struct meteor_geomet geo;
    int h_max;
    long ioctl_frequency;
    char *arg;
    int c;
    struct sigaction act = { {0} }, old;

    if (idev < 0 || idev > 4)
    {
        arg = getenv ("BKTR_DEV");
        if (arg)
            idev = atoi (arg);
        if (idev < 0 || idev > 4)
            idev = 1;
    }

    if (format < 1 || format > 6)
    {
        arg = getenv ("BKTR_FORMAT");
        if (arg)
            format = atoi (arg);
        if (format < 1 || format > 6)
            format = VIDEO_FORMAT;
    }

    if (frequency <= 0)
    {
        arg = getenv ("BKTR_FREQUENCY");
        if (arg)
            frequency = atof (arg);
        if (frequency <= 0)
            frequency = 0.0;
    }

    sigemptyset(&act.sa_mask);
    act.sa_handler = catchsignal;
    sigaction(SIGUSR1, &act, &old);

    *tuner_fd = open("/dev/tuner0", O_RDONLY);
    if (*tuner_fd < 0)
        av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));

    *video_fd = open(video_device, O_RDONLY);
    if (*video_fd < 0) {
        av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));
        return -1;
    }

    geo.rows = height;
    geo.columns = width;
    geo.frames = 1;
    geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;

    switch (format) {
    case PAL:   h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
    case PALN:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALN;     break;
    case PALM:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALM;     break;
    case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM;    break;
    case NTSC:  h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCM;    break;
    case NTSCJ: h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCJ;    break;
    default:    h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
    }

    if (height <= h_max / 2)
        geo.oformat |= METEOR_GEO_EVEN_ONLY;

    if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
        av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));
        return -1;
    }

    if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
        av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));
        return -1;
    }

    c = bktr_dev[idev];
    if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
        av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));
        return -1;
    }

    video_buf_size = width * height * 12 / 8;

    video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
        PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
    if (video_buf == MAP_FAILED) {
        av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
        return -1;
    }

    if (frequency != 0.0) {
        ioctl_frequency  = (unsigned long)(frequency*16);
        if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
            av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
    }

    c = AUDIO_UNMUTE;
    if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
        av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));

    c = METEOR_CAP_CONTINOUS;
    ioctl(*video_fd, METEORCAPTUR, &c);

    c = SIGUSR1;
    ioctl(*video_fd, METEORSSIGNAL, &c);

    return 0;
}

static void bktr_getframe(uint64_t per_frame)
{
    uint64_t curtime;

    curtime = av_gettime();
    if (!last_frame_time
        || ((last_frame_time + per_frame) > curtime)) {
        if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
            if (!nsignals)
                av_log(NULL, AV_LOG_INFO,
                       "SLEPT NO signals - %d microseconds late\n",
                       (int)(av_gettime() - last_frame_time - per_frame));
        }
    }
    nsignals = 0;
    last_frame_time = curtime;
}


/* note: we support only one picture read at a time */
static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
{
    VideoData *s = s1->priv_data;

    if (av_new_packet(pkt, video_buf_size) < 0)
        return AVERROR(EIO);

    bktr_getframe(s->per_frame);

    pkt->pts = av_gettime();
    memcpy(pkt->data, video_buf, video_buf_size);

    return video_buf_size;
}

static int grab_read_header(AVFormatContext *s1)
{
    VideoData *s = s1->priv_data;
    AVStream *st;
    AVRational framerate;
    int ret = 0;

    if (!s->framerate)
        switch (s->standard) {
        case PAL:   s->framerate = av_strdup("pal");  break;
        case NTSC:  s->framerate = av_strdup("ntsc"); break;
        case SECAM: s->framerate = av_strdup("25");   break;
        default:
            av_log(s1, AV_LOG_ERROR, "Unknown standard.\n");
            ret = AVERROR(EINVAL);
            goto out;
        }
    if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
        av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
        goto out;
    }

    st = avformat_new_stream(s1, NULL);
    if (!st) {
        ret = AVERROR(ENOMEM);
        goto out;
    }
    avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */

    s->per_frame = ((uint64_t)1000000 * framerate.den) / framerate.num;

    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
    st->codec->pix_fmt = AV_PIX_FMT_YUV420P;
    st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
    st->codec->width = s->width;
    st->codec->height = s->height;
    st->codec->time_base.den = framerate.num;
    st->codec->time_base.num = framerate.den;


    if (bktr_init(s1->filename, s->width, s->height, s->standard,
                  &s->video_fd, &s->tuner_fd, -1, 0.0) < 0) {
        ret = AVERROR(EIO);
        goto out;
    }

    nsignals = 0;
    last_frame_time = 0;

out:
    return ret;
}

static int grab_read_close(AVFormatContext *s1)
{
    VideoData *s = s1->priv_data;
    int c;

    c = METEOR_CAP_STOP_CONT;
    ioctl(s->video_fd, METEORCAPTUR, &c);
    close(s->video_fd);

    c = AUDIO_MUTE;
    ioctl(s->tuner_fd, BT848_SAUDIO, &c);
    close(s->tuner_fd);

    munmap((caddr_t)video_buf, video_buf_size);

    return 0;
}

#define OFFSET(x) offsetof(VideoData, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
    { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.i64 = VIDEO_FORMAT}, PAL, NTSCJ, AV_OPT_FLAG_DECODING_PARAM, "standard" },
    { "PAL",      "", 0, AV_OPT_TYPE_CONST, {.i64 = PAL},   0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
    { "NTSC",     "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSC},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
    { "SECAM",    "", 0, AV_OPT_TYPE_CONST, {.i64 = SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
    { "PALN",     "", 0, AV_OPT_TYPE_CONST, {.i64 = PALN},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
    { "PALM",     "", 0, AV_OPT_TYPE_CONST, {.i64 = PALM},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
    { "NTSCJ",    "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSCJ}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
    { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = "vga"}, 0, 0, DEC },
    { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
    { NULL },
};

static const AVClass bktr_class = {
    .class_name = "BKTR grab interface",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

AVInputFormat ff_bktr_demuxer = {
    .name           = "bktr",
    .long_name      = NULL_IF_CONFIG_SMALL("video grab"),
    .priv_data_size = sizeof(VideoData),
    .read_header    = grab_read_header,
    .read_packet    = grab_read_packet,
    .read_close     = grab_read_close,
    .flags          = AVFMT_NOFILE,
    .priv_class     = &bktr_class,
};