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ffmpeg / libavdevice / v4l2.c @ 9c5a9e6b

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1 0a7b514f Luca Abeni
/*
2
 * Video4Linux2 grab interface
3 406792e7 Diego Biurrun
 * Copyright (c) 2000,2001 Fabrice Bellard
4
 * Copyright (c) 2006 Luca Abeni
5 0a7b514f Luca Abeni
 *
6
 * Part of this file is based on the V4L2 video capture example
7
 * (http://v4l2spec.bytesex.org/v4l2spec/capture.c)
8
 *
9
 * Thanks to Michael Niedermayer for providing the mapping between
10
 * V4L2_PIX_FMT_* and PIX_FMT_*
11
 *
12
 *
13 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
14
 *
15
 * FFmpeg is free software; you can redistribute it and/or
16 0a7b514f Luca Abeni
 * modify it under the terms of the GNU Lesser General Public
17
 * License as published by the Free Software Foundation; either
18 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
19 0a7b514f Luca Abeni
 *
20 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
21 0a7b514f Luca Abeni
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
23
 * Lesser General Public License for more details.
24
 *
25
 * You should have received a copy of the GNU Lesser General Public
26 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
27 0a7b514f Luca Abeni
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28
 */
29 b0067549 Diego Biurrun
30 e9d4b8a5 Michael Niedermayer
#undef __STRICT_ANSI__ //workaround due to broken kernel headers
31 b0067549 Diego Biurrun
#include "config.h"
32 245976da Diego Biurrun
#include "libavformat/avformat.h"
33 0a7b514f Luca Abeni
#include <unistd.h>
34
#include <fcntl.h>
35
#include <sys/ioctl.h>
36
#include <sys/mman.h>
37
#include <sys/time.h>
38 b250f9c6 Aurelien Jacobs
#if HAVE_SYS_VIDEOIO_H
39 1b6e8b73 Brad
#include <sys/videoio.h>
40
#else
41 f743a062 Luca Abeni
#include <asm/types.h>
42
#include <linux/videodev2.h>
43 1b6e8b73 Brad
#endif
44 0a7b514f Luca Abeni
#include <time.h>
45 ea452b54 Aurelien Jacobs
#include <strings.h>
46 0a7b514f Luca Abeni
47
static const int desired_video_buffers = 256;
48
49
enum io_method {
50
    io_read,
51
    io_mmap,
52
    io_userptr
53
};
54
55
struct video_data {
56
    int fd;
57
    int frame_format; /* V4L2_PIX_FMT_* */
58
    enum io_method io_method;
59
    int width, height;
60
    int frame_size;
61
    int top_field_first;
62
63
    int buffers;
64
    void **buf_start;
65
    unsigned int *buf_len;
66
};
67
68 41536a60 Luca Abeni
struct buff_data {
69
    int index;
70
    int fd;
71
};
72
73 0a7b514f Luca Abeni
struct fmt_map {
74
    enum PixelFormat ff_fmt;
75
    int32_t v4l2_fmt;
76
};
77
78
static struct fmt_map fmt_conversion_table[] = {
79
    {
80
        .ff_fmt = PIX_FMT_YUV420P,
81
        .v4l2_fmt = V4L2_PIX_FMT_YUV420,
82
    },
83
    {
84
        .ff_fmt = PIX_FMT_YUV422P,
85
        .v4l2_fmt = V4L2_PIX_FMT_YUV422P,
86
    },
87
    {
88 71e445fc Diego Biurrun
        .ff_fmt = PIX_FMT_YUYV422,
89 0a7b514f Luca Abeni
        .v4l2_fmt = V4L2_PIX_FMT_YUYV,
90
    },
91
    {
92
        .ff_fmt = PIX_FMT_UYVY422,
93
        .v4l2_fmt = V4L2_PIX_FMT_UYVY,
94
    },
95
    {
96
        .ff_fmt = PIX_FMT_YUV411P,
97
        .v4l2_fmt = V4L2_PIX_FMT_YUV411P,
98
    },
99
    {
100
        .ff_fmt = PIX_FMT_YUV410P,
101
        .v4l2_fmt = V4L2_PIX_FMT_YUV410,
102
    },
103
    {
104 97a290ef Jean Delvare
        .ff_fmt = PIX_FMT_RGB555,
105
        .v4l2_fmt = V4L2_PIX_FMT_RGB555,
106
    },
107
    {
108
        .ff_fmt = PIX_FMT_RGB565,
109
        .v4l2_fmt = V4L2_PIX_FMT_RGB565,
110
    },
111
    {
112 0a7b514f Luca Abeni
        .ff_fmt = PIX_FMT_BGR24,
113
        .v4l2_fmt = V4L2_PIX_FMT_BGR24,
114
    },
115
    {
116
        .ff_fmt = PIX_FMT_RGB24,
117
        .v4l2_fmt = V4L2_PIX_FMT_RGB24,
118
    },
119
    {
120 92d04e76 Jean Delvare
        .ff_fmt = PIX_FMT_BGRA,
121 0a7b514f Luca Abeni
        .v4l2_fmt = V4L2_PIX_FMT_BGR32,
122
    },
123
    {
124
        .ff_fmt = PIX_FMT_GRAY8,
125
        .v4l2_fmt = V4L2_PIX_FMT_GREY,
126
    },
127
};
128
129 cc58300e Ramiro Polla
static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
130 0a7b514f Luca Abeni
{
131
    struct v4l2_capability cap;
132
    int fd;
133
    int res;
134 653387d8 Luca Abeni
    int flags = O_RDWR;
135 0a7b514f Luca Abeni
136 653387d8 Luca Abeni
    if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
137
        flags |= O_NONBLOCK;
138
    }
139
    fd = open(ctx->filename, flags, 0);
140 0a7b514f Luca Abeni
    if (fd < 0) {
141 c7238c72 Luca Abeni
        av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
142 cc58300e Ramiro Polla
                 ctx->filename, strerror(errno));
143 0a7b514f Luca Abeni
144
        return -1;
145
    }
146
147
    res = ioctl(fd, VIDIOC_QUERYCAP, &cap);
148 c16601bb Alex Beregszaszi
    // ENOIOCTLCMD definition only availble on __KERNEL__
149
    if (res < 0 && errno == 515)
150
    {
151 c7238c72 Luca Abeni
        av_log(ctx, AV_LOG_ERROR, "QUERYCAP not implemented, probably V4L device but not supporting V4L2\n");
152 2b63c222 Flavio Pimentel Duarte
        close(fd);
153 c16601bb Alex Beregszaszi
154
        return -1;
155
    }
156 0a7b514f Luca Abeni
    if (res < 0) {
157 c7238c72 Luca Abeni
        av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
158 0a7b514f Luca Abeni
                 strerror(errno));
159 2b63c222 Flavio Pimentel Duarte
        close(fd);
160 0a7b514f Luca Abeni
161
        return -1;
162
    }
163
    if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) {
164 c7238c72 Luca Abeni
        av_log(ctx, AV_LOG_ERROR, "Not a video capture device\n");
165 2b63c222 Flavio Pimentel Duarte
        close(fd);
166 0a7b514f Luca Abeni
167
        return -1;
168
    }
169
    *capabilities = cap.capabilities;
170
171
    return fd;
172
}
173
174 c7238c72 Luca Abeni
static int device_init(AVFormatContext *ctx, int *width, int *height, int pix_fmt)
175 0a7b514f Luca Abeni
{
176 c7238c72 Luca Abeni
    struct video_data *s = ctx->priv_data;
177
    int fd = s->fd;
178 0a7b514f Luca Abeni
    struct v4l2_format fmt;
179 24300af4 Luca Abeni
    int res;
180 0a7b514f Luca Abeni
181
    memset(&fmt, 0, sizeof(struct v4l2_format));
182
    fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
183 24300af4 Luca Abeni
    fmt.fmt.pix.width = *width;
184
    fmt.fmt.pix.height = *height;
185 0a7b514f Luca Abeni
    fmt.fmt.pix.pixelformat = pix_fmt;
186
    fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
187 24300af4 Luca Abeni
    res = ioctl(fd, VIDIOC_S_FMT, &fmt);
188
    if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
189 c7238c72 Luca Abeni
        av_log(ctx, AV_LOG_INFO, "The V4L2 driver changed the video from %dx%d to %dx%d\n", *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
190 24300af4 Luca Abeni
        *width = fmt.fmt.pix.width;
191
        *height = fmt.fmt.pix.height;
192
    }
193
194 3d0d9a5e Jens Rosenboom
    if (pix_fmt != fmt.fmt.pix.pixelformat) {
195
        av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver changed the pixel format from 0x%08X to 0x%08X\n", pix_fmt, fmt.fmt.pix.pixelformat);
196
        res = -1;
197
    }
198
199 24300af4 Luca Abeni
    return res;
200 0a7b514f Luca Abeni
}
201
202
static int first_field(int fd)
203
{
204
    int res;
205
    v4l2_std_id std;
206
207
    res = ioctl(fd, VIDIOC_G_STD, &std);
208
    if (res < 0) {
209
        return 0;
210
    }
211
    if (std & V4L2_STD_NTSC) {
212
        return 0;
213
    }
214
215
    return 1;
216
}
217
218
static uint32_t fmt_ff2v4l(enum PixelFormat pix_fmt)
219
{
220
    int i;
221
222 37d3e066 Aurelien Jacobs
    for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
223 0a7b514f Luca Abeni
        if (fmt_conversion_table[i].ff_fmt == pix_fmt) {
224
            return fmt_conversion_table[i].v4l2_fmt;
225
        }
226
    }
227
228
    return 0;
229
}
230
231
static enum PixelFormat fmt_v4l2ff(uint32_t pix_fmt)
232
{
233
    int i;
234
235 37d3e066 Aurelien Jacobs
    for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
236 0a7b514f Luca Abeni
        if (fmt_conversion_table[i].v4l2_fmt == pix_fmt) {
237
            return fmt_conversion_table[i].ff_fmt;
238
        }
239
    }
240
241 eacced45 Carl Eugen Hoyos
    return PIX_FMT_NONE;
242 0a7b514f Luca Abeni
}
243
244 c7238c72 Luca Abeni
static int mmap_init(AVFormatContext *ctx)
245 0a7b514f Luca Abeni
{
246 c7238c72 Luca Abeni
    struct video_data *s = ctx->priv_data;
247 0a7b514f Luca Abeni
    struct v4l2_requestbuffers req;
248
    int i, res;
249
250
    memset(&req, 0, sizeof(struct v4l2_requestbuffers));
251
    req.count = desired_video_buffers;
252
    req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
253
    req.memory = V4L2_MEMORY_MMAP;
254
    res = ioctl (s->fd, VIDIOC_REQBUFS, &req);
255
    if (res < 0) {
256
        if (errno == EINVAL) {
257 c7238c72 Luca Abeni
            av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n");
258 0a7b514f Luca Abeni
        } else {
259 c7238c72 Luca Abeni
            av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n");
260 0a7b514f Luca Abeni
        }
261
262
        return -1;
263
    }
264
265
    if (req.count < 2) {
266 c7238c72 Luca Abeni
        av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
267 0a7b514f Luca Abeni
268
        return -1;
269
    }
270
    s->buffers = req.count;
271
    s->buf_start = av_malloc(sizeof(void *) * s->buffers);
272
    if (s->buf_start == NULL) {
273 c7238c72 Luca Abeni
        av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
274 0a7b514f Luca Abeni
275
        return -1;
276
    }
277
    s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
278
    if (s->buf_len == NULL) {
279 c7238c72 Luca Abeni
        av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
280 0a7b514f Luca Abeni
        av_free(s->buf_start);
281
282
        return -1;
283
    }
284
285
    for (i = 0; i < req.count; i++) {
286
        struct v4l2_buffer buf;
287
288
        memset(&buf, 0, sizeof(struct v4l2_buffer));
289
        buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
290
        buf.memory = V4L2_MEMORY_MMAP;
291
        buf.index = i;
292
        res = ioctl (s->fd, VIDIOC_QUERYBUF, &buf);
293
        if (res < 0) {
294 c7238c72 Luca Abeni
            av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
295 0a7b514f Luca Abeni
296
            return -1;
297
        }
298
299
        s->buf_len[i] = buf.length;
300
        if (s->buf_len[i] < s->frame_size) {
301 c7238c72 Luca Abeni
            av_log(ctx, AV_LOG_ERROR, "Buffer len [%d] = %d != %d\n", i, s->buf_len[i], s->frame_size);
302 0a7b514f Luca Abeni
303
            return -1;
304
        }
305
        s->buf_start[i] = mmap (NULL, buf.length,
306
                        PROT_READ | PROT_WRITE, MAP_SHARED, s->fd, buf.m.offset);
307
        if (s->buf_start[i] == MAP_FAILED) {
308 c7238c72 Luca Abeni
            av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
309 0a7b514f Luca Abeni
310
            return -1;
311
        }
312
    }
313
314
    return 0;
315
}
316
317 c7238c72 Luca Abeni
static int read_init(AVFormatContext *ctx)
318 0a7b514f Luca Abeni
{
319
    return -1;
320
}
321
322 41536a60 Luca Abeni
static void mmap_release_buffer(AVPacket *pkt)
323
{
324
    struct v4l2_buffer buf;
325
    int res, fd;
326
    struct buff_data *buf_descriptor = pkt->priv;
327
328 5449a787 Luca Abeni
    if (pkt->data == NULL) {
329
         return;
330
    }
331
332 41536a60 Luca Abeni
    memset(&buf, 0, sizeof(struct v4l2_buffer));
333
    buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
334
    buf.memory = V4L2_MEMORY_MMAP;
335
    buf.index = buf_descriptor->index;
336
    fd = buf_descriptor->fd;
337
    av_free(buf_descriptor);
338
339
    res = ioctl (fd, VIDIOC_QBUF, &buf);
340
    if (res < 0) {
341
        av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n");
342
    }
343
    pkt->data = NULL;
344
    pkt->size = 0;
345
}
346
347
static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
348 0a7b514f Luca Abeni
{
349 c7238c72 Luca Abeni
    struct video_data *s = ctx->priv_data;
350 0a7b514f Luca Abeni
    struct v4l2_buffer buf;
351 41536a60 Luca Abeni
    struct buff_data *buf_descriptor;
352 0a7b514f Luca Abeni
    int res;
353
354
    memset(&buf, 0, sizeof(struct v4l2_buffer));
355
    buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
356
    buf.memory = V4L2_MEMORY_MMAP;
357
358
    /* FIXME: Some special treatment might be needed in case of loss of signal... */
359 653387d8 Luca Abeni
    while ((res = ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
360 0a7b514f Luca Abeni
    if (res < 0) {
361 653387d8 Luca Abeni
        if (errno == EAGAIN) {
362
            pkt->size = 0;
363
364
            return AVERROR(EAGAIN);
365
        }
366 c7238c72 Luca Abeni
        av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", strerror(errno));
367 0a7b514f Luca Abeni
368
        return -1;
369
    }
370
    assert (buf.index < s->buffers);
371 7c7e7464 Luca Abeni
    if (buf.bytesused != s->frame_size) {
372 c7238c72 Luca Abeni
        av_log(ctx, AV_LOG_ERROR, "The v4l2 frame is %d bytes, but %d bytes are expected\n", buf.bytesused, s->frame_size);
373 7c7e7464 Luca Abeni
374
        return -1;
375
    }
376
377 0a7b514f Luca Abeni
    /* Image is at s->buff_start[buf.index] */
378 41536a60 Luca Abeni
    pkt->data= s->buf_start[buf.index];
379
    pkt->size = buf.bytesused;
380
    pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
381
    pkt->destruct = mmap_release_buffer;
382
    buf_descriptor = av_malloc(sizeof(struct buff_data));
383
    if (buf_descriptor == NULL) {
384
        /* Something went wrong... Since av_malloc() failed, we cannot even
385
         * allocate a buffer for memcopying into it
386
         */
387
        av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
388
        res = ioctl (s->fd, VIDIOC_QBUF, &buf);
389 0a7b514f Luca Abeni
390
        return -1;
391
    }
392 41536a60 Luca Abeni
    buf_descriptor->fd = s->fd;
393
    buf_descriptor->index = buf.index;
394
    pkt->priv = buf_descriptor;
395 0a7b514f Luca Abeni
396
    return s->buf_len[buf.index];
397
}
398
399 41536a60 Luca Abeni
static int read_frame(AVFormatContext *ctx, AVPacket *pkt)
400 0a7b514f Luca Abeni
{
401
    return -1;
402
}
403
404 c7238c72 Luca Abeni
static int mmap_start(AVFormatContext *ctx)
405 0a7b514f Luca Abeni
{
406 c7238c72 Luca Abeni
    struct video_data *s = ctx->priv_data;
407 0a7b514f Luca Abeni
    enum v4l2_buf_type type;
408
    int i, res;
409
410
    for (i = 0; i < s->buffers; i++) {
411
        struct v4l2_buffer buf;
412
413
        memset(&buf, 0, sizeof(struct v4l2_buffer));
414
        buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
415
        buf.memory = V4L2_MEMORY_MMAP;
416
        buf.index  = i;
417
418
        res = ioctl (s->fd, VIDIOC_QBUF, &buf);
419
        if (res < 0) {
420 c7238c72 Luca Abeni
            av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno));
421 0a7b514f Luca Abeni
422
            return -1;
423
        }
424
    }
425
426
    type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
427
    res = ioctl (s->fd, VIDIOC_STREAMON, &type);
428
    if (res < 0) {
429 c7238c72 Luca Abeni
        av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", strerror(errno));
430 0a7b514f Luca Abeni
431
        return -1;
432
    }
433
434
    return 0;
435
}
436
437
static void mmap_close(struct video_data *s)
438
{
439
    enum v4l2_buf_type type;
440
    int i;
441
442
    type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
443
    /* We do not check for the result, because we could
444
     * not do anything about it anyway...
445
     */
446
    ioctl(s->fd, VIDIOC_STREAMOFF, &type);
447
    for (i = 0; i < s->buffers; i++) {
448
        munmap(s->buf_start[i], s->buf_len[i]);
449
    }
450
    av_free(s->buf_start);
451
    av_free(s->buf_len);
452
}
453
454 f5ad81f5 Limin Wang
static int v4l2_set_parameters( AVFormatContext *s1, AVFormatParameters *ap )
455
{
456
    struct video_data *s = s1->priv_data;
457
    struct v4l2_input input;
458
    struct v4l2_standard standard;
459
    int i;
460
461 0d6c0732 Limin Wang
    if(ap->channel>=0) {
462 e4dd03f3 Luca Abeni
        /* set tv video input */
463
        memset (&input, 0, sizeof (input));
464
        input.index = ap->channel;
465
        if(ioctl (s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
466
            av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n");
467 6f3e0b21 Panagiotis Issaris
            return AVERROR(EIO);
468 e4dd03f3 Luca Abeni
        }
469 f5ad81f5 Limin Wang
470 e4dd03f3 Luca Abeni
        av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n",
471
               ap->channel, input.name);
472
        if(ioctl (s->fd, VIDIOC_S_INPUT, &input.index) < 0 ) {
473
            av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set input(%d) failed\n",
474
                   ap->channel);
475 6f3e0b21 Panagiotis Issaris
            return AVERROR(EIO);
476 e4dd03f3 Luca Abeni
        }
477 0d6c0732 Limin Wang
    }
478 f5ad81f5 Limin Wang
479 0d6c0732 Limin Wang
    if(ap->standard) {
480 e4dd03f3 Luca Abeni
        av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
481
               ap->standard );
482
        /* set tv standard */
483
        memset (&standard, 0, sizeof (standard));
484
        for(i=0;;i++) {
485
            standard.index = i;
486
            if (ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
487
                av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
488
                       ap->standard);
489 6f3e0b21 Panagiotis Issaris
                return AVERROR(EIO);
490 e4dd03f3 Luca Abeni
            }
491
492
            if(!strcasecmp(standard.name, ap->standard)) {
493
                break;
494
            }
495
        }
496
497
        av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
498 1c787b10 Luca Abeni
               ap->standard, (uint64_t)standard.id);
499 e4dd03f3 Luca Abeni
        if (ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
500 f5ad81f5 Limin Wang
            av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
501
                   ap->standard);
502 6f3e0b21 Panagiotis Issaris
            return AVERROR(EIO);
503 f5ad81f5 Limin Wang
        }
504 0d6c0732 Limin Wang
    }
505 f5ad81f5 Limin Wang
506
    return 0;
507
}
508
509 0a7b514f Luca Abeni
static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
510
{
511
    struct video_data *s = s1->priv_data;
512
    AVStream *st;
513
    int width, height;
514 e7b987dc Luca Abeni
    int res;
515 0a7b514f Luca Abeni
    uint32_t desired_format, capabilities;
516
517 99423fa0 Stefano Sabatini
    if (ap->width <= 0 || ap->height <= 0) {
518
        av_log(s1, AV_LOG_ERROR, "Wrong size (%dx%d)\n", ap->width, ap->height);
519
        return -1;
520
    }
521 0a7b514f Luca Abeni
522
    width = ap->width;
523
    height = ap->height;
524
525 5d91e928 Stefano Sabatini
    if(avcodec_check_dimensions(s1, ap->width, ap->height) < 0)
526 0a7b514f Luca Abeni
        return -1;
527
528
    st = av_new_stream(s1, 0);
529
    if (!st) {
530 8fa36ae0 François Revol
        return AVERROR(ENOMEM);
531 0a7b514f Luca Abeni
    }
532
    av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
533
534
    s->width = width;
535
    s->height = height;
536
537
    capabilities = 0;
538 cc58300e Ramiro Polla
    s->fd = device_open(s1, &capabilities);
539 0a7b514f Luca Abeni
    if (s->fd < 0) {
540 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
541 0a7b514f Luca Abeni
    }
542 60023e32 Luca Abeni
    av_log(s1, AV_LOG_INFO, "[%d]Capabilities: %x\n", s->fd, capabilities);
543 0a7b514f Luca Abeni
544
    desired_format = fmt_ff2v4l(ap->pix_fmt);
545 c7238c72 Luca Abeni
    if (desired_format == 0 || (device_init(s1, &width, &height, desired_format) < 0)) {
546 0a7b514f Luca Abeni
        int i, done;
547
548
        done = 0; i = 0;
549
        while (!done) {
550
            desired_format = fmt_conversion_table[i].v4l2_fmt;
551 c7238c72 Luca Abeni
            if (device_init(s1, &width, &height, desired_format) < 0) {
552 0a7b514f Luca Abeni
                desired_format = 0;
553
                i++;
554
            } else {
555
               done = 1;
556
            }
557 37d3e066 Aurelien Jacobs
            if (i == FF_ARRAY_ELEMS(fmt_conversion_table)) {
558 0a7b514f Luca Abeni
               done = 1;
559
            }
560
        }
561
    }
562
    if (desired_format == 0) {
563
        av_log(s1, AV_LOG_ERROR, "Cannot find a proper format.\n");
564
        close(s->fd);
565
566 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
567 0a7b514f Luca Abeni
    }
568
    s->frame_format = desired_format;
569
570 f5ad81f5 Limin Wang
    if( v4l2_set_parameters( s1, ap ) < 0 )
571 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
572 f5ad81f5 Limin Wang
573 0a7b514f Luca Abeni
    st->codec->pix_fmt = fmt_v4l2ff(desired_format);
574
    s->frame_size = avpicture_get_size(st->codec->pix_fmt, width, height);
575
    if (capabilities & V4L2_CAP_STREAMING) {
576
        s->io_method = io_mmap;
577 c7238c72 Luca Abeni
        res = mmap_init(s1);
578 eaddc471 R. Brian Anderson
        if (res == 0) {
579 c7238c72 Luca Abeni
            res = mmap_start(s1);
580 eaddc471 R. Brian Anderson
        }
581 0a7b514f Luca Abeni
    } else {
582
        s->io_method = io_read;
583 c7238c72 Luca Abeni
        res = read_init(s1);
584 0a7b514f Luca Abeni
    }
585
    if (res < 0) {
586
        close(s->fd);
587
588 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
589 0a7b514f Luca Abeni
    }
590
    s->top_field_first = first_field(s->fd);
591
592
    st->codec->codec_type = CODEC_TYPE_VIDEO;
593
    st->codec->codec_id = CODEC_ID_RAWVIDEO;
594
    st->codec->width = width;
595
    st->codec->height = height;
596 e7b987dc Luca Abeni
    st->codec->time_base.den = ap->time_base.den;
597
    st->codec->time_base.num = ap->time_base.num;
598 0a7b514f Luca Abeni
    st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
599
600
    return 0;
601
}
602
603
static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
604
{
605
    struct video_data *s = s1->priv_data;
606
    int res;
607
608
    if (s->io_method == io_mmap) {
609 41536a60 Luca Abeni
        av_init_packet(pkt);
610
        res = mmap_read_frame(s1, pkt);
611 0a7b514f Luca Abeni
    } else if (s->io_method == io_read) {
612 41536a60 Luca Abeni
        if (av_new_packet(pkt, s->frame_size) < 0)
613 6f3e0b21 Panagiotis Issaris
            return AVERROR(EIO);
614 41536a60 Luca Abeni
615
        res = read_frame(s1, pkt);
616 0a7b514f Luca Abeni
    } else {
617 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
618 0a7b514f Luca Abeni
    }
619
    if (res < 0) {
620 411f5c6a Benoit Fouet
        return res;
621 0a7b514f Luca Abeni
    }
622
623
    if (s1->streams[0]->codec->coded_frame) {
624
        s1->streams[0]->codec->coded_frame->interlaced_frame = 1;
625
        s1->streams[0]->codec->coded_frame->top_field_first = s->top_field_first;
626
    }
627
628
    return s->frame_size;
629
}
630
631
static int v4l2_read_close(AVFormatContext *s1)
632
{
633
    struct video_data *s = s1->priv_data;
634
635
    if (s->io_method == io_mmap) {
636
        mmap_close(s);
637
    }
638
639
    close(s->fd);
640
    return 0;
641
}
642
643 ff70e601 Måns Rullgård
AVInputFormat v4l2_demuxer = {
644 0a7b514f Luca Abeni
    "video4linux2",
645 df2a3f27 Stefano Sabatini
    NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
646 0a7b514f Luca Abeni
    sizeof(struct video_data),
647
    NULL,
648
    v4l2_read_header,
649
    v4l2_read_packet,
650
    v4l2_read_close,
651
    .flags = AVFMT_NOFILE,
652
};