v4l2.c 22.6 KB
Newer Older
Luca Abeni's avatar
Luca Abeni committed
1 2
/*
 * Video4Linux2 grab interface
3 4
 * Copyright (c) 2000,2001 Fabrice Bellard
 * Copyright (c) 2006 Luca Abeni
Luca Abeni's avatar
Luca Abeni committed
5 6 7 8 9 10 11 12
 *
 * Part of this file is based on the V4L2 video capture example
 * (http://v4l2spec.bytesex.org/v4l2spec/capture.c)
 *
 * Thanks to Michael Niedermayer for providing the mapping between
 * V4L2_PIX_FMT_* and PIX_FMT_*
 *
 *
13
 * This file is part of Libav.
14
 *
15
 * Libav is free software; you can redistribute it and/or
Luca Abeni's avatar
Luca Abeni committed
16 17
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
18
 * version 2.1 of the License, or (at your option) any later version.
Luca Abeni's avatar
Luca Abeni committed
19
 *
20
 * Libav is distributed in the hope that it will be useful,
Luca Abeni's avatar
Luca Abeni committed
21 22 23 24 25
 * 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
26
 * License along with Libav; if not, write to the Free Software
Luca Abeni's avatar
Luca Abeni committed
27 28
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
29

30
#undef __STRICT_ANSI__ //workaround due to broken kernel headers
31
#include "config.h"
32
#include "libavformat/avformat.h"
33
#include "libavformat/internal.h"
Luca Abeni's avatar
Luca Abeni committed
34 35 36 37 38
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
39
#if HAVE_SYS_VIDEOIO_H
40 41
#include <sys/videoio.h>
#else
42
#include <linux/videodev2.h>
43
#endif
Luca Abeni's avatar
Luca Abeni committed
44
#include <time.h>
45
#include "libavutil/imgutils.h"
46 47
#include "libavutil/log.h"
#include "libavutil/opt.h"
48
#include "libavutil/parseutils.h"
49
#include "libavutil/pixdesc.h"
50
#include "libavutil/avstring.h"
Luca Abeni's avatar
Luca Abeni committed
51 52 53 54 55 56 57 58 59 60

static const int desired_video_buffers = 256;

enum io_method {
    io_read,
    io_mmap,
    io_userptr
};

struct video_data {
61
    AVClass *class;
Luca Abeni's avatar
Luca Abeni committed
62 63 64 65 66
    int fd;
    int frame_format; /* V4L2_PIX_FMT_* */
    enum io_method io_method;
    int width, height;
    int frame_size;
67
    int interlaced;
Luca Abeni's avatar
Luca Abeni committed
68 69 70 71 72
    int top_field_first;

    int buffers;
    void **buf_start;
    unsigned int *buf_len;
73
    char *standard;
74
    int channel;
75
    char *video_size; /**< String describing video size, set by a private option. */
76
    char *pixel_format; /**< Set by a private option. */
77
    char *framerate;    /**< Set by a private option. */
Luca Abeni's avatar
Luca Abeni committed
78 79
};

80 81 82 83 84
struct buff_data {
    int index;
    int fd;
};

Luca Abeni's avatar
Luca Abeni committed
85 86
struct fmt_map {
    enum PixelFormat ff_fmt;
87
    enum CodecID codec_id;
88
    uint32_t v4l2_fmt;
Luca Abeni's avatar
Luca Abeni committed
89 90 91
};

static struct fmt_map fmt_conversion_table[] = {
92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107
    //ff_fmt           codec_id           v4l2_fmt
    { PIX_FMT_YUV420P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV420  },
    { PIX_FMT_YUV422P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV422P },
    { PIX_FMT_YUYV422, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUYV    },
    { PIX_FMT_UYVY422, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_UYVY    },
    { PIX_FMT_YUV411P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV411P },
    { PIX_FMT_YUV410P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV410  },
    { PIX_FMT_RGB555,  CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555  },
    { PIX_FMT_RGB565,  CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565  },
    { PIX_FMT_BGR24,   CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR24   },
    { PIX_FMT_RGB24,   CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB24   },
    { PIX_FMT_BGRA,    CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32   },
    { PIX_FMT_GRAY8,   CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY    },
    { PIX_FMT_NV12,    CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_NV12    },
    { PIX_FMT_NONE,    CODEC_ID_MJPEG,    V4L2_PIX_FMT_MJPEG   },
    { PIX_FMT_NONE,    CODEC_ID_MJPEG,    V4L2_PIX_FMT_JPEG    },
Luca Abeni's avatar
Luca Abeni committed
108 109
};

110
static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
Luca Abeni's avatar
Luca Abeni committed
111 112 113
{
    struct v4l2_capability cap;
    int fd;
114
    int res, err;
115
    int flags = O_RDWR;
Luca Abeni's avatar
Luca Abeni committed
116

117 118 119 120
    if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
        flags |= O_NONBLOCK;
    }
    fd = open(ctx->filename, flags, 0);
Luca Abeni's avatar
Luca Abeni committed
121
    if (fd < 0) {
Luca Abeni's avatar
Luca Abeni committed
122
        av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
123
                 ctx->filename, strerror(errno));
Luca Abeni's avatar
Luca Abeni committed
124

125
        return AVERROR(errno);
Luca Abeni's avatar
Luca Abeni committed
126 127 128
    }

    res = ioctl(fd, VIDIOC_QUERYCAP, &cap);
129
    // ENOIOCTLCMD definition only availble on __KERNEL__
130
    if (res < 0 && ((err = errno) == 515)) {
Luca Abeni's avatar
Luca Abeni committed
131
        av_log(ctx, AV_LOG_ERROR, "QUERYCAP not implemented, probably V4L device but not supporting V4L2\n");
132
        close(fd);
133

134
        return AVERROR(515);
135
    }
Luca Abeni's avatar
Luca Abeni committed
136
    if (res < 0) {
Luca Abeni's avatar
Luca Abeni committed
137
        av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
Luca Abeni's avatar
Luca Abeni committed
138
                 strerror(errno));
139
        close(fd);
Luca Abeni's avatar
Luca Abeni committed
140

141
        return AVERROR(err);
Luca Abeni's avatar
Luca Abeni committed
142 143
    }
    if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) {
Luca Abeni's avatar
Luca Abeni committed
144
        av_log(ctx, AV_LOG_ERROR, "Not a video capture device\n");
145
        close(fd);
Luca Abeni's avatar
Luca Abeni committed
146

147
        return AVERROR(ENODEV);
Luca Abeni's avatar
Luca Abeni committed
148 149 150 151 152 153
    }
    *capabilities = cap.capabilities;

    return fd;
}

154
static int device_init(AVFormatContext *ctx, int *width, int *height, uint32_t pix_fmt)
Luca Abeni's avatar
Luca Abeni committed
155
{
Luca Abeni's avatar
Luca Abeni committed
156 157
    struct video_data *s = ctx->priv_data;
    int fd = s->fd;
Luca Abeni's avatar
Luca Abeni committed
158
    struct v4l2_format fmt;
159
    int res;
Luca Abeni's avatar
Luca Abeni committed
160 161 162

    memset(&fmt, 0, sizeof(struct v4l2_format));
    fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
163 164
    fmt.fmt.pix.width = *width;
    fmt.fmt.pix.height = *height;
Luca Abeni's avatar
Luca Abeni committed
165
    fmt.fmt.pix.pixelformat = pix_fmt;
166
    fmt.fmt.pix.field = V4L2_FIELD_ANY;
167 168
    res = ioctl(fd, VIDIOC_S_FMT, &fmt);
    if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
Luca Abeni's avatar
Luca Abeni committed
169
        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);
170 171 172 173
        *width = fmt.fmt.pix.width;
        *height = fmt.fmt.pix.height;
    }

174 175 176 177 178
    if (pix_fmt != fmt.fmt.pix.pixelformat) {
        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);
        res = -1;
    }

179 180 181 182 183
    if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
        av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver using the interlaced mode");
        s->interlaced = 1;
    }

184
    return res;
Luca Abeni's avatar
Luca Abeni committed
185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202
}

static int first_field(int fd)
{
    int res;
    v4l2_std_id std;

    res = ioctl(fd, VIDIOC_G_STD, &std);
    if (res < 0) {
        return 0;
    }
    if (std & V4L2_STD_NTSC) {
        return 0;
    }

    return 1;
}

203
static uint32_t fmt_ff2v4l(enum PixelFormat pix_fmt, enum CodecID codec_id)
Luca Abeni's avatar
Luca Abeni committed
204 205 206
{
    int i;

207
    for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
208 209 210 211
        if ((codec_id == CODEC_ID_NONE ||
             fmt_conversion_table[i].codec_id == codec_id) &&
            (pix_fmt == PIX_FMT_NONE ||
             fmt_conversion_table[i].ff_fmt == pix_fmt)) {
Luca Abeni's avatar
Luca Abeni committed
212 213 214 215 216 217 218
            return fmt_conversion_table[i].v4l2_fmt;
        }
    }

    return 0;
}

219
static enum PixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum CodecID codec_id)
Luca Abeni's avatar
Luca Abeni committed
220 221 222
{
    int i;

223
    for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
224 225
        if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt &&
            fmt_conversion_table[i].codec_id == codec_id) {
Luca Abeni's avatar
Luca Abeni committed
226 227 228 229
            return fmt_conversion_table[i].ff_fmt;
        }
    }

230
    return PIX_FMT_NONE;
Luca Abeni's avatar
Luca Abeni committed
231 232
}

233 234 235 236 237 238 239 240 241 242 243 244 245
static enum CodecID fmt_v4l2codec(uint32_t v4l2_fmt)
{
    int i;

    for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
        if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt) {
            return fmt_conversion_table[i].codec_id;
        }
    }

    return CODEC_ID_NONE;
}

Luca Abeni's avatar
Luca Abeni committed
246
static int mmap_init(AVFormatContext *ctx)
Luca Abeni's avatar
Luca Abeni committed
247
{
Luca Abeni's avatar
Luca Abeni committed
248
    struct video_data *s = ctx->priv_data;
Luca Abeni's avatar
Luca Abeni committed
249 250 251 252 253 254 255
    struct v4l2_requestbuffers req;
    int i, res;

    memset(&req, 0, sizeof(struct v4l2_requestbuffers));
    req.count = desired_video_buffers;
    req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    req.memory = V4L2_MEMORY_MMAP;
256
    res = ioctl(s->fd, VIDIOC_REQBUFS, &req);
Luca Abeni's avatar
Luca Abeni committed
257 258
    if (res < 0) {
        if (errno == EINVAL) {
Luca Abeni's avatar
Luca Abeni committed
259
            av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n");
Luca Abeni's avatar
Luca Abeni committed
260
        } else {
Luca Abeni's avatar
Luca Abeni committed
261
            av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n");
Luca Abeni's avatar
Luca Abeni committed
262 263
        }

264
        return AVERROR(errno);
Luca Abeni's avatar
Luca Abeni committed
265 266 267
    }

    if (req.count < 2) {
Luca Abeni's avatar
Luca Abeni committed
268
        av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
Luca Abeni's avatar
Luca Abeni committed
269

270
        return AVERROR(ENOMEM);
Luca Abeni's avatar
Luca Abeni committed
271 272 273 274
    }
    s->buffers = req.count;
    s->buf_start = av_malloc(sizeof(void *) * s->buffers);
    if (s->buf_start == NULL) {
Luca Abeni's avatar
Luca Abeni committed
275
        av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
Luca Abeni's avatar
Luca Abeni committed
276

277
        return AVERROR(ENOMEM);
Luca Abeni's avatar
Luca Abeni committed
278 279 280
    }
    s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
    if (s->buf_len == NULL) {
Luca Abeni's avatar
Luca Abeni committed
281
        av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
Luca Abeni's avatar
Luca Abeni committed
282 283
        av_free(s->buf_start);

284
        return AVERROR(ENOMEM);
Luca Abeni's avatar
Luca Abeni committed
285 286 287 288 289 290 291 292 293
    }

    for (i = 0; i < req.count; i++) {
        struct v4l2_buffer buf;

        memset(&buf, 0, sizeof(struct v4l2_buffer));
        buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        buf.memory = V4L2_MEMORY_MMAP;
        buf.index = i;
294
        res = ioctl(s->fd, VIDIOC_QUERYBUF, &buf);
Luca Abeni's avatar
Luca Abeni committed
295
        if (res < 0) {
Luca Abeni's avatar
Luca Abeni committed
296
            av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
Luca Abeni's avatar
Luca Abeni committed
297

298
            return AVERROR(errno);
Luca Abeni's avatar
Luca Abeni committed
299 300 301
        }

        s->buf_len[i] = buf.length;
302
        if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
Luca Abeni's avatar
Luca Abeni committed
303
            av_log(ctx, AV_LOG_ERROR, "Buffer len [%d] = %d != %d\n", i, s->buf_len[i], s->frame_size);
Luca Abeni's avatar
Luca Abeni committed
304 305 306 307 308 309

            return -1;
        }
        s->buf_start[i] = mmap (NULL, buf.length,
                        PROT_READ | PROT_WRITE, MAP_SHARED, s->fd, buf.m.offset);
        if (s->buf_start[i] == MAP_FAILED) {
Luca Abeni's avatar
Luca Abeni committed
310
            av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
Luca Abeni's avatar
Luca Abeni committed
311

312
            return AVERROR(errno);
Luca Abeni's avatar
Luca Abeni committed
313 314 315 316 317 318
        }
    }

    return 0;
}

Luca Abeni's avatar
Luca Abeni committed
319
static int read_init(AVFormatContext *ctx)
Luca Abeni's avatar
Luca Abeni committed
320 321 322 323
{
    return -1;
}

324 325 326 327 328 329
static void mmap_release_buffer(AVPacket *pkt)
{
    struct v4l2_buffer buf;
    int res, fd;
    struct buff_data *buf_descriptor = pkt->priv;

330 331 332 333
    if (pkt->data == NULL) {
         return;
    }

334 335 336 337 338 339 340
    memset(&buf, 0, sizeof(struct v4l2_buffer));
    buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    buf.memory = V4L2_MEMORY_MMAP;
    buf.index = buf_descriptor->index;
    fd = buf_descriptor->fd;
    av_free(buf_descriptor);

341
    res = ioctl(fd, VIDIOC_QBUF, &buf);
342
    if (res < 0) {
343
        av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno));
344 345 346 347 348 349
    }
    pkt->data = NULL;
    pkt->size = 0;
}

static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
Luca Abeni's avatar
Luca Abeni committed
350
{
Luca Abeni's avatar
Luca Abeni committed
351
    struct video_data *s = ctx->priv_data;
Luca Abeni's avatar
Luca Abeni committed
352
    struct v4l2_buffer buf;
353
    struct buff_data *buf_descriptor;
Luca Abeni's avatar
Luca Abeni committed
354 355 356 357 358 359 360
    int res;

    memset(&buf, 0, sizeof(struct v4l2_buffer));
    buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    buf.memory = V4L2_MEMORY_MMAP;

    /* FIXME: Some special treatment might be needed in case of loss of signal... */
361
    while ((res = ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
Luca Abeni's avatar
Luca Abeni committed
362
    if (res < 0) {
363 364 365 366 367
        if (errno == EAGAIN) {
            pkt->size = 0;

            return AVERROR(EAGAIN);
        }
Luca Abeni's avatar
Luca Abeni committed
368
        av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", strerror(errno));
Luca Abeni's avatar
Luca Abeni committed
369

370
        return AVERROR(errno);
Luca Abeni's avatar
Luca Abeni committed
371 372
    }
    assert (buf.index < s->buffers);
373
    if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
Luca Abeni's avatar
Luca Abeni committed
374
        av_log(ctx, AV_LOG_ERROR, "The v4l2 frame is %d bytes, but %d bytes are expected\n", buf.bytesused, s->frame_size);
375

376
        return AVERROR_INVALIDDATA;
377 378
    }

Luca Abeni's avatar
Luca Abeni committed
379
    /* Image is at s->buff_start[buf.index] */
380 381 382 383 384 385 386 387 388 389
    pkt->data= s->buf_start[buf.index];
    pkt->size = buf.bytesused;
    pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
    pkt->destruct = mmap_release_buffer;
    buf_descriptor = av_malloc(sizeof(struct buff_data));
    if (buf_descriptor == NULL) {
        /* Something went wrong... Since av_malloc() failed, we cannot even
         * allocate a buffer for memcopying into it
         */
        av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
390
        res = ioctl(s->fd, VIDIOC_QBUF, &buf);
Luca Abeni's avatar
Luca Abeni committed
391

392
        return AVERROR(ENOMEM);
Luca Abeni's avatar
Luca Abeni committed
393
    }
394 395 396
    buf_descriptor->fd = s->fd;
    buf_descriptor->index = buf.index;
    pkt->priv = buf_descriptor;
Luca Abeni's avatar
Luca Abeni committed
397 398 399 400

    return s->buf_len[buf.index];
}

401
static int read_frame(AVFormatContext *ctx, AVPacket *pkt)
Luca Abeni's avatar
Luca Abeni committed
402 403 404 405
{
    return -1;
}

Luca Abeni's avatar
Luca Abeni committed
406
static int mmap_start(AVFormatContext *ctx)
Luca Abeni's avatar
Luca Abeni committed
407
{
Luca Abeni's avatar
Luca Abeni committed
408
    struct video_data *s = ctx->priv_data;
Luca Abeni's avatar
Luca Abeni committed
409 410 411 412 413 414 415 416 417 418 419
    enum v4l2_buf_type type;
    int i, res;

    for (i = 0; i < s->buffers; i++) {
        struct v4l2_buffer buf;

        memset(&buf, 0, sizeof(struct v4l2_buffer));
        buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        buf.memory = V4L2_MEMORY_MMAP;
        buf.index  = i;

420
        res = ioctl(s->fd, VIDIOC_QBUF, &buf);
Luca Abeni's avatar
Luca Abeni committed
421
        if (res < 0) {
Luca Abeni's avatar
Luca Abeni committed
422
            av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno));
Luca Abeni's avatar
Luca Abeni committed
423

424
            return AVERROR(errno);
Luca Abeni's avatar
Luca Abeni committed
425 426 427 428
        }
    }

    type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
429
    res = ioctl(s->fd, VIDIOC_STREAMON, &type);
Luca Abeni's avatar
Luca Abeni committed
430
    if (res < 0) {
Luca Abeni's avatar
Luca Abeni committed
431
        av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", strerror(errno));
Luca Abeni's avatar
Luca Abeni committed
432

433
        return AVERROR(errno);
Luca Abeni's avatar
Luca Abeni committed
434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455
    }

    return 0;
}

static void mmap_close(struct video_data *s)
{
    enum v4l2_buf_type type;
    int i;

    type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    /* We do not check for the result, because we could
     * not do anything about it anyway...
     */
    ioctl(s->fd, VIDIOC_STREAMOFF, &type);
    for (i = 0; i < s->buffers; i++) {
        munmap(s->buf_start[i], s->buf_len[i]);
    }
    av_free(s->buf_start);
    av_free(s->buf_len);
}

456
static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap)
457 458 459 460
{
    struct video_data *s = s1->priv_data;
    struct v4l2_input input;
    struct v4l2_standard standard;
461 462
    struct v4l2_streamparm streamparm = { 0 };
    struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe;
463
    int i, ret;
464
    AVRational framerate_q;
465

466 467
    streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

468
    if (s->framerate && (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
469
        av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
470 471
        return ret;
    }
472

Anton Khirnov's avatar
Anton Khirnov committed
473 474 475 476 477 478 479
    /* set tv video input */
    memset (&input, 0, sizeof (input));
    input.index = s->channel;
    if (ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
        av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n");
        return AVERROR(EIO);
    }
480

Anton Khirnov's avatar
Anton Khirnov committed
481 482 483 484 485 486 487
    av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n",
            s->channel, input.name);
    if (ioctl(s->fd, VIDIOC_S_INPUT, &input.index) < 0) {
        av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set input(%d) failed\n",
                s->channel);
        return AVERROR(EIO);
    }
488

489
    if (s->standard) {
Luca Abeni's avatar
Luca Abeni committed
490
        av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
491
               s->standard);
Luca Abeni's avatar
Luca Abeni committed
492 493 494 495 496 497
        /* set tv standard */
        memset (&standard, 0, sizeof (standard));
        for(i=0;;i++) {
            standard.index = i;
            if (ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
                av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
498
                       s->standard);
499
                return AVERROR(EIO);
Luca Abeni's avatar
Luca Abeni committed
500 501
            }

502
            if (!av_strcasecmp(standard.name, s->standard)) {
Luca Abeni's avatar
Luca Abeni committed
503 504 505 506 507
                break;
            }
        }

        av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
508
               s->standard, (uint64_t)standard.id);
Luca Abeni's avatar
Luca Abeni committed
509
        if (ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
510
            av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
511
                   s->standard);
512
            return AVERROR(EIO);
513
        }
514
    }
515

516
    if (framerate_q.num && framerate_q.den) {
517
        av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
518 519 520
               framerate_q.den, framerate_q.num);
        tpf->numerator   = framerate_q.den;
        tpf->denominator = framerate_q.num;
521 522 523
        if (ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) {
            av_log(s1, AV_LOG_ERROR,
                   "ioctl set time per frame(%d/%d) failed\n",
524
                   framerate_q.den, framerate_q.num);
525 526 527
            return AVERROR(EIO);
        }

528 529
        if (framerate_q.num != tpf->denominator ||
            framerate_q.den != tpf->numerator) {
530 531
            av_log(s1, AV_LOG_INFO,
                   "The driver changed the time per frame from %d/%d to %d/%d\n",
532
                   framerate_q.den, framerate_q.num,
533 534
                   tpf->numerator, tpf->denominator);
        }
535
    } else {
536
        /* if timebase value is not set, read the timebase value from the driver */
537 538 539 540
        if (ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) {
            av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n", strerror(errno));
            return AVERROR(errno);
        }
541
    }
542 543
    s1->streams[0]->codec->time_base.den = tpf->denominator;
    s1->streams[0]->codec->time_base.num = tpf->numerator;
544

545 546 547
    return 0;
}

548
static uint32_t device_try_init(AVFormatContext *s1,
549
                                enum PixelFormat pix_fmt,
550 551 552
                                int *width,
                                int *height,
                                enum CodecID *codec_id)
553
{
554
    uint32_t desired_format = fmt_ff2v4l(pix_fmt, s1->video_codec_id);
555 556 557 558 559 560 561

    if (desired_format == 0 ||
        device_init(s1, width, height, desired_format) < 0) {
        int i;

        desired_format = 0;
        for (i = 0; i<FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
562 563
            if (s1->video_codec_id == CODEC_ID_NONE ||
                fmt_conversion_table[i].codec_id == s1->video_codec_id) {
564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579
                desired_format = fmt_conversion_table[i].v4l2_fmt;
                if (device_init(s1, width, height, desired_format) >= 0) {
                    break;
                }
                desired_format = 0;
            }
        }
    }
    if (desired_format != 0) {
        *codec_id = fmt_v4l2codec(desired_format);
        assert(*codec_id != CODEC_ID_NONE);
    }

    return desired_format;
}

Luca Abeni's avatar
Luca Abeni committed
580 581 582 583
static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
{
    struct video_data *s = s1->priv_data;
    AVStream *st;
584
    int res = 0;
Luca Abeni's avatar
Luca Abeni committed
585
    uint32_t desired_format, capabilities;
586
    enum CodecID codec_id;
587
    enum PixelFormat pix_fmt = PIX_FMT_NONE;
Luca Abeni's avatar
Luca Abeni committed
588

589
    st = avformat_new_stream(s1, NULL);
Luca Abeni's avatar
Luca Abeni committed
590
    if (!st) {
591 592
        res = AVERROR(ENOMEM);
        goto out;
Luca Abeni's avatar
Luca Abeni committed
593
    }
594
    avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
Luca Abeni's avatar
Luca Abeni committed
595

596
    if (s->video_size && (res = av_parse_video_size(&s->width, &s->height, s->video_size)) < 0) {
597
        av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n", s->video_size);
598 599
        goto out;
    }
600 601 602 603 604
    if (s->pixel_format && (pix_fmt = av_get_pix_fmt(s->pixel_format)) == PIX_FMT_NONE) {
        av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n", s->pixel_format);
        res = AVERROR(EINVAL);
        goto out;
    }
Luca Abeni's avatar
Luca Abeni committed
605 606

    capabilities = 0;
607
    s->fd = device_open(s1, &capabilities);
Luca Abeni's avatar
Luca Abeni committed
608
    if (s->fd < 0) {
609 610
        res = AVERROR(EIO);
        goto out;
Luca Abeni's avatar
Luca Abeni committed
611
    }
612
    av_log(s1, AV_LOG_VERBOSE, "[%d]Capabilities: %x\n", s->fd, capabilities);
Luca Abeni's avatar
Luca Abeni committed
613

614 615 616
    if (!s->width && !s->height) {
        struct v4l2_format fmt;

617
        av_log(s1, AV_LOG_VERBOSE, "Querying the device for the current frame size\n");
618 619 620
        fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
            av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", strerror(errno));
621 622
            res = AVERROR(errno);
            goto out;
623 624 625
        }
        s->width  = fmt.fmt.pix.width;
        s->height = fmt.fmt.pix.height;
626
        av_log(s1, AV_LOG_VERBOSE, "Setting frame size to %dx%d\n", s->width, s->height);
627 628
    }

629
    desired_format = device_try_init(s1, pix_fmt, &s->width, &s->height, &codec_id);
Luca Abeni's avatar
Luca Abeni committed
630
    if (desired_format == 0) {
631
        av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for "
632
               "codec_id %d, pix_fmt %d.\n", s1->video_codec_id, pix_fmt);
Luca Abeni's avatar
Luca Abeni committed
633 634
        close(s->fd);

635 636
        res = AVERROR(EIO);
        goto out;
Luca Abeni's avatar
Luca Abeni committed
637
    }
638 639
    if ((res = av_image_check_size(s->width, s->height, 0, s1) < 0))
        goto out;
Luca Abeni's avatar
Luca Abeni committed
640 641
    s->frame_format = desired_format;

642 643
    if ((res = v4l2_set_parameters(s1, ap) < 0))
        goto out;
644

645
    st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id);
646
    s->frame_size = avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
Luca Abeni's avatar
Luca Abeni committed
647 648
    if (capabilities & V4L2_CAP_STREAMING) {
        s->io_method = io_mmap;
Luca Abeni's avatar
Luca Abeni committed
649
        res = mmap_init(s1);
R. Brian Anderson's avatar
R. Brian Anderson committed
650
        if (res == 0) {
Luca Abeni's avatar
Luca Abeni committed
651
            res = mmap_start(s1);
R. Brian Anderson's avatar
R. Brian Anderson committed
652
        }
Luca Abeni's avatar
Luca Abeni committed
653 654
    } else {
        s->io_method = io_read;
Luca Abeni's avatar
Luca Abeni committed
655
        res = read_init(s1);
Luca Abeni's avatar
Luca Abeni committed
656 657 658 659
    }
    if (res < 0) {
        close(s->fd);

660 661
        res = AVERROR(EIO);
        goto out;
Luca Abeni's avatar
Luca Abeni committed
662 663 664
    }
    s->top_field_first = first_field(s->fd);

665
    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
666
    st->codec->codec_id = codec_id;
667 668
    st->codec->width = s->width;
    st->codec->height = s->height;
Luca Abeni's avatar
Luca Abeni committed
669 670
    st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;

671 672
out:
    return res;
Luca Abeni's avatar
Luca Abeni committed
673 674 675 676 677 678 679 680
}

static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
{
    struct video_data *s = s1->priv_data;
    int res;

    if (s->io_method == io_mmap) {
681 682
        av_init_packet(pkt);
        res = mmap_read_frame(s1, pkt);
Luca Abeni's avatar
Luca Abeni committed
683
    } else if (s->io_method == io_read) {
684
        if (av_new_packet(pkt, s->frame_size) < 0)
685
            return AVERROR(EIO);
686 687

        res = read_frame(s1, pkt);
Luca Abeni's avatar
Luca Abeni committed
688
    } else {
689
        return AVERROR(EIO);
Luca Abeni's avatar
Luca Abeni committed
690 691
    }
    if (res < 0) {
692
        return res;
Luca Abeni's avatar
Luca Abeni committed
693 694
    }

695
    if (s1->streams[0]->codec->coded_frame && s->interlaced) {
Luca Abeni's avatar
Luca Abeni committed
696 697 698 699
        s1->streams[0]->codec->coded_frame->interlaced_frame = 1;
        s1->streams[0]->codec->coded_frame->top_field_first = s->top_field_first;
    }

700
    return pkt->size;
Luca Abeni's avatar
Luca Abeni committed
701 702 703 704 705 706 707 708 709 710 711 712 713 714
}

static int v4l2_read_close(AVFormatContext *s1)
{
    struct video_data *s = s1->priv_data;

    if (s->io_method == io_mmap) {
        mmap_close(s);
    }

    close(s->fd);
    return 0;
}

715 716
#define OFFSET(x) offsetof(struct video_data, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
717
static const AVOption options[] = {
718 719 720 721 722
    { "standard",     "TV standard, used only by analog frame grabber",            OFFSET(standard),     AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0,       DEC },
    { "channel",      "TV channel, used only by frame grabber",                    OFFSET(channel),      AV_OPT_TYPE_INT,    {.dbl = 0 },    0, INT_MAX, DEC },
    { "video_size",   "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size),   AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       DEC },
    { "pixel_format", "",                                                          OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       DEC },
    { "framerate",    "",                                                          OFFSET(framerate),    AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       DEC },
723 724 725 726 727 728 729 730 731 732
    { NULL },
};

static const AVClass v4l2_class = {
    .class_name = "V4L2 indev",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

733
AVInputFormat ff_v4l2_demuxer = {
734 735 736 737 738 739 740 741
    .name           = "video4linux2",
    .long_name      = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
    .priv_data_size = sizeof(struct video_data),
    .read_header    = v4l2_read_header,
    .read_packet    = v4l2_read_packet,
    .read_close     = v4l2_read_close,
    .flags          = AVFMT_NOFILE,
    .priv_class     = &v4l2_class,
Luca Abeni's avatar
Luca Abeni committed
742
};