| 1 | /* |
| 2 | * Copyright (c) 2000,2001 Fabrice Bellard |
| 3 | * Copyright (c) 2006 Luca Abeni |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * Video4Linux2 grab interface |
| 25 | * |
| 26 | * Part of this file is based on the V4L2 video capture example |
| 27 | * (http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html) |
| 28 | * |
| 29 | * Thanks to Michael Niedermayer for providing the mapping between |
| 30 | * V4L2_PIX_FMT_* and AV_PIX_FMT_* |
| 31 | */ |
| 32 | |
| 33 | #include "v4l2-common.h" |
| 34 | |
| 35 | #if CONFIG_LIBV4L2 |
| 36 | #include <libv4l2.h> |
| 37 | #endif |
| 38 | |
| 39 | static const int desired_video_buffers = 256; |
| 40 | |
| 41 | #define V4L_ALLFORMATS 3 |
| 42 | #define V4L_RAWFORMATS 1 |
| 43 | #define V4L_COMPFORMATS 2 |
| 44 | |
| 45 | /** |
| 46 | * Return timestamps to the user exactly as returned by the kernel |
| 47 | */ |
| 48 | #define V4L_TS_DEFAULT 0 |
| 49 | /** |
| 50 | * Autodetect the kind of timestamps returned by the kernel and convert to |
| 51 | * absolute (wall clock) timestamps. |
| 52 | */ |
| 53 | #define V4L_TS_ABS 1 |
| 54 | /** |
| 55 | * Assume kernel timestamps are from the monotonic clock and convert to |
| 56 | * absolute timestamps. |
| 57 | */ |
| 58 | #define V4L_TS_MONO2ABS 2 |
| 59 | |
| 60 | /** |
| 61 | * Once the kind of timestamps returned by the kernel have been detected, |
| 62 | * the value of the timefilter (NULL or not) determines whether a conversion |
| 63 | * takes place. |
| 64 | */ |
| 65 | #define V4L_TS_CONVERT_READY V4L_TS_DEFAULT |
| 66 | |
| 67 | struct video_data { |
| 68 | AVClass *class; |
| 69 | int fd; |
| 70 | int frame_format; /* V4L2_PIX_FMT_* */ |
| 71 | int width, height; |
| 72 | int frame_size; |
| 73 | int interlaced; |
| 74 | int top_field_first; |
| 75 | int ts_mode; |
| 76 | TimeFilter *timefilter; |
| 77 | int64_t last_time_m; |
| 78 | |
| 79 | int buffers; |
| 80 | volatile int buffers_queued; |
| 81 | void **buf_start; |
| 82 | unsigned int *buf_len; |
| 83 | char *standard; |
| 84 | v4l2_std_id std_id; |
| 85 | int channel; |
| 86 | char *pixel_format; /**< Set by a private option. */ |
| 87 | int list_format; /**< Set by a private option. */ |
| 88 | int list_standard; /**< Set by a private option. */ |
| 89 | char *framerate; /**< Set by a private option. */ |
| 90 | |
| 91 | int use_libv4l2; |
| 92 | int (*open_f)(const char *file, int oflag, ...); |
| 93 | int (*close_f)(int fd); |
| 94 | int (*dup_f)(int fd); |
| 95 | int (*ioctl_f)(int fd, unsigned long int request, ...); |
| 96 | ssize_t (*read_f)(int fd, void *buffer, size_t n); |
| 97 | void *(*mmap_f)(void *start, size_t length, int prot, int flags, int fd, int64_t offset); |
| 98 | int (*munmap_f)(void *_start, size_t length); |
| 99 | }; |
| 100 | |
| 101 | struct buff_data { |
| 102 | struct video_data *s; |
| 103 | int index; |
| 104 | }; |
| 105 | |
| 106 | static int device_open(AVFormatContext *ctx) |
| 107 | { |
| 108 | struct video_data *s = ctx->priv_data; |
| 109 | struct v4l2_capability cap; |
| 110 | int fd; |
| 111 | int ret; |
| 112 | int flags = O_RDWR; |
| 113 | |
| 114 | #define SET_WRAPPERS(prefix) do { \ |
| 115 | s->open_f = prefix ## open; \ |
| 116 | s->close_f = prefix ## close; \ |
| 117 | s->dup_f = prefix ## dup; \ |
| 118 | s->ioctl_f = prefix ## ioctl; \ |
| 119 | s->read_f = prefix ## read; \ |
| 120 | s->mmap_f = prefix ## mmap; \ |
| 121 | s->munmap_f = prefix ## munmap; \ |
| 122 | } while (0) |
| 123 | |
| 124 | if (s->use_libv4l2) { |
| 125 | #if CONFIG_LIBV4L2 |
| 126 | SET_WRAPPERS(v4l2_); |
| 127 | #else |
| 128 | av_log(ctx, AV_LOG_ERROR, "libavdevice is not build with libv4l2 support.\n"); |
| 129 | return AVERROR(EINVAL); |
| 130 | #endif |
| 131 | } else { |
| 132 | SET_WRAPPERS(); |
| 133 | } |
| 134 | |
| 135 | #define v4l2_open s->open_f |
| 136 | #define v4l2_close s->close_f |
| 137 | #define v4l2_dup s->dup_f |
| 138 | #define v4l2_ioctl s->ioctl_f |
| 139 | #define v4l2_read s->read_f |
| 140 | #define v4l2_mmap s->mmap_f |
| 141 | #define v4l2_munmap s->munmap_f |
| 142 | |
| 143 | if (ctx->flags & AVFMT_FLAG_NONBLOCK) { |
| 144 | flags |= O_NONBLOCK; |
| 145 | } |
| 146 | |
| 147 | fd = v4l2_open(ctx->filename, flags, 0); |
| 148 | if (fd < 0) { |
| 149 | ret = AVERROR(errno); |
| 150 | av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s: %s\n", |
| 151 | ctx->filename, av_err2str(ret)); |
| 152 | return ret; |
| 153 | } |
| 154 | |
| 155 | if (v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) { |
| 156 | ret = AVERROR(errno); |
| 157 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n", |
| 158 | av_err2str(ret)); |
| 159 | goto fail; |
| 160 | } |
| 161 | |
| 162 | av_log(ctx, AV_LOG_VERBOSE, "fd:%d capabilities:%x\n", |
| 163 | fd, cap.capabilities); |
| 164 | |
| 165 | if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) { |
| 166 | av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n"); |
| 167 | ret = AVERROR(ENODEV); |
| 168 | goto fail; |
| 169 | } |
| 170 | |
| 171 | if (!(cap.capabilities & V4L2_CAP_STREAMING)) { |
| 172 | av_log(ctx, AV_LOG_ERROR, |
| 173 | "The device does not support the streaming I/O method.\n"); |
| 174 | ret = AVERROR(ENOSYS); |
| 175 | goto fail; |
| 176 | } |
| 177 | |
| 178 | return fd; |
| 179 | |
| 180 | fail: |
| 181 | v4l2_close(fd); |
| 182 | return ret; |
| 183 | } |
| 184 | |
| 185 | static int device_init(AVFormatContext *ctx, int *width, int *height, |
| 186 | uint32_t pix_fmt) |
| 187 | { |
| 188 | struct video_data *s = ctx->priv_data; |
| 189 | struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE }; |
| 190 | struct v4l2_pix_format *pix = &fmt.fmt.pix; |
| 191 | int res = 0; |
| 192 | |
| 193 | pix->width = *width; |
| 194 | pix->height = *height; |
| 195 | pix->pixelformat = pix_fmt; |
| 196 | pix->field = V4L2_FIELD_ANY; |
| 197 | |
| 198 | if (v4l2_ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0) |
| 199 | res = AVERROR(errno); |
| 200 | |
| 201 | if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) { |
| 202 | av_log(ctx, AV_LOG_INFO, |
| 203 | "The V4L2 driver changed the video from %dx%d to %dx%d\n", |
| 204 | *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height); |
| 205 | *width = fmt.fmt.pix.width; |
| 206 | *height = fmt.fmt.pix.height; |
| 207 | } |
| 208 | |
| 209 | if (pix_fmt != fmt.fmt.pix.pixelformat) { |
| 210 | av_log(ctx, AV_LOG_DEBUG, |
| 211 | "The V4L2 driver changed the pixel format " |
| 212 | "from 0x%08X to 0x%08X\n", |
| 213 | pix_fmt, fmt.fmt.pix.pixelformat); |
| 214 | res = AVERROR(EINVAL); |
| 215 | } |
| 216 | |
| 217 | if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) { |
| 218 | av_log(ctx, AV_LOG_DEBUG, |
| 219 | "The V4L2 driver is using the interlaced mode\n"); |
| 220 | s->interlaced = 1; |
| 221 | } |
| 222 | |
| 223 | return res; |
| 224 | } |
| 225 | |
| 226 | static int first_field(const struct video_data *s) |
| 227 | { |
| 228 | int res; |
| 229 | v4l2_std_id std; |
| 230 | |
| 231 | res = v4l2_ioctl(s->fd, VIDIOC_G_STD, &std); |
| 232 | if (res < 0) |
| 233 | return 0; |
| 234 | if (std & V4L2_STD_NTSC) |
| 235 | return 0; |
| 236 | |
| 237 | return 1; |
| 238 | } |
| 239 | |
| 240 | #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE |
| 241 | static void list_framesizes(AVFormatContext *ctx, uint32_t pixelformat) |
| 242 | { |
| 243 | const struct video_data *s = ctx->priv_data; |
| 244 | struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat }; |
| 245 | |
| 246 | while(!v4l2_ioctl(s->fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) { |
| 247 | switch (vfse.type) { |
| 248 | case V4L2_FRMSIZE_TYPE_DISCRETE: |
| 249 | av_log(ctx, AV_LOG_INFO, " %ux%u", |
| 250 | vfse.discrete.width, vfse.discrete.height); |
| 251 | break; |
| 252 | case V4L2_FRMSIZE_TYPE_CONTINUOUS: |
| 253 | case V4L2_FRMSIZE_TYPE_STEPWISE: |
| 254 | av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}", |
| 255 | vfse.stepwise.min_width, |
| 256 | vfse.stepwise.max_width, |
| 257 | vfse.stepwise.step_width, |
| 258 | vfse.stepwise.min_height, |
| 259 | vfse.stepwise.max_height, |
| 260 | vfse.stepwise.step_height); |
| 261 | } |
| 262 | vfse.index++; |
| 263 | } |
| 264 | } |
| 265 | #endif |
| 266 | |
| 267 | static void list_formats(AVFormatContext *ctx, int type) |
| 268 | { |
| 269 | const struct video_data *s = ctx->priv_data; |
| 270 | struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE }; |
| 271 | |
| 272 | while(!v4l2_ioctl(s->fd, VIDIOC_ENUM_FMT, &vfd)) { |
| 273 | enum AVCodecID codec_id = avpriv_fmt_v4l2codec(vfd.pixelformat); |
| 274 | enum AVPixelFormat pix_fmt = avpriv_fmt_v4l2ff(vfd.pixelformat, codec_id); |
| 275 | |
| 276 | vfd.index++; |
| 277 | |
| 278 | if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) && |
| 279 | type & V4L_RAWFORMATS) { |
| 280 | const char *fmt_name = av_get_pix_fmt_name(pix_fmt); |
| 281 | av_log(ctx, AV_LOG_INFO, "Raw : %9s : %20s :", |
| 282 | fmt_name ? fmt_name : "Unsupported", |
| 283 | vfd.description); |
| 284 | } else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED && |
| 285 | type & V4L_COMPFORMATS) { |
| 286 | AVCodec *codec = avcodec_find_decoder(codec_id); |
| 287 | av_log(ctx, AV_LOG_INFO, "Compressed: %9s : %20s :", |
| 288 | codec ? codec->name : "Unsupported", |
| 289 | vfd.description); |
| 290 | } else { |
| 291 | continue; |
| 292 | } |
| 293 | |
| 294 | #ifdef V4L2_FMT_FLAG_EMULATED |
| 295 | if (vfd.flags & V4L2_FMT_FLAG_EMULATED) |
| 296 | av_log(ctx, AV_LOG_INFO, " Emulated :"); |
| 297 | #endif |
| 298 | #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE |
| 299 | list_framesizes(ctx, vfd.pixelformat); |
| 300 | #endif |
| 301 | av_log(ctx, AV_LOG_INFO, "\n"); |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | static void list_standards(AVFormatContext *ctx) |
| 306 | { |
| 307 | int ret; |
| 308 | struct video_data *s = ctx->priv_data; |
| 309 | struct v4l2_standard standard; |
| 310 | |
| 311 | if (s->std_id == 0) |
| 312 | return; |
| 313 | |
| 314 | for (standard.index = 0; ; standard.index++) { |
| 315 | if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) { |
| 316 | ret = AVERROR(errno); |
| 317 | if (ret == AVERROR(EINVAL)) { |
| 318 | break; |
| 319 | } else { |
| 320 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret)); |
| 321 | return; |
| 322 | } |
| 323 | } |
| 324 | av_log(ctx, AV_LOG_INFO, "%2d, %16"PRIx64", %s\n", |
| 325 | standard.index, (uint64_t)standard.id, standard.name); |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | static int mmap_init(AVFormatContext *ctx) |
| 330 | { |
| 331 | int i, res; |
| 332 | struct video_data *s = ctx->priv_data; |
| 333 | struct v4l2_requestbuffers req = { |
| 334 | .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, |
| 335 | .count = desired_video_buffers, |
| 336 | .memory = V4L2_MEMORY_MMAP |
| 337 | }; |
| 338 | |
| 339 | if (v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req) < 0) { |
| 340 | res = AVERROR(errno); |
| 341 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS): %s\n", av_err2str(res)); |
| 342 | return res; |
| 343 | } |
| 344 | |
| 345 | if (req.count < 2) { |
| 346 | av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n"); |
| 347 | return AVERROR(ENOMEM); |
| 348 | } |
| 349 | s->buffers = req.count; |
| 350 | s->buf_start = av_malloc_array(s->buffers, sizeof(void *)); |
| 351 | if (!s->buf_start) { |
| 352 | av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n"); |
| 353 | return AVERROR(ENOMEM); |
| 354 | } |
| 355 | s->buf_len = av_malloc_array(s->buffers, sizeof(unsigned int)); |
| 356 | if (!s->buf_len) { |
| 357 | av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n"); |
| 358 | av_free(s->buf_start); |
| 359 | return AVERROR(ENOMEM); |
| 360 | } |
| 361 | |
| 362 | for (i = 0; i < req.count; i++) { |
| 363 | struct v4l2_buffer buf = { |
| 364 | .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, |
| 365 | .index = i, |
| 366 | .memory = V4L2_MEMORY_MMAP |
| 367 | }; |
| 368 | if (v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf) < 0) { |
| 369 | res = AVERROR(errno); |
| 370 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF): %s\n", av_err2str(res)); |
| 371 | return res; |
| 372 | } |
| 373 | |
| 374 | s->buf_len[i] = buf.length; |
| 375 | if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) { |
| 376 | av_log(ctx, AV_LOG_ERROR, |
| 377 | "buf_len[%d] = %d < expected frame size %d\n", |
| 378 | i, s->buf_len[i], s->frame_size); |
| 379 | return AVERROR(ENOMEM); |
| 380 | } |
| 381 | s->buf_start[i] = v4l2_mmap(NULL, buf.length, |
| 382 | PROT_READ | PROT_WRITE, MAP_SHARED, |
| 383 | s->fd, buf.m.offset); |
| 384 | |
| 385 | if (s->buf_start[i] == MAP_FAILED) { |
| 386 | res = AVERROR(errno); |
| 387 | av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", av_err2str(res)); |
| 388 | return res; |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | return 0; |
| 393 | } |
| 394 | |
| 395 | #if FF_API_DESTRUCT_PACKET |
| 396 | static void dummy_release_buffer(AVPacket *pkt) |
| 397 | { |
| 398 | av_assert0(0); |
| 399 | } |
| 400 | #endif |
| 401 | |
| 402 | static int enqueue_buffer(struct video_data *s, struct v4l2_buffer *buf) |
| 403 | { |
| 404 | int res = 0; |
| 405 | |
| 406 | if (v4l2_ioctl(s->fd, VIDIOC_QBUF, buf) < 0) { |
| 407 | res = AVERROR(errno); |
| 408 | av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res)); |
| 409 | } else { |
| 410 | avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1); |
| 411 | } |
| 412 | |
| 413 | return res; |
| 414 | } |
| 415 | |
| 416 | static void mmap_release_buffer(void *opaque, uint8_t *data) |
| 417 | { |
| 418 | struct v4l2_buffer buf = { 0 }; |
| 419 | struct buff_data *buf_descriptor = opaque; |
| 420 | struct video_data *s = buf_descriptor->s; |
| 421 | |
| 422 | buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| 423 | buf.memory = V4L2_MEMORY_MMAP; |
| 424 | buf.index = buf_descriptor->index; |
| 425 | av_free(buf_descriptor); |
| 426 | |
| 427 | enqueue_buffer(s, &buf); |
| 428 | } |
| 429 | |
| 430 | #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC) |
| 431 | static int64_t av_gettime_monotonic(void) |
| 432 | { |
| 433 | return av_gettime_relative(); |
| 434 | } |
| 435 | #endif |
| 436 | |
| 437 | static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts) |
| 438 | { |
| 439 | struct video_data *s = ctx->priv_data; |
| 440 | int64_t now; |
| 441 | |
| 442 | now = av_gettime(); |
| 443 | if (s->ts_mode == V4L_TS_ABS && |
| 444 | ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE) { |
| 445 | av_log(ctx, AV_LOG_INFO, "Detected absolute timestamps\n"); |
| 446 | s->ts_mode = V4L_TS_CONVERT_READY; |
| 447 | return 0; |
| 448 | } |
| 449 | #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC) |
| 450 | if (ctx->streams[0]->avg_frame_rate.num) { |
| 451 | now = av_gettime_monotonic(); |
| 452 | if (s->ts_mode == V4L_TS_MONO2ABS || |
| 453 | (ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) { |
| 454 | AVRational tb = {AV_TIME_BASE, 1}; |
| 455 | int64_t period = av_rescale_q(1, tb, ctx->streams[0]->avg_frame_rate); |
| 456 | av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n"); |
| 457 | /* microseconds instead of seconds, MHz instead of Hz */ |
| 458 | s->timefilter = ff_timefilter_new(1, period, 1.0E-6); |
| 459 | if (!s->timefilter) |
| 460 | return AVERROR(ENOMEM); |
| 461 | s->ts_mode = V4L_TS_CONVERT_READY; |
| 462 | return 0; |
| 463 | } |
| 464 | } |
| 465 | #endif |
| 466 | av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n"); |
| 467 | return AVERROR(EIO); |
| 468 | } |
| 469 | |
| 470 | static int convert_timestamp(AVFormatContext *ctx, int64_t *ts) |
| 471 | { |
| 472 | struct video_data *s = ctx->priv_data; |
| 473 | |
| 474 | if (s->ts_mode) { |
| 475 | int r = init_convert_timestamp(ctx, *ts); |
| 476 | if (r < 0) |
| 477 | return r; |
| 478 | } |
| 479 | #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC) |
| 480 | if (s->timefilter) { |
| 481 | int64_t nowa = av_gettime(); |
| 482 | int64_t nowm = av_gettime_monotonic(); |
| 483 | ff_timefilter_update(s->timefilter, nowa, nowm - s->last_time_m); |
| 484 | s->last_time_m = nowm; |
| 485 | *ts = ff_timefilter_eval(s->timefilter, *ts - nowm); |
| 486 | } |
| 487 | #endif |
| 488 | return 0; |
| 489 | } |
| 490 | |
| 491 | static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt) |
| 492 | { |
| 493 | struct video_data *s = ctx->priv_data; |
| 494 | struct v4l2_buffer buf = { |
| 495 | .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, |
| 496 | .memory = V4L2_MEMORY_MMAP |
| 497 | }; |
| 498 | int res; |
| 499 | |
| 500 | /* FIXME: Some special treatment might be needed in case of loss of signal... */ |
| 501 | while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR)); |
| 502 | if (res < 0) { |
| 503 | if (errno == EAGAIN) { |
| 504 | pkt->size = 0; |
| 505 | return AVERROR(EAGAIN); |
| 506 | } |
| 507 | res = AVERROR(errno); |
| 508 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", av_err2str(res)); |
| 509 | return res; |
| 510 | } |
| 511 | |
| 512 | if (buf.index >= s->buffers) { |
| 513 | av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n"); |
| 514 | return AVERROR(EINVAL); |
| 515 | } |
| 516 | avpriv_atomic_int_add_and_fetch(&s->buffers_queued, -1); |
| 517 | // always keep at least one buffer queued |
| 518 | av_assert0(avpriv_atomic_int_get(&s->buffers_queued) >= 1); |
| 519 | |
| 520 | /* CPIA is a compressed format and we don't know the exact number of bytes |
| 521 | * used by a frame, so set it here as the driver announces it. |
| 522 | */ |
| 523 | if (ctx->video_codec_id == AV_CODEC_ID_CPIA) |
| 524 | s->frame_size = buf.bytesused; |
| 525 | |
| 526 | if (s->frame_size > 0 && buf.bytesused != s->frame_size) { |
| 527 | av_log(ctx, AV_LOG_ERROR, |
| 528 | "The v4l2 frame is %d bytes, but %d bytes are expected\n", |
| 529 | buf.bytesused, s->frame_size); |
| 530 | enqueue_buffer(s, &buf); |
| 531 | return AVERROR_INVALIDDATA; |
| 532 | } |
| 533 | |
| 534 | /* Image is at s->buff_start[buf.index] */ |
| 535 | if (avpriv_atomic_int_get(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) { |
| 536 | /* when we start getting low on queued buffers, fall back on copying data */ |
| 537 | res = av_new_packet(pkt, buf.bytesused); |
| 538 | if (res < 0) { |
| 539 | av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n"); |
| 540 | enqueue_buffer(s, &buf); |
| 541 | return res; |
| 542 | } |
| 543 | memcpy(pkt->data, s->buf_start[buf.index], buf.bytesused); |
| 544 | |
| 545 | res = enqueue_buffer(s, &buf); |
| 546 | if (res) { |
| 547 | av_free_packet(pkt); |
| 548 | return res; |
| 549 | } |
| 550 | } else { |
| 551 | struct buff_data *buf_descriptor; |
| 552 | |
| 553 | pkt->data = s->buf_start[buf.index]; |
| 554 | pkt->size = buf.bytesused; |
| 555 | #if FF_API_DESTRUCT_PACKET |
| 556 | FF_DISABLE_DEPRECATION_WARNINGS |
| 557 | pkt->destruct = dummy_release_buffer; |
| 558 | FF_ENABLE_DEPRECATION_WARNINGS |
| 559 | #endif |
| 560 | |
| 561 | buf_descriptor = av_malloc(sizeof(struct buff_data)); |
| 562 | if (!buf_descriptor) { |
| 563 | /* Something went wrong... Since av_malloc() failed, we cannot even |
| 564 | * allocate a buffer for memcpying into it |
| 565 | */ |
| 566 | av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n"); |
| 567 | enqueue_buffer(s, &buf); |
| 568 | |
| 569 | return AVERROR(ENOMEM); |
| 570 | } |
| 571 | buf_descriptor->index = buf.index; |
| 572 | buf_descriptor->s = s; |
| 573 | |
| 574 | pkt->buf = av_buffer_create(pkt->data, pkt->size, mmap_release_buffer, |
| 575 | buf_descriptor, 0); |
| 576 | if (!pkt->buf) { |
| 577 | av_log(ctx, AV_LOG_ERROR, "Failed to create a buffer\n"); |
| 578 | enqueue_buffer(s, &buf); |
| 579 | av_freep(&buf_descriptor); |
| 580 | return AVERROR(ENOMEM); |
| 581 | } |
| 582 | } |
| 583 | pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec; |
| 584 | convert_timestamp(ctx, &pkt->pts); |
| 585 | |
| 586 | return s->buf_len[buf.index]; |
| 587 | } |
| 588 | |
| 589 | static int mmap_start(AVFormatContext *ctx) |
| 590 | { |
| 591 | struct video_data *s = ctx->priv_data; |
| 592 | enum v4l2_buf_type type; |
| 593 | int i, res; |
| 594 | |
| 595 | for (i = 0; i < s->buffers; i++) { |
| 596 | struct v4l2_buffer buf = { |
| 597 | .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, |
| 598 | .index = i, |
| 599 | .memory = V4L2_MEMORY_MMAP |
| 600 | }; |
| 601 | |
| 602 | if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) { |
| 603 | res = AVERROR(errno); |
| 604 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res)); |
| 605 | return res; |
| 606 | } |
| 607 | } |
| 608 | s->buffers_queued = s->buffers; |
| 609 | |
| 610 | type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| 611 | if (v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type) < 0) { |
| 612 | res = AVERROR(errno); |
| 613 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", av_err2str(res)); |
| 614 | return res; |
| 615 | } |
| 616 | |
| 617 | return 0; |
| 618 | } |
| 619 | |
| 620 | static void mmap_close(struct video_data *s) |
| 621 | { |
| 622 | enum v4l2_buf_type type; |
| 623 | int i; |
| 624 | |
| 625 | type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| 626 | /* We do not check for the result, because we could |
| 627 | * not do anything about it anyway... |
| 628 | */ |
| 629 | v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type); |
| 630 | for (i = 0; i < s->buffers; i++) { |
| 631 | v4l2_munmap(s->buf_start[i], s->buf_len[i]); |
| 632 | } |
| 633 | av_free(s->buf_start); |
| 634 | av_free(s->buf_len); |
| 635 | } |
| 636 | |
| 637 | static int v4l2_set_parameters(AVFormatContext *ctx) |
| 638 | { |
| 639 | struct video_data *s = ctx->priv_data; |
| 640 | struct v4l2_standard standard = { 0 }; |
| 641 | struct v4l2_streamparm streamparm = { 0 }; |
| 642 | struct v4l2_fract *tpf; |
| 643 | AVRational framerate_q = { 0 }; |
| 644 | int i, ret; |
| 645 | |
| 646 | if (s->framerate && |
| 647 | (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) { |
| 648 | av_log(ctx, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", |
| 649 | s->framerate); |
| 650 | return ret; |
| 651 | } |
| 652 | |
| 653 | if (s->standard) { |
| 654 | if (s->std_id) { |
| 655 | ret = 0; |
| 656 | av_log(ctx, AV_LOG_DEBUG, "Setting standard: %s\n", s->standard); |
| 657 | /* set tv standard */ |
| 658 | for (i = 0; ; i++) { |
| 659 | standard.index = i; |
| 660 | if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) { |
| 661 | ret = AVERROR(errno); |
| 662 | break; |
| 663 | } |
| 664 | if (!av_strcasecmp(standard.name, s->standard)) |
| 665 | break; |
| 666 | } |
| 667 | if (ret < 0) { |
| 668 | av_log(ctx, AV_LOG_ERROR, "Unknown or unsupported standard '%s'\n", s->standard); |
| 669 | return ret; |
| 670 | } |
| 671 | |
| 672 | if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) { |
| 673 | ret = AVERROR(errno); |
| 674 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_STD): %s\n", av_err2str(ret)); |
| 675 | return ret; |
| 676 | } |
| 677 | } else { |
| 678 | av_log(ctx, AV_LOG_WARNING, |
| 679 | "This device does not support any standard\n"); |
| 680 | } |
| 681 | } |
| 682 | |
| 683 | /* get standard */ |
| 684 | if (v4l2_ioctl(s->fd, VIDIOC_G_STD, &s->std_id) == 0) { |
| 685 | tpf = &standard.frameperiod; |
| 686 | for (i = 0; ; i++) { |
| 687 | standard.index = i; |
| 688 | if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) { |
| 689 | ret = AVERROR(errno); |
| 690 | if (ret == AVERROR(EINVAL) |
| 691 | #ifdef ENODATA |
| 692 | || ret == AVERROR(ENODATA) |
| 693 | #endif |
| 694 | ) { |
| 695 | tpf = &streamparm.parm.capture.timeperframe; |
| 696 | break; |
| 697 | } |
| 698 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret)); |
| 699 | return ret; |
| 700 | } |
| 701 | if (standard.id == s->std_id) { |
| 702 | av_log(ctx, AV_LOG_DEBUG, |
| 703 | "Current standard: %s, id: %"PRIx64", frameperiod: %d/%d\n", |
| 704 | standard.name, (uint64_t)standard.id, tpf->numerator, tpf->denominator); |
| 705 | break; |
| 706 | } |
| 707 | } |
| 708 | } else { |
| 709 | tpf = &streamparm.parm.capture.timeperframe; |
| 710 | } |
| 711 | |
| 712 | streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| 713 | if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) < 0) { |
| 714 | ret = AVERROR(errno); |
| 715 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n", av_err2str(ret)); |
| 716 | return ret; |
| 717 | } |
| 718 | |
| 719 | if (framerate_q.num && framerate_q.den) { |
| 720 | if (streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) { |
| 721 | tpf = &streamparm.parm.capture.timeperframe; |
| 722 | |
| 723 | av_log(ctx, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n", |
| 724 | framerate_q.den, framerate_q.num); |
| 725 | tpf->numerator = framerate_q.den; |
| 726 | tpf->denominator = framerate_q.num; |
| 727 | |
| 728 | if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) < 0) { |
| 729 | ret = AVERROR(errno); |
| 730 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_PARM): %s\n", av_err2str(ret)); |
| 731 | return ret; |
| 732 | } |
| 733 | |
| 734 | if (framerate_q.num != tpf->denominator || |
| 735 | framerate_q.den != tpf->numerator) { |
| 736 | av_log(ctx, AV_LOG_INFO, |
| 737 | "The driver changed the time per frame from " |
| 738 | "%d/%d to %d/%d\n", |
| 739 | framerate_q.den, framerate_q.num, |
| 740 | tpf->numerator, tpf->denominator); |
| 741 | } |
| 742 | } else { |
| 743 | av_log(ctx, AV_LOG_WARNING, |
| 744 | "The driver does not allow to change time per frame\n"); |
| 745 | } |
| 746 | } |
| 747 | if (tpf->denominator > 0 && tpf->numerator > 0) { |
| 748 | ctx->streams[0]->avg_frame_rate.num = tpf->denominator; |
| 749 | ctx->streams[0]->avg_frame_rate.den = tpf->numerator; |
| 750 | ctx->streams[0]->r_frame_rate = ctx->streams[0]->avg_frame_rate; |
| 751 | } else |
| 752 | av_log(ctx, AV_LOG_WARNING, "Time per frame unknown\n"); |
| 753 | |
| 754 | return 0; |
| 755 | } |
| 756 | |
| 757 | static int device_try_init(AVFormatContext *ctx, |
| 758 | enum AVPixelFormat pix_fmt, |
| 759 | int *width, |
| 760 | int *height, |
| 761 | uint32_t *desired_format, |
| 762 | enum AVCodecID *codec_id) |
| 763 | { |
| 764 | int ret, i; |
| 765 | |
| 766 | *desired_format = avpriv_fmt_ff2v4l(pix_fmt, ctx->video_codec_id); |
| 767 | |
| 768 | if (*desired_format) { |
| 769 | ret = device_init(ctx, width, height, *desired_format); |
| 770 | if (ret < 0) { |
| 771 | *desired_format = 0; |
| 772 | if (ret != AVERROR(EINVAL)) |
| 773 | return ret; |
| 774 | } |
| 775 | } |
| 776 | |
| 777 | if (!*desired_format) { |
| 778 | for (i = 0; avpriv_fmt_conversion_table[i].codec_id != AV_CODEC_ID_NONE; i++) { |
| 779 | if (ctx->video_codec_id == AV_CODEC_ID_NONE || |
| 780 | avpriv_fmt_conversion_table[i].codec_id == ctx->video_codec_id) { |
| 781 | av_log(ctx, AV_LOG_DEBUG, "Trying to set codec:%s pix_fmt:%s\n", |
| 782 | avcodec_get_name(avpriv_fmt_conversion_table[i].codec_id), |
| 783 | (char *)av_x_if_null(av_get_pix_fmt_name(avpriv_fmt_conversion_table[i].ff_fmt), "none")); |
| 784 | |
| 785 | *desired_format = avpriv_fmt_conversion_table[i].v4l2_fmt; |
| 786 | ret = device_init(ctx, width, height, *desired_format); |
| 787 | if (ret >= 0) |
| 788 | break; |
| 789 | else if (ret != AVERROR(EINVAL)) |
| 790 | return ret; |
| 791 | *desired_format = 0; |
| 792 | } |
| 793 | } |
| 794 | |
| 795 | if (*desired_format == 0) { |
| 796 | av_log(ctx, AV_LOG_ERROR, "Cannot find a proper format for " |
| 797 | "codec '%s' (id %d), pixel format '%s' (id %d)\n", |
| 798 | avcodec_get_name(ctx->video_codec_id), ctx->video_codec_id, |
| 799 | (char *)av_x_if_null(av_get_pix_fmt_name(pix_fmt), "none"), pix_fmt); |
| 800 | ret = AVERROR(EINVAL); |
| 801 | } |
| 802 | } |
| 803 | |
| 804 | *codec_id = avpriv_fmt_v4l2codec(*desired_format); |
| 805 | av_assert0(*codec_id != AV_CODEC_ID_NONE); |
| 806 | return ret; |
| 807 | } |
| 808 | |
| 809 | static int v4l2_read_header(AVFormatContext *ctx) |
| 810 | { |
| 811 | struct video_data *s = ctx->priv_data; |
| 812 | AVStream *st; |
| 813 | int res = 0; |
| 814 | uint32_t desired_format; |
| 815 | enum AVCodecID codec_id = AV_CODEC_ID_NONE; |
| 816 | enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE; |
| 817 | struct v4l2_input input = { 0 }; |
| 818 | |
| 819 | st = avformat_new_stream(ctx, NULL); |
| 820 | if (!st) |
| 821 | return AVERROR(ENOMEM); |
| 822 | |
| 823 | #if CONFIG_LIBV4L2 |
| 824 | /* silence libv4l2 logging. if fopen() fails v4l2_log_file will be NULL |
| 825 | and errors will get sent to stderr */ |
| 826 | if (s->use_libv4l2) |
| 827 | v4l2_log_file = fopen("/dev/null", "w"); |
| 828 | #endif |
| 829 | |
| 830 | s->fd = device_open(ctx); |
| 831 | if (s->fd < 0) |
| 832 | return s->fd; |
| 833 | |
| 834 | if (s->channel != -1) { |
| 835 | /* set video input */ |
| 836 | av_log(ctx, AV_LOG_DEBUG, "Selecting input_channel: %d\n", s->channel); |
| 837 | if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &s->channel) < 0) { |
| 838 | res = AVERROR(errno); |
| 839 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_INPUT): %s\n", av_err2str(res)); |
| 840 | goto fail; |
| 841 | } |
| 842 | } else { |
| 843 | /* get current video input */ |
| 844 | if (v4l2_ioctl(s->fd, VIDIOC_G_INPUT, &s->channel) < 0) { |
| 845 | res = AVERROR(errno); |
| 846 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_G_INPUT): %s\n", av_err2str(res)); |
| 847 | goto fail; |
| 848 | } |
| 849 | } |
| 850 | |
| 851 | /* enum input */ |
| 852 | input.index = s->channel; |
| 853 | if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) { |
| 854 | res = AVERROR(errno); |
| 855 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMINPUT): %s\n", av_err2str(res)); |
| 856 | goto fail; |
| 857 | } |
| 858 | s->std_id = input.std; |
| 859 | av_log(ctx, AV_LOG_DEBUG, "Current input_channel: %d, input_name: %s, input_std: %"PRIx64"\n", |
| 860 | s->channel, input.name, (uint64_t)input.std); |
| 861 | |
| 862 | if (s->list_format) { |
| 863 | list_formats(ctx, s->list_format); |
| 864 | res = AVERROR_EXIT; |
| 865 | goto fail; |
| 866 | } |
| 867 | |
| 868 | if (s->list_standard) { |
| 869 | list_standards(ctx); |
| 870 | res = AVERROR_EXIT; |
| 871 | goto fail; |
| 872 | } |
| 873 | |
| 874 | avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ |
| 875 | |
| 876 | if ((res = v4l2_set_parameters(ctx)) < 0) |
| 877 | goto fail; |
| 878 | |
| 879 | if (s->pixel_format) { |
| 880 | AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format); |
| 881 | |
| 882 | if (codec) |
| 883 | ctx->video_codec_id = codec->id; |
| 884 | |
| 885 | pix_fmt = av_get_pix_fmt(s->pixel_format); |
| 886 | |
| 887 | if (pix_fmt == AV_PIX_FMT_NONE && !codec) { |
| 888 | av_log(ctx, AV_LOG_ERROR, "No such input format: %s.\n", |
| 889 | s->pixel_format); |
| 890 | |
| 891 | res = AVERROR(EINVAL); |
| 892 | goto fail; |
| 893 | } |
| 894 | } |
| 895 | |
| 896 | if (!s->width && !s->height) { |
| 897 | struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE }; |
| 898 | |
| 899 | av_log(ctx, AV_LOG_VERBOSE, |
| 900 | "Querying the device for the current frame size\n"); |
| 901 | if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) { |
| 902 | res = AVERROR(errno); |
| 903 | av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res)); |
| 904 | goto fail; |
| 905 | } |
| 906 | |
| 907 | s->width = fmt.fmt.pix.width; |
| 908 | s->height = fmt.fmt.pix.height; |
| 909 | av_log(ctx, AV_LOG_VERBOSE, |
| 910 | "Setting frame size to %dx%d\n", s->width, s->height); |
| 911 | } |
| 912 | |
| 913 | res = device_try_init(ctx, pix_fmt, &s->width, &s->height, &desired_format, &codec_id); |
| 914 | if (res < 0) |
| 915 | goto fail; |
| 916 | |
| 917 | /* If no pixel_format was specified, the codec_id was not known up |
| 918 | * until now. Set video_codec_id in the context, as codec_id will |
| 919 | * not be available outside this function |
| 920 | */ |
| 921 | if (codec_id != AV_CODEC_ID_NONE && ctx->video_codec_id == AV_CODEC_ID_NONE) |
| 922 | ctx->video_codec_id = codec_id; |
| 923 | |
| 924 | if ((res = av_image_check_size(s->width, s->height, 0, ctx)) < 0) |
| 925 | goto fail; |
| 926 | |
| 927 | s->frame_format = desired_format; |
| 928 | |
| 929 | st->codec->pix_fmt = avpriv_fmt_v4l2ff(desired_format, codec_id); |
| 930 | s->frame_size = |
| 931 | avpicture_get_size(st->codec->pix_fmt, s->width, s->height); |
| 932 | |
| 933 | if ((res = mmap_init(ctx)) || |
| 934 | (res = mmap_start(ctx)) < 0) |
| 935 | goto fail; |
| 936 | |
| 937 | s->top_field_first = first_field(s); |
| 938 | |
| 939 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 940 | st->codec->codec_id = codec_id; |
| 941 | if (codec_id == AV_CODEC_ID_RAWVIDEO) |
| 942 | st->codec->codec_tag = |
| 943 | avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt); |
| 944 | else if (codec_id == AV_CODEC_ID_H264) { |
| 945 | st->need_parsing = AVSTREAM_PARSE_HEADERS; |
| 946 | } |
| 947 | if (desired_format == V4L2_PIX_FMT_YVU420) |
| 948 | st->codec->codec_tag = MKTAG('Y', 'V', '1', '2'); |
| 949 | else if (desired_format == V4L2_PIX_FMT_YVU410) |
| 950 | st->codec->codec_tag = MKTAG('Y', 'V', 'U', '9'); |
| 951 | st->codec->width = s->width; |
| 952 | st->codec->height = s->height; |
| 953 | if (st->avg_frame_rate.den) |
| 954 | st->codec->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8; |
| 955 | |
| 956 | return 0; |
| 957 | |
| 958 | fail: |
| 959 | v4l2_close(s->fd); |
| 960 | return res; |
| 961 | } |
| 962 | |
| 963 | static int v4l2_read_packet(AVFormatContext *ctx, AVPacket *pkt) |
| 964 | { |
| 965 | struct video_data *s = ctx->priv_data; |
| 966 | AVFrame *frame = ctx->streams[0]->codec->coded_frame; |
| 967 | int res; |
| 968 | |
| 969 | av_init_packet(pkt); |
| 970 | if ((res = mmap_read_frame(ctx, pkt)) < 0) { |
| 971 | return res; |
| 972 | } |
| 973 | |
| 974 | if (frame && s->interlaced) { |
| 975 | frame->interlaced_frame = 1; |
| 976 | frame->top_field_first = s->top_field_first; |
| 977 | } |
| 978 | |
| 979 | return pkt->size; |
| 980 | } |
| 981 | |
| 982 | static int v4l2_read_close(AVFormatContext *ctx) |
| 983 | { |
| 984 | struct video_data *s = ctx->priv_data; |
| 985 | |
| 986 | if (avpriv_atomic_int_get(&s->buffers_queued) != s->buffers) |
| 987 | av_log(ctx, AV_LOG_WARNING, "Some buffers are still owned by the caller on " |
| 988 | "close.\n"); |
| 989 | |
| 990 | mmap_close(s); |
| 991 | |
| 992 | v4l2_close(s->fd); |
| 993 | return 0; |
| 994 | } |
| 995 | |
| 996 | #define OFFSET(x) offsetof(struct video_data, x) |
| 997 | #define DEC AV_OPT_FLAG_DECODING_PARAM |
| 998 | |
| 999 | static const AVOption options[] = { |
| 1000 | { "standard", "set TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC }, |
| 1001 | { "channel", "set TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, INT_MAX, DEC }, |
| 1002 | { "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC }, |
| 1003 | { "pixel_format", "set preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
| 1004 | { "input_format", "set preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
| 1005 | { "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
| 1006 | |
| 1007 | { "list_formats", "list available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC, "list_formats" }, |
| 1008 | { "all", "show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" }, |
| 1009 | { "raw", "show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" }, |
| 1010 | { "compressed", "show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" }, |
| 1011 | |
| 1012 | { "list_standards", "list supported standards and exit", OFFSET(list_standard), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC, "list_standards" }, |
| 1013 | { "all", "show all supported standards", OFFSET(list_standard), AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, DEC, "list_standards" }, |
| 1014 | |
| 1015 | { "timestamps", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, "timestamps" }, |
| 1016 | { "ts", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, "timestamps" }, |
| 1017 | { "default", "use timestamps from the kernel", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_DEFAULT }, 0, 2, DEC, "timestamps" }, |
| 1018 | { "abs", "use absolute timestamps (wall clock)", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_ABS }, 0, 2, DEC, "timestamps" }, |
| 1019 | { "mono2abs", "force conversion from monotonic to absolute timestamps", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_MONO2ABS }, 0, 2, DEC, "timestamps" }, |
| 1020 | { "use_libv4l2", "use libv4l2 (v4l-utils) conversion functions", OFFSET(use_libv4l2), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC }, |
| 1021 | { NULL }, |
| 1022 | }; |
| 1023 | |
| 1024 | static const AVClass v4l2_class = { |
| 1025 | .class_name = "V4L2 indev", |
| 1026 | .item_name = av_default_item_name, |
| 1027 | .option = options, |
| 1028 | .version = LIBAVUTIL_VERSION_INT, |
| 1029 | .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT, |
| 1030 | }; |
| 1031 | |
| 1032 | AVInputFormat ff_v4l2_demuxer = { |
| 1033 | .name = "video4linux2,v4l2", |
| 1034 | .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"), |
| 1035 | .priv_data_size = sizeof(struct video_data), |
| 1036 | .read_header = v4l2_read_header, |
| 1037 | .read_packet = v4l2_read_packet, |
| 1038 | .read_close = v4l2_read_close, |
| 1039 | .flags = AVFMT_NOFILE, |
| 1040 | .priv_class = &v4l2_class, |
| 1041 | }; |