h264_metadata: Add option to delete filler data
[libav.git] / libavdevice / v4l2.c
1 /*
2 * Video4Linux2 grab interface
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2006 Luca Abeni
5 *
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 AV_PIX_FMT_*
11 *
12 *
13 * This file is part of Libav.
14 *
15 * Libav is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU Lesser General Public
17 * License as published by the Free Software Foundation; either
18 * version 2.1 of the License, or (at your option) any later version.
19 *
20 * Libav is distributed in the hope that it will be useful,
21 * 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 * License along with Libav; if not, write to the Free Software
27 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 */
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"
34 #include <unistd.h>
35 #include <fcntl.h>
36 #include <stdatomic.h>
37 #include <sys/ioctl.h>
38 #include <sys/mman.h>
39 #include <sys/time.h>
40 #include <poll.h>
41 #if HAVE_SYS_VIDEOIO_H
42 #include <sys/videoio.h>
43 #else
44 #include <linux/videodev2.h>
45 #endif
46 #include "libavutil/avassert.h"
47 #include "libavutil/imgutils.h"
48 #include "libavutil/internal.h"
49 #include "libavutil/log.h"
50 #include "libavutil/opt.h"
51 #include "libavutil/parseutils.h"
52 #include "libavutil/pixdesc.h"
53 #include "libavutil/avstring.h"
54 #include "libavutil/mathematics.h"
55
56 static const int desired_video_buffers = 256;
57
58 #define V4L_ALLFORMATS 3
59 #define V4L_RAWFORMATS 1
60 #define V4L_COMPFORMATS 2
61
62 struct video_data {
63 AVClass *class;
64 int fd;
65 int frame_format; /* V4L2_PIX_FMT_* */
66 int width, height;
67 int frame_size;
68 int timeout;
69 int interlaced;
70 int top_field_first;
71
72 int buffers;
73 atomic_int buffers_queued;
74 void **buf_start;
75 unsigned int *buf_len;
76 char *standard;
77 int channel;
78 char *video_size; /**< String describing video size,
79 set by a private option. */
80 char *pixel_format; /**< Set by a private option. */
81 int list_format; /**< Set by a private option. */
82 char *framerate; /**< Set by a private option. */
83 };
84
85 struct buff_data {
86 struct video_data *s;
87 int index;
88 int fd;
89 };
90
91 struct fmt_map {
92 enum AVPixelFormat ff_fmt;
93 enum AVCodecID codec_id;
94 uint32_t v4l2_fmt;
95 };
96
97 static struct fmt_map fmt_conversion_table[] = {
98 //ff_fmt codec_id v4l2_fmt
99 { AV_PIX_FMT_YUV420P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV420 },
100 { AV_PIX_FMT_YUV422P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV422P },
101 { AV_PIX_FMT_YUYV422, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUYV },
102 { AV_PIX_FMT_UYVY422, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_UYVY },
103 { AV_PIX_FMT_YUV411P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV411P },
104 { AV_PIX_FMT_YUV410P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV410 },
105 { AV_PIX_FMT_RGB555, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555 },
106 { AV_PIX_FMT_RGB565, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565 },
107 { AV_PIX_FMT_BGR24, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR24 },
108 { AV_PIX_FMT_RGB24, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB24 },
109 { AV_PIX_FMT_BGRA, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32 },
110 { AV_PIX_FMT_GRAY8, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY },
111 { AV_PIX_FMT_NV12, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_NV12 },
112 { AV_PIX_FMT_NONE, AV_CODEC_ID_MJPEG, V4L2_PIX_FMT_MJPEG },
113 { AV_PIX_FMT_NONE, AV_CODEC_ID_MJPEG, V4L2_PIX_FMT_JPEG },
114 #ifdef V4L2_PIX_FMT_H264
115 { AV_PIX_FMT_NONE, AV_CODEC_ID_H264, V4L2_PIX_FMT_H264 },
116 #endif
117 };
118
119 static int device_open(AVFormatContext *ctx)
120 {
121 struct v4l2_capability cap;
122 int fd;
123 int res, err;
124 int flags = O_RDWR;
125 char errbuf[128];
126
127 if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
128 flags |= O_NONBLOCK;
129 }
130
131 fd = avpriv_open(ctx->filename, flags);
132 if (fd < 0) {
133 err = AVERROR(errno);
134 av_strerror(err, errbuf, sizeof(errbuf));
135
136 av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
137 ctx->filename, errbuf);
138
139 return err;
140 }
141
142 res = ioctl(fd, VIDIOC_QUERYCAP, &cap);
143 if (res < 0) {
144 err = AVERROR(errno);
145 av_strerror(err, errbuf, sizeof(errbuf));
146 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
147 errbuf);
148
149 goto fail;
150 }
151
152 av_log(ctx, AV_LOG_VERBOSE, "[%d]Capabilities: %x\n",
153 fd, cap.capabilities);
154
155 if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
156 av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
157 err = AVERROR(ENODEV);
158
159 goto fail;
160 }
161
162 if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
163 av_log(ctx, AV_LOG_ERROR,
164 "The device does not support the streaming I/O method.\n");
165 err = AVERROR(ENOSYS);
166
167 goto fail;
168 }
169
170 return fd;
171
172 fail:
173 close(fd);
174 return err;
175 }
176
177 static int device_init(AVFormatContext *ctx, int *width, int *height,
178 uint32_t pix_fmt)
179 {
180 struct video_data *s = ctx->priv_data;
181 int fd = s->fd;
182 struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
183 struct v4l2_pix_format *pix = &fmt.fmt.pix;
184
185 int res;
186
187 pix->width = *width;
188 pix->height = *height;
189 pix->pixelformat = pix_fmt;
190 pix->field = V4L2_FIELD_ANY;
191
192 res = ioctl(fd, VIDIOC_S_FMT, &fmt);
193
194 if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
195 av_log(ctx, AV_LOG_INFO,
196 "The V4L2 driver changed the video from %dx%d to %dx%d\n",
197 *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
198 *width = fmt.fmt.pix.width;
199 *height = fmt.fmt.pix.height;
200 }
201
202 if (pix_fmt != fmt.fmt.pix.pixelformat) {
203 av_log(ctx, AV_LOG_DEBUG,
204 "The V4L2 driver changed the pixel format "
205 "from 0x%08X to 0x%08X\n",
206 pix_fmt, fmt.fmt.pix.pixelformat);
207 res = -1;
208 }
209
210 if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
211 av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver using the interlaced mode");
212 s->interlaced = 1;
213 }
214
215 return res;
216 }
217
218 static int first_field(int fd)
219 {
220 int res;
221 v4l2_std_id std;
222
223 res = ioctl(fd, VIDIOC_G_STD, &std);
224 if (res < 0) {
225 return 0;
226 }
227 if (std & V4L2_STD_NTSC) {
228 return 0;
229 }
230
231 return 1;
232 }
233
234 static uint32_t fmt_ff2v4l(enum AVPixelFormat pix_fmt, enum AVCodecID codec_id)
235 {
236 int i;
237
238 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
239 if ((codec_id == AV_CODEC_ID_NONE ||
240 fmt_conversion_table[i].codec_id == codec_id) &&
241 (pix_fmt == AV_PIX_FMT_NONE ||
242 fmt_conversion_table[i].ff_fmt == pix_fmt)) {
243 return fmt_conversion_table[i].v4l2_fmt;
244 }
245 }
246
247 return 0;
248 }
249
250 static enum AVPixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum AVCodecID codec_id)
251 {
252 int i;
253
254 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
255 if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt &&
256 fmt_conversion_table[i].codec_id == codec_id) {
257 return fmt_conversion_table[i].ff_fmt;
258 }
259 }
260
261 return AV_PIX_FMT_NONE;
262 }
263
264 static enum AVCodecID fmt_v4l2codec(uint32_t v4l2_fmt)
265 {
266 int i;
267
268 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
269 if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt) {
270 return fmt_conversion_table[i].codec_id;
271 }
272 }
273
274 return AV_CODEC_ID_NONE;
275 }
276
277 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
278 static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat)
279 {
280 struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
281
282 while(!ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
283 switch (vfse.type) {
284 case V4L2_FRMSIZE_TYPE_DISCRETE:
285 av_log(ctx, AV_LOG_INFO, " %ux%u",
286 vfse.discrete.width, vfse.discrete.height);
287 break;
288 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
289 case V4L2_FRMSIZE_TYPE_STEPWISE:
290 av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
291 vfse.stepwise.min_width,
292 vfse.stepwise.max_width,
293 vfse.stepwise.step_width,
294 vfse.stepwise.min_height,
295 vfse.stepwise.max_height,
296 vfse.stepwise.step_height);
297 }
298 vfse.index++;
299 }
300 }
301 #endif
302
303 static void list_formats(AVFormatContext *ctx, int fd, int type)
304 {
305 struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
306
307 while(!ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) {
308 enum AVCodecID codec_id = fmt_v4l2codec(vfd.pixelformat);
309 enum AVPixelFormat pix_fmt = fmt_v4l2ff(vfd.pixelformat, codec_id);
310
311 vfd.index++;
312
313 if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
314 type & V4L_RAWFORMATS) {
315 const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
316 av_log(ctx, AV_LOG_INFO, "R : %9s : %20s :",
317 fmt_name ? fmt_name : "Unsupported",
318 vfd.description);
319 } else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
320 type & V4L_COMPFORMATS) {
321 const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);
322 av_log(ctx, AV_LOG_INFO, "C : %9s : %20s :",
323 desc ? desc->name : "Unsupported",
324 vfd.description);
325 } else {
326 continue;
327 }
328
329 #ifdef V4L2_FMT_FLAG_EMULATED
330 if (vfd.flags & V4L2_FMT_FLAG_EMULATED) {
331 av_log(ctx, AV_LOG_WARNING, "%s", "Emulated");
332 continue;
333 }
334 #endif
335 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
336 list_framesizes(ctx, fd, vfd.pixelformat);
337 #endif
338 av_log(ctx, AV_LOG_INFO, "\n");
339 }
340 }
341
342 static int mmap_init(AVFormatContext *ctx)
343 {
344 int i, res;
345 struct video_data *s = ctx->priv_data;
346 struct v4l2_requestbuffers req = {
347 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
348 .count = desired_video_buffers,
349 .memory = V4L2_MEMORY_MMAP
350 };
351
352 res = ioctl(s->fd, VIDIOC_REQBUFS, &req);
353 if (res < 0) {
354 res = AVERROR(errno);
355 if (res == AVERROR(EINVAL)) {
356 av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n");
357 } else {
358 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n");
359 }
360
361 return res;
362 }
363
364 if (req.count < 2) {
365 av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
366
367 return AVERROR(ENOMEM);
368 }
369 s->buffers = req.count;
370 s->buf_start = av_malloc(sizeof(void *) * s->buffers);
371 if (!s->buf_start) {
372 av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
373
374 return AVERROR(ENOMEM);
375 }
376 s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
377 if (!s->buf_len) {
378 av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
379 av_free(s->buf_start);
380
381 return AVERROR(ENOMEM);
382 }
383
384 for (i = 0; i < req.count; i++) {
385 struct v4l2_buffer buf = {
386 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
387 .index = i,
388 .memory = V4L2_MEMORY_MMAP
389 };
390
391 res = ioctl(s->fd, VIDIOC_QUERYBUF, &buf);
392 if (res < 0) {
393 res = AVERROR(errno);
394 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
395
396 return res;
397 }
398
399 s->buf_len[i] = buf.length;
400 if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
401 av_log(ctx, AV_LOG_ERROR,
402 "Buffer len [%d] = %d != %d\n",
403 i, s->buf_len[i], s->frame_size);
404
405 return -1;
406 }
407 s->buf_start[i] = mmap(NULL, buf.length,
408 PROT_READ | PROT_WRITE, MAP_SHARED,
409 s->fd, buf.m.offset);
410
411 if (s->buf_start[i] == MAP_FAILED) {
412 char errbuf[128];
413 res = AVERROR(errno);
414 av_strerror(res, errbuf, sizeof(errbuf));
415 av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", errbuf);
416
417 return res;
418 }
419 }
420
421 return 0;
422 }
423
424 static void mmap_release_buffer(void *opaque, uint8_t *data)
425 {
426 struct v4l2_buffer buf = { 0 };
427 int res, fd;
428 struct buff_data *buf_descriptor = opaque;
429 struct video_data *s = buf_descriptor->s;
430 char errbuf[128];
431
432 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
433 buf.memory = V4L2_MEMORY_MMAP;
434 buf.index = buf_descriptor->index;
435 fd = buf_descriptor->fd;
436 av_free(buf_descriptor);
437
438 res = ioctl(fd, VIDIOC_QBUF, &buf);
439 if (res < 0) {
440 av_strerror(AVERROR(errno), errbuf, sizeof(errbuf));
441 av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
442 errbuf);
443 }
444 atomic_fetch_add(&s->buffers_queued, 1);
445 }
446
447 static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
448 {
449 struct video_data *s = ctx->priv_data;
450 struct v4l2_buffer buf = {
451 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
452 .memory = V4L2_MEMORY_MMAP
453 };
454 struct pollfd p = { .fd = s->fd, .events = POLLIN };
455 int res;
456
457 res = poll(&p, 1, s->timeout);
458 if (res < 0)
459 return AVERROR(errno);
460
461 if (!(p.revents & (POLLIN | POLLERR | POLLHUP)))
462 return AVERROR(EAGAIN);
463
464 /* FIXME: Some special treatment might be needed in case of loss of signal... */
465 while ((res = ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
466 if (res < 0) {
467 char errbuf[128];
468 if (errno == EAGAIN) {
469 pkt->size = 0;
470
471 return AVERROR(EAGAIN);
472 }
473 res = AVERROR(errno);
474 av_strerror(res, errbuf, sizeof(errbuf));
475 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
476 errbuf);
477
478 return res;
479 }
480
481 if (buf.index >= s->buffers) {
482 av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n");
483 return AVERROR(EINVAL);
484 }
485 atomic_fetch_add(&s->buffers_queued, -1);
486 // always keep at least one buffer queued
487 av_assert0(atomic_load(&s->buffers_queued) >= 1);
488
489 if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
490 av_log(ctx, AV_LOG_ERROR,
491 "The v4l2 frame is %d bytes, but %d bytes are expected\n",
492 buf.bytesused, s->frame_size);
493
494 return AVERROR_INVALIDDATA;
495 }
496
497 /* Image is at s->buff_start[buf.index] */
498 if (atomic_load(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) {
499 /* when we start getting low on queued buffers, fall back on copying data */
500 res = av_new_packet(pkt, buf.bytesused);
501 if (res < 0) {
502 av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n");
503 return res;
504 }
505 memcpy(pkt->data, s->buf_start[buf.index], buf.bytesused);
506
507 res = ioctl(s->fd, VIDIOC_QBUF, &buf);
508 if (res < 0) {
509 res = AVERROR(errno);
510 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n");
511 av_packet_unref(pkt);
512 return res;
513 }
514 atomic_fetch_add(&s->buffers_queued, 1);
515 } else {
516 struct buff_data *buf_descriptor;
517
518 pkt->data = s->buf_start[buf.index];
519 pkt->size = buf.bytesused;
520
521 buf_descriptor = av_malloc(sizeof(struct buff_data));
522 if (!buf_descriptor) {
523 /* Something went wrong... Since av_malloc() failed, we cannot even
524 * allocate a buffer for memcpying into it
525 */
526 av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
527 res = ioctl(s->fd, VIDIOC_QBUF, &buf);
528
529 return AVERROR(ENOMEM);
530 }
531 buf_descriptor->fd = s->fd;
532 buf_descriptor->index = buf.index;
533 buf_descriptor->s = s;
534
535 pkt->buf = av_buffer_create(pkt->data, pkt->size, mmap_release_buffer,
536 buf_descriptor, 0);
537 if (!pkt->buf) {
538 av_freep(&buf_descriptor);
539 return AVERROR(ENOMEM);
540 }
541 }
542 pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
543
544 return s->buf_len[buf.index];
545 }
546
547 static int mmap_start(AVFormatContext *ctx)
548 {
549 struct video_data *s = ctx->priv_data;
550 enum v4l2_buf_type type;
551 int i, res, err;
552 char errbuf[128];
553
554 for (i = 0; i < s->buffers; i++) {
555 struct v4l2_buffer buf = {
556 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
557 .index = i,
558 .memory = V4L2_MEMORY_MMAP
559 };
560
561 res = ioctl(s->fd, VIDIOC_QBUF, &buf);
562 if (res < 0) {
563 err = AVERROR(errno);
564 av_strerror(err, errbuf, sizeof(errbuf));
565 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
566 errbuf);
567
568 return err;
569 }
570 }
571 atomic_store(&s->buffers_queued, s->buffers);
572
573 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
574 res = ioctl(s->fd, VIDIOC_STREAMON, &type);
575 if (res < 0) {
576 err = AVERROR(errno);
577 av_strerror(err, errbuf, sizeof(errbuf));
578 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
579 errbuf);
580
581 return err;
582 }
583
584 return 0;
585 }
586
587 static void mmap_close(struct video_data *s)
588 {
589 enum v4l2_buf_type type;
590 int i;
591
592 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
593 /* We do not check for the result, because we could
594 * not do anything about it anyway...
595 */
596 ioctl(s->fd, VIDIOC_STREAMOFF, &type);
597 for (i = 0; i < s->buffers; i++) {
598 munmap(s->buf_start[i], s->buf_len[i]);
599 }
600 av_free(s->buf_start);
601 av_free(s->buf_len);
602 }
603
604 static int v4l2_set_parameters(AVFormatContext *s1)
605 {
606 struct video_data *s = s1->priv_data;
607 struct v4l2_input input = { 0 };
608 struct v4l2_standard standard = { 0 };
609 struct v4l2_streamparm streamparm = { 0 };
610 struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe;
611 AVRational framerate_q = { 0 };
612 int i, ret;
613
614 streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
615
616 if (s->framerate &&
617 (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
618 av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
619 s->framerate);
620 return ret;
621 }
622
623 /* set tv video input */
624 input.index = s->channel;
625 if (ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
626 av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n");
627 return AVERROR(EIO);
628 }
629
630 av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n",
631 s->channel, input.name);
632 if (ioctl(s->fd, VIDIOC_S_INPUT, &input.index) < 0) {
633 av_log(s1, AV_LOG_ERROR,
634 "The V4L2 driver ioctl set input(%d) failed\n",
635 s->channel);
636 return AVERROR(EIO);
637 }
638
639 if (s->standard) {
640 av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
641 s->standard);
642 /* set tv standard */
643 for(i=0;;i++) {
644 standard.index = i;
645 if (ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
646 av_log(s1, AV_LOG_ERROR,
647 "The V4L2 driver ioctl set standard(%s) failed\n",
648 s->standard);
649 return AVERROR(EIO);
650 }
651
652 if (!av_strcasecmp(standard.name, s->standard)) {
653 break;
654 }
655 }
656
657 av_log(s1, AV_LOG_DEBUG,
658 "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
659 s->standard, (uint64_t)standard.id);
660 if (ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
661 av_log(s1, AV_LOG_ERROR,
662 "The V4L2 driver ioctl set standard(%s) failed\n",
663 s->standard);
664 return AVERROR(EIO);
665 }
666 }
667
668 if (framerate_q.num && framerate_q.den) {
669 av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
670 framerate_q.den, framerate_q.num);
671 tpf->numerator = framerate_q.den;
672 tpf->denominator = framerate_q.num;
673
674 if (ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) {
675 av_log(s1, AV_LOG_ERROR,
676 "ioctl set time per frame(%d/%d) failed\n",
677 framerate_q.den, framerate_q.num);
678 return AVERROR(EIO);
679 }
680
681 if (framerate_q.num != tpf->denominator ||
682 framerate_q.den != tpf->numerator) {
683 av_log(s1, AV_LOG_INFO,
684 "The driver changed the time per frame from "
685 "%d/%d to %d/%d\n",
686 framerate_q.den, framerate_q.num,
687 tpf->numerator, tpf->denominator);
688 }
689 } else {
690 if (ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) {
691 char errbuf[128];
692 ret = AVERROR(errno);
693 av_strerror(ret, errbuf, sizeof(errbuf));
694 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n",
695 errbuf);
696 return ret;
697 }
698 }
699 s1->streams[0]->avg_frame_rate.num = tpf->denominator;
700 s1->streams[0]->avg_frame_rate.den = tpf->numerator;
701
702 s->timeout = 100 +
703 av_rescale_q(1, s1->streams[0]->avg_frame_rate,
704 (AVRational){1, 1000});
705
706 return 0;
707 }
708
709 static uint32_t device_try_init(AVFormatContext *s1,
710 enum AVPixelFormat pix_fmt,
711 int *width,
712 int *height,
713 enum AVCodecID *codec_id)
714 {
715 uint32_t desired_format = fmt_ff2v4l(pix_fmt, s1->video_codec_id);
716
717 if (desired_format == 0 ||
718 device_init(s1, width, height, desired_format) < 0) {
719 int i;
720
721 desired_format = 0;
722 for (i = 0; i<FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
723 if (s1->video_codec_id == AV_CODEC_ID_NONE ||
724 fmt_conversion_table[i].codec_id == s1->video_codec_id) {
725 desired_format = fmt_conversion_table[i].v4l2_fmt;
726 if (device_init(s1, width, height, desired_format) >= 0) {
727 break;
728 }
729 desired_format = 0;
730 }
731 }
732 }
733
734 if (desired_format != 0) {
735 *codec_id = fmt_v4l2codec(desired_format);
736 assert(*codec_id != AV_CODEC_ID_NONE);
737 }
738
739 return desired_format;
740 }
741
742 static int v4l2_read_header(AVFormatContext *s1)
743 {
744 struct video_data *s = s1->priv_data;
745 AVStream *st;
746 int res = 0;
747 uint32_t desired_format;
748 enum AVCodecID codec_id;
749 enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
750
751 st = avformat_new_stream(s1, NULL);
752 if (!st)
753 return AVERROR(ENOMEM);
754
755 s->fd = device_open(s1);
756 if (s->fd < 0)
757 return s->fd;
758
759 if (s->list_format) {
760 list_formats(s1, s->fd, s->list_format);
761 return AVERROR_EXIT;
762 }
763
764 avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
765
766 if (s->video_size &&
767 (res = av_parse_video_size(&s->width, &s->height, s->video_size)) < 0) {
768 av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n",
769 s->video_size);
770 return res;
771 }
772
773 if (s->pixel_format) {
774 const AVCodecDescriptor *desc = avcodec_descriptor_get_by_name(s->pixel_format);
775
776 if (desc) {
777 s1->video_codec_id = desc->id;
778 st->need_parsing = AVSTREAM_PARSE_HEADERS;
779 }
780
781 pix_fmt = av_get_pix_fmt(s->pixel_format);
782
783 if (pix_fmt == AV_PIX_FMT_NONE && !desc) {
784 av_log(s1, AV_LOG_ERROR, "No such input format: %s.\n",
785 s->pixel_format);
786
787 return AVERROR(EINVAL);
788 }
789 }
790
791 if (!s->width && !s->height) {
792 struct v4l2_format fmt;
793
794 av_log(s1, AV_LOG_VERBOSE,
795 "Querying the device for the current frame size\n");
796 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
797 if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
798 char errbuf[128];
799 res = AVERROR(errno);
800 av_strerror(res, errbuf, sizeof(errbuf));
801 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
802 errbuf);
803 return res;
804 }
805
806 s->width = fmt.fmt.pix.width;
807 s->height = fmt.fmt.pix.height;
808 av_log(s1, AV_LOG_VERBOSE,
809 "Setting frame size to %dx%d\n", s->width, s->height);
810 }
811
812 desired_format = device_try_init(s1, pix_fmt, &s->width, &s->height,
813 &codec_id);
814 if (desired_format == 0) {
815 av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for "
816 "codec_id %d, pix_fmt %d.\n", s1->video_codec_id, pix_fmt);
817 close(s->fd);
818
819 return AVERROR(EIO);
820 }
821
822 if ((res = av_image_check_size(s->width, s->height, 0, s1) < 0))
823 return res;
824
825 s->frame_format = desired_format;
826
827 if ((res = v4l2_set_parameters(s1) < 0))
828 return res;
829
830 st->codecpar->format = fmt_v4l2ff(desired_format, codec_id);
831 s->frame_size = av_image_get_buffer_size(st->codecpar->format,
832 s->width, s->height, 1);
833
834 if ((res = mmap_init(s1)) ||
835 (res = mmap_start(s1)) < 0) {
836 close(s->fd);
837 return res;
838 }
839
840 s->top_field_first = first_field(s->fd);
841
842 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
843 st->codecpar->codec_id = codec_id;
844 if (codec_id == AV_CODEC_ID_RAWVIDEO)
845 st->codecpar->codec_tag =
846 avcodec_pix_fmt_to_codec_tag(st->codecpar->format);
847 st->codecpar->width = s->width;
848 st->codecpar->height = s->height;
849 st->codecpar->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8;
850
851 return 0;
852 }
853
854 static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
855 {
856 #if FF_API_CODED_FRAME && FF_API_LAVF_AVCTX
857 FF_DISABLE_DEPRECATION_WARNINGS
858 struct video_data *s = s1->priv_data;
859 AVFrame *frame = s1->streams[0]->codec->coded_frame;
860 FF_ENABLE_DEPRECATION_WARNINGS
861 #endif
862 int res;
863
864 if ((res = mmap_read_frame(s1, pkt)) < 0) {
865 return res;
866 }
867
868 #if FF_API_CODED_FRAME && FF_API_LAVF_AVCTX
869 FF_DISABLE_DEPRECATION_WARNINGS
870 if (frame && s->interlaced) {
871 frame->interlaced_frame = 1;
872 frame->top_field_first = s->top_field_first;
873 }
874 FF_ENABLE_DEPRECATION_WARNINGS
875 #endif
876
877 return pkt->size;
878 }
879
880 static int v4l2_read_close(AVFormatContext *s1)
881 {
882 struct video_data *s = s1->priv_data;
883
884 if (atomic_load(&s->buffers_queued) != s->buffers)
885 av_log(s1, AV_LOG_WARNING, "Some buffers are still owned by the caller on "
886 "close.\n");
887
888 mmap_close(s);
889
890 close(s->fd);
891 return 0;
892 }
893
894 #define OFFSET(x) offsetof(struct video_data, x)
895 #define DEC AV_OPT_FLAG_DECODING_PARAM
896 static const AVOption options[] = {
897 { "standard", "TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
898 { "channel", "TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
899 { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
900 { "pixel_format", "Preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
901 { "input_format", "Preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
902 { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
903 { "list_formats", "List available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC, "list_formats" },
904 { "all", "Show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" },
905 { "raw", "Show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" },
906 { "compressed", "Show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" },
907 { NULL },
908 };
909
910 static const AVClass v4l2_class = {
911 .class_name = "V4L2 indev",
912 .item_name = av_default_item_name,
913 .option = options,
914 .version = LIBAVUTIL_VERSION_INT,
915 };
916
917 AVInputFormat ff_v4l2_demuxer = {
918 .name = "video4linux2",
919 .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
920 .priv_data_size = sizeof(struct video_data),
921 .read_header = v4l2_read_header,
922 .read_packet = v4l2_read_packet,
923 .read_close = v4l2_read_close,
924 .flags = AVFMT_NOFILE,
925 .priv_class = &v4l2_class,
926 };