v4l2: Add support for h264
[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 <sys/ioctl.h>
37 #include <sys/mman.h>
38 #include <sys/time.h>
39 #include <poll.h>
40 #if HAVE_SYS_VIDEOIO_H
41 #include <sys/videoio.h>
42 #else
43 #include <linux/videodev2.h>
44 #endif
45 #include "libavutil/atomic.h"
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 volatile 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 #if FF_API_DESTRUCT_PACKET
425 static void dummy_release_buffer(AVPacket *pkt)
426 {
427 av_assert0(0);
428 }
429 #endif
430
431 static void mmap_release_buffer(void *opaque, uint8_t *data)
432 {
433 struct v4l2_buffer buf = { 0 };
434 int res, fd;
435 struct buff_data *buf_descriptor = opaque;
436 struct video_data *s = buf_descriptor->s;
437 char errbuf[128];
438
439 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
440 buf.memory = V4L2_MEMORY_MMAP;
441 buf.index = buf_descriptor->index;
442 fd = buf_descriptor->fd;
443 av_free(buf_descriptor);
444
445 res = ioctl(fd, VIDIOC_QBUF, &buf);
446 if (res < 0) {
447 av_strerror(AVERROR(errno), errbuf, sizeof(errbuf));
448 av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
449 errbuf);
450 }
451 avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
452 }
453
454 static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
455 {
456 struct video_data *s = ctx->priv_data;
457 struct v4l2_buffer buf = {
458 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
459 .memory = V4L2_MEMORY_MMAP
460 };
461 struct pollfd p = { .fd = s->fd, .events = POLLIN };
462 int res;
463
464 res = poll(&p, 1, s->timeout);
465 if (res < 0)
466 return AVERROR(errno);
467
468 if (!(p.revents & (POLLIN | POLLERR | POLLHUP)))
469 return AVERROR(EAGAIN);
470
471 /* FIXME: Some special treatment might be needed in case of loss of signal... */
472 while ((res = ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
473 if (res < 0) {
474 char errbuf[128];
475 if (errno == EAGAIN) {
476 pkt->size = 0;
477
478 return AVERROR(EAGAIN);
479 }
480 res = AVERROR(errno);
481 av_strerror(res, errbuf, sizeof(errbuf));
482 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
483 errbuf);
484
485 return res;
486 }
487
488 if (buf.index >= s->buffers) {
489 av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n");
490 return AVERROR(EINVAL);
491 }
492 avpriv_atomic_int_add_and_fetch(&s->buffers_queued, -1);
493 // always keep at least one buffer queued
494 av_assert0(avpriv_atomic_int_get(&s->buffers_queued) >= 1);
495
496 if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
497 av_log(ctx, AV_LOG_ERROR,
498 "The v4l2 frame is %d bytes, but %d bytes are expected\n",
499 buf.bytesused, s->frame_size);
500
501 return AVERROR_INVALIDDATA;
502 }
503
504 /* Image is at s->buff_start[buf.index] */
505 if (avpriv_atomic_int_get(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) {
506 /* when we start getting low on queued buffers, fall back on copying data */
507 res = av_new_packet(pkt, buf.bytesused);
508 if (res < 0) {
509 av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n");
510 return res;
511 }
512 memcpy(pkt->data, s->buf_start[buf.index], buf.bytesused);
513
514 res = ioctl(s->fd, VIDIOC_QBUF, &buf);
515 if (res < 0) {
516 res = AVERROR(errno);
517 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n");
518 av_free_packet(pkt);
519 return res;
520 }
521 avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
522 } else {
523 struct buff_data *buf_descriptor;
524
525 pkt->data = s->buf_start[buf.index];
526 pkt->size = buf.bytesused;
527 #if FF_API_DESTRUCT_PACKET
528 FF_DISABLE_DEPRECATION_WARNINGS
529 pkt->destruct = dummy_release_buffer;
530 FF_ENABLE_DEPRECATION_WARNINGS
531 #endif
532
533 buf_descriptor = av_malloc(sizeof(struct buff_data));
534 if (!buf_descriptor) {
535 /* Something went wrong... Since av_malloc() failed, we cannot even
536 * allocate a buffer for memcpying into it
537 */
538 av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
539 res = ioctl(s->fd, VIDIOC_QBUF, &buf);
540
541 return AVERROR(ENOMEM);
542 }
543 buf_descriptor->fd = s->fd;
544 buf_descriptor->index = buf.index;
545 buf_descriptor->s = s;
546
547 pkt->buf = av_buffer_create(pkt->data, pkt->size, mmap_release_buffer,
548 buf_descriptor, 0);
549 if (!pkt->buf) {
550 av_freep(&buf_descriptor);
551 return AVERROR(ENOMEM);
552 }
553 }
554 pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
555
556 return s->buf_len[buf.index];
557 }
558
559 static int mmap_start(AVFormatContext *ctx)
560 {
561 struct video_data *s = ctx->priv_data;
562 enum v4l2_buf_type type;
563 int i, res, err;
564 char errbuf[128];
565
566 for (i = 0; i < s->buffers; i++) {
567 struct v4l2_buffer buf = {
568 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
569 .index = i,
570 .memory = V4L2_MEMORY_MMAP
571 };
572
573 res = ioctl(s->fd, VIDIOC_QBUF, &buf);
574 if (res < 0) {
575 err = AVERROR(errno);
576 av_strerror(err, errbuf, sizeof(errbuf));
577 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
578 errbuf);
579
580 return err;
581 }
582 }
583 s->buffers_queued = s->buffers;
584
585 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
586 res = ioctl(s->fd, VIDIOC_STREAMON, &type);
587 if (res < 0) {
588 err = AVERROR(errno);
589 av_strerror(err, errbuf, sizeof(errbuf));
590 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
591 errbuf);
592
593 return err;
594 }
595
596 return 0;
597 }
598
599 static void mmap_close(struct video_data *s)
600 {
601 enum v4l2_buf_type type;
602 int i;
603
604 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
605 /* We do not check for the result, because we could
606 * not do anything about it anyway...
607 */
608 ioctl(s->fd, VIDIOC_STREAMOFF, &type);
609 for (i = 0; i < s->buffers; i++) {
610 munmap(s->buf_start[i], s->buf_len[i]);
611 }
612 av_free(s->buf_start);
613 av_free(s->buf_len);
614 }
615
616 static int v4l2_set_parameters(AVFormatContext *s1)
617 {
618 struct video_data *s = s1->priv_data;
619 struct v4l2_input input = { 0 };
620 struct v4l2_standard standard = { 0 };
621 struct v4l2_streamparm streamparm = { 0 };
622 struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe;
623 AVRational framerate_q = { 0 };
624 int i, ret;
625
626 streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
627
628 if (s->framerate &&
629 (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
630 av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
631 s->framerate);
632 return ret;
633 }
634
635 /* set tv video input */
636 input.index = s->channel;
637 if (ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
638 av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n");
639 return AVERROR(EIO);
640 }
641
642 av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n",
643 s->channel, input.name);
644 if (ioctl(s->fd, VIDIOC_S_INPUT, &input.index) < 0) {
645 av_log(s1, AV_LOG_ERROR,
646 "The V4L2 driver ioctl set input(%d) failed\n",
647 s->channel);
648 return AVERROR(EIO);
649 }
650
651 if (s->standard) {
652 av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
653 s->standard);
654 /* set tv standard */
655 for(i=0;;i++) {
656 standard.index = i;
657 if (ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
658 av_log(s1, AV_LOG_ERROR,
659 "The V4L2 driver ioctl set standard(%s) failed\n",
660 s->standard);
661 return AVERROR(EIO);
662 }
663
664 if (!av_strcasecmp(standard.name, s->standard)) {
665 break;
666 }
667 }
668
669 av_log(s1, AV_LOG_DEBUG,
670 "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
671 s->standard, (uint64_t)standard.id);
672 if (ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
673 av_log(s1, AV_LOG_ERROR,
674 "The V4L2 driver ioctl set standard(%s) failed\n",
675 s->standard);
676 return AVERROR(EIO);
677 }
678 }
679
680 if (framerate_q.num && framerate_q.den) {
681 av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
682 framerate_q.den, framerate_q.num);
683 tpf->numerator = framerate_q.den;
684 tpf->denominator = framerate_q.num;
685
686 if (ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) {
687 av_log(s1, AV_LOG_ERROR,
688 "ioctl set time per frame(%d/%d) failed\n",
689 framerate_q.den, framerate_q.num);
690 return AVERROR(EIO);
691 }
692
693 if (framerate_q.num != tpf->denominator ||
694 framerate_q.den != tpf->numerator) {
695 av_log(s1, AV_LOG_INFO,
696 "The driver changed the time per frame from "
697 "%d/%d to %d/%d\n",
698 framerate_q.den, framerate_q.num,
699 tpf->numerator, tpf->denominator);
700 }
701 } else {
702 if (ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) {
703 char errbuf[128];
704 ret = AVERROR(errno);
705 av_strerror(ret, errbuf, sizeof(errbuf));
706 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n",
707 errbuf);
708 return ret;
709 }
710 }
711 s1->streams[0]->avg_frame_rate.num = tpf->denominator;
712 s1->streams[0]->avg_frame_rate.den = tpf->numerator;
713
714 s->timeout = 100 +
715 av_rescale_q(1, s1->streams[0]->avg_frame_rate,
716 (AVRational){1, 1000});
717
718 return 0;
719 }
720
721 static uint32_t device_try_init(AVFormatContext *s1,
722 enum AVPixelFormat pix_fmt,
723 int *width,
724 int *height,
725 enum AVCodecID *codec_id)
726 {
727 uint32_t desired_format = fmt_ff2v4l(pix_fmt, s1->video_codec_id);
728
729 if (desired_format == 0 ||
730 device_init(s1, width, height, desired_format) < 0) {
731 int i;
732
733 desired_format = 0;
734 for (i = 0; i<FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
735 if (s1->video_codec_id == AV_CODEC_ID_NONE ||
736 fmt_conversion_table[i].codec_id == s1->video_codec_id) {
737 desired_format = fmt_conversion_table[i].v4l2_fmt;
738 if (device_init(s1, width, height, desired_format) >= 0) {
739 break;
740 }
741 desired_format = 0;
742 }
743 }
744 }
745
746 if (desired_format != 0) {
747 *codec_id = fmt_v4l2codec(desired_format);
748 assert(*codec_id != AV_CODEC_ID_NONE);
749 }
750
751 return desired_format;
752 }
753
754 static int v4l2_read_header(AVFormatContext *s1)
755 {
756 struct video_data *s = s1->priv_data;
757 AVStream *st;
758 int res = 0;
759 uint32_t desired_format;
760 enum AVCodecID codec_id;
761 enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
762
763 st = avformat_new_stream(s1, NULL);
764 if (!st)
765 return AVERROR(ENOMEM);
766
767 s->fd = device_open(s1);
768 if (s->fd < 0)
769 return s->fd;
770
771 if (s->list_format) {
772 list_formats(s1, s->fd, s->list_format);
773 return AVERROR_EXIT;
774 }
775
776 avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
777
778 if (s->video_size &&
779 (res = av_parse_video_size(&s->width, &s->height, s->video_size)) < 0) {
780 av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n",
781 s->video_size);
782 return res;
783 }
784
785 if (s->pixel_format) {
786 AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format);
787
788 if (codec) {
789 s1->video_codec_id = codec->id;
790 st->need_parsing = AVSTREAM_PARSE_HEADERS;
791 }
792
793 pix_fmt = av_get_pix_fmt(s->pixel_format);
794
795 if (pix_fmt == AV_PIX_FMT_NONE && !codec) {
796 av_log(s1, AV_LOG_ERROR, "No such input format: %s.\n",
797 s->pixel_format);
798
799 return AVERROR(EINVAL);
800 }
801 }
802
803 if (!s->width && !s->height) {
804 struct v4l2_format fmt;
805
806 av_log(s1, AV_LOG_VERBOSE,
807 "Querying the device for the current frame size\n");
808 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
809 if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
810 char errbuf[128];
811 res = AVERROR(errno);
812 av_strerror(res, errbuf, sizeof(errbuf));
813 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
814 errbuf);
815 return res;
816 }
817
818 s->width = fmt.fmt.pix.width;
819 s->height = fmt.fmt.pix.height;
820 av_log(s1, AV_LOG_VERBOSE,
821 "Setting frame size to %dx%d\n", s->width, s->height);
822 }
823
824 desired_format = device_try_init(s1, pix_fmt, &s->width, &s->height,
825 &codec_id);
826 if (desired_format == 0) {
827 av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for "
828 "codec_id %d, pix_fmt %d.\n", s1->video_codec_id, pix_fmt);
829 close(s->fd);
830
831 return AVERROR(EIO);
832 }
833
834 if ((res = av_image_check_size(s->width, s->height, 0, s1) < 0))
835 return res;
836
837 s->frame_format = desired_format;
838
839 if ((res = v4l2_set_parameters(s1) < 0))
840 return res;
841
842 st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id);
843 s->frame_size =
844 avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
845
846 if ((res = mmap_init(s1)) ||
847 (res = mmap_start(s1)) < 0) {
848 close(s->fd);
849 return res;
850 }
851
852 s->top_field_first = first_field(s->fd);
853
854 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
855 st->codec->codec_id = codec_id;
856 if (codec_id == AV_CODEC_ID_RAWVIDEO)
857 st->codec->codec_tag =
858 avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
859 st->codec->width = s->width;
860 st->codec->height = s->height;
861 st->codec->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8;
862
863 return 0;
864 }
865
866 static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
867 {
868 struct video_data *s = s1->priv_data;
869 AVFrame *frame = s1->streams[0]->codec->coded_frame;
870 int res;
871
872 av_init_packet(pkt);
873 if ((res = mmap_read_frame(s1, pkt)) < 0) {
874 return res;
875 }
876
877 if (frame && s->interlaced) {
878 frame->interlaced_frame = 1;
879 frame->top_field_first = s->top_field_first;
880 }
881
882 return pkt->size;
883 }
884
885 static int v4l2_read_close(AVFormatContext *s1)
886 {
887 struct video_data *s = s1->priv_data;
888
889 if (avpriv_atomic_int_get(&s->buffers_queued) != s->buffers)
890 av_log(s1, AV_LOG_WARNING, "Some buffers are still owned by the caller on "
891 "close.\n");
892
893 mmap_close(s);
894
895 close(s->fd);
896 return 0;
897 }
898
899 #define OFFSET(x) offsetof(struct video_data, x)
900 #define DEC AV_OPT_FLAG_DECODING_PARAM
901 static const AVOption options[] = {
902 { "standard", "TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
903 { "channel", "TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
904 { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
905 { "pixel_format", "Preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
906 { "input_format", "Preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
907 { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
908 { "list_formats", "List available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC, "list_formats" },
909 { "all", "Show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" },
910 { "raw", "Show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" },
911 { "compressed", "Show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" },
912 { NULL },
913 };
914
915 static const AVClass v4l2_class = {
916 .class_name = "V4L2 indev",
917 .item_name = av_default_item_name,
918 .option = options,
919 .version = LIBAVUTIL_VERSION_INT,
920 };
921
922 AVInputFormat ff_v4l2_demuxer = {
923 .name = "video4linux2",
924 .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
925 .priv_data_size = sizeof(struct video_data),
926 .read_header = v4l2_read_header,
927 .read_packet = v4l2_read_packet,
928 .read_close = v4l2_read_close,
929 .flags = AVFMT_NOFILE,
930 .priv_class = &v4l2_class,
931 };