FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/v4l2_context.c
Date: 2022-01-21 12:56:39
Exec Total Coverage
Lines: 0 371 0.0%
Branches: 0 348 0.0%
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1 /*
2 * V4L2 context helper functions.
3 *
4 * Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
5 * Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #include <linux/videodev2.h>
25 #include <sys/ioctl.h>
26 #include <sys/mman.h>
27 #include <unistd.h>
28 #include <fcntl.h>
29 #include <poll.h>
30 #include "libavcodec/avcodec.h"
31 #include "libavcodec/internal.h"
32 #include "v4l2_buffers.h"
33 #include "v4l2_fmt.h"
34 #include "v4l2_m2m.h"
35
36 struct v4l2_format_update {
37 uint32_t v4l2_fmt;
38 int update_v4l2;
39
40 enum AVPixelFormat av_fmt;
41 int update_avfmt;
42 };
43
44 ✗ static inline V4L2m2mContext *ctx_to_m2mctx(V4L2Context *ctx)
45 {
46 ✗ return V4L2_TYPE_IS_OUTPUT(ctx->type) ?
47 ✗ container_of(ctx, V4L2m2mContext, output) :
48 ✗ container_of(ctx, V4L2m2mContext, capture);
49 }
50
51 ✗ static inline AVCodecContext *logger(V4L2Context *ctx)
52 {
53 ✗ return ctx_to_m2mctx(ctx)->avctx;
54 }
55
56 ✗ static inline unsigned int v4l2_get_width(struct v4l2_format *fmt)
57 {
58 ✗ return V4L2_TYPE_IS_MULTIPLANAR(fmt->type) ? fmt->fmt.pix_mp.width : fmt->fmt.pix.width;
59 }
60
61 ✗ static inline unsigned int v4l2_get_height(struct v4l2_format *fmt)
62 {
63 ✗ return V4L2_TYPE_IS_MULTIPLANAR(fmt->type) ? fmt->fmt.pix_mp.height : fmt->fmt.pix.height;
64 }
65
66 ✗ static AVRational v4l2_get_sar(V4L2Context *ctx)
67 {
68 ✗ struct AVRational sar = { 0, 1 };
69 struct v4l2_cropcap cropcap;
70 int ret;
71
72 ✗ memset(&cropcap, 0, sizeof(cropcap));
73 ✗ cropcap.type = ctx->type;
74
75 ✗ ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_CROPCAP, &cropcap);
76 ✗ if (ret)
77 ✗ return sar;
78
79 ✗ sar.num = cropcap.pixelaspect.numerator;
80 ✗ sar.den = cropcap.pixelaspect.denominator;
81 ✗ return sar;
82 }
83
84 ✗ static inline unsigned int v4l2_resolution_changed(V4L2Context *ctx, struct v4l2_format *fmt2)
85 {
86 ✗ struct v4l2_format *fmt1 = &ctx->format;
87 ✗ int ret = V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ?
88 ✗ fmt1->fmt.pix_mp.width != fmt2->fmt.pix_mp.width ||
89 ✗ fmt1->fmt.pix_mp.height != fmt2->fmt.pix_mp.height
90 ✗ :
91 ✗ fmt1->fmt.pix.width != fmt2->fmt.pix.width ||
92 ✗ fmt1->fmt.pix.height != fmt2->fmt.pix.height;
93
94 ✗ if (ret)
95 ✗ av_log(logger(ctx), AV_LOG_DEBUG, "%s changed (%dx%d) -> (%dx%d)\n",
96 ctx->name,
97 v4l2_get_width(fmt1), v4l2_get_height(fmt1),
98 v4l2_get_width(fmt2), v4l2_get_height(fmt2));
99
100 ✗ return ret;
101 }
102
103 ✗ static inline int v4l2_type_supported(V4L2Context *ctx)
104 {
105 ✗ return ctx->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE ||
106 ✗ ctx->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE ||
107 ✗ ctx->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ||
108 ✗ ctx->type == V4L2_BUF_TYPE_VIDEO_OUTPUT;
109 }
110
111 ✗ static inline int v4l2_get_framesize_compressed(V4L2Context* ctx, int width, int height)
112 {
113 ✗ V4L2m2mContext *s = ctx_to_m2mctx(ctx);
114 ✗ const int SZ_4K = 0x1000;
115 int size;
116
117 ✗ if (s->avctx && av_codec_is_decoder(s->avctx->codec))
118 ✗ return ((width * height * 3 / 2) / 2) + 128;
119
120 /* encoder */
121 ✗ size = FFALIGN(height, 32) * FFALIGN(width, 32) * 3 / 2 / 2;
122 ✗ return FFALIGN(size, SZ_4K);
123 }
124
125 ✗ static inline void v4l2_save_to_context(V4L2Context* ctx, struct v4l2_format_update *fmt)
126 {
127 ✗ ctx->format.type = ctx->type;
128
129 ✗ if (fmt->update_avfmt)
130 ✗ ctx->av_pix_fmt = fmt->av_fmt;
131
132 ✗ if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
133 /* update the sizes to handle the reconfiguration of the capture stream at runtime */
134 ✗ ctx->format.fmt.pix_mp.height = ctx->height;
135 ✗ ctx->format.fmt.pix_mp.width = ctx->width;
136 ✗ if (fmt->update_v4l2) {
137 ✗ ctx->format.fmt.pix_mp.pixelformat = fmt->v4l2_fmt;
138
139 /* s5p-mfc requires the user to specify a buffer size */
140 ✗ ctx->format.fmt.pix_mp.plane_fmt[0].sizeimage =
141 ✗ v4l2_get_framesize_compressed(ctx, ctx->width, ctx->height);
142 }
143 } else {
144 ✗ ctx->format.fmt.pix.height = ctx->height;
145 ✗ ctx->format.fmt.pix.width = ctx->width;
146 ✗ if (fmt->update_v4l2) {
147 ✗ ctx->format.fmt.pix.pixelformat = fmt->v4l2_fmt;
148
149 /* s5p-mfc requires the user to specify a buffer size */
150 ✗ ctx->format.fmt.pix.sizeimage =
151 ✗ v4l2_get_framesize_compressed(ctx, ctx->width, ctx->height);
152 }
153 }
154 }
155
156 ✗ static int v4l2_start_decode(V4L2Context *ctx)
157 {
158 ✗ struct v4l2_decoder_cmd cmd = {
159 .cmd = V4L2_DEC_CMD_START,
160 .flags = 0,
161 };
162 int ret;
163
164 ✗ ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_DECODER_CMD, &cmd);
165 ✗ if (ret)
166 ✗ return AVERROR(errno);
167
168 ✗ return 0;
169 }
170
171 /**
172 * handle resolution change event and end of stream event
173 * returns 1 if reinit was successful, negative if it failed
174 * returns 0 if reinit was not executed
175 */
176 ✗ static int v4l2_handle_event(V4L2Context *ctx)
177 {
178 ✗ V4L2m2mContext *s = ctx_to_m2mctx(ctx);
179 ✗ struct v4l2_format cap_fmt = s->capture.format;
180 ✗ struct v4l2_event evt = { 0 };
181 int ret;
182
183 ✗ ret = ioctl(s->fd, VIDIOC_DQEVENT, &evt);
184 ✗ if (ret < 0) {
185 ✗ av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_DQEVENT\n", ctx->name);
186 ✗ return 0;
187 }
188
189 ✗ if (evt.type == V4L2_EVENT_EOS) {
190 ✗ ctx->done = 1;
191 ✗ return 0;
192 }
193
194 ✗ if (evt.type != V4L2_EVENT_SOURCE_CHANGE)
195 ✗ return 0;
196
197 ✗ ret = ioctl(s->fd, VIDIOC_G_FMT, &cap_fmt);
198 ✗ if (ret) {
199 ✗ av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_G_FMT\n", s->capture.name);
200 ✗ return 0;
201 }
202
203 ✗ if (v4l2_resolution_changed(&s->capture, &cap_fmt)) {
204 ✗ s->capture.height = v4l2_get_height(&cap_fmt);
205 ✗ s->capture.width = v4l2_get_width(&cap_fmt);
206 ✗ s->capture.sample_aspect_ratio = v4l2_get_sar(&s->capture);
207 } else {
208 ✗ v4l2_start_decode(ctx);
209 ✗ return 0;
210 }
211
212 ✗ s->reinit = 1;
213
214 ✗ if (s->avctx)
215 ✗ ret = ff_set_dimensions(s->avctx, s->capture.width, s->capture.height);
216 ✗ if (ret < 0)
217 ✗ av_log(logger(ctx), AV_LOG_WARNING, "update avcodec height and width\n");
218
219 ✗ ret = ff_v4l2_m2m_codec_reinit(s);
220 ✗ if (ret) {
221 ✗ av_log(logger(ctx), AV_LOG_ERROR, "v4l2_m2m_codec_reinit\n");
222 ✗ return AVERROR(EINVAL);
223 }
224
225 /* reinit executed */
226 ✗ return 1;
227 }
228
229 ✗ static int v4l2_stop_decode(V4L2Context *ctx)
230 {
231 ✗ struct v4l2_decoder_cmd cmd = {
232 .cmd = V4L2_DEC_CMD_STOP,
233 .flags = 0,
234 };
235 int ret;
236
237 ✗ ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_DECODER_CMD, &cmd);
238 ✗ if (ret) {
239 /* DECODER_CMD is optional */
240 ✗ if (errno == ENOTTY)
241 ✗ return ff_v4l2_context_set_status(ctx, VIDIOC_STREAMOFF);
242 else
243 ✗ return AVERROR(errno);
244 }
245
246 ✗ return 0;
247 }
248
249 ✗ static int v4l2_stop_encode(V4L2Context *ctx)
250 {
251 ✗ struct v4l2_encoder_cmd cmd = {
252 .cmd = V4L2_ENC_CMD_STOP,
253 .flags = 0,
254 };
255 int ret;
256
257 ✗ ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_ENCODER_CMD, &cmd);
258 ✗ if (ret) {
259 /* ENCODER_CMD is optional */
260 ✗ if (errno == ENOTTY)
261 ✗ return ff_v4l2_context_set_status(ctx, VIDIOC_STREAMOFF);
262 else
263 ✗ return AVERROR(errno);
264 }
265
266 ✗ return 0;
267 }
268
269 ✗ static V4L2Buffer* v4l2_dequeue_v4l2buf(V4L2Context *ctx, int timeout)
270 {
271 struct v4l2_plane planes[VIDEO_MAX_PLANES];
272 ✗ struct v4l2_buffer buf = { 0 };
273 V4L2Buffer *avbuf;
274 ✗ struct pollfd pfd = {
275 .events = POLLIN | POLLRDNORM | POLLPRI | POLLOUT | POLLWRNORM, /* default blocking capture */
276 ✗ .fd = ctx_to_m2mctx(ctx)->fd,
277 };
278 int i, ret;
279
280 ✗ if (!V4L2_TYPE_IS_OUTPUT(ctx->type) && ctx->buffers) {
281 ✗ for (i = 0; i < ctx->num_buffers; i++) {
282 ✗ if (ctx->buffers[i].status == V4L2BUF_IN_DRIVER)
283 ✗ break;
284 }
285 ✗ if (i == ctx->num_buffers)
286 ✗ av_log(logger(ctx), AV_LOG_WARNING, "All capture buffers returned to "
287 "userspace. Increase num_capture_buffers "
288 "to prevent device deadlock or dropped "
289 "packets/frames.\n");
290 }
291
292 /* if we are draining and there are no more capture buffers queued in the driver we are done */
293 ✗ if (!V4L2_TYPE_IS_OUTPUT(ctx->type) && ctx_to_m2mctx(ctx)->draining) {
294 ✗ for (i = 0; i < ctx->num_buffers; i++) {
295 /* capture buffer initialization happens during decode hence
296 * detection happens at runtime
297 */
298 ✗ if (!ctx->buffers)
299 ✗ break;
300
301 ✗ if (ctx->buffers[i].status == V4L2BUF_IN_DRIVER)
302 ✗ goto start;
303 }
304 ✗ ctx->done = 1;
305 ✗ return NULL;
306 }
307
308 ✗ start:
309 ✗ if (V4L2_TYPE_IS_OUTPUT(ctx->type))
310 ✗ pfd.events = POLLOUT | POLLWRNORM;
311 else {
312 /* no need to listen to requests for more input while draining */
313 ✗ if (ctx_to_m2mctx(ctx)->draining)
314 ✗ pfd.events = POLLIN | POLLRDNORM | POLLPRI;
315 }
316
317 for (;;) {
318 ✗ ret = poll(&pfd, 1, timeout);
319 ✗ if (ret > 0)
320 ✗ break;
321 ✗ if (errno == EINTR)
322 ✗ continue;
323 ✗ return NULL;
324 }
325
326 /* 0. handle errors */
327 ✗ if (pfd.revents & POLLERR) {
328 /* if we are trying to get free buffers but none have been queued yet
329 no need to raise a warning */
330 ✗ if (timeout == 0) {
331 ✗ for (i = 0; i < ctx->num_buffers; i++) {
332 ✗ if (ctx->buffers[i].status != V4L2BUF_AVAILABLE)
333 ✗ av_log(logger(ctx), AV_LOG_WARNING, "%s POLLERR\n", ctx->name);
334 }
335 }
336 else
337 ✗ av_log(logger(ctx), AV_LOG_WARNING, "%s POLLERR\n", ctx->name);
338
339 ✗ return NULL;
340 }
341
342 /* 1. handle resolution changes */
343 ✗ if (pfd.revents & POLLPRI) {
344 ✗ ret = v4l2_handle_event(ctx);
345 ✗ if (ret < 0) {
346 /* if re-init failed, abort */
347 ✗ ctx->done = 1;
348 ✗ return NULL;
349 }
350 ✗ if (ret) {
351 /* if re-init was successful drop the buffer (if there was one)
352 * since we had to reconfigure capture (unmap all buffers)
353 */
354 ✗ return NULL;
355 }
356 }
357
358 /* 2. dequeue the buffer */
359 ✗ if (pfd.revents & (POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM)) {
360
361 ✗ if (!V4L2_TYPE_IS_OUTPUT(ctx->type)) {
362 /* there is a capture buffer ready */
363 ✗ if (pfd.revents & (POLLIN | POLLRDNORM))
364 ✗ goto dequeue;
365
366 /* the driver is ready to accept more input; instead of waiting for the capture
367 * buffer to complete we return NULL so input can proceed (we are single threaded)
368 */
369 ✗ if (pfd.revents & (POLLOUT | POLLWRNORM))
370 ✗ return NULL;
371 }
372
373 ✗ dequeue:
374 ✗ memset(&buf, 0, sizeof(buf));
375 ✗ buf.memory = V4L2_MEMORY_MMAP;
376 ✗ buf.type = ctx->type;
377 ✗ if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
378 ✗ memset(planes, 0, sizeof(planes));
379 ✗ buf.length = VIDEO_MAX_PLANES;
380 ✗ buf.m.planes = planes;
381 }
382
383 ✗ ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_DQBUF, &buf);
384 ✗ if (ret) {
385 ✗ if (errno != EAGAIN) {
386 ✗ ctx->done = 1;
387 ✗ if (errno != EPIPE)
388 ✗ av_log(logger(ctx), AV_LOG_DEBUG, "%s VIDIOC_DQBUF, errno (%s)\n",
389 ✗ ctx->name, av_err2str(AVERROR(errno)));
390 }
391 ✗ return NULL;
392 }
393
394 ✗ if (ctx_to_m2mctx(ctx)->draining && !V4L2_TYPE_IS_OUTPUT(ctx->type)) {
395 ✗ int bytesused = V4L2_TYPE_IS_MULTIPLANAR(buf.type) ?
396 ✗ buf.m.planes[0].bytesused : buf.bytesused;
397 ✗ if (bytesused == 0) {
398 ✗ ctx->done = 1;
399 ✗ return NULL;
400 }
401 #ifdef V4L2_BUF_FLAG_LAST
402 ✗ if (buf.flags & V4L2_BUF_FLAG_LAST)
403 ✗ ctx->done = 1;
404 #endif
405 }
406
407 ✗ avbuf = &ctx->buffers[buf.index];
408 ✗ avbuf->status = V4L2BUF_AVAILABLE;
409 ✗ avbuf->buf = buf;
410 ✗ if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
411 ✗ memcpy(avbuf->planes, planes, sizeof(planes));
412 ✗ avbuf->buf.m.planes = avbuf->planes;
413 }
414 ✗ return avbuf;
415 }
416
417 ✗ return NULL;
418 }
419
420 ✗ static V4L2Buffer* v4l2_getfree_v4l2buf(V4L2Context *ctx)
421 {
422 ✗ int timeout = 0; /* return when no more buffers to dequeue */
423 int i;
424
425 /* get back as many output buffers as possible */
426 ✗ if (V4L2_TYPE_IS_OUTPUT(ctx->type)) {
427 do {
428 ✗ } while (v4l2_dequeue_v4l2buf(ctx, timeout));
429 }
430
431 ✗ for (i = 0; i < ctx->num_buffers; i++) {
432 ✗ if (ctx->buffers[i].status == V4L2BUF_AVAILABLE)
433 ✗ return &ctx->buffers[i];
434 }
435
436 ✗ return NULL;
437 }
438
439 ✗ static int v4l2_release_buffers(V4L2Context* ctx)
440 {
441 ✗ struct v4l2_requestbuffers req = {
442 .memory = V4L2_MEMORY_MMAP,
443 ✗ .type = ctx->type,
444 .count = 0, /* 0 -> unmaps buffers from the driver */
445 };
446 int i, j;
447
448 ✗ for (i = 0; i < ctx->num_buffers; i++) {
449 ✗ V4L2Buffer *buffer = &ctx->buffers[i];
450
451 ✗ for (j = 0; j < buffer->num_planes; j++) {
452 ✗ struct V4L2Plane_info *p = &buffer->plane_info[j];
453 ✗ if (p->mm_addr && p->length)
454 ✗ if (munmap(p->mm_addr, p->length) < 0)
455 ✗ av_log(logger(ctx), AV_LOG_ERROR, "%s unmap plane (%s))\n", ctx->name, av_err2str(AVERROR(errno)));
456 }
457 }
458
459 ✗ return ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_REQBUFS, &req);
460 }
461
462 ✗ static inline int v4l2_try_raw_format(V4L2Context* ctx, enum AVPixelFormat pixfmt)
463 {
464 ✗ struct v4l2_format *fmt = &ctx->format;
465 uint32_t v4l2_fmt;
466 int ret;
467
468 ✗ v4l2_fmt = ff_v4l2_format_avfmt_to_v4l2(pixfmt);
469 ✗ if (!v4l2_fmt)
470 ✗ return AVERROR(EINVAL);
471
472 ✗ if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type))
473 ✗ fmt->fmt.pix_mp.pixelformat = v4l2_fmt;
474 else
475 ✗ fmt->fmt.pix.pixelformat = v4l2_fmt;
476
477 ✗ fmt->type = ctx->type;
478
479 ✗ ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_TRY_FMT, fmt);
480 ✗ if (ret)
481 ✗ return AVERROR(EINVAL);
482
483 ✗ return 0;
484 }
485
486 ✗ static int v4l2_get_raw_format(V4L2Context* ctx, enum AVPixelFormat *p)
487 {
488 ✗ enum AVPixelFormat pixfmt = ctx->av_pix_fmt;
489 struct v4l2_fmtdesc fdesc;
490 int ret;
491
492 ✗ memset(&fdesc, 0, sizeof(fdesc));
493 ✗ fdesc.type = ctx->type;
494
495 ✗ if (pixfmt != AV_PIX_FMT_NONE) {
496 ✗ ret = v4l2_try_raw_format(ctx, pixfmt);
497 ✗ if (!ret)
498 ✗ return 0;
499 }
500
501 for (;;) {
502 ✗ ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_ENUM_FMT, &fdesc);
503 ✗ if (ret)
504 ✗ return AVERROR(EINVAL);
505
506 ✗ pixfmt = ff_v4l2_format_v4l2_to_avfmt(fdesc.pixelformat, AV_CODEC_ID_RAWVIDEO);
507 ✗ ret = v4l2_try_raw_format(ctx, pixfmt);
508 ✗ if (ret){
509 ✗ fdesc.index++;
510 ✗ continue;
511 }
512
513 ✗ *p = pixfmt;
514
515 ✗ return 0;
516 }
517
518 return AVERROR(EINVAL);
519 }
520
521 ✗ static int v4l2_get_coded_format(V4L2Context* ctx, uint32_t *p)
522 {
523 struct v4l2_fmtdesc fdesc;
524 uint32_t v4l2_fmt;
525 int ret;
526
527 /* translate to a valid v4l2 format */
528 ✗ v4l2_fmt = ff_v4l2_format_avcodec_to_v4l2(ctx->av_codec_id);
529 ✗ if (!v4l2_fmt)
530 ✗ return AVERROR(EINVAL);
531
532 /* check if the driver supports this format */
533 ✗ memset(&fdesc, 0, sizeof(fdesc));
534 ✗ fdesc.type = ctx->type;
535
536 for (;;) {
537 ✗ ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_ENUM_FMT, &fdesc);
538 ✗ if (ret)
539 ✗ return AVERROR(EINVAL);
540
541 ✗ if (fdesc.pixelformat == v4l2_fmt)
542 ✗ break;
543
544 ✗ fdesc.index++;
545 }
546
547 ✗ *p = v4l2_fmt;
548
549 ✗ return 0;
550 }
551
552 /*****************************************************************************
553 *
554 * V4L2 Context Interface
555 *
556 *****************************************************************************/
557
558 ✗ int ff_v4l2_context_set_status(V4L2Context* ctx, uint32_t cmd)
559 {
560 ✗ int type = ctx->type;
561 int ret;
562
563 ✗ ret = ioctl(ctx_to_m2mctx(ctx)->fd, cmd, &type);
564 ✗ if (ret < 0)
565 ✗ return AVERROR(errno);
566
567 ✗ ctx->streamon = (cmd == VIDIOC_STREAMON);
568
569 ✗ return 0;
570 }
571
572 ✗ int ff_v4l2_context_enqueue_frame(V4L2Context* ctx, const AVFrame* frame)
573 {
574 ✗ V4L2m2mContext *s = ctx_to_m2mctx(ctx);
575 V4L2Buffer* avbuf;
576 int ret;
577
578 ✗ if (!frame) {
579 ✗ ret = v4l2_stop_encode(ctx);
580 ✗ if (ret)
581 ✗ av_log(logger(ctx), AV_LOG_ERROR, "%s stop_encode\n", ctx->name);
582 ✗ s->draining= 1;
583 ✗ return 0;
584 }
585
586 ✗ avbuf = v4l2_getfree_v4l2buf(ctx);
587 ✗ if (!avbuf)
588 ✗ return AVERROR(EAGAIN);
589
590 ✗ ret = ff_v4l2_buffer_avframe_to_buf(frame, avbuf);
591 ✗ if (ret)
592 ✗ return ret;
593
594 ✗ return ff_v4l2_buffer_enqueue(avbuf);
595 }
596
597 ✗ int ff_v4l2_context_enqueue_packet(V4L2Context* ctx, const AVPacket* pkt)
598 {
599 ✗ V4L2m2mContext *s = ctx_to_m2mctx(ctx);
600 V4L2Buffer* avbuf;
601 int ret;
602
603 ✗ if (!pkt->size) {
604 ✗ ret = v4l2_stop_decode(ctx);
605 ✗ if (ret)
606 ✗ av_log(logger(ctx), AV_LOG_ERROR, "%s stop_decode\n", ctx->name);
607 ✗ s->draining = 1;
608 ✗ return 0;
609 }
610
611 ✗ avbuf = v4l2_getfree_v4l2buf(ctx);
612 ✗ if (!avbuf)
613 ✗ return AVERROR(EAGAIN);
614
615 ✗ ret = ff_v4l2_buffer_avpkt_to_buf(pkt, avbuf);
616 ✗ if (ret)
617 ✗ return ret;
618
619 ✗ return ff_v4l2_buffer_enqueue(avbuf);
620 }
621
622 ✗ int ff_v4l2_context_dequeue_frame(V4L2Context* ctx, AVFrame* frame, int timeout)
623 {
624 V4L2Buffer *avbuf;
625
626 /*
627 * timeout=-1 blocks until:
628 * 1. decoded frame available
629 * 2. an input buffer is ready to be dequeued
630 */
631 ✗ avbuf = v4l2_dequeue_v4l2buf(ctx, timeout);
632 ✗ if (!avbuf) {
633 ✗ if (ctx->done)
634 ✗ return AVERROR_EOF;
635
636 ✗ return AVERROR(EAGAIN);
637 }
638
639 ✗ return ff_v4l2_buffer_buf_to_avframe(frame, avbuf);
640 }
641
642 ✗ int ff_v4l2_context_dequeue_packet(V4L2Context* ctx, AVPacket* pkt)
643 {
644 V4L2Buffer *avbuf;
645
646 /*
647 * blocks until:
648 * 1. encoded packet available
649 * 2. an input buffer ready to be dequeued
650 */
651 ✗ avbuf = v4l2_dequeue_v4l2buf(ctx, -1);
652 ✗ if (!avbuf) {
653 ✗ if (ctx->done)
654 ✗ return AVERROR_EOF;
655
656 ✗ return AVERROR(EAGAIN);
657 }
658
659 ✗ return ff_v4l2_buffer_buf_to_avpkt(pkt, avbuf);
660 }
661
662 ✗ int ff_v4l2_context_get_format(V4L2Context* ctx, int probe)
663 {
664 ✗ struct v4l2_format_update fmt = { 0 };
665 int ret;
666
667 ✗ if (ctx->av_codec_id == AV_CODEC_ID_RAWVIDEO) {
668 ✗ ret = v4l2_get_raw_format(ctx, &fmt.av_fmt);
669 ✗ if (ret)
670 ✗ return ret;
671
672 ✗ fmt.update_avfmt = !probe;
673 ✗ v4l2_save_to_context(ctx, &fmt);
674
675 /* format has been tried already */
676 ✗ return ret;
677 }
678
679 ✗ ret = v4l2_get_coded_format(ctx, &fmt.v4l2_fmt);
680 ✗ if (ret)
681 ✗ return ret;
682
683 ✗ fmt.update_v4l2 = 1;
684 ✗ v4l2_save_to_context(ctx, &fmt);
685
686 ✗ return ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_TRY_FMT, &ctx->format);
687 }
688
689 ✗ int ff_v4l2_context_set_format(V4L2Context* ctx)
690 {
691 ✗ return ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_S_FMT, &ctx->format);
692 }
693
694 ✗ void ff_v4l2_context_release(V4L2Context* ctx)
695 {
696 int ret;
697
698 ✗ if (!ctx->buffers)
699 ✗ return;
700
701 ✗ ret = v4l2_release_buffers(ctx);
702 ✗ if (ret)
703 ✗ av_log(logger(ctx), AV_LOG_WARNING, "V4L2 failed to unmap the %s buffers\n", ctx->name);
704
705 ✗ av_freep(&ctx->buffers);
706 }
707
708 ✗ int ff_v4l2_context_init(V4L2Context* ctx)
709 {
710 ✗ V4L2m2mContext *s = ctx_to_m2mctx(ctx);
711 struct v4l2_requestbuffers req;
712 int ret, i;
713
714 ✗ if (!v4l2_type_supported(ctx)) {
715 ✗ av_log(logger(ctx), AV_LOG_ERROR, "type %i not supported\n", ctx->type);
716 ✗ return AVERROR_PATCHWELCOME;
717 }
718
719 ✗ ret = ioctl(s->fd, VIDIOC_G_FMT, &ctx->format);
720 ✗ if (ret)
721 ✗ av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_G_FMT failed\n", ctx->name);
722
723 ✗ memset(&req, 0, sizeof(req));
724 ✗ req.count = ctx->num_buffers;
725 ✗ req.memory = V4L2_MEMORY_MMAP;
726 ✗ req.type = ctx->type;
727 ✗ ret = ioctl(s->fd, VIDIOC_REQBUFS, &req);
728 ✗ if (ret < 0) {
729 ✗ av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_REQBUFS failed: %s\n", ctx->name, strerror(errno));
730 ✗ return AVERROR(errno);
731 }
732
733 ✗ ctx->num_buffers = req.count;
734 ✗ ctx->buffers = av_mallocz(ctx->num_buffers * sizeof(V4L2Buffer));
735 ✗ if (!ctx->buffers) {
736 ✗ av_log(logger(ctx), AV_LOG_ERROR, "%s malloc enomem\n", ctx->name);
737 ✗ return AVERROR(ENOMEM);
738 }
739
740 ✗ for (i = 0; i < req.count; i++) {
741 ✗ ctx->buffers[i].context = ctx;
742 ✗ ret = ff_v4l2_buffer_initialize(&ctx->buffers[i], i);
743 ✗ if (ret < 0) {
744 ✗ av_log(logger(ctx), AV_LOG_ERROR, "%s buffer[%d] initialization (%s)\n", ctx->name, i, av_err2str(ret));
745 ✗ goto error;
746 }
747 }
748
749 ✗ av_log(logger(ctx), AV_LOG_DEBUG, "%s: %s %02d buffers initialized: %04ux%04u, sizeimage %08u, bytesperline %08u\n", ctx->name,
750 ✗ V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ? av_fourcc2str(ctx->format.fmt.pix_mp.pixelformat) : av_fourcc2str(ctx->format.fmt.pix.pixelformat),
751 req.count,
752 v4l2_get_width(&ctx->format),
753 v4l2_get_height(&ctx->format),
754 ✗ V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ? ctx->format.fmt.pix_mp.plane_fmt[0].sizeimage : ctx->format.fmt.pix.sizeimage,
755 ✗ V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ? ctx->format.fmt.pix_mp.plane_fmt[0].bytesperline : ctx->format.fmt.pix.bytesperline);
756
757 ✗ return 0;
758
759 ✗ error:
760 ✗ v4l2_release_buffers(ctx);
761
762 ✗ av_freep(&ctx->buffers);
763
764 ✗ return ret;
765 }
766