FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/v4l2_buffers.c
Date: 2026-05-03 13:33:45
Exec Total Coverage
Lines: 0 311 0.0%
Functions: 0 22 0.0%
Branches: 0 238 0.0%
Line Branch Exec Source
1 /*
2 * V4L2 buffer 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 "libavutil/attributes.h"
32 #include "libavutil/pixdesc.h"
33 #include "libavutil/refstruct.h"
34 #include "v4l2_context.h"
35 #include "v4l2_buffers.h"
36 #include "v4l2_m2m.h"
37
38 #ifndef USEC_PER_SEC
39 #define USEC_PER_SEC 1000000
40 #endif
41
42 static AVRational v4l2_timebase = { 1, USEC_PER_SEC };
43
44 ✗ static inline V4L2m2mContext *buf_to_m2mctx(V4L2Buffer *buf)
45 {
46 ✗ return V4L2_TYPE_IS_OUTPUT(buf->context->type) ?
47 ✗ container_of(buf->context, V4L2m2mContext, output) :
48 ✗ container_of(buf->context, V4L2m2mContext, capture);
49 }
50
51 ✗ static inline AVCodecContext *logger(V4L2Buffer *buf)
52 {
53 ✗ return buf_to_m2mctx(buf)->avctx;
54 }
55
56 ✗ static inline AVRational v4l2_get_timebase(V4L2Buffer *avbuf)
57 {
58 ✗ V4L2m2mContext *s = buf_to_m2mctx(avbuf);
59
60 ✗ if (s->avctx->pkt_timebase.num)
61 ✗ return s->avctx->pkt_timebase;
62 ✗ return s->avctx->time_base;
63 }
64
65 ✗ static inline void v4l2_set_pts(V4L2Buffer *out, int64_t pts)
66 {
67 int64_t v4l2_pts;
68
69 ✗ if (pts == AV_NOPTS_VALUE)
70 ✗ pts = 0;
71
72 /* convert pts to v4l2 timebase */
73 ✗ v4l2_pts = av_rescale_q(pts, v4l2_get_timebase(out), v4l2_timebase);
74 ✗ out->buf.timestamp.tv_usec = v4l2_pts % USEC_PER_SEC;
75 ✗ out->buf.timestamp.tv_sec = v4l2_pts / USEC_PER_SEC;
76 ✗ }
77
78 ✗ static inline int64_t v4l2_get_pts(V4L2Buffer *avbuf)
79 {
80 int64_t v4l2_pts;
81
82 /* convert pts back to encoder timebase */
83 ✗ v4l2_pts = (int64_t)avbuf->buf.timestamp.tv_sec * USEC_PER_SEC +
84 ✗ avbuf->buf.timestamp.tv_usec;
85
86 ✗ return av_rescale_q(v4l2_pts, v4l2_timebase, v4l2_get_timebase(avbuf));
87 }
88
89 ✗ static enum AVColorPrimaries v4l2_get_color_primaries(V4L2Buffer *buf)
90 {
91 enum v4l2_ycbcr_encoding ycbcr;
92 enum v4l2_colorspace cs;
93
94 ✗ cs = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
95 ✗ buf->context->format.fmt.pix_mp.colorspace :
96 ✗ buf->context->format.fmt.pix.colorspace;
97
98 ✗ ycbcr = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
99 ✗ buf->context->format.fmt.pix_mp.ycbcr_enc:
100 ✗ buf->context->format.fmt.pix.ycbcr_enc;
101
102 ✗ switch(ycbcr) {
103 ✗ case V4L2_YCBCR_ENC_XV709:
104 ✗ case V4L2_YCBCR_ENC_709: return AVCOL_PRI_BT709;
105 ✗ case V4L2_YCBCR_ENC_XV601:
106 ✗ case V4L2_YCBCR_ENC_601:return AVCOL_PRI_BT470M;
107 ✗ default:
108 ✗ break;
109 }
110
111 ✗ switch(cs) {
112 ✗ case V4L2_COLORSPACE_470_SYSTEM_BG: return AVCOL_PRI_BT470BG;
113 ✗ case V4L2_COLORSPACE_SMPTE170M: return AVCOL_PRI_SMPTE170M;
114 ✗ case V4L2_COLORSPACE_SMPTE240M: return AVCOL_PRI_SMPTE240M;
115 ✗ case V4L2_COLORSPACE_BT2020: return AVCOL_PRI_BT2020;
116 ✗ default:
117 ✗ break;
118 }
119
120 ✗ return AVCOL_PRI_UNSPECIFIED;
121 }
122
123 ✗ static enum AVColorRange v4l2_get_color_range(V4L2Buffer *buf)
124 {
125 enum v4l2_quantization qt;
126
127 ✗ qt = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
128 ✗ buf->context->format.fmt.pix_mp.quantization :
129 ✗ buf->context->format.fmt.pix.quantization;
130
131 ✗ switch (qt) {
132 ✗ case V4L2_QUANTIZATION_LIM_RANGE: return AVCOL_RANGE_MPEG;
133 ✗ case V4L2_QUANTIZATION_FULL_RANGE: return AVCOL_RANGE_JPEG;
134 ✗ default:
135 ✗ break;
136 }
137
138 ✗ return AVCOL_RANGE_UNSPECIFIED;
139 }
140
141 ✗ static enum AVColorSpace v4l2_get_color_space(V4L2Buffer *buf)
142 {
143 enum v4l2_ycbcr_encoding ycbcr;
144 enum v4l2_colorspace cs;
145
146 ✗ cs = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
147 ✗ buf->context->format.fmt.pix_mp.colorspace :
148 ✗ buf->context->format.fmt.pix.colorspace;
149
150 ✗ ycbcr = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
151 ✗ buf->context->format.fmt.pix_mp.ycbcr_enc:
152 ✗ buf->context->format.fmt.pix.ycbcr_enc;
153
154 ✗ switch(cs) {
155 ✗ case V4L2_COLORSPACE_SRGB: return AVCOL_SPC_RGB;
156 ✗ case V4L2_COLORSPACE_REC709: return AVCOL_SPC_BT709;
157 ✗ case V4L2_COLORSPACE_470_SYSTEM_M: return AVCOL_SPC_FCC;
158 ✗ case V4L2_COLORSPACE_470_SYSTEM_BG: return AVCOL_SPC_BT470BG;
159 ✗ case V4L2_COLORSPACE_SMPTE170M: return AVCOL_SPC_SMPTE170M;
160 ✗ case V4L2_COLORSPACE_SMPTE240M: return AVCOL_SPC_SMPTE240M;
161 ✗ case V4L2_COLORSPACE_BT2020:
162 ✗ if (ycbcr == V4L2_YCBCR_ENC_BT2020_CONST_LUM)
163 ✗ return AVCOL_SPC_BT2020_CL;
164 else
165 ✗ return AVCOL_SPC_BT2020_NCL;
166 ✗ default:
167 ✗ break;
168 }
169
170 ✗ return AVCOL_SPC_UNSPECIFIED;
171 }
172
173 ✗ static enum AVColorTransferCharacteristic v4l2_get_color_trc(V4L2Buffer *buf)
174 {
175 enum v4l2_ycbcr_encoding ycbcr;
176 enum v4l2_xfer_func xfer;
177 enum v4l2_colorspace cs;
178
179 ✗ cs = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
180 ✗ buf->context->format.fmt.pix_mp.colorspace :
181 ✗ buf->context->format.fmt.pix.colorspace;
182
183 ✗ ycbcr = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
184 ✗ buf->context->format.fmt.pix_mp.ycbcr_enc:
185 ✗ buf->context->format.fmt.pix.ycbcr_enc;
186
187 ✗ xfer = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
188 ✗ buf->context->format.fmt.pix_mp.xfer_func:
189 ✗ buf->context->format.fmt.pix.xfer_func;
190
191 ✗ switch (xfer) {
192 ✗ case V4L2_XFER_FUNC_709: return AVCOL_TRC_BT709;
193 ✗ case V4L2_XFER_FUNC_SRGB: return AVCOL_TRC_IEC61966_2_1;
194 ✗ case V4L2_XFER_FUNC_SMPTE240M: return AVCOL_TRC_SMPTE240M;
195 ✗ case V4L2_XFER_FUNC_NONE: return AVCOL_TRC_LINEAR;
196 ✗ case V4L2_XFER_FUNC_SMPTE2084: return AVCOL_TRC_SMPTE2084;
197 ✗ default:
198 ✗ break;
199 }
200
201 ✗ switch (cs) {
202 ✗ case V4L2_COLORSPACE_470_SYSTEM_M: return AVCOL_TRC_GAMMA22;
203 ✗ case V4L2_COLORSPACE_470_SYSTEM_BG: return AVCOL_TRC_GAMMA28;
204 ✗ case V4L2_COLORSPACE_SMPTE170M: return AVCOL_TRC_SMPTE170M;
205 ✗ case V4L2_COLORSPACE_SMPTE240M: return AVCOL_TRC_SMPTE240M;
206 ✗ default:
207 ✗ break;
208 }
209
210 ✗ switch (ycbcr) {
211 ✗ case V4L2_YCBCR_ENC_XV709:
212 ✗ case V4L2_YCBCR_ENC_XV601: return AVCOL_TRC_BT1361_ECG;
213 ✗ default:
214 ✗ break;
215 }
216
217 ✗ return AVCOL_TRC_UNSPECIFIED;
218 }
219
220 ✗ static void v4l2_get_interlacing(AVFrame *frame, V4L2Buffer *buf)
221 {
222 ✗ enum v4l2_field field = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
223 ✗ buf->context->format.fmt.pix_mp.field :
224 ✗ buf->context->format.fmt.pix.field;
225
226 ✗ switch (field) {
227 ✗ case V4L2_FIELD_INTERLACED:
228 case V4L2_FIELD_INTERLACED_TB:
229 ✗ frame->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
230 av_fallthrough;
231 ✗ case V4L2_FIELD_INTERLACED_BT:
232 ✗ frame->flags |= AV_FRAME_FLAG_INTERLACED;
233 ✗ break;
234 }
235 ✗ }
236
237 ✗ static void v4l2_free_buffer(void *opaque, uint8_t *unused)
238 {
239 ✗ V4L2Buffer* avbuf = opaque;
240 ✗ V4L2m2mContext *s = buf_to_m2mctx(avbuf);
241
242 ✗ if (atomic_fetch_sub(&avbuf->context_refcount, 1) == 1) {
243 ✗ atomic_fetch_sub_explicit(&s->refcount, 1, memory_order_acq_rel);
244
245 ✗ if (s->reinit) {
246 ✗ if (!atomic_load(&s->refcount))
247 ✗ sem_post(&s->refsync);
248 } else {
249 ✗ if (s->draining && V4L2_TYPE_IS_OUTPUT(avbuf->context->type)) {
250 /* no need to queue more buffers to the driver */
251 ✗ avbuf->status = V4L2BUF_AVAILABLE;
252 }
253 ✗ else if (avbuf->context->streamon)
254 ✗ ff_v4l2_buffer_enqueue(avbuf);
255 }
256
257 ✗ av_refstruct_unref(&avbuf->context_ref);
258 }
259 ✗ }
260
261 ✗ static int v4l2_buf_increase_ref(V4L2Buffer *in)
262 {
263 ✗ V4L2m2mContext *s = buf_to_m2mctx(in);
264
265 ✗ if (in->context_ref)
266 ✗ atomic_fetch_add(&in->context_refcount, 1);
267 else {
268 ✗ in->context_ref = av_refstruct_ref(s->self_ref);
269
270 ✗ in->context_refcount = 1;
271 }
272
273 ✗ in->status = V4L2BUF_RET_USER;
274 ✗ atomic_fetch_add_explicit(&s->refcount, 1, memory_order_relaxed);
275
276 ✗ return 0;
277 }
278
279 ✗ static int v4l2_buf_to_bufref(V4L2Buffer *in, int plane, AVBufferRef **buf)
280 {
281 int ret;
282
283 ✗ if (plane >= in->num_planes)
284 ✗ return AVERROR(EINVAL);
285
286 /* even though most encoders return 0 in data_offset encoding vp8 does require this value */
287 ✗ *buf = av_buffer_create((char *)in->plane_info[plane].mm_addr + in->planes[plane].data_offset,
288 in->plane_info[plane].length, v4l2_free_buffer, in, 0);
289 ✗ if (!*buf)
290 ✗ return AVERROR(ENOMEM);
291
292 ✗ ret = v4l2_buf_increase_ref(in);
293 ✗ if (ret)
294 ✗ av_buffer_unref(buf);
295
296 ✗ return ret;
297 }
298
299 ✗ static int v4l2_bufref_to_buf(V4L2Buffer *out, int plane, const uint8_t* data, int size, int offset)
300 {
301 unsigned int bytesused, length;
302
303 ✗ if (plane >= out->num_planes)
304 ✗ return AVERROR(EINVAL);
305
306 ✗ length = out->plane_info[plane].length;
307 ✗ bytesused = FFMIN(size+offset, length);
308
309 ✗ memcpy((uint8_t*)out->plane_info[plane].mm_addr+offset, data, FFMIN(size, length-offset));
310
311 ✗ if (V4L2_TYPE_IS_MULTIPLANAR(out->buf.type)) {
312 ✗ out->planes[plane].bytesused = bytesused;
313 ✗ out->planes[plane].length = length;
314 } else {
315 ✗ out->buf.bytesused = bytesused;
316 ✗ out->buf.length = length;
317 }
318
319 ✗ return 0;
320 }
321
322 ✗ static int v4l2_buffer_buf_to_swframe(AVFrame *frame, V4L2Buffer *avbuf)
323 {
324 int i, ret;
325
326 ✗ frame->format = avbuf->context->av_pix_fmt;
327
328 ✗ for (i = 0; i < avbuf->num_planes; i++) {
329 ✗ ret = v4l2_buf_to_bufref(avbuf, i, &frame->buf[i]);
330 ✗ if (ret)
331 ✗ return ret;
332
333 ✗ frame->linesize[i] = avbuf->plane_info[i].bytesperline;
334 ✗ frame->data[i] = frame->buf[i]->data;
335 }
336
337 /* fixup special cases */
338 ✗ switch (avbuf->context->av_pix_fmt) {
339 ✗ case AV_PIX_FMT_NV12:
340 case AV_PIX_FMT_NV21:
341 ✗ if (avbuf->num_planes > 1)
342 ✗ break;
343 ✗ frame->linesize[1] = avbuf->plane_info[0].bytesperline;
344 ✗ frame->data[1] = frame->buf[0]->data + avbuf->plane_info[0].bytesperline * avbuf->context->format.fmt.pix_mp.height;
345 ✗ break;
346
347 ✗ case AV_PIX_FMT_YUV420P:
348 ✗ if (avbuf->num_planes > 1)
349 ✗ break;
350 ✗ frame->linesize[1] = avbuf->plane_info[0].bytesperline >> 1;
351 ✗ frame->linesize[2] = avbuf->plane_info[0].bytesperline >> 1;
352 ✗ frame->data[1] = frame->buf[0]->data + avbuf->plane_info[0].bytesperline * avbuf->context->format.fmt.pix_mp.height;
353 ✗ frame->data[2] = frame->data[1] + ((avbuf->plane_info[0].bytesperline * avbuf->context->format.fmt.pix_mp.height) >> 2);
354 ✗ break;
355
356 ✗ default:
357 ✗ break;
358 }
359
360 ✗ return 0;
361 }
362
363 ✗ static int v4l2_buffer_swframe_to_buf(const AVFrame *frame, V4L2Buffer *out)
364 {
365 int i, ret;
366 ✗ struct v4l2_format fmt = out->context->format;
367 ✗ int pixel_format = V4L2_TYPE_IS_MULTIPLANAR(fmt.type) ?
368 ✗ fmt.fmt.pix_mp.pixelformat : fmt.fmt.pix.pixelformat;
369 ✗ int height = V4L2_TYPE_IS_MULTIPLANAR(fmt.type) ?
370 ✗ fmt.fmt.pix_mp.height : fmt.fmt.pix.height;
371 ✗ int is_planar_format = 0;
372
373 ✗ switch (pixel_format) {
374 ✗ case V4L2_PIX_FMT_YUV420M:
375 case V4L2_PIX_FMT_YVU420M:
376 #ifdef V4L2_PIX_FMT_YUV422M
377 case V4L2_PIX_FMT_YUV422M:
378 #endif
379 #ifdef V4L2_PIX_FMT_YVU422M
380 case V4L2_PIX_FMT_YVU422M:
381 #endif
382 #ifdef V4L2_PIX_FMT_YUV444M
383 case V4L2_PIX_FMT_YUV444M:
384 #endif
385 #ifdef V4L2_PIX_FMT_YVU444M
386 case V4L2_PIX_FMT_YVU444M:
387 #endif
388 case V4L2_PIX_FMT_NV12M:
389 case V4L2_PIX_FMT_NV21M:
390 case V4L2_PIX_FMT_NV12MT_16X16:
391 case V4L2_PIX_FMT_NV12MT:
392 case V4L2_PIX_FMT_NV16M:
393 case V4L2_PIX_FMT_NV61M:
394 ✗ is_planar_format = 1;
395 }
396
397 ✗ if (!is_planar_format) {
398 ✗ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
399 ✗ int planes_nb = 0;
400 ✗ int offset = 0;
401
402 ✗ for (i = 0; i < desc->nb_components; i++)
403 ✗ planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
404
405 ✗ for (i = 0; i < planes_nb; i++) {
406 ✗ int size, h = height;
407 ✗ if (i == 1 || i == 2) {
408 ✗ h = AV_CEIL_RSHIFT(h, desc->log2_chroma_h);
409 }
410 ✗ size = frame->linesize[i] * h;
411 ✗ ret = v4l2_bufref_to_buf(out, 0, frame->data[i], size, offset);
412 ✗ if (ret)
413 ✗ return ret;
414 ✗ offset += size;
415 }
416 ✗ return 0;
417 }
418
419 ✗ for (i = 0; i < out->num_planes; i++) {
420 ✗ ret = v4l2_bufref_to_buf(out, i, frame->buf[i]->data, frame->buf[i]->size, 0);
421 ✗ if (ret)
422 ✗ return ret;
423 }
424
425 ✗ return 0;
426 }
427
428 /******************************************************************************
429 *
430 * V4L2Buffer interface
431 *
432 ******************************************************************************/
433
434 ✗ int ff_v4l2_buffer_avframe_to_buf(const AVFrame *frame, V4L2Buffer *out)
435 {
436 ✗ v4l2_set_pts(out, frame->pts);
437
438 ✗ return v4l2_buffer_swframe_to_buf(frame, out);
439 }
440
441 ✗ int ff_v4l2_buffer_buf_to_avframe(AVFrame *frame, V4L2Buffer *avbuf)
442 {
443 int ret;
444
445 ✗ av_frame_unref(frame);
446
447 /* 1. get references to the actual data */
448 ✗ ret = v4l2_buffer_buf_to_swframe(frame, avbuf);
449 ✗ if (ret)
450 ✗ return ret;
451
452 /* 2. get frame information */
453 ✗ if (avbuf->buf.flags & V4L2_BUF_FLAG_KEYFRAME)
454 ✗ frame->flags |= AV_FRAME_FLAG_KEY;
455 ✗ frame->color_primaries = v4l2_get_color_primaries(avbuf);
456 ✗ frame->colorspace = v4l2_get_color_space(avbuf);
457 ✗ frame->color_range = v4l2_get_color_range(avbuf);
458 ✗ frame->color_trc = v4l2_get_color_trc(avbuf);
459 ✗ frame->pts = v4l2_get_pts(avbuf);
460 ✗ frame->pkt_dts = AV_NOPTS_VALUE;
461 ✗ v4l2_get_interlacing(frame, avbuf);
462
463 /* these values are updated also during re-init in v4l2_process_driver_event */
464 ✗ frame->height = avbuf->context->height;
465 ✗ frame->width = avbuf->context->width;
466 ✗ frame->sample_aspect_ratio = avbuf->context->sample_aspect_ratio;
467
468 /* 3. report errors upstream */
469 ✗ if (avbuf->buf.flags & V4L2_BUF_FLAG_ERROR) {
470 ✗ av_log(logger(avbuf), AV_LOG_ERROR, "%s: driver decode error\n", avbuf->context->name);
471 ✗ frame->decode_error_flags |= FF_DECODE_ERROR_INVALID_BITSTREAM;
472 }
473
474 ✗ return 0;
475 }
476
477 ✗ int ff_v4l2_buffer_buf_to_avpkt(AVPacket *pkt, V4L2Buffer *avbuf)
478 {
479 int ret;
480
481 ✗ av_packet_unref(pkt);
482 ✗ ret = v4l2_buf_to_bufref(avbuf, 0, &pkt->buf);
483 ✗ if (ret)
484 ✗ return ret;
485
486 ✗ pkt->size = V4L2_TYPE_IS_MULTIPLANAR(avbuf->buf.type) ? avbuf->buf.m.planes[0].bytesused : avbuf->buf.bytesused;
487 ✗ pkt->data = pkt->buf->data;
488
489 ✗ if (avbuf->buf.flags & V4L2_BUF_FLAG_KEYFRAME)
490 ✗ pkt->flags |= AV_PKT_FLAG_KEY;
491
492 ✗ if (avbuf->buf.flags & V4L2_BUF_FLAG_ERROR) {
493 ✗ av_log(logger(avbuf), AV_LOG_ERROR, "%s driver encode error\n", avbuf->context->name);
494 ✗ pkt->flags |= AV_PKT_FLAG_CORRUPT;
495 }
496
497 ✗ pkt->dts = pkt->pts = v4l2_get_pts(avbuf);
498
499 ✗ return 0;
500 }
501
502 ✗ int ff_v4l2_buffer_avpkt_to_buf(const AVPacket *pkt, V4L2Buffer *out)
503 {
504 int ret;
505
506 ✗ ret = v4l2_bufref_to_buf(out, 0, pkt->data, pkt->size, 0);
507 ✗ if (ret)
508 ✗ return ret;
509
510 ✗ v4l2_set_pts(out, pkt->pts);
511
512 ✗ if (pkt->flags & AV_PKT_FLAG_KEY)
513 ✗ out->flags = V4L2_BUF_FLAG_KEYFRAME;
514
515 ✗ return 0;
516 }
517
518 ✗ int ff_v4l2_buffer_initialize(V4L2Buffer* avbuf, int index)
519 {
520 ✗ V4L2Context *ctx = avbuf->context;
521 int ret, i;
522
523 ✗ avbuf->buf.memory = V4L2_MEMORY_MMAP;
524 ✗ avbuf->buf.type = ctx->type;
525 ✗ avbuf->buf.index = index;
526
527 ✗ if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
528 ✗ avbuf->buf.length = VIDEO_MAX_PLANES;
529 ✗ avbuf->buf.m.planes = avbuf->planes;
530 }
531
532 ✗ ret = ioctl(buf_to_m2mctx(avbuf)->fd, VIDIOC_QUERYBUF, &avbuf->buf);
533 ✗ if (ret < 0)
534 ✗ return AVERROR(errno);
535
536 ✗ if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
537 ✗ avbuf->num_planes = 0;
538 /* in MP, the V4L2 API states that buf.length means num_planes */
539 ✗ for (i = 0; i < avbuf->buf.length; i++) {
540 ✗ if (avbuf->buf.m.planes[i].length)
541 ✗ avbuf->num_planes++;
542 }
543 } else
544 ✗ avbuf->num_planes = 1;
545
546 ✗ for (i = 0; i < avbuf->num_planes; i++) {
547
548 ✗ avbuf->plane_info[i].bytesperline = V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ?
549 ✗ ctx->format.fmt.pix_mp.plane_fmt[i].bytesperline :
550 ✗ ctx->format.fmt.pix.bytesperline;
551
552 ✗ if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
553 ✗ avbuf->plane_info[i].length = avbuf->buf.m.planes[i].length;
554 ✗ avbuf->plane_info[i].mm_addr = mmap(NULL, avbuf->buf.m.planes[i].length,
555 PROT_READ | PROT_WRITE, MAP_SHARED,
556 ✗ buf_to_m2mctx(avbuf)->fd, avbuf->buf.m.planes[i].m.mem_offset);
557 } else {
558 ✗ avbuf->plane_info[i].length = avbuf->buf.length;
559 ✗ avbuf->plane_info[i].mm_addr = mmap(NULL, avbuf->buf.length,
560 PROT_READ | PROT_WRITE, MAP_SHARED,
561 ✗ buf_to_m2mctx(avbuf)->fd, avbuf->buf.m.offset);
562 }
563
564 ✗ if (avbuf->plane_info[i].mm_addr == MAP_FAILED)
565 ✗ return AVERROR(ENOMEM);
566 }
567
568 ✗ avbuf->status = V4L2BUF_AVAILABLE;
569
570 ✗ if (V4L2_TYPE_IS_OUTPUT(ctx->type))
571 ✗ return 0;
572
573 ✗ if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
574 ✗ avbuf->buf.m.planes = avbuf->planes;
575 ✗ avbuf->buf.length = avbuf->num_planes;
576
577 } else {
578 ✗ avbuf->buf.bytesused = avbuf->planes[0].bytesused;
579 ✗ avbuf->buf.length = avbuf->planes[0].length;
580 }
581
582 ✗ return ff_v4l2_buffer_enqueue(avbuf);
583 }
584
585 ✗ int ff_v4l2_buffer_enqueue(V4L2Buffer* avbuf)
586 {
587 int ret;
588
589 ✗ avbuf->buf.flags = avbuf->flags;
590
591 ✗ ret = ioctl(buf_to_m2mctx(avbuf)->fd, VIDIOC_QBUF, &avbuf->buf);
592 ✗ if (ret < 0)
593 ✗ return AVERROR(errno);
594
595 ✗ avbuf->status = V4L2BUF_IN_DRIVER;
596
597 ✗ return 0;
598 }
599