FFmpeg
v4l2_m2m_enc.c
Go to the documentation of this file.
1 /*
2  * V4L2 mem2mem encoders
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 <search.h>
27 #include "encode.h"
28 #include "libavcodec/avcodec.h"
29 #include "libavcodec/internal.h"
30 #include "libavutil/pixdesc.h"
31 #include "libavutil/pixfmt.h"
32 #include "libavutil/opt.h"
33 #include "profiles.h"
34 #include "v4l2_context.h"
35 #include "v4l2_m2m.h"
36 #include "v4l2_fmt.h"
37 
38 #define MPEG_CID(x) V4L2_CID_MPEG_VIDEO_##x
39 #define MPEG_VIDEO(x) V4L2_MPEG_VIDEO_##x
40 
41 static inline void v4l2_set_timeperframe(V4L2m2mContext *s, unsigned int num, unsigned int den)
42 {
43  struct v4l2_streamparm parm = { 0 };
44 
45  parm.type = V4L2_TYPE_IS_MULTIPLANAR(s->output.type) ? V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE : V4L2_BUF_TYPE_VIDEO_OUTPUT;
46  parm.parm.output.timeperframe.denominator = den;
47  parm.parm.output.timeperframe.numerator = num;
48 
49  if (ioctl(s->fd, VIDIOC_S_PARM, &parm) < 0)
50  av_log(s->avctx, AV_LOG_WARNING, "Failed to set timeperframe");
51 }
52 
53 static inline void v4l2_set_ext_ctrl(V4L2m2mContext *s, unsigned int id, signed int value, const char *name, int log_warning)
54 {
55  struct v4l2_ext_controls ctrls = { { 0 } };
56  struct v4l2_ext_control ctrl = { 0 };
57 
58  /* set ctrls */
59  ctrls.ctrl_class = V4L2_CTRL_CLASS_MPEG;
60  ctrls.controls = &ctrl;
61  ctrls.count = 1;
62 
63  /* set ctrl*/
64  ctrl.value = value;
65  ctrl.id = id;
66 
67  if (ioctl(s->fd, VIDIOC_S_EXT_CTRLS, &ctrls) < 0)
68  av_log(s->avctx, log_warning || errno != EINVAL ? AV_LOG_WARNING : AV_LOG_DEBUG,
69  "Failed to set %s: %s\n", name, strerror(errno));
70  else
71  av_log(s->avctx, AV_LOG_DEBUG, "Encoder: %s = %d\n", name, value);
72 }
73 
74 static inline int v4l2_get_ext_ctrl(V4L2m2mContext *s, unsigned int id, signed int *value, const char *name, int log_warning)
75 {
76  struct v4l2_ext_controls ctrls = { { 0 } };
77  struct v4l2_ext_control ctrl = { 0 };
78  int ret;
79 
80  /* set ctrls */
81  ctrls.ctrl_class = V4L2_CTRL_CLASS_MPEG;
82  ctrls.controls = &ctrl;
83  ctrls.count = 1;
84 
85  /* set ctrl*/
86  ctrl.id = id ;
87 
88  ret = ioctl(s->fd, VIDIOC_G_EXT_CTRLS, &ctrls);
89  if (ret < 0) {
90  av_log(s->avctx, log_warning || errno != EINVAL ? AV_LOG_WARNING : AV_LOG_DEBUG,
91  "Failed to get %s\n", name);
92  return ret;
93  }
94 
95  *value = ctrl.value;
96 
97  return 0;
98 }
99 
100 static inline unsigned int v4l2_h264_profile_from_ff(int p)
101 {
102  static const struct h264_profile {
103  unsigned int ffmpeg_val;
104  unsigned int v4l2_val;
105  } profile[] = {
106  { FF_PROFILE_H264_CONSTRAINED_BASELINE, MPEG_VIDEO(H264_PROFILE_CONSTRAINED_BASELINE) },
107  { FF_PROFILE_H264_HIGH_444_PREDICTIVE, MPEG_VIDEO(H264_PROFILE_HIGH_444_PREDICTIVE) },
108  { FF_PROFILE_H264_HIGH_422_INTRA, MPEG_VIDEO(H264_PROFILE_HIGH_422_INTRA) },
109  { FF_PROFILE_H264_HIGH_444_INTRA, MPEG_VIDEO(H264_PROFILE_HIGH_444_INTRA) },
110  { FF_PROFILE_H264_HIGH_10_INTRA, MPEG_VIDEO(H264_PROFILE_HIGH_10_INTRA) },
111  { FF_PROFILE_H264_HIGH_422, MPEG_VIDEO(H264_PROFILE_HIGH_422) },
112  { FF_PROFILE_H264_BASELINE, MPEG_VIDEO(H264_PROFILE_BASELINE) },
113  { FF_PROFILE_H264_EXTENDED, MPEG_VIDEO(H264_PROFILE_EXTENDED) },
114  { FF_PROFILE_H264_HIGH_10, MPEG_VIDEO(H264_PROFILE_HIGH_10) },
115  { FF_PROFILE_H264_MAIN, MPEG_VIDEO(H264_PROFILE_MAIN) },
116  { FF_PROFILE_H264_HIGH, MPEG_VIDEO(H264_PROFILE_HIGH) },
117  };
118  int i;
119 
120  for (i = 0; i < FF_ARRAY_ELEMS(profile); i++) {
121  if (profile[i].ffmpeg_val == p)
122  return profile[i].v4l2_val;
123  }
124  return AVERROR(ENOENT);
125 }
126 
127 static inline int v4l2_mpeg4_profile_from_ff(int p)
128 {
129  static const struct mpeg4_profile {
130  unsigned int ffmpeg_val;
131  unsigned int v4l2_val;
132  } profile[] = {
133  { FF_PROFILE_MPEG4_ADVANCED_CODING, MPEG_VIDEO(MPEG4_PROFILE_ADVANCED_CODING_EFFICIENCY) },
134  { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, MPEG_VIDEO(MPEG4_PROFILE_ADVANCED_SIMPLE) },
135  { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, MPEG_VIDEO(MPEG4_PROFILE_SIMPLE_SCALABLE) },
136  { FF_PROFILE_MPEG4_SIMPLE, MPEG_VIDEO(MPEG4_PROFILE_SIMPLE) },
137  { FF_PROFILE_MPEG4_CORE, MPEG_VIDEO(MPEG4_PROFILE_CORE) },
138  };
139  int i;
140 
141  for (i = 0; i < FF_ARRAY_ELEMS(profile); i++) {
142  if (profile[i].ffmpeg_val == p)
143  return profile[i].v4l2_val;
144  }
145  return AVERROR(ENOENT);
146 }
147 
149 {
150  if (s->avctx->max_b_frames)
151  av_log(s->avctx, AV_LOG_WARNING, "Encoder does not support b-frames yet\n");
152 
153  v4l2_set_ext_ctrl(s, MPEG_CID(B_FRAMES), 0, "number of B-frames", 0);
154  v4l2_get_ext_ctrl(s, MPEG_CID(B_FRAMES), &s->avctx->max_b_frames, "number of B-frames", 0);
155  if (s->avctx->max_b_frames == 0)
156  return 0;
157 
158  avpriv_report_missing_feature(s->avctx, "DTS/PTS calculation for V4L2 encoding");
159 
160  return AVERROR_PATCHWELCOME;
161 }
162 
164 {
165  struct v4l2_event_subscription sub;
166 
167  memset(&sub, 0, sizeof(sub));
168  sub.type = V4L2_EVENT_EOS;
169  if (ioctl(s->fd, VIDIOC_SUBSCRIBE_EVENT, &sub) < 0)
171  "the v4l2 driver does not support end of stream VIDIOC_SUBSCRIBE_EVENT\n");
172 }
173 
175 {
176  AVCodecContext *avctx = s->avctx;
177  int qmin_cid, qmax_cid, qmin, qmax;
178  int ret, val;
179 
180  /**
181  * requirements
182  */
184 
186  if (ret)
187  return ret;
188 
189  /**
190  * settingss
191  */
192  if (avctx->framerate.num || avctx->framerate.den)
193  v4l2_set_timeperframe(s, avctx->framerate.den, avctx->framerate.num);
194 
195  /* set ext ctrls */
196  v4l2_set_ext_ctrl(s, MPEG_CID(HEADER_MODE), MPEG_VIDEO(HEADER_MODE_SEPARATE), "header mode", 0);
197  v4l2_set_ext_ctrl(s, MPEG_CID(BITRATE) , avctx->bit_rate, "bit rate", 1);
198  v4l2_set_ext_ctrl(s, MPEG_CID(FRAME_RC_ENABLE), 1, "frame level rate control", 0);
199  v4l2_set_ext_ctrl(s, MPEG_CID(GOP_SIZE), avctx->gop_size,"gop size", 1);
200 
201  av_log(avctx, AV_LOG_DEBUG,
202  "Encoder Context: id (%d), profile (%d), frame rate(%d/%d), number b-frames (%d), "
203  "gop size (%d), bit rate (%"PRId64"), qmin (%d), qmax (%d)\n",
204  avctx->codec_id, avctx->profile, avctx->framerate.num, avctx->framerate.den,
205  avctx->max_b_frames, avctx->gop_size, avctx->bit_rate, avctx->qmin, avctx->qmax);
206 
207  switch (avctx->codec_id) {
208  case AV_CODEC_ID_H264:
209  if (avctx->profile != FF_PROFILE_UNKNOWN) {
210  val = v4l2_h264_profile_from_ff(avctx->profile);
211  if (val < 0)
212  av_log(avctx, AV_LOG_WARNING, "h264 profile not found\n");
213  else
214  v4l2_set_ext_ctrl(s, MPEG_CID(H264_PROFILE), val, "h264 profile", 1);
215  }
216  qmin_cid = MPEG_CID(H264_MIN_QP);
217  qmax_cid = MPEG_CID(H264_MAX_QP);
218  qmin = 0;
219  qmax = 51;
220  break;
221  case AV_CODEC_ID_MPEG4:
222  if (avctx->profile != FF_PROFILE_UNKNOWN) {
223  val = v4l2_mpeg4_profile_from_ff(avctx->profile);
224  if (val < 0)
225  av_log(avctx, AV_LOG_WARNING, "mpeg4 profile not found\n");
226  else
227  v4l2_set_ext_ctrl(s, MPEG_CID(MPEG4_PROFILE), val, "mpeg4 profile", 1);
228  }
229  qmin_cid = MPEG_CID(MPEG4_MIN_QP);
230  qmax_cid = MPEG_CID(MPEG4_MAX_QP);
231  if (avctx->flags & AV_CODEC_FLAG_QPEL)
232  v4l2_set_ext_ctrl(s, MPEG_CID(MPEG4_QPEL), 1, "qpel", 1);
233  qmin = 1;
234  qmax = 31;
235  break;
236  case AV_CODEC_ID_H263:
237  qmin_cid = MPEG_CID(H263_MIN_QP);
238  qmax_cid = MPEG_CID(H263_MAX_QP);
239  qmin = 1;
240  qmax = 31;
241  break;
242  case AV_CODEC_ID_VP8:
243  qmin_cid = MPEG_CID(VPX_MIN_QP);
244  qmax_cid = MPEG_CID(VPX_MAX_QP);
245  qmin = 0;
246  qmax = 127;
247  break;
248  case AV_CODEC_ID_VP9:
249  qmin_cid = MPEG_CID(VPX_MIN_QP);
250  qmax_cid = MPEG_CID(VPX_MAX_QP);
251  qmin = 0;
252  qmax = 255;
253  break;
254  default:
255  return 0;
256  }
257 
258  if (avctx->qmin >= 0 && avctx->qmax >= 0 && avctx->qmin > avctx->qmax) {
259  av_log(avctx, AV_LOG_WARNING, "Invalid qmin:%d qmax:%d. qmin should not "
260  "exceed qmax\n", avctx->qmin, avctx->qmax);
261  } else {
262  qmin = avctx->qmin >= 0 ? avctx->qmin : qmin;
263  qmax = avctx->qmax >= 0 ? avctx->qmax : qmax;
264  }
265 
266  v4l2_set_ext_ctrl(s, qmin_cid, qmin, "minimum video quantizer scale",
267  avctx->qmin >= 0);
268  v4l2_set_ext_ctrl(s, qmax_cid, qmax, "maximum video quantizer scale",
269  avctx->qmax >= 0);
270 
271  return 0;
272 }
273 
274 static int v4l2_send_frame(AVCodecContext *avctx, const AVFrame *frame)
275 {
276  V4L2m2mContext *s = ((V4L2m2mPriv*)avctx->priv_data)->context;
277  V4L2Context *const output = &s->output;
278 
279 #ifdef V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME
280  if (frame && frame->pict_type == AV_PICTURE_TYPE_I)
281  v4l2_set_ext_ctrl(s, MPEG_CID(FORCE_KEY_FRAME), 0, "force key frame", 1);
282 #endif
283 
284  return ff_v4l2_context_enqueue_frame(output, frame);
285 }
286 
287 static int v4l2_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
288 {
289  V4L2m2mContext *s = ((V4L2m2mPriv*)avctx->priv_data)->context;
290  V4L2Context *const capture = &s->capture;
291  V4L2Context *const output = &s->output;
292  AVFrame *frame = s->frame;
293  int ret;
294 
295  if (s->draining)
296  goto dequeue;
297 
298  if (!frame->buf[0]) {
299  ret = ff_encode_get_frame(avctx, frame);
300  if (ret < 0 && ret != AVERROR_EOF)
301  return ret;
302 
303  if (ret == AVERROR_EOF)
304  frame = NULL;
305  }
306 
307  ret = v4l2_send_frame(avctx, frame);
308  if (ret != AVERROR(EAGAIN))
309  av_frame_unref(frame);
310 
311  if (ret < 0 && ret != AVERROR(EAGAIN))
312  return ret;
313 
314  if (!output->streamon) {
315  ret = ff_v4l2_context_set_status(output, VIDIOC_STREAMON);
316  if (ret) {
317  av_log(avctx, AV_LOG_ERROR, "VIDIOC_STREAMON failed on output context\n");
318  return ret;
319  }
320  }
321 
322  if (!capture->streamon) {
323  ret = ff_v4l2_context_set_status(capture, VIDIOC_STREAMON);
324  if (ret) {
325  av_log(avctx, AV_LOG_ERROR, "VIDIOC_STREAMON failed on capture context\n");
326  return ret;
327  }
328  }
329 
330 dequeue:
331  return ff_v4l2_context_dequeue_packet(capture, avpkt);
332 }
333 
335 {
336  V4L2Context *capture, *output;
337  V4L2m2mContext *s;
338  V4L2m2mPriv *priv = avctx->priv_data;
339  enum AVPixelFormat pix_fmt_output;
340  uint32_t v4l2_fmt_output;
341  int ret;
342 
343  ret = ff_v4l2_m2m_create_context(priv, &s);
344  if (ret < 0)
345  return ret;
346 
347  capture = &s->capture;
348  output = &s->output;
349 
350  /* common settings output/capture */
351  output->height = capture->height = avctx->height;
352  output->width = capture->width = avctx->width;
353 
354  /* output context */
356  output->av_pix_fmt = avctx->pix_fmt;
357 
358  /* capture context */
359  capture->av_codec_id = avctx->codec_id;
360  capture->av_pix_fmt = AV_PIX_FMT_NONE;
361 
362  s->avctx = avctx;
363  ret = ff_v4l2_m2m_codec_init(priv);
364  if (ret) {
365  av_log(avctx, AV_LOG_ERROR, "can't configure encoder\n");
366  return ret;
367  }
368 
369  if (V4L2_TYPE_IS_MULTIPLANAR(output->type))
370  v4l2_fmt_output = output->format.fmt.pix_mp.pixelformat;
371  else
372  v4l2_fmt_output = output->format.fmt.pix.pixelformat;
373 
374  pix_fmt_output = ff_v4l2_format_v4l2_to_avfmt(v4l2_fmt_output, AV_CODEC_ID_RAWVIDEO);
375  if (pix_fmt_output != avctx->pix_fmt) {
376  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt_output);
377  av_log(avctx, AV_LOG_ERROR, "Encoder requires %s pixel format.\n", desc->name);
378  return AVERROR(EINVAL);
379  }
380 
381  return v4l2_prepare_encoder(s);
382 }
383 
385 {
386  return ff_v4l2_m2m_codec_end(avctx->priv_data);
387 }
388 
389 #define OFFSET(x) offsetof(V4L2m2mPriv, x)
390 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
391 
392 #define V4L_M2M_CAPTURE_OPTS \
393  V4L_M2M_DEFAULT_OPTS,\
394  { "num_capture_buffers", "Number of buffers in the capture context", \
395  OFFSET(num_capture_buffers), AV_OPT_TYPE_INT, {.i64 = 4 }, 4, INT_MAX, FLAGS }
396 
397 static const AVOption mpeg4_options[] = {
400  { NULL },
401 };
402 
403 static const AVOption options[] = {
405  { NULL },
406 };
407 
409  { "qmin", "-1" },
410  { "qmax", "-1" },
411  { NULL },
412 };
413 
414 #define M2MENC_CLASS(NAME, OPTIONS_NAME) \
415  static const AVClass v4l2_m2m_ ## NAME ## _enc_class = { \
416  .class_name = #NAME "_v4l2m2m_encoder", \
417  .item_name = av_default_item_name, \
418  .option = OPTIONS_NAME, \
419  .version = LIBAVUTIL_VERSION_INT, \
420  };
421 
422 #define M2MENC(NAME, LONGNAME, OPTIONS_NAME, CODEC) \
423  M2MENC_CLASS(NAME, OPTIONS_NAME) \
424  AVCodec ff_ ## NAME ## _v4l2m2m_encoder = { \
425  .name = #NAME "_v4l2m2m" , \
426  .long_name = NULL_IF_CONFIG_SMALL("V4L2 mem2mem " LONGNAME " encoder wrapper"), \
427  .type = AVMEDIA_TYPE_VIDEO, \
428  .id = CODEC , \
429  .priv_data_size = sizeof(V4L2m2mPriv), \
430  .priv_class = &v4l2_m2m_ ## NAME ##_enc_class, \
431  .init = v4l2_encode_init, \
432  .receive_packet = v4l2_receive_packet, \
433  .close = v4l2_encode_close, \
434  .defaults = v4l2_m2m_defaults, \
435  .capabilities = AV_CODEC_CAP_HARDWARE | AV_CODEC_CAP_DELAY, \
436  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, \
437  .wrapper_name = "v4l2m2m", \
438  }
439 
440 M2MENC(mpeg4,"MPEG4", mpeg4_options, AV_CODEC_ID_MPEG4);
441 M2MENC(h263, "H.263", options, AV_CODEC_ID_H263);
442 M2MENC(h264, "H.264", options, AV_CODEC_ID_H264);
443 M2MENC(hevc, "HEVC", options, AV_CODEC_ID_HEVC);
444 M2MENC(vp8, "VP8", options, AV_CODEC_ID_VP8);
#define FF_PROFILE_H264_MAIN
Definition: avcodec.h:1900
enum AVPixelFormat ff_v4l2_format_v4l2_to_avfmt(uint32_t v4l2_fmt, enum AVCodecID avcodec)
Definition: v4l2_fmt.c:132
#define FF_PROFILE_MPEG4_SIMPLE
Definition: avcodec.h:1919
#define NULL
Definition: coverity.c:32
AVRational framerate
Definition: avcodec.h:2069
static const AVOption options[]
Definition: v4l2_m2m_enc.c:403
static const AVCodecDefault v4l2_m2m_defaults[]
Definition: v4l2_m2m_enc.c:408
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2573
This structure describes decoded (raw) audio or video data.
Definition: frame.h:308
static int v4l2_get_ext_ctrl(V4L2m2mContext *s, unsigned int id, signed int *value, const char *name, int log_warning)
Definition: v4l2_m2m_enc.c:74
static const AVOption mpeg4_options[]
Definition: v4l2_m2m_enc.c:397
AVOption.
Definition: opt.h:248
AVCodecContext * avctx
Definition: v4l2_m2m.h:52
const char * desc
Definition: libsvtav1.c:79
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
int64_t bit_rate
the average bitrate
Definition: avcodec.h:576
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:499
int max_b_frames
maximum number of B-frames between non-B-frames Note: The output will be delayed by max_b_frames+1 re...
Definition: avcodec.h:786
static int v4l2_mpeg4_profile_from_ff(int p)
Definition: v4l2_m2m_enc.c:127
int num
Numerator.
Definition: rational.h:59
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
static void v4l2_set_ext_ctrl(V4L2m2mContext *s, unsigned int id, signed int value, const char *name, int log_warning)
Definition: v4l2_m2m_enc.c:53
int width
Width and height of the frames it produces (in case of a capture context, e.g.
Definition: v4l2_context.h:71
#define MPEG_VIDEO(x)
Definition: v4l2_m2m_enc.c:39
#define FF_PROFILE_MPEG4_SIMPLE_SCALABLE
Definition: avcodec.h:1920
int ff_v4l2_m2m_codec_end(V4L2m2mPriv *priv)
Releases all the codec resources if all AVBufferRefs have been returned to the ctx.
Definition: v4l2_m2m.c:339
int ff_v4l2_context_dequeue_packet(V4L2Context *ctx, AVPacket *pkt)
Dequeues a buffer from a V4L2Context to an AVPacket.
Definition: v4l2_context.c:656
int profile
profile
Definition: avcodec.h:1859
static int v4l2_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
Definition: v4l2_m2m_enc.c:287
static av_cold int v4l2_encode_init(AVCodecContext *avctx)
Definition: v4l2_m2m_enc.c:334
#define FF_PROFILE_H264_HIGH_444_PREDICTIVE
Definition: avcodec.h:1910
int ff_v4l2_m2m_codec_init(V4L2m2mPriv *priv)
Probes the video nodes looking for the required codec capabilities.
Definition: v4l2_m2m.c:365
enum AVCodecID av_codec_id
AVCodecID corresponding to this buffer context.
Definition: v4l2_context.h:59
#define FF_PROFILE_H264_BASELINE
Definition: avcodec.h:1898
int ff_v4l2_m2m_create_context(V4L2m2mPriv *priv, V4L2m2mContext **s)
Allocate a new context and references for a V4L2 M2M instance.
Definition: v4l2_m2m.c:403
#define av_cold
Definition: attributes.h:88
#define FF_PROFILE_MPEG4_CORE
Definition: avcodec.h:1921
AVOptions.
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:108
static int v4l2_send_frame(AVCodecContext *avctx, const AVFrame *frame)
Definition: v4l2_m2m_enc.c:274
#define AVERROR_EOF
End of file.
Definition: error.h:55
static void v4l2_set_timeperframe(V4L2m2mContext *s, unsigned int num, unsigned int den)
Definition: v4l2_m2m_enc.c:41
#define FF_PROFILE_H264_EXTENDED
Definition: avcodec.h:1901
#define av_log(a,...)
const char * name
Definition: pixdesc.h:82
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
static av_cold int v4l2_encode_close(AVCodecContext *avctx)
Definition: v4l2_m2m_enc.c:384
int qmax
maximum quantizer
Definition: avcodec.h:1375
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define FF_PROFILE_H264_HIGH_422
Definition: avcodec.h:1906
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:606
#define FF_PROFILE_H264_HIGH
Definition: avcodec.h:1902
enum AVPixelFormat av_pix_fmt
AVPixelFormat corresponding to this buffer context.
Definition: v4l2_context.h:53
AVFrame * frame
Definition: v4l2_m2m.h:62
int streamon
Whether the stream has been started (VIDIOC_STREAMON has been sent).
Definition: v4l2_context.h:87
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:391
static int v4l2_check_b_frame_support(V4L2m2mContext *s)
Definition: v4l2_m2m_enc.c:148
int width
picture width / height.
Definition: avcodec.h:699
#define FF_PROFILE_UNKNOWN
Definition: avcodec.h:1860
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
#define s(width, name)
Definition: cbs_vp9.c:257
#define FF_MPEG4_PROFILE_OPTS
Definition: profiles.h:40
#define FF_ARRAY_ELEMS(a)
struct v4l2_format format
Format returned by the driver after initializing the buffer context.
Definition: v4l2_context.h:65
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
int ff_v4l2_context_set_status(V4L2Context *ctx, uint32_t cmd)
Sets the status of a V4L2Context.
Definition: v4l2_context.c:572
V4L2Context capture
Definition: v4l2_m2m.h:48
Libavcodec external API header.
static void v4l2_subscribe_eos_event(V4L2m2mContext *s)
Definition: v4l2_m2m_enc.c:163
#define FF_PROFILE_H264_HIGH_422_INTRA
Definition: avcodec.h:1907
enum AVCodecID codec_id
Definition: avcodec.h:536
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
main external API structure.
Definition: avcodec.h:526
#define FF_PROFILE_MPEG4_ADVANCED_SIMPLE
Definition: avcodec.h:1934
int qmin
minimum quantizer
Definition: avcodec.h:1368
#define V4L_M2M_CAPTURE_OPTS
Definition: v4l2_m2m_enc.c:392
#define FF_PROFILE_H264_HIGH_10_INTRA
Definition: avcodec.h:1904
#define FF_PROFILE_MPEG4_ADVANCED_CODING
Definition: avcodec.h:1930
mfxU16 profile
Definition: qsvenc.c:45
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:566
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
V4L2Context output
Definition: v4l2_m2m.h:49
#define AV_CODEC_FLAG_QPEL
Use qpel MC.
Definition: avcodec.h:287
int gop_size
the number of pictures in a group of pictures, or 0 for intra_only
Definition: avcodec.h:721
int ff_v4l2_context_enqueue_frame(V4L2Context *ctx, const AVFrame *frame)
Enqueues a buffer to a V4L2Context from an AVFrame.
Definition: v4l2_context.c:586
common internal api header.
#define M2MENC(NAME, LONGNAME, OPTIONS_NAME, CODEC)
Definition: v4l2_m2m_enc.c:422
int den
Denominator.
Definition: rational.h:60
#define MPEG_CID(x)
Definition: v4l2_m2m_enc.c:38
static int v4l2_prepare_encoder(V4L2m2mContext *s)
Definition: v4l2_m2m_enc.c:174
void * priv_data
Definition: avcodec.h:553
pixel format definitions
static unsigned int v4l2_h264_profile_from_ff(int p)
Definition: v4l2_m2m_enc.c:100
#define FF_PROFILE_H264_HIGH_444_INTRA
Definition: avcodec.h:1911
#define FF_PROFILE_H264_CONSTRAINED_BASELINE
Definition: avcodec.h:1899
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
#define FF_PROFILE_H264_HIGH_10
Definition: avcodec.h:1903
enum AVCodecID id
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
static double val(void *priv, double ch)
Definition: aeval.c:76
This structure stores compressed data.
Definition: packet.h:340
int i
Definition: input.c:407
enum v4l2_buf_type type
Type of this buffer context.
Definition: v4l2_context.h:47
int ff_encode_get_frame(AVCodecContext *avctx, AVFrame *frame)
Called by encoders to get the next frame for encoding.
Definition: encode.c:107
const char * name
Definition: opengl_enc.c:102