FFmpeg
buffersrc.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2008 Vitor Sessak
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * memory buffer source filter
24  */
25 
26 #include <float.h>
27 
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/frame.h"
30 #include "libavutil/hwcontext.h"
31 #include "libavutil/internal.h"
32 #include "libavutil/mem.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/pixdesc.h"
35 #include "libavutil/samplefmt.h"
36 #include "libavutil/timestamp.h"
37 #include "avfilter.h"
38 #include "avfilter_internal.h"
39 #include "buffersrc.h"
40 #include "filters.h"
41 #include "formats.h"
42 #include "video.h"
43 
44 typedef struct BufferSourceContext {
45  const AVClass *class;
46  AVRational time_base; ///< time_base to set in the output link
47  AVRational frame_rate; ///< frame_rate to set in the output link
48  unsigned nb_failed_requests;
49 
50  /* video only */
51  int w, h, prev_w, prev_h;
52  enum AVPixelFormat pix_fmt, prev_pix_fmt;
53  enum AVColorSpace color_space, prev_color_space;
54  enum AVColorRange color_range, prev_color_range;
55  AVRational pixel_aspect;
56 
57  AVBufferRef *hw_frames_ctx;
58 
59  /* audio only */
60  int sample_rate;
61  enum AVSampleFormat sample_fmt;
62  int channels;
63  char *channel_layout_str;
64  AVChannelLayout ch_layout;
65 
66  int eof;
67  int64_t last_pts;
68  int link_delta, prev_delta;
69 } BufferSourceContext;
70 
71 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, csp, range, pts)\
72  c->link_delta = c->w != width || c->h != height || c->pix_fmt != format ||\
73  c->color_space != csp || c->color_range != range;\
74  c->prev_delta = c->prev_w != width || c->prev_h != height || c->prev_pix_fmt != format ||\
75  c->prev_color_space != csp || c->prev_color_range != range;\
76  if (c->link_delta) {\
77  int loglevel = c->prev_delta ? AV_LOG_WARNING : AV_LOG_DEBUG;\
78  av_log(s, loglevel, "Changing video frame properties on the fly is not supported by all filters.\n");\
79  av_log(s, loglevel, "filter context - w: %d h: %d fmt: %d csp: %s range: %s, incoming frame - w: %d h: %d fmt: %d csp: %s range: %s pts_time: %s\n",\
80  c->w, c->h, c->pix_fmt, av_color_space_name(c->color_space), av_color_range_name(c->color_range),\
81  width, height, format, av_color_space_name(csp), av_color_range_name(range),\
82  av_ts2timestr(pts, &s->outputs[0]->time_base));\
83  }\
84  if (c->prev_delta) {\
85  if (!c->link_delta)\
86  av_log(s, AV_LOG_VERBOSE, "video frame properties congruent with link at pts_time: %s\n", av_ts2timestr(pts, &s->outputs[0]->time_base));\
87  c->prev_w = width;\
88  c->prev_h = height;\
89  c->prev_pix_fmt = format;\
90  c->prev_color_space = csp;\
91  c->prev_color_range = range;\
92  }
93 
94 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, layout, format, pts)\
95  if (c->sample_fmt != format || c->sample_rate != srate ||\
96  av_channel_layout_compare(&c->ch_layout, &layout) || c->channels != layout.nb_channels) {\
97  av_log(s, AV_LOG_INFO, "filter context - fmt: %s r: %d layout: %"PRIX64" ch: %d, incoming frame - fmt: %s r: %d layout: %"PRIX64" ch: %d pts_time: %s\n",\
98  av_get_sample_fmt_name(c->sample_fmt), c->sample_rate, c->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ? c->ch_layout.u.mask : 0, c->channels,\
99  av_get_sample_fmt_name(format), srate, layout.order == AV_CHANNEL_ORDER_NATIVE ? layout.u.mask : 0, layout.nb_channels, av_ts2timestr(pts, &s->outputs[0]->time_base));\
100  av_log(s, AV_LOG_ERROR, "Changing audio frame properties on the fly is not supported.\n");\
101  return AVERROR(EINVAL);\
102  }
103 
104 AVBufferSrcParameters *av_buffersrc_parameters_alloc(void)
105 {
106  AVBufferSrcParameters *par = av_mallocz(sizeof(*par));
107  if (!par)
108  return NULL;
109 
110  par->format = -1;
111  par->color_range = AVCOL_RANGE_UNSPECIFIED;
112  par->color_space = AVCOL_SPC_UNSPECIFIED;
113 
114  return par;
115 }
116 
117 int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param)
118 {
119  BufferSourceContext *s = ctx->priv;
120 
121  if (param->time_base.num > 0 && param->time_base.den > 0)
122  s->time_base = param->time_base;
123 
124  switch (ctx->filter->outputs[0].type) {
125  case AVMEDIA_TYPE_VIDEO:
126  if (param->format != AV_PIX_FMT_NONE) {
127  s->pix_fmt = s->prev_pix_fmt = param->format;
128  }
129  if (param->width > 0)
130  s->w = s->prev_w = param->width;
131  if (param->height > 0)
132  s->h = s->prev_h = param->height;
133  if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)
134  s->pixel_aspect = param->sample_aspect_ratio;
135  if (param->frame_rate.num > 0 && param->frame_rate.den > 0)
136  s->frame_rate = param->frame_rate;
137  if (param->hw_frames_ctx) {
138  av_buffer_unref(&s->hw_frames_ctx);
139  s->hw_frames_ctx = av_buffer_ref(param->hw_frames_ctx);
140  if (!s->hw_frames_ctx)
141  return AVERROR(ENOMEM);
142  }
143  if (param->color_space != AVCOL_SPC_UNSPECIFIED)
144  s->color_space = s->prev_color_space = param->color_space;
145  if (param->color_range != AVCOL_RANGE_UNSPECIFIED)
146  s->color_range = s->prev_color_range = param->color_range;
147  break;
148  case AVMEDIA_TYPE_AUDIO:
149  if (param->format != AV_SAMPLE_FMT_NONE) {
150  s->sample_fmt = param->format;
151  }
152  if (param->sample_rate > 0)
153  s->sample_rate = param->sample_rate;
154  if (param->ch_layout.nb_channels) {
155  int ret = av_channel_layout_copy(&s->ch_layout, &param->ch_layout);
156  if (ret < 0)
157  return ret;
158  }
159  break;
160  default:
161  return AVERROR_BUG;
162  }
163 
164  return 0;
165 }
166 
167 int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
168 {
169  return av_buffersrc_add_frame_flags(ctx, (AVFrame *)frame,
170  AV_BUFFERSRC_FLAG_KEEP_REF);
171 }
172 
173 int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
174 {
175  return av_buffersrc_add_frame_flags(ctx, frame, 0);
176 }
177 
178 static int push_frame(AVFilterGraph *graph)
179 {
180  int ret;
181 
182  while (1) {
183  ret = ff_filter_graph_run_once(graph);
184  if (ret == AVERROR(EAGAIN))
185  break;
186  if (ret < 0)
187  return ret;
188  }
189  return 0;
190 }
191 
192 int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
193 {
194  BufferSourceContext *s = ctx->priv;
195  AVFrame *copy;
196  int refcounted, ret;
197 
198  s->nb_failed_requests = 0;
199 
200  if (!frame)
201  return av_buffersrc_close(ctx, s->last_pts, flags);
202  if (s->eof)
203  return AVERROR_EOF;
204 
205  s->last_pts = frame->pts + frame->duration;
206 
207  refcounted = !!frame->buf[0];
208 
209  if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
210 
211  switch (ctx->outputs[0]->type) {
212  case AVMEDIA_TYPE_VIDEO:
213  CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
214  frame->format, frame->colorspace,
215  frame->color_range, frame->pts);
216  break;
217  case AVMEDIA_TYPE_AUDIO:
218  /* For layouts unknown on input but known on link after negotiation. */
219  if (frame->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC && frame->ch_layout.nb_channels == s->ch_layout.nb_channels) {
220  ret = av_channel_layout_copy(&frame->ch_layout, &s->ch_layout);
221  if (ret < 0)
222  return ret;
223  }
224  CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->ch_layout,
225  frame->format, frame->pts);
226  break;
227  default:
228  return AVERROR(EINVAL);
229  }
230 
231  }
232 
233  if (refcounted && !(flags & AV_BUFFERSRC_FLAG_KEEP_REF)) {
234  if (!(copy = av_frame_alloc()))
235  return AVERROR(ENOMEM);
236  av_frame_move_ref(copy, frame);
237  } else {
238  copy = av_frame_clone(frame);
239  if (!copy)
240  return AVERROR(ENOMEM);
241  }
242 
243 #if FF_API_INTERLACED_FRAME
244 FF_DISABLE_DEPRECATION_WARNINGS
245  if (copy->interlaced_frame)
246  copy->flags |= AV_FRAME_FLAG_INTERLACED;
247  if (copy->top_field_first)
248  copy->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
249 FF_ENABLE_DEPRECATION_WARNINGS
250 #endif
251 
252 #if FF_API_FRAME_KEY
253 FF_DISABLE_DEPRECATION_WARNINGS
254  if (copy->key_frame)
255  copy->flags |= AV_FRAME_FLAG_KEY;
256 FF_ENABLE_DEPRECATION_WARNINGS
257 #endif
258 
259  if (copy->colorspace == AVCOL_SPC_UNSPECIFIED)
260  copy->colorspace = ctx->outputs[0]->colorspace;
261  if (copy->color_range == AVCOL_RANGE_UNSPECIFIED)
262  copy->color_range = ctx->outputs[0]->color_range;
263 
264  ret = ff_filter_frame(ctx->outputs[0], copy);
265  if (ret < 0)
266  return ret;
267 
268  if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {
269  ret = push_frame(ctx->graph);
270  if (ret < 0)
271  return ret;
272  }
273 
274  return 0;
275 }
276 
277 int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags)
278 {
279  BufferSourceContext *s = ctx->priv;
280 
281  s->eof = 1;
282  ff_avfilter_link_set_in_status(ctx->outputs[0], AVERROR_EOF, pts);
283  return (flags & AV_BUFFERSRC_FLAG_PUSH) ? push_frame(ctx->graph) : 0;
284 }
285 
286 static av_cold int init_video(AVFilterContext *ctx)
287 {
288  BufferSourceContext *c = ctx->priv;
289 
290  if (c->pix_fmt == AV_PIX_FMT_NONE) {
291  av_log(ctx, AV_LOG_ERROR, "Unspecified pixel format\n");
292  return AVERROR(EINVAL);
293  }
294  if (av_pix_fmt_desc_get(c->pix_fmt)->flags & AV_PIX_FMT_FLAG_HWACCEL) {
295  if (!c->hw_frames_ctx) {
296  av_log(ctx, AV_LOG_ERROR, "Setting BufferSourceContext.pix_fmt "
297  "to a HW format requires hw_frames_ctx to be non-NULL!\n");
298  return AVERROR(EINVAL);
299  }
300  }
301  if (c->w <= 0 || c->h <= 0) {
302  av_log(ctx, AV_LOG_ERROR, "Invalid size %dx%d\n", c->w, c->h);
303  return AVERROR(EINVAL);
304  }
305  if (av_q2d(c->time_base) <= 0) {
306  av_log(ctx, AV_LOG_ERROR, "Invalid time base %d/%d\n", c->time_base.num, c->time_base.den);
307  return AVERROR(EINVAL);
308  }
309 
310  av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s tb:%d/%d fr:%d/%d sar:%d/%d csp:%s range:%s\n",
311  c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
312  c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
313  c->pixel_aspect.num, c->pixel_aspect.den,
314  av_color_space_name(c->color_space), av_color_range_name(c->color_range));
315 
316  return 0;
317 }
318 
319 unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
320 {
321  return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
322 }
323 
324 #define OFFSET(x) offsetof(BufferSourceContext, x)
325 #define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
326 #define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
327 
328 static const AVOption buffer_options[] = {
329  { "width", NULL, OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
330  { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = V },
331  { "height", NULL, OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
332  { "pix_fmt", NULL, OFFSET(pix_fmt), AV_OPT_TYPE_PIXEL_FMT, { .i64 = AV_PIX_FMT_NONE }, .min = AV_PIX_FMT_NONE, .max = INT_MAX, .flags = V },
333  { "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
334  { "pixel_aspect", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
335  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
336  { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
337  { "colorspace", "select colorspace", OFFSET(color_space), AV_OPT_TYPE_INT, {.i64=AVCOL_SPC_UNSPECIFIED}, 0, AVCOL_SPC_NB-1, V, .unit = "colorspace"},
338  { "gbr", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_RGB}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
339  { "bt709", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT709}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
340  { "unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_UNSPECIFIED}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
341  { "fcc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_FCC}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
342  { "bt470bg", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT470BG}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
343  { "smpte170m", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_SMPTE170M}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
344  { "smpte240m", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_SMPTE240M}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
345  { "ycgco", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_YCGCO}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
346  { "ycgco-re", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_YCGCO_RE}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
347  { "ycgco-ro", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_YCGCO_RO}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
348  { "bt2020nc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT2020_NCL}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
349  { "bt2020c", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT2020_CL}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
350  { "smpte2085", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_SMPTE2085}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
351  { "chroma-derived-nc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_CHROMA_DERIVED_NCL},INT_MIN, INT_MAX, V, .unit = "colorspace"},
352  { "chroma-derived-c", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_CHROMA_DERIVED_CL}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
353  { "ictcp", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_ICTCP}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
354  { "ipt-c2", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_IPT_C2}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
355  { "range", "select color range", OFFSET(color_range), AV_OPT_TYPE_INT, {.i64=AVCOL_RANGE_UNSPECIFIED}, 0, AVCOL_RANGE_NB-1, V, .unit = "range"},
356  { "unspecified", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_UNSPECIFIED}, 0, 0, V, .unit = "range"},
357  { "unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_UNSPECIFIED}, 0, 0, V, .unit = "range"},
358  { "limited", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG}, 0, 0, V, .unit = "range"},
359  { "tv", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG}, 0, 0, V, .unit = "range"},
360  { "mpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG}, 0, 0, V, .unit = "range"},
361  { "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG}, 0, 0, V, .unit = "range"},
362  { "pc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG}, 0, 0, V, .unit = "range"},
363  { "jpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG}, 0, 0, V, .unit = "range"},
364  { NULL },
365 };
366 
367 AVFILTER_DEFINE_CLASS(buffer);
368 
369 static const AVOption abuffer_options[] = {
370  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
371  { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
372  { "sample_fmt", NULL, OFFSET(sample_fmt), AV_OPT_TYPE_SAMPLE_FMT, { .i64 = AV_SAMPLE_FMT_NONE }, .min = AV_SAMPLE_FMT_NONE, .max = INT_MAX, .flags = A },
373  { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
374  { "channels", NULL, OFFSET(channels), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
375  { NULL },
376 };
377 
378 AVFILTER_DEFINE_CLASS(abuffer);
379 
380 static av_cold int init_audio(AVFilterContext *ctx)
381 {
382  BufferSourceContext *s = ctx->priv;
383  char buf[128];
384  int ret = 0;
385 
386  if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
387  av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");
388  return AVERROR(EINVAL);
389  }
390 
391  if (s->channel_layout_str || s->ch_layout.nb_channels) {
392  int n;
393 
394  if (!s->ch_layout.nb_channels) {
395  ret = av_channel_layout_from_string(&s->ch_layout, s->channel_layout_str);
396  if (ret < 0) {
397  av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
398  s->channel_layout_str);
399  return AVERROR(EINVAL);
400  }
401  }
402 
403  n = s->ch_layout.nb_channels;
404  av_channel_layout_describe(&s->ch_layout, buf, sizeof(buf));
405  if (s->channels) {
406  if (n != s->channels) {
407  av_log(ctx, AV_LOG_ERROR,
408  "Mismatching channel count %d and layout '%s' "
409  "(%d channels)\n",
410  s->channels, buf, n);
411  return AVERROR(EINVAL);
412  }
413  }
414  s->channels = n;
415  } else if (!s->channels) {
416  av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
417  "channel layout specified\n");
418  return AVERROR(EINVAL);
419  } else {
420  s->ch_layout = FF_COUNT2LAYOUT(s->channels);
421  av_channel_layout_describe(&s->ch_layout, buf, sizeof(buf));
422  }
423 
424  if (!s->time_base.num)
425  s->time_base = (AVRational){1, s->sample_rate};
426 
427  av_log(ctx, AV_LOG_VERBOSE,
428  "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
429  s->time_base.num, s->time_base.den, av_get_sample_fmt_name(s->sample_fmt),
430  s->sample_rate, buf);
431 
432  return ret;
433 }
434 
435 static av_cold void uninit(AVFilterContext *ctx)
436 {
437  BufferSourceContext *s = ctx->priv;
438  av_buffer_unref(&s->hw_frames_ctx);
439  av_channel_layout_uninit(&s->ch_layout);
440 }
441 
442 static int query_formats(const AVFilterContext *ctx,
443  AVFilterFormatsConfig **cfg_in,
444  AVFilterFormatsConfig **cfg_out)
445 {
446  const BufferSourceContext *c = ctx->priv;
447  AVFilterChannelLayouts *channel_layouts = NULL;
448  AVFilterFormats *formats = NULL;
449  AVFilterFormats *samplerates = NULL;
450  AVFilterFormats *color_spaces = NULL;
451  AVFilterFormats *color_ranges = NULL;
452  int ret;
453 
454  switch (ctx->outputs[0]->type) {
455  case AVMEDIA_TYPE_VIDEO: {
456  enum AVPixelFormat swfmt = c->pix_fmt;
457  if (av_pix_fmt_desc_get(swfmt)->flags & AV_PIX_FMT_FLAG_HWACCEL)
458  swfmt = ((AVHWFramesContext *) c->hw_frames_ctx->data)->sw_format;
459  if ((ret = ff_add_format (&formats, c->pix_fmt)) < 0 ||
460  (ret = ff_set_common_formats2(ctx, cfg_in, cfg_out, formats)) < 0)
461  return ret;
462  /* force specific colorspace/range downstream only for ordinary YUV */
463  if (ff_fmt_is_regular_yuv(swfmt)) {
464  if ((ret = ff_add_format(&color_spaces, c->color_space)) < 0 ||
465  (ret = ff_set_common_color_spaces2(ctx, cfg_in, cfg_out, color_spaces)) < 0)
466  return ret;
467  if (ff_fmt_is_forced_full_range(swfmt)) {
468  if ((ret = ff_add_format(&color_ranges, AVCOL_RANGE_JPEG)) < 0)
469  return ret;
470  } else {
471  if ((ret = ff_add_format(&color_ranges, c->color_range)) < 0)
472  return ret;
473  if (c->color_range == AVCOL_RANGE_UNSPECIFIED) {
474  /* allow implicitly promoting unspecified to mpeg */
475  if ((ret = ff_add_format(&color_ranges, AVCOL_RANGE_MPEG)) < 0)
476  return ret;
477  }
478  }
479  if ((ret = ff_set_common_color_ranges2(ctx, cfg_in, cfg_out, color_ranges)) < 0)
480  return ret;
481  }
482  break;
483  }
484  case AVMEDIA_TYPE_AUDIO:
485  if ((ret = ff_add_format (&formats , c->sample_fmt )) < 0 ||
486  (ret = ff_set_common_formats2 (ctx, cfg_in, cfg_out, formats)) < 0 ||
487  (ret = ff_add_format (&samplerates, c->sample_rate)) < 0 ||
488  (ret = ff_set_common_samplerates2(ctx, cfg_in, cfg_out, samplerates)) < 0)
489  return ret;
490 
491  if ((ret = ff_add_channel_layout(&channel_layouts, &c->ch_layout)) < 0)
492  return ret;
493  if ((ret = ff_set_common_channel_layouts2(ctx, cfg_in, cfg_out, channel_layouts)) < 0)
494  return ret;
495  break;
496  default:
497  return AVERROR(EINVAL);
498  }
499 
500  return 0;
501 }
502 
503 static int config_props(AVFilterLink *link)
504 {
505  FilterLink *l = ff_filter_link(link);
506  BufferSourceContext *c = link->src->priv;
507 
508  switch (link->type) {
509  case AVMEDIA_TYPE_VIDEO:
510  link->w = c->w;
511  link->h = c->h;
512  link->sample_aspect_ratio = c->pixel_aspect;
513 
514  if (c->hw_frames_ctx) {
515  l->hw_frames_ctx = av_buffer_ref(c->hw_frames_ctx);
516  if (!l->hw_frames_ctx)
517  return AVERROR(ENOMEM);
518  }
519  break;
520  case AVMEDIA_TYPE_AUDIO:
521  if (!c->ch_layout.nb_channels || c->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC) {
522  int ret = av_channel_layout_copy(&c->ch_layout, &link->ch_layout);
523  if (ret < 0)
524  return ret;
525  }
526  break;
527  default:
528  return AVERROR(EINVAL);
529  }
530 
531  link->time_base = c->time_base;
532  l->frame_rate = c->frame_rate;
533  return 0;
534 }
535 
536 static int activate(AVFilterContext *ctx)
537 {
538  AVFilterLink *outlink = ctx->outputs[0];
539  BufferSourceContext *c = ctx->priv;
540 
541  if (!c->eof && ff_outlink_get_status(outlink)) {
542  c->eof = 1;
543  return 0;
544  }
545 
546  if (c->eof) {
547  ff_outlink_set_status(outlink, AVERROR_EOF, c->last_pts);
548  return 0;
549  }
550  c->nb_failed_requests++;
551  return FFERROR_NOT_READY;
552 }
553 
554 static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {
555  {
556  .name = "default",
557  .type = AVMEDIA_TYPE_VIDEO,
558  .config_props = config_props,
559  },
560 };
561 
562 const AVFilter ff_vsrc_buffer = {
563  .name = "buffer",
564  .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
565  .priv_size = sizeof(BufferSourceContext),
566  .activate = activate,
567  .init = init_video,
568  .uninit = uninit,
569 
570  .inputs = NULL,
571  FILTER_OUTPUTS(avfilter_vsrc_buffer_outputs),
572  FILTER_QUERY_FUNC2(query_formats),
573  .priv_class = &buffer_class,
574 };
575 
576 static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {
577  {
578  .name = "default",
579  .type = AVMEDIA_TYPE_AUDIO,
580  .config_props = config_props,
581  },
582 };
583 
584 const AVFilter ff_asrc_abuffer = {
585  .name = "abuffer",
586  .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
587  .priv_size = sizeof(BufferSourceContext),
588  .activate = activate,
589  .init = init_audio,
590  .uninit = uninit,
591 
592  .inputs = NULL,
593  FILTER_OUTPUTS(avfilter_asrc_abuffer_outputs),
594  FILTER_QUERY_FUNC2(query_formats),
595  .priv_class = &abuffer_class,
596 };
formats
formats
Definition: signature.h:47
AVBufferSrcParameters::color_space
enum AVColorSpace color_space
Video only, the YUV colorspace and range.
Definition: buffersrc.h:121
ff_filter_graph_run_once
int ff_filter_graph_run_once(AVFilterGraph *graph)
Run one round of processing on a filter graph.
Definition: avfiltergraph.c:1472
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:73
AVFilterChannelLayouts
A list of supported channel layouts.
Definition: formats.h:85
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:71
AVERROR
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
opt.h
AV_OPT_TYPE_SAMPLE_FMT
@ AV_OPT_TYPE_SAMPLE_FMT
Underlying C type is enum AVSampleFormat.
Definition: opt.h:311
ff_set_common_channel_layouts2
int ff_set_common_channel_layouts2(const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out, AVFilterChannelLayouts *channel_layouts)
Helpers for query_formats2() which set all free audio links to the same list of channel layouts/sampl...
Definition: formats.c:911
query_formats
static int query_formats(const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
Definition: buffersrc.c:442
ff_set_common_color_ranges2
int ff_set_common_color_ranges2(const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out, AVFilterFormats *color_ranges)
Definition: formats.c:983
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(buffer)
AVCOL_SPC_YCGCO_RE
@ AVCOL_SPC_YCGCO_RE
YCgCo-R, even addition of bits.
Definition: pixfmt.h:658
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1061
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:3170
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
FFERROR_NOT_READY
return FFERROR_NOT_READY
Definition: filter_design.txt:204
ff_set_common_formats2
int ff_set_common_formats2(const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out, AVFilterFormats *formats)
Definition: formats.c:1007
int64_t
long long int64_t
Definition: coverity.c:34
A
#define A
Definition: buffersrc.c:325
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:389
pixdesc.h
w
uint8_t w
Definition: llviddspenc.c:38
AVCOL_RANGE_JPEG
@ AVCOL_RANGE_JPEG
Full range content.
Definition: pixfmt.h:717
AVOption
AVOption.
Definition: opt.h:429
AVCOL_SPC_NB
@ AVCOL_SPC_NB
Not part of ABI.
Definition: pixfmt.h:660
av_buffersrc_add_frame
int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
Add a frame to the buffer source.
Definition: buffersrc.c:173
OFFSET
#define OFFSET(x)
Definition: buffersrc.c:324
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:225
AVCOL_SPC_RGB
@ AVCOL_SPC_RGB
order of coefficients is actually GBR, also IEC 61966-2-1 (sRGB), YZX and ST 428-1
Definition: pixfmt.h:641
float.h
CHECK_AUDIO_PARAM_CHANGE
#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, layout, format, pts)
Definition: buffersrc.c:94
av_buffer_ref
AVBufferRef * av_buffer_ref(const AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:103
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:205
BufferSourceContext::channels
int channels
Definition: buffersrc.c:62
AV_OPT_TYPE_RATIONAL
@ AV_OPT_TYPE_RATIONAL
Underlying C type is AVRational.
Definition: opt.h:280
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:327
abuffer_options
static const AVOption abuffer_options[]
Definition: buffersrc.c:369
video.h
AVBufferSrcParameters::height
int height
Definition: buffersrc.h:87
ff_fmt_is_regular_yuv
int ff_fmt_is_regular_yuv(enum AVPixelFormat fmt)
Returns true if a pixel format is "regular YUV", which includes all pixel formats that are affected b...
Definition: avfiltergraph.c:651
AVCOL_SPC_BT2020_CL
@ AVCOL_SPC_BT2020_CL
ITU-R BT2020 constant luminance system.
Definition: pixfmt.h:652
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:64
AV_FRAME_FLAG_TOP_FIELD_FIRST
#define AV_FRAME_FLAG_TOP_FIELD_FIRST
A flag to mark frames where the top field is displayed first if the content is interlaced.
Definition: frame.h:653
formats.h
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: buffersrc.c:435
ff_fmt_is_forced_full_range
int ff_fmt_is_forced_full_range(enum AVPixelFormat fmt)
Returns true if a YUV pixel format is forced full range (i.e.
Definition: avfiltergraph.c:664
AVCOL_SPC_BT470BG
@ AVCOL_SPC_BT470BG
also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
Definition: pixfmt.h:646
AV_BUFFERSRC_FLAG_KEEP_REF
@ AV_BUFFERSRC_FLAG_KEEP_REF
Keep a reference to the frame.
Definition: buffersrc.h:53
av_color_space_name
const char * av_color_space_name(enum AVColorSpace space)
Definition: pixdesc.c:3546
AVFilterContext::priv
void * priv
private data for use by the filter
Definition: avfilter.h:472
AVBufferSrcParameters::sample_aspect_ratio
AVRational sample_aspect_ratio
Video only, the sample (pixel) aspect ratio.
Definition: buffersrc.h:92
AV_PIX_FMT_FLAG_HWACCEL
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:128
BufferSourceContext::frame_rate
AVRational frame_rate
frame_rate to set in the output link
Definition: buffersrc.c:47
samplefmt.h
AVCOL_RANGE_NB
@ AVCOL_RANGE_NB
Not part of ABI.
Definition: pixfmt.h:718
ff_vsrc_buffer
const AVFilter ff_vsrc_buffer
Definition: buffersrc.c:562
AVFrame::ch_layout
AVChannelLayout ch_layout
Channel layout of the audio data.
Definition: frame.h:790
pts
static int64_t pts
Definition: transcode_aac.c:644
AVRational::num
int num
Numerator.
Definition: rational.h:59
AVFilterPad
A filter pad used for either input or output.
Definition: filters.h:38
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:150
BufferSourceContext::sample_rate
int sample_rate
Definition: buffersrc.c:60
AVBufferSrcParameters::ch_layout
AVChannelLayout ch_layout
Audio only, the audio channel layout.
Definition: buffersrc.h:116
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:209
BufferSourceContext::prev_w
int prev_w
Definition: buffersrc.c:51
av_cold
#define av_cold
Definition: attributes.h:90
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:640
ff_set_common_color_spaces2
int ff_set_common_color_spaces2(const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out, AVFilterFormats *color_spaces)
Definition: formats.c:959
av_channel_layout_describe
int av_channel_layout_describe(const AVChannelLayout *channel_layout, char *buf, size_t buf_size)
Get a human-readable string describing the channel layout properties.
Definition: channel_layout.c:651
ff_outlink_set_status
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
Definition: filters.h:424
s
#define s(width, name)
Definition: cbs_vp9.c:198
BufferSourceContext::h
int h
Definition: buffersrc.c:51
AVCOL_SPC_SMPTE170M
@ AVCOL_SPC_SMPTE170M
also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
Definition: pixfmt.h:647
pix_fmt
static enum AVPixelFormat pix_fmt
Definition: demux_decode.c:41
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AV_CHANNEL_ORDER_UNSPEC
@ AV_CHANNEL_ORDER_UNSPEC
Only the channel count is specified, without any further information about the channel order.
Definition: channel_layout.h:119
av_q2d
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
push_frame
static int push_frame(AVFilterGraph *graph)
Definition: buffersrc.c:178
BufferSourceContext
Definition: buffersrc.c:44
avfilter_vsrc_buffer_outputs
static const AVFilterPad avfilter_vsrc_buffer_outputs[]
Definition: buffersrc.c:554
BufferSourceContext::ch_layout
AVChannelLayout ch_layout
Definition: buffersrc.c:64
filters.h
ctx
AVFormatContext * ctx
Definition: movenc.c:49
channels
channels
Definition: aptx.h:31
av_frame_clone
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:609
ff_set_common_samplerates2
int ff_set_common_samplerates2(const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out, AVFilterFormats *samplerates)
Definition: formats.c:935
av_get_sample_fmt_name
const char * av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
Return the name of sample_fmt, or NULL if sample_fmt is not recognized.
Definition: samplefmt.c:51
color_range
color_range
Definition: vf_selectivecolor.c:43
buffer_options
static const AVOption buffer_options[]
Definition: buffersrc.c:328
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: filters.h:263
AVCOL_SPC_IPT_C2
@ AVCOL_SPC_IPT_C2
SMPTE ST 2128, IPT-C2.
Definition: pixfmt.h:657
link
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 link
Definition: filter_design.txt:23
AVCOL_SPC_CHROMA_DERIVED_CL
@ AVCOL_SPC_CHROMA_DERIVED_CL
Chromaticity-derived constant luminance system.
Definition: pixfmt.h:655
BufferSourceContext::eof
int eof
Definition: buffersrc.c:66
av_color_range_name
const char * av_color_range_name(enum AVColorRange range)
Definition: pixdesc.c:3486
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:75
NULL
#define NULL
Definition: coverity.c:32
av_buffer_unref
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it.
Definition: buffer.c:139
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
BufferSourceContext::last_pts
int64_t last_pts
Definition: buffersrc.c:67
AV_OPT_TYPE_IMAGE_SIZE
@ AV_OPT_TYPE_IMAGE_SIZE
Underlying C type is two consecutive integers.
Definition: opt.h:303
ff_add_format
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:504
BufferSourceContext::nb_failed_requests
unsigned nb_failed_requests
Definition: buffersrc.c:48
AVCOL_SPC_YCGCO
@ AVCOL_SPC_YCGCO
used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
Definition: pixfmt.h:649
avfilter_internal.h
AVFilterGraph
Definition: avfilter.h:781
inputs
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 inputs
Definition: filter_design.txt:243
ff_add_channel_layout
int ff_add_channel_layout(AVFilterChannelLayouts **l, const AVChannelLayout *channel_layout)
Definition: formats.c:521
AVPixFmtDescriptor::flags
uint64_t flags
Combination of AV_PIX_FMT_FLAG_...
Definition: pixdesc.h:94
AVCOL_RANGE_UNSPECIFIED
@ AVCOL_RANGE_UNSPECIFIED
Definition: pixfmt.h:683
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
BufferSourceContext::pixel_aspect
AVRational pixel_aspect
Definition: buffersrc.c:55
AVFilterFormatsConfig
Lists of formats / etc.
Definition: avfilter.h:111
ff_filter_link
static FilterLink * ff_filter_link(AVFilterLink *link)
Definition: filters.h:197
AVBufferSrcParameters::frame_rate
AVRational frame_rate
Video only, the frame rate of the input video.
Definition: buffersrc.h:100
attribute_align_arg
#define attribute_align_arg
Definition: internal.h:50
av_buffersrc_close
int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags)
Close the buffer source after EOF.
Definition: buffersrc.c:277
V
#define V
Definition: buffersrc.c:326
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:368
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:94
copy
static void copy(const float *p1, float *p2, const int length)
Definition: vf_vaguedenoiser.c:186
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:317
av_buffersrc_parameters_alloc
AVBufferSrcParameters * av_buffersrc_parameters_alloc(void)
Allocate a new AVBufferSrcParameters instance.
Definition: buffersrc.c:104
AVCOL_SPC_YCGCO_RO
@ AVCOL_SPC_YCGCO_RO
YCgCo-R, odd addition of bits.
Definition: pixfmt.h:659
BufferSourceContext::hw_frames_ctx
AVBufferRef * hw_frames_ctx
Definition: buffersrc.c:57
config_props
static int config_props(AVFilterLink *link)
Definition: buffersrc.c:503
AVBufferSrcParameters::hw_frames_ctx
AVBufferRef * hw_frames_ctx
Video with a hwaccel pixel format only.
Definition: buffersrc.h:106
AVBufferSrcParameters::sample_rate
int sample_rate
Audio only, the audio sampling rate in samples per second.
Definition: buffersrc.h:111
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:56
AVFrame::time_base
AVRational time_base
Time base for the timestamps in this frame.
Definition: frame.h:516
frame.h
AVBufferSrcParameters::time_base
AVRational time_base
The timebase to be used for the timestamps on the input frames.
Definition: buffersrc.h:82
BufferSourceContext::link_delta
int link_delta
Definition: buffersrc.c:68
init_audio
static av_cold int init_audio(AVFilterContext *ctx)
Definition: buffersrc.c:380
BufferSourceContext::prev_color_space
enum AVColorSpace color_space prev_color_space
Definition: buffersrc.c:53
AVCOL_SPC_CHROMA_DERIVED_NCL
@ AVCOL_SPC_CHROMA_DERIVED_NCL
Chromaticity-derived non-constant luminance system.
Definition: pixfmt.h:654
AVCOL_SPC_SMPTE240M
@ AVCOL_SPC_SMPTE240M
derived from 170M primaries and D65 white point, 170M is derived from BT470 System M's primaries
Definition: pixfmt.h:648
av_channel_layout_from_string
int av_channel_layout_from_string(AVChannelLayout *channel_layout, const char *str)
Initialize a channel layout from a given string description.
Definition: channel_layout.c:310
av_buffersrc_parameters_set
int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param)
Initialize the buffersrc or abuffersrc filter with the provided parameters.
Definition: buffersrc.c:117
BufferSourceContext::w
int w
Definition: buffersrc.c:51
AVBufferSrcParameters::width
int width
Video only, the display dimensions of the input frames.
Definition: buffersrc.h:87
AVCOL_SPC_BT2020_NCL
@ AVCOL_SPC_BT2020_NCL
ITU-R BT2020 non-constant luminance system.
Definition: pixfmt.h:651
ff_avfilter_link_set_in_status
void ff_avfilter_link_set_in_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
Definition: avfilter.c:260
internal.h
av_buffersrc_add_frame_flags
int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
Add a frame to the buffer source.
Definition: buffersrc.c:192
AVColorSpace
AVColorSpace
YUV colorspace type.
Definition: pixfmt.h:640
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
FILTER_QUERY_FUNC2
#define FILTER_QUERY_FUNC2(func)
Definition: filters.h:239
init_video
static av_cold int init_video(AVFilterContext *ctx)
Definition: buffersrc.c:286
av_frame_move_ref
void av_frame_move_ref(AVFrame *dst, AVFrame *src)
Move everything contained in src to dst and reset src.
Definition: frame.c:649
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:256
AV_BUFFERSRC_FLAG_PUSH
@ AV_BUFFERSRC_FLAG_PUSH
Immediately push the frame to the output.
Definition: buffersrc.h:46
AVFilterPad::name
const char * name
Pad name.
Definition: filters.h:44
AVCOL_SPC_UNSPECIFIED
@ AVCOL_SPC_UNSPECIFIED
Definition: pixfmt.h:643
activate
static int activate(AVFilterContext *ctx)
Definition: buffersrc.c:536
AV_FRAME_FLAG_INTERLACED
#define AV_FRAME_FLAG_INTERLACED
A flag to mark frames whose content is interlaced.
Definition: frame.h:648
AVCOL_RANGE_MPEG
@ AVCOL_RANGE_MPEG
Narrow or limited range content.
Definition: pixfmt.h:700
AVFilter
Filter definition.
Definition: avfilter.h:201
AVHWFramesContext
This struct describes a set or pool of "hardware" frames (i.e.
Definition: hwcontext.h:115
ret
ret
Definition: filter_design.txt:187
frame
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
Definition: filter_design.txt:264
FF_COUNT2LAYOUT
#define FF_COUNT2LAYOUT(c)
Encode a channel count as a channel layout.
Definition: formats.h:102
AVFrame::sample_aspect_ratio
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
Definition: frame.h:496
CHECK_VIDEO_PARAM_CHANGE
#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, csp, range, pts)
Definition: buffersrc.c:71
AVBufferSrcParameters::color_range
enum AVColorRange color_range
Definition: buffersrc.h:122
channel_layout.h
AVBufferSrcParameters
This structure contains the parameters describing the frames that will be passed to this filter.
Definition: buffersrc.h:73
AVBufferSrcParameters::format
int format
video: the pixel format, value corresponds to enum AVPixelFormat audio: the sample format,...
Definition: buffersrc.h:78
buffer
the frame and frame reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFrame structures Several references can point to the same frame buffer
Definition: filter_design.txt:49
AVRational::den
int den
Denominator.
Definition: rational.h:60
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:72
AVCOL_SPC_FCC
@ AVCOL_SPC_FCC
FCC Title 47 Code of Federal Regulations 73.682 (a)(20)
Definition: pixfmt.h:645
BufferSourceContext::prev_pix_fmt
enum AVPixelFormat pix_fmt prev_pix_fmt
Definition: buffersrc.c:52
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Underlying C type is int.
Definition: opt.h:259
avfilter.h
av_channel_layout_uninit
void av_channel_layout_uninit(AVChannelLayout *channel_layout)
Free any allocated data in the channel layout and reset the channel count to 0.
Definition: channel_layout.c:440
AV_OPT_TYPE_PIXEL_FMT
@ AV_OPT_TYPE_PIXEL_FMT
Underlying C type is enum AVPixelFormat.
Definition: opt.h:307
ff_outlink_get_status
int ff_outlink_get_status(AVFilterLink *link)
Get the status on an output link.
Definition: avfilter.c:1618
AVFilterContext
An instance of a filter.
Definition: avfilter.h:457
av_channel_layout_copy
int av_channel_layout_copy(AVChannelLayout *dst, const AVChannelLayout *src)
Make a copy of a channel layout.
Definition: channel_layout.c:447
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:72
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
av_buffersrc_get_nb_failed_requests
unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
Get the number of failed requests.
Definition: buffersrc.c:319
mem.h
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
BufferSourceContext::prev_h
int prev_h
Definition: buffersrc.c:51
BufferSourceContext::channel_layout_str
char * channel_layout_str
Definition: buffersrc.c:63
channel_layouts
static const uint16_t channel_layouts[7]
Definition: dca_lbr.c:112
AVCOL_SPC_SMPTE2085
@ AVCOL_SPC_SMPTE2085
SMPTE 2085, Y'D'zD'x.
Definition: pixfmt.h:653
BufferSourceContext::prev_color_range
enum AVColorRange color_range prev_color_range
Definition: buffersrc.c:54
BufferSourceContext::time_base
AVRational time_base
time_base to set in the output link
Definition: buffersrc.c:46
av_buffersrc_write_frame
int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
Add a frame to the buffer source.
Definition: buffersrc.c:167
timestamp.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:482
hwcontext.h
AVERROR_BUG
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:52
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
ff_asrc_abuffer
const AVFilter ff_asrc_abuffer
Definition: buffersrc.c:584
AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT
@ AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT
Do not check for format changes.
Definition: buffersrc.h:41
h
h
Definition: vp9dsp_template.c:2070
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Underlying C type is a uint8_t* that is either NULL or points to a C string allocated with the av_mal...
Definition: opt.h:276
AVCOL_SPC_BT709
@ AVCOL_SPC_BT709
also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / derived in SMPTE RP 177 Annex B
Definition: pixfmt.h:642
AVColorRange
AVColorRange
Visual content value range.
Definition: pixfmt.h:682
AVCOL_SPC_ICTCP
@ AVCOL_SPC_ICTCP
ITU-R BT.2100-0, ICtCp.
Definition: pixfmt.h:656
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Special option type for declaring named constants.
Definition: opt.h:299
buffersrc.h
BufferSourceContext::sample_fmt
enum AVSampleFormat sample_fmt
Definition: buffersrc.c:61
av_get_pix_fmt_name
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:3090
avfilter_asrc_abuffer_outputs
static const AVFilterPad avfilter_asrc_abuffer_outputs[]
Definition: buffersrc.c:576
BufferSourceContext::prev_delta
int prev_delta
Definition: buffersrc.c:68
Generated on Sun Dec 8 2024 19:22:50 for FFmpeg by   doxygen 1.8.17