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 "buffersrc.h"
39 #include "filters.h"
40 #include "formats.h"
41 #include "internal.h"
42 
43 typedef struct BufferSourceContext {
44  const AVClass *class;
45  AVRational time_base; ///< time_base to set in the output link
46  AVRational frame_rate; ///< frame_rate to set in the output link
47  unsigned nb_failed_requests;
48 
49  /* video only */
50  int w, h, prev_w, prev_h;
51  enum AVPixelFormat pix_fmt, prev_pix_fmt;
52  enum AVColorSpace color_space, prev_color_space;
53  enum AVColorRange color_range, prev_color_range;
54  AVRational pixel_aspect;
55 
56  AVBufferRef *hw_frames_ctx;
57 
58  /* audio only */
59  int sample_rate;
60  enum AVSampleFormat sample_fmt;
61  int channels;
62  char *channel_layout_str;
63  AVChannelLayout ch_layout;
64 
65  int eof;
66  int64_t last_pts;
67  int link_delta, prev_delta;
68 } BufferSourceContext;
69 
70 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, csp, range, pts)\
71  c->link_delta = c->w != width || c->h != height || c->pix_fmt != format ||\
72  c->color_space != csp || c->color_range != range;\
73  c->prev_delta = c->prev_w != width || c->prev_h != height || c->prev_pix_fmt != format ||\
74  c->prev_color_space != csp || c->prev_color_range != range;\
75  if (c->link_delta) {\
76  int loglevel = c->prev_delta ? AV_LOG_WARNING : AV_LOG_DEBUG;\
77  av_log(s, loglevel, "Changing video frame properties on the fly is not supported by all filters.\n");\
78  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",\
79  c->w, c->h, c->pix_fmt, av_color_space_name(c->color_space), av_color_range_name(c->color_range),\
80  width, height, format, av_color_space_name(csp), av_color_range_name(range),\
81  av_ts2timestr(pts, &s->outputs[0]->time_base));\
82  }\
83  if (c->prev_delta) {\
84  if (!c->link_delta)\
85  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));\
86  c->prev_w = width;\
87  c->prev_h = height;\
88  c->prev_pix_fmt = format;\
89  c->prev_color_space = csp;\
90  c->prev_color_range = range;\
91  }
92 
93 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, layout, format, pts)\
94  if (c->sample_fmt != format || c->sample_rate != srate ||\
95  av_channel_layout_compare(&c->ch_layout, &layout) || c->channels != layout.nb_channels) {\
96  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",\
97  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,\
98  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));\
99  av_log(s, AV_LOG_ERROR, "Changing audio frame properties on the fly is not supported.\n");\
100  return AVERROR(EINVAL);\
101  }
102 
103 AVBufferSrcParameters *av_buffersrc_parameters_alloc(void)
104 {
105  AVBufferSrcParameters *par = av_mallocz(sizeof(*par));
106  if (!par)
107  return NULL;
108 
109  par->format = -1;
110  par->color_range = AVCOL_RANGE_UNSPECIFIED;
111  par->color_space = AVCOL_SPC_UNSPECIFIED;
112 
113  return par;
114 }
115 
116 int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param)
117 {
118  BufferSourceContext *s = ctx->priv;
119 
120  if (param->time_base.num > 0 && param->time_base.den > 0)
121  s->time_base = param->time_base;
122 
123  switch (ctx->filter->outputs[0].type) {
124  case AVMEDIA_TYPE_VIDEO:
125  if (param->format != AV_PIX_FMT_NONE) {
126  s->pix_fmt = s->prev_pix_fmt = param->format;
127  }
128  if (param->width > 0)
129  s->w = s->prev_w = param->width;
130  if (param->height > 0)
131  s->h = s->prev_h = param->height;
132  if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)
133  s->pixel_aspect = param->sample_aspect_ratio;
134  if (param->frame_rate.num > 0 && param->frame_rate.den > 0)
135  s->frame_rate = param->frame_rate;
136  if (param->hw_frames_ctx) {
137  av_buffer_unref(&s->hw_frames_ctx);
138  s->hw_frames_ctx = av_buffer_ref(param->hw_frames_ctx);
139  if (!s->hw_frames_ctx)
140  return AVERROR(ENOMEM);
141  }
142  if (param->color_space != AVCOL_SPC_UNSPECIFIED)
143  s->color_space = s->prev_color_space = param->color_space;
144  if (param->color_range != AVCOL_RANGE_UNSPECIFIED)
145  s->color_range = s->prev_color_range = param->color_range;
146  break;
147  case AVMEDIA_TYPE_AUDIO:
148  if (param->format != AV_SAMPLE_FMT_NONE) {
149  s->sample_fmt = param->format;
150  }
151  if (param->sample_rate > 0)
152  s->sample_rate = param->sample_rate;
153  if (param->ch_layout.nb_channels) {
154  int ret = av_channel_layout_copy(&s->ch_layout, &param->ch_layout);
155  if (ret < 0)
156  return ret;
157  }
158  break;
159  default:
160  return AVERROR_BUG;
161  }
162 
163  return 0;
164 }
165 
166 int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
167 {
168  return av_buffersrc_add_frame_flags(ctx, (AVFrame *)frame,
169  AV_BUFFERSRC_FLAG_KEEP_REF);
170 }
171 
172 int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
173 {
174  return av_buffersrc_add_frame_flags(ctx, frame, 0);
175 }
176 
177 static int push_frame(AVFilterGraph *graph)
178 {
179  int ret;
180 
181  while (1) {
182  ret = ff_filter_graph_run_once(graph);
183  if (ret == AVERROR(EAGAIN))
184  break;
185  if (ret < 0)
186  return ret;
187  }
188  return 0;
189 }
190 
191 int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
192 {
193  BufferSourceContext *s = ctx->priv;
194  AVFrame *copy;
195  int refcounted, ret;
196 
197  s->nb_failed_requests = 0;
198 
199  if (!frame)
200  return av_buffersrc_close(ctx, s->last_pts, flags);
201  if (s->eof)
202  return AVERROR_EOF;
203 
204  s->last_pts = frame->pts + frame->duration;
205 
206  refcounted = !!frame->buf[0];
207 
208  if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
209 
210  switch (ctx->outputs[0]->type) {
211  case AVMEDIA_TYPE_VIDEO:
212  CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
213  frame->format, frame->colorspace,
214  frame->color_range, frame->pts);
215  break;
216  case AVMEDIA_TYPE_AUDIO:
217  /* For layouts unknown on input but known on link after negotiation. */
218  if (frame->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC && frame->ch_layout.nb_channels == s->ch_layout.nb_channels) {
219  ret = av_channel_layout_copy(&frame->ch_layout, &s->ch_layout);
220  if (ret < 0)
221  return ret;
222  }
223  CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->ch_layout,
224  frame->format, frame->pts);
225  break;
226  default:
227  return AVERROR(EINVAL);
228  }
229 
230  }
231 
232  if (refcounted && !(flags & AV_BUFFERSRC_FLAG_KEEP_REF)) {
233  if (!(copy = av_frame_alloc()))
234  return AVERROR(ENOMEM);
235  av_frame_move_ref(copy, frame);
236  } else {
237  copy = av_frame_clone(frame);
238  if (!copy)
239  return AVERROR(ENOMEM);
240  }
241 
242 #if FF_API_INTERLACED_FRAME
243 FF_DISABLE_DEPRECATION_WARNINGS
244  if (copy->interlaced_frame)
245  copy->flags |= AV_FRAME_FLAG_INTERLACED;
246  if (copy->top_field_first)
247  copy->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
248 FF_ENABLE_DEPRECATION_WARNINGS
249 #endif
250 
251 #if FF_API_FRAME_KEY
252 FF_DISABLE_DEPRECATION_WARNINGS
253  if (copy->key_frame)
254  copy->flags |= AV_FRAME_FLAG_KEY;
255 FF_ENABLE_DEPRECATION_WARNINGS
256 #endif
257 
258  if (copy->colorspace == AVCOL_SPC_UNSPECIFIED)
259  copy->colorspace = ctx->outputs[0]->colorspace;
260  if (copy->color_range == AVCOL_RANGE_UNSPECIFIED)
261  copy->color_range = ctx->outputs[0]->color_range;
262 
263  ret = ff_filter_frame(ctx->outputs[0], copy);
264  if (ret < 0)
265  return ret;
266 
267  if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {
268  ret = push_frame(ctx->graph);
269  if (ret < 0)
270  return ret;
271  }
272 
273  return 0;
274 }
275 
276 int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags)
277 {
278  BufferSourceContext *s = ctx->priv;
279 
280  s->eof = 1;
281  ff_avfilter_link_set_in_status(ctx->outputs[0], AVERROR_EOF, pts);
282  return (flags & AV_BUFFERSRC_FLAG_PUSH) ? push_frame(ctx->graph) : 0;
283 }
284 
285 static av_cold int init_video(AVFilterContext *ctx)
286 {
287  BufferSourceContext *c = ctx->priv;
288 
289  if (c->pix_fmt == AV_PIX_FMT_NONE) {
290  av_log(ctx, AV_LOG_ERROR, "Unspecified pixel format\n");
291  return AVERROR(EINVAL);
292  }
293  if (c->w <= 0 || c->h <= 0) {
294  av_log(ctx, AV_LOG_ERROR, "Invalid size %dx%d\n", c->w, c->h);
295  return AVERROR(EINVAL);
296  }
297  if (av_q2d(c->time_base) <= 0) {
298  av_log(ctx, AV_LOG_ERROR, "Invalid time base %d/%d\n", c->time_base.num, c->time_base.den);
299  return AVERROR(EINVAL);
300  }
301 
302  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",
303  c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
304  c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
305  c->pixel_aspect.num, c->pixel_aspect.den,
306  av_color_space_name(c->color_space), av_color_range_name(c->color_range));
307 
308  return 0;
309 }
310 
311 unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
312 {
313  return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
314 }
315 
316 #define OFFSET(x) offsetof(BufferSourceContext, x)
317 #define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
318 #define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
319 
320 static const AVOption buffer_options[] = {
321  { "width", NULL, OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
322  { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = V },
323  { "height", NULL, OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
324  { "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 },
325  { "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
326  { "pixel_aspect", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
327  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
328  { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
329  { "colorspace", "select colorspace", OFFSET(color_space), AV_OPT_TYPE_INT, {.i64=AVCOL_SPC_UNSPECIFIED}, 0, AVCOL_SPC_NB-1, V, .unit = "colorspace"},
330  { "gbr", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_RGB}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
331  { "bt709", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT709}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
332  { "unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_UNSPECIFIED}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
333  { "fcc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_FCC}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
334  { "bt470bg", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT470BG}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
335  { "smpte170m", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_SMPTE170M}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
336  { "smpte240m", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_SMPTE240M}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
337  { "ycgco", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_YCGCO}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
338  { "ycgco-re", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_YCGCO_RE}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
339  { "ycgco-ro", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_YCGCO_RO}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
340  { "bt2020nc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT2020_NCL}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
341  { "bt2020c", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT2020_CL}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
342  { "smpte2085", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_SMPTE2085}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
343  { "chroma-derived-nc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_CHROMA_DERIVED_NCL},INT_MIN, INT_MAX, V, .unit = "colorspace"},
344  { "chroma-derived-c", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_CHROMA_DERIVED_CL}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
345  { "ictcp", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_ICTCP}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
346  { "ipt-c2", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_IPT_C2}, INT_MIN, INT_MAX, V, .unit = "colorspace"},
347  { "range", "select color range", OFFSET(color_range), AV_OPT_TYPE_INT, {.i64=AVCOL_RANGE_UNSPECIFIED}, 0, AVCOL_RANGE_NB-1, V, .unit = "range"},
348  { "unspecified", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_UNSPECIFIED}, 0, 0, V, .unit = "range"},
349  { "unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_UNSPECIFIED}, 0, 0, V, .unit = "range"},
350  { "limited", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG}, 0, 0, V, .unit = "range"},
351  { "tv", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG}, 0, 0, V, .unit = "range"},
352  { "mpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG}, 0, 0, V, .unit = "range"},
353  { "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG}, 0, 0, V, .unit = "range"},
354  { "pc", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG}, 0, 0, V, .unit = "range"},
355  { "jpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG}, 0, 0, V, .unit = "range"},
356  { NULL },
357 };
358 
359 AVFILTER_DEFINE_CLASS(buffer);
360 
361 static const AVOption abuffer_options[] = {
362  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
363  { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
364  { "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 },
365  { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
366  { "channels", NULL, OFFSET(channels), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
367  { NULL },
368 };
369 
370 AVFILTER_DEFINE_CLASS(abuffer);
371 
372 static av_cold int init_audio(AVFilterContext *ctx)
373 {
374  BufferSourceContext *s = ctx->priv;
375  char buf[128];
376  int ret = 0;
377 
378  if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
379  av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");
380  return AVERROR(EINVAL);
381  }
382 
383  if (s->channel_layout_str || s->ch_layout.nb_channels) {
384  int n;
385 
386  if (!s->ch_layout.nb_channels) {
387  ret = av_channel_layout_from_string(&s->ch_layout, s->channel_layout_str);
388  if (ret < 0) {
389  av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
390  s->channel_layout_str);
391  return AVERROR(EINVAL);
392  }
393  }
394 
395  n = s->ch_layout.nb_channels;
396  av_channel_layout_describe(&s->ch_layout, buf, sizeof(buf));
397  if (s->channels) {
398  if (n != s->channels) {
399  av_log(ctx, AV_LOG_ERROR,
400  "Mismatching channel count %d and layout '%s' "
401  "(%d channels)\n",
402  s->channels, buf, n);
403  return AVERROR(EINVAL);
404  }
405  }
406  s->channels = n;
407  } else if (!s->channels) {
408  av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
409  "channel layout specified\n");
410  return AVERROR(EINVAL);
411  } else {
412  s->ch_layout = FF_COUNT2LAYOUT(s->channels);
413  av_channel_layout_describe(&s->ch_layout, buf, sizeof(buf));
414  }
415 
416  if (!s->time_base.num)
417  s->time_base = (AVRational){1, s->sample_rate};
418 
419  av_log(ctx, AV_LOG_VERBOSE,
420  "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
421  s->time_base.num, s->time_base.den, av_get_sample_fmt_name(s->sample_fmt),
422  s->sample_rate, buf);
423 
424  return ret;
425 }
426 
427 static av_cold void uninit(AVFilterContext *ctx)
428 {
429  BufferSourceContext *s = ctx->priv;
430  av_buffer_unref(&s->hw_frames_ctx);
431  av_channel_layout_uninit(&s->ch_layout);
432 }
433 
434 static int query_formats(AVFilterContext *ctx)
435 {
436  BufferSourceContext *c = ctx->priv;
437  AVFilterChannelLayouts *channel_layouts = NULL;
438  AVFilterFormats *formats = NULL;
439  AVFilterFormats *samplerates = NULL;
440  AVFilterFormats *color_spaces = NULL;
441  AVFilterFormats *color_ranges = NULL;
442  int ret;
443 
444  switch (ctx->outputs[0]->type) {
445  case AVMEDIA_TYPE_VIDEO: {
446  enum AVPixelFormat swfmt = c->pix_fmt;
447  if (av_pix_fmt_desc_get(swfmt)->flags & AV_PIX_FMT_FLAG_HWACCEL) {
448  if (!c->hw_frames_ctx) {
449  av_log(ctx, AV_LOG_ERROR, "Setting BufferSourceContext.pix_fmt "
450  "to a HW format requires hw_frames_ctx to be non-NULL!\n");
451  return AVERROR(EINVAL);
452  }
453  swfmt = ((AVHWFramesContext *) c->hw_frames_ctx->data)->sw_format;
454  }
455  if ((ret = ff_add_format (&formats, c->pix_fmt)) < 0 ||
456  (ret = ff_set_common_formats (ctx , formats )) < 0)
457  return ret;
458  /* force specific colorspace/range downstream only for ordinary YUV */
459  if (ff_fmt_is_regular_yuv(swfmt)) {
460  if ((ret = ff_add_format(&color_spaces, c->color_space)) < 0 ||
461  (ret = ff_set_common_color_spaces(ctx, color_spaces)) < 0)
462  return ret;
463  if ((ret = ff_add_format(&color_ranges, c->color_range)) < 0)
464  return ret;
465  if (c->color_range == AVCOL_RANGE_UNSPECIFIED) {
466  /* allow implicitly promoting unspecified to mpeg */
467  if ((ret = ff_add_format(&color_ranges, AVCOL_RANGE_MPEG)) < 0)
468  return ret;
469  }
470  if ((ret = ff_set_common_color_ranges(ctx, color_ranges)) < 0)
471  return ret;
472  }
473  break;
474  }
475  case AVMEDIA_TYPE_AUDIO:
476  if ((ret = ff_add_format (&formats , c->sample_fmt )) < 0 ||
477  (ret = ff_set_common_formats (ctx , formats )) < 0 ||
478  (ret = ff_add_format (&samplerates, c->sample_rate)) < 0 ||
479  (ret = ff_set_common_samplerates (ctx , samplerates )) < 0)
480  return ret;
481 
482  if ((ret = ff_add_channel_layout(&channel_layouts, &c->ch_layout)) < 0)
483  return ret;
484  if ((ret = ff_set_common_channel_layouts(ctx, channel_layouts)) < 0)
485  return ret;
486  break;
487  default:
488  return AVERROR(EINVAL);
489  }
490 
491  return 0;
492 }
493 
494 static int config_props(AVFilterLink *link)
495 {
496  BufferSourceContext *c = link->src->priv;
497 
498  switch (link->type) {
499  case AVMEDIA_TYPE_VIDEO:
500  link->w = c->w;
501  link->h = c->h;
502  link->sample_aspect_ratio = c->pixel_aspect;
503 
504  if (c->hw_frames_ctx) {
505  link->hw_frames_ctx = av_buffer_ref(c->hw_frames_ctx);
506  if (!link->hw_frames_ctx)
507  return AVERROR(ENOMEM);
508  }
509  break;
510  case AVMEDIA_TYPE_AUDIO:
511  if (!c->ch_layout.nb_channels || c->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC) {
512  int ret = av_channel_layout_copy(&c->ch_layout, &link->ch_layout);
513  if (ret < 0)
514  return ret;
515  }
516  break;
517  default:
518  return AVERROR(EINVAL);
519  }
520 
521  link->time_base = c->time_base;
522  link->frame_rate = c->frame_rate;
523  return 0;
524 }
525 
526 static int activate(AVFilterContext *ctx)
527 {
528  AVFilterLink *outlink = ctx->outputs[0];
529  BufferSourceContext *c = ctx->priv;
530 
531  if (!c->eof && ff_outlink_get_status(outlink)) {
532  c->eof = 1;
533  return 0;
534  }
535 
536  if (c->eof) {
537  ff_outlink_set_status(outlink, AVERROR_EOF, c->last_pts);
538  return 0;
539  }
540  c->nb_failed_requests++;
541  return FFERROR_NOT_READY;
542 }
543 
544 static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {
545  {
546  .name = "default",
547  .type = AVMEDIA_TYPE_VIDEO,
548  .config_props = config_props,
549  },
550 };
551 
552 const AVFilter ff_vsrc_buffer = {
553  .name = "buffer",
554  .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
555  .priv_size = sizeof(BufferSourceContext),
556  .activate = activate,
557  .init = init_video,
558  .uninit = uninit,
559 
560  .inputs = NULL,
561  FILTER_OUTPUTS(avfilter_vsrc_buffer_outputs),
562  FILTER_QUERY_FUNC(query_formats),
563  .priv_class = &buffer_class,
564 };
565 
566 static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {
567  {
568  .name = "default",
569  .type = AVMEDIA_TYPE_AUDIO,
570  .config_props = config_props,
571  },
572 };
573 
574 const AVFilter ff_asrc_abuffer = {
575  .name = "abuffer",
576  .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
577  .priv_size = sizeof(BufferSourceContext),
578  .activate = activate,
579  .init = init_audio,
580  .uninit = uninit,
581 
582  .inputs = NULL,
583  FILTER_OUTPUTS(avfilter_asrc_abuffer_outputs),
584  FILTER_QUERY_FUNC(query_formats),
585  .priv_class = &abuffer_class,
586 };
formats
formats
Definition: signature.h:48
AVBufferSrcParameters::color_space
enum AVColorSpace color_space
Video only, the YUV colorspace and range.
Definition: buffersrc.h:121
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
Definition: opt.h:247
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(buffer)
AVCOL_SPC_YCGCO_RE
@ AVCOL_SPC_YCGCO_RE
YCgCo-R, even addition of bits.
Definition: pixfmt.h:627
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1015
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2965
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
FFERROR_NOT_READY
return FFERROR_NOT_READY
Definition: filter_design.txt:204
AV_BUFFERSRC_FLAG_PUSH
@ AV_BUFFERSRC_FLAG_PUSH
Immediately push the frame to the output.
Definition: buffersrc.h:46
A
#define A
Definition: buffersrc.c:317
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
pixdesc.h
w
uint8_t w
Definition: llviddspenc.c:38
AVCOL_RANGE_JPEG
@ AVCOL_RANGE_JPEG
Full range content.
Definition: pixfmt.h:686
AVOption
AVOption.
Definition: opt.h:346
AVCOL_SPC_NB
@ AVCOL_SPC_NB
Not part of ABI.
Definition: pixfmt.h:629
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:172
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:159
OFFSET
#define OFFSET(x)
Definition: buffersrc.c:316
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
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:610
float.h
CHECK_AUDIO_PARAM_CHANGE
#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, layout, format, pts)
Definition: buffersrc.c:93
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:1420
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:170
BufferSourceContext::channels
int channels
Definition: buffersrc.c:61
AV_OPT_TYPE_RATIONAL
@ AV_OPT_TYPE_RATIONAL
Definition: opt.h:240
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:313
abuffer_options
static const AVOption abuffer_options[]
Definition: buffersrc.c:361
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:605
AVCOL_SPC_BT2020_CL
@ AVCOL_SPC_BT2020_CL
ITU-R BT2020 constant luminance system.
Definition: pixfmt.h:621
sample_rate
sample_rate
Definition: ffmpeg_filter.c:424
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:638
formats.h
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: buffersrc.c:427
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:615
av_color_space_name
const char * av_color_space_name(enum AVColorSpace space)
Definition: pixdesc.c:3341
AVFilterContext::priv
void * priv
private data for use by the filter
Definition: avfilter.h:422
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:46
samplefmt.h
AVCOL_RANGE_NB
@ AVCOL_RANGE_NB
Not part of ABI.
Definition: pixfmt.h:687
ff_vsrc_buffer
const AVFilter ff_vsrc_buffer
Definition: buffersrc.c:552
AVFrame::ch_layout
AVChannelLayout ch_layout
Channel layout of the audio data.
Definition: frame.h:775
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: internal.h:33
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:148
BufferSourceContext::sample_rate
int sample_rate
Definition: buffersrc.c:59
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:180
BufferSourceContext::prev_w
int prev_w
Definition: buffersrc.c:50
av_cold
#define av_cold
Definition: attributes.h:90
ff_set_common_formats
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:868
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:625
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:645
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:189
s
#define s(width, name)
Definition: cbs_vp9.c:198
BufferSourceContext::h
int h
Definition: buffersrc.c:50
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:616
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:112
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:177
BufferSourceContext
Definition: buffersrc.c:43
avfilter_vsrc_buffer_outputs
static const AVFilterPad avfilter_vsrc_buffer_outputs[]
Definition: buffersrc.c:544
BufferSourceContext::ch_layout
AVChannelLayout ch_layout
Definition: buffersrc.c:63
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:593
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:320
AVCOL_SPC_IPT_C2
@ AVCOL_SPC_IPT_C2
SMPTE ST 2128, IPT-C2.
Definition: pixfmt.h:626
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:624
BufferSourceContext::eof
int eof
Definition: buffersrc.c:65
av_color_range_name
const char * av_color_range_name(enum AVColorRange range)
Definition: pixdesc.c:3281
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
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:66
AV_OPT_TYPE_IMAGE_SIZE
@ AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:245
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:505
BufferSourceContext::nb_failed_requests
unsigned nb_failed_requests
Definition: buffersrc.c:47
AVCOL_SPC_YCGCO
@ AVCOL_SPC_YCGCO
used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
Definition: pixfmt.h:618
AVFilterGraph
Definition: avfilter.h:813
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:522
AVCOL_RANGE_UNSPECIFIED
@ AVCOL_RANGE_UNSPECIFIED
Definition: pixfmt.h:652
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:54
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:276
V
#define V
Definition: buffersrc.c:318
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
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:303
av_buffersrc_parameters_alloc
AVBufferSrcParameters * av_buffersrc_parameters_alloc(void)
Allocate a new AVBufferSrcParameters instance.
Definition: buffersrc.c:103
AVCOL_SPC_YCGCO_RO
@ AVCOL_SPC_YCGCO_RO
YCgCo-R, odd addition of bits.
Definition: pixfmt.h:628
BufferSourceContext::hw_frames_ctx
AVBufferRef * hw_frames_ctx
Definition: buffersrc.c:56
config_props
static int config_props(AVFilterLink *link)
Definition: buffersrc.c:494
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:501
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:67
init_audio
static av_cold int init_audio(AVFilterContext *ctx)
Definition: buffersrc.c:372
BufferSourceContext::prev_color_space
enum AVColorSpace color_space prev_color_space
Definition: buffersrc.c:52
AVCOL_SPC_CHROMA_DERIVED_NCL
@ AVCOL_SPC_CHROMA_DERIVED_NCL
Chromaticity-derived non-constant luminance system.
Definition: pixfmt.h:623
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: buffersrc.c:434
internal.h
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:617
ff_set_common_color_ranges
int ff_set_common_color_ranges(AVFilterContext *ctx, AVFilterFormats *color_ranges)
Definition: formats.c:845
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:303
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:116
BufferSourceContext::w
int w
Definition: buffersrc.c:50
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:620
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:255
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:191
AVColorSpace
AVColorSpace
YUV colorspace type.
Definition: pixfmt.h:609
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
init_video
static av_cold int init_video(AVFilterContext *ctx)
Definition: buffersrc.c:285
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:633
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_NO_CHECK_FORMAT
@ AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT
Do not check for format changes.
Definition: buffersrc.h:41
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:39
AVCOL_SPC_UNSPECIFIED
@ AVCOL_SPC_UNSPECIFIED
Definition: pixfmt.h:612
activate
static int activate(AVFilterContext *ctx)
Definition: buffersrc.c:526
AV_FRAME_FLAG_INTERLACED
#define AV_FRAME_FLAG_INTERLACED
A flag to mark frames whose content is interlaced.
Definition: frame.h:633
AVCOL_RANGE_MPEG
@ AVCOL_RANGE_MPEG
Narrow or limited range content.
Definition: pixfmt.h:669
AV_BUFFERSRC_FLAG_KEEP_REF
@ AV_BUFFERSRC_FLAG_KEEP_REF
Keep a reference to the frame.
Definition: buffersrc.h:53
AVFilter
Filter definition.
Definition: avfilter.h:166
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_set_common_color_spaces
int ff_set_common_color_spaces(AVFilterContext *ctx, AVFilterFormats *color_spaces)
Definition: formats.c:827
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:481
CHECK_VIDEO_PARAM_CHANGE
#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, csp, range, pts)
Definition: buffersrc.c:70
AVFrame::hw_frames_ctx
AVBufferRef * hw_frames_ctx
For hwaccel-format frames, this should be a reference to the AVHWFramesContext describing the frame.
Definition: frame.h:725
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:614
BufferSourceContext::prev_pix_fmt
enum AVPixelFormat pix_fmt prev_pix_fmt
Definition: buffersrc.c:51
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:235
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:433
AV_OPT_TYPE_PIXEL_FMT
@ AV_OPT_TYPE_PIXEL_FMT
Definition: opt.h:246
ff_outlink_get_status
int ff_outlink_get_status(AVFilterLink *link)
Get the status on an output link.
Definition: avfilter.c:1593
AVFilterContext
An instance of a filter.
Definition: avfilter.h:407
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:440
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:311
mem.h
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
BufferSourceContext::prev_h
int prev_h
Definition: buffersrc.c:50
BufferSourceContext::channel_layout_str
char * channel_layout_str
Definition: buffersrc.c:62
channel_layouts
static const uint16_t channel_layouts[7]
Definition: dca_lbr.c:112
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:183
AVCOL_SPC_SMPTE2085
@ AVCOL_SPC_SMPTE2085
SMPTE 2085, Y'D'zD'x.
Definition: pixfmt.h:622
BufferSourceContext::prev_color_range
enum AVColorRange color_range prev_color_range
Definition: buffersrc.c:53
BufferSourceContext::time_base
AVRational time_base
time_base to set in the output link
Definition: buffersrc.c:45
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:166
timestamp.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
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:574
ff_set_common_samplerates
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:809
h
h
Definition: vp9dsp_template.c:2038
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:239
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:611
AVColorRange
AVColorRange
Visual content value range.
Definition: pixfmt.h:651
AVCOL_SPC_ICTCP
@ AVCOL_SPC_ICTCP
ITU-R BT.2100-0, ICtCp.
Definition: pixfmt.h:625
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:244
buffersrc.h
BufferSourceContext::sample_fmt
enum AVSampleFormat sample_fmt
Definition: buffersrc.c:60
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:2885
avfilter_asrc_abuffer_outputs
static const AVFilterPad avfilter_asrc_abuffer_outputs[]
Definition: buffersrc.c:566
ff_set_common_channel_layouts
int ff_set_common_channel_layouts(AVFilterContext *ctx, AVFilterChannelLayouts *channel_layouts)
Helpers for query_formats() which set all free audio links to the same list of channel layouts/sample...
Definition: formats.c:791
BufferSourceContext::prev_delta
int prev_delta
Definition: buffersrc.c:67
Generated on Thu Apr 18 2024 19:22:07 for FFmpeg by   doxygen 1.8.17