FFmpeg
buffersrc.c
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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 
29 #include "libavutil/common.h"
30 #include "libavutil/frame.h"
31 #include "libavutil/imgutils.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/samplefmt.h"
35 #include "libavutil/timestamp.h"
36 #include "audio.h"
37 #include "avfilter.h"
38 #include "buffersrc.h"
39 #include "filters.h"
40 #include "formats.h"
41 #include "internal.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
49 
50  /* video only */
51  int w, h;
54 
56 
57  /* audio only */
60  int channels;
63 
64  int eof;
65  int64_t last_pts;
67 
68 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, pts)\
69  if (c->w != width || c->h != height || c->pix_fmt != format) {\
70  av_log(s, AV_LOG_INFO, "filter context - w: %d h: %d fmt: %d, incoming frame - w: %d h: %d fmt: %d pts_time: %s\n",\
71  c->w, c->h, c->pix_fmt, width, height, format, av_ts2timestr(pts, &s->outputs[0]->time_base));\
72  av_log(s, AV_LOG_WARNING, "Changing video frame properties on the fly is not supported by all filters.\n");\
73  }
74 
75 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, layout, format, pts)\
76  if (c->sample_fmt != format || c->sample_rate != srate ||\
77  av_channel_layout_compare(&c->ch_layout, &layout) || c->channels != layout.nb_channels) {\
78  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",\
79  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,\
80  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));\
81  av_log(s, AV_LOG_ERROR, "Changing audio frame properties on the fly is not supported.\n");\
82  return AVERROR(EINVAL);\
83  }
84 
86 {
87  AVBufferSrcParameters *par = av_mallocz(sizeof(*par));
88  if (!par)
89  return NULL;
90 
91  par->format = -1;
92 
93  return par;
94 }
95 
97 {
98  BufferSourceContext *s = ctx->priv;
99 
100  if (param->time_base.num > 0 && param->time_base.den > 0)
101  s->time_base = param->time_base;
102 
103  switch (ctx->filter->outputs[0].type) {
104  case AVMEDIA_TYPE_VIDEO:
105  if (param->format != AV_PIX_FMT_NONE) {
106  s->pix_fmt = param->format;
107  }
108  if (param->width > 0)
109  s->w = param->width;
110  if (param->height > 0)
111  s->h = param->height;
112  if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)
113  s->pixel_aspect = param->sample_aspect_ratio;
114  if (param->frame_rate.num > 0 && param->frame_rate.den > 0)
115  s->frame_rate = param->frame_rate;
116  if (param->hw_frames_ctx) {
117  av_buffer_unref(&s->hw_frames_ctx);
118  s->hw_frames_ctx = av_buffer_ref(param->hw_frames_ctx);
119  if (!s->hw_frames_ctx)
120  return AVERROR(ENOMEM);
121  }
122  break;
123  case AVMEDIA_TYPE_AUDIO:
124  if (param->format != AV_SAMPLE_FMT_NONE) {
125  s->sample_fmt = param->format;
126  }
127  if (param->sample_rate > 0)
128  s->sample_rate = param->sample_rate;
129 #if FF_API_OLD_CHANNEL_LAYOUT
131  // if the old/new fields are set inconsistently, prefer the old ones
132  if (param->channel_layout && (param->ch_layout.order != AV_CHANNEL_ORDER_NATIVE ||
133  param->ch_layout.u.mask != param->channel_layout)) {
134  av_channel_layout_uninit(&s->ch_layout);
135  av_channel_layout_from_mask(&s->ch_layout, param->channel_layout);
137  } else
138 #endif
139  if (param->ch_layout.nb_channels) {
140  int ret = av_channel_layout_copy(&s->ch_layout, &param->ch_layout);
141  if (ret < 0)
142  return ret;
143  }
144  break;
145  default:
146  return AVERROR_BUG;
147  }
148 
149  return 0;
150 }
151 
153 {
156 }
157 
159 {
161 }
162 
163 static int push_frame(AVFilterGraph *graph)
164 {
165  int ret;
166 
167  while (1) {
168  ret = ff_filter_graph_run_once(graph);
169  if (ret == AVERROR(EAGAIN))
170  break;
171  if (ret < 0)
172  return ret;
173  }
174  return 0;
175 }
176 
178 {
179  BufferSourceContext *s = ctx->priv;
180  AVFrame *copy;
181  int refcounted, ret;
182 
183 #if FF_API_OLD_CHANNEL_LAYOUT
185  if (frame && frame->channel_layout &&
187  av_log(ctx, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");
188  return AVERROR(EINVAL);
189  }
191 #endif
192 
193  s->nb_failed_requests = 0;
194 
195  if (!frame)
196  return av_buffersrc_close(ctx, s->last_pts, flags);
197  if (s->eof)
198  return AVERROR_EOF;
199 
200  s->last_pts = frame->pts + frame->duration;
201 
202  refcounted = !!frame->buf[0];
203 
205 
206  switch (ctx->outputs[0]->type) {
207  case AVMEDIA_TYPE_VIDEO:
209  frame->format, frame->pts);
210  break;
211  case AVMEDIA_TYPE_AUDIO:
212  /* For layouts unknown on input but known on link after negotiation. */
213 #if FF_API_OLD_CHANNEL_LAYOUT
215  if (!frame->channel_layout)
216  frame->channel_layout = s->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
217  s->ch_layout.u.mask : 0;
219 #endif
221  ret = av_channel_layout_copy(&frame->ch_layout, &s->ch_layout);
222  if (ret < 0)
223  return ret;
224  }
226  frame->format, frame->pts);
227  break;
228  default:
229  return AVERROR(EINVAL);
230  }
231 
232  }
233 
234  if (refcounted && !(flags & AV_BUFFERSRC_FLAG_KEEP_REF)) {
235  if (!(copy = av_frame_alloc()))
236  return AVERROR(ENOMEM);
238  } else {
240  if (!copy)
241  return AVERROR(ENOMEM);
242  }
243 
244 #if FF_API_PKT_DURATION
246  if (copy->pkt_duration && copy->pkt_duration != copy->duration)
247  copy->duration = copy->pkt_duration;
249 #endif
250 
251 #if FF_API_INTERLACED_FRAME
253  if (copy->interlaced_frame)
254  copy->flags |= AV_FRAME_FLAG_INTERLACED;
255  if (copy->top_field_first)
258 #endif
259 
260 #if FF_API_FRAME_KEY
262  if (copy->key_frame)
263  copy->flags |= AV_FRAME_FLAG_KEY;
265 #endif
266 
267  ret = ff_filter_frame(ctx->outputs[0], copy);
268  if (ret < 0)
269  return ret;
270 
271  if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {
272  ret = push_frame(ctx->graph);
273  if (ret < 0)
274  return ret;
275  }
276 
277  return 0;
278 }
279 
281 {
282  BufferSourceContext *s = ctx->priv;
283 
284  s->eof = 1;
286  return (flags & AV_BUFFERSRC_FLAG_PUSH) ? push_frame(ctx->graph) : 0;
287 }
288 
290 {
291  BufferSourceContext *c = ctx->priv;
292 
293  if (c->pix_fmt == AV_PIX_FMT_NONE) {
294  av_log(ctx, AV_LOG_ERROR, "Unspecified pixel format\n");
295  return AVERROR(EINVAL);
296  }
297  if (c->w <= 0 || c->h <= 0) {
298  av_log(ctx, AV_LOG_ERROR, "Invalid size %dx%d\n", c->w, c->h);
299  return AVERROR(EINVAL);
300  }
301  if (av_q2d(c->time_base) <= 0) {
302  av_log(ctx, AV_LOG_ERROR, "Invalid time base %d/%d\n", c->time_base.num, c->time_base.den);
303  return AVERROR(EINVAL);
304  }
305 
306  av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s tb:%d/%d fr:%d/%d sar:%d/%d\n",
307  c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
308  c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
309  c->pixel_aspect.num, c->pixel_aspect.den);
310 
311  return 0;
312 }
313 
315 {
316  return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
317 }
318 
319 #define OFFSET(x) offsetof(BufferSourceContext, x)
320 #define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
321 #define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
322 
323 static const AVOption buffer_options[] = {
324  { "width", NULL, OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
325  { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = V },
326  { "height", NULL, OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
327  { "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 },
328  { "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
329  { "pixel_aspect", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
330  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
331  { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
332  { NULL },
333 };
334 
336 
337 static const AVOption abuffer_options[] = {
338  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
339  { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
340  { "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 },
341  { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
342  { "channels", NULL, OFFSET(channels), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
343  { NULL },
344 };
345 
346 AVFILTER_DEFINE_CLASS(abuffer);
347 
349 {
350  BufferSourceContext *s = ctx->priv;
351  char buf[128];
352  int ret = 0;
353 
354  if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
355  av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");
356  return AVERROR(EINVAL);
357  }
358 
359  if (s->channel_layout_str || s->ch_layout.nb_channels) {
360  int n;
361 
362  if (!s->ch_layout.nb_channels) {
363  ret = av_channel_layout_from_string(&s->ch_layout, s->channel_layout_str);
364  if (ret < 0) {
365 #if FF_API_OLD_CHANNEL_LAYOUT
366  uint64_t mask;
368  mask = av_get_channel_layout(s->channel_layout_str);
369  if (!mask) {
370 #endif
371  av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
372  s->channel_layout_str);
373  return AVERROR(EINVAL);
374 #if FF_API_OLD_CHANNEL_LAYOUT
375  }
377  av_log(ctx, AV_LOG_WARNING, "Channel layout '%s' uses a deprecated syntax.\n",
378  s->channel_layout_str);
379  av_channel_layout_from_mask(&s->ch_layout, mask);
380 #endif
381  }
382  }
383 
384  n = s->ch_layout.nb_channels;
385  av_channel_layout_describe(&s->ch_layout, buf, sizeof(buf));
386  if (s->channels) {
387  if (n != s->channels) {
389  "Mismatching channel count %d and layout '%s' "
390  "(%d channels)\n",
391  s->channels, buf, n);
392  return AVERROR(EINVAL);
393  }
394  }
395  s->channels = n;
396  } else if (!s->channels) {
397  av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
398  "channel layout specified\n");
399  return AVERROR(EINVAL);
400  } else {
401  s->ch_layout = FF_COUNT2LAYOUT(s->channels);
402  av_channel_layout_describe(&s->ch_layout, buf, sizeof(buf));
403  }
404 
405  if (!s->time_base.num)
406  s->time_base = (AVRational){1, s->sample_rate};
407 
409  "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
410  s->time_base.num, s->time_base.den, av_get_sample_fmt_name(s->sample_fmt),
411  s->sample_rate, buf);
412 
413  return ret;
414 }
415 
417 {
418  BufferSourceContext *s = ctx->priv;
419  av_buffer_unref(&s->hw_frames_ctx);
420  av_channel_layout_uninit(&s->ch_layout);
421 }
422 
424 {
425  BufferSourceContext *c = ctx->priv;
428  AVFilterFormats *samplerates = NULL;
429  int ret;
430 
431  switch (ctx->outputs[0]->type) {
432  case AVMEDIA_TYPE_VIDEO:
433  if ((ret = ff_add_format (&formats, c->pix_fmt)) < 0 ||
434  (ret = ff_set_common_formats (ctx , formats )) < 0)
435  return ret;
436  break;
437  case AVMEDIA_TYPE_AUDIO:
438  if ((ret = ff_add_format (&formats , c->sample_fmt )) < 0 ||
439  (ret = ff_set_common_formats (ctx , formats )) < 0 ||
440  (ret = ff_add_format (&samplerates, c->sample_rate)) < 0 ||
441  (ret = ff_set_common_samplerates (ctx , samplerates )) < 0)
442  return ret;
443 
444  if ((ret = ff_add_channel_layout(&channel_layouts, &c->ch_layout)) < 0)
445  return ret;
447  return ret;
448  break;
449  default:
450  return AVERROR(EINVAL);
451  }
452 
453  return 0;
454 }
455 
457 {
458  BufferSourceContext *c = link->src->priv;
459 
460  switch (link->type) {
461  case AVMEDIA_TYPE_VIDEO:
462  link->w = c->w;
463  link->h = c->h;
464  link->sample_aspect_ratio = c->pixel_aspect;
465 
466  if (c->hw_frames_ctx) {
467  link->hw_frames_ctx = av_buffer_ref(c->hw_frames_ctx);
468  if (!link->hw_frames_ctx)
469  return AVERROR(ENOMEM);
470  }
471  break;
472  case AVMEDIA_TYPE_AUDIO:
473  if (!c->ch_layout.nb_channels) {
474  int ret = av_channel_layout_copy(&c->ch_layout, &link->ch_layout);
475  if (ret < 0)
476  return ret;
477  }
478  break;
479  default:
480  return AVERROR(EINVAL);
481  }
482 
483  link->time_base = c->time_base;
484  link->frame_rate = c->frame_rate;
485  return 0;
486 }
487 
489 {
490  AVFilterLink *outlink = ctx->outputs[0];
491  BufferSourceContext *c = ctx->priv;
492 
493  if (!c->eof && ff_outlink_get_status(outlink)) {
494  c->eof = 1;
495  return 0;
496  }
497 
498  if (c->eof) {
499  ff_outlink_set_status(outlink, AVERROR_EOF, c->last_pts);
500  return 0;
501  }
502  c->nb_failed_requests++;
503  return FFERROR_NOT_READY;
504 }
505 
507  {
508  .name = "default",
509  .type = AVMEDIA_TYPE_VIDEO,
510  .config_props = config_props,
511  },
512 };
513 
515  .name = "buffer",
516  .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
517  .priv_size = sizeof(BufferSourceContext),
518  .activate = activate,
519  .init = init_video,
520  .uninit = uninit,
521 
522  .inputs = NULL,
525  .priv_class = &buffer_class,
526 };
527 
529  {
530  .name = "default",
531  .type = AVMEDIA_TYPE_AUDIO,
532  .config_props = config_props,
533  },
534 };
535 
537  .name = "abuffer",
538  .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
539  .priv_size = sizeof(BufferSourceContext),
540  .activate = activate,
541  .init = init_audio,
542  .uninit = uninit,
543 
544  .inputs = NULL,
547  .priv_class = &abuffer_class,
548 };
formats
formats
Definition: signature.h:48
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:73
AVFilterChannelLayouts
A list of supported channel layouts.
Definition: formats.h:85
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
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:237
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(buffer)
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:978
AVFrame::duration
int64_t duration
Duration of the frame, in the same units as pts.
Definition: frame.h:807
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
FFERROR_NOT_READY
return FFERROR_NOT_READY
Definition: filter_design.txt:204
A
#define A
Definition: buffersrc.c:320
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:452
AVFrame::width
int width
Definition: frame.h:412
w
uint8_t w
Definition: llviddspenc.c:38
AVOption
AVOption.
Definition: opt.h:251
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:158
FILTER_QUERY_FUNC
#define FILTER_QUERY_FUNC(func)
Definition: internal.h:169
OFFSET
#define OFFSET(x)
Definition: buffersrc.c:319
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
float.h
CHECK_AUDIO_PARAM_CHANGE
#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, layout, format, pts)
Definition: buffersrc.c:75
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:1341
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:314
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:60
AVChannelLayout::mask
uint64_t mask
This member must be used for AV_CHANNEL_ORDER_NATIVE, and may be used for AV_CHANNEL_ORDER_AMBISONIC ...
Definition: channel_layout.h:341
AV_OPT_TYPE_RATIONAL
@ AV_OPT_TYPE_RATIONAL
Definition: opt.h:230
av_get_channel_layout_nb_channels
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
Definition: channel_layout.c:330
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:319
abuffer_options
static const AVOption abuffer_options[]
Definition: buffersrc.c:337
video.h
AVFrame::buf
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:590
AVBufferSrcParameters::height
int height
Definition: buffersrc.h:87
sample_rate
sample_rate
Definition: ffmpeg_filter.c:368
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:641
formats.h
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: buffersrc.c:416
AVFilterContext::priv
void * priv
private data for use by the filter
Definition: avfilter.h:412
AVBufferSrcParameters::sample_aspect_ratio
AVRational sample_aspect_ratio
Video only, the sample (pixel) aspect ratio.
Definition: buffersrc.h:92
BufferSourceContext::frame_rate
AVRational frame_rate
frame_rate to set in the output link
Definition: buffersrc.c:47
samplefmt.h
ff_vsrc_buffer
const AVFilter ff_vsrc_buffer
Definition: buffersrc.c:514
AVFrame::ch_layout
AVChannelLayout ch_layout
Channel layout of the audio data.
Definition: frame.h:802
pts
static int64_t pts
Definition: transcode_aac.c:643
AVFrame::channels
attribute_deprecated int channels
number of audio channels, only used for audio.
Definition: frame.h:731
AVRational::num
int num
Numerator.
Definition: rational.h:59
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:47
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:88
BufferSourceContext::sample_rate
int sample_rate
Definition: buffersrc.c:58
AVBufferSrcParameters::ch_layout
AVChannelLayout ch_layout
Audio only, the audio channel layout.
Definition: buffersrc.h:125
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
AVFrame::channel_layout
attribute_deprecated uint64_t channel_layout
Channel layout of the audio data.
Definition: frame.h:575
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:770
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:628
mask
static const uint16_t mask[17]
Definition: lzw.c:38
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:788
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:51
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
av_channel_layout_from_mask
FF_ENABLE_DEPRECATION_WARNINGS int av_channel_layout_from_mask(AVChannelLayout *channel_layout, uint64_t mask)
Initialize a native channel layout from a bitmask indicating which channels are present.
Definition: channel_layout.c:401
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts_bsf.c:365
push_frame
static int push_frame(AVFilterGraph *graph)
Definition: buffersrc.c:163
BufferSourceContext
Definition: buffersrc.c:44
avfilter_vsrc_buffer_outputs
static const AVFilterPad avfilter_vsrc_buffer_outputs[]
Definition: buffersrc.c:506
BufferSourceContext::ch_layout
AVChannelLayout ch_layout
Definition: buffersrc.c:62
filters.h
ctx
AVFormatContext * ctx
Definition: movenc.c:48
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
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
buffer_options
static const AVOption buffer_options[]
Definition: buffersrc.c:323
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
frame
static AVFrame * frame
Definition: demux_decode.c:54
BufferSourceContext::eof
int eof
Definition: buffersrc.c:64
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:65
AV_OPT_TYPE_IMAGE_SIZE
@ AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:235
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:470
BufferSourceContext::nb_failed_requests
unsigned nb_failed_requests
Definition: buffersrc.c:48
AV_BUFFERSRC_FLAG_KEEP_REF
@ AV_BUFFERSRC_FLAG_KEEP_REF
Keep a reference to the frame.
Definition: buffersrc.h:53
AVFilterGraph
Definition: avfilter.h:864
av_get_channel_layout
uint64_t av_get_channel_layout(const char *name)
Return a channel layout id that matches name, or 0 if no match is found.
Definition: channel_layout.c:249
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:487
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:53
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:280
V
#define V
Definition: buffersrc.c:321
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:106
copy
static void copy(const float *p1, float *p2, const int length)
Definition: vf_vaguedenoiser.c:185
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:309
av_buffersrc_parameters_alloc
AVBufferSrcParameters * av_buffersrc_parameters_alloc(void)
Allocate a new AVBufferSrcParameters instance.
Definition: buffersrc.c:85
AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT
@ AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT
Do not check for format changes.
Definition: buffersrc.h:41
AVFrame::sample_rate
int sample_rate
Sample rate of the audio data.
Definition: frame.h:567
BufferSourceContext::hw_frames_ctx
AVBufferRef * hw_frames_ctx
Definition: buffersrc.c:55
config_props
static int config_props(AVFilterLink *link)
Definition: buffersrc.c:456
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:467
AVFrame::format
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:427
frame.h
AVBufferSrcParameters::time_base
AVRational time_base
The timebase to be used for the timestamps on the input frames.
Definition: buffersrc.h:82
init_audio
static av_cold int init_audio(AVFilterContext *ctx)
Definition: buffersrc.c:348
AV_CHANNEL_ORDER_NATIVE
@ AV_CHANNEL_ORDER_NATIVE
The native channel order, i.e.
Definition: channel_layout.h:118
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: buffersrc.c:423
internal.h
CHECK_VIDEO_PARAM_CHANGE
#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, pts)
Definition: buffersrc.c:68
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:414
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:96
BufferSourceContext::w
int w
Definition: buffersrc.c:51
BufferSourceContext::pix_fmt
enum AVPixelFormat pix_fmt
Definition: buffersrc.c:52
AVBufferSrcParameters::width
int width
Video only, the display dimensions of the input frames.
Definition: buffersrc.h:87
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:234
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:177
common.h
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
init_video
static av_cold int init_video(AVFilterContext *ctx)
Definition: buffersrc.c:289
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:254
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:53
activate
static int activate(AVFilterContext *ctx)
Definition: buffersrc.c:488
AV_FRAME_FLAG_INTERLACED
#define AV_FRAME_FLAG_INTERLACED
A flag to mark frames whose content is interlaced.
Definition: frame.h:636
AVFilter
Filter definition.
Definition: avfilter.h:166
ret
ret
Definition: filter_design.txt:187
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:447
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:752
AVFrame::height
int height
Definition: frame.h:412
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:65
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
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:642
AV_BUFFERSRC_FLAG_PUSH
@ AV_BUFFERSRC_FLAG_PUSH
Immediately push the frame to the output.
Definition: buffersrc.h:46
AV_OPT_TYPE_PIXEL_FMT
@ AV_OPT_TYPE_PIXEL_FMT
Definition: opt.h:236
ff_outlink_get_status
int ff_outlink_get_status(AVFilterLink *link)
Get the status on an output link.
Definition: avfilter.c:1529
AVFilterContext
An instance of a filter.
Definition: avfilter.h:397
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:649
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:314
audio.h
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
BufferSourceContext::channel_layout_str
char * channel_layout_str
Definition: buffersrc.c:61
channel_layouts
static const uint16_t channel_layouts[7]
Definition: dca_lbr.c:111
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:193
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:152
imgutils.h
timestamp.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
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:536
AVChannelLayout::u
union AVChannelLayout::@334 u
Details about which channels are present in this layout.
ff_set_common_samplerates
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:747
h
h
Definition: vp9dsp_template.c:2038
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
buffersrc.h
BufferSourceContext::sample_fmt
enum AVSampleFormat sample_fmt
Definition: buffersrc.c:59
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:2884
avfilter_asrc_abuffer_outputs
static const AVFilterPad avfilter_asrc_abuffer_outputs[]
Definition: buffersrc.c:528
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:729