FFmpeg  4.2.2
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/fifo.h"
31 #include "libavutil/frame.h"
32 #include "libavutil/imgutils.h"
33 #include "libavutil/internal.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/samplefmt.h"
36 #include "libavutil/timestamp.h"
37 #include "audio.h"
38 #include "avfilter.h"
39 #include "buffersrc.h"
40 #include "formats.h"
41 #include "internal.h"
42 #include "video.h"
43 
44 typedef struct BufferSourceContext {
45  const AVClass *class;
47  AVRational time_base; ///< time_base to set in the output link
48  AVRational frame_rate; ///< frame_rate to set in the output link
50  unsigned warning_limit;
51 
52  /* video only */
53  int w, h;
56  char *sws_param;
57 
59 
60  /* audio only */
63  int channels;
64  uint64_t channel_layout;
66 
68  int eof;
70 
71 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, pts)\
72  if (c->w != width || c->h != height || c->pix_fmt != format) {\
73  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",\
74  c->w, c->h, c->pix_fmt, width, height, format, av_ts2timestr(pts, &s->outputs[0]->time_base));\
75  av_log(s, AV_LOG_WARNING, "Changing video frame properties on the fly is not supported by all filters.\n");\
76  }
77 
78 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format, pts)\
79  if (c->sample_fmt != format || c->sample_rate != srate ||\
80  c->channel_layout != ch_layout || c->channels != ch_count) {\
81  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",\
82  av_get_sample_fmt_name(c->sample_fmt), c->sample_rate, c->channel_layout, c->channels,\
83  av_get_sample_fmt_name(format), srate, ch_layout, ch_count, av_ts2timestr(pts, &s->outputs[0]->time_base));\
84  av_log(s, AV_LOG_ERROR, "Changing audio frame properties on the fly is not supported.\n");\
85  return AVERROR(EINVAL);\
86  }
87 
89 {
90  AVBufferSrcParameters *par = av_mallocz(sizeof(*par));
91  if (!par)
92  return NULL;
93 
94  par->format = -1;
95 
96  return par;
97 }
98 
100 {
101  BufferSourceContext *s = ctx->priv;
102 
103  if (param->time_base.num > 0 && param->time_base.den > 0)
104  s->time_base = param->time_base;
105 
106  switch (ctx->filter->outputs[0].type) {
107  case AVMEDIA_TYPE_VIDEO:
108  if (param->format != AV_PIX_FMT_NONE) {
109  s->got_format_from_params = 1;
110  s->pix_fmt = param->format;
111  }
112  if (param->width > 0)
113  s->w = param->width;
114  if (param->height > 0)
115  s->h = param->height;
116  if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)
117  s->pixel_aspect = param->sample_aspect_ratio;
118  if (param->frame_rate.num > 0 && param->frame_rate.den > 0)
119  s->frame_rate = param->frame_rate;
120  if (param->hw_frames_ctx) {
123  if (!s->hw_frames_ctx)
124  return AVERROR(ENOMEM);
125  }
126  break;
127  case AVMEDIA_TYPE_AUDIO:
128  if (param->format != AV_SAMPLE_FMT_NONE) {
129  s->got_format_from_params = 1;
130  s->sample_fmt = param->format;
131  }
132  if (param->sample_rate > 0)
133  s->sample_rate = param->sample_rate;
134  if (param->channel_layout)
135  s->channel_layout = param->channel_layout;
136  break;
137  default:
138  return AVERROR_BUG;
139  }
140 
141  return 0;
142 }
143 
145 {
146  return av_buffersrc_add_frame_flags(ctx, (AVFrame *)frame,
148 }
149 
151 {
152  return av_buffersrc_add_frame_flags(ctx, frame, 0);
153 }
154 
156  AVFrame *frame, int flags);
157 
159 {
160  AVFrame *copy = NULL;
161  int ret = 0;
162 
163  if (frame && frame->channel_layout &&
165  av_log(ctx, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");
166  return AVERROR(EINVAL);
167  }
168 
169  if (!(flags & AV_BUFFERSRC_FLAG_KEEP_REF) || !frame)
170  return av_buffersrc_add_frame_internal(ctx, frame, flags);
171 
172  if (!(copy = av_frame_alloc()))
173  return AVERROR(ENOMEM);
174  ret = av_frame_ref(copy, frame);
175  if (ret >= 0)
176  ret = av_buffersrc_add_frame_internal(ctx, copy, flags);
177 
178  av_frame_free(&copy);
179  return ret;
180 }
181 
182 static int push_frame(AVFilterGraph *graph)
183 {
184  int ret;
185 
186  while (1) {
187  ret = ff_filter_graph_run_once(graph);
188  if (ret == AVERROR(EAGAIN))
189  break;
190  if (ret < 0)
191  return ret;
192  }
193  return 0;
194 }
195 
197  AVFrame *frame, int flags)
198 {
199  BufferSourceContext *s = ctx->priv;
200  AVFrame *copy;
201  int refcounted, ret;
202 
203  s->nb_failed_requests = 0;
204 
205  if (!frame)
206  return av_buffersrc_close(ctx, AV_NOPTS_VALUE, flags);
207  if (s->eof)
208  return AVERROR(EINVAL);
209 
210  refcounted = !!frame->buf[0];
211 
212  if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
213 
214  switch (ctx->outputs[0]->type) {
215  case AVMEDIA_TYPE_VIDEO:
216  CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
217  frame->format, frame->pts);
218  break;
219  case AVMEDIA_TYPE_AUDIO:
220  /* For layouts unknown on input but known on link after negotiation. */
221  if (!frame->channel_layout)
222  frame->channel_layout = s->channel_layout;
223  CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
224  frame->channels, frame->format, frame->pts);
225  break;
226  default:
227  return AVERROR(EINVAL);
228  }
229 
230  }
231 
232  if (!av_fifo_space(s->fifo) &&
233  (ret = av_fifo_realloc2(s->fifo, av_fifo_size(s->fifo) +
234  sizeof(copy))) < 0)
235  return ret;
236 
237  if (!(copy = av_frame_alloc()))
238  return AVERROR(ENOMEM);
239 
240  if (refcounted) {
241  av_frame_move_ref(copy, frame);
242  } else {
243  ret = av_frame_ref(copy, frame);
244  if (ret < 0) {
245  av_frame_free(&copy);
246  return ret;
247  }
248  }
249 
250  if ((ret = av_fifo_generic_write(s->fifo, &copy, sizeof(copy), NULL)) < 0) {
251  if (refcounted)
252  av_frame_move_ref(frame, copy);
253  av_frame_free(&copy);
254  return ret;
255  }
256 
257  if ((ret = ctx->output_pads[0].request_frame(ctx->outputs[0])) < 0)
258  return ret;
259 
260  if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {
261  ret = push_frame(ctx->graph);
262  if (ret < 0)
263  return ret;
264  }
265 
266  return 0;
267 }
268 
269 int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags)
270 {
271  BufferSourceContext *s = ctx->priv;
272 
273  s->eof = 1;
275  return (flags & AV_BUFFERSRC_FLAG_PUSH) ? push_frame(ctx->graph) : 0;
276 }
277 
279 {
280  BufferSourceContext *c = ctx->priv;
281 
282  if (!(c->pix_fmt != AV_PIX_FMT_NONE || c->got_format_from_params) || !c->w || !c->h ||
283  av_q2d(c->time_base) <= 0) {
284  av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");
285  return AVERROR(EINVAL);
286  }
287 
288  if (!(c->fifo = av_fifo_alloc(sizeof(AVFrame*))))
289  return AVERROR(ENOMEM);
290 
291  av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s tb:%d/%d fr:%d/%d sar:%d/%d sws_param:%s\n",
292  c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
294  c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));
295  c->warning_limit = 100;
296  return 0;
297 }
298 
300 {
301  return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
302 }
303 
304 #define OFFSET(x) offsetof(BufferSourceContext, x)
305 #define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
306 #define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
307 
308 static const AVOption buffer_options[] = {
309  { "width", NULL, OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
310  { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = V },
311  { "height", NULL, OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
312  { "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 },
313  { "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
314  { "pixel_aspect", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
315  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
316  { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
317  { "sws_param", NULL, OFFSET(sws_param), AV_OPT_TYPE_STRING, .flags = V },
318  { NULL },
319 };
320 
322 
323 static const AVOption abuffer_options[] = {
324  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
325  { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
326  { "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 },
327  { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
328  { "channels", NULL, OFFSET(channels), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
329  { NULL },
330 };
331 
332 AVFILTER_DEFINE_CLASS(abuffer);
333 
335 {
336  BufferSourceContext *s = ctx->priv;
337  int ret = 0;
338 
340  av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");
341  return AVERROR(EINVAL);
342  }
343 
344  if (s->channel_layout_str || s->channel_layout) {
345  int n;
346 
347  if (!s->channel_layout) {
349  if (!s->channel_layout) {
350  av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
351  s->channel_layout_str);
352  return AVERROR(EINVAL);
353  }
354  }
356  if (s->channels) {
357  if (n != s->channels) {
358  av_log(ctx, AV_LOG_ERROR,
359  "Mismatching channel count %d and layout '%s' "
360  "(%d channels)\n",
361  s->channels, s->channel_layout_str, n);
362  return AVERROR(EINVAL);
363  }
364  }
365  s->channels = n;
366  } else if (!s->channels) {
367  av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
368  "channel layout specified\n");
369  return AVERROR(EINVAL);
370  }
371 
372  if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*))))
373  return AVERROR(ENOMEM);
374 
375  if (!s->time_base.num)
376  s->time_base = (AVRational){1, s->sample_rate};
377 
378  av_log(ctx, AV_LOG_VERBOSE,
379  "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
382  s->warning_limit = 100;
383 
384  return ret;
385 }
386 
387 static av_cold void uninit(AVFilterContext *ctx)
388 {
389  BufferSourceContext *s = ctx->priv;
390  while (s->fifo && av_fifo_size(s->fifo)) {
391  AVFrame *frame;
392  av_fifo_generic_read(s->fifo, &frame, sizeof(frame), NULL);
393  av_frame_free(&frame);
394  }
396  av_fifo_freep(&s->fifo);
397 }
398 
400 {
401  BufferSourceContext *c = ctx->priv;
404  AVFilterFormats *samplerates = NULL;
405  int ret;
406 
407  switch (ctx->outputs[0]->type) {
408  case AVMEDIA_TYPE_VIDEO:
409  if ((ret = ff_add_format (&formats, c->pix_fmt)) < 0 ||
410  (ret = ff_set_common_formats (ctx , formats )) < 0)
411  return ret;
412  break;
413  case AVMEDIA_TYPE_AUDIO:
414  if ((ret = ff_add_format (&formats , c->sample_fmt )) < 0 ||
415  (ret = ff_set_common_formats (ctx , formats )) < 0 ||
416  (ret = ff_add_format (&samplerates, c->sample_rate)) < 0 ||
417  (ret = ff_set_common_samplerates (ctx , samplerates )) < 0)
418  return ret;
419 
420  if ((ret = ff_add_channel_layout(&channel_layouts,
422  FF_COUNT2LAYOUT(c->channels))) < 0)
423  return ret;
424  if ((ret = ff_set_common_channel_layouts(ctx, channel_layouts)) < 0)
425  return ret;
426  break;
427  default:
428  return AVERROR(EINVAL);
429  }
430 
431  return 0;
432 }
433 
434 static int config_props(AVFilterLink *link)
435 {
436  BufferSourceContext *c = link->src->priv;
437 
438  switch (link->type) {
439  case AVMEDIA_TYPE_VIDEO:
440  link->w = c->w;
441  link->h = c->h;
443 
444  if (c->hw_frames_ctx) {
446  if (!link->hw_frames_ctx)
447  return AVERROR(ENOMEM);
448  }
449  break;
450  case AVMEDIA_TYPE_AUDIO:
451  if (!c->channel_layout)
452  c->channel_layout = link->channel_layout;
453  break;
454  default:
455  return AVERROR(EINVAL);
456  }
457 
458  link->time_base = c->time_base;
459  link->frame_rate = c->frame_rate;
460  return 0;
461 }
462 
463 static int request_frame(AVFilterLink *link)
464 {
465  BufferSourceContext *c = link->src->priv;
466  AVFrame *frame;
467  int ret;
468 
469  if (!av_fifo_size(c->fifo)) {
470  if (c->eof)
471  return AVERROR_EOF;
472  c->nb_failed_requests++;
473  return AVERROR(EAGAIN);
474  }
475  av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);
476 
477  ret = ff_filter_frame(link, frame);
478 
479  return ret;
480 }
481 
482 static int poll_frame(AVFilterLink *link)
483 {
484  BufferSourceContext *c = link->src->priv;
485  int size = av_fifo_size(c->fifo);
486  if (!size && c->eof)
487  return AVERROR_EOF;
488  return size/sizeof(AVFrame*);
489 }
490 
492  {
493  .name = "default",
494  .type = AVMEDIA_TYPE_VIDEO,
495  .request_frame = request_frame,
496  .poll_frame = poll_frame,
497  .config_props = config_props,
498  },
499  { NULL }
500 };
501 
503  .name = "buffer",
504  .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
505  .priv_size = sizeof(BufferSourceContext),
507 
508  .init = init_video,
509  .uninit = uninit,
510 
511  .inputs = NULL,
512  .outputs = avfilter_vsrc_buffer_outputs,
513  .priv_class = &buffer_class,
514 };
515 
517  {
518  .name = "default",
519  .type = AVMEDIA_TYPE_AUDIO,
520  .request_frame = request_frame,
521  .poll_frame = poll_frame,
522  .config_props = config_props,
523  },
524  { NULL }
525 };
526 
528  .name = "abuffer",
529  .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
530  .priv_size = sizeof(BufferSourceContext),
532 
533  .init = init_audio,
534  .uninit = uninit,
535 
536  .inputs = NULL,
537  .outputs = avfilter_asrc_abuffer_outputs,
538  .priv_class = &abuffer_class,
539 };
#define NULL
Definition: coverity.c:32
int ff_set_common_channel_layouts(AVFilterContext *ctx, AVFilterChannelLayouts *layouts)
A helper for query_formats() which sets all links to the same list of channel layouts/sample rates...
Definition: formats.c:549
static void copy(const float *p1, float *p2, const int length)
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:125
int size
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format, pts)
Definition: buffersrc.c:78
AVOption.
Definition: opt.h:246
AVRational pixel_aspect
Definition: buffersrc.c:55
misc image utilities
Main libavfilter public API header.
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:486
Memory buffer source API.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
channels
Definition: aptx.c:30
int num
Numerator.
Definition: rational.h:59
Keep a reference to the frame.
Definition: buffersrc.h:53
static av_cold int init_video(AVFilterContext *ctx)
Definition: buffersrc.c:278
static const AVFilterPad avfilter_vsrc_buffer_outputs[]
Definition: buffersrc.c:491
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:65
void av_frame_move_ref(AVFrame *dst, AVFrame *src)
Move everything contained in src to dst and reset src.
Definition: frame.c:582
enum AVPixelFormat pix_fmt
Definition: buffersrc.c:54
static av_cold void uninit(AVFilterContext *ctx)
Definition: buffersrc.c:387
AVRational frame_rate
Video only, the frame rate of the input video.
Definition: buffersrc.h:100
#define OFFSET(x)
Definition: buffersrc.c:304
int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int(*func)(void *, void *, int))
Feed data from a user-supplied callback to an AVFifoBuffer.
Definition: fifo.c:122
AVFilter ff_asrc_abuffer
Definition: buffersrc.c:527
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
int got_format_from_params
Definition: buffersrc.c:67
struct AVFilterGraph * graph
filtergraph this filter belongs to
Definition: avfilter.h:355
const char * name
Pad name.
Definition: internal.h:60
AVRational sample_aspect_ratio
Video only, the sample (pixel) aspect ratio.
Definition: buffersrc.h:92
uint64_t av_get_channel_layout(const char *name)
Return a channel layout id that matches name, or 0 if no match is found.
int ff_filter_graph_run_once(AVFilterGraph *graph)
Run one round of processing on a filter graph.
static const AVOption abuffer_options[]
Definition: buffersrc.c:323
unsigned warning_limit
Definition: buffersrc.c:50
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1080
AVFilterPad * output_pads
array of output pads
Definition: avfilter.h:349
static char buffer[20]
Definition: seek.c:32
#define av_cold
Definition: attributes.h:82
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:189
AVOptions.
timestamp utils, mostly useful for debugging/logging purposes
AVRational time_base
The timebase to be used for the timestamps on the input frames.
Definition: buffersrc.h:82
static int poll_frame(AVFilterLink *link)
Definition: buffersrc.c:482
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:443
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:388
#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, pts)
Definition: buffersrc.c:71
int av_fifo_space(const AVFifoBuffer *f)
Return the amount of space in bytes in the AVFifoBuffer, that is the amount of data you can write int...
Definition: fifo.c:82
Do not check for format changes.
Definition: buffersrc.h:41
static AVFrame * frame
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
int sample_rate
Audio only, the audio sampling rate in samples per second.
Definition: buffersrc.h:111
static const AVFilterPad avfilter_asrc_abuffer_outputs[]
Definition: buffersrc.c:516
#define av_log(a,...)
A filter pad used for either input or output.
Definition: internal.h:54
static void * av_x_if_null(const void *p, const void *x)
Return x default pointer in case p is NULL.
Definition: avutil.h:308
int width
Definition: frame.h:353
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
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:568
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
Definition: formats.c:343
#define AVERROR(e)
Definition: error.h:43
uint64_t channel_layout
Audio only, the audio channel layout.
Definition: buffersrc.h:116
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
static int request_frame(AVFilterLink *link)
Definition: buffersrc.c:463
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
void * priv
private data for use by the filter
Definition: avfilter.h:353
int av_fifo_generic_read(AVFifoBuffer *f, void *dest, int buf_size, void(*func)(void *, void *, int))
Feed data from an AVFifoBuffer to a user-supplied callback.
Definition: fifo.c:213
int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags)
Close the buffer source after EOF.
Definition: buffersrc.c:269
#define A
Definition: buffersrc.c:305
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:337
AVRational time_base
time_base to set in the output link
Definition: buffersrc.c:47
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:49
int format
video: the pixel format, value corresponds to enum AVPixelFormat audio: the sample format...
Definition: buffersrc.h:78
AVRational frame_rate
frame_rate to set in the output link
Definition: buffersrc.c:48
reference-counted frame API
uint64_t channel_layout
Channel layout of the audio data.
Definition: frame.h:472
common internal API header
AVFILTER_DEFINE_CLASS(buffer)
int channels
number of audio channels, only used for audio.
Definition: frame.h:601
audio channel layout utility functions
This structure contains the parameters describing the frames that will be passed to this filter...
Definition: buffersrc.h:73
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
int n
Definition: avisynth_c.h:760
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static av_cold int init_audio(AVFilterContext *ctx)
Definition: buffersrc.c:334
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
A list of supported channel layouts.
Definition: formats.h:85
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:368
#define attribute_align_arg
Definition: internal.h:62
AVBufferRef * hw_frames_ctx
Video with a hwaccel pixel format only.
Definition: buffersrc.h:106
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
int av_fifo_size(const AVFifoBuffer *f)
Return the amount of data in bytes in the AVFifoBuffer, that is the amount of data you can read from ...
Definition: fifo.c:77
static const AVOption buffer_options[]
Definition: buffersrc.c:308
int av_fifo_realloc2(AVFifoBuffer *f, unsigned int new_size)
Resize an AVFifoBuffer.
Definition: fifo.c:87
a very simple circular buffer FIFO implementation
#define V
Definition: buffersrc.c:306
static int push_frame(AVFilterGraph *graph)
Definition: buffersrc.c:182
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:50
static const uint16_t channel_layouts[7]
Definition: dca_lbr.c:113
Describe the class of an AVClass context structure.
Definition: log.h:67
int sample_rate
Sample rate of the audio data.
Definition: frame.h:467
Filter definition.
Definition: avfilter.h:144
Rational number (pair of numerator and denominator).
Definition: rational.h:58
static int config_props(AVFilterLink *link)
Definition: buffersrc.c:434
const char * name
Filter name.
Definition: avfilter.h:148
static int av_buffersrc_add_frame_internal(AVFilterContext *ctx, AVFrame *frame, int flags)
Definition: buffersrc.c:196
offset must point to two consecutive integers
Definition: opt.h:233
AVFifoBuffer * fifo
Definition: buffersrc.c:46
unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
Get the number of failed requests.
Definition: buffersrc.c:299
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
uint64_t channel_layout
Definition: buffersrc.c:64
static int64_t pts
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVBufferRef * hw_frames_ctx
Definition: buffersrc.c:58
int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
Add a frame to the buffer source.
Definition: buffersrc.c:144
AVFilter ff_vsrc_buffer
Definition: buffersrc.c:502
A reference to a data buffer.
Definition: buffer.h:81
common internal and external API header
static double c[64]
int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param)
Initialize the buffersrc or abuffersrc filter with the provided parameters.
Definition: buffersrc.c:99
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:93
int den
Denominator.
Definition: rational.h:60
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:158
unsigned nb_failed_requests
Definition: buffersrc.c:49
AVFifoBuffer * av_fifo_alloc(unsigned int size)
Initialize an AVFifoBuffer.
Definition: fifo.c:43
enum AVSampleFormat sample_fmt
Definition: buffersrc.c:62
static int query_formats(AVFilterContext *ctx)
Definition: buffersrc.c:399
A list of supported formats for one end of a filter link.
Definition: formats.h:64
AVBufferSrcParameters * av_buffersrc_parameters_alloc(void)
Allocate a new AVBufferSrcParameters instance.
Definition: buffersrc.c:88
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:211
int(* request_frame)(AVFilterLink *link)
Frame request callback.
Definition: internal.h:113
An instance of a filter.
Definition: avfilter.h:338
int height
Definition: frame.h:353
const AVFilterPad * outputs
List of outputs, terminated by a zeroed element.
Definition: avfilter.h:172
#define FF_COUNT2LAYOUT(c)
Encode a channel count as a channel layout.
Definition: formats.h:102
void av_fifo_freep(AVFifoBuffer **f)
Free an AVFifoBuffer and reset pointer to NULL.
Definition: fifo.c:63
int width
Video only, the display dimensions of the input frames.
Definition: buffersrc.h:87
formats
Definition: signature.h:48
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:2438
Immediately push the frame to the output.
Definition: buffersrc.h:46
internal API functions
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:341
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:556
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
Add a frame to the buffer source.
Definition: buffersrc.c:150
char * channel_layout_str
Definition: buffersrc.c:65