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/avassert.h"
30 #include "libavutil/common.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;
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 #if FF_API_SWS_PARAM_OPTION
55  char *sws_param;
56 #endif
57 
59 
60  /* audio only */
63  int channels;
64  uint64_t channel_layout;
66 
67  int eof;
69 
70 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, pts)\
71  if (c->w != width || c->h != height || c->pix_fmt != format) {\
72  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",\
73  c->w, c->h, c->pix_fmt, width, height, format, av_ts2timestr(pts, &s->outputs[0]->time_base));\
74  av_log(s, AV_LOG_WARNING, "Changing video frame properties on the fly is not supported by all filters.\n");\
75  }
76 
77 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format, pts)\
78  if (c->sample_fmt != format || c->sample_rate != srate ||\
79  c->channel_layout != ch_layout || c->channels != ch_count) {\
80  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",\
81  av_get_sample_fmt_name(c->sample_fmt), c->sample_rate, c->channel_layout, c->channels,\
82  av_get_sample_fmt_name(format), srate, ch_layout, ch_count, av_ts2timestr(pts, &s->outputs[0]->time_base));\
83  av_log(s, AV_LOG_ERROR, "Changing audio frame properties on the fly is not supported.\n");\
84  return AVERROR(EINVAL);\
85  }
86 
88 {
89  AVBufferSrcParameters *par = av_mallocz(sizeof(*par));
90  if (!par)
91  return NULL;
92 
93  par->format = -1;
94 
95  return par;
96 }
97 
99 {
100  BufferSourceContext *s = ctx->priv;
101 
102  if (param->time_base.num > 0 && param->time_base.den > 0)
103  s->time_base = param->time_base;
104 
105  switch (ctx->filter->outputs[0].type) {
106  case AVMEDIA_TYPE_VIDEO:
107  if (param->format != AV_PIX_FMT_NONE) {
108  s->pix_fmt = param->format;
109  }
110  if (param->width > 0)
111  s->w = param->width;
112  if (param->height > 0)
113  s->h = param->height;
114  if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)
115  s->pixel_aspect = param->sample_aspect_ratio;
116  if (param->frame_rate.num > 0 && param->frame_rate.den > 0)
117  s->frame_rate = param->frame_rate;
118  if (param->hw_frames_ctx) {
121  if (!s->hw_frames_ctx)
122  return AVERROR(ENOMEM);
123  }
124  break;
125  case AVMEDIA_TYPE_AUDIO:
126  if (param->format != AV_SAMPLE_FMT_NONE) {
127  s->sample_fmt = param->format;
128  }
129  if (param->sample_rate > 0)
130  s->sample_rate = param->sample_rate;
131  if (param->channel_layout)
132  s->channel_layout = param->channel_layout;
133  break;
134  default:
135  return AVERROR_BUG;
136  }
137 
138  return 0;
139 }
140 
141 int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
142 {
143  return av_buffersrc_add_frame_flags(ctx, (AVFrame *)frame,
145 }
146 
148 {
149  return av_buffersrc_add_frame_flags(ctx, frame, 0);
150 }
151 
152 static int push_frame(AVFilterGraph *graph)
153 {
154  int ret;
155 
156  while (1) {
157  ret = ff_filter_graph_run_once(graph);
158  if (ret == AVERROR(EAGAIN))
159  break;
160  if (ret < 0)
161  return ret;
162  }
163  return 0;
164 }
165 
167 {
168  BufferSourceContext *s = ctx->priv;
169  AVFrame *copy;
170  int refcounted, ret;
171 
172  if (frame && frame->channel_layout &&
174  av_log(ctx, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");
175  return AVERROR(EINVAL);
176  }
177 
178  s->nb_failed_requests = 0;
179 
180  if (!frame)
181  return av_buffersrc_close(ctx, AV_NOPTS_VALUE, flags);
182  if (s->eof)
183  return AVERROR(EINVAL);
184 
185  refcounted = !!frame->buf[0];
186 
187  if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
188 
189  switch (ctx->outputs[0]->type) {
190  case AVMEDIA_TYPE_VIDEO:
191  CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
192  frame->format, frame->pts);
193  break;
194  case AVMEDIA_TYPE_AUDIO:
195  /* For layouts unknown on input but known on link after negotiation. */
196  if (!frame->channel_layout)
197  frame->channel_layout = s->channel_layout;
198  CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
199  frame->channels, frame->format, frame->pts);
200  break;
201  default:
202  return AVERROR(EINVAL);
203  }
204 
205  }
206 
207  if (!(copy = av_frame_alloc()))
208  return AVERROR(ENOMEM);
209 
210  if (refcounted && !(flags & AV_BUFFERSRC_FLAG_KEEP_REF)) {
211  av_frame_move_ref(copy, frame);
212  } else {
213  ret = av_frame_ref(copy, frame);
214  if (ret < 0) {
215  av_frame_free(&copy);
216  return ret;
217  }
218  }
219 
220  ret = ff_filter_frame(ctx->outputs[0], copy);
221  if (ret < 0)
222  return ret;
223 
224  if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {
225  ret = push_frame(ctx->graph);
226  if (ret < 0)
227  return ret;
228  }
229 
230  return 0;
231 }
232 
234 {
235  BufferSourceContext *s = ctx->priv;
236 
237  s->eof = 1;
239  return (flags & AV_BUFFERSRC_FLAG_PUSH) ? push_frame(ctx->graph) : 0;
240 }
241 
243 {
244  BufferSourceContext *c = ctx->priv;
245 
246  if (c->pix_fmt == AV_PIX_FMT_NONE || !c->w || !c->h ||
247  av_q2d(c->time_base) <= 0) {
248  av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");
249  return AVERROR(EINVAL);
250  }
251 
252  av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s tb:%d/%d fr:%d/%d sar:%d/%d\n",
253  c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
256 
257 #if FF_API_SWS_PARAM_OPTION
258  if (c->sws_param)
259  av_log(ctx, AV_LOG_WARNING, "sws_param option is deprecated and ignored\n");
260 #endif
261 
262  return 0;
263 }
264 
266 {
267  return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
268 }
269 
270 #define OFFSET(x) offsetof(BufferSourceContext, x)
271 #define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
272 #define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
273 
274 static const AVOption buffer_options[] = {
275  { "width", NULL, OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
276  { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = V },
277  { "height", NULL, OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
278  { "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 },
279  { "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
280  { "pixel_aspect", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
281  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
282  { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
283 #if FF_API_SWS_PARAM_OPTION
284  { "sws_param", NULL, OFFSET(sws_param), AV_OPT_TYPE_STRING, .flags = V },
285 #endif
286  { NULL },
287 };
288 
290 
291 static const AVOption abuffer_options[] = {
292  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
293  { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
294  { "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 },
295  { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
296  { "channels", NULL, OFFSET(channels), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
297  { NULL },
298 };
299 
300 AVFILTER_DEFINE_CLASS(abuffer);
301 
303 {
304  BufferSourceContext *s = ctx->priv;
305  int ret = 0;
306 
307  if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
308  av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");
309  return AVERROR(EINVAL);
310  }
311 
312  if (s->channel_layout_str || s->channel_layout) {
313  int n;
314 
315  if (!s->channel_layout) {
317  if (!s->channel_layout) {
318  av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
319  s->channel_layout_str);
320  return AVERROR(EINVAL);
321  }
322  }
324  if (s->channels) {
325  if (n != s->channels) {
326  av_log(ctx, AV_LOG_ERROR,
327  "Mismatching channel count %d and layout '%s' "
328  "(%d channels)\n",
329  s->channels, s->channel_layout_str, n);
330  return AVERROR(EINVAL);
331  }
332  }
333  s->channels = n;
334  } else if (!s->channels) {
335  av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
336  "channel layout specified\n");
337  return AVERROR(EINVAL);
338  }
339 
340  if (!s->time_base.num)
341  s->time_base = (AVRational){1, s->sample_rate};
342 
343  av_log(ctx, AV_LOG_VERBOSE,
344  "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
347 
348  return ret;
349 }
350 
352 {
353  BufferSourceContext *s = ctx->priv;
355 }
356 
358 {
359  BufferSourceContext *c = ctx->priv;
362  AVFilterFormats *samplerates = NULL;
363  int ret;
364 
365  switch (ctx->outputs[0]->type) {
366  case AVMEDIA_TYPE_VIDEO:
367  if ((ret = ff_add_format (&formats, c->pix_fmt)) < 0 ||
368  (ret = ff_set_common_formats (ctx , formats )) < 0)
369  return ret;
370  break;
371  case AVMEDIA_TYPE_AUDIO:
372  if ((ret = ff_add_format (&formats , c->sample_fmt )) < 0 ||
373  (ret = ff_set_common_formats (ctx , formats )) < 0 ||
374  (ret = ff_add_format (&samplerates, c->sample_rate)) < 0 ||
375  (ret = ff_set_common_samplerates (ctx , samplerates )) < 0)
376  return ret;
377 
378  if ((ret = ff_add_channel_layout(&channel_layouts,
380  FF_COUNT2LAYOUT(c->channels))) < 0)
381  return ret;
382  if ((ret = ff_set_common_channel_layouts(ctx, channel_layouts)) < 0)
383  return ret;
384  break;
385  default:
386  return AVERROR(EINVAL);
387  }
388 
389  return 0;
390 }
391 
393 {
394  BufferSourceContext *c = link->src->priv;
395 
396  switch (link->type) {
397  case AVMEDIA_TYPE_VIDEO:
398  link->w = c->w;
399  link->h = c->h;
401 
402  if (c->hw_frames_ctx) {
404  if (!link->hw_frames_ctx)
405  return AVERROR(ENOMEM);
406  }
407  break;
408  case AVMEDIA_TYPE_AUDIO:
409  if (!c->channel_layout)
410  c->channel_layout = link->channel_layout;
411  break;
412  default:
413  return AVERROR(EINVAL);
414  }
415 
416  link->time_base = c->time_base;
417  link->frame_rate = c->frame_rate;
418  return 0;
419 }
420 
422 {
423  BufferSourceContext *c = link->src->priv;
424 
425  if (c->eof)
426  return AVERROR_EOF;
427  c->nb_failed_requests++;
428  return AVERROR(EAGAIN);
429 }
430 
432  {
433  .name = "default",
434  .type = AVMEDIA_TYPE_VIDEO,
435  .request_frame = request_frame,
436  .config_props = config_props,
437  },
438  { NULL }
439 };
440 
442  .name = "buffer",
443  .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
444  .priv_size = sizeof(BufferSourceContext),
446 
447  .init = init_video,
448  .uninit = uninit,
449 
450  .inputs = NULL,
451  .outputs = avfilter_vsrc_buffer_outputs,
452  .priv_class = &buffer_class,
453 };
454 
456  {
457  .name = "default",
458  .type = AVMEDIA_TYPE_AUDIO,
459  .request_frame = request_frame,
460  .config_props = config_props,
461  },
462  { NULL }
463 };
464 
466  .name = "abuffer",
467  .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
468  .priv_size = sizeof(BufferSourceContext),
470 
471  .init = init_audio,
472  .uninit = uninit,
473 
474  .inputs = NULL,
475  .outputs = avfilter_asrc_abuffer_outputs,
476  .priv_class = &abuffer_class,
477 };
#define NULL
Definition: coverity.c:32
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
This structure describes decoded (raw) audio or video data.
Definition: frame.h:314
#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format, pts)
Definition: buffersrc.c:77
AVOption.
Definition: opt.h:248
AVRational pixel_aspect
Definition: buffersrc.c:53
misc image utilities
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
Main libavfilter public API header.
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:505
Memory buffer source API.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
int num
Numerator.
Definition: rational.h:59
Do not check for format changes.
Definition: buffersrc.h:41
static av_cold int init_video(AVFilterContext *ctx)
Definition: buffersrc.c:242
static const AVFilterPad avfilter_vsrc_buffer_outputs[]
Definition: buffersrc.c:431
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:65
int ff_set_common_channel_layouts(AVFilterContext *ctx, AVFilterChannelLayouts *channel_layouts)
A helper for query_formats() which sets all links to the same list of channel layouts/sample rates...
Definition: formats.c:569
void av_frame_move_ref(AVFrame *dst, AVFrame *src)
Move everything contained in src to dst and reset src.
Definition: frame.c:582
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
enum AVPixelFormat pix_fmt
Definition: buffersrc.c:52
static av_cold void uninit(AVFilterContext *ctx)
Definition: buffersrc.c:351
AVRational frame_rate
Video only, the frame rate of the input video.
Definition: buffersrc.h:100
#define OFFSET(x)
Definition: buffersrc.c:270
AVFilter ff_asrc_abuffer
Definition: buffersrc.c:465
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
struct AVFilterGraph * graph
filtergraph this filter belongs to
Definition: avfilter.h:358
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:291
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1093
#define av_cold
Definition: attributes.h:88
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
AVOptions.
timestamp utils, mostly useful for debugging/logging purposes
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
AVRational time_base
The timebase to be used for the timestamps on the input frames.
Definition: buffersrc.h:82
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:407
#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, pts)
Definition: buffersrc.c:70
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:210
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:455
channels
Definition: aptx.h:33
#define av_log(a,...)
A filter pad used for either input or output.
Definition: internal.h:54
int width
Definition: frame.h:372
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
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:588
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
Definition: formats.c:339
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:203
static int request_frame(AVFilterLink *link)
Definition: buffersrc.c:421
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:115
void * priv
private data for use by the filter
Definition: avfilter.h:356
int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags)
Close the buffer source after EOF.
Definition: buffersrc.c:233
#define A
Definition: buffersrc.c:271
simple assert() macros that are a bit more flexible than ISO C assert().
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:333
AVRational time_base
time_base to set in the output link
Definition: buffersrc.c:46
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:47
reference-counted frame API
uint64_t channel_layout
Channel layout of the audio data.
Definition: frame.h:491
common internal API header
AVFILTER_DEFINE_CLASS(buffer)
int channels
number of audio channels, only used for audio.
Definition: frame.h:620
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
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
#define s(width, name)
Definition: cbs_vp9.c:257
static av_cold int init_audio(AVFilterContext *ctx)
Definition: buffersrc.c:302
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
A list of supported channel layouts.
Definition: formats.h:86
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:387
AVBufferRef * hw_frames_ctx
Video with a hwaccel pixel format only.
Definition: buffersrc.h:106
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
static const AVOption buffer_options[]
Definition: buffersrc.c:274
#define V
Definition: buffersrc.c:272
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
Immediately push the frame to the output.
Definition: buffersrc.h:46
static int push_frame(AVFilterGraph *graph)
Definition: buffersrc.c:152
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:50
static const uint16_t channel_layouts[7]
Definition: dca_lbr.c:114
Describe the class of an AVClass context structure.
Definition: log.h:67
int sample_rate
Sample rate of the audio data.
Definition: frame.h:486
Filter definition.
Definition: avfilter.h:145
Rational number (pair of numerator and denominator).
Definition: rational.h:58
static int config_props(AVFilterLink *link)
Definition: buffersrc.c:392
const char * name
Filter name.
Definition: avfilter.h:149
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
offset must point to two consecutive integers
Definition: opt.h:235
unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
Get the number of failed requests.
Definition: buffersrc.c:265
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:353
uint64_t channel_layout
Definition: buffersrc.c:64
Keep a reference to the frame.
Definition: buffersrc.h:53
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:141
AVFilter ff_vsrc_buffer
Definition: buffersrc.c:441
A reference to a data buffer.
Definition: buffer.h:81
common internal and external API header
int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param)
Initialize the buffersrc or abuffersrc filter with the provided parameters.
Definition: buffersrc.c:98
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:166
unsigned nb_failed_requests
Definition: buffersrc.c:48
enum AVSampleFormat sample_fmt
Definition: buffersrc.c:62
static int query_formats(AVFilterContext *ctx)
Definition: buffersrc.c:357
A list of supported formats for one end of a filter link.
Definition: formats.h:65
AVBufferSrcParameters * av_buffersrc_parameters_alloc(void)
Allocate a new AVBufferSrcParameters instance.
Definition: buffersrc.c:87
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
An instance of a filter.
Definition: avfilter.h:341
int height
Definition: frame.h:372
const AVFilterPad * outputs
List of outputs, terminated by a zeroed element.
Definition: avfilter.h:173
#define FF_COUNT2LAYOUT(c)
Encode a channel count as a channel layout.
Definition: formats.h:103
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:2489
internal API functions
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
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:344
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:576
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
GLuint buffer
Definition: opengl_enc.c:101
int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
Add a frame to the buffer source.
Definition: buffersrc.c:147
char * channel_layout_str
Definition: buffersrc.c:65