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 "formats.h"
40 #include "internal.h"
41 #include "video.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
48 
49  /* video only */
50  int w, h;
53 #if FF_API_SWS_PARAM_OPTION
54  char *sws_param;
55 #endif
56 
58 
59  /* audio only */
62  int channels;
63  uint64_t channel_layout;
65 
66  int eof;
68 
69 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, pts)\
70  if (c->w != width || c->h != height || c->pix_fmt != format) {\
71  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",\
72  c->w, c->h, c->pix_fmt, width, height, format, av_ts2timestr(pts, &s->outputs[0]->time_base));\
73  av_log(s, AV_LOG_WARNING, "Changing video frame properties on the fly is not supported by all filters.\n");\
74  }
75 
76 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format, pts)\
77  if (c->sample_fmt != format || c->sample_rate != srate ||\
78  c->channel_layout != ch_layout || c->channels != ch_count) {\
79  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",\
80  av_get_sample_fmt_name(c->sample_fmt), c->sample_rate, c->channel_layout, c->channels,\
81  av_get_sample_fmt_name(format), srate, ch_layout, ch_count, av_ts2timestr(pts, &s->outputs[0]->time_base));\
82  av_log(s, AV_LOG_ERROR, "Changing audio frame properties on the fly is not supported.\n");\
83  return AVERROR(EINVAL);\
84  }
85 
87 {
88  AVBufferSrcParameters *par = av_mallocz(sizeof(*par));
89  if (!par)
90  return NULL;
91 
92  par->format = -1;
93 
94  return par;
95 }
96 
98 {
99  BufferSourceContext *s = ctx->priv;
100 
101  if (param->time_base.num > 0 && param->time_base.den > 0)
102  s->time_base = param->time_base;
103 
104  switch (ctx->filter->outputs[0].type) {
105  case AVMEDIA_TYPE_VIDEO:
106  if (param->format != AV_PIX_FMT_NONE) {
107  s->pix_fmt = param->format;
108  }
109  if (param->width > 0)
110  s->w = param->width;
111  if (param->height > 0)
112  s->h = param->height;
113  if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)
114  s->pixel_aspect = param->sample_aspect_ratio;
115  if (param->frame_rate.num > 0 && param->frame_rate.den > 0)
116  s->frame_rate = param->frame_rate;
117  if (param->hw_frames_ctx) {
118  av_buffer_unref(&s->hw_frames_ctx);
119  s->hw_frames_ctx = av_buffer_ref(param->hw_frames_ctx);
120  if (!s->hw_frames_ctx)
121  return AVERROR(ENOMEM);
122  }
123  break;
124  case AVMEDIA_TYPE_AUDIO:
125  if (param->format != AV_SAMPLE_FMT_NONE) {
126  s->sample_fmt = param->format;
127  }
128  if (param->sample_rate > 0)
129  s->sample_rate = param->sample_rate;
130  if (param->channel_layout)
131  s->channel_layout = param->channel_layout;
132  break;
133  default:
134  return AVERROR_BUG;
135  }
136 
137  return 0;
138 }
139 
140 int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
141 {
144 }
145 
147 {
149 }
150 
152 {
153  int ret;
154 
155  while (1) {
157  if (ret == AVERROR(EAGAIN))
158  break;
159  if (ret < 0)
160  return ret;
161  }
162  return 0;
163 }
164 
166 {
167  BufferSourceContext *s = ctx->priv;
168  AVFrame *copy;
169  int refcounted, ret;
170 
171  if (frame && frame->channel_layout &&
172  av_get_channel_layout_nb_channels(frame->channel_layout) != frame->channels) {
173  av_log(ctx, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");
174  return AVERROR(EINVAL);
175  }
176 
177  s->nb_failed_requests = 0;
178 
179  if (!frame)
181  if (s->eof)
182  return AVERROR(EINVAL);
183 
184  refcounted = !!frame->buf[0];
185 
187 
188  switch (ctx->outputs[0]->type) {
189  case AVMEDIA_TYPE_VIDEO:
190  CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
191  frame->format, frame->pts);
192  break;
193  case AVMEDIA_TYPE_AUDIO:
194  /* For layouts unknown on input but known on link after negotiation. */
195  if (!frame->channel_layout)
196  frame->channel_layout = s->channel_layout;
197  CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
198  frame->channels, frame->format, frame->pts);
199  break;
200  default:
201  return AVERROR(EINVAL);
202  }
203 
204  }
205 
206  if (!(copy = av_frame_alloc()))
207  return AVERROR(ENOMEM);
208 
209  if (refcounted && !(flags & AV_BUFFERSRC_FLAG_KEEP_REF)) {
211  } else {
213  if (ret < 0) {
215  return ret;
216  }
217  }
218 
219  ret = ff_filter_frame(ctx->outputs[0], copy);
220  if (ret < 0)
221  return ret;
222 
223  if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {
224  ret = push_frame(ctx->graph);
225  if (ret < 0)
226  return ret;
227  }
228 
229  return 0;
230 }
231 
233 {
234  BufferSourceContext *s = ctx->priv;
235 
236  s->eof = 1;
238  return (flags & AV_BUFFERSRC_FLAG_PUSH) ? push_frame(ctx->graph) : 0;
239 }
240 
242 {
243  BufferSourceContext *c = ctx->priv;
244 
245  if (c->pix_fmt == AV_PIX_FMT_NONE || !c->w || !c->h ||
246  av_q2d(c->time_base) <= 0) {
247  av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");
248  return AVERROR(EINVAL);
249  }
250 
251  av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s tb:%d/%d fr:%d/%d sar:%d/%d\n",
252  c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
253  c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
254  c->pixel_aspect.num, c->pixel_aspect.den);
255 
256 #if FF_API_SWS_PARAM_OPTION
257  if (c->sws_param)
258  av_log(ctx, AV_LOG_WARNING, "sws_param option is deprecated and ignored\n");
259 #endif
260 
261  return 0;
262 }
263 
265 {
266  return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
267 }
268 
269 #define OFFSET(x) offsetof(BufferSourceContext, x)
270 #define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
271 #define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
272 
273 static const AVOption buffer_options[] = {
274  { "width", NULL, OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
275  { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = V },
276  { "height", NULL, OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
277  { "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 },
278  { "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
279  { "pixel_aspect", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
280  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
281  { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
282 #if FF_API_SWS_PARAM_OPTION
283  { "sws_param", NULL, OFFSET(sws_param), AV_OPT_TYPE_STRING, .flags = V },
284 #endif
285  { NULL },
286 };
287 
289 
290 static const AVOption abuffer_options[] = {
291  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
292  { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
293  { "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 },
294  { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
295  { "channels", NULL, OFFSET(channels), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
296  { NULL },
297 };
298 
299 AVFILTER_DEFINE_CLASS(abuffer);
300 
302 {
303  BufferSourceContext *s = ctx->priv;
304  int ret = 0;
305 
306  if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
307  av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");
308  return AVERROR(EINVAL);
309  }
310 
311  if (s->channel_layout_str || s->channel_layout) {
312  int n;
313 
314  if (!s->channel_layout) {
315  s->channel_layout = av_get_channel_layout(s->channel_layout_str);
316  if (!s->channel_layout) {
317  av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
318  s->channel_layout_str);
319  return AVERROR(EINVAL);
320  }
321  }
322  n = av_get_channel_layout_nb_channels(s->channel_layout);
323  if (s->channels) {
324  if (n != s->channels) {
326  "Mismatching channel count %d and layout '%s' "
327  "(%d channels)\n",
328  s->channels, s->channel_layout_str, n);
329  return AVERROR(EINVAL);
330  }
331  }
332  s->channels = n;
333  } else if (!s->channels) {
334  av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
335  "channel layout specified\n");
336  return AVERROR(EINVAL);
337  }
338 
339  if (!s->time_base.num)
340  s->time_base = (AVRational){1, s->sample_rate};
341 
343  "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
344  s->time_base.num, s->time_base.den, av_get_sample_fmt_name(s->sample_fmt),
345  s->sample_rate, s->channel_layout_str);
346 
347  return ret;
348 }
349 
351 {
352  BufferSourceContext *s = ctx->priv;
353  av_buffer_unref(&s->hw_frames_ctx);
354 }
355 
357 {
358  BufferSourceContext *c = ctx->priv;
361  AVFilterFormats *samplerates = NULL;
362  int ret;
363 
364  switch (ctx->outputs[0]->type) {
365  case AVMEDIA_TYPE_VIDEO:
366  if ((ret = ff_add_format (&formats, c->pix_fmt)) < 0 ||
367  (ret = ff_set_common_formats (ctx , formats )) < 0)
368  return ret;
369  break;
370  case AVMEDIA_TYPE_AUDIO:
371  if ((ret = ff_add_format (&formats , c->sample_fmt )) < 0 ||
372  (ret = ff_set_common_formats (ctx , formats )) < 0 ||
373  (ret = ff_add_format (&samplerates, c->sample_rate)) < 0 ||
374  (ret = ff_set_common_samplerates (ctx , samplerates )) < 0)
375  return ret;
376 
378  c->channel_layout ? c->channel_layout :
379  FF_COUNT2LAYOUT(c->channels))) < 0)
380  return ret;
382  return ret;
383  break;
384  default:
385  return AVERROR(EINVAL);
386  }
387 
388  return 0;
389 }
390 
392 {
393  BufferSourceContext *c = link->src->priv;
394 
395  switch (link->type) {
396  case AVMEDIA_TYPE_VIDEO:
397  link->w = c->w;
398  link->h = c->h;
399  link->sample_aspect_ratio = c->pixel_aspect;
400 
401  if (c->hw_frames_ctx) {
402  link->hw_frames_ctx = av_buffer_ref(c->hw_frames_ctx);
403  if (!link->hw_frames_ctx)
404  return AVERROR(ENOMEM);
405  }
406  break;
407  case AVMEDIA_TYPE_AUDIO:
408  if (!c->channel_layout)
409  c->channel_layout = link->channel_layout;
410  break;
411  default:
412  return AVERROR(EINVAL);
413  }
414 
415  link->time_base = c->time_base;
416  link->frame_rate = c->frame_rate;
417  return 0;
418 }
419 
421 {
422  BufferSourceContext *c = link->src->priv;
423 
424  if (c->eof)
425  return AVERROR_EOF;
426  c->nb_failed_requests++;
427  return AVERROR(EAGAIN);
428 }
429 
431  {
432  .name = "default",
433  .type = AVMEDIA_TYPE_VIDEO,
434  .request_frame = request_frame,
435  .config_props = config_props,
436  },
437  { NULL }
438 };
439 
441  .name = "buffer",
442  .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
443  .priv_size = sizeof(BufferSourceContext),
445 
446  .init = init_video,
447  .uninit = uninit,
448 
449  .inputs = NULL,
451  .priv_class = &buffer_class,
452 };
453 
455  {
456  .name = "default",
457  .type = AVMEDIA_TYPE_AUDIO,
458  .request_frame = request_frame,
459  .config_props = config_props,
460  },
461  { NULL }
462 };
463 
465  .name = "abuffer",
466  .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
467  .priv_size = sizeof(BufferSourceContext),
469 
470  .init = init_audio,
471  .uninit = uninit,
472 
473  .inputs = NULL,
475  .priv_class = &abuffer_class,
476 };
formats
formats
Definition: signature.h:48
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
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
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:236
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
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
A
#define A
Definition: buffersrc.c:270
graph
fg outputs[0] graph
Definition: ffmpeg_filter.c:174
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:112
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
w
uint8_t w
Definition: llviddspenc.c:38
BufferSourceContext::sws_param
char * sws_param
Definition: buffersrc.c:54
AVOption
AVOption.
Definition: opt.h:247
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:146
OFFSET
#define OFFSET(x)
Definition: buffersrc.c:269
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
float.h
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:145
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:1388
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:149
BufferSourceContext::channels
int channels
Definition: buffersrc.c:62
AV_OPT_TYPE_RATIONAL
@ AV_OPT_TYPE_RATIONAL
Definition: opt.h:229
abuffer_options
static const AVOption abuffer_options[]
Definition: buffersrc.c:290
video.h
AVBufferSrcParameters::height
int height
Definition: buffersrc.h:87
sample_rate
sample_rate
Definition: ffmpeg_filter.c:156
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:64
formats.h
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: buffersrc.c:350
AVFilterContext::priv
void * priv
private data for use by the filter
Definition: avfilter.h:348
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:46
samplefmt.h
ff_vsrc_buffer
const AVFilter ff_vsrc_buffer
Definition: buffersrc.c:440
CHECK_AUDIO_PARAM_CHANGE
#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format, pts)
Definition: buffersrc.c:76
pts
static int64_t pts
Definition: transcode_aac.c:653
AVRational::num
int num
Numerator.
Definition: rational.h:59
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:54
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:99
BufferSourceContext::sample_rate
int sample_rate
Definition: buffersrc.c:60
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
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_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:580
ff_add_channel_layout
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
Definition: formats.c:331
s
#define s(width, name)
Definition: cbs_vp9.c:257
BufferSourceContext::h
int h
Definition: buffersrc.c:50
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
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:151
BufferSourceContext
Definition: buffersrc.c:43
avfilter_vsrc_buffer_outputs
static const AVFilterPad avfilter_vsrc_buffer_outputs[]
Definition: buffersrc.c:430
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
ctx
AVFormatContext * ctx
Definition: movenc.c:48
channels
channels
Definition: aptx.h:33
pix_fmt
static enum AVPixelFormat pix_fmt
Definition: demuxing_decoding.c:41
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:49
buffer_options
static const AVOption buffer_options[]
Definition: buffersrc.c:273
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
AVBufferSrcParameters::channel_layout
uint64_t channel_layout
Audio only, the audio channel layout.
Definition: buffersrc.h:116
BufferSourceContext::eof
int eof
Definition: buffersrc.c:66
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:125
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AV_OPT_TYPE_IMAGE_SIZE
@ AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:234
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:325
BufferSourceContext::nb_failed_requests
unsigned nb_failed_requests
Definition: buffersrc.c:47
AVFilterGraph
Definition: avfilter.h:798
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:52
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:226
AVBufferSrcParameters::frame_rate
AVRational frame_rate
Video only, the frame rate of the input video.
Definition: buffersrc.h:100
av_buffersrc_close
int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags)
Close the buffer source after EOF.
Definition: buffersrc.c:232
AV_BUFFERSRC_FLAG_KEEP_REF
@ AV_BUFFERSRC_FLAG_KEEP_REF
Keep a reference to the frame.
Definition: buffersrc.h:53
V
#define V
Definition: buffersrc.c:271
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:116
BufferSourceContext::channel_layout
uint64_t channel_layout
Definition: buffersrc.c:63
copy
static void copy(const float *p1, float *p2, const int length)
Definition: vf_vaguedenoiser.c:194
av_frame_ref
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:327
av_buffersrc_parameters_alloc
AVBufferSrcParameters * av_buffersrc_parameters_alloc(void)
Allocate a new AVBufferSrcParameters instance.
Definition: buffersrc.c:86
BufferSourceContext::hw_frames_ctx
AVBufferRef * hw_frames_ctx
Definition: buffersrc.c:57
config_props
static int config_props(AVFilterLink *link)
Definition: buffersrc.c:391
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:59
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
frame.h
AVBufferSrcParameters::time_base
AVRational time_base
The timebase to be used for the timestamps on the input frames.
Definition: buffersrc.h:82
request_frame
static int request_frame(AVFilterLink *link)
Definition: buffersrc.c:420
AVFrame::channel_layout
uint64_t channel_layout
Channel layout of the audio data.
Definition: frame.h:463
init_audio
static av_cold int init_audio(AVFilterContext *ctx)
Definition: buffersrc.c:301
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: buffersrc.c:356
internal.h
AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT
@ AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT
Do not check for format changes.
Definition: buffersrc.h:41
CHECK_VIDEO_PARAM_CHANGE
#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, pts)
Definition: buffersrc.c:69
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:97
BufferSourceContext::w
int w
Definition: buffersrc.c:50
BufferSourceContext::pix_fmt
enum AVPixelFormat pix_fmt
Definition: buffersrc.c:51
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:204
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:165
common.h
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
init_video
static av_cold int init_video(AVFilterContext *ctx)
Definition: buffersrc.c:241
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:461
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:243
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:60
AVFilter
Filter definition.
Definition: avfilter.h:145
ret
ret
Definition: filter_design.txt:187
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
FF_COUNT2LAYOUT
#define FF_COUNT2LAYOUT(c)
Encode a channel count as a channel layout.
Definition: formats.h:102
AVFrame::sample_aspect_ratio
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
Definition: frame.h:391
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:607
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:224
avfilter.h
AV_OPT_TYPE_PIXEL_FMT
@ AV_OPT_TYPE_PIXEL_FMT
Definition: opt.h:235
av_buffer_ref
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:93
AVFilterContext
An instance of a filter.
Definition: avfilter.h:333
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:264
audio.h
AVBufferRef
A reference to a data buffer.
Definition: buffer.h:82
BufferSourceContext::channel_layout_str
char * channel_layout_str
Definition: buffersrc.c:64
channel_layouts
static const uint16_t channel_layouts[7]
Definition: dca_lbr.c:114
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:140
imgutils.h
timestamp.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVERROR_BUG
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:50
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
ff_asrc_abuffer
const AVFilter ff_asrc_abuffer
Definition: buffersrc.c:464
ff_set_common_samplerates
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:568
h
h
Definition: vp9dsp_template.c:2038
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:228
buffersrc.h
BufferSourceContext::sample_fmt
enum AVSampleFormat sample_fmt
Definition: buffersrc.c:61
av_get_pix_fmt_name
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:2460
AV_BUFFERSRC_FLAG_PUSH
@ AV_BUFFERSRC_FLAG_PUSH
Immediately push the frame to the output.
Definition: buffersrc.h:46
avfilter_asrc_abuffer_outputs
static const AVFilterPad avfilter_asrc_abuffer_outputs[]
Definition: buffersrc.c:454
ff_set_common_channel_layouts
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:561