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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 "audio.h"
37 #include "avfilter.h"
38 #include "buffersrc.h"
39 #include "formats.h"
40 #include "internal.h"
41 #include "video.h"
42 #include "avcodec.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 
58  /* audio only */
61  int channels;
62  uint64_t channel_layout;
64 
65  int eof;
67 
68 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
69  if (c->w != width || c->h != height || c->pix_fmt != format) {\
70  av_log(s, AV_LOG_INFO, "Changing frame properties on the fly is not supported by all filters.\n");\
71  }
72 
73 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format)\
74  if (c->sample_fmt != format || c->sample_rate != srate ||\
75  c->channel_layout != ch_layout || c->channels != ch_count) {\
76  av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
77  return AVERROR(EINVAL);\
78  }
79 
80 int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
81 {
82  return av_buffersrc_add_frame_flags(ctx, (AVFrame *)frame,
84 }
85 
86 int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
87 {
88  return av_buffersrc_add_frame_flags(ctx, frame, 0);
89 }
90 
92  AVFrame *frame, int flags);
93 
94 int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
95 {
96  AVFrame *copy = NULL;
97  int ret = 0;
98 
99  if (frame && frame->channel_layout &&
101  av_log(ctx, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");
102  return AVERROR(EINVAL);
103  }
104 
105  if (!(flags & AV_BUFFERSRC_FLAG_KEEP_REF) || !frame)
106  return av_buffersrc_add_frame_internal(ctx, frame, flags);
107 
108  if (!(copy = av_frame_alloc()))
109  return AVERROR(ENOMEM);
110  ret = av_frame_ref(copy, frame);
111  if (ret >= 0)
112  ret = av_buffersrc_add_frame_internal(ctx, copy, flags);
113 
114  av_frame_free(&copy);
115  return ret;
116 }
117 
119  AVFrame *frame, int flags)
120 {
121  BufferSourceContext *s = ctx->priv;
122  AVFrame *copy;
123  int refcounted, ret;
124 
125  s->nb_failed_requests = 0;
126 
127  if (!frame) {
128  s->eof = 1;
129  return 0;
130  } else if (s->eof)
131  return AVERROR(EINVAL);
132 
133  refcounted = !!frame->buf[0];
134 
135  if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
136 
137  switch (ctx->outputs[0]->type) {
138  case AVMEDIA_TYPE_VIDEO:
139  CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
140  frame->format);
141  break;
142  case AVMEDIA_TYPE_AUDIO:
143  /* For layouts unknown on input but known on link after negotiation. */
144  if (!frame->channel_layout)
145  frame->channel_layout = s->channel_layout;
146  CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
147  av_frame_get_channels(frame), frame->format);
148  break;
149  default:
150  return AVERROR(EINVAL);
151  }
152 
153  }
154 
155  if (!av_fifo_space(s->fifo) &&
156  (ret = av_fifo_realloc2(s->fifo, av_fifo_size(s->fifo) +
157  sizeof(copy))) < 0)
158  return ret;
159 
160  if (!(copy = av_frame_alloc()))
161  return AVERROR(ENOMEM);
162 
163  if (refcounted) {
164  av_frame_move_ref(copy, frame);
165  } else {
166  ret = av_frame_ref(copy, frame);
167  if (ret < 0) {
168  av_frame_free(&copy);
169  return ret;
170  }
171  }
172 
173  if ((ret = av_fifo_generic_write(s->fifo, &copy, sizeof(copy), NULL)) < 0) {
174  if (refcounted)
175  av_frame_move_ref(frame, copy);
176  av_frame_free(&copy);
177  return ret;
178  }
179 
180  if ((flags & AV_BUFFERSRC_FLAG_PUSH))
181  if ((ret = ctx->output_pads[0].request_frame(ctx->outputs[0])) < 0)
182  return ret;
183 
184  return 0;
185 }
186 
187 #if FF_API_AVFILTERBUFFER
189 static void compat_free_buffer(void *opaque, uint8_t *data)
190 {
191  AVFilterBufferRef *buf = opaque;
193  avfilter_unref_buffer(buf);
194  )
195 }
196 
197 static void compat_unref_buffer(void *opaque, uint8_t *data)
198 {
199  AVBufferRef *buf = opaque;
201  av_buffer_unref(&buf);
202  )
203 }
204 
205 int av_buffersrc_add_ref(AVFilterContext *ctx, AVFilterBufferRef *buf,
206  int flags)
207 {
208  BufferSourceContext *s = ctx->priv;
209  AVFrame *frame = NULL;
210  AVBufferRef *dummy_buf = NULL;
211  int ret = 0, planes, i;
212 
213  if (!buf) {
214  s->eof = 1;
215  return 0;
216  } else if (s->eof)
217  return AVERROR(EINVAL);
218 
219  frame = av_frame_alloc();
220  if (!frame)
221  return AVERROR(ENOMEM);
222 
223  dummy_buf = av_buffer_create(NULL, 0, compat_free_buffer, buf,
224  (buf->perms & AV_PERM_WRITE) ? 0 : AV_BUFFER_FLAG_READONLY);
225  if (!dummy_buf) {
226  ret = AVERROR(ENOMEM);
227  goto fail;
228  }
229 
231  if ((ret = avfilter_copy_buf_props(frame, buf)) < 0)
232  goto fail;
233  )
234 
235 #define WRAP_PLANE(ref_out, data, data_size) \
236 do { \
237  AVBufferRef *dummy_ref = av_buffer_ref(dummy_buf); \
238  if (!dummy_ref) { \
239  ret = AVERROR(ENOMEM); \
240  goto fail; \
241  } \
242  ref_out = av_buffer_create(data, data_size, compat_unref_buffer, \
243  dummy_ref, (buf->perms & AV_PERM_WRITE) ? 0 : AV_BUFFER_FLAG_READONLY); \
244  if (!ref_out) { \
245  av_buffer_unref(&dummy_ref); \
246  av_frame_unref(frame); \
247  ret = AVERROR(ENOMEM); \
248  goto fail; \
249  } \
250 } while (0)
251 
252  if (ctx->outputs[0]->type == AVMEDIA_TYPE_VIDEO) {
253  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
254 
255  planes = av_pix_fmt_count_planes(frame->format);
256  if (!desc || planes <= 0) {
257  ret = AVERROR(EINVAL);
258  goto fail;
259  }
260 
261  for (i = 0; i < planes; i++) {
262  int v_shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
263  int plane_size = (frame->height >> v_shift) * frame->linesize[i];
264 
265  WRAP_PLANE(frame->buf[i], frame->data[i], plane_size);
266  }
267  } else {
268  int planar = av_sample_fmt_is_planar(frame->format);
269  int channels = av_get_channel_layout_nb_channels(frame->channel_layout);
270 
271  planes = planar ? channels : 1;
272 
273  if (planes > FF_ARRAY_ELEMS(frame->buf)) {
274  frame->nb_extended_buf = planes - FF_ARRAY_ELEMS(frame->buf);
275  frame->extended_buf = av_mallocz_array(sizeof(*frame->extended_buf),
276  frame->nb_extended_buf);
277  if (!frame->extended_buf) {
278  ret = AVERROR(ENOMEM);
279  goto fail;
280  }
281  }
282 
283  for (i = 0; i < FFMIN(planes, FF_ARRAY_ELEMS(frame->buf)); i++)
284  WRAP_PLANE(frame->buf[i], frame->extended_data[i], frame->linesize[0]);
285 
286  for (i = 0; i < planes - FF_ARRAY_ELEMS(frame->buf); i++)
287  WRAP_PLANE(frame->extended_buf[i],
288  frame->extended_data[i + FF_ARRAY_ELEMS(frame->buf)],
289  frame->linesize[0]);
290  }
291 
292  ret = av_buffersrc_add_frame_flags(ctx, frame, flags);
293 
294 fail:
295  av_buffer_unref(&dummy_buf);
296  av_frame_free(&frame);
297 
298  return ret;
299 }
301 
302 int av_buffersrc_buffer(AVFilterContext *ctx, AVFilterBufferRef *buf)
303 {
304  return av_buffersrc_add_ref(ctx, buf, 0);
305 }
306 #endif
307 
309 {
310  BufferSourceContext *c = ctx->priv;
311 
312  if (c->pix_fmt == AV_PIX_FMT_NONE || !c->w || !c->h || av_q2d(c->time_base) <= 0) {
313  av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");
314  return AVERROR(EINVAL);
315  }
316 
317  if (!(c->fifo = av_fifo_alloc(sizeof(AVFrame*))))
318  return AVERROR(ENOMEM);
319 
320  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",
321  c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
323  c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));
324  c->warning_limit = 100;
325  return 0;
326 }
327 
329 {
330  return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
331 }
332 
333 #define OFFSET(x) offsetof(BufferSourceContext, x)
334 #define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
335 #define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
336 
337 static const AVOption buffer_options[] = {
338  { "width", NULL, OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
339  { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = V },
340  { "height", NULL, OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
341  { "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 },
342 #if FF_API_OLD_FILTER_OPTS
343  /* those 4 are for compatibility with the old option passing system where each filter
344  * did its own parsing */
345  { "time_base_num", "deprecated, do not use", OFFSET(time_base.num), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
346  { "time_base_den", "deprecated, do not use", OFFSET(time_base.den), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
347  { "sar_num", "deprecated, do not use", OFFSET(pixel_aspect.num), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
348  { "sar_den", "deprecated, do not use", OFFSET(pixel_aspect.den), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
349 #endif
350  { "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 1 }, 0, DBL_MAX, V },
351  { "pixel_aspect", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 1 }, 0, DBL_MAX, V },
352  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
353  { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
354  { "sws_param", NULL, OFFSET(sws_param), AV_OPT_TYPE_STRING, .flags = V },
355  { NULL },
356 };
357 
359 
360 static const AVOption abuffer_options[] = {
361  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
362  { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
363  { "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 },
364  { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
365  { "channels", NULL, OFFSET(channels), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
366  { NULL },
367 };
368 
369 AVFILTER_DEFINE_CLASS(abuffer);
370 
372 {
373  BufferSourceContext *s = ctx->priv;
374  int ret = 0;
375 
376  if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
377  av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");
378  return AVERROR(EINVAL);
379  }
380 
381  if (s->channel_layout_str) {
382  int n;
383 
385  if (!s->channel_layout) {
386  av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
387  s->channel_layout_str);
388  return AVERROR(EINVAL);
389  }
391  if (s->channels) {
392  if (n != s->channels) {
393  av_log(ctx, AV_LOG_ERROR,
394  "Mismatching channel count %d and layout '%s' "
395  "(%d channels)\n",
396  s->channels, s->channel_layout_str, n);
397  return AVERROR(EINVAL);
398  }
399  }
400  s->channels = n;
401  } else if (!s->channels) {
402  av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
403  "channel layout specified\n");
404  return AVERROR(EINVAL);
405  }
406 
407  if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*))))
408  return AVERROR(ENOMEM);
409 
410  if (!s->time_base.num)
411  s->time_base = (AVRational){1, s->sample_rate};
412 
413  av_log(ctx, AV_LOG_VERBOSE,
414  "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
417  s->warning_limit = 100;
418 
419  return ret;
420 }
421 
422 static av_cold void uninit(AVFilterContext *ctx)
423 {
424  BufferSourceContext *s = ctx->priv;
425  while (s->fifo && av_fifo_size(s->fifo)) {
426  AVFrame *frame;
427  av_fifo_generic_read(s->fifo, &frame, sizeof(frame), NULL);
428  av_frame_free(&frame);
429  }
430  av_fifo_freep(&s->fifo);
431 }
432 
434 {
435  BufferSourceContext *c = ctx->priv;
436  AVFilterChannelLayouts *channel_layouts = NULL;
438  AVFilterFormats *samplerates = NULL;
439 
440  switch (ctx->outputs[0]->type) {
441  case AVMEDIA_TYPE_VIDEO:
442  ff_add_format(&formats, c->pix_fmt);
443  ff_set_common_formats(ctx, formats);
444  break;
445  case AVMEDIA_TYPE_AUDIO:
446  ff_add_format(&formats, c->sample_fmt);
447  ff_set_common_formats(ctx, formats);
448 
449  ff_add_format(&samplerates, c->sample_rate);
450  ff_set_common_samplerates(ctx, samplerates);
451 
452  ff_add_channel_layout(&channel_layouts,
455  ff_set_common_channel_layouts(ctx, channel_layouts);
456  break;
457  default:
458  return AVERROR(EINVAL);
459  }
460 
461  return 0;
462 }
463 
464 static int config_props(AVFilterLink *link)
465 {
466  BufferSourceContext *c = link->src->priv;
467 
468  switch (link->type) {
469  case AVMEDIA_TYPE_VIDEO:
470  link->w = c->w;
471  link->h = c->h;
473  break;
474  case AVMEDIA_TYPE_AUDIO:
475  if (!c->channel_layout)
476  c->channel_layout = link->channel_layout;
477  break;
478  default:
479  return AVERROR(EINVAL);
480  }
481 
482  link->time_base = c->time_base;
483  link->frame_rate = c->frame_rate;
484  return 0;
485 }
486 
487 static int request_frame(AVFilterLink *link)
488 {
489  BufferSourceContext *c = link->src->priv;
490  AVFrame *frame;
491 
492  if (!av_fifo_size(c->fifo)) {
493  if (c->eof)
494  return AVERROR_EOF;
495  c->nb_failed_requests++;
496  return AVERROR(EAGAIN);
497  }
498  av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);
499 
500  return ff_filter_frame(link, frame);
501 }
502 
503 static int poll_frame(AVFilterLink *link)
504 {
505  BufferSourceContext *c = link->src->priv;
506  int size = av_fifo_size(c->fifo);
507  if (!size && c->eof)
508  return AVERROR_EOF;
509  return size/sizeof(AVFrame*);
510 }
511 
513  {
514  .name = "default",
515  .type = AVMEDIA_TYPE_VIDEO,
516  .request_frame = request_frame,
517  .poll_frame = poll_frame,
518  .config_props = config_props,
519  },
520  { NULL }
521 };
522 
524  .name = "buffer",
525  .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
526  .priv_size = sizeof(BufferSourceContext),
528 
529  .init = init_video,
530  .uninit = uninit,
531 
532  .inputs = NULL,
533  .outputs = avfilter_vsrc_buffer_outputs,
534  .priv_class = &buffer_class,
535 };
536 
538  {
539  .name = "default",
540  .type = AVMEDIA_TYPE_AUDIO,
541  .request_frame = request_frame,
542  .poll_frame = poll_frame,
543  .config_props = config_props,
544  },
545  { NULL }
546 };
547 
549  .name = "abuffer",
550  .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
551  .priv_size = sizeof(BufferSourceContext),
553 
554  .init = init_audio,
555  .uninit = uninit,
556 
557  .inputs = NULL,
558  .outputs = avfilter_asrc_abuffer_outputs,
559  .priv_class = &abuffer_class,
560 };
#define WRAP_PLANE(ref_out, data, data_size)
#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:523
const char * s
Definition: avisynth_c.h:631
static enum AVPixelFormat pix_fmt
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:124
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2129
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
AVOption.
Definition: opt.h:255
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
AVRational pixel_aspect
Definition: buffersrc.c:55
misc image utilities
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:248
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2169
#define AV_NOWARN_DEPRECATED(code)
Disable warnings about deprecated features This is useful for sections of code kept for backward comp...
Definition: attributes.h:100
Main libavfilter public API header.
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:441
Memory buffer source API.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int nb_extended_buf
Number of elements in extended_buf.
Definition: frame.h:459
int num
numerator
Definition: rational.h:44
static av_cold int init_video(AVFilterContext *ctx)
Definition: buffersrc.c:308
static const AVFilterPad avfilter_vsrc_buffer_outputs[]
Definition: buffersrc.c:512
void av_frame_move_ref(AVFrame *dst, AVFrame *src)
Move everything contained in src to dst and reset src.
Definition: frame.c:484
static enum AVSampleFormat formats[]
enum AVPixelFormat pix_fmt
Definition: buffersrc.c:54
static av_cold void uninit(AVFilterContext *ctx)
Definition: buffersrc.c:422
#define OFFSET(x)
Definition: buffersrc.c:333
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:548
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
Do not check for format changes.
Definition: buffersrc.h:43
const char * name
Pad name.
Definition: internal.h:69
uint64_t av_get_channel_layout(const char *name)
Return a channel layout id that matches name, or 0 if no match is found.
static const AVOption abuffer_options[]
Definition: buffersrc.c:360
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:1158
AVFilterPad * output_pads
array of output pads
Definition: avfilter.h:647
uint8_t
#define av_cold
Definition: attributes.h:74
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:135
int(* request_frame)(AVFilterLink *link)
Frame request callback.
Definition: internal.h:122
AVOptions.
libavcodec/libavfilter gluing utilities
static int poll_frame(AVFilterLink *link)
Definition: buffersrc.c:503
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:365
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
Keep a reference to the frame.
Definition: buffersrc.h:62
static AVFrame * frame
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:94
static double av_q2d(AVRational a)
Convert rational to double.
Definition: rational.h:80
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
static const AVFilterPad avfilter_asrc_abuffer_outputs[]
Definition: buffersrc.c:537
#define AV_BUFFER_FLAG_READONLY
Always treat the buffer as read-only, even when it has only one reference.
Definition: buffer.h:113
static void copy(LZOContext *c, int cnt)
Copies bytes from input to output buffer with checking.
Definition: lzo.c:85
ptrdiff_t size
Definition: opengl_enc.c:101
#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format)
Definition: buffersrc.c:73
#define av_log(a,...)
int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
Check if the sample format is planar.
Definition: samplefmt.c:110
A filter pad used for either input or output.
Definition: internal.h:63
static void * av_x_if_null(const void *p, const void *x)
Return x default pointer in case p is NULL.
Definition: avutil.h:300
int width
width and height of the video frame
Definition: frame.h:220
#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:542
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:89
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
Definition: formats.c:329
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:148
static int request_frame(AVFilterLink *link)
Definition: buffersrc.c:487
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
void * priv
private data for use by the filter
Definition: avfilter.h:654
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:177
#define A
Definition: buffersrc.c:334
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:323
AVRational time_base
time_base to set in the output link
Definition: buffersrc.c:47
AVBufferRef * av_buffer_create(uint8_t *data, int size, void(*free)(void *opaque, uint8_t *data), void *opaque, int flags)
Create an AVBuffer from an existing array.
Definition: buffer.c:28
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:47
AVRational frame_rate
frame_rate to set in the output link
Definition: buffersrc.c:48
#define fail()
Definition: checkasm.h:57
reference-counted frame API
uint64_t channel_layout
Channel layout of the audio data.
Definition: frame.h:427
common internal API header
AVFILTER_DEFINE_CLASS(buffer)
audio channel layout utility functions
#define FFMIN(a, b)
Definition: common.h:81
AVBufferRef ** extended_buf
For planar audio which requires more than AV_NUM_DATA_POINTERS AVBufferRef pointers, this array will hold all the references which cannot fit into AVFrame.buf.
Definition: frame.h:455
int n
Definition: avisynth_c.h:547
static av_cold int init_audio(AVFilterContext *ctx)
Definition: buffersrc.c:371
#define FF_ARRAY_ELEMS(a)
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:232
sample_rate
int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
Add a frame to the buffer source.
Definition: buffersrc.c:80
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:59
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:337
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:199
int av_fifo_realloc2(AVFifoBuffer *f, unsigned int new_size)
Resize an AVFifoBuffer.
Definition: fifo.c:87
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
a very simple circular buffer FIFO implementation
void * buf
Definition: avisynth_c.h:553
#define V
Definition: buffersrc.c:335
Describe the class of an AVClass context structure.
Definition: log.h:67
int sample_rate
Sample rate of the audio data.
Definition: frame.h:422
int av_frame_get_channels(const AVFrame *frame)
Filter definition.
Definition: avfilter.h:470
static const AVFilterPad inputs[]
Definition: af_ashowinfo.c:239
rational number numerator/denominator
Definition: rational.h:43
static int config_props(AVFilterLink *link)
Definition: buffersrc.c:464
const char * name
Filter name.
Definition: avfilter.h:474
static int av_buffersrc_add_frame_internal(AVFilterContext *ctx, AVFrame *frame, int flags)
Definition: buffersrc.c:118
offset must point to two consecutive integers
Definition: opt.h:232
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:328
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:648
int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
Add a frame to the buffer source.
Definition: buffersrc.c:86
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:464
uint64_t channel_layout
Definition: buffersrc.c:62
static int flags
Definition: cpu.c:47
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:182
AVFilter ff_vsrc_buffer
Definition: buffersrc.c:523
A reference to a data buffer.
Definition: buffer.h:81
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:79
common internal and external API header
if(ret< 0)
Definition: vf_mcdeint.c:280
static double c[64]
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:92
int den
denominator
Definition: rational.h:45
unsigned nb_failed_requests
Definition: buffersrc.c:49
AVFifoBuffer * av_fifo_alloc(unsigned int size)
Initialize an AVFifoBuffer.
Definition: fifo.c:43
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:80
enum AVSampleFormat sample_fmt
Definition: buffersrc.c:60
static int query_formats(AVFilterContext *ctx)
Definition: buffersrc.c:433
Immediately push the frame to the output.
Definition: buffersrc.h:55
A list of supported formats for one end of a filter link.
Definition: formats.h:64
An instance of a filter.
Definition: avfilter.h:633
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:228
int height
Definition: frame.h:220
#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
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:2050
internal API functions
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:215
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:530
#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)
Definition: buffersrc.c:68
static void compat_free_buffer(void *opaque, uint8_t *data)
Definition: utils.c:859
GLuint buffer
Definition: opengl_enc.c:102
char * channel_layout_str
Definition: buffersrc.c:63