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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 
43 typedef struct BufferSourceContext {
44  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  unsigned warning_limit;
50 
51  /* video only */
52  int w, h;
55  char *sws_param;
56 
58 
59  /* audio only */
62  int channels;
63  uint64_t channel_layout;
65 
67  int eof;
69 
70 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
71  if (c->w != width || c->h != height || c->pix_fmt != format) {\
72  av_log(s, AV_LOG_INFO, "Changing frame properties on the fly is not supported by all filters.\n");\
73  }
74 
75 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format)\
76  if (c->sample_fmt != format || c->sample_rate != srate ||\
77  c->channel_layout != ch_layout || c->channels != ch_count) {\
78  av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
79  return AVERROR(EINVAL);\
80  }
81 
83 {
84  AVBufferSrcParameters *par = av_mallocz(sizeof(*par));
85  if (!par)
86  return NULL;
87 
88  par->format = -1;
89 
90  return par;
91 }
92 
94 {
95  BufferSourceContext *s = ctx->priv;
96 
97  if (param->time_base.num > 0 && param->time_base.den > 0)
98  s->time_base = param->time_base;
99 
100  switch (ctx->filter->outputs[0].type) {
101  case AVMEDIA_TYPE_VIDEO:
102  if (param->format != AV_PIX_FMT_NONE) {
103  s->got_format_from_params = 1;
104  s->pix_fmt = param->format;
105  }
106  if (param->width > 0)
107  s->w = param->width;
108  if (param->height > 0)
109  s->h = param->height;
110  if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)
111  s->pixel_aspect = param->sample_aspect_ratio;
112  if (param->frame_rate.num > 0 && param->frame_rate.den > 0)
113  s->frame_rate = param->frame_rate;
114  if (param->hw_frames_ctx) {
117  if (!s->hw_frames_ctx)
118  return AVERROR(ENOMEM);
119  }
120  break;
121  case AVMEDIA_TYPE_AUDIO:
122  if (param->format != AV_SAMPLE_FMT_NONE) {
123  s->got_format_from_params = 1;
124  s->sample_fmt = param->format;
125  }
126  if (param->sample_rate > 0)
127  s->sample_rate = param->sample_rate;
128  if (param->channel_layout)
129  s->channel_layout = param->channel_layout;
130  break;
131  default:
132  return AVERROR_BUG;
133  }
134 
135  return 0;
136 }
137 
138 int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
139 {
140  return av_buffersrc_add_frame_flags(ctx, (AVFrame *)frame,
142 }
143 
145 {
146  return av_buffersrc_add_frame_flags(ctx, frame, 0);
147 }
148 
150  AVFrame *frame, int flags);
151 
153 {
154  AVFrame *copy = NULL;
155  int ret = 0;
156 
157  if (frame && frame->channel_layout &&
159  av_log(ctx, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");
160  return AVERROR(EINVAL);
161  }
162 
163  if (!(flags & AV_BUFFERSRC_FLAG_KEEP_REF) || !frame)
164  return av_buffersrc_add_frame_internal(ctx, frame, flags);
165 
166  if (!(copy = av_frame_alloc()))
167  return AVERROR(ENOMEM);
168  ret = av_frame_ref(copy, frame);
169  if (ret >= 0)
170  ret = av_buffersrc_add_frame_internal(ctx, copy, flags);
171 
172  av_frame_free(&copy);
173  return ret;
174 }
175 
177  AVFrame *frame, int flags)
178 {
179  BufferSourceContext *s = ctx->priv;
180  AVFrame *copy;
181  int refcounted, ret;
182 
183  s->nb_failed_requests = 0;
184 
185  if (!frame) {
186  s->eof = 1;
187  return 0;
188  } else if (s->eof)
189  return AVERROR(EINVAL);
190 
191  refcounted = !!frame->buf[0];
192 
193  if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {
194 
195  switch (ctx->outputs[0]->type) {
196  case AVMEDIA_TYPE_VIDEO:
197  CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
198  frame->format);
199  break;
200  case AVMEDIA_TYPE_AUDIO:
201  /* For layouts unknown on input but known on link after negotiation. */
202  if (!frame->channel_layout)
203  frame->channel_layout = s->channel_layout;
204  CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
205  av_frame_get_channels(frame), frame->format);
206  break;
207  default:
208  return AVERROR(EINVAL);
209  }
210 
211  }
212 
213  if (!av_fifo_space(s->fifo) &&
214  (ret = av_fifo_realloc2(s->fifo, av_fifo_size(s->fifo) +
215  sizeof(copy))) < 0)
216  return ret;
217 
218  if (!(copy = av_frame_alloc()))
219  return AVERROR(ENOMEM);
220 
221  if (refcounted) {
222  av_frame_move_ref(copy, frame);
223  } else {
224  ret = av_frame_ref(copy, frame);
225  if (ret < 0) {
226  av_frame_free(&copy);
227  return ret;
228  }
229  }
230 
231  if ((ret = av_fifo_generic_write(s->fifo, &copy, sizeof(copy), NULL)) < 0) {
232  if (refcounted)
233  av_frame_move_ref(frame, copy);
234  av_frame_free(&copy);
235  return ret;
236  }
237 
238  if ((flags & AV_BUFFERSRC_FLAG_PUSH))
239  if ((ret = ctx->output_pads[0].request_frame(ctx->outputs[0])) < 0)
240  return ret;
241 
242  return 0;
243 }
244 
246 {
247  BufferSourceContext *c = ctx->priv;
248 
249  if (!(c->pix_fmt != AV_PIX_FMT_NONE || c->got_format_from_params) || !c->w || !c->h ||
250  av_q2d(c->time_base) <= 0) {
251  av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");
252  return AVERROR(EINVAL);
253  }
254 
255  if (!(c->fifo = av_fifo_alloc(sizeof(AVFrame*))))
256  return AVERROR(ENOMEM);
257 
258  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",
259  c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),
261  c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));
262  c->warning_limit = 100;
263  return 0;
264 }
265 
267 {
268  return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;
269 }
270 
271 #define OFFSET(x) offsetof(BufferSourceContext, x)
272 #define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
273 #define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
274 
275 static const AVOption buffer_options[] = {
276  { "width", NULL, OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
277  { "video_size", NULL, OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, .flags = V },
278  { "height", NULL, OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
279  { "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 },
280 #if FF_API_OLD_FILTER_OPTS
281  /* those 4 are for compatibility with the old option passing system where each filter
282  * did its own parsing */
283  { "time_base_num", "deprecated, do not use", OFFSET(time_base.num), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
284  { "time_base_den", "deprecated, do not use", OFFSET(time_base.den), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
285  { "sar_num", "deprecated, do not use", OFFSET(pixel_aspect.num), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
286  { "sar_den", "deprecated, do not use", OFFSET(pixel_aspect.den), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
287 #endif
288  { "sar", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
289  { "pixel_aspect", "sample aspect ratio", OFFSET(pixel_aspect), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
290  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
291  { "frame_rate", NULL, OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
292  { "sws_param", NULL, OFFSET(sws_param), AV_OPT_TYPE_STRING, .flags = V },
293  { NULL },
294 };
295 
297 
298 static const AVOption abuffer_options[] = {
299  { "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
300  { "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
301  { "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 },
302  { "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
303  { "channels", NULL, OFFSET(channels), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
304  { NULL },
305 };
306 
307 AVFILTER_DEFINE_CLASS(abuffer);
308 
310 {
311  BufferSourceContext *s = ctx->priv;
312  int ret = 0;
313 
315  av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");
316  return AVERROR(EINVAL);
317  }
318 
319  if (s->channel_layout_str) {
320  int n;
321 
323  if (!s->channel_layout) {
324  av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
325  s->channel_layout_str);
326  return AVERROR(EINVAL);
327  }
329  if (s->channels) {
330  if (n != s->channels) {
331  av_log(ctx, AV_LOG_ERROR,
332  "Mismatching channel count %d and layout '%s' "
333  "(%d channels)\n",
334  s->channels, s->channel_layout_str, n);
335  return AVERROR(EINVAL);
336  }
337  }
338  s->channels = n;
339  } else if (!s->channels) {
340  av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "
341  "channel layout specified\n");
342  return AVERROR(EINVAL);
343  }
344 
345  if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*))))
346  return AVERROR(ENOMEM);
347 
348  if (!s->time_base.num)
349  s->time_base = (AVRational){1, s->sample_rate};
350 
351  av_log(ctx, AV_LOG_VERBOSE,
352  "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
355  s->warning_limit = 100;
356 
357  return ret;
358 }
359 
361 {
362  BufferSourceContext *s = ctx->priv;
363  while (s->fifo && av_fifo_size(s->fifo)) {
364  AVFrame *frame;
365  av_fifo_generic_read(s->fifo, &frame, sizeof(frame), NULL);
366  av_frame_free(&frame);
367  }
369  av_fifo_freep(&s->fifo);
370 }
371 
373 {
374  BufferSourceContext *c = ctx->priv;
377  AVFilterFormats *samplerates = NULL;
378  int ret;
379 
380  switch (ctx->outputs[0]->type) {
381  case AVMEDIA_TYPE_VIDEO:
382  if ((ret = ff_add_format (&formats, c->pix_fmt)) < 0 ||
383  (ret = ff_set_common_formats (ctx , formats )) < 0)
384  return ret;
385  break;
386  case AVMEDIA_TYPE_AUDIO:
387  if ((ret = ff_add_format (&formats , c->sample_fmt )) < 0 ||
388  (ret = ff_set_common_formats (ctx , formats )) < 0 ||
389  (ret = ff_add_format (&samplerates, c->sample_rate)) < 0 ||
390  (ret = ff_set_common_samplerates (ctx , samplerates )) < 0)
391  return ret;
392 
393  if ((ret = ff_add_channel_layout(&channel_layouts,
395  FF_COUNT2LAYOUT(c->channels))) < 0)
396  return ret;
397  if ((ret = ff_set_common_channel_layouts(ctx, channel_layouts)) < 0)
398  return ret;
399  break;
400  default:
401  return AVERROR(EINVAL);
402  }
403 
404  return 0;
405 }
406 
407 static int config_props(AVFilterLink *link)
408 {
409  BufferSourceContext *c = link->src->priv;
410 
411  switch (link->type) {
412  case AVMEDIA_TYPE_VIDEO:
413  link->w = c->w;
414  link->h = c->h;
416 
417  if (c->hw_frames_ctx) {
419  if (!link->hw_frames_ctx)
420  return AVERROR(ENOMEM);
421  }
422  break;
423  case AVMEDIA_TYPE_AUDIO:
424  if (!c->channel_layout)
425  c->channel_layout = link->channel_layout;
426  break;
427  default:
428  return AVERROR(EINVAL);
429  }
430 
431  link->time_base = c->time_base;
432  link->frame_rate = c->frame_rate;
433  return 0;
434 }
435 
436 static int request_frame(AVFilterLink *link)
437 {
438  BufferSourceContext *c = link->src->priv;
439  AVFrame *frame;
440  int ret;
441 
442  if (!av_fifo_size(c->fifo)) {
443  if (c->eof)
444  return AVERROR_EOF;
445  c->nb_failed_requests++;
446  return AVERROR(EAGAIN);
447  }
448  av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);
449 
450  ret = ff_filter_frame(link, frame);
451 
452  return ret;
453 }
454 
455 static int poll_frame(AVFilterLink *link)
456 {
457  BufferSourceContext *c = link->src->priv;
458  int size = av_fifo_size(c->fifo);
459  if (!size && c->eof)
460  return AVERROR_EOF;
461  return size/sizeof(AVFrame*);
462 }
463 
465  {
466  .name = "default",
467  .type = AVMEDIA_TYPE_VIDEO,
468  .request_frame = request_frame,
469  .poll_frame = poll_frame,
470  .config_props = config_props,
471  },
472  { NULL }
473 };
474 
476  .name = "buffer",
477  .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
478  .priv_size = sizeof(BufferSourceContext),
480 
481  .init = init_video,
482  .uninit = uninit,
483 
484  .inputs = NULL,
485  .outputs = avfilter_vsrc_buffer_outputs,
486  .priv_class = &buffer_class,
487 };
488 
490  {
491  .name = "default",
492  .type = AVMEDIA_TYPE_AUDIO,
493  .request_frame = request_frame,
494  .poll_frame = poll_frame,
495  .config_props = config_props,
496  },
497  { NULL }
498 };
499 
501  .name = "abuffer",
502  .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
503  .priv_size = sizeof(BufferSourceContext),
505 
506  .init = init_audio,
507  .uninit = uninit,
508 
509  .inputs = NULL,
510  .outputs = avfilter_asrc_abuffer_outputs,
511  .priv_class = &abuffer_class,
512 };
#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
const char * s
Definition: avisynth_c.h:768
static enum AVPixelFormat pix_fmt
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:124
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
AVOption.
Definition: opt.h:245
AVRational pixel_aspect
Definition: buffersrc.c:54
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:363
Memory buffer source API.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
Immediately push the frame to the output.
Definition: buffersrc.h:47
int num
Numerator.
Definition: rational.h:59
static enum AVSampleFormat formats[]
Definition: avresample.c:163
static av_cold int init_video(AVFilterContext *ctx)
Definition: buffersrc.c:245
static const AVFilterPad avfilter_vsrc_buffer_outputs[]
Definition: buffersrc.c:464
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:64
void av_frame_move_ref(AVFrame *dst, AVFrame *src)
Move everything contained in src to dst and reset src.
Definition: frame.c:509
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:252
enum AVPixelFormat pix_fmt
Definition: buffersrc.c:53
static av_cold void uninit(AVFilterContext *ctx)
Definition: buffersrc.c:360
AVRational frame_rate
Video only, the frame rate of the input video.
Definition: buffersrc.h:101
#define OFFSET(x)
Definition: buffersrc.c:271
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:500
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:66
const char * name
Pad name.
Definition: internal.h:59
AVRational sample_aspect_ratio
Video only, the sample (pixel) aspect ratio.
Definition: buffersrc.h:93
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:298
unsigned warning_limit
Definition: buffersrc.c:49
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1189
AVFilterPad * output_pads
array of output pads
Definition: avfilter.h:318
#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:141
int(* request_frame)(AVFilterLink *link)
Frame request callback.
Definition: internal.h:112
AVOptions.
AVRational time_base
The timebase to be used for the timestamps on the input frames.
Definition: buffersrc.h:83
static int poll_frame(AVFilterLink *link)
Definition: buffersrc.c:455
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:375
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
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 secon.
Definition: buffersrc.h:112
static const AVFilterPad avfilter_asrc_abuffer_outputs[]
Definition: buffersrc.c:489
ptrdiff_t size
Definition: opengl_enc.c:101
#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format)
Definition: buffersrc.c:75
#define av_log(a,...)
A filter pad used for either input or output.
Definition: internal.h:53
static void * av_x_if_null(const void *p, const void *x)
Return x default pointer in case p is NULL.
Definition: avutil.h:302
int width
width and height of the video frame
Definition: frame.h:236
#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:117
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:154
static int request_frame(AVFilterLink *link)
Definition: buffersrc.c:436
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
void * priv
private data for use by the filter
Definition: avfilter.h:322
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
#define A
Definition: buffersrc.c:272
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: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:79
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:349
common internal API header
AVFILTER_DEFINE_CLASS(buffer)
audio channel layout utility functions
This structure contains the parameters describing the frames that will be passed to this filter...
Definition: buffersrc.h:74
AVFormatContext * ctx
Definition: movenc.c:48
int n
Definition: avisynth_c.h:684
static const AVFilterPad outputs[]
Definition: af_afftfilt.c:386
static av_cold int init_audio(AVFilterContext *ctx)
Definition: buffersrc.c:309
Keep a reference to the frame.
Definition: buffersrc.h:54
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:248
AVBufferRef * hw_frames_ctx
Video with a hwaccel pixel format only.
Definition: buffersrc.h:107
Do not check for format changes.
Definition: buffersrc.h:42
sample_rate
static const AVFilterPad inputs[]
Definition: af_afftfilt.c:376
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:275
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:273
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:50
static const uint16_t channel_layouts[7]
Definition: dca_lbr.c:118
Describe the class of an AVClass context structure.
Definition: log.h:67
int sample_rate
Sample rate of the audio data.
Definition: frame.h:344
int av_frame_get_channels(const AVFrame *frame)
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:407
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:176
offset must point to two consecutive integers
Definition: opt.h:232
AVFifoBuffer * fifo
Definition: buffersrc.c:45
unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
Get the number of failed requests.
Definition: buffersrc.c:266
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:319
uint64_t channel_layout
Definition: buffersrc.c:63
static int flags
Definition: cpu.c:47
AVBufferRef * hw_frames_ctx
Definition: buffersrc.c:57
int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
Add a frame to the buffer source.
Definition: buffersrc.c:138
AVFilter ff_vsrc_buffer
Definition: buffersrc.c:475
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:93
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:92
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:152
unsigned nb_failed_requests
Definition: buffersrc.c:48
AVFifoBuffer * av_fifo_alloc(unsigned int size)
Initialize an AVFifoBuffer.
Definition: fifo.c:43
enum AVSampleFormat sample_fmt
Definition: buffersrc.c:61
static int query_formats(AVFilterContext *ctx)
Definition: buffersrc.c:372
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:82
An instance of a filter.
Definition: avfilter.h:307
int height
Definition: frame.h:236
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:88
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:2182
internal API functions
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:310
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:556
#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)
Definition: buffersrc.c:70
GLuint buffer
Definition: opengl_enc.c:102
int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
Add a frame to the buffer source.
Definition: buffersrc.c:144
char * channel_layout_str
Definition: buffersrc.c:64