FFmpeg  4.4.6
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 
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) {
119  av_buffer_unref(&s->hw_frames_ctx);
120  s->hw_frames_ctx = av_buffer_ref(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 
142 {
145 }
146 
148 {
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)
182  if (s->eof)
183  return AVERROR(EINVAL);
184 
185  refcounted = !!frame->buf[0];
186 
188 
189  switch (ctx->outputs[0]->type) {
190  case AVMEDIA_TYPE_VIDEO:
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;
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)) {
212  } else {
213  ret = av_frame_ref(copy, frame);
214  if (ret < 0) {
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),
254  c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,
255  c->pixel_aspect.num, c->pixel_aspect.den);
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 
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) {
316  s->channel_layout = av_get_channel_layout(s->channel_layout_str);
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  }
323  n = av_get_channel_layout_nb_channels(s->channel_layout);
324  if (s->channels) {
325  if (n != s->channels) {
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->sample_rate <= 0) {
341  av_log(ctx, AV_LOG_ERROR, "Sample rate not set\n");
342  return AVERROR(EINVAL);
343  }
344 
345  if (!s->time_base.num)
346  s->time_base = (AVRational){1, s->sample_rate};
347 
349  "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",
350  s->time_base.num, s->time_base.den, av_get_sample_fmt_name(s->sample_fmt),
351  s->sample_rate, s->channel_layout_str);
352 
353  return ret;
354 }
355 
357 {
358  BufferSourceContext *s = ctx->priv;
359  av_buffer_unref(&s->hw_frames_ctx);
360 }
361 
363 {
364  BufferSourceContext *c = ctx->priv;
367  AVFilterFormats *samplerates = NULL;
368  int ret;
369 
370  switch (ctx->outputs[0]->type) {
371  case AVMEDIA_TYPE_VIDEO:
372  if ((ret = ff_add_format (&formats, c->pix_fmt)) < 0 ||
373  (ret = ff_set_common_formats (ctx , formats )) < 0)
374  return ret;
375  break;
376  case AVMEDIA_TYPE_AUDIO:
377  if ((ret = ff_add_format (&formats , c->sample_fmt )) < 0 ||
378  (ret = ff_set_common_formats (ctx , formats )) < 0 ||
379  (ret = ff_add_format (&samplerates, c->sample_rate)) < 0 ||
380  (ret = ff_set_common_samplerates (ctx , samplerates )) < 0)
381  return ret;
382 
384  c->channel_layout ? c->channel_layout :
385  FF_COUNT2LAYOUT(c->channels))) < 0)
386  return ret;
388  return ret;
389  break;
390  default:
391  return AVERROR(EINVAL);
392  }
393 
394  return 0;
395 }
396 
397 static int config_props(AVFilterLink *link)
398 {
399  BufferSourceContext *c = link->src->priv;
400 
401  switch (link->type) {
402  case AVMEDIA_TYPE_VIDEO:
403  link->w = c->w;
404  link->h = c->h;
405  link->sample_aspect_ratio = c->pixel_aspect;
406 
407  if (c->hw_frames_ctx) {
408  link->hw_frames_ctx = av_buffer_ref(c->hw_frames_ctx);
409  if (!link->hw_frames_ctx)
410  return AVERROR(ENOMEM);
411  }
412  break;
413  case AVMEDIA_TYPE_AUDIO:
414  if (!c->channel_layout)
415  c->channel_layout = link->channel_layout;
416  break;
417  default:
418  return AVERROR(EINVAL);
419  }
420 
421  link->time_base = c->time_base;
422  link->frame_rate = c->frame_rate;
423  return 0;
424 }
425 
426 static int request_frame(AVFilterLink *link)
427 {
428  BufferSourceContext *c = link->src->priv;
429 
430  if (c->eof)
431  return AVERROR_EOF;
432  c->nb_failed_requests++;
433  return AVERROR(EAGAIN);
434 }
435 
437  {
438  .name = "default",
439  .type = AVMEDIA_TYPE_VIDEO,
440  .request_frame = request_frame,
441  .config_props = config_props,
442  },
443  { NULL }
444 };
445 
447  .name = "buffer",
448  .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
449  .priv_size = sizeof(BufferSourceContext),
451 
452  .init = init_video,
453  .uninit = uninit,
454 
455  .inputs = NULL,
457  .priv_class = &buffer_class,
458 };
459 
461  {
462  .name = "default",
463  .type = AVMEDIA_TYPE_AUDIO,
464  .request_frame = request_frame,
465  .config_props = config_props,
466  },
467  { NULL }
468 };
469 
471  .name = "abuffer",
472  .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
473  .priv_size = sizeof(BufferSourceContext),
475 
476  .init = init_audio,
477  .uninit = uninit,
478 
479  .inputs = NULL,
481  .priv_class = &abuffer_class,
482 };
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
channels
Definition: aptx.h:33
#define av_cold
Definition: attributes.h:88
simple assert() macros that are a bit more flexible than ISO C assert().
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1096
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
Main libavfilter public API header.
int ff_filter_graph_run_once(AVFilterGraph *graph)
Run one round of processing on a filter graph.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
static const AVFilterPad avfilter_asrc_abuffer_outputs[]
Definition: buffersrc.c:460
AVFilter ff_vsrc_buffer
Definition: buffersrc.c:446
static int push_frame(AVFilterGraph *graph)
Definition: buffersrc.c:152
#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format, pts)
Definition: buffersrc.c:77
#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format, pts)
Definition: buffersrc.c:70
static int query_formats(AVFilterContext *ctx)
Definition: buffersrc.c:362
AVFILTER_DEFINE_CLASS(buffer)
static const AVFilterPad avfilter_vsrc_buffer_outputs[]
Definition: buffersrc.c:436
static int request_frame(AVFilterLink *link)
Definition: buffersrc.c:426
static const AVOption buffer_options[]
Definition: buffersrc.c:274
#define A
Definition: buffersrc.c:271
static av_cold int init_audio(AVFilterContext *ctx)
Definition: buffersrc.c:302
static av_cold int init_video(AVFilterContext *ctx)
Definition: buffersrc.c:242
static av_cold void uninit(AVFilterContext *ctx)
Definition: buffersrc.c:356
#define OFFSET(x)
Definition: buffersrc.c:270
static const AVOption abuffer_options[]
Definition: buffersrc.c:291
AVFilter ff_asrc_abuffer
Definition: buffersrc.c:470
static int config_props(AVFilterLink *link)
Definition: buffersrc.c:397
#define V
Definition: buffersrc.c:272
Memory buffer source API.
#define flags(name, subs,...)
Definition: cbs_av1.c:572
#define s(width, name)
Definition: cbs_vp9.c:257
audio channel layout utility functions
common internal and external API header
#define NULL
Definition: coverity.c:32
long long int64_t
Definition: coverity.c:34
static const uint16_t channel_layouts[7]
Definition: dca_lbr.c:114
static enum AVPixelFormat pix_fmt
static AVFrame * frame
sample_rate
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
Definition: formats.c:338
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:587
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:332
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:575
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:568
#define FF_COUNT2LAYOUT(c)
Encode a channel count as a channel layout.
Definition: formats.h:103
reference-counted frame API
@ AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:235
@ AV_OPT_TYPE_PIXEL_FMT
Definition: opt.h:236
@ AV_OPT_TYPE_SAMPLE_FMT
Definition: opt.h:237
@ AV_OPT_TYPE_RATIONAL
Definition: opt.h:230
@ AV_OPT_TYPE_INT
Definition: opt.h:225
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
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 av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param)
Initialize the buffersrc or abuffersrc filter with the provided parameters.
Definition: buffersrc.c:98
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
int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
Add a frame to the buffer source.
Definition: buffersrc.c:141
int av_buffersrc_close(AVFilterContext *ctx, int64_t pts, unsigned flags)
Close the buffer source after EOF.
Definition: buffersrc.c:233
int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)
Add a frame to the buffer source.
Definition: buffersrc.c:147
unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)
Get the number of failed requests.
Definition: buffersrc.c:265
AVBufferSrcParameters * av_buffersrc_parameters_alloc(void)
Allocate a new AVBufferSrcParameters instance.
Definition: buffersrc.c:87
@ AV_BUFFERSRC_FLAG_KEEP_REF
Keep a reference to the frame.
Definition: buffersrc.h:53
@ AV_BUFFERSRC_FLAG_PUSH
Immediately push the frame to the output.
Definition: buffersrc.h:46
@ AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT
Do not check for format changes.
Definition: buffersrc.h:41
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
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:93
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:50
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
void av_frame_move_ref(AVFrame *dst, AVFrame *src)
Move everything contained in src to dst and reset src.
Definition: frame.c:582
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
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:210
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
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
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
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
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
misc image utilities
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
#define attribute_align_arg
Definition: internal.h:61
uint8_t w
Definition: llviddspenc.c:39
AVOptions.
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
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
static char buffer[20]
Definition: seek.c:32
formats
Definition: signature.h:48
A reference to a data buffer.
Definition: buffer.h:84
This structure contains the parameters describing the frames that will be passed to this filter.
Definition: buffersrc.h:73
AVRational frame_rate
Video only, the frame rate of the input video.
Definition: buffersrc.h:100
int sample_rate
Audio only, the audio sampling rate in samples per second.
Definition: buffersrc.h:111
int format
video: the pixel format, value corresponds to enum AVPixelFormat audio: the sample format,...
Definition: buffersrc.h:78
int width
Video only, the display dimensions of the input frames.
Definition: buffersrc.h:87
AVRational time_base
The timebase to be used for the timestamps on the input frames.
Definition: buffersrc.h:82
AVBufferRef * hw_frames_ctx
Video with a hwaccel pixel format only.
Definition: buffersrc.h:106
AVRational sample_aspect_ratio
Video only, the sample (pixel) aspect ratio.
Definition: buffersrc.h:92
uint64_t channel_layout
Audio only, the audio channel layout.
Definition: buffersrc.h:116
Describe the class of an AVClass context structure.
Definition: log.h:67
A list of supported channel layouts.
Definition: formats.h:86
An instance of a filter.
Definition: avfilter.h:341
void * priv
private data for use by the filter
Definition: avfilter.h:356
A list of supported formats for one end of a filter link.
Definition: formats.h:65
A filter pad used for either input or output.
Definition: internal.h:54
const char * name
Pad name.
Definition: internal.h:60
Filter definition.
Definition: avfilter.h:145
const char * name
Filter name.
Definition: avfilter.h:149
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:411
int width
Definition: frame.h:376
int height
Definition: frame.h:376
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:509
int channels
number of audio channels, only used for audio.
Definition: frame.h:624
uint64_t channel_layout
Channel layout of the audio data.
Definition: frame.h:495
int sample_rate
Sample rate of the audio data.
Definition: frame.h:490
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:391
AVOption.
Definition: opt.h:248
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int num
Numerator.
Definition: rational.h:59
int den
Denominator.
Definition: rational.h:60
AVRational pixel_aspect
Definition: buffersrc.c:53
enum AVPixelFormat pix_fmt
Definition: buffersrc.c:52
AVRational time_base
time_base to set in the output link
Definition: buffersrc.c:46
uint64_t channel_layout
Definition: buffersrc.c:64
unsigned nb_failed_requests
Definition: buffersrc.c:48
AVBufferRef * hw_frames_ctx
Definition: buffersrc.c:58
enum AVSampleFormat sample_fmt
Definition: buffersrc.c:62
char * channel_layout_str
Definition: buffersrc.c:65
AVRational frame_rate
frame_rate to set in the output link
Definition: buffersrc.c:47
#define av_log(a,...)
AVFormatContext * ctx
Definition: movenc.c:48
timestamp utils, mostly useful for debugging/logging purposes
static int64_t pts
static void copy(const float *p1, float *p2, const int length)
static double c[64]