FFmpeg
avf_concat.c
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1 /*
2  * Copyright (c) 2012 Nicolas George
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.
14  * See the GNU Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public License
17  * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * concat audio-video filter
24  */
25 
26 #include "libavutil/avassert.h"
27 #include "libavutil/avstring.h"
29 #include "libavutil/opt.h"
30 #include "avfilter.h"
31 #include "filters.h"
32 #include "internal.h"
33 #include "video.h"
34 #include "audio.h"
35 
36 #define TYPE_ALL 2
37 
38 typedef struct ConcatContext {
39  const AVClass *class;
40  unsigned nb_streams[TYPE_ALL]; /**< number of out streams of each type */
41  unsigned nb_segments;
42  unsigned cur_idx; /**< index of the first input of current segment */
43  int64_t delta_ts; /**< timestamp to add to produce output timestamps */
44  unsigned nb_in_active; /**< number of active inputs in current segment */
45  unsigned unsafe;
46  struct concat_in {
47  int64_t pts;
48  int64_t nb_frames;
49  unsigned eof;
50  } *in;
52 
53 #define OFFSET(x) offsetof(ConcatContext, x)
54 #define A AV_OPT_FLAG_AUDIO_PARAM
55 #define F AV_OPT_FLAG_FILTERING_PARAM
56 #define V AV_OPT_FLAG_VIDEO_PARAM
57 
58 static const AVOption concat_options[] = {
59  { "n", "specify the number of segments", OFFSET(nb_segments),
60  AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, V|A|F},
61  { "v", "specify the number of video streams",
63  AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, V|F },
64  { "a", "specify the number of audio streams",
66  AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A|F},
67  { "unsafe", "enable unsafe mode",
68  OFFSET(unsafe),
69  AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, V|A|F},
70  { NULL }
71 };
72 
73 AVFILTER_DEFINE_CLASS(concat);
74 
76 {
77  ConcatContext *cat = ctx->priv;
78  unsigned type, nb_str, idx0 = 0, idx, str, seg;
81  int ret;
82 
83  for (type = 0; type < TYPE_ALL; type++) {
84  nb_str = cat->nb_streams[type];
85  for (str = 0; str < nb_str; str++) {
86  idx = idx0;
87 
88  /* Set the output formats */
89  formats = ff_all_formats(type);
90  if ((ret = ff_formats_ref(formats, &ctx->outputs[idx]->in_formats)) < 0)
91  return ret;
92 
93  if (type == AVMEDIA_TYPE_AUDIO) {
94  rates = ff_all_samplerates();
95  if ((ret = ff_formats_ref(rates, &ctx->outputs[idx]->in_samplerates)) < 0)
96  return ret;
97  layouts = ff_all_channel_layouts();
98  if ((ret = ff_channel_layouts_ref(layouts, &ctx->outputs[idx]->in_channel_layouts)) < 0)
99  return ret;
100  }
101 
102  /* Set the same formats for each corresponding input */
103  for (seg = 0; seg < cat->nb_segments; seg++) {
104  if ((ret = ff_formats_ref(formats, &ctx->inputs[idx]->out_formats)) < 0)
105  return ret;
106  if (type == AVMEDIA_TYPE_AUDIO) {
107  if ((ret = ff_formats_ref(rates, &ctx->inputs[idx]->out_samplerates)) < 0 ||
108  (ret = ff_channel_layouts_ref(layouts, &ctx->inputs[idx]->out_channel_layouts)) < 0)
109  return ret;
110  }
111  idx += ctx->nb_outputs;
112  }
113 
114  idx0++;
115  }
116  }
117  return 0;
118 }
119 
120 static int config_output(AVFilterLink *outlink)
121 {
122  AVFilterContext *ctx = outlink->src;
123  ConcatContext *cat = ctx->priv;
124  unsigned out_no = FF_OUTLINK_IDX(outlink);
125  unsigned in_no = out_no, seg;
126  AVFilterLink *inlink = ctx->inputs[in_no];
127 
128  /* enhancement: find a common one */
129  outlink->time_base = AV_TIME_BASE_Q;
130  outlink->w = inlink->w;
131  outlink->h = inlink->h;
132  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
133  outlink->format = inlink->format;
134  outlink->frame_rate = inlink->frame_rate;
135 
136  for (seg = 1; seg < cat->nb_segments; seg++) {
137  inlink = ctx->inputs[in_no + seg * ctx->nb_outputs];
138  if (outlink->frame_rate.num != inlink->frame_rate.num ||
139  outlink->frame_rate.den != inlink->frame_rate.den) {
140  av_log(ctx, AV_LOG_VERBOSE,
141  "Video inputs have different frame rates, output will be VFR\n");
142  outlink->frame_rate = av_make_q(1, 0);
143  break;
144  }
145  }
146 
147  for (seg = 1; seg < cat->nb_segments; seg++) {
148  inlink = ctx->inputs[in_no + seg * ctx->nb_outputs];
149  if (!outlink->sample_aspect_ratio.num)
150  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
151  /* possible enhancement: unsafe mode, do not check */
152  if (outlink->w != inlink->w ||
153  outlink->h != inlink->h ||
154  outlink->sample_aspect_ratio.num != inlink->sample_aspect_ratio.num &&
155  inlink->sample_aspect_ratio.num ||
156  outlink->sample_aspect_ratio.den != inlink->sample_aspect_ratio.den) {
157  av_log(ctx, AV_LOG_ERROR, "Input link %s parameters "
158  "(size %dx%d, SAR %d:%d) do not match the corresponding "
159  "output link %s parameters (%dx%d, SAR %d:%d)\n",
160  ctx->input_pads[in_no].name, inlink->w, inlink->h,
161  inlink->sample_aspect_ratio.num,
162  inlink->sample_aspect_ratio.den,
163  ctx->input_pads[out_no].name, outlink->w, outlink->h,
164  outlink->sample_aspect_ratio.num,
165  outlink->sample_aspect_ratio.den);
166  if (!cat->unsafe)
167  return AVERROR(EINVAL);
168  }
169  }
170 
171  return 0;
172 }
173 
174 static int push_frame(AVFilterContext *ctx, unsigned in_no, AVFrame *buf)
175 {
176  ConcatContext *cat = ctx->priv;
177  unsigned out_no = in_no % ctx->nb_outputs;
178  AVFilterLink * inlink = ctx-> inputs[ in_no];
179  AVFilterLink *outlink = ctx->outputs[out_no];
180  struct concat_in *in = &cat->in[in_no];
181 
182  buf->pts = av_rescale_q(buf->pts, inlink->time_base, outlink->time_base);
183  in->pts = buf->pts;
184  in->nb_frames++;
185  /* add duration to input PTS */
186  if (inlink->sample_rate)
187  /* use number of audio samples */
188  in->pts += av_rescale_q(buf->nb_samples,
189  av_make_q(1, inlink->sample_rate),
190  outlink->time_base);
191  else if (in->nb_frames >= 2)
192  /* use mean duration */
193  in->pts = av_rescale(in->pts, in->nb_frames, in->nb_frames - 1);
194 
195  buf->pts += cat->delta_ts;
196  return ff_filter_frame(outlink, buf);
197 }
198 
200 {
201  AVFilterContext *ctx = inlink->dst;
202  unsigned in_no = FF_INLINK_IDX(inlink);
203  AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs];
204 
205  return ff_get_video_buffer(outlink, w, h);
206 }
207 
208 static AVFrame *get_audio_buffer(AVFilterLink *inlink, int nb_samples)
209 {
210  AVFilterContext *ctx = inlink->dst;
211  unsigned in_no = FF_INLINK_IDX(inlink);
212  AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs];
213 
214  return ff_get_audio_buffer(outlink, nb_samples);
215 }
216 
217 static void close_input(AVFilterContext *ctx, unsigned in_no)
218 {
219  ConcatContext *cat = ctx->priv;
220 
221  cat->in[in_no].eof = 1;
222  cat->nb_in_active--;
223  av_log(ctx, AV_LOG_VERBOSE, "EOF on %s, %d streams left in segment.\n",
224  ctx->input_pads[in_no].name, cat->nb_in_active);
225 }
226 
227 static void find_next_delta_ts(AVFilterContext *ctx, int64_t *seg_delta)
228 {
229  ConcatContext *cat = ctx->priv;
230  unsigned i = cat->cur_idx;
231  unsigned imax = i + ctx->nb_outputs;
232  int64_t pts;
233 
234  pts = cat->in[i++].pts;
235  for (; i < imax; i++)
236  pts = FFMAX(pts, cat->in[i].pts);
237  cat->delta_ts += pts;
238  *seg_delta = pts;
239 }
240 
241 static int send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no,
242  int64_t seg_delta)
243 {
244  ConcatContext *cat = ctx->priv;
245  AVFilterLink *outlink = ctx->outputs[out_no];
246  int64_t base_pts = cat->in[in_no].pts + cat->delta_ts - seg_delta;
247  int64_t nb_samples, sent = 0;
248  int frame_nb_samples, ret;
249  AVRational rate_tb = { 1, ctx->inputs[in_no]->sample_rate };
250  AVFrame *buf;
251 
252  if (!rate_tb.den)
253  return AVERROR_BUG;
254  nb_samples = av_rescale_q(seg_delta - cat->in[in_no].pts,
255  outlink->time_base, rate_tb);
256  frame_nb_samples = FFMAX(9600, rate_tb.den / 5); /* arbitrary */
257  while (nb_samples) {
258  frame_nb_samples = FFMIN(frame_nb_samples, nb_samples);
259  buf = ff_get_audio_buffer(outlink, frame_nb_samples);
260  if (!buf)
261  return AVERROR(ENOMEM);
262  av_samples_set_silence(buf->extended_data, 0, frame_nb_samples,
263  outlink->channels, outlink->format);
264  buf->pts = base_pts + av_rescale_q(sent, rate_tb, outlink->time_base);
265  ret = ff_filter_frame(outlink, buf);
266  if (ret < 0)
267  return ret;
268  sent += frame_nb_samples;
269  nb_samples -= frame_nb_samples;
270  }
271  return 0;
272 }
273 
275 {
276  int ret;
277  ConcatContext *cat = ctx->priv;
278  unsigned str, str_max;
279  int64_t seg_delta;
280 
281  find_next_delta_ts(ctx, &seg_delta);
282  cat->cur_idx += ctx->nb_outputs;
283  cat->nb_in_active = ctx->nb_outputs;
284  av_log(ctx, AV_LOG_VERBOSE, "Segment finished at pts=%"PRId64"\n",
285  cat->delta_ts);
286 
287  if (cat->cur_idx < ctx->nb_inputs) {
288  /* pad audio streams with silence */
289  str = cat->nb_streams[AVMEDIA_TYPE_VIDEO];
290  str_max = str + cat->nb_streams[AVMEDIA_TYPE_AUDIO];
291  for (; str < str_max; str++) {
292  ret = send_silence(ctx, cat->cur_idx - ctx->nb_outputs + str, str,
293  seg_delta);
294  if (ret < 0)
295  return ret;
296  }
297  }
298  return 0;
299 }
300 
302 {
303  ConcatContext *cat = ctx->priv;
304  unsigned seg, type, str;
305  int ret;
306 
307  /* create input pads */
308  for (seg = 0; seg < cat->nb_segments; seg++) {
309  for (type = 0; type < TYPE_ALL; type++) {
310  for (str = 0; str < cat->nb_streams[type]; str++) {
311  AVFilterPad pad = {
312  .type = type,
313  .get_video_buffer = get_video_buffer,
314  .get_audio_buffer = get_audio_buffer,
315  };
316  pad.name = av_asprintf("in%d:%c%d", seg, "va"[type], str);
317  if ((ret = ff_insert_inpad(ctx, ctx->nb_inputs, &pad)) < 0) {
318  av_freep(&pad.name);
319  return ret;
320  }
321  }
322  }
323  }
324  /* create output pads */
325  for (type = 0; type < TYPE_ALL; type++) {
326  for (str = 0; str < cat->nb_streams[type]; str++) {
327  AVFilterPad pad = {
328  .type = type,
329  .config_props = config_output,
330  };
331  pad.name = av_asprintf("out:%c%d", "va"[type], str);
332  if ((ret = ff_insert_outpad(ctx, ctx->nb_outputs, &pad)) < 0) {
333  av_freep(&pad.name);
334  return ret;
335  }
336  }
337  }
338 
339  cat->in = av_calloc(ctx->nb_inputs, sizeof(*cat->in));
340  if (!cat->in)
341  return AVERROR(ENOMEM);
342  cat->nb_in_active = ctx->nb_outputs;
343  return 0;
344 }
345 
347 {
348  ConcatContext *cat = ctx->priv;
349  unsigned i;
350 
351  for (i = 0; i < ctx->nb_inputs; i++)
352  av_freep(&ctx->input_pads[i].name);
353  for (i = 0; i < ctx->nb_outputs; i++)
354  av_freep(&ctx->output_pads[i].name);
355  av_freep(&cat->in);
356 }
357 
359 {
360  ConcatContext *cat = ctx->priv;
361  AVFrame *frame;
362  unsigned i, j;
363  int ret, status;
364  int64_t pts;
365 
366  /* Forward status back */
367  for (i = 0; i < ctx->nb_outputs; i++) {
368  status = ff_outlink_get_status(ctx->outputs[i]);
369  if (!status)
370  continue;
371  for (j = i; j < ctx->nb_inputs; j += ctx->nb_outputs) {
372  if (!cat->in[j].eof) {
373  cat->in[j].eof = 1;
374  ff_inlink_set_status(ctx->inputs[j], status);
375  return 0;
376  }
377  }
378 
379  }
380 
381  /* Forward available frames */
382  if (cat->cur_idx < ctx->nb_inputs) {
383  for (i = 0; i < ctx->nb_outputs; i++) {
384  ret = ff_inlink_consume_frame(ctx->inputs[cat->cur_idx + i], &frame);
385  if (ret < 0)
386  return ret;
387  if (ret) {
388  ff_filter_set_ready(ctx, 10);
389  return push_frame(ctx, cat->cur_idx + i, frame);
390  }
391  }
392  }
393 
394  /* Forward status change */
395  if (cat->cur_idx < ctx->nb_inputs) {
396  for (i = 0; i < ctx->nb_outputs; i++) {
397  ret = ff_inlink_acknowledge_status(ctx->inputs[cat->cur_idx + i], &status, &pts);
398  /* TODO use pts */
399  if (ret > 0) {
400  close_input(ctx, cat->cur_idx + i);
401  if (cat->cur_idx + ctx->nb_outputs >= ctx->nb_inputs) {
402  ff_outlink_set_status(ctx->outputs[i], status, pts);
403  }
404  if (!cat->nb_in_active) {
405  ret = flush_segment(ctx);
406  if (ret < 0)
407  return ret;
408  }
409  ff_filter_set_ready(ctx, 10);
410  return 0;
411  }
412  }
413  }
414 
415  ret = FFERROR_NOT_READY;
416  for (i = 0; i < ctx->nb_outputs; i++) {
417  if (ff_outlink_frame_wanted(ctx->outputs[i])) {
418  if (cat->in[cat->cur_idx + i].eof) {
419  for (j = 0; j < ctx->nb_outputs; j++)
420  if (!cat->in[cat->cur_idx + j].eof)
421  ff_inlink_request_frame(ctx->inputs[cat->cur_idx + j]);
422  return 0;
423  } else {
424  ff_inlink_request_frame(ctx->inputs[cat->cur_idx + i]);
425  ret = 0;
426  }
427  }
428  }
429 
430  return ret;
431 }
432 
433 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
434  char *res, int res_len, int flags)
435 {
436  int ret = AVERROR(ENOSYS);
437 
438  if (!strcmp(cmd, "next")) {
439  av_log(ctx, AV_LOG_VERBOSE, "Command received: next\n");
440  return flush_segment(ctx);
441  }
442 
443  return ret;
444 }
445 
447  .name = "concat",
448  .description = NULL_IF_CONFIG_SMALL("Concatenate audio and video streams."),
449  .init = init,
450  .uninit = uninit,
451  .query_formats = query_formats,
452  .activate = activate,
453  .priv_size = sizeof(ConcatContext),
454  .inputs = NULL,
455  .outputs = NULL,
456  .priv_class = &concat_class,
459 };
int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe)
Take a frame from the link&#39;s FIFO and update the link&#39;s stats.
Definition: avfilter.c:1494
#define NULL
Definition: coverity.c:32
static AVFrame * get_audio_buffer(AVFilterLink *inlink, int nb_samples)
Definition: avf_concat.c:208
static int flush_segment(AVFilterContext *ctx)
Definition: avf_concat.c:274
static int send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no, int64_t seg_delta)
Definition: avf_concat.c:241
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
static av_cold int init(AVFilterContext *ctx)
Definition: avf_concat.c:301
AVOption.
Definition: opt.h:246
unsigned nb_streams[TYPE_ALL]
number of out streams of each type
Definition: avf_concat.c:40
Main libavfilter public API header.
#define AVFILTER_FLAG_DYNAMIC_INPUTS
The number of the filter inputs is not determined just by AVFilter.inputs.
Definition: avfilter.h:105
int num
Numerator.
Definition: rational.h:59
GLint GLenum type
Definition: opengl_enc.c:104
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:65
#define FF_OUTLINK_IDX(link)
Definition: internal.h:349
return FFERROR_NOT_READY
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:99
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
Definition: filters.h:189
void ff_inlink_request_frame(AVFilterLink *link)
Mark that a frame is wanted on the link.
Definition: avfilter.c:1620
AVFilter ff_avf_concat
Definition: avf_concat.c:446
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:244
#define V
Definition: avf_concat.c:56
static av_cold void uninit(AVFilterContext *ctx)
Definition: avf_concat.c:346
const char * name
Pad name.
Definition: internal.h:60
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:346
int ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
Add *ref as a new reference to f.
Definition: formats.c:434
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1093
AVFilterPad * output_pads
array of output pads
Definition: avfilter.h:349
#define av_cold
Definition: attributes.h:82
AVOptions.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:388
static AVFrame * get_video_buffer(AVFilterLink *inlink, int w, int h)
Definition: avf_concat.c:199
static int push_frame(AVFilterContext *ctx, unsigned in_no, AVFrame *buf)
Definition: avf_concat.c:174
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
#define AVFILTER_FLAG_DYNAMIC_OUTPUTS
The number of the filter outputs is not determined just by AVFilter.outputs.
Definition: avfilter.h:111
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
Definition: avf_concat.c:433
the definition of that something depends on the semantic of the filter The callback must examine the status of the filter s links and proceed accordingly The status of output links is stored in the status_in and status_out fields and tested by the ff_outlink_frame_wanted() function.If this function returns true
#define av_log(a,...)
AVFilterFormats * ff_all_formats(enum AVMediaType type)
Return a list of all formats supported by FFmpeg for the given media type.
Definition: formats.c:349
A filter pad used for either input or output.
Definition: internal.h:54
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts)
Test and acknowledge the change of status on the link.
Definition: avfilter.c:1449
static int activate(AVFilterContext *ctx)
Definition: avf_concat.c:358
AVFilterPad * input_pads
array of input pads
Definition: avfilter.h:345
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt)
Fill an audio buffer with silence.
Definition: samplefmt.c:237
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
Definition: audio.c:86
unsigned nb_outputs
number of output pads
Definition: avfilter.h:351
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
void * priv
private data for use by the filter
Definition: avfilter.h:353
#define A
Definition: avf_concat.c:54
simple assert() macros that are a bit more flexible than ISO C assert().
#define FFMAX(a, b)
Definition: common.h:94
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:113
int64_t delta_ts
timestamp to add to produce output timestamps
Definition: avf_concat.c:43
audio channel layout utility functions
unsigned nb_inputs
number of input pads
Definition: avfilter.h:347
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
#define FFMIN(a, b)
Definition: common.h:96
int ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
Add *ref as a new reference to formats.
Definition: formats.c:439
static void close_input(AVFilterContext *ctx, unsigned in_no)
Definition: avf_concat.c:217
uint8_t w
Definition: llviddspenc.c:38
static void find_next_delta_ts(AVFilterContext *ctx, int64_t *seg_delta)
Definition: avf_concat.c:227
unsigned nb_segments
Definition: avf_concat.c:41
static const AVClass concat_class
Definition: concatdec.c:777
AVFormatContext * ctx
Definition: movenc.c:48
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
AVFilterChannelLayouts * ff_all_channel_layouts(void)
Construct an empty AVFilterChannelLayouts/AVFilterFormats struct – representing any channel layout (...
Definition: formats.c:400
#define cat(a, bpp, b)
Definition: vp9dsp_init.h:29
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
A list of supported channel layouts.
Definition: formats.h:85
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
static AVRational av_make_q(int num, int den)
Create an AVRational.
Definition: rational.h:71
unsigned cur_idx
index of the first input of current segment
Definition: avf_concat.c:42
void * buf
Definition: avisynth_c.h:766
#define OFFSET(x)
Definition: avf_concat.c:53
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
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:50
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
int ff_outlink_get_status(AVFilterLink *link)
Get the status on an output link.
Definition: avfilter.c:1643
Rational number (pair of numerator and denominator).
Definition: rational.h:58
they must not be accessed directly The fifo field contains the frames that are queued in the input for processing by the filter The status_in and status_out fields contains the queued status(EOF or error) of the link
unsigned nb_in_active
number of active inputs in current segment
Definition: avf_concat.c:44
void ff_inlink_set_status(AVFilterLink *link, int status)
Set the status on an input link.
Definition: avfilter.c:1628
const char * name
Filter name.
Definition: avfilter.h:148
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:394
#define flags(name, subs,...)
Definition: cbs_av1.c:561
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
#define FF_INLINK_IDX(link)
Find the index of a link.
Definition: internal.h:348
static int query_formats(AVFilterContext *ctx)
Definition: avf_concat.c:75
#define TYPE_ALL
Definition: avf_concat.c:36
void ff_filter_set_ready(AVFilterContext *filter, unsigned priority)
Mark a filter ready and schedule it for activation.
Definition: avfilter.c:193
#define F
Definition: avf_concat.c:55
unsigned unsafe
Definition: avf_concat.c:45
int den
Denominator.
Definition: rational.h:60
static int config_output(AVFilterLink *outlink)
Definition: avf_concat.c:120
struct ConcatContext::concat_in * in
A list of supported formats for one end of a filter link.
Definition: formats.h:64
An instance of a filter.
Definition: avfilter.h:338
AVFILTER_DEFINE_CLASS(concat)
#define av_freep(p)
static const AVOption concat_options[]
Definition: avf_concat.c:58
formats
Definition: signature.h:48
internal API functions
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:342
static const int rates[]
Definition: avresample.c:176
static int ff_insert_outpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new output pad for the filter.
Definition: internal.h:285
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:361
static int ff_insert_inpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new input pad for the filter.
Definition: internal.h:277