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  for (seg = 1; seg < cat->nb_segments; seg++) {
135  inlink = ctx->inputs[in_no += ctx->nb_outputs];
136  if (!outlink->sample_aspect_ratio.num)
137  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
138  /* possible enhancement: unsafe mode, do not check */
139  if (outlink->w != inlink->w ||
140  outlink->h != inlink->h ||
141  outlink->sample_aspect_ratio.num != inlink->sample_aspect_ratio.num &&
142  inlink->sample_aspect_ratio.num ||
143  outlink->sample_aspect_ratio.den != inlink->sample_aspect_ratio.den) {
144  av_log(ctx, AV_LOG_ERROR, "Input link %s parameters "
145  "(size %dx%d, SAR %d:%d) do not match the corresponding "
146  "output link %s parameters (%dx%d, SAR %d:%d)\n",
147  ctx->input_pads[in_no].name, inlink->w, inlink->h,
148  inlink->sample_aspect_ratio.num,
149  inlink->sample_aspect_ratio.den,
150  ctx->input_pads[out_no].name, outlink->w, outlink->h,
151  outlink->sample_aspect_ratio.num,
152  outlink->sample_aspect_ratio.den);
153  if (!cat->unsafe)
154  return AVERROR(EINVAL);
155  }
156  }
157 
158  return 0;
159 }
160 
161 static int push_frame(AVFilterContext *ctx, unsigned in_no, AVFrame *buf)
162 {
163  ConcatContext *cat = ctx->priv;
164  unsigned out_no = in_no % ctx->nb_outputs;
165  AVFilterLink * inlink = ctx-> inputs[ in_no];
166  AVFilterLink *outlink = ctx->outputs[out_no];
167  struct concat_in *in = &cat->in[in_no];
168 
169  buf->pts = av_rescale_q(buf->pts, inlink->time_base, outlink->time_base);
170  in->pts = buf->pts;
171  in->nb_frames++;
172  /* add duration to input PTS */
173  if (inlink->sample_rate)
174  /* use number of audio samples */
175  in->pts += av_rescale_q(buf->nb_samples,
176  av_make_q(1, inlink->sample_rate),
177  outlink->time_base);
178  else if (in->nb_frames >= 2)
179  /* use mean duration */
180  in->pts = av_rescale(in->pts, in->nb_frames, in->nb_frames - 1);
181 
182  buf->pts += cat->delta_ts;
183  return ff_filter_frame(outlink, buf);
184 }
185 
187 {
188  AVFilterContext *ctx = inlink->dst;
189  unsigned in_no = FF_INLINK_IDX(inlink);
190  AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs];
191 
192  return ff_get_video_buffer(outlink, w, h);
193 }
194 
195 static AVFrame *get_audio_buffer(AVFilterLink *inlink, int nb_samples)
196 {
197  AVFilterContext *ctx = inlink->dst;
198  unsigned in_no = FF_INLINK_IDX(inlink);
199  AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs];
200 
201  return ff_get_audio_buffer(outlink, nb_samples);
202 }
203 
204 static void close_input(AVFilterContext *ctx, unsigned in_no)
205 {
206  ConcatContext *cat = ctx->priv;
207 
208  cat->in[in_no].eof = 1;
209  cat->nb_in_active--;
210  av_log(ctx, AV_LOG_VERBOSE, "EOF on %s, %d streams left in segment.\n",
211  ctx->input_pads[in_no].name, cat->nb_in_active);
212 }
213 
214 static void find_next_delta_ts(AVFilterContext *ctx, int64_t *seg_delta)
215 {
216  ConcatContext *cat = ctx->priv;
217  unsigned i = cat->cur_idx;
218  unsigned imax = i + ctx->nb_outputs;
219  int64_t pts;
220 
221  pts = cat->in[i++].pts;
222  for (; i < imax; i++)
223  pts = FFMAX(pts, cat->in[i].pts);
224  cat->delta_ts += pts;
225  *seg_delta = pts;
226 }
227 
228 static int send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no,
229  int64_t seg_delta)
230 {
231  ConcatContext *cat = ctx->priv;
232  AVFilterLink *outlink = ctx->outputs[out_no];
233  int64_t base_pts = cat->in[in_no].pts + cat->delta_ts - seg_delta;
234  int64_t nb_samples, sent = 0;
235  int frame_nb_samples, ret;
236  AVRational rate_tb = { 1, ctx->inputs[in_no]->sample_rate };
237  AVFrame *buf;
238 
239  if (!rate_tb.den)
240  return AVERROR_BUG;
241  nb_samples = av_rescale_q(seg_delta - cat->in[in_no].pts,
242  outlink->time_base, rate_tb);
243  frame_nb_samples = FFMAX(9600, rate_tb.den / 5); /* arbitrary */
244  while (nb_samples) {
245  frame_nb_samples = FFMIN(frame_nb_samples, nb_samples);
246  buf = ff_get_audio_buffer(outlink, frame_nb_samples);
247  if (!buf)
248  return AVERROR(ENOMEM);
249  av_samples_set_silence(buf->extended_data, 0, frame_nb_samples,
250  outlink->channels, outlink->format);
251  buf->pts = base_pts + av_rescale_q(sent, rate_tb, outlink->time_base);
252  ret = ff_filter_frame(outlink, buf);
253  if (ret < 0)
254  return ret;
255  sent += frame_nb_samples;
256  nb_samples -= frame_nb_samples;
257  }
258  return 0;
259 }
260 
262 {
263  int ret;
264  ConcatContext *cat = ctx->priv;
265  unsigned str, str_max;
266  int64_t seg_delta;
267 
268  find_next_delta_ts(ctx, &seg_delta);
269  cat->cur_idx += ctx->nb_outputs;
270  cat->nb_in_active = ctx->nb_outputs;
271  av_log(ctx, AV_LOG_VERBOSE, "Segment finished at pts=%"PRId64"\n",
272  cat->delta_ts);
273 
274  if (cat->cur_idx < ctx->nb_inputs) {
275  /* pad audio streams with silence */
276  str = cat->nb_streams[AVMEDIA_TYPE_VIDEO];
277  str_max = str + cat->nb_streams[AVMEDIA_TYPE_AUDIO];
278  for (; str < str_max; str++) {
279  ret = send_silence(ctx, cat->cur_idx - ctx->nb_outputs + str, str,
280  seg_delta);
281  if (ret < 0)
282  return ret;
283  }
284  }
285  return 0;
286 }
287 
289 {
290  ConcatContext *cat = ctx->priv;
291  unsigned seg, type, str;
292  int ret;
293 
294  /* create input pads */
295  for (seg = 0; seg < cat->nb_segments; seg++) {
296  for (type = 0; type < TYPE_ALL; type++) {
297  for (str = 0; str < cat->nb_streams[type]; str++) {
298  AVFilterPad pad = {
299  .type = type,
300  .get_video_buffer = get_video_buffer,
301  .get_audio_buffer = get_audio_buffer,
302  };
303  pad.name = av_asprintf("in%d:%c%d", seg, "va"[type], str);
304  if ((ret = ff_insert_inpad(ctx, ctx->nb_inputs, &pad)) < 0) {
305  av_freep(&pad.name);
306  return ret;
307  }
308  }
309  }
310  }
311  /* create output pads */
312  for (type = 0; type < TYPE_ALL; type++) {
313  for (str = 0; str < cat->nb_streams[type]; str++) {
314  AVFilterPad pad = {
315  .type = type,
316  .config_props = config_output,
317  };
318  pad.name = av_asprintf("out:%c%d", "va"[type], str);
319  if ((ret = ff_insert_outpad(ctx, ctx->nb_outputs, &pad)) < 0) {
320  av_freep(&pad.name);
321  return ret;
322  }
323  }
324  }
325 
326  cat->in = av_calloc(ctx->nb_inputs, sizeof(*cat->in));
327  if (!cat->in)
328  return AVERROR(ENOMEM);
329  cat->nb_in_active = ctx->nb_outputs;
330  return 0;
331 }
332 
334 {
335  ConcatContext *cat = ctx->priv;
336  unsigned i;
337 
338  for (i = 0; i < ctx->nb_inputs; i++)
339  av_freep(&ctx->input_pads[i].name);
340  for (i = 0; i < ctx->nb_outputs; i++)
341  av_freep(&ctx->output_pads[i].name);
342  av_freep(&cat->in);
343 }
344 
346 {
347  ConcatContext *cat = ctx->priv;
348  AVFrame *frame;
349  unsigned i, j;
350  int ret, status;
351  int64_t pts;
352 
353  /* Forward status back */
354  for (i = 0; i < ctx->nb_outputs; i++) {
355  status = ff_outlink_get_status(ctx->outputs[i]);
356  if (!status)
357  continue;
358  for (j = i; j < ctx->nb_inputs; j += ctx->nb_outputs) {
359  if (!cat->in[j].eof) {
360  cat->in[j].eof = 1;
361  ff_inlink_set_status(ctx->inputs[j], status);
362  return 0;
363  }
364  }
365 
366  }
367 
368  /* Forward available frames */
369  if (cat->cur_idx < ctx->nb_inputs) {
370  for (i = 0; i < ctx->nb_outputs; i++) {
371  ret = ff_inlink_consume_frame(ctx->inputs[cat->cur_idx + i], &frame);
372  if (ret < 0)
373  return ret;
374  if (ret) {
375  ff_filter_set_ready(ctx, 10);
376  return push_frame(ctx, cat->cur_idx + i, frame);
377  }
378  }
379  }
380 
381  /* Forward status change */
382  if (cat->cur_idx < ctx->nb_inputs) {
383  for (i = 0; i < ctx->nb_outputs; i++) {
384  ret = ff_inlink_acknowledge_status(ctx->inputs[cat->cur_idx + i], &status, &pts);
385  /* TODO use pts */
386  if (ret > 0) {
387  close_input(ctx, cat->cur_idx + i);
388  if (cat->cur_idx + ctx->nb_outputs >= ctx->nb_inputs) {
389  ff_outlink_set_status(ctx->outputs[i], status, pts);
390  }
391  if (!cat->nb_in_active) {
392  ret = flush_segment(ctx);
393  if (ret < 0)
394  return ret;
395  }
396  ff_filter_set_ready(ctx, 10);
397  return 0;
398  }
399  }
400  }
401 
402  ret = FFERROR_NOT_READY;
403  for (i = 0; i < ctx->nb_outputs; i++) {
404  if (ff_outlink_frame_wanted(ctx->outputs[i])) {
405  if (cat->in[cat->cur_idx + i].eof) {
406  for (j = 0; j < ctx->nb_outputs; j++)
407  if (!cat->in[cat->cur_idx + j].eof)
408  ff_inlink_request_frame(ctx->inputs[cat->cur_idx + j]);
409  return 0;
410  } else {
411  ff_inlink_request_frame(ctx->inputs[cat->cur_idx + i]);
412  ret = 0;
413  }
414  }
415  }
416 
417  return ret;
418 }
419 
420 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
421  char *res, int res_len, int flags)
422 {
423  int ret = AVERROR(ENOSYS);
424 
425  if (!strcmp(cmd, "next")) {
426  av_log(ctx, AV_LOG_VERBOSE, "Command received: next\n");
427  return flush_segment(ctx);
428  }
429 
430  return ret;
431 }
432 
434  .name = "concat",
435  .description = NULL_IF_CONFIG_SMALL("Concatenate audio and video streams."),
436  .init = init,
437  .uninit = uninit,
438  .query_formats = query_formats,
439  .activate = activate,
440  .priv_size = sizeof(ConcatContext),
441  .inputs = NULL,
442  .outputs = NULL,
443  .priv_class = &concat_class,
446 };
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:1481
#define NULL
Definition: coverity.c:32
static AVFrame * get_audio_buffer(AVFilterLink *inlink, int nb_samples)
Definition: avf_concat.c:195
static int flush_segment(AVFilterContext *ctx)
Definition: avf_concat.c:261
static int send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no, int64_t seg_delta)
Definition: avf_concat.c:228
This structure describes decoded (raw) audio or video data.
Definition: frame.h:268
static av_cold int init(AVFilterContext *ctx)
Definition: avf_concat.c:288
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:1607
AVFilter ff_avf_concat
Definition: avf_concat.c:433
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:333
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:435
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1080
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:361
static AVFrame * get_video_buffer(AVFilterLink *inlink, int w, int h)
Definition: avf_concat.c:186
static int push_frame(AVFilterContext *ctx, unsigned in_no, AVFrame *buf)
Definition: avf_concat.c:161
#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:420
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:350
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:1436
static int activate(AVFilterContext *ctx)
Definition: avf_concat.c:345
AVFilterPad * input_pads
array of input pads
Definition: avfilter.h:345
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:260
#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:440
static void close_input(AVFilterContext *ctx, unsigned in_no)
Definition: avf_concat.c:204
uint8_t w
Definition: llviddspenc.c:38
static void find_next_delta_ts(AVFilterContext *ctx, int64_t *seg_delta)
Definition: avf_concat.c:214
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:401
#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:1630
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:1615
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:395
#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:315
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:334
static int ff_insert_inpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new input pad for the filter.
Definition: internal.h:277