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af_ladspa.c
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1 /*
2  * Copyright (c) 2013 Paul B Mahol
3  * Copyright (c) 2011 Mina Nagy Zaki
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * LADSPA wrapper
25  */
26 
27 #include <dlfcn.h>
28 #include <ladspa.h>
29 #include "libavutil/avstring.h"
31 #include "libavutil/opt.h"
32 #include "audio.h"
33 #include "avfilter.h"
34 #include "internal.h"
35 
36 typedef struct LADSPAContext {
37  const AVClass *class;
38  char *dl_name;
39  char *plugin;
40  char *options;
41  void *dl_handle;
42 
43  unsigned long nb_inputs;
44  unsigned long *ipmap; /* map input number to port number */
45 
46  unsigned long nb_inputcontrols;
47  unsigned long *icmap; /* map input control number to port number */
48  LADSPA_Data *ictlv; /* input controls values */
49 
50  unsigned long nb_outputs;
51  unsigned long *opmap; /* map output number to port number */
52 
53  unsigned long nb_outputcontrols;
54  unsigned long *ocmap; /* map output control number to port number */
55  LADSPA_Data *octlv; /* output controls values */
56 
57  const LADSPA_Descriptor *desc;
60  LADSPA_Handle *handles;
61 
64  int64_t pts;
65  int64_t duration;
67 
68 #define OFFSET(x) offsetof(LADSPAContext, x)
69 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
70 static const AVOption ladspa_options[] = {
71  { "file", "set library name or full path", OFFSET(dl_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
72  { "f", "set library name or full path", OFFSET(dl_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
73  { "plugin", "set plugin name", OFFSET(plugin), AV_OPT_TYPE_STRING, .flags = FLAGS },
74  { "p", "set plugin name", OFFSET(plugin), AV_OPT_TYPE_STRING, .flags = FLAGS },
75  { "controls", "set plugin options", OFFSET(options), AV_OPT_TYPE_STRING, .flags = FLAGS },
76  { "c", "set plugin options", OFFSET(options), AV_OPT_TYPE_STRING, .flags = FLAGS },
77  { "sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT32_MAX, FLAGS },
78  { "s", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT32_MAX, FLAGS },
79  { "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },
80  { "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },
81  { "duration", "set audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },
82  { "d", "set audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },
83  { NULL }
84 };
85 
86 AVFILTER_DEFINE_CLASS(ladspa);
87 
88 static void print_ctl_info(AVFilterContext *ctx, int level,
89  LADSPAContext *s, int ctl, unsigned long *map,
90  LADSPA_Data *values, int print)
91 {
92  const LADSPA_PortRangeHint *h = s->desc->PortRangeHints + map[ctl];
93 
94  av_log(ctx, level, "c%i: %s [", ctl, s->desc->PortNames[map[ctl]]);
95 
96  if (LADSPA_IS_HINT_TOGGLED(h->HintDescriptor)) {
97  av_log(ctx, level, "toggled (1 or 0)");
98 
99  if (LADSPA_IS_HINT_HAS_DEFAULT(h->HintDescriptor))
100  av_log(ctx, level, " (default %i)", (int)values[ctl]);
101  } else {
102  if (LADSPA_IS_HINT_INTEGER(h->HintDescriptor)) {
103  av_log(ctx, level, "<int>");
104 
105  if (LADSPA_IS_HINT_BOUNDED_BELOW(h->HintDescriptor))
106  av_log(ctx, level, ", min: %i", (int)h->LowerBound);
107 
108  if (LADSPA_IS_HINT_BOUNDED_ABOVE(h->HintDescriptor))
109  av_log(ctx, level, ", max: %i", (int)h->UpperBound);
110 
111  if (print)
112  av_log(ctx, level, " (value %d)", (int)values[ctl]);
113  else if (LADSPA_IS_HINT_HAS_DEFAULT(h->HintDescriptor))
114  av_log(ctx, level, " (default %d)", (int)values[ctl]);
115  } else {
116  av_log(ctx, level, "<float>");
117 
118  if (LADSPA_IS_HINT_BOUNDED_BELOW(h->HintDescriptor))
119  av_log(ctx, level, ", min: %f", h->LowerBound);
120 
121  if (LADSPA_IS_HINT_BOUNDED_ABOVE(h->HintDescriptor))
122  av_log(ctx, level, ", max: %f", h->UpperBound);
123 
124  if (print)
125  av_log(ctx, level, " (value %f)", values[ctl]);
126  else if (LADSPA_IS_HINT_HAS_DEFAULT(h->HintDescriptor))
127  av_log(ctx, level, " (default %f)", values[ctl]);
128  }
129 
130  if (LADSPA_IS_HINT_SAMPLE_RATE(h->HintDescriptor))
131  av_log(ctx, level, ", multiple of sample rate");
132 
133  if (LADSPA_IS_HINT_LOGARITHMIC(h->HintDescriptor))
134  av_log(ctx, level, ", logarithmic scale");
135  }
136 
137  av_log(ctx, level, "]\n");
138 }
139 
140 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
141 {
142  AVFilterContext *ctx = inlink->dst;
143  LADSPAContext *s = ctx->priv;
144  AVFrame *out;
145  int i, h;
146 
147  if (!s->nb_outputs ||
148  (av_frame_is_writable(in) && s->nb_inputs == s->nb_outputs &&
149  !(s->desc->Properties & LADSPA_PROPERTY_INPLACE_BROKEN))) {
150  out = in;
151  } else {
152  out = ff_get_audio_buffer(ctx->outputs[0], in->nb_samples);
153  if (!out) {
154  av_frame_free(&in);
155  return AVERROR(ENOMEM);
156  }
157  av_frame_copy_props(out, in);
158  }
159 
160  for (h = 0; h < s->nb_handles; h++) {
161  for (i = 0; i < s->nb_inputs; i++) {
162  s->desc->connect_port(s->handles[h], s->ipmap[i],
163  (LADSPA_Data*)in->extended_data[i]);
164  }
165 
166  for (i = 0; i < s->nb_outputs; i++) {
167  s->desc->connect_port(s->handles[h], s->opmap[i],
168  (LADSPA_Data*)out->extended_data[i]);
169  }
170 
171  s->desc->run(s->handles[h], in->nb_samples);
172  }
173 
174  for (i = 0; i < s->nb_outputcontrols; i++)
175  print_ctl_info(ctx, AV_LOG_VERBOSE, s, i, s->ocmap, s->octlv, 1);
176 
177  if (out != in)
178  av_frame_free(&in);
179 
180  return ff_filter_frame(ctx->outputs[0], out);
181 }
182 
183 static int request_frame(AVFilterLink *outlink)
184 {
185  AVFilterContext *ctx = outlink->src;
186  LADSPAContext *s = ctx->priv;
187  AVFrame *out;
188  int64_t t;
189  int i;
190 
191  if (ctx->nb_inputs)
192  return ff_request_frame(ctx->inputs[0]);
193 
194  t = av_rescale(s->pts, AV_TIME_BASE, s->sample_rate);
195  if (s->duration >= 0 && t >= s->duration)
196  return AVERROR_EOF;
197 
198  out = ff_get_audio_buffer(outlink, s->nb_samples);
199  if (!out)
200  return AVERROR(ENOMEM);
201 
202  for (i = 0; i < s->nb_outputs; i++)
203  s->desc->connect_port(s->handles[0], s->opmap[i],
204  (LADSPA_Data*)out->extended_data[i]);
205 
206  s->desc->run(s->handles[0], s->nb_samples);
207 
208  for (i = 0; i < s->nb_outputcontrols; i++)
209  print_ctl_info(ctx, AV_LOG_INFO, s, i, s->ocmap, s->octlv, 1);
210 
211  out->sample_rate = s->sample_rate;
212  out->pts = s->pts;
213  s->pts += s->nb_samples;
214 
215  return ff_filter_frame(outlink, out);
216 }
217 
218 static void set_default_ctl_value(LADSPAContext *s, int ctl,
219  unsigned long *map, LADSPA_Data *values)
220 {
221  const LADSPA_PortRangeHint *h = s->desc->PortRangeHints + map[ctl];
222  const LADSPA_Data lower = h->LowerBound;
223  const LADSPA_Data upper = h->UpperBound;
224 
225  if (LADSPA_IS_HINT_DEFAULT_MINIMUM(h->HintDescriptor)) {
226  values[ctl] = lower;
227  } else if (LADSPA_IS_HINT_DEFAULT_MAXIMUM(h->HintDescriptor)) {
228  values[ctl] = upper;
229  } else if (LADSPA_IS_HINT_DEFAULT_0(h->HintDescriptor)) {
230  values[ctl] = 0.0;
231  } else if (LADSPA_IS_HINT_DEFAULT_1(h->HintDescriptor)) {
232  values[ctl] = 1.0;
233  } else if (LADSPA_IS_HINT_DEFAULT_100(h->HintDescriptor)) {
234  values[ctl] = 100.0;
235  } else if (LADSPA_IS_HINT_DEFAULT_440(h->HintDescriptor)) {
236  values[ctl] = 440.0;
237  } else if (LADSPA_IS_HINT_DEFAULT_LOW(h->HintDescriptor)) {
238  if (LADSPA_IS_HINT_LOGARITHMIC(h->HintDescriptor))
239  values[ctl] = exp(log(lower) * 0.75 + log(upper) * 0.25);
240  else
241  values[ctl] = lower * 0.75 + upper * 0.25;
242  } else if (LADSPA_IS_HINT_DEFAULT_MIDDLE(h->HintDescriptor)) {
243  if (LADSPA_IS_HINT_LOGARITHMIC(h->HintDescriptor))
244  values[ctl] = exp(log(lower) * 0.5 + log(upper) * 0.5);
245  else
246  values[ctl] = lower * 0.5 + upper * 0.5;
247  } else if (LADSPA_IS_HINT_DEFAULT_HIGH(h->HintDescriptor)) {
248  if (LADSPA_IS_HINT_LOGARITHMIC(h->HintDescriptor))
249  values[ctl] = exp(log(lower) * 0.25 + log(upper) * 0.75);
250  else
251  values[ctl] = lower * 0.25 + upper * 0.75;
252  }
253 }
254 
256 {
257  LADSPAContext *s = ctx->priv;
258  int i, j;
259 
260  s->nb_handles = s->nb_inputs == 1 && s->nb_outputs == 1 ? link->channels : 1;
261  s->handles = av_calloc(s->nb_handles, sizeof(*s->handles));
262  if (!s->handles)
263  return AVERROR(ENOMEM);
264 
265  for (i = 0; i < s->nb_handles; i++) {
266  s->handles[i] = s->desc->instantiate(s->desc, link->sample_rate);
267  if (!s->handles[i]) {
268  av_log(ctx, AV_LOG_ERROR, "Could not instantiate plugin.\n");
269  return AVERROR_EXTERNAL;
270  }
271 
272  // Connect the input control ports
273  for (j = 0; j < s->nb_inputcontrols; j++)
274  s->desc->connect_port(s->handles[i], s->icmap[j], s->ictlv + j);
275 
276  // Connect the output control ports
277  for (j = 0; j < s->nb_outputcontrols; j++)
278  s->desc->connect_port(s->handles[i], s->ocmap[j], &s->octlv[j]);
279 
280  if (s->desc->activate)
281  s->desc->activate(s->handles[i]);
282  }
283 
284  av_log(ctx, AV_LOG_DEBUG, "handles: %d\n", s->nb_handles);
285 
286  return 0;
287 }
288 
289 static int config_input(AVFilterLink *inlink)
290 {
291  AVFilterContext *ctx = inlink->dst;
292 
293  return connect_ports(ctx, inlink);
294 }
295 
296 static int config_output(AVFilterLink *outlink)
297 {
298  AVFilterContext *ctx = outlink->src;
299  int ret;
300 
301  if (ctx->nb_inputs) {
302  AVFilterLink *inlink = ctx->inputs[0];
303 
304  outlink->format = inlink->format;
305  outlink->sample_rate = inlink->sample_rate;
306 
307  ret = 0;
308  } else {
309  LADSPAContext *s = ctx->priv;
310 
311  outlink->sample_rate = s->sample_rate;
312  outlink->time_base = (AVRational){1, s->sample_rate};
313 
314  ret = connect_ports(ctx, outlink);
315  }
316 
317  return ret;
318 }
319 
320 static void count_ports(const LADSPA_Descriptor *desc,
321  unsigned long *nb_inputs, unsigned long *nb_outputs)
322 {
323  LADSPA_PortDescriptor pd;
324  int i;
325 
326  for (i = 0; i < desc->PortCount; i++) {
327  pd = desc->PortDescriptors[i];
328 
329  if (LADSPA_IS_PORT_AUDIO(pd)) {
330  if (LADSPA_IS_PORT_INPUT(pd)) {
331  (*nb_inputs)++;
332  } else if (LADSPA_IS_PORT_OUTPUT(pd)) {
333  (*nb_outputs)++;
334  }
335  }
336  }
337 }
338 
339 static void *try_load(const char *dir, const char *soname)
340 {
341  char *path = av_asprintf("%s/%s.so", dir, soname);
342  void *ret = NULL;
343 
344  if (path) {
345  ret = dlopen(path, RTLD_LOCAL|RTLD_NOW);
346  av_free(path);
347  }
348 
349  return ret;
350 }
351 
352 static int set_control(AVFilterContext *ctx, unsigned long port, LADSPA_Data value)
353 {
354  LADSPAContext *s = ctx->priv;
355  const char *label = s->desc->Label;
356  LADSPA_PortRangeHint *h = (LADSPA_PortRangeHint *)s->desc->PortRangeHints +
357  s->icmap[port];
358 
359  if (port >= s->nb_inputcontrols) {
360  av_log(ctx, AV_LOG_ERROR, "Control c%ld is out of range [0 - %lu].\n",
361  port, s->nb_inputcontrols);
362  return AVERROR(EINVAL);
363  }
364 
365  if (LADSPA_IS_HINT_BOUNDED_BELOW(h->HintDescriptor) &&
366  value < h->LowerBound) {
367  av_log(ctx, AV_LOG_ERROR,
368  "%s: input control c%ld is below lower boundary of %0.4f.\n",
369  label, port, h->LowerBound);
370  return AVERROR(EINVAL);
371  }
372 
373  if (LADSPA_IS_HINT_BOUNDED_ABOVE(h->HintDescriptor) &&
374  value > h->UpperBound) {
375  av_log(ctx, AV_LOG_ERROR,
376  "%s: input control c%ld is above upper boundary of %0.4f.\n",
377  label, port, h->UpperBound);
378  return AVERROR(EINVAL);
379  }
380 
381  s->ictlv[port] = value;
382 
383  return 0;
384 }
385 
386 static av_cold int init(AVFilterContext *ctx)
387 {
388  LADSPAContext *s = ctx->priv;
389  LADSPA_Descriptor_Function descriptor_fn;
390  const LADSPA_Descriptor *desc;
391  LADSPA_PortDescriptor pd;
392  AVFilterPad pad = { NULL };
393  char *p, *arg, *saveptr = NULL;
394  unsigned long nb_ports;
395  int i;
396 
397  if (!s->dl_name) {
398  av_log(ctx, AV_LOG_ERROR, "No plugin name provided\n");
399  return AVERROR(EINVAL);
400  }
401 
402  if (s->dl_name[0] == '/' || s->dl_name[0] == '.') {
403  // argument is a path
404  s->dl_handle = dlopen(s->dl_name, RTLD_LOCAL|RTLD_NOW);
405  } else {
406  // argument is a shared object name
407  char *paths = av_strdup(getenv("LADSPA_PATH"));
408  const char *separator = ":";
409 
410  if (paths) {
411  p = paths;
412  while ((arg = av_strtok(p, separator, &saveptr)) && !s->dl_handle) {
413  s->dl_handle = try_load(arg, s->dl_name);
414  p = NULL;
415  }
416  }
417 
418  av_free(paths);
419  if (!s->dl_handle && (paths = av_asprintf("%s/.ladspa/lib", getenv("HOME")))) {
420  s->dl_handle = try_load(paths, s->dl_name);
421  av_free(paths);
422  }
423 
424  if (!s->dl_handle)
425  s->dl_handle = try_load("/usr/local/lib/ladspa", s->dl_name);
426 
427  if (!s->dl_handle)
428  s->dl_handle = try_load("/usr/lib/ladspa", s->dl_name);
429  }
430  if (!s->dl_handle) {
431  av_log(ctx, AV_LOG_ERROR, "Failed to load '%s'\n", s->dl_name);
432  return AVERROR(EINVAL);
433  }
434 
435  descriptor_fn = dlsym(s->dl_handle, "ladspa_descriptor");
436  if (!descriptor_fn) {
437  av_log(ctx, AV_LOG_ERROR, "Could not find ladspa_descriptor: %s\n", dlerror());
438  return AVERROR(EINVAL);
439  }
440 
441  // Find the requested plugin, or list plugins
442  if (!s->plugin) {
443  av_log(ctx, AV_LOG_INFO, "The '%s' library contains the following plugins:\n", s->dl_name);
444  av_log(ctx, AV_LOG_INFO, "I = Input Channels\n");
445  av_log(ctx, AV_LOG_INFO, "O = Output Channels\n");
446  av_log(ctx, AV_LOG_INFO, "I:O %-25s %s\n", "Plugin", "Description");
447  av_log(ctx, AV_LOG_INFO, "\n");
448  for (i = 0; desc = descriptor_fn(i); i++) {
449  unsigned long inputs = 0, outputs = 0;
450 
451  count_ports(desc, &inputs, &outputs);
452  av_log(ctx, AV_LOG_INFO, "%lu:%lu %-25s %s\n", inputs, outputs, desc->Label,
453  (char *)av_x_if_null(desc->Name, "?"));
454  av_log(ctx, AV_LOG_VERBOSE, "Maker: %s\n",
455  (char *)av_x_if_null(desc->Maker, "?"));
456  av_log(ctx, AV_LOG_VERBOSE, "Copyright: %s\n",
457  (char *)av_x_if_null(desc->Copyright, "?"));
458  }
459  return AVERROR_EXIT;
460  } else {
461  for (i = 0;; i++) {
462  desc = descriptor_fn(i);
463  if (!desc) {
464  av_log(ctx, AV_LOG_ERROR, "Could not find plugin: %s\n", s->plugin);
465  return AVERROR(EINVAL);
466  }
467 
468  if (desc->Label && !strcmp(desc->Label, s->plugin))
469  break;
470  }
471  }
472 
473  s->desc = desc;
474  nb_ports = desc->PortCount;
475 
476  s->ipmap = av_calloc(nb_ports, sizeof(*s->ipmap));
477  s->opmap = av_calloc(nb_ports, sizeof(*s->opmap));
478  s->icmap = av_calloc(nb_ports, sizeof(*s->icmap));
479  s->ocmap = av_calloc(nb_ports, sizeof(*s->ocmap));
480  s->ictlv = av_calloc(nb_ports, sizeof(*s->ictlv));
481  s->octlv = av_calloc(nb_ports, sizeof(*s->octlv));
482  s->ctl_needs_value = av_calloc(nb_ports, sizeof(*s->ctl_needs_value));
483  if (!s->ipmap || !s->opmap || !s->icmap ||
484  !s->ocmap || !s->ictlv || !s->octlv || !s->ctl_needs_value)
485  return AVERROR(ENOMEM);
486 
487  for (i = 0; i < nb_ports; i++) {
488  pd = desc->PortDescriptors[i];
489 
490  if (LADSPA_IS_PORT_AUDIO(pd)) {
491  if (LADSPA_IS_PORT_INPUT(pd)) {
492  s->ipmap[s->nb_inputs] = i;
493  s->nb_inputs++;
494  } else if (LADSPA_IS_PORT_OUTPUT(pd)) {
495  s->opmap[s->nb_outputs] = i;
496  s->nb_outputs++;
497  }
498  } else if (LADSPA_IS_PORT_CONTROL(pd)) {
499  if (LADSPA_IS_PORT_INPUT(pd)) {
500  s->icmap[s->nb_inputcontrols] = i;
501 
502  if (LADSPA_IS_HINT_HAS_DEFAULT(desc->PortRangeHints[i].HintDescriptor))
504  else
506 
507  s->nb_inputcontrols++;
508  } else if (LADSPA_IS_PORT_OUTPUT(pd)) {
509  s->ocmap[s->nb_outputcontrols] = i;
510  s->nb_outputcontrols++;
511  }
512  }
513  }
514 
515  // List Control Ports if "help" is specified
516  if (s->options && !strcmp(s->options, "help")) {
517  if (!s->nb_inputcontrols) {
518  av_log(ctx, AV_LOG_INFO,
519  "The '%s' plugin does not have any input controls.\n",
520  desc->Label);
521  } else {
522  av_log(ctx, AV_LOG_INFO,
523  "The '%s' plugin has the following input controls:\n",
524  desc->Label);
525  for (i = 0; i < s->nb_inputcontrols; i++)
526  print_ctl_info(ctx, AV_LOG_INFO, s, i, s->icmap, s->ictlv, 0);
527  }
528  return AVERROR_EXIT;
529  }
530 
531  // Parse control parameters
532  p = s->options;
533  while (s->options) {
534  LADSPA_Data val;
535  int ret;
536 
537  if (!(arg = av_strtok(p, "|", &saveptr)))
538  break;
539  p = NULL;
540 
541  if (sscanf(arg, "c%d=%f", &i, &val) != 2) {
542  av_log(ctx, AV_LOG_ERROR, "Invalid syntax.\n");
543  return AVERROR(EINVAL);
544  }
545 
546  if ((ret = set_control(ctx, i, val)) < 0)
547  return ret;
548  s->ctl_needs_value[i] = 0;
549  }
550 
551  // Check if any controls are not set
552  for (i = 0; i < s->nb_inputcontrols; i++) {
553  if (s->ctl_needs_value[i]) {
554  av_log(ctx, AV_LOG_ERROR, "Control c%d must be set.\n", i);
555  print_ctl_info(ctx, AV_LOG_ERROR, s, i, s->icmap, s->ictlv, 0);
556  return AVERROR(EINVAL);
557  }
558  }
559 
560  pad.type = AVMEDIA_TYPE_AUDIO;
561 
562  if (s->nb_inputs) {
563  pad.name = av_asprintf("in0:%s%lu", desc->Label, s->nb_inputs);
564  if (!pad.name)
565  return AVERROR(ENOMEM);
566 
569  if (ff_insert_inpad(ctx, ctx->nb_inputs, &pad) < 0) {
570  av_freep(&pad.name);
571  return AVERROR(ENOMEM);
572  }
573  }
574 
575  av_log(ctx, AV_LOG_DEBUG, "ports: %lu\n", nb_ports);
576  av_log(ctx, AV_LOG_DEBUG, "inputs: %lu outputs: %lu\n",
577  s->nb_inputs, s->nb_outputs);
578  av_log(ctx, AV_LOG_DEBUG, "input controls: %lu output controls: %lu\n",
580 
581  return 0;
582 }
583 
585 {
586  LADSPAContext *s = ctx->priv;
589  static const enum AVSampleFormat sample_fmts[] = {
591 
592  formats = ff_make_format_list(sample_fmts);
593  if (!formats)
594  return AVERROR(ENOMEM);
595  ff_set_common_formats(ctx, formats);
596 
597  if (s->nb_inputs) {
598  formats = ff_all_samplerates();
599  if (!formats)
600  return AVERROR(ENOMEM);
601 
602  ff_set_common_samplerates(ctx, formats);
603  } else {
604  int sample_rates[] = { s->sample_rate, -1 };
605 
607  }
608 
609  if (s->nb_inputs == 1 && s->nb_outputs == 1) {
610  // We will instantiate multiple LADSPA_Handle, one over each channel
611  layouts = ff_all_channel_layouts();
612  if (!layouts)
613  return AVERROR(ENOMEM);
614 
615  ff_set_common_channel_layouts(ctx, layouts);
616  } else {
617  AVFilterLink *outlink = ctx->outputs[0];
618 
619  if (s->nb_inputs >= 1) {
620  AVFilterLink *inlink = ctx->inputs[0];
621  int64_t inlayout = FF_COUNT2LAYOUT(s->nb_inputs);
622 
623  layouts = NULL;
624  ff_add_channel_layout(&layouts, inlayout);
625  ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
626 
627  if (!s->nb_outputs)
628  ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts);
629  }
630 
631  if (s->nb_outputs >= 1) {
632  int64_t outlayout = FF_COUNT2LAYOUT(s->nb_outputs);
633 
634  layouts = NULL;
635  ff_add_channel_layout(&layouts, outlayout);
636  ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts);
637  }
638  }
639 
640  return 0;
641 }
642 
643 static av_cold void uninit(AVFilterContext *ctx)
644 {
645  LADSPAContext *s = ctx->priv;
646  int i;
647 
648  for (i = 0; i < s->nb_handles; i++) {
649  if (s->desc->deactivate)
650  s->desc->deactivate(s->handles[i]);
651  if (s->desc->cleanup)
652  s->desc->cleanup(s->handles[i]);
653  }
654 
655  if (s->dl_handle)
656  dlclose(s->dl_handle);
657 
658  av_freep(&s->ipmap);
659  av_freep(&s->opmap);
660  av_freep(&s->icmap);
661  av_freep(&s->ocmap);
662  av_freep(&s->ictlv);
663  av_freep(&s->octlv);
664  av_freep(&s->handles);
666 
667  if (ctx->nb_inputs)
668  av_freep(&ctx->input_pads[0].name);
669 }
670 
671 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
672  char *res, int res_len, int flags)
673 {
674  LADSPA_Data value;
675  unsigned long port;
676 
677  if (sscanf(cmd, "c%ld", &port) + sscanf(args, "%f", &value) != 2)
678  return AVERROR(EINVAL);
679 
680  return set_control(ctx, port, value);
681 }
682 
683 static const AVFilterPad ladspa_outputs[] = {
684  {
685  .name = "default",
686  .type = AVMEDIA_TYPE_AUDIO,
687  .config_props = config_output,
688  .request_frame = request_frame,
689  },
690  { NULL }
691 };
692 
694  .name = "ladspa",
695  .description = NULL_IF_CONFIG_SMALL("Apply LADSPA effect."),
696  .priv_size = sizeof(LADSPAContext),
697  .priv_class = &ladspa_class,
698  .init = init,
699  .uninit = uninit,
702  .inputs = 0,
703  .outputs = ladspa_outputs,
705 };