FFmpeg
aeval.c
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1 /*
2  * Copyright (c) 2011 Stefano Sabatini
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  * eval audio source
24  */
25 
26 #include "libavutil/avassert.h"
27 #include "libavutil/avstring.h"
29 #include "libavutil/eval.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/parseutils.h"
32 #include "avfilter.h"
33 #include "audio.h"
34 #include "internal.h"
35 
36 static const char * const var_names[] = {
37  "ch", ///< the value of the current channel
38  "n", ///< number of frame
39  "nb_in_channels",
40  "nb_out_channels",
41  "t", ///< timestamp expressed in seconds
42  "s", ///< sample rate
43  NULL
44 };
45 
46 enum var_name {
54 };
55 
56 typedef struct EvalContext {
57  const AVClass *class;
60  int64_t chlayout;
61  char *chlayout_str;
62  int nb_channels; ///< number of output channels
63  int nb_in_channels; ///< number of input channels
64  int same_chlayout; ///< set output as input channel layout
65  int64_t pts;
67  char *exprs;
68  int nb_samples; ///< number of samples per requested frame
69  int64_t duration;
70  uint64_t n;
72  double *channel_values;
74 } EvalContext;
75 
76 static double val(void *priv, double ch)
77 {
78  EvalContext *eval = priv;
79  return eval->channel_values[FFMIN((int)ch, eval->nb_in_channels-1)];
80 }
81 
82 static double (* const aeval_func1[])(void *, double) = { val, NULL };
83 static const char * const aeval_func1_names[] = { "val", NULL };
84 
85 #define OFFSET(x) offsetof(EvalContext, x)
86 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
87 
88 static const AVOption aevalsrc_options[]= {
89  { "exprs", "set the '|'-separated list of channels expressions", OFFSET(exprs), AV_OPT_TYPE_STRING, {.str = NULL}, .flags = FLAGS },
90  { "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_MAX, FLAGS },
91  { "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_MAX, FLAGS },
92  { "sample_rate", "set the sample rate", OFFSET(sample_rate_str), AV_OPT_TYPE_STRING, {.str = "44100"}, 0, 0, FLAGS },
93  { "s", "set the sample rate", OFFSET(sample_rate_str), AV_OPT_TYPE_STRING, {.str = "44100"}, 0, 0, FLAGS },
94  { "duration", "set audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = -1}, -1, INT64_MAX, FLAGS },
95  { "d", "set audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = -1}, -1, INT64_MAX, FLAGS },
96  { "channel_layout", "set channel layout", OFFSET(chlayout_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
97  { "c", "set channel layout", OFFSET(chlayout_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
98  { NULL }
99 };
100 
101 AVFILTER_DEFINE_CLASS(aevalsrc);
102 
104  int expected_nb_channels)
105 {
106  EvalContext *eval = ctx->priv;
107  char *args1 = av_strdup(eval->exprs);
108  char *expr, *last_expr = NULL, *buf;
109  double (* const *func1)(void *, double) = NULL;
110  const char * const *func1_names = NULL;
111  int i, ret = 0;
112 
113  if (!args1)
114  return AVERROR(ENOMEM);
115 
116  if (!eval->exprs) {
117  av_log(ctx, AV_LOG_ERROR, "Channels expressions list is empty\n");
118  return AVERROR(EINVAL);
119  }
120 
121  if (!strcmp(ctx->filter->name, "aeval")) {
122  func1 = aeval_func1;
124  }
125 
126 #define ADD_EXPRESSION(expr_) do { \
127  if (!av_dynarray2_add((void **)&eval->expr, &eval->nb_channels, \
128  sizeof(*eval->expr), NULL)) { \
129  ret = AVERROR(ENOMEM); \
130  goto end; \
131  } \
132  eval->expr[eval->nb_channels-1] = NULL; \
133  ret = av_expr_parse(&eval->expr[eval->nb_channels - 1], expr_, \
134  var_names, func1_names, func1, \
135  NULL, NULL, 0, ctx); \
136  if (ret < 0) \
137  goto end; \
138  } while (0)
139 
140  /* reset expressions */
141  for (i = 0; i < eval->nb_channels; i++) {
142  av_expr_free(eval->expr[i]);
143  eval->expr[i] = NULL;
144  }
145  av_freep(&eval->expr);
146  eval->nb_channels = 0;
147 
148  buf = args1;
149  while (expr = av_strtok(buf, "|", &buf)) {
150  ADD_EXPRESSION(expr);
151  last_expr = expr;
152  }
153 
154  if (expected_nb_channels > eval->nb_channels)
155  for (i = eval->nb_channels; i < expected_nb_channels; i++)
156  ADD_EXPRESSION(last_expr);
157 
158  if (expected_nb_channels > 0 && eval->nb_channels != expected_nb_channels) {
160  "Mismatch between the specified number of channel expressions '%d' "
161  "and the number of expected output channels '%d' for the specified channel layout\n",
162  eval->nb_channels, expected_nb_channels);
163  ret = AVERROR(EINVAL);
164  goto end;
165  }
166 
167 end:
168  av_free(args1);
169  return ret;
170 }
171 
173 {
174  EvalContext *eval = ctx->priv;
175  int ret = 0;
176 
177  if (eval->chlayout_str) {
178  if (!strcmp(eval->chlayout_str, "same") && !strcmp(ctx->filter->name, "aeval")) {
179  eval->same_chlayout = 1;
180  } else {
182  if (ret < 0)
183  return ret;
184 
186  if (ret < 0)
187  return ret;
188  }
189  } else {
190  /* guess channel layout from nb expressions/channels */
191  if ((ret = parse_channel_expressions(ctx, -1)) < 0)
192  return ret;
193 
195  if (!eval->chlayout && eval->nb_channels <= 0) {
196  av_log(ctx, AV_LOG_ERROR, "Invalid number of channels '%d' provided\n",
197  eval->nb_channels);
198  return AVERROR(EINVAL);
199  }
200  }
201 
202  if (eval->sample_rate_str)
203  if ((ret = ff_parse_sample_rate(&eval->sample_rate, eval->sample_rate_str, ctx)))
204  return ret;
205  eval->n = 0;
206 
207  return ret;
208 }
209 
211 {
212  EvalContext *eval = ctx->priv;
213  int i;
214 
215  for (i = 0; i < eval->nb_channels; i++) {
216  av_expr_free(eval->expr[i]);
217  eval->expr[i] = NULL;
218  }
219  av_freep(&eval->expr);
220  av_freep(&eval->channel_values);
221 }
222 
223 static int config_props(AVFilterLink *outlink)
224 {
225  EvalContext *eval = outlink->src->priv;
226  char buf[128];
227 
228  outlink->time_base = (AVRational){1, eval->sample_rate};
229  outlink->sample_rate = eval->sample_rate;
230 
231  eval->var_values[VAR_S] = eval->sample_rate;
233  eval->var_values[VAR_NB_OUT_CHANNELS] = outlink->channels;
234 
235  av_get_channel_layout_string(buf, sizeof(buf), 0, eval->chlayout);
236 
237  av_log(outlink->src, AV_LOG_VERBOSE,
238  "sample_rate:%d chlayout:%s duration:%"PRId64"\n",
239  eval->sample_rate, buf, eval->duration);
240 
241  return 0;
242 }
243 
245 {
246  EvalContext *eval = ctx->priv;
248  int64_t chlayouts[] = { eval->chlayout ? eval->chlayout : FF_COUNT2LAYOUT(eval->nb_channels) , -1 };
249  int sample_rates[] = { eval->sample_rate, -1 };
252  int ret;
253 
255  if (!formats)
256  return AVERROR(ENOMEM);
258  if (ret < 0)
259  return ret;
260 
261  layouts = ff_make_format64_list(chlayouts);
262  if (!layouts)
263  return AVERROR(ENOMEM);
265  if (ret < 0)
266  return ret;
267 
269  if (!formats)
270  return AVERROR(ENOMEM);
272 }
273 
274 static int request_frame(AVFilterLink *outlink)
275 {
276  EvalContext *eval = outlink->src->priv;
277  AVFrame *samplesref;
278  int i, j;
279  int64_t t = av_rescale(eval->n, AV_TIME_BASE, eval->sample_rate);
280  int nb_samples;
281 
282  if (eval->duration >= 0 && t >= eval->duration)
283  return AVERROR_EOF;
284 
285  if (eval->duration >= 0) {
286  nb_samples = FFMIN(eval->nb_samples, av_rescale(eval->duration, eval->sample_rate, AV_TIME_BASE) - eval->pts);
287  if (!nb_samples)
288  return AVERROR_EOF;
289  } else {
290  nb_samples = eval->nb_samples;
291  }
292  samplesref = ff_get_audio_buffer(outlink, nb_samples);
293  if (!samplesref)
294  return AVERROR(ENOMEM);
295 
296  /* evaluate expression for each single sample and for each channel */
297  for (i = 0; i < nb_samples; i++, eval->n++) {
298  eval->var_values[VAR_N] = eval->n;
299  eval->var_values[VAR_T] = eval->var_values[VAR_N] * (double)1/eval->sample_rate;
300 
301  for (j = 0; j < eval->nb_channels; j++) {
302  *((double *) samplesref->extended_data[j] + i) =
303  av_expr_eval(eval->expr[j], eval->var_values, NULL);
304  }
305  }
306 
307  samplesref->pts = eval->pts;
308  samplesref->sample_rate = eval->sample_rate;
309  eval->pts += nb_samples;
310 
311  return ff_filter_frame(outlink, samplesref);
312 }
313 
314 #if CONFIG_AEVALSRC_FILTER
315 static const AVFilterPad aevalsrc_outputs[] = {
316  {
317  .name = "default",
318  .type = AVMEDIA_TYPE_AUDIO,
319  .config_props = config_props,
320  .request_frame = request_frame,
321  },
322  { NULL }
323 };
324 
325 const AVFilter ff_asrc_aevalsrc = {
326  .name = "aevalsrc",
327  .description = NULL_IF_CONFIG_SMALL("Generate an audio signal generated by an expression."),
328  .query_formats = query_formats,
329  .init = init,
330  .uninit = uninit,
331  .priv_size = sizeof(EvalContext),
332  .inputs = NULL,
333  .outputs = aevalsrc_outputs,
334  .priv_class = &aevalsrc_class,
335 };
336 
337 #endif /* CONFIG_AEVALSRC_FILTER */
338 
339 #define OFFSET(x) offsetof(EvalContext, x)
340 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
341 
342 static const AVOption aeval_options[]= {
343  { "exprs", "set the '|'-separated list of channels expressions", OFFSET(exprs), AV_OPT_TYPE_STRING, {.str = NULL}, .flags = FLAGS },
344  { "channel_layout", "set channel layout", OFFSET(chlayout_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
345  { "c", "set channel layout", OFFSET(chlayout_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
346  { NULL }
347 };
348 
349 AVFILTER_DEFINE_CLASS(aeval);
350 
352 {
355  AVFilterLink *inlink = ctx->inputs[0];
356  AVFilterLink *outlink = ctx->outputs[0];
357  EvalContext *eval = ctx->priv;
358  static const enum AVSampleFormat sample_fmts[] = {
360  };
361  int ret;
362 
363  // inlink supports any channel layout
365  if ((ret = ff_channel_layouts_ref(layouts, &inlink->outcfg.channel_layouts)) < 0)
366  return ret;
367 
368  if (eval->same_chlayout) {
371  return ret;
372  } else {
373  // outlink supports only requested output channel layout
374  layouts = NULL;
376  eval->out_channel_layout ? eval->out_channel_layout :
377  FF_COUNT2LAYOUT(eval->nb_channels))) < 0)
378  return ret;
379  if ((ret = ff_channel_layouts_ref(layouts, &outlink->incfg.channel_layouts)) < 0)
380  return ret;
381  }
382 
384  if ((ret = ff_set_common_formats(ctx, formats)) < 0)
385  return ret;
386 
389 }
390 
391 static int aeval_config_output(AVFilterLink *outlink)
392 {
393  AVFilterContext *ctx = outlink->src;
394  EvalContext *eval = ctx->priv;
395  AVFilterLink *inlink = ctx->inputs[0];
396  int ret;
397 
398  if (eval->same_chlayout) {
399  eval->chlayout = inlink->channel_layout;
400 
401  if ((ret = parse_channel_expressions(ctx, inlink->channels)) < 0)
402  return ret;
403  }
404 
405  eval->n = 0;
406  eval->nb_in_channels = eval->var_values[VAR_NB_IN_CHANNELS] = inlink->channels;
407  eval->var_values[VAR_NB_OUT_CHANNELS] = outlink->channels;
408  eval->var_values[VAR_S] = inlink->sample_rate;
409  eval->var_values[VAR_T] = NAN;
410 
412  inlink->channels, sizeof(*eval->channel_values));
413  if (!eval->channel_values)
414  return AVERROR(ENOMEM);
415 
416  return 0;
417 }
418 
420 {
421  EvalContext *eval = inlink->dst->priv;
422  AVFilterLink *outlink = inlink->dst->outputs[0];
423  int nb_samples = in->nb_samples;
424  AVFrame *out;
425  double t0;
426  int i, j;
427 
428  out = ff_get_audio_buffer(outlink, nb_samples);
429  if (!out) {
430  av_frame_free(&in);
431  return AVERROR(ENOMEM);
432  }
434 
435  t0 = TS2T(in->pts, inlink->time_base);
436 
437  /* evaluate expression for each single sample and for each channel */
438  for (i = 0; i < nb_samples; i++, eval->n++) {
439  eval->var_values[VAR_N] = eval->n;
440  eval->var_values[VAR_T] = t0 + i * (double)1/inlink->sample_rate;
441 
442  for (j = 0; j < inlink->channels; j++)
443  eval->channel_values[j] = *((double *) in->extended_data[j] + i);
444 
445  for (j = 0; j < outlink->channels; j++) {
446  eval->var_values[VAR_CH] = j;
447  *((double *) out->extended_data[j] + i) =
448  av_expr_eval(eval->expr[j], eval->var_values, eval);
449  }
450  }
451 
452  av_frame_free(&in);
453  return ff_filter_frame(outlink, out);
454 }
455 
456 #if CONFIG_AEVAL_FILTER
457 
458 static const AVFilterPad aeval_inputs[] = {
459  {
460  .name = "default",
461  .type = AVMEDIA_TYPE_AUDIO,
462  .filter_frame = filter_frame,
463  },
464  { NULL }
465 };
466 
467 static const AVFilterPad aeval_outputs[] = {
468  {
469  .name = "default",
470  .type = AVMEDIA_TYPE_AUDIO,
471  .config_props = aeval_config_output,
472  },
473  { NULL }
474 };
475 
476 const AVFilter ff_af_aeval = {
477  .name = "aeval",
478  .description = NULL_IF_CONFIG_SMALL("Filter audio signal according to a specified expression."),
479  .query_formats = aeval_query_formats,
480  .init = init,
481  .uninit = uninit,
482  .priv_size = sizeof(EvalContext),
483  .inputs = aeval_inputs,
484  .outputs = aeval_outputs,
485  .priv_class = &aeval_class,
487 };
488 
489 #endif /* CONFIG_AEVAL_FILTER */
EvalContext::expr
AVExpr ** expr
Definition: aeval.c:66
formats
formats
Definition: signature.h:48
EvalContext::out_channel_layout
int64_t out_channel_layout
Definition: aeval.c:73
ff_get_audio_buffer
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
AVFilterChannelLayouts
A list of supported channel layouts.
Definition: formats.h:86
AVERROR
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
opt.h
ff_make_format_list
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:286
AVFilterFormatsConfig::channel_layouts
AVFilterChannelLayouts * channel_layouts
Lists of supported channel layouts, only for audio.
Definition: avfilter.h:447
out
FILE * out
Definition: movenc.c:54
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:978
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:953
ff_channel_layouts_ref
int ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
Add *ref as a new reference to f.
Definition: formats.c:454
layouts
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
EvalContext::duration
int64_t duration
Definition: aeval.c:69
inlink
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
Definition: filter_design.txt:212
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:111
ff_all_channel_counts
AVFilterChannelLayouts * ff_all_channel_counts(void)
Construct an AVFilterChannelLayouts coding for any channel layout, with known or unknown disposition.
Definition: formats.c:429
init
static av_cold int init(AVFilterContext *ctx)
Definition: aeval.c:172
aeval_query_formats
static int aeval_query_formats(AVFilterContext *ctx)
Definition: aeval.c:351
av_get_channel_layout_string
void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout)
Return a description of a channel layout.
Definition: channel_layout.c:217
ff_make_format64_list
AVFilterChannelLayouts * ff_make_format64_list(const int64_t *fmts)
Definition: formats.c:295
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:396
ADD_EXPRESSION
#define ADD_EXPRESSION(expr_)
AVOption
AVOption.
Definition: opt.h:248
t0
#define t0
Definition: regdef.h:28
FLAGS
#define FLAGS
Definition: aeval.c:340
AV_OPT_TYPE_DURATION
@ AV_OPT_TYPE_DURATION
Definition: opt.h:239
aeval_func1_names
static const char *const aeval_func1_names[]
Definition: aeval.c:83
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:197
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:149
config_props
static int config_props(AVFilterLink *outlink)
Definition: aeval.c:223
EvalContext::exprs
char * exprs
Definition: aeval.c:67
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: aeval.c:210
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:65
VAR_T
@ VAR_T
Definition: aeval.c:51
AVFilterContext::priv
void * priv
private data for use by the filter
Definition: avfilter.h:348
EvalContext::same_chlayout
int same_chlayout
set output as input channel layout
Definition: aeval.c:64
val
static double val(void *priv, double ch)
Definition: aeval.c:76
func1_names
static const char *const func1_names[]
Definition: vf_rotate.c:196
av_expr_free
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:336
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:54
EvalContext::var_values
double var_values[VAR_VARS_NB]
Definition: aeval.c:71
avassert.h
TS2T
#define TS2T(ts, tb)
Definition: internal.h:209
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
av_cold
#define av_cold
Definition: attributes.h:90
inputs
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
Definition: filter_design.txt:243
var_name
var_name
Definition: setts_bsf.c:50
ff_set_common_formats
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:580
duration
int64_t duration
Definition: movenc.c:64
ff_add_channel_layout
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
Definition: formats.c:331
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
av_strtok
char * av_strtok(char *s, const char *delim, char **saveptr)
Split the string into several tokens which can be accessed by successive calls to av_strtok().
Definition: avstring.c:186
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
ctx
AVFormatContext * ctx
Definition: movenc.c:48
av_expr_eval
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:766
AVExpr
Definition: eval.c:157
NAN
#define NAN
Definition: mathematics.h:64
av_realloc_f
#define av_realloc_f(p, o, n)
Definition: tableprint_vlc.h:33
aevalsrc_options
static const AVOption aevalsrc_options[]
Definition: aeval.c:88
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
NULL
#define NULL
Definition: coverity.c:32
av_frame_copy_props
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:536
aeval_config_output
static int aeval_config_output(AVFilterLink *outlink)
Definition: aeval.c:391
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
ff_af_aeval
const AVFilter ff_af_aeval
parseutils.h
VAR_CH
@ VAR_CH
Definition: aeval.c:47
EvalContext
Definition: aeval.c:56
EvalContext::nb_in_channels
int nb_in_channels
number of input channels
Definition: aeval.c:63
OFFSET
#define OFFSET(x)
Definition: aeval.c:339
av_get_channel_layout_nb_channels
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
Return the number of channels in the channel layout.
Definition: channel_layout.c:226
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
eval.h
aeval_options
static const AVOption aeval_options[]
Definition: aeval.c:342
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
ff_parse_channel_layout
int ff_parse_channel_layout(int64_t *ret, int *nret, const char *arg, void *log_ctx)
Parse a channel layout or a corresponding integer representation.
Definition: formats.c:637
EvalContext::pts
int64_t pts
Definition: aeval.c:65
AVFrame::sample_rate
int sample_rate
Sample rate of the audio data.
Definition: frame.h:458
EvalContext::chlayout
int64_t chlayout
Definition: aeval.c:60
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
EvalContext::nb_channels
int nb_channels
number of output channels
Definition: aeval.c:62
VAR_VARS_NB
@ VAR_VARS_NB
Definition: aeval.c:53
aeval_func1
static double(*const aeval_func1[])(void *, double)
Definition: aeval.c:82
FFMIN
#define FFMIN(a, b)
Definition: common.h:105
VAR_NB_IN_CHANNELS
@ VAR_NB_IN_CHANNELS
Definition: aeval.c:49
sample_rates
sample_rates
Definition: ffmpeg_filter.c:156
internal.h
AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:126
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:369
i
int i
Definition: input.c:407
func1
static double(*const func1[])(void *, double)
Definition: vf_rotate.c:190
AV_TIME_BASE
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
AVFrame::extended_data
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:350
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:60
av_rescale
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
AVFilter
Filter definition.
Definition: avfilter.h:145
EvalContext::sample_rate_str
char * sample_rate_str
Definition: aeval.c:58
ret
ret
Definition: filter_design.txt:187
EvalContext::chlayout_str
char * chlayout_str
Definition: aeval.c:61
FF_COUNT2LAYOUT
#define FF_COUNT2LAYOUT(c)
Encode a channel count as a channel layout.
Definition: formats.h:103
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(aevalsrc)
ff_all_samplerates
AVFilterFormats * ff_all_samplerates(void)
Definition: formats.c:414
var_names
static const char *const var_names[]
Definition: aeval.c:36
channel_layout.h
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: aeval.c:419
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
avfilter.h
VAR_NB_OUT_CHANNELS
@ VAR_NB_OUT_CHANNELS
Definition: aeval.c:50
AV_SAMPLE_FMT_DBLP
@ AV_SAMPLE_FMT_DBLP
double, planar
Definition: samplefmt.h:70
VAR_N
@ VAR_N
Definition: aeval.c:48
AVFilterContext
An instance of a filter.
Definition: avfilter.h:333
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:259
parse_channel_expressions
static int parse_channel_expressions(AVFilterContext *ctx, int expected_nb_channels)
Definition: aeval.c:103
audio.h
av_get_default_channel_layout
int64_t av_get_default_channel_layout(int nb_channels)
Return default channel layout for a given number of channels.
Definition: channel_layout.c:231
EvalContext::n
uint64_t n
Definition: aeval.c:70
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: aeval.c:244
ff_parse_sample_rate
int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx)
Parse a sample rate.
Definition: formats.c:625
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
ff_set_common_samplerates
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:568
avstring.h
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
EvalContext::sample_rate
int sample_rate
Definition: aeval.c:59
ff_asrc_aevalsrc
const AVFilter ff_asrc_aevalsrc
VAR_S
@ VAR_S
Definition: aeval.c:52
EvalContext::channel_values
double * channel_values
Definition: aeval.c:72
request_frame
static int request_frame(AVFilterLink *outlink)
Definition: aeval.c:274
ff_set_common_channel_layouts
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:561
EvalContext::nb_samples
int nb_samples
number of samples per requested frame
Definition: aeval.c:68