GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/aeval.c Lines: 141 184 76.6 %
Date: 2020-08-11 16:46:18 Branches: 52 106 49.1 %

Line Branch Exec Source
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"
28
#include "libavutil/channel_layout.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 {
47
    VAR_CH,
48
    VAR_N,
49
    VAR_NB_IN_CHANNELS,
50
    VAR_NB_OUT_CHANNELS,
51
    VAR_T,
52
    VAR_S,
53
    VAR_VARS_NB
54
};
55
56
typedef struct EvalContext {
57
    const AVClass *class;
58
    char *sample_rate_str;
59
    int sample_rate;
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;
66
    AVExpr **expr;
67
    char *exprs;
68
    int nb_samples;             ///< number of samples per requested frame
69
    int64_t duration;
70
    uint64_t n;
71
    double var_values[VAR_VARS_NB];
72
    double *channel_values;
73
    int64_t out_channel_layout;
74
} EvalContext;
75
76
264600
static double val(void *priv, double ch)
77
{
78
264600
    EvalContext *eval = priv;
79
264600
    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
103
15
static int parse_channel_expressions(AVFilterContext *ctx,
104
                                     int expected_nb_channels)
105
{
106
15
    EvalContext *eval = ctx->priv;
107
15
    char *args1 = av_strdup(eval->exprs);
108
15
    char *expr, *last_expr = NULL, *buf;
109
15
    double (* const *func1)(void *, double) = NULL;
110
15
    const char * const *func1_names = NULL;
111
15
    int i, ret = 0;
112
113
15
    if (!args1)
114
        return AVERROR(ENOMEM);
115
116
15
    if (!eval->exprs) {
117
        av_log(ctx, AV_LOG_ERROR, "Channels expressions list is empty\n");
118
        return AVERROR(EINVAL);
119
    }
120
121
15
    if (!strcmp(ctx->filter->name, "aeval")) {
122
1
        func1 = aeval_func1;
123
1
        func1_names = aeval_func1_names;
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
15
    for (i = 0; i < eval->nb_channels; i++) {
142
        av_expr_free(eval->expr[i]);
143
        eval->expr[i] = NULL;
144
    }
145
15
    av_freep(&eval->expr);
146
15
    eval->nb_channels = 0;
147
148
15
    buf = args1;
149
30
    while (expr = av_strtok(buf, "|", &buf)) {
150

15
        ADD_EXPRESSION(expr);
151
15
        last_expr = expr;
152
    }
153
154
15
    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

15
    if (expected_nb_channels > 0 && eval->nb_channels != expected_nb_channels) {
159
        av_log(ctx, AV_LOG_ERROR,
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
15
end:
168
15
    av_free(args1);
169
15
    return ret;
170
}
171
172
15
static av_cold int init(AVFilterContext *ctx)
173
{
174
15
    EvalContext *eval = ctx->priv;
175
15
    int ret = 0;
176
177
15
    if (eval->chlayout_str) {
178
        if (!strcmp(eval->chlayout_str, "same") && !strcmp(ctx->filter->name, "aeval")) {
179
            eval->same_chlayout = 1;
180
        } else {
181
            ret = ff_parse_channel_layout(&eval->chlayout, NULL, eval->chlayout_str, ctx);
182
            if (ret < 0)
183
                return ret;
184
185
            ret = parse_channel_expressions(ctx, av_get_channel_layout_nb_channels(eval->chlayout));
186
            if (ret < 0)
187
                return ret;
188
        }
189
    } else {
190
        /* guess channel layout from nb expressions/channels */
191
15
        if ((ret = parse_channel_expressions(ctx, -1)) < 0)
192
            return ret;
193
194
15
        eval->chlayout = av_get_default_channel_layout(eval->nb_channels);
195

15
        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
15
    if (eval->sample_rate_str)
203
14
        if ((ret = ff_parse_sample_rate(&eval->sample_rate, eval->sample_rate_str, ctx)))
204
            return ret;
205
15
    eval->n = 0;
206
207
15
    return ret;
208
}
209
210
15
static av_cold void uninit(AVFilterContext *ctx)
211
{
212
15
    EvalContext *eval = ctx->priv;
213
    int i;
214
215
30
    for (i = 0; i < eval->nb_channels; i++) {
216
15
        av_expr_free(eval->expr[i]);
217
15
        eval->expr[i] = NULL;
218
    }
219
15
    av_freep(&eval->expr);
220
15
    av_freep(&eval->channel_values);
221
15
}
222
223
13
static int config_props(AVFilterLink *outlink)
224
{
225
13
    EvalContext *eval = outlink->src->priv;
226
    char buf[128];
227
228
13
    outlink->time_base = (AVRational){1, eval->sample_rate};
229
13
    outlink->sample_rate = eval->sample_rate;
230
231
13
    eval->var_values[VAR_S] = eval->sample_rate;
232
13
    eval->var_values[VAR_NB_IN_CHANNELS] = NAN;
233
13
    eval->var_values[VAR_NB_OUT_CHANNELS] = outlink->channels;
234
235
13
    av_get_channel_layout_string(buf, sizeof(buf), 0, eval->chlayout);
236
237
13
    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
13
    return 0;
242
}
243
244
13
static int query_formats(AVFilterContext *ctx)
245
{
246
13
    EvalContext *eval = ctx->priv;
247
    static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_DBLP, AV_SAMPLE_FMT_NONE };
248
13
    int64_t chlayouts[] = { eval->chlayout ? eval->chlayout : FF_COUNT2LAYOUT(eval->nb_channels) , -1 };
249
13
    int sample_rates[] = { eval->sample_rate, -1 };
250
    AVFilterFormats *formats;
251
    AVFilterChannelLayouts *layouts;
252
    int ret;
253
254
13
    formats = ff_make_format_list(sample_fmts);
255
13
    if (!formats)
256
        return AVERROR(ENOMEM);
257
13
    ret = ff_set_common_formats (ctx, formats);
258
13
    if (ret < 0)
259
        return ret;
260
261
13
    layouts = avfilter_make_format64_list(chlayouts);
262
13
    if (!layouts)
263
        return AVERROR(ENOMEM);
264
13
    ret = ff_set_common_channel_layouts(ctx, layouts);
265
13
    if (ret < 0)
266
        return ret;
267
268
13
    formats = ff_make_format_list(sample_rates);
269
13
    if (!formats)
270
        return AVERROR(ENOMEM);
271
13
    return ff_set_common_samplerates(ctx, formats);
272
}
273
274
8472
static int request_frame(AVFilterLink *outlink)
275
{
276
8472
    EvalContext *eval = outlink->src->priv;
277
    AVFrame *samplesref;
278
    int i, j;
279
8472
    int64_t t = av_rescale(eval->n, AV_TIME_BASE, eval->sample_rate);
280
    int nb_samples;
281
282

8472
    if (eval->duration >= 0 && t >= eval->duration)
283
13
        return AVERROR_EOF;
284
285
8459
    if (eval->duration >= 0) {
286
8459
        nb_samples = FFMIN(eval->nb_samples, av_rescale(eval->duration, eval->sample_rate, AV_TIME_BASE) - eval->pts);
287
8459
        if (!nb_samples)
288
            return AVERROR_EOF;
289
    } else {
290
        nb_samples = eval->nb_samples;
291
    }
292
8459
    samplesref = ff_get_audio_buffer(outlink, nb_samples);
293
8459
    if (!samplesref)
294
        return AVERROR(ENOMEM);
295
296
    /* evaluate expression for each single sample and for each channel */
297
8661982
    for (i = 0; i < nb_samples; i++, eval->n++) {
298
8653523
        eval->var_values[VAR_N] = eval->n;
299
8653523
        eval->var_values[VAR_T] = eval->var_values[VAR_N] * (double)1/eval->sample_rate;
300
301
17307046
        for (j = 0; j < eval->nb_channels; j++) {
302
8653523
            *((double *) samplesref->extended_data[j] + i) =
303
8653523
                av_expr_eval(eval->expr[j], eval->var_values, NULL);
304
        }
305
    }
306
307
8459
    samplesref->pts = eval->pts;
308
8459
    samplesref->sample_rate = eval->sample_rate;
309
8459
    eval->pts += nb_samples;
310
311
8459
    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
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
351
1
static int aeval_query_formats(AVFilterContext *ctx)
352
{
353
1
    AVFilterFormats *formats = NULL;
354
    AVFilterChannelLayouts *layouts;
355
1
    AVFilterLink *inlink  = ctx->inputs[0];
356
1
    AVFilterLink *outlink  = ctx->outputs[0];
357
1
    EvalContext *eval = ctx->priv;
358
    static const enum AVSampleFormat sample_fmts[] = {
359
        AV_SAMPLE_FMT_DBLP, AV_SAMPLE_FMT_NONE
360
    };
361
    int ret;
362
363
    // inlink supports any channel layout
364
1
    layouts = ff_all_channel_counts();
365
1
    if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0)
366
        return ret;
367
368
1
    if (eval->same_chlayout) {
369
        layouts = ff_all_channel_counts();
370
        if ((ret = ff_set_common_channel_layouts(ctx, layouts)) < 0)
371
            return ret;
372
    } else {
373
        // outlink supports only requested output channel layout
374
1
        layouts = NULL;
375
1
        if ((ret = ff_add_channel_layout(&layouts,
376
1
                              eval->out_channel_layout ? eval->out_channel_layout :
377
1
                              FF_COUNT2LAYOUT(eval->nb_channels))) < 0)
378
            return ret;
379
1
        if ((ret = ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts)) < 0)
380
            return ret;
381
    }
382
383
1
    formats = ff_make_format_list(sample_fmts);
384
1
    if ((ret = ff_set_common_formats(ctx, formats)) < 0)
385
        return ret;
386
387
1
    formats = ff_all_samplerates();
388
1
    return ff_set_common_samplerates(ctx, formats);
389
}
390
391
1
static int aeval_config_output(AVFilterLink *outlink)
392
{
393
1
    AVFilterContext *ctx = outlink->src;
394
1
    EvalContext *eval = ctx->priv;
395
1
    AVFilterLink *inlink = ctx->inputs[0];
396
    int ret;
397
398
1
    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
1
    eval->n = 0;
406
1
    eval->nb_in_channels = eval->var_values[VAR_NB_IN_CHANNELS] = inlink->channels;
407
1
    eval->var_values[VAR_NB_OUT_CHANNELS] = outlink->channels;
408
1
    eval->var_values[VAR_S] = inlink->sample_rate;
409
1
    eval->var_values[VAR_T] = NAN;
410
411
2
    eval->channel_values = av_realloc_f(eval->channel_values,
412
1
                                        inlink->channels, sizeof(*eval->channel_values));
413
1
    if (!eval->channel_values)
414
        return AVERROR(ENOMEM);
415
416
1
    return 0;
417
}
418
419
130
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
420
{
421
130
    EvalContext *eval     = inlink->dst->priv;
422
130
    AVFilterLink *outlink = inlink->dst->outputs[0];
423
130
    int nb_samples        = in->nb_samples;
424
    AVFrame *out;
425
    double t0;
426
    int i, j;
427
428
130
    out = ff_get_audio_buffer(outlink, nb_samples);
429
130
    if (!out) {
430
        av_frame_free(&in);
431
        return AVERROR(ENOMEM);
432
    }
433
130
    av_frame_copy_props(out, in);
434
435
130
    t0 = TS2T(in->pts, inlink->time_base);
436
437
    /* evaluate expression for each single sample and for each channel */
438
264730
    for (i = 0; i < nb_samples; i++, eval->n++) {
439
264600
        eval->var_values[VAR_N] = eval->n;
440
264600
        eval->var_values[VAR_T] = t0 + i * (double)1/inlink->sample_rate;
441
442
529200
        for (j = 0; j < inlink->channels; j++)
443
264600
            eval->channel_values[j] = *((double *) in->extended_data[j] + i);
444
445
529200
        for (j = 0; j < outlink->channels; j++) {
446
264600
            eval->var_values[VAR_CH] = j;
447
264600
            *((double *) out->extended_data[j] + i) =
448
264600
                av_expr_eval(eval->expr[j], eval->var_values, eval);
449
        }
450
    }
451
452
130
    av_frame_free(&in);
453
130
    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
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,
486
};
487
488
#endif /* CONFIG_AEVAL_FILTER */