FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* Copyright (c) 2016 Paul B Mahol
3			*
4			* This file is part of FFmpeg.
5			*
6			* FFmpeg is free software; you can redistribute it and/or modify it
7			* under the terms of the GNU Lesser General Public License as published
8			* by the Free Software Foundation; either version 2.1 of the License,
9			* 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			#include "libavutil/avstring.h"
22			#include "libavutil/mem.h"
23			#include "libavutil/common.h"
24			#include "libavutil/cpu.h"
25			#include "libavutil/opt.h"
26			#include "libavutil/eval.h"
27			#include "libavutil/tx.h"
28			#include "audio.h"
29			#include "filters.h"
30			#include "window_func.h"
31
32			typedef struct AFFTFiltContext {
33			const AVClass *class;
34			char *real_str;
35			char *img_str;
36			int fft_size;
37
38			AVTXContext **fft, **ifft;
39			av_tx_fn tx_fn, itx_fn;
40			AVComplexFloat **fft_in;
41			AVComplexFloat **fft_out;
42			AVComplexFloat **fft_temp;
43			int nb_exprs;
44			int channels;
45			int window_size;
46			AVExpr **real;
47			AVExpr **imag;
48			int hop_size;
49			float overlap;
50			AVFrame *window;
51			AVFrame *buffer;
52			int win_func;
53			float *window_func_lut;
54			} AFFTFiltContext;
55
56			static const char *const var_names[] = { "sr", "b", "nb", "ch", "chs", "pts", "re", "im", NULL };
57			enum { VAR_SAMPLE_RATE, VAR_BIN, VAR_NBBINS, VAR_CHANNEL, VAR_CHANNELS, VAR_PTS, VAR_REAL, VAR_IMAG, VAR_VARS_NB };
58
59			#define OFFSET(x) offsetof(AFFTFiltContext, x)
60			#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
61
62			static const AVOption afftfilt_options[] = {
63			{ "real", "set channels real expressions", OFFSET(real_str), AV_OPT_TYPE_STRING, {.str = "re" }, 0, 0, A },
64			{ "imag", "set channels imaginary expressions", OFFSET(img_str), AV_OPT_TYPE_STRING, {.str = "im" }, 0, 0, A },
65			{ "win_size", "set window size", OFFSET(fft_size), AV_OPT_TYPE_INT, {.i64=4096}, 16, 131072, A },
66			WIN_FUNC_OPTION("win_func", OFFSET(win_func), A, WFUNC_HANNING),
67			{ "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=0.75}, 0, 1, A },
68			{ NULL },
69			};
70
71			AVFILTER_DEFINE_CLASS(afftfilt);
72
73		✗	static inline double getreal(void *priv, double x, double ch)
74			{
75		✗	AFFTFiltContext *s = priv;
76			int ich, ix;
77
78		✗	ich = av_clip(ch, 0, s->nb_exprs - 1);
79		✗	ix = av_clip(x, 0, s->window_size / 2);
80
81		✗	return s->fft_out[ich][ix].re;
82			}
83
84		✗	static inline double getimag(void *priv, double x, double ch)
85			{
86		✗	AFFTFiltContext *s = priv;
87			int ich, ix;
88
89		✗	ich = av_clip(ch, 0, s->nb_exprs - 1);
90		✗	ix = av_clip(x, 0, s->window_size / 2);
91
92		✗	return s->fft_out[ich][ix].im;
93			}
94
95		✗	static double realf(void *priv, double x, double ch) { return getreal(priv, x, ch); }
96		✗	static double imagf(void *priv, double x, double ch) { return getimag(priv, x, ch); }
97
98			static const char *const func2_names[] = { "real", "imag", NULL };
99			static double (*const func2[])(void *, double, double) = { realf, imagf, NULL };
100
101		✗	static int config_input(AVFilterLink *inlink)
102			{
103		✗	AVFilterContext *ctx = inlink->dst;
104		✗	AFFTFiltContext *s = ctx->priv;
105		✗	char *saveptr = NULL;
106		✗	int ret = 0, ch;
107		✗	float overlap, scale = 1.f;
108			char *args;
109		✗	const char *last_expr = "1";
110			int buf_size;
111
112		✗	s->channels = inlink->ch_layout.nb_channels;
113		✗	s->fft = av_calloc(s->channels, sizeof(*s->fft));
114		✗	s->ifft = av_calloc(s->channels, sizeof(*s->ifft));
115		✗	if (!s->fft || !s->ifft)
116		✗	return AVERROR(ENOMEM);
117
118		✗	for (int ch = 0; ch < s->channels; ch++) {
119		✗	ret = av_tx_init(&s->fft[ch], &s->tx_fn, AV_TX_FLOAT_FFT, 0, s->fft_size, &scale, 0);
120		✗	if (ret < 0)
121		✗	return ret;
122			}
123
124		✗	for (int ch = 0; ch < s->channels; ch++) {
125		✗	ret = av_tx_init(&s->ifft[ch], &s->itx_fn, AV_TX_FLOAT_FFT, 1, s->fft_size, &scale, 0);
126		✗	if (ret < 0)
127		✗	return ret;
128			}
129
130		✗	s->window_size = s->fft_size;
131		✗	buf_size = FFALIGN(s->window_size, av_cpu_max_align());
132
133		✗	s->fft_in = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->fft_in));
134		✗	if (!s->fft_in)
135		✗	return AVERROR(ENOMEM);
136
137		✗	s->fft_out = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->fft_out));
138		✗	if (!s->fft_out)
139		✗	return AVERROR(ENOMEM);
140
141		✗	s->fft_temp = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->fft_temp));
142		✗	if (!s->fft_temp)
143		✗	return AVERROR(ENOMEM);
144
145		✗	for (ch = 0; ch < inlink->ch_layout.nb_channels; ch++) {
146		✗	s->fft_in[ch] = av_calloc(buf_size, sizeof(**s->fft_in));
147		✗	if (!s->fft_in[ch])
148		✗	return AVERROR(ENOMEM);
149
150		✗	s->fft_out[ch] = av_calloc(buf_size, sizeof(**s->fft_out));
151		✗	if (!s->fft_out[ch])
152		✗	return AVERROR(ENOMEM);
153
154		✗	s->fft_temp[ch] = av_calloc(buf_size, sizeof(**s->fft_temp));
155		✗	if (!s->fft_temp[ch])
156		✗	return AVERROR(ENOMEM);
157			}
158
159		✗	s->real = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->real));
160		✗	if (!s->real)
161		✗	return AVERROR(ENOMEM);
162
163		✗	s->imag = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->imag));
164		✗	if (!s->imag)
165		✗	return AVERROR(ENOMEM);
166
167		✗	args = av_strdup(s->real_str);
168		✗	if (!args)
169		✗	return AVERROR(ENOMEM);
170
171		✗	for (ch = 0; ch < inlink->ch_layout.nb_channels; ch++) {
172		✗	char *arg = av_strtok(ch == 0 ? args : NULL, "|", &saveptr);
173
174		✗	ret = av_expr_parse(&s->real[ch], arg ? arg : last_expr, var_names,
175			NULL, NULL, func2_names, func2, 0, ctx);
176		✗	if (ret < 0)
177		✗	goto fail;
178		✗	if (arg)
179		✗	last_expr = arg;
180		✗	s->nb_exprs++;
181			}
182
183		✗	av_freep(&args);
184
185		✗	args = av_strdup(s->img_str ? s->img_str : s->real_str);
186		✗	if (!args)
187		✗	return AVERROR(ENOMEM);
188
189		✗	saveptr = NULL;
190		✗	last_expr = "1";
191		✗	for (ch = 0; ch < inlink->ch_layout.nb_channels; ch++) {
192		✗	char *arg = av_strtok(ch == 0 ? args : NULL, "|", &saveptr);
193
194		✗	ret = av_expr_parse(&s->imag[ch], arg ? arg : last_expr, var_names,
195			NULL, NULL, func2_names, func2, 0, ctx);
196		✗	if (ret < 0)
197		✗	goto fail;
198		✗	if (arg)
199		✗	last_expr = arg;
200			}
201
202		✗	av_freep(&args);
203
204		✗	s->window_func_lut = av_realloc_f(s->window_func_lut, s->window_size,
205			sizeof(*s->window_func_lut));
206		✗	if (!s->window_func_lut)
207		✗	return AVERROR(ENOMEM);
208		✗	generate_window_func(s->window_func_lut, s->window_size, s->win_func, &overlap);
209		✗	for (int i = 0; i < s->window_size; i++)
210		✗	s->window_func_lut[i] = sqrtf(s->window_func_lut[i] / s->window_size);
211		✗	if (s->overlap == 1)
212		✗	s->overlap = overlap;
213
214		✗	s->hop_size = s->window_size * (1 - s->overlap);
215		✗	if (s->hop_size <= 0)
216		✗	return AVERROR(EINVAL);
217
218		✗	s->window = ff_get_audio_buffer(inlink, s->window_size * 2);
219		✗	if (!s->window)
220		✗	return AVERROR(ENOMEM);
221
222		✗	s->buffer = ff_get_audio_buffer(inlink, s->window_size * 2);
223		✗	if (!s->buffer)
224		✗	return AVERROR(ENOMEM);
225
226		✗	fail:
227		✗	av_freep(&args);
228
229		✗	return ret;
230			}
231
232		✗	static int tx_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
233			{
234		✗	AFFTFiltContext *s = ctx->priv;
235		✗	const int channels = s->channels;
236		✗	const int start = (channels * jobnr) / nb_jobs;
237		✗	const int end = (channels * (jobnr+1)) / nb_jobs;
238
239		✗	for (int ch = start; ch < end; ch++) {
240		✗	AVComplexFloat *fft_in = s->fft_in[ch];
241		✗	AVComplexFloat *fft_out = s->fft_out[ch];
242
243		✗	s->tx_fn(s->fft[ch], fft_out, fft_in, sizeof(*fft_in));
244			}
245
246		✗	return 0;
247			}
248
249		✗	static int filter_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
250			{
251		✗	AFFTFiltContext *s = ctx->priv;
252		✗	const int window_size = s->window_size;
253		✗	const float *window_lut = s->window_func_lut;
254		✗	const float f = sqrtf(1.f - s->overlap);
255		✗	const int channels = s->channels;
256		✗	const int start = (channels * jobnr) / nb_jobs;
257		✗	const int end = (channels * (jobnr+1)) / nb_jobs;
258			double values[VAR_VARS_NB];
259
260		✗	memcpy(values, arg, sizeof(values));
261
262		✗	for (int ch = start; ch < end; ch++) {
263		✗	AVComplexFloat *fft_out = s->fft_out[ch];
264		✗	AVComplexFloat *fft_temp = s->fft_temp[ch];
265		✗	float *buf = (float *)s->buffer->extended_data[ch];
266
267		✗	values[VAR_CHANNEL] = ch;
268
269		✗	if (ctx->is_disabled) {
270		✗	for (int n = 0; n < window_size; n++) {
271		✗	fft_temp[n].re = fft_out[n].re;
272		✗	fft_temp[n].im = fft_out[n].im;
273			}
274			} else {
275		✗	for (int n = 0; n <= window_size / 2; n++) {
276			float fr, fi;
277
278		✗	values[VAR_BIN] = n;
279		✗	values[VAR_REAL] = fft_out[n].re;
280		✗	values[VAR_IMAG] = fft_out[n].im;
281
282		✗	fr = av_expr_eval(s->real[ch], values, s);
283		✗	fi = av_expr_eval(s->imag[ch], values, s);
284
285		✗	fft_temp[n].re = fr;
286		✗	fft_temp[n].im = fi;
287			}
288
289		✗	for (int n = window_size / 2 + 1, x = window_size / 2 - 1; n < window_size; n++, x--) {
290		✗	fft_temp[n].re = fft_temp[x].re;
291		✗	fft_temp[n].im = -fft_temp[x].im;
292			}
293			}
294
295		✗	s->itx_fn(s->ifft[ch], fft_out, fft_temp, sizeof(*fft_temp));
296
297		✗	memmove(buf, buf + s->hop_size, window_size * sizeof(float));
298		✗	for (int i = 0; i < window_size; i++)
299		✗	buf[i] += fft_out[i].re * window_lut[i] * f;
300			}
301
302		✗	return 0;
303			}
304
305		✗	static int filter_frame(AVFilterLink *inlink, AVFrame *in)
306			{
307		✗	AVFilterContext *ctx = inlink->dst;
308		✗	AVFilterLink *outlink = ctx->outputs[0];
309		✗	AFFTFiltContext *s = ctx->priv;
310		✗	const int window_size = s->window_size;
311		✗	const float *window_lut = s->window_func_lut;
312			double values[VAR_VARS_NB];
313			int ch, n, ret;
314			AVFrame *out;
315
316		✗	for (ch = 0; ch < inlink->ch_layout.nb_channels; ch++) {
317		✗	const int offset = s->window_size - s->hop_size;
318		✗	float *src = (float *)s->window->extended_data[ch];
319		✗	AVComplexFloat *fft_in = s->fft_in[ch];
320
321		✗	memmove(src, &src[s->hop_size], offset * sizeof(float));
322		✗	memcpy(&src[offset], in->extended_data[ch], in->nb_samples * sizeof(float));
323		✗	memset(&src[offset + in->nb_samples], 0, (s->hop_size - in->nb_samples) * sizeof(float));
324
325		✗	for (n = 0; n < window_size; n++) {
326		✗	fft_in[n].re = src[n] * window_lut[n];
327		✗	fft_in[n].im = 0;
328			}
329			}
330
331		✗	values[VAR_PTS] = in->pts;
332		✗	values[VAR_SAMPLE_RATE] = inlink->sample_rate;
333		✗	values[VAR_NBBINS] = window_size / 2;
334		✗	values[VAR_CHANNELS] = inlink->ch_layout.nb_channels;
335
336		✗	ff_filter_execute(ctx, tx_channel, NULL, NULL,
337		✗	FFMIN(s->channels, ff_filter_get_nb_threads(ctx)));
338
339		✗	ff_filter_execute(ctx, filter_channel, values, NULL,
340		✗	FFMIN(s->channels, ff_filter_get_nb_threads(ctx)));
341
342		✗	out = ff_get_audio_buffer(outlink, s->hop_size);
343		✗	if (!out) {
344		✗	ret = AVERROR(ENOMEM);
345		✗	goto fail;
346			}
347
348		✗	av_frame_copy_props(out, in);
349		✗	out->nb_samples = in->nb_samples;
350
351		✗	for (ch = 0; ch < inlink->ch_layout.nb_channels; ch++) {
352		✗	float *dst = (float *)out->extended_data[ch];
353		✗	float *buf = (float *)s->buffer->extended_data[ch];
354
355		✗	memcpy(dst, buf, s->hop_size * sizeof(float));
356			}
357
358		✗	ret = ff_filter_frame(outlink, out);
359		✗	if (ret < 0)
360		✗	goto fail;
361
362		✗	fail:
363		✗	av_frame_free(&in);
364		✗	return ret < 0 ? ret : 0;
365			}
366
367		✗	static int activate(AVFilterContext *ctx)
368			{
369		✗	AVFilterLink *inlink = ctx->inputs[0];
370		✗	AVFilterLink *outlink = ctx->outputs[0];
371		✗	AFFTFiltContext *s = ctx->priv;
372		✗	AVFrame *in = NULL;
373		✗	int ret = 0, status;
374			int64_t pts;
375
376		✗	FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
377
378		✗	ret = ff_inlink_consume_samples(inlink, s->hop_size, s->hop_size, &in);
379		✗	if (ret < 0)
380		✗	return ret;
381
382		✗	if (ret > 0)
383		✗	ret = filter_frame(inlink, in);
384		✗	if (ret < 0)
385		✗	return ret;
386
387		✗	if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
388		✗	ff_outlink_set_status(outlink, status, pts);
389		✗	return 0;
390			}
391
392		✗	FF_FILTER_FORWARD_WANTED(outlink, inlink);
393
394		✗	return FFERROR_NOT_READY;
395			}
396
397		✗	static av_cold void uninit(AVFilterContext *ctx)
398			{
399		✗	AFFTFiltContext *s = ctx->priv;
400			int i;
401
402
403		✗	for (i = 0; i < s->channels; i++) {
404		✗	if (s->ifft)
405		✗	av_tx_uninit(&s->ifft[i]);
406		✗	if (s->fft)
407		✗	av_tx_uninit(&s->fft[i]);
408		✗	if (s->fft_in)
409		✗	av_freep(&s->fft_in[i]);
410		✗	if (s->fft_out)
411		✗	av_freep(&s->fft_out[i]);
412		✗	if (s->fft_temp)
413		✗	av_freep(&s->fft_temp[i]);
414			}
415
416		✗	av_freep(&s->fft);
417		✗	av_freep(&s->ifft);
418		✗	av_freep(&s->fft_in);
419		✗	av_freep(&s->fft_out);
420		✗	av_freep(&s->fft_temp);
421
422		✗	for (i = 0; i < s->nb_exprs; i++) {
423		✗	av_expr_free(s->real[i]);
424		✗	av_expr_free(s->imag[i]);
425			}
426
427		✗	av_freep(&s->real);
428		✗	av_freep(&s->imag);
429		✗	av_frame_free(&s->buffer);
430		✗	av_frame_free(&s->window);
431		✗	av_freep(&s->window_func_lut);
432		✗	}
433
434			static const AVFilterPad inputs[] = {
435			{
436			.name = "default",
437			.type = AVMEDIA_TYPE_AUDIO,
438			.config_props = config_input,
439			},
440			};
441
442			const FFFilter ff_af_afftfilt = {
443			.p.name = "afftfilt",
444			.p.description = NULL_IF_CONFIG_SMALL("Apply arbitrary expressions to samples in frequency domain."),
445			.p.priv_class = &afftfilt_class,
446			.p.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
447			AVFILTER_FLAG_SLICE_THREADS,
448			.priv_size = sizeof(AFFTFiltContext),
449			FILTER_INPUTS(inputs),
450			FILTER_OUTPUTS(ff_audio_default_filterpad),
451			FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_FLTP),
452			.activate = activate,
453			.uninit = uninit,
454			};
455