FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/af_volume.c
Date: 2024-04-24 18:52:15
Exec Total Coverage
Lines: 124 208 59.6%
Functions: 9 14 64.3%
Branches: 50 110 45.5%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2011 Stefano Sabatini
3 * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
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 * audio volume filter
25 */
26
27 #include "libavutil/channel_layout.h"
28 #include "libavutil/common.h"
29 #include "libavutil/eval.h"
30 #include "libavutil/ffmath.h"
31 #include "libavutil/float_dsp.h"
32 #include "libavutil/mem.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/replaygain.h"
35
36 #include "audio.h"
37 #include "avfilter.h"
38 #include "formats.h"
39 #include "internal.h"
40 #include "af_volume.h"
41
42 static const char * const precision_str[] = {
43 "fixed", "float", "double"
44 };
45
46 static const char *const var_names[] = {
47 "n", ///< frame number (starting at zero)
48 "nb_channels", ///< number of channels
49 "nb_consumed_samples", ///< number of samples consumed by the filter
50 "nb_samples", ///< number of samples in the current frame
51 #if FF_API_FRAME_PKT
52 "pos", ///< position in the file of the frame
53 #endif
54 "pts", ///< frame presentation timestamp
55 "sample_rate", ///< sample rate
56 "startpts", ///< PTS at start of stream
57 "startt", ///< time at start of stream
58 "t", ///< time in the file of the frame
59 "tb", ///< timebase
60 "volume", ///< last set value
61 NULL
62 };
63
64 #define OFFSET(x) offsetof(VolumeContext, x)
65 #define A AV_OPT_FLAG_AUDIO_PARAM
66 #define F AV_OPT_FLAG_FILTERING_PARAM
67 #define T AV_OPT_FLAG_RUNTIME_PARAM
68
69 static const AVOption volume_options[] = {
70 { "volume", "set volume adjustment expression",
71 OFFSET(volume_expr), AV_OPT_TYPE_STRING, { .str = "1.0" }, .flags = A|F|T },
72 { "precision", "select mathematical precision",
73 OFFSET(precision), AV_OPT_TYPE_INT, { .i64 = PRECISION_FLOAT }, PRECISION_FIXED, PRECISION_DOUBLE, A|F, .unit = "precision" },
74 { "fixed", "select 8-bit fixed-point", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_FIXED }, INT_MIN, INT_MAX, A|F, .unit = "precision" },
75 { "float", "select 32-bit floating-point", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_FLOAT }, INT_MIN, INT_MAX, A|F, .unit = "precision" },
76 { "double", "select 64-bit floating-point", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_DOUBLE }, INT_MIN, INT_MAX, A|F, .unit = "precision" },
77 { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_ONCE}, 0, EVAL_MODE_NB-1, .flags = A|F, .unit = "eval" },
78 { "once", "eval volume expression once", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_ONCE}, .flags = A|F, .unit = "eval" },
79 { "frame", "eval volume expression per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = A|F, .unit = "eval" },
80 { "replaygain", "Apply replaygain side data when present",
81 OFFSET(replaygain), AV_OPT_TYPE_INT, { .i64 = REPLAYGAIN_DROP }, REPLAYGAIN_DROP, REPLAYGAIN_ALBUM, A|F, .unit = "replaygain" },
82 { "drop", "replaygain side data is dropped", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_DROP }, 0, 0, A|F, .unit = "replaygain" },
83 { "ignore", "replaygain side data is ignored", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_IGNORE }, 0, 0, A|F, .unit = "replaygain" },
84 { "track", "track gain is preferred", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_TRACK }, 0, 0, A|F, .unit = "replaygain" },
85 { "album", "album gain is preferred", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_ALBUM }, 0, 0, A|F, .unit = "replaygain" },
86 { "replaygain_preamp", "Apply replaygain pre-amplification",
87 OFFSET(replaygain_preamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.0 }, -15.0, 15.0, A|F },
88 { "replaygain_noclip", "Apply replaygain clipping prevention",
89 OFFSET(replaygain_noclip), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, A|F },
90 { NULL }
91 };
92
93 AVFILTER_DEFINE_CLASS(volume);
94
95 6 static int set_expr(AVExpr **pexpr, const char *expr, void *log_ctx)
96 {
97 int ret;
98 6 AVExpr *old = NULL;
99
100
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 6 if (*pexpr)
101 ✗ old = *pexpr;
102 6 ret = av_expr_parse(pexpr, expr, var_names,
103 NULL, NULL, NULL, NULL, 0, log_ctx);
104
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 6 if (ret < 0) {
105 ✗ av_log(log_ctx, AV_LOG_ERROR,
106 "Error when evaluating the volume expression '%s'\n", expr);
107 ✗ *pexpr = old;
108 ✗ return ret;
109 }
110
111 6 av_expr_free(old);
112 6 return 0;
113 }
114
115 6 static av_cold int init(AVFilterContext *ctx)
116 {
117 6 VolumeContext *vol = ctx->priv;
118
119 6 vol->fdsp = avpriv_float_dsp_alloc(0);
120
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 6 if (!vol->fdsp)
121 ✗ return AVERROR(ENOMEM);
122
123 6 return set_expr(&vol->volume_pexpr, vol->volume_expr, ctx);
124 }
125
126 6 static av_cold void uninit(AVFilterContext *ctx)
127 {
128 6 VolumeContext *vol = ctx->priv;
129 6 av_expr_free(vol->volume_pexpr);
130 6 av_opt_free(vol);
131 6 av_freep(&vol->fdsp);
132 6 }
133
134 3 static int query_formats(AVFilterContext *ctx)
135 {
136 3 VolumeContext *vol = ctx->priv;
137 static const enum AVSampleFormat sample_fmts[][7] = {
138 [PRECISION_FIXED] = {
139 AV_SAMPLE_FMT_U8,
140 AV_SAMPLE_FMT_U8P,
141 AV_SAMPLE_FMT_S16,
142 AV_SAMPLE_FMT_S16P,
143 AV_SAMPLE_FMT_S32,
144 AV_SAMPLE_FMT_S32P,
145 AV_SAMPLE_FMT_NONE
146 },
147 [PRECISION_FLOAT] = {
148 AV_SAMPLE_FMT_FLT,
149 AV_SAMPLE_FMT_FLTP,
150 AV_SAMPLE_FMT_NONE
151 },
152 [PRECISION_DOUBLE] = {
153 AV_SAMPLE_FMT_DBL,
154 AV_SAMPLE_FMT_DBLP,
155 AV_SAMPLE_FMT_NONE
156 }
157 };
158 3 int ret = ff_set_common_all_channel_counts(ctx);
159
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 3 if (ret < 0)
160 ✗ return ret;
161
162 3 ret = ff_set_common_formats_from_list(ctx, sample_fmts[vol->precision]);
163
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 3 if (ret < 0)
164 ✗ return ret;
165
166 3 return ff_set_common_all_samplerates(ctx);
167 }
168
169 ✗ static inline void scale_samples_u8(uint8_t *dst, const uint8_t *src,
170 int nb_samples, int volume)
171 {
172 int i;
173 ✗ for (i = 0; i < nb_samples; i++)
174 ✗ dst[i] = av_clip_uint8(((((int64_t)src[i] - 128) * volume + 128) >> 8) + 128);
175 ✗ }
176
177 ✗ static inline void scale_samples_u8_small(uint8_t *dst, const uint8_t *src,
178 int nb_samples, int volume)
179 {
180 int i;
181 ✗ for (i = 0; i < nb_samples; i++)
182 ✗ dst[i] = av_clip_uint8((((src[i] - 128) * volume + 128) >> 8) + 128);
183 ✗ }
184
185 ✗ static inline void scale_samples_s16(uint8_t *dst, const uint8_t *src,
186 int nb_samples, int volume)
187 {
188 int i;
189 ✗ int16_t *smp_dst = (int16_t *)dst;
190 ✗ const int16_t *smp_src = (const int16_t *)src;
191 ✗ for (i = 0; i < nb_samples; i++)
192 ✗ smp_dst[i] = av_clip_int16(((int64_t)smp_src[i] * volume + 128) >> 8);
193 ✗ }
194
195 65 static inline void scale_samples_s16_small(uint8_t *dst, const uint8_t *src,
196 int nb_samples, int volume)
197 {
198 int i;
199 65 int16_t *smp_dst = (int16_t *)dst;
200 65 const int16_t *smp_src = (const int16_t *)src;
201
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 529265 for (i = 0; i < nb_samples; i++)
202 529200 smp_dst[i] = av_clip_int16((smp_src[i] * volume + 128) >> 8);
203 65 }
204
205 ✗ static inline void scale_samples_s32(uint8_t *dst, const uint8_t *src,
206 int nb_samples, int volume)
207 {
208 int i;
209 ✗ int32_t *smp_dst = (int32_t *)dst;
210 ✗ const int32_t *smp_src = (const int32_t *)src;
211 ✗ for (i = 0; i < nb_samples; i++)
212 ✗ smp_dst[i] = av_clipl_int32((((int64_t)smp_src[i] * volume + 128) >> 8));
213 ✗ }
214
215 3 static av_cold void volume_init(VolumeContext *vol)
216 {
217 3 vol->samples_align = 1;
218
219
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 3 switch (av_get_packed_sample_fmt(vol->sample_fmt)) {
220 ✗ case AV_SAMPLE_FMT_U8:
221 ✗ if (vol->volume_i < 0x1000000)
222 ✗ vol->scale_samples = scale_samples_u8_small;
223 else
224 ✗ vol->scale_samples = scale_samples_u8;
225 ✗ break;
226 1 case AV_SAMPLE_FMT_S16:
227
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 1 if (vol->volume_i < 0x10000)
228 1 vol->scale_samples = scale_samples_s16_small;
229 else
230 ✗ vol->scale_samples = scale_samples_s16;
231 1 break;
232 1 case AV_SAMPLE_FMT_S32:
233 1 vol->scale_samples = scale_samples_s32;
234 1 break;
235 1 case AV_SAMPLE_FMT_FLT:
236 1 vol->samples_align = 4;
237 1 break;
238 ✗ case AV_SAMPLE_FMT_DBL:
239 ✗ vol->samples_align = 8;
240 ✗ break;
241 }
242
243 #if ARCH_X86
244 3 ff_volume_init_x86(vol);
245 #endif
246 3 }
247
248 3 static int set_volume(AVFilterContext *ctx)
249 {
250 3 VolumeContext *vol = ctx->priv;
251
252 3 vol->volume = av_expr_eval(vol->volume_pexpr, vol->var_values, NULL);
253
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 3 if (isnan(vol->volume)) {
254 ✗ if (vol->eval_mode == EVAL_MODE_ONCE) {
255 ✗ av_log(ctx, AV_LOG_ERROR, "Invalid value NaN for volume\n");
256 ✗ return AVERROR(EINVAL);
257 } else {
258 ✗ av_log(ctx, AV_LOG_WARNING, "Invalid value NaN for volume, setting to 0\n");
259 ✗ vol->volume = 0;
260 }
261 }
262 3 vol->var_values[VAR_VOLUME] = vol->volume;
263
264 3 av_log(ctx, AV_LOG_VERBOSE, "n:%f t:%f pts:%f precision:%s ",
265 vol->var_values[VAR_N], vol->var_values[VAR_T], vol->var_values[VAR_PTS],
266 3 precision_str[vol->precision]);
267
268
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 3 if (vol->precision == PRECISION_FIXED) {
269 2 vol->volume_i = (int)(vol->volume * 256 + 0.5);
270 2 vol->volume = vol->volume_i / 256.0;
271 2 av_log(ctx, AV_LOG_VERBOSE, "volume_i:%d/255 ", vol->volume_i);
272 }
273 3 av_log(ctx, AV_LOG_VERBOSE, "volume:%f volume_dB:%f\n",
274 3 vol->volume, 20.0*log10(vol->volume));
275
276 3 volume_init(vol);
277 3 return 0;
278 }
279
280 3 static int config_output(AVFilterLink *outlink)
281 {
282 3 AVFilterContext *ctx = outlink->src;
283 3 VolumeContext *vol = ctx->priv;
284 3 AVFilterLink *inlink = ctx->inputs[0];
285
286 3 vol->sample_fmt = inlink->format;
287 3 vol->channels = inlink->ch_layout.nb_channels;
288
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 3 vol->planes = av_sample_fmt_is_planar(inlink->format) ? vol->channels : 1;
289
290 3 vol->var_values[VAR_N] =
291 3 vol->var_values[VAR_NB_CONSUMED_SAMPLES] =
292 3 vol->var_values[VAR_NB_SAMPLES] =
293 #if FF_API_FRAME_PKT
294 3 vol->var_values[VAR_POS] =
295 #endif
296 3 vol->var_values[VAR_PTS] =
297 3 vol->var_values[VAR_STARTPTS] =
298 3 vol->var_values[VAR_STARTT] =
299 3 vol->var_values[VAR_T] =
300 3 vol->var_values[VAR_VOLUME] = NAN;
301
302 3 vol->var_values[VAR_NB_CHANNELS] = inlink->ch_layout.nb_channels;
303 3 vol->var_values[VAR_TB] = av_q2d(inlink->time_base);
304 3 vol->var_values[VAR_SAMPLE_RATE] = inlink->sample_rate;
305
306 3 av_log(inlink->src, AV_LOG_VERBOSE, "tb:%f sample_rate:%f nb_channels:%f\n",
307 vol->var_values[VAR_TB],
308 vol->var_values[VAR_SAMPLE_RATE],
309 vol->var_values[VAR_NB_CHANNELS]);
310
311 3 return set_volume(ctx);
312 }
313
314 ✗ static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
315 char *res, int res_len, int flags)
316 {
317 ✗ VolumeContext *vol = ctx->priv;
318 ✗ int ret = AVERROR(ENOSYS);
319
320 ✗ if (!strcmp(cmd, "volume")) {
321 ✗ if ((ret = set_expr(&vol->volume_pexpr, args, ctx)) < 0)
322 ✗ return ret;
323 ✗ if (vol->eval_mode == EVAL_MODE_ONCE)
324 ✗ set_volume(ctx);
325 }
326
327 ✗ return ret;
328 }
329
330 199 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
331 {
332 199 AVFilterContext *ctx = inlink->dst;
333 199 VolumeContext *vol = inlink->dst->priv;
334 199 AVFilterLink *outlink = inlink->dst->outputs[0];
335 199 int nb_samples = buf->nb_samples;
336 AVFrame *out_buf;
337 199 AVFrameSideData *sd = av_frame_get_side_data(buf, AV_FRAME_DATA_REPLAYGAIN);
338 int ret;
339
340
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 199 if (sd && vol->replaygain != REPLAYGAIN_IGNORE) {
341 ✗ if (vol->replaygain != REPLAYGAIN_DROP) {
342 ✗ AVReplayGain *replaygain = (AVReplayGain*)sd->data;
343 ✗ int32_t gain = 100000;
344 ✗ uint32_t peak = 100000;
345 float g, p;
346
347 ✗ if (vol->replaygain == REPLAYGAIN_TRACK &&
348 ✗ replaygain->track_gain != INT32_MIN) {
349 ✗ gain = replaygain->track_gain;
350
351 ✗ if (replaygain->track_peak != 0)
352 ✗ peak = replaygain->track_peak;
353 ✗ } else if (replaygain->album_gain != INT32_MIN) {
354 ✗ gain = replaygain->album_gain;
355
356 ✗ if (replaygain->album_peak != 0)
357 ✗ peak = replaygain->album_peak;
358 } else {
359 ✗ av_log(inlink->dst, AV_LOG_WARNING, "Both ReplayGain gain "
360 "values are unknown.\n");
361 }
362 ✗ g = gain / 100000.0f;
363 ✗ p = peak / 100000.0f;
364
365 ✗ av_log(inlink->dst, AV_LOG_VERBOSE,
366 "Using gain %f dB from replaygain side data.\n", g);
367
368 ✗ vol->volume = ff_exp10((g + vol->replaygain_preamp) / 20);
369 ✗ if (vol->replaygain_noclip)
370 ✗ vol->volume = FFMIN(vol->volume, 1.0 / p);
371 ✗ vol->volume_i = (int)(vol->volume * 256 + 0.5);
372
373 ✗ volume_init(vol);
374 }
375 ✗ av_frame_remove_side_data(buf, AV_FRAME_DATA_REPLAYGAIN);
376 }
377
378
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 199 if (isnan(vol->var_values[VAR_STARTPTS])) {
379
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 3 vol->var_values[VAR_STARTPTS] = TS2D(buf->pts);
380
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 3 vol->var_values[VAR_STARTT ] = TS2T(buf->pts, inlink->time_base);
381 }
382
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 199 vol->var_values[VAR_PTS] = TS2D(buf->pts);
383
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 199 vol->var_values[VAR_T ] = TS2T(buf->pts, inlink->time_base);
384 199 vol->var_values[VAR_N ] = inlink->frame_count_out;
385
386 #if FF_API_FRAME_PKT
387 FF_DISABLE_DEPRECATION_WARNINGS
388 {
389 int64_t pos;
390 199 pos = buf->pkt_pos;
391
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 199 vol->var_values[VAR_POS] = pos == -1 ? NAN : pos;
392 }
393 FF_ENABLE_DEPRECATION_WARNINGS
394 #endif
395
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 199 if (vol->eval_mode == EVAL_MODE_FRAME)
396 ✗ set_volume(ctx);
397
398
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 199 if (vol->volume == 1.0 || vol->volume_i == 256) {
399 ✗ out_buf = buf;
400 ✗ goto end;
401 }
402
403 /* do volume scaling in-place if input buffer is writable */
404
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 199 if (av_frame_is_writable(buf)
405
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 199 && (vol->precision != PRECISION_FIXED || vol->volume_i > 0)) {
406 106 out_buf = buf;
407 } else {
408 93 out_buf = ff_get_audio_buffer(outlink, nb_samples);
409
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 93 if (!out_buf) {
410 ✗ av_frame_free(&buf);
411 ✗ return AVERROR(ENOMEM);
412 }
413 93 ret = av_frame_copy_props(out_buf, buf);
414
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 93 if (ret < 0) {
415 ✗ av_frame_free(&out_buf);
416 ✗ av_frame_free(&buf);
417 ✗ return ret;
418 }
419 }
420
421
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 199 if (vol->precision != PRECISION_FIXED || vol->volume_i > 0) {
422 int p, plane_samples;
423
424
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 106 if (av_sample_fmt_is_planar(buf->format))
425 41 plane_samples = FFALIGN(nb_samples, vol->samples_align);
426 else
427 65 plane_samples = FFALIGN(nb_samples * vol->channels, vol->samples_align);
428
429
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 106 if (vol->precision == PRECISION_FIXED) {
430
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 130 for (p = 0; p < vol->planes; p++) {
431 65 vol->scale_samples(out_buf->extended_data[p],
432 65 buf->extended_data[p], plane_samples,
433 vol->volume_i);
434 }
435
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 41 } else if (av_get_packed_sample_fmt(vol->sample_fmt) == AV_SAMPLE_FMT_FLT) {
436
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 123 for (p = 0; p < vol->planes; p++) {
437 82 vol->fdsp->vector_fmul_scalar((float *)out_buf->extended_data[p],
438 82 (const float *)buf->extended_data[p],
439 82 vol->volume, plane_samples);
440 }
441 } else {
442 ✗ for (p = 0; p < vol->planes; p++) {
443 ✗ vol->fdsp->vector_dmul_scalar((double *)out_buf->extended_data[p],
444 ✗ (const double *)buf->extended_data[p],
445 vol->volume, plane_samples);
446 }
447 }
448 }
449
450
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 199 if (buf != out_buf)
451 93 av_frame_free(&buf);
452
453 106 end:
454 199 vol->var_values[VAR_NB_CONSUMED_SAMPLES] += out_buf->nb_samples;
455 199 return ff_filter_frame(outlink, out_buf);
456 }
457
458 static const AVFilterPad avfilter_af_volume_inputs[] = {
459 {
460 .name = "default",
461 .type = AVMEDIA_TYPE_AUDIO,
462 .filter_frame = filter_frame,
463 },
464 };
465
466 static const AVFilterPad avfilter_af_volume_outputs[] = {
467 {
468 .name = "default",
469 .type = AVMEDIA_TYPE_AUDIO,
470 .config_props = config_output,
471 },
472 };
473
474 const AVFilter ff_af_volume = {
475 .name = "volume",
476 .description = NULL_IF_CONFIG_SMALL("Change input volume."),
477 .priv_size = sizeof(VolumeContext),
478 .priv_class = &volume_class,
479 .init = init,
480 .uninit = uninit,
481 FILTER_INPUTS(avfilter_af_volume_inputs),
482 FILTER_OUTPUTS(avfilter_af_volume_outputs),
483 FILTER_QUERY_FUNC(query_formats),
484 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
485 .process_command = process_command,
486 };
487