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1 | /* |
2 | * Copyright (c) 2012 Clément Bœsch | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
6 | * FFmpeg is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (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 | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with FFmpeg; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | /** | |
22 | * @file | |
23 | * EBU R.128 implementation | |
24 | * @see http://tech.ebu.ch/loudness | |
25 | * @see https://www.youtube.com/watch?v=iuEtQqC-Sqo "EBU R128 Introduction - Florian Camerer" | |
26 | * @todo implement start/stop/reset through filter command injection | |
27 | * @todo support other frequencies to avoid resampling | |
28 | */ | |
29 | ||
30 | #include <math.h> | |
31 | ||
32 | #include "libavutil/avassert.h" | |
33 | #include "libavutil/avstring.h" | |
34 | #include "libavutil/channel_layout.h" | |
35 | #include "libavutil/dict.h" | |
36 | #include "libavutil/xga_font_data.h" | |
37 | #include "libavutil/opt.h" | |
38 | #include "libavutil/timestamp.h" | |
39 | #include "libswresample/swresample.h" | |
40 | #include "audio.h" | |
41 | #include "avfilter.h" | |
42 | #include "formats.h" | |
43 | #include "internal.h" | |
44 | ||
45 | #define MAX_CHANNELS 63 | |
46 | ||
47 | /* pre-filter coefficients */ | |
48 | #define PRE_B0 1.53512485958697 | |
49 | #define PRE_B1 -2.69169618940638 | |
50 | #define PRE_B2 1.19839281085285 | |
51 | #define PRE_A1 -1.69065929318241 | |
52 | #define PRE_A2 0.73248077421585 | |
53 | ||
54 | /* RLB-filter coefficients */ | |
55 | #define RLB_B0 1.0 | |
56 | #define RLB_B1 -2.0 | |
57 | #define RLB_B2 1.0 | |
58 | #define RLB_A1 -1.99004745483398 | |
59 | #define RLB_A2 0.99007225036621 | |
60 | ||
61 | #define ABS_THRES -70 ///< silence gate: we discard anything below this absolute (LUFS) threshold | |
62 | #define ABS_UP_THRES 10 ///< upper loud limit to consider (ABS_THRES being the minimum) | |
63 | #define HIST_GRAIN 100 ///< defines histogram precision | |
64 | #define HIST_SIZE ((ABS_UP_THRES - ABS_THRES) * HIST_GRAIN + 1) | |
65 | ||
66 | /** | |
67 | * A histogram is an array of HIST_SIZE hist_entry storing all the energies | |
68 | * recorded (with an accuracy of 1/HIST_GRAIN) of the loudnesses from ABS_THRES | |
69 | * (at 0) to ABS_UP_THRES (at HIST_SIZE-1). | |
70 | * This fixed-size system avoids the need of a list of energies growing | |
71 | * infinitely over the time and is thus more scalable. | |
72 | */ | |
73 | struct hist_entry { | |
74 | int count; ///< how many times the corresponding value occurred | |
75 | double energy; ///< E = 10^((L + 0.691) / 10) | |
76 | double loudness; ///< L = -0.691 + 10 * log10(E) | |
77 | }; | |
78 | ||
79 | struct integrator { | |
80 | double *cache[MAX_CHANNELS]; ///< window of filtered samples (N ms) | |
81 | int cache_pos; ///< focus on the last added bin in the cache array | |
82 | double sum[MAX_CHANNELS]; ///< sum of the last N ms filtered samples (cache content) | |
83 | int filled; ///< 1 if the cache is completely filled, 0 otherwise | |
84 | double rel_threshold; ///< relative threshold | |
85 | double sum_kept_powers; ///< sum of the powers (weighted sums) above absolute threshold | |
86 | int nb_kept_powers; ///< number of sum above absolute threshold | |
87 | struct hist_entry *histogram; ///< histogram of the powers, used to compute LRA and I | |
88 | }; | |
89 | ||
90 | struct rect { int x, y, w, h; }; | |
91 | ||
92 | typedef struct { | |
93 | const AVClass *class; ///< AVClass context for log and options purpose | |
94 | ||
95 | /* peak metering */ | |
96 | int peak_mode; ///< enabled peak modes | |
97 | double *true_peaks; ///< true peaks per channel | |
98 | double *sample_peaks; ///< sample peaks per channel | |
99 | double *true_peaks_per_frame; ///< true peaks in a frame per channel | |
100 | #if CONFIG_SWRESAMPLE | |
101 | SwrContext *swr_ctx; ///< over-sampling context for true peak metering | |
102 | double *swr_buf; ///< resampled audio data for true peak metering | |
103 | int swr_linesize; | |
104 | #endif | |
105 | ||
106 | /* video */ | |
107 | int do_video; ///< 1 if video output enabled, 0 otherwise | |
108 | int w, h; ///< size of the video output | |
109 | struct rect text; ///< rectangle for the LU legend on the left | |
110 | struct rect graph; ///< rectangle for the main graph in the center | |
111 | struct rect gauge; ///< rectangle for the gauge on the right | |
112 | AVFrame *outpicref; ///< output picture reference, updated regularly | |
113 | int meter; ///< select a EBU mode between +9 and +18 | |
114 | int scale_range; ///< the range of LU values according to the meter | |
115 | int y_zero_lu; ///< the y value (pixel position) for 0 LU | |
116 | int *y_line_ref; ///< y reference values for drawing the LU lines in the graph and the gauge | |
117 | ||
118 | /* audio */ | |
119 | int nb_channels; ///< number of channels in the input | |
120 | double *ch_weighting; ///< channel weighting mapping | |
121 | int sample_count; ///< sample count used for refresh frequency, reset at refresh | |
122 | ||
123 | /* Filter caches. | |
124 | * The mult by 3 in the following is for X[i], X[i-1] and X[i-2] */ | |
125 | double x[MAX_CHANNELS * 3]; ///< 3 input samples cache for each channel | |
126 | double y[MAX_CHANNELS * 3]; ///< 3 pre-filter samples cache for each channel | |
127 | double z[MAX_CHANNELS * 3]; ///< 3 RLB-filter samples cache for each channel | |
128 | ||
129 | #define I400_BINS (48000 * 4 / 10) | |
130 | #define I3000_BINS (48000 * 3) | |
131 | struct integrator i400; ///< 400ms integrator, used for Momentary loudness (M), and Integrated loudness (I) | |
132 | struct integrator i3000; ///< 3s integrator, used for Short term loudness (S), and Loudness Range (LRA) | |
133 | ||
134 | /* I and LRA specific */ | |
135 | double integrated_loudness; ///< integrated loudness in LUFS (I) | |
136 | double loudness_range; ///< loudness range in LU (LRA) | |
137 | double lra_low, lra_high; ///< low and high LRA values | |
138 | ||
139 | /* misc */ | |
140 | int loglevel; ///< log level for frame logging | |
141 | int metadata; ///< whether or not to inject loudness results in frames | |
142 | } EBUR128Context; | |
143 | ||
144 | enum { | |
145 | PEAK_MODE_NONE = 0, | |
146 | PEAK_MODE_SAMPLES_PEAKS = 1<<1, | |
147 | PEAK_MODE_TRUE_PEAKS = 1<<2, | |
148 | }; | |
149 | ||
150 | #define OFFSET(x) offsetof(EBUR128Context, x) | |
151 | #define A AV_OPT_FLAG_AUDIO_PARAM | |
152 | #define V AV_OPT_FLAG_VIDEO_PARAM | |
153 | #define F AV_OPT_FLAG_FILTERING_PARAM | |
154 | static const AVOption ebur128_options[] = { | |
155 | { "video", "set video output", OFFSET(do_video), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, V|F }, | |
156 | { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x480"}, 0, 0, V|F }, | |
157 | { "meter", "set scale meter (+9 to +18)", OFFSET(meter), AV_OPT_TYPE_INT, {.i64 = 9}, 9, 18, V|F }, | |
158 | { "framelog", "force frame logging level", OFFSET(loglevel), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, A|V|F, "level" }, | |
159 | { "info", "information logging level", 0, AV_OPT_TYPE_CONST, {.i64 = AV_LOG_INFO}, INT_MIN, INT_MAX, A|V|F, "level" }, | |
160 | { "verbose", "verbose logging level", 0, AV_OPT_TYPE_CONST, {.i64 = AV_LOG_VERBOSE}, INT_MIN, INT_MAX, A|V|F, "level" }, | |
161 | { "metadata", "inject metadata in the filtergraph", OFFSET(metadata), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, A|V|F }, | |
162 | { "peak", "set peak mode", OFFSET(peak_mode), AV_OPT_TYPE_FLAGS, {.i64 = PEAK_MODE_NONE}, 0, INT_MAX, A|F, "mode" }, | |
163 | { "none", "disable any peak mode", 0, AV_OPT_TYPE_CONST, {.i64 = PEAK_MODE_NONE}, INT_MIN, INT_MAX, A|F, "mode" }, | |
164 | { "sample", "enable peak-sample mode", 0, AV_OPT_TYPE_CONST, {.i64 = PEAK_MODE_SAMPLES_PEAKS}, INT_MIN, INT_MAX, A|F, "mode" }, | |
165 | { "true", "enable true-peak mode", 0, AV_OPT_TYPE_CONST, {.i64 = PEAK_MODE_TRUE_PEAKS}, INT_MIN, INT_MAX, A|F, "mode" }, | |
166 | { NULL }, | |
167 | }; | |
168 | ||
169 | AVFILTER_DEFINE_CLASS(ebur128); | |
170 | ||
171 | static const uint8_t graph_colors[] = { | |
172 | 0xdd, 0x66, 0x66, // value above 0LU non reached | |
173 | 0x66, 0x66, 0xdd, // value below 0LU non reached | |
174 | 0x96, 0x33, 0x33, // value above 0LU reached | |
175 | 0x33, 0x33, 0x96, // value below 0LU reached | |
176 | 0xdd, 0x96, 0x96, // value above 0LU line non reached | |
177 | 0x96, 0x96, 0xdd, // value below 0LU line non reached | |
178 | 0xdd, 0x33, 0x33, // value above 0LU line reached | |
179 | 0x33, 0x33, 0xdd, // value below 0LU line reached | |
180 | }; | |
181 | ||
182 | static const uint8_t *get_graph_color(const EBUR128Context *ebur128, int v, int y) | |
183 | { | |
184 | const int below0 = y > ebur128->y_zero_lu; | |
185 | const int reached = y >= v; | |
186 | const int line = ebur128->y_line_ref[y] || y == ebur128->y_zero_lu; | |
187 | const int colorid = 4*line + 2*reached + below0; | |
188 | return graph_colors + 3*colorid; | |
189 | } | |
190 | ||
191 | static inline int lu_to_y(const EBUR128Context *ebur128, double v) | |
192 | { | |
193 | v += 2 * ebur128->meter; // make it in range [0;...] | |
194 | v = av_clipf(v, 0, ebur128->scale_range); // make sure it's in the graph scale | |
195 | v = ebur128->scale_range - v; // invert value (y=0 is on top) | |
196 | return v * ebur128->graph.h / ebur128->scale_range; // rescale from scale range to px height | |
197 | } | |
198 | ||
199 | #define FONT8 0 | |
200 | #define FONT16 1 | |
201 | ||
202 | static const uint8_t font_colors[] = { | |
203 | 0xdd, 0xdd, 0x00, | |
204 | 0x00, 0x96, 0x96, | |
205 | }; | |
206 | ||
207 | static void drawtext(AVFrame *pic, int x, int y, int ftid, const uint8_t *color, const char *fmt, ...) | |
208 | { | |
209 | int i; | |
210 | char buf[128] = {0}; | |
211 | const uint8_t *font; | |
212 | int font_height; | |
213 | va_list vl; | |
214 | ||
215 | if (ftid == FONT16) font = avpriv_vga16_font, font_height = 16; | |
216 | else if (ftid == FONT8) font = avpriv_cga_font, font_height = 8; | |
217 | else return; | |
218 | ||
219 | va_start(vl, fmt); | |
220 | vsnprintf(buf, sizeof(buf), fmt, vl); | |
221 | va_end(vl); | |
222 | ||
223 | for (i = 0; buf[i]; i++) { | |
224 | int char_y, mask; | |
225 | uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8)*3; | |
226 | ||
227 | for (char_y = 0; char_y < font_height; char_y++) { | |
228 | for (mask = 0x80; mask; mask >>= 1) { | |
229 | if (font[buf[i] * font_height + char_y] & mask) | |
230 | memcpy(p, color, 3); | |
231 | else | |
232 | memcpy(p, "\x00\x00\x00", 3); | |
233 | p += 3; | |
234 | } | |
235 | p += pic->linesize[0] - 8*3; | |
236 | } | |
237 | } | |
238 | } | |
239 | ||
240 | static void drawline(AVFrame *pic, int x, int y, int len, int step) | |
241 | { | |
242 | int i; | |
243 | uint8_t *p = pic->data[0] + y*pic->linesize[0] + x*3; | |
244 | ||
245 | for (i = 0; i < len; i++) { | |
246 | memcpy(p, "\x00\xff\x00", 3); | |
247 | p += step; | |
248 | } | |
249 | } | |
250 | ||
251 | static int config_video_output(AVFilterLink *outlink) | |
252 | { | |
253 | int i, x, y; | |
254 | uint8_t *p; | |
255 | AVFilterContext *ctx = outlink->src; | |
256 | EBUR128Context *ebur128 = ctx->priv; | |
257 | AVFrame *outpicref; | |
258 | ||
259 | /* check if there is enough space to represent everything decently */ | |
260 | if (ebur128->w < 640 || ebur128->h < 480) { | |
261 | av_log(ctx, AV_LOG_ERROR, "Video size %dx%d is too small, " | |
262 | "minimum size is 640x480\n", ebur128->w, ebur128->h); | |
263 | return AVERROR(EINVAL); | |
264 | } | |
265 | outlink->w = ebur128->w; | |
266 | outlink->h = ebur128->h; | |
267 | ||
268 | #define PAD 8 | |
269 | ||
270 | /* configure text area position and size */ | |
271 | ebur128->text.x = PAD; | |
272 | ebur128->text.y = 40; | |
273 | ebur128->text.w = 3 * 8; // 3 characters | |
274 | ebur128->text.h = ebur128->h - PAD - ebur128->text.y; | |
275 | ||
276 | /* configure gauge position and size */ | |
277 | ebur128->gauge.w = 20; | |
278 | ebur128->gauge.h = ebur128->text.h; | |
279 | ebur128->gauge.x = ebur128->w - PAD - ebur128->gauge.w; | |
280 | ebur128->gauge.y = ebur128->text.y; | |
281 | ||
282 | /* configure graph position and size */ | |
283 | ebur128->graph.x = ebur128->text.x + ebur128->text.w + PAD; | |
284 | ebur128->graph.y = ebur128->gauge.y; | |
285 | ebur128->graph.w = ebur128->gauge.x - ebur128->graph.x - PAD; | |
286 | ebur128->graph.h = ebur128->gauge.h; | |
287 | ||
288 | /* graph and gauge share the LU-to-pixel code */ | |
289 | av_assert0(ebur128->graph.h == ebur128->gauge.h); | |
290 | ||
291 | /* prepare the initial picref buffer */ | |
292 | av_frame_free(&ebur128->outpicref); | |
293 | ebur128->outpicref = outpicref = | |
294 | ff_get_video_buffer(outlink, outlink->w, outlink->h); | |
295 | if (!outpicref) | |
296 | return AVERROR(ENOMEM); | |
297 | outlink->sample_aspect_ratio = (AVRational){1,1}; | |
298 | ||
299 | /* init y references values (to draw LU lines) */ | |
300 | ebur128->y_line_ref = av_calloc(ebur128->graph.h + 1, sizeof(*ebur128->y_line_ref)); | |
301 | if (!ebur128->y_line_ref) | |
302 | return AVERROR(ENOMEM); | |
303 | ||
304 | /* black background */ | |
305 | memset(outpicref->data[0], 0, ebur128->h * outpicref->linesize[0]); | |
306 | ||
307 | /* draw LU legends */ | |
308 | drawtext(outpicref, PAD, PAD+16, FONT8, font_colors+3, " LU"); | |
309 | for (i = ebur128->meter; i >= -ebur128->meter * 2; i--) { | |
310 | y = lu_to_y(ebur128, i); | |
311 | x = PAD + (i < 10 && i > -10) * 8; | |
312 | ebur128->y_line_ref[y] = i; | |
313 | y -= 4; // -4 to center vertically | |
314 | drawtext(outpicref, x, y + ebur128->graph.y, FONT8, font_colors+3, | |
315 | "%c%d", i < 0 ? '-' : i > 0 ? '+' : ' ', FFABS(i)); | |
316 | } | |
317 | ||
318 | /* draw graph */ | |
319 | ebur128->y_zero_lu = lu_to_y(ebur128, 0); | |
320 | p = outpicref->data[0] + ebur128->graph.y * outpicref->linesize[0] | |
321 | + ebur128->graph.x * 3; | |
322 | for (y = 0; y < ebur128->graph.h; y++) { | |
323 | const uint8_t *c = get_graph_color(ebur128, INT_MAX, y); | |
324 | ||
325 | for (x = 0; x < ebur128->graph.w; x++) | |
326 | memcpy(p + x*3, c, 3); | |
327 | p += outpicref->linesize[0]; | |
328 | } | |
329 | ||
330 | /* draw fancy rectangles around the graph and the gauge */ | |
331 | #define DRAW_RECT(r) do { \ | |
332 | drawline(outpicref, r.x, r.y - 1, r.w, 3); \ | |
333 | drawline(outpicref, r.x, r.y + r.h, r.w, 3); \ | |
334 | drawline(outpicref, r.x - 1, r.y, r.h, outpicref->linesize[0]); \ | |
335 | drawline(outpicref, r.x + r.w, r.y, r.h, outpicref->linesize[0]); \ | |
336 | } while (0) | |
337 | DRAW_RECT(ebur128->graph); | |
338 | DRAW_RECT(ebur128->gauge); | |
339 | ||
340 | outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | static int config_audio_input(AVFilterLink *inlink) | |
346 | { | |
347 | AVFilterContext *ctx = inlink->dst; | |
348 | EBUR128Context *ebur128 = ctx->priv; | |
349 | ||
350 | /* Force 100ms framing in case of metadata injection: the frames must have | |
351 | * a granularity of the window overlap to be accurately exploited. | |
352 | * As for the true peaks mode, it just simplifies the resampling buffer | |
353 | * allocation and the lookup in it (since sample buffers differ in size, it | |
354 | * can be more complex to integrate in the one-sample loop of | |
355 | * filter_frame()). */ | |
356 | if (ebur128->metadata || (ebur128->peak_mode & PEAK_MODE_TRUE_PEAKS)) | |
357 | inlink->min_samples = | |
358 | inlink->max_samples = | |
359 | inlink->partial_buf_size = inlink->sample_rate / 10; | |
360 | return 0; | |
361 | } | |
362 | ||
363 | static int config_audio_output(AVFilterLink *outlink) | |
364 | { | |
365 | int i; | |
366 | AVFilterContext *ctx = outlink->src; | |
367 | EBUR128Context *ebur128 = ctx->priv; | |
368 | const int nb_channels = av_get_channel_layout_nb_channels(outlink->channel_layout); | |
369 | ||
370 | #define BACK_MASK (AV_CH_BACK_LEFT |AV_CH_BACK_CENTER |AV_CH_BACK_RIGHT| \ | |
371 | AV_CH_TOP_BACK_LEFT|AV_CH_TOP_BACK_CENTER|AV_CH_TOP_BACK_RIGHT| \ | |
372 | AV_CH_SIDE_LEFT |AV_CH_SIDE_RIGHT| \ | |
373 | AV_CH_SURROUND_DIRECT_LEFT |AV_CH_SURROUND_DIRECT_RIGHT) | |
374 | ||
375 | ebur128->nb_channels = nb_channels; | |
376 | ebur128->ch_weighting = av_calloc(nb_channels, sizeof(*ebur128->ch_weighting)); | |
377 | if (!ebur128->ch_weighting) | |
378 | return AVERROR(ENOMEM); | |
379 | ||
380 | for (i = 0; i < nb_channels; i++) { | |
381 | /* channel weighting */ | |
382 | const uint16_t chl = av_channel_layout_extract_channel(outlink->channel_layout, i); | |
383 | if (chl & (AV_CH_LOW_FREQUENCY|AV_CH_LOW_FREQUENCY_2)) { | |
384 | ebur128->ch_weighting[i] = 0; | |
385 | } else if (chl & BACK_MASK) { | |
386 | ebur128->ch_weighting[i] = 1.41; | |
387 | } else { | |
388 | ebur128->ch_weighting[i] = 1.0; | |
389 | } | |
390 | ||
391 | if (!ebur128->ch_weighting[i]) | |
392 | continue; | |
393 | ||
394 | /* bins buffer for the two integration window (400ms and 3s) */ | |
395 | ebur128->i400.cache[i] = av_calloc(I400_BINS, sizeof(*ebur128->i400.cache[0])); | |
396 | ebur128->i3000.cache[i] = av_calloc(I3000_BINS, sizeof(*ebur128->i3000.cache[0])); | |
397 | if (!ebur128->i400.cache[i] || !ebur128->i3000.cache[i]) | |
398 | return AVERROR(ENOMEM); | |
399 | } | |
400 | ||
401 | outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; | |
402 | ||
403 | #if CONFIG_SWRESAMPLE | |
404 | if (ebur128->peak_mode & PEAK_MODE_TRUE_PEAKS) { | |
405 | int ret; | |
406 | ||
407 | ebur128->swr_buf = av_malloc_array(nb_channels, 19200 * sizeof(double)); | |
408 | ebur128->true_peaks = av_calloc(nb_channels, sizeof(*ebur128->true_peaks)); | |
409 | ebur128->true_peaks_per_frame = av_calloc(nb_channels, sizeof(*ebur128->true_peaks_per_frame)); | |
410 | ebur128->swr_ctx = swr_alloc(); | |
411 | if (!ebur128->swr_buf || !ebur128->true_peaks || | |
412 | !ebur128->true_peaks_per_frame || !ebur128->swr_ctx) | |
413 | return AVERROR(ENOMEM); | |
414 | ||
415 | av_opt_set_int(ebur128->swr_ctx, "in_channel_layout", outlink->channel_layout, 0); | |
416 | av_opt_set_int(ebur128->swr_ctx, "in_sample_rate", outlink->sample_rate, 0); | |
417 | av_opt_set_sample_fmt(ebur128->swr_ctx, "in_sample_fmt", outlink->format, 0); | |
418 | ||
419 | av_opt_set_int(ebur128->swr_ctx, "out_channel_layout", outlink->channel_layout, 0); | |
420 | av_opt_set_int(ebur128->swr_ctx, "out_sample_rate", 192000, 0); | |
421 | av_opt_set_sample_fmt(ebur128->swr_ctx, "out_sample_fmt", outlink->format, 0); | |
422 | ||
423 | ret = swr_init(ebur128->swr_ctx); | |
424 | if (ret < 0) | |
425 | return ret; | |
426 | } | |
427 | #endif | |
428 | ||
429 | if (ebur128->peak_mode & PEAK_MODE_SAMPLES_PEAKS) { | |
430 | ebur128->sample_peaks = av_calloc(nb_channels, sizeof(*ebur128->sample_peaks)); | |
431 | if (!ebur128->sample_peaks) | |
432 | return AVERROR(ENOMEM); | |
433 | } | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | #define ENERGY(loudness) (pow(10, ((loudness) + 0.691) / 10.)) | |
439 | #define LOUDNESS(energy) (-0.691 + 10 * log10(energy)) | |
440 | #define DBFS(energy) (20 * log10(energy)) | |
441 | ||
442 | static struct hist_entry *get_histogram(void) | |
443 | { | |
444 | int i; | |
445 | struct hist_entry *h = av_calloc(HIST_SIZE, sizeof(*h)); | |
446 | ||
447 | if (!h) | |
448 | return NULL; | |
449 | for (i = 0; i < HIST_SIZE; i++) { | |
450 | h[i].loudness = i / (double)HIST_GRAIN + ABS_THRES; | |
451 | h[i].energy = ENERGY(h[i].loudness); | |
452 | } | |
453 | return h; | |
454 | } | |
455 | ||
456 | static av_cold int init(AVFilterContext *ctx) | |
457 | { | |
458 | EBUR128Context *ebur128 = ctx->priv; | |
459 | AVFilterPad pad; | |
460 | ||
461 | if (ebur128->loglevel != AV_LOG_INFO && | |
462 | ebur128->loglevel != AV_LOG_VERBOSE) { | |
463 | if (ebur128->do_video || ebur128->metadata) | |
464 | ebur128->loglevel = AV_LOG_VERBOSE; | |
465 | else | |
466 | ebur128->loglevel = AV_LOG_INFO; | |
467 | } | |
468 | ||
469 | if (!CONFIG_SWRESAMPLE && (ebur128->peak_mode & PEAK_MODE_TRUE_PEAKS)) { | |
470 | av_log(ctx, AV_LOG_ERROR, | |
471 | "True-peak mode requires libswresample to be performed\n"); | |
472 | return AVERROR(EINVAL); | |
473 | } | |
474 | ||
475 | // if meter is +9 scale, scale range is from -18 LU to +9 LU (or 3*9) | |
476 | // if meter is +18 scale, scale range is from -36 LU to +18 LU (or 3*18) | |
477 | ebur128->scale_range = 3 * ebur128->meter; | |
478 | ||
479 | ebur128->i400.histogram = get_histogram(); | |
480 | ebur128->i3000.histogram = get_histogram(); | |
481 | if (!ebur128->i400.histogram || !ebur128->i3000.histogram) | |
482 | return AVERROR(ENOMEM); | |
483 | ||
484 | ebur128->integrated_loudness = ABS_THRES; | |
485 | ebur128->loudness_range = 0; | |
486 | ||
487 | /* insert output pads */ | |
488 | if (ebur128->do_video) { | |
489 | pad = (AVFilterPad){ | |
490 | .name = av_strdup("out0"), | |
491 | .type = AVMEDIA_TYPE_VIDEO, | |
492 | .config_props = config_video_output, | |
493 | }; | |
494 | if (!pad.name) | |
495 | return AVERROR(ENOMEM); | |
496 | ff_insert_outpad(ctx, 0, &pad); | |
497 | } | |
498 | pad = (AVFilterPad){ | |
499 | .name = av_asprintf("out%d", ebur128->do_video), | |
500 | .type = AVMEDIA_TYPE_AUDIO, | |
501 | .config_props = config_audio_output, | |
502 | }; | |
503 | if (!pad.name) | |
504 | return AVERROR(ENOMEM); | |
505 | ff_insert_outpad(ctx, ebur128->do_video, &pad); | |
506 | ||
507 | /* summary */ | |
508 | av_log(ctx, AV_LOG_VERBOSE, "EBU +%d scale\n", ebur128->meter); | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | #define HIST_POS(power) (int)(((power) - ABS_THRES) * HIST_GRAIN) | |
514 | ||
515 | /* loudness and power should be set such as loudness = -0.691 + | |
516 | * 10*log10(power), we just avoid doing that calculus two times */ | |
517 | static int gate_update(struct integrator *integ, double power, | |
518 | double loudness, int gate_thres) | |
519 | { | |
520 | int ipower; | |
521 | double relative_threshold; | |
522 | int gate_hist_pos; | |
523 | ||
524 | /* update powers histograms by incrementing current power count */ | |
525 | ipower = av_clip(HIST_POS(loudness), 0, HIST_SIZE - 1); | |
526 | integ->histogram[ipower].count++; | |
527 | ||
528 | /* compute relative threshold and get its position in the histogram */ | |
529 | integ->sum_kept_powers += power; | |
530 | integ->nb_kept_powers++; | |
531 | relative_threshold = integ->sum_kept_powers / integ->nb_kept_powers; | |
532 | if (!relative_threshold) | |
533 | relative_threshold = 1e-12; | |
534 | integ->rel_threshold = LOUDNESS(relative_threshold) + gate_thres; | |
535 | gate_hist_pos = av_clip(HIST_POS(integ->rel_threshold), 0, HIST_SIZE - 1); | |
536 | ||
537 | return gate_hist_pos; | |
538 | } | |
539 | ||
540 | static int filter_frame(AVFilterLink *inlink, AVFrame *insamples) | |
541 | { | |
542 | int i, ch, idx_insample; | |
543 | AVFilterContext *ctx = inlink->dst; | |
544 | EBUR128Context *ebur128 = ctx->priv; | |
545 | const int nb_channels = ebur128->nb_channels; | |
546 | const int nb_samples = insamples->nb_samples; | |
547 | const double *samples = (double *)insamples->data[0]; | |
548 | AVFrame *pic = ebur128->outpicref; | |
549 | ||
550 | #if CONFIG_SWRESAMPLE | |
551 | if (ebur128->peak_mode & PEAK_MODE_TRUE_PEAKS) { | |
552 | const double *swr_samples = ebur128->swr_buf; | |
553 | int ret = swr_convert(ebur128->swr_ctx, (uint8_t**)&ebur128->swr_buf, 19200, | |
554 | (const uint8_t **)insamples->data, nb_samples); | |
555 | if (ret < 0) | |
556 | return ret; | |
557 | for (ch = 0; ch < nb_channels; ch++) | |
558 | ebur128->true_peaks_per_frame[ch] = 0.0; | |
559 | for (idx_insample = 0; idx_insample < ret; idx_insample++) { | |
560 | for (ch = 0; ch < nb_channels; ch++) { | |
561 | ebur128->true_peaks[ch] = FFMAX(ebur128->true_peaks[ch], FFABS(*swr_samples)); | |
562 | ebur128->true_peaks_per_frame[ch] = FFMAX(ebur128->true_peaks_per_frame[ch], | |
563 | FFABS(*swr_samples)); | |
564 | swr_samples++; | |
565 | } | |
566 | } | |
567 | } | |
568 | #endif | |
569 | ||
570 | for (idx_insample = 0; idx_insample < nb_samples; idx_insample++) { | |
571 | const int bin_id_400 = ebur128->i400.cache_pos; | |
572 | const int bin_id_3000 = ebur128->i3000.cache_pos; | |
573 | ||
574 | #define MOVE_TO_NEXT_CACHED_ENTRY(time) do { \ | |
575 | ebur128->i##time.cache_pos++; \ | |
576 | if (ebur128->i##time.cache_pos == I##time##_BINS) { \ | |
577 | ebur128->i##time.filled = 1; \ | |
578 | ebur128->i##time.cache_pos = 0; \ | |
579 | } \ | |
580 | } while (0) | |
581 | ||
582 | MOVE_TO_NEXT_CACHED_ENTRY(400); | |
583 | MOVE_TO_NEXT_CACHED_ENTRY(3000); | |
584 | ||
585 | for (ch = 0; ch < nb_channels; ch++) { | |
586 | double bin; | |
587 | ||
588 | if (ebur128->peak_mode & PEAK_MODE_SAMPLES_PEAKS) | |
589 | ebur128->sample_peaks[ch] = FFMAX(ebur128->sample_peaks[ch], FFABS(*samples)); | |
590 | ||
591 | ebur128->x[ch * 3] = *samples++; // set X[i] | |
592 | ||
593 | if (!ebur128->ch_weighting[ch]) | |
594 | continue; | |
595 | ||
596 | /* Y[i] = X[i]*b0 + X[i-1]*b1 + X[i-2]*b2 - Y[i-1]*a1 - Y[i-2]*a2 */ | |
597 | #define FILTER(Y, X, name) do { \ | |
598 | double *dst = ebur128->Y + ch*3; \ | |
599 | double *src = ebur128->X + ch*3; \ | |
600 | dst[2] = dst[1]; \ | |
601 | dst[1] = dst[0]; \ | |
602 | dst[0] = src[0]*name##_B0 + src[1]*name##_B1 + src[2]*name##_B2 \ | |
603 | - dst[1]*name##_A1 - dst[2]*name##_A2; \ | |
604 | } while (0) | |
605 | ||
606 | // TODO: merge both filters in one? | |
607 | FILTER(y, x, PRE); // apply pre-filter | |
608 | ebur128->x[ch * 3 + 2] = ebur128->x[ch * 3 + 1]; | |
609 | ebur128->x[ch * 3 + 1] = ebur128->x[ch * 3 ]; | |
610 | FILTER(z, y, RLB); // apply RLB-filter | |
611 | ||
612 | bin = ebur128->z[ch * 3] * ebur128->z[ch * 3]; | |
613 | ||
614 | /* add the new value, and limit the sum to the cache size (400ms or 3s) | |
615 | * by removing the oldest one */ | |
616 | ebur128->i400.sum [ch] = ebur128->i400.sum [ch] + bin - ebur128->i400.cache [ch][bin_id_400]; | |
617 | ebur128->i3000.sum[ch] = ebur128->i3000.sum[ch] + bin - ebur128->i3000.cache[ch][bin_id_3000]; | |
618 | ||
619 | /* override old cache entry with the new value */ | |
620 | ebur128->i400.cache [ch][bin_id_400 ] = bin; | |
621 | ebur128->i3000.cache[ch][bin_id_3000] = bin; | |
622 | } | |
623 | ||
624 | /* For integrated loudness, gating blocks are 400ms long with 75% | |
625 | * overlap (see BS.1770-2 p5), so a re-computation is needed each 100ms | |
626 | * (4800 samples at 48kHz). */ | |
627 | if (++ebur128->sample_count == 4800) { | |
628 | double loudness_400, loudness_3000; | |
629 | double power_400 = 1e-12, power_3000 = 1e-12; | |
630 | AVFilterLink *outlink = ctx->outputs[0]; | |
631 | const int64_t pts = insamples->pts + | |
632 | av_rescale_q(idx_insample, (AVRational){ 1, inlink->sample_rate }, | |
633 | outlink->time_base); | |
634 | ||
635 | ebur128->sample_count = 0; | |
636 | ||
637 | #define COMPUTE_LOUDNESS(m, time) do { \ | |
638 | if (ebur128->i##time.filled) { \ | |
639 | /* weighting sum of the last <time> ms */ \ | |
640 | for (ch = 0; ch < nb_channels; ch++) \ | |
641 | power_##time += ebur128->ch_weighting[ch] * ebur128->i##time.sum[ch]; \ | |
642 | power_##time /= I##time##_BINS; \ | |
643 | } \ | |
644 | loudness_##time = LOUDNESS(power_##time); \ | |
645 | } while (0) | |
646 | ||
647 | COMPUTE_LOUDNESS(M, 400); | |
648 | COMPUTE_LOUDNESS(S, 3000); | |
649 | ||
650 | /* Integrated loudness */ | |
651 | #define I_GATE_THRES -10 // initially defined to -8 LU in the first EBU standard | |
652 | ||
653 | if (loudness_400 >= ABS_THRES) { | |
654 | double integrated_sum = 0; | |
655 | int nb_integrated = 0; | |
656 | int gate_hist_pos = gate_update(&ebur128->i400, power_400, | |
657 | loudness_400, I_GATE_THRES); | |
658 | ||
659 | /* compute integrated loudness by summing the histogram values | |
660 | * above the relative threshold */ | |
661 | for (i = gate_hist_pos; i < HIST_SIZE; i++) { | |
662 | const int nb_v = ebur128->i400.histogram[i].count; | |
663 | nb_integrated += nb_v; | |
664 | integrated_sum += nb_v * ebur128->i400.histogram[i].energy; | |
665 | } | |
666 | if (nb_integrated) | |
667 | ebur128->integrated_loudness = LOUDNESS(integrated_sum / nb_integrated); | |
668 | } | |
669 | ||
670 | /* LRA */ | |
671 | #define LRA_GATE_THRES -20 | |
672 | #define LRA_LOWER_PRC 10 | |
673 | #define LRA_HIGHER_PRC 95 | |
674 | ||
675 | /* XXX: example code in EBU 3342 is ">=" but formula in BS.1770 | |
676 | * specs is ">" */ | |
677 | if (loudness_3000 >= ABS_THRES) { | |
678 | int nb_powers = 0; | |
679 | int gate_hist_pos = gate_update(&ebur128->i3000, power_3000, | |
680 | loudness_3000, LRA_GATE_THRES); | |
681 | ||
682 | for (i = gate_hist_pos; i < HIST_SIZE; i++) | |
683 | nb_powers += ebur128->i3000.histogram[i].count; | |
684 | if (nb_powers) { | |
685 | int n, nb_pow; | |
686 | ||
687 | /* get lower loudness to consider */ | |
688 | n = 0; | |
689 | nb_pow = LRA_LOWER_PRC * nb_powers / 100. + 0.5; | |
690 | for (i = gate_hist_pos; i < HIST_SIZE; i++) { | |
691 | n += ebur128->i3000.histogram[i].count; | |
692 | if (n >= nb_pow) { | |
693 | ebur128->lra_low = ebur128->i3000.histogram[i].loudness; | |
694 | break; | |
695 | } | |
696 | } | |
697 | ||
698 | /* get higher loudness to consider */ | |
699 | n = nb_powers; | |
700 | nb_pow = LRA_HIGHER_PRC * nb_powers / 100. + 0.5; | |
701 | for (i = HIST_SIZE - 1; i >= 0; i--) { | |
702 | n -= ebur128->i3000.histogram[i].count; | |
703 | if (n < nb_pow) { | |
704 | ebur128->lra_high = ebur128->i3000.histogram[i].loudness; | |
705 | break; | |
706 | } | |
707 | } | |
708 | ||
709 | // XXX: show low & high on the graph? | |
710 | ebur128->loudness_range = ebur128->lra_high - ebur128->lra_low; | |
711 | } | |
712 | } | |
713 | ||
714 | #define LOG_FMT "M:%6.1f S:%6.1f I:%6.1f LUFS LRA:%6.1f LU" | |
715 | ||
716 | /* push one video frame */ | |
717 | if (ebur128->do_video) { | |
718 | int x, y, ret; | |
719 | uint8_t *p; | |
720 | ||
721 | const int y_loudness_lu_graph = lu_to_y(ebur128, loudness_3000 + 23); | |
722 | const int y_loudness_lu_gauge = lu_to_y(ebur128, loudness_400 + 23); | |
723 | ||
724 | /* draw the graph using the short-term loudness */ | |
725 | p = pic->data[0] + ebur128->graph.y*pic->linesize[0] + ebur128->graph.x*3; | |
726 | for (y = 0; y < ebur128->graph.h; y++) { | |
727 | const uint8_t *c = get_graph_color(ebur128, y_loudness_lu_graph, y); | |
728 | ||
729 | memmove(p, p + 3, (ebur128->graph.w - 1) * 3); | |
730 | memcpy(p + (ebur128->graph.w - 1) * 3, c, 3); | |
731 | p += pic->linesize[0]; | |
732 | } | |
733 | ||
734 | /* draw the gauge using the momentary loudness */ | |
735 | p = pic->data[0] + ebur128->gauge.y*pic->linesize[0] + ebur128->gauge.x*3; | |
736 | for (y = 0; y < ebur128->gauge.h; y++) { | |
737 | const uint8_t *c = get_graph_color(ebur128, y_loudness_lu_gauge, y); | |
738 | ||
739 | for (x = 0; x < ebur128->gauge.w; x++) | |
740 | memcpy(p + x*3, c, 3); | |
741 | p += pic->linesize[0]; | |
742 | } | |
743 | ||
744 | /* draw textual info */ | |
745 | drawtext(pic, PAD, PAD - PAD/2, FONT16, font_colors, | |
746 | LOG_FMT " ", // padding to erase trailing characters | |
747 | loudness_400, loudness_3000, | |
748 | ebur128->integrated_loudness, ebur128->loudness_range); | |
749 | ||
750 | /* set pts and push frame */ | |
751 | pic->pts = pts; | |
752 | ret = ff_filter_frame(outlink, av_frame_clone(pic)); | |
753 | if (ret < 0) | |
754 | return ret; | |
755 | } | |
756 | ||
757 | if (ebur128->metadata) { /* happens only once per filter_frame call */ | |
758 | char metabuf[128]; | |
759 | #define META_PREFIX "lavfi.r128." | |
760 | ||
761 | #define SET_META(name, var) do { \ | |
762 | snprintf(metabuf, sizeof(metabuf), "%.3f", var); \ | |
763 | av_dict_set(&insamples->metadata, name, metabuf, 0); \ | |
764 | } while (0) | |
765 | ||
766 | #define SET_META_PEAK(name, ptype) do { \ | |
767 | if (ebur128->peak_mode & PEAK_MODE_ ## ptype ## _PEAKS) { \ | |
768 | char key[64]; \ | |
769 | for (ch = 0; ch < nb_channels; ch++) { \ | |
770 | snprintf(key, sizeof(key), \ | |
771 | META_PREFIX AV_STRINGIFY(name) "_peaks_ch%d", ch); \ | |
772 | SET_META(key, ebur128->name##_peaks[ch]); \ | |
773 | } \ | |
774 | } \ | |
775 | } while (0) | |
776 | ||
777 | SET_META(META_PREFIX "M", loudness_400); | |
778 | SET_META(META_PREFIX "S", loudness_3000); | |
779 | SET_META(META_PREFIX "I", ebur128->integrated_loudness); | |
780 | SET_META(META_PREFIX "LRA", ebur128->loudness_range); | |
781 | SET_META(META_PREFIX "LRA.low", ebur128->lra_low); | |
782 | SET_META(META_PREFIX "LRA.high", ebur128->lra_high); | |
783 | ||
784 | SET_META_PEAK(sample, SAMPLES); | |
785 | SET_META_PEAK(true, TRUE); | |
786 | } | |
787 | ||
788 | av_log(ctx, ebur128->loglevel, "t: %-10s " LOG_FMT, | |
789 | av_ts2timestr(pts, &outlink->time_base), | |
790 | loudness_400, loudness_3000, | |
791 | ebur128->integrated_loudness, ebur128->loudness_range); | |
792 | ||
793 | #define PRINT_PEAKS(str, sp, ptype) do { \ | |
794 | if (ebur128->peak_mode & PEAK_MODE_ ## ptype ## _PEAKS) { \ | |
795 | av_log(ctx, ebur128->loglevel, " " str ":"); \ | |
796 | for (ch = 0; ch < nb_channels; ch++) \ | |
797 | av_log(ctx, ebur128->loglevel, " %5.1f", DBFS(sp[ch])); \ | |
798 | av_log(ctx, ebur128->loglevel, " dBFS"); \ | |
799 | } \ | |
800 | } while (0) | |
801 | ||
802 | PRINT_PEAKS("SPK", ebur128->sample_peaks, SAMPLES); | |
803 | PRINT_PEAKS("FTPK", ebur128->true_peaks_per_frame, TRUE); | |
804 | PRINT_PEAKS("TPK", ebur128->true_peaks, TRUE); | |
805 | av_log(ctx, ebur128->loglevel, "\n"); | |
806 | } | |
807 | } | |
808 | ||
809 | return ff_filter_frame(ctx->outputs[ebur128->do_video], insamples); | |
810 | } | |
811 | ||
812 | static int query_formats(AVFilterContext *ctx) | |
813 | { | |
814 | EBUR128Context *ebur128 = ctx->priv; | |
815 | AVFilterFormats *formats; | |
816 | AVFilterChannelLayouts *layouts; | |
817 | AVFilterLink *inlink = ctx->inputs[0]; | |
818 | AVFilterLink *outlink = ctx->outputs[0]; | |
819 | ||
820 | static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_NONE }; | |
821 | static const int input_srate[] = {48000, -1}; // ITU-R BS.1770 provides coeff only for 48kHz | |
822 | static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE }; | |
823 | ||
824 | /* set optional output video format */ | |
825 | if (ebur128->do_video) { | |
826 | formats = ff_make_format_list(pix_fmts); | |
827 | if (!formats) | |
828 | return AVERROR(ENOMEM); | |
829 | ff_formats_ref(formats, &outlink->in_formats); | |
830 | outlink = ctx->outputs[1]; | |
831 | } | |
832 | ||
833 | /* set input and output audio formats | |
834 | * Note: ff_set_common_* functions are not used because they affect all the | |
835 | * links, and thus break the video format negotiation */ | |
836 | formats = ff_make_format_list(sample_fmts); | |
837 | if (!formats) | |
838 | return AVERROR(ENOMEM); | |
839 | ff_formats_ref(formats, &inlink->out_formats); | |
840 | ff_formats_ref(formats, &outlink->in_formats); | |
841 | ||
842 | layouts = ff_all_channel_layouts(); | |
843 | if (!layouts) | |
844 | return AVERROR(ENOMEM); | |
845 | ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts); | |
846 | ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts); | |
847 | ||
848 | formats = ff_make_format_list(input_srate); | |
849 | if (!formats) | |
850 | return AVERROR(ENOMEM); | |
851 | ff_formats_ref(formats, &inlink->out_samplerates); | |
852 | ff_formats_ref(formats, &outlink->in_samplerates); | |
853 | ||
854 | return 0; | |
855 | } | |
856 | ||
857 | static av_cold void uninit(AVFilterContext *ctx) | |
858 | { | |
859 | int i; | |
860 | EBUR128Context *ebur128 = ctx->priv; | |
861 | ||
862 | av_log(ctx, AV_LOG_INFO, "Summary:\n\n" | |
863 | " Integrated loudness:\n" | |
864 | " I: %5.1f LUFS\n" | |
865 | " Threshold: %5.1f LUFS\n\n" | |
866 | " Loudness range:\n" | |
867 | " LRA: %5.1f LU\n" | |
868 | " Threshold: %5.1f LUFS\n" | |
869 | " LRA low: %5.1f LUFS\n" | |
870 | " LRA high: %5.1f LUFS", | |
871 | ebur128->integrated_loudness, ebur128->i400.rel_threshold, | |
872 | ebur128->loudness_range, ebur128->i3000.rel_threshold, | |
873 | ebur128->lra_low, ebur128->lra_high); | |
874 | ||
875 | #define PRINT_PEAK_SUMMARY(str, sp, ptype) do { \ | |
876 | int ch; \ | |
877 | double maxpeak; \ | |
878 | maxpeak = 0.0; \ | |
879 | if (ebur128->peak_mode & PEAK_MODE_ ## ptype ## _PEAKS) { \ | |
880 | for (ch = 0; ch < ebur128->nb_channels; ch++) \ | |
881 | maxpeak = FFMAX(maxpeak, sp[ch]); \ | |
882 | av_log(ctx, AV_LOG_INFO, "\n\n " str " peak:\n" \ | |
883 | " Peak: %5.1f dBFS", \ | |
884 | DBFS(maxpeak)); \ | |
885 | } \ | |
886 | } while (0) | |
887 | ||
888 | PRINT_PEAK_SUMMARY("Sample", ebur128->sample_peaks, SAMPLES); | |
889 | PRINT_PEAK_SUMMARY("True", ebur128->true_peaks, TRUE); | |
890 | av_log(ctx, AV_LOG_INFO, "\n"); | |
891 | ||
892 | av_freep(&ebur128->y_line_ref); | |
893 | av_freep(&ebur128->ch_weighting); | |
894 | av_freep(&ebur128->true_peaks); | |
895 | av_freep(&ebur128->sample_peaks); | |
896 | av_freep(&ebur128->true_peaks_per_frame); | |
897 | av_freep(&ebur128->i400.histogram); | |
898 | av_freep(&ebur128->i3000.histogram); | |
899 | for (i = 0; i < ebur128->nb_channels; i++) { | |
900 | av_freep(&ebur128->i400.cache[i]); | |
901 | av_freep(&ebur128->i3000.cache[i]); | |
902 | } | |
903 | for (i = 0; i < ctx->nb_outputs; i++) | |
904 | av_freep(&ctx->output_pads[i].name); | |
905 | av_frame_free(&ebur128->outpicref); | |
906 | #if CONFIG_SWRESAMPLE | |
907 | av_freep(&ebur128->swr_buf); | |
908 | swr_free(&ebur128->swr_ctx); | |
909 | #endif | |
910 | } | |
911 | ||
912 | static const AVFilterPad ebur128_inputs[] = { | |
913 | { | |
914 | .name = "default", | |
915 | .type = AVMEDIA_TYPE_AUDIO, | |
916 | .filter_frame = filter_frame, | |
917 | .config_props = config_audio_input, | |
918 | }, | |
919 | { NULL } | |
920 | }; | |
921 | ||
922 | AVFilter ff_af_ebur128 = { | |
923 | .name = "ebur128", | |
924 | .description = NULL_IF_CONFIG_SMALL("EBU R128 scanner."), | |
925 | .priv_size = sizeof(EBUR128Context), | |
926 | .init = init, | |
927 | .uninit = uninit, | |
928 | .query_formats = query_formats, | |
929 | .inputs = ebur128_inputs, | |
930 | .outputs = NULL, | |
931 | .priv_class = &ebur128_class, | |
932 | .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS, | |
933 | }; |