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1 /*
2  * Copyright (c) 2015 Paul B Mahol
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 #include "libavutil/avassert.h"
22 #include "libavutil/opt.h"
23 #include "libavutil/parseutils.h"
24 #include "avfilter.h"
25 #include "filters.h"
26 #include "formats.h"
27 #include "audio.h"
28 #include "video.h"
29 #include "internal.h"
30 
31 enum DisplayScale   { LINEAR, SQRT, CBRT, LOG, RLOG, NB_SCALES };
32 enum AmplitudeScale { ALINEAR, ALOG, NB_ASCALES };
33 enum SlideMode      { REPLACE, SCROLL, NB_SLIDES };
34 enum DisplayMode    { SINGLE, SEPARATE, NB_DMODES };
35 enum HistogramMode  { ABS, SIGN, NB_HMODES };
36 
37 typedef struct AudioHistogramContext {
38     const AVClass *class;
39     AVFrame *out;
40     int w, h;
41     AVRational frame_rate;
42     uint64_t *achistogram;
43     uint64_t *shistogram;
44     int ascale;
45     int scale;
46     float phisto;
47     int histogram_h;
48     int apos;
49     int ypos;
50     int slide;
51     int dmode;
52     int hmode;
53     int dchannels;
54     int count;
55     int frame_count;
56     float *combine_buffer;
57     AVFrame *in[101];
58     int first;
59     int nb_samples;
60 
61     int (*get_bin)(float in, int w);
62 } AudioHistogramContext;
63 
64 #define OFFSET(x) offsetof(AudioHistogramContext, x)
65 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
66 
67 static const AVOption ahistogram_options[] = {
68     { "dmode", "set method to display channels", OFFSET(dmode), AV_OPT_TYPE_INT, {.i64=SINGLE}, 0, NB_DMODES-1, FLAGS, "dmode" },
69         { "single", "all channels use single histogram", 0, AV_OPT_TYPE_CONST, {.i64=SINGLE},   0, 0, FLAGS, "dmode" },
70         { "separate", "each channel have own histogram", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "dmode" },
71     { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
72     { "r",    "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
73     { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="hd720"}, 0, 0, FLAGS },
74     { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="hd720"}, 0, 0, FLAGS },
75     { "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=LOG}, LINEAR, NB_SCALES-1, FLAGS, "scale" },
76         { "log",  "logarithmic",         0, AV_OPT_TYPE_CONST, {.i64=LOG},    0, 0, FLAGS, "scale" },
77         { "sqrt", "square root",         0, AV_OPT_TYPE_CONST, {.i64=SQRT},   0, 0, FLAGS, "scale" },
78         { "cbrt", "cubic root",          0, AV_OPT_TYPE_CONST, {.i64=CBRT},   0, 0, FLAGS, "scale" },
79         { "lin",  "linear",              0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },
80         { "rlog", "reverse logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=RLOG},   0, 0, FLAGS, "scale" },
81     { "ascale", "set amplitude scale", OFFSET(ascale), AV_OPT_TYPE_INT, {.i64=ALOG}, LINEAR, NB_ASCALES-1, FLAGS, "ascale" },
82         { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=ALOG},    0, 0, FLAGS, "ascale" },
83         { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=ALINEAR}, 0, 0, FLAGS, "ascale" },
84     { "acount", "how much frames to accumulate", OFFSET(count), AV_OPT_TYPE_INT, {.i64=1}, -1, 100, FLAGS },
85     { "rheight", "set histogram ratio of window height", OFFSET(phisto), AV_OPT_TYPE_FLOAT, {.dbl=0.10}, 0, 1, FLAGS },
86     { "slide", "set sonogram sliding", OFFSET(slide), AV_OPT_TYPE_INT, {.i64=REPLACE}, 0, NB_SLIDES-1, FLAGS, "slide" },
87         { "replace", "replace old rows with new", 0, AV_OPT_TYPE_CONST, {.i64=REPLACE},    0, 0, FLAGS, "slide" },
88         { "scroll",  "scroll from top to bottom", 0, AV_OPT_TYPE_CONST, {.i64=SCROLL}, 0, 0, FLAGS, "slide" },
89     { "hmode", "set histograms mode", OFFSET(hmode), AV_OPT_TYPE_INT, {.i64=ABS}, 0, NB_HMODES-1, FLAGS, "hmode" },
90         { "abs",  "use absolute samples",  0, AV_OPT_TYPE_CONST, {.i64=ABS}, 0, 0, FLAGS, "hmode" },
91         { "sign", "use unchanged samples", 0, AV_OPT_TYPE_CONST, {.i64=SIGN},0, 0, FLAGS, "hmode" },
92     { NULL }
93 };
94 
95 AVFILTER_DEFINE_CLASS(ahistogram);
96 
query_formats(AVFilterContext * ctx)97 static int query_formats(AVFilterContext *ctx)
98 {
99     AVFilterFormats *formats = NULL;
100     AVFilterChannelLayouts *layouts = NULL;
101     AVFilterLink *inlink = ctx->inputs[0];
102     AVFilterLink *outlink = ctx->outputs[0];
103     static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };
104     static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE };
105     int ret = AVERROR(EINVAL);
106 
107     formats = ff_make_format_list(sample_fmts);
108     if ((ret = ff_formats_ref         (formats, &inlink->outcfg.formats        )) < 0 ||
109         (layouts = ff_all_channel_counts()) == NULL ||
110         (ret = ff_channel_layouts_ref (layouts, &inlink->outcfg.channel_layouts)) < 0)
111         return ret;
112 
113     formats = ff_all_samplerates();
114     if ((ret = ff_formats_ref(formats, &inlink->outcfg.samplerates)) < 0)
115         return ret;
116 
117     formats = ff_make_format_list(pix_fmts);
118     if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
119         return ret;
120 
121     return 0;
122 }
123 
config_input(AVFilterLink * inlink)124 static int config_input(AVFilterLink *inlink)
125 {
126     AVFilterContext *ctx = inlink->dst;
127     AudioHistogramContext *s = ctx->priv;
128 
129     s->nb_samples = FFMAX(1, av_rescale(inlink->sample_rate, s->frame_rate.den, s->frame_rate.num));
130     s->dchannels = s->dmode == SINGLE ? 1 : inlink->ch_layout.nb_channels;
131     s->shistogram = av_calloc(s->w, s->dchannels * sizeof(*s->shistogram));
132     if (!s->shistogram)
133         return AVERROR(ENOMEM);
134 
135     s->achistogram = av_calloc(s->w, s->dchannels * sizeof(*s->achistogram));
136     if (!s->achistogram)
137         return AVERROR(ENOMEM);
138 
139     return 0;
140 }
141 
get_lin_bin_abs(float in,int w)142 static int get_lin_bin_abs(float in, int w)
143 {
144     return lrintf(av_clipf(fabsf(in), 0.f, 1.f) * (w - 1));
145 }
146 
get_lin_bin_sign(float in,int w)147 static int get_lin_bin_sign(float in, int w)
148 {
149     return lrintf((1.f + av_clipf(in, -1.f, 1.f)) * 0.5f * (w - 1));
150 }
151 
get_log_bin_abs(float in,int w)152 static int get_log_bin_abs(float in, int w)
153 {
154     return lrintf(av_clipf(1.f + log10f(fabsf(in)) / 6.f, 0.f, 1.f) * (w - 1));
155 }
156 
get_log_bin_sign(float in,int w)157 static int get_log_bin_sign(float in, int w)
158 {
159     return (w / 2) + FFSIGN(in) * lrintf(av_clipf(1.f + log10f(fabsf(in)) / 6.f, 0.f, 1.f) * (w / 2));
160 }
161 
config_output(AVFilterLink * outlink)162 static int config_output(AVFilterLink *outlink)
163 {
164     AudioHistogramContext *s = outlink->src->priv;
165 
166     outlink->w = s->w;
167     outlink->h = s->h;
168     outlink->sample_aspect_ratio = (AVRational){1,1};
169     outlink->frame_rate = s->frame_rate;
170     outlink->time_base = av_inv_q(outlink->frame_rate);
171 
172     s->histogram_h = s->h * s->phisto;
173     s->ypos = s->h * s->phisto;
174 
175     switch (s->ascale) {
176     case ALINEAR:
177         switch (s->hmode) {
178         case ABS:  s->get_bin = get_lin_bin_abs;  break;
179         case SIGN: s->get_bin = get_lin_bin_sign; break;
180         default:
181             return AVERROR_BUG;
182         }
183         break;
184     case ALOG:
185         switch (s->hmode) {
186         case ABS:  s->get_bin = get_log_bin_abs;  break;
187         case SIGN: s->get_bin = get_log_bin_sign; break;
188         default:
189             return AVERROR_BUG;
190         }
191         break;
192     default:
193         return AVERROR_BUG;
194     }
195 
196     if (s->dmode == SEPARATE) {
197         s->combine_buffer = av_malloc_array(outlink->w * 3, sizeof(*s->combine_buffer));
198         if (!s->combine_buffer)
199             return AVERROR(ENOMEM);
200     }
201 
202     return 0;
203 }
204 
filter_frame(AVFilterLink * inlink,AVFrame * in)205 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
206 {
207     AVFilterContext *ctx = inlink->dst;
208     AVFilterLink *outlink = ctx->outputs[0];
209     AudioHistogramContext *s = ctx->priv;
210     const int H = s->histogram_h;
211     const int w = s->w;
212     int c, y, n, p, bin;
213     uint64_t acmax = 1;
214     AVFrame *clone;
215 
216     if (!s->out || s->out->width  != outlink->w ||
217                    s->out->height != outlink->h) {
218         av_frame_free(&s->out);
219         s->out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
220         if (!s->out) {
221             av_frame_free(&in);
222             return AVERROR(ENOMEM);
223         }
224         for (n = H; n < s->h; n++) {
225             memset(s->out->data[0] + n * s->out->linesize[0], 0, w);
226             memset(s->out->data[1] + n * s->out->linesize[0], 127, w);
227             memset(s->out->data[2] + n * s->out->linesize[0], 127, w);
228             memset(s->out->data[3] + n * s->out->linesize[0], 0, w);
229         }
230     }
231 
232     av_frame_make_writable(s->out);
233     if (s->dmode == SEPARATE) {
234         for (y = 0; y < w; y++) {
235             s->combine_buffer[3 * y    ] = 0;
236             s->combine_buffer[3 * y + 1] = 127.5;
237             s->combine_buffer[3 * y + 2] = 127.5;
238         }
239     }
240 
241     for (n = 0; n < H; n++) {
242         memset(s->out->data[0] + n * s->out->linesize[0], 0, w);
243         memset(s->out->data[1] + n * s->out->linesize[0], 127, w);
244         memset(s->out->data[2] + n * s->out->linesize[0], 127, w);
245         memset(s->out->data[3] + n * s->out->linesize[0], 0, w);
246     }
247     s->out->pts = av_rescale_q(in->pts, inlink->time_base, outlink->time_base);
248 
249     s->first = s->frame_count;
250 
251     switch (s->ascale) {
252     case ALINEAR:
253         for (c = 0; c < inlink->ch_layout.nb_channels; c++) {
254             const float *src = (const float *)in->extended_data[c];
255             uint64_t *achistogram = &s->achistogram[(s->dmode == SINGLE ? 0: c) * w];
256 
257             for (n = 0; n < in->nb_samples; n++) {
258                 bin = s->get_bin(src[n], w);
259 
260                 achistogram[bin]++;
261             }
262 
263             if (s->in[s->first] && s->count >= 0) {
264                 uint64_t *shistogram = &s->shistogram[(s->dmode == SINGLE ? 0: c) * w];
265                 const float *src2 = (const float *)s->in[s->first]->extended_data[c];
266 
267                 for (n = 0; n < in->nb_samples; n++) {
268                     bin = s->get_bin(src2[n], w);
269 
270                     shistogram[bin]++;
271                 }
272             }
273         }
274         break;
275     case ALOG:
276         for (c = 0; c < inlink->ch_layout.nb_channels; c++) {
277             const float *src = (const float *)in->extended_data[c];
278             uint64_t *achistogram = &s->achistogram[(s->dmode == SINGLE ? 0: c) * w];
279 
280             for (n = 0; n < in->nb_samples; n++) {
281                 bin = s->get_bin(src[n], w);
282 
283                 achistogram[bin]++;
284             }
285 
286             if (s->in[s->first] && s->count >= 0) {
287                 uint64_t *shistogram = &s->shistogram[(s->dmode == SINGLE ? 0: c) * w];
288                 const float *src2 = (const float *)s->in[s->first]->extended_data[c];
289 
290                 for (n = 0; n < in->nb_samples; n++) {
291                     bin = s->get_bin(src2[n], w);
292 
293                     shistogram[bin]++;
294                 }
295             }
296         }
297         break;
298     }
299 
300     av_frame_free(&s->in[s->frame_count]);
301     s->in[s->frame_count] = in;
302     s->frame_count++;
303     if (s->frame_count > s->count)
304         s->frame_count = 0;
305 
306     for (n = 0; n < w * s->dchannels; n++) {
307         acmax = FFMAX(s->achistogram[n] - s->shistogram[n], acmax);
308     }
309 
310     for (c = 0; c < s->dchannels; c++) {
311         uint64_t *shistogram  = &s->shistogram[c * w];
312         uint64_t *achistogram = &s->achistogram[c * w];
313         float yf, uf, vf;
314 
315         if (s->dmode == SEPARATE) {
316             yf = 255.0f / s->dchannels;
317             uf = yf * M_PI;
318             vf = yf * M_PI;
319             uf *= 0.5 * sin((2 * M_PI * c) / s->dchannels);
320             vf *= 0.5 * cos((2 * M_PI * c) / s->dchannels);
321         }
322 
323         for (n = 0; n < w; n++) {
324             double a, aa;
325             int h;
326 
327             a = achistogram[n] - shistogram[n];
328 
329             switch (s->scale) {
330             case LINEAR:
331                 aa = a / (double)acmax;
332                 break;
333             case SQRT:
334                 aa = sqrt(a) / sqrt(acmax);
335                 break;
336             case CBRT:
337                 aa = cbrt(a) / cbrt(acmax);
338                 break;
339             case LOG:
340                 aa = log2(a + 1) / log2(acmax + 1);
341                 break;
342             case RLOG:
343                 aa = 1. - log2(a + 1) / log2(acmax + 1);
344                 if (aa == 1.)
345                     aa = 0;
346                 break;
347             default:
348                 av_assert0(0);
349             }
350 
351             h = aa * (H - 1);
352 
353             if (s->dmode == SINGLE) {
354 
355                 for (y = H - h; y < H; y++) {
356                     s->out->data[0][y * s->out->linesize[0] + n] = 255;
357                     s->out->data[3][y * s->out->linesize[0] + n] = 255;
358                 }
359 
360                 if (s->h - H > 0) {
361                     h = aa * 255;
362 
363                     s->out->data[0][s->ypos * s->out->linesize[0] + n] = av_clip_uint8(h);
364                     s->out->data[1][s->ypos * s->out->linesize[1] + n] = 127;
365                     s->out->data[2][s->ypos * s->out->linesize[2] + n] = 127;
366                     s->out->data[3][s->ypos * s->out->linesize[3] + n] = 255;
367                 }
368             } else if (s->dmode == SEPARATE) {
369                 float *out = &s->combine_buffer[3 * n];
370                 int old;
371 
372                 old = s->out->data[0][(H - h) * s->out->linesize[0] + n];
373                 for (y = H - h; y < H; y++) {
374                     if (s->out->data[0][y * s->out->linesize[0] + n] != old)
375                         break;
376                     old = s->out->data[0][y * s->out->linesize[0] + n];
377                     s->out->data[0][y * s->out->linesize[0] + n] = av_clip_uint8(yf);
378                     s->out->data[1][y * s->out->linesize[1] + n] = av_clip_uint8(128.f+uf);
379                     s->out->data[2][y * s->out->linesize[2] + n] = av_clip_uint8(128.f+vf);
380                     s->out->data[3][y * s->out->linesize[3] + n] = 255;
381                 }
382 
383                 out[0] += aa * yf;
384                 out[1] += aa * uf;
385                 out[2] += aa * vf;
386             }
387         }
388     }
389 
390     if (s->h - H > 0) {
391         if (s->dmode == SEPARATE) {
392             for (n = 0; n < w; n++) {
393                 float *cb = &s->combine_buffer[3 * n];
394 
395                 s->out->data[0][s->ypos * s->out->linesize[0] + n] = cb[0];
396                 s->out->data[1][s->ypos * s->out->linesize[1] + n] = cb[1];
397                 s->out->data[2][s->ypos * s->out->linesize[2] + n] = cb[2];
398                 s->out->data[3][s->ypos * s->out->linesize[3] + n] = 255;
399             }
400         }
401 
402         if (s->slide == SCROLL) {
403             for (p = 0; p < 4; p++) {
404                 for (y = s->h - 1; y >= H + 1; y--) {
405                     memmove(s->out->data[p] + (y  ) * s->out->linesize[p],
406                             s->out->data[p] + (y-1) * s->out->linesize[p], w);
407                 }
408             }
409         }
410 
411         s->ypos++;
412         if (s->slide == SCROLL || s->ypos >= s->h)
413             s->ypos = H;
414     }
415 
416     clone = av_frame_clone(s->out);
417     if (!clone)
418         return AVERROR(ENOMEM);
419 
420     return ff_filter_frame(outlink, clone);
421 }
422 
activate(AVFilterContext * ctx)423 static int activate(AVFilterContext *ctx)
424 {
425     AVFilterLink *inlink = ctx->inputs[0];
426     AVFilterLink *outlink = ctx->outputs[0];
427     AudioHistogramContext *s = ctx->priv;
428     AVFrame *in;
429     int ret;
430 
431     FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
432 
433     ret = ff_inlink_consume_samples(inlink, s->nb_samples, s->nb_samples, &in);
434     if (ret < 0)
435         return ret;
436     if (ret > 0)
437         return filter_frame(inlink, in);
438 
439     if (ff_inlink_queued_samples(inlink) >= s->nb_samples) {
440         ff_filter_set_ready(ctx, 10);
441         return 0;
442     }
443 
444     FF_FILTER_FORWARD_STATUS(inlink, outlink);
445     FF_FILTER_FORWARD_WANTED(outlink, inlink);
446 
447     return FFERROR_NOT_READY;
448 }
449 
uninit(AVFilterContext * ctx)450 static av_cold void uninit(AVFilterContext *ctx)
451 {
452     AudioHistogramContext *s = ctx->priv;
453     int i;
454 
455     av_frame_free(&s->out);
456     av_freep(&s->shistogram);
457     av_freep(&s->achistogram);
458     av_freep(&s->combine_buffer);
459     for (i = 0; i < 101; i++)
460         av_frame_free(&s->in[i]);
461 }
462 
463 static const AVFilterPad ahistogram_inputs[] = {
464     {
465         .name         = "default",
466         .type         = AVMEDIA_TYPE_AUDIO,
467         .config_props = config_input,
468     },
469 };
470 
471 static const AVFilterPad ahistogram_outputs[] = {
472     {
473         .name         = "default",
474         .type         = AVMEDIA_TYPE_VIDEO,
475         .config_props = config_output,
476     },
477 };
478 
479 const AVFilter ff_avf_ahistogram = {
480     .name          = "ahistogram",
481     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to histogram video output."),
482     .uninit        = uninit,
483     .priv_size     = sizeof(AudioHistogramContext),
484     .activate      = activate,
485     FILTER_INPUTS(ahistogram_inputs),
486     FILTER_OUTPUTS(ahistogram_outputs),
487     FILTER_QUERY_FUNC(query_formats),
488     .priv_class    = &ahistogram_class,
489 };
490