libavfilter/avf_showwaves.c

   1 /*
   2  * Copyright (c) 2012 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  * audio to video multimedia filter
  24  */
  25
  26 #include "config_components.h"
  27
  28 #include "libavutil/avassert.h"
  29 #include "libavutil/avstring.h"
  30 #include "libavutil/channel_layout.h"
  31 #include "libavutil/intreadwrite.h"
  32 #include "libavutil/mem.h"
  33 #include "libavutil/opt.h"
  34 #include "libavutil/parseutils.h"
  35 #include "avfilter.h"
  36 #include "filters.h"
  37 #include "formats.h"
  38 #include "audio.h"
  39 #include "video.h"
  40
  41 enum ShowWavesMode {
  42     MODE_POINT,
  43     MODE_LINE,
  44     MODE_P2P,
  45     MODE_CENTERED_LINE,
  46     MODE_NB,
  47 };
  48
  49 enum ShowWavesScale {
  50     SCALE_LIN,
  51     SCALE_LOG,
  52     SCALE_SQRT,
  53     SCALE_CBRT,
  54     SCALE_NB,
  55 };
  56
  57 enum ShowWavesDrawMode {
  58     DRAW_SCALE,
  59     DRAW_FULL,
  60     DRAW_NB,
  61 };
  62
  63 enum ShowWavesFilterMode {
  64     FILTER_AVERAGE,
  65     FILTER_PEAK,
  66     FILTER_NB,
  67 };
  68
  69 struct frame_node {
  70     AVFrame *frame;
  71     struct frame_node *next;
  72 };
  73
  74 typedef struct ShowWavesContext {
  75     const AVClass *class;
  76     int w, h;
  77     AVRational rate;
  78     char *colors;
  79     int buf_idx;
  80     int16_t *buf_idy;    /* y coordinate of previous sample for each channel */
  81     int16_t *history;
  82     int history_nb_samples;
  83     int history_index;
  84     AVFrame *outpicref;
  85     AVRational n, q, c;
  86     int pixstep;
  87     int mode;                   ///< ShowWavesMode
  88     int scale;                  ///< ShowWavesScale
  89     int draw_mode;              ///< ShowWavesDrawMode
  90     int split_channels;
  91     int filter_mode;
  92     uint8_t *fg;
  93
  94     int (*get_h)(int16_t sample, int height);
  95     void (*draw_sample)(uint8_t *buf, int height, int linesize,
  96                         int16_t *prev_y, const uint8_t color[4], int h);
  97
  98     /* single picture */
  99     int single_pic;
 100     struct frame_node *audio_frames;
 101     struct frame_node *last_frame;
 102     int64_t total_samples;
 103     int64_t *sum; /* abs sum of the samples per channel */
 104 } ShowWavesContext;
 105
 106 #define OFFSET(x) offsetof(ShowWavesContext, x)
 107 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
 108
 109 static const AVOption showwaves_options[] = {
 110     { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
 111     { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
 112     { "mode", "select display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_POINT}, 0, MODE_NB-1,        .flags=FLAGS, .unit="mode"},
 113         { "point", "draw a point for each sample",         0, AV_OPT_TYPE_CONST, {.i64=MODE_POINT},         .flags=FLAGS, .unit="mode"},
 114         { "line",  "draw a line for each sample",          0, AV_OPT_TYPE_CONST, {.i64=MODE_LINE},          .flags=FLAGS, .unit="mode"},
 115         { "p2p",   "draw a line between samples",          0, AV_OPT_TYPE_CONST, {.i64=MODE_P2P},           .flags=FLAGS, .unit="mode"},
 116         { "cline", "draw a centered line for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_CENTERED_LINE}, .flags=FLAGS, .unit="mode"},
 117     { "n",    "set how many samples to show in the same point", OFFSET(n), AV_OPT_TYPE_RATIONAL, {.i64 = 0}, 0, INT_MAX, FLAGS },
 118     { "rate", "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
 119     { "r",    "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
 120     { "split_channels", "draw channels separately", OFFSET(split_channels), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
 121     { "colors", "set channels colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, FLAGS },
 122     { "scale", "set amplitude scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, SCALE_NB-1, FLAGS, .unit="scale" },
 123         { "lin", "linear",         0, AV_OPT_TYPE_CONST, {.i64=SCALE_LIN}, .flags=FLAGS, .unit="scale"},
 124         { "log", "logarithmic",    0, AV_OPT_TYPE_CONST, {.i64=SCALE_LOG}, .flags=FLAGS, .unit="scale"},
 125         { "sqrt", "square root",   0, AV_OPT_TYPE_CONST, {.i64=SCALE_SQRT}, .flags=FLAGS, .unit="scale"},
 126         { "cbrt", "cubic root",    0, AV_OPT_TYPE_CONST, {.i64=SCALE_CBRT}, .flags=FLAGS, .unit="scale"},
 127     { "draw", "set draw mode", OFFSET(draw_mode), AV_OPT_TYPE_INT, {.i64 = DRAW_SCALE}, 0, DRAW_NB-1, FLAGS, .unit="draw" },
 128         { "scale", "scale pixel values for each drawn sample", 0, AV_OPT_TYPE_CONST, {.i64=DRAW_SCALE}, .flags=FLAGS, .unit="draw"},
 129         { "full",  "draw every pixel for sample directly",     0, AV_OPT_TYPE_CONST, {.i64=DRAW_FULL},  .flags=FLAGS, .unit="draw"},
 130     { NULL }
 131 };
 132
 133 AVFILTER_DEFINE_CLASS(showwaves);
 134
 135 static av_cold void uninit(AVFilterContext *ctx)
 136 {
 137     ShowWavesContext *showwaves = ctx->priv;
 138
 139     av_frame_free(&showwaves->outpicref);
 140     av_freep(&showwaves->buf_idy);
 141     av_freep(&showwaves->history);
 142     av_freep(&showwaves->fg);
 143
 144     if (showwaves->single_pic) {
 145         struct frame_node *node = showwaves->audio_frames;
 146         while (node) {
 147             struct frame_node *tmp = node;
 148
 149             node = node->next;
 150             av_frame_free(&tmp->frame);
 151             av_freep(&tmp);
 152         }
 153         av_freep(&showwaves->sum);
 154         showwaves->last_frame = NULL;
 155     }
 156 }
 157
 158 static int query_formats(const AVFilterContext *ctx,
 159                          AVFilterFormatsConfig **cfg_in,
 160                          AVFilterFormatsConfig **cfg_out)
 161 {
 162     AVFilterFormats *formats = NULL;
 163     static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE };
 164     static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
 165     int ret;
 166
 167     /* set input audio formats */
 168     formats = ff_make_format_list(sample_fmts);
 169     if ((ret = ff_formats_ref(formats, &cfg_in[0]->formats)) < 0)
 170         return ret;
 171
 172     /* set output video format */
 173     formats = ff_make_format_list(pix_fmts);
 174     if ((ret = ff_formats_ref(formats, &cfg_out[0]->formats)) < 0)
 175         return ret;
 176
 177     return 0;
 178 }
 179
 180 static int get_lin_h(int16_t sample, int height)
 181 {
 182     return height/2 - av_rescale(sample, height/2, INT16_MAX);
 183 }
 184
 185 static int get_lin_h2(int16_t sample, int height)
 186 {
 187     return av_rescale(FFABS(sample), height, INT16_MAX);
 188 }
 189
 190 static int get_log_h(int16_t sample, int height)
 191 {
 192     return height/2 - FFSIGN(sample) * (log10(1 + FFABS(sample)) * (height/2) / log10(1 + INT16_MAX));
 193 }
 194
 195 static int get_log_h2(int16_t sample, int height)
 196 {
 197     return log10(1 + FFABS(sample)) * height / log10(1 + INT16_MAX);
 198 }
 199
 200 static int get_sqrt_h(int16_t sample, int height)
 201 {
 202     return height/2 - FFSIGN(sample) * (sqrt(FFABS(sample)) * (height/2) / sqrt(INT16_MAX));
 203 }
 204
 205 static int get_sqrt_h2(int16_t sample, int height)
 206 {
 207     return sqrt(FFABS(sample)) * height / sqrt(INT16_MAX);
 208 }
 209
 210 static int get_cbrt_h(int16_t sample, int height)
 211 {
 212     return height/2 - FFSIGN(sample) * (cbrt(FFABS(sample)) * (height/2) / cbrt(INT16_MAX));
 213 }
 214
 215 static int get_cbrt_h2(int16_t sample, int height)
 216 {
 217     return cbrt(FFABS(sample)) * height / cbrt(INT16_MAX);
 218 }
 219
 220 static void draw_sample_point_rgba_scale(uint8_t *buf, int height, int linesize,
 221                                          int16_t *prev_y,
 222                                          const uint8_t color[4], int h)
 223 {
 224     if (h >= 0 && h < height) {
 225         buf[h * linesize + 0] += color[0];
 226         buf[h * linesize + 1] += color[1];
 227         buf[h * linesize + 2] += color[2];
 228         buf[h * linesize + 3] += color[3];
 229     }
 230 }
 231
 232 static void draw_sample_point_rgba_full(uint8_t *buf, int height, int linesize,
 233                                    int16_t *prev_y,
 234                                    const uint8_t color[4], int h)
 235 {
 236     uint32_t clr = AV_RN32(color);
 237     if (h >= 0 && h < height)
 238         AV_WN32(buf + h * linesize, clr);
 239 }
 240
 241 static void draw_sample_line_rgba_scale(uint8_t *buf, int height, int linesize,
 242                                         int16_t *prev_y,
 243                                         const uint8_t color[4], int h)
 244 {
 245     int start   = height/2;
 246     int end     = av_clip(h, 0, height-1);
 247     uint8_t *bufk;
 248     if (start > end)
 249         FFSWAP(int16_t, start, end);
 250     bufk = buf + start * linesize;
 251     for (int k = start; k < end; k++, bufk += linesize) {
 252         bufk[0] += color[0];
 253         bufk[1] += color[1];
 254         bufk[2] += color[2];
 255         bufk[3] += color[3];
 256     }
 257 }
 258
 259 static void draw_sample_line_rgba_full(uint8_t *buf, int height, int linesize,
 260                                        int16_t *prev_y,
 261                                        const uint8_t color[4], int h)
 262 {
 263     int start   = height/2;
 264     int end     = av_clip(h, 0, height-1);
 265     uint32_t clr = AV_RN32(color);
 266     uint8_t *bufk;
 267     if (start > end)
 268         FFSWAP(int16_t, start, end);
 269     bufk = buf + start * linesize;
 270     for (int k = start; k < end; k++, bufk += linesize)
 271         AV_WN32(bufk, clr);
 272 }
 273
 274 static void draw_sample_p2p_rgba_scale(uint8_t *buf, int height, int linesize,
 275                                        int16_t *prev_y,
 276                                        const uint8_t color[4], int h)
 277 {
 278     if (h >= 0 && h < height) {
 279         buf[h * linesize + 0] += color[0];
 280         buf[h * linesize + 1] += color[1];
 281         buf[h * linesize + 2] += color[2];
 282         buf[h * linesize + 3] += color[3];
 283         if (*prev_y && h != *prev_y) {
 284             int start = *prev_y;
 285             uint8_t *bufk;
 286             int end = av_clip(h, 0, height-1);
 287             if (start > end)
 288                 FFSWAP(int16_t, start, end);
 289             bufk = buf + (start + 1) * linesize;
 290             for (int k = start + 1; k < end; k++, bufk += linesize) {
 291                 bufk[0] += color[0];
 292                 bufk[1] += color[1];
 293                 bufk[2] += color[2];
 294                 bufk[3] += color[3];
 295             }
 296         }
 297     }
 298     *prev_y = h;
 299 }
 300
 301 static void draw_sample_p2p_rgba_full(uint8_t *buf, int height, int linesize,
 302                                       int16_t *prev_y,
 303                                       const uint8_t color[4], int h)
 304 {
 305     uint32_t clr = AV_RN32(color);
 306     if (h >= 0 && h < height) {
 307         AV_WN32(buf + h * linesize, clr);
 308         if (*prev_y && h != *prev_y) {
 309             int start = *prev_y;
 310             uint8_t *bufk;
 311             int end = av_clip(h, 0, height-1);
 312             if (start > end)
 313                 FFSWAP(int16_t, start, end);
 314             bufk = buf + (start + 1) * linesize;
 315             for (int k = start + 1; k < end; k++, bufk += linesize)
 316                 AV_WN32(bufk, clr);
 317         }
 318     }
 319     *prev_y = h;
 320 }
 321
 322 static void draw_sample_cline_rgba_scale(uint8_t *buf, int height, int linesize,
 323                                          int16_t *prev_y,
 324                                          const uint8_t color[4], int h)
 325 {
 326     const int start = (height - h) / 2;
 327     const int end   = start + h;
 328     uint8_t *bufk = buf + start * linesize;
 329     for (int k = start; k < end; k++, bufk += linesize) {
 330         bufk[0] += color[0];
 331         bufk[1] += color[1];
 332         bufk[2] += color[2];
 333         bufk[3] += color[3];
 334     }
 335 }
 336
 337 static void draw_sample_cline_rgba_full(uint8_t *buf, int height, int linesize,
 338                                          int16_t *prev_y,
 339                                          const uint8_t color[4], int h)
 340 {
 341     uint32_t clr = AV_RN32(color);
 342     const int start = (height - h) / 2;
 343     const int end   = start + h;
 344     uint8_t *bufk = buf + start * linesize;
 345     for (int k = start; k < end; k++, bufk += linesize)
 346         AV_WN32(bufk, clr);
 347 }
 348
 349 static void draw_sample_point_gray(uint8_t *buf, int height, int linesize,
 350                                    int16_t *prev_y,
 351                                    const uint8_t color[4], int h)
 352 {
 353     if (h >= 0 && h < height)
 354         buf[h * linesize] += color[0];
 355 }
 356
 357 static void draw_sample_line_gray(uint8_t *buf, int height, int linesize,
 358                                   int16_t *prev_y,
 359                                   const uint8_t color[4], int h)
 360 {
 361     int k;
 362     int start   = height/2;
 363     int end     = av_clip(h, 0, height-1);
 364     if (start > end)
 365         FFSWAP(int16_t, start, end);
 366     for (k = start; k < end; k++)
 367         buf[k * linesize] += color[0];
 368 }
 369
 370 static void draw_sample_p2p_gray(uint8_t *buf, int height, int linesize,
 371                                  int16_t *prev_y,
 372                                  const uint8_t color[4], int h)
 373 {
 374     int k;
 375     if (h >= 0 && h < height) {
 376         buf[h * linesize] += color[0];
 377         if (*prev_y && h != *prev_y) {
 378             int start = *prev_y;
 379             int end = av_clip(h, 0, height-1);
 380             if (start > end)
 381                 FFSWAP(int16_t, start, end);
 382             for (k = start + 1; k < end; k++)
 383                 buf[k * linesize] += color[0];
 384         }
 385     }
 386     *prev_y = h;
 387 }
 388
 389 static void draw_sample_cline_gray(uint8_t *buf, int height, int linesize,
 390                                    int16_t *prev_y,
 391                                    const uint8_t color[4], int h)
 392 {
 393     int k;
 394     const int start = (height - h) / 2;
 395     const int end   = start + h;
 396     for (k = start; k < end; k++)
 397         buf[k * linesize] += color[0];
 398 }
 399
 400 static int config_output(AVFilterLink *outlink)
 401 {
 402     FilterLink *l = ff_filter_link(outlink);
 403     AVFilterContext *ctx = outlink->src;
 404     AVFilterLink *inlink = ctx->inputs[0];
 405     ShowWavesContext *showwaves = ctx->priv;
 406     int nb_channels = inlink->ch_layout.nb_channels;
 407     char *colors, *saveptr = NULL;
 408     uint8_t x;
 409     int ch;
 410
 411     showwaves->q = av_make_q(0, 1);
 412     showwaves->c = av_make_q(0, 1);
 413
 414     if (showwaves->single_pic) {
 415         showwaves->n = av_make_q(1, 1);
 416         l->frame_rate = av_make_q(1, 1);
 417     } else {
 418         if (!showwaves->n.num || !showwaves->n.den) {
 419             showwaves->n = av_mul_q(av_make_q(inlink->sample_rate,
 420                                               showwaves->w), av_inv_q(showwaves->rate));
 421             l->frame_rate = showwaves->rate;
 422         } else {
 423             l->frame_rate = av_div_q(av_make_q(inlink->sample_rate, showwaves->w), showwaves->n);
 424         }
 425     }
 426
 427     showwaves->buf_idx = 0;
 428     if (!FF_ALLOCZ_TYPED_ARRAY(showwaves->buf_idy, nb_channels)) {
 429         av_log(ctx, AV_LOG_ERROR, "Could not allocate showwaves buffer\n");
 430         return AVERROR(ENOMEM);
 431     }
 432
 433     showwaves->history_nb_samples = av_rescale(showwaves->w * nb_channels * 2,
 434                                                showwaves->n.num, showwaves->n.den);
 435     if (showwaves->history_nb_samples <= 0)
 436         return AVERROR(EINVAL);
 437     showwaves->history = av_calloc(showwaves->history_nb_samples,
 438                                    sizeof(*showwaves->history));
 439     if (!showwaves->history)
 440         return AVERROR(ENOMEM);
 441
 442     outlink->time_base = av_inv_q(l->frame_rate);
 443     outlink->w = showwaves->w;
 444     outlink->h = showwaves->h;
 445     outlink->sample_aspect_ratio = (AVRational){1,1};
 446
 447     av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d r:%f n:%f\n",
 448            showwaves->w, showwaves->h, av_q2d(l->frame_rate), av_q2d(showwaves->n));
 449
 450     switch (outlink->format) {
 451     case AV_PIX_FMT_GRAY8:
 452         switch (showwaves->mode) {
 453         case MODE_POINT:         showwaves->draw_sample = draw_sample_point_gray; break;
 454         case MODE_LINE:          showwaves->draw_sample = draw_sample_line_gray;  break;
 455         case MODE_P2P:           showwaves->draw_sample = draw_sample_p2p_gray;   break;
 456         case MODE_CENTERED_LINE: showwaves->draw_sample = draw_sample_cline_gray; break;
 457         default:
 458             return AVERROR_BUG;
 459         }
 460         showwaves->pixstep = 1;
 461         break;
 462     case AV_PIX_FMT_RGBA:
 463         switch (showwaves->mode) {
 464         case MODE_POINT:         showwaves->draw_sample = showwaves->draw_mode == DRAW_SCALE ? draw_sample_point_rgba_scale : draw_sample_point_rgba_full; break;
 465         case MODE_LINE:          showwaves->draw_sample = showwaves->draw_mode == DRAW_SCALE ? draw_sample_line_rgba_scale  : draw_sample_line_rgba_full;  break;
 466         case MODE_P2P:           showwaves->draw_sample = showwaves->draw_mode == DRAW_SCALE ? draw_sample_p2p_rgba_scale   : draw_sample_p2p_rgba_full;   break;
 467         case MODE_CENTERED_LINE: showwaves->draw_sample = showwaves->draw_mode == DRAW_SCALE ? draw_sample_cline_rgba_scale : draw_sample_cline_rgba_full; break;
 468         default:
 469             return AVERROR_BUG;
 470         }
 471         showwaves->pixstep = 4;
 472         break;
 473     }
 474
 475     switch (showwaves->scale) {
 476     case SCALE_LIN:
 477         switch (showwaves->mode) {
 478         case MODE_POINT:
 479         case MODE_LINE:
 480         case MODE_P2P:           showwaves->get_h = get_lin_h;  break;
 481         case MODE_CENTERED_LINE: showwaves->get_h = get_lin_h2; break;
 482         default:
 483             return AVERROR_BUG;
 484         }
 485         break;
 486     case SCALE_LOG:
 487         switch (showwaves->mode) {
 488         case MODE_POINT:
 489         case MODE_LINE:
 490         case MODE_P2P:           showwaves->get_h = get_log_h;  break;
 491         case MODE_CENTERED_LINE: showwaves->get_h = get_log_h2; break;
 492         default:
 493             return AVERROR_BUG;
 494         }
 495         break;
 496     case SCALE_SQRT:
 497         switch (showwaves->mode) {
 498         case MODE_POINT:
 499         case MODE_LINE:
 500         case MODE_P2P:           showwaves->get_h = get_sqrt_h;  break;
 501         case MODE_CENTERED_LINE: showwaves->get_h = get_sqrt_h2; break;
 502         default:
 503             return AVERROR_BUG;
 504         }
 505         break;
 506     case SCALE_CBRT:
 507         switch (showwaves->mode) {
 508         case MODE_POINT:
 509         case MODE_LINE:
 510         case MODE_P2P:           showwaves->get_h = get_cbrt_h;  break;
 511         case MODE_CENTERED_LINE: showwaves->get_h = get_cbrt_h2; break;
 512         default:
 513             return AVERROR_BUG;
 514         }
 515         break;
 516     }
 517
 518     showwaves->fg = av_malloc_array(nb_channels, 4 * sizeof(*showwaves->fg));
 519     if (!showwaves->fg)
 520         return AVERROR(ENOMEM);
 521
 522     colors = av_strdup(showwaves->colors);
 523     if (!colors)
 524         return AVERROR(ENOMEM);
 525
 526     if (showwaves->draw_mode == DRAW_SCALE) {
 527         /* multiplication factor, pre-computed to avoid in-loop divisions */
 528         x = (showwaves->n.den * 255) / ((showwaves->split_channels ? 1 : nb_channels) * showwaves->n.num);
 529     } else {
 530         x = 255;
 531     }
 532     if (outlink->format == AV_PIX_FMT_RGBA) {
 533         uint8_t fg[4] = { 0xff, 0xff, 0xff, 0xff };
 534
 535         for (ch = 0; ch < nb_channels; ch++) {
 536             char *color;
 537
 538             color = av_strtok(ch == 0 ? colors : NULL, " |", &saveptr);
 539             if (color)
 540                 av_parse_color(fg, color, -1, ctx);
 541             showwaves->fg[4*ch + 0] = fg[0] * x / 255.;
 542             showwaves->fg[4*ch + 1] = fg[1] * x / 255.;
 543             showwaves->fg[4*ch + 2] = fg[2] * x / 255.;
 544             showwaves->fg[4*ch + 3] = fg[3] * x / 255.;
 545         }
 546     } else {
 547         for (ch = 0; ch < nb_channels; ch++)
 548             showwaves->fg[4 * ch + 0] = x;
 549     }
 550     av_free(colors);
 551
 552     return 0;
 553 }
 554
 555 inline static int push_frame(AVFilterLink *outlink, int i, int64_t pts)
 556 {
 557     AVFilterContext *ctx = outlink->src;
 558     AVFilterLink *inlink = ctx->inputs[0];
 559     ShowWavesContext *showwaves = outlink->src->priv;
 560     int nb_channels = inlink->ch_layout.nb_channels;
 561     int ret;
 562
 563     showwaves->outpicref->duration = 1;
 564     showwaves->outpicref->pts = av_rescale_q(pts + i,
 565                                              inlink->time_base,
 566                                              outlink->time_base);
 567
 568     ret = ff_filter_frame(outlink, showwaves->outpicref);
 569     showwaves->outpicref = NULL;
 570     showwaves->buf_idx = 0;
 571     for (int i = 0; i < nb_channels; i++)
 572         showwaves->buf_idy[i] = 0;
 573     return ret;
 574 }
 575
 576 static int push_single_pic(AVFilterLink *outlink)
 577 {
 578     AVFilterContext *ctx = outlink->src;
 579     AVFilterLink *inlink = ctx->inputs[0];
 580     ShowWavesContext *showwaves = ctx->priv;
 581     int64_t n = 0, column_max_samples = showwaves->total_samples / outlink->w;
 582     int64_t remaining_samples = showwaves->total_samples - (column_max_samples * outlink->w);
 583     int64_t last_column_samples = column_max_samples + remaining_samples;
 584     AVFrame *out = showwaves->outpicref;
 585     struct frame_node *node;
 586     const int nb_channels = inlink->ch_layout.nb_channels;
 587     const int ch_height = showwaves->split_channels ? outlink->h / nb_channels : outlink->h;
 588     const int linesize = out->linesize[0];
 589     const int pixstep = showwaves->pixstep;
 590     int col = 0;
 591     int64_t *sum = showwaves->sum;
 592
 593     if (column_max_samples == 0) {
 594         av_log(ctx, AV_LOG_ERROR, "Too few samples\n");
 595         return AVERROR(EINVAL);
 596     }
 597
 598     av_log(ctx, AV_LOG_DEBUG, "Create frame averaging %"PRId64" samples per column\n", column_max_samples);
 599
 600     memset(sum, 0, nb_channels * sizeof(*sum));
 601
 602     for (node = showwaves->audio_frames; node; node = node->next) {
 603         int i;
 604         const AVFrame *frame = node->frame;
 605         const int16_t *p = (const int16_t *)frame->data[0];
 606
 607         for (i = 0; i < frame->nb_samples; i++) {
 608             int64_t max_samples = col == outlink->w - 1 ? last_column_samples: column_max_samples;
 609             int ch;
 610
 611             switch (showwaves->filter_mode) {
 612             case FILTER_AVERAGE:
 613                 for (ch = 0; ch < nb_channels; ch++)
 614                     sum[ch] += abs(p[ch + i*nb_channels]);
 615                 break;
 616             case FILTER_PEAK:
 617                 for (ch = 0; ch < nb_channels; ch++)
 618                     sum[ch] = FFMAX(sum[ch], abs(p[ch + i*nb_channels]));
 619                 break;
 620             }
 621
 622             n++;
 623             if (n == max_samples) {
 624                 for (ch = 0; ch < nb_channels; ch++) {
 625                     int16_t sample = sum[ch] / (showwaves->filter_mode == FILTER_AVERAGE ? max_samples : 1);
 626                     uint8_t *buf = out->data[0] + col * pixstep;
 627                     int h;
 628
 629                     if (showwaves->split_channels)
 630                         buf += ch*ch_height*linesize;
 631                     av_assert0(col < outlink->w);
 632                     h = showwaves->get_h(sample, ch_height);
 633                     showwaves->draw_sample(buf, ch_height, linesize, &showwaves->buf_idy[ch], &showwaves->fg[ch * 4], h);
 634                     sum[ch] = 0;
 635                 }
 636                 col++;
 637                 n = 0;
 638             }
 639         }
 640     }
 641
 642     return push_frame(outlink, 0, 0);
 643 }
 644
 645
 646 static int request_frame(AVFilterLink *outlink)
 647 {
 648     ShowWavesContext *showwaves = outlink->src->priv;
 649     AVFilterLink *inlink = outlink->src->inputs[0];
 650     int ret;
 651
 652     ret = ff_request_frame(inlink);
 653     if (ret == AVERROR_EOF && showwaves->outpicref) {
 654         push_single_pic(outlink);
 655     }
 656
 657     return ret;
 658 }
 659
 660 static int alloc_out_frame(ShowWavesContext *showwaves,
 661                            AVFilterLink *outlink)
 662 {
 663     if (!showwaves->outpicref) {
 664         AVFrame *out = showwaves->outpicref =
 665             ff_get_video_buffer(outlink, outlink->w, outlink->h);
 666         if (!out)
 667             return AVERROR(ENOMEM);
 668         out->width  = outlink->w;
 669         out->height = outlink->h;
 670         for (int j = 0; j < outlink->h; j++)
 671             memset(out->data[0] + j*out->linesize[0], 0, outlink->w * showwaves->pixstep);
 672     }
 673     return 0;
 674 }
 675
 676 static av_cold int init(AVFilterContext *ctx)
 677 {
 678     ShowWavesContext *showwaves = ctx->priv;
 679
 680     if (!strcmp(ctx->filter->name, "showwavespic")) {
 681         showwaves->single_pic = 1;
 682         showwaves->mode = MODE_CENTERED_LINE;
 683     }
 684
 685     return 0;
 686 }
 687
 688 #if CONFIG_SHOWWAVES_FILTER
 689
 690 static int showwaves_filter_frame(AVFilterLink *inlink, AVFrame *insamples)
 691 {
 692     AVFilterContext *ctx = inlink->dst;
 693     AVFilterLink *outlink = ctx->outputs[0];
 694     ShowWavesContext *showwaves = ctx->priv;
 695     const int nb_samples = insamples->nb_samples;
 696     AVFrame *outpicref = showwaves->outpicref;
 697     const int16_t *p = (const int16_t *)insamples->data[0];
 698     int16_t *history = showwaves->history;
 699     const int nb_channels = inlink->ch_layout.nb_channels;
 700     int i, j, ret = 0, linesize;
 701     const int pixstep = showwaves->pixstep;
 702     const int ch_height = showwaves->split_channels ? outlink->h / nb_channels : outlink->h;
 703     const int history_nb_samples = showwaves->history_nb_samples;
 704     const int split_channels = showwaves->split_channels;
 705     const AVRational i_n = av_inv_q(showwaves->n);
 706     const AVRational u_q = av_make_q(1, 1);
 707     const AVRational z_q = av_make_q(0, 1);
 708     int16_t *buf_idy = showwaves->buf_idy;
 709     int idx = showwaves->history_index;
 710     int buf_idx = showwaves->buf_idx;
 711     const uint8_t *fg = showwaves->fg;
 712     const int w = showwaves->w;
 713     uint8_t *dst;
 714
 715     for (int n = 0; n < nb_samples * nb_channels; n++) {
 716         history[idx++] = p[n];
 717         if (idx >= history_nb_samples)
 718             idx = 0;
 719     }
 720     showwaves->history_index = idx;
 721
 722     ret = alloc_out_frame(showwaves, outlink);
 723     if (ret < 0)
 724         goto end;
 725     outpicref = showwaves->outpicref;
 726     linesize = outpicref->linesize[0];
 727
 728     /* draw data in the buffer */
 729     dst = outpicref->data[0];
 730     for (i = 0; i < history_nb_samples; i++) {
 731         for (j = 0; j < nb_channels; j++) {
 732             uint8_t *buf = dst + buf_idx * pixstep;
 733             int h;
 734
 735             if (split_channels)
 736                 buf += j*ch_height*linesize;
 737             h = showwaves->get_h(history[idx++], ch_height);
 738             if (idx >= history_nb_samples)
 739                 idx = 0;
 740             showwaves->draw_sample(buf, ch_height, linesize,
 741                                    &buf_idy[j], &fg[j * 4], h);
 742         }
 743
 744         showwaves->c = av_add_q(showwaves->c, i_n);
 745         if (av_cmp_q(showwaves->c, u_q) >= 0) {
 746             showwaves->c = z_q;
 747             buf_idx++;
 748         }
 749         if (buf_idx == w)
 750             break;
 751     }
 752
 753     showwaves->buf_idx = buf_idx;
 754
 755     if ((ret = push_frame(outlink, history_nb_samples - i - 1, insamples->pts)) < 0)
 756         goto end;
 757     outpicref = showwaves->outpicref;
 758 end:
 759     av_frame_free(&insamples);
 760     return ret;
 761 }
 762
 763 static int activate(AVFilterContext *ctx)
 764 {
 765     AVFilterLink *inlink = ctx->inputs[0];
 766     AVFilterLink *outlink = ctx->outputs[0];
 767     ShowWavesContext *showwaves = ctx->priv;
 768     AVRational q;
 769     AVFrame *in;
 770     int nb_samples;
 771     int ret;
 772
 773     FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
 774
 775     q = av_add_q(showwaves->q, av_mul_q(av_make_q(outlink->w, 1), showwaves->n));
 776     nb_samples = (q.num + (q.den / 2)) / q.den;
 777     ret = ff_inlink_consume_samples(inlink, nb_samples, nb_samples, &in);
 778     if (ret < 0)
 779         return ret;
 780     if (ret > 0) {
 781         showwaves->q = av_sub_q(q, av_make_q(nb_samples, 1));
 782         return showwaves_filter_frame(inlink, in);
 783     }
 784
 785     FF_FILTER_FORWARD_STATUS(inlink, outlink);
 786     FF_FILTER_FORWARD_WANTED(outlink, inlink);
 787
 788     return FFERROR_NOT_READY;
 789 }
 790
 791 static const AVFilterPad showwaves_outputs[] = {
 792     {
 793         .name          = "default",
 794         .type          = AVMEDIA_TYPE_VIDEO,
 795         .config_props  = config_output,
 796     },
 797 };
 798
 799 const FFFilter ff_avf_showwaves = {
 800     .p.name        = "showwaves",
 801     .p.description = NULL_IF_CONFIG_SMALL("Convert input audio to a video output."),
 802     .p.priv_class  = &showwaves_class,
 803     .init          = init,
 804     .uninit        = uninit,
 805     .priv_size     = sizeof(ShowWavesContext),
 806     FILTER_INPUTS(ff_audio_default_filterpad),
 807     .activate      = activate,
 808     FILTER_OUTPUTS(showwaves_outputs),
 809     FILTER_QUERY_FUNC2(query_formats),
 810 };
 811
 812 #endif // CONFIG_SHOWWAVES_FILTER
 813
 814 #if CONFIG_SHOWWAVESPIC_FILTER
 815
 816 #define OFFSET(x) offsetof(ShowWavesContext, x)
 817 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
 818
 819 static const AVOption showwavespic_options[] = {
 820     { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
 821     { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
 822     { "split_channels", "draw channels separately", OFFSET(split_channels), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
 823     { "colors", "set channels colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, FLAGS },
 824     { "scale", "set amplitude scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, SCALE_NB-1, FLAGS, .unit="scale" },
 825         { "lin", "linear",         0, AV_OPT_TYPE_CONST, {.i64=SCALE_LIN}, .flags=FLAGS, .unit="scale"},
 826         { "log", "logarithmic",    0, AV_OPT_TYPE_CONST, {.i64=SCALE_LOG}, .flags=FLAGS, .unit="scale"},
 827         { "sqrt", "square root",   0, AV_OPT_TYPE_CONST, {.i64=SCALE_SQRT}, .flags=FLAGS, .unit="scale"},
 828         { "cbrt", "cubic root",    0, AV_OPT_TYPE_CONST, {.i64=SCALE_CBRT}, .flags=FLAGS, .unit="scale"},
 829     { "draw", "set draw mode", OFFSET(draw_mode), AV_OPT_TYPE_INT, {.i64 = DRAW_SCALE}, 0, DRAW_NB-1, FLAGS, .unit="draw" },
 830         { "scale", "scale pixel values for each drawn sample", 0, AV_OPT_TYPE_CONST, {.i64=DRAW_SCALE}, .flags=FLAGS, .unit="draw"},
 831         { "full",  "draw every pixel for sample directly",     0, AV_OPT_TYPE_CONST, {.i64=DRAW_FULL},  .flags=FLAGS, .unit="draw"},
 832     { "filter", "set filter mode", OFFSET(filter_mode), AV_OPT_TYPE_INT, {.i64 = FILTER_AVERAGE}, 0, FILTER_NB-1, FLAGS, .unit="filter" },
 833         { "average", "use average samples", 0, AV_OPT_TYPE_CONST, {.i64=FILTER_AVERAGE}, .flags=FLAGS, .unit="filter"},
 834         { "peak",    "use peak samples",    0, AV_OPT_TYPE_CONST, {.i64=FILTER_PEAK},    .flags=FLAGS, .unit="filter"},
 835     { NULL }
 836 };
 837
 838 AVFILTER_DEFINE_CLASS(showwavespic);
 839
 840 static int showwavespic_config_input(AVFilterLink *inlink)
 841 {
 842     AVFilterContext *ctx = inlink->dst;
 843     ShowWavesContext *showwaves = ctx->priv;
 844
 845     if (showwaves->single_pic) {
 846         showwaves->sum = av_calloc(inlink->ch_layout.nb_channels, sizeof(*showwaves->sum));
 847         if (!showwaves->sum)
 848             return AVERROR(ENOMEM);
 849     }
 850
 851     return 0;
 852 }
 853
 854 static int showwavespic_filter_frame(AVFilterLink *inlink, AVFrame *insamples)
 855 {
 856     AVFilterContext *ctx = inlink->dst;
 857     AVFilterLink *outlink = ctx->outputs[0];
 858     ShowWavesContext *showwaves = ctx->priv;
 859     int ret = 0;
 860
 861     if (showwaves->single_pic) {
 862         struct frame_node *f;
 863
 864         ret = alloc_out_frame(showwaves, outlink);
 865         if (ret < 0)
 866             goto end;
 867
 868         /* queue the audio frame */
 869         f = av_malloc(sizeof(*f));
 870         if (!f) {
 871             ret = AVERROR(ENOMEM);
 872             goto end;
 873         }
 874         f->frame = insamples;
 875         f->next = NULL;
 876         if (!showwaves->last_frame) {
 877             showwaves->audio_frames =
 878             showwaves->last_frame   = f;
 879         } else {
 880             showwaves->last_frame->next = f;
 881             showwaves->last_frame = f;
 882         }
 883         showwaves->total_samples += insamples->nb_samples;
 884
 885         return 0;
 886     }
 887
 888 end:
 889     av_frame_free(&insamples);
 890     return ret;
 891 }
 892
 893 static const AVFilterPad showwavespic_inputs[] = {
 894     {
 895         .name         = "default",
 896         .type         = AVMEDIA_TYPE_AUDIO,
 897         .config_props = showwavespic_config_input,
 898         .filter_frame = showwavespic_filter_frame,
 899     },
 900 };
 901
 902 static const AVFilterPad showwavespic_outputs[] = {
 903     {
 904         .name          = "default",
 905         .type          = AVMEDIA_TYPE_VIDEO,
 906         .config_props  = config_output,
 907         .request_frame = request_frame,
 908     },
 909 };
 910
 911 const FFFilter ff_avf_showwavespic = {
 912     .p.name        = "showwavespic",
 913     .p.description = NULL_IF_CONFIG_SMALL("Convert input audio to a video output single picture."),
 914     .p.priv_class  = &showwavespic_class,
 915     .init          = init,
 916     .uninit        = uninit,
 917     .priv_size     = sizeof(ShowWavesContext),
 918     FILTER_INPUTS(showwavespic_inputs),
 919     FILTER_OUTPUTS(showwavespic_outputs),
 920     FILTER_QUERY_FUNC2(query_formats),
 921 };
 922
 923 #endif // CONFIG_SHOWWAVESPIC_FILTER