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FFmpeg/libavfilter/f_ebur128.c

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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

  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.  * 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/ffmath.h"

  37. #include "libavutil/xga_font_data.h"

  38. #include "libavutil/opt.h"

  39. #include "libavutil/timestamp.h"

  40. #include "libswresample/swresample.h"

  41. #include "audio.h"

  42. #include "avfilter.h"

  43. #include "formats.h"

  44. #include "internal.h"

  45. 

  46. #define MAX_CHANNELS 63

  47. 

  48. /* pre-filter coefficients */

  49. #define PRE_B0  1.53512485958697

  50. #define PRE_B1 -2.69169618940638

  51. #define PRE_B2  1.19839281085285

  52. #define PRE_A1 -1.69065929318241

  53. #define PRE_A2  0.73248077421585

  54. 

  55. /* RLB-filter coefficients */

  56. #define RLB_B0  1.0

  57. #define RLB_B1 -2.0

  58. #define RLB_B2  1.0

  59. #define RLB_A1 -1.99004745483398

  60. #define RLB_A2  0.99007225036621

  61. 

  62. #define ABS_THRES    -70            ///< silence gate: we discard anything below this absolute (LUFS) threshold

  63. #define ABS_UP_THRES  10            ///< upper loud limit to consider (ABS_THRES being the minimum)

  64. #define HIST_GRAIN   100            ///< defines histogram precision

  65. #define HIST_SIZE  ((ABS_UP_THRES - ABS_THRES) * HIST_GRAIN + 1)

  66. 

  67. /**

  68.  * A histogram is an array of HIST_SIZE hist_entry storing all the energies

  69.  * recorded (with an accuracy of 1/HIST_GRAIN) of the loudnesses from ABS_THRES

  70.  * (at 0) to ABS_UP_THRES (at HIST_SIZE-1).

  71.  * This fixed-size system avoids the need of a list of energies growing

  72.  * infinitely over the time and is thus more scalable.

  73.  */

  74. struct hist_entry {

  75.     int count;                      ///< how many times the corresponding value occurred

  76.     double energy;                  ///< E = 10^((L + 0.691) / 10)

  77.     double loudness;                ///< L = -0.691 + 10 * log10(E)

  78. };

  79. 

  80. struct integrator {

  81.     double *cache[MAX_CHANNELS];    ///< window of filtered samples (N ms)

  82.     int cache_pos;                  ///< focus on the last added bin in the cache array

  83.     double sum[MAX_CHANNELS];       ///< sum of the last N ms filtered samples (cache content)

  84.     int filled;                     ///< 1 if the cache is completely filled, 0 otherwise

  85.     double rel_threshold;           ///< relative threshold

  86.     double sum_kept_powers;         ///< sum of the powers (weighted sums) above absolute threshold

  87.     int nb_kept_powers;             ///< number of sum above absolute threshold

  88.     struct hist_entry *histogram;   ///< histogram of the powers, used to compute LRA and I

  89. };

  90. 

  91. struct rect { int x, y, w, h; };

  92. 

  93. typedef struct EBUR128Context {

  94.     const AVClass *class;           ///< AVClass context for log and options purpose

  95. 

  96.     /* peak metering */

  97.     int peak_mode;                  ///< enabled peak modes

  98.     double *true_peaks;             ///< true peaks per channel

  99.     double *sample_peaks;           ///< sample peaks per channel

  100.     double *true_peaks_per_frame;   ///< true peaks in a frame per channel

  101. #if CONFIG_SWRESAMPLE

  102.     SwrContext *swr_ctx;            ///< over-sampling context for true peak metering

  103.     double *swr_buf;                ///< resampled audio data for true peak metering

  104.     int swr_linesize;

  105. #endif

  106. 

  107.     /* video  */

  108.     int do_video;                   ///< 1 if video output enabled, 0 otherwise

  109.     int w, h;                       ///< size of the video output

  110.     struct rect text;               ///< rectangle for the LU legend on the left

  111.     struct rect graph;              ///< rectangle for the main graph in the center

  112.     struct rect gauge;              ///< rectangle for the gauge on the right

  113.     AVFrame *outpicref;             ///< output picture reference, updated regularly

  114.     int meter;                      ///< select a EBU mode between +9 and +18

  115.     int scale_range;                ///< the range of LU values according to the meter

  116.     int y_zero_lu;                  ///< the y value (pixel position) for 0 LU

  117.     int *y_line_ref;                ///< y reference values for drawing the LU lines in the graph and the gauge

  118. 

  119.     /* audio */

  120.     int nb_channels;                ///< number of channels in the input

  121.     double *ch_weighting;           ///< channel weighting mapping

  122.     int sample_count;               ///< sample count used for refresh frequency, reset at refresh

  123. 

  124.     /* Filter caches.

  125.      * The mult by 3 in the following is for X[i], X[i-1] and X[i-2] */

  126.     double x[MAX_CHANNELS * 3];     ///< 3 input samples cache for each channel

  127.     double y[MAX_CHANNELS * 3];     ///< 3 pre-filter samples cache for each channel

  128.     double z[MAX_CHANNELS * 3];     ///< 3 RLB-filter samples cache for each channel

  129. 

  130. #define I400_BINS  (48000 * 4 / 10)

  131. #define I3000_BINS (48000 * 3)

  132.     struct integrator i400;         ///< 400ms integrator, used for Momentary loudness  (M), and Integrated loudness (I)

  133.     struct integrator i3000;        ///<    3s integrator, used for Short term loudness (S), and Loudness Range      (LRA)

  134. 

  135.     /* I and LRA specific */

  136.     double integrated_loudness;     ///< integrated loudness in LUFS (I)

  137.     double loudness_range;          ///< loudness range in LU (LRA)

  138.     double lra_low, lra_high;       ///< low and high LRA values

  139. 

  140.     /* misc */

  141.     int loglevel;                   ///< log level for frame logging

  142.     int metadata;                   ///< whether or not to inject loudness results in frames

  143.     int dual_mono;                  ///< whether or not to treat single channel input files as dual-mono

  144.     double pan_law;                 ///< pan law value used to calculate dual-mono measurements

  145. } EBUR128Context;

  146. 

  147. enum {

  148.     PEAK_MODE_NONE          = 0,

  149.     PEAK_MODE_SAMPLES_PEAKS = 1<<1,

  150.     PEAK_MODE_TRUE_PEAKS    = 1<<2,

  151. };

  152. 

  153. #define OFFSET(x) offsetof(EBUR128Context, x)

  154. #define A AV_OPT_FLAG_AUDIO_PARAM

  155. #define V AV_OPT_FLAG_VIDEO_PARAM

  156. #define F AV_OPT_FLAG_FILTERING_PARAM

  157. static const AVOption ebur128_options[] = {

  158.     { "video", "set video output", OFFSET(do_video), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, V|F },

  159.     { "size",  "set video size",   OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x480"}, 0, 0, V|F },

  160.     { "meter", "set scale meter (+9 to +18)",  OFFSET(meter), AV_OPT_TYPE_INT, {.i64 = 9}, 9, 18, V|F },

  161.     { "framelog", "force frame logging level", OFFSET(loglevel), AV_OPT_TYPE_INT, {.i64 = -1},   INT_MIN, INT_MAX, A|V|F, "level" },

  162.         { "info",    "information logging level", 0, AV_OPT_TYPE_CONST, {.i64 = AV_LOG_INFO},    INT_MIN, INT_MAX, A|V|F, "level" },

  163.         { "verbose", "verbose logging level",     0, AV_OPT_TYPE_CONST, {.i64 = AV_LOG_VERBOSE}, INT_MIN, INT_MAX, A|V|F, "level" },

  164.     { "metadata", "inject metadata in the filtergraph", OFFSET(metadata), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, A|V|F },

  165.     { "peak", "set peak mode", OFFSET(peak_mode), AV_OPT_TYPE_FLAGS, {.i64 = PEAK_MODE_NONE}, 0, INT_MAX, A|F, "mode" },

  166.         { "none",   "disable any peak mode",   0, AV_OPT_TYPE_CONST, {.i64 = PEAK_MODE_NONE},          INT_MIN, INT_MAX, A|F, "mode" },

  167.         { "sample", "enable peak-sample mode", 0, AV_OPT_TYPE_CONST, {.i64 = PEAK_MODE_SAMPLES_PEAKS}, INT_MIN, INT_MAX, A|F, "mode" },

  168.         { "true",   "enable true-peak mode",   0, AV_OPT_TYPE_CONST, {.i64 = PEAK_MODE_TRUE_PEAKS},    INT_MIN, INT_MAX, A|F, "mode" },

  169.     { "dualmono", "treat mono input files as dual-mono", OFFSET(dual_mono), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, A|F },

  170.     { "panlaw", "set a specific pan law for dual-mono files", OFFSET(pan_law), AV_OPT_TYPE_DOUBLE, {.dbl = -3.01029995663978}, -10.0, 0.0, A|F },

  171.     { NULL },

  172. };

  173. 

  174. AVFILTER_DEFINE_CLASS(ebur128);

  175. 

  176. static const uint8_t graph_colors[] = {

  177.     0xdd, 0x66, 0x66,   // value above 0LU non reached

  178.     0x66, 0x66, 0xdd,   // value below 0LU non reached

  179.     0x96, 0x33, 0x33,   // value above 0LU reached

  180.     0x33, 0x33, 0x96,   // value below 0LU reached

  181.     0xdd, 0x96, 0x96,   // value above 0LU line non reached

  182.     0x96, 0x96, 0xdd,   // value below 0LU line non reached

  183.     0xdd, 0x33, 0x33,   // value above 0LU line reached

  184.     0x33, 0x33, 0xdd,   // value below 0LU line reached

  185. };

  186. 

  187. static const uint8_t *get_graph_color(const EBUR128Context *ebur128, int v, int y)

  188. {

  189.     const int below0  = y > ebur128->y_zero_lu;

  190.     const int reached = y >= v;

  191.     const int line    = ebur128->y_line_ref[y] || y == ebur128->y_zero_lu;

  192.     const int colorid = 4*line + 2*reached + below0;

  193.     return graph_colors + 3*colorid;

  194. }

  195. 

  196. static inline int lu_to_y(const EBUR128Context *ebur128, double v)

  197. {

  198.     v += 2 * ebur128->meter;                            // make it in range [0;...]

  199.     v  = av_clipf(v, 0, ebur128->scale_range);          // make sure it's in the graph scale

  200.     v  = ebur128->scale_range - v;                      // invert value (y=0 is on top)

  201.     return v * ebur128->graph.h / ebur128->scale_range; // rescale from scale range to px height

  202. }

  203. 

  204. #define FONT8   0

  205. #define FONT16  1

  206. 

  207. static const uint8_t font_colors[] = {

  208.     0xdd, 0xdd, 0x00,

  209.     0x00, 0x96, 0x96,

  210. };

  211. 

  212. static void drawtext(AVFrame *pic, int x, int y, int ftid, const uint8_t *color, const char *fmt, ...)

  213. {

  214.     int i;

  215.     char buf[128] = {0};

  216.     const uint8_t *font;

  217.     int font_height;

  218.     va_list vl;

  219. 

  220.     if      (ftid == FONT16) font = avpriv_vga16_font, font_height = 16;

  221.     else if (ftid == FONT8)  font = avpriv_cga_font,   font_height =  8;

  222.     else return;

  223. 

  224.     va_start(vl, fmt);

  225.     vsnprintf(buf, sizeof(buf), fmt, vl);

  226.     va_end(vl);

  227. 

  228.     for (i = 0; buf[i]; i++) {

  229.         int char_y, mask;

  230.         uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8)*3;

  231. 

  232.         for (char_y = 0; char_y < font_height; char_y++) {

  233.             for (mask = 0x80; mask; mask >>= 1) {

  234.                 if (font[buf[i] * font_height + char_y] & mask)

  235.                     memcpy(p, color, 3);

  236.                 else

  237.                     memcpy(p, "\x00\x00\x00", 3);

  238.                 p += 3;

  239.             }

  240.             p += pic->linesize[0] - 8*3;

  241.         }

  242.     }

  243. }

  244. 

  245. static void drawline(AVFrame *pic, int x, int y, int len, int step)

  246. {

  247.     int i;

  248.     uint8_t *p = pic->data[0] + y*pic->linesize[0] + x*3;

  249. 

  250.     for (i = 0; i < len; i++) {

  251.         memcpy(p, "\x00\xff\x00", 3);

  252.         p += step;

  253.     }

  254. }

  255. 

  256. static int config_video_output(AVFilterLink *outlink)

  257. {

  258.     int i, x, y;

  259.     uint8_t *p;

  260.     AVFilterContext *ctx = outlink->src;

  261.     EBUR128Context *ebur128 = ctx->priv;

  262.     AVFrame *outpicref;

  263. 

  264.     /* check if there is enough space to represent everything decently */

  265.     if (ebur128->w < 640 || ebur128->h < 480) {

  266.         av_log(ctx, AV_LOG_ERROR, "Video size %dx%d is too small, "

  267.                "minimum size is 640x480\n", ebur128->w, ebur128->h);

  268.         return AVERROR(EINVAL);

  269.     }

  270.     outlink->w = ebur128->w;

  271.     outlink->h = ebur128->h;

  272.     outlink->sample_aspect_ratio = (AVRational){1,1};

  273. 

  274. #define PAD 8

  275. 

  276.     /* configure text area position and size */

  277.     ebur128->text.x  = PAD;

  278.     ebur128->text.y  = 40;

  279.     ebur128->text.w  = 3 * 8;   // 3 characters

  280.     ebur128->text.h  = ebur128->h - PAD - ebur128->text.y;

  281. 

  282.     /* configure gauge position and size */

  283.     ebur128->gauge.w = 20;

  284.     ebur128->gauge.h = ebur128->text.h;

  285.     ebur128->gauge.x = ebur128->w - PAD - ebur128->gauge.w;

  286.     ebur128->gauge.y = ebur128->text.y;

  287. 

  288.     /* configure graph position and size */

  289.     ebur128->graph.x = ebur128->text.x + ebur128->text.w + PAD;

  290.     ebur128->graph.y = ebur128->gauge.y;

  291.     ebur128->graph.w = ebur128->gauge.x - ebur128->graph.x - PAD;

  292.     ebur128->graph.h = ebur128->gauge.h;

  293. 

  294.     /* graph and gauge share the LU-to-pixel code */

  295.     av_assert0(ebur128->graph.h == ebur128->gauge.h);

  296. 

  297.     /* prepare the initial picref buffer */

  298.     av_frame_free(&ebur128->outpicref);

  299.     ebur128->outpicref = outpicref =

  300.         ff_get_video_buffer(outlink, outlink->w, outlink->h);

  301.     if (!outpicref)

  302.         return AVERROR(ENOMEM);

  303.     outpicref->sample_aspect_ratio = (AVRational){1,1};

  304. 

  305.     /* init y references values (to draw LU lines) */

  306.     ebur128->y_line_ref = av_calloc(ebur128->graph.h + 1, sizeof(*ebur128->y_line_ref));

  307.     if (!ebur128->y_line_ref)

  308.         return AVERROR(ENOMEM);

  309. 

  310.     /* black background */

  311.     memset(outpicref->data[0], 0, ebur128->h * outpicref->linesize[0]);

  312. 

  313.     /* draw LU legends */

  314.     drawtext(outpicref, PAD, PAD+16, FONT8, font_colors+3, " LU");

  315.     for (i = ebur128->meter; i >= -ebur128->meter * 2; i--) {

  316.         y = lu_to_y(ebur128, i);

  317.         x = PAD + (i < 10 && i > -10) * 8;

  318.         ebur128->y_line_ref[y] = i;

  319.         y -= 4; // -4 to center vertically

  320.         drawtext(outpicref, x, y + ebur128->graph.y, FONT8, font_colors+3,

  321.                  "%c%d", i < 0 ? '-' : i > 0 ? '+' : ' ', FFABS(i));

  322.     }

  323. 

  324.     /* draw graph */

  325.     ebur128->y_zero_lu = lu_to_y(ebur128, 0);

  326.     p = outpicref->data[0] + ebur128->graph.y * outpicref->linesize[0]

  327.                            + ebur128->graph.x * 3;

  328.     for (y = 0; y < ebur128->graph.h; y++) {

  329.         const uint8_t *c = get_graph_color(ebur128, INT_MAX, y);

  330. 

  331.         for (x = 0; x < ebur128->graph.w; x++)

  332.             memcpy(p + x*3, c, 3);

  333.         p += outpicref->linesize[0];

  334.     }

  335. 

  336.     /* draw fancy rectangles around the graph and the gauge */

  337. #define DRAW_RECT(r) do { \

  338.     drawline(outpicref, r.x,       r.y - 1,   r.w, 3); \

  339.     drawline(outpicref, r.x,       r.y + r.h, r.w, 3); \

  340.     drawline(outpicref, r.x - 1,   r.y,       r.h, outpicref->linesize[0]); \

  341.     drawline(outpicref, r.x + r.w, r.y,       r.h, outpicref->linesize[0]); \

  342. } while (0)

  343.     DRAW_RECT(ebur128->graph);

  344.     DRAW_RECT(ebur128->gauge);

  345. 

  346.     return 0;

  347. }

  348. 

  349. static int config_audio_input(AVFilterLink *inlink)

  350. {

  351.     AVFilterContext *ctx = inlink->dst;

  352.     EBUR128Context *ebur128 = ctx->priv;

  353. 

  354.     /* Force 100ms framing in case of metadata injection: the frames must have

  355.      * a granularity of the window overlap to be accurately exploited.

  356.      * As for the true peaks mode, it just simplifies the resampling buffer

  357.      * allocation and the lookup in it (since sample buffers differ in size, it

  358.      * can be more complex to integrate in the one-sample loop of

  359.      * filter_frame()). */

  360.     if (ebur128->metadata || (ebur128->peak_mode & PEAK_MODE_TRUE_PEAKS))

  361.         inlink->min_samples =

  362.         inlink->max_samples =

  363.         inlink->partial_buf_size = inlink->sample_rate / 10;

  364.     return 0;

  365. }

  366. 

  367. static int config_audio_output(AVFilterLink *outlink)

  368. {

  369.     int i;

  370.     AVFilterContext *ctx = outlink->src;

  371.     EBUR128Context *ebur128 = ctx->priv;

  372.     const int nb_channels = av_get_channel_layout_nb_channels(outlink->channel_layout);

  373. 

  374. #define BACK_MASK (AV_CH_BACK_LEFT    |AV_CH_BACK_CENTER    |AV_CH_BACK_RIGHT| \

  375.                    AV_CH_TOP_BACK_LEFT|AV_CH_TOP_BACK_CENTER|AV_CH_TOP_BACK_RIGHT| \

  376.                    AV_CH_SIDE_LEFT                          |AV_CH_SIDE_RIGHT| \

  377.                    AV_CH_SURROUND_DIRECT_LEFT               |AV_CH_SURROUND_DIRECT_RIGHT)

  378. 

  379.     ebur128->nb_channels  = nb_channels;

  380.     ebur128->ch_weighting = av_calloc(nb_channels, sizeof(*ebur128->ch_weighting));

  381.     if (!ebur128->ch_weighting)

  382.         return AVERROR(ENOMEM);

  383. 

  384.     for (i = 0; i < nb_channels; i++) {

  385.         /* channel weighting */

  386.         const uint16_t chl = av_channel_layout_extract_channel(outlink->channel_layout, i);

  387.         if (chl & (AV_CH_LOW_FREQUENCY|AV_CH_LOW_FREQUENCY_2)) {

  388.             ebur128->ch_weighting[i] = 0;

  389.         } else if (chl & BACK_MASK) {

  390.             ebur128->ch_weighting[i] = 1.41;

  391.         } else {

  392.             ebur128->ch_weighting[i] = 1.0;

  393.         }

  394. 

  395.         if (!ebur128->ch_weighting[i])

  396.             continue;

  397. 

  398.         /* bins buffer for the two integration window (400ms and 3s) */

  399.         ebur128->i400.cache[i]  = av_calloc(I400_BINS,  sizeof(*ebur128->i400.cache[0]));

  400.         ebur128->i3000.cache[i] = av_calloc(I3000_BINS, sizeof(*ebur128->i3000.cache[0]));

  401.         if (!ebur128->i400.cache[i] || !ebur128->i3000.cache[i])

  402.             return AVERROR(ENOMEM);

  403.     }

  404. 

  405. #if CONFIG_SWRESAMPLE

  406.     if (ebur128->peak_mode & PEAK_MODE_TRUE_PEAKS) {

  407.         int ret;

  408. 

  409.         ebur128->swr_buf    = av_malloc_array(nb_channels, 19200 * sizeof(double));

  410.         ebur128->true_peaks = av_calloc(nb_channels, sizeof(*ebur128->true_peaks));

  411.         ebur128->true_peaks_per_frame = av_calloc(nb_channels, sizeof(*ebur128->true_peaks_per_frame));

  412.         ebur128->swr_ctx    = swr_alloc();

  413.         if (!ebur128->swr_buf || !ebur128->true_peaks ||

  414.             !ebur128->true_peaks_per_frame || !ebur128->swr_ctx)

  415.             return AVERROR(ENOMEM);

  416. 

  417.         av_opt_set_int(ebur128->swr_ctx, "in_channel_layout",    outlink->channel_layout, 0);

  418.         av_opt_set_int(ebur128->swr_ctx, "in_sample_rate",       outlink->sample_rate, 0);

  419.         av_opt_set_sample_fmt(ebur128->swr_ctx, "in_sample_fmt", outlink->format, 0);

  420. 

  421.         av_opt_set_int(ebur128->swr_ctx, "out_channel_layout",    outlink->channel_layout, 0);

  422.         av_opt_set_int(ebur128->swr_ctx, "out_sample_rate",       192000, 0);

  423.         av_opt_set_sample_fmt(ebur128->swr_ctx, "out_sample_fmt", outlink->format, 0);

  424. 

  425.         ret = swr_init(ebur128->swr_ctx);

  426.         if (ret < 0)

  427.             return ret;

  428.     }

  429. #endif

  430. 

  431.     if (ebur128->peak_mode & PEAK_MODE_SAMPLES_PEAKS) {

  432.         ebur128->sample_peaks = av_calloc(nb_channels, sizeof(*ebur128->sample_peaks));

  433.         if (!ebur128->sample_peaks)

  434.             return AVERROR(ENOMEM);

  435.     }

  436. 

  437.     return 0;

  438. }

  439. 

  440. #define ENERGY(loudness) (ff_exp10(((loudness) + 0.691) / 10.))

  441. #define LOUDNESS(energy) (-0.691 + 10 * log10(energy))

  442. #define DBFS(energy) (20 * log10(energy))

  443. 

  444. static struct hist_entry *get_histogram(void)

  445. {

  446.     int i;

  447.     struct hist_entry *h = av_calloc(HIST_SIZE, sizeof(*h));

  448. 

  449.     if (!h)

  450.         return NULL;

  451.     for (i = 0; i < HIST_SIZE; i++) {

  452.         h[i].loudness = i / (double)HIST_GRAIN + ABS_THRES;

  453.         h[i].energy   = ENERGY(h[i].loudness);

  454.     }

  455.     return h;

  456. }

  457. 

  458. static av_cold int init(AVFilterContext *ctx)

  459. {

  460.     EBUR128Context *ebur128 = ctx->priv;

  461.     AVFilterPad pad;

  462.     int ret;

  463. 

  464.     if (ebur128->loglevel != AV_LOG_INFO &&

  465.         ebur128->loglevel != AV_LOG_VERBOSE) {

  466.         if (ebur128->do_video || ebur128->metadata)

  467.             ebur128->loglevel = AV_LOG_VERBOSE;

  468.         else

  469.             ebur128->loglevel = AV_LOG_INFO;

  470.     }

  471. 

  472.     if (!CONFIG_SWRESAMPLE && (ebur128->peak_mode & PEAK_MODE_TRUE_PEAKS)) {

  473.         av_log(ctx, AV_LOG_ERROR,

  474.                "True-peak mode requires libswresample to be performed\n");

  475.         return AVERROR(EINVAL);

  476.     }

  477. 

  478.     // if meter is  +9 scale, scale range is from -18 LU to  +9 LU (or 3*9)

  479.     // if meter is +18 scale, scale range is from -36 LU to +18 LU (or 3*18)

  480.     ebur128->scale_range = 3 * ebur128->meter;

  481. 

  482.     ebur128->i400.histogram  = get_histogram();

  483.     ebur128->i3000.histogram = get_histogram();

  484.     if (!ebur128->i400.histogram || !ebur128->i3000.histogram)

  485.         return AVERROR(ENOMEM);

  486. 

  487.     ebur128->integrated_loudness = ABS_THRES;

  488.     ebur128->loudness_range = 0;

  489. 

  490.     /* insert output pads */

  491.     if (ebur128->do_video) {

  492.         pad = (AVFilterPad){

  493.             .name         = av_strdup("out0"),

  494.             .type         = AVMEDIA_TYPE_VIDEO,

  495.             .config_props = config_video_output,

  496.         };

  497.         if (!pad.name)

  498.             return AVERROR(ENOMEM);

  499.         ret = ff_insert_outpad(ctx, 0, &pad);

  500.         if (ret < 0) {

  501.             av_freep(&pad.name);

  502.             return ret;

  503.         }

  504.     }

  505.     pad = (AVFilterPad){

  506.         .name         = av_asprintf("out%d", ebur128->do_video),

  507.         .type         = AVMEDIA_TYPE_AUDIO,

  508.         .config_props = config_audio_output,

  509.     };

  510.     if (!pad.name)

  511.         return AVERROR(ENOMEM);

  512.     ret = ff_insert_outpad(ctx, ebur128->do_video, &pad);

  513.     if (ret < 0) {

  514.         av_freep(&pad.name);

  515.         return ret;

  516.     }

  517. 

  518.     /* summary */

  519.     av_log(ctx, AV_LOG_VERBOSE, "EBU +%d scale\n", ebur128->meter);

  520. 

  521.     return 0;

  522. }

  523. 

  524. #define HIST_POS(power) (int)(((power) - ABS_THRES) * HIST_GRAIN)

  525. 

  526. /* loudness and power should be set such as loudness = -0.691 +

  527.  * 10*log10(power), we just avoid doing that calculus two times */

  528. static int gate_update(struct integrator *integ, double power,

  529.                        double loudness, int gate_thres)

  530. {

  531.     int ipower;

  532.     double relative_threshold;

  533.     int gate_hist_pos;

  534. 

  535.     /* update powers histograms by incrementing current power count */

  536.     ipower = av_clip(HIST_POS(loudness), 0, HIST_SIZE - 1);

  537.     integ->histogram[ipower].count++;

  538. 

  539.     /* compute relative threshold and get its position in the histogram */

  540.     integ->sum_kept_powers += power;

  541.     integ->nb_kept_powers++;

  542.     relative_threshold = integ->sum_kept_powers / integ->nb_kept_powers;

  543.     if (!relative_threshold)

  544.         relative_threshold = 1e-12;

  545.     integ->rel_threshold = LOUDNESS(relative_threshold) + gate_thres;

  546.     gate_hist_pos = av_clip(HIST_POS(integ->rel_threshold), 0, HIST_SIZE - 1);

  547. 

  548.     return gate_hist_pos;

  549. }

  550. 

  551. static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)

  552. {

  553.     int i, ch, idx_insample;

  554.     AVFilterContext *ctx = inlink->dst;

  555.     EBUR128Context *ebur128 = ctx->priv;

  556.     const int nb_channels = ebur128->nb_channels;

  557.     const int nb_samples  = insamples->nb_samples;

  558.     const double *samples = (double *)insamples->data[0];

  559.     AVFrame *pic = ebur128->outpicref;

  560. 

  561. #if CONFIG_SWRESAMPLE

  562.     if (ebur128->peak_mode & PEAK_MODE_TRUE_PEAKS) {

  563.         const double *swr_samples = ebur128->swr_buf;

  564.         int ret = swr_convert(ebur128->swr_ctx, (uint8_t**)&ebur128->swr_buf, 19200,

  565.                               (const uint8_t **)insamples->data, nb_samples);

  566.         if (ret < 0)

  567.             return ret;

  568.         for (ch = 0; ch < nb_channels; ch++)

  569.             ebur128->true_peaks_per_frame[ch] = 0.0;

  570.         for (idx_insample = 0; idx_insample < ret; idx_insample++) {

  571.             for (ch = 0; ch < nb_channels; ch++) {

  572.                 ebur128->true_peaks[ch] = FFMAX(ebur128->true_peaks[ch], fabs(*swr_samples));

  573.                 ebur128->true_peaks_per_frame[ch] = FFMAX(ebur128->true_peaks_per_frame[ch],

  574.                                                           fabs(*swr_samples));

  575.                 swr_samples++;

  576.             }

  577.         }

  578.     }

  579. #endif

  580. 

  581.     for (idx_insample = 0; idx_insample < nb_samples; idx_insample++) {

  582.         const int bin_id_400  = ebur128->i400.cache_pos;

  583.         const int bin_id_3000 = ebur128->i3000.cache_pos;

  584. 

  585. #define MOVE_TO_NEXT_CACHED_ENTRY(time) do {                \

  586.     ebur128->i##time.cache_pos++;                           \

  587.     if (ebur128->i##time.cache_pos == I##time##_BINS) {     \

  588.         ebur128->i##time.filled    = 1;                     \

  589.         ebur128->i##time.cache_pos = 0;                     \

  590.     }                                                       \

  591. } while (0)

  592. 

  593.         MOVE_TO_NEXT_CACHED_ENTRY(400);

  594.         MOVE_TO_NEXT_CACHED_ENTRY(3000);

  595. 

  596.         for (ch = 0; ch < nb_channels; ch++) {

  597.             double bin;

  598. 

  599.             if (ebur128->peak_mode & PEAK_MODE_SAMPLES_PEAKS)

  600.                 ebur128->sample_peaks[ch] = FFMAX(ebur128->sample_peaks[ch], fabs(*samples));

  601. 

  602.             ebur128->x[ch * 3] = *samples++; // set X[i]

  603. 

  604.             if (!ebur128->ch_weighting[ch])

  605.                 continue;

  606. 

  607.             /* Y[i] = X[i]*b0 + X[i-1]*b1 + X[i-2]*b2 - Y[i-1]*a1 - Y[i-2]*a2 */

  608. #define FILTER(Y, X, name) do {                                                 \

  609.             double *dst = ebur128->Y + ch*3;                                    \

  610.             double *src = ebur128->X + ch*3;                                    \

  611.             dst[2] = dst[1];                                                    \

  612.             dst[1] = dst[0];                                                    \

  613.             dst[0] = src[0]*name##_B0 + src[1]*name##_B1 + src[2]*name##_B2     \

  614.                                       - dst[1]*name##_A1 - dst[2]*name##_A2;    \

  615. } while (0)

  616. 

  617.             // TODO: merge both filters in one?

  618.             FILTER(y, x, PRE);  // apply pre-filter

  619.             ebur128->x[ch * 3 + 2] = ebur128->x[ch * 3 + 1];

  620.             ebur128->x[ch * 3 + 1] = ebur128->x[ch * 3    ];

  621.             FILTER(z, y, RLB);  // apply RLB-filter

  622. 

  623.             bin = ebur128->z[ch * 3] * ebur128->z[ch * 3];

  624. 

  625.             /* add the new value, and limit the sum to the cache size (400ms or 3s)

  626.              * by removing the oldest one */

  627.             ebur128->i400.sum [ch] = ebur128->i400.sum [ch] + bin - ebur128->i400.cache [ch][bin_id_400];

  628.             ebur128->i3000.sum[ch] = ebur128->i3000.sum[ch] + bin - ebur128->i3000.cache[ch][bin_id_3000];

  629. 

  630.             /* override old cache entry with the new value */

  631.             ebur128->i400.cache [ch][bin_id_400 ] = bin;

  632.             ebur128->i3000.cache[ch][bin_id_3000] = bin;

  633.         }

  634. 

  635.         /* For integrated loudness, gating blocks are 400ms long with 75%

  636.          * overlap (see BS.1770-2 p5), so a re-computation is needed each 100ms

  637.          * (4800 samples at 48kHz). */

  638.         if (++ebur128->sample_count == 4800) {

  639.             double loudness_400, loudness_3000;

  640.             double power_400 = 1e-12, power_3000 = 1e-12;

  641.             AVFilterLink *outlink = ctx->outputs[0];

  642.             const int64_t pts = insamples->pts +

  643.                 av_rescale_q(idx_insample, (AVRational){ 1, inlink->sample_rate },

  644.                              outlink->time_base);

  645. 

  646.             ebur128->sample_count = 0;

  647. 

  648. #define COMPUTE_LOUDNESS(m, time) do {                                              \

  649.     if (ebur128->i##time.filled) {                                                  \

  650.         /* weighting sum of the last <time> ms */                                   \

  651.         for (ch = 0; ch < nb_channels; ch++)                                        \

  652.             power_##time += ebur128->ch_weighting[ch] * ebur128->i##time.sum[ch];   \

  653.         power_##time /= I##time##_BINS;                                             \

  654.     }                                                                               \

  655.     loudness_##time = LOUDNESS(power_##time);                                       \

  656. } while (0)

  657. 

  658.             COMPUTE_LOUDNESS(M,  400);

  659.             COMPUTE_LOUDNESS(S, 3000);

  660. 

  661.             /* Integrated loudness */

  662. #define I_GATE_THRES -10  // initially defined to -8 LU in the first EBU standard

  663. 

  664.             if (loudness_400 >= ABS_THRES) {

  665.                 double integrated_sum = 0;

  666.                 int nb_integrated = 0;

  667.                 int gate_hist_pos = gate_update(&ebur128->i400, power_400,

  668.                                                 loudness_400, I_GATE_THRES);

  669. 

  670.                 /* compute integrated loudness by summing the histogram values

  671.                  * above the relative threshold */

  672.                 for (i = gate_hist_pos; i < HIST_SIZE; i++) {

  673.                     const int nb_v = ebur128->i400.histogram[i].count;

  674.                     nb_integrated  += nb_v;

  675.                     integrated_sum += nb_v * ebur128->i400.histogram[i].energy;

  676.                 }

  677.                 if (nb_integrated) {

  678.                     ebur128->integrated_loudness = LOUDNESS(integrated_sum / nb_integrated);

  679.                     /* dual-mono correction */

  680.                     if (nb_channels == 1 && ebur128->dual_mono) {

  681.                         ebur128->integrated_loudness -= ebur128->pan_law;

  682.                     }

  683.                 }

  684.             }

  685. 

  686.             /* LRA */

  687. #define LRA_GATE_THRES -20

  688. #define LRA_LOWER_PRC   10

  689. #define LRA_HIGHER_PRC  95

  690. 

  691.             /* XXX: example code in EBU 3342 is ">=" but formula in BS.1770

  692.              * specs is ">" */

  693.             if (loudness_3000 >= ABS_THRES) {

  694.                 int nb_powers = 0;

  695.                 int gate_hist_pos = gate_update(&ebur128->i3000, power_3000,

  696.                                                 loudness_3000, LRA_GATE_THRES);

  697. 

  698.                 for (i = gate_hist_pos; i < HIST_SIZE; i++)

  699.                     nb_powers += ebur128->i3000.histogram[i].count;

  700.                 if (nb_powers) {

  701.                     int n, nb_pow;

  702. 

  703.                     /* get lower loudness to consider */

  704.                     n = 0;

  705.                     nb_pow = LRA_LOWER_PRC  * nb_powers / 100. + 0.5;

  706.                     for (i = gate_hist_pos; i < HIST_SIZE; i++) {

  707.                         n += ebur128->i3000.histogram[i].count;

  708.                         if (n >= nb_pow) {

  709.                             ebur128->lra_low = ebur128->i3000.histogram[i].loudness;

  710.                             break;

  711.                         }

  712.                     }

  713. 

  714.                     /* get higher loudness to consider */

  715.                     n = nb_powers;

  716.                     nb_pow = LRA_HIGHER_PRC * nb_powers / 100. + 0.5;

  717.                     for (i = HIST_SIZE - 1; i >= 0; i--) {

  718.                         n -= ebur128->i3000.histogram[i].count;

  719.                         if (n < nb_pow) {

  720.                             ebur128->lra_high = ebur128->i3000.histogram[i].loudness;

  721.                             break;

  722.                         }

  723.                     }

  724. 

  725.                     // XXX: show low & high on the graph?

  726.                     ebur128->loudness_range = ebur128->lra_high - ebur128->lra_low;

  727.                 }

  728.             }

  729. 

  730.             /* dual-mono correction */

  731.             if (nb_channels == 1 && ebur128->dual_mono) {

  732.                 loudness_400 -= ebur128->pan_law;

  733.                 loudness_3000 -= ebur128->pan_law;

  734.             }

  735. 

  736. #define LOG_FMT "M:%6.1f S:%6.1f     I:%6.1f LUFS     LRA:%6.1f LU"

  737. 

  738.             /* push one video frame */

  739.             if (ebur128->do_video) {

  740.                 int x, y, ret;

  741.                 uint8_t *p;

  742. 

  743.                 const int y_loudness_lu_graph = lu_to_y(ebur128, loudness_3000 + 23);

  744.                 const int y_loudness_lu_gauge = lu_to_y(ebur128, loudness_400  + 23);

  745. 

  746.                 /* draw the graph using the short-term loudness */

  747.                 p = pic->data[0] + ebur128->graph.y*pic->linesize[0] + ebur128->graph.x*3;

  748.                 for (y = 0; y < ebur128->graph.h; y++) {

  749.                     const uint8_t *c = get_graph_color(ebur128, y_loudness_lu_graph, y);

  750. 

  751.                     memmove(p, p + 3, (ebur128->graph.w - 1) * 3);

  752.                     memcpy(p + (ebur128->graph.w - 1) * 3, c, 3);

  753.                     p += pic->linesize[0];

  754.                 }

  755. 

  756.                 /* draw the gauge using the momentary loudness */

  757.                 p = pic->data[0] + ebur128->gauge.y*pic->linesize[0] + ebur128->gauge.x*3;

  758.                 for (y = 0; y < ebur128->gauge.h; y++) {

  759.                     const uint8_t *c = get_graph_color(ebur128, y_loudness_lu_gauge, y);

  760. 

  761.                     for (x = 0; x < ebur128->gauge.w; x++)

  762.                         memcpy(p + x*3, c, 3);

  763.                     p += pic->linesize[0];

  764.                 }

  765. 

  766.                 /* draw textual info */

  767.                 drawtext(pic, PAD, PAD - PAD/2, FONT16, font_colors,

  768.                          LOG_FMT "     ", // padding to erase trailing characters

  769.                          loudness_400, loudness_3000,

  770.                          ebur128->integrated_loudness, ebur128->loudness_range);

  771. 

  772.                 /* set pts and push frame */

  773.                 pic->pts = pts;

  774.                 ret = ff_filter_frame(outlink, av_frame_clone(pic));

  775.                 if (ret < 0)

  776.                     return ret;

  777.             }

  778. 

  779.             if (ebur128->metadata) { /* happens only once per filter_frame call */

  780.                 char metabuf[128];

  781. #define META_PREFIX "lavfi.r128."

  782. 

  783. #define SET_META(name, var) do {                                            \

  784.     snprintf(metabuf, sizeof(metabuf), "%.3f", var);                        \

  785.     av_dict_set(&insamples->metadata, name, metabuf, 0);                    \

  786. } while (0)

  787. 

  788. #define SET_META_PEAK(name, ptype) do {                                     \

  789.     if (ebur128->peak_mode & PEAK_MODE_ ## ptype ## _PEAKS) {               \

  790.         char key[64];                                                       \

  791.         for (ch = 0; ch < nb_channels; ch++) {                              \

  792.             snprintf(key, sizeof(key),                                      \

  793.                      META_PREFIX AV_STRINGIFY(name) "_peaks_ch%d", ch);     \

  794.             SET_META(key, ebur128->name##_peaks[ch]);                       \

  795.         }                                                                   \

  796.     }                                                                       \

  797. } while (0)

  798. 

  799.                 SET_META(META_PREFIX "M",        loudness_400);

  800.                 SET_META(META_PREFIX "S",        loudness_3000);

  801.                 SET_META(META_PREFIX "I",        ebur128->integrated_loudness);

  802.                 SET_META(META_PREFIX "LRA",      ebur128->loudness_range);

  803.                 SET_META(META_PREFIX "LRA.low",  ebur128->lra_low);

  804.                 SET_META(META_PREFIX "LRA.high", ebur128->lra_high);

  805. 

  806.                 SET_META_PEAK(sample, SAMPLES);

  807.                 SET_META_PEAK(true,   TRUE);

  808.             }

  809. 

  810.             av_log(ctx, ebur128->loglevel, "t: %-10s " LOG_FMT,

  811.                    av_ts2timestr(pts, &outlink->time_base),

  812.                    loudness_400, loudness_3000,

  813.                    ebur128->integrated_loudness, ebur128->loudness_range);

  814. 

  815. #define PRINT_PEAKS(str, sp, ptype) do {                            \

  816.     if (ebur128->peak_mode & PEAK_MODE_ ## ptype ## _PEAKS) {       \

  817.         av_log(ctx, ebur128->loglevel, "  " str ":");               \

  818.         for (ch = 0; ch < nb_channels; ch++)                        \

  819.             av_log(ctx, ebur128->loglevel, " %5.1f", DBFS(sp[ch])); \

  820.         av_log(ctx, ebur128->loglevel, " dBFS");                    \

  821.     }                                                               \

  822. } while (0)

  823. 

  824.             PRINT_PEAKS("SPK", ebur128->sample_peaks, SAMPLES);

  825.             PRINT_PEAKS("FTPK", ebur128->true_peaks_per_frame, TRUE);

  826.             PRINT_PEAKS("TPK", ebur128->true_peaks,   TRUE);

  827.             av_log(ctx, ebur128->loglevel, "\n");

  828.         }

  829.     }

  830. 

  831.     return ff_filter_frame(ctx->outputs[ebur128->do_video], insamples);

  832. }

  833. 

  834. static int query_formats(AVFilterContext *ctx)

  835. {

  836.     EBUR128Context *ebur128 = ctx->priv;

  837.     AVFilterFormats *formats;

  838.     AVFilterChannelLayouts *layouts;

  839.     AVFilterLink *inlink = ctx->inputs[0];

  840.     AVFilterLink *outlink = ctx->outputs[0];

  841.     int ret;

  842. 

  843.     static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_NONE };

  844.     static const int input_srate[] = {48000, -1}; // ITU-R BS.1770 provides coeff only for 48kHz

  845.     static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE };

  846. 

  847.     /* set optional output video format */

  848.     if (ebur128->do_video) {

  849.         formats = ff_make_format_list(pix_fmts);

  850.         if ((ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)

  851.             return ret;

  852.         outlink = ctx->outputs[1];

  853.     }

  854. 

  855.     /* set input and output audio formats

  856.      * Note: ff_set_common_* functions are not used because they affect all the

  857.      * links, and thus break the video format negotiation */

  858.     formats = ff_make_format_list(sample_fmts);

  859.     if ((ret = ff_formats_ref(formats, &inlink->out_formats)) < 0 ||

  860.         (ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)

  861.         return ret;

  862. 

  863.     layouts = ff_all_channel_layouts();

  864.     if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0 ||

  865.         (ret = ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts)) < 0)

  866.         return ret;

  867. 

  868.     formats = ff_make_format_list(input_srate);

  869.     if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0 ||

  870.         (ret = ff_formats_ref(formats, &outlink->in_samplerates)) < 0)

  871.         return ret;

  872. 

  873.     return 0;

  874. }

  875. 

  876. static av_cold void uninit(AVFilterContext *ctx)

  877. {

  878.     int i;

  879.     EBUR128Context *ebur128 = ctx->priv;

  880. 

  881.     /* dual-mono correction */

  882.     if (ebur128->nb_channels == 1 && ebur128->dual_mono) {

  883.         ebur128->i400.rel_threshold -= ebur128->pan_law;

  884.         ebur128->i3000.rel_threshold -= ebur128->pan_law;

  885.         ebur128->lra_low -= ebur128->pan_law;

  886.         ebur128->lra_high -= ebur128->pan_law;

  887.     }

  888. 

  889.     av_log(ctx, AV_LOG_INFO, "Summary:\n\n"

  890.            "  Integrated loudness:\n"

  891.            "    I:         %5.1f LUFS\n"

  892.            "    Threshold: %5.1f LUFS\n\n"

  893.            "  Loudness range:\n"

  894.            "    LRA:       %5.1f LU\n"

  895.            "    Threshold: %5.1f LUFS\n"

  896.            "    LRA low:   %5.1f LUFS\n"

  897.            "    LRA high:  %5.1f LUFS",

  898.            ebur128->integrated_loudness, ebur128->i400.rel_threshold,

  899.            ebur128->loudness_range,      ebur128->i3000.rel_threshold,

  900.            ebur128->lra_low, ebur128->lra_high);

  901. 

  902. #define PRINT_PEAK_SUMMARY(str, sp, ptype) do {                  \

  903.     int ch;                                                      \

  904.     double maxpeak;                                              \

  905.     maxpeak = 0.0;                                               \

  906.     if (ebur128->peak_mode & PEAK_MODE_ ## ptype ## _PEAKS) {    \

  907.         for (ch = 0; ch < ebur128->nb_channels; ch++)            \

  908.             maxpeak = FFMAX(maxpeak, sp[ch]);                    \

  909.         av_log(ctx, AV_LOG_INFO, "\n\n  " str " peak:\n"         \

  910.                "    Peak:      %5.1f dBFS",                      \

  911.                DBFS(maxpeak));                                   \

  912.     }                                                            \

  913. } while (0)

  914. 

  915.     PRINT_PEAK_SUMMARY("Sample", ebur128->sample_peaks, SAMPLES);

  916.     PRINT_PEAK_SUMMARY("True",   ebur128->true_peaks,   TRUE);

  917.     av_log(ctx, AV_LOG_INFO, "\n");

  918. 

  919.     av_freep(&ebur128->y_line_ref);

  920.     av_freep(&ebur128->ch_weighting);

  921.     av_freep(&ebur128->true_peaks);

  922.     av_freep(&ebur128->sample_peaks);

  923.     av_freep(&ebur128->true_peaks_per_frame);

  924.     av_freep(&ebur128->i400.histogram);

  925.     av_freep(&ebur128->i3000.histogram);

  926.     for (i = 0; i < ebur128->nb_channels; i++) {

  927.         av_freep(&ebur128->i400.cache[i]);

  928.         av_freep(&ebur128->i3000.cache[i]);

  929.     }

  930.     for (i = 0; i < ctx->nb_outputs; i++)

  931.         av_freep(&ctx->output_pads[i].name);

  932.     av_frame_free(&ebur128->outpicref);

  933. #if CONFIG_SWRESAMPLE

  934.     av_freep(&ebur128->swr_buf);

  935.     swr_free(&ebur128->swr_ctx);

  936. #endif

  937. }

  938. 

  939. static const AVFilterPad ebur128_inputs[] = {

  940.     {

  941.         .name         = "default",

  942.         .type         = AVMEDIA_TYPE_AUDIO,

  943.         .filter_frame = filter_frame,

  944.         .config_props = config_audio_input,

  945.     },

  946.     { NULL }

  947. };

  948. 

  949. AVFilter ff_af_ebur128 = {

  950.     .name          = "ebur128",

  951.     .description   = NULL_IF_CONFIG_SMALL("EBU R128 scanner."),

  952.     .priv_size     = sizeof(EBUR128Context),

  953.     .init          = init,

  954.     .uninit        = uninit,

  955.     .query_formats = query_formats,

  956.     .inputs        = ebur128_inputs,

  957.     .outputs       = NULL,

  958.     .priv_class    = &ebur128_class,

  959.     .flags         = AVFILTER_FLAG_DYNAMIC_OUTPUTS,

  960. };