libavfilter/avf_avectorscope.c - manifest_repos/ffmpeg - Git at Google

 /*
  * Copyright (c) 2013 Paul B Mahol
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 /**
  * @file
  * audio to video multimedia vectorscope filter
  */

 #include "libavutil/avassert.h"
 #include "libavutil/channel_layout.h"
 #include "libavutil/opt.h"
 #include "libavutil/parseutils.h"
 #include "avfilter.h"
 #include "filters.h"
 #include "formats.h"
 #include "audio.h"
 #include "video.h"
 #include "internal.h"

 enum VectorScopeMode {
     LISSAJOUS,
     LISSAJOUS_XY,
     POLAR,
     MODE_NB,
 };

 enum VectorScopeDraw {
     DOT,
     LINE,
     DRAW_NB,
 };

 enum VectorScopeScale {
     LIN,
     SQRT,
     CBRT,
     LOG,
     SCALE_NB,
 };

 typedef struct AudioVectorScopeContext {
     const AVClass *class;
     AVFrame *outpicref;
     int w, h;
     int hw, hh;
     int mode;
     int draw;
     int scale;
     int contrast[4];
     int fade[4];
     double zoom;
     int swap;
     int mirror;
     unsigned prev_x, prev_y;
     AVRational frame_rate;
     int nb_samples;
 } AudioVectorScopeContext;

 #define OFFSET(x) offsetof(AudioVectorScopeContext, x)
 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

 static const AVOption avectorscope_options[] = {
     { "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=LISSAJOUS}, 0, MODE_NB-1, FLAGS, "mode" },
     { "m",    "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=LISSAJOUS}, 0, MODE_NB-1, FLAGS, "mode" },
     { "lissajous",    "", 0, AV_OPT_TYPE_CONST, {.i64=LISSAJOUS},    0, 0, FLAGS, "mode" },
     { "lissajous_xy", "", 0, AV_OPT_TYPE_CONST, {.i64=LISSAJOUS_XY}, 0, 0, FLAGS, "mode" },
     { "polar",        "", 0, AV_OPT_TYPE_CONST, {.i64=POLAR},        0, 0, FLAGS, "mode" },
     { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
     { "r",    "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
     { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },
     { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },
     { "rc", "set red contrast",   OFFSET(contrast[0]), AV_OPT_TYPE_INT, {.i64=40},  0, 255, FLAGS },
     { "gc", "set green contrast", OFFSET(contrast[1]), AV_OPT_TYPE_INT, {.i64=160}, 0, 255, FLAGS },
     { "bc", "set blue contrast",  OFFSET(contrast[2]), AV_OPT_TYPE_INT, {.i64=80},  0, 255, FLAGS },
     { "ac", "set alpha contrast", OFFSET(contrast[3]), AV_OPT_TYPE_INT, {.i64=255}, 0, 255, FLAGS },
     { "rf", "set red fade",       OFFSET(fade[0]), AV_OPT_TYPE_INT, {.i64=15}, 0, 255, FLAGS },
     { "gf", "set green fade",     OFFSET(fade[1]), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, FLAGS },
     { "bf", "set blue fade",      OFFSET(fade[2]), AV_OPT_TYPE_INT, {.i64=5},  0, 255, FLAGS },
     { "af", "set alpha fade",     OFFSET(fade[3]), AV_OPT_TYPE_INT, {.i64=5},  0, 255, FLAGS },
     { "zoom", "set zoom factor",  OFFSET(zoom), AV_OPT_TYPE_DOUBLE, {.dbl=1},  0, 10, FLAGS },
     { "draw", "set draw mode", OFFSET(draw), AV_OPT_TYPE_INT, {.i64=DOT}, 0, DRAW_NB-1, FLAGS, "draw" },
     { "dot",   "", 0, AV_OPT_TYPE_CONST, {.i64=DOT} , 0, 0, FLAGS, "draw" },
     { "line",  "", 0, AV_OPT_TYPE_CONST, {.i64=LINE}, 0, 0, FLAGS, "draw" },
     { "scale", "set amplitude scale mode", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=LIN}, 0, SCALE_NB-1, FLAGS, "scale" },
     { "lin",   "linear",      0, AV_OPT_TYPE_CONST, {.i64=LIN},  0, 0, FLAGS, "scale" },
     { "sqrt",  "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT}, 0, 0, FLAGS, "scale" },
     { "cbrt",  "cube root",   0, AV_OPT_TYPE_CONST, {.i64=CBRT}, 0, 0, FLAGS, "scale" },
     { "log",   "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG},  0, 0, FLAGS, "scale" },
     { "swap", "swap x axis with y axis", OFFSET(swap), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
     { "mirror", "mirror axis", OFFSET(mirror), AV_OPT_TYPE_INT, {.i64=0}, 0, 3, FLAGS, "mirror" },
     { "none",  "no mirror", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mirror" },
     { "x",  "mirror x",     0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mirror" },
     { "y",  "mirror y",     0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "mirror" },
     { "xy", "mirror both",  0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, FLAGS, "mirror" },
     { NULL }
 };

 AVFILTER_DEFINE_CLASS(avectorscope);

 static void draw_dot(AudioVectorScopeContext *s, unsigned x, unsigned y)
 {
     const int linesize = s->outpicref->linesize[0];
     uint8_t *dst;

     if (s->zoom > 1) {
         if (y >= s->h || x >= s->w)
             return;
     } else {
         y = FFMIN(y, s->h - 1);
         x = FFMIN(x, s->w - 1);
     }

     dst = &s->outpicref->data[0][y * linesize + x * 4];
     dst[0] = FFMIN(dst[0] + s->contrast[0], 255);
     dst[1] = FFMIN(dst[1] + s->contrast[1], 255);
     dst[2] = FFMIN(dst[2] + s->contrast[2], 255);
     dst[3] = FFMIN(dst[3] + s->contrast[3], 255);
 }

 static void draw_line(AudioVectorScopeContext *s, int x0, int y0, int x1, int y1)
 {
     int dx = FFABS(x1-x0), sx = x0 < x1 ? 1 : -1;
     int dy = FFABS(y1-y0), sy = y0 < y1 ? 1 : -1;
     int err = (dx>dy ? dx : -dy) / 2, e2;

     for (;;) {
         draw_dot(s, x0, y0);

         if (x0 == x1 && y0 == y1)
             break;

         e2 = err;

         if (e2 >-dx) {
             err -= dy;
             x0 += sx;
         }

         if (e2 < dy) {
             err += dx;
             y0 += sy;
         }
     }
 }

 static void fade(AudioVectorScopeContext *s)
 {
     const int linesize = s->outpicref->linesize[0];
     int i, j;

     if (s->fade[0] || s->fade[1] || s->fade[2]) {
         uint8_t *d = s->outpicref->data[0];
         for (i = 0; i < s->h; i++) {
             for (j = 0; j < s->w*4; j+=4) {
                 d[j+0] = FFMAX(d[j+0] - s->fade[0], 0);
                 d[j+1] = FFMAX(d[j+1] - s->fade[1], 0);
                 d[j+2] = FFMAX(d[j+2] - s->fade[2], 0);
                 d[j+3] = FFMAX(d[j+3] - s->fade[3], 0);
             }
             d += linesize;
         }
     }
 }

 static int query_formats(AVFilterContext *ctx)
 {
     AVFilterFormats *formats = NULL;
     AVFilterChannelLayouts *layout = NULL;
     AVFilterLink *inlink = ctx->inputs[0];
     AVFilterLink *outlink = ctx->outputs[0];
     static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE };
     static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
     int ret;

     formats = ff_make_format_list(sample_fmts);
     if ((ret = ff_formats_ref         (formats, &inlink->outcfg.formats        )) < 0 ||
         (ret = ff_add_channel_layout  (&layout, AV_CH_LAYOUT_STEREO         )) < 0 ||
         (ret = ff_channel_layouts_ref (layout , &inlink->outcfg.channel_layouts)) < 0)
         return ret;

     formats = ff_all_samplerates();
     if ((ret = ff_formats_ref(formats, &inlink->outcfg.samplerates)) < 0)
         return ret;

     formats = ff_make_format_list(pix_fmts);
     if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
         return ret;

     return 0;
 }

 static int config_input(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     AudioVectorScopeContext *s = ctx->priv;

     s->nb_samples = FFMAX(1, av_rescale(inlink->sample_rate, s->frame_rate.den, s->frame_rate.num));

     return 0;
 }

 static int config_output(AVFilterLink *outlink)
 {
     AudioVectorScopeContext *s = outlink->src->priv;

     outlink->w = s->w;
     outlink->h = s->h;
     outlink->sample_aspect_ratio = (AVRational){1,1};
     outlink->frame_rate = s->frame_rate;

     s->prev_x = s->hw = s->w / 2;
     s->prev_y = s->hh = s->mode == POLAR ? s->h - 1 : s->h / 2;

     return 0;
 }

 static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
 {
     AVFilterContext *ctx = inlink->dst;
     AVFilterLink *outlink = ctx->outputs[0];
     AudioVectorScopeContext *s = ctx->priv;
     const int hw = s->hw;
     const int hh = s->hh;
     AVFrame *clone;
     unsigned x, y;
     unsigned prev_x = s->prev_x, prev_y = s->prev_y;
     double zoom = s->zoom;
     int i;

     if (!s->outpicref || s->outpicref->width  != outlink->w ||
                          s->outpicref->height != outlink->h) {
         av_frame_free(&s->outpicref);
         s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
         if (!s->outpicref) {
             av_frame_free(&insamples);
             return AVERROR(ENOMEM);
         }

         s->outpicref->sample_aspect_ratio = (AVRational){1,1};
         for (i = 0; i < outlink->h; i++)
             memset(s->outpicref->data[0] + i * s->outpicref->linesize[0], 0, outlink->w * 4);
     }
     s->outpicref->pts = insamples->pts;

     fade(s);

     if (zoom < 1) {
         float max = 0;

         switch (insamples->format) {
         case AV_SAMPLE_FMT_S16: {
             int16_t *samples = (int16_t *)insamples->data[0];

             for (i = 0; i < insamples->nb_samples * 2; i++) {
                 float sample = samples[i] / (float)INT16_MAX;
                 max = FFMAX(FFABS(sample), max);
             }

             }
             break;
         case AV_SAMPLE_FMT_FLT: {
             float *samples = (float *)insamples->data[0];

             for (i = 0; i < insamples->nb_samples * 2; i++) {
                 max = FFMAX(FFABS(samples[i]), max);
             }
             }
             break;
         default:
             av_assert2(0);
         }

         zoom = 1. / max;
     }

     for (i = 0; i < insamples->nb_samples; i++) {
         int16_t *samples = (int16_t *)insamples->data[0] + i * 2;
         float *samplesf = (float *)insamples->data[0] + i * 2;
         float src[2];

         switch (insamples->format) {
         case AV_SAMPLE_FMT_S16:
             src[0] = samples[0] / (float)INT16_MAX;
             src[1] = samples[1] / (float)INT16_MAX;
             break;
         case AV_SAMPLE_FMT_FLT:
             src[0] = samplesf[0];
             src[1] = samplesf[1];
             break;
         default:
             av_assert2(0);
         }

         switch (s->scale) {
         case SQRT:
             src[0] = FFSIGN(src[0]) * sqrtf(FFABS(src[0]));
             src[1] = FFSIGN(src[1]) * sqrtf(FFABS(src[1]));
             break;
         case CBRT:
             src[0] = FFSIGN(src[0]) * cbrtf(FFABS(src[0]));
             src[1] = FFSIGN(src[1]) * cbrtf(FFABS(src[1]));
             break;
         case LOG:
             src[0] = FFSIGN(src[0]) * logf(1 + FFABS(src[0])) / logf(2);
             src[1] = FFSIGN(src[1]) * logf(1 + FFABS(src[1])) / logf(2);
             break;
         }

         if (s->mirror & 1)
             src[0] = -src[0];

         if (s->mirror & 2)
             src[1] = -src[1];

         if (s->swap)
             FFSWAP(float, src[0], src[1]);

         if (s->mode == LISSAJOUS) {
             x = ((src[1] - src[0]) * zoom / 2 + 1) * hw;
             y = (1.0 - (src[0] + src[1]) * zoom / 2) * hh;
         } else if (s->mode == LISSAJOUS_XY) {
             x = (src[1] * zoom + 1) * hw;
             y = (src[0] * zoom + 1) * hh;
         } else {
             float sx, sy, cx, cy;

             sx = src[1] * zoom;
             sy = src[0] * zoom;
             cx = sx * sqrtf(1 - 0.5 * sy * sy);
             cy = sy * sqrtf(1 - 0.5 * sx * sx);
             x = hw + hw * FFSIGN(cx + cy) * (cx - cy) * .7;
             y = s->h - s->h * fabsf(cx + cy) * .7;
         }

         if (s->draw == DOT) {
             draw_dot(s, x, y);
         } else {
             draw_line(s, x, y, prev_x, prev_y);
         }
         prev_x = x;
         prev_y = y;
     }

     s->prev_x = x, s->prev_y = y;
     av_frame_free(&insamples);

     clone = av_frame_clone(s->outpicref);
     if (!clone)
         return AVERROR(ENOMEM);

     return ff_filter_frame(outlink, clone);
 }

 static int activate(AVFilterContext *ctx)
 {
     AVFilterLink *inlink = ctx->inputs[0];
     AVFilterLink *outlink = ctx->outputs[0];
     AudioVectorScopeContext *s = ctx->priv;
     AVFrame *in;
     int ret;

     FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);

     ret = ff_inlink_consume_samples(inlink, s->nb_samples, s->nb_samples, &in);
     if (ret < 0)
         return ret;
     if (ret > 0)
         return filter_frame(inlink, in);

     FF_FILTER_FORWARD_STATUS(inlink, outlink);
     FF_FILTER_FORWARD_WANTED(outlink, inlink);

     return FFERROR_NOT_READY;
 }

 static av_cold void uninit(AVFilterContext *ctx)
 {
     AudioVectorScopeContext *s = ctx->priv;

     av_frame_free(&s->outpicref);
 }

 static const AVFilterPad audiovectorscope_inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_AUDIO,
         .config_props = config_input,
     },
     { NULL }
 };

 static const AVFilterPad audiovectorscope_outputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
         .config_props = config_output,
     },
     { NULL }
 };

 AVFilter ff_avf_avectorscope = {
     .name          = "avectorscope",
     .description   = NULL_IF_CONFIG_SMALL("Convert input audio to vectorscope video output."),
     .uninit        = uninit,
     .query_formats = query_formats,
     .priv_size     = sizeof(AudioVectorScopeContext),
     .activate      = activate,
     .inputs        = audiovectorscope_inputs,
     .outputs       = audiovectorscope_outputs,
     .priv_class    = &avectorscope_class,
 };
	/*
	* Copyright (c) 2013 Paul B Mahol
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* FFmpeg is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	/**
	* @file
	* audio to video multimedia vectorscope filter
	*/

	#include "libavutil/avassert.h"
	#include "libavutil/channel_layout.h"
	#include "libavutil/opt.h"
	#include "libavutil/parseutils.h"
	#include "avfilter.h"
	#include "filters.h"
	#include "formats.h"
	#include "audio.h"
	#include "video.h"
	#include "internal.h"

	enum VectorScopeMode {
	LISSAJOUS,
	LISSAJOUS_XY,
	POLAR,
	MODE_NB,
	};

	enum VectorScopeDraw {
	DOT,
	LINE,
	DRAW_NB,
	};

	enum VectorScopeScale {
	LIN,
	SQRT,
	CBRT,
	LOG,
	SCALE_NB,
	};

	typedef struct AudioVectorScopeContext {
	const AVClass *class;
	AVFrame *outpicref;
	int w, h;
	int hw, hh;
	int mode;
	int draw;
	int scale;
	int contrast[4];
	int fade[4];
	double zoom;
	int swap;
	int mirror;
	unsigned prev_x, prev_y;
	AVRational frame_rate;
	int nb_samples;
	} AudioVectorScopeContext;

	#define OFFSET(x) offsetof(AudioVectorScopeContext, x)
	#define FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM

	static const AVOption avectorscope_options[] = {
	{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=LISSAJOUS}, 0, MODE_NB-1, FLAGS, "mode" },
	{ "m", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=LISSAJOUS}, 0, MODE_NB-1, FLAGS, "mode" },
	{ "lissajous", "", 0, AV_OPT_TYPE_CONST, {.i64=LISSAJOUS}, 0, 0, FLAGS, "mode" },
	{ "lissajous_xy", "", 0, AV_OPT_TYPE_CONST, {.i64=LISSAJOUS_XY}, 0, 0, FLAGS, "mode" },
	{ "polar", "", 0, AV_OPT_TYPE_CONST, {.i64=POLAR}, 0, 0, FLAGS, "mode" },
	{ "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
	{ "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
	{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },
	{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },
	{ "rc", "set red contrast", OFFSET(contrast[0]), AV_OPT_TYPE_INT, {.i64=40}, 0, 255, FLAGS },
	{ "gc", "set green contrast", OFFSET(contrast[1]), AV_OPT_TYPE_INT, {.i64=160}, 0, 255, FLAGS },
	{ "bc", "set blue contrast", OFFSET(contrast[2]), AV_OPT_TYPE_INT, {.i64=80}, 0, 255, FLAGS },
	{ "ac", "set alpha contrast", OFFSET(contrast[3]), AV_OPT_TYPE_INT, {.i64=255}, 0, 255, FLAGS },
	{ "rf", "set red fade", OFFSET(fade[0]), AV_OPT_TYPE_INT, {.i64=15}, 0, 255, FLAGS },
	{ "gf", "set green fade", OFFSET(fade[1]), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, FLAGS },
	{ "bf", "set blue fade", OFFSET(fade[2]), AV_OPT_TYPE_INT, {.i64=5}, 0, 255, FLAGS },
	{ "af", "set alpha fade", OFFSET(fade[3]), AV_OPT_TYPE_INT, {.i64=5}, 0, 255, FLAGS },
	{ "zoom", "set zoom factor", OFFSET(zoom), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 10, FLAGS },
	{ "draw", "set draw mode", OFFSET(draw), AV_OPT_TYPE_INT, {.i64=DOT}, 0, DRAW_NB-1, FLAGS, "draw" },
	{ "dot", "", 0, AV_OPT_TYPE_CONST, {.i64=DOT} , 0, 0, FLAGS, "draw" },
	{ "line", "", 0, AV_OPT_TYPE_CONST, {.i64=LINE}, 0, 0, FLAGS, "draw" },
	{ "scale", "set amplitude scale mode", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=LIN}, 0, SCALE_NB-1, FLAGS, "scale" },
	{ "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=LIN}, 0, 0, FLAGS, "scale" },
	{ "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT}, 0, 0, FLAGS, "scale" },
	{ "cbrt", "cube root", 0, AV_OPT_TYPE_CONST, {.i64=CBRT}, 0, 0, FLAGS, "scale" },
	{ "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG}, 0, 0, FLAGS, "scale" },
	{ "swap", "swap x axis with y axis", OFFSET(swap), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
	{ "mirror", "mirror axis", OFFSET(mirror), AV_OPT_TYPE_INT, {.i64=0}, 0, 3, FLAGS, "mirror" },
	{ "none", "no mirror", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mirror" },
	{ "x", "mirror x", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mirror" },
	{ "y", "mirror y", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "mirror" },
	{ "xy", "mirror both", 0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, FLAGS, "mirror" },
	{ NULL }
	};

	AVFILTER_DEFINE_CLASS(avectorscope);

	static void draw_dot(AudioVectorScopeContext *s, unsigned x, unsigned y)
	{
	const int linesize = s->outpicref->linesize[0];
	uint8_t *dst;

	if (s->zoom > 1) {
	if (y >= s->h \|\| x >= s->w)
	return;
	} else {
	y = FFMIN(y, s->h - 1);
	x = FFMIN(x, s->w - 1);
	}

	dst = &s->outpicref->data[0][y * linesize + x * 4];
	dst[0] = FFMIN(dst[0] + s->contrast[0], 255);
	dst[1] = FFMIN(dst[1] + s->contrast[1], 255);
	dst[2] = FFMIN(dst[2] + s->contrast[2], 255);
	dst[3] = FFMIN(dst[3] + s->contrast[3], 255);
	}

	static void draw_line(AudioVectorScopeContext *s, int x0, int y0, int x1, int y1)
	{
	int dx = FFABS(x1-x0), sx = x0 < x1 ? 1 : -1;
	int dy = FFABS(y1-y0), sy = y0 < y1 ? 1 : -1;
	int err = (dx>dy ? dx : -dy) / 2, e2;

	for (;;) {
	draw_dot(s, x0, y0);

	if (x0 == x1 && y0 == y1)
	break;

	e2 = err;

	if (e2 >-dx) {
	err -= dy;
	x0 += sx;
	}

	if (e2 < dy) {
	err += dx;
	y0 += sy;
	}
	}
	}

	static void fade(AudioVectorScopeContext *s)
	{
	const int linesize = s->outpicref->linesize[0];
	int i, j;

	if (s->fade[0] \|\| s->fade[1] \|\| s->fade[2]) {
	uint8_t *d = s->outpicref->data[0];
	for (i = 0; i < s->h; i++) {
	for (j = 0; j < s->w*4; j+=4) {
	d[j+0] = FFMAX(d[j+0] - s->fade[0], 0);
	d[j+1] = FFMAX(d[j+1] - s->fade[1], 0);
	d[j+2] = FFMAX(d[j+2] - s->fade[2], 0);
	d[j+3] = FFMAX(d[j+3] - s->fade[3], 0);
	}
	d += linesize;
	}
	}
	}

	static int query_formats(AVFilterContext *ctx)
	{
	AVFilterFormats *formats = NULL;
	AVFilterChannelLayouts *layout = NULL;
	AVFilterLink *inlink = ctx->inputs[0];
	AVFilterLink *outlink = ctx->outputs[0];
	static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE };
	static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
	int ret;

	formats = ff_make_format_list(sample_fmts);
	if ((ret = ff_formats_ref (formats, &inlink->outcfg.formats )) < 0 \|\|
	(ret = ff_add_channel_layout (&layout, AV_CH_LAYOUT_STEREO )) < 0 \|\|
	(ret = ff_channel_layouts_ref (layout , &inlink->outcfg.channel_layouts)) < 0)
	return ret;

	formats = ff_all_samplerates();
	if ((ret = ff_formats_ref(formats, &inlink->outcfg.samplerates)) < 0)
	return ret;

	formats = ff_make_format_list(pix_fmts);
	if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
	return ret;

	return 0;
	}

	static int config_input(AVFilterLink *inlink)
	{
	AVFilterContext *ctx = inlink->dst;
	AudioVectorScopeContext *s = ctx->priv;

	s->nb_samples = FFMAX(1, av_rescale(inlink->sample_rate, s->frame_rate.den, s->frame_rate.num));

	return 0;
	}

	static int config_output(AVFilterLink *outlink)
	{
	AudioVectorScopeContext *s = outlink->src->priv;

	outlink->w = s->w;
	outlink->h = s->h;
	outlink->sample_aspect_ratio = (AVRational){1,1};
	outlink->frame_rate = s->frame_rate;

	s->prev_x = s->hw = s->w / 2;
	s->prev_y = s->hh = s->mode == POLAR ? s->h - 1 : s->h / 2;

	return 0;
	}

	static int filter_frame(AVFilterLink inlink, AVFrame insamples)
	{
	AVFilterContext *ctx = inlink->dst;
	AVFilterLink *outlink = ctx->outputs[0];
	AudioVectorScopeContext *s = ctx->priv;
	const int hw = s->hw;
	const int hh = s->hh;
	AVFrame *clone;
	unsigned x, y;
	unsigned prev_x = s->prev_x, prev_y = s->prev_y;
	double zoom = s->zoom;
	int i;

	if (!s->outpicref \|\| s->outpicref->width != outlink->w \|\|
	s->outpicref->height != outlink->h) {
	av_frame_free(&s->outpicref);
	s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
	if (!s->outpicref) {
	av_frame_free(&insamples);
	return AVERROR(ENOMEM);
	}

	s->outpicref->sample_aspect_ratio = (AVRational){1,1};
	for (i = 0; i < outlink->h; i++)
	memset(s->outpicref->data[0] + i * s->outpicref->linesize[0], 0, outlink->w * 4);
	}
	s->outpicref->pts = insamples->pts;

	fade(s);

	if (zoom < 1) {
	float max = 0;

	switch (insamples->format) {
	case AV_SAMPLE_FMT_S16: {
	int16_t samples = (int16_t )insamples->data[0];

	for (i = 0; i < insamples->nb_samples * 2; i++) {
	float sample = samples[i] / (float)INT16_MAX;
	max = FFMAX(FFABS(sample), max);
	}

	}
	break;
	case AV_SAMPLE_FMT_FLT: {
	float samples = (float )insamples->data[0];

	for (i = 0; i < insamples->nb_samples * 2; i++) {
	max = FFMAX(FFABS(samples[i]), max);
	}
	}
	break;
	default:
	av_assert2(0);
	}

	zoom = 1. / max;
	}

	for (i = 0; i < insamples->nb_samples; i++) {
	int16_t samples = (int16_t )insamples->data[0] + i * 2;
	float samplesf = (float )insamples->data[0] + i * 2;
	float src[2];

	switch (insamples->format) {
	case AV_SAMPLE_FMT_S16:
	src[0] = samples[0] / (float)INT16_MAX;
	src[1] = samples[1] / (float)INT16_MAX;
	break;
	case AV_SAMPLE_FMT_FLT:
	src[0] = samplesf[0];
	src[1] = samplesf[1];
	break;
	default:
	av_assert2(0);
	}

	switch (s->scale) {
	case SQRT:
	src[0] = FFSIGN(src[0]) * sqrtf(FFABS(src[0]));
	src[1] = FFSIGN(src[1]) * sqrtf(FFABS(src[1]));
	break;
	case CBRT:
	src[0] = FFSIGN(src[0]) * cbrtf(FFABS(src[0]));
	src[1] = FFSIGN(src[1]) * cbrtf(FFABS(src[1]));
	break;
	case LOG:
	src[0] = FFSIGN(src[0]) * logf(1 + FFABS(src[0])) / logf(2);
	src[1] = FFSIGN(src[1]) * logf(1 + FFABS(src[1])) / logf(2);
	break;
	}

	if (s->mirror & 1)
	src[0] = -src[0];

	if (s->mirror & 2)
	src[1] = -src[1];

	if (s->swap)
	FFSWAP(float, src[0], src[1]);

	if (s->mode == LISSAJOUS) {
	x = ((src[1] - src[0]) * zoom / 2 + 1) * hw;
	y = (1.0 - (src[0] + src[1]) * zoom / 2) * hh;
	} else if (s->mode == LISSAJOUS_XY) {
	x = (src[1] * zoom + 1) * hw;
	y = (src[0] * zoom + 1) * hh;
	} else {
	float sx, sy, cx, cy;

	sx = src[1] * zoom;
	sy = src[0] * zoom;
	cx = sx * sqrtf(1 - 0.5 * sy * sy);
	cy = sy * sqrtf(1 - 0.5 * sx * sx);
	x = hw + hw * FFSIGN(cx + cy) * (cx - cy) * .7;
	y = s->h - s->h * fabsf(cx + cy) * .7;
	}

	if (s->draw == DOT) {
	draw_dot(s, x, y);
	} else {
	draw_line(s, x, y, prev_x, prev_y);
	}
	prev_x = x;
	prev_y = y;
	}

	s->prev_x = x, s->prev_y = y;
	av_frame_free(&insamples);

	clone = av_frame_clone(s->outpicref);
	if (!clone)
	return AVERROR(ENOMEM);

	return ff_filter_frame(outlink, clone);
	}

	static int activate(AVFilterContext *ctx)
	{
	AVFilterLink *inlink = ctx->inputs[0];
	AVFilterLink *outlink = ctx->outputs[0];
	AudioVectorScopeContext *s = ctx->priv;
	AVFrame *in;
	int ret;

	FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);

	ret = ff_inlink_consume_samples(inlink, s->nb_samples, s->nb_samples, &in);
	if (ret < 0)
	return ret;
	if (ret > 0)
	return filter_frame(inlink, in);

	FF_FILTER_FORWARD_STATUS(inlink, outlink);
	FF_FILTER_FORWARD_WANTED(outlink, inlink);

	return FFERROR_NOT_READY;
	}

	static av_cold void uninit(AVFilterContext *ctx)
	{
	AudioVectorScopeContext *s = ctx->priv;

	av_frame_free(&s->outpicref);
	}

	static const AVFilterPad audiovectorscope_inputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_AUDIO,
	.config_props = config_input,
	},
	{ NULL }
	};

	static const AVFilterPad audiovectorscope_outputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.config_props = config_output,
	},
	{ NULL }
	};

	AVFilter ff_avf_avectorscope = {
	.name = "avectorscope",
	.description = NULL_IF_CONFIG_SMALL("Convert input audio to vectorscope video output."),
	.uninit = uninit,
	.query_formats = query_formats,
	.priv_size = sizeof(AudioVectorScopeContext),
	.activate = activate,
	.inputs = audiovectorscope_inputs,
	.outputs = audiovectorscope_outputs,
	.priv_class = &avectorscope_class,
	};