359 lines
11 KiB
C
359 lines
11 KiB
C
/*
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* Copyright (c) 2022 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "avfilter.h"
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#include "filters.h"
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#include "formats.h"
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#include "audio.h"
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#include "video.h"
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#include "internal.h"
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typedef struct Audio3dScopeContext {
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const AVClass *class;
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int w, h;
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int size;
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float fov;
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float roll;
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float pitch;
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float yaw;
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float zoom[3];
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float eye[3];
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AVRational frame_rate;
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int nb_samples;
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float view_matrix[4][4];
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float projection_matrix[4][4];
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AVFrame *frames[60];
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} Audio3dScopeContext;
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#define OFFSET(x) offsetof(Audio3dScopeContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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#define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
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static const AVOption a3dscope_options[] = {
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{ "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
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{ "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
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{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="hd720"}, 0, 0, FLAGS },
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{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="hd720"}, 0, 0, FLAGS },
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{ "fov", "set camera FoV", OFFSET(fov), AV_OPT_TYPE_FLOAT, {.dbl=90.f}, 40, 150, TFLAGS },
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{ "roll", "set camera roll",OFFSET(roll), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180, 180, TFLAGS },
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{ "pitch","set camera pitch",OFFSET(pitch), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180, 180, TFLAGS },
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{ "yaw", "set camera yaw", OFFSET(yaw), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180, 180, TFLAGS },
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{ "xzoom","set camera zoom", OFFSET(zoom[0]),AV_OPT_TYPE_FLOAT, {.dbl=1.f}, 0.01, 10, TFLAGS },
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{ "yzoom","set camera zoom", OFFSET(zoom[1]),AV_OPT_TYPE_FLOAT, {.dbl=1.f}, 0.01, 10, TFLAGS },
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{ "zzoom","set camera zoom", OFFSET(zoom[2]),AV_OPT_TYPE_FLOAT, {.dbl=1.f}, 0.01, 10, TFLAGS },
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{ "xpos", "set camera position", OFFSET(eye[0]), AV_OPT_TYPE_FLOAT, {.dbl=0.f},-60.f, 60.f, TFLAGS },
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{ "ypos", "set camera position", OFFSET(eye[1]), AV_OPT_TYPE_FLOAT, {.dbl=0.f},-60.f, 60.f, TFLAGS },
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{ "zpos", "set camera position", OFFSET(eye[2]), AV_OPT_TYPE_FLOAT, {.dbl=0.f},-60.f, 60.f, TFLAGS },
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{ "length","set length", OFFSET(size), AV_OPT_TYPE_INT, {.i64=15}, 1, 60, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(a3dscope);
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats = NULL;
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AVFilterChannelLayouts *layouts = NULL;
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AVFilterLink *inlink = ctx->inputs[0];
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AVFilterLink *outlink = ctx->outputs[0];
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static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };
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static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
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int ret;
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formats = ff_make_format_list(sample_fmts);
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if ((ret = ff_formats_ref (formats, &inlink->outcfg.formats )) < 0)
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return ret;
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formats = ff_all_samplerates();
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if ((ret = ff_formats_ref(formats, &inlink->outcfg.samplerates)) < 0)
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return ret;
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formats = ff_make_format_list(pix_fmts);
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if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
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return ret;
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layouts = ff_all_channel_counts();
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if ((ret = ff_channel_layouts_ref(layouts, &inlink->outcfg.channel_layouts)) < 0)
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return ret;
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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Audio3dScopeContext *s = ctx->priv;
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s->nb_samples = FFMAX(1, av_rescale(inlink->sample_rate, s->frame_rate.den, s->frame_rate.num));
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return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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Audio3dScopeContext *s = outlink->src->priv;
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outlink->w = s->w;
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outlink->h = s->h;
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outlink->sample_aspect_ratio = (AVRational){1,1};
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outlink->frame_rate = s->frame_rate;
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outlink->time_base = av_inv_q(outlink->frame_rate);
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return 0;
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}
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static void projection_matrix(float fov, float a, float near, float far,
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float matrix[4][4])
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{
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float f;
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memset(matrix, 0, sizeof(*matrix));
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f = 1.0f / tanf(fov * 0.5f * M_PI / 180.f);
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matrix[0][0] = f * a;
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matrix[1][1] = f;
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matrix[2][2] = -(far + near) / (far - near);
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matrix[2][3] = -1.f;
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matrix[3][2] = -(near * far) / (far - near);
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}
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static inline void vmultiply(const float v[4], const float m[4][4], float d[4])
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{
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d[0] = v[0] * m[0][0] + v[1] * m[1][0] + v[2] * m[2][0] + v[3] * m[3][0];
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d[1] = v[0] * m[0][1] + v[1] * m[1][1] + v[2] * m[2][1] + v[3] * m[3][1];
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d[2] = v[0] * m[0][2] + v[1] * m[1][2] + v[2] * m[2][2] + v[3] * m[3][2];
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d[3] = v[0] * m[0][3] + v[1] * m[1][3] + v[2] * m[2][3] + v[3] * m[3][3];
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}
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static void mmultiply(const float m2[4][4], const float m1[4][4], float m[4][4])
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{
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vmultiply(m2[0], m1, m[0]);
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vmultiply(m2[1], m1, m[1]);
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vmultiply(m2[2], m1, m[2]);
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vmultiply(m2[3], m1, m[3]);
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}
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static float vdot(const float x[3], const float y[3])
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{
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return x[0] * y[0] + x[1] * y[1] + x[2] * y[2];
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}
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static void view_matrix(const float eye[3],
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const float z[3],
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const float roll,
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const float pitch,
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const float yaw, float m[4][4])
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{
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float cr = cosf(roll * M_PI / 180.f);
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float sr = sinf(roll * M_PI / 180.f);
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float cp = cosf(pitch * M_PI / 180.f);
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float sp = sinf(pitch * M_PI / 180.f);
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float cy = cosf(yaw * M_PI / 180.f);
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float sy = sinf(yaw * M_PI / 180.f);
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float t[4][4];
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float rx[4][4] = {
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{z[0], 0.f, 0.f, 0.f },
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{ 0.f, cy, -sy, 0.f },
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{ 0.f, sy, cy, 0.f },
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{ 0.f, 0.f, 0.f, 1.f },
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};
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float ry[4][4] = {
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{ cp, 0.f, sp, 0.f },
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{ 0.f,z[1], 0.f, 0.f },
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{-sp, 0.f, cp, 0.f },
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{ 0.f, 0.f, 0.f, 1.f },
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};
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float rz[4][4] = {
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{ cr, -sr, 0.f, 0.f },
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{ sr, cr, 0.f, 0.f },
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{ 0.f, 0.f,z[2], 0.f },
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{ 0.f, 0.f, 0.f, 1.f },
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};
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memset(m, 0, sizeof(*m));
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mmultiply(rx, ry, t);
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mmultiply(rz, t, m);
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m[3][0] = -vdot(m[0], eye);
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m[3][1] = -vdot(m[1], eye);
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m[3][2] = -vdot(m[2], eye);
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}
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static void draw_dot(AVFrame *out, unsigned x, unsigned y, float z,
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int r, int g, int b)
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{
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const ptrdiff_t linesize = out->linesize[0];
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uint8_t *dst;
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dst = out->data[0] + y * linesize + x * 4;
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dst[0] = r * z;
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dst[1] = g * z;
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dst[2] = b * z;
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dst[3] = 255 * z;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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Audio3dScopeContext *s = ctx->priv;
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const float half_height = (s->h - 1) * 0.5f;
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const float half_width = (s->w - 1) * 0.5f;
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float matrix[4][4];
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const int w = s->w;
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const int h = s->h;
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AVFrame *out;
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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s->frames[0] = in;
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out->sample_aspect_ratio = (AVRational){1,1};
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for (int y = 0; y < outlink->h; y++)
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memset(out->data[0] + y * out->linesize[0], 0, outlink->w * 4);
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out->pts = av_rescale_q(in->pts, inlink->time_base, outlink->time_base);
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out->duration = 1;
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projection_matrix(s->fov, half_width / half_height, 0.1f, 1000000.f, s->projection_matrix);
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view_matrix(s->eye, s->zoom, s->roll, s->pitch, s->yaw, s->view_matrix);
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mmultiply(s->projection_matrix, s->view_matrix, matrix);
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for (int nb_frame = s->size - 1; nb_frame >= 0; nb_frame--) {
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const float scale = 1.f / s->nb_samples;
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AVFrame *frame = s->frames[nb_frame];
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float channels;
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if (!frame)
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continue;
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channels = frame->ch_layout.nb_channels;
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for (int ch = 0; ch < channels; ch++) {
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const float *src = (float *)frame->extended_data[ch];
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const int r = 128.f + 127.f * sinf(ch / (channels - 1) * M_PI);
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const int g = 128.f + 127.f * ch / (channels - 1);
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const int b = 128.f + 127.f * cosf(ch / (channels - 1) * M_PI);
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for (int n = frame->nb_samples - 1, nn = s->nb_samples * nb_frame; n >= 0; n--, nn++) {
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float v[4] = { src[n], ch - (channels - 1) * 0.5f, -0.1f + -nn * scale, 1.f };
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float d[4];
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int x, y;
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vmultiply(v, matrix, d);
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d[0] /= d[3];
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d[1] /= d[3];
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x = d[0] * half_width + half_width;
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y = d[1] * half_height + half_height;
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if (x >= w || y >= h || x < 0 || y < 0)
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continue;
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draw_dot(out, x, y, av_clipf(1.f / d[3], 0.f, 1.f),
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r, g, b);
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}
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}
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}
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av_frame_free(&s->frames[59]);
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memmove(&s->frames[1], &s->frames[0], 59 * sizeof(AVFrame *));
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s->frames[0] = NULL;
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return ff_filter_frame(outlink, out);
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}
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static int activate(AVFilterContext *ctx)
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{
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AVFilterLink *inlink = ctx->inputs[0];
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AVFilterLink *outlink = ctx->outputs[0];
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Audio3dScopeContext *s = ctx->priv;
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AVFrame *in;
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int ret;
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FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
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ret = ff_inlink_consume_samples(inlink, s->nb_samples, s->nb_samples, &in);
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if (ret < 0)
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return ret;
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if (ret > 0)
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return filter_frame(inlink, in);
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if (ff_inlink_queued_samples(inlink) >= s->nb_samples) {
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ff_filter_set_ready(ctx, 10);
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return 0;
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}
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FF_FILTER_FORWARD_STATUS(inlink, outlink);
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FF_FILTER_FORWARD_WANTED(outlink, inlink);
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return FFERROR_NOT_READY;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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Audio3dScopeContext *s = ctx->priv;
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for (int n = 0; n < 60; n++)
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av_frame_free(&s->frames[n]);
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}
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static const AVFilterPad audio3dscope_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.config_props = config_input,
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},
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};
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static const AVFilterPad audio3dscope_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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},
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};
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const AVFilter ff_avf_a3dscope = {
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.name = "a3dscope",
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.description = NULL_IF_CONFIG_SMALL("Convert input audio to 3d scope video output."),
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.uninit = uninit,
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.priv_size = sizeof(Audio3dScopeContext),
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.activate = activate,
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FILTER_INPUTS(audio3dscope_inputs),
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FILTER_OUTPUTS(audio3dscope_outputs),
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FILTER_QUERY_FUNC(query_formats),
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.priv_class = &a3dscope_class,
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.process_command = ff_filter_process_command,
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};
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