/* * Copyright (c) 2022 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 */ #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" typedef struct Audio3dScopeContext {    const AVClass *class;    int w, h;    int size;    float fov;    float roll;    float pitch;    float yaw;    float zoom[3];    float eye[3];     AVRational frame_rate;    int nb_samples;     float view_matrix[4][4];    float projection_matrix[4][4];     AVFrame *frames[60];} Audio3dScopeContext; #define OFFSET(x) offsetof(Audio3dScopeContext, x)#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM#define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM static const AVOption a3dscope_options[] = {    { "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="hd720"}, 0, 0, FLAGS },    { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="hd720"}, 0, 0, FLAGS },    { "fov",  "set camera FoV", OFFSET(fov),    AV_OPT_TYPE_FLOAT, {.dbl=90.f},  40, 150, TFLAGS },    { "roll", "set camera roll",OFFSET(roll),   AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180, 180, TFLAGS },    { "pitch","set camera pitch",OFFSET(pitch), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180, 180, TFLAGS },    { "yaw",  "set camera yaw",  OFFSET(yaw),   AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180, 180, TFLAGS },    { "xzoom","set camera zoom", OFFSET(zoom[0]),AV_OPT_TYPE_FLOAT, {.dbl=1.f}, 0.01,  10, TFLAGS },    { "yzoom","set camera zoom", OFFSET(zoom[1]),AV_OPT_TYPE_FLOAT, {.dbl=1.f}, 0.01,  10, TFLAGS },    { "zzoom","set camera zoom", OFFSET(zoom[2]),AV_OPT_TYPE_FLOAT, {.dbl=1.f}, 0.01,  10, TFLAGS },    { "xpos", "set camera position", OFFSET(eye[0]), AV_OPT_TYPE_FLOAT, {.dbl=0.f},-60.f, 60.f, TFLAGS },    { "ypos", "set camera position", OFFSET(eye[1]), AV_OPT_TYPE_FLOAT, {.dbl=0.f},-60.f, 60.f, TFLAGS },    { "zpos", "set camera position", OFFSET(eye[2]), AV_OPT_TYPE_FLOAT, {.dbl=0.f},-60.f, 60.f, TFLAGS },    { "length","set length",    OFFSET(size),   AV_OPT_TYPE_INT,   {.i64=15},      1,  60,  FLAGS },    { NULL }}; AVFILTER_DEFINE_CLASS(a3dscope); static int query_formats(const AVFilterContext *ctx,                         AVFilterFormatsConfig **cfg_in,                         AVFilterFormatsConfig **cfg_out){    AVFilterFormats *formats = NULL;    static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, 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, &cfg_in[0]->formats)) < 0)        return ret;     formats = ff_make_format_list(pix_fmts);    if ((ret = ff_formats_ref(formats, &cfg_out[0]->formats)) < 0)        return ret;     return 0;} static int config_input(AVFilterLink *inlink){    AVFilterContext *ctx = inlink->dst;    Audio3dScopeContext *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){    FilterLink *l = ff_filter_link(outlink);    Audio3dScopeContext *s = outlink->src->priv;     outlink->w = s->w;    outlink->h = s->h;    outlink->sample_aspect_ratio = (AVRational){1,1};    l->frame_rate = s->frame_rate;    outlink->time_base = av_inv_q(l->frame_rate);     return 0;} static void projection_matrix(float fov, float a, float near, float far,                              float matrix[4][4]){    float f;     memset(matrix, 0, sizeof(*matrix));     f = 1.0f / tanf(fov * 0.5f * M_PI / 180.f);    matrix[0][0] = f * a;    matrix[1][1] = f;    matrix[2][2] = -(far + near) / (far - near);    matrix[2][3] = -1.f;    matrix[3][2] = -(near * far) / (far - near);} static inline void vmultiply(const float v[4], const float m[4][4], float d[4]){    d[0] = v[0] * m[0][0] + v[1] * m[1][0] + v[2] * m[2][0] + v[3] * m[3][0];    d[1] = v[0] * m[0][1] + v[1] * m[1][1] + v[2] * m[2][1] + v[3] * m[3][1];    d[2] = v[0] * m[0][2] + v[1] * m[1][2] + v[2] * m[2][2] + v[3] * m[3][2];    d[3] = v[0] * m[0][3] + v[1] * m[1][3] + v[2] * m[2][3] + v[3] * m[3][3];} static void mmultiply(const float m2[4][4], const float m1[4][4], float m[4][4]){    vmultiply(m2[0], m1, m[0]);    vmultiply(m2[1], m1, m[1]);    vmultiply(m2[2], m1, m[2]);    vmultiply(m2[3], m1, m[3]);} static float vdot(const float x[3], const float y[3]){    return x[0] * y[0] + x[1] * y[1] + x[2] * y[2];} static void view_matrix(const float eye[3],                        const float z[3],                        const float roll,                        const float pitch,                        const float yaw, float m[4][4]){    float cr = cosf(roll * M_PI / 180.f);    float sr = sinf(roll * M_PI / 180.f);    float cp = cosf(pitch * M_PI / 180.f);    float sp = sinf(pitch * M_PI / 180.f);    float cy = cosf(yaw * M_PI / 180.f);    float sy = sinf(yaw * M_PI / 180.f);    float t[4][4];    float rx[4][4] = {        {z[0], 0.f, 0.f, 0.f },        { 0.f, cy,  -sy, 0.f },        { 0.f, sy,   cy, 0.f },        { 0.f, 0.f, 0.f, 1.f },    };     float ry[4][4] = {        { cp,  0.f, sp,  0.f },        { 0.f,z[1], 0.f, 0.f },        {-sp,  0.f, cp,  0.f },        { 0.f, 0.f, 0.f, 1.f },    };     float rz[4][4] = {        { cr, -sr,  0.f, 0.f },        { sr,  cr,  0.f, 0.f },        { 0.f, 0.f,z[2], 0.f },        { 0.f, 0.f, 0.f, 1.f },    };     memset(m, 0, sizeof(*m));     mmultiply(rx, ry, t);    mmultiply(rz,  t, m);     m[3][0] = -vdot(m[0], eye);    m[3][1] = -vdot(m[1], eye);    m[3][2] = -vdot(m[2], eye);} static void draw_dot(AVFrame *out, unsigned x, unsigned y, float z,                     int r, int g, int b){    const ptrdiff_t linesize = out->linesize[0];    uint8_t *dst;     dst = out->data[0] + y * linesize + x * 4;    dst[0] = r * z;    dst[1] = g * z;    dst[2] = b * z;    dst[3] = 255 * z;} static int filter_frame(AVFilterLink *inlink, AVFrame *in){    AVFilterContext *ctx = inlink->dst;    AVFilterLink *outlink = ctx->outputs[0];    Audio3dScopeContext *s = ctx->priv;    const float half_height = (s->h - 1) * 0.5f;    const float half_width = (s->w - 1) * 0.5f;    float matrix[4][4];    const int w = s->w;    const int h = s->h;    AVFrame *out;     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);    if (!out) {        av_frame_free(&in);        return AVERROR(ENOMEM);    }     s->frames[0] = in;     out->sample_aspect_ratio = (AVRational){1,1};    for (int y = 0; y < outlink->h; y++)        memset(out->data[0] + y * out->linesize[0], 0, outlink->w * 4);    out->pts = av_rescale_q(in->pts, inlink->time_base, outlink->time_base);    out->duration = 1;     projection_matrix(s->fov, half_width / half_height, 0.1f, 1000000.f, s->projection_matrix);    view_matrix(s->eye, s->zoom, s->roll, s->pitch, s->yaw, s->view_matrix);    mmultiply(s->projection_matrix, s->view_matrix, matrix);     for (int nb_frame = s->size - 1; nb_frame >= 0; nb_frame--) {        const float scale = 1.f / s->nb_samples;        AVFrame *frame = s->frames[nb_frame];        float channels;         if (!frame)            continue;         channels = frame->ch_layout.nb_channels;        for (int ch = 0; ch < channels; ch++) {            const float *src = (float *)frame->extended_data[ch];            const int r = 128.f + 127.f * sinf(ch / (channels - 1) * M_PI);            const int g = 128.f + 127.f * ch / (channels - 1);            const int b = 128.f + 127.f * cosf(ch / (channels - 1) * M_PI);             for (int n = frame->nb_samples - 1, nn = s->nb_samples * nb_frame; n >= 0; n--, nn++) {                float v[4] = { src[n], ch - (channels - 1) * 0.5f, -0.1f + -nn * scale, 1.f };                float d[4];                int x, y;                 vmultiply(v, matrix, d);                 d[0] /= d[3];                d[1] /= d[3];                 x = d[0] * half_width  + half_width;                y = d[1] * half_height + half_height;                 if (x >= w || y >= h || x < 0 || y < 0)                    continue;                 draw_dot(out, x, y, av_clipf(1.f / d[3], 0.f, 1.f),                         r, g, b);            }        }    }     av_frame_free(&s->frames[59]);    memmove(&s->frames[1], &s->frames[0], 59 * sizeof(AVFrame *));    s->frames[0] = NULL;     return ff_filter_frame(outlink, out);} static int activate(AVFilterContext *ctx){    AVFilterLink *inlink = ctx->inputs[0];    AVFilterLink *outlink = ctx->outputs[0];    Audio3dScopeContext *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);     if (ff_inlink_queued_samples(inlink) >= s->nb_samples) {        ff_filter_set_ready(ctx, 10);        return 0;    }     FF_FILTER_FORWARD_STATUS(inlink, outlink);    FF_FILTER_FORWARD_WANTED(outlink, inlink);     return FFERROR_NOT_READY;} static av_cold void uninit(AVFilterContext *ctx){    Audio3dScopeContext *s = ctx->priv;     for (int n = 0; n < 60; n++)        av_frame_free(&s->frames[n]);} static const AVFilterPad audio3dscope_inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_AUDIO,        .config_props = config_input,    },}; static const AVFilterPad audio3dscope_outputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_VIDEO,        .config_props = config_output,    },}; const FFFilter ff_avf_a3dscope = {    .p.name        = "a3dscope",    .p.description = NULL_IF_CONFIG_SMALL("Convert input audio to 3d scope video output."),    .p.priv_class  = &a3dscope_class,    .uninit        = uninit,    .priv_size     = sizeof(Audio3dScopeContext),    .activate      = activate,    FILTER_INPUTS(audio3dscope_inputs),    FILTER_OUTPUTS(audio3dscope_outputs),    FILTER_QUERY_FUNC2(query_formats),    .process_command = ff_filter_process_command,};