| /* |
| * 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" |
| #include "internal.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(AVFilterContext *ctx) |
| { |
| AVFilterFormats *formats = NULL; |
| AVFilterChannelLayouts *layouts = NULL; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| 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, &inlink->outcfg.formats )) < 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; |
| |
| layouts = ff_all_channel_counts(); |
| if ((ret = ff_channel_layouts_ref(layouts, &inlink->outcfg.channel_layouts)) < 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) |
| { |
| Audio3dScopeContext *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; |
| outlink->time_base = av_inv_q(outlink->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 AVFilter ff_avf_a3dscope = { |
| .name = "a3dscope", |
| .description = NULL_IF_CONFIG_SMALL("Convert input audio to 3d scope video output."), |
| .uninit = uninit, |
| .priv_size = sizeof(Audio3dScopeContext), |
| .activate = activate, |
| FILTER_INPUTS(audio3dscope_inputs), |
| FILTER_OUTPUTS(audio3dscope_outputs), |
| FILTER_QUERY_FUNC(query_formats), |
| .priv_class = &a3dscope_class, |
| .process_command = ff_filter_process_command, |
| }; |