| /* |
| * Copyright (c) 2019 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 <math.h> |
| |
| #include "libavutil/mem.h" |
| #include "libavutil/tx.h" |
| #include "libavutil/audio_fifo.h" |
| #include "libavutil/avassert.h" |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/opt.h" |
| #include "audio.h" |
| #include "formats.h" |
| #include "video.h" |
| #include "avfilter.h" |
| #include "filters.h" |
| #include "internal.h" |
| #include "window_func.h" |
| |
| typedef struct ShowSpatialContext { |
| const AVClass *class; |
| int w, h; |
| AVRational frame_rate; |
| AVTXContext *fft[2]; ///< Fast Fourier Transform context |
| AVComplexFloat *fft_data[2]; ///< bins holder for each (displayed) channels |
| AVComplexFloat *fft_tdata[2]; ///< bins holder for each (displayed) channels |
| float *window_func_lut; ///< Window function LUT |
| av_tx_fn tx_fn[2]; |
| int win_func; |
| int win_size; |
| int buf_size; |
| int consumed; |
| int hop_size; |
| AVAudioFifo *fifo; |
| int64_t pts; |
| } ShowSpatialContext; |
| |
| #define OFFSET(x) offsetof(ShowSpatialContext, x) |
| #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| |
| static const AVOption showspatial_options[] = { |
| { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "512x512"}, 0, 0, FLAGS }, |
| { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "512x512"}, 0, 0, FLAGS }, |
| { "win_size", "set window size", OFFSET(win_size), AV_OPT_TYPE_INT, {.i64 = 4096}, 1024, 65536, FLAGS }, |
| WIN_FUNC_OPTION("win_func", OFFSET(win_func), FLAGS, WFUNC_HANNING), |
| { "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 }, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(showspatial); |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| ShowSpatialContext *s = ctx->priv; |
| |
| for (int i = 0; i < 2; i++) |
| av_tx_uninit(&s->fft[i]); |
| for (int i = 0; i < 2; i++) { |
| av_freep(&s->fft_data[i]); |
| av_freep(&s->fft_tdata[i]); |
| } |
| av_freep(&s->window_func_lut); |
| av_audio_fifo_free(s->fifo); |
| } |
| |
| 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_FLTP, AV_SAMPLE_FMT_NONE }; |
| static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GBRP, 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, &(AVChannelLayout)AV_CHANNEL_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 run_channel_fft(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) |
| { |
| ShowSpatialContext *s = ctx->priv; |
| const float *window_func_lut = s->window_func_lut; |
| AVFrame *fin = arg; |
| const int ch = jobnr; |
| const float *p = (float *)fin->extended_data[ch]; |
| |
| for (int n = 0; n < fin->nb_samples; n++) { |
| s->fft_tdata[ch][n].re = p[n] * window_func_lut[n]; |
| s->fft_tdata[ch][n].im = 0.f; |
| } |
| |
| s->tx_fn[ch](s->fft[ch], s->fft_data[ch], s->fft_tdata[ch], sizeof(AVComplexFloat)); |
| |
| return 0; |
| } |
| |
| static int config_output(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| ShowSpatialContext *s = ctx->priv; |
| float overlap; |
| int ret; |
| |
| 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); |
| |
| /* (re-)configuration if the video output changed (or first init) */ |
| if (s->win_size != s->buf_size) { |
| s->buf_size = s->win_size; |
| |
| /* FFT buffers: x2 for each channel buffer. |
| * Note: we use free and malloc instead of a realloc-like function to |
| * make sure the buffer is aligned in memory for the FFT functions. */ |
| for (int i = 0; i < 2; i++) { |
| av_tx_uninit(&s->fft[i]); |
| av_freep(&s->fft_data[i]); |
| av_freep(&s->fft_tdata[i]); |
| } |
| for (int i = 0; i < 2; i++) { |
| float scale = 1.f; |
| ret = av_tx_init(&s->fft[i], &s->tx_fn[i], AV_TX_FLOAT_FFT, |
| 0, s->win_size, &scale, 0); |
| if (ret < 0) |
| return ret; |
| } |
| |
| for (int i = 0; i < 2; i++) { |
| s->fft_tdata[i] = av_calloc(s->buf_size, sizeof(**s->fft_tdata)); |
| if (!s->fft_tdata[i]) |
| return AVERROR(ENOMEM); |
| |
| s->fft_data[i] = av_calloc(s->buf_size, sizeof(**s->fft_data)); |
| if (!s->fft_data[i]) |
| return AVERROR(ENOMEM); |
| } |
| |
| /* pre-calc windowing function */ |
| s->window_func_lut = |
| av_realloc_f(s->window_func_lut, s->win_size, |
| sizeof(*s->window_func_lut)); |
| if (!s->window_func_lut) |
| return AVERROR(ENOMEM); |
| generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap); |
| |
| s->hop_size = FFMAX(1, av_rescale(inlink->sample_rate, s->frame_rate.den, s->frame_rate.num)); |
| } |
| |
| av_audio_fifo_free(s->fifo); |
| s->fifo = av_audio_fifo_alloc(inlink->format, inlink->ch_layout.nb_channels, s->win_size); |
| if (!s->fifo) |
| return AVERROR(ENOMEM); |
| return 0; |
| } |
| |
| #define RE(y, ch) s->fft_data[ch][y].re |
| #define IM(y, ch) s->fft_data[ch][y].im |
| |
| static void draw_dot(uint8_t *dst, int linesize, int value) |
| { |
| dst[0] = value; |
| dst[1] = value; |
| dst[-1] = value; |
| dst[linesize] = value; |
| dst[-linesize] = value; |
| } |
| |
| static int draw_spatial(AVFilterLink *inlink, AVFrame *insamples) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| ShowSpatialContext *s = ctx->priv; |
| AVFrame *outpicref; |
| int h = s->h - 2; |
| int w = s->w - 2; |
| int z = s->win_size / 2; |
| int64_t pts = av_rescale_q(insamples->pts, inlink->time_base, outlink->time_base); |
| |
| outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| if (!outpicref) |
| return AVERROR(ENOMEM); |
| |
| outpicref->sample_aspect_ratio = (AVRational){1,1}; |
| for (int i = 0; i < outlink->h; i++) { |
| memset(outpicref->data[0] + i * outpicref->linesize[0], 0, outlink->w); |
| memset(outpicref->data[1] + i * outpicref->linesize[1], 0, outlink->w); |
| memset(outpicref->data[2] + i * outpicref->linesize[2], 0, outlink->w); |
| } |
| |
| for (int j = 0; j < z; j++) { |
| const int idx = z - 1 - j; |
| float l = hypotf(RE(idx, 0), IM(idx, 0)); |
| float r = hypotf(RE(idx, 1), IM(idx, 1)); |
| float sum = l + r; |
| float lp = atan2f(IM(idx, 0), RE(idx, 0)); |
| float rp = atan2f(IM(idx, 1), RE(idx, 1)); |
| float diffp = ((rp - lp) / (2.f * M_PI) + 1.f) * 0.5f; |
| float diff = (sum < 0.000001f ? 0.f : (r - l) / sum) * 0.5f + 0.5f; |
| float cr = av_clipf(cbrtf(l / sum), 0, 1) * 255.f; |
| float cb = av_clipf(cbrtf(r / sum), 0, 1) * 255.f; |
| float cg; |
| int x, y; |
| |
| cg = diffp * 255.f; |
| x = av_clip(w * diff, 0, w - 2) + 1; |
| y = av_clip(h * diffp, 0, h - 2) + 1; |
| |
| draw_dot(outpicref->data[0] + outpicref->linesize[0] * y + x, outpicref->linesize[0], cg); |
| draw_dot(outpicref->data[1] + outpicref->linesize[1] * y + x, outpicref->linesize[1], cb); |
| draw_dot(outpicref->data[2] + outpicref->linesize[2] * y + x, outpicref->linesize[2], cr); |
| } |
| |
| outpicref->pts = pts; |
| outpicref->duration = 1; |
| |
| return ff_filter_frame(outlink, outpicref); |
| } |
| |
| static int spatial_activate(AVFilterContext *ctx) |
| { |
| AVFilterLink *inlink = ctx->inputs[0]; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| ShowSpatialContext *s = ctx->priv; |
| int ret; |
| |
| FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); |
| |
| if (av_audio_fifo_size(s->fifo) < s->win_size) { |
| AVFrame *frame = NULL; |
| |
| ret = ff_inlink_consume_frame(inlink, &frame); |
| if (ret < 0) |
| return ret; |
| if (ret > 0) { |
| s->pts = frame->pts; |
| s->consumed = 0; |
| |
| av_audio_fifo_write(s->fifo, (void **)frame->extended_data, frame->nb_samples); |
| av_frame_free(&frame); |
| } |
| } |
| |
| if (av_audio_fifo_size(s->fifo) >= s->win_size) { |
| AVFrame *fin = ff_get_audio_buffer(inlink, s->win_size); |
| if (!fin) |
| return AVERROR(ENOMEM); |
| |
| fin->pts = s->pts + s->consumed; |
| s->consumed += s->hop_size; |
| ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, |
| FFMIN(s->win_size, av_audio_fifo_size(s->fifo))); |
| if (ret < 0) { |
| av_frame_free(&fin); |
| return ret; |
| } |
| |
| av_assert0(fin->nb_samples == s->win_size); |
| |
| ff_filter_execute(ctx, run_channel_fft, fin, NULL, 2); |
| |
| ret = draw_spatial(inlink, fin); |
| |
| av_frame_free(&fin); |
| av_audio_fifo_drain(s->fifo, s->hop_size); |
| if (ret <= 0) |
| return ret; |
| } |
| |
| FF_FILTER_FORWARD_STATUS(inlink, outlink); |
| if (ff_outlink_frame_wanted(outlink) && av_audio_fifo_size(s->fifo) < s->win_size) { |
| ff_inlink_request_frame(inlink); |
| return 0; |
| } |
| |
| if (av_audio_fifo_size(s->fifo) >= s->win_size) { |
| ff_filter_set_ready(ctx, 10); |
| return 0; |
| } |
| return FFERROR_NOT_READY; |
| } |
| |
| static const AVFilterPad showspatial_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_output, |
| }, |
| }; |
| |
| const AVFilter ff_avf_showspatial = { |
| .name = "showspatial", |
| .description = NULL_IF_CONFIG_SMALL("Convert input audio to a spatial video output."), |
| .uninit = uninit, |
| .priv_size = sizeof(ShowSpatialContext), |
| FILTER_INPUTS(ff_audio_default_filterpad), |
| FILTER_OUTPUTS(showspatial_outputs), |
| FILTER_QUERY_FUNC(query_formats), |
| .activate = spatial_activate, |
| .priv_class = &showspatial_class, |
| .flags = AVFILTER_FLAG_SLICE_THREADS, |
| }; |