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Diffstat (limited to 'libavfilter/avf_showcqt.c')
| -rw-r--r-- | libavfilter/avf_showcqt.c | 696 |
1 files changed, 696 insertions, 0 deletions
diff --git a/libavfilter/avf_showcqt.c b/libavfilter/avf_showcqt.c new file mode 100644 index 0000000..60e8129 --- /dev/null +++ b/libavfilter/avf_showcqt.c @@ -0,0 +1,696 @@ +/* + * Copyright (c) 2014 Muhammad Faiz <mfcc64@gmail.com> + * + * 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 "config.h" +#include "libavcodec/avfft.h" +#include "libavutil/avassert.h" +#include "libavutil/channel_layout.h" +#include "libavutil/opt.h" +#include "libavutil/xga_font_data.h" +#include "libavutil/qsort.h" +#include "libavutil/time.h" +#include "avfilter.h" +#include "internal.h" + +#include <math.h> +#include <stdlib.h> + +#if CONFIG_LIBFREETYPE +#include <ft2build.h> +#include FT_FREETYPE_H +#endif + +/* this filter is designed to do 16 bins/semitones constant Q transform with Brown-Puckette algorithm + * start from E0 to D#10 (10 octaves) + * so there are 16 bins/semitones * 12 semitones/octaves * 10 octaves = 1920 bins + * match with full HD resolution */ + +#define VIDEO_WIDTH 1920 +#define VIDEO_HEIGHT 1080 +#define FONT_HEIGHT 32 +#define SPECTOGRAM_HEIGHT ((VIDEO_HEIGHT-FONT_HEIGHT)/2) +#define SPECTOGRAM_START (VIDEO_HEIGHT-SPECTOGRAM_HEIGHT) +#define BASE_FREQ 20.051392800492 +#define COEFF_CLAMP 1.0e-4 + +typedef struct { + FFTSample value; + int index; +} SparseCoeff; + +typedef struct { + const AVClass *class; + AVFrame *outpicref; + FFTContext *fft_context; + FFTComplex *fft_data; + FFTComplex *fft_result_left; + FFTComplex *fft_result_right; + uint8_t *spectogram; + SparseCoeff *coeff_sort; + SparseCoeff *coeffs[VIDEO_WIDTH]; + uint8_t *font_alpha; + char *fontfile; /* using freetype */ + int coeffs_len[VIDEO_WIDTH]; + uint8_t font_color[VIDEO_WIDTH]; + int64_t frame_count; + int spectogram_count; + int spectogram_index; + int fft_bits; + int req_fullfilled; + int remaining_fill; + double volume; + double timeclamp; /* lower timeclamp, time-accurate, higher timeclamp, freq-accurate (at low freq)*/ + float coeffclamp; /* lower coeffclamp, more precise, higher coeffclamp, faster */ + int fullhd; /* if true, output video is at full HD resolution, otherwise it will be halved */ + float gamma; /* lower gamma, more contrast, higher gamma, more range */ + int fps; /* the required fps is so strict, so it's enough to be int, but 24000/1001 etc cannot be encoded */ + int count; /* fps * count = transform rate */ +} ShowCQTContext; + +#define OFFSET(x) offsetof(ShowCQTContext, x) +#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM + +static const AVOption showcqt_options[] = { + { "volume", "set volume", OFFSET(volume), AV_OPT_TYPE_DOUBLE, { .dbl = 16 }, 0.1, 100, FLAGS }, + { "timeclamp", "set timeclamp", OFFSET(timeclamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.17 }, 0.1, 1.0, FLAGS }, + { "coeffclamp", "set coeffclamp", OFFSET(coeffclamp), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 0.1, 10, FLAGS }, + { "gamma", "set gamma", OFFSET(gamma), AV_OPT_TYPE_FLOAT, { .dbl = 3 }, 1, 7, FLAGS }, + { "fullhd", "set full HD resolution", OFFSET(fullhd), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS }, + { "fps", "set video fps", OFFSET(fps), AV_OPT_TYPE_INT, { .i64 = 25 }, 10, 100, FLAGS }, + { "count", "set number of transform per frame", OFFSET(count), AV_OPT_TYPE_INT, { .i64 = 6 }, 1, 30, FLAGS }, + { "fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, FLAGS }, + { NULL } +}; + +AVFILTER_DEFINE_CLASS(showcqt); + +static av_cold void uninit(AVFilterContext *ctx) +{ + int k; + + ShowCQTContext *s = ctx->priv; + av_fft_end(s->fft_context); + s->fft_context = NULL; + for (k = 0; k < VIDEO_WIDTH; k++) + av_freep(&s->coeffs[k]); + av_freep(&s->fft_data); + av_freep(&s->fft_result_left); + av_freep(&s->fft_result_right); + av_freep(&s->coeff_sort); + av_freep(&s->spectogram); + av_freep(&s->font_alpha); + av_frame_free(&s->outpicref); +} + +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_FLT, AV_SAMPLE_FMT_NONE }; + static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE }; + static const int64_t channel_layouts[] = { AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_STEREO_DOWNMIX, -1 }; + static const int samplerates[] = { 44100, 48000, -1 }; + + /* set input audio formats */ + formats = ff_make_format_list(sample_fmts); + if (!formats) + return AVERROR(ENOMEM); + ff_formats_ref(formats, &inlink->out_formats); + + layouts = avfilter_make_format64_list(channel_layouts); + if (!layouts) + return AVERROR(ENOMEM); + ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts); + + formats = ff_make_format_list(samplerates); + if (!formats) + return AVERROR(ENOMEM); + ff_formats_ref(formats, &inlink->out_samplerates); + + /* set output video format */ + formats = ff_make_format_list(pix_fmts); + if (!formats) + return AVERROR(ENOMEM); + ff_formats_ref(formats, &outlink->in_formats); + + return 0; +} + +#if CONFIG_LIBFREETYPE +static void load_freetype_font(AVFilterContext *ctx) +{ + static const char str[] = "EF G A BC D "; + ShowCQTContext *s = ctx->priv; + FT_Library lib = NULL; + FT_Face face = NULL; + int video_scale = s->fullhd ? 2 : 1; + int video_width = (VIDEO_WIDTH/2) * video_scale; + int font_height = (FONT_HEIGHT/2) * video_scale; + int font_width = 8 * video_scale; + int font_repeat = font_width * 12; + int linear_hori_advance = font_width * 65536; + int non_monospace_warning = 0; + int x; + + s->font_alpha = NULL; + + if (!s->fontfile) + return; + + if (FT_Init_FreeType(&lib)) + goto fail; + + if (FT_New_Face(lib, s->fontfile, 0, &face)) + goto fail; + + if (FT_Set_Char_Size(face, 16*64, 0, 0, 0)) + goto fail; + + if (FT_Load_Char(face, 'A', FT_LOAD_RENDER)) + goto fail; + + if (FT_Set_Char_Size(face, 16*64 * linear_hori_advance / face->glyph->linearHoriAdvance, 0, 0, 0)) + goto fail; + + s->font_alpha = av_malloc(font_height * video_width); + if (!s->font_alpha) + goto fail; + + memset(s->font_alpha, 0, font_height * video_width); + + for (x = 0; x < 12; x++) { + int sx, sy, rx, bx, by, dx, dy; + + if (str[x] == ' ') + continue; + + if (FT_Load_Char(face, str[x], FT_LOAD_RENDER)) + goto fail; + + if (face->glyph->advance.x != font_width*64 && !non_monospace_warning) { + av_log(ctx, AV_LOG_WARNING, "Font is not monospace\n"); + non_monospace_warning = 1; + } + + sy = font_height - 4*video_scale - face->glyph->bitmap_top; + for (rx = 0; rx < 10; rx++) { + sx = rx * font_repeat + x * font_width + face->glyph->bitmap_left; + for (by = 0; by < face->glyph->bitmap.rows; by++) { + dy = by + sy; + if (dy < 0) + continue; + if (dy >= font_height) + break; + + for (bx = 0; bx < face->glyph->bitmap.width; bx++) { + dx = bx + sx; + if (dx < 0) + continue; + if (dx >= video_width) + break; + s->font_alpha[dy*video_width+dx] = face->glyph->bitmap.buffer[by*face->glyph->bitmap.width+bx]; + } + } + } + } + + FT_Done_Face(face); + FT_Done_FreeType(lib); + return; + + fail: + av_log(ctx, AV_LOG_WARNING, "Error while loading freetype font, using default font instead\n"); + FT_Done_Face(face); + FT_Done_FreeType(lib); + av_freep(&s->font_alpha); + return; +} +#endif + +static inline int qsort_sparsecoeff(const SparseCoeff *a, const SparseCoeff *b) +{ + if (fabsf(a->value) >= fabsf(b->value)) + return 1; + else + return -1; +} + +static int config_output(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + AVFilterLink *inlink = ctx->inputs[0]; + ShowCQTContext *s = ctx->priv; + int fft_len, k, x, y; + int num_coeffs = 0; + int rate = inlink->sample_rate; + double max_len = rate * (double) s->timeclamp; + int64_t start_time, end_time; + int video_scale = s->fullhd ? 2 : 1; + int video_width = (VIDEO_WIDTH/2) * video_scale; + int video_height = (VIDEO_HEIGHT/2) * video_scale; + int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale; + + s->fft_bits = ceil(log2(max_len)); + fft_len = 1 << s->fft_bits; + + if (rate % (s->fps * s->count)) { + av_log(ctx, AV_LOG_ERROR, "Rate (%u) is not divisible by fps*count (%u*%u)\n", rate, s->fps, s->count); + return AVERROR(EINVAL); + } + + s->fft_data = av_malloc_array(fft_len, sizeof(*s->fft_data)); + s->coeff_sort = av_malloc_array(fft_len, sizeof(*s->coeff_sort)); + s->fft_result_left = av_malloc_array(fft_len, sizeof(*s->fft_result_left)); + s->fft_result_right = av_malloc_array(fft_len, sizeof(*s->fft_result_right)); + s->fft_context = av_fft_init(s->fft_bits, 0); + + if (!s->fft_data || !s->coeff_sort || !s->fft_result_left || !s->fft_result_right || !s->fft_context) + return AVERROR(ENOMEM); + + /* initializing font */ + for (x = 0; x < video_width; x++) { + if (x >= (12*3+8)*8*video_scale && x < (12*4+8)*8*video_scale) { + float fx = (x-(12*3+8)*8*video_scale) * (2.0f/(192.0f*video_scale)); + float sv = sinf(M_PI*fx); + s->font_color[x] = sv*sv*255.0f + 0.5f; + } else { + s->font_color[x] = 0; + } + } + +#if CONFIG_LIBFREETYPE + load_freetype_font(ctx); +#else + if (s->fontfile) + av_log(ctx, AV_LOG_WARNING, "Freetype is not available, ignoring fontfile option\n"); + s->font_alpha = NULL; +#endif + + av_log(ctx, AV_LOG_INFO, "Calculating spectral kernel, please wait\n"); + start_time = av_gettime_relative(); + for (k = 0; k < VIDEO_WIDTH; k++) { + int hlen = fft_len >> 1; + float total = 0; + float partial = 0; + double freq = BASE_FREQ * exp2(k * (1.0/192.0)); + double tlen = rate * (24.0 * 16.0) /freq; + /* a window function from Albert H. Nuttall, + * "Some Windows with Very Good Sidelobe Behavior" + * -93.32 dB peak sidelobe and 18 dB/octave asymptotic decay + * coefficient normalized to a0 = 1 */ + double a0 = 0.355768; + double a1 = 0.487396/a0; + double a2 = 0.144232/a0; + double a3 = 0.012604/a0; + double sv_step, cv_step, sv, cv; + double sw_step, cw_step, sw, cw, w; + + tlen = tlen * max_len / (tlen + max_len); + s->fft_data[0].re = 0; + s->fft_data[0].im = 0; + s->fft_data[hlen].re = (1.0 + a1 + a2 + a3) * (1.0/tlen) * s->volume * (1.0/fft_len); + s->fft_data[hlen].im = 0; + sv_step = sv = sin(2.0*M_PI*freq*(1.0/rate)); + cv_step = cv = cos(2.0*M_PI*freq*(1.0/rate)); + /* also optimizing window func */ + sw_step = sw = sin(2.0*M_PI*(1.0/tlen)); + cw_step = cw = cos(2.0*M_PI*(1.0/tlen)); + for (x = 1; x < 0.5 * tlen; x++) { + double cv_tmp, cw_tmp; + double cw2, cw3, sw2; + + cw2 = cw * cw - sw * sw; + sw2 = cw * sw + sw * cw; + cw3 = cw * cw2 - sw * sw2; + w = (1.0 + a1 * cw + a2 * cw2 + a3 * cw3) * (1.0/tlen) * s->volume * (1.0/fft_len); + s->fft_data[hlen + x].re = w * cv; + s->fft_data[hlen + x].im = w * sv; + s->fft_data[hlen - x].re = s->fft_data[hlen + x].re; + s->fft_data[hlen - x].im = -s->fft_data[hlen + x].im; + + cv_tmp = cv * cv_step - sv * sv_step; + sv = sv * cv_step + cv * sv_step; + cv = cv_tmp; + cw_tmp = cw * cw_step - sw * sw_step; + sw = sw * cw_step + cw * sw_step; + cw = cw_tmp; + } + for (; x < hlen; x++) { + s->fft_data[hlen + x].re = 0; + s->fft_data[hlen + x].im = 0; + s->fft_data[hlen - x].re = 0; + s->fft_data[hlen - x].im = 0; + } + av_fft_permute(s->fft_context, s->fft_data); + av_fft_calc(s->fft_context, s->fft_data); + + for (x = 0; x < fft_len; x++) { + s->coeff_sort[x].index = x; + s->coeff_sort[x].value = s->fft_data[x].re; + } + + AV_QSORT(s->coeff_sort, fft_len, SparseCoeff, qsort_sparsecoeff); + for (x = 0; x < fft_len; x++) + total += fabsf(s->coeff_sort[x].value); + + for (x = 0; x < fft_len; x++) { + partial += fabsf(s->coeff_sort[x].value); + if (partial > total * s->coeffclamp * COEFF_CLAMP) { + s->coeffs_len[k] = fft_len - x; + num_coeffs += s->coeffs_len[k]; + s->coeffs[k] = av_malloc_array(s->coeffs_len[k], sizeof(*s->coeffs[k])); + if (!s->coeffs[k]) + return AVERROR(ENOMEM); + for (y = 0; y < s->coeffs_len[k]; y++) + s->coeffs[k][y] = s->coeff_sort[x+y]; + break; + } + } + } + end_time = av_gettime_relative(); + av_log(ctx, AV_LOG_INFO, "Elapsed time %.6f s (fft_len=%u, num_coeffs=%u)\n", 1e-6 * (end_time-start_time), fft_len, num_coeffs); + + outlink->w = video_width; + outlink->h = video_height; + + s->req_fullfilled = 0; + s->spectogram_index = 0; + s->frame_count = 0; + s->spectogram_count = 0; + s->remaining_fill = fft_len >> 1; + memset(s->fft_data, 0, fft_len * sizeof(*s->fft_data)); + + s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!s->outpicref) + return AVERROR(ENOMEM); + + s->spectogram = av_calloc(spectogram_height, s->outpicref->linesize[0]); + if (!s->spectogram) + return AVERROR(ENOMEM); + + outlink->sample_aspect_ratio = av_make_q(1, 1); + outlink->time_base = av_make_q(1, s->fps); + outlink->frame_rate = av_make_q(s->fps, 1); + return 0; +} + +static int plot_cqt(AVFilterLink *inlink) +{ + AVFilterContext *ctx = inlink->dst; + ShowCQTContext *s = ctx->priv; + AVFilterLink *outlink = ctx->outputs[0]; + int fft_len = 1 << s->fft_bits; + FFTSample result[VIDEO_WIDTH][4]; + int x, y, ret = 0; + int linesize = s->outpicref->linesize[0]; + int video_scale = s->fullhd ? 2 : 1; + int video_width = (VIDEO_WIDTH/2) * video_scale; + int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale; + int spectogram_start = (SPECTOGRAM_START/2) * video_scale; + int font_height = (FONT_HEIGHT/2) * video_scale; + + /* real part contains left samples, imaginary part contains right samples */ + memcpy(s->fft_result_left, s->fft_data, fft_len * sizeof(*s->fft_data)); + av_fft_permute(s->fft_context, s->fft_result_left); + av_fft_calc(s->fft_context, s->fft_result_left); + + /* separate left and right, (and multiply by 2.0) */ + s->fft_result_right[0].re = 2.0f * s->fft_result_left[0].im; + s->fft_result_right[0].im = 0; + s->fft_result_left[0].re = 2.0f * s->fft_result_left[0].re; + s->fft_result_left[0].im = 0; + for (x = 1; x <= fft_len >> 1; x++) { + FFTSample tmpy = s->fft_result_left[fft_len-x].im - s->fft_result_left[x].im; + + s->fft_result_right[x].re = s->fft_result_left[x].im + s->fft_result_left[fft_len-x].im; + s->fft_result_right[x].im = s->fft_result_left[x].re - s->fft_result_left[fft_len-x].re; + s->fft_result_right[fft_len-x].re = s->fft_result_right[x].re; + s->fft_result_right[fft_len-x].im = -s->fft_result_right[x].im; + + s->fft_result_left[x].re = s->fft_result_left[x].re + s->fft_result_left[fft_len-x].re; + s->fft_result_left[x].im = tmpy; + s->fft_result_left[fft_len-x].re = s->fft_result_left[x].re; + s->fft_result_left[fft_len-x].im = -s->fft_result_left[x].im; + } + + /* calculating cqt */ + for (x = 0; x < VIDEO_WIDTH; x++) { + int u; + float g = 1.0f / s->gamma; + FFTComplex l = {0,0}; + FFTComplex r = {0,0}; + + for (u = 0; u < s->coeffs_len[x]; u++) { + FFTSample value = s->coeffs[x][u].value; + int index = s->coeffs[x][u].index; + l.re += value * s->fft_result_left[index].re; + l.im += value * s->fft_result_left[index].im; + r.re += value * s->fft_result_right[index].re; + r.im += value * s->fft_result_right[index].im; + } + /* result is power, not amplitude */ + result[x][0] = l.re * l.re + l.im * l.im; + result[x][2] = r.re * r.re + r.im * r.im; + result[x][1] = 0.5f * (result[x][0] + result[x][2]); + result[x][3] = result[x][1]; + result[x][0] = 255.0f * powf(FFMIN(1.0f,result[x][0]), g); + result[x][1] = 255.0f * powf(FFMIN(1.0f,result[x][1]), g); + result[x][2] = 255.0f * powf(FFMIN(1.0f,result[x][2]), g); + } + + if (!s->fullhd) { + for (x = 0; x < video_width; x++) { + result[x][0] = 0.5f * (result[2*x][0] + result[2*x+1][0]); + result[x][1] = 0.5f * (result[2*x][1] + result[2*x+1][1]); + result[x][2] = 0.5f * (result[2*x][2] + result[2*x+1][2]); + result[x][3] = 0.5f * (result[2*x][3] + result[2*x+1][3]); + } + } + + for (x = 0; x < video_width; x++) { + s->spectogram[s->spectogram_index*linesize + 3*x] = result[x][0] + 0.5f; + s->spectogram[s->spectogram_index*linesize + 3*x + 1] = result[x][1] + 0.5f; + s->spectogram[s->spectogram_index*linesize + 3*x + 2] = result[x][2] + 0.5f; + } + + /* drawing */ + if (!s->spectogram_count) { + uint8_t *data = (uint8_t*) s->outpicref->data[0]; + float rcp_result[VIDEO_WIDTH]; + int total_length = linesize * spectogram_height; + int back_length = linesize * s->spectogram_index; + + for (x = 0; x < video_width; x++) + rcp_result[x] = 1.0f / (result[x][3]+0.0001f); + + /* drawing bar */ + for (y = 0; y < spectogram_height; y++) { + float height = (spectogram_height - y) * (1.0f/spectogram_height); + uint8_t *lineptr = data + y * linesize; + for (x = 0; x < video_width; x++) { + float mul; + if (result[x][3] <= height) { + *lineptr++ = 0; + *lineptr++ = 0; + *lineptr++ = 0; + } else { + mul = (result[x][3] - height) * rcp_result[x]; + *lineptr++ = mul * result[x][0] + 0.5f; + *lineptr++ = mul * result[x][1] + 0.5f; + *lineptr++ = mul * result[x][2] + 0.5f; + } + } + } + + /* drawing font */ + if (s->font_alpha) { + for (y = 0; y < font_height; y++) { + uint8_t *lineptr = data + (spectogram_height + y) * linesize; + uint8_t *spectogram_src = s->spectogram + s->spectogram_index * linesize; + for (x = 0; x < video_width; x++) { + uint8_t alpha = s->font_alpha[y*video_width+x]; + uint8_t color = s->font_color[x]; + lineptr[3*x] = (spectogram_src[3*x] * (255-alpha) + (255-color) * alpha + 255) >> 8; + lineptr[3*x+1] = (spectogram_src[3*x+1] * (255-alpha) + 255) >> 8; + lineptr[3*x+2] = (spectogram_src[3*x+2] * (255-alpha) + color * alpha + 255) >> 8; + } + } + } else { + for (y = 0; y < font_height; y++) { + uint8_t *lineptr = data + (spectogram_height + y) * linesize; + memcpy(lineptr, s->spectogram + s->spectogram_index * linesize, video_width*3); + } + for (x = 0; x < video_width; x += video_width/10) { + int u; + static const char str[] = "EF G A BC D "; + uint8_t *startptr = data + spectogram_height * linesize + x * 3; + for (u = 0; str[u]; u++) { + int v; + for (v = 0; v < 16; v++) { + uint8_t *p = startptr + v * linesize * video_scale + 8 * 3 * u * video_scale; + int ux = x + 8 * u * video_scale; + int mask; + for (mask = 0x80; mask; mask >>= 1) { + if (mask & avpriv_vga16_font[str[u] * 16 + v]) { + p[0] = 255 - s->font_color[ux]; + p[1] = 0; + p[2] = s->font_color[ux]; + if (video_scale == 2) { + p[linesize] = p[0]; + p[linesize+1] = p[1]; + p[linesize+2] = p[2]; + p[3] = p[linesize+3] = 255 - s->font_color[ux+1]; + p[4] = p[linesize+4] = 0; + p[5] = p[linesize+5] = s->font_color[ux+1]; + } + } + p += 3 * video_scale; + ux += video_scale; + } + } + } + } + } + + /* drawing spectogram/sonogram */ + data += spectogram_start * linesize; + memcpy(data, s->spectogram + s->spectogram_index*linesize, total_length - back_length); + + data += total_length - back_length; + if (back_length) + memcpy(data, s->spectogram, back_length); + + s->outpicref->pts = s->frame_count; + ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref)); + s->req_fullfilled = 1; + s->frame_count++; + } + s->spectogram_count = (s->spectogram_count + 1) % s->count; + s->spectogram_index = (s->spectogram_index + spectogram_height - 1) % spectogram_height; + return ret; +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *insamples) +{ + AVFilterContext *ctx = inlink->dst; + ShowCQTContext *s = ctx->priv; + int step = inlink->sample_rate / (s->fps * s->count); + int fft_len = 1 << s->fft_bits; + int remaining; + float *audio_data; + + if (!insamples) { + while (s->remaining_fill < (fft_len >> 1)) { + int ret, x; + memset(&s->fft_data[fft_len - s->remaining_fill], 0, sizeof(*s->fft_data) * s->remaining_fill); + ret = plot_cqt(inlink); + if (ret < 0) + return ret; + for (x = 0; x < (fft_len-step); x++) + s->fft_data[x] = s->fft_data[x+step]; + s->remaining_fill += step; + } + return AVERROR(EOF); + } + + remaining = insamples->nb_samples; + audio_data = (float*) insamples->data[0]; + + while (remaining) { + if (remaining >= s->remaining_fill) { + int i = insamples->nb_samples - remaining; + int j = fft_len - s->remaining_fill; + int m, ret; + for (m = 0; m < s->remaining_fill; m++) { + s->fft_data[j+m].re = audio_data[2*(i+m)]; + s->fft_data[j+m].im = audio_data[2*(i+m)+1]; + } + ret = plot_cqt(inlink); + if (ret < 0) { + av_frame_free(&insamples); + return ret; + } + remaining -= s->remaining_fill; + for (m = 0; m < fft_len-step; m++) + s->fft_data[m] = s->fft_data[m+step]; + s->remaining_fill = step; + } else { + int i = insamples->nb_samples - remaining; + int j = fft_len - s->remaining_fill; + int m; + for (m = 0; m < remaining; m++) { + s->fft_data[m+j].re = audio_data[2*(i+m)]; + s->fft_data[m+j].im = audio_data[2*(i+m)+1]; + } + s->remaining_fill -= remaining; + remaining = 0; + } + } + av_frame_free(&insamples); + return 0; +} + +static int request_frame(AVFilterLink *outlink) +{ + ShowCQTContext *s = outlink->src->priv; + AVFilterLink *inlink = outlink->src->inputs[0]; + int ret; + + s->req_fullfilled = 0; + do { + ret = ff_request_frame(inlink); + } while (!s->req_fullfilled && ret >= 0); + + if (ret == AVERROR_EOF && s->outpicref) + filter_frame(inlink, NULL); + return ret; +} + +static const AVFilterPad showcqt_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad showcqt_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_output, + .request_frame = request_frame, + }, + { NULL } +}; + +AVFilter ff_avf_showcqt = { + .name = "showcqt", + .description = NULL_IF_CONFIG_SMALL("Convert input audio to a CQT (Constant Q Transform) spectrum video output."), + .uninit = uninit, + .query_formats = query_formats, + .priv_size = sizeof(ShowCQTContext), + .inputs = showcqt_inputs, + .outputs = showcqt_outputs, + .priv_class = &showcqt_class, +}; |
