FFmpeg: libavfilter/avf_showcqt.c Source File

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libavfilter

avf_showcqt.c

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1 /*

3 *

4 * This file is part of FFmpeg.

5 *

6 * FFmpeg is free software; you can redistribute it and/or

7 * modify it under the terms of the GNU Lesser General Public

8 * License as published by the Free Software Foundation; either

9 * version 2.1 of the License, or (at your option) any later version.

10 *

11 * FFmpeg is distributed in the hope that it will be useful,

12 * but WITHOUT ANY WARRANTY; without even the implied warranty of

13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

14 * Lesser General Public License for more details.

15 *

16 * You should have received a copy of the GNU Lesser General Public

17 * License along with FFmpeg; if not, write to the Free Software

18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

19 */

21 #include "config.h"

22 #include "libavcodec/avfft.h"

23 #include "libavutil/avassert.h"

24 #include "libavutil/channel_layout.h"

25 #include "libavutil/opt.h"

26 #include "libavutil/xga_font_data.h"

27 #include "libavutil/qsort.h"

28 #include "libavutil/time.h"

29 #include "libavutil/eval.h"

30 #include "avfilter.h"

31 #include "internal.h"

33 #include <math.h>

34 #include <stdlib.h>

36 #if CONFIG_LIBFREETYPE

37 #include <ft2build.h>

38 #include FT_FREETYPE_H

39 #endif

41 /* this filter is designed to do 16 bins/semitones constant Q transform with Brown-Puckette algorithm

42 * start from E0 to D#10 (10 octaves)

43 * so there are 16 bins/semitones * 12 semitones/octaves * 10 octaves = 1920 bins

44 * match with full HD resolution */

46 #define VIDEO_WIDTH 1920

47 #define VIDEO_HEIGHT 1080

48 #define FONT_HEIGHT 32

49 #define SPECTOGRAM_HEIGHT ((VIDEO_HEIGHT-FONT_HEIGHT)/2)

50 #define SPECTOGRAM_START (VIDEO_HEIGHT-SPECTOGRAM_HEIGHT)

51 #define BASE_FREQ 20.051392800492

52 #define COEFF_CLAMP 1.0e-4

53 #define TLENGTH_MIN 0.001

54 #define TLENGTH_DEFAULT "384/f*tc/(384/f+tc)"

55 #define VOLUME_MIN 1e-10

56 #define VOLUME_MAX 100.0

57 #define FONTCOLOR_DEFAULT "st(0, (midi(f)-59.5)/12);" \

58 "st(1, if(between(ld(0),0,1), 0.5-0.5*cos(2*PI*ld(0)), 0));" \

59 "r(1-ld(1)) + b(ld(1))"

61 typedef struct {

62 FFTSample value;

63 int index;

64 } SparseCoeff;

66 typedef struct {

67 const AVClass *class;

68 AVFrame *outpicref;

69 FFTContext *fft_context;

70 FFTComplex *fft_data;

71 FFTComplex *fft_result_left;

72 FFTComplex *fft_result_right;

73 uint8_t *spectogram;

74 SparseCoeff *coeff_sort;

75 SparseCoeff *coeffs[VIDEO_WIDTH];

76 uint8_t *font_alpha;

77 char *fontfile; /* using freetype */

78 int coeffs_len[VIDEO_WIDTH];

79 uint8_t fontcolor_value[VIDEO_WIDTH*3]; /* result of fontcolor option */

80 int64_t frame_count;

81 int spectogram_count;

82 int spectogram_index;

83 int fft_bits;

84 int req_fullfilled;

85 int remaining_fill;

86 char *tlength;

87 char *volume;

88 char *fontcolor;

89 double timeclamp; /* lower timeclamp, time-accurate, higher timeclamp, freq-accurate (at low freq)*/

90 float coeffclamp; /* lower coeffclamp, more precise, higher coeffclamp, faster */

91 int fullhd; /* if true, output video is at full HD resolution, otherwise it will be halved */

92 float gamma; /* lower gamma, more contrast, higher gamma, more range */

93 float gamma2; /* gamma of bargraph */

94 int fps; /* the required fps is so strict, so it's enough to be int, but 24000/1001 etc cannot be encoded */

95 int count; /* fps * count = transform rate */

96 } ShowCQTContext;

98 #define OFFSET(x) offsetof(ShowCQTContext, x)

99 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

100

101 static const AVOption showcqt_options[] = {

102 { "volume", "set volume", OFFSET(volume), AV_OPT_TYPE_STRING, { .str = "16" }, CHAR_MIN, CHAR_MAX, FLAGS },

103 { "tlength", "set transform length", OFFSET(tlength), AV_OPT_TYPE_STRING, { .str = TLENGTH_DEFAULT }, CHAR_MIN, CHAR_MAX, FLAGS },

104 { "timeclamp", "set timeclamp", OFFSET(timeclamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.17 }, 0.1, 1.0, FLAGS },

105 { "coeffclamp", "set coeffclamp", OFFSET(coeffclamp), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 0.1, 10, FLAGS },

106 { "gamma", "set gamma", OFFSET(gamma), AV_OPT_TYPE_FLOAT, { .dbl = 3 }, 1, 7, FLAGS },

107 { "gamma2", "set gamma of bargraph", OFFSET(gamma2), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 1, 7, FLAGS },

108 { "fullhd", "set full HD resolution", OFFSET(fullhd), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS },

109 { "fps", "set video fps", OFFSET(fps), AV_OPT_TYPE_INT, { .i64 = 25 }, 10, 100, FLAGS },

110 { "count", "set number of transform per frame", OFFSET(count), AV_OPT_TYPE_INT, { .i64 = 6 }, 1, 30, FLAGS },

111 { "fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, FLAGS },

112 { "fontcolor", "set font color", OFFSET(fontcolor), AV_OPT_TYPE_STRING, { .str = FONTCOLOR_DEFAULT }, CHAR_MIN, CHAR_MAX, FLAGS },

113 { NULL }

114 };

115

116 AVFILTER_DEFINE_CLASS(showcqt);

117

118 static av_cold void uninit(AVFilterContext *ctx)

119 {

120 int k;

121

122 ShowCQTContext *s = ctx->priv;

123 av_fft_end(s->fft_context);

124 s->fft_context = NULL;

125 for (k = 0; k < VIDEO_WIDTH; k++)

126 av_freep(&s->coeffs[k]);

127 av_freep(&s->fft_data);

128 av_freep(&s->fft_result_left);

129 av_freep(&s->fft_result_right);

130 av_freep(&s->coeff_sort);

131 av_freep(&s->spectogram);

132 av_freep(&s->font_alpha);

133 av_frame_free(&s->outpicref);

134 }

135

136 static int query_formats(AVFilterContext *ctx)

137 {

138 AVFilterFormats *formats = NULL;

139 AVFilterChannelLayouts *layouts = NULL;

140 AVFilterLink *inlink = ctx->inputs[0];

141 AVFilterLink *outlink = ctx->outputs[0];

142 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE };

143 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE };

144 static const int64_t channel_layouts[] = { AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_STEREO_DOWNMIX, -1 };

145 static const int samplerates[] = { 44100, 48000, -1 };

146

147 /* set input audio formats */

148 formats = ff_make_format_list(sample_fmts);

149 if (!formats)

150 return AVERROR(ENOMEM);

151 ff_formats_ref(formats, &inlink->out_formats);

152

153 layouts = avfilter_make_format64_list(channel_layouts);

154 if (!layouts)

155 return AVERROR(ENOMEM);

156 ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);

157

158 formats = ff_make_format_list(samplerates);

159 if (!formats)

160 return AVERROR(ENOMEM);

161 ff_formats_ref(formats, &inlink->out_samplerates);

162

163 /* set output video format */

164 formats = ff_make_format_list(pix_fmts);

165 if (!formats)

166 return AVERROR(ENOMEM);

167 ff_formats_ref(formats, &outlink->in_formats);

168

169 return 0;

170 }

171

172 #if CONFIG_LIBFREETYPE

173 static void load_freetype_font(AVFilterContext *ctx)

174 {

175 static const char str[] = "EF G A BC D ";

176 ShowCQTContext *s = ctx->priv;

177 FT_Library lib = NULL;

178 FT_Face face = NULL;

179 int video_scale = s->fullhd ? 2 : 1;

180 int video_width = (VIDEO_WIDTH/2) * video_scale;

181 int font_height = (FONT_HEIGHT/2) * video_scale;

182 int font_width = 8 * video_scale;

183 int font_repeat = font_width * 12;

184 int linear_hori_advance = font_width * 65536;

185 int non_monospace_warning = 0;

186 int x;

187

188 s->font_alpha = NULL;

189

190 if (!s->fontfile)

191 return;

192

193 if (FT_Init_FreeType(&lib))

194 goto fail;

195

196 if (FT_New_Face(lib, s->fontfile, 0, &face))

197 goto fail;

198

199 if (FT_Set_Char_Size(face, 16*64, 0, 0, 0))

200 goto fail;

201

202 if (FT_Load_Char(face, 'A', FT_LOAD_RENDER))

203 goto fail;

204

205 if (FT_Set_Char_Size(face, 16*64 * linear_hori_advance / face->glyph->linearHoriAdvance, 0, 0, 0))

206 goto fail;

207

208 s->font_alpha = av_malloc_array(font_height, video_width);

209 if (!s->font_alpha)

210 goto fail;

211

212 memset(s->font_alpha, 0, font_height * video_width);

213

214 for (x = 0; x < 12; x++) {

215 int sx, sy, rx, bx, by, dx, dy;

216

217 if (str[x] == ' ')

218 continue;

219

220 if (FT_Load_Char(face, str[x], FT_LOAD_RENDER))

221 goto fail;

222

223 if (face->glyph->advance.x != font_width*64 && !non_monospace_warning) {

224 av_log(ctx, AV_LOG_WARNING, "Font is not monospace\n");

225 non_monospace_warning = 1;

226 }

227

228 sy = font_height - 4*video_scale - face->glyph->bitmap_top;

229 for (rx = 0; rx < 10; rx++) {

230 sx = rx * font_repeat + x * font_width + face->glyph->bitmap_left;

231 for (by = 0; by < face->glyph->bitmap.rows; by++) {

232 dy = by + sy;

233 if (dy < 0)

234 continue;

235 if (dy >= font_height)

236 break;

237

238 for (bx = 0; bx < face->glyph->bitmap.width; bx++) {

239 dx = bx + sx;

240 if (dx < 0)

241 continue;

242 if (dx >= video_width)

243 break;

244 s->font_alpha[dy*video_width+dx] = face->glyph->bitmap.buffer[by*face->glyph->bitmap.width+bx];

245 }

246 }

247 }

248 }

249

250 FT_Done_Face(face);

251 FT_Done_FreeType(lib);

252 return;

253

254 fail:

255 av_log(ctx, AV_LOG_WARNING, "Error while loading freetype font, using default font instead\n");

256 FT_Done_Face(face);

257 FT_Done_FreeType(lib);

258 av_freep(&s->font_alpha);

259 return;

260 }

261 #endif

262

263 static double a_weighting(void *p, double f)

264 {

265 double ret = 12200.0*12200.0 * (f*f*f*f);

266 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0) *

267 sqrt((f*f + 107.7*107.7) * (f*f + 737.9*737.9));

268 return ret;

269 }

270

271 static double b_weighting(void *p, double f)

272 {

273 double ret = 12200.0*12200.0 * (f*f*f);

274 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0) * sqrt(f*f + 158.5*158.5);

275 return ret;

276 }

277

278 static double c_weighting(void *p, double f)

279 {

280 double ret = 12200.0*12200.0 * (f*f);

281 ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0);

282 return ret;

283 }

284

285 static double midi(void *p, double f)

286 {

287 return log2(f/440.0) * 12.0 + 69.0;

288 }

289

290 static double r_func(void *p, double x)

291 {

292 x = av_clipd(x, 0.0, 1.0);

293 return (int)(x*255.0+0.5) << 16;

294 }

295

296 static double g_func(void *p, double x)

297 {

298 x = av_clipd(x, 0.0, 1.0);

299 return (int)(x*255.0+0.5) << 8;

300 }

301

302 static double b_func(void *p, double x)

303 {

304 x = av_clipd(x, 0.0, 1.0);

305 return (int)(x*255.0+0.5);

306 }

307

308 static inline int qsort_sparsecoeff(const SparseCoeff *a, const SparseCoeff *b)

309 {

310 if (fabsf(a->value) >= fabsf(b->value))

311 return 1;

312 else

313 return -1;

314 }

315

316 static int config_output(AVFilterLink *outlink)

317 {

318 AVFilterContext *ctx = outlink->src;

319 AVFilterLink *inlink = ctx->inputs[0];

320 ShowCQTContext *s = ctx->priv;

321 AVExpr *tlength_expr = NULL, *volume_expr = NULL, *fontcolor_expr = NULL;

322 uint8_t *fontcolor_value = s->fontcolor_value;

323 static const char * const expr_vars[] = { "timeclamp", "tc", "frequency", "freq", "f", NULL };

324 static const char * const expr_func_names[] = { "a_weighting", "b_weighting", "c_weighting", NULL };

325 static const char * const expr_fontcolor_func_names[] = { "midi", "r", "g", "b", NULL };

326 static double (* const expr_funcs[])(void *, double) = { a_weighting, b_weighting, c_weighting, NULL };

327 static double (* const expr_fontcolor_funcs[])(void *, double) = { midi, r_func, g_func, b_func, NULL };

328 int fft_len, k, x, y, ret;

329 int num_coeffs = 0;

330 int rate = inlink->sample_rate;

331 double max_len = rate * (double) s->timeclamp;

332 int64_t start_time, end_time;

333 int video_scale = s->fullhd ? 2 : 1;

334 int video_width = (VIDEO_WIDTH/2) * video_scale;

335 int video_height = (VIDEO_HEIGHT/2) * video_scale;

336 int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale;

337

338 s->fft_bits = ceil(log2(max_len));

339 fft_len = 1 << s->fft_bits;

340

341 if (rate % (s->fps * s->count)) {

342 av_log(ctx, AV_LOG_ERROR, "Rate (%u) is not divisible by fps*count (%u*%u)\n", rate, s->fps, s->count);

343 return AVERROR(EINVAL);

344 }

345

346 s->fft_data = av_malloc_array(fft_len, sizeof(*s->fft_data));

347 s->coeff_sort = av_malloc_array(fft_len, sizeof(*s->coeff_sort));

348 s->fft_result_left = av_malloc_array(fft_len, sizeof(*s->fft_result_left));

349 s->fft_result_right = av_malloc_array(fft_len, sizeof(*s->fft_result_right));

350 s->fft_context = av_fft_init(s->fft_bits, 0);

351

352 if (!s->fft_data || !s->coeff_sort || !s->fft_result_left || !s->fft_result_right || !s->fft_context)

353 return AVERROR(ENOMEM);

354

355 #if CONFIG_LIBFREETYPE

356 load_freetype_font(ctx);

357 #else

358 if (s->fontfile)

359 av_log(ctx, AV_LOG_WARNING, "Freetype is not available, ignoring fontfile option\n");

360 s->font_alpha = NULL;

361 #endif

362

363 av_log(ctx, AV_LOG_INFO, "Calculating spectral kernel, please wait\n");

364 start_time = av_gettime_relative();

365 ret = av_expr_parse(&tlength_expr, s->tlength, expr_vars, NULL, NULL, NULL, NULL, 0, ctx);

366 if (ret < 0)

367 goto eval_error;

368

369 ret = av_expr_parse(&volume_expr, s->volume, expr_vars, expr_func_names,

370 expr_funcs, NULL, NULL, 0, ctx);

371 if (ret < 0)

372 goto eval_error;

373

374 ret = av_expr_parse(&fontcolor_expr, s->fontcolor, expr_vars, expr_fontcolor_func_names,

375 expr_fontcolor_funcs, NULL, NULL, 0, ctx);

376 if (ret < 0)

377 goto eval_error;

378

379 for (k = 0; k < VIDEO_WIDTH; k++) {

380 int hlen = fft_len >> 1;

381 float total = 0;

382 float partial = 0;

383 double freq = BASE_FREQ * exp2(k * (1.0/192.0));

384 double tlen, tlength, volume;

385 double expr_vars_val[] = { s->timeclamp, s->timeclamp, freq, freq, freq, 0 };

386 /* a window function from Albert H. Nuttall,

387 * "Some Windows with Very Good Sidelobe Behavior"

388 * -93.32 dB peak sidelobe and 18 dB/octave asymptotic decay

389 * coefficient normalized to a0 = 1 */

390 double a0 = 0.355768;

391 double a1 = 0.487396/a0;

392 double a2 = 0.144232/a0;

393 double a3 = 0.012604/a0;

394 double sv_step, cv_step, sv, cv;

395 double sw_step, cw_step, sw, cw, w;

396

397 tlength = av_expr_eval(tlength_expr, expr_vars_val, NULL);

398 if (isnan(tlength)) {

399 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is nan, setting it to %g\n", freq, s->timeclamp);

400 tlength = s->timeclamp;

401 } else if (tlength < TLENGTH_MIN) {

402 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is %g, setting it to %g\n", freq, tlength, TLENGTH_MIN);

403 tlength = TLENGTH_MIN;

404 } else if (tlength > s->timeclamp) {

405 av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is %g, setting it to %g\n", freq, tlength, s->timeclamp);

406 tlength = s->timeclamp;

407 }

408

409 volume = FFABS(av_expr_eval(volume_expr, expr_vars_val, NULL));

410 if (isnan(volume)) {

411 av_log(ctx, AV_LOG_WARNING, "at freq %g: volume is nan, setting it to 0\n", freq);

412 volume = VOLUME_MIN;

413 } else if (volume < VOLUME_MIN) {

414 volume = VOLUME_MIN;

415 } else if (volume > VOLUME_MAX) {

416 av_log(ctx, AV_LOG_WARNING, "at freq %g: volume is %g, setting it to %g\n", freq, volume, VOLUME_MAX);

417 volume = VOLUME_MAX;

418 }

419

420 if (s->fullhd || !(k & 1)) {

421 int fontcolor = av_expr_eval(fontcolor_expr, expr_vars_val, NULL);

422 fontcolor_value[0] = (fontcolor >> 16) & 0xFF;

423 fontcolor_value[1] = (fontcolor >> 8) & 0xFF;

424 fontcolor_value[2] = fontcolor & 0xFF;

425 fontcolor_value += 3;

426 }

427

428 tlen = tlength * rate;

429 s->fft_data[0].re = 0;

430 s->fft_data[0].im = 0;

431 s->fft_data[hlen].re = (1.0 + a1 + a2 + a3) * (1.0/tlen) * volume * (1.0/fft_len);

432 s->fft_data[hlen].im = 0;

433 sv_step = sv = sin(2.0*M_PI*freq*(1.0/rate));

434 cv_step = cv = cos(2.0*M_PI*freq*(1.0/rate));

435 /* also optimizing window func */

436 sw_step = sw = sin(2.0*M_PI*(1.0/tlen));

437 cw_step = cw = cos(2.0*M_PI*(1.0/tlen));

438 for (x = 1; x < 0.5 * tlen; x++) {

439 double cv_tmp, cw_tmp;

440 double cw2, cw3, sw2;

441

442 cw2 = cw * cw - sw * sw;

443 sw2 = cw * sw + sw * cw;

444 cw3 = cw * cw2 - sw * sw2;

445 w = (1.0 + a1 * cw + a2 * cw2 + a3 * cw3) * (1.0/tlen) * volume * (1.0/fft_len);

446 s->fft_data[hlen + x].re = w * cv;

447 s->fft_data[hlen + x].im = w * sv;

448 s->fft_data[hlen - x].re = s->fft_data[hlen + x].re;

449 s->fft_data[hlen - x].im = -s->fft_data[hlen + x].im;

450

451 cv_tmp = cv * cv_step - sv * sv_step;

452 sv = sv * cv_step + cv * sv_step;

453 cv = cv_tmp;

454 cw_tmp = cw * cw_step - sw * sw_step;

455 sw = sw * cw_step + cw * sw_step;

456 cw = cw_tmp;

457 }

458 for (; x < hlen; x++) {

459 s->fft_data[hlen + x].re = 0;

460 s->fft_data[hlen + x].im = 0;

461 s->fft_data[hlen - x].re = 0;

462 s->fft_data[hlen - x].im = 0;

463 }

464 av_fft_permute(s->fft_context, s->fft_data);

465 av_fft_calc(s->fft_context, s->fft_data);

466

467 for (x = 0; x < fft_len; x++) {

468 s->coeff_sort[x].index = x;

469 s->coeff_sort[x].value = s->fft_data[x].re;

470 }

471

472 AV_QSORT(s->coeff_sort, fft_len, SparseCoeff, qsort_sparsecoeff);

473 for (x = 0; x < fft_len; x++)

474 total += fabsf(s->coeff_sort[x].value);

475

476 for (x = 0; x < fft_len; x++) {

477 partial += fabsf(s->coeff_sort[x].value);

478 if (partial > total * s->coeffclamp * COEFF_CLAMP) {

479 s->coeffs_len[k] = fft_len - x;

480 num_coeffs += s->coeffs_len[k];

481 s->coeffs[k] = av_malloc_array(s->coeffs_len[k], sizeof(*s->coeffs[k]));

482 if (!s->coeffs[k]) {

483 ret = AVERROR(ENOMEM);

484 goto eval_error;

485 }

486 for (y = 0; y < s->coeffs_len[k]; y++)

487 s->coeffs[k][y] = s->coeff_sort[x+y];

488 break;

489 }

490 }

491 }

492 av_expr_free(fontcolor_expr);

493 av_expr_free(volume_expr);

494 av_expr_free(tlength_expr);

495 end_time = av_gettime_relative();

496 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);

497

498 outlink->w = video_width;

499 outlink->h = video_height;

500

501 s->req_fullfilled = 0;

502 s->spectogram_index = 0;

503 s->frame_count = 0;

504 s->spectogram_count = 0;

505 s->remaining_fill = fft_len >> 1;

506 memset(s->fft_data, 0, fft_len * sizeof(*s->fft_data));

507

508 s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);

509 if (!s->outpicref)

510 return AVERROR(ENOMEM);

511

512 s->spectogram = av_calloc(spectogram_height, s->outpicref->linesize[0]);

513 if (!s->spectogram)

514 return AVERROR(ENOMEM);

515

516 outlink->sample_aspect_ratio = av_make_q(1, 1);

517 outlink->time_base = av_make_q(1, s->fps);

518 outlink->frame_rate = av_make_q(s->fps, 1);

519 return 0;

520

521 eval_error:

522 av_expr_free(fontcolor_expr);

523 av_expr_free(volume_expr);

524 av_expr_free(tlength_expr);

525 return ret;

526 }

527

528 static int plot_cqt(AVFilterLink *inlink)

529 {

530 AVFilterContext *ctx = inlink->dst;

531 ShowCQTContext *s = ctx->priv;

532 AVFilterLink *outlink = ctx->outputs[0];

533 int fft_len = 1 << s->fft_bits;

534 FFTSample result[VIDEO_WIDTH][4];

535 int x, y, ret = 0;

536 int linesize = s->outpicref->linesize[0];

537 int video_scale = s->fullhd ? 2 : 1;

538 int video_width = (VIDEO_WIDTH/2) * video_scale;

539 int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale;

540 int spectogram_start = (SPECTOGRAM_START/2) * video_scale;

541 int font_height = (FONT_HEIGHT/2) * video_scale;

542

543 /* real part contains left samples, imaginary part contains right samples */

544 memcpy(s->fft_result_left, s->fft_data, fft_len * sizeof(*s->fft_data));

545 av_fft_permute(s->fft_context, s->fft_result_left);

546 av_fft_calc(s->fft_context, s->fft_result_left);

547

548 /* separate left and right, (and multiply by 2.0) */

549 s->fft_result_right[0].re = 2.0f * s->fft_result_left[0].im;

550 s->fft_result_right[0].im = 0;

551 s->fft_result_left[0].re = 2.0f * s->fft_result_left[0].re;

552 s->fft_result_left[0].im = 0;

553 for (x = 1; x <= fft_len >> 1; x++) {

554 FFTSample tmpy = s->fft_result_left[fft_len-x].im - s->fft_result_left[x].im;

555

556 s->fft_result_right[x].re = s->fft_result_left[x].im + s->fft_result_left[fft_len-x].im;

557 s->fft_result_right[x].im = s->fft_result_left[x].re - s->fft_result_left[fft_len-x].re;

558 s->fft_result_right[fft_len-x].re = s->fft_result_right[x].re;

559 s->fft_result_right[fft_len-x].im = -s->fft_result_right[x].im;

560

561 s->fft_result_left[x].re = s->fft_result_left[x].re + s->fft_result_left[fft_len-x].re;

562 s->fft_result_left[x].im = tmpy;

563 s->fft_result_left[fft_len-x].re = s->fft_result_left[x].re;

564 s->fft_result_left[fft_len-x].im = -s->fft_result_left[x].im;

565 }

566

567 /* calculating cqt */

568 for (x = 0; x < VIDEO_WIDTH; x++) {

569 int u;

570 float g = 1.0f / s->gamma;

571 float g2 = 1.0f / s->gamma2;

572 FFTComplex l = {0,0};

573 FFTComplex r = {0,0};

574

575 for (u = 0; u < s->coeffs_len[x]; u++) {

576 FFTSample value = s->coeffs[x][u].value;

577 int index = s->coeffs[x][u].index;

578 l.re += value * s->fft_result_left[index].re;

579 l.im += value * s->fft_result_left[index].im;

580 r.re += value * s->fft_result_right[index].re;

581 r.im += value * s->fft_result_right[index].im;

582 }

583 /* result is power, not amplitude */

584 result[x][0] = l.re * l.re + l.im * l.im;

585 result[x][2] = r.re * r.re + r.im * r.im;

586 result[x][1] = 0.5f * (result[x][0] + result[x][2]);

587 result[x][3] = (g2 == 1.0f) ? result[x][1] : powf(result[x][1], g2);

588 result[x][0] = 255.0f * powf(FFMIN(1.0f,result[x][0]), g);

589 result[x][1] = 255.0f * powf(FFMIN(1.0f,result[x][1]), g);

590 result[x][2] = 255.0f * powf(FFMIN(1.0f,result[x][2]), g);

591 }

592

593 if (!s->fullhd) {

594 for (x = 0; x < video_width; x++) {

595 result[x][0] = 0.5f * (result[2*x][0] + result[2*x+1][0]);

596 result[x][1] = 0.5f * (result[2*x][1] + result[2*x+1][1]);

597 result[x][2] = 0.5f * (result[2*x][2] + result[2*x+1][2]);

598 result[x][3] = 0.5f * (result[2*x][3] + result[2*x+1][3]);

599 }

600 }

601

602 for (x = 0; x < video_width; x++) {

603 s->spectogram[s->spectogram_index*linesize + 3*x] = result[x][0] + 0.5f;

604 s->spectogram[s->spectogram_index*linesize + 3*x + 1] = result[x][1] + 0.5f;

605 s->spectogram[s->spectogram_index*linesize + 3*x + 2] = result[x][2] + 0.5f;

606 }

607

608 /* drawing */

609 if (!s->spectogram_count) {

610 uint8_t *data = (uint8_t*) s->outpicref->data[0];

611 float rcp_result[VIDEO_WIDTH];

612 int total_length = linesize * spectogram_height;

613 int back_length = linesize * s->spectogram_index;

614

615 for (x = 0; x < video_width; x++)

616 rcp_result[x] = 1.0f / (result[x][3]+0.0001f);

617

618 /* drawing bar */

619 for (y = 0; y < spectogram_height; y++) {

620 float height = (spectogram_height - y) * (1.0f/spectogram_height);

621 uint8_t *lineptr = data + y * linesize;

622 for (x = 0; x < video_width; x++) {

623 float mul;

624 if (result[x][3] <= height) {

625 *lineptr++ = 0;

626 *lineptr++ = 0;

627 *lineptr++ = 0;

628 } else {

629 mul = (result[x][3] - height) * rcp_result[x];

630 *lineptr++ = mul * result[x][0] + 0.5f;

631 *lineptr++ = mul * result[x][1] + 0.5f;

632 *lineptr++ = mul * result[x][2] + 0.5f;

633 }

634 }

635 }

636

637 /* drawing font */

638 if (s->font_alpha) {

639 for (y = 0; y < font_height; y++) {

640 uint8_t *lineptr = data + (spectogram_height + y) * linesize;

641 uint8_t *spectogram_src = s->spectogram + s->spectogram_index * linesize;

642 uint8_t *fontcolor_value = s->fontcolor_value;

643 for (x = 0; x < video_width; x++) {

644 uint8_t alpha = s->font_alpha[y*video_width+x];

645 lineptr[3*x] = (spectogram_src[3*x] * (255-alpha) + fontcolor_value[0] * alpha + 255) >> 8;

646 lineptr[3*x+1] = (spectogram_src[3*x+1] * (255-alpha) + fontcolor_value[1] * alpha + 255) >> 8;

647 lineptr[3*x+2] = (spectogram_src[3*x+2] * (255-alpha) + fontcolor_value[2] * alpha + 255) >> 8;

648 fontcolor_value += 3;

649 }

650 }

651 } else {

652 for (y = 0; y < font_height; y++) {

653 uint8_t *lineptr = data + (spectogram_height + y) * linesize;

654 memcpy(lineptr, s->spectogram + s->spectogram_index * linesize, video_width*3);

655 }

656 for (x = 0; x < video_width; x += video_width/10) {

657 int u;

658 static const char str[] = "EF G A BC D ";

659 uint8_t *startptr = data + spectogram_height * linesize + x * 3;

660 for (u = 0; str[u]; u++) {

661 int v;

662 for (v = 0; v < 16; v++) {

663 uint8_t *p = startptr + v * linesize * video_scale + 8 * 3 * u * video_scale;

664 int ux = x + 8 * u * video_scale;

665 int mask;

666 for (mask = 0x80; mask; mask >>= 1) {

667 if (mask & avpriv_vga16_font[str[u] * 16 + v]) {

668 p[0] = s->fontcolor_value[3*ux];

669 p[1] = s->fontcolor_value[3*ux+1];

670 p[2] = s->fontcolor_value[3*ux+2];

671 if (video_scale == 2) {

672 p[linesize] = p[0];

673 p[linesize+1] = p[1];

674 p[linesize+2] = p[2];

675 p[3] = p[linesize+3] = s->fontcolor_value[3*ux+3];

676 p[4] = p[linesize+4] = s->fontcolor_value[3*ux+4];

677 p[5] = p[linesize+5] = s->fontcolor_value[3*ux+5];

678 }

679 }

680 p += 3 * video_scale;

681 ux += video_scale;

682 }

683 }

684 }

685 }

686 }

687

688 /* drawing spectogram/sonogram */

689 data += spectogram_start * linesize;

690 memcpy(data, s->spectogram + s->spectogram_index*linesize, total_length - back_length);

691

692 data += total_length - back_length;

693 if (back_length)

694 memcpy(data, s->spectogram, back_length);

695

696 s->outpicref->pts = s->frame_count;

697 ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref));

698 s->req_fullfilled = 1;

699 s->frame_count++;

700 }

701 s->spectogram_count = (s->spectogram_count + 1) % s->count;

702 s->spectogram_index = (s->spectogram_index + spectogram_height - 1) % spectogram_height;

703 return ret;

704 }

705

706 static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)

707 {

708 AVFilterContext *ctx = inlink->dst;

709 ShowCQTContext *s = ctx->priv;

710 int step = inlink->sample_rate / (s->fps * s->count);

711 int fft_len = 1 << s->fft_bits;

712 int remaining;

713 float *audio_data;

714

715 if (!insamples) {

716 while (s->remaining_fill < (fft_len >> 1)) {

717 int ret, x;

718 memset(&s->fft_data[fft_len - s->remaining_fill], 0, sizeof(*s->fft_data) * s->remaining_fill);

719 ret = plot_cqt(inlink);

720 if (ret < 0)

721 return ret;

722 for (x = 0; x < (fft_len-step); x++)

723 s->fft_data[x] = s->fft_data[x+step];

724 s->remaining_fill += step;

725 }

726 return AVERROR(EOF);

727 }

728

729 remaining = insamples->nb_samples;

730 audio_data = (float*) insamples->data[0];

731

732 while (remaining) {

733 if (remaining >= s->remaining_fill) {

734 int i = insamples->nb_samples - remaining;

735 int j = fft_len - s->remaining_fill;

736 int m, ret;

737 for (m = 0; m < s->remaining_fill; m++) {

738 s->fft_data[j+m].re = audio_data[2*(i+m)];

739 s->fft_data[j+m].im = audio_data[2*(i+m)+1];

740 }

741 ret = plot_cqt(inlink);

742 if (ret < 0) {

743 av_frame_free(&insamples);

744 return ret;

745 }

746 remaining -= s->remaining_fill;

747 for (m = 0; m < fft_len-step; m++)

748 s->fft_data[m] = s->fft_data[m+step];

749 s->remaining_fill = step;

750 } else {

751 int i = insamples->nb_samples - remaining;

752 int j = fft_len - s->remaining_fill;

753 int m;

754 for (m = 0; m < remaining; m++) {

755 s->fft_data[m+j].re = audio_data[2*(i+m)];

756 s->fft_data[m+j].im = audio_data[2*(i+m)+1];

757 }

758 s->remaining_fill -= remaining;

759 remaining = 0;

760 }

761 }

762 av_frame_free(&insamples);

763 return 0;

764 }

765

766 static int request_frame(AVFilterLink *outlink)

767 {

768 ShowCQTContext *s = outlink->src->priv;

769 AVFilterLink *inlink = outlink->src->inputs[0];

770 int ret;

771

772 s->req_fullfilled = 0;

773 do {

774 ret = ff_request_frame(inlink);

775 } while (!s->req_fullfilled && ret >= 0);

776

777 if (ret == AVERROR_EOF && s->outpicref)

778 filter_frame(inlink, NULL);

779 return ret;

780 }

781

782 static const AVFilterPad showcqt_inputs[] = {

783 {

784 .name = "default",

785 .type = AVMEDIA_TYPE_AUDIO,

786 .filter_frame = filter_frame,

787 },

788 { NULL }

789 };

790

791 static const AVFilterPad showcqt_outputs[] = {

792 {

793 .name = "default",

794 .type = AVMEDIA_TYPE_VIDEO,

795 .config_props = config_output,

796 .request_frame = request_frame,

797 },

798 { NULL }

799 };

800

801 AVFilter ff_avf_showcqt = {

802 .name = "showcqt",

803 .description = NULL_IF_CONFIG_SMALL("Convert input audio to a CQT (Constant Q Transform) spectrum video output."),

804 .uninit = uninit,

805 .query_formats = query_formats,

806 .priv_size = sizeof(ShowCQTContext),

807 .inputs = showcqt_inputs,

808 .outputs = showcqt_outputs,

809 .priv_class = &showcqt_class,

810 };

Generated on Sun Mar 8 2015 02:35:05 for FFmpeg by doxygen 1.8.2