2 Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic 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
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
22 /** @file src/image.cc
23 * @brief A class to describe a video image.
27 #include "compose.hpp"
28 #include "dcpomatic_assert.h"
29 #include "dcpomatic_socket.h"
30 #include "enum_indexed_vector.h"
31 #include "exceptions.h"
33 #include "maths_util.h"
34 #include "memory_util.h"
37 #include <dcp/rgb_xyz.h>
38 #include <dcp/transfer_function.h>
39 #include <dcp/warnings.h>
40 LIBDCP_DISABLE_WARNINGS
42 #include <libavutil/frame.h>
43 #include <libavutil/pixdesc.h>
44 #include <libavutil/pixfmt.h>
45 #include <libswscale/swscale.h>
47 LIBDCP_ENABLE_WARNINGS
48 #if HAVE_VALGRIND_MEMCHECK_H
49 #include <valgrind/memcheck.h>
60 using std::make_shared;
63 using std::runtime_error;
64 using std::shared_ptr;
69 /** The memory alignment, in bytes, used for each row of an image if Alignment::PADDED is requested */
70 int constexpr ALIGNMENT = 64;
72 /* U/V black value for 8-bit colour */
73 static uint8_t const eight_bit_uv = (1 << 7) - 1;
74 /* U/V black value for 9-bit colour */
75 static uint16_t const nine_bit_uv = (1 << 8) - 1;
76 /* U/V black value for 10-bit colour */
77 static uint16_t const ten_bit_uv = (1 << 9) - 1;
78 /* U/V black value for 16-bit colour */
79 static uint16_t const sixteen_bit_uv = (1 << 15) - 1;
83 Image::vertical_factor (int n) const
89 auto d = av_pix_fmt_desc_get(_pixel_format);
91 throw PixelFormatError ("line_factor()", _pixel_format);
94 return lrintf(powf(2.0f, d->log2_chroma_h));
98 Image::horizontal_factor (int n) const
104 auto d = av_pix_fmt_desc_get(_pixel_format);
106 throw PixelFormatError ("sample_size()", _pixel_format);
109 return lrintf(powf(2.0f, d->log2_chroma_w));
113 /** @param n Component index.
114 * @return Number of samples (i.e. pixels, unless sub-sampled) in each direction for this component.
117 Image::sample_size (int n) const
120 lrint (ceil(static_cast<double>(size().width) / horizontal_factor(n))),
121 lrint (ceil(static_cast<double>(size().height) / vertical_factor(n)))
126 /** @return Number of planes */
128 Image::planes () const
130 if (_pixel_format == AV_PIX_FMT_PAL8) {
134 auto d = av_pix_fmt_desc_get(_pixel_format);
136 throw PixelFormatError ("planes()", _pixel_format);
139 if ((d->flags & AV_PIX_FMT_FLAG_PLANAR) == 0) {
143 return d->nb_components;
149 round_width_for_subsampling (int p, AVPixFmtDescriptor const * desc)
151 return p & ~ ((1 << desc->log2_chroma_w) - 1);
157 round_height_for_subsampling (int p, AVPixFmtDescriptor const * desc)
159 return p & ~ ((1 << desc->log2_chroma_h) - 1);
163 /** Crop this image, scale it to `inter_size' and then place it in a black frame of `out_size'.
164 * @param crop Amount to crop by.
165 * @param inter_size Size to scale the cropped image to.
166 * @param out_size Size of output frame; if this is larger than inter_size there will be black padding.
167 * @param yuv_to_rgb YUV to RGB transformation to use, if required.
168 * @param video_range Video range of the image.
169 * @param out_format Output pixel format.
170 * @param out_aligned true to make the output image aligned.
171 * @param out_video_range Video range to use for the output image.
172 * @param fast Try to be fast at the possible expense of quality; at present this means using
173 * fast bilinear rather than bicubic scaling.
176 Image::crop_scale_window (
178 dcp::Size inter_size,
180 dcp::YUVToRGB yuv_to_rgb,
181 VideoRange video_range,
182 AVPixelFormat out_format,
183 VideoRange out_video_range,
184 Alignment out_alignment,
188 /* Empirical testing suggests that sws_scale() will crash if
189 the input image is not padded.
191 DCPOMATIC_ASSERT (alignment() == Alignment::PADDED);
193 DCPOMATIC_ASSERT (out_size.width >= inter_size.width);
194 DCPOMATIC_ASSERT (out_size.height >= inter_size.height);
196 auto out = make_shared<Image>(out_format, out_size, out_alignment);
199 auto in_desc = av_pix_fmt_desc_get (_pixel_format);
201 throw PixelFormatError ("crop_scale_window()", _pixel_format);
204 /* Round down so that we crop only the number of pixels that is straightforward
205 * considering any subsampling.
208 round_width_for_subsampling(crop.left, in_desc),
209 round_width_for_subsampling(crop.right, in_desc),
210 round_height_for_subsampling(crop.top, in_desc),
211 round_height_for_subsampling(crop.bottom, in_desc)
214 /* Also check that we aren't cropping more image than there actually is */
215 if ((corrected_crop.left + corrected_crop.right) >= (size().width - 4)) {
216 corrected_crop.left = 0;
217 corrected_crop.right = size().width - 4;
220 if ((corrected_crop.top + corrected_crop.bottom) >= (size().height - 4)) {
221 corrected_crop.top = 0;
222 corrected_crop.bottom = size().height - 4;
225 /* Size of the image after any crop */
226 auto const cropped_size = corrected_crop.apply (size());
228 /* Scale context for a scale from cropped_size to inter_size */
229 auto scale_context = sws_getContext (
230 cropped_size.width, cropped_size.height, pixel_format(),
231 inter_size.width, inter_size.height, out_format,
232 fast ? SWS_FAST_BILINEAR : SWS_BICUBIC, 0, 0, 0
235 if (!scale_context) {
236 throw runtime_error (N_("Could not allocate SwsContext"));
239 DCPOMATIC_ASSERT (yuv_to_rgb < dcp::YUVToRGB::COUNT);
240 EnumIndexedVector<int, dcp::YUVToRGB> lut;
241 lut[dcp::YUVToRGB::REC601] = SWS_CS_ITU601;
242 lut[dcp::YUVToRGB::REC709] = SWS_CS_ITU709;
243 lut[dcp::YUVToRGB::REC2020] = SWS_CS_BT2020;
245 /* The 3rd parameter here is:
246 0 -> source range MPEG (i.e. "video", 16-235)
247 1 -> source range JPEG (i.e. "full", 0-255)
249 0 -> destination range MPEG (i.e. "video", 16-235)
250 1 -> destination range JPEG (i.e. "full", 0-255)
252 But remember: sws_setColorspaceDetails ignores these
253 parameters unless the both source and destination images
254 are isYUV or isGray. (If either is not, it uses video range).
256 sws_setColorspaceDetails (
258 sws_getCoefficients(lut[yuv_to_rgb]), video_range == VideoRange::VIDEO ? 0 : 1,
259 sws_getCoefficients(lut[yuv_to_rgb]), out_video_range == VideoRange::VIDEO ? 0 : 1,
263 /* Prepare input data pointers with crop */
264 uint8_t* scale_in_data[planes()];
265 for (int c = 0; c < planes(); ++c) {
266 int const x = lrintf(bytes_per_pixel(c) * corrected_crop.left);
267 scale_in_data[c] = data()[c] + x + stride()[c] * (corrected_crop.top / vertical_factor(c));
270 auto out_desc = av_pix_fmt_desc_get (out_format);
272 throw PixelFormatError ("crop_scale_window()", out_format);
275 /* Corner of the image within out_size */
276 Position<int> const corner (
277 round_width_for_subsampling((out_size.width - inter_size.width) / 2, out_desc),
278 round_height_for_subsampling((out_size.height - inter_size.height) / 2, out_desc)
281 uint8_t* scale_out_data[out->planes()];
282 for (int c = 0; c < out->planes(); ++c) {
283 int const x = lrintf(out->bytes_per_pixel(c) * corner.x);
284 scale_out_data[c] = out->data()[c] + x + out->stride()[c] * (corner.y / out->vertical_factor(c));
289 scale_in_data, stride(),
290 0, cropped_size.height,
291 scale_out_data, out->stride()
294 sws_freeContext (scale_context);
296 /* There are some cases where there will be unwanted image data left in the image at this point:
298 * 1. When we are cropping without any scaling or pixel format conversion.
299 * 2. When we are scaling to certain sizes and placing the result into a larger
302 * Clear out the sides of the image to take care of those cases.
304 auto const pad = (out_size.width - inter_size.width) / 2;
305 out->make_part_black(0, pad);
306 out->make_part_black(corner.x + inter_size.width, pad);
309 video_range == VideoRange::VIDEO &&
310 out_video_range == VideoRange::FULL &&
311 av_pix_fmt_desc_get(_pixel_format)->flags & AV_PIX_FMT_FLAG_RGB
313 /* libswscale will not convert video range for RGB sources, so we have to do it ourselves */
314 out->video_range_to_full_range ();
322 Image::convert_pixel_format (dcp::YUVToRGB yuv_to_rgb, AVPixelFormat out_format, Alignment out_alignment, bool fast) const
324 return scale(size(), yuv_to_rgb, out_format, out_alignment, fast);
328 /** @param out_size Size to scale to.
329 * @param yuv_to_rgb YUVToRGB transform transform to use, if required.
330 * @param out_format Output pixel format.
331 * @param out_alignment Output alignment.
332 * @param fast Try to be fast at the possible expense of quality; at present this means using
333 * fast bilinear rather than bicubic scaling.
336 Image::scale (dcp::Size out_size, dcp::YUVToRGB yuv_to_rgb, AVPixelFormat out_format, Alignment out_alignment, bool fast) const
338 /* Empirical testing suggests that sws_scale() will crash if
339 the input image alignment is not PADDED.
341 DCPOMATIC_ASSERT (alignment() == Alignment::PADDED);
343 auto scaled = make_shared<Image>(out_format, out_size, out_alignment);
344 auto scale_context = sws_getContext (
345 size().width, size().height, pixel_format(),
346 out_size.width, out_size.height, out_format,
347 (fast ? SWS_FAST_BILINEAR : SWS_BICUBIC) | SWS_ACCURATE_RND, 0, 0, 0
350 DCPOMATIC_ASSERT (yuv_to_rgb < dcp::YUVToRGB::COUNT);
351 EnumIndexedVector<int, dcp::YUVToRGB> lut;
352 lut[dcp::YUVToRGB::REC601] = SWS_CS_ITU601;
353 lut[dcp::YUVToRGB::REC709] = SWS_CS_ITU709;
354 lut[dcp::YUVToRGB::REC2020] = SWS_CS_BT2020;
356 /* The 3rd parameter here is:
357 0 -> source range MPEG (i.e. "video", 16-235)
358 1 -> source range JPEG (i.e. "full", 0-255)
360 0 -> destination range MPEG (i.e. "video", 16-235)
361 1 -> destination range JPEG (i.e. "full", 0-255)
363 But remember: sws_setColorspaceDetails ignores these
364 parameters unless the corresponding image isYUV or isGray.
365 (If it's neither, it uses video range).
367 sws_setColorspaceDetails (
369 sws_getCoefficients(lut[yuv_to_rgb]), 0,
370 sws_getCoefficients(lut[yuv_to_rgb]), 0,
378 scaled->data(), scaled->stride()
381 sws_freeContext (scale_context);
387 /** Blacken a YUV image whose bits per pixel is rounded up to 16 */
389 Image::yuv_16_black (uint16_t v, bool alpha)
391 memset (data()[0], 0, sample_size(0).height * stride()[0]);
392 for (int i = 1; i < 3; ++i) {
393 auto p = reinterpret_cast<int16_t*> (data()[i]);
394 int const lines = sample_size(i).height;
395 for (int y = 0; y < lines; ++y) {
396 /* We divide by 2 here because we are writing 2 bytes at a time */
397 for (int x = 0; x < line_size()[i] / 2; ++x) {
400 p += stride()[i] / 2;
405 memset (data()[3], 0, sample_size(3).height * stride()[3]);
411 Image::swap_16 (uint16_t v)
413 return ((v >> 8) & 0xff) | ((v & 0xff) << 8);
418 Image::make_part_black (int const start, int const width)
420 auto y_part = [&]() {
421 int const bpp = bytes_per_pixel(0);
422 int const h = sample_size(0).height;
423 int const s = stride()[0];
425 for (int y = 0; y < h; ++y) {
426 memset (p + start * bpp, 0, width * bpp);
431 switch (_pixel_format) {
432 case AV_PIX_FMT_RGB24:
433 case AV_PIX_FMT_ARGB:
434 case AV_PIX_FMT_RGBA:
435 case AV_PIX_FMT_ABGR:
436 case AV_PIX_FMT_BGRA:
437 case AV_PIX_FMT_RGB555LE:
438 case AV_PIX_FMT_RGB48LE:
439 case AV_PIX_FMT_RGB48BE:
440 case AV_PIX_FMT_XYZ12LE:
442 int const h = sample_size(0).height;
443 int const bpp = bytes_per_pixel(0);
444 int const s = stride()[0];
445 uint8_t* p = data()[0];
446 for (int y = 0; y < h; y++) {
447 memset (p + start * bpp, 0, width * bpp);
452 case AV_PIX_FMT_YUV420P:
455 for (int i = 1; i < 3; ++i) {
457 int const h = sample_size(i).height;
458 for (int y = 0; y < h; ++y) {
459 for (int x = start / 2; x < (start + width) / 2; ++x) {
467 case AV_PIX_FMT_YUV422P10LE:
470 for (int i = 1; i < 3; ++i) {
471 auto p = reinterpret_cast<int16_t*>(data()[i]);
472 int const h = sample_size(i).height;
473 for (int y = 0; y < h; ++y) {
474 for (int x = start / 2; x < (start + width) / 2; ++x) {
477 p += stride()[i] / 2;
482 case AV_PIX_FMT_YUV444P10LE:
485 for (int i = 1; i < 3; ++i) {
486 auto p = reinterpret_cast<int16_t*>(data()[i]);
487 int const h = sample_size(i).height;
488 for (int y = 0; y < h; ++y) {
489 for (int x = start; x < (start + width); ++x) {
492 p += stride()[i] / 2;
498 throw PixelFormatError ("make_part_black()", _pixel_format);
506 switch (_pixel_format) {
507 case AV_PIX_FMT_YUV420P:
508 case AV_PIX_FMT_YUV422P:
509 case AV_PIX_FMT_YUV444P:
510 case AV_PIX_FMT_YUV411P:
511 memset (data()[0], 0, sample_size(0).height * stride()[0]);
512 memset (data()[1], eight_bit_uv, sample_size(1).height * stride()[1]);
513 memset (data()[2], eight_bit_uv, sample_size(2).height * stride()[2]);
516 case AV_PIX_FMT_YUVJ420P:
517 case AV_PIX_FMT_YUVJ422P:
518 case AV_PIX_FMT_YUVJ444P:
519 memset (data()[0], 0, sample_size(0).height * stride()[0]);
520 memset (data()[1], eight_bit_uv + 1, sample_size(1).height * stride()[1]);
521 memset (data()[2], eight_bit_uv + 1, sample_size(2).height * stride()[2]);
524 case AV_PIX_FMT_YUV422P9LE:
525 case AV_PIX_FMT_YUV444P9LE:
526 yuv_16_black (nine_bit_uv, false);
529 case AV_PIX_FMT_YUV422P9BE:
530 case AV_PIX_FMT_YUV444P9BE:
531 yuv_16_black (swap_16 (nine_bit_uv), false);
534 case AV_PIX_FMT_YUV422P10LE:
535 case AV_PIX_FMT_YUV444P10LE:
536 yuv_16_black (ten_bit_uv, false);
539 case AV_PIX_FMT_YUV422P16LE:
540 case AV_PIX_FMT_YUV444P16LE:
541 yuv_16_black (sixteen_bit_uv, false);
544 case AV_PIX_FMT_YUV444P10BE:
545 case AV_PIX_FMT_YUV422P10BE:
546 yuv_16_black (swap_16 (ten_bit_uv), false);
549 case AV_PIX_FMT_YUVA420P9BE:
550 case AV_PIX_FMT_YUVA422P9BE:
551 case AV_PIX_FMT_YUVA444P9BE:
552 yuv_16_black (swap_16 (nine_bit_uv), true);
555 case AV_PIX_FMT_YUVA420P9LE:
556 case AV_PIX_FMT_YUVA422P9LE:
557 case AV_PIX_FMT_YUVA444P9LE:
558 yuv_16_black (nine_bit_uv, true);
561 case AV_PIX_FMT_YUVA420P10BE:
562 case AV_PIX_FMT_YUVA422P10BE:
563 case AV_PIX_FMT_YUVA444P10BE:
564 yuv_16_black (swap_16 (ten_bit_uv), true);
567 case AV_PIX_FMT_YUVA420P10LE:
568 case AV_PIX_FMT_YUVA422P10LE:
569 case AV_PIX_FMT_YUVA444P10LE:
570 yuv_16_black (ten_bit_uv, true);
573 case AV_PIX_FMT_YUVA420P16BE:
574 case AV_PIX_FMT_YUVA422P16BE:
575 case AV_PIX_FMT_YUVA444P16BE:
576 yuv_16_black (swap_16 (sixteen_bit_uv), true);
579 case AV_PIX_FMT_YUVA420P16LE:
580 case AV_PIX_FMT_YUVA422P16LE:
581 case AV_PIX_FMT_YUVA444P16LE:
582 yuv_16_black (sixteen_bit_uv, true);
585 case AV_PIX_FMT_RGB24:
586 case AV_PIX_FMT_ARGB:
587 case AV_PIX_FMT_RGBA:
588 case AV_PIX_FMT_ABGR:
589 case AV_PIX_FMT_BGRA:
590 case AV_PIX_FMT_RGB555LE:
591 case AV_PIX_FMT_RGB48LE:
592 case AV_PIX_FMT_RGB48BE:
593 case AV_PIX_FMT_XYZ12LE:
594 memset (data()[0], 0, sample_size(0).height * stride()[0]);
597 case AV_PIX_FMT_UYVY422:
599 int const Y = sample_size(0).height;
600 int const X = line_size()[0];
601 uint8_t* p = data()[0];
602 for (int y = 0; y < Y; ++y) {
603 for (int x = 0; x < X / 4; ++x) {
604 *p++ = eight_bit_uv; // Cb
606 *p++ = eight_bit_uv; // Cr
614 throw PixelFormatError ("make_black()", _pixel_format);
620 Image::make_transparent ()
622 if (_pixel_format != AV_PIX_FMT_BGRA && _pixel_format != AV_PIX_FMT_RGBA && _pixel_format != AV_PIX_FMT_RGBA64BE) {
623 throw PixelFormatError ("make_transparent()", _pixel_format);
626 memset (data()[0], 0, sample_size(0).height * stride()[0]);
635 uint8_t* const* data;
639 uint8_t* line_pointer(int y) const {
640 return data[0] + y * stride[0] + start_x * bpp;
645 /** Parameters of the other image (the one being blended onto the target) when target and other are RGB */
646 struct OtherRGBParams
651 uint8_t* const* data;
655 uint8_t* line_pointer(int y) const {
656 return data[0] + y * stride[0];
659 float alpha_divisor() const {
660 return pow(2, bpp * 2) - 1;
665 /** Parameters of the other image (the one being blended onto the target) when target and other are YUV */
666 struct OtherYUVParams
671 uint8_t* const* data;
676 template <class OtherType>
678 alpha_blend_onto_rgb24(TargetParams const& target, OtherRGBParams const& other, int red, int blue, std::function<float (OtherType*)> get, int value_divisor)
680 /* Going onto RGB24. First byte is red, second green, third blue */
681 auto const alpha_divisor = other.alpha_divisor();
682 for (int ty = target.start_y, oy = other.start_y; ty < target.size.height && oy < other.size.height; ++ty, ++oy) {
683 auto tp = target.line_pointer(ty);
684 auto op = reinterpret_cast<OtherType*>(other.line_pointer(oy));
685 for (int tx = target.start_x, ox = other.start_x; tx < target.size.width && ox < other.size.width; ++tx, ++ox) {
686 float const alpha = get(op + 3) / alpha_divisor;
687 tp[0] = (get(op + red) / value_divisor) * alpha + tp[0] * (1 - alpha);
688 tp[1] = (get(op + 1) / value_divisor) * alpha + tp[1] * (1 - alpha);
689 tp[2] = (get(op + blue) / value_divisor) * alpha + tp[2] * (1 - alpha);
692 op += other.bpp / sizeof(OtherType);
698 template <class OtherType>
700 alpha_blend_onto_bgra(TargetParams const& target, OtherRGBParams const& other, int red, int blue, std::function<float (OtherType*)> get, int value_divisor)
702 auto const alpha_divisor = other.alpha_divisor();
703 for (int ty = target.start_y, oy = other.start_y; ty < target.size.height && oy < other.size.height; ++ty, ++oy) {
704 auto tp = target.line_pointer(ty);
705 auto op = reinterpret_cast<OtherType*>(other.line_pointer(oy));
706 for (int tx = target.start_x, ox = other.start_x; tx < target.size.width && ox < other.size.width; ++tx, ++ox) {
707 float const alpha = get(op + 3) / alpha_divisor;
708 tp[0] = (get(op + blue) / value_divisor) * alpha + tp[0] * (1 - alpha);
709 tp[1] = (get(op + 1) / value_divisor) * alpha + tp[1] * (1 - alpha);
710 tp[2] = (get(op + red) / value_divisor) * alpha + tp[2] * (1 - alpha);
711 tp[3] = (get(op + 3) / value_divisor) * alpha + tp[3] * (1 - alpha);
714 op += other.bpp / sizeof(OtherType);
720 template <class OtherType>
722 alpha_blend_onto_rgba(TargetParams const& target, OtherRGBParams const& other, int red, int blue, std::function<float (OtherType*)> get, int value_divisor)
724 auto const alpha_divisor = other.alpha_divisor();
725 for (int ty = target.start_y, oy = other.start_y; ty < target.size.height && oy < other.size.height; ++ty, ++oy) {
726 auto tp = target.line_pointer(ty);
727 auto op = reinterpret_cast<OtherType*>(other.line_pointer(oy));
728 for (int tx = target.start_x, ox = other.start_x; tx < target.size.width && ox < other.size.width; ++tx, ++ox) {
729 float const alpha = get(op + 3) / alpha_divisor;
730 tp[0] = (get(op + red) / value_divisor) * alpha + tp[0] * (1 - alpha);
731 tp[1] = (get(op + 1) / value_divisor) * alpha + tp[1] * (1 - alpha);
732 tp[2] = (get(op + blue) / value_divisor) * alpha + tp[2] * (1 - alpha);
733 tp[3] = (get(op + 3) / value_divisor) * alpha + tp[3] * (1 - alpha);
736 op += other.bpp / sizeof(OtherType);
742 template <class OtherType>
744 alpha_blend_onto_rgb48le(TargetParams const& target, OtherRGBParams const& other, int red, int blue, std::function<float (OtherType*)> get, int value_scale)
746 auto const alpha_divisor = other.alpha_divisor();
747 for (int ty = target.start_y, oy = other.start_y; ty < target.size.height && oy < other.size.height; ++ty, ++oy) {
748 auto tp = reinterpret_cast<uint16_t*>(target.line_pointer(ty));
749 auto op = reinterpret_cast<OtherType*>(other.line_pointer(oy));
750 for (int tx = target.start_x, ox = other.start_x; tx < target.size.width && ox < other.size.width; ++tx, ++ox) {
751 float const alpha = get(op + 3) / alpha_divisor;
752 tp[0] = get(op + red) * value_scale * alpha + tp[0] * (1 - alpha);
753 tp[1] = get(op + 1) * value_scale * alpha + tp[1] * (1 - alpha);
754 tp[2] = get(op + blue) * value_scale * alpha + tp[2] * (1 - alpha);
756 tp += target.bpp / 2;
757 op += other.bpp / sizeof(OtherType);
763 template <class OtherType>
765 alpha_blend_onto_xyz12le(TargetParams const& target, OtherRGBParams const& other, int red, int blue, std::function<float (OtherType*)> get, int value_divisor)
767 auto const alpha_divisor = other.alpha_divisor();
768 auto conv = dcp::ColourConversion::srgb_to_xyz();
769 double fast_matrix[9];
770 dcp::combined_rgb_to_xyz(conv, fast_matrix);
771 auto lut_in = conv.in()->double_lut(0, 1, 8, false);
772 auto lut_out = conv.out()->int_lut(0, 1, 16, true, 65535);
773 for (int ty = target.start_y, oy = other.start_y; ty < target.size.height && oy < other.size.height; ++ty, ++oy) {
774 auto tp = reinterpret_cast<uint16_t*>(target.data[0] + ty * target.stride[0] + target.start_x * target.bpp);
775 auto op = reinterpret_cast<OtherType*>(other.data[0] + oy * other.stride[0]);
776 for (int tx = target.start_x, ox = other.start_x; tx < target.size.width && ox < other.size.width; ++tx, ++ox) {
777 float const alpha = get(op + 3) / alpha_divisor;
779 /* Convert sRGB to XYZ; op is BGRA. First, input gamma LUT */
780 double const r = lut_in[get(op + red) / value_divisor];
781 double const g = lut_in[get(op + 1) / value_divisor];
782 double const b = lut_in[get(op + blue) / value_divisor];
784 /* RGB to XYZ, including Bradford transform and DCI companding */
785 double const x = max(0.0, min(1.0, r * fast_matrix[0] + g * fast_matrix[1] + b * fast_matrix[2]));
786 double const y = max(0.0, min(1.0, r * fast_matrix[3] + g * fast_matrix[4] + b * fast_matrix[5]));
787 double const z = max(0.0, min(1.0, r * fast_matrix[6] + g * fast_matrix[7] + b * fast_matrix[8]));
789 /* Out gamma LUT and blend */
790 tp[0] = lut_out[lrint(x * 65535)] * alpha + tp[0] * (1 - alpha);
791 tp[1] = lut_out[lrint(y * 65535)] * alpha + tp[1] * (1 - alpha);
792 tp[2] = lut_out[lrint(z * 65535)] * alpha + tp[2] * (1 - alpha);
794 tp += target.bpp / 2;
795 op += other.bpp / sizeof(OtherType);
803 alpha_blend_onto_yuv420p(TargetParams const& target, OtherYUVParams const& other, uint8_t* const* alpha_data, int const* alpha_stride)
805 auto const ts = target.size;
806 auto const os = other.size;
807 for (int ty = target.start_y, oy = other.start_y; ty < ts.height && oy < os.height; ++ty, ++oy) {
808 int const hty = ty / 2;
809 int const hoy = oy / 2;
810 uint8_t* tY = target.data[0] + (ty * target.stride[0]) + target.start_x;
811 uint8_t* tU = target.data[1] + (hty * target.stride[1]) + target.start_x / 2;
812 uint8_t* tV = target.data[2] + (hty * target.stride[2]) + target.start_x / 2;
813 uint8_t* oY = other.data[0] + (oy * other.stride[0]) + other.start_x;
814 uint8_t* oU = other.data[1] + (hoy * other.stride[1]) + other.start_x / 2;
815 uint8_t* oV = other.data[2] + (hoy * other.stride[2]) + other.start_x / 2;
816 uint8_t* alpha = alpha_data[0] + (oy * alpha_stride[0]) + other.start_x * 4;
817 for (int tx = target.start_x, ox = other.start_x; tx < ts.width && ox < os.width; ++tx, ++ox) {
818 float const a = float(alpha[3]) / 255;
819 *tY = *oY * a + *tY * (1 - a);
820 *tU = *oU * a + *tU * (1 - a);
821 *tV = *oV * a + *tV * (1 - a);
840 alpha_blend_onto_yuv420p10(TargetParams const& target, OtherYUVParams const& other, uint8_t* const* alpha_data, int const* alpha_stride)
842 auto const ts = target.size;
843 auto const os = other.size;
844 for (int ty = target.start_y, oy = other.start_y; ty < ts.height && oy < os.height; ++ty, ++oy) {
845 int const hty = ty / 2;
846 int const hoy = oy / 2;
847 uint16_t* tY = reinterpret_cast<uint16_t*>(target.data[0] + (ty * target.stride[0])) + target.start_x;
848 uint16_t* tU = reinterpret_cast<uint16_t*>(target.data[1] + (hty * target.stride[1])) + target.start_x / 2;
849 uint16_t* tV = reinterpret_cast<uint16_t*>(target.data[2] + (hty * target.stride[2])) + target.start_x / 2;
850 uint16_t* oY = reinterpret_cast<uint16_t*>(other.data[0] + (oy * other.stride[0])) + other.start_x;
851 uint16_t* oU = reinterpret_cast<uint16_t*>(other.data[1] + (hoy * other.stride[1])) + other.start_x / 2;
852 uint16_t* oV = reinterpret_cast<uint16_t*>(other.data[2] + (hoy * other.stride[2])) + other.start_x / 2;
853 uint8_t* alpha = alpha_data[0] + (oy * alpha_stride[0]) + other.start_x * 4;
854 for (int tx = target.start_x, ox = other.start_x; tx < ts.width && ox < os.width; ++tx, ++ox) {
855 float const a = float(alpha[3]) / 255;
856 *tY = *oY * a + *tY * (1 - a);
857 *tU = *oU * a + *tU * (1 - a);
858 *tV = *oV * a + *tV * (1 - a);
877 alpha_blend_onto_yuv422p9or10le(TargetParams const& target, OtherYUVParams const& other, uint8_t* const* alpha_data, int const* alpha_stride)
879 auto const ts = target.size;
880 auto const os = other.size;
881 for (int ty = target.start_y, oy = other.start_y; ty < ts.height && oy < os.height; ++ty, ++oy) {
882 uint16_t* tY = reinterpret_cast<uint16_t*>(target.data[0] + (ty * target.stride[0])) + target.start_x;
883 uint16_t* tU = reinterpret_cast<uint16_t*>(target.data[1] + (ty * target.stride[1])) + target.start_x / 2;
884 uint16_t* tV = reinterpret_cast<uint16_t*>(target.data[2] + (ty * target.stride[2])) + target.start_x / 2;
885 uint16_t* oY = reinterpret_cast<uint16_t*>(other.data[0] + (oy * other.stride[0])) + other.start_x;
886 uint16_t* oU = reinterpret_cast<uint16_t*>(other.data[1] + (oy * other.stride[1])) + other.start_x / 2;
887 uint16_t* oV = reinterpret_cast<uint16_t*>(other.data[2] + (oy * other.stride[2])) + other.start_x / 2;
888 uint8_t* alpha = alpha_data[0] + (oy * alpha_stride[0]) + other.start_x * 4;
889 for (int tx = target.start_x, ox = other.start_x; tx < ts.width && ox < os.width; ++tx, ++ox) {
890 float const a = float(alpha[3]) / 255;
891 *tY = *oY * a + *tY * (1 - a);
892 *tU = *oU * a + *tU * (1 - a);
893 *tV = *oV * a + *tV * (1 - a);
911 Image::alpha_blend (shared_ptr<const Image> other, Position<int> position)
914 other->pixel_format() == AV_PIX_FMT_BGRA ||
915 other->pixel_format() == AV_PIX_FMT_RGBA ||
916 other->pixel_format() == AV_PIX_FMT_RGBA64BE
919 int const blue = other->pixel_format() == AV_PIX_FMT_BGRA ? 0 : 2;
920 int const red = other->pixel_format() == AV_PIX_FMT_BGRA ? 2 : 0;
922 int start_tx = position.x;
926 start_ox = -start_tx;
930 int start_ty = position.y;
934 start_oy = -start_ty;
938 TargetParams target_params = {
947 OtherRGBParams other_rgb_params = {
953 other->pixel_format() == AV_PIX_FMT_RGBA64BE ? 8 : 4
956 OtherYUVParams other_yuv_params = {
964 auto byteswap = [](uint16_t* p) {
965 return (*p >> 8) | ((*p & 0xff) << 8);
968 auto pass = [](uint8_t* p) {
972 switch (_pixel_format) {
973 case AV_PIX_FMT_RGB24:
974 target_params.bpp = 3;
975 if (other->pixel_format() == AV_PIX_FMT_RGBA64BE) {
976 alpha_blend_onto_rgb24<uint16_t>(target_params, other_rgb_params, red, blue, byteswap, 256);
978 alpha_blend_onto_rgb24<uint8_t>(target_params, other_rgb_params, red, blue, pass, 1);
981 case AV_PIX_FMT_BGRA:
982 target_params.bpp = 4;
983 if (other->pixel_format() == AV_PIX_FMT_RGBA64BE) {
984 alpha_blend_onto_bgra<uint16_t>(target_params, other_rgb_params, red, blue, byteswap, 256);
986 alpha_blend_onto_bgra<uint8_t>(target_params, other_rgb_params, red, blue, pass, 1);
989 case AV_PIX_FMT_RGBA:
990 target_params.bpp = 4;
991 if (other->pixel_format() == AV_PIX_FMT_RGBA64BE) {
992 alpha_blend_onto_rgba<uint16_t>(target_params, other_rgb_params, red, blue, byteswap, 256);
994 alpha_blend_onto_rgba<uint8_t>(target_params, other_rgb_params, red, blue, pass, 1);
997 case AV_PIX_FMT_RGB48LE:
998 target_params.bpp = 6;
999 if (other->pixel_format() == AV_PIX_FMT_RGBA64BE) {
1000 alpha_blend_onto_rgb48le<uint16_t>(target_params, other_rgb_params, red, blue, byteswap, 1);
1002 alpha_blend_onto_rgb48le<uint8_t>(target_params, other_rgb_params, red, blue, pass, 256);
1005 case AV_PIX_FMT_XYZ12LE:
1006 target_params.bpp = 6;
1007 if (other->pixel_format() == AV_PIX_FMT_RGBA64BE) {
1008 alpha_blend_onto_xyz12le<uint16_t>(target_params, other_rgb_params, red, blue, byteswap, 256);
1010 alpha_blend_onto_xyz12le<uint8_t>(target_params, other_rgb_params, red, blue, pass, 1);
1013 case AV_PIX_FMT_YUV420P:
1015 auto yuv = other->convert_pixel_format (dcp::YUVToRGB::REC709, _pixel_format, Alignment::COMPACT, false);
1016 other_yuv_params.data = yuv->data();
1017 other_yuv_params.stride = yuv->stride();
1018 alpha_blend_onto_yuv420p(target_params, other_yuv_params, other->data(), other->stride());
1021 case AV_PIX_FMT_YUV420P10:
1023 auto yuv = other->convert_pixel_format (dcp::YUVToRGB::REC709, _pixel_format, Alignment::COMPACT, false);
1024 other_yuv_params.data = yuv->data();
1025 other_yuv_params.stride = yuv->stride();
1026 alpha_blend_onto_yuv420p10(target_params, other_yuv_params, other->data(), other->stride());
1029 case AV_PIX_FMT_YUV422P9LE:
1030 case AV_PIX_FMT_YUV422P10LE:
1032 auto yuv = other->convert_pixel_format (dcp::YUVToRGB::REC709, _pixel_format, Alignment::COMPACT, false);
1033 other_yuv_params.data = yuv->data();
1034 other_yuv_params.stride = yuv->stride();
1035 alpha_blend_onto_yuv422p9or10le(target_params, other_yuv_params, other->data(), other->stride());
1039 throw PixelFormatError ("alpha_blend()", _pixel_format);
1045 Image::copy (shared_ptr<const Image> other, Position<int> position)
1047 /* Only implemented for RGB24 onto RGB24 so far */
1048 DCPOMATIC_ASSERT (_pixel_format == AV_PIX_FMT_RGB24 && other->pixel_format() == AV_PIX_FMT_RGB24);
1049 DCPOMATIC_ASSERT (position.x >= 0 && position.y >= 0);
1051 int const N = min (position.x + other->size().width, size().width) - position.x;
1052 for (int ty = position.y, oy = 0; ty < size().height && oy < other->size().height; ++ty, ++oy) {
1053 uint8_t * const tp = data()[0] + ty * stride()[0] + position.x * 3;
1054 uint8_t * const op = other->data()[0] + oy * other->stride()[0];
1055 memcpy (tp, op, N * 3);
1061 Image::read_from_socket (shared_ptr<Socket> socket)
1063 for (int i = 0; i < planes(); ++i) {
1064 uint8_t* p = data()[i];
1065 int const lines = sample_size(i).height;
1066 for (int y = 0; y < lines; ++y) {
1067 socket->read (p, line_size()[i]);
1075 Image::write_to_socket (shared_ptr<Socket> socket) const
1077 for (int i = 0; i < planes(); ++i) {
1078 uint8_t* p = data()[i];
1079 int const lines = sample_size(i).height;
1080 for (int y = 0; y < lines; ++y) {
1081 socket->write (p, line_size()[i]);
1089 Image::bytes_per_pixel (int c) const
1091 auto d = av_pix_fmt_desc_get(_pixel_format);
1093 throw PixelFormatError ("bytes_per_pixel()", _pixel_format);
1096 if (c >= planes()) {
1100 float bpp[4] = { 0, 0, 0, 0 };
1102 #ifdef DCPOMATIC_HAVE_AVCOMPONENTDESCRIPTOR_DEPTH_MINUS1
1103 bpp[0] = floor ((d->comp[0].depth_minus1 + 8) / 8);
1104 if (d->nb_components > 1) {
1105 bpp[1] = floor ((d->comp[1].depth_minus1 + 8) / 8) / pow (2.0f, d->log2_chroma_w);
1107 if (d->nb_components > 2) {
1108 bpp[2] = floor ((d->comp[2].depth_minus1 + 8) / 8) / pow (2.0f, d->log2_chroma_w);
1110 if (d->nb_components > 3) {
1111 bpp[3] = floor ((d->comp[3].depth_minus1 + 8) / 8) / pow (2.0f, d->log2_chroma_w);
1114 bpp[0] = floor ((d->comp[0].depth + 7) / 8);
1115 if (d->nb_components > 1) {
1116 bpp[1] = floor ((d->comp[1].depth + 7) / 8) / pow (2.0f, d->log2_chroma_w);
1118 if (d->nb_components > 2) {
1119 bpp[2] = floor ((d->comp[2].depth + 7) / 8) / pow (2.0f, d->log2_chroma_w);
1121 if (d->nb_components > 3) {
1122 bpp[3] = floor ((d->comp[3].depth + 7) / 8) / pow (2.0f, d->log2_chroma_w);
1126 if ((d->flags & AV_PIX_FMT_FLAG_PLANAR) == 0) {
1127 /* Not planar; sum them up */
1128 return bpp[0] + bpp[1] + bpp[2] + bpp[3];
1135 /** Construct a Image of a given size and format, allocating memory
1138 * @param p Pixel format.
1139 * @param s Size in pixels.
1140 * @param alignment PADDED to make each row of this image aligned to a ALIGNMENT-byte boundary, otherwise COMPACT.
1142 Image::Image (AVPixelFormat p, dcp::Size s, Alignment alignment)
1145 , _alignment (alignment)
1154 _data = (uint8_t **) wrapped_av_malloc (4 * sizeof (uint8_t *));
1155 _data[0] = _data[1] = _data[2] = _data[3] = 0;
1157 _line_size = (int *) wrapped_av_malloc (4 * sizeof (int));
1158 _line_size[0] = _line_size[1] = _line_size[2] = _line_size[3] = 0;
1160 _stride = (int *) wrapped_av_malloc (4 * sizeof (int));
1161 _stride[0] = _stride[1] = _stride[2] = _stride[3] = 0;
1163 auto stride_round_up = [](int stride, int t) {
1164 int const a = stride + (t - 1);
1168 for (int i = 0; i < planes(); ++i) {
1169 _line_size[i] = ceil (_size.width * bytes_per_pixel(i));
1170 _stride[i] = stride_round_up (_line_size[i], _alignment == Alignment::PADDED ? ALIGNMENT : 1);
1172 /* The assembler function ff_rgb24ToY_avx (in libswscale/x86/input.asm)
1173 uses a 16-byte fetch to read three bytes (R/G/B) of image data.
1174 Hence on the last pixel of the last line it reads over the end of
1175 the actual data by 1 byte. If the width of an image is a multiple
1176 of the stride alignment there will be no padding at the end of image lines.
1177 OS X crashes on this illegal read, though other operating systems don't
1178 seem to mind. The nasty + 1 in this malloc makes sure there is always a byte
1179 for that instruction to read safely.
1181 Further to the above, valgrind is now telling me that ff_rgb24ToY_ssse3
1182 over-reads by more then _avx. I can't follow the code to work out how much,
1183 so I'll just over-allocate by ALIGNMENT bytes and have done with it. Empirical
1184 testing suggests that it works.
1186 In addition to these concerns, we may read/write as much as a whole extra line
1187 at the end of each plane in cases where we are messing with offsets in order to
1188 do pad or crop. To solve this we over-allocate by an extra _stride[i] bytes.
1190 As an example: we may write to images starting at an offset so we get some padding.
1191 Hence we want to write in the following pattern:
1193 block start write start line end
1194 |..(padding)..|<------line-size------------->|..(padding)..|
1195 |..(padding)..|<------line-size------------->|..(padding)..|
1196 |..(padding)..|<------line-size------------->|..(padding)..|
1198 where line-size is of the smaller (inter_size) image and the full padded line length is that of
1199 out_size. To get things to work we have to tell FFmpeg that the stride is that of out_size.
1200 However some parts of FFmpeg (notably rgb48Toxyz12 in swscale.c) process data for the full
1201 specified *stride*. This does not matter until we get to the last line:
1203 block start write start line end
1204 |..(padding)..|<------line-size------------->|XXXwrittenXXX|
1205 |XXXwrittenXXX|<------line-size------------->|XXXwrittenXXX|
1206 |XXXwrittenXXX|<------line-size------------->|XXXwrittenXXXXXXwrittenXXX
1209 _data[i] = (uint8_t *) wrapped_av_malloc (_stride[i] * (sample_size(i).height + 1) + ALIGNMENT);
1210 #if HAVE_VALGRIND_MEMCHECK_H
1211 /* The data between the end of the line size and the stride is undefined but processed by
1212 libswscale, causing lots of valgrind errors. Mark it all defined to quell these errors.
1214 VALGRIND_MAKE_MEM_DEFINED (_data[i], _stride[i] * (sample_size(i).height + 1) + ALIGNMENT);
1220 Image::Image (Image const & other)
1221 : std::enable_shared_from_this<Image>(other)
1222 , _size (other._size)
1223 , _pixel_format (other._pixel_format)
1224 , _alignment (other._alignment)
1228 for (int i = 0; i < planes(); ++i) {
1229 uint8_t* p = _data[i];
1230 uint8_t* q = other._data[i];
1231 int const lines = sample_size(i).height;
1232 for (int j = 0; j < lines; ++j) {
1233 memcpy (p, q, _line_size[i]);
1235 q += other.stride()[i];
1241 Image::Image (AVFrame const * frame, Alignment alignment)
1242 : _size (frame->width, frame->height)
1243 , _pixel_format (static_cast<AVPixelFormat>(frame->format))
1244 , _alignment (alignment)
1246 DCPOMATIC_ASSERT (_pixel_format != AV_PIX_FMT_NONE);
1250 for (int i = 0; i < planes(); ++i) {
1251 uint8_t* p = _data[i];
1252 uint8_t* q = frame->data[i];
1253 int const lines = sample_size(i).height;
1254 for (int j = 0; j < lines; ++j) {
1255 memcpy (p, q, _line_size[i]);
1257 /* AVFrame's linesize is what we call `stride' */
1258 q += frame->linesize[i];
1264 Image::Image (shared_ptr<const Image> other, Alignment alignment)
1265 : _size (other->_size)
1266 , _pixel_format (other->_pixel_format)
1267 , _alignment (alignment)
1271 for (int i = 0; i < planes(); ++i) {
1272 DCPOMATIC_ASSERT (line_size()[i] == other->line_size()[i]);
1273 uint8_t* p = _data[i];
1274 uint8_t* q = other->data()[i];
1275 int const lines = sample_size(i).height;
1276 for (int j = 0; j < lines; ++j) {
1277 memcpy (p, q, line_size()[i]);
1279 q += other->stride()[i];
1286 Image::operator= (Image const & other)
1288 if (this == &other) {
1299 Image::swap (Image & other)
1301 std::swap (_size, other._size);
1302 std::swap (_pixel_format, other._pixel_format);
1304 for (int i = 0; i < 4; ++i) {
1305 std::swap (_data[i], other._data[i]);
1306 std::swap (_line_size[i], other._line_size[i]);
1307 std::swap (_stride[i], other._stride[i]);
1310 std::swap (_alignment, other._alignment);
1316 for (int i = 0; i < planes(); ++i) {
1321 av_free (_line_size);
1327 Image::data () const
1334 Image::line_size () const
1341 Image::stride () const
1348 Image::size () const
1355 Image::alignment () const
1362 merge (list<PositionImage> images, Image::Alignment alignment)
1364 if (images.empty ()) {
1368 if (images.size() == 1) {
1369 images.front().image = Image::ensure_alignment(images.front().image, alignment);
1370 return images.front();
1373 dcpomatic::Rect<int> all (images.front().position, images.front().image->size().width, images.front().image->size().height);
1374 for (auto const& i: images) {
1375 all.extend (dcpomatic::Rect<int>(i.position, i.image->size().width, i.image->size().height));
1378 auto merged = make_shared<Image>(images.front().image->pixel_format(), dcp::Size(all.width, all.height), alignment);
1379 merged->make_transparent ();
1380 for (auto const& i: images) {
1381 merged->alpha_blend (i.image, i.position - all.position());
1384 return PositionImage (merged, all.position ());
1389 operator== (Image const & a, Image const & b)
1391 if (a.planes() != b.planes() || a.pixel_format() != b.pixel_format() || a.alignment() != b.alignment()) {
1395 for (int c = 0; c < a.planes(); ++c) {
1396 if (a.sample_size(c).height != b.sample_size(c).height || a.line_size()[c] != b.line_size()[c] || a.stride()[c] != b.stride()[c]) {
1400 uint8_t* p = a.data()[c];
1401 uint8_t* q = b.data()[c];
1402 int const lines = a.sample_size(c).height;
1403 for (int y = 0; y < lines; ++y) {
1404 if (memcmp (p, q, a.line_size()[c]) != 0) {
1418 * @param f Amount to fade by; 0 is black, 1 is no fade.
1421 Image::fade (float f)
1423 /* U/V black value for 8-bit colour */
1424 static int const eight_bit_uv = (1 << 7) - 1;
1425 /* U/V black value for 10-bit colour */
1426 static uint16_t const ten_bit_uv = (1 << 9) - 1;
1428 switch (_pixel_format) {
1429 case AV_PIX_FMT_YUV420P:
1432 uint8_t* p = data()[0];
1433 int const lines = sample_size(0).height;
1434 for (int y = 0; y < lines; ++y) {
1436 for (int x = 0; x < line_size()[0]; ++x) {
1437 *q = int(float(*q) * f);
1444 for (int c = 1; c < 3; ++c) {
1445 uint8_t* p = data()[c];
1446 int const lines = sample_size(c).height;
1447 for (int y = 0; y < lines; ++y) {
1449 for (int x = 0; x < line_size()[c]; ++x) {
1450 *q = eight_bit_uv + int((int(*q) - eight_bit_uv) * f);
1460 case AV_PIX_FMT_RGB24:
1463 uint8_t* p = data()[0];
1464 int const lines = sample_size(0).height;
1465 for (int y = 0; y < lines; ++y) {
1467 for (int x = 0; x < line_size()[0]; ++x) {
1468 *q = int (float (*q) * f);
1476 case AV_PIX_FMT_XYZ12LE:
1477 case AV_PIX_FMT_RGB48LE:
1478 /* 16-bit little-endian */
1479 for (int c = 0; c < 3; ++c) {
1480 int const stride_pixels = stride()[c] / 2;
1481 int const line_size_pixels = line_size()[c] / 2;
1482 uint16_t* p = reinterpret_cast<uint16_t*> (data()[c]);
1483 int const lines = sample_size(c).height;
1484 for (int y = 0; y < lines; ++y) {
1486 for (int x = 0; x < line_size_pixels; ++x) {
1487 *q = int (float (*q) * f);
1495 case AV_PIX_FMT_YUV422P10LE:
1499 int const stride_pixels = stride()[0] / 2;
1500 int const line_size_pixels = line_size()[0] / 2;
1501 uint16_t* p = reinterpret_cast<uint16_t*> (data()[0]);
1502 int const lines = sample_size(0).height;
1503 for (int y = 0; y < lines; ++y) {
1505 for (int x = 0; x < line_size_pixels; ++x) {
1506 *q = int(float(*q) * f);
1514 for (int c = 1; c < 3; ++c) {
1515 int const stride_pixels = stride()[c] / 2;
1516 int const line_size_pixels = line_size()[c] / 2;
1517 uint16_t* p = reinterpret_cast<uint16_t*> (data()[c]);
1518 int const lines = sample_size(c).height;
1519 for (int y = 0; y < lines; ++y) {
1521 for (int x = 0; x < line_size_pixels; ++x) {
1522 *q = ten_bit_uv + int((int(*q) - ten_bit_uv) * f);
1533 throw PixelFormatError ("fade()", _pixel_format);
1538 shared_ptr<const Image>
1539 Image::ensure_alignment (shared_ptr<const Image> image, Image::Alignment alignment)
1541 if (image->alignment() == alignment) {
1545 return make_shared<Image>(image, alignment);
1550 Image::memory_used () const
1553 for (int i = 0; i < planes(); ++i) {
1554 m += _stride[i] * sample_size(i).height;
1561 Image::video_range_to_full_range ()
1563 switch (_pixel_format) {
1564 case AV_PIX_FMT_RGB24:
1566 float const factor = 256.0 / 219.0;
1567 uint8_t* p = data()[0];
1568 int const lines = sample_size(0).height;
1569 for (int y = 0; y < lines; ++y) {
1571 for (int x = 0; x < line_size()[0]; ++x) {
1572 *q = clamp(lrintf((*q - 16) * factor), 0L, 255L);
1579 case AV_PIX_FMT_RGB48LE:
1581 float const factor = 65536.0 / 56064.0;
1582 uint16_t* p = reinterpret_cast<uint16_t*>(data()[0]);
1583 int const lines = sample_size(0).height;
1584 for (int y = 0; y < lines; ++y) {
1586 int const line_size_pixels = line_size()[0] / 2;
1587 for (int x = 0; x < line_size_pixels; ++x) {
1588 *q = clamp(lrintf((*q - 4096) * factor), 0L, 65535L);
1591 p += stride()[0] / 2;
1595 case AV_PIX_FMT_GBRP12LE:
1597 float const factor = 4096.0 / 3504.0;
1598 for (int c = 0; c < 3; ++c) {
1599 uint16_t* p = reinterpret_cast<uint16_t*>(data()[c]);
1600 int const lines = sample_size(c).height;
1601 for (int y = 0; y < lines; ++y) {
1603 int const line_size_pixels = line_size()[c] / 2;
1604 for (int x = 0; x < line_size_pixels; ++x) {
1605 *q = clamp(lrintf((*q - 256) * factor), 0L, 4095L);
1613 throw PixelFormatError ("video_range_to_full_range()", _pixel_format);