2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /** @file src/image.cc
21 * @brief A set of classes to describe video images.
28 #include <boost/algorithm/string.hpp>
29 #include <boost/bind.hpp>
32 #include <libavcodec/avcodec.h>
33 #include <libavformat/avformat.h>
34 #include <libswscale/swscale.h>
35 #include <libavfilter/avfiltergraph.h>
36 #include <libpostproc/postprocess.h>
37 #include <libavutil/pixfmt.h>
38 #include <libavutil/pixdesc.h>
41 #include "exceptions.h"
49 using boost::shared_ptr;
53 Image::swap (Image& other)
55 std::swap (_pixel_format, other._pixel_format);
59 Image::line_factor (int n) const
65 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get(_pixel_format);
67 throw PixelFormatError (N_("lines()"), _pixel_format);
70 return pow (2.0f, d->log2_chroma_h);
73 /** @param n Component index.
74 * @return Number of lines in the image for the given component.
77 Image::lines (int n) const
79 return rint (ceil (static_cast<double>(size().height) / line_factor (n)));
82 /** @return Number of components */
84 Image::components () const
86 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get(_pixel_format);
88 throw PixelFormatError (N_("components()"), _pixel_format);
91 if ((d->flags & PIX_FMT_PLANAR) == 0) {
95 return d->nb_components;
99 Image::scale (libdcp::Size out_size, Scaler const * scaler, bool result_aligned) const
102 /* Empirical testing suggests that sws_scale() will crash if
103 the input image is not aligned.
107 shared_ptr<Image> scaled (new SimpleImage (pixel_format(), out_size, result_aligned));
109 struct SwsContext* scale_context = sws_getContext (
110 size().width, size().height, pixel_format(),
111 out_size.width, out_size.height, pixel_format(),
112 scaler->ffmpeg_id (), 0, 0, 0
119 scaled->data(), scaled->stride()
122 sws_freeContext (scale_context);
127 /** Scale this image to a given size and convert it to RGB.
128 * @param out_size Output image size in pixels.
129 * @param scaler Scaler to use.
132 Image::scale_and_convert_to_rgb (libdcp::Size out_size, Scaler const * scaler, bool result_aligned) const
135 /* Empirical testing suggests that sws_scale() will crash if
136 the input image is not aligned.
140 shared_ptr<Image> rgb (new SimpleImage (PIX_FMT_RGB24, out_size, result_aligned));
142 struct SwsContext* scale_context = sws_getContext (
143 size().width, size().height, pixel_format(),
144 out_size.width, out_size.height, PIX_FMT_RGB24,
145 scaler->ffmpeg_id (), 0, 0, 0
148 /* Scale and convert to RGB from whatever its currently in (which may be RGB) */
153 rgb->data(), rgb->stride()
156 sws_freeContext (scale_context);
161 /** Run a FFmpeg post-process on this image and return the processed version.
162 * @param pp Flags for the required set of post processes.
163 * @return Post-processed image.
166 Image::post_process (string pp, bool aligned) const
168 shared_ptr<Image> out (new SimpleImage (pixel_format(), size (), aligned));
171 switch (pixel_format()) {
172 case PIX_FMT_YUV420P:
173 pp_format = PP_FORMAT_420;
175 case PIX_FMT_YUV422P10LE:
176 case PIX_FMT_YUV422P:
177 case PIX_FMT_UYVY422:
178 pp_format = PP_FORMAT_422;
180 case PIX_FMT_YUV444P:
181 case PIX_FMT_YUV444P9BE:
182 case PIX_FMT_YUV444P9LE:
183 case PIX_FMT_YUV444P10BE:
184 case PIX_FMT_YUV444P10LE:
185 pp_format = PP_FORMAT_444;
187 throw PixelFormatError (N_("post_process"), pixel_format());
190 pp_mode* mode = pp_get_mode_by_name_and_quality (pp.c_str (), PP_QUALITY_MAX);
191 pp_context* context = pp_get_context (size().width, size().height, pp_format | PP_CPU_CAPS_MMX2);
194 (const uint8_t **) data(), stride(),
195 out->data(), out->stride(),
196 size().width, size().height,
197 0, 0, mode, context, 0
201 pp_free_context (context);
207 Image::crop (Crop crop, bool aligned) const
209 libdcp::Size cropped_size = size ();
210 cropped_size.width -= crop.left + crop.right;
211 cropped_size.height -= crop.top + crop.bottom;
213 shared_ptr<Image> out (new SimpleImage (pixel_format(), cropped_size, aligned));
215 for (int c = 0; c < components(); ++c) {
216 int const crop_left_in_bytes = bytes_per_pixel(c) * crop.left;
217 int const cropped_width_in_bytes = bytes_per_pixel(c) * cropped_size.width;
219 /* Start of the source line, cropped from the top but not the left */
220 uint8_t* in_p = data()[c] + (crop.top / out->line_factor(c)) * stride()[c];
221 uint8_t* out_p = out->data()[c];
223 for (int y = 0; y < out->lines(c); ++y) {
224 memcpy (out_p, in_p + crop_left_in_bytes, cropped_width_in_bytes);
226 out_p += out->stride()[c];
233 /** Blacken a YUV image whose bits per pixel is rounded up to 16 */
235 Image::yuv_16_black (uint16_t v)
237 memset (data()[0], 0, lines(0) * stride()[0]);
238 for (int i = 1; i < 3; ++i) {
239 int16_t* p = reinterpret_cast<int16_t*> (data()[i]);
240 for (int y = 0; y < size().height; ++y) {
241 for (int x = 0; x < line_size()[i] / 2; ++x) {
244 p += stride()[i] / 2;
250 Image::swap_16 (uint16_t v)
252 return ((v >> 8) & 0xff) | ((v & 0xff) << 8);
258 /* U/V black value for 8-bit colour */
259 static uint8_t const eight_bit_uv = (1 << 7) - 1;
260 /* U/V black value for 9-bit colour */
261 static uint16_t const nine_bit_uv = (1 << 8) - 1;
262 /* U/V black value for 10-bit colour */
263 static uint16_t const ten_bit_uv = (1 << 9) - 1;
264 /* U/V black value for 16-bit colour */
265 static uint16_t const sixteen_bit_uv = (1 << 15) - 1;
267 switch (_pixel_format) {
268 case PIX_FMT_YUV420P:
269 case PIX_FMT_YUV422P:
270 case PIX_FMT_YUV444P:
271 memset (data()[0], 0, lines(0) * stride()[0]);
272 memset (data()[1], eight_bit_uv, lines(1) * stride()[1]);
273 memset (data()[2], eight_bit_uv, lines(2) * stride()[2]);
276 case PIX_FMT_YUVJ420P:
277 case PIX_FMT_YUVJ422P:
278 case PIX_FMT_YUVJ444P:
279 memset (data()[0], 0, lines(0) * stride()[0]);
280 memset (data()[1], eight_bit_uv + 1, lines(1) * stride()[1]);
281 memset (data()[2], eight_bit_uv + 1, lines(2) * stride()[2]);
284 case PIX_FMT_YUV422P9LE:
285 case PIX_FMT_YUV444P9LE:
286 yuv_16_black (nine_bit_uv);
289 case PIX_FMT_YUV422P9BE:
290 case PIX_FMT_YUV444P9BE:
291 yuv_16_black (swap_16 (nine_bit_uv));
294 case PIX_FMT_YUV422P10LE:
295 case PIX_FMT_YUV444P10LE:
296 yuv_16_black (ten_bit_uv);
299 case PIX_FMT_YUV422P16LE:
300 case PIX_FMT_YUV444P16LE:
301 yuv_16_black (sixteen_bit_uv);
304 case PIX_FMT_YUV444P10BE:
305 case PIX_FMT_YUV422P10BE:
306 yuv_16_black (swap_16 (ten_bit_uv));
310 memset (data()[0], 0, lines(0) * stride()[0]);
313 case PIX_FMT_UYVY422:
315 int const Y = lines(0);
316 int const X = line_size()[0];
317 uint8_t* p = data()[0];
318 for (int y = 0; y < Y; ++y) {
319 for (int x = 0; x < X / 4; ++x) {
320 *p++ = eight_bit_uv; // Cb
322 *p++ = eight_bit_uv; // Cr
330 throw PixelFormatError (N_("make_black()"), _pixel_format);
335 Image::alpha_blend (shared_ptr<const Image> other, Position position)
337 /* Only implemented for RGBA onto RGB24 so far */
338 assert (_pixel_format == PIX_FMT_RGB24 && other->pixel_format() == PIX_FMT_RGBA);
340 int start_tx = position.x;
344 start_ox = -start_tx;
348 int start_ty = position.y;
352 start_oy = -start_ty;
356 for (int ty = start_ty, oy = start_oy; ty < size().height && oy < other->size().height; ++ty, ++oy) {
357 uint8_t* tp = data()[0] + ty * stride()[0] + position.x * 3;
358 uint8_t* op = other->data()[0] + oy * other->stride()[0];
359 for (int tx = start_tx, ox = start_ox; tx < size().width && ox < other->size().width; ++tx, ++ox) {
360 float const alpha = float (op[3]) / 255;
361 tp[0] = (tp[0] * (1 - alpha)) + op[0] * alpha;
362 tp[1] = (tp[1] * (1 - alpha)) + op[1] * alpha;
363 tp[2] = (tp[2] * (1 - alpha)) + op[2] * alpha;
371 Image::copy (shared_ptr<const Image> other, Position position)
373 /* Only implemented for RGB24 onto RGB24 so far */
374 assert (_pixel_format == PIX_FMT_RGB24 && other->pixel_format() == PIX_FMT_RGB24);
375 assert (position.x >= 0 && position.y >= 0);
377 int const N = min (position.x + other->size().width, size().width) - position.x;
378 for (int ty = position.y, oy = 0; ty < size().height && oy < other->size().height; ++ty, ++oy) {
379 uint8_t * const tp = data()[0] + ty * stride()[0] + position.x * 3;
380 uint8_t * const op = other->data()[0] + oy * other->stride()[0];
381 memcpy (tp, op, N * 3);
386 Image::read_from_socket (shared_ptr<Socket> socket)
388 for (int i = 0; i < components(); ++i) {
389 uint8_t* p = data()[i];
390 for (int y = 0; y < lines(i); ++y) {
391 socket->read (p, line_size()[i]);
398 Image::write_to_socket (shared_ptr<Socket> socket) const
400 for (int i = 0; i < components(); ++i) {
401 uint8_t* p = data()[i];
402 for (int y = 0; y < lines(i); ++y) {
403 socket->write (p, line_size()[i]);
411 Image::bytes_per_pixel (int c) const
413 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get(_pixel_format);
415 throw PixelFormatError (N_("lines()"), _pixel_format);
418 if (c >= components()) {
422 float bpp[4] = { 0, 0, 0, 0 };
424 bpp[0] = floor ((d->comp[0].depth_minus1 + 1 + 7) / 8);
425 if (d->nb_components > 1) {
426 bpp[1] = floor ((d->comp[1].depth_minus1 + 1 + 7) / 8) / pow (2.0f, d->log2_chroma_w);
428 if (d->nb_components > 2) {
429 bpp[2] = floor ((d->comp[2].depth_minus1 + 1 + 7) / 8) / pow (2.0f, d->log2_chroma_w);
431 if (d->nb_components > 3) {
432 bpp[3] = floor ((d->comp[3].depth_minus1 + 1 + 7) / 8) / pow (2.0f, d->log2_chroma_w);
435 if ((d->flags & PIX_FMT_PLANAR) == 0) {
436 /* Not planar; sum them up */
437 return bpp[0] + bpp[1] + bpp[2] + bpp[3];
443 /** Construct a SimpleImage of a given size and format, allocating memory
446 * @param p Pixel format.
447 * @param s Size in pixels.
449 SimpleImage::SimpleImage (AVPixelFormat p, libdcp::Size s, bool aligned)
458 SimpleImage::allocate ()
460 _data = (uint8_t **) av_malloc (4 * sizeof (uint8_t *));
461 _data[0] = _data[1] = _data[2] = _data[3] = 0;
463 _line_size = (int *) av_malloc (4 * sizeof (int));
464 _line_size[0] = _line_size[1] = _line_size[2] = _line_size[3] = 0;
466 _stride = (int *) av_malloc (4 * sizeof (int));
467 _stride[0] = _stride[1] = _stride[2] = _stride[3] = 0;
469 for (int i = 0; i < components(); ++i) {
470 _line_size[i] = _size.width * bytes_per_pixel(i);
471 _stride[i] = stride_round_up (i, _line_size, _aligned ? 32 : 1);
472 _data[i] = (uint8_t *) av_malloc (_stride[i] * lines (i));
476 SimpleImage::SimpleImage (SimpleImage const & other)
478 , _size (other._size)
479 , _aligned (other._aligned)
483 for (int i = 0; i < components(); ++i) {
484 uint8_t* p = _data[i];
485 uint8_t* q = other._data[i];
486 for (int j = 0; j < lines(i); ++j) {
487 memcpy (p, q, _line_size[i]);
489 q += other.stride()[i];
494 SimpleImage::SimpleImage (AVFrame* frame)
495 : Image (static_cast<AVPixelFormat> (frame->format))
496 , _size (frame->width, frame->height)
501 for (int i = 0; i < components(); ++i) {
502 uint8_t* p = _data[i];
503 uint8_t* q = frame->data[i];
504 for (int j = 0; j < lines(i); ++j) {
505 memcpy (p, q, _line_size[i]);
507 /* AVFrame's linesize is what we call `stride' */
508 q += frame->linesize[i];
513 SimpleImage::SimpleImage (shared_ptr<const Image> other, bool aligned)
514 : Image (*other.get())
515 , _size (other->size())
520 for (int i = 0; i < components(); ++i) {
521 assert(line_size()[i] == other->line_size()[i]);
522 uint8_t* p = _data[i];
523 uint8_t* q = other->data()[i];
524 for (int j = 0; j < lines(i); ++j) {
525 memcpy (p, q, line_size()[i]);
527 q += other->stride()[i];
533 SimpleImage::operator= (SimpleImage const & other)
535 if (this == &other) {
539 SimpleImage tmp (other);
545 SimpleImage::swap (SimpleImage & other)
549 std::swap (_size, other._size);
551 for (int i = 0; i < 4; ++i) {
552 std::swap (_data[i], other._data[i]);
553 std::swap (_line_size[i], other._line_size[i]);
554 std::swap (_stride[i], other._stride[i]);
557 std::swap (_aligned, other._aligned);
560 /** Destroy a SimpleImage */
561 SimpleImage::~SimpleImage ()
563 for (int i = 0; i < components(); ++i) {
568 av_free (_line_size);
573 SimpleImage::data () const
579 SimpleImage::line_size () const
585 SimpleImage::stride () const
591 SimpleImage::size () const
597 SimpleImage::aligned () const
602 RGBPlusAlphaImage::RGBPlusAlphaImage (shared_ptr<const Image> im)
603 : SimpleImage (im->pixel_format(), im->size(), false)
605 assert (im->pixel_format() == PIX_FMT_RGBA);
607 _alpha = (uint8_t *) av_malloc (im->size().width * im->size().height);
609 uint8_t* in = im->data()[0];
610 uint8_t* out = data()[0];
611 uint8_t* out_alpha = _alpha;
612 for (int y = 0; y < im->size().height; ++y) {
614 for (int x = 0; x < im->size().width; ++x) {
618 *out_alpha++ = *in_r++;
621 in += im->stride()[0];
625 RGBPlusAlphaImage::~RGBPlusAlphaImage ()