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"
47 using namespace boost;
51 Image::swap (Image& other)
53 std::swap (_pixel_format, other._pixel_format);
56 /** @param n Component index.
57 * @return Number of lines in the image for the given component.
60 Image::lines (int n) const
66 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get(_pixel_format);
68 throw PixelFormatError (N_("lines()"), _pixel_format);
71 return size().height / pow(2.0f, d->log2_chroma_h);
74 /** @return Number of components */
76 Image::components () const
78 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get(_pixel_format);
80 throw PixelFormatError (N_("components()"), _pixel_format);
83 if ((d->flags & PIX_FMT_PLANAR) == 0) {
87 return d->nb_components;
91 Image::scale (libdcp::Size out_size, Scaler const * scaler, bool result_aligned) const
94 /* Empirical testing suggests that sws_scale() will crash if
95 the input image is not aligned.
99 shared_ptr<Image> scaled (new SimpleImage (pixel_format(), out_size, result_aligned));
101 struct SwsContext* scale_context = sws_getContext (
102 size().width, size().height, pixel_format(),
103 out_size.width, out_size.height, pixel_format(),
104 scaler->ffmpeg_id (), 0, 0, 0
111 scaled->data(), scaled->stride()
114 sws_freeContext (scale_context);
119 /** Scale this image to a given size and convert it to RGB.
120 * @param out_size Output image size in pixels.
121 * @param scaler Scaler to use.
124 Image::scale_and_convert_to_rgb (libdcp::Size out_size, Scaler const * scaler, bool result_aligned) const
127 /* Empirical testing suggests that sws_scale() will crash if
128 the input image is not aligned.
132 shared_ptr<Image> rgb (new SimpleImage (PIX_FMT_RGB24, out_size, result_aligned));
134 struct SwsContext* scale_context = sws_getContext (
135 size().width, size().height, pixel_format(),
136 out_size.width, out_size.height, PIX_FMT_RGB24,
137 scaler->ffmpeg_id (), 0, 0, 0
140 /* Scale and convert to RGB from whatever its currently in (which may be RGB) */
145 rgb->data(), rgb->stride()
148 sws_freeContext (scale_context);
153 /** Run a FFmpeg post-process on this image and return the processed version.
154 * @param pp Flags for the required set of post processes.
155 * @return Post-processed image.
158 Image::post_process (string pp, bool aligned) const
160 shared_ptr<Image> out (new SimpleImage (pixel_format(), size (), aligned));
163 switch (pixel_format()) {
164 case PIX_FMT_YUV420P:
165 pp_format = PP_FORMAT_420;
167 case PIX_FMT_YUV422P10LE:
168 case PIX_FMT_YUV422P:
169 case PIX_FMT_UYVY422:
170 pp_format = PP_FORMAT_422;
172 case PIX_FMT_YUV444P:
173 case PIX_FMT_YUV444P9BE:
174 case PIX_FMT_YUV444P9LE:
175 case PIX_FMT_YUV444P10BE:
176 case PIX_FMT_YUV444P10LE:
177 pp_format = PP_FORMAT_444;
179 throw PixelFormatError (N_("post_process"), pixel_format());
182 pp_mode* mode = pp_get_mode_by_name_and_quality (pp.c_str (), PP_QUALITY_MAX);
183 pp_context* context = pp_get_context (size().width, size().height, pp_format | PP_CPU_CAPS_MMX2);
186 (const uint8_t **) data(), stride(),
187 out->data(), out->stride(),
188 size().width, size().height,
189 0, 0, mode, context, 0
193 pp_free_context (context);
199 Image::crop (Crop crop, bool aligned) const
201 libdcp::Size cropped_size = size ();
202 cropped_size.width -= crop.left + crop.right;
203 cropped_size.height -= crop.top + crop.bottom;
205 shared_ptr<Image> out (new SimpleImage (pixel_format(), cropped_size, aligned));
207 for (int c = 0; c < components(); ++c) {
208 int const crop_left_in_bytes = bytes_per_pixel(c) * crop.left;
209 int const cropped_width_in_bytes = bytes_per_pixel(c) * cropped_size.width;
211 /* Start of the source line, cropped from the top but not the left */
212 uint8_t* in_p = data()[c] + crop.top * stride()[c];
213 uint8_t* out_p = out->data()[c];
215 for (int y = 0; y < out->lines(c); ++y) {
216 memcpy (out_p, in_p + crop_left_in_bytes, cropped_width_in_bytes);
218 out_p += out->stride()[c];
225 /** Blacken a YUV image whose bits per pixel is rounded up to 16 */
227 Image::yuv_16_black (uint16_t v)
229 memset (data()[0], 0, lines(0) * stride()[0]);
230 for (int i = 1; i < 3; ++i) {
231 int16_t* p = reinterpret_cast<int16_t*> (data()[i]);
232 for (int y = 0; y < size().height; ++y) {
233 for (int x = 0; x < line_size()[i] / 2; ++x) {
236 p += stride()[i] / 2;
242 Image::swap_16 (uint16_t v)
244 return ((v >> 8) & 0xff) | ((v & 0xff) << 8);
250 /* U/V black value for 8-bit colour */
251 static uint8_t const eight_bit_uv = (1 << 7) - 1;
252 /* U/V black value for 9-bit colour */
253 static uint16_t const nine_bit_uv = (1 << 8) - 1;
254 /* U/V black value for 10-bit colour */
255 static uint16_t const ten_bit_uv = (1 << 9) - 1;
256 /* U/V black value for 16-bit colour */
257 static uint16_t const sixteen_bit_uv = (1 << 15) - 1;
259 switch (_pixel_format) {
260 case PIX_FMT_YUV420P:
261 case PIX_FMT_YUV422P:
262 case PIX_FMT_YUV444P:
263 memset (data()[0], 0, lines(0) * stride()[0]);
264 memset (data()[1], eight_bit_uv, lines(1) * stride()[1]);
265 memset (data()[2], eight_bit_uv, lines(2) * stride()[2]);
268 case PIX_FMT_YUV422P9LE:
269 case PIX_FMT_YUV444P9LE:
270 yuv_16_black (nine_bit_uv);
273 case PIX_FMT_YUV422P9BE:
274 case PIX_FMT_YUV444P9BE:
275 yuv_16_black (swap_16 (nine_bit_uv));
278 case PIX_FMT_YUV422P10LE:
279 case PIX_FMT_YUV444P10LE:
280 yuv_16_black (ten_bit_uv);
283 case PIX_FMT_YUV422P16LE:
284 case PIX_FMT_YUV444P16LE:
285 yuv_16_black (sixteen_bit_uv);
288 case PIX_FMT_YUV444P10BE:
289 case PIX_FMT_YUV422P10BE:
290 yuv_16_black (swap_16 (ten_bit_uv));
294 memset (data()[0], 0, lines(0) * stride()[0]);
297 case PIX_FMT_UYVY422:
299 int const Y = lines(0);
300 int const X = line_size()[0];
301 uint8_t* p = data()[0];
302 for (int y = 0; y < Y; ++y) {
303 for (int x = 0; x < X / 4; ++x) {
304 *p++ = eight_bit_uv; // Cb
306 *p++ = eight_bit_uv; // Cr
314 throw PixelFormatError (N_("make_black()"), _pixel_format);
319 Image::alpha_blend (shared_ptr<const Image> other, Position position)
321 /* Only implemented for RGBA onto RGB24 so far */
322 assert (_pixel_format == PIX_FMT_RGB24 && other->pixel_format() == PIX_FMT_RGBA);
324 int start_tx = position.x;
328 start_ox = -start_tx;
332 int start_ty = position.y;
336 start_oy = -start_ty;
340 for (int ty = start_ty, oy = start_oy; ty < size().height && oy < other->size().height; ++ty, ++oy) {
341 uint8_t* tp = data()[0] + ty * stride()[0] + position.x * 3;
342 uint8_t* op = other->data()[0] + oy * other->stride()[0];
343 for (int tx = start_tx, ox = start_ox; tx < size().width && ox < other->size().width; ++tx, ++ox) {
344 float const alpha = float (op[3]) / 255;
345 tp[0] = (tp[0] * (1 - alpha)) + op[0] * alpha;
346 tp[1] = (tp[1] * (1 - alpha)) + op[1] * alpha;
347 tp[2] = (tp[2] * (1 - alpha)) + op[2] * alpha;
355 Image::copy (shared_ptr<const Image> other, Position position)
357 /* Only implemented for RGB24 onto RGB24 so far */
358 assert (_pixel_format == PIX_FMT_RGB24 && other->pixel_format() == PIX_FMT_RGB24);
359 assert (position.x >= 0 && position.y >= 0);
361 int const N = min (position.x + other->size().width, size().width) - position.x;
362 for (int ty = position.y, oy = 0; ty < size().height && oy < other->size().height; ++ty, ++oy) {
363 uint8_t * const tp = data()[0] + ty * stride()[0] + position.x * 3;
364 uint8_t * const op = other->data()[0] + oy * other->stride()[0];
365 memcpy (tp, op, N * 3);
370 Image::read_from_socket (shared_ptr<Socket> socket)
372 for (int i = 0; i < components(); ++i) {
373 uint8_t* p = data()[i];
374 for (int y = 0; y < lines(i); ++y) {
375 socket->read (p, line_size()[i]);
382 Image::write_to_socket (shared_ptr<Socket> socket) const
384 for (int i = 0; i < components(); ++i) {
385 uint8_t* p = data()[i];
386 for (int y = 0; y < lines(i); ++y) {
387 socket->write (p, line_size()[i]);
395 Image::bytes_per_pixel (int c) const
397 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get(_pixel_format);
399 throw PixelFormatError (N_("lines()"), _pixel_format);
402 if (c >= components()) {
406 float bpp[4] = { 0, 0, 0, 0 };
408 bpp[0] = floor ((d->comp[0].depth_minus1 + 1 + 7) / 8);
409 if (d->nb_components > 1) {
410 bpp[1] = floor ((d->comp[1].depth_minus1 + 1 + 7) / 8) / pow (2.0f, d->log2_chroma_w);
412 if (d->nb_components > 2) {
413 bpp[2] = floor ((d->comp[2].depth_minus1 + 1 + 7) / 8) / pow (2.0f, d->log2_chroma_w);
415 if (d->nb_components > 3) {
416 bpp[3] = floor ((d->comp[3].depth_minus1 + 1 + 7) / 8) / pow (2.0f, d->log2_chroma_w);
419 if ((d->flags & PIX_FMT_PLANAR) == 0) {
420 /* Not planar; sum them up */
421 return bpp[0] + bpp[1] + bpp[2] + bpp[3];
427 /** Construct a SimpleImage of a given size and format, allocating memory
430 * @param p Pixel format.
431 * @param s Size in pixels.
433 SimpleImage::SimpleImage (AVPixelFormat p, libdcp::Size s, bool aligned)
442 SimpleImage::allocate ()
444 _data = (uint8_t **) av_malloc (4 * sizeof (uint8_t *));
445 _data[0] = _data[1] = _data[2] = _data[3] = 0;
447 _line_size = (int *) av_malloc (4 * sizeof (int));
448 _line_size[0] = _line_size[1] = _line_size[2] = _line_size[3] = 0;
450 _stride = (int *) av_malloc (4 * sizeof (int));
451 _stride[0] = _stride[1] = _stride[2] = _stride[3] = 0;
453 for (int i = 0; i < components(); ++i) {
454 _line_size[i] = _size.width * bytes_per_pixel(i);
455 _stride[i] = stride_round_up (i, _line_size, _aligned ? 32 : 1);
456 _data[i] = (uint8_t *) av_malloc (_stride[i] * lines (i));
460 SimpleImage::SimpleImage (SimpleImage const & other)
462 , _size (other._size)
463 , _aligned (other._aligned)
467 for (int i = 0; i < components(); ++i) {
468 uint8_t* p = _data[i];
469 uint8_t* q = other._data[i];
470 for (int j = 0; j < lines(i); ++j) {
471 memcpy (p, q, _line_size[i]);
473 q += other.stride()[i];
478 SimpleImage::SimpleImage (AVFrame* frame)
479 : Image (static_cast<AVPixelFormat> (frame->format))
480 , _size (frame->width, frame->height)
485 for (int i = 0; i < components(); ++i) {
486 uint8_t* p = _data[i];
487 uint8_t* q = frame->data[i];
488 for (int j = 0; j < lines(i); ++j) {
489 memcpy (p, q, _line_size[i]);
491 /* AVFrame's linesize is what we call `stride' */
492 q += frame->linesize[i];
497 SimpleImage::SimpleImage (shared_ptr<const Image> other)
498 : Image (*other.get())
500 _size = other->size ();
505 for (int i = 0; i < components(); ++i) {
506 assert(line_size()[i] == other->line_size()[i]);
507 uint8_t* p = _data[i];
508 uint8_t* q = other->data()[i];
509 for (int j = 0; j < lines(i); ++j) {
510 memcpy (p, q, line_size()[i]);
512 q += other->stride()[i];
518 SimpleImage::operator= (SimpleImage const & other)
520 if (this == &other) {
524 SimpleImage tmp (other);
530 SimpleImage::swap (SimpleImage & other)
534 std::swap (_size, other._size);
536 for (int i = 0; i < 4; ++i) {
537 std::swap (_data[i], other._data[i]);
538 std::swap (_line_size[i], other._line_size[i]);
539 std::swap (_stride[i], other._stride[i]);
542 std::swap (_aligned, other._aligned);
545 /** Destroy a SimpleImage */
546 SimpleImage::~SimpleImage ()
548 for (int i = 0; i < components(); ++i) {
553 av_free (_line_size);
558 SimpleImage::data () const
564 SimpleImage::line_size () const
570 SimpleImage::stride () const
576 SimpleImage::size () const
582 SimpleImage::aligned () const
587 RGBPlusAlphaImage::RGBPlusAlphaImage (shared_ptr<const Image> im)
588 : SimpleImage (im->pixel_format(), im->size(), false)
590 assert (im->pixel_format() == PIX_FMT_RGBA);
592 _alpha = (uint8_t *) av_malloc (im->size().width * im->size().height);
594 uint8_t* in = im->data()[0];
595 uint8_t* out = data()[0];
596 uint8_t* out_alpha = _alpha;
597 for (int y = 0; y < im->size().height; ++y) {
599 for (int x = 0; x < im->size().width; ++x) {
603 *out_alpha++ = *in_r++;
606 in += im->stride()[0];
610 RGBPlusAlphaImage::~RGBPlusAlphaImage ()