2 Copyright (C) 2012-2014 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 class to describe a video image.
26 #include <libswscale/swscale.h>
27 #include <libavutil/pixfmt.h>
28 #include <libavutil/pixdesc.h>
31 #include "exceptions.h"
41 using boost::shared_ptr;
45 Image::line_factor (int n) const
51 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get(_pixel_format);
53 throw PixelFormatError ("lines()", _pixel_format);
56 return pow (2.0f, d->log2_chroma_h);
59 /** @param n Component index.
60 * @return Number of lines in the image for the given component.
63 Image::lines (int n) const
65 return rint (ceil (static_cast<double>(size().height) / line_factor (n)));
68 /** @return Number of components */
70 Image::components () const
72 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get(_pixel_format);
74 throw PixelFormatError ("components()", _pixel_format);
77 if ((d->flags & PIX_FMT_PLANAR) == 0) {
81 return d->nb_components;
84 /** Crop this image, scale it to `inter_size' and then place it in a black frame of `out_size' */
86 Image::crop_scale_window (Crop crop, dcp::Size inter_size, dcp::Size out_size, Scaler const * scaler, AVPixelFormat out_format, bool out_aligned) const
89 /* Empirical testing suggests that sws_scale() will crash if
90 the input image is not aligned.
94 assert (out_size.width >= inter_size.width);
95 assert (out_size.height >= inter_size.height);
97 /* Here's an image of out_size */
98 shared_ptr<Image> out (new Image (out_format, out_size, out_aligned));
101 /* Size of the image after any crop */
102 dcp::Size const cropped_size = crop.apply (size ());
104 /* Scale context for a scale from cropped_size to inter_size */
105 struct SwsContext* scale_context = sws_getContext (
106 cropped_size.width, cropped_size.height, pixel_format(),
107 inter_size.width, inter_size.height, out_format,
108 scaler->ffmpeg_id (), 0, 0, 0
111 if (!scale_context) {
112 throw StringError (N_("Could not allocate SwsContext"));
115 /* Prepare input data pointers with crop */
116 uint8_t* scale_in_data[components()];
117 for (int c = 0; c < components(); ++c) {
118 scale_in_data[c] = data()[c] + int (rint (bytes_per_pixel(c) * crop.left)) + stride()[c] * (crop.top / line_factor(c));
121 /* Corner of the image within out_size */
122 Position<int> const corner ((out_size.width - inter_size.width) / 2, (out_size.height - inter_size.height) / 2);
124 uint8_t* scale_out_data[out->components()];
125 for (int c = 0; c < out->components(); ++c) {
126 scale_out_data[c] = out->data()[c] + int (rint (out->bytes_per_pixel(c) * corner.x)) + out->stride()[c] * corner.y;
131 scale_in_data, stride(),
132 0, cropped_size.height,
133 scale_out_data, out->stride()
136 sws_freeContext (scale_context);
142 Image::scale (dcp::Size out_size, Scaler const * scaler, AVPixelFormat out_format, bool out_aligned) const
145 /* Empirical testing suggests that sws_scale() will crash if
146 the input image is not aligned.
150 shared_ptr<Image> scaled (new Image (out_format, out_size, out_aligned));
152 struct SwsContext* scale_context = sws_getContext (
153 size().width, size().height, pixel_format(),
154 out_size.width, out_size.height, out_format,
155 scaler->ffmpeg_id (), 0, 0, 0
162 scaled->data(), scaled->stride()
165 sws_freeContext (scale_context);
171 Image::crop (Crop crop, bool aligned) const
173 dcp::Size cropped_size = crop.apply (size ());
174 shared_ptr<Image> out (new Image (pixel_format(), cropped_size, aligned));
176 for (int c = 0; c < components(); ++c) {
177 int const crop_left_in_bytes = bytes_per_pixel(c) * crop.left;
178 /* bytes_per_pixel() could be a fraction; in this case the stride will be rounded
179 up, and we need to make sure that we copy over the width (up to the stride)
180 rather than short of the width; hence the ceil() here.
182 int const cropped_width_in_bytes = ceil (bytes_per_pixel(c) * cropped_size.width);
184 /* Start of the source line, cropped from the top but not the left */
185 uint8_t* in_p = data()[c] + (crop.top / out->line_factor(c)) * stride()[c];
186 uint8_t* out_p = out->data()[c];
188 for (int y = 0; y < out->lines(c); ++y) {
189 memcpy (out_p, in_p + crop_left_in_bytes, cropped_width_in_bytes);
191 out_p += out->stride()[c];
198 /** Blacken a YUV image whose bits per pixel is rounded up to 16 */
200 Image::yuv_16_black (uint16_t v, bool alpha)
202 memset (data()[0], 0, lines(0) * stride()[0]);
203 for (int i = 1; i < 3; ++i) {
204 int16_t* p = reinterpret_cast<int16_t*> (data()[i]);
205 for (int y = 0; y < lines(i); ++y) {
206 /* We divide by 2 here because we are writing 2 bytes at a time */
207 for (int x = 0; x < line_size()[i] / 2; ++x) {
210 p += stride()[i] / 2;
215 memset (data()[3], 0, lines(3) * stride()[3]);
220 Image::swap_16 (uint16_t v)
222 return ((v >> 8) & 0xff) | ((v & 0xff) << 8);
228 /* U/V black value for 8-bit colour */
229 static uint8_t const eight_bit_uv = (1 << 7) - 1;
230 /* U/V black value for 9-bit colour */
231 static uint16_t const nine_bit_uv = (1 << 8) - 1;
232 /* U/V black value for 10-bit colour */
233 static uint16_t const ten_bit_uv = (1 << 9) - 1;
234 /* U/V black value for 16-bit colour */
235 static uint16_t const sixteen_bit_uv = (1 << 15) - 1;
237 switch (_pixel_format) {
238 case PIX_FMT_YUV420P:
239 case PIX_FMT_YUV422P:
240 case PIX_FMT_YUV444P:
241 case PIX_FMT_YUV411P:
242 memset (data()[0], 0, lines(0) * stride()[0]);
243 memset (data()[1], eight_bit_uv, lines(1) * stride()[1]);
244 memset (data()[2], eight_bit_uv, lines(2) * stride()[2]);
247 case PIX_FMT_YUVJ420P:
248 case PIX_FMT_YUVJ422P:
249 case PIX_FMT_YUVJ444P:
250 memset (data()[0], 0, lines(0) * stride()[0]);
251 memset (data()[1], eight_bit_uv + 1, lines(1) * stride()[1]);
252 memset (data()[2], eight_bit_uv + 1, lines(2) * stride()[2]);
255 case PIX_FMT_YUV422P9LE:
256 case PIX_FMT_YUV444P9LE:
257 yuv_16_black (nine_bit_uv, false);
260 case PIX_FMT_YUV422P9BE:
261 case PIX_FMT_YUV444P9BE:
262 yuv_16_black (swap_16 (nine_bit_uv), false);
265 case PIX_FMT_YUV422P10LE:
266 case PIX_FMT_YUV444P10LE:
267 yuv_16_black (ten_bit_uv, false);
270 case PIX_FMT_YUV422P16LE:
271 case PIX_FMT_YUV444P16LE:
272 yuv_16_black (sixteen_bit_uv, false);
275 case PIX_FMT_YUV444P10BE:
276 case PIX_FMT_YUV422P10BE:
277 yuv_16_black (swap_16 (ten_bit_uv), false);
280 case AV_PIX_FMT_YUVA420P9BE:
281 case AV_PIX_FMT_YUVA422P9BE:
282 case AV_PIX_FMT_YUVA444P9BE:
283 yuv_16_black (swap_16 (nine_bit_uv), true);
286 case AV_PIX_FMT_YUVA420P9LE:
287 case AV_PIX_FMT_YUVA422P9LE:
288 case AV_PIX_FMT_YUVA444P9LE:
289 yuv_16_black (nine_bit_uv, true);
292 case AV_PIX_FMT_YUVA420P10BE:
293 case AV_PIX_FMT_YUVA422P10BE:
294 case AV_PIX_FMT_YUVA444P10BE:
295 yuv_16_black (swap_16 (ten_bit_uv), true);
298 case AV_PIX_FMT_YUVA420P10LE:
299 case AV_PIX_FMT_YUVA422P10LE:
300 case AV_PIX_FMT_YUVA444P10LE:
301 yuv_16_black (ten_bit_uv, true);
304 case AV_PIX_FMT_YUVA420P16BE:
305 case AV_PIX_FMT_YUVA422P16BE:
306 case AV_PIX_FMT_YUVA444P16BE:
307 yuv_16_black (swap_16 (sixteen_bit_uv), true);
310 case AV_PIX_FMT_YUVA420P16LE:
311 case AV_PIX_FMT_YUVA422P16LE:
312 case AV_PIX_FMT_YUVA444P16LE:
313 yuv_16_black (sixteen_bit_uv, true);
321 memset (data()[0], 0, lines(0) * stride()[0]);
324 case PIX_FMT_UYVY422:
326 int const Y = lines(0);
327 int const X = line_size()[0];
328 uint8_t* p = data()[0];
329 for (int y = 0; y < Y; ++y) {
330 for (int x = 0; x < X / 4; ++x) {
331 *p++ = eight_bit_uv; // Cb
333 *p++ = eight_bit_uv; // Cr
341 throw PixelFormatError ("make_black()", _pixel_format);
346 Image::alpha_blend (shared_ptr<const Image> other, Position<int> position)
351 if (_pixel_format == PIX_FMT_BGRA && other->pixel_format() == PIX_FMT_RGBA) {
354 } else if (_pixel_format == PIX_FMT_RGB24 && other->pixel_format() == PIX_FMT_RGBA) {
361 int start_tx = position.x;
365 start_ox = -start_tx;
369 int start_ty = position.y;
373 start_oy = -start_ty;
377 for (int ty = start_ty, oy = start_oy; ty < size().height && oy < other->size().height; ++ty, ++oy) {
378 uint8_t* tp = data()[0] + ty * stride()[0] + position.x * this_bpp;
379 uint8_t* op = other->data()[0] + oy * other->stride()[0];
380 for (int tx = start_tx, ox = start_ox; tx < size().width && ox < other->size().width; ++tx, ++ox) {
381 float const alpha = float (op[3]) / 255;
382 tp[0] = (tp[0] * (1 - alpha)) + op[0] * alpha;
383 tp[1] = (tp[1] * (1 - alpha)) + op[1] * alpha;
384 tp[2] = (tp[2] * (1 - alpha)) + op[2] * alpha;
392 Image::copy (shared_ptr<const Image> other, Position<int> position)
394 /* Only implemented for RGB24 onto RGB24 so far */
395 assert (_pixel_format == PIX_FMT_RGB24 && other->pixel_format() == PIX_FMT_RGB24);
396 assert (position.x >= 0 && position.y >= 0);
398 int const N = min (position.x + other->size().width, size().width) - position.x;
399 for (int ty = position.y, oy = 0; ty < size().height && oy < other->size().height; ++ty, ++oy) {
400 uint8_t * const tp = data()[0] + ty * stride()[0] + position.x * 3;
401 uint8_t * const op = other->data()[0] + oy * other->stride()[0];
402 memcpy (tp, op, N * 3);
407 Image::read_from_socket (shared_ptr<Socket> socket)
409 for (int i = 0; i < components(); ++i) {
410 uint8_t* p = data()[i];
411 for (int y = 0; y < lines(i); ++y) {
412 socket->read (p, line_size()[i]);
419 Image::write_to_socket (shared_ptr<Socket> socket) const
421 for (int i = 0; i < components(); ++i) {
422 uint8_t* p = data()[i];
423 for (int y = 0; y < lines(i); ++y) {
424 socket->write (p, line_size()[i]);
432 Image::bytes_per_pixel (int c) const
434 AVPixFmtDescriptor const * d = av_pix_fmt_desc_get(_pixel_format);
436 throw PixelFormatError ("lines()", _pixel_format);
439 if (c >= components()) {
443 float bpp[4] = { 0, 0, 0, 0 };
445 bpp[0] = floor ((d->comp[0].depth_minus1 + 1 + 7) / 8);
446 if (d->nb_components > 1) {
447 bpp[1] = floor ((d->comp[1].depth_minus1 + 1 + 7) / 8) / pow (2.0f, d->log2_chroma_w);
449 if (d->nb_components > 2) {
450 bpp[2] = floor ((d->comp[2].depth_minus1 + 1 + 7) / 8) / pow (2.0f, d->log2_chroma_w);
452 if (d->nb_components > 3) {
453 bpp[3] = floor ((d->comp[3].depth_minus1 + 1 + 7) / 8) / pow (2.0f, d->log2_chroma_w);
456 if ((d->flags & PIX_FMT_PLANAR) == 0) {
457 /* Not planar; sum them up */
458 return bpp[0] + bpp[1] + bpp[2] + bpp[3];
464 /** Construct a Image of a given size and format, allocating memory
467 * @param p Pixel format.
468 * @param s Size in pixels.
470 Image::Image (AVPixelFormat p, dcp::Size s, bool aligned)
481 _data = (uint8_t **) wrapped_av_malloc (4 * sizeof (uint8_t *));
482 _data[0] = _data[1] = _data[2] = _data[3] = 0;
484 _line_size = (int *) wrapped_av_malloc (4 * sizeof (int));
485 _line_size[0] = _line_size[1] = _line_size[2] = _line_size[3] = 0;
487 _stride = (int *) wrapped_av_malloc (4 * sizeof (int));
488 _stride[0] = _stride[1] = _stride[2] = _stride[3] = 0;
490 for (int i = 0; i < components(); ++i) {
491 _line_size[i] = ceil (_size.width * bytes_per_pixel(i));
492 _stride[i] = stride_round_up (i, _line_size, _aligned ? 32 : 1);
494 /* The assembler function ff_rgb24ToY_avx (in libswscale/x86/input.asm)
495 uses a 16-byte fetch to read three bytes (R/G/B) of image data.
496 Hence on the last pixel of the last line it reads over the end of
497 the actual data by 1 byte. If the width of an image is a multiple
498 of the stride alignment there will be no padding at the end of image lines.
499 OS X crashes on this illegal read, though other operating systems don't
500 seem to mind. The nasty + 1 in this malloc makes sure there is always a byte
501 for that instruction to read safely.
503 _data[i] = (uint8_t *) wrapped_av_malloc (_stride[i] * lines (i) + 1);
507 Image::Image (Image const & other)
509 , _pixel_format (other._pixel_format)
510 , _aligned (other._aligned)
514 for (int i = 0; i < components(); ++i) {
515 uint8_t* p = _data[i];
516 uint8_t* q = other._data[i];
517 for (int j = 0; j < lines(i); ++j) {
518 memcpy (p, q, _line_size[i]);
520 q += other.stride()[i];
525 Image::Image (AVFrame* frame)
526 : dcp::Image (dcp::Size (frame->width, frame->height))
527 , _pixel_format (static_cast<AVPixelFormat> (frame->format))
532 for (int i = 0; i < components(); ++i) {
533 uint8_t* p = _data[i];
534 uint8_t* q = frame->data[i];
535 for (int j = 0; j < lines(i); ++j) {
536 memcpy (p, q, _line_size[i]);
538 /* AVFrame's linesize is what we call `stride' */
539 q += frame->linesize[i];
544 Image::Image (shared_ptr<const Image> other, bool aligned)
546 , _pixel_format (other->_pixel_format)
551 for (int i = 0; i < components(); ++i) {
552 assert(line_size()[i] == other->line_size()[i]);
553 uint8_t* p = _data[i];
554 uint8_t* q = other->data()[i];
555 for (int j = 0; j < lines(i); ++j) {
556 memcpy (p, q, line_size()[i]);
558 q += other->stride()[i];
564 Image::operator= (Image const & other)
566 if (this == &other) {
576 Image::swap (Image & other)
578 dcp::Image::swap (other);
580 std::swap (_pixel_format, other._pixel_format);
582 for (int i = 0; i < 4; ++i) {
583 std::swap (_data[i], other._data[i]);
584 std::swap (_line_size[i], other._line_size[i]);
585 std::swap (_stride[i], other._stride[i]);
588 std::swap (_aligned, other._aligned);
591 /** Destroy a Image */
594 for (int i = 0; i < components(); ++i) {
599 av_free (_line_size);
610 Image::line_size () const
616 Image::stride () const
628 Image::aligned () const