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>
40 #include "exceptions.h"
44 using namespace boost;
48 Image::swap (Image& other)
50 std::swap (_pixel_format, other._pixel_format);
53 /** @param n Component index.
54 * @return Number of lines in the image for the given component.
57 Image::lines (int n) const
59 switch (_pixel_format) {
64 return size().height / 2;
69 case PIX_FMT_YUV422P10LE:
79 /** @return Number of components */
81 Image::components () const
83 switch (_pixel_format) {
85 case PIX_FMT_YUV422P10LE:
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, int padding, 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 libdcp::Size content_size = out_size;
141 content_size.width -= (padding * 2);
143 shared_ptr<Image> rgb (new SimpleImage (PIX_FMT_RGB24, content_size, result_aligned));
145 struct SwsContext* scale_context = sws_getContext (
146 size().width, size().height, pixel_format(),
147 content_size.width, content_size.height, PIX_FMT_RGB24,
148 scaler->ffmpeg_id (), 0, 0, 0
151 /* Scale and convert to RGB from whatever its currently in (which may be RGB) */
156 rgb->data(), rgb->stride()
159 /* Put the image in the right place in a black frame if are padding; this is
160 a bit grubby and expensive, but probably inconsequential in the great
164 shared_ptr<Image> padded_rgb (new SimpleImage (PIX_FMT_RGB24, out_size, result_aligned));
165 padded_rgb->make_black ();
167 /* XXX: we are cheating a bit here; we know the frame is RGB so we can
168 make assumptions about its composition.
170 uint8_t* p = padded_rgb->data()[0] + padding * 3;
171 uint8_t* q = rgb->data()[0];
172 for (int j = 0; j < rgb->lines(0); ++j) {
173 memcpy (p, q, rgb->line_size()[0]);
174 p += padded_rgb->stride()[0];
175 q += rgb->stride()[0];
181 sws_freeContext (scale_context);
186 /** Run a FFmpeg post-process on this image and return the processed version.
187 * @param pp Flags for the required set of post processes.
188 * @return Post-processed image.
191 Image::post_process (string pp, bool aligned) const
193 shared_ptr<Image> out (new SimpleImage (pixel_format(), size (), aligned));
196 switch (pixel_format()) {
197 case PIX_FMT_YUV420P:
198 pp_format = PP_FORMAT_420;
200 case PIX_FMT_YUV422P10LE:
201 case PIX_FMT_YUV422P:
202 pp_format = PP_FORMAT_422;
208 pp_mode* mode = pp_get_mode_by_name_and_quality (pp.c_str (), PP_QUALITY_MAX);
209 pp_context* context = pp_get_context (size().width, size().height, pp_format | PP_CPU_CAPS_MMX2);
212 (const uint8_t **) data(), stride(),
213 out->data(), out->stride(),
214 size().width, size().height,
215 0, 0, mode, context, 0
219 pp_free_context (context);
225 Image::crop (Crop crop, bool aligned) const
227 libdcp::Size cropped_size = size ();
228 cropped_size.width -= crop.left + crop.right;
229 cropped_size.height -= crop.top + crop.bottom;
231 shared_ptr<Image> out (new SimpleImage (pixel_format(), cropped_size, aligned));
233 for (int c = 0; c < components(); ++c) {
234 int const crop_left_in_bytes = bytes_per_pixel(c) * crop.left;
235 int const cropped_width_in_bytes = bytes_per_pixel(c) * cropped_size.width;
237 /* Start of the source line, cropped from the top but not the left */
238 uint8_t* in_p = data()[c] + crop.top * stride()[c];
239 uint8_t* out_p = out->data()[c];
241 for (int y = 0; y < cropped_size.height; ++y) {
242 memcpy (out_p, in_p + crop_left_in_bytes, cropped_width_in_bytes);
243 in_p += line_size()[c];
244 out_p += out->line_size()[c];
254 switch (_pixel_format) {
255 case PIX_FMT_YUV420P:
256 case PIX_FMT_YUV422P:
257 memset (data()[0], 0, lines(0) * stride()[0]);
258 memset (data()[1], 0x7f, lines(1) * stride()[1]);
259 memset (data()[2], 0x7f, lines(2) * stride()[2]);
262 case PIX_FMT_YUV422P10LE:
263 memset (data()[0], 0, lines(0) * stride()[0]);
264 for (int i = 1; i < 3; ++i) {
265 int16_t* p = reinterpret_cast<int16_t*> (data()[i]);
266 for (int y = 0; y < size().height; ++y) {
267 for (int x = 0; x < line_size()[i] / 2; ++x) {
270 p += stride()[i] / 2;
276 memset (data()[0], 0, lines(0) * stride()[0]);
285 Image::alpha_blend (shared_ptr<const Image> other, Position position)
287 /* Only implemented for RGBA onto RGB24 so far */
288 assert (_pixel_format == PIX_FMT_RGB24 && other->pixel_format() == PIX_FMT_RGBA);
290 int start_tx = position.x;
294 start_ox = -start_tx;
298 int start_ty = position.y;
302 start_oy = -start_ty;
306 for (int ty = start_ty, oy = start_oy; ty < size().height && oy < other->size().height; ++ty, ++oy) {
307 uint8_t* tp = data()[0] + ty * stride()[0] + position.x * 3;
308 uint8_t* op = other->data()[0] + oy * other->stride()[0];
309 for (int tx = start_tx, ox = start_ox; tx < size().width && ox < other->size().width; ++tx, ++ox) {
310 float const alpha = float (op[3]) / 255;
311 tp[0] = (tp[0] * (1 - alpha)) + op[0] * alpha;
312 tp[1] = (tp[1] * (1 - alpha)) + op[1] * alpha;
313 tp[2] = (tp[2] * (1 - alpha)) + op[2] * alpha;
321 Image::read_from_socket (shared_ptr<Socket> socket)
323 for (int i = 0; i < components(); ++i) {
324 uint8_t* p = data()[i];
325 for (int y = 0; y < lines(i); ++y) {
326 socket->read_definite_and_consume (p, line_size()[i], 30);
333 Image::write_to_socket (shared_ptr<Socket> socket) const
335 for (int i = 0; i < components(); ++i) {
336 uint8_t* p = data()[i];
337 for (int y = 0; y < lines(i); ++y) {
338 socket->write (p, line_size()[i], 30);
346 Image::bytes_per_pixel (int c) const
352 switch (_pixel_format) {
365 case PIX_FMT_YUV420P:
366 case PIX_FMT_YUV422P:
372 case PIX_FMT_YUV422P10LE:
386 /** Construct a SimpleImage of a given size and format, allocating memory
389 * @param p Pixel format.
390 * @param s Size in pixels.
392 SimpleImage::SimpleImage (AVPixelFormat p, libdcp::Size s, bool aligned)
401 SimpleImage::allocate ()
403 _data = (uint8_t **) av_malloc (4 * sizeof (uint8_t *));
404 _data[0] = _data[1] = _data[2] = _data[3] = 0;
406 _line_size = (int *) av_malloc (4 * sizeof (int));
407 _line_size[0] = _line_size[1] = _line_size[2] = _line_size[3] = 0;
409 _stride = (int *) av_malloc (4 * sizeof (int));
410 _stride[0] = _stride[1] = _stride[2] = _stride[3] = 0;
412 for (int i = 0; i < components(); ++i) {
413 _line_size[i] = _size.width * bytes_per_pixel(i);
414 _stride[i] = stride_round_up (i, _line_size, _aligned ? 32 : 1);
415 _data[i] = (uint8_t *) av_malloc (_stride[i] * lines (i));
419 SimpleImage::SimpleImage (SimpleImage const & other)
423 _aligned = other._aligned;
427 for (int i = 0; i < components(); ++i) {
428 memcpy (_data[i], other._data[i], _line_size[i] * lines(i));
433 SimpleImage::operator= (SimpleImage const & other)
435 if (this == &other) {
439 SimpleImage tmp (other);
445 SimpleImage::swap (SimpleImage & other)
449 std::swap (_size, other._size);
451 for (int i = 0; i < 4; ++i) {
452 std::swap (_data[i], other._data[i]);
453 std::swap (_line_size[i], other._line_size[i]);
454 std::swap (_stride[i], other._stride[i]);
457 std::swap (_aligned, other._aligned);
460 /** Destroy a SimpleImage */
461 SimpleImage::~SimpleImage ()
463 for (int i = 0; i < components(); ++i) {
468 av_free (_line_size);
473 SimpleImage::data () const
479 SimpleImage::line_size () const
485 SimpleImage::stride () const
491 SimpleImage::size () const
497 SimpleImage::aligned () const
502 FilterBufferImage::FilterBufferImage (AVPixelFormat p, AVFilterBufferRef* b)
509 FilterBufferImage::~FilterBufferImage ()
511 avfilter_unref_buffer (_buffer);
515 FilterBufferImage::data () const
517 return _buffer->data;
521 FilterBufferImage::line_size () const
523 return _buffer->linesize;
527 FilterBufferImage::stride () const
530 return _buffer->linesize;
534 FilterBufferImage::size () const
536 return libdcp::Size (_buffer->video->w, _buffer->video->h);
540 FilterBufferImage::aligned () const
546 RGBPlusAlphaImage::RGBPlusAlphaImage (shared_ptr<const Image> im)
547 : SimpleImage (im->pixel_format(), im->size(), false)
549 assert (im->pixel_format() == PIX_FMT_RGBA);
551 _alpha = (uint8_t *) av_malloc (im->size().width * im->size().height);
553 uint8_t* in = im->data()[0];
554 uint8_t* out = data()[0];
555 uint8_t* out_alpha = _alpha;
556 for (int y = 0; y < im->size().height; ++y) {
558 for (int x = 0; x < im->size().width; ++x) {
562 *out_alpha++ = *in_r++;
565 in += im->stride()[0];
569 RGBPlusAlphaImage::~RGBPlusAlphaImage ()