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>
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;
46 /** @param n Component index.
47 * @return Number of lines in the image for the given component.
50 Image::lines (int n) const
52 switch (_pixel_format) {
57 return size().height / 2;
69 /** @return Number of components */
71 Image::components () const
73 switch (_pixel_format) {
85 /** Scale this image to a given size and convert it to RGB.
86 * @param out_size Output image size in pixels.
87 * @param scaler Scaler to use.
89 shared_ptr<RGBFrameImage>
90 Image::scale_and_convert_to_rgb (Size out_size, int padding, Scaler const * scaler) const
94 Size content_size = out_size;
95 content_size.width -= (padding * 2);
97 shared_ptr<RGBFrameImage> rgb (new RGBFrameImage (content_size));
99 struct SwsContext* scale_context = sws_getContext (
100 size().width, size().height, pixel_format(),
101 content_size.width, content_size.height, PIX_FMT_RGB24,
102 scaler->ffmpeg_id (), 0, 0, 0
105 /* Scale and convert to RGB from whatever its currently in (which may be RGB) */
110 rgb->data (), rgb->line_size ()
113 /* Put the image in the right place in a black frame if are padding; this is
114 a bit grubby and expensive, but probably inconsequential in the great
118 shared_ptr<RGBFrameImage> padded_rgb (new RGBFrameImage (out_size));
119 padded_rgb->make_black ();
121 /* XXX: we are cheating a bit here; we know the frame is RGB so we can
122 make assumptions about its composition.
124 uint8_t* p = padded_rgb->data()[0] + padding * 3;
125 uint8_t* q = rgb->data()[0];
126 for (int j = 0; j < rgb->lines(0); ++j) {
127 memcpy (p, q, rgb->line_size()[0]);
128 p += padded_rgb->line_size()[0];
129 q += rgb->line_size()[0];
135 sws_freeContext (scale_context);
140 /** Run a FFmpeg post-process on this image and return the processed version.
141 * @param pp Flags for the required set of post processes.
142 * @return Post-processed image.
144 shared_ptr<PostProcessImage>
145 Image::post_process (string pp) const
147 shared_ptr<PostProcessImage> out (new PostProcessImage (PIX_FMT_YUV420P, size ()));
149 pp_mode* mode = pp_get_mode_by_name_and_quality (pp.c_str (), PP_QUALITY_MAX);
150 pp_context* context = pp_get_context (size().width, size().height, PP_FORMAT_420 | PP_CPU_CAPS_MMX2);
153 (const uint8_t **) data(), line_size(),
154 out->data(), out->line_size(),
155 size().width, size().height,
156 0, 0, mode, context, 0
160 pp_free_context (context);
168 switch (_pixel_format) {
169 case PIX_FMT_YUV420P:
170 memset (data()[0], 0, lines(0) * line_size()[0]);
171 memset (data()[1], 0x80, lines(1) * line_size()[1]);
172 memset (data()[2], 0x80, lines(2) * line_size()[2]);
176 memset (data()[0], 0, lines(0) * line_size()[0]);
184 /** Construct a SimpleImage of a given size and format, allocating memory
187 * @param p Pixel format.
188 * @param s Size in pixels.
190 SimpleImage::SimpleImage (PixelFormat p, Size s)
194 _data = (uint8_t **) av_malloc (components() * sizeof (uint8_t *));
195 _line_size = (int *) av_malloc (components() * sizeof (int));
197 for (int i = 0; i < components(); ++i) {
203 /** Destroy a SimpleImage */
204 SimpleImage::~SimpleImage ()
206 for (int i = 0; i < components(); ++i) {
211 av_free (_line_size);
214 /** Set the size in bytes of each horizontal line of a given component.
215 * @param i Component index.
216 * @param s Size of line in bytes.
219 SimpleImage::set_line_size (int i, int s)
222 _data[i] = (uint8_t *) av_malloc (s * lines (i));
226 SimpleImage::data () const
232 SimpleImage::line_size () const
238 SimpleImage::size () const
244 FilterBufferImage::FilterBufferImage (PixelFormat p, AVFilterBufferRef* b)
251 FilterBufferImage::~FilterBufferImage ()
253 avfilter_unref_buffer (_buffer);
257 FilterBufferImage::data () const
259 return _buffer->data;
263 FilterBufferImage::line_size () const
265 return _buffer->linesize;
269 FilterBufferImage::size () const
271 return Size (_buffer->video->w, _buffer->video->h);
274 /** XXX: this could be generalised to use any format, but I don't
275 * understand how avpicture_fill is supposed to be called with
276 * multi-planar images.
278 RGBFrameImage::RGBFrameImage (Size s)
279 : Image (PIX_FMT_RGB24)
282 _frame = avcodec_alloc_frame ();
284 throw EncodeError ("could not allocate frame");
287 _data = (uint8_t *) av_malloc (size().width * size().height * 3);
288 avpicture_fill ((AVPicture *) _frame, _data, PIX_FMT_RGB24, size().width, size().height);
289 _frame->width = size().width;
290 _frame->height = size().height;
291 _frame->format = PIX_FMT_RGB24;
294 RGBFrameImage::~RGBFrameImage ()
301 RGBFrameImage::data () const
307 RGBFrameImage::line_size () const
309 return _frame->linesize;
313 RGBFrameImage::size () const
318 PostProcessImage::PostProcessImage (PixelFormat p, Size s)
322 _data = new uint8_t*[4];
323 _line_size = new int[4];
325 for (int i = 0; i < 4; ++i) {
326 _data[i] = (uint8_t *) av_malloc (s.width * s.height);
327 _line_size[i] = s.width;
331 PostProcessImage::~PostProcessImage ()
333 for (int i = 0; i < 4; ++i) {
342 PostProcessImage::data () const
348 PostProcessImage::line_size () const
354 PostProcessImage::size () const