-
Notifications
You must be signed in to change notification settings - Fork 123
/
webp.cpp
634 lines (561 loc) · 18.7 KB
/
webp.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
#include "webp.hpp"
#include <opencv2/imgproc.hpp>
#include <webp/decode.h>
#include <webp/encode.h>
#include <webp/mux.h>
#include <stdbool.h>
struct webp_decoder_struct {
WebPMux* mux;
int total_frame_count;
uint32_t bgcolor;
uint32_t loop_count;
bool has_alpha;
bool has_animation;
int width;
int height;
int current_frame_index;
int prev_frame_delay_time;
int prev_frame_x_offset;
int prev_frame_y_offset;
WebPMuxAnimDispose prev_frame_dispose;
WebPMuxAnimBlend prev_frame_blend;
uint8_t* decode_buffer;
size_t decode_buffer_size;
int total_duration;
};
struct webp_encoder_struct {
// input fields
const uint8_t* icc;
size_t icc_len;
uint32_t bgcolor;
uint32_t loop_count;
// output fields
WebPMux* mux;
int frame_count;
int first_frame_delay;
int first_frame_blend;
int first_frame_dispose;
int first_frame_x_offset;
int first_frame_y_offset;
uint8_t* dst;
size_t dst_len;
};
/**
* Creates a WebP decoder from the given OpenCV matrix.
* @param buf The input OpenCV matrix containing the WebP image data.
* @return A pointer to the created webp_decoder_struct, or nullptr if creation failed.
*/
webp_decoder webp_decoder_create(const opencv_mat buf)
{
auto cvMat = static_cast<const cv::Mat*>(buf);
WebPData src = { cvMat->data, cvMat->total() };
WebPMux* mux = WebPMuxCreate(&src, 0);
if (!mux) {
return nullptr;
}
// Get features at the container level
uint32_t flags;
if (WebPMuxGetFeatures(mux, &flags) != WEBP_MUX_OK) {
WebPMuxDelete(mux);
return nullptr;
}
// Get the first frame to retrieve the image dimensions
WebPMuxFrameInfo frame;
if (WebPMuxGetFrame(mux, 1, &frame) != WEBP_MUX_OK) {
WebPMuxDelete(mux);
return nullptr;
}
WebPBitstreamFeatures features;
if (WebPGetFeatures(frame.bitstream.bytes, frame.bitstream.size, &features) != VP8_STATUS_OK) {
WebPDataClear(&frame.bitstream);
WebPMuxDelete(mux);
return nullptr;
}
WebPDataClear(&frame.bitstream);
webp_decoder d = new webp_decoder_struct();
memset(d, 0, sizeof(webp_decoder_struct));
d->mux = mux;
d->current_frame_index = 1;
d->has_alpha = (flags & ALPHA_FLAG);
// Get the canvas size
if (WebPMuxGetCanvasSize(mux, &d->width, &d->height) != WEBP_MUX_OK) {
WebPMuxDelete(mux);
return nullptr;
}
// Calculate total frame count and duration
d->total_frame_count = 0;
d->total_duration = 0;
do {
d->total_frame_count++;
d->total_duration += frame.duration;
WebPDataClear(&frame.bitstream);
} while (WebPMuxGetFrame(mux, d->total_frame_count + 1, &frame) == WEBP_MUX_OK);
// Get animation parameters
d->bgcolor = 0xFFFFFFFF; // Default to white background
if (flags & ANIMATION_FLAG) {
WebPMuxAnimParams anim_params;
if (WebPMuxGetAnimationParams(mux, &anim_params) == WEBP_MUX_OK) {
d->bgcolor = anim_params.bgcolor;
d->loop_count = anim_params.loop_count;
}
d->has_animation = true;
} else {
// For static images, ensure duration is 0
d->total_duration = 0;
}
// Pre-allocate decode buffer
d->decode_buffer_size = d->width * d->height * 4; // 4 channels for RGBA
d->decode_buffer = new uint8_t[d->decode_buffer_size];
return d;
}
/**
* Gets the width of the WebP image.
* @param d The webp_decoder_struct pointer.
* @return The width of the WebP image.
*/
int webp_decoder_get_width(const webp_decoder d)
{
return d->width;
}
/**
* Gets the height of the WebP image.
* @param d The webp_decoder_struct pointer.
* @return The height of the WebP image.
*/
int webp_decoder_get_height(const webp_decoder d)
{
return d->height;
}
/**
* Gets the pixel type of the WebP image.
* @param d The webp_decoder_struct pointer.
* @return The pixel type of the WebP image.
*/
int webp_decoder_get_pixel_type(const webp_decoder d)
{
return d->has_alpha ? CV_8UC4 : CV_8UC3;
}
/**
* Gets the delay time of the previous frame.
* @param d The webp_decoder_struct pointer.
* @return The delay time of the previous frame.
*/
int webp_decoder_get_prev_frame_delay(const webp_decoder d)
{
return d->prev_frame_delay_time;
}
/**
* Gets the x-offset of the previous frame.
* @param d The webp_decoder_struct pointer.
* @return The x-offset of the previous frame.
*/
int webp_decoder_get_prev_frame_x_offset(const webp_decoder d)
{
return d->prev_frame_x_offset;
}
/**
* Gets the y-offset of the previous frame.
* @param d The webp_decoder_struct pointer.
* @return The y-offset of the previous frame.
*/
int webp_decoder_get_prev_frame_y_offset(const webp_decoder d)
{
return d->prev_frame_y_offset;
}
/**
* Gets the dispose method of the previous frame.
* @param d The webp_decoder_struct pointer.
* @return The dispose method of the previous frame.
*/
int webp_decoder_get_prev_frame_dispose(const webp_decoder d)
{
return d->prev_frame_dispose;
}
/**
* Gets the blend method of the previous frame.
* @param d The webp_decoder_struct pointer.
* @return The blend method of the previous frame.
*/
int webp_decoder_get_prev_frame_blend(const webp_decoder d)
{
return d->prev_frame_blend;
}
/**
* Gets the background color of the WebP image.
* @param d The webp_decoder_struct pointer.
* @return The background color of the WebP image.
*/
uint32_t webp_decoder_get_bg_color(const webp_decoder d)
{
return d->bgcolor;
}
/**
* Gets the loop count of the WebP image.
* @param d The webp_decoder_struct pointer.
* @return The loop count of the WebP image.
*/
uint32_t webp_decoder_get_loop_count(const webp_decoder d)
{
return d->loop_count;
}
/**
* Gets the total number of frames in the WebP image.
* @param d The webp_decoder_struct pointer.
* @return The total number of frames in the WebP image.
*/
int webp_decoder_get_num_frames(const webp_decoder d)
{
return d ? d->total_frame_count : 0;
}
/**
* Gets the total duration of the WebP animation in milliseconds.
* @param d The webp_decoder_struct pointer.
* @return The total duration in milliseconds, 0 for static images.
*/
int webp_decoder_get_total_duration(const webp_decoder d)
{
return d ? d->total_duration : 0;
}
/**
* Gets the ICC profile data from the WebP image.
* @param d The webp_decoder_struct pointer.
* @param dst The destination buffer to store the ICC profile data.
* @param dst_len The size of the destination buffer.
* @return The size of the ICC profile data copied to the destination buffer.
*/
size_t webp_decoder_get_icc(const webp_decoder d, void* dst, size_t dst_len)
{
WebPData icc = { nullptr, 0 };
auto res = WebPMuxGetChunk(d->mux, "ICCP", &icc);
if (icc.size > 0 && res == WEBP_MUX_OK) {
if (icc.size <= dst_len) {
memcpy(dst, icc.bytes, icc.size);
return icc.size;
}
}
return 0;
}
/**
* Checks if there are more frames to decode in the WebP image.
* @param d The webp_decoder_struct pointer.
* @return True if there are more frames to decode, false otherwise.
*/
int webp_decoder_has_more_frames(webp_decoder d)
{
return d->current_frame_index < d->total_frame_count;
}
/**
* Advances to the next frame in the WebP image.
* @param d The webp_decoder_struct pointer.
*/
void webp_decoder_advance_frame(webp_decoder d)
{
d->current_frame_index++;
}
/**
* Decodes the current frame of the WebP image and stores the decoded image in the provided OpenCV matrix.
* @param d The webp_decoder_struct pointer.
* @param mat The OpenCV matrix to store the decoded image.
* @return True if the frame was successfully decoded, false otherwise.
*/
bool webp_decoder_decode(const webp_decoder d, opencv_mat mat)
{
if (!d) {
return false;
}
WebPMuxFrameInfo frame;
WebPMuxError mux_error = WebPMuxGetFrame(d->mux, d->current_frame_index, &frame);
if (mux_error != WEBP_MUX_OK) {
return false;
}
WebPBitstreamFeatures features;
if (WebPGetFeatures(frame.bitstream.bytes, frame.bitstream.size, &features) != VP8_STATUS_OK) {
WebPDataClear(&frame.bitstream);
return false;
}
// Set the cv::Mat dimensions to the frame's width and height
auto cvMat = static_cast<cv::Mat*>(mat);
cvMat->create(features.height, features.width, webp_decoder_get_pixel_type(d));
// Recalculate row size based on the new dimensions
int row_size = cvMat->cols * cvMat->elemSize();
// Store frame properties for future use
d->prev_frame_delay_time = frame.duration;
d->prev_frame_x_offset = frame.x_offset;
d->prev_frame_y_offset = frame.y_offset;
d->prev_frame_dispose = frame.dispose_method;
d->prev_frame_blend = frame.blend_method;
// Decode the frame
uint8_t* res = nullptr;
switch (webp_decoder_get_pixel_type(d)) {
case CV_8UC4:
res = WebPDecodeBGRAInto(frame.bitstream.bytes, frame.bitstream.size,
d->decode_buffer, d->decode_buffer_size, row_size);
break;
case CV_8UC3:
res = WebPDecodeBGRInto(frame.bitstream.bytes, frame.bitstream.size,
d->decode_buffer, d->decode_buffer_size, row_size);
break;
default:
return false;
}
if (res) {
memcpy(cvMat->data, d->decode_buffer, cvMat->total() * cvMat->elemSize());
}
WebPDataClear(&frame.bitstream);
return res != nullptr;
}
/**
* Releases the resources allocated for the webp_decoder_struct.
* @param d The webp_decoder_struct pointer.
*/
void webp_decoder_release(webp_decoder d)
{
if (d) {
if (d->mux) WebPMuxDelete(d->mux);
delete[] d->decode_buffer;
delete d;
}
}
/**
* Creates a WebP encoder with the given parameters.
* @param buf The output buffer to store the encoded WebP data.
* @param buf_len The size of the output buffer.
* @param icc The ICC profile data.
* @param icc_len The size of the ICC profile data.
* @param bgcolor The background color for the WebP image.
* @return A pointer to the created webp_encoder_struct, or nullptr if creation failed.
*/
webp_encoder webp_encoder_create(void* buf, size_t buf_len, const void* icc, size_t icc_len, uint32_t bgcolor, int loop_count)
{
webp_encoder e = new struct webp_encoder_struct();
memset(e, 0, sizeof(struct webp_encoder_struct));
e->dst = (uint8_t*)(buf);
e->dst_len = buf_len;
e->mux = WebPMuxNew();
e->frame_count = 1;
e->first_frame_delay = 0;
e->bgcolor = bgcolor;
e->loop_count = loop_count;
if (icc_len) {
e->icc = (const uint8_t*)(icc);
e->icc_len = icc_len;
}
return e;
}
/**
* Encodes the given OpenCV matrix as a WebP image and writes the encoded data to the output buffer.
* @param e The webp_encoder_struct pointer.
* @param src The OpenCV matrix containing the image to encode.
* @param opt The encoding options.
* @param opt_len The number of encoding options.
* @param delay The delay time for the current frame.
* @param blend The blend method for the current frame.
* @param dispose The dispose method for the current frame.
* @param x_offset The x-offset for the current frame.
* @param y_offset The y-offset for the current frame.
* @return The size of the encoded WebP data, or 0 if encoding failed.
*/
size_t webp_encoder_write(webp_encoder e, const opencv_mat src, const int* opt, size_t opt_len, int delay, int blend, int dispose, int x_offset, int y_offset)
{
if (!e || !e->mux) {
return 0;
}
// if the source is null, finalize the animation/image and return the size of the output buffer
if (!src) {
if (e->frame_count == 1) {
// No frames were added
WebPMuxDelete(e->mux);
e->mux = nullptr;
return 0;
}
// Finalize the animation/image and return the size of the output buffer
WebPData out_mux = { nullptr, 0 };
WebPMuxError mux_error = WebPMuxAssemble(e->mux, &out_mux);
if (mux_error != WEBP_MUX_OK) {
return 0;
}
if (out_mux.size == 0) {
return 0;
}
size_t copied = 0;
if (out_mux.size < e->dst_len) {
memcpy(e->dst, out_mux.bytes, out_mux.size);
copied = out_mux.size;
}
WebPDataClear(&out_mux);
WebPMuxDelete(e->mux);
e->mux = nullptr; // Ensure the mux is no longer used
return copied;
}
// Encode the source image
auto mat = static_cast<const cv::Mat*>(src);
if (!mat || mat->empty()) {
// Invalid or empty OpenCV matrix
return 0;
}
float quality = 100.0f;
for (size_t i = 0; i + 1 < opt_len; i += 2) {
if (opt[i] == CV_IMWRITE_WEBP_QUALITY) {
quality = std::max(1.0f, (float)opt[i + 1]);
}
}
if (mat->depth() != CV_8U) {
// Image depth is not 8-bit unsigned
return 0;
}
cv::Mat grayscaleConversionMat;
if (mat->channels() == 1) {
// for grayscale images, construct a temporary source
cv::cvtColor(*mat, grayscaleConversionMat, CV_GRAY2BGR);
if (grayscaleConversionMat.empty()) {
// failed to convert grayscale image to BGR
return 0;
}
mat = &grayscaleConversionMat;
}
if (mat->channels() != 3 && mat->channels() != 4) {
// Image must have 3 or 4 channels
return 0;
}
// webp will always allocate a region for the compressed image
// we will have to copy from it, then deallocate this region
size_t size = 0;
uint8_t* out_picture = nullptr;
if (quality > 100.0f) {
if (mat->channels() == 3) {
size = WebPEncodeLosslessBGR(mat->data, mat->cols, mat->rows, mat->step, &out_picture);
} else {
size = WebPEncodeLosslessBGRA(mat->data, mat->cols, mat->rows, mat->step, &out_picture);
}
} else {
if (mat->channels() == 3) {
size = WebPEncodeBGR(mat->data, mat->cols, mat->rows, mat->step, quality, &out_picture);
} else {
size = WebPEncodeBGRA(mat->data, mat->cols, mat->rows, mat->step, quality, &out_picture);
}
}
if (size == 0) {
// Failed to encode image
return 0;
}
WebPData picture = { out_picture, size };
if (e->frame_count == 1) {
// First frame handling
e->first_frame_delay = delay;
e->first_frame_blend = blend;
e->first_frame_dispose = dispose;
e->first_frame_x_offset = x_offset;
e->first_frame_y_offset = y_offset;
// Add ICC profile to the mux object
if (e->icc) {
WebPData icc_data = { e->icc, e->icc_len };
WebPMuxError mux_error = WebPMuxSetChunk(e->mux, "ICCP", &icc_data, 0);
}
WebPMuxError mux_error = WebPMuxSetImage(e->mux, &picture, 1);
if (mux_error != WEBP_MUX_OK) {
if (out_picture) {
WebPFree(out_picture);
}
return 0;
}
} else {
if (e->frame_count == 2) {
// A second frame is provided: we need to recreate the mux for animation
// Store the first frame
WebPMuxFrameInfo first_frame;
memset(&first_frame, 0, sizeof(WebPMuxFrameInfo));
WebPMuxError get_frame_error = WebPMuxGetFrame(e->mux, 1, &first_frame);
if (get_frame_error != WEBP_MUX_OK) {
if (out_picture) {
WebPFree(out_picture);
}
return 0;
}
// Delete the old single-image mux and create a new one for animation
WebPMuxDelete(e->mux);
e->mux = WebPMuxNew();
// Set the ICC profile if it exists
if (e->icc && e->icc_len > 0) {
WebPData icc_data = { e->icc, e->icc_len };
WebPMuxError mux_error = WebPMuxSetChunk(e->mux, "ICCP", &icc_data, 1);
if (mux_error != WEBP_MUX_OK) {
if (out_picture) {
WebPFree(out_picture);
}
return 0;
}
}
// Set animation parameters
WebPMuxAnimParams anim_params;
anim_params.loop_count = e->loop_count;
anim_params.bgcolor = e->bgcolor;
WebPMuxError anim_params_error = WebPMuxSetAnimationParams(e->mux, &anim_params);
if (anim_params_error != WEBP_MUX_OK) {
if (out_picture) {
WebPFree(out_picture);
}
return 0;
}
// Convert the first frame into an ANMF chunk and add it to the new mux
first_frame.id = WEBP_CHUNK_ANMF;
first_frame.duration = e->first_frame_delay;
first_frame.x_offset = e->first_frame_x_offset;
first_frame.y_offset = e->first_frame_y_offset;
first_frame.dispose_method = (WebPMuxAnimDispose)e->first_frame_dispose;
first_frame.blend_method = (WebPMuxAnimBlend)e->first_frame_blend;
WebPMuxError push_frame_error = WebPMuxPushFrame(e->mux, &first_frame, 1);
if (push_frame_error != WEBP_MUX_OK) {
if (out_picture) {
WebPFree(out_picture);
}
return 0;
}
WebPDataClear(&first_frame.bitstream);
}
// Add the current frame as an ANMF chunk
WebPMuxFrameInfo frame;
memset(&frame, 0, sizeof(WebPMuxFrameInfo));
frame.bitstream = picture;
frame.id = WEBP_CHUNK_ANMF;
frame.x_offset = x_offset;
frame.y_offset = y_offset;
frame.duration = delay;
frame.dispose_method = (WebPMuxAnimDispose)dispose;
frame.blend_method = (WebPMuxAnimBlend)blend;
// Add the frame to the mux object
WebPMuxError push_frame_error = WebPMuxPushFrame(e->mux, &frame, 1);
if (push_frame_error != WEBP_MUX_OK) {
if (out_picture) {
WebPFree(out_picture);
}
return 0;
}
}
e->frame_count++;
if (out_picture) {
WebPFree(out_picture);
}
return size;
}
/**
* Releases the resources allocated for the webp_encoder_struct.
* @param e The webp_encoder_struct pointer.
*/
void webp_encoder_release(webp_encoder e)
{
if (e) {
if (e->mux) {
WebPMuxDelete(e->mux);
}
delete e;
}
}
/**
* Flushes the remaining data in the webp_encoder_struct and finalizes the WebP image.
* @param e The webp_encoder_struct pointer.
* @return The size of the encoded WebP data, or 0 if encoding failed.
*/
size_t webp_encoder_flush(webp_encoder e)
{
return webp_encoder_write(e, nullptr, nullptr, 0, 0, 0, 0, 0, 0);
}