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avformat/mpeg: demux ivtv captions
[ffmpeg.git] / libavcodec / pngenc.c
blob37e8d5bfcf88790396ac28295410c7bb27f21696
1 /*
2 * PNG image format
3 * Copyright (c) 2003 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "avcodec.h"
23 #include "codec_internal.h"
24 #include "encode.h"
25 #include "bytestream.h"
26 #include "lossless_videoencdsp.h"
27 #include "png.h"
28 #include "apng.h"
29 #include "zlib_wrapper.h"
30
31 #include "libavutil/avassert.h"
32 #include "libavutil/crc.h"
33 #include "libavutil/csp.h"
34 #include "libavutil/libm.h"
35 #include "libavutil/mastering_display_metadata.h"
36 #include "libavutil/mem.h"
37 #include "libavutil/opt.h"
38 #include "libavutil/rational.h"
39 #include "libavutil/stereo3d.h"
40
41 #include <zlib.h>
42
43 #define IOBUF_SIZE 4096
44
45 typedef struct APNGFctlChunk {
46 uint32_t sequence_number;
47 uint32_t width, height;
48 uint32_t x_offset, y_offset;
49 uint16_t delay_num, delay_den;
50 uint8_t dispose_op, blend_op;
51 } APNGFctlChunk;
52
53 typedef struct PNGEncContext {
54 AVClass *class;
55 LLVidEncDSPContext llvidencdsp;
56
57 uint8_t *bytestream;
58 uint8_t *bytestream_start;
59 uint8_t *bytestream_end;
60
61 int filter_type;
62
63 FFZStream zstream;
64 uint8_t buf[IOBUF_SIZE];
65 int dpi; ///< Physical pixel density, in dots per inch, if set
66 int dpm; ///< Physical pixel density, in dots per meter, if set
67
68 int is_progressive;
69 int bit_depth;
70 int color_type;
71 int bits_per_pixel;
72
73 // APNG
74 uint32_t palette_checksum; // Used to ensure a single unique palette
75 uint32_t sequence_number;
76 int extra_data_updated;
77 uint8_t *extra_data;
78 int extra_data_size;
79
80 AVFrame *prev_frame;
81 AVFrame *last_frame;
82 APNGFctlChunk last_frame_fctl;
83 uint8_t *last_frame_packet;
84 size_t last_frame_packet_size;
85 } PNGEncContext;
86
87 static void png_get_interlaced_row(uint8_t *dst, int row_size,
88 int bits_per_pixel, int pass,
89 const uint8_t *src, int width)
90 {
91 int x, mask, dst_x, j, b, bpp;
92 uint8_t *d;
93 const uint8_t *s;
94 static const int masks[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
95
96 mask = masks[pass];
97 switch (bits_per_pixel) {
98 case 1:
99 memset(dst, 0, row_size);
100 dst_x = 0;
101 for (x = 0; x < width; x++) {
102 j = (x & 7);
103 if ((mask << j) & 0x80) {
104 b = (src[x >> 3] >> (7 - j)) & 1;
105 dst[dst_x >> 3] |= b << (7 - (dst_x & 7));
106 dst_x++;
107 }
108 }
109 break;
110 default:
111 bpp = bits_per_pixel >> 3;
112 d = dst;
113 s = src;
114 for (x = 0; x < width; x++) {
115 j = x & 7;
116 if ((mask << j) & 0x80) {
117 memcpy(d, s, bpp);
118 d += bpp;
119 }
120 s += bpp;
121 }
122 break;
123 }
124 }
125
126 static void sub_png_paeth_prediction(uint8_t *dst, const uint8_t *src, const uint8_t *top,
127 int w, int bpp)
128 {
129 int i;
130 for (i = 0; i < w; i++) {
131 int a, b, c, p, pa, pb, pc;
132
133 a = src[i - bpp];
134 b = top[i];
135 c = top[i - bpp];
136
137 p = b - c;
138 pc = a - c;
139
140 pa = abs(p);
141 pb = abs(pc);
142 pc = abs(p + pc);
143
144 if (pa <= pb && pa <= pc)
145 p = a;
146 else if (pb <= pc)
147 p = b;
148 else
149 p = c;
150 dst[i] = src[i] - p;
151 }
152 }
153
154 static void sub_left_prediction(PNGEncContext *c, uint8_t *dst, const uint8_t *src, int bpp, int size)
155 {
156 const uint8_t *src1 = src + bpp;
157 const uint8_t *src2 = src;
158 int x, unaligned_w;
159
160 memcpy(dst, src, bpp);
161 dst += bpp;
162 size -= bpp;
163 unaligned_w = FFMIN(32 - bpp, size);
164 for (x = 0; x < unaligned_w; x++)
165 *dst++ = *src1++ - *src2++;
166 size -= unaligned_w;
167 c->llvidencdsp.diff_bytes(dst, src1, src2, size);
168 }
169
170 static void png_filter_row(PNGEncContext *c, uint8_t *dst, int filter_type,
171 const uint8_t *src, const uint8_t *top, int size, int bpp)
172 {
173 int i;
174
175 switch (filter_type) {
176 case PNG_FILTER_VALUE_NONE:
177 memcpy(dst, src, size);
178 break;
179 case PNG_FILTER_VALUE_SUB:
180 sub_left_prediction(c, dst, src, bpp, size);
181 break;
182 case PNG_FILTER_VALUE_UP:
183 c->llvidencdsp.diff_bytes(dst, src, top, size);
184 break;
185 case PNG_FILTER_VALUE_AVG:
186 for (i = 0; i < bpp; i++)
187 dst[i] = src[i] - (top[i] >> 1);
188 for (; i < size; i++)
189 dst[i] = src[i] - ((src[i - bpp] + top[i]) >> 1);
190 break;
191 case PNG_FILTER_VALUE_PAETH:
192 for (i = 0; i < bpp; i++)
193 dst[i] = src[i] - top[i];
194 sub_png_paeth_prediction(dst + i, src + i, top + i, size - i, bpp);
195 break;
196 }
197 }
198
199 static uint8_t *png_choose_filter(PNGEncContext *s, uint8_t *dst,
200 const uint8_t *src, const uint8_t *top, int size, int bpp)
201 {
202 int pred = s->filter_type;
203 av_assert0(bpp || !pred);
204 if (!top && pred)
205 pred = PNG_FILTER_VALUE_SUB;
206 if (pred == PNG_FILTER_VALUE_MIXED) {
207 int i;
208 int cost, bcost = INT_MAX;
209 uint8_t *buf1 = dst, *buf2 = dst + size + 16;
210 for (pred = 0; pred < 5; pred++) {
211 png_filter_row(s, buf1 + 1, pred, src, top, size, bpp);
212 buf1[0] = pred;
213 cost = 0;
214 for (i = 0; i <= size; i++)
215 cost += abs((int8_t) buf1[i]);
216 if (cost < bcost) {
217 bcost = cost;
218 FFSWAP(uint8_t *, buf1, buf2);
219 }
220 }
221 return buf2;
222 } else {
223 png_filter_row(s, dst + 1, pred, src, top, size, bpp);
224 dst[0] = pred;
225 return dst;
226 }
227 }
228
229 static void png_write_chunk(uint8_t **f, uint32_t tag,
230 const uint8_t *buf, int length)
231 {
232 const AVCRC *crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
233 uint32_t crc = ~0U;
234 uint8_t tagbuf[4];
235
236 bytestream_put_be32(f, length);
237 AV_WL32(tagbuf, tag);
238 crc = av_crc(crc_table, crc, tagbuf, 4);
239 bytestream_put_be32(f, av_bswap32(tag));
240 if (length > 0) {
241 crc = av_crc(crc_table, crc, buf, length);
242 if (*f != buf)
243 memcpy(*f, buf, length);
244 *f += length;
245 }
246 bytestream_put_be32(f, ~crc);
247 }
248
249 static void png_write_image_data(AVCodecContext *avctx,
250 const uint8_t *buf, int length)
251 {
252 PNGEncContext *s = avctx->priv_data;
253 const AVCRC *crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
254 uint32_t crc = ~0U;
255
256 if (avctx->codec_id == AV_CODEC_ID_PNG || avctx->frame_num == 0) {
257 png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), buf, length);
258 return;
259 }
260
261 bytestream_put_be32(&s->bytestream, length + 4);
262
263 bytestream_put_be32(&s->bytestream, MKBETAG('f', 'd', 'A', 'T'));
264 bytestream_put_be32(&s->bytestream, s->sequence_number);
265 crc = av_crc(crc_table, crc, s->bytestream - 8, 8);
266
267 crc = av_crc(crc_table, crc, buf, length);
268 memcpy(s->bytestream, buf, length);
269 s->bytestream += length;
270
271 bytestream_put_be32(&s->bytestream, ~crc);
272
273 ++s->sequence_number;
274 }
275
276 /* XXX: do filtering */
277 static int png_write_row(AVCodecContext *avctx, const uint8_t *data, int size)
278 {
279 PNGEncContext *s = avctx->priv_data;
280 z_stream *const zstream = &s->zstream.zstream;
281 int ret;
282
283 zstream->avail_in = size;
284 zstream->next_in = data;
285 while (zstream->avail_in > 0) {
286 ret = deflate(zstream, Z_NO_FLUSH);
287 if (ret != Z_OK)
288 return -1;
289 if (zstream->avail_out == 0) {
290 if (s->bytestream_end - s->bytestream > IOBUF_SIZE + 100)
291 png_write_image_data(avctx, s->buf, IOBUF_SIZE);
292 zstream->avail_out = IOBUF_SIZE;
293 zstream->next_out = s->buf;
294 }
295 }
296 return 0;
297 }
298
299 #define PNG_LRINT(d, divisor) lrint((d) * (divisor))
300 #define PNG_Q2D(q, divisor) PNG_LRINT(av_q2d(q), (divisor))
301 #define AV_WB32_PNG_D(buf, q) AV_WB32(buf, PNG_Q2D(q, 100000))
302 static int png_get_chrm(enum AVColorPrimaries prim, uint8_t *buf)
303 {
304 const AVColorPrimariesDesc *desc = av_csp_primaries_desc_from_id(prim);
305 if (!desc)
306 return 0;
307
308 AV_WB32_PNG_D(buf, desc->wp.x);
309 AV_WB32_PNG_D(buf + 4, desc->wp.y);
310 AV_WB32_PNG_D(buf + 8, desc->prim.r.x);
311 AV_WB32_PNG_D(buf + 12, desc->prim.r.y);
312 AV_WB32_PNG_D(buf + 16, desc->prim.g.x);
313 AV_WB32_PNG_D(buf + 20, desc->prim.g.y);
314 AV_WB32_PNG_D(buf + 24, desc->prim.b.x);
315 AV_WB32_PNG_D(buf + 28, desc->prim.b.y);
316
317 return 1;
318 }
319
320 static int png_get_gama(enum AVColorTransferCharacteristic trc, uint8_t *buf)
321 {
322 double gamma = av_csp_approximate_trc_gamma(trc);
323 if (gamma <= 1e-6)
324 return 0;
325
326 AV_WB32(buf, PNG_LRINT(1.0 / gamma, 100000));
327 return 1;
328 }
329
330 static int png_write_iccp(PNGEncContext *s, const AVFrameSideData *sd)
331 {
332 z_stream *const zstream = &s->zstream.zstream;
333 const AVDictionaryEntry *entry;
334 const char *name;
335 uint8_t *start, *buf;
336 int ret;
337
338 if (!sd || !sd->size)
339 return 0;
340 zstream->next_in = sd->data;
341 zstream->avail_in = sd->size;
342
343 /* write the chunk contents first */
344 start = s->bytestream + 8; /* make room for iCCP tag + length */
345 buf = start;
346
347 /* profile description */
348 entry = av_dict_get(sd->metadata, "name", NULL, 0);
349 name = (entry && entry->value[0]) ? entry->value : "icc";
350 for (int i = 0;; i++) {
351 char c = (i == 79) ? 0 : name[i];
352 bytestream_put_byte(&buf, c);
353 if (!c)
354 break;
355 }
356
357 /* compression method and profile data */
358 bytestream_put_byte(&buf, 0);
359 zstream->next_out = buf;
360 zstream->avail_out = s->bytestream_end - buf;
361 ret = deflate(zstream, Z_FINISH);
362 deflateReset(zstream);
363 if (ret != Z_STREAM_END)
364 return AVERROR_EXTERNAL;
365
366 /* rewind to the start and write the chunk header/crc */
367 png_write_chunk(&s->bytestream, MKTAG('i', 'C', 'C', 'P'), start,
368 zstream->next_out - start);
369 return 0;
370 }
371
372 static int encode_headers(AVCodecContext *avctx, const AVFrame *pict)
373 {
374 AVFrameSideData *side_data;
375 PNGEncContext *s = avctx->priv_data;
376 int ret;
377
378 /* write png header */
379 AV_WB32(s->buf, avctx->width);
380 AV_WB32(s->buf + 4, avctx->height);
381 s->buf[8] = s->bit_depth;
382 s->buf[9] = s->color_type;
383 s->buf[10] = 0; /* compression type */
384 s->buf[11] = 0; /* filter type */
385 s->buf[12] = s->is_progressive; /* interlace type */
386 png_write_chunk(&s->bytestream, MKTAG('I', 'H', 'D', 'R'), s->buf, 13);
387
388 /* write physical information */
389 if (s->dpm) {
390 AV_WB32(s->buf, s->dpm);
391 AV_WB32(s->buf + 4, s->dpm);
392 s->buf[8] = 1; /* unit specifier is meter */
393 } else {
394 AV_WB32(s->buf, avctx->sample_aspect_ratio.num);
395 AV_WB32(s->buf + 4, avctx->sample_aspect_ratio.den);
396 s->buf[8] = 0; /* unit specifier is unknown */
397 }
398 png_write_chunk(&s->bytestream, MKTAG('p', 'H', 'Y', 's'), s->buf, 9);
399
400 /* write stereoscopic information */
401 side_data = av_frame_get_side_data(pict, AV_FRAME_DATA_STEREO3D);
402 if (side_data) {
403 AVStereo3D *stereo3d = (AVStereo3D *)side_data->data;
404 switch (stereo3d->type) {
405 case AV_STEREO3D_SIDEBYSIDE:
406 s->buf[0] = ((stereo3d->flags & AV_STEREO3D_FLAG_INVERT) == 0) ? 1 : 0;
407 png_write_chunk(&s->bytestream, MKTAG('s', 'T', 'E', 'R'), s->buf, 1);
408 break;
409 case AV_STEREO3D_2D:
410 break;
411 default:
412 av_log(avctx, AV_LOG_WARNING, "Only side-by-side stereo3d flag can be defined within sTER chunk\n");
413 break;
414 }
415 }
416
417 side_data = av_frame_get_side_data(pict, AV_FRAME_DATA_ICC_PROFILE);
418 if ((ret = png_write_iccp(s, side_data)))
419 return ret;
420
421 /* write colorspace information */
422 if (pict->color_primaries == AVCOL_PRI_BT709 &&
423 pict->color_trc == AVCOL_TRC_IEC61966_2_1) {
424 s->buf[0] = 1; /* rendering intent, relative colorimetric by default */
425 png_write_chunk(&s->bytestream, MKTAG('s', 'R', 'G', 'B'), s->buf, 1);
426 } else if (pict->color_trc != AVCOL_TRC_UNSPECIFIED && !side_data) {
427 /*
428 * Avoid writing cICP if the transfer is unknown. Known primaries
429 * with unknown transfer can be handled by cHRM.
430 *
431 * We also avoid writing cICP if an ICC Profile is present, because
432 * the standard requires that cICP overrides iCCP.
433 *
434 * These values match H.273 so no translation is needed.
435 */
436 s->buf[0] = pict->color_primaries;
437 s->buf[1] = pict->color_trc;
438 s->buf[2] = 0; /* colorspace = RGB */
439 s->buf[3] = pict->color_range == AVCOL_RANGE_MPEG ? 0 : 1;
440 png_write_chunk(&s->bytestream, MKTAG('c', 'I', 'C', 'P'), s->buf, 4);
441 }
442
443 side_data = av_frame_get_side_data(pict, AV_FRAME_DATA_CONTENT_LIGHT_LEVEL);
444 if (side_data) {
445 AVContentLightMetadata *clli = (AVContentLightMetadata *) side_data->data;
446 AV_WB32(s->buf, clli->MaxCLL * 10000);
447 AV_WB32(s->buf + 4, clli->MaxFALL * 10000);
448 png_write_chunk(&s->bytestream, MKTAG('c', 'L', 'L', 'I'), s->buf, 8);
449 }
450
451 side_data = av_frame_get_side_data(pict, AV_FRAME_DATA_MASTERING_DISPLAY_METADATA);
452 if (side_data) {
453 AVMasteringDisplayMetadata *mdcv = (AVMasteringDisplayMetadata *) side_data->data;
454 if (mdcv->has_luminance && mdcv->has_primaries) {
455 for (int i = 0; i < 3; i++) {
456 AV_WB16(s->buf + 2*i, PNG_Q2D(mdcv->display_primaries[i][0], 50000));
457 AV_WB16(s->buf + 2*i + 2, PNG_Q2D(mdcv->display_primaries[i][1], 50000));
458 }
459 AV_WB16(s->buf + 12, PNG_Q2D(mdcv->white_point[0], 50000));
460 AV_WB16(s->buf + 14, PNG_Q2D(mdcv->white_point[1], 50000));
461 AV_WB32(s->buf + 16, PNG_Q2D(mdcv->max_luminance, 10000));
462 AV_WB32(s->buf + 20, PNG_Q2D(mdcv->min_luminance, 10000));
463 png_write_chunk(&s->bytestream, MKTAG('m', 'D', 'C', 'V'), s->buf, 24);
464 }
465 }
466
467 if (png_get_chrm(pict->color_primaries, s->buf))
468 png_write_chunk(&s->bytestream, MKTAG('c', 'H', 'R', 'M'), s->buf, 32);
469 if (png_get_gama(pict->color_trc, s->buf))
470 png_write_chunk(&s->bytestream, MKTAG('g', 'A', 'M', 'A'), s->buf, 4);
471
472 if (avctx->bits_per_raw_sample > 0 &&
473 avctx->bits_per_raw_sample < (s->color_type & PNG_COLOR_MASK_PALETTE ? 8 : s->bit_depth)) {
474 int len = s->color_type & PNG_COLOR_MASK_PALETTE ? 3 : ff_png_get_nb_channels(s->color_type);
475 memset(s->buf, avctx->bits_per_raw_sample, len);
476 png_write_chunk(&s->bytestream, MKTAG('s', 'B', 'I', 'T'), s->buf, len);
477 }
478
479 /* put the palette if needed, must be after colorspace information */
480 if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
481 int has_alpha, alpha, i;
482 unsigned int v;
483 uint32_t *palette;
484 uint8_t *ptr, *alpha_ptr;
485
486 palette = (uint32_t *)pict->data[1];
487 ptr = s->buf;
488 alpha_ptr = s->buf + 256 * 3;
489 has_alpha = 0;
490 for (i = 0; i < 256; i++) {
491 v = palette[i];
492 alpha = v >> 24;
493 if (alpha != 0xff)
494 has_alpha = 1;
495 *alpha_ptr++ = alpha;
496 bytestream_put_be24(&ptr, v);
497 }
498 png_write_chunk(&s->bytestream,
499 MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3);
500 if (has_alpha) {
501 png_write_chunk(&s->bytestream,
502 MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256);
503 }
504 }
505
506 return 0;
507 }
508
509 static int encode_frame(AVCodecContext *avctx, const AVFrame *pict)
510 {
511 PNGEncContext *s = avctx->priv_data;
512 z_stream *const zstream = &s->zstream.zstream;
513 const AVFrame *const p = pict;
514 int y, len, ret;
515 int row_size, pass_row_size;
516 uint8_t *crow_buf, *crow;
517 uint8_t *crow_base = NULL;
518 uint8_t *progressive_buf = NULL;
519 uint8_t *top_buf = NULL;
520
521 row_size = (pict->width * s->bits_per_pixel + 7) >> 3;
522
523 crow_base = av_malloc((row_size + 32) << (s->filter_type == PNG_FILTER_VALUE_MIXED));
524 if (!crow_base) {
525 ret = AVERROR(ENOMEM);
526 goto the_end;
527 }
528 // pixel data should be aligned, but there's a control byte before it
529 crow_buf = crow_base + 15;
530 if (s->is_progressive) {
531 progressive_buf = av_malloc(row_size + 1);
532 top_buf = av_malloc(row_size + 1);
533 if (!progressive_buf || !top_buf) {
534 ret = AVERROR(ENOMEM);
535 goto the_end;
536 }
537 }
538
539 /* put each row */
540 zstream->avail_out = IOBUF_SIZE;
541 zstream->next_out = s->buf;
542 if (s->is_progressive) {
543 int pass;
544
545 for (pass = 0; pass < NB_PASSES; pass++) {
546 /* NOTE: a pass is completely omitted if no pixels would be
547 * output */
548 pass_row_size = ff_png_pass_row_size(pass, s->bits_per_pixel, pict->width);
549 if (pass_row_size > 0) {
550 uint8_t *top = NULL;
551 for (y = 0; y < pict->height; y++)
552 if ((ff_png_pass_ymask[pass] << (y & 7)) & 0x80) {
553 const uint8_t *ptr = p->data[0] + y * p->linesize[0];
554 FFSWAP(uint8_t *, progressive_buf, top_buf);
555 png_get_interlaced_row(progressive_buf, pass_row_size,
556 s->bits_per_pixel, pass,
557 ptr, pict->width);
558 crow = png_choose_filter(s, crow_buf, progressive_buf,
559 top, pass_row_size, s->bits_per_pixel >> 3);
560 png_write_row(avctx, crow, pass_row_size + 1);
561 top = progressive_buf;
562 }
563 }
564 }
565 } else {
566 const uint8_t *top = NULL;
567 for (y = 0; y < pict->height; y++) {
568 const uint8_t *ptr = p->data[0] + y * p->linesize[0];
569 crow = png_choose_filter(s, crow_buf, ptr, top,
570 row_size, s->bits_per_pixel >> 3);
571 png_write_row(avctx, crow, row_size + 1);
572 top = ptr;
573 }
574 }
575 /* compress last bytes */
576 for (;;) {
577 ret = deflate(zstream, Z_FINISH);
578 if (ret == Z_OK || ret == Z_STREAM_END) {
579 len = IOBUF_SIZE - zstream->avail_out;
580 if (len > 0 && s->bytestream_end - s->bytestream > len + 100) {
581 png_write_image_data(avctx, s->buf, len);
582 }
583 zstream->avail_out = IOBUF_SIZE;
584 zstream->next_out = s->buf;
585 if (ret == Z_STREAM_END)
586 break;
587 } else {
588 ret = -1;
589 goto the_end;
590 }
591 }
592
593 ret = 0;
594
595 the_end:
596 av_freep(&crow_base);
597 av_freep(&progressive_buf);
598 av_freep(&top_buf);
599 deflateReset(zstream);
600 return ret;
601 }
602
603 static int add_icc_profile_size(AVCodecContext *avctx, const AVFrame *pict,
604 uint64_t *max_packet_size)
605 {
606 PNGEncContext *s = avctx->priv_data;
607 const AVFrameSideData *sd;
608 const int hdr_size = 128;
609 uint64_t new_pkt_size;
610 uLong bound;
611
612 if (!pict)
613 return 0;
614 sd = av_frame_get_side_data(pict, AV_FRAME_DATA_ICC_PROFILE);
615 if (!sd || !sd->size)
616 return 0;
617 if (sd->size != (uLong) sd->size)
618 return AVERROR_INVALIDDATA;
619
620 bound = deflateBound(&s->zstream.zstream, sd->size);
621 if (bound > INT32_MAX - hdr_size)
622 return AVERROR_INVALIDDATA;
623
624 new_pkt_size = *max_packet_size + bound + hdr_size;
625 if (new_pkt_size < *max_packet_size)
626 return AVERROR_INVALIDDATA;
627 *max_packet_size = new_pkt_size;
628 return 0;
629 }
630
631 static int encode_png(AVCodecContext *avctx, AVPacket *pkt,
632 const AVFrame *pict, int *got_packet)
633 {
634 PNGEncContext *s = avctx->priv_data;
635 int ret;
636 int enc_row_size;
637 uint64_t max_packet_size;
638
639 enc_row_size = deflateBound(&s->zstream.zstream,
640 (avctx->width * s->bits_per_pixel + 7) >> 3);
641 max_packet_size =
642 FF_INPUT_BUFFER_MIN_SIZE + // headers
643 avctx->height * (
644 enc_row_size +
645 12 * (((int64_t)enc_row_size + IOBUF_SIZE - 1) / IOBUF_SIZE) // IDAT * ceil(enc_row_size / IOBUF_SIZE)
646 );
647 if ((ret = add_icc_profile_size(avctx, pict, &max_packet_size)))
648 return ret;
649 ret = ff_alloc_packet(avctx, pkt, max_packet_size);
650 if (ret < 0)
651 return ret;
652
653 s->bytestream_start =
654 s->bytestream = pkt->data;
655 s->bytestream_end = pkt->data + pkt->size;
656
657 AV_WB64(s->bytestream, PNGSIG);
658 s->bytestream += 8;
659
660 ret = encode_headers(avctx, pict);
661 if (ret < 0)
662 return ret;
663
664 ret = encode_frame(avctx, pict);
665 if (ret < 0)
666 return ret;
667
668 png_write_chunk(&s->bytestream, MKTAG('I', 'E', 'N', 'D'), NULL, 0);
669
670 pkt->size = s->bytestream - s->bytestream_start;
671 pkt->flags |= AV_PKT_FLAG_KEY;
672 *got_packet = 1;
673
674 return 0;
675 }
676
677 static int apng_do_inverse_blend(AVFrame *output, const AVFrame *input,
678 APNGFctlChunk *fctl_chunk, uint8_t bpp)
679 {
680 // output: background, input: foreground
681 // output the image such that when blended with the background, will produce the foreground
682
683 unsigned int x, y;
684 unsigned int leftmost_x = input->width;
685 unsigned int rightmost_x = 0;
686 unsigned int topmost_y = input->height;
687 unsigned int bottommost_y = 0;
688 const uint8_t *input_data = input->data[0];
689 uint8_t *output_data = output->data[0];
690 ptrdiff_t input_linesize = input->linesize[0];
691 ptrdiff_t output_linesize = output->linesize[0];
692
693 // Find bounding box of changes
694 for (y = 0; y < input->height; ++y) {
695 for (x = 0; x < input->width; ++x) {
696 if (!memcmp(input_data + bpp * x, output_data + bpp * x, bpp))
697 continue;
698
699 if (x < leftmost_x)
700 leftmost_x = x;
701 if (x >= rightmost_x)
702 rightmost_x = x + 1;
703 if (y < topmost_y)
704 topmost_y = y;
705 if (y >= bottommost_y)
706 bottommost_y = y + 1;
707 }
708
709 input_data += input_linesize;
710 output_data += output_linesize;
711 }
712
713 if (leftmost_x == input->width && rightmost_x == 0) {
714 // Empty frame
715 // APNG does not support empty frames, so we make it a 1x1 frame
716 leftmost_x = topmost_y = 0;
717 rightmost_x = bottommost_y = 1;
718 }
719
720 // Do actual inverse blending
721 if (fctl_chunk->blend_op == APNG_BLEND_OP_SOURCE) {
722 output_data = output->data[0];
723 for (y = topmost_y; y < bottommost_y; ++y) {
724 memcpy(output_data,
725 input->data[0] + input_linesize * y + bpp * leftmost_x,
726 bpp * (rightmost_x - leftmost_x));
727 output_data += output_linesize;
728 }
729 } else { // APNG_BLEND_OP_OVER
730 size_t transparent_palette_index;
731 uint32_t *palette;
732
733 switch (input->format) {
734 case AV_PIX_FMT_RGBA64BE:
735 case AV_PIX_FMT_YA16BE:
736 case AV_PIX_FMT_RGBA:
737 case AV_PIX_FMT_GRAY8A:
738 break;
739
740 case AV_PIX_FMT_PAL8:
741 palette = (uint32_t*)input->data[1];
742 for (transparent_palette_index = 0; transparent_palette_index < 256; ++transparent_palette_index)
743 if (palette[transparent_palette_index] >> 24 == 0)
744 break;
745 break;
746
747 default:
748 // No alpha, so blending not possible
749 return -1;
750 }
751
752 for (y = topmost_y; y < bottommost_y; ++y) {
753 const uint8_t *foreground = input->data[0] + input_linesize * y + bpp * leftmost_x;
754 uint8_t *background = output->data[0] + output_linesize * y + bpp * leftmost_x;
755 output_data = output->data[0] + output_linesize * (y - topmost_y);
756 for (x = leftmost_x; x < rightmost_x; ++x, foreground += bpp, background += bpp, output_data += bpp) {
757 if (!memcmp(foreground, background, bpp)) {
758 if (input->format == AV_PIX_FMT_PAL8) {
759 if (transparent_palette_index == 256) {
760 // Need fully transparent colour, but none exists
761 return -1;
762 }
763
764 *output_data = transparent_palette_index;
765 } else {
766 memset(output_data, 0, bpp);
767 }
768 continue;
769 }
770
771 // Check for special alpha values, since full inverse
772 // alpha-on-alpha blending is rarely possible, and when
773 // possible, doesn't compress much better than
774 // APNG_BLEND_OP_SOURCE blending
775 switch (input->format) {
776 case AV_PIX_FMT_RGBA64BE:
777 if (((uint16_t*)foreground)[3] == 0xffff ||
778 ((uint16_t*)background)[3] == 0)
779 break;
780 return -1;
781
782 case AV_PIX_FMT_YA16BE:
783 if (((uint16_t*)foreground)[1] == 0xffff ||
784 ((uint16_t*)background)[1] == 0)
785 break;
786 return -1;
787
788 case AV_PIX_FMT_RGBA:
789 if (foreground[3] == 0xff || background[3] == 0)
790 break;
791 return -1;
792
793 case AV_PIX_FMT_GRAY8A:
794 if (foreground[1] == 0xff || background[1] == 0)
795 break;
796 return -1;
797
798 case AV_PIX_FMT_PAL8:
799 if (palette[*foreground] >> 24 == 0xff ||
800 palette[*background] >> 24 == 0)
801 break;
802 return -1;
803 }
804
805 memmove(output_data, foreground, bpp);
806 }
807 }
808 }
809
810 output->width = rightmost_x - leftmost_x;
811 output->height = bottommost_y - topmost_y;
812 fctl_chunk->width = output->width;
813 fctl_chunk->height = output->height;
814 fctl_chunk->x_offset = leftmost_x;
815 fctl_chunk->y_offset = topmost_y;
816
817 return 0;
818 }
819
820 static int apng_encode_frame(AVCodecContext *avctx, const AVFrame *pict,
821 APNGFctlChunk *best_fctl_chunk, APNGFctlChunk *best_last_fctl_chunk)
822 {
823 PNGEncContext *s = avctx->priv_data;
824 int ret;
825 unsigned int y;
826 AVFrame* diffFrame;
827 uint8_t bpp = (s->bits_per_pixel + 7) >> 3;
828 uint8_t *original_bytestream, *original_bytestream_end;
829 uint8_t *temp_bytestream = 0, *temp_bytestream_end;
830 uint32_t best_sequence_number;
831 uint8_t *best_bytestream;
832 size_t best_bytestream_size = SIZE_MAX;
833 APNGFctlChunk last_fctl_chunk = *best_last_fctl_chunk;
834 APNGFctlChunk fctl_chunk = *best_fctl_chunk;
835
836 if (avctx->frame_num == 0) {
837 best_fctl_chunk->width = pict->width;
838 best_fctl_chunk->height = pict->height;
839 best_fctl_chunk->x_offset = 0;
840 best_fctl_chunk->y_offset = 0;
841 best_fctl_chunk->blend_op = APNG_BLEND_OP_SOURCE;
842 return encode_frame(avctx, pict);
843 }
844
845 diffFrame = av_frame_alloc();
846 if (!diffFrame)
847 return AVERROR(ENOMEM);
848
849 diffFrame->format = pict->format;
850 diffFrame->width = pict->width;
851 diffFrame->height = pict->height;
852 if ((ret = av_frame_get_buffer(diffFrame, 0)) < 0)
853 goto fail;
854
855 original_bytestream = s->bytestream;
856 original_bytestream_end = s->bytestream_end;
857
858 temp_bytestream = av_malloc(original_bytestream_end - original_bytestream);
859 if (!temp_bytestream) {
860 ret = AVERROR(ENOMEM);
861 goto fail;
862 }
863 temp_bytestream_end = temp_bytestream + (original_bytestream_end - original_bytestream);
864
865 for (last_fctl_chunk.dispose_op = 0; last_fctl_chunk.dispose_op < 3; ++last_fctl_chunk.dispose_op) {
866 // 0: APNG_DISPOSE_OP_NONE
867 // 1: APNG_DISPOSE_OP_BACKGROUND
868 // 2: APNG_DISPOSE_OP_PREVIOUS
869
870 for (fctl_chunk.blend_op = 0; fctl_chunk.blend_op < 2; ++fctl_chunk.blend_op) {
871 // 0: APNG_BLEND_OP_SOURCE
872 // 1: APNG_BLEND_OP_OVER
873
874 uint32_t original_sequence_number = s->sequence_number, sequence_number;
875 uint8_t *bytestream_start = s->bytestream;
876 size_t bytestream_size;
877
878 // Do disposal
879 if (last_fctl_chunk.dispose_op != APNG_DISPOSE_OP_PREVIOUS) {
880 diffFrame->width = pict->width;
881 diffFrame->height = pict->height;
882 ret = av_frame_copy(diffFrame, s->last_frame);
883 if (ret < 0)
884 goto fail;
885
886 if (last_fctl_chunk.dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
887 for (y = last_fctl_chunk.y_offset; y < last_fctl_chunk.y_offset + last_fctl_chunk.height; ++y) {
888 size_t row_start = diffFrame->linesize[0] * y + bpp * last_fctl_chunk.x_offset;
889 memset(diffFrame->data[0] + row_start, 0, bpp * last_fctl_chunk.width);
890 }
891 }
892 } else {
893 if (!s->prev_frame)
894 continue;
895
896 diffFrame->width = pict->width;
897 diffFrame->height = pict->height;
898 ret = av_frame_copy(diffFrame, s->prev_frame);
899 if (ret < 0)
900 goto fail;
901 }
902
903 // Do inverse blending
904 if (apng_do_inverse_blend(diffFrame, pict, &fctl_chunk, bpp) < 0)
905 continue;
906
907 // Do encoding
908 ret = encode_frame(avctx, diffFrame);
909 sequence_number = s->sequence_number;
910 s->sequence_number = original_sequence_number;
911 bytestream_size = s->bytestream - bytestream_start;
912 s->bytestream = bytestream_start;
913 if (ret < 0)
914 goto fail;
915
916 if (bytestream_size < best_bytestream_size) {
917 *best_fctl_chunk = fctl_chunk;
918 *best_last_fctl_chunk = last_fctl_chunk;
919
920 best_sequence_number = sequence_number;
921 best_bytestream = s->bytestream;
922 best_bytestream_size = bytestream_size;
923
924 if (best_bytestream == original_bytestream) {
925 s->bytestream = temp_bytestream;
926 s->bytestream_end = temp_bytestream_end;
927 } else {
928 s->bytestream = original_bytestream;
929 s->bytestream_end = original_bytestream_end;
930 }
931 }
932 }
933 }
934
935 s->sequence_number = best_sequence_number;
936 s->bytestream = original_bytestream + best_bytestream_size;
937 s->bytestream_end = original_bytestream_end;
938 if (best_bytestream != original_bytestream)
939 memcpy(original_bytestream, best_bytestream, best_bytestream_size);
940
941 ret = 0;
942
943 fail:
944 av_freep(&temp_bytestream);
945 av_frame_free(&diffFrame);
946 return ret;
947 }
948
949 static int encode_apng(AVCodecContext *avctx, AVPacket *pkt,
950 const AVFrame *pict, int *got_packet)
951 {
952 PNGEncContext *s = avctx->priv_data;
953 int ret;
954 int enc_row_size;
955 uint64_t max_packet_size;
956 APNGFctlChunk fctl_chunk = {0};
957
958 if (pict && s->color_type == PNG_COLOR_TYPE_PALETTE) {
959 uint32_t checksum = ~av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), ~0U, pict->data[1], 256 * sizeof(uint32_t));
960
961 if (avctx->frame_num == 0) {
962 s->palette_checksum = checksum;
963 } else if (checksum != s->palette_checksum) {
964 av_log(avctx, AV_LOG_ERROR,
965 "Input contains more than one unique palette. APNG does not support multiple palettes.\n");
966 return -1;
967 }
968 }
969
970 enc_row_size = deflateBound(&s->zstream.zstream,
971 (avctx->width * s->bits_per_pixel + 7) >> 3);
972 max_packet_size =
973 FF_INPUT_BUFFER_MIN_SIZE + // headers
974 avctx->height * (
975 enc_row_size +
976 (4 + 12) * (((int64_t)enc_row_size + IOBUF_SIZE - 1) / IOBUF_SIZE) // fdAT * ceil(enc_row_size / IOBUF_SIZE)
977 );
978 if ((ret = add_icc_profile_size(avctx, pict, &max_packet_size)))
979 return ret;
980 if (max_packet_size > INT_MAX)
981 return AVERROR(ENOMEM);
982
983 if (avctx->frame_num == 0) {
984 if (!pict)
985 return AVERROR(EINVAL);
986
987 s->bytestream = s->extra_data = av_malloc(FF_INPUT_BUFFER_MIN_SIZE);
988 if (!s->extra_data)
989 return AVERROR(ENOMEM);
990
991 ret = encode_headers(avctx, pict);
992 if (ret < 0)
993 return ret;
994
995 s->extra_data_size = s->bytestream - s->extra_data;
996
997 s->last_frame_packet = av_malloc(max_packet_size);
998 if (!s->last_frame_packet)
999 return AVERROR(ENOMEM);
1000 } else if (s->last_frame) {
1001 ret = ff_get_encode_buffer(avctx, pkt, s->last_frame_packet_size, 0);
1002 if (ret < 0)
1003 return ret;
1004
1005 memcpy(pkt->data, s->last_frame_packet, s->last_frame_packet_size);
1006 pkt->pts = s->last_frame->pts;
1007 pkt->duration = s->last_frame->duration;
1008
1009 ret = ff_encode_reordered_opaque(avctx, pkt, s->last_frame);
1010 if (ret < 0)
1011 return ret;
1012 }
1013
1014 if (pict) {
1015 s->bytestream_start =
1016 s->bytestream = s->last_frame_packet;
1017 s->bytestream_end = s->bytestream + max_packet_size;
1018
1019 // We're encoding the frame first, so we have to do a bit of shuffling around
1020 // to have the image data write to the correct place in the buffer
1021 fctl_chunk.sequence_number = s->sequence_number;
1022 ++s->sequence_number;
1023 s->bytestream += APNG_FCTL_CHUNK_SIZE + 12;
1024
1025 ret = apng_encode_frame(avctx, pict, &fctl_chunk, &s->last_frame_fctl);
1026 if (ret < 0)
1027 return ret;
1028
1029 fctl_chunk.delay_num = 0; // delay filled in during muxing
1030 fctl_chunk.delay_den = 0;
1031 } else {
1032 s->last_frame_fctl.dispose_op = APNG_DISPOSE_OP_NONE;
1033 }
1034
1035 if (s->last_frame) {
1036 uint8_t* last_fctl_chunk_start = pkt->data;
1037 uint8_t buf[APNG_FCTL_CHUNK_SIZE];
1038 if (!s->extra_data_updated) {
1039 uint8_t *side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, s->extra_data_size);
1040 if (!side_data)
1041 return AVERROR(ENOMEM);
1042 memcpy(side_data, s->extra_data, s->extra_data_size);
1043 s->extra_data_updated = 1;
1044 }
1045
1046 AV_WB32(buf + 0, s->last_frame_fctl.sequence_number);
1047 AV_WB32(buf + 4, s->last_frame_fctl.width);
1048 AV_WB32(buf + 8, s->last_frame_fctl.height);
1049 AV_WB32(buf + 12, s->last_frame_fctl.x_offset);
1050 AV_WB32(buf + 16, s->last_frame_fctl.y_offset);
1051 AV_WB16(buf + 20, s->last_frame_fctl.delay_num);
1052 AV_WB16(buf + 22, s->last_frame_fctl.delay_den);
1053 buf[24] = s->last_frame_fctl.dispose_op;
1054 buf[25] = s->last_frame_fctl.blend_op;
1055 png_write_chunk(&last_fctl_chunk_start, MKTAG('f', 'c', 'T', 'L'), buf, sizeof(buf));
1056
1057 *got_packet = 1;
1058 }
1059
1060 if (pict) {
1061 if (!s->last_frame) {
1062 s->last_frame = av_frame_alloc();
1063 if (!s->last_frame)
1064 return AVERROR(ENOMEM);
1065 } else if (s->last_frame_fctl.dispose_op != APNG_DISPOSE_OP_PREVIOUS) {
1066 if (!s->prev_frame) {
1067 s->prev_frame = av_frame_alloc();
1068 if (!s->prev_frame)
1069 return AVERROR(ENOMEM);
1070
1071 s->prev_frame->format = pict->format;
1072 s->prev_frame->width = pict->width;
1073 s->prev_frame->height = pict->height;
1074 if ((ret = av_frame_get_buffer(s->prev_frame, 0)) < 0)
1075 return ret;
1076 }
1077
1078 // Do disposal, but not blending
1079 av_frame_copy(s->prev_frame, s->last_frame);
1080 if (s->last_frame_fctl.dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
1081 uint32_t y;
1082 uint8_t bpp = (s->bits_per_pixel + 7) >> 3;
1083 for (y = s->last_frame_fctl.y_offset; y < s->last_frame_fctl.y_offset + s->last_frame_fctl.height; ++y) {
1084 size_t row_start = s->prev_frame->linesize[0] * y + bpp * s->last_frame_fctl.x_offset;
1085 memset(s->prev_frame->data[0] + row_start, 0, bpp * s->last_frame_fctl.width);
1086 }
1087 }
1088 }
1089
1090 ret = av_frame_replace(s->last_frame, pict);
1091 if (ret < 0)
1092 return ret;
1093
1094 s->last_frame_fctl = fctl_chunk;
1095 s->last_frame_packet_size = s->bytestream - s->bytestream_start;
1096 } else {
1097 av_frame_free(&s->last_frame);
1098 }
1099
1100 return 0;
1101 }
1102
1103 static av_cold int png_enc_init(AVCodecContext *avctx)
1104 {
1105 PNGEncContext *s = avctx->priv_data;
1106 int compression_level;
1107
1108 switch (avctx->pix_fmt) {
1109 case AV_PIX_FMT_RGBA:
1110 avctx->bits_per_coded_sample = 32;
1111 break;
1112 case AV_PIX_FMT_RGB24:
1113 avctx->bits_per_coded_sample = 24;
1114 break;
1115 case AV_PIX_FMT_GRAY8:
1116 avctx->bits_per_coded_sample = 0x28;
1117 break;
1118 case AV_PIX_FMT_MONOBLACK:
1119 avctx->bits_per_coded_sample = 1;
1120 break;
1121 case AV_PIX_FMT_PAL8:
1122 avctx->bits_per_coded_sample = 8;
1123 }
1124
1125 ff_llvidencdsp_init(&s->llvidencdsp);
1126
1127 if (avctx->pix_fmt == AV_PIX_FMT_MONOBLACK)
1128 s->filter_type = PNG_FILTER_VALUE_NONE;
1129
1130 if (s->dpi && s->dpm) {
1131 av_log(avctx, AV_LOG_ERROR, "Only one of 'dpi' or 'dpm' options should be set\n");
1132 return AVERROR(EINVAL);
1133 } else if (s->dpi) {
1134 s->dpm = s->dpi * 10000 / 254;
1135 }
1136
1137 s->is_progressive = !!(avctx->flags & AV_CODEC_FLAG_INTERLACED_DCT);
1138 switch (avctx->pix_fmt) {
1139 case AV_PIX_FMT_RGBA64BE:
1140 s->bit_depth = 16;
1141 s->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
1142 break;
1143 case AV_PIX_FMT_RGB48BE:
1144 s->bit_depth = 16;
1145 s->color_type = PNG_COLOR_TYPE_RGB;
1146 break;
1147 case AV_PIX_FMT_RGBA:
1148 s->bit_depth = 8;
1149 s->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
1150 break;
1151 case AV_PIX_FMT_RGB24:
1152 s->bit_depth = 8;
1153 s->color_type = PNG_COLOR_TYPE_RGB;
1154 break;
1155 case AV_PIX_FMT_GRAY16BE:
1156 s->bit_depth = 16;
1157 s->color_type = PNG_COLOR_TYPE_GRAY;
1158 break;
1159 case AV_PIX_FMT_GRAY8:
1160 s->bit_depth = 8;
1161 s->color_type = PNG_COLOR_TYPE_GRAY;
1162 break;
1163 case AV_PIX_FMT_GRAY8A:
1164 s->bit_depth = 8;
1165 s->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
1166 break;
1167 case AV_PIX_FMT_YA16BE:
1168 s->bit_depth = 16;
1169 s->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
1170 break;
1171 case AV_PIX_FMT_MONOBLACK:
1172 s->bit_depth = 1;
1173 s->color_type = PNG_COLOR_TYPE_GRAY;
1174 break;
1175 case AV_PIX_FMT_PAL8:
1176 s->bit_depth = 8;
1177 s->color_type = PNG_COLOR_TYPE_PALETTE;
1178 break;
1179 default:
1180 return -1;
1181 }
1182 s->bits_per_pixel = ff_png_get_nb_channels(s->color_type) * s->bit_depth;
1183
1184 compression_level = avctx->compression_level == FF_COMPRESSION_DEFAULT
1185 ? Z_DEFAULT_COMPRESSION
1186 : av_clip(avctx->compression_level, 0, 9);
1187 return ff_deflate_init(&s->zstream, compression_level, avctx);
1188 }
1189
1190 static av_cold int png_enc_close(AVCodecContext *avctx)
1191 {
1192 PNGEncContext *s = avctx->priv_data;
1193
1194 ff_deflate_end(&s->zstream);
1195 av_frame_free(&s->last_frame);
1196 av_frame_free(&s->prev_frame);
1197 av_freep(&s->last_frame_packet);
1198 av_freep(&s->extra_data);
1199 s->extra_data_size = 0;
1200 return 0;
1201 }
1202
1203 #define OFFSET(x) offsetof(PNGEncContext, x)
1204 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
1205 static const AVOption options[] = {
1206 {"dpi", "Set image resolution (in dots per inch)", OFFSET(dpi), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 0x10000, VE},
1207 {"dpm", "Set image resolution (in dots per meter)", OFFSET(dpm), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 0x10000, VE},
1208 { "pred", "Prediction method", OFFSET(filter_type), AV_OPT_TYPE_INT, { .i64 = PNG_FILTER_VALUE_NONE }, PNG_FILTER_VALUE_NONE, PNG_FILTER_VALUE_MIXED, VE, .unit = "pred" },
1209 { "none", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_NONE }, INT_MIN, INT_MAX, VE, .unit = "pred" },
1210 { "sub", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_SUB }, INT_MIN, INT_MAX, VE, .unit = "pred" },
1211 { "up", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_UP }, INT_MIN, INT_MAX, VE, .unit = "pred" },
1212 { "avg", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_AVG }, INT_MIN, INT_MAX, VE, .unit = "pred" },
1213 { "paeth", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_PAETH }, INT_MIN, INT_MAX, VE, .unit = "pred" },
1214 { "mixed", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_MIXED }, INT_MIN, INT_MAX, VE, .unit = "pred" },
1215 { NULL},
1216 };
1217
1218 static const AVClass pngenc_class = {
1219 .class_name = "(A)PNG encoder",
1220 .item_name = av_default_item_name,
1221 .option = options,
1222 .version = LIBAVUTIL_VERSION_INT,
1223 };
1224
1225 const FFCodec ff_png_encoder = {
1226 .p.name = "png",
1227 CODEC_LONG_NAME("PNG (Portable Network Graphics) image"),
1228 .p.type = AVMEDIA_TYPE_VIDEO,
1229 .p.id = AV_CODEC_ID_PNG,
1230 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
1231 AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
1232 .priv_data_size = sizeof(PNGEncContext),
1233 .init = png_enc_init,
1234 .close = png_enc_close,
1235 FF_CODEC_ENCODE_CB(encode_png),
1236 .p.pix_fmts = (const enum AVPixelFormat[]) {
1237 AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
1238 AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGBA64BE,
1239 AV_PIX_FMT_PAL8,
1240 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A,
1241 AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_YA16BE,
1242 AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE
1243 },
1244 .p.priv_class = &pngenc_class,
1245 .caps_internal = FF_CODEC_CAP_ICC_PROFILES,
1246 };
1247
1248 const FFCodec ff_apng_encoder = {
1249 .p.name = "apng",
1250 CODEC_LONG_NAME("APNG (Animated Portable Network Graphics) image"),
1251 .p.type = AVMEDIA_TYPE_VIDEO,
1252 .p.id = AV_CODEC_ID_APNG,
1253 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
1254 AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
1255 .priv_data_size = sizeof(PNGEncContext),
1256 .init = png_enc_init,
1257 .close = png_enc_close,
1258 FF_CODEC_ENCODE_CB(encode_apng),
1259 .p.pix_fmts = (const enum AVPixelFormat[]) {
1260 AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
1261 AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGBA64BE,
1262 AV_PIX_FMT_PAL8,
1263 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A,
1264 AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_YA16BE,
1265 AV_PIX_FMT_NONE
1266 },
1267 .p.priv_class = &pngenc_class,
1268 .caps_internal = FF_CODEC_CAP_ICC_PROFILES,
1269 };