FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/pngenc.c
Date: 2025-11-01 17:46:10
Exec Total Coverage
Lines: 516 767 67.3%
Functions: 20 21 95.2%
Branches: 192 379 50.7%
Line Branch Exec Source
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 "exif_internal.h"
26 #include "bytestream.h"
27 #include "lossless_videoencdsp.h"
28 #include "png.h"
29 #include "apng.h"
30 #include "zlib_wrapper.h"
31
32 #include "libavutil/avassert.h"
33 #include "libavutil/buffer.h"
34 #include "libavutil/crc.h"
35 #include "libavutil/csp.h"
36 #include "libavutil/libm.h"
37 #include "libavutil/mastering_display_metadata.h"
38 #include "libavutil/mem.h"
39 #include "libavutil/opt.h"
40 #include "libavutil/rational.h"
41 #include "libavutil/stereo3d.h"
42
43 #include <zlib.h>
44
45 #define IOBUF_SIZE 4096
46
47 typedef struct APNGFctlChunk {
48 uint32_t sequence_number;
49 uint32_t width, height;
50 uint32_t x_offset, y_offset;
51 uint16_t delay_num, delay_den;
52 uint8_t dispose_op, blend_op;
53 } APNGFctlChunk;
54
55 typedef struct PNGEncContext {
56 AVClass *class;
57 LLVidEncDSPContext llvidencdsp;
58
59 uint8_t *bytestream;
60 uint8_t *bytestream_start;
61 uint8_t *bytestream_end;
62
63 int filter_type;
64
65 FFZStream zstream;
66 uint8_t buf[IOBUF_SIZE];
67 int dpi; ///< Physical pixel density, in dots per inch, if set
68 int dpm; ///< Physical pixel density, in dots per meter, if set
69
70 int is_progressive;
71 int bit_depth;
72 int color_type;
73 int bits_per_pixel;
74
75 // APNG
76 uint32_t palette_checksum; // Used to ensure a single unique palette
77 uint32_t sequence_number;
78 int extra_data_updated;
79 uint8_t *extra_data;
80 int extra_data_size;
81
82 AVFrame *prev_frame;
83 AVFrame *last_frame;
84 APNGFctlChunk last_frame_fctl;
85 uint8_t *last_frame_packet;
86 size_t last_frame_packet_size;
87 } PNGEncContext;
88
89 ✗ static void png_get_interlaced_row(uint8_t *dst, int row_size,
90 int bits_per_pixel, int pass,
91 const uint8_t *src, int width)
92 {
93 int x, mask, dst_x, j, b, bpp;
94 uint8_t *d;
95 const uint8_t *s;
96 static const int masks[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
97
98 ✗ mask = masks[pass];
99 ✗ switch (bits_per_pixel) {
100 ✗ case 1:
101 ✗ memset(dst, 0, row_size);
102 ✗ dst_x = 0;
103 ✗ for (x = 0; x < width; x++) {
104 ✗ j = (x & 7);
105 ✗ if ((mask << j) & 0x80) {
106 ✗ b = (src[x >> 3] >> (7 - j)) & 1;
107 ✗ dst[dst_x >> 3] |= b << (7 - (dst_x & 7));
108 ✗ dst_x++;
109 }
110 }
111 ✗ break;
112 ✗ default:
113 ✗ bpp = bits_per_pixel >> 3;
114 ✗ d = dst;
115 ✗ s = src;
116 ✗ for (x = 0; x < width; x++) {
117 ✗ j = x & 7;
118 ✗ if ((mask << j) & 0x80) {
119 ✗ memcpy(d, s, bpp);
120 ✗ d += bpp;
121 }
122 ✗ s += bpp;
123 }
124 ✗ break;
125 }
126 ✗ }
127
128 79796 static void sub_png_paeth_prediction(uint8_t *dst, const uint8_t *src, const uint8_t *top,
129 int w, int bpp)
130 {
131 int i;
132
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 87423560 for (i = 0; i < w; i++) {
133 int a, b, c, p, pa, pb, pc;
134
135 87343764 a = src[i - bpp];
136 87343764 b = top[i];
137 87343764 c = top[i - bpp];
138
139 87343764 p = b - c;
140 87343764 pc = a - c;
141
142 87343764 pa = abs(p);
143 87343764 pb = abs(pc);
144 87343764 pc = abs(p + pc);
145
146
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 87343764 if (pa <= pb && pa <= pc)
147 43937095 p = a;
148
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 43406669 else if (pb <= pc)
149 33836991 p = b;
150 else
151 9569678 p = c;
152 87343764 dst[i] = src[i] - p;
153 }
154 79796 }
155
156 320 static void sub_left_prediction(PNGEncContext *c, uint8_t *dst, const uint8_t *src, int bpp, int size)
157 {
158 320 const uint8_t *src1 = src + bpp;
159 320 const uint8_t *src2 = src;
160 int x, unaligned_w;
161
162 320 memcpy(dst, src, bpp);
163 320 dst += bpp;
164 320 size -= bpp;
165 320 unaligned_w = FFMIN(32 - bpp, size);
166
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 9574 for (x = 0; x < unaligned_w; x++)
167 9254 *dst++ = *src1++ - *src2++;
168 320 size -= unaligned_w;
169 320 c->llvidencdsp.diff_bytes(dst, src1, src2, size);
170 320 }
171
172 80116 static void png_filter_row(PNGEncContext *c, uint8_t *dst, int filter_type,
173 const uint8_t *src, const uint8_t *top, int size, int bpp)
174 {
175 int i;
176
177
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 80116 switch (filter_type) {
178 ✗ case PNG_FILTER_VALUE_NONE:
179 ✗ memcpy(dst, src, size);
180 ✗ break;
181 320 case PNG_FILTER_VALUE_SUB:
182 320 sub_left_prediction(c, dst, src, bpp, size);
183 320 break;
184 ✗ case PNG_FILTER_VALUE_UP:
185 ✗ c->llvidencdsp.diff_bytes(dst, src, top, size);
186 ✗ break;
187 ✗ case PNG_FILTER_VALUE_AVG:
188 ✗ for (i = 0; i < bpp; i++)
189 ✗ dst[i] = src[i] - (top[i] >> 1);
190 ✗ for (; i < size; i++)
191 ✗ dst[i] = src[i] - ((src[i - bpp] + top[i]) >> 1);
192 ✗ break;
193 79796 case PNG_FILTER_VALUE_PAETH:
194
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 326646 for (i = 0; i < bpp; i++)
195 246850 dst[i] = src[i] - top[i];
196 79796 sub_png_paeth_prediction(dst + i, src + i, top + i, size - i, bpp);
197 79796 break;
198 ✗ default:
199 ✗ av_unreachable("PNG_FILTER_VALUE_MIXED can't happen here and all others are covered");
200 }
201 80116 }
202
203 80116 static uint8_t *png_choose_filter(PNGEncContext *s, uint8_t *dst,
204 const uint8_t *src, const uint8_t *top, int size, int bpp)
205 {
206 80116 int pred = s->filter_type;
207
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 80116 av_assert0(bpp || !pred);
208
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 80116 if (!top && pred)
209 320 pred = PNG_FILTER_VALUE_SUB;
210
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 80116 if (pred == PNG_FILTER_VALUE_MIXED) {
211 int i;
212 ✗ int cost, bcost = INT_MAX;
213 ✗ uint8_t *buf1 = dst, *buf2 = dst + size + 16;
214 ✗ for (pred = 0; pred < 5; pred++) {
215 ✗ png_filter_row(s, buf1 + 1, pred, src, top, size, bpp);
216 ✗ buf1[0] = pred;
217 ✗ cost = 0;
218 ✗ for (i = 0; i <= size; i++)
219 ✗ cost += abs((int8_t) buf1[i]);
220 ✗ if (cost < bcost) {
221 ✗ bcost = cost;
222 ✗ FFSWAP(uint8_t *, buf1, buf2);
223 }
224 }
225 ✗ return buf2;
226 } else {
227 80116 png_filter_row(s, dst + 1, pred, src, top, size, bpp);
228 80116 dst[0] = pred;
229 80116 return dst;
230 }
231 }
232
233 9727 static void png_write_chunk(uint8_t **f, uint32_t tag,
234 const uint8_t *buf, int length)
235 {
236 9727 const AVCRC *crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
237 9727 uint32_t crc = ~0U;
238 uint8_t tagbuf[4];
239
240 9727 bytestream_put_be32(f, length);
241 9727 AV_WL32(tagbuf, tag);
242 9727 crc = av_crc(crc_table, crc, tagbuf, 4);
243 9727 bytestream_put_be32(f, av_bswap32(tag));
244
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 9727 if (length > 0) {
245 9480 crc = av_crc(crc_table, crc, buf, length);
246
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 9480 if (*f != buf)
247 9479 memcpy(*f, buf, length);
248 9480 *f += length;
249 }
250 9727 bytestream_put_be32(f, ~crc);
251 9727 }
252
253 11692 static void png_write_image_data(AVCodecContext *avctx,
254 const uint8_t *buf, int length)
255 {
256 11692 PNGEncContext *s = avctx->priv_data;
257 11692 const AVCRC *crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
258 11692 uint32_t crc = ~0U;
259
260
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 11692 if (avctx->codec_id == AV_CODEC_ID_PNG || avctx->frame_num == 0) {
261 8947 png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), buf, length);
262 8947 return;
263 }
264
265 2745 bytestream_put_be32(&s->bytestream, length + 4);
266
267 2745 bytestream_put_be32(&s->bytestream, MKBETAG('f', 'd', 'A', 'T'));
268 2745 bytestream_put_be32(&s->bytestream, s->sequence_number);
269 2745 crc = av_crc(crc_table, crc, s->bytestream - 8, 8);
270
271 2745 crc = av_crc(crc_table, crc, buf, length);
272 2745 memcpy(s->bytestream, buf, length);
273 2745 s->bytestream += length;
274
275 2745 bytestream_put_be32(&s->bytestream, ~crc);
276
277 2745 ++s->sequence_number;
278 }
279
280 /* XXX: do filtering */
281 80116 static int png_write_row(AVCodecContext *avctx, const uint8_t *data, int size)
282 {
283 80116 PNGEncContext *s = avctx->priv_data;
284 80116 z_stream *const zstream = &s->zstream.zstream;
285 int ret;
286
287 80116 zstream->avail_in = size;
288 80116 zstream->next_in = data;
289
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 248777 while (zstream->avail_in > 0) {
290 88545 ret = deflate(zstream, Z_NO_FLUSH);
291
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 88545 if (ret != Z_OK)
292 ✗ return -1;
293
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 88545 if (zstream->avail_out == 0) {
294
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 10562 if (s->bytestream_end - s->bytestream > IOBUF_SIZE + 100)
295 10562 png_write_image_data(avctx, s->buf, IOBUF_SIZE);
296 10562 zstream->avail_out = IOBUF_SIZE;
297 10562 zstream->next_out = s->buf;
298 }
299 }
300 80116 return 0;
301 }
302
303 #define PNG_LRINT(d, divisor) lrint((d) * (divisor))
304 #define PNG_Q2D(q, divisor) PNG_LRINT(av_q2d(q), (divisor))
305 #define AV_WB32_PNG_D(buf, q) AV_WB32(buf, PNG_Q2D(q, 100000))
306 249 static int png_get_chrm(enum AVColorPrimaries prim, uint8_t *buf)
307 {
308 249 const AVColorPrimariesDesc *desc = av_csp_primaries_desc_from_id(prim);
309
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 249 if (!desc)
310 247 return 0;
311
312 2 AV_WB32_PNG_D(buf, desc->wp.x);
313 2 AV_WB32_PNG_D(buf + 4, desc->wp.y);
314 2 AV_WB32_PNG_D(buf + 8, desc->prim.r.x);
315 2 AV_WB32_PNG_D(buf + 12, desc->prim.r.y);
316 2 AV_WB32_PNG_D(buf + 16, desc->prim.g.x);
317 2 AV_WB32_PNG_D(buf + 20, desc->prim.g.y);
318 2 AV_WB32_PNG_D(buf + 24, desc->prim.b.x);
319 2 AV_WB32_PNG_D(buf + 28, desc->prim.b.y);
320
321 2 return 1;
322 }
323
324 249 static int png_get_gama(enum AVColorTransferCharacteristic trc, uint8_t *buf)
325 {
326 249 double gamma = av_csp_approximate_eotf_gamma(trc);
327
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 249 if (gamma <= 1e-6)
328 249 return 0;
329
330 ✗ AV_WB32(buf, PNG_LRINT(1.0 / gamma, 100000));
331 ✗ return 1;
332 }
333
334 249 static int png_write_iccp(PNGEncContext *s, const AVFrameSideData *sd)
335 {
336 249 z_stream *const zstream = &s->zstream.zstream;
337 const AVDictionaryEntry *entry;
338 const char *name;
339 uint8_t *start, *buf;
340 int ret;
341
342
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 249 if (!sd || !sd->size)
343 248 return 0;
344 1 zstream->next_in = sd->data;
345 1 zstream->avail_in = sd->size;
346
347 /* write the chunk contents first */
348 1 start = s->bytestream + 8; /* make room for iCCP tag + length */
349 1 buf = start;
350
351 /* profile description */
352 1 entry = av_dict_get(sd->metadata, "name", NULL, 0);
353
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 1 name = (entry && entry->value[0]) ? entry->value : "icc";
354 22 for (int i = 0;; i++) {
355
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 22 char c = (i == 79) ? 0 : name[i];
356 22 bytestream_put_byte(&buf, c);
357
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 22 if (!c)
358 1 break;
359 }
360
361 /* compression method and profile data */
362 1 bytestream_put_byte(&buf, 0);
363 1 zstream->next_out = buf;
364 1 zstream->avail_out = s->bytestream_end - buf;
365 1 ret = deflate(zstream, Z_FINISH);
366 1 deflateReset(zstream);
367
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 1 if (ret != Z_STREAM_END)
368 ✗ return AVERROR_EXTERNAL;
369
370 /* rewind to the start and write the chunk header/crc */
371 1 png_write_chunk(&s->bytestream, MKTAG('i', 'C', 'C', 'P'), start,
372 1 zstream->next_out - start);
373 1 return 0;
374 }
375
376 249 static int encode_headers(AVCodecContext *avctx, const AVFrame *pict)
377 {
378 AVFrameSideData *side_data;
379 249 PNGEncContext *s = avctx->priv_data;
380 249 AVBufferRef *exif_data = NULL;
381 int ret;
382
383 /* write png header */
384 249 AV_WB32(s->buf, avctx->width);
385 249 AV_WB32(s->buf + 4, avctx->height);
386 249 s->buf[8] = s->bit_depth;
387 249 s->buf[9] = s->color_type;
388 249 s->buf[10] = 0; /* compression type */
389 249 s->buf[11] = 0; /* filter type */
390 249 s->buf[12] = s->is_progressive; /* interlace type */
391 249 png_write_chunk(&s->bytestream, MKTAG('I', 'H', 'D', 'R'), s->buf, 13);
392
393 /* write physical information */
394
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 249 if (s->dpm) {
395 ✗ AV_WB32(s->buf, s->dpm);
396 ✗ AV_WB32(s->buf + 4, s->dpm);
397 ✗ s->buf[8] = 1; /* unit specifier is meter */
398 } else {
399 249 AV_WB32(s->buf, avctx->sample_aspect_ratio.num);
400 249 AV_WB32(s->buf + 4, avctx->sample_aspect_ratio.den);
401 249 s->buf[8] = 0; /* unit specifier is unknown */
402 }
403 249 png_write_chunk(&s->bytestream, MKTAG('p', 'H', 'Y', 's'), s->buf, 9);
404
405 /* write stereoscopic information */
406 249 side_data = av_frame_get_side_data(pict, AV_FRAME_DATA_STEREO3D);
407
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 249 if (side_data) {
408 ✗ AVStereo3D *stereo3d = (AVStereo3D *)side_data->data;
409 ✗ switch (stereo3d->type) {
410 ✗ case AV_STEREO3D_SIDEBYSIDE:
411 ✗ s->buf[0] = ((stereo3d->flags & AV_STEREO3D_FLAG_INVERT) == 0) ? 1 : 0;
412 ✗ png_write_chunk(&s->bytestream, MKTAG('s', 'T', 'E', 'R'), s->buf, 1);
413 ✗ break;
414 ✗ case AV_STEREO3D_2D:
415 ✗ break;
416 ✗ default:
417 ✗ av_log(avctx, AV_LOG_WARNING, "Only side-by-side stereo3d flag can be defined within sTER chunk\n");
418 ✗ break;
419 }
420 }
421
422 249 ret = ff_exif_get_buffer(avctx, pict, &exif_data, AV_EXIF_TIFF_HEADER);
423
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 249 if (exif_data) {
424 // png_write_chunk accepts an int, not a size_t, so we have to check overflow
425
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 3 if (exif_data->size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
426 // that's a very big exif chunk, probably a bug
427 ✗ av_log(avctx, AV_LOG_ERROR, "extremely large EXIF buffer detected, not writing\n");
428 else
429 3 png_write_chunk(&s->bytestream, MKTAG('e','X','I','f'), exif_data->data, exif_data->size);
430 3 av_buffer_unref(&exif_data);
431
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 246 } else if (ret < 0) {
432 ✗ av_log(avctx, AV_LOG_WARNING, "unable to attach EXIF metadata: %s\n", av_err2str(ret));
433 }
434
435 249 side_data = av_frame_get_side_data(pict, AV_FRAME_DATA_ICC_PROFILE);
436
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 249 if ((ret = png_write_iccp(s, side_data)))
437 ✗ return ret;
438
439 /* write colorspace information */
440
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 249 if (pict->color_primaries == AVCOL_PRI_BT709 &&
441
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 1 pict->color_trc == AVCOL_TRC_IEC61966_2_1) {
442 ✗ s->buf[0] = 1; /* rendering intent, relative colorimetric by default */
443 ✗ png_write_chunk(&s->bytestream, MKTAG('s', 'R', 'G', 'B'), s->buf, 1);
444
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 249 } else if (pict->color_trc != AVCOL_TRC_UNSPECIFIED && !side_data) {
445 /*
446 * Avoid writing cICP if the transfer is unknown. Known primaries
447 * with unknown transfer can be handled by cHRM.
448 *
449 * We also avoid writing cICP if an ICC Profile is present, because
450 * the standard requires that cICP overrides iCCP.
451 *
452 * These values match H.273 so no translation is needed.
453 */
454 1 s->buf[0] = pict->color_primaries;
455 1 s->buf[1] = pict->color_trc;
456 1 s->buf[2] = 0; /* colorspace = RGB */
457 1 s->buf[3] = pict->color_range == AVCOL_RANGE_MPEG ? 0 : 1;
458 1 png_write_chunk(&s->bytestream, MKTAG('c', 'I', 'C', 'P'), s->buf, 4);
459 }
460
461 249 side_data = av_frame_get_side_data(pict, AV_FRAME_DATA_CONTENT_LIGHT_LEVEL);
462
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 249 if (side_data) {
463 1 AVContentLightMetadata *clli = (AVContentLightMetadata *) side_data->data;
464 1 AV_WB32(s->buf, clli->MaxCLL * 10000);
465 1 AV_WB32(s->buf + 4, clli->MaxFALL * 10000);
466 1 png_write_chunk(&s->bytestream, MKTAG('c', 'L', 'L', 'I'), s->buf, 8);
467 }
468
469 249 side_data = av_frame_get_side_data(pict, AV_FRAME_DATA_MASTERING_DISPLAY_METADATA);
470
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 249 if (side_data) {
471 1 AVMasteringDisplayMetadata *mdcv = (AVMasteringDisplayMetadata *) side_data->data;
472
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 1 if (mdcv->has_luminance && mdcv->has_primaries) {
473
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 4 for (int i = 0; i < 3; i++) {
474 3 AV_WB16(s->buf + 2*i, PNG_Q2D(mdcv->display_primaries[i][0], 50000));
475 3 AV_WB16(s->buf + 2*i + 2, PNG_Q2D(mdcv->display_primaries[i][1], 50000));
476 }
477 1 AV_WB16(s->buf + 12, PNG_Q2D(mdcv->white_point[0], 50000));
478 1 AV_WB16(s->buf + 14, PNG_Q2D(mdcv->white_point[1], 50000));
479 1 AV_WB32(s->buf + 16, PNG_Q2D(mdcv->max_luminance, 10000));
480 1 AV_WB32(s->buf + 20, PNG_Q2D(mdcv->min_luminance, 10000));
481 1 png_write_chunk(&s->bytestream, MKTAG('m', 'D', 'C', 'V'), s->buf, 24);
482 }
483 }
484
485
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 249 if (png_get_chrm(pict->color_primaries, s->buf))
486 2 png_write_chunk(&s->bytestream, MKTAG('c', 'H', 'R', 'M'), s->buf, 32);
487
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 249 if (png_get_gama(pict->color_trc, s->buf))
488 ✗ png_write_chunk(&s->bytestream, MKTAG('g', 'A', 'M', 'A'), s->buf, 4);
489
490
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 249 if (avctx->bits_per_raw_sample > 0 &&
491 ✗ avctx->bits_per_raw_sample < (s->color_type & PNG_COLOR_MASK_PALETTE ? 8 : s->bit_depth)) {
492 ✗ int len = s->color_type & PNG_COLOR_MASK_PALETTE ? 3 : ff_png_get_nb_channels(s->color_type);
493 ✗ memset(s->buf, avctx->bits_per_raw_sample, len);
494 ✗ png_write_chunk(&s->bytestream, MKTAG('s', 'B', 'I', 'T'), s->buf, len);
495 }
496
497 /* put the palette if needed, must be after colorspace information */
498
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 249 if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
499 int has_alpha, alpha, i;
500 unsigned int v;
501 uint32_t *palette;
502 uint8_t *ptr, *alpha_ptr;
503
504 ✗ palette = (uint32_t *)pict->data[1];
505 ✗ ptr = s->buf;
506 ✗ alpha_ptr = s->buf + 256 * 3;
507 ✗ has_alpha = 0;
508 ✗ for (i = 0; i < 256; i++) {
509 ✗ v = palette[i];
510 ✗ alpha = v >> 24;
511 ✗ if (alpha != 0xff)
512 ✗ has_alpha = 1;
513 ✗ *alpha_ptr++ = alpha;
514 ✗ bytestream_put_be24(&ptr, v);
515 }
516 ✗ png_write_chunk(&s->bytestream,
517 ✗ MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3);
518 ✗ if (has_alpha) {
519 ✗ png_write_chunk(&s->bytestream,
520 ✗ MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256);
521 }
522 }
523
524 249 return 0;
525 }
526
527 320 static int encode_frame(AVCodecContext *avctx, const AVFrame *pict)
528 {
529 320 PNGEncContext *s = avctx->priv_data;
530 320 z_stream *const zstream = &s->zstream.zstream;
531 320 const AVFrame *const p = pict;
532 int y, len, ret;
533 int row_size, pass_row_size;
534 uint8_t *crow_buf, *crow;
535 320 uint8_t *crow_base = NULL;
536 320 uint8_t *progressive_buf = NULL;
537 320 uint8_t *top_buf = NULL;
538
539 320 row_size = (pict->width * s->bits_per_pixel + 7) >> 3;
540
541 320 crow_base = av_malloc((row_size + 32) << (s->filter_type == PNG_FILTER_VALUE_MIXED));
542
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 320 if (!crow_base) {
543 ✗ ret = AVERROR(ENOMEM);
544 ✗ goto the_end;
545 }
546 // pixel data should be aligned, but there's a control byte before it
547 320 crow_buf = crow_base + 15;
548
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 320 if (s->is_progressive) {
549 ✗ progressive_buf = av_malloc(row_size + 1);
550 ✗ top_buf = av_malloc(row_size + 1);
551 ✗ if (!progressive_buf || !top_buf) {
552 ✗ ret = AVERROR(ENOMEM);
553 ✗ goto the_end;
554 }
555 }
556
557 /* put each row */
558 320 zstream->avail_out = IOBUF_SIZE;
559 320 zstream->next_out = s->buf;
560
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 320 if (s->is_progressive) {
561 int pass;
562
563 ✗ for (pass = 0; pass < NB_PASSES; pass++) {
564 /* NOTE: a pass is completely omitted if no pixels would be
565 * output */
566 ✗ pass_row_size = ff_png_pass_row_size(pass, s->bits_per_pixel, pict->width);
567 ✗ if (pass_row_size > 0) {
568 ✗ uint8_t *top = NULL;
569 ✗ for (y = 0; y < pict->height; y++)
570 ✗ if ((ff_png_pass_ymask[pass] << (y & 7)) & 0x80) {
571 ✗ const uint8_t *ptr = p->data[0] + y * p->linesize[0];
572 ✗ FFSWAP(uint8_t *, progressive_buf, top_buf);
573 ✗ png_get_interlaced_row(progressive_buf, pass_row_size,
574 s->bits_per_pixel, pass,
575 ✗ ptr, pict->width);
576 ✗ crow = png_choose_filter(s, crow_buf, progressive_buf,
577 ✗ top, pass_row_size, s->bits_per_pixel >> 3);
578 ✗ png_write_row(avctx, crow, pass_row_size + 1);
579 ✗ top = progressive_buf;
580 }
581 }
582 }
583 } else {
584 320 const uint8_t *top = NULL;
585
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 80436 for (y = 0; y < pict->height; y++) {
586 80116 const uint8_t *ptr = p->data[0] + y * p->linesize[0];
587 80116 crow = png_choose_filter(s, crow_buf, ptr, top,
588 80116 row_size, s->bits_per_pixel >> 3);
589 80116 png_write_row(avctx, crow, row_size + 1);
590 80116 top = ptr;
591 }
592 }
593 /* compress last bytes */
594 for (;;) {
595 1130 ret = deflate(zstream, Z_FINISH);
596
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 1130 if (ret == Z_OK || ret == Z_STREAM_END) {
597 1130 len = IOBUF_SIZE - zstream->avail_out;
598
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 1130 if (len > 0 && s->bytestream_end - s->bytestream > len + 100) {
599 1130 png_write_image_data(avctx, s->buf, len);
600 }
601 1130 zstream->avail_out = IOBUF_SIZE;
602 1130 zstream->next_out = s->buf;
603
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 1130 if (ret == Z_STREAM_END)
604 320 break;
605 } else {
606 ✗ ret = -1;
607 ✗ goto the_end;
608 }
609 }
610
611 320 ret = 0;
612
613 320 the_end:
614 320 av_freep(&crow_base);
615 320 av_freep(&progressive_buf);
616 320 av_freep(&top_buf);
617 320 deflateReset(zstream);
618 320 return ret;
619 }
620
621 249 static int add_icc_profile_size(AVCodecContext *avctx, const AVFrame *pict,
622 uint64_t *max_packet_size)
623 {
624 249 PNGEncContext *s = avctx->priv_data;
625 const AVFrameSideData *sd;
626 249 const int hdr_size = 128;
627 uint64_t new_pkt_size;
628 uLong bound;
629
630
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 249 if (!pict)
631 ✗ return 0;
632 249 sd = av_frame_get_side_data(pict, AV_FRAME_DATA_ICC_PROFILE);
633
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 249 if (!sd || !sd->size)
634 248 return 0;
635 if (sd->size != (uLong) sd->size)
636 return AVERROR_INVALIDDATA;
637
638 1 bound = deflateBound(&s->zstream.zstream, sd->size);
639
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 1 if (bound > INT32_MAX - hdr_size)
640 ✗ return AVERROR_INVALIDDATA;
641
642 1 new_pkt_size = *max_packet_size + bound + hdr_size;
643
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 1 if (new_pkt_size < *max_packet_size)
644 ✗ return AVERROR_INVALIDDATA;
645 1 *max_packet_size = new_pkt_size;
646 1 return 0;
647 }
648
649 249 static int add_exif_profile_size(AVCodecContext *avctx, const AVFrame *pict,
650 uint64_t *max_packet_size)
651 {
652 const AVFrameSideData *sd;
653 uint64_t new_pkt_size;
654 /* includes orientation tag */
655 249 const int base_exif_size = 92;
656 uint64_t estimated_exif_size;
657
658 249 sd = av_frame_get_side_data(pict, AV_FRAME_DATA_EXIF);
659
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 249 estimated_exif_size = sd ? sd->size : 0;
660 249 sd = av_frame_get_side_data(pict, AV_FRAME_DATA_DISPLAYMATRIX);
661
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 249 if (sd)
662 1 estimated_exif_size += base_exif_size;
663
664
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 249 if (!estimated_exif_size)
665 246 return 0;
666
667 /* 12 is the png chunk header size */
668 3 new_pkt_size = *max_packet_size + estimated_exif_size + 12;
669
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 3 if (new_pkt_size < *max_packet_size)
670 ✗ return AVERROR_INVALIDDATA;
671
672 3 *max_packet_size = new_pkt_size;
673
674 3 return 0;
675 }
676
677 247 static int encode_png(AVCodecContext *avctx, AVPacket *pkt,
678 const AVFrame *pict, int *got_packet)
679 {
680 247 PNGEncContext *s = avctx->priv_data;
681 int ret;
682 int enc_row_size;
683 uint64_t max_packet_size;
684
685 494 enc_row_size = deflateBound(&s->zstream.zstream,
686 247 (avctx->width * s->bits_per_pixel + 7) >> 3);
687 247 max_packet_size =
688 247 FF_INPUT_BUFFER_MIN_SIZE + // headers
689 247 avctx->height * (
690 247 enc_row_size +
691 247 12 * (((int64_t)enc_row_size + IOBUF_SIZE - 1) / IOBUF_SIZE) // IDAT * ceil(enc_row_size / IOBUF_SIZE)
692 );
693
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 247 if ((ret = add_icc_profile_size(avctx, pict, &max_packet_size)))
694 ✗ return ret;
695 247 ret = add_exif_profile_size(avctx, pict, &max_packet_size);
696
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 247 if (ret < 0)
697 ✗ return ret;
698
699 247 ret = ff_alloc_packet(avctx, pkt, max_packet_size);
700
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 247 if (ret < 0)
701 ✗ return ret;
702
703 247 s->bytestream_start =
704 247 s->bytestream = pkt->data;
705 247 s->bytestream_end = pkt->data + pkt->size;
706
707 247 AV_WB64(s->bytestream, PNGSIG);
708 247 s->bytestream += 8;
709
710 247 ret = encode_headers(avctx, pict);
711
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 247 if (ret < 0)
712 ✗ return ret;
713
714 247 ret = encode_frame(avctx, pict);
715
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 247 if (ret < 0)
716 ✗ return ret;
717
718 247 png_write_chunk(&s->bytestream, MKTAG('I', 'E', 'N', 'D'), NULL, 0);
719
720 247 pkt->size = s->bytestream - s->bytestream_start;
721 247 pkt->flags |= AV_PKT_FLAG_KEY;
722 247 *got_packet = 1;
723
724 247 return 0;
725 }
726
727 142 static int apng_do_inverse_blend(AVFrame *output, const AVFrame *input,
728 APNGFctlChunk *fctl_chunk, uint8_t bpp)
729 {
730 // output: background, input: foreground
731 // output the image such that when blended with the background, will produce the foreground
732
733 unsigned int x, y;
734 142 unsigned int leftmost_x = input->width;
735 142 unsigned int rightmost_x = 0;
736 142 unsigned int topmost_y = input->height;
737 142 unsigned int bottommost_y = 0;
738 142 const uint8_t *input_data = input->data[0];
739 142 uint8_t *output_data = output->data[0];
740 142 ptrdiff_t input_linesize = input->linesize[0];
741 142 ptrdiff_t output_linesize = output->linesize[0];
742
743 // Find bounding box of changes
744
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 41038 for (y = 0; y < input->height; ++y) {
745
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 14436288 for (x = 0; x < input->width; ++x) {
746
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 14395392 if (!memcmp(input_data + bpp * x, output_data + bpp * x, bpp))
747 3066 continue;
748
749
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 14392326 if (x < leftmost_x)
750 142 leftmost_x = x;
751
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 14392326 if (x >= rightmost_x)
752 49984 rightmost_x = x + 1;
753
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 14392326 if (y < topmost_y)
754 142 topmost_y = y;
755
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 14392326 if (y >= bottommost_y)
756 40896 bottommost_y = y + 1;
757 }
758
759 40896 input_data += input_linesize;
760 40896 output_data += output_linesize;
761 }
762
763
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 142 if (leftmost_x == input->width && rightmost_x == 0) {
764 // Empty frame
765 // APNG does not support empty frames, so we make it a 1x1 frame
766 ✗ leftmost_x = topmost_y = 0;
767 ✗ rightmost_x = bottommost_y = 1;
768 }
769
770 // Do actual inverse blending
771
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 142 if (fctl_chunk->blend_op == APNG_BLEND_OP_SOURCE) {
772 71 output_data = output->data[0];
773
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 20519 for (y = topmost_y; y < bottommost_y; ++y) {
774 20448 memcpy(output_data,
775 20448 input->data[0] + input_linesize * y + bpp * leftmost_x,
776 20448 bpp * (rightmost_x - leftmost_x));
777 20448 output_data += output_linesize;
778 }
779 } else { // APNG_BLEND_OP_OVER
780 size_t transparent_palette_index;
781 uint32_t *palette;
782
783
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 71 switch (input->format) {
784 ✗ case AV_PIX_FMT_RGBA64BE:
785 case AV_PIX_FMT_YA16BE:
786 case AV_PIX_FMT_RGBA:
787 case AV_PIX_FMT_GRAY8A:
788 ✗ break;
789
790 ✗ case AV_PIX_FMT_PAL8:
791 ✗ palette = (uint32_t*)input->data[1];
792 ✗ for (transparent_palette_index = 0; transparent_palette_index < 256; ++transparent_palette_index)
793 ✗ if (palette[transparent_palette_index] >> 24 == 0)
794 ✗ break;
795 ✗ break;
796
797 71 default:
798 // No alpha, so blending not possible
799 71 return -1;
800 }
801
802 ✗ for (y = topmost_y; y < bottommost_y; ++y) {
803 ✗ const uint8_t *foreground = input->data[0] + input_linesize * y + bpp * leftmost_x;
804 ✗ uint8_t *background = output->data[0] + output_linesize * y + bpp * leftmost_x;
805 ✗ output_data = output->data[0] + output_linesize * (y - topmost_y);
806 ✗ for (x = leftmost_x; x < rightmost_x; ++x, foreground += bpp, background += bpp, output_data += bpp) {
807 ✗ if (!memcmp(foreground, background, bpp)) {
808 ✗ if (input->format == AV_PIX_FMT_PAL8) {
809 ✗ if (transparent_palette_index == 256) {
810 // Need fully transparent colour, but none exists
811 ✗ return -1;
812 }
813
814 ✗ *output_data = transparent_palette_index;
815 } else {
816 ✗ memset(output_data, 0, bpp);
817 }
818 ✗ continue;
819 }
820
821 // Check for special alpha values, since full inverse
822 // alpha-on-alpha blending is rarely possible, and when
823 // possible, doesn't compress much better than
824 // APNG_BLEND_OP_SOURCE blending
825 ✗ switch (input->format) {
826 ✗ case AV_PIX_FMT_RGBA64BE:
827 ✗ if (((uint16_t*)foreground)[3] == 0xffff ||
828 ✗ ((uint16_t*)background)[3] == 0)
829 break;
830 ✗ return -1;
831
832 ✗ case AV_PIX_FMT_YA16BE:
833 ✗ if (((uint16_t*)foreground)[1] == 0xffff ||
834 ✗ ((uint16_t*)background)[1] == 0)
835 break;
836 ✗ return -1;
837
838 ✗ case AV_PIX_FMT_RGBA:
839 ✗ if (foreground[3] == 0xff || background[3] == 0)
840 break;
841 ✗ return -1;
842
843 ✗ case AV_PIX_FMT_GRAY8A:
844 ✗ if (foreground[1] == 0xff || background[1] == 0)
845 break;
846 ✗ return -1;
847
848 ✗ case AV_PIX_FMT_PAL8:
849 ✗ if (palette[*foreground] >> 24 == 0xff ||
850 ✗ palette[*background] >> 24 == 0)
851 break;
852 ✗ return -1;
853
854 ✗ default:
855 ✗ av_unreachable("Pixfmt has been checked before");
856 }
857
858 ✗ memmove(output_data, foreground, bpp);
859 }
860 }
861 }
862
863 71 output->width = rightmost_x - leftmost_x;
864 71 output->height = bottommost_y - topmost_y;
865 71 fctl_chunk->width = output->width;
866 71 fctl_chunk->height = output->height;
867 71 fctl_chunk->x_offset = leftmost_x;
868 71 fctl_chunk->y_offset = topmost_y;
869
870 71 return 0;
871 }
872
873 26 static int apng_encode_frame(AVCodecContext *avctx, const AVFrame *pict,
874 APNGFctlChunk *best_fctl_chunk, APNGFctlChunk *best_last_fctl_chunk)
875 {
876 26 PNGEncContext *s = avctx->priv_data;
877 int ret;
878 unsigned int y;
879 AVFrame* diffFrame;
880 26 uint8_t bpp = (s->bits_per_pixel + 7) >> 3;
881 uint8_t *original_bytestream, *original_bytestream_end;
882 26 uint8_t *temp_bytestream = 0, *temp_bytestream_end;
883 uint32_t best_sequence_number;
884 uint8_t *best_bytestream;
885 26 size_t best_bytestream_size = SIZE_MAX;
886 26 APNGFctlChunk last_fctl_chunk = *best_last_fctl_chunk;
887 26 APNGFctlChunk fctl_chunk = *best_fctl_chunk;
888
889
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 26 if (avctx->frame_num == 0) {
890 2 best_fctl_chunk->width = pict->width;
891 2 best_fctl_chunk->height = pict->height;
892 2 best_fctl_chunk->x_offset = 0;
893 2 best_fctl_chunk->y_offset = 0;
894 2 best_fctl_chunk->blend_op = APNG_BLEND_OP_SOURCE;
895 2 return encode_frame(avctx, pict);
896 }
897
898 24 diffFrame = av_frame_alloc();
899
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 24 if (!diffFrame)
900 ✗ return AVERROR(ENOMEM);
901
902 24 diffFrame->format = pict->format;
903 24 diffFrame->width = pict->width;
904 24 diffFrame->height = pict->height;
905
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 24 if ((ret = av_frame_get_buffer(diffFrame, 0)) < 0)
906 ✗ goto fail;
907
908 24 original_bytestream = s->bytestream;
909 24 original_bytestream_end = s->bytestream_end;
910
911 24 temp_bytestream = av_malloc(original_bytestream_end - original_bytestream);
912
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 24 if (!temp_bytestream) {
913 ✗ ret = AVERROR(ENOMEM);
914 ✗ goto fail;
915 }
916 24 temp_bytestream_end = temp_bytestream + (original_bytestream_end - original_bytestream);
917
918
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 96 for (last_fctl_chunk.dispose_op = 0; last_fctl_chunk.dispose_op < 3; ++last_fctl_chunk.dispose_op) {
919 // 0: APNG_DISPOSE_OP_NONE
920 // 1: APNG_DISPOSE_OP_BACKGROUND
921 // 2: APNG_DISPOSE_OP_PREVIOUS
922
923
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 216 for (fctl_chunk.blend_op = 0; fctl_chunk.blend_op < 2; ++fctl_chunk.blend_op) {
924 // 0: APNG_BLEND_OP_SOURCE
925 // 1: APNG_BLEND_OP_OVER
926
927 144 uint32_t original_sequence_number = s->sequence_number, sequence_number;
928 144 uint8_t *bytestream_start = s->bytestream;
929 size_t bytestream_size;
930
931 // Do disposal
932
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 144 if (last_fctl_chunk.dispose_op != APNG_DISPOSE_OP_PREVIOUS) {
933 96 diffFrame->width = pict->width;
934 96 diffFrame->height = pict->height;
935 96 ret = av_frame_copy(diffFrame, s->last_frame);
936
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 96 if (ret < 0)
937 ✗ goto fail;
938
939
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 96 if (last_fctl_chunk.dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
940
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 13872 for (y = last_fctl_chunk.y_offset; y < last_fctl_chunk.y_offset + last_fctl_chunk.height; ++y) {
941 13824 size_t row_start = diffFrame->linesize[0] * y + bpp * last_fctl_chunk.x_offset;
942 13824 memset(diffFrame->data[0] + row_start, 0, bpp * last_fctl_chunk.width);
943 }
944 }
945 } else {
946
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 48 if (!s->prev_frame)
947 2 continue;
948
949 46 diffFrame->width = pict->width;
950 46 diffFrame->height = pict->height;
951 46 ret = av_frame_copy(diffFrame, s->prev_frame);
952
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 46 if (ret < 0)
953 ✗ goto fail;
954 }
955
956 // Do inverse blending
957
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 142 if (apng_do_inverse_blend(diffFrame, pict, &fctl_chunk, bpp) < 0)
958 71 continue;
959
960 // Do encoding
961 71 ret = encode_frame(avctx, diffFrame);
962 71 sequence_number = s->sequence_number;
963 71 s->sequence_number = original_sequence_number;
964 71 bytestream_size = s->bytestream - bytestream_start;
965 71 s->bytestream = bytestream_start;
966
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 71 if (ret < 0)
967 ✗ goto fail;
968
969
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 71 if (bytestream_size < best_bytestream_size) {
970 24 *best_fctl_chunk = fctl_chunk;
971 24 *best_last_fctl_chunk = last_fctl_chunk;
972
973 24 best_sequence_number = sequence_number;
974 24 best_bytestream = s->bytestream;
975 24 best_bytestream_size = bytestream_size;
976
977
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 24 if (best_bytestream == original_bytestream) {
978 24 s->bytestream = temp_bytestream;
979 24 s->bytestream_end = temp_bytestream_end;
980 } else {
981 ✗ s->bytestream = original_bytestream;
982 ✗ s->bytestream_end = original_bytestream_end;
983 }
984 }
985 }
986 }
987
988 24 s->sequence_number = best_sequence_number;
989 24 s->bytestream = original_bytestream + best_bytestream_size;
990 24 s->bytestream_end = original_bytestream_end;
991
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 24 if (best_bytestream != original_bytestream)
992 ✗ memcpy(original_bytestream, best_bytestream, best_bytestream_size);
993
994 24 ret = 0;
995
996 24 fail:
997 24 av_freep(&temp_bytestream);
998 24 av_frame_free(&diffFrame);
999 24 return ret;
1000 }
1001
1002 30 static int encode_apng(AVCodecContext *avctx, AVPacket *pkt,
1003 const AVFrame *pict, int *got_packet)
1004 {
1005 30 PNGEncContext *s = avctx->priv_data;
1006 int ret;
1007 int enc_row_size;
1008 uint64_t max_packet_size;
1009 30 APNGFctlChunk fctl_chunk = {0};
1010
1011
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 30 if (pict && s->color_type == PNG_COLOR_TYPE_PALETTE) {
1012 ✗ uint32_t checksum = ~av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), ~0U, pict->data[1], 256 * sizeof(uint32_t));
1013
1014 ✗ if (avctx->frame_num == 0) {
1015 ✗ s->palette_checksum = checksum;
1016 ✗ } else if (checksum != s->palette_checksum) {
1017 ✗ av_log(avctx, AV_LOG_ERROR,
1018 "Input contains more than one unique palette. APNG does not support multiple palettes.\n");
1019 ✗ return -1;
1020 }
1021 }
1022
1023 60 enc_row_size = deflateBound(&s->zstream.zstream,
1024 30 (avctx->width * s->bits_per_pixel + 7) >> 3);
1025 30 max_packet_size =
1026 30 FF_INPUT_BUFFER_MIN_SIZE + // headers
1027 30 avctx->height * (
1028 30 enc_row_size +
1029 30 (4 + 12) * (((int64_t)enc_row_size + IOBUF_SIZE - 1) / IOBUF_SIZE) // fdAT * ceil(enc_row_size / IOBUF_SIZE)
1030 );
1031
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 30 if (max_packet_size > INT_MAX)
1032 ✗ return AVERROR(ENOMEM);
1033
1034
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 30 if (avctx->frame_num == 0) {
1035
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 2 if (!pict)
1036 ✗ return AVERROR(EINVAL);
1037 2 uint64_t extradata_size = FF_INPUT_BUFFER_MIN_SIZE;
1038 2 ret = add_icc_profile_size(avctx, pict, &extradata_size);
1039
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 2 if (ret < 0)
1040 ✗ return ret;
1041 2 ret = add_exif_profile_size(avctx, pict, &extradata_size);
1042
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 2 if (ret < 0)
1043 ✗ return ret;
1044 /* the compiler will optimize this out if UINT64_MAX == SIZE_MAX */
1045 if (extradata_size > SIZE_MAX)
1046 return AVERROR(ENOMEM);
1047 2 s->bytestream = s->extra_data = av_malloc(extradata_size);
1048
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 2 if (!s->extra_data)
1049 ✗ return AVERROR(ENOMEM);
1050
1051 2 ret = encode_headers(avctx, pict);
1052
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 2 if (ret < 0)
1053 ✗ return ret;
1054
1055 2 s->extra_data_size = s->bytestream - s->extra_data;
1056
1057 2 s->last_frame_packet = av_malloc(max_packet_size);
1058
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 2 if (!s->last_frame_packet)
1059 ✗ return AVERROR(ENOMEM);
1060
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 28 } else if (s->last_frame) {
1061 26 ret = ff_get_encode_buffer(avctx, pkt, s->last_frame_packet_size, 0);
1062
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 26 if (ret < 0)
1063 ✗ return ret;
1064
1065 26 memcpy(pkt->data, s->last_frame_packet, s->last_frame_packet_size);
1066 26 pkt->pts = s->last_frame->pts;
1067 26 pkt->duration = s->last_frame->duration;
1068
1069 26 ret = ff_encode_reordered_opaque(avctx, pkt, s->last_frame);
1070
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 26 if (ret < 0)
1071 ✗ return ret;
1072 }
1073
1074
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 30 if (pict) {
1075 26 s->bytestream_start =
1076 26 s->bytestream = s->last_frame_packet;
1077 26 s->bytestream_end = s->bytestream + max_packet_size;
1078
1079 // We're encoding the frame first, so we have to do a bit of shuffling around
1080 // to have the image data write to the correct place in the buffer
1081 26 fctl_chunk.sequence_number = s->sequence_number;
1082 26 ++s->sequence_number;
1083 26 s->bytestream += APNG_FCTL_CHUNK_SIZE + 12;
1084
1085 26 ret = apng_encode_frame(avctx, pict, &fctl_chunk, &s->last_frame_fctl);
1086
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 26 if (ret < 0)
1087 ✗ return ret;
1088
1089 26 fctl_chunk.delay_num = 0; // delay filled in during muxing
1090 26 fctl_chunk.delay_den = 0;
1091 } else {
1092 4 s->last_frame_fctl.dispose_op = APNG_DISPOSE_OP_NONE;
1093 }
1094
1095
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 30 if (s->last_frame) {
1096 26 uint8_t* last_fctl_chunk_start = pkt->data;
1097 uint8_t buf[APNG_FCTL_CHUNK_SIZE];
1098
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 26 if (!s->extra_data_updated) {
1099 2 uint8_t *side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, s->extra_data_size);
1100
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 2 if (!side_data)
1101 ✗ return AVERROR(ENOMEM);
1102 2 memcpy(side_data, s->extra_data, s->extra_data_size);
1103 2 s->extra_data_updated = 1;
1104 }
1105
1106 26 AV_WB32(buf + 0, s->last_frame_fctl.sequence_number);
1107 26 AV_WB32(buf + 4, s->last_frame_fctl.width);
1108 26 AV_WB32(buf + 8, s->last_frame_fctl.height);
1109 26 AV_WB32(buf + 12, s->last_frame_fctl.x_offset);
1110 26 AV_WB32(buf + 16, s->last_frame_fctl.y_offset);
1111 26 AV_WB16(buf + 20, s->last_frame_fctl.delay_num);
1112 26 AV_WB16(buf + 22, s->last_frame_fctl.delay_den);
1113 26 buf[24] = s->last_frame_fctl.dispose_op;
1114 26 buf[25] = s->last_frame_fctl.blend_op;
1115 26 png_write_chunk(&last_fctl_chunk_start, MKTAG('f', 'c', 'T', 'L'), buf, sizeof(buf));
1116
1117 26 *got_packet = 1;
1118 }
1119
1120
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 30 if (pict) {
1121
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 26 if (!s->last_frame) {
1122 2 s->last_frame = av_frame_alloc();
1123
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 2 if (!s->last_frame)
1124 ✗ return AVERROR(ENOMEM);
1125
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 24 } else if (s->last_frame_fctl.dispose_op != APNG_DISPOSE_OP_PREVIOUS) {
1126
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 24 if (!s->prev_frame) {
1127 1 s->prev_frame = av_frame_alloc();
1128
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 1 if (!s->prev_frame)
1129 ✗ return AVERROR(ENOMEM);
1130
1131 1 s->prev_frame->format = pict->format;
1132 1 s->prev_frame->width = pict->width;
1133 1 s->prev_frame->height = pict->height;
1134
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 1 if ((ret = av_frame_get_buffer(s->prev_frame, 0)) < 0)
1135 ✗ return ret;
1136 }
1137
1138 // Do disposal, but not blending
1139 24 av_frame_copy(s->prev_frame, s->last_frame);
1140
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 24 if (s->last_frame_fctl.dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
1141 uint32_t y;
1142 ✗ uint8_t bpp = (s->bits_per_pixel + 7) >> 3;
1143 ✗ for (y = s->last_frame_fctl.y_offset; y < s->last_frame_fctl.y_offset + s->last_frame_fctl.height; ++y) {
1144 ✗ size_t row_start = s->prev_frame->linesize[0] * y + bpp * s->last_frame_fctl.x_offset;
1145 ✗ memset(s->prev_frame->data[0] + row_start, 0, bpp * s->last_frame_fctl.width);
1146 }
1147 }
1148 }
1149
1150 26 ret = av_frame_replace(s->last_frame, pict);
1151
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 26 if (ret < 0)
1152 ✗ return ret;
1153
1154 26 s->last_frame_fctl = fctl_chunk;
1155 26 s->last_frame_packet_size = s->bytestream - s->bytestream_start;
1156 } else {
1157 4 av_frame_free(&s->last_frame);
1158 }
1159
1160 30 return 0;
1161 }
1162
1163 25 static av_cold int png_enc_init(AVCodecContext *avctx)
1164 {
1165 25 PNGEncContext *s = avctx->priv_data;
1166 int compression_level;
1167
1168
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 25 switch (avctx->pix_fmt) {
1169 ✗ case AV_PIX_FMT_RGBA:
1170 ✗ avctx->bits_per_coded_sample = 32;
1171 ✗ break;
1172 23 case AV_PIX_FMT_RGB24:
1173 23 avctx->bits_per_coded_sample = 24;
1174 23 break;
1175 ✗ case AV_PIX_FMT_GRAY8:
1176 ✗ avctx->bits_per_coded_sample = 0x28;
1177 ✗ break;
1178 ✗ case AV_PIX_FMT_MONOBLACK:
1179 ✗ avctx->bits_per_coded_sample = 1;
1180 ✗ break;
1181 ✗ case AV_PIX_FMT_PAL8:
1182 ✗ avctx->bits_per_coded_sample = 8;
1183 }
1184
1185 25 ff_llvidencdsp_init(&s->llvidencdsp);
1186
1187
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 25 if (avctx->pix_fmt == AV_PIX_FMT_MONOBLACK)
1188 ✗ s->filter_type = PNG_FILTER_VALUE_NONE;
1189
1190
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 25 if (s->dpi && s->dpm) {
1191 ✗ av_log(avctx, AV_LOG_ERROR, "Only one of 'dpi' or 'dpm' options should be set\n");
1192 ✗ return AVERROR(EINVAL);
1193
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 25 } else if (s->dpi) {
1194 ✗ s->dpm = s->dpi * 10000 / 254;
1195 }
1196
1197 25 s->is_progressive = !!(avctx->flags & AV_CODEC_FLAG_INTERLACED_DCT);
1198
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 25 switch (avctx->pix_fmt) {
1199 ✗ case AV_PIX_FMT_RGBA64BE:
1200 ✗ s->bit_depth = 16;
1201 ✗ s->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
1202 ✗ break;
1203 1 case AV_PIX_FMT_RGB48BE:
1204 1 s->bit_depth = 16;
1205 1 s->color_type = PNG_COLOR_TYPE_RGB;
1206 1 break;
1207 ✗ case AV_PIX_FMT_RGBA:
1208 ✗ s->bit_depth = 8;
1209 ✗ s->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
1210 ✗ break;
1211 23 case AV_PIX_FMT_RGB24:
1212 23 s->bit_depth = 8;
1213 23 s->color_type = PNG_COLOR_TYPE_RGB;
1214 23 break;
1215 1 case AV_PIX_FMT_GRAY16BE:
1216 1 s->bit_depth = 16;
1217 1 s->color_type = PNG_COLOR_TYPE_GRAY;
1218 1 break;
1219 ✗ case AV_PIX_FMT_GRAY8:
1220 ✗ s->bit_depth = 8;
1221 ✗ s->color_type = PNG_COLOR_TYPE_GRAY;
1222 ✗ break;
1223 ✗ case AV_PIX_FMT_GRAY8A:
1224 ✗ s->bit_depth = 8;
1225 ✗ s->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
1226 ✗ break;
1227 ✗ case AV_PIX_FMT_YA16BE:
1228 ✗ s->bit_depth = 16;
1229 ✗ s->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
1230 ✗ break;
1231 ✗ case AV_PIX_FMT_MONOBLACK:
1232 ✗ s->bit_depth = 1;
1233 ✗ s->color_type = PNG_COLOR_TYPE_GRAY;
1234 ✗ break;
1235 ✗ case AV_PIX_FMT_PAL8:
1236 ✗ s->bit_depth = 8;
1237 ✗ s->color_type = PNG_COLOR_TYPE_PALETTE;
1238 ✗ break;
1239 ✗ default:
1240 ✗ av_unreachable("Already checked via CODEC_PIXFMTS");
1241 }
1242 25 s->bits_per_pixel = ff_png_get_nb_channels(s->color_type) * s->bit_depth;
1243
1244 50 compression_level = avctx->compression_level == FF_COMPRESSION_DEFAULT
1245 ? Z_DEFAULT_COMPRESSION
1246
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 25 : av_clip(avctx->compression_level, 0, 9);
1247 25 return ff_deflate_init(&s->zstream, compression_level, avctx);
1248 }
1249
1250 25 static av_cold int png_enc_close(AVCodecContext *avctx)
1251 {
1252 25 PNGEncContext *s = avctx->priv_data;
1253
1254 25 ff_deflate_end(&s->zstream);
1255 25 av_frame_free(&s->last_frame);
1256 25 av_frame_free(&s->prev_frame);
1257 25 av_freep(&s->last_frame_packet);
1258 25 av_freep(&s->extra_data);
1259 25 s->extra_data_size = 0;
1260 25 return 0;
1261 }
1262
1263 #define OFFSET(x) offsetof(PNGEncContext, x)
1264 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
1265 static const AVOption options[] = {
1266 {"dpi", "Set image resolution (in dots per inch)", OFFSET(dpi), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 0x10000, VE},
1267 {"dpm", "Set image resolution (in dots per meter)", OFFSET(dpm), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 0x10000, VE},
1268 { "pred", "Prediction method", OFFSET(filter_type), AV_OPT_TYPE_INT, { .i64 = PNG_FILTER_VALUE_PAETH }, PNG_FILTER_VALUE_NONE, PNG_FILTER_VALUE_MIXED, VE, .unit = "pred" },
1269 { "none", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_NONE }, INT_MIN, INT_MAX, VE, .unit = "pred" },
1270 { "sub", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_SUB }, INT_MIN, INT_MAX, VE, .unit = "pred" },
1271 { "up", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_UP }, INT_MIN, INT_MAX, VE, .unit = "pred" },
1272 { "avg", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_AVG }, INT_MIN, INT_MAX, VE, .unit = "pred" },
1273 { "paeth", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_PAETH }, INT_MIN, INT_MAX, VE, .unit = "pred" },
1274 { "mixed", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_MIXED }, INT_MIN, INT_MAX, VE, .unit = "pred" },
1275 { NULL},
1276 };
1277
1278 static const AVClass pngenc_class = {
1279 .class_name = "(A)PNG encoder",
1280 .item_name = av_default_item_name,
1281 .option = options,
1282 .version = LIBAVUTIL_VERSION_INT,
1283 };
1284
1285 const FFCodec ff_png_encoder = {
1286 .p.name = "png",
1287 CODEC_LONG_NAME("PNG (Portable Network Graphics) image"),
1288 .p.type = AVMEDIA_TYPE_VIDEO,
1289 .p.id = AV_CODEC_ID_PNG,
1290 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
1291 AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
1292 .priv_data_size = sizeof(PNGEncContext),
1293 .init = png_enc_init,
1294 .close = png_enc_close,
1295 FF_CODEC_ENCODE_CB(encode_png),
1296 CODEC_PIXFMTS(AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
1297 AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGBA64BE,
1298 AV_PIX_FMT_PAL8,
1299 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A,
1300 AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_YA16BE,
1301 AV_PIX_FMT_MONOBLACK),
1302 .alpha_modes = (const enum AVAlphaMode[]) {
1303 AVALPHA_MODE_STRAIGHT, AVALPHA_MODE_UNSPECIFIED
1304 },
1305 .p.priv_class = &pngenc_class,
1306 .caps_internal = FF_CODEC_CAP_ICC_PROFILES,
1307 };
1308
1309 const FFCodec ff_apng_encoder = {
1310 .p.name = "apng",
1311 CODEC_LONG_NAME("APNG (Animated Portable Network Graphics) image"),
1312 .p.type = AVMEDIA_TYPE_VIDEO,
1313 .p.id = AV_CODEC_ID_APNG,
1314 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
1315 AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
1316 .priv_data_size = sizeof(PNGEncContext),
1317 .init = png_enc_init,
1318 .close = png_enc_close,
1319 FF_CODEC_ENCODE_CB(encode_apng),
1320 CODEC_PIXFMTS(AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
1321 AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGBA64BE,
1322 AV_PIX_FMT_PAL8,
1323 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A,
1324 AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_YA16BE),
1325 .alpha_modes = (const enum AVAlphaMode[]) {
1326 AVALPHA_MODE_STRAIGHT, AVALPHA_MODE_UNSPECIFIED
1327 },
1328 .p.priv_class = &pngenc_class,
1329 .caps_internal = FF_CODEC_CAP_ICC_PROFILES,
1330 };
1331