| 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 "internal.h" |
| 24 | #include "bytestream.h" |
| 25 | #include "huffyuvencdsp.h" |
| 26 | #include "png.h" |
| 27 | |
| 28 | #include "libavutil/avassert.h" |
| 29 | #include "libavutil/opt.h" |
| 30 | |
| 31 | #include <zlib.h> |
| 32 | |
| 33 | #define IOBUF_SIZE 4096 |
| 34 | |
| 35 | typedef struct PNGEncContext { |
| 36 | AVClass *class; |
| 37 | HuffYUVEncDSPContext hdsp; |
| 38 | |
| 39 | uint8_t *bytestream; |
| 40 | uint8_t *bytestream_start; |
| 41 | uint8_t *bytestream_end; |
| 42 | |
| 43 | int filter_type; |
| 44 | |
| 45 | z_stream zstream; |
| 46 | uint8_t buf[IOBUF_SIZE]; |
| 47 | int dpi; ///< Physical pixel density, in dots per inch, if set |
| 48 | int dpm; ///< Physical pixel density, in dots per meter, if set |
| 49 | } PNGEncContext; |
| 50 | |
| 51 | static void png_get_interlaced_row(uint8_t *dst, int row_size, |
| 52 | int bits_per_pixel, int pass, |
| 53 | const uint8_t *src, int width) |
| 54 | { |
| 55 | int x, mask, dst_x, j, b, bpp; |
| 56 | uint8_t *d; |
| 57 | const uint8_t *s; |
| 58 | static const int masks[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; |
| 59 | |
| 60 | mask = masks[pass]; |
| 61 | switch (bits_per_pixel) { |
| 62 | case 1: |
| 63 | memset(dst, 0, row_size); |
| 64 | dst_x = 0; |
| 65 | for (x = 0; x < width; x++) { |
| 66 | j = (x & 7); |
| 67 | if ((mask << j) & 0x80) { |
| 68 | b = (src[x >> 3] >> (7 - j)) & 1; |
| 69 | dst[dst_x >> 3] |= b << (7 - (dst_x & 7)); |
| 70 | dst_x++; |
| 71 | } |
| 72 | } |
| 73 | break; |
| 74 | default: |
| 75 | bpp = bits_per_pixel >> 3; |
| 76 | d = dst; |
| 77 | s = src; |
| 78 | for (x = 0; x < width; x++) { |
| 79 | j = x & 7; |
| 80 | if ((mask << j) & 0x80) { |
| 81 | memcpy(d, s, bpp); |
| 82 | d += bpp; |
| 83 | } |
| 84 | s += bpp; |
| 85 | } |
| 86 | break; |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | static void sub_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, |
| 91 | int w, int bpp) |
| 92 | { |
| 93 | int i; |
| 94 | for (i = 0; i < w; i++) { |
| 95 | int a, b, c, p, pa, pb, pc; |
| 96 | |
| 97 | a = src[i - bpp]; |
| 98 | b = top[i]; |
| 99 | c = top[i - bpp]; |
| 100 | |
| 101 | p = b - c; |
| 102 | pc = a - c; |
| 103 | |
| 104 | pa = abs(p); |
| 105 | pb = abs(pc); |
| 106 | pc = abs(p + pc); |
| 107 | |
| 108 | if (pa <= pb && pa <= pc) |
| 109 | p = a; |
| 110 | else if (pb <= pc) |
| 111 | p = b; |
| 112 | else |
| 113 | p = c; |
| 114 | dst[i] = src[i] - p; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | static void sub_left_prediction(PNGEncContext *c, uint8_t *dst, const uint8_t *src, int bpp, int size) |
| 119 | { |
| 120 | const uint8_t *src1 = src + bpp; |
| 121 | const uint8_t *src2 = src; |
| 122 | int x, unaligned_w; |
| 123 | |
| 124 | memcpy(dst, src, bpp); |
| 125 | dst += bpp; |
| 126 | size -= bpp; |
| 127 | unaligned_w = FFMIN(32 - bpp, size); |
| 128 | for (x = 0; x < unaligned_w; x++) |
| 129 | *dst++ = *src1++ - *src2++; |
| 130 | size -= unaligned_w; |
| 131 | c->hdsp.diff_bytes(dst, src1, src2, size); |
| 132 | } |
| 133 | |
| 134 | static void png_filter_row(PNGEncContext *c, uint8_t *dst, int filter_type, |
| 135 | uint8_t *src, uint8_t *top, int size, int bpp) |
| 136 | { |
| 137 | int i; |
| 138 | |
| 139 | switch (filter_type) { |
| 140 | case PNG_FILTER_VALUE_NONE: |
| 141 | memcpy(dst, src, size); |
| 142 | break; |
| 143 | case PNG_FILTER_VALUE_SUB: |
| 144 | sub_left_prediction(c, dst, src, bpp, size); |
| 145 | break; |
| 146 | case PNG_FILTER_VALUE_UP: |
| 147 | c->hdsp.diff_bytes(dst, src, top, size); |
| 148 | break; |
| 149 | case PNG_FILTER_VALUE_AVG: |
| 150 | for (i = 0; i < bpp; i++) |
| 151 | dst[i] = src[i] - (top[i] >> 1); |
| 152 | for (; i < size; i++) |
| 153 | dst[i] = src[i] - ((src[i - bpp] + top[i]) >> 1); |
| 154 | break; |
| 155 | case PNG_FILTER_VALUE_PAETH: |
| 156 | for (i = 0; i < bpp; i++) |
| 157 | dst[i] = src[i] - top[i]; |
| 158 | sub_png_paeth_prediction(dst + i, src + i, top + i, size - i, bpp); |
| 159 | break; |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | static uint8_t *png_choose_filter(PNGEncContext *s, uint8_t *dst, |
| 164 | uint8_t *src, uint8_t *top, int size, int bpp) |
| 165 | { |
| 166 | int pred = s->filter_type; |
| 167 | av_assert0(bpp || !pred); |
| 168 | if (!top && pred) |
| 169 | pred = PNG_FILTER_VALUE_SUB; |
| 170 | if (pred == PNG_FILTER_VALUE_MIXED) { |
| 171 | int i; |
| 172 | int cost, bcost = INT_MAX; |
| 173 | uint8_t *buf1 = dst, *buf2 = dst + size + 16; |
| 174 | for (pred = 0; pred < 5; pred++) { |
| 175 | png_filter_row(s, buf1 + 1, pred, src, top, size, bpp); |
| 176 | buf1[0] = pred; |
| 177 | cost = 0; |
| 178 | for (i = 0; i <= size; i++) |
| 179 | cost += abs((int8_t) buf1[i]); |
| 180 | if (cost < bcost) { |
| 181 | bcost = cost; |
| 182 | FFSWAP(uint8_t *, buf1, buf2); |
| 183 | } |
| 184 | } |
| 185 | return buf2; |
| 186 | } else { |
| 187 | png_filter_row(s, dst + 1, pred, src, top, size, bpp); |
| 188 | dst[0] = pred; |
| 189 | return dst; |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | static void png_write_chunk(uint8_t **f, uint32_t tag, |
| 194 | const uint8_t *buf, int length) |
| 195 | { |
| 196 | uint32_t crc; |
| 197 | uint8_t tagbuf[4]; |
| 198 | |
| 199 | bytestream_put_be32(f, length); |
| 200 | crc = crc32(0, Z_NULL, 0); |
| 201 | AV_WL32(tagbuf, tag); |
| 202 | crc = crc32(crc, tagbuf, 4); |
| 203 | bytestream_put_be32(f, av_bswap32(tag)); |
| 204 | if (length > 0) { |
| 205 | crc = crc32(crc, buf, length); |
| 206 | memcpy(*f, buf, length); |
| 207 | *f += length; |
| 208 | } |
| 209 | bytestream_put_be32(f, crc); |
| 210 | } |
| 211 | |
| 212 | /* XXX: do filtering */ |
| 213 | static int png_write_row(PNGEncContext *s, const uint8_t *data, int size) |
| 214 | { |
| 215 | int ret; |
| 216 | |
| 217 | s->zstream.avail_in = size; |
| 218 | s->zstream.next_in = data; |
| 219 | while (s->zstream.avail_in > 0) { |
| 220 | ret = deflate(&s->zstream, Z_NO_FLUSH); |
| 221 | if (ret != Z_OK) |
| 222 | return -1; |
| 223 | if (s->zstream.avail_out == 0) { |
| 224 | if (s->bytestream_end - s->bytestream > IOBUF_SIZE + 100) |
| 225 | png_write_chunk(&s->bytestream, |
| 226 | MKTAG('I', 'D', 'A', 'T'), s->buf, IOBUF_SIZE); |
| 227 | s->zstream.avail_out = IOBUF_SIZE; |
| 228 | s->zstream.next_out = s->buf; |
| 229 | } |
| 230 | } |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, |
| 235 | const AVFrame *pict, int *got_packet) |
| 236 | { |
| 237 | PNGEncContext *s = avctx->priv_data; |
| 238 | const AVFrame *const p = pict; |
| 239 | int bit_depth, color_type, y, len, row_size, ret, is_progressive; |
| 240 | int bits_per_pixel, pass_row_size, enc_row_size; |
| 241 | int64_t max_packet_size; |
| 242 | int compression_level; |
| 243 | uint8_t *ptr, *top, *crow_buf, *crow; |
| 244 | uint8_t *crow_base = NULL; |
| 245 | uint8_t *progressive_buf = NULL; |
| 246 | uint8_t *top_buf = NULL; |
| 247 | |
| 248 | is_progressive = !!(avctx->flags & CODEC_FLAG_INTERLACED_DCT); |
| 249 | switch (avctx->pix_fmt) { |
| 250 | case AV_PIX_FMT_RGBA64BE: |
| 251 | bit_depth = 16; |
| 252 | color_type = PNG_COLOR_TYPE_RGB_ALPHA; |
| 253 | break; |
| 254 | case AV_PIX_FMT_RGB48BE: |
| 255 | bit_depth = 16; |
| 256 | color_type = PNG_COLOR_TYPE_RGB; |
| 257 | break; |
| 258 | case AV_PIX_FMT_RGBA: |
| 259 | bit_depth = 8; |
| 260 | color_type = PNG_COLOR_TYPE_RGB_ALPHA; |
| 261 | break; |
| 262 | case AV_PIX_FMT_RGB24: |
| 263 | bit_depth = 8; |
| 264 | color_type = PNG_COLOR_TYPE_RGB; |
| 265 | break; |
| 266 | case AV_PIX_FMT_GRAY16BE: |
| 267 | bit_depth = 16; |
| 268 | color_type = PNG_COLOR_TYPE_GRAY; |
| 269 | break; |
| 270 | case AV_PIX_FMT_GRAY8: |
| 271 | bit_depth = 8; |
| 272 | color_type = PNG_COLOR_TYPE_GRAY; |
| 273 | break; |
| 274 | case AV_PIX_FMT_GRAY8A: |
| 275 | bit_depth = 8; |
| 276 | color_type = PNG_COLOR_TYPE_GRAY_ALPHA; |
| 277 | break; |
| 278 | case AV_PIX_FMT_MONOBLACK: |
| 279 | bit_depth = 1; |
| 280 | color_type = PNG_COLOR_TYPE_GRAY; |
| 281 | break; |
| 282 | case AV_PIX_FMT_PAL8: |
| 283 | bit_depth = 8; |
| 284 | color_type = PNG_COLOR_TYPE_PALETTE; |
| 285 | break; |
| 286 | default: |
| 287 | return -1; |
| 288 | } |
| 289 | bits_per_pixel = ff_png_get_nb_channels(color_type) * bit_depth; |
| 290 | row_size = (avctx->width * bits_per_pixel + 7) >> 3; |
| 291 | |
| 292 | s->zstream.zalloc = ff_png_zalloc; |
| 293 | s->zstream.zfree = ff_png_zfree; |
| 294 | s->zstream.opaque = NULL; |
| 295 | compression_level = avctx->compression_level == FF_COMPRESSION_DEFAULT |
| 296 | ? Z_DEFAULT_COMPRESSION |
| 297 | : av_clip(avctx->compression_level, 0, 9); |
| 298 | ret = deflateInit2(&s->zstream, compression_level, |
| 299 | Z_DEFLATED, 15, 8, Z_DEFAULT_STRATEGY); |
| 300 | if (ret != Z_OK) |
| 301 | return -1; |
| 302 | |
| 303 | enc_row_size = deflateBound(&s->zstream, row_size); |
| 304 | max_packet_size = avctx->height * (int64_t)(enc_row_size + |
| 305 | ((enc_row_size + IOBUF_SIZE - 1) / IOBUF_SIZE) * 12) |
| 306 | + FF_MIN_BUFFER_SIZE; |
| 307 | if (max_packet_size > INT_MAX) |
| 308 | return AVERROR(ENOMEM); |
| 309 | if ((ret = ff_alloc_packet2(avctx, pkt, max_packet_size)) < 0) |
| 310 | return ret; |
| 311 | |
| 312 | s->bytestream_start = |
| 313 | s->bytestream = pkt->data; |
| 314 | s->bytestream_end = pkt->data + pkt->size; |
| 315 | |
| 316 | crow_base = av_malloc((row_size + 32) << (s->filter_type == PNG_FILTER_VALUE_MIXED)); |
| 317 | if (!crow_base) |
| 318 | goto fail; |
| 319 | // pixel data should be aligned, but there's a control byte before it |
| 320 | crow_buf = crow_base + 15; |
| 321 | if (is_progressive) { |
| 322 | progressive_buf = av_malloc(row_size + 1); |
| 323 | if (!progressive_buf) |
| 324 | goto fail; |
| 325 | } |
| 326 | if (is_progressive) { |
| 327 | top_buf = av_malloc(row_size + 1); |
| 328 | if (!top_buf) |
| 329 | goto fail; |
| 330 | } |
| 331 | |
| 332 | /* write png header */ |
| 333 | AV_WB64(s->bytestream, PNGSIG); |
| 334 | s->bytestream += 8; |
| 335 | |
| 336 | AV_WB32(s->buf, avctx->width); |
| 337 | AV_WB32(s->buf + 4, avctx->height); |
| 338 | s->buf[8] = bit_depth; |
| 339 | s->buf[9] = color_type; |
| 340 | s->buf[10] = 0; /* compression type */ |
| 341 | s->buf[11] = 0; /* filter type */ |
| 342 | s->buf[12] = is_progressive; /* interlace type */ |
| 343 | |
| 344 | png_write_chunk(&s->bytestream, MKTAG('I', 'H', 'D', 'R'), s->buf, 13); |
| 345 | |
| 346 | if (s->dpm) { |
| 347 | AV_WB32(s->buf, s->dpm); |
| 348 | AV_WB32(s->buf + 4, s->dpm); |
| 349 | s->buf[8] = 1; /* unit specifier is meter */ |
| 350 | } else { |
| 351 | AV_WB32(s->buf, avctx->sample_aspect_ratio.num); |
| 352 | AV_WB32(s->buf + 4, avctx->sample_aspect_ratio.den); |
| 353 | s->buf[8] = 0; /* unit specifier is unknown */ |
| 354 | } |
| 355 | png_write_chunk(&s->bytestream, MKTAG('p', 'H', 'Y', 's'), s->buf, 9); |
| 356 | |
| 357 | /* put the palette if needed */ |
| 358 | if (color_type == PNG_COLOR_TYPE_PALETTE) { |
| 359 | int has_alpha, alpha, i; |
| 360 | unsigned int v; |
| 361 | uint32_t *palette; |
| 362 | uint8_t *alpha_ptr; |
| 363 | |
| 364 | palette = (uint32_t *)p->data[1]; |
| 365 | ptr = s->buf; |
| 366 | alpha_ptr = s->buf + 256 * 3; |
| 367 | has_alpha = 0; |
| 368 | for (i = 0; i < 256; i++) { |
| 369 | v = palette[i]; |
| 370 | alpha = v >> 24; |
| 371 | if (alpha != 0xff) |
| 372 | has_alpha = 1; |
| 373 | *alpha_ptr++ = alpha; |
| 374 | bytestream_put_be24(&ptr, v); |
| 375 | } |
| 376 | png_write_chunk(&s->bytestream, |
| 377 | MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3); |
| 378 | if (has_alpha) { |
| 379 | png_write_chunk(&s->bytestream, |
| 380 | MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256); |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | /* now put each row */ |
| 385 | s->zstream.avail_out = IOBUF_SIZE; |
| 386 | s->zstream.next_out = s->buf; |
| 387 | if (is_progressive) { |
| 388 | int pass; |
| 389 | |
| 390 | for (pass = 0; pass < NB_PASSES; pass++) { |
| 391 | /* NOTE: a pass is completely omitted if no pixels would be |
| 392 | * output */ |
| 393 | pass_row_size = ff_png_pass_row_size(pass, bits_per_pixel, avctx->width); |
| 394 | if (pass_row_size > 0) { |
| 395 | top = NULL; |
| 396 | for (y = 0; y < avctx->height; y++) |
| 397 | if ((ff_png_pass_ymask[pass] << (y & 7)) & 0x80) { |
| 398 | ptr = p->data[0] + y * p->linesize[0]; |
| 399 | FFSWAP(uint8_t *, progressive_buf, top_buf); |
| 400 | png_get_interlaced_row(progressive_buf, pass_row_size, |
| 401 | bits_per_pixel, pass, |
| 402 | ptr, avctx->width); |
| 403 | crow = png_choose_filter(s, crow_buf, progressive_buf, |
| 404 | top, pass_row_size, bits_per_pixel >> 3); |
| 405 | png_write_row(s, crow, pass_row_size + 1); |
| 406 | top = progressive_buf; |
| 407 | } |
| 408 | } |
| 409 | } |
| 410 | } else { |
| 411 | top = NULL; |
| 412 | for (y = 0; y < avctx->height; y++) { |
| 413 | ptr = p->data[0] + y * p->linesize[0]; |
| 414 | crow = png_choose_filter(s, crow_buf, ptr, top, |
| 415 | row_size, bits_per_pixel >> 3); |
| 416 | png_write_row(s, crow, row_size + 1); |
| 417 | top = ptr; |
| 418 | } |
| 419 | } |
| 420 | /* compress last bytes */ |
| 421 | for (;;) { |
| 422 | ret = deflate(&s->zstream, Z_FINISH); |
| 423 | if (ret == Z_OK || ret == Z_STREAM_END) { |
| 424 | len = IOBUF_SIZE - s->zstream.avail_out; |
| 425 | if (len > 0 && s->bytestream_end - s->bytestream > len + 100) { |
| 426 | png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, len); |
| 427 | } |
| 428 | s->zstream.avail_out = IOBUF_SIZE; |
| 429 | s->zstream.next_out = s->buf; |
| 430 | if (ret == Z_STREAM_END) |
| 431 | break; |
| 432 | } else { |
| 433 | goto fail; |
| 434 | } |
| 435 | } |
| 436 | png_write_chunk(&s->bytestream, MKTAG('I', 'E', 'N', 'D'), NULL, 0); |
| 437 | |
| 438 | pkt->size = s->bytestream - s->bytestream_start; |
| 439 | pkt->flags |= AV_PKT_FLAG_KEY; |
| 440 | *got_packet = 1; |
| 441 | ret = 0; |
| 442 | |
| 443 | the_end: |
| 444 | av_free(crow_base); |
| 445 | av_free(progressive_buf); |
| 446 | av_free(top_buf); |
| 447 | deflateEnd(&s->zstream); |
| 448 | return ret; |
| 449 | fail: |
| 450 | ret = -1; |
| 451 | goto the_end; |
| 452 | } |
| 453 | |
| 454 | static av_cold int png_enc_init(AVCodecContext *avctx) |
| 455 | { |
| 456 | PNGEncContext *s = avctx->priv_data; |
| 457 | |
| 458 | switch (avctx->pix_fmt) { |
| 459 | case AV_PIX_FMT_RGBA: |
| 460 | avctx->bits_per_coded_sample = 32; |
| 461 | break; |
| 462 | case AV_PIX_FMT_RGB24: |
| 463 | avctx->bits_per_coded_sample = 24; |
| 464 | break; |
| 465 | case AV_PIX_FMT_GRAY8: |
| 466 | avctx->bits_per_coded_sample = 0x28; |
| 467 | break; |
| 468 | case AV_PIX_FMT_MONOBLACK: |
| 469 | avctx->bits_per_coded_sample = 1; |
| 470 | break; |
| 471 | case AV_PIX_FMT_PAL8: |
| 472 | avctx->bits_per_coded_sample = 8; |
| 473 | } |
| 474 | |
| 475 | avctx->coded_frame = av_frame_alloc(); |
| 476 | if (!avctx->coded_frame) |
| 477 | return AVERROR(ENOMEM); |
| 478 | |
| 479 | avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; |
| 480 | avctx->coded_frame->key_frame = 1; |
| 481 | |
| 482 | ff_huffyuvencdsp_init(&s->hdsp); |
| 483 | |
| 484 | s->filter_type = av_clip(avctx->prediction_method, |
| 485 | PNG_FILTER_VALUE_NONE, |
| 486 | PNG_FILTER_VALUE_MIXED); |
| 487 | if (avctx->pix_fmt == AV_PIX_FMT_MONOBLACK) |
| 488 | s->filter_type = PNG_FILTER_VALUE_NONE; |
| 489 | |
| 490 | if (s->dpi && s->dpm) { |
| 491 | av_log(avctx, AV_LOG_ERROR, "Only one of 'dpi' or 'dpm' options should be set\n"); |
| 492 | return AVERROR(EINVAL); |
| 493 | } else if (s->dpi) { |
| 494 | s->dpm = s->dpi * 10000 / 254; |
| 495 | } |
| 496 | |
| 497 | return 0; |
| 498 | } |
| 499 | |
| 500 | static av_cold int png_enc_close(AVCodecContext *avctx) |
| 501 | { |
| 502 | av_frame_free(&avctx->coded_frame); |
| 503 | return 0; |
| 504 | } |
| 505 | |
| 506 | #define OFFSET(x) offsetof(PNGEncContext, x) |
| 507 | #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM |
| 508 | static const AVOption options[] = { |
| 509 | {"dpi", "Set image resolution (in dots per inch)", OFFSET(dpi), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 0x10000, VE}, |
| 510 | {"dpm", "Set image resolution (in dots per meter)", OFFSET(dpm), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 0x10000, VE}, |
| 511 | { NULL } |
| 512 | }; |
| 513 | |
| 514 | static const AVClass pngenc_class = { |
| 515 | .class_name = "PNG encoder", |
| 516 | .item_name = av_default_item_name, |
| 517 | .option = options, |
| 518 | .version = LIBAVUTIL_VERSION_INT, |
| 519 | }; |
| 520 | |
| 521 | AVCodec ff_png_encoder = { |
| 522 | .name = "png", |
| 523 | .long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"), |
| 524 | .type = AVMEDIA_TYPE_VIDEO, |
| 525 | .id = AV_CODEC_ID_PNG, |
| 526 | .priv_data_size = sizeof(PNGEncContext), |
| 527 | .init = png_enc_init, |
| 528 | .close = png_enc_close, |
| 529 | .encode2 = encode_frame, |
| 530 | .capabilities = CODEC_CAP_FRAME_THREADS | CODEC_CAP_INTRA_ONLY, |
| 531 | .pix_fmts = (const enum AVPixelFormat[]) { |
| 532 | AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA, |
| 533 | AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGBA64BE, |
| 534 | AV_PIX_FMT_PAL8, |
| 535 | AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A, |
| 536 | AV_PIX_FMT_GRAY16BE, |
| 537 | AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE |
| 538 | }, |
| 539 | .priv_class = &pngenc_class, |
| 540 | }; |