4 * Copyright (c) 2002-2003 Michael Niedermayer <michaelni@gmx.at>
6 * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
9 * This file is part of Libav.
11 * Libav is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2.1 of the License, or (at your option) any later version.
16 * Libav is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with Libav; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
34 #include "huffyuvdsp.h"
37 #define classic_shift_luma_table_size 42
38 static const unsigned char classic_shift_luma[classic_shift_luma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {
39 34, 36, 35, 69, 135, 232, 9, 16, 10, 24, 11, 23, 12, 16, 13, 10,
40 14, 8, 15, 8, 16, 8, 17, 20, 16, 10, 207, 206, 205, 236, 11, 8,
41 10, 21, 9, 23, 8, 8, 199, 70, 69, 68, 0
44 #define classic_shift_chroma_table_size 59
45 static const unsigned char classic_shift_chroma[classic_shift_chroma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {
46 66, 36, 37, 38, 39, 40, 41, 75, 76, 77, 110, 239, 144, 81, 82, 83,
47 84, 85, 118, 183, 56, 57, 88, 89, 56, 89, 154, 57, 58, 57, 26, 141,
48 57, 56, 58, 57, 58, 57, 184, 119, 214, 245, 116, 83, 82, 49, 80, 79,
49 78, 77, 44, 75, 41, 40, 39, 38, 37, 36, 34, 0
52 static const unsigned char classic_add_luma[256] = {
53 3, 9, 5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,
54 73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,
55 68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,
56 35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,
57 37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,
58 35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,
59 27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,
60 15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,
61 12, 17, 19, 13, 4, 9, 2, 11, 1, 7, 8, 0, 16, 3, 14, 6,
62 12, 10, 5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,
63 18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,
64 28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,
65 28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,
66 62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,
67 54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,
68 46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13, 7, 8,
71 static const unsigned char classic_add_chroma[256] = {
72 3, 1, 2, 2, 2, 2, 3, 3, 7, 5, 7, 5, 8, 6, 11, 9,
73 7, 13, 11, 10, 9, 8, 7, 5, 9, 7, 6, 4, 7, 5, 8, 7,
74 11, 8, 13, 11, 19, 15, 22, 23, 20, 33, 32, 28, 27, 29, 51, 77,
75 43, 45, 76, 81, 46, 82, 75, 55, 56, 144, 58, 80, 60, 74, 147, 63,
76 143, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
77 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 27, 30, 21, 22,
78 17, 14, 5, 6, 100, 54, 47, 50, 51, 53, 106, 107, 108, 109, 110, 111,
79 112, 113, 114, 115, 4, 117, 118, 92, 94, 121, 122, 3, 124, 103, 2, 1,
80 0, 129, 130, 131, 120, 119, 126, 125, 136, 137, 138, 139, 140, 141, 142, 134,
81 135, 132, 133, 104, 64, 101, 62, 57, 102, 95, 93, 59, 61, 28, 97, 96,
82 52, 49, 48, 29, 32, 25, 24, 46, 23, 98, 45, 44, 43, 20, 42, 41,
83 19, 18, 99, 40, 15, 39, 38, 16, 13, 12, 11, 37, 10, 9, 8, 36,
84 7, 128, 127, 105, 123, 116, 35, 34, 33, 145, 31, 79, 42, 146, 78, 26,
85 83, 48, 49, 50, 44, 47, 26, 31, 30, 18, 17, 19, 21, 24, 25, 13,
86 14, 16, 17, 18, 20, 21, 12, 14, 15, 9, 10, 6, 9, 6, 5, 8,
87 6, 12, 8, 10, 7, 9, 6, 4, 6, 2, 2, 3, 3, 3, 3, 2,
90 static int read_len_table(uint8_t *dst, GetBitContext *gb)
94 for (i = 0; i < 256;) {
95 repeat = get_bits(gb, 3);
96 val = get_bits(gb, 5);
98 repeat = get_bits(gb, 8);
99 if (i + repeat > 256 || get_bits_left(gb) < 0) {
100 av_log(NULL, AV_LOG_ERROR, "Error reading huffman table\n");
109 static void generate_joint_tables(HYuvContext *s)
111 uint16_t symbols[1 << VLC_BITS];
112 uint16_t bits[1 << VLC_BITS];
113 uint8_t len[1 << VLC_BITS];
114 if (s->bitstream_bpp < 24) {
116 for (p = 0; p < 3; p++) {
117 for (i = y = 0; y < 256; y++) {
118 int len0 = s->len[0][y];
119 int limit = VLC_BITS - len0;
122 for (u = 0; u < 256; u++) {
123 int len1 = s->len[p][u];
126 len[i] = len0 + len1;
127 bits[i] = (s->bits[0][y] << len1) + s->bits[p][u];
128 symbols[i] = (y << 8) + u;
129 if (symbols[i] != 0xffff) // reserved to mean "invalid"
133 ff_free_vlc(&s->vlc[3 + p]);
134 ff_init_vlc_sparse(&s->vlc[3 + p], VLC_BITS, i, len, 1, 1,
135 bits, 2, 2, symbols, 2, 2, 0);
138 uint8_t (*map)[4] = (uint8_t(*)[4]) s->pix_bgr_map;
139 int i, b, g, r, code;
140 int p0 = s->decorrelate;
141 int p1 = !s->decorrelate;
142 /* Restrict the range to +/-16 because that's pretty much guaranteed
143 * to cover all the combinations that fit in 11 bits total, and it
144 * does not matter if we miss a few rare codes. */
145 for (i = 0, g = -16; g < 16; g++) {
146 int len0 = s->len[p0][g & 255];
147 int limit0 = VLC_BITS - len0;
150 for (b = -16; b < 16; b++) {
151 int len1 = s->len[p1][b & 255];
152 int limit1 = limit0 - len1;
155 code = (s->bits[p0][g & 255] << len1) + s->bits[p1][b & 255];
156 for (r = -16; r < 16; r++) {
157 int len2 = s->len[2][r & 255];
160 len[i] = len0 + len1 + len2;
161 bits[i] = (code << len2) + s->bits[2][r & 255];
162 if (s->decorrelate) {
175 ff_free_vlc(&s->vlc[3]);
176 init_vlc(&s->vlc[3], VLC_BITS, i, len, 1, 1, bits, 2, 2, 0);
180 static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)
185 init_get_bits(&gb, src, length * 8);
187 for (i = 0; i < 3; i++) {
188 if (read_len_table(s->len[i], &gb) < 0)
190 if (ff_huffyuv_generate_bits_table(s->bits[i], s->len[i]) < 0)
192 ff_free_vlc(&s->vlc[i]);
193 init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
194 s->bits[i], 4, 4, 0);
197 generate_joint_tables(s);
199 return (get_bits_count(&gb) + 7) / 8;
202 static int read_old_huffman_tables(HYuvContext *s)
207 init_get_bits(&gb, classic_shift_luma,
208 classic_shift_luma_table_size * 8);
209 if (read_len_table(s->len[0], &gb) < 0)
212 init_get_bits(&gb, classic_shift_chroma,
213 classic_shift_chroma_table_size * 8);
214 if (read_len_table(s->len[1], &gb) < 0)
217 for (i = 0; i < 256; i++)
218 s->bits[0][i] = classic_add_luma[i];
219 for (i = 0; i < 256; i++)
220 s->bits[1][i] = classic_add_chroma[i];
222 if (s->bitstream_bpp >= 24) {
223 memcpy(s->bits[1], s->bits[0], 256 * sizeof(uint32_t));
224 memcpy(s->len[1], s->len[0], 256 * sizeof(uint8_t));
226 memcpy(s->bits[2], s->bits[1], 256 * sizeof(uint32_t));
227 memcpy(s->len[2], s->len[1], 256 * sizeof(uint8_t));
229 for (i = 0; i < 3; i++) {
230 ff_free_vlc(&s->vlc[i]);
231 init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
232 s->bits[i], 4, 4, 0);
235 generate_joint_tables(s);
240 static av_cold int decode_init(AVCodecContext *avctx)
242 HYuvContext *s = avctx->priv_data;
244 ff_huffyuv_common_init(avctx);
245 ff_huffyuvdsp_init(&s->hdsp);
246 memset(s->vlc, 0, 3 * sizeof(VLC));
248 s->interlaced = s->height > 288;
251 if (avctx->extradata_size) {
252 if ((avctx->bits_per_coded_sample & 7) &&
253 avctx->bits_per_coded_sample != 12)
254 s->version = 1; // do such files exist at all?
260 if (s->version == 2) {
261 int method, interlace;
263 if (avctx->extradata_size < 4)
266 method = avctx->extradata[0];
267 s->decorrelate = method & 64 ? 1 : 0;
268 s->predictor = method & 63;
269 s->bitstream_bpp = avctx->extradata[1];
270 if (s->bitstream_bpp == 0)
271 s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
272 interlace = (avctx->extradata[2] & 0x30) >> 4;
273 s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
274 s->context = avctx->extradata[2] & 0x40 ? 1 : 0;
276 if (read_huffman_tables(s, avctx->extradata + 4,
277 avctx->extradata_size - 4) < 0)
280 switch (avctx->bits_per_coded_sample & 7) {
290 s->predictor = PLANE;
291 s->decorrelate = avctx->bits_per_coded_sample >= 24;
294 s->predictor = MEDIAN;
298 s->predictor = LEFT; // OLD
302 s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
305 if (read_old_huffman_tables(s) < 0)
309 switch (s->bitstream_bpp) {
311 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
315 avctx->pix_fmt = AV_PIX_FMT_YUYV422;
317 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
322 avctx->pix_fmt = AV_PIX_FMT_RGB32;
324 avctx->pix_fmt = AV_PIX_FMT_BGR24;
327 return AVERROR_INVALIDDATA;
330 ff_huffyuv_alloc_temp(s);
335 static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
337 HYuvContext *s = avctx->priv_data;
340 ff_huffyuv_alloc_temp(s);
342 for (i = 0; i < 6; i++)
343 s->vlc[i].table = NULL;
345 if (s->version == 2) {
346 if (read_huffman_tables(s, avctx->extradata + 4,
347 avctx->extradata_size) < 0)
350 if (read_old_huffman_tables(s) < 0)
357 /* TODO instead of restarting the read when the code isn't in the first level
358 * of the joint table, jump into the 2nd level of the individual table. */
359 #define READ_2PIX(dst0, dst1, plane1) \
361 uint16_t code = get_vlc2(&s->gb, s->vlc[3 + plane1].table, \
363 if (code != 0xffff) { \
367 dst0 = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3); \
368 dst1 = get_vlc2(&s->gb, s->vlc[plane1].table, VLC_BITS, 3); \
372 static void decode_422_bitstream(HYuvContext *s, int count)
378 if (count >= (get_bits_left(&s->gb)) / (31 * 4)) {
379 for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
380 READ_2PIX(s->temp[0][2 * i], s->temp[1][i], 1);
381 READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
384 for (i = 0; i < count; i++) {
385 READ_2PIX(s->temp[0][2 * i], s->temp[1][i], 1);
386 READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
391 static void decode_gray_bitstream(HYuvContext *s, int count)
397 if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {
398 for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
399 READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
402 for (i = 0; i < count; i++) {
403 READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
408 static av_always_inline void decode_bgr_1(HYuvContext *s, int count,
409 int decorrelate, int alpha)
412 for (i = 0; i < count; i++) {
413 int code = get_vlc2(&s->gb, s->vlc[3].table, VLC_BITS, 1);
415 *(uint32_t *) &s->temp[0][4 * i] = s->pix_bgr_map[code];
416 } else if (decorrelate) {
417 s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
418 s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3) +
419 s->temp[0][4 * i + G];
420 s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3) +
421 s->temp[0][4 * i + G];
423 s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);
424 s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
425 s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
428 s->temp[0][4 * i + A] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
432 static void decode_bgr_bitstream(HYuvContext *s, int count)
434 if (s->decorrelate) {
435 if (s->bitstream_bpp == 24)
436 decode_bgr_1(s, count, 1, 0);
438 decode_bgr_1(s, count, 1, 1);
440 if (s->bitstream_bpp == 24)
441 decode_bgr_1(s, count, 0, 0);
443 decode_bgr_1(s, count, 0, 1);
447 static void draw_slice(HYuvContext *s, AVFrame *frame, int y)
450 int offset[AV_NUM_DATA_POINTERS];
452 if (s->avctx->draw_horiz_band == NULL)
455 h = y - s->last_slice_end;
458 if (s->bitstream_bpp == 12)
463 offset[0] = frame->linesize[0] * y;
464 offset[1] = frame->linesize[1] * cy;
465 offset[2] = frame->linesize[2] * cy;
466 for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
470 s->avctx->draw_horiz_band(s->avctx, frame, offset, y, 3, h);
472 s->last_slice_end = y + h;
475 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
478 const uint8_t *buf = avpkt->data;
479 int buf_size = avpkt->size;
480 HYuvContext *s = avctx->priv_data;
481 const int width = s->width;
482 const int width2 = s->width >> 1;
483 const int height = s->height;
484 int fake_ystride, fake_ustride, fake_vstride;
485 ThreadFrame frame = { .f = data };
486 AVFrame *const p = data;
489 av_fast_malloc(&s->bitstream_buffer,
490 &s->bitstream_buffer_size,
491 buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
492 if (!s->bitstream_buffer)
493 return AVERROR(ENOMEM);
495 memset(s->bitstream_buffer + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
496 s->bdsp.bswap_buf((uint32_t *) s->bitstream_buffer,
497 (const uint32_t *) buf, buf_size / 4);
499 if (ff_thread_get_buffer(avctx, &frame, 0) < 0) {
500 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
505 table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);
510 if ((unsigned) (buf_size - table_size) >= INT_MAX / 8)
513 init_get_bits(&s->gb, s->bitstream_buffer + table_size,
514 (buf_size - table_size) * 8);
516 fake_ystride = s->interlaced ? p->linesize[0] * 2 : p->linesize[0];
517 fake_ustride = s->interlaced ? p->linesize[1] * 2 : p->linesize[1];
518 fake_vstride = s->interlaced ? p->linesize[2] * 2 : p->linesize[2];
520 s->last_slice_end = 0;
522 if (s->bitstream_bpp < 24) {
524 int lefty, leftu, leftv;
525 int lefttopy, lefttopu, lefttopv;
528 p->data[0][3] = get_bits(&s->gb, 8);
529 p->data[0][2] = get_bits(&s->gb, 8);
530 p->data[0][1] = get_bits(&s->gb, 8);
531 p->data[0][0] = get_bits(&s->gb, 8);
533 av_log(avctx, AV_LOG_ERROR,
534 "YUY2 output is not implemented yet\n");
538 p->data[2][0] = get_bits(&s->gb, 8);
540 p->data[0][1] = get_bits(&s->gb, 8);
542 p->data[1][0] = get_bits(&s->gb, 8);
543 p->data[0][0] = get_bits(&s->gb, 8);
545 switch (s->predictor) {
548 decode_422_bitstream(s, width - 2);
549 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0],
551 if (!(s->flags & CODEC_FLAG_GRAY)) {
552 leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
553 leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
556 for (cy = y = 1; y < s->height; y++, cy++) {
557 uint8_t *ydst, *udst, *vdst;
559 if (s->bitstream_bpp == 12) {
560 decode_gray_bitstream(s, width);
562 ydst = p->data[0] + p->linesize[0] * y;
564 lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0],
566 if (s->predictor == PLANE) {
567 if (y > s->interlaced)
568 s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);
577 ydst = p->data[0] + p->linesize[0] * y;
578 udst = p->data[1] + p->linesize[1] * cy;
579 vdst = p->data[2] + p->linesize[2] * cy;
581 decode_422_bitstream(s, width);
582 lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0],
584 if (!(s->flags & CODEC_FLAG_GRAY)) {
585 leftu = s->hdsp.add_hfyu_left_pred(udst, s->temp[1], width2, leftu);
586 leftv = s->hdsp.add_hfyu_left_pred(vdst, s->temp[2], width2, leftv);
588 if (s->predictor == PLANE) {
589 if (cy > s->interlaced) {
590 s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);
591 if (!(s->flags & CODEC_FLAG_GRAY)) {
592 s->hdsp.add_bytes(udst, udst - fake_ustride, width2);
593 s->hdsp.add_bytes(vdst, vdst - fake_vstride, width2);
598 draw_slice(s, p, height);
602 /* first line except first 2 pixels is left predicted */
603 decode_422_bitstream(s, width - 2);
604 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0],
606 if (!(s->flags & CODEC_FLAG_GRAY)) {
607 leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
608 leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
613 /* second line is left predicted for interlaced case */
615 decode_422_bitstream(s, width);
616 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + p->linesize[0],
617 s->temp[0], width, lefty);
618 if (!(s->flags & CODEC_FLAG_GRAY)) {
619 leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);
620 leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);
626 /* next 4 pixels are left predicted too */
627 decode_422_bitstream(s, 4);
628 lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + fake_ystride,
629 s->temp[0], 4, lefty);
630 if (!(s->flags & CODEC_FLAG_GRAY)) {
631 leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + fake_ustride, s->temp[1], 2, leftu);
632 leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + fake_vstride, s->temp[2], 2, leftv);
635 /* next line except the first 4 pixels is median predicted */
636 lefttopy = p->data[0][3];
637 decode_422_bitstream(s, width - 4);
638 s->hdsp.add_hfyu_median_pred(p->data[0] + fake_ystride + 4,
639 p->data[0] + 4, s->temp[0],
640 width - 4, &lefty, &lefttopy);
641 if (!(s->flags & CODEC_FLAG_GRAY)) {
642 lefttopu = p->data[1][1];
643 lefttopv = p->data[2][1];
644 s->hdsp.add_hfyu_median_pred(p->data[1] + fake_ustride + 2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);
645 s->hdsp.add_hfyu_median_pred(p->data[2] + fake_vstride + 2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);
650 for (; y < height; y++, cy++) {
651 uint8_t *ydst, *udst, *vdst;
653 if (s->bitstream_bpp == 12) {
655 decode_gray_bitstream(s, width);
656 ydst = p->data[0] + p->linesize[0] * y;
657 s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride,
667 decode_422_bitstream(s, width);
669 ydst = p->data[0] + p->linesize[0] * y;
670 udst = p->data[1] + p->linesize[1] * cy;
671 vdst = p->data[2] + p->linesize[2] * cy;
673 s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride,
676 if (!(s->flags & CODEC_FLAG_GRAY)) {
677 s->hdsp.add_hfyu_median_pred(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);
678 s->hdsp.add_hfyu_median_pred(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);
682 draw_slice(s, p, height);
688 int leftr, leftg, leftb, lefta;
689 const int last_line = (height - 1) * p->linesize[0];
691 if (s->bitstream_bpp == 32) {
692 lefta = p->data[0][last_line + A] = get_bits(&s->gb, 8);
693 leftr = p->data[0][last_line + R] = get_bits(&s->gb, 8);
694 leftg = p->data[0][last_line + G] = get_bits(&s->gb, 8);
695 leftb = p->data[0][last_line + B] = get_bits(&s->gb, 8);
697 leftr = p->data[0][last_line + R] = get_bits(&s->gb, 8);
698 leftg = p->data[0][last_line + G] = get_bits(&s->gb, 8);
699 leftb = p->data[0][last_line + B] = get_bits(&s->gb, 8);
700 lefta = p->data[0][last_line + A] = 255;
701 skip_bits(&s->gb, 8);
705 switch (s->predictor) {
708 decode_bgr_bitstream(s, width - 1);
709 s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + last_line + 4,
710 s->temp[0], width - 1, &leftr,
711 &leftg, &leftb, &lefta);
713 for (y = s->height - 2; y >= 0; y--) { // Yes it is stored upside down.
714 decode_bgr_bitstream(s, width);
716 s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + p->linesize[0] * y,
717 s->temp[0], width, &leftr,
718 &leftg, &leftb, &lefta);
719 if (s->predictor == PLANE) {
720 if (s->bitstream_bpp != 32)
722 if ((y & s->interlaced) == 0 &&
723 y < s->height - 1 - s->interlaced) {
724 s->hdsp.add_bytes(p->data[0] + p->linesize[0] * y,
725 p->data[0] + p->linesize[0] * y +
726 fake_ystride, fake_ystride);
730 // just 1 large slice as this is not possible in reverse order
731 draw_slice(s, p, height);
734 av_log(avctx, AV_LOG_ERROR,
735 "prediction type not supported!\n");
738 av_log(avctx, AV_LOG_ERROR,
739 "BGR24 output is not implemented yet\n");
747 return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;
750 static av_cold int decode_end(AVCodecContext *avctx)
752 HYuvContext *s = avctx->priv_data;
755 ff_huffyuv_common_end(s);
756 av_freep(&s->bitstream_buffer);
758 for (i = 0; i < 6; i++)
759 ff_free_vlc(&s->vlc[i]);
764 AVCodec ff_huffyuv_decoder = {
766 .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),
767 .type = AVMEDIA_TYPE_VIDEO,
768 .id = AV_CODEC_ID_HUFFYUV,
769 .priv_data_size = sizeof(HYuvContext),
772 .decode = decode_frame,
773 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
774 CODEC_CAP_FRAME_THREADS,
775 .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
778 #if CONFIG_FFVHUFF_DECODER
779 AVCodec ff_ffvhuff_decoder = {
781 .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),
782 .type = AVMEDIA_TYPE_VIDEO,
783 .id = AV_CODEC_ID_FFVHUFF,
784 .priv_data_size = sizeof(HYuvContext),
787 .decode = decode_frame,
788 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
789 CODEC_CAP_FRAME_THREADS,
790 .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
792 #endif /* CONFIG_FFVHUFF_DECODER */