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
36 #define classic_shift_luma_table_size 42
37 static const unsigned char classic_shift_luma[classic_shift_luma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {
38 34,36,35,69,135,232,9,16,10,24,11,23,12,16,13,10,14,8,15,8,
39 16,8,17,20,16,10,207,206,205,236,11,8,10,21,9,23,8,8,199,70,
43 #define classic_shift_chroma_table_size 59
44 static const unsigned char classic_shift_chroma[classic_shift_chroma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {
45 66,36,37,38,39,40,41,75,76,77,110,239,144,81,82,83,84,85,118,183,
46 56,57,88,89,56,89,154,57,58,57,26,141,57,56,58,57,58,57,184,119,
47 214,245,116,83,82,49,80,79,78,77,44,75,41,40,39,38,37,36,34, 0
50 static const unsigned char classic_add_luma[256] = {
51 3, 9, 5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,
52 73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,
53 68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,
54 35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,
55 37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,
56 35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,
57 27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,
58 15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,
59 12, 17, 19, 13, 4, 9, 2, 11, 1, 7, 8, 0, 16, 3, 14, 6,
60 12, 10, 5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,
61 18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,
62 28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,
63 28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,
64 62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,
65 54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,
66 46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13, 7, 8,
69 static const unsigned char classic_add_chroma[256] = {
70 3, 1, 2, 2, 2, 2, 3, 3, 7, 5, 7, 5, 8, 6, 11, 9,
71 7, 13, 11, 10, 9, 8, 7, 5, 9, 7, 6, 4, 7, 5, 8, 7,
72 11, 8, 13, 11, 19, 15, 22, 23, 20, 33, 32, 28, 27, 29, 51, 77,
73 43, 45, 76, 81, 46, 82, 75, 55, 56,144, 58, 80, 60, 74,147, 63,
74 143, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
75 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 27, 30, 21, 22,
76 17, 14, 5, 6,100, 54, 47, 50, 51, 53,106,107,108,109,110,111,
77 112,113,114,115, 4,117,118, 92, 94,121,122, 3,124,103, 2, 1,
78 0,129,130,131,120,119,126,125,136,137,138,139,140,141,142,134,
79 135,132,133,104, 64,101, 62, 57,102, 95, 93, 59, 61, 28, 97, 96,
80 52, 49, 48, 29, 32, 25, 24, 46, 23, 98, 45, 44, 43, 20, 42, 41,
81 19, 18, 99, 40, 15, 39, 38, 16, 13, 12, 11, 37, 10, 9, 8, 36,
82 7,128,127,105,123,116, 35, 34, 33,145, 31, 79, 42,146, 78, 26,
83 83, 48, 49, 50, 44, 47, 26, 31, 30, 18, 17, 19, 21, 24, 25, 13,
84 14, 16, 17, 18, 20, 21, 12, 14, 15, 9, 10, 6, 9, 6, 5, 8,
85 6, 12, 8, 10, 7, 9, 6, 4, 6, 2, 2, 3, 3, 3, 3, 2,
88 static int read_len_table(uint8_t *dst, GetBitContext *gb)
92 for (i = 0; i < 256;) {
93 repeat = get_bits(gb, 3);
94 val = get_bits(gb, 5);
96 repeat = get_bits(gb, 8);
97 if (i + repeat > 256 || get_bits_left(gb) < 0) {
98 av_log(NULL, AV_LOG_ERROR, "Error reading huffman table\n");
107 static void generate_joint_tables(HYuvContext *s)
109 uint16_t symbols[1 << VLC_BITS];
110 uint16_t bits[1 << VLC_BITS];
111 uint8_t len[1 << VLC_BITS];
112 if (s->bitstream_bpp < 24) {
114 for (p = 0; p < 3; p++) {
115 for (i = y = 0; y < 256; y++) {
116 int len0 = s->len[0][y];
117 int limit = VLC_BITS - len0;
120 for (u = 0; u < 256; u++) {
121 int len1 = s->len[p][u];
124 len[i] = len0 + len1;
125 bits[i] = (s->bits[0][y] << len1) + s->bits[p][u];
126 symbols[i] = (y << 8) + u;
127 if(symbols[i] != 0xffff) // reserved to mean "invalid"
131 ff_free_vlc(&s->vlc[3 + p]);
132 ff_init_vlc_sparse(&s->vlc[3 + p], VLC_BITS, i, len, 1, 1,
133 bits, 2, 2, symbols, 2, 2, 0);
136 uint8_t (*map)[4] = (uint8_t(*)[4])s->pix_bgr_map;
137 int i, b, g, r, code;
138 int p0 = s->decorrelate;
139 int p1 = !s->decorrelate;
140 // restrict the range to +/-16 because that's pretty much guaranteed to
141 // cover all the combinations that fit in 11 bits total, and it doesn't
142 // matter if we miss a few rare codes.
143 for (i = 0, g = -16; g < 16; g++) {
144 int len0 = s->len[p0][g & 255];
145 int limit0 = VLC_BITS - len0;
148 for (b = -16; b < 16; b++) {
149 int len1 = s->len[p1][b & 255];
150 int limit1 = limit0 - len1;
153 code = (s->bits[p0][g & 255] << len1) + s->bits[p1][b & 255];
154 for (r = -16; r < 16; r++) {
155 int len2 = s->len[2][r & 255];
158 len[i] = len0 + len1 + len2;
159 bits[i] = (code << len2) + s->bits[2][r & 255];
160 if (s->decorrelate) {
173 ff_free_vlc(&s->vlc[3]);
174 init_vlc(&s->vlc[3], VLC_BITS, i, len, 1, 1, bits, 2, 2, 0);
178 static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)
183 init_get_bits(&gb, src, length * 8);
185 for (i = 0; i < 3; i++) {
186 if (read_len_table(s->len[i], &gb) < 0)
188 if (ff_huffyuv_generate_bits_table(s->bits[i], s->len[i]) < 0) {
191 ff_free_vlc(&s->vlc[i]);
192 init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
193 s->bits[i], 4, 4, 0);
196 generate_joint_tables(s);
198 return (get_bits_count(&gb) + 7) / 8;
201 static int read_old_huffman_tables(HYuvContext *s)
206 init_get_bits(&gb, classic_shift_luma,
207 classic_shift_luma_table_size * 8);
208 if (read_len_table(s->len[0], &gb) < 0)
211 init_get_bits(&gb, classic_shift_chroma,
212 classic_shift_chroma_table_size * 8);
213 if (read_len_table(s->len[1], &gb) < 0)
216 for(i=0; i<256; i++) s->bits[0][i] = classic_add_luma [i];
217 for(i=0; i<256; i++) s->bits[1][i] = classic_add_chroma[i];
219 if (s->bitstream_bpp >= 24) {
220 memcpy(s->bits[1], s->bits[0], 256 * sizeof(uint32_t));
221 memcpy(s->len[1] , s->len [0], 256 * sizeof(uint8_t));
223 memcpy(s->bits[2], s->bits[1], 256 * sizeof(uint32_t));
224 memcpy(s->len[2] , s->len [1], 256 * sizeof(uint8_t));
226 for (i = 0; i < 3; i++) {
227 ff_free_vlc(&s->vlc[i]);
228 init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
229 s->bits[i], 4, 4, 0);
232 generate_joint_tables(s);
237 static av_cold int decode_init(AVCodecContext *avctx)
239 HYuvContext *s = avctx->priv_data;
241 ff_huffyuv_common_init(avctx);
242 memset(s->vlc, 0, 3 * sizeof(VLC));
244 s->interlaced = s->height > 288;
248 if (avctx->extradata_size) {
249 if ((avctx->bits_per_coded_sample & 7) &&
250 avctx->bits_per_coded_sample != 12)
251 s->version = 1; // do such files exist at all?
257 if (s->version == 2) {
258 int method, interlace;
260 if (avctx->extradata_size < 4)
263 method = ((uint8_t*)avctx->extradata)[0];
264 s->decorrelate = method & 64 ? 1 : 0;
265 s->predictor = method & 63;
266 s->bitstream_bpp = ((uint8_t*)avctx->extradata)[1];
267 if (s->bitstream_bpp == 0)
268 s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
269 interlace = (((uint8_t*)avctx->extradata)[2] & 0x30) >> 4;
270 s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
271 s->context = ((uint8_t*)avctx->extradata)[2] & 0x40 ? 1 : 0;
273 if ( read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
274 avctx->extradata_size - 4) < 0)
277 switch (avctx->bits_per_coded_sample & 7) {
287 s->predictor = PLANE;
288 s->decorrelate = avctx->bits_per_coded_sample >= 24;
291 s->predictor = MEDIAN;
295 s->predictor = LEFT; //OLD
299 s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
302 if (read_old_huffman_tables(s) < 0)
306 switch (s->bitstream_bpp) {
308 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
312 avctx->pix_fmt = AV_PIX_FMT_YUYV422;
314 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
320 avctx->pix_fmt = AV_PIX_FMT_RGB32;
322 avctx->pix_fmt = AV_PIX_FMT_BGR24;
326 return AVERROR_INVALIDDATA;
329 ff_huffyuv_alloc_temp(s);
334 static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
336 HYuvContext *s = avctx->priv_data;
339 ff_huffyuv_alloc_temp(s);
341 for (i = 0; i < 6; i++)
342 s->vlc[i].table = NULL;
344 if (s->version == 2) {
345 if (read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
346 avctx->extradata_size) < 0)
349 if (read_old_huffman_tables(s) < 0)
356 /* TODO instead of restarting the read when the code isn't in the first level
357 * of the joint table, jump into the 2nd level of the individual table. */
358 #define READ_2PIX(dst0, dst1, plane1){\
359 uint16_t code = get_vlc2(&s->gb, s->vlc[3+plane1].table, VLC_BITS, 1);\
364 dst0 = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);\
365 dst1 = get_vlc2(&s->gb, s->vlc[plane1].table, VLC_BITS, 3);\
369 static void decode_422_bitstream(HYuvContext *s, int count)
375 if (count >= (get_bits_left(&s->gb)) / (31 * 4)) {
376 for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
377 READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
378 READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
381 for (i = 0; i < count; i++) {
382 READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
383 READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
388 static void decode_gray_bitstream(HYuvContext *s, int count)
394 if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {
395 for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
396 READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
399 for(i=0; i<count; i++){
400 READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
405 static av_always_inline void decode_bgr_1(HYuvContext *s, int count,
406 int decorrelate, int alpha)
409 for (i = 0; i < count; i++) {
410 int code = get_vlc2(&s->gb, s->vlc[3].table, VLC_BITS, 1);
412 *(uint32_t*)&s->temp[0][4 * i] = s->pix_bgr_map[code];
413 } else if(decorrelate) {
414 s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
415 s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3) +
416 s->temp[0][4 * i + G];
417 s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3) +
418 s->temp[0][4 * i + G];
420 s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);
421 s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
422 s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
425 s->temp[0][4 * i + A] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
429 static void decode_bgr_bitstream(HYuvContext *s, int count)
431 if (s->decorrelate) {
432 if (s->bitstream_bpp==24)
433 decode_bgr_1(s, count, 1, 0);
435 decode_bgr_1(s, count, 1, 1);
437 if (s->bitstream_bpp==24)
438 decode_bgr_1(s, count, 0, 0);
440 decode_bgr_1(s, count, 0, 1);
444 static void draw_slice(HYuvContext *s, AVFrame *frame, int y)
447 int offset[AV_NUM_DATA_POINTERS];
449 if (s->avctx->draw_horiz_band==NULL)
452 h = y - s->last_slice_end;
455 if (s->bitstream_bpp == 12) {
461 offset[0] = frame->linesize[0] * y;
462 offset[1] = frame->linesize[1] * cy;
463 offset[2] = frame->linesize[2] * cy;
464 for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
468 s->avctx->draw_horiz_band(s->avctx, frame, offset, y, 3, h);
470 s->last_slice_end = y + h;
473 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
476 const uint8_t *buf = avpkt->data;
477 int buf_size = avpkt->size;
478 HYuvContext *s = avctx->priv_data;
479 const int width = s->width;
480 const int width2 = s->width>>1;
481 const int height = s->height;
482 int fake_ystride, fake_ustride, fake_vstride;
483 ThreadFrame frame = { .f = data };
484 AVFrame * const p = data;
487 av_fast_malloc(&s->bitstream_buffer,
488 &s->bitstream_buffer_size,
489 buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
490 if (!s->bitstream_buffer)
491 return AVERROR(ENOMEM);
493 memset(s->bitstream_buffer + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
494 s->dsp.bswap_buf((uint32_t*)s->bitstream_buffer,
495 (const uint32_t*)buf, buf_size / 4);
497 if (ff_thread_get_buffer(avctx, &frame, 0) < 0) {
498 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
503 table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);
508 if ((unsigned)(buf_size-table_size) >= INT_MAX / 8)
511 init_get_bits(&s->gb, s->bitstream_buffer+table_size,
512 (buf_size-table_size) * 8);
514 fake_ystride = s->interlaced ? p->linesize[0] * 2 : p->linesize[0];
515 fake_ustride = s->interlaced ? p->linesize[1] * 2 : p->linesize[1];
516 fake_vstride = s->interlaced ? p->linesize[2] * 2 : p->linesize[2];
518 s->last_slice_end = 0;
520 if (s->bitstream_bpp < 24) {
522 int lefty, leftu, leftv;
523 int lefttopy, lefttopu, lefttopv;
526 p->data[0][3] = get_bits(&s->gb, 8);
527 p->data[0][2] = get_bits(&s->gb, 8);
528 p->data[0][1] = get_bits(&s->gb, 8);
529 p->data[0][0] = get_bits(&s->gb, 8);
531 av_log(avctx, AV_LOG_ERROR,
532 "YUY2 output is not implemented yet\n");
536 leftv = p->data[2][0] = get_bits(&s->gb, 8);
537 lefty = p->data[0][1] = get_bits(&s->gb, 8);
538 leftu = p->data[1][0] = get_bits(&s->gb, 8);
539 p->data[0][0] = get_bits(&s->gb, 8);
541 switch (s->predictor) {
544 decode_422_bitstream(s, width-2);
545 lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);
546 if (!(s->flags&CODEC_FLAG_GRAY)) {
547 leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
548 leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
551 for (cy = y = 1; y < s->height; y++, cy++) {
552 uint8_t *ydst, *udst, *vdst;
554 if (s->bitstream_bpp == 12) {
555 decode_gray_bitstream(s, width);
557 ydst = p->data[0] + p->linesize[0] * y;
559 lefty = s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);
560 if (s->predictor == PLANE) {
561 if (y > s->interlaced)
562 s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
565 if (y >= s->height) break;
570 ydst = p->data[0] + p->linesize[0]*y;
571 udst = p->data[1] + p->linesize[1]*cy;
572 vdst = p->data[2] + p->linesize[2]*cy;
574 decode_422_bitstream(s, width);
575 lefty = s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);
576 if (!(s->flags & CODEC_FLAG_GRAY)) {
577 leftu= s->dsp.add_hfyu_left_prediction(udst, s->temp[1], width2, leftu);
578 leftv= s->dsp.add_hfyu_left_prediction(vdst, s->temp[2], width2, leftv);
580 if (s->predictor == PLANE) {
581 if (cy > s->interlaced) {
582 s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
583 if (!(s->flags & CODEC_FLAG_GRAY)) {
584 s->dsp.add_bytes(udst, udst - fake_ustride, width2);
585 s->dsp.add_bytes(vdst, vdst - fake_vstride, width2);
590 draw_slice(s, p, height);
594 /* first line except first 2 pixels is left predicted */
595 decode_422_bitstream(s, width - 2);
596 lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width - 2, lefty);
597 if (!(s->flags & CODEC_FLAG_GRAY)) {
598 leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
599 leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
604 /* second line is left predicted for interlaced case */
606 decode_422_bitstream(s, width);
607 lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + p->linesize[0], s->temp[0], width, lefty);
608 if (!(s->flags & CODEC_FLAG_GRAY)) {
609 leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);
610 leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);
615 /* next 4 pixels are left predicted too */
616 decode_422_bitstream(s, 4);
617 lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + fake_ystride, s->temp[0], 4, lefty);
618 if (!(s->flags&CODEC_FLAG_GRAY)) {
619 leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + fake_ustride, s->temp[1], 2, leftu);
620 leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + fake_vstride, s->temp[2], 2, leftv);
623 /* next line except the first 4 pixels is median predicted */
624 lefttopy = p->data[0][3];
625 decode_422_bitstream(s, width - 4);
626 s->dsp.add_hfyu_median_prediction(p->data[0] + fake_ystride+4, p->data[0]+4, s->temp[0], width-4, &lefty, &lefttopy);
627 if (!(s->flags&CODEC_FLAG_GRAY)) {
628 lefttopu = p->data[1][1];
629 lefttopv = p->data[2][1];
630 s->dsp.add_hfyu_median_prediction(p->data[1] + fake_ustride+2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);
631 s->dsp.add_hfyu_median_prediction(p->data[2] + fake_vstride+2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);
635 for (; y<height; y++, cy++) {
636 uint8_t *ydst, *udst, *vdst;
638 if (s->bitstream_bpp == 12) {
640 decode_gray_bitstream(s, width);
641 ydst = p->data[0] + p->linesize[0] * y;
642 s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
645 if (y >= height) break;
649 decode_422_bitstream(s, width);
651 ydst = p->data[0] + p->linesize[0] * y;
652 udst = p->data[1] + p->linesize[1] * cy;
653 vdst = p->data[2] + p->linesize[2] * cy;
655 s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
656 if (!(s->flags & CODEC_FLAG_GRAY)) {
657 s->dsp.add_hfyu_median_prediction(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);
658 s->dsp.add_hfyu_median_prediction(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);
662 draw_slice(s, p, height);
668 int leftr, leftg, leftb, lefta;
669 const int last_line = (height - 1) * p->linesize[0];
671 if (s->bitstream_bpp == 32) {
672 lefta = p->data[0][last_line+A] = get_bits(&s->gb, 8);
673 leftr = p->data[0][last_line+R] = get_bits(&s->gb, 8);
674 leftg = p->data[0][last_line+G] = get_bits(&s->gb, 8);
675 leftb = p->data[0][last_line+B] = get_bits(&s->gb, 8);
677 leftr = p->data[0][last_line+R] = get_bits(&s->gb, 8);
678 leftg = p->data[0][last_line+G] = get_bits(&s->gb, 8);
679 leftb = p->data[0][last_line+B] = get_bits(&s->gb, 8);
680 lefta = p->data[0][last_line+A] = 255;
681 skip_bits(&s->gb, 8);
685 switch (s->predictor) {
688 decode_bgr_bitstream(s, width - 1);
689 s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + last_line+4, s->temp[0], width - 1, &leftr, &leftg, &leftb, &lefta);
691 for (y = s->height - 2; y >= 0; y--) { //Yes it is stored upside down.
692 decode_bgr_bitstream(s, width);
694 s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + p->linesize[0]*y, s->temp[0], width, &leftr, &leftg, &leftb, &lefta);
695 if (s->predictor == PLANE) {
696 if (s->bitstream_bpp != 32) lefta = 0;
697 if ((y & s->interlaced) == 0 &&
698 y < s->height - 1 - s->interlaced) {
699 s->dsp.add_bytes(p->data[0] + p->linesize[0] * y,
700 p->data[0] + p->linesize[0] * y +
701 fake_ystride, fake_ystride);
705 // just 1 large slice as this is not possible in reverse order
706 draw_slice(s, p, height);
709 av_log(avctx, AV_LOG_ERROR,
710 "prediction type not supported!\n");
713 av_log(avctx, AV_LOG_ERROR,
714 "BGR24 output is not implemented yet\n");
722 return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;
725 static av_cold int decode_end(AVCodecContext *avctx)
727 HYuvContext *s = avctx->priv_data;
730 ff_huffyuv_common_end(s);
731 av_freep(&s->bitstream_buffer);
733 for (i = 0; i < 6; i++) {
734 ff_free_vlc(&s->vlc[i]);
740 #if CONFIG_HUFFYUV_DECODER
741 AVCodec ff_huffyuv_decoder = {
743 .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),
744 .type = AVMEDIA_TYPE_VIDEO,
745 .id = AV_CODEC_ID_HUFFYUV,
746 .priv_data_size = sizeof(HYuvContext),
749 .decode = decode_frame,
750 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
751 CODEC_CAP_FRAME_THREADS,
752 .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
756 #if CONFIG_FFVHUFF_DECODER
757 AVCodec ff_ffvhuff_decoder = {
759 .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),
760 .type = AVMEDIA_TYPE_VIDEO,
761 .id = AV_CODEC_ID_FFVHUFF,
762 .priv_data_size = sizeof(HYuvContext),
765 .decode = decode_frame,
766 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
767 CODEC_CAP_FRAME_THREADS,
768 .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),