FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* MidiVid MV30 decoder
3			*
4			* Copyright (c) 2020 Paul B Mahol
5			*
6			* This file is part of FFmpeg.
7			*
8			* FFmpeg is free software; you can redistribute it and/or
9			* modify it under the terms of the GNU Lesser General Public
10			* License as published by the Free Software Foundation; either
11			* version 2.1 of the License, or (at your option) any later version.
12			*
13			* FFmpeg is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16			* Lesser General Public License for more details.
17			*
18			* You should have received a copy of the GNU Lesser General Public
19			* License along with FFmpeg; if not, write to the Free Software
20			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21			*/
22
23			#include <stddef.h>
24			#include <string.h>
25
26			#include "libavutil/mem.h"
27			#include "libavutil/thread.h"
28
29			#include "avcodec.h"
30			#include "bytestream.h"
31			#include "codec_internal.h"
32			#include "copy_block.h"
33			#include "decode.h"
34			#include "mathops.h"
35			#include "blockdsp.h"
36			#include "get_bits.h"
37			#include "aandcttab.h"
38
39			#define CBP_VLC_BITS 9
40
41			typedef struct MV30Context {
42			GetBitContext gb;
43
44			int intra_quant;
45			int inter_quant;
46			int is_inter;
47			int mode_size;
48			int nb_mvectors;
49
50			int block[6][64];
51			int16_t *mvectors;
52			unsigned int mvectors_size;
53			int16_t *coeffs;
54			unsigned int coeffs_size;
55
56			int16_t intraq_tab[2][64];
57			int16_t interq_tab[2][64];
58
59			BlockDSPContext bdsp;
60			AVFrame *prev_frame;
61			} MV30Context;
62
63			static VLCElem cbp_tab[1 << CBP_VLC_BITS];
64
65			static const uint8_t luma_tab[] = {
66			12, 12, 15, 19, 25, 34, 40, 48,
67			12, 12, 18, 22, 27, 44, 47, 46,
68			17, 18, 21, 26, 35, 46, 52, 47,
69			18, 20, 24, 28, 40, 61, 59, 51,
70			20, 24, 32, 43, 50, 72, 72, 63,
71			25, 31, 42, 48, 58, 72, 81, 75,
72			38, 46, 54, 61, 71, 84, 88, 85,
73			50, 61, 65, 68, 79, 78, 86, 91,
74			};
75
76			static const uint8_t chroma_tab[] = {
77			12, 16, 24, 47, 99, 99, 99, 99,
78			16, 21, 26, 66, 99, 99, 99, 99,
79			24, 26, 56, 99, 99, 99, 99, 99,
80			47, 66, 99, 99, 99, 99, 99, 99,
81			99, 99, 99, 99, 99, 99, 99, 99,
82			99, 99, 99, 99, 99, 99, 99, 99,
83			99, 99, 99, 99, 99, 99, 99, 99,
84			99, 99, 99, 99, 99, 99, 99, 99,
85			};
86
87			static const uint8_t zigzag[] = {
88			0, 1, 8, 9, 16, 2, 3, 10,
89			17, 24, 32, 25, 18, 11, 4, 5,
90			12, 19, 26, 33, 40, 48, 41, 34,
91			27, 20, 13, 6, 7, 14, 21, 28,
92			35, 42, 49, 56, 57, 50, 43, 36,
93			29, 22, 15, 23, 30, 37, 44, 51,
94			58, 59, 52, 45, 38, 31, 39, 46,
95			53, 60, 61, 54, 47, 55, 62, 63,
96			};
97
98		✗	static void get_qtable(int16_t *table, int quant, const uint8_t *quant_tab)
99			{
100		✗	int factor = quant < 50 ? 5000 / FFMAX(quant, 1) : 200 - FFMIN(quant, 100) * 2;
101
102		✗	for (int i = 0; i < 64; i++) {
103		✗	table[i] = av_clip((quant_tab[i] * factor + 0x32) / 100, 1, 0x7fff);
104		✗	table[i] = ((int)ff_aanscales[i] * (int)table[i] + 0x800) >> 12;
105			}
106		✗	}
107
108		✗	static inline void idct_1d(unsigned *blk, int step)
109			{
110		✗	const unsigned t0 = blk[0 * step] + blk[4 * step];
111		✗	const unsigned t1 = blk[0 * step] - blk[4 * step];
112		✗	const unsigned t2 = blk[2 * step] + blk[6 * step];
113		✗	const unsigned t3 = ((int)((blk[2 * step] - blk[6 * step]) * 362U) >> 8) - t2;
114		✗	const unsigned t4 = t0 + t2;
115		✗	const unsigned t5 = t0 - t2;
116		✗	const unsigned t6 = t1 + t3;
117		✗	const unsigned t7 = t1 - t3;
118		✗	const unsigned t8 = blk[5 * step] + blk[3 * step];
119		✗	const unsigned t9 = blk[5 * step] - blk[3 * step];
120		✗	const unsigned tA = blk[1 * step] + blk[7 * step];
121		✗	const unsigned tB = blk[1 * step] - blk[7 * step];
122		✗	const unsigned tC = t8 + tA;
123		✗	const unsigned tD = (int)((tB + t9) * 473U) >> 8;
124		✗	const unsigned tE = (((int)(t9 * -669U) >> 8) - tC) + tD;
125		✗	const unsigned tF = ((int)((tA - t8) * 362U) >> 8) - tE;
126		✗	const unsigned t10 = (((int)(tB * 277U) >> 8) - tD) + tF;
127
128		✗	blk[0 * step] = t4 + tC;
129		✗	blk[1 * step] = t6 + tE;
130		✗	blk[2 * step] = t7 + tF;
131		✗	blk[3 * step] = t5 - t10;
132		✗	blk[4 * step] = t5 + t10;
133		✗	blk[5 * step] = t7 - tF;
134		✗	blk[6 * step] = t6 - tE;
135		✗	blk[7 * step] = t4 - tC;
136		✗	}
137
138		✗	static void idct_put(uint8_t *dst, int stride, int *block)
139			{
140		✗	for (int i = 0; i < 8; i++) {
141		✗	if ((block[0x08 + i] |
142		✗	block[0x10 + i] |
143		✗	block[0x18 + i] |
144		✗	block[0x20 + i] |
145		✗	block[0x28 + i] |
146		✗	block[0x30 + i] |
147		✗	block[0x38 + i]) == 0) {
148		✗	block[0x08 + i] = block[i];
149		✗	block[0x10 + i] = block[i];
150		✗	block[0x18 + i] = block[i];
151		✗	block[0x20 + i] = block[i];
152		✗	block[0x28 + i] = block[i];
153		✗	block[0x30 + i] = block[i];
154		✗	block[0x38 + i] = block[i];
155			} else {
156		✗	idct_1d(block + i, 8);
157			}
158			}
159
160		✗	for (int i = 0; i < 8; i++) {
161		✗	idct_1d(block, 1);
162		✗	for (int j = 0; j < 8; j++)
163		✗	dst[j] = av_clip_uint8((block[j] >> 5) + 128);
164		✗	block += 8;
165		✗	dst += stride;
166			}
167		✗	}
168
169		✗	static void idct_add(uint8_t *dst, int stride,
170			const uint8_t *src, int in_linesize, int *block)
171			{
172		✗	for (int i = 0; i < 8; i++) {
173		✗	if ((block[0x08 + i] |
174		✗	block[0x10 + i] |
175		✗	block[0x18 + i] |
176		✗	block[0x20 + i] |
177		✗	block[0x28 + i] |
178		✗	block[0x30 + i] |
179		✗	block[0x38 + i]) == 0) {
180		✗	block[0x08 + i] = block[i];
181		✗	block[0x10 + i] = block[i];
182		✗	block[0x18 + i] = block[i];
183		✗	block[0x20 + i] = block[i];
184		✗	block[0x28 + i] = block[i];
185		✗	block[0x30 + i] = block[i];
186		✗	block[0x38 + i] = block[i];
187			} else {
188		✗	idct_1d(block + i, 8);
189			}
190			}
191
192		✗	for (int i = 0; i < 8; i++) {
193		✗	idct_1d(block, 1);
194		✗	for (int j = 0; j < 8; j++)
195		✗	dst[j] = av_clip_uint8((block[j] >> 5) + src[j]);
196		✗	block += 8;
197		✗	dst += stride;
198		✗	src += in_linesize;
199			}
200		✗	}
201
202		✗	static inline void idct2_1d(int *blk, int step)
203			{
204		✗	const unsigned int t0 = blk[0 * step];
205		✗	const unsigned int t1 = blk[1 * step];
206		✗	const unsigned int t2 = (int)(t1 * 473U) >> 8;
207		✗	const unsigned int t3 = t2 - t1;
208		✗	const unsigned int t4 = ((int)(t1 * 362U) >> 8) - t3;
209		✗	const unsigned int t5 = (((int)(t1 * 277U) >> 8) - t2) + t4;
210
211		✗	blk[0 * step] = t1 + t0;
212		✗	blk[1 * step] = t0 + t3;
213		✗	blk[2 * step] = t4 + t0;
214		✗	blk[3 * step] = t0 - t5;
215		✗	blk[4 * step] = t5 + t0;
216		✗	blk[5 * step] = t0 - t4;
217		✗	blk[6 * step] = t0 - t3;
218		✗	blk[7 * step] = t0 - t1;
219		✗	}
220
221		✗	static void idct2_put(uint8_t *dst, int stride, int *block)
222			{
223		✗	for (int i = 0; i < 2; i++) {
224		✗	if ((block[0x08 + i]) == 0) {
225		✗	block[0x08 + i] = block[i];
226		✗	block[0x10 + i] = block[i];
227		✗	block[0x18 + i] = block[i];
228		✗	block[0x20 + i] = block[i];
229		✗	block[0x28 + i] = block[i];
230		✗	block[0x30 + i] = block[i];
231		✗	block[0x38 + i] = block[i];
232			} else {
233		✗	idct2_1d(block + i, 8);
234			}
235			}
236
237		✗	for (int i = 0; i < 8; i++) {
238		✗	if (block[1] == 0) {
239		✗	for (int j = 0; j < 8; j++)
240		✗	dst[j] = av_clip_uint8((block[0] >> 5) + 128);
241			} else {
242		✗	idct2_1d(block, 1);
243		✗	for (int j = 0; j < 8; j++)
244		✗	dst[j] = av_clip_uint8((block[j] >> 5) + 128);
245			}
246		✗	block += 8;
247		✗	dst += stride;
248			}
249		✗	}
250
251		✗	static void idct2_add(uint8_t *dst, int stride,
252			const uint8_t *src, int in_linesize,
253			int *block)
254			{
255		✗	for (int i = 0; i < 2; i++) {
256		✗	if ((block[0x08 + i]) == 0) {
257		✗	block[0x08 + i] = block[i];
258		✗	block[0x10 + i] = block[i];
259		✗	block[0x18 + i] = block[i];
260		✗	block[0x20 + i] = block[i];
261		✗	block[0x28 + i] = block[i];
262		✗	block[0x30 + i] = block[i];
263		✗	block[0x38 + i] = block[i];
264			} else {
265		✗	idct2_1d(block + i, 8);
266			}
267			}
268
269		✗	for (int i = 0; i < 8; i++) {
270		✗	if (block[1] == 0) {
271		✗	for (int j = 0; j < 8; j++)
272		✗	dst[j] = av_clip_uint8((block[0] >> 5) + src[j]);
273			} else {
274		✗	idct2_1d(block, 1);
275		✗	for (int j = 0; j < 8; j++)
276		✗	dst[j] = av_clip_uint8((block[j] >> 5) + src[j]);
277			}
278		✗	block += 8;
279		✗	dst += stride;
280		✗	src += in_linesize;
281			}
282		✗	}
283
284		✗	static void update_inter_block(uint8_t *dst, int stride,
285			const uint8_t *src, int in_linesize,
286			int block)
287			{
288		✗	for (int i = 0; i < 8; i++) {
289		✗	for (int j = 0; j < 8; j++)
290		✗	dst[j] = av_clip_uint8(block + src[j]);
291		✗	dst += stride;
292		✗	src += in_linesize;
293			}
294		✗	}
295
296		✗	static int decode_intra_block(AVCodecContext *avctx, int mode,
297			GetByteContext *gbyte, int16_t *qtab,
298			int *block, int *pfill,
299			uint8_t *dst, int linesize)
300			{
301		✗	MV30Context *s = avctx->priv_data;
302			int fill;
303
304		✗	switch (mode) {
305		✗	case 0:
306		✗	s->bdsp.fill_block_tab[1](dst, 128, linesize, 8);
307		✗	break;
308		✗	case 1:
309		✗	fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
310		✗	pfill[0] += fill;
311		✗	block[0] = ((int)((unsigned)pfill[0] * qtab[0]) >> 5) + 128;
312		✗	s->bdsp.fill_block_tab[1](dst, block[0], linesize, 8);
313		✗	break;
314		✗	case 2:
315		✗	memset(block, 0, sizeof(*block) * 64);
316		✗	fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
317		✗	pfill[0] += fill;
318		✗	block[0] = (unsigned)pfill[0] * qtab[0];
319		✗	block[1] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[1];
320		✗	block[8] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[8];
321		✗	block[9] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[9];
322		✗	idct2_put(dst, linesize, block);
323		✗	break;
324		✗	case 3:
325		✗	fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
326		✗	pfill[0] += fill;
327		✗	block[0] = (unsigned)pfill[0] * qtab[0];
328		✗	for (int i = 1; i < 64; i++)
329		✗	block[zigzag[i]] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[zigzag[i]];
330		✗	idct_put(dst, linesize, block);
331		✗	break;
332			}
333
334		✗	return 0;
335			}
336
337		✗	static int decode_inter_block(AVCodecContext *avctx, int mode,
338			GetByteContext *gbyte, int16_t *qtab,
339			int *block, int *pfill,
340			uint8_t *dst, int linesize,
341			const uint8_t *src, int in_linesize)
342			{
343			int fill;
344
345		✗	switch (mode) {
346		✗	case 0:
347		✗	copy_block8(dst, src, linesize, in_linesize, 8);
348		✗	break;
349		✗	case 1:
350		✗	fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
351		✗	pfill[0] += fill;
352		✗	block[0] = (int)((unsigned)pfill[0] * qtab[0]) >> 5;
353		✗	update_inter_block(dst, linesize, src, in_linesize, block[0]);
354		✗	break;
355		✗	case 2:
356		✗	memset(block, 0, sizeof(*block) * 64);
357		✗	fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
358		✗	pfill[0] += fill;
359		✗	block[0] = (unsigned)pfill[0] * qtab[0];
360		✗	block[1] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[1];
361		✗	block[8] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[8];
362		✗	block[9] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[9];
363		✗	idct2_add(dst, linesize, src, in_linesize, block);
364		✗	break;
365		✗	case 3:
366		✗	fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
367		✗	pfill[0] += fill;
368		✗	block[0] = (unsigned)pfill[0] * qtab[0];
369		✗	for (int i = 1; i < 64; i++)
370		✗	block[zigzag[i]] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[zigzag[i]];
371		✗	idct_add(dst, linesize, src, in_linesize, block);
372		✗	break;
373			}
374
375		✗	return 0;
376			}
377
378		✗	static int decode_coeffs(GetBitContext *gb, int16_t *coeffs, int nb_codes)
379			{
380		✗	memset(coeffs, 0, nb_codes * sizeof(*coeffs));
381
382		✗	for (int i = 0; i < nb_codes;) {
383		✗	int value = get_vlc2(gb, cbp_tab, CBP_VLC_BITS, 1);
384
385		✗	if (value > 0) {
386		✗	int x = get_bits(gb, value);
387
388		✗	if (x < (1 << value) / 2) {
389		✗	x = (1 << (value - 1)) + (x & ((1 << value) - 1 >> 1));
390			} else {
391		✗	x = -(1 << (value - 1)) - (x & ((1 << value) - 1 >> 1));
392			}
393		✗	coeffs[i++] = x;
394			} else {
395		✗	int flag = get_bits1(gb);
396
397		✗	i += get_bits(gb, 3 + flag * 3) + 1 + flag * 8;
398			}
399			}
400
401		✗	return 0;
402			}
403
404		✗	static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame)
405			{
406		✗	MV30Context *s = avctx->priv_data;
407			GetBitContext mgb;
408			uint8_t *dst[6];
409			int linesize[6];
410			int ret;
411
412		✗	mgb = *gb;
413		✗	if (get_bits_left(gb) < s->mode_size * 8)
414		✗	return AVERROR_INVALIDDATA;
415
416		✗	skip_bits_long(gb, s->mode_size * 8);
417
418		✗	linesize[0] = frame->linesize[0];
419		✗	linesize[1] = frame->linesize[0];
420		✗	linesize[2] = frame->linesize[0];
421		✗	linesize[3] = frame->linesize[0];
422		✗	linesize[4] = frame->linesize[1];
423		✗	linesize[5] = frame->linesize[2];
424
425		✗	for (int y = 0; y < avctx->height; y += 16) {
426			GetByteContext gbyte;
427		✗	int pfill[3][1] = { {0} };
428		✗	int nb_codes = get_bits(gb, 16);
429
430		✗	av_fast_padded_malloc(&s->coeffs, &s->coeffs_size, nb_codes * sizeof(*s->coeffs));
431		✗	if (!s->coeffs)
432		✗	return AVERROR(ENOMEM);
433		✗	ret = decode_coeffs(gb, s->coeffs, nb_codes);
434		✗	if (ret < 0)
435		✗	return ret;
436
437		✗	bytestream2_init(&gbyte, (uint8_t *)s->coeffs, nb_codes * sizeof(*s->coeffs));
438
439		✗	for (int x = 0; x < avctx->width; x += 16) {
440		✗	dst[0] = frame->data[0] + linesize[0] * y + x;
441		✗	dst[1] = frame->data[0] + linesize[0] * y + x + 8;
442		✗	dst[2] = frame->data[0] + linesize[0] * (y + 8) + x;
443		✗	dst[3] = frame->data[0] + linesize[0] * (y + 8) + x + 8;
444		✗	dst[4] = frame->data[1] + linesize[4] * (y >> 1) + (x >> 1);
445		✗	dst[5] = frame->data[2] + linesize[5] * (y >> 1) + (x >> 1);
446
447		✗	for (int b = 0; b < 6; b++) {
448		✗	int mode = get_bits_le(&mgb, 2);
449
450		✗	ret = decode_intra_block(avctx, mode, &gbyte, s->intraq_tab[b >= 4],
451		✗	s->block[b],
452		✗	pfill[(b >= 4) + (b >= 5)],
453			dst[b], linesize[b]);
454		✗	if (ret < 0)
455		✗	return ret;
456			}
457			}
458			}
459
460		✗	return 0;
461			}
462
463		✗	static int decode_inter(AVCodecContext *avctx, GetBitContext *gb,
464			AVFrame *frame, AVFrame *prev)
465			{
466		✗	MV30Context *s = avctx->priv_data;
467			GetBitContext mask;
468			GetBitContext mgb;
469			GetByteContext mv;
470		✗	const int mask_size = ((avctx->height >> 4) * (avctx->width >> 4) * 2 + 7) / 8;
471			uint8_t *dst[6], *src[6];
472			int in_linesize[6];
473			int linesize[6];
474		✗	int ret, cnt = 0;
475		✗	int flags = 0;
476
477		✗	in_linesize[0] = prev->linesize[0];
478		✗	in_linesize[1] = prev->linesize[0];
479		✗	in_linesize[2] = prev->linesize[0];
480		✗	in_linesize[3] = prev->linesize[0];
481		✗	in_linesize[4] = prev->linesize[1];
482		✗	in_linesize[5] = prev->linesize[2];
483
484		✗	linesize[0] = frame->linesize[0];
485		✗	linesize[1] = frame->linesize[0];
486		✗	linesize[2] = frame->linesize[0];
487		✗	linesize[3] = frame->linesize[0];
488		✗	linesize[4] = frame->linesize[1];
489		✗	linesize[5] = frame->linesize[2];
490
491		✗	av_fast_padded_malloc(&s->mvectors, &s->mvectors_size, 2 * s->nb_mvectors * sizeof(*s->mvectors));
492		✗	if (!s->mvectors) {
493		✗	ret = AVERROR(ENOMEM);
494		✗	goto fail;
495			}
496
497		✗	mask = *gb;
498		✗	skip_bits_long(gb, mask_size * 8);
499		✗	mgb = *gb;
500		✗	skip_bits_long(gb, s->mode_size * 8);
501
502		✗	ret = decode_coeffs(gb, s->mvectors, 2 * s->nb_mvectors);
503		✗	if (ret < 0)
504		✗	goto fail;
505
506		✗	bytestream2_init(&mv, (uint8_t *)s->mvectors, 2 * s->nb_mvectors * sizeof(*s->mvectors));
507
508		✗	for (int y = 0; y < avctx->height; y += 16) {
509			GetByteContext gbyte;
510		✗	int pfill[3][1] = { {0} };
511		✗	int nb_codes = get_bits(gb, 16);
512
513		✗	skip_bits(gb, 8);
514		✗	if (get_bits_left(gb) < 0) {
515		✗	ret = AVERROR_INVALIDDATA;
516		✗	goto fail;
517			}
518
519		✗	av_fast_padded_malloc(&s->coeffs, &s->coeffs_size, nb_codes * sizeof(*s->coeffs));
520		✗	if (!s->coeffs) {
521		✗	ret = AVERROR(ENOMEM);
522		✗	goto fail;
523			}
524
525		✗	ret = decode_coeffs(gb, s->coeffs, nb_codes);
526		✗	if (ret < 0)
527		✗	goto fail;
528
529		✗	bytestream2_init(&gbyte, (uint8_t *)s->coeffs, nb_codes * sizeof(*s->coeffs));
530
531		✗	for (int x = 0; x < avctx->width; x += 16) {
532		✗	if (cnt >= 4)
533		✗	cnt = 0;
534		✗	if (cnt == 0) {
535		✗	if (get_bits_left(&mask) < 8) {
536		✗	ret = AVERROR_INVALIDDATA;
537		✗	goto fail;
538			}
539		✗	flags = get_bits(&mask, 8);
540			}
541
542		✗	dst[0] = frame->data[0] + linesize[0] * y + x;
543		✗	dst[1] = frame->data[0] + linesize[0] * y + x + 8;
544		✗	dst[2] = frame->data[0] + linesize[0] * (y + 8) + x;
545		✗	dst[3] = frame->data[0] + linesize[0] * (y + 8) + x + 8;
546		✗	dst[4] = frame->data[1] + linesize[4] * (y >> 1) + (x >> 1);
547		✗	dst[5] = frame->data[2] + linesize[5] * (y >> 1) + (x >> 1);
548
549		✗	if ((flags >> (cnt)) & 1) {
550		✗	int mv_x = sign_extend(bytestream2_get_ne16(&mv), 16);
551		✗	int mv_y = sign_extend(bytestream2_get_ne16(&mv), 16);
552
553		✗	int px = x + mv_x;
554		✗	int py = y + mv_y;
555
556		✗	if (px < 0 || px > FFALIGN(avctx->width , 16) - 16 ||
557		✗	py < 0 || py > FFALIGN(avctx->height, 16) - 16)
558		✗	return AVERROR_INVALIDDATA;
559
560		✗	src[0] = prev->data[0] + in_linesize[0] * py + px;
561		✗	src[1] = prev->data[0] + in_linesize[0] * py + px + 8;
562		✗	src[2] = prev->data[0] + in_linesize[0] * (py + 8) + px;
563		✗	src[3] = prev->data[0] + in_linesize[0] * (py + 8) + px + 8;
564		✗	src[4] = prev->data[1] + in_linesize[4] * (py >> 1) + (px >> 1);
565		✗	src[5] = prev->data[2] + in_linesize[5] * (py >> 1) + (px >> 1);
566
567		✗	if ((flags >> (cnt + 4)) & 1) {
568		✗	for (int b = 0; b < 6; b++)
569		✗	copy_block8(dst[b], src[b], linesize[b], in_linesize[b], 8);
570			} else {
571		✗	for (int b = 0; b < 6; b++) {
572		✗	int mode = get_bits_le(&mgb, 2);
573
574		✗	ret = decode_inter_block(avctx, mode, &gbyte, s->interq_tab[b >= 4],
575		✗	s->block[b],
576		✗	pfill[(b >= 4) + (b >= 5)],
577			dst[b], linesize[b],
578		✗	src[b], in_linesize[b]);
579		✗	if (ret < 0)
580		✗	goto fail;
581			}
582			}
583			} else {
584		✗	for (int b = 0; b < 6; b++) {
585		✗	int mode = get_bits_le(&mgb, 2);
586
587		✗	ret = decode_intra_block(avctx, mode, &gbyte, s->intraq_tab[b >= 4],
588		✗	s->block[b],
589		✗	pfill[(b >= 4) + (b >= 5)],
590			dst[b], linesize[b]);
591		✗	if (ret < 0)
592		✗	goto fail;
593			}
594			}
595
596		✗	cnt++;
597			}
598			}
599
600		✗	fail:
601		✗	return ret;
602			}
603
604		✗	static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
605			int *got_frame, AVPacket *avpkt)
606			{
607		✗	MV30Context *s = avctx->priv_data;
608		✗	GetBitContext *gb = &s->gb;
609			int ret;
610
611		✗	if ((ret = init_get_bits8(gb, avpkt->data, avpkt->size)) < 0)
612		✗	return ret;
613
614		✗	if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
615		✗	return ret;
616
617		✗	s->intra_quant = get_bits(gb, 8);
618		✗	s->inter_quant = s->intra_quant + get_sbits(gb, 8);
619		✗	s->is_inter = get_bits_le(gb, 16);
620		✗	s->mode_size = get_bits_le(gb, 16);
621		✗	if (s->is_inter)
622		✗	s->nb_mvectors = get_bits_le(gb, 16);
623
624		✗	get_qtable(s->intraq_tab[0], s->intra_quant, luma_tab);
625		✗	get_qtable(s->intraq_tab[1], s->intra_quant, chroma_tab);
626
627		✗	if (s->is_inter == 0) {
628		✗	frame->flags |= AV_FRAME_FLAG_KEY;
629		✗	ret = decode_intra(avctx, gb, frame);
630		✗	if (ret < 0)
631		✗	return ret;
632			} else {
633		✗	get_qtable(s->interq_tab[0], s->inter_quant, luma_tab);
634		✗	get_qtable(s->interq_tab[1], s->inter_quant, chroma_tab);
635
636		✗	if (!s->prev_frame->data[0]) {
637		✗	av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
638		✗	return AVERROR_INVALIDDATA;
639			}
640
641		✗	frame->flags &= ~AV_FRAME_FLAG_KEY;
642		✗	ret = decode_inter(avctx, gb, frame, s->prev_frame);
643		✗	if (ret < 0)
644		✗	return ret;
645			}
646
647		✗	if ((ret = av_frame_replace(s->prev_frame, frame)) < 0)
648		✗	return ret;
649
650		✗	*got_frame = 1;
651
652		✗	return avpkt->size;
653			}
654
655			static const uint8_t cbp_bits[] = {
656			2, 2, 3, 3, 3, 4, 5, 6, 7, 8, 9, 9,
657			};
658
659		✗	static av_cold void init_static_data(void)
660			{
661		✗	VLC_INIT_STATIC_TABLE_FROM_LENGTHS(cbp_tab, CBP_VLC_BITS,
662			FF_ARRAY_ELEMS(cbp_bits),
663			cbp_bits, 1, NULL, 0, 0, 0, 0);
664		✗	}
665
666		✗	static av_cold int decode_init(AVCodecContext *avctx)
667			{
668		✗	MV30Context *s = avctx->priv_data;
669			static AVOnce init_static_once = AV_ONCE_INIT;
670
671		✗	avctx->pix_fmt = AV_PIX_FMT_YUV420P;
672		✗	avctx->color_range = AVCOL_RANGE_JPEG;
673
674		✗	ff_blockdsp_init(&s->bdsp);
675
676		✗	s->prev_frame = av_frame_alloc();
677		✗	if (!s->prev_frame)
678		✗	return AVERROR(ENOMEM);
679
680		✗	ff_thread_once(&init_static_once, init_static_data);
681
682		✗	return 0;
683			}
684
685		✗	static void decode_flush(AVCodecContext *avctx)
686			{
687		✗	MV30Context *s = avctx->priv_data;
688
689		✗	av_frame_unref(s->prev_frame);
690		✗	}
691
692		✗	static av_cold int decode_close(AVCodecContext *avctx)
693			{
694		✗	MV30Context *s = avctx->priv_data;
695
696		✗	av_frame_free(&s->prev_frame);
697		✗	av_freep(&s->coeffs);
698		✗	s->coeffs_size = 0;
699		✗	av_freep(&s->mvectors);
700		✗	s->mvectors_size = 0;
701
702		✗	return 0;
703			}
704
705			const FFCodec ff_mv30_decoder = {
706			.p.name = "mv30",
707			CODEC_LONG_NAME("MidiVid 3.0"),
708			.p.type = AVMEDIA_TYPE_VIDEO,
709			.p.id = AV_CODEC_ID_MV30,
710			.priv_data_size = sizeof(MV30Context),
711			.init = decode_init,
712			.close = decode_close,
713			FF_CODEC_DECODE_CB(decode_frame),
714			.flush = decode_flush,
715			.p.capabilities = AV_CODEC_CAP_DR1,
716			.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
717			};
718