path: root/libavcodec/svq1dec.c (plain)
blob: d3e60c3a4ab08f97fb2dc3979fcc22289b639b15

1	/*
2	* SVQ1 decoder
3	* ported to MPlayer by Arpi <arpi@thot.banki.hu>
4	* ported to libavcodec by Nick Kurshev <nickols_k@mail.ru>
5	*
6	* Copyright (c) 2002 The Xine project
7	* Copyright (c) 2002 The FFmpeg project
8	*
9	* SVQ1 Encoder (c) 2004 Mike Melanson <melanson@pcisys.net>
10	*
11	* This file is part of FFmpeg.
12	*
13	* FFmpeg is free software; you can redistribute it and/or
14	* modify it under the terms of the GNU Lesser General Public
15	* License as published by the Free Software Foundation; either
16	* version 2.1 of the License, or (at your option) any later version.
17	*
18	* FFmpeg is distributed in the hope that it will be useful,
19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21	* Lesser General Public License for more details.
22	*
23	* You should have received a copy of the GNU Lesser General Public
24	* License along with FFmpeg; if not, write to the Free Software
25	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26	*/
27
28	/**
29	* @file
30	* Sorenson Vector Quantizer #1 (SVQ1) video codec.
31	* For more information of the SVQ1 algorithm, visit:
32	* http://www.pcisys.net/~melanson/codecs/
33	*/
34
35	#include "avcodec.h"
36	#include "get_bits.h"
37	#include "h263.h"
38	#include "hpeldsp.h"
39	#include "internal.h"
40	#include "mathops.h"
41	#include "svq1.h"
42
43	static VLC svq1_block_type;
44	static VLC svq1_motion_component;
45	static VLC svq1_intra_multistage[6];
46	static VLC svq1_inter_multistage[6];
47	static VLC svq1_intra_mean;
48	static VLC svq1_inter_mean;
49
50	/* motion vector (prediction) */
51	typedef struct svq1_pmv_s {
52	int x;
53	int y;
54	} svq1_pmv;
55
56	typedef struct SVQ1Context {
57	HpelDSPContext hdsp;
58	GetBitContext gb;
59	AVFrame *prev;
60
61	uint8_t *pkt_swapped;
62	int pkt_swapped_allocated;
63
64	int width;
65	int height;
66	int frame_code;
67	int nonref; // 1 if the current frame won't be referenced
68	} SVQ1Context;
69
70	static const uint8_t string_table[256] = {
71	0x00, 0xD5, 0x7F, 0xAA, 0xFE, 0x2B, 0x81, 0x54,
72	0x29, 0xFC, 0x56, 0x83, 0xD7, 0x02, 0xA8, 0x7D,
73	0x52, 0x87, 0x2D, 0xF8, 0xAC, 0x79, 0xD3, 0x06,
74	0x7B, 0xAE, 0x04, 0xD1, 0x85, 0x50, 0xFA, 0x2F,
75	0xA4, 0x71, 0xDB, 0x0E, 0x5A, 0x8F, 0x25, 0xF0,
76	0x8D, 0x58, 0xF2, 0x27, 0x73, 0xA6, 0x0C, 0xD9,
77	0xF6, 0x23, 0x89, 0x5C, 0x08, 0xDD, 0x77, 0xA2,
78	0xDF, 0x0A, 0xA0, 0x75, 0x21, 0xF4, 0x5E, 0x8B,
79	0x9D, 0x48, 0xE2, 0x37, 0x63, 0xB6, 0x1C, 0xC9,
80	0xB4, 0x61, 0xCB, 0x1E, 0x4A, 0x9F, 0x35, 0xE0,
81	0xCF, 0x1A, 0xB0, 0x65, 0x31, 0xE4, 0x4E, 0x9B,
82	0xE6, 0x33, 0x99, 0x4C, 0x18, 0xCD, 0x67, 0xB2,
83	0x39, 0xEC, 0x46, 0x93, 0xC7, 0x12, 0xB8, 0x6D,
84	0x10, 0xC5, 0x6F, 0xBA, 0xEE, 0x3B, 0x91, 0x44,
85	0x6B, 0xBE, 0x14, 0xC1, 0x95, 0x40, 0xEA, 0x3F,
86	0x42, 0x97, 0x3D, 0xE8, 0xBC, 0x69, 0xC3, 0x16,
87	0xEF, 0x3A, 0x90, 0x45, 0x11, 0xC4, 0x6E, 0xBB,
88	0xC6, 0x13, 0xB9, 0x6C, 0x38, 0xED, 0x47, 0x92,
89	0xBD, 0x68, 0xC2, 0x17, 0x43, 0x96, 0x3C, 0xE9,
90	0x94, 0x41, 0xEB, 0x3E, 0x6A, 0xBF, 0x15, 0xC0,
91	0x4B, 0x9E, 0x34, 0xE1, 0xB5, 0x60, 0xCA, 0x1F,
92	0x62, 0xB7, 0x1D, 0xC8, 0x9C, 0x49, 0xE3, 0x36,
93	0x19, 0xCC, 0x66, 0xB3, 0xE7, 0x32, 0x98, 0x4D,
94	0x30, 0xE5, 0x4F, 0x9A, 0xCE, 0x1B, 0xB1, 0x64,
95	0x72, 0xA7, 0x0D, 0xD8, 0x8C, 0x59, 0xF3, 0x26,
96	0x5B, 0x8E, 0x24, 0xF1, 0xA5, 0x70, 0xDA, 0x0F,
97	0x20, 0xF5, 0x5F, 0x8A, 0xDE, 0x0B, 0xA1, 0x74,
98	0x09, 0xDC, 0x76, 0xA3, 0xF7, 0x22, 0x88, 0x5D,
99	0xD6, 0x03, 0xA9, 0x7C, 0x28, 0xFD, 0x57, 0x82,
100	0xFF, 0x2A, 0x80, 0x55, 0x01, 0xD4, 0x7E, 0xAB,
101	0x84, 0x51, 0xFB, 0x2E, 0x7A, 0xAF, 0x05, 0xD0,
102	0xAD, 0x78, 0xD2, 0x07, 0x53, 0x86, 0x2C, 0xF9
103	};
104
105	#define SVQ1_PROCESS_VECTOR() \
106	for (; level > 0; i++) { \
107	/* process next depth */ \
108	if (i == m) { \
109	m = n; \
110	if (--level == 0) \
111	break; \
112	} \
113	/* divide block if next bit set */ \
114	if (!get_bits1(bitbuf)) \
115	break; \
116	/* add child nodes */ \
117	list[n++] = list[i]; \
118	list[n++] = list[i] + (((level & 1) ? pitch : 1) << ((level >> 1) + 1));\
119	}
120
121	#define SVQ1_ADD_CODEBOOK() \
122	/* add codebook entries to vector */ \
123	for (j = 0; j < stages; j++) { \
124	n3 = codebook[entries[j]] ^ 0x80808080; \
125	n1 += (n3 & 0xFF00FF00) >> 8; \
126	n2 += n3 & 0x00FF00FF; \
127	} \
128	\
129	/* clip to [0..255] */ \
130	if (n1 & 0xFF00FF00) { \
131	n3 = (n1 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
132	n1 += 0x7F007F00; \
133	n1 |= (~n1 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
134	n1 &= n3 & 0x00FF00FF; \
135	} \
136	\
137	if (n2 & 0xFF00FF00) { \
138	n3 = (n2 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
139	n2 += 0x7F007F00; \
140	n2 |= (~n2 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
141	n2 &= n3 & 0x00FF00FF; \
142	}
143
144	#define SVQ1_CALC_CODEBOOK_ENTRIES(cbook) \
145	codebook = (const uint32_t *)cbook[level]; \
146	if (stages > 0) \
147	bit_cache = get_bits(bitbuf, 4 * stages); \
148	/* calculate codebook entries for this vector */ \
149	for (j = 0; j < stages; j++) { \
150	entries[j] = (((bit_cache >> (4 * (stages - j - 1))) & 0xF) + \
151	16 * j) << (level + 1); \
152	} \
153	mean -= stages * 128; \
154	n4 = (mean << 16) + mean;
155
156	static int svq1_decode_block_intra(GetBitContext *bitbuf, uint8_t *pixels,
157	ptrdiff_t pitch)
158	{
159	uint32_t bit_cache;
160	uint8_t *list[63];
161	uint32_t *dst;
162	const uint32_t *codebook;
163	int entries[6];
164	int i, j, m, n;
165	int stages;
166	unsigned mean;
167	unsigned x, y, width, height, level;
168	uint32_t n1, n2, n3, n4;
169
170	/* initialize list for breadth first processing of vectors */
171	list[0] = pixels;
172
173	/* recursively process vector */
174	for (i = 0, m = 1, n = 1, level = 5; i < n; i++) {
175	SVQ1_PROCESS_VECTOR();
176
177	/* destination address and vector size */
178	dst = (uint32_t *)list[i];
179	width = 1 << ((4 + level) / 2);
180	height = 1 << ((3 + level) / 2);
181
182	/* get number of stages (-1 skips vector, 0 for mean only) */
183	stages = get_vlc2(bitbuf, svq1_intra_multistage[level].table, 3, 3) - 1;
184
185	if (stages == -1) {
186	for (y = 0; y < height; y++)
187	memset(&dst[y * (pitch / 4)], 0, width);
188	continue; /* skip vector */
189	}
190
191	if ((stages > 0 && level >= 4)) {
192	ff_dlog(NULL,
193	"Error (svq1_decode_block_intra): invalid vector: stages=%i level=%i\n",
194	stages, level);
195	return AVERROR_INVALIDDATA; /* invalid vector */
196	}
197	av_assert0(stages >= 0);
198
199	mean = get_vlc2(bitbuf, svq1_intra_mean.table, 8, 3);
200
201	if (stages == 0) {
202	for (y = 0; y < height; y++)
203	memset(&dst[y * (pitch / 4)], mean, width);
204	} else {
205	SVQ1_CALC_CODEBOOK_ENTRIES(ff_svq1_intra_codebooks);
206
207	for (y = 0; y < height; y++) {
208	for (x = 0; x < width / 4; x++, codebook++) {
209	n1 = n4;
210	n2 = n4;
211	SVQ1_ADD_CODEBOOK()
212	/* store result */
213	dst[x] = n1 << 8 | n2;
214	}
215	dst += pitch / 4;
216	}
217	}
218	}
219
220	return 0;
221	}
222
223	static int svq1_decode_block_non_intra(GetBitContext *bitbuf, uint8_t *pixels,
224	ptrdiff_t pitch)
225	{
226	uint32_t bit_cache;
227	uint8_t *list[63];
228	uint32_t *dst;
229	const uint32_t *codebook;
230	int entries[6];
231	int i, j, m, n;
232	int stages;
233	unsigned mean;
234	int x, y, width, height, level;
235	uint32_t n1, n2, n3, n4;
236
237	/* initialize list for breadth first processing of vectors */
238	list[0] = pixels;
239
240	/* recursively process vector */
241	for (i = 0, m = 1, n = 1, level = 5; i < n; i++) {
242	SVQ1_PROCESS_VECTOR();
243
244	/* destination address and vector size */
245	dst = (uint32_t *)list[i];
246	width = 1 << ((4 + level) / 2);
247	height = 1 << ((3 + level) / 2);
248
249	/* get number of stages (-1 skips vector, 0 for mean only) */
250	stages = get_vlc2(bitbuf, svq1_inter_multistage[level].table, 3, 2) - 1;
251
252	if (stages == -1)
253	continue; /* skip vector */
254
255	if ((stages > 0 && level >= 4)) {
256	ff_dlog(NULL,
257	"Error (svq1_decode_block_non_intra): invalid vector: stages=%i level=%i\n",
258	stages, level);
259	return AVERROR_INVALIDDATA; /* invalid vector */
260	}
261	av_assert0(stages >= 0);
262
263	mean = get_vlc2(bitbuf, svq1_inter_mean.table, 9, 3) - 256;
264
265	SVQ1_CALC_CODEBOOK_ENTRIES(ff_svq1_inter_codebooks);
266
267	for (y = 0; y < height; y++) {
268	for (x = 0; x < width / 4; x++, codebook++) {
269	n3 = dst[x];
270	/* add mean value to vector */
271	n1 = n4 + ((n3 & 0xFF00FF00) >> 8);
272	n2 = n4 + (n3 & 0x00FF00FF);
273	SVQ1_ADD_CODEBOOK()
274	/* store result */
275	dst[x] = n1 << 8 | n2;
276	}
277	dst += pitch / 4;
278	}
279	}
280	return 0;
281	}
282
283	static int svq1_decode_motion_vector(GetBitContext *bitbuf, svq1_pmv *mv,
284	svq1_pmv **pmv)
285	{
286	int diff;
287	int i;
288
289	for (i = 0; i < 2; i++) {
290	/* get motion code */
291	diff = get_vlc2(bitbuf, svq1_motion_component.table, 7, 2);
292	if (diff < 0)
293	return AVERROR_INVALIDDATA;
294	else if (diff) {
295	if (get_bits1(bitbuf))
296	diff = -diff;
297	}
298
299	/* add median of motion vector predictors and clip result */
300	if (i == 1)
301	mv->y = sign_extend(diff + mid_pred(pmv[0]->y, pmv[1]->y, pmv[2]->y), 6);
302	else
303	mv->x = sign_extend(diff + mid_pred(pmv[0]->x, pmv[1]->x, pmv[2]->x), 6);
304	}
305
306	return 0;
307	}
308
309	static void svq1_skip_block(uint8_t *current, uint8_t *previous,
310	ptrdiff_t pitch, int x, int y)
311	{
312	uint8_t *src;
313	uint8_t *dst;
314	int i;
315
316	src = &previous[x + y * pitch];
317	dst = current;
318
319	for (i = 0; i < 16; i++) {
320	memcpy(dst, src, 16);
321	src += pitch;
322	dst += pitch;
323	}
324	}
325
326	static int svq1_motion_inter_block(HpelDSPContext *hdsp, GetBitContext *bitbuf,
327	uint8_t *current, uint8_t *previous,
328	ptrdiff_t pitch, svq1_pmv *motion, int x, int y,
329	int width, int height)
330	{
331	uint8_t *src;
332	uint8_t *dst;
333	svq1_pmv mv;
334	svq1_pmv *pmv[3];
335	int result;
336
337	/* predict and decode motion vector */
338	pmv[0] = &motion[0];
339	if (y == 0) {
340	pmv[1] =
341	pmv[2] = pmv[0];
342	} else {
343	pmv[1] = &motion[x / 8 + 2];
344	pmv[2] = &motion[x / 8 + 4];
345	}
346
347	result = svq1_decode_motion_vector(bitbuf, &mv, pmv);
348	if (result)
349	return result;
350
351	motion[0].x =
352	motion[x / 8 + 2].x =
353	motion[x / 8 + 3].x = mv.x;
354	motion[0].y =
355	motion[x / 8 + 2].y =
356	motion[x / 8 + 3].y = mv.y;
357
358	mv.x = av_clip(mv.x, -2 * x, 2 * (width - x - 16));
359	mv.y = av_clip(mv.y, -2 * y, 2 * (height - y - 16));
360
361	src = &previous[(x + (mv.x >> 1)) + (y + (mv.y >> 1)) * pitch];
362	dst = current;
363
364	hdsp->put_pixels_tab[0][(mv.y & 1) << 1 | (mv.x & 1)](dst, src, pitch, 16);
365
366	return 0;
367	}
368
369	static int svq1_motion_inter_4v_block(HpelDSPContext *hdsp, GetBitContext *bitbuf,
370	uint8_t *current, uint8_t *previous,
371	ptrdiff_t pitch, svq1_pmv *motion, int x, int y,
372	int width, int height)
373	{
374	uint8_t *src;
375	uint8_t *dst;
376	svq1_pmv mv;
377	svq1_pmv *pmv[4];
378	int i, result;
379
380	/* predict and decode motion vector (0) */
381	pmv[0] = &motion[0];
382	if (y == 0) {
383	pmv[1] =
384	pmv[2] = pmv[0];
385	} else {
386	pmv[1] = &motion[(x / 8) + 2];
387	pmv[2] = &motion[(x / 8) + 4];
388	}
389
390	result = svq1_decode_motion_vector(bitbuf, &mv, pmv);
391	if (result)
392	return result;
393
394	/* predict and decode motion vector (1) */
395	pmv[0] = &mv;
396	if (y == 0) {
397	pmv[1] =
398	pmv[2] = pmv[0];
399	} else {
400	pmv[1] = &motion[(x / 8) + 3];
401	}
402	result = svq1_decode_motion_vector(bitbuf, &motion[0], pmv);
403	if (result)
404	return result;
405
406	/* predict and decode motion vector (2) */
407	pmv[1] = &motion[0];
408	pmv[2] = &motion[(x / 8) + 1];
409
410	result = svq1_decode_motion_vector(bitbuf, &motion[(x / 8) + 2], pmv);
411	if (result)
412	return result;
413
414	/* predict and decode motion vector (3) */
415	pmv[2] = &motion[(x / 8) + 2];
416	pmv[3] = &motion[(x / 8) + 3];
417
418	result = svq1_decode_motion_vector(bitbuf, pmv[3], pmv);
419	if (result)
420	return result;
421
422	/* form predictions */
423	for (i = 0; i < 4; i++) {
424	int mvx = pmv[i]->x + (i & 1) * 16;
425	int mvy = pmv[i]->y + (i >> 1) * 16;
426
427	// FIXME: clipping or padding?
428	mvx = av_clip(mvx, -2 * x, 2 * (width - x - 8));
429	mvy = av_clip(mvy, -2 * y, 2 * (height - y - 8));
430
431	src = &previous[(x + (mvx >> 1)) + (y + (mvy >> 1)) * pitch];
432	dst = current;
433
434	hdsp->put_pixels_tab[1][((mvy & 1) << 1) | (mvx & 1)](dst, src, pitch, 8);
435
436	/* select next block */
437	if (i & 1)
438	current += 8 * (pitch - 1);
439	else
440	current += 8;
441	}
442
443	return 0;
444	}
445
446	static int svq1_decode_delta_block(AVCodecContext *avctx, HpelDSPContext *hdsp,
447	GetBitContext *bitbuf,
448	uint8_t *current, uint8_t *previous,
449	ptrdiff_t pitch, svq1_pmv *motion, int x, int y,
450	int width, int height)
451	{
452	uint32_t block_type;
453	int result = 0;
454
455	/* get block type */
456	block_type = get_vlc2(bitbuf, svq1_block_type.table, 2, 2);
457
458	/* reset motion vectors */
459	if (block_type == SVQ1_BLOCK_SKIP || block_type == SVQ1_BLOCK_INTRA) {
460	motion[0].x =
461	motion[0].y =
462	motion[x / 8 + 2].x =
463	motion[x / 8 + 2].y =
464	motion[x / 8 + 3].x =
465	motion[x / 8 + 3].y = 0;
466	}
467
468	switch (block_type) {
469	case SVQ1_BLOCK_SKIP:
470	svq1_skip_block(current, previous, pitch, x, y);
471	break;
472
473	case SVQ1_BLOCK_INTER:
474	result = svq1_motion_inter_block(hdsp, bitbuf, current, previous,
475	pitch, motion, x, y, width, height);
476
477	if (result != 0) {
478	ff_dlog(avctx, "Error in svq1_motion_inter_block %i\n", result);
479	break;
480	}
481	result = svq1_decode_block_non_intra(bitbuf, current, pitch);
482	break;
483
484	case SVQ1_BLOCK_INTER_4V:
485	result = svq1_motion_inter_4v_block(hdsp, bitbuf, current, previous,
486	pitch, motion, x, y, width, height);
487
488	if (result != 0) {
489	ff_dlog(avctx, "Error in svq1_motion_inter_4v_block %i\n", result);
490	break;
491	}
492	result = svq1_decode_block_non_intra(bitbuf, current, pitch);
493	break;
494
495	case SVQ1_BLOCK_INTRA:
496	result = svq1_decode_block_intra(bitbuf, current, pitch);
497	break;
498	}
499
500	return result;
501	}
502
503	static void svq1_parse_string(GetBitContext *bitbuf, uint8_t out[257])
504	{
505	uint8_t seed;
506	int i;
507
508	out[0] = get_bits(bitbuf, 8);
509	seed = string_table[out[0]];
510
511	for (i = 1; i <= out[0]; i++) {
512	out[i] = get_bits(bitbuf, 8) ^ seed;
513	seed = string_table[out[i] ^ seed];
514	}
515	out[i] = 0;
516	}
517
518	static int svq1_decode_frame_header(AVCodecContext *avctx, AVFrame *frame)
519	{
520	SVQ1Context *s = avctx->priv_data;
521	GetBitContext *bitbuf = &s->gb;
522	int frame_size_code;
523	int width = s->width;
524	int height = s->height;
525
526	skip_bits(bitbuf, 8); /* temporal_reference */
527
528	/* frame type */
529	s->nonref = 0;
530	switch (get_bits(bitbuf, 2)) {
531	case 0:
532	frame->pict_type = AV_PICTURE_TYPE_I;
533	break;
534	case 2:
535	s->nonref = 1;
536	case 1:
537	frame->pict_type = AV_PICTURE_TYPE_P;
538	break;
539	default:
540	av_log(avctx, AV_LOG_ERROR, "Invalid frame type.\n");
541	return AVERROR_INVALIDDATA;
542	}
543
544	if (frame->pict_type == AV_PICTURE_TYPE_I) {
545	/* unknown fields */
546	if (s->frame_code == 0x50 || s->frame_code == 0x60) {
547	int csum = get_bits(bitbuf, 16);
548
549	csum = ff_svq1_packet_checksum(bitbuf->buffer,
550	bitbuf->size_in_bits >> 3,
551	csum);
552
553	ff_dlog(avctx, "%s checksum (%02x) for packet data\n",
554	(csum == 0) ? "correct" : "incorrect", csum);
555	}
556
557	if ((s->frame_code ^ 0x10) >= 0x50) {
558	uint8_t msg[257];
559
560	svq1_parse_string(bitbuf, msg);
561
562	av_log(avctx, AV_LOG_INFO,
563	"embedded message:\n%s\n", ((char *)msg) + 1);
564	}
565
566	skip_bits(bitbuf, 2);
567	skip_bits(bitbuf, 2);
568	skip_bits1(bitbuf);
569
570	/* load frame size */
571	frame_size_code = get_bits(bitbuf, 3);
572
573	if (frame_size_code == 7) {
574	/* load width, height (12 bits each) */
575	width = get_bits(bitbuf, 12);
576	height = get_bits(bitbuf, 12);
577
578	if (!width || !height)
579	return AVERROR_INVALIDDATA;
580	} else {
581	/* get width, height from table */
582	width = ff_svq1_frame_size_table[frame_size_code][0];
583	height = ff_svq1_frame_size_table[frame_size_code][1];
584	}
585	}
586
587	/* unknown fields */
588	if (get_bits1(bitbuf)) {
589	skip_bits1(bitbuf); /* use packet checksum if (1) */
590	skip_bits1(bitbuf); /* component checksums after image data if (1) */
591
592	if (get_bits(bitbuf, 2) != 0)
593	return AVERROR_INVALIDDATA;
594	}
595
596	if (get_bits1(bitbuf)) {
597	skip_bits1(bitbuf);
598	skip_bits(bitbuf, 4);
599	skip_bits1(bitbuf);
600	skip_bits(bitbuf, 2);
601
602	if (skip_1stop_8data_bits(bitbuf) < 0)
603	return AVERROR_INVALIDDATA;
604	}
605
606	s->width = width;
607	s->height = height;
608	return 0;
609	}
610
611	static int svq1_decode_frame(AVCodecContext *avctx, void *data,
612	int *got_frame, AVPacket *avpkt)
613	{
614	const uint8_t *buf = avpkt->data;
615	int buf_size = avpkt->size;
616	SVQ1Context *s = avctx->priv_data;
617	AVFrame *cur = data;
618	uint8_t *current;
619	int result, i, x, y, width, height;
620	svq1_pmv *pmv;
621	int ret;
622
623	/* initialize bit buffer */
624	ret = init_get_bits8(&s->gb, buf, buf_size);
625	if (ret < 0)
626	return ret;
627
628	/* decode frame header */
629	s->frame_code = get_bits(&s->gb, 22);
630
631	if ((s->frame_code & ~0x70) || !(s->frame_code & 0x60))
632	return AVERROR_INVALIDDATA;
633
634	/* swap some header bytes (why?) */
635	if (s->frame_code != 0x20) {
636	uint32_t *src;
637
638	if (buf_size < 9 * 4) {
639	av_log(avctx, AV_LOG_ERROR, "Input packet too small\n");
640	return AVERROR_INVALIDDATA;
641	}
642
643	av_fast_padded_malloc(&s->pkt_swapped,
644	&s->pkt_swapped_allocated,
645	buf_size);
646	if (!s->pkt_swapped)
647	return AVERROR(ENOMEM);
648
649	memcpy(s->pkt_swapped, buf, buf_size);
650	buf = s->pkt_swapped;
651	init_get_bits(&s->gb, buf, buf_size * 8);
652	skip_bits(&s->gb, 22);
653
654	src = (uint32_t *)(s->pkt_swapped + 4);
655
656	for (i = 0; i < 4; i++)
657	src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i];
658	}
659
660	result = svq1_decode_frame_header(avctx, cur);
661	if (result != 0) {
662	ff_dlog(avctx, "Error in svq1_decode_frame_header %i\n", result);
663	return result;
664	}
665
666	result = ff_set_dimensions(avctx, s->width, s->height);
667	if (result < 0)
668	return result;
669
670	if ((avctx->skip_frame >= AVDISCARD_NONREF && s->nonref) ||
671	(avctx->skip_frame >= AVDISCARD_NONKEY &&
672	cur->pict_type != AV_PICTURE_TYPE_I) ||
673	avctx->skip_frame >= AVDISCARD_ALL)
674	return buf_size;
675
676	result = ff_get_buffer(avctx, cur, s->nonref ? 0 : AV_GET_BUFFER_FLAG_REF);
677	if (result < 0)
678	return result;
679
680	pmv = av_malloc((FFALIGN(s->width, 16) / 8 + 3) * sizeof(*pmv));
681	if (!pmv)
682	return AVERROR(ENOMEM);
683
684	/* decode y, u and v components */
685	for (i = 0; i < 3; i++) {
686	int linesize = cur->linesize[i];
687	if (i == 0) {
688	width = FFALIGN(s->width, 16);
689	height = FFALIGN(s->height, 16);
690	} else {
691	if (avctx->flags & AV_CODEC_FLAG_GRAY)
692	break;
693	width = FFALIGN(s->width / 4, 16);
694	height = FFALIGN(s->height / 4, 16);
695	}
696
697	current = cur->data[i];
698
699	if (cur->pict_type == AV_PICTURE_TYPE_I) {
700	/* keyframe */
701	for (y = 0; y < height; y += 16) {
702	for (x = 0; x < width; x += 16) {
703	result = svq1_decode_block_intra(&s->gb, &current[x],
704	linesize);
705	if (result) {
706	av_log(avctx, AV_LOG_ERROR,
707	"Error in svq1_decode_block %i (keyframe)\n",
708	result);
709	goto err;
710	}
711	}
712	current += 16 * linesize;
713	}
714	} else {
715	/* delta frame */
716	uint8_t *previous = s->prev->data[i];
717	if (!previous ||
718	s->prev->width != s->width || s->prev->height != s->height) {
719	av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
720	result = AVERROR_INVALIDDATA;
721	goto err;
722	}
723
724	memset(pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv));
725
726	for (y = 0; y < height; y += 16) {
727	for (x = 0; x < width; x += 16) {
728	result = svq1_decode_delta_block(avctx, &s->hdsp,
729	&s->gb, &current[x],
730	previous, linesize,
731	pmv, x, y, width, height);
732	if (result != 0) {
733	ff_dlog(avctx,
734	"Error in svq1_decode_delta_block %i\n",
735	result);
736	goto err;
737	}
738	}
739
740	pmv[0].x =
741	pmv[0].y = 0;
742
743	current += 16 * linesize;
744	}
745	}
746	}
747
748	if (!s->nonref) {
749	av_frame_unref(s->prev);
750	result = av_frame_ref(s->prev, cur);
751	if (result < 0)
752	goto err;
753	}
754
755	*got_frame = 1;
756	result = buf_size;
757
758	err:
759	av_free(pmv);
760	return result;
761	}
762
763	static av_cold int svq1_decode_init(AVCodecContext *avctx)
764	{
765	SVQ1Context *s = avctx->priv_data;
766	int i;
767	int offset = 0;
768
769	s->prev = av_frame_alloc();
770	if (!s->prev)
771	return AVERROR(ENOMEM);
772
773	s->width = avctx->width + 3 & ~3;
774	s->height = avctx->height + 3 & ~3;
775	avctx->pix_fmt = AV_PIX_FMT_YUV410P;
776
777	ff_hpeldsp_init(&s->hdsp, avctx->flags);
778
779	INIT_VLC_STATIC(&svq1_block_type, 2, 4,
780	&ff_svq1_block_type_vlc[0][1], 2, 1,
781	&ff_svq1_block_type_vlc[0][0], 2, 1, 6);
782
783	INIT_VLC_STATIC(&svq1_motion_component, 7, 33,
784	&ff_mvtab[0][1], 2, 1,
785	&ff_mvtab[0][0], 2, 1, 176);
786
787	for (i = 0; i < 6; i++) {
788	static const uint8_t sizes[2][6] = { { 14, 10, 14, 18, 16, 18 },
789	{ 10, 10, 14, 14, 14, 16 } };
790	static VLC_TYPE table[168][2];
791	svq1_intra_multistage[i].table = &table[offset];
792	svq1_intra_multistage[i].table_allocated = sizes[0][i];
793	offset += sizes[0][i];
794	init_vlc(&svq1_intra_multistage[i], 3, 8,
795	&ff_svq1_intra_multistage_vlc[i][0][1], 2, 1,
796	&ff_svq1_intra_multistage_vlc[i][0][0], 2, 1,
797	INIT_VLC_USE_NEW_STATIC);
798	svq1_inter_multistage[i].table = &table[offset];
799	svq1_inter_multistage[i].table_allocated = sizes[1][i];
800	offset += sizes[1][i];
801	init_vlc(&svq1_inter_multistage[i], 3, 8,
802	&ff_svq1_inter_multistage_vlc[i][0][1], 2, 1,
803	&ff_svq1_inter_multistage_vlc[i][0][0], 2, 1,
804	INIT_VLC_USE_NEW_STATIC);
805	}
806
807	INIT_VLC_STATIC(&svq1_intra_mean, 8, 256,
808	&ff_svq1_intra_mean_vlc[0][1], 4, 2,
809	&ff_svq1_intra_mean_vlc[0][0], 4, 2, 632);
810
811	INIT_VLC_STATIC(&svq1_inter_mean, 9, 512,
812	&ff_svq1_inter_mean_vlc[0][1], 4, 2,
813	&ff_svq1_inter_mean_vlc[0][0], 4, 2, 1434);
814
815	return 0;
816	}
817
818	static av_cold int svq1_decode_end(AVCodecContext *avctx)
819	{
820	SVQ1Context *s = avctx->priv_data;
821
822	av_frame_free(&s->prev);
823	av_freep(&s->pkt_swapped);
824	s->pkt_swapped_allocated = 0;
825
826	return 0;
827	}
828
829	static void svq1_flush(AVCodecContext *avctx)
830	{
831	SVQ1Context *s = avctx->priv_data;
832
833	av_frame_unref(s->prev);
834	}
835
836	AVCodec ff_svq1_decoder = {
837	.name = "svq1",
838	.long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"),
839	.type = AVMEDIA_TYPE_VIDEO,
840	.id = AV_CODEC_ID_SVQ1,
841	.priv_data_size = sizeof(SVQ1Context),
842	.init = svq1_decode_init,
843	.close = svq1_decode_end,
844	.decode = svq1_decode_frame,
845	.capabilities = AV_CODEC_CAP_DR1,
846	.flush = svq1_flush,
847	.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV410P,
848	AV_PIX_FMT_NONE },
849	};
850