FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* Gremlin Digital Video (GDV) decoder
3			* Copyright (c) 2017 Konstantin Shishkov
4			* Copyright (c) 2017 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 "libavutil/common.h"
24			#include "avcodec.h"
25			#include "bytestream.h"
26			#include "codec_internal.h"
27			#include "decode.h"
28
29			typedef struct GDVContext {
30			AVCodecContext *avctx;
31
32			GetByteContext gb;
33			GetByteContext g2;
34			PutByteContext pb;
35
36			uint32_t pal[256];
37			uint8_t *frame;
38			unsigned frame_size;
39			unsigned scale_h, scale_v;
40			} GDVContext;
41
42			typedef struct Bits8 {
43			uint8_t queue;
44			uint8_t fill;
45			} Bits8;
46
47			typedef struct Bits32 {
48			uint32_t queue;
49			uint8_t fill;
50			} Bits32;
51
52			#define PREAMBLE_SIZE 4096
53
54		✗	static av_cold int gdv_decode_init(AVCodecContext *avctx)
55			{
56		✗	GDVContext *gdv = avctx->priv_data;
57			int i, j, k;
58
59		✗	avctx->pix_fmt = AV_PIX_FMT_PAL8;
60		✗	gdv->frame_size = avctx->width * avctx->height + PREAMBLE_SIZE;
61		✗	gdv->frame = av_calloc(gdv->frame_size, 1);
62		✗	if (!gdv->frame)
63		✗	return AVERROR(ENOMEM);
64
65		✗	for (i = 0; i < 2; i++) {
66		✗	for (j = 0; j < 256; j++) {
67		✗	for (k = 0; k < 8; k++) {
68		✗	gdv->frame[i * 2048 + j * 8 + k] = j;
69			}
70			}
71			}
72
73		✗	return 0;
74			}
75
76		✗	static void scaleup(uint8_t *dst, const uint8_t *src, int w)
77			{
78			int x;
79		✗	for (x = 0; x < w - 7; x+=8) {
80		✗	dst[x + 0] =
81		✗	dst[x + 1] = src[(x>>1) + 0];
82		✗	dst[x + 2] =
83		✗	dst[x + 3] = src[(x>>1) + 1];
84		✗	dst[x + 4] =
85		✗	dst[x + 5] = src[(x>>1) + 2];
86		✗	dst[x + 6] =
87		✗	dst[x + 7] = src[(x>>1) + 3];
88			}
89		✗	for (; x < w; x++) {
90		✗	dst[x] = src[(x>>1)];
91			}
92			}
93
94		✗	static void scaleup_rev(uint8_t *dst, const uint8_t *src, int w)
95			{
96			int x;
97
98		✗	for (x = w - 1; (x+1) & 7; x--) {
99		✗	dst[x] = src[(x>>1)];
100			}
101		✗	for (x -= 7; x >= 0; x -= 8) {
102		✗	dst[x + 6] =
103		✗	dst[x + 7] = src[(x>>1) + 3];
104		✗	dst[x + 4] =
105		✗	dst[x + 5] = src[(x>>1) + 2];
106		✗	dst[x + 2] =
107		✗	dst[x + 3] = src[(x>>1) + 1];
108		✗	dst[x + 0] =
109		✗	dst[x + 1] = src[(x>>1) + 0];
110			}
111			}
112
113		✗	static void scaledown(uint8_t *dst, const uint8_t *src, int w)
114			{
115			int x;
116		✗	for (x = 0; x < w - 7; x+=8) {
117		✗	dst[x + 0] = src[2*x + 0];
118		✗	dst[x + 1] = src[2*x + 2];
119		✗	dst[x + 2] = src[2*x + 4];
120		✗	dst[x + 3] = src[2*x + 6];
121		✗	dst[x + 4] = src[2*x + 8];
122		✗	dst[x + 5] = src[2*x +10];
123		✗	dst[x + 6] = src[2*x +12];
124		✗	dst[x + 7] = src[2*x +14];
125			}
126		✗	for (; x < w; x++) {
127		✗	dst[x] = src[2*x];
128			}
129			}
130
131		✗	static void rescale(GDVContext *gdv, uint8_t *dst, int w, int h, int scale_v, int scale_h)
132			{
133			int j, y;
134
135		✗	if ((gdv->scale_v == scale_v) && (gdv->scale_h == scale_h)) {
136		✗	return;
137			}
138
139		✗	if (gdv->scale_v) {
140		✗	for (j = 0; j < h; j++) {
141		✗	int y = h - j - 1;
142		✗	uint8_t *dst1 = dst + PREAMBLE_SIZE + y * w;
143		✗	uint8_t *src1 = dst + PREAMBLE_SIZE + (y>>!!gdv->scale_h) * (w>>1);
144
145		✗	scaleup_rev(dst1, src1, w);
146			}
147		✗	} else if (gdv->scale_h) {
148		✗	for (j = 0; j < h; j++) {
149		✗	int y = h - j - 1;
150		✗	uint8_t *dst1 = dst + PREAMBLE_SIZE + y * w;
151		✗	uint8_t *src1 = dst + PREAMBLE_SIZE + (y>>1) * w;
152		✗	memcpy(dst1, src1, w);
153			}
154			}
155
156		✗	if (scale_h && scale_v) {
157		✗	for (y = 0; y < (h>>1); y++) {
158		✗	uint8_t *dst1 = dst + PREAMBLE_SIZE + y * (w>>1);
159		✗	uint8_t *src1 = dst + PREAMBLE_SIZE + y*2 * w;
160		✗	scaledown(dst1, src1, w>>1);
161			}
162		✗	} else if (scale_h) {
163		✗	for (y = 0; y < (h>>1); y++) {
164		✗	uint8_t *dst1 = dst + PREAMBLE_SIZE + y * w;
165		✗	uint8_t *src1 = dst + PREAMBLE_SIZE + y*2 * w;
166		✗	memcpy(dst1, src1, w);
167			}
168		✗	} else if (scale_v) {
169		✗	for (y = 0; y < h; y++) {
170		✗	uint8_t *dst1 = dst + PREAMBLE_SIZE + y * w;
171		✗	scaledown(dst1, dst1, w>>1);
172			}
173			}
174
175		✗	gdv->scale_v = scale_v;
176		✗	gdv->scale_h = scale_h;
177			}
178
179		✗	static int read_bits2(Bits8 *bits, GetByteContext *gb)
180			{
181			int res;
182
183		✗	if (bits->fill == 0) {
184		✗	bits->queue |= bytestream2_get_byte(gb);
185		✗	bits->fill = 8;
186			}
187		✗	res = bits->queue >> 6;
188		✗	bits->queue <<= 2;
189		✗	bits->fill -= 2;
190
191		✗	return res;
192			}
193
194		✗	static void fill_bits32(Bits32 *bits, GetByteContext *gb)
195			{
196		✗	bits->queue = bytestream2_get_le32(gb);
197		✗	bits->fill = 32;
198			}
199
200		✗	static int read_bits32(Bits32 *bits, GetByteContext *gb, int nbits)
201			{
202		✗	int res = bits->queue & ((1 << nbits) - 1);
203
204		✗	bits->queue >>= nbits;
205		✗	bits->fill -= nbits;
206		✗	if (bits->fill <= 16) {
207		✗	bits->queue |= bytestream2_get_le16(gb) << bits->fill;
208		✗	bits->fill += 16;
209			}
210
211		✗	return res;
212			}
213
214		✗	static void lz_copy(PutByteContext *pb, GetByteContext *g2, int offset, unsigned len)
215			{
216			int i;
217
218		✗	if (offset == -1) {
219			int c;
220
221		✗	bytestream2_seek(g2, bytestream2_tell_p(pb) - 1, SEEK_SET);
222		✗	c = bytestream2_get_byte(g2);
223		✗	for (i = 0; i < len; i++) {
224		✗	bytestream2_put_byte(pb, c);
225			}
226		✗	} else if (offset < 0) {
227		✗	int start = bytestream2_tell_p(pb) - (-offset);
228
229		✗	bytestream2_seek(g2, start, SEEK_SET);
230		✗	for (i = 0; i < len; i++) {
231		✗	bytestream2_put_byte(pb, bytestream2_get_byte(g2));
232			}
233			} else {
234		✗	int start = bytestream2_tell_p(pb) + offset;
235
236		✗	bytestream2_seek(g2, start, SEEK_SET);
237		✗	for (i = 0; i < len; i++) {
238		✗	bytestream2_put_byte(pb, bytestream2_get_byte(g2));
239			}
240			}
241			}
242
243		✗	static int decompress_2(AVCodecContext *avctx)
244			{
245		✗	GDVContext *gdv = avctx->priv_data;
246		✗	GetByteContext *gb = &gdv->gb;
247		✗	GetByteContext *g2 = &gdv->g2;
248		✗	PutByteContext *pb = &gdv->pb;
249		✗	Bits8 bits = { 0 };
250			int c, i;
251
252		✗	bytestream2_init(g2, gdv->frame, gdv->frame_size);
253		✗	bytestream2_skip_p(pb, PREAMBLE_SIZE);
254
255		✗	for (c = 0; c < 256; c++) {
256		✗	for (i = 0; i < 16; i++) {
257		✗	gdv->frame[c * 16 + i] = c;
258			}
259			}
260
261		✗	while (bytestream2_get_bytes_left_p(pb) > 0 && bytestream2_get_bytes_left(gb) > 0) {
262		✗	int tag = read_bits2(&bits, gb);
263		✗	if (tag == 0) {
264		✗	bytestream2_put_byte(pb, bytestream2_get_byte(gb));
265		✗	} else if (tag == 1) {
266		✗	int b = bytestream2_get_byte(gb);
267		✗	int len = (b & 0xF) + 3;
268		✗	int top = (b >> 4) & 0xF;
269		✗	int off = (bytestream2_get_byte(gb) << 4) + top - 4096;
270		✗	lz_copy(pb, g2, off, len);
271		✗	} else if (tag == 2) {
272		✗	int len = (bytestream2_get_byte(gb)) + 2;
273		✗	bytestream2_skip_p(pb, len);
274			} else {
275		✗	break;
276			}
277			}
278
279		✗	if (bytestream2_get_bytes_left_p(pb) > 0)
280		✗	return AVERROR_INVALIDDATA;
281
282		✗	return 0;
283			}
284
285		✗	static int decompress_5(AVCodecContext *avctx, unsigned skip)
286			{
287		✗	GDVContext *gdv = avctx->priv_data;
288		✗	GetByteContext *gb = &gdv->gb;
289		✗	GetByteContext *g2 = &gdv->g2;
290		✗	PutByteContext *pb = &gdv->pb;
291		✗	Bits8 bits = { 0 };
292
293		✗	bytestream2_init(g2, gdv->frame, gdv->frame_size);
294		✗	bytestream2_skip_p(pb, skip + PREAMBLE_SIZE);
295
296		✗	while (bytestream2_get_bytes_left_p(pb) > 0 && bytestream2_get_bytes_left(gb) > 0) {
297		✗	int tag = read_bits2(&bits, gb);
298		✗	if (bytestream2_get_bytes_left(gb) < 1)
299		✗	return AVERROR_INVALIDDATA;
300		✗	if (tag == 0) {
301		✗	bytestream2_put_byte(pb, bytestream2_get_byte(gb));
302		✗	} else if (tag == 1) {
303		✗	int b = bytestream2_get_byte(gb);
304		✗	int len = (b & 0xF) + 3;
305		✗	int top = b >> 4;
306		✗	int off = (bytestream2_get_byte(gb) << 4) + top - 4096;
307		✗	lz_copy(pb, g2, off, len);
308		✗	} else if (tag == 2) {
309			int len;
310		✗	int b = bytestream2_get_byte(gb);
311		✗	if (b == 0) {
312		✗	return 0;
313			}
314		✗	if (b != 0xFF) {
315		✗	len = b;
316			} else {
317		✗	len = bytestream2_get_le16(gb);
318			}
319		✗	bytestream2_skip_p(pb, len + 1);
320			} else {
321		✗	int b = bytestream2_get_byte(gb);
322		✗	int len = (b & 0x3) + 2;
323		✗	int off = -(b >> 2) - 1;
324		✗	lz_copy(pb, g2, off, len);
325			}
326			}
327		✗	if (bytestream2_get_bytes_left_p(pb) > 0)
328		✗	return AVERROR_INVALIDDATA;
329		✗	return 0;
330			}
331
332		✗	static int decompress_68(AVCodecContext *avctx, unsigned skip, unsigned use8)
333			{
334		✗	GDVContext *gdv = avctx->priv_data;
335		✗	GetByteContext *gb = &gdv->gb;
336		✗	GetByteContext *g2 = &gdv->g2;
337		✗	PutByteContext *pb = &gdv->pb;
338			Bits32 bits;
339
340		✗	bytestream2_init(g2, gdv->frame, gdv->frame_size);
341		✗	bytestream2_skip_p(pb, skip + PREAMBLE_SIZE);
342		✗	fill_bits32(&bits, gb);
343
344		✗	while (bytestream2_get_bytes_left_p(pb) > 0 && bytestream2_get_bytes_left(gb) > 0) {
345		✗	int tag = read_bits32(&bits, gb, 2);
346		✗	if (tag == 0) {
347		✗	int b = read_bits32(&bits, gb, 1);
348		✗	if (b == 0) {
349		✗	bytestream2_put_byte(pb, bytestream2_get_byte(gb));
350			} else {
351		✗	int i, len = 2;
352		✗	int lbits = 0;
353		✗	while (1) {
354			int val;
355
356		✗	lbits += 1;
357		✗	val = read_bits32(&bits, gb, lbits);
358		✗	len += val;
359		✗	if (val != ((1 << lbits) - 1)) {
360		✗	break;
361			}
362		✗	if (lbits >= 16)
363		✗	return AVERROR_INVALIDDATA;
364			}
365		✗	for (i = 0; i < len; i++) {
366		✗	bytestream2_put_byte(pb, bytestream2_get_byte(gb));
367			}
368			}
369		✗	} else if (tag == 1) {
370		✗	int b = read_bits32(&bits, gb, 1);
371			int len;
372
373		✗	if (b == 0) {
374		✗	len = (read_bits32(&bits, gb, 4)) + 2;
375			} else {
376		✗	int bb = bytestream2_get_byte(gb);
377		✗	if ((bb & 0x80) == 0) {
378		✗	len = bb + 18;
379			} else {
380		✗	int top = (bb & 0x7F) << 8;
381		✗	len = top + bytestream2_get_byte(gb) + 146;
382			}
383			}
384		✗	bytestream2_skip_p(pb, len);
385		✗	} else if (tag == 2) {
386		✗	int i, subtag = read_bits32(&bits, gb, 2);
387
388		✗	if (subtag != 3) {
389		✗	int top = (read_bits32(&bits, gb, 4)) << 8;
390		✗	int offs = top + bytestream2_get_byte(gb);
391		✗	if ((subtag != 0) || (offs <= 0xF80)) {
392		✗	int len = (subtag) + 3;
393		✗	lz_copy(pb, g2, (offs) - 4096, len);
394			} else {
395			int real_off, len, c1, c2;
396
397		✗	if (offs == 0xFFF) {
398		✗	return 0;
399			}
400
401		✗	real_off = ((offs >> 4) & 0x7) + 1;
402		✗	len = ((offs & 0xF) + 2) * 2;
403		✗	c1 = gdv->frame[bytestream2_tell_p(pb) - real_off];
404		✗	c2 = gdv->frame[bytestream2_tell_p(pb) - real_off + 1];
405		✗	for (i = 0; i < len/2; i++) {
406		✗	bytestream2_put_byte(pb, c1);
407		✗	bytestream2_put_byte(pb, c2);
408			}
409			}
410			} else {
411		✗	int b = bytestream2_get_byte(gb);
412		✗	int off = ((b & 0x7F)) + 1;
413		✗	int len = ((b & 0x80) == 0) ? 2 : 3;
414
415		✗	lz_copy(pb, g2, -off, len);
416			}
417			} else {
418			int len;
419			int off;
420		✗	if (use8) {
421		✗	int q, b = bytestream2_get_byte(gb);
422		✗	if ((b & 0xC0) == 0xC0) {
423		✗	len = ((b & 0x3F)) + 8;
424		✗	q = read_bits32(&bits, gb, 4);
425		✗	off = (q << 8) + (bytestream2_get_byte(gb)) + 1;
426			} else {
427			int ofs1;
428		✗	if ((b & 0x80) == 0) {
429		✗	len = ((b >> 4)) + 6;
430		✗	ofs1 = (b & 0xF);
431			} else {
432		✗	len = ((b & 0x3F)) + 14;
433		✗	ofs1 = read_bits32(&bits, gb, 4);
434			}
435		✗	off = (ofs1 << 8) + (bytestream2_get_byte(gb)) - 4096;
436			}
437			} else {
438		✗	int ofs1, b = bytestream2_get_byte(gb);
439
440		✗	if ((b >> 4) == 0xF) {
441		✗	len = bytestream2_get_byte(gb) + 21;
442			} else {
443		✗	len = (b >> 4) + 6;
444			}
445		✗	ofs1 = (b & 0xF);
446		✗	off = (ofs1 << 8) + bytestream2_get_byte(gb) - 4096;
447			}
448		✗	lz_copy(pb, g2, off, len);
449			}
450			}
451
452		✗	if (bytestream2_get_bytes_left_p(pb) > 0)
453		✗	return AVERROR_INVALIDDATA;
454
455		✗	return 0;
456			}
457
458		✗	static int gdv_decode_frame(AVCodecContext *avctx, AVFrame *frame,
459			int *got_frame, AVPacket *avpkt)
460			{
461		✗	GDVContext *gdv = avctx->priv_data;
462		✗	GetByteContext *gb = &gdv->gb;
463		✗	PutByteContext *pb = &gdv->pb;
464			int ret, i;
465			int compression;
466			unsigned flags;
467			uint8_t *dst;
468
469		✗	bytestream2_init(gb, avpkt->data, avpkt->size);
470		✗	bytestream2_init_writer(pb, gdv->frame, gdv->frame_size);
471
472		✗	flags = bytestream2_get_le32(gb);
473		✗	compression = flags & 0xF;
474
475		✗	if (compression == 4 || compression == 7 || compression > 8)
476		✗	return AVERROR_INVALIDDATA;
477
478		✗	if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
479		✗	return ret;
480		✗	ff_copy_palette(gdv->pal, avpkt, avctx);
481
482		✗	if (compression < 2 && bytestream2_get_bytes_left(gb) < 256*3)
483		✗	return AVERROR_INVALIDDATA;
484		✗	rescale(gdv, gdv->frame, avctx->width, avctx->height,
485		✗	!!(flags & 0x10), !!(flags & 0x20));
486
487		✗	switch (compression) {
488		✗	case 1:
489		✗	memset(gdv->frame + PREAMBLE_SIZE, 0, gdv->frame_size - PREAMBLE_SIZE);
490		✗	case 0:
491		✗	for (i = 0; i < 256; i++) {
492		✗	unsigned r = bytestream2_get_byte(gb);
493		✗	unsigned g = bytestream2_get_byte(gb);
494		✗	unsigned b = bytestream2_get_byte(gb);
495		✗	gdv->pal[i] = 0xFFU << 24 | r << 18 | g << 10 | b << 2;
496			}
497		✗	break;
498		✗	case 2:
499		✗	ret = decompress_2(avctx);
500		✗	break;
501		✗	case 3:
502		✗	break;
503		✗	case 5:
504		✗	ret = decompress_5(avctx, flags >> 8);
505		✗	break;
506		✗	case 6:
507		✗	ret = decompress_68(avctx, flags >> 8, 0);
508		✗	break;
509		✗	case 8:
510		✗	ret = decompress_68(avctx, flags >> 8, 1);
511		✗	break;
512		✗	default:
513		✗	av_assert0(0);
514			}
515		✗	if (ret < 0)
516		✗	return ret;
517
518		✗	memcpy(frame->data[1], gdv->pal, AVPALETTE_SIZE);
519		✗	dst = frame->data[0];
520
521		✗	if (!gdv->scale_v && !gdv->scale_h) {
522		✗	int sidx = PREAMBLE_SIZE, didx = 0;
523			int y;
524
525		✗	for (y = 0; y < avctx->height; y++) {
526		✗	memcpy(dst + didx, gdv->frame + sidx, avctx->width);
527		✗	sidx += avctx->width;
528		✗	didx += frame->linesize[0];
529			}
530			} else {
531		✗	int sidx = PREAMBLE_SIZE, didx = 0;
532			int y;
533
534		✗	for (y = 0; y < avctx->height; y++) {
535		✗	if (!gdv->scale_v) {
536		✗	memcpy(dst + didx, gdv->frame + sidx, avctx->width);
537			} else {
538		✗	uint8_t *dst2 = dst + didx;
539		✗	uint8_t *src2 = gdv->frame + sidx;
540
541		✗	scaleup(dst2, src2, avctx->width);
542			}
543		✗	if (!gdv->scale_h || ((y & 1) == 1)) {
544		✗	sidx += !gdv->scale_v ? avctx->width : avctx->width/2;
545			}
546		✗	didx += frame->linesize[0];
547			}
548			}
549
550		✗	*got_frame = 1;
551
552		✗	return avpkt->size;
553			}
554
555		✗	static av_cold int gdv_decode_close(AVCodecContext *avctx)
556			{
557		✗	GDVContext *gdv = avctx->priv_data;
558		✗	av_freep(&gdv->frame);
559		✗	return 0;
560			}
561
562			const FFCodec ff_gdv_decoder = {
563			.p.name = "gdv",
564			CODEC_LONG_NAME("Gremlin Digital Video"),
565			.p.type = AVMEDIA_TYPE_VIDEO,
566			.p.id = AV_CODEC_ID_GDV,
567			.priv_data_size = sizeof(GDVContext),
568			.init = gdv_decode_init,
569			.close = gdv_decode_close,
570			FF_CODEC_DECODE_CB(gdv_decode_frame),
571			.p.capabilities = AV_CODEC_CAP_DR1,
572			};
573