Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / dfa.c
CommitLineData
2ba45a60
DM
1/*
2 * Chronomaster DFA Video Decoder
3 * Copyright (c) 2011 Konstantin Shishkov
4 * based on work by Vladimir "VAG" Gneushev
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 <inttypes.h>
24
25#include "avcodec.h"
26#include "bytestream.h"
27#include "internal.h"
28
29#include "libavutil/avassert.h"
30#include "libavutil/imgutils.h"
31#include "libavutil/mem.h"
32
33typedef struct DfaContext {
34 uint32_t pal[256];
35 uint8_t *frame_buf;
36} DfaContext;
37
38static av_cold int dfa_decode_init(AVCodecContext *avctx)
39{
40 DfaContext *s = avctx->priv_data;
41
42 avctx->pix_fmt = AV_PIX_FMT_PAL8;
43
44 if (!avctx->width || !avctx->height)
45 return AVERROR_INVALIDDATA;
46
47 av_assert0(av_image_check_size(avctx->width, avctx->height, 0, avctx) >= 0);
48
49 s->frame_buf = av_mallocz(avctx->width * avctx->height);
50 if (!s->frame_buf)
51 return AVERROR(ENOMEM);
52
53 return 0;
54}
55
56static int decode_copy(GetByteContext *gb, uint8_t *frame, int width, int height)
57{
58 const int size = width * height;
59
60 if (bytestream2_get_buffer(gb, frame, size) != size)
61 return AVERROR_INVALIDDATA;
62 return 0;
63}
64
65static int decode_tsw1(GetByteContext *gb, uint8_t *frame, int width, int height)
66{
67 const uint8_t *frame_start = frame;
68 const uint8_t *frame_end = frame + width * height;
69 int mask = 0x10000, bitbuf = 0;
70 int v, count, segments;
71 unsigned offset;
72
73 segments = bytestream2_get_le32(gb);
74 offset = bytestream2_get_le32(gb);
75 if (segments == 0 && offset == frame_end - frame)
76 return 0; // skip frame
77 if (frame_end - frame <= offset)
78 return AVERROR_INVALIDDATA;
79 frame += offset;
80 while (segments--) {
81 if (bytestream2_get_bytes_left(gb) < 2)
82 return AVERROR_INVALIDDATA;
83 if (mask == 0x10000) {
84 bitbuf = bytestream2_get_le16u(gb);
85 mask = 1;
86 }
87 if (frame_end - frame < 2)
88 return AVERROR_INVALIDDATA;
89 if (bitbuf & mask) {
90 v = bytestream2_get_le16(gb);
91 offset = (v & 0x1FFF) << 1;
92 count = ((v >> 13) + 2) << 1;
93 if (frame - frame_start < offset || frame_end - frame < count)
94 return AVERROR_INVALIDDATA;
95 av_memcpy_backptr(frame, offset, count);
96 frame += count;
97 } else {
98 *frame++ = bytestream2_get_byte(gb);
99 *frame++ = bytestream2_get_byte(gb);
100 }
101 mask <<= 1;
102 }
103
104 return 0;
105}
106
107static int decode_dsw1(GetByteContext *gb, uint8_t *frame, int width, int height)
108{
109 const uint8_t *frame_start = frame;
110 const uint8_t *frame_end = frame + width * height;
111 int mask = 0x10000, bitbuf = 0;
112 int v, offset, count, segments;
113
114 segments = bytestream2_get_le16(gb);
115 while (segments--) {
116 if (bytestream2_get_bytes_left(gb) < 2)
117 return AVERROR_INVALIDDATA;
118 if (mask == 0x10000) {
119 bitbuf = bytestream2_get_le16u(gb);
120 mask = 1;
121 }
122 if (frame_end - frame < 2)
123 return AVERROR_INVALIDDATA;
124 if (bitbuf & mask) {
125 v = bytestream2_get_le16(gb);
126 offset = (v & 0x1FFF) << 1;
127 count = ((v >> 13) + 2) << 1;
128 if (frame - frame_start < offset || frame_end - frame < count)
129 return AVERROR_INVALIDDATA;
130 av_memcpy_backptr(frame, offset, count);
131 frame += count;
132 } else if (bitbuf & (mask << 1)) {
133 frame += bytestream2_get_le16(gb);
134 } else {
135 *frame++ = bytestream2_get_byte(gb);
136 *frame++ = bytestream2_get_byte(gb);
137 }
138 mask <<= 2;
139 }
140
141 return 0;
142}
143
144static int decode_dds1(GetByteContext *gb, uint8_t *frame, int width, int height)
145{
146 const uint8_t *frame_start = frame;
147 const uint8_t *frame_end = frame + width * height;
148 int mask = 0x10000, bitbuf = 0;
149 int i, v, offset, count, segments;
150
151 segments = bytestream2_get_le16(gb);
152 while (segments--) {
153 if (bytestream2_get_bytes_left(gb) < 2)
154 return AVERROR_INVALIDDATA;
155 if (mask == 0x10000) {
156 bitbuf = bytestream2_get_le16u(gb);
157 mask = 1;
158 }
159
160 if (bitbuf & mask) {
161 v = bytestream2_get_le16(gb);
162 offset = (v & 0x1FFF) << 2;
163 count = ((v >> 13) + 2) << 1;
164 if (frame - frame_start < offset || frame_end - frame < count*2 + width)
165 return AVERROR_INVALIDDATA;
166 for (i = 0; i < count; i++) {
167 frame[0] = frame[1] =
168 frame[width] = frame[width + 1] = frame[-offset];
169
170 frame += 2;
171 }
172 } else if (bitbuf & (mask << 1)) {
173 v = bytestream2_get_le16(gb)*2;
174 if (frame - frame_end < v)
175 return AVERROR_INVALIDDATA;
176 frame += v;
177 } else {
178 if (frame_end - frame < width + 3)
179 return AVERROR_INVALIDDATA;
180 frame[0] = frame[1] =
181 frame[width] = frame[width + 1] = bytestream2_get_byte(gb);
182 frame += 2;
183 frame[0] = frame[1] =
184 frame[width] = frame[width + 1] = bytestream2_get_byte(gb);
185 frame += 2;
186 }
187 mask <<= 2;
188 }
189
190 return 0;
191}
192
193static int decode_bdlt(GetByteContext *gb, uint8_t *frame, int width, int height)
194{
195 uint8_t *line_ptr;
196 int count, lines, segments;
197
198 count = bytestream2_get_le16(gb);
199 if (count >= height)
200 return AVERROR_INVALIDDATA;
201 frame += width * count;
202 lines = bytestream2_get_le16(gb);
203 if (count + lines > height)
204 return AVERROR_INVALIDDATA;
205
206 while (lines--) {
207 if (bytestream2_get_bytes_left(gb) < 1)
208 return AVERROR_INVALIDDATA;
209 line_ptr = frame;
210 frame += width;
211 segments = bytestream2_get_byteu(gb);
212 while (segments--) {
213 if (frame - line_ptr <= bytestream2_peek_byte(gb))
214 return AVERROR_INVALIDDATA;
215 line_ptr += bytestream2_get_byte(gb);
216 count = (int8_t)bytestream2_get_byte(gb);
217 if (count >= 0) {
218 if (frame - line_ptr < count)
219 return AVERROR_INVALIDDATA;
220 if (bytestream2_get_buffer(gb, line_ptr, count) != count)
221 return AVERROR_INVALIDDATA;
222 } else {
223 count = -count;
224 if (frame - line_ptr < count)
225 return AVERROR_INVALIDDATA;
226 memset(line_ptr, bytestream2_get_byte(gb), count);
227 }
228 line_ptr += count;
229 }
230 }
231
232 return 0;
233}
234
235static int decode_wdlt(GetByteContext *gb, uint8_t *frame, int width, int height)
236{
237 const uint8_t *frame_end = frame + width * height;
238 uint8_t *line_ptr;
239 int count, i, v, lines, segments;
240 int y = 0;
241
242 lines = bytestream2_get_le16(gb);
243 if (lines > height)
244 return AVERROR_INVALIDDATA;
245
246 while (lines--) {
247 if (bytestream2_get_bytes_left(gb) < 2)
248 return AVERROR_INVALIDDATA;
249 segments = bytestream2_get_le16u(gb);
250 while ((segments & 0xC000) == 0xC000) {
251 unsigned skip_lines = -(int16_t)segments;
252 unsigned delta = -((int16_t)segments * width);
253 if (frame_end - frame <= delta || y + lines + skip_lines > height)
254 return AVERROR_INVALIDDATA;
255 frame += delta;
256 y += skip_lines;
257 segments = bytestream2_get_le16(gb);
258 }
259
260 if (frame_end <= frame)
261 return AVERROR_INVALIDDATA;
262 if (segments & 0x8000) {
263 frame[width - 1] = segments & 0xFF;
264 segments = bytestream2_get_le16(gb);
265 }
266 line_ptr = frame;
267 if (frame_end - frame < width)
268 return AVERROR_INVALIDDATA;
269 frame += width;
270 y++;
271 while (segments--) {
272 if (frame - line_ptr <= bytestream2_peek_byte(gb))
273 return AVERROR_INVALIDDATA;
274 line_ptr += bytestream2_get_byte(gb);
275 count = (int8_t)bytestream2_get_byte(gb);
276 if (count >= 0) {
277 if (frame - line_ptr < count * 2)
278 return AVERROR_INVALIDDATA;
279 if (bytestream2_get_buffer(gb, line_ptr, count * 2) != count * 2)
280 return AVERROR_INVALIDDATA;
281 line_ptr += count * 2;
282 } else {
283 count = -count;
284 if (frame - line_ptr < count * 2)
285 return AVERROR_INVALIDDATA;
286 v = bytestream2_get_le16(gb);
287 for (i = 0; i < count; i++)
288 bytestream_put_le16(&line_ptr, v);
289 }
290 }
291 }
292
293 return 0;
294}
295
296static int decode_tdlt(GetByteContext *gb, uint8_t *frame, int width, int height)
297{
298 const uint8_t *frame_end = frame + width * height;
299 uint32_t segments = bytestream2_get_le32(gb);
300 int skip, copy;
301
302 while (segments--) {
303 if (bytestream2_get_bytes_left(gb) < 2)
304 return AVERROR_INVALIDDATA;
305 copy = bytestream2_get_byteu(gb) * 2;
306 skip = bytestream2_get_byteu(gb) * 2;
307 if (frame_end - frame < copy + skip ||
308 bytestream2_get_bytes_left(gb) < copy)
309 return AVERROR_INVALIDDATA;
310 frame += skip;
311 bytestream2_get_buffer(gb, frame, copy);
312 frame += copy;
313 }
314
315 return 0;
316}
317
318static int decode_blck(GetByteContext *gb, uint8_t *frame, int width, int height)
319{
320 memset(frame, 0, width * height);
321 return 0;
322}
323
324
325typedef int (*chunk_decoder)(GetByteContext *gb, uint8_t *frame, int width, int height);
326
327static const chunk_decoder decoder[8] = {
328 decode_copy, decode_tsw1, decode_bdlt, decode_wdlt,
329 decode_tdlt, decode_dsw1, decode_blck, decode_dds1,
330};
331
332static const char* chunk_name[8] = {
333 "COPY", "TSW1", "BDLT", "WDLT", "TDLT", "DSW1", "BLCK", "DDS1"
334};
335
336static int dfa_decode_frame(AVCodecContext *avctx,
337 void *data, int *got_frame,
338 AVPacket *avpkt)
339{
340 AVFrame *frame = data;
341 DfaContext *s = avctx->priv_data;
342 GetByteContext gb;
343 const uint8_t *buf = avpkt->data;
344 uint32_t chunk_type, chunk_size;
345 uint8_t *dst;
346 int ret;
347 int i, pal_elems;
348 int version = avctx->extradata_size==2 ? AV_RL16(avctx->extradata) : 0;
349
350 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
351 return ret;
352
353 bytestream2_init(&gb, avpkt->data, avpkt->size);
354 while (bytestream2_get_bytes_left(&gb) > 0) {
355 bytestream2_skip(&gb, 4);
356 chunk_size = bytestream2_get_le32(&gb);
357 chunk_type = bytestream2_get_le32(&gb);
358 if (!chunk_type)
359 break;
360 if (chunk_type == 1) {
361 pal_elems = FFMIN(chunk_size / 3, 256);
362 for (i = 0; i < pal_elems; i++) {
363 s->pal[i] = bytestream2_get_be24(&gb) << 2;
364 s->pal[i] |= 0xFFU << 24 | (s->pal[i] >> 6) & 0x30303;
365 }
366 frame->palette_has_changed = 1;
367 } else if (chunk_type <= 9) {
368 if (decoder[chunk_type - 2](&gb, s->frame_buf, avctx->width, avctx->height)) {
369 av_log(avctx, AV_LOG_ERROR, "Error decoding %s chunk\n",
370 chunk_name[chunk_type - 2]);
371 return AVERROR_INVALIDDATA;
372 }
373 } else {
374 av_log(avctx, AV_LOG_WARNING,
375 "Ignoring unknown chunk type %"PRIu32"\n",
376 chunk_type);
377 }
378 buf += chunk_size;
379 }
380
381 buf = s->frame_buf;
382 dst = frame->data[0];
383 for (i = 0; i < avctx->height; i++) {
384 if(version == 0x100) {
385 int j;
386 for(j = 0; j < avctx->width; j++) {
387 dst[j] = buf[ (i&3)*(avctx->width /4) + (j/4) +
388 ((j&3)*(avctx->height/4) + (i/4))*avctx->width];
389 }
390 } else {
391 memcpy(dst, buf, avctx->width);
392 buf += avctx->width;
393 }
394 dst += frame->linesize[0];
395 }
396 memcpy(frame->data[1], s->pal, sizeof(s->pal));
397
398 *got_frame = 1;
399
400 return avpkt->size;
401}
402
403static av_cold int dfa_decode_end(AVCodecContext *avctx)
404{
405 DfaContext *s = avctx->priv_data;
406
407 av_freep(&s->frame_buf);
408
409 return 0;
410}
411
412AVCodec ff_dfa_decoder = {
413 .name = "dfa",
414 .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
415 .type = AVMEDIA_TYPE_VIDEO,
416 .id = AV_CODEC_ID_DFA,
417 .priv_data_size = sizeof(DfaContext),
418 .init = dfa_decode_init,
419 .close = dfa_decode_end,
420 .decode = dfa_decode_frame,
421 .capabilities = CODEC_CAP_DR1,
422};