lavc decoders: work with refcounted frames.
[libav.git] / libavcodec / flashsv.c
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1/*
2 * Flash Screen Video decoder
3 * Copyright (C) 2004 Alex Beregszaszi
4 * Copyright (C) 2006 Benjamin Larsson
5 *
2912e87a 6 * This file is part of Libav.
b78e7197 7 *
2912e87a 8 * Libav is free software; you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
b78e7197 11 * version 2.1 of the License, or (at your option) any later version.
0919e788 12 *
2912e87a 13 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 19 * License along with Libav; if not, write to the Free Software
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20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
ba87f080 24 * @file
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25 * Flash Screen Video decoder
26 * @author Alex Beregszaszi
27 * @author Benjamin Larsson
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28 * @author Daniel Verkamp
29 * @author Konstantin Shishkov
0919e788 30 *
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31 * A description of the bitstream format for Flash Screen Video version 1/2
32 * is part of the SWF File Format Specification (version 10), which can be
33 * downloaded from http://www.adobe.com/devnet/swf.html.
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34 */
35
36#include <stdio.h>
37#include <stdlib.h>
293fe6da 38#include <zlib.h>
0919e788 39
c2d23309 40#include "libavutil/intreadwrite.h"
0919e788 41#include "avcodec.h"
c2d23309 42#include "bytestream.h"
9106a698 43#include "get_bits.h"
759001c5 44#include "internal.h"
0919e788 45
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46typedef struct BlockInfo {
47 uint8_t *pos;
48 int size;
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49} BlockInfo;
50
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51typedef struct FlashSVContext {
52 AVCodecContext *avctx;
293fe6da
DB
53 AVFrame frame;
54 int image_width, image_height;
55 int block_width, block_height;
56 uint8_t *tmpblock;
57 int block_size;
58 z_stream zstream;
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59 int ver;
60 const uint32_t *pal;
61 int is_keyframe;
62 uint8_t *keyframedata;
63 uint8_t *keyframe;
64 BlockInfo *blocks;
65 uint8_t *deflate_block;
66 int deflate_block_size;
67 int color_depth;
68 int zlibprime_curr, zlibprime_prev;
69 int diff_start, diff_height;
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70} FlashSVContext;
71
72
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73static int decode_hybrid(const uint8_t *sptr, uint8_t *dptr, int dx, int dy,
74 int h, int w, int stride, const uint32_t *pal)
75{
76 int x, y;
77 const uint8_t *orig_src = sptr;
78
79 for (y = dx+h; y > dx; y--) {
80 uint8_t *dst = dptr + (y * stride) + dy * 3;
81 for (x = 0; x < w; x++) {
82 if (*sptr & 0x80) {
83 /* 15-bit color */
84 unsigned c = AV_RB16(sptr) & ~0x8000;
85 unsigned b = c & 0x1F;
86 unsigned g = (c >> 5) & 0x1F;
87 unsigned r = c >> 10;
88 /* 000aaabb -> aaabbaaa */
89 *dst++ = (b << 3) | (b >> 2);
90 *dst++ = (g << 3) | (g >> 2);
91 *dst++ = (r << 3) | (r >> 2);
92 sptr += 2;
93 } else {
94 /* palette index */
95 uint32_t c = pal[*sptr++];
96 bytestream_put_le24(&dst, c);
97 }
98 }
99 }
100 return sptr - orig_src;
101}
102
98a6fff9 103static av_cold int flashsv_decode_init(AVCodecContext *avctx)
0919e788 104{
e4141433 105 FlashSVContext *s = avctx->priv_data;
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106 int zret; // Zlib return code
107
293fe6da 108 s->avctx = avctx;
0919e788 109 s->zstream.zalloc = Z_NULL;
293fe6da 110 s->zstream.zfree = Z_NULL;
0919e788 111 s->zstream.opaque = Z_NULL;
cabc2938 112 zret = inflateInit(&s->zstream);
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113 if (zret != Z_OK) {
114 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
115 return 1;
116 }
716d413c 117 avctx->pix_fmt = AV_PIX_FMT_BGR24;
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118 s->frame.data[0] = NULL;
119
120 return 0;
121}
122
123
17fecb4a 124static int flashsv2_prime(FlashSVContext *s, uint8_t *src, int size)
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125{
126 z_stream zs;
c466eb17 127 int zret; // Zlib return code
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128
129 zs.zalloc = NULL;
130 zs.zfree = NULL;
131 zs.opaque = NULL;
132
133 s->zstream.next_in = src;
134 s->zstream.avail_in = size;
135 s->zstream.next_out = s->tmpblock;
136 s->zstream.avail_out = s->block_size * 3;
137 inflate(&s->zstream, Z_SYNC_FLUSH);
138
139 deflateInit(&zs, 0);
140 zs.next_in = s->tmpblock;
141 zs.avail_in = s->block_size * 3 - s->zstream.avail_out;
142 zs.next_out = s->deflate_block;
143 zs.avail_out = s->deflate_block_size;
144 deflate(&zs, Z_SYNC_FLUSH);
145 deflateEnd(&zs);
146
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147 if ((zret = inflateReset(&s->zstream)) != Z_OK) {
148 av_log(s->avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
149 return AVERROR_UNKNOWN;
150 }
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151
152 s->zstream.next_in = s->deflate_block;
153 s->zstream.avail_in = s->deflate_block_size - zs.avail_out;
154 s->zstream.next_out = s->tmpblock;
155 s->zstream.avail_out = s->block_size * 3;
156 inflate(&s->zstream, Z_SYNC_FLUSH);
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157
158 return 0;
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159}
160
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161static int flashsv_decode_block(AVCodecContext *avctx, AVPacket *avpkt,
162 GetBitContext *gb, int block_size,
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163 int width, int height, int x_pos, int y_pos,
164 int blk_idx)
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165{
166 struct FlashSVContext *s = avctx->priv_data;
167 uint8_t *line = s->tmpblock;
168 int k;
169 int ret = inflateReset(&s->zstream);
170 if (ret != Z_OK) {
c466eb17
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171 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
172 return AVERROR_UNKNOWN;
b8783b98 173 }
c2d23309 174 if (s->zlibprime_curr || s->zlibprime_prev) {
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DB
175 ret = flashsv2_prime(s,
176 s->blocks[blk_idx].pos,
177 s->blocks[blk_idx].size);
c466eb17
JG
178 if (ret < 0)
179 return ret;
c2d23309 180 }
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181 s->zstream.next_in = avpkt->data + get_bits_count(gb) / 8;
182 s->zstream.avail_in = block_size;
183 s->zstream.next_out = s->tmpblock;
184 s->zstream.avail_out = s->block_size * 3;
185 ret = inflate(&s->zstream, Z_FINISH);
186 if (ret == Z_DATA_ERROR) {
187 av_log(avctx, AV_LOG_ERROR, "Zlib resync occurred\n");
188 inflateSync(&s->zstream);
189 ret = inflate(&s->zstream, Z_FINISH);
190 }
191
192 if (ret != Z_OK && ret != Z_STREAM_END) {
193 //return -1;
194 }
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195
196 if (s->is_keyframe) {
197 s->blocks[blk_idx].pos = s->keyframedata + (get_bits_count(gb) / 8);
198 s->blocks[blk_idx].size = block_size;
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199 }
200 if (!s->color_depth) {
201 /* Flash Screen Video stores the image upside down, so copy
202 * lines to destination in reverse order. */
203 for (k = 1; k <= s->diff_height; k++) {
204 memcpy(s->frame.data[0] + x_pos * 3 +
205 (s->image_height - y_pos - s->diff_start - k) * s->frame.linesize[0],
206 line, width * 3);
207 /* advance source pointer to next line */
208 line += width * 3;
209 }
210 } else {
211 /* hybrid 15-bit/palette mode */
212 decode_hybrid(s->tmpblock, s->frame.data[0],
213 s->image_height - (y_pos + 1 + s->diff_start + s->diff_height),
214 x_pos, s->diff_height, width,
215 s->frame.linesize[0], s->pal);
b8783b98
DB
216 }
217 skip_bits_long(gb, 8 * block_size); /* skip the consumed bits */
218 return 0;
219}
220
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221static int calc_deflate_block_size(int tmpblock_size)
222{
223 z_stream zstream;
224 int size;
225
226 zstream.zalloc = Z_NULL;
227 zstream.zfree = Z_NULL;
228 zstream.opaque = Z_NULL;
229 if (deflateInit(&zstream, 0) != Z_OK)
230 return -1;
231 size = deflateBound(&zstream, tmpblock_size);
232 deflateEnd(&zstream);
233
234 return size;
235}
b8783b98 236
293fe6da 237static int flashsv_decode_frame(AVCodecContext *avctx, void *data,
df9b9567 238 int *got_frame, AVPacket *avpkt)
0919e788 239{
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DB
240 int buf_size = avpkt->size;
241 FlashSVContext *s = avctx->priv_data;
759001c5 242 int h_blocks, v_blocks, h_part, v_part, i, j, ret;
0919e788
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243 GetBitContext gb;
244
245 /* no supplementary picture */
246 if (buf_size == 0)
247 return 0;
b8fb21e9
LA
248 if (buf_size < 4)
249 return -1;
0919e788 250
a082e680 251 init_get_bits(&gb, avpkt->data, buf_size * 8);
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252
253 /* start to parse the bitstream */
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254 s->block_width = 16 * (get_bits(&gb, 4) + 1);
255 s->image_width = get_bits(&gb, 12);
256 s->block_height = 16 * (get_bits(&gb, 4) + 1);
257 s->image_height = get_bits(&gb, 12);
0919e788 258
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259 if (s->ver == 2) {
260 skip_bits(&gb, 6);
261 if (get_bits1(&gb)) {
262 av_log_missing_feature(avctx, "iframe", 1);
263 return AVERROR_PATCHWELCOME;
264 }
265 if (get_bits1(&gb)) {
8f4c414d 266 av_log_missing_feature(avctx, "Custom palette", 1);
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267 return AVERROR_PATCHWELCOME;
268 }
269 }
270
dc900310 271 /* calculate number of blocks and size of border (partial) blocks */
293fe6da
DB
272 h_blocks = s->image_width / s->block_width;
273 h_part = s->image_width % s->block_width;
0919e788 274 v_blocks = s->image_height / s->block_height;
293fe6da 275 v_part = s->image_height % s->block_height;
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276
277 /* the block size could change between frames, make sure the buffer
278 * is large enough, if not, get a larger one */
293fe6da 279 if (s->block_size < s->block_width * s->block_height) {
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280 int tmpblock_size = 3 * s->block_width * s->block_height;
281
282 s->tmpblock = av_realloc(s->tmpblock, tmpblock_size);
283 if (!s->tmpblock) {
0919e788 284 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
a14c0824 285 return AVERROR(ENOMEM);
0919e788 286 }
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287 if (s->ver == 2) {
288 s->deflate_block_size = calc_deflate_block_size(tmpblock_size);
289 if (s->deflate_block_size <= 0) {
290 av_log(avctx, AV_LOG_ERROR, "Can't determine deflate buffer size.\n");
291 return -1;
292 }
293 s->deflate_block = av_realloc(s->deflate_block, s->deflate_block_size);
294 if (!s->deflate_block) {
295 av_log(avctx, AV_LOG_ERROR, "Can't allocate deflate buffer.\n");
296 return AVERROR(ENOMEM);
297 }
298 }
0919e788 299 }
293fe6da 300 s->block_size = s->block_width * s->block_height;
0919e788 301
dc900310 302 /* initialize the image size once */
cabc2938 303 if (avctx->width == 0 && avctx->height == 0) {
293fe6da 304 avctx->width = s->image_width;
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305 avctx->height = s->image_height;
306 }
307
308 /* check for changes of image width and image height */
cabc2938 309 if (avctx->width != s->image_width || avctx->height != s->image_height) {
94023020 310 av_log(avctx, AV_LOG_ERROR,
f9a9c8f9 311 "Frame width or height differs from first frame!\n");
94023020
DB
312 av_log(avctx, AV_LOG_ERROR, "fh = %d, fv %d vs ch = %d, cv = %d\n",
313 avctx->height, avctx->width, s->image_height, s->image_width);
dbf5b95d 314 return AVERROR_INVALIDDATA;
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315 }
316
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317 /* we care for keyframes only in Screen Video v2 */
318 s->is_keyframe = (avpkt->flags & AV_PKT_FLAG_KEY) && (s->ver == 2);
319 if (s->is_keyframe) {
320 s->keyframedata = av_realloc(s->keyframedata, avpkt->size);
321 memcpy(s->keyframedata, avpkt->data, avpkt->size);
322 s->blocks = av_realloc(s->blocks,
323 (v_blocks + !!v_part) * (h_blocks + !!h_part)
324 * sizeof(s->blocks[0]));
325 }
326
9b576e4d
DB
327 av_dlog(avctx, "image: %dx%d block: %dx%d num: %dx%d part: %dx%d\n",
328 s->image_width, s->image_height, s->block_width, s->block_height,
329 h_blocks, v_blocks, h_part, v_part);
0919e788 330
759001c5 331 if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0) {
293fe6da 332 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
759001c5 333 return ret;
0919e788
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334 }
335
336 /* loop over all block columns */
293fe6da 337 for (j = 0; j < v_blocks + (v_part ? 1 : 0); j++) {
0919e788 338
91fe7769
DB
339 int y_pos = j * s->block_height; // vertical position in frame
340 int cur_blk_height = (j < v_blocks) ? s->block_height : v_part;
0919e788
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341
342 /* loop over all block rows */
293fe6da 343 for (i = 0; i < h_blocks + (h_part ? 1 : 0); i++) {
91fe7769
DB
344 int x_pos = i * s->block_width; // horizontal position in frame
345 int cur_blk_width = (i < h_blocks) ? s->block_width : h_part;
c2d23309 346 int has_diff = 0;
0919e788
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347
348 /* get the size of the compressed zlib chunk */
349 int size = get_bits(&gb, 16);
c2d23309
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350
351 s->color_depth = 0;
352 s->zlibprime_curr = 0;
353 s->zlibprime_prev = 0;
354 s->diff_start = 0;
355 s->diff_height = cur_blk_height;
356
b8fb21e9 357 if (8 * size > get_bits_left(&gb)) {
759001c5 358 av_frame_unref(&s->frame);
dbf5b95d 359 return AVERROR_INVALIDDATA;
b8fb21e9 360 }
0919e788 361
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362 if (s->ver == 2 && size) {
363 skip_bits(&gb, 3);
364 s->color_depth = get_bits(&gb, 2);
365 has_diff = get_bits1(&gb);
366 s->zlibprime_curr = get_bits1(&gb);
367 s->zlibprime_prev = get_bits1(&gb);
368
369 if (s->color_depth != 0 && s->color_depth != 2) {
370 av_log(avctx, AV_LOG_ERROR,
371 "%dx%d invalid color depth %d\n", i, j, s->color_depth);
4b7f4908 372 return AVERROR_INVALIDDATA;
c2d23309
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373 }
374
375 if (has_diff) {
5ae72f54
JG
376 if (!s->keyframe) {
377 av_log(avctx, AV_LOG_ERROR,
378 "inter frame without keyframe\n");
379 return AVERROR_INVALIDDATA;
380 }
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381 s->diff_start = get_bits(&gb, 8);
382 s->diff_height = get_bits(&gb, 8);
383 av_log(avctx, AV_LOG_DEBUG,
384 "%dx%d diff start %d height %d\n",
385 i, j, s->diff_start, s->diff_height);
386 size -= 2;
387 }
388
389 if (s->zlibprime_prev)
390 av_log(avctx, AV_LOG_DEBUG, "%dx%d zlibprime_prev\n", i, j);
391
392 if (s->zlibprime_curr) {
393 int col = get_bits(&gb, 8);
394 int row = get_bits(&gb, 8);
395 av_log(avctx, AV_LOG_DEBUG, "%dx%d zlibprime_curr %dx%d\n", i, j, col, row);
396 size -= 2;
397 av_log_missing_feature(avctx, "zlibprime_curr", 1);
398 return AVERROR_PATCHWELCOME;
399 }
3ae69b91
JG
400 if (!s->blocks && (s->zlibprime_curr || s->zlibprime_prev)) {
401 av_log(avctx, AV_LOG_ERROR, "no data available for zlib "
402 "priming\n");
403 return AVERROR_INVALIDDATA;
404 }
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405 size--; // account for flags byte
406 }
407
408 if (has_diff) {
409 int k;
410 int off = (s->image_height - y_pos - 1) * s->frame.linesize[0];
411
412 for (k = 0; k < cur_blk_height; k++)
413 memcpy(s->frame.data[0] + off - k*s->frame.linesize[0] + x_pos*3,
414 s->keyframe + off - k*s->frame.linesize[0] + x_pos*3,
415 cur_blk_width * 3);
416 }
417
39884ab0
DB
418 /* skip unchanged blocks, which have size 0 */
419 if (size) {
b8783b98
DB
420 if (flashsv_decode_block(avctx, avpkt, &gb, size,
421 cur_blk_width, cur_blk_height,
c2d23309
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422 x_pos, y_pos,
423 i + j * (h_blocks + !!h_part)))
94023020 424 av_log(avctx, AV_LOG_ERROR,
b8783b98 425 "error in decompression of block %dx%d\n", i, j);
0919e788
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426 }
427 }
428 }
c2d23309
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429 if (s->is_keyframe && s->ver == 2) {
430 if (!s->keyframe) {
431 s->keyframe = av_malloc(s->frame.linesize[0] * avctx->height);
432 if (!s->keyframe) {
433 av_log(avctx, AV_LOG_ERROR, "Cannot allocate image data\n");
434 return AVERROR(ENOMEM);
435 }
436 }
437 memcpy(s->keyframe, s->frame.data[0], s->frame.linesize[0] * avctx->height);
438 }
0919e788 439
759001c5
AK
440 if ((ret = av_frame_ref(data, &s->frame)) < 0)
441 return ret;
442
df9b9567 443 *got_frame = 1;
0919e788 444
293fe6da 445 if ((get_bits_count(&gb) / 8) != buf_size)
0919e788 446 av_log(avctx, AV_LOG_ERROR, "buffer not fully consumed (%d != %d)\n",
293fe6da 447 buf_size, (get_bits_count(&gb) / 8));
0919e788
BL
448
449 /* report that the buffer was completely consumed */
450 return buf_size;
451}
452
453
98a6fff9 454static av_cold int flashsv_decode_end(AVCodecContext *avctx)
0919e788 455{
e4141433 456 FlashSVContext *s = avctx->priv_data;
cabc2938 457 inflateEnd(&s->zstream);
0919e788 458 /* release the frame if needed */
759001c5 459 av_frame_unref(&s->frame);
0919e788
BL
460
461 /* free the tmpblock */
437fb1c8 462 av_free(s->tmpblock);
0919e788
BL
463
464 return 0;
465}
466
467
c2d23309 468#if CONFIG_FLASHSV_DECODER
d36beb3f 469AVCodec ff_flashsv_decoder = {
46cb2da1
DB
470 .name = "flashsv",
471 .type = AVMEDIA_TYPE_VIDEO,
36ef5369 472 .id = AV_CODEC_ID_FLASHSV,
46cb2da1
DB
473 .priv_data_size = sizeof(FlashSVContext),
474 .init = flashsv_decode_init,
475 .close = flashsv_decode_end,
476 .decode = flashsv_decode_frame,
477 .capabilities = CODEC_CAP_DR1,
716d413c 478 .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
46cb2da1 479 .long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video v1"),
0919e788 480};
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481#endif /* CONFIG_FLASHSV_DECODER */
482
483#if CONFIG_FLASHSV2_DECODER
484static const uint32_t ff_flashsv2_default_palette[128] = {
485 0x000000, 0x333333, 0x666666, 0x999999, 0xCCCCCC, 0xFFFFFF,
486 0x330000, 0x660000, 0x990000, 0xCC0000, 0xFF0000, 0x003300,
487 0x006600, 0x009900, 0x00CC00, 0x00FF00, 0x000033, 0x000066,
488 0x000099, 0x0000CC, 0x0000FF, 0x333300, 0x666600, 0x999900,
489 0xCCCC00, 0xFFFF00, 0x003333, 0x006666, 0x009999, 0x00CCCC,
490 0x00FFFF, 0x330033, 0x660066, 0x990099, 0xCC00CC, 0xFF00FF,
491 0xFFFF33, 0xFFFF66, 0xFFFF99, 0xFFFFCC, 0xFF33FF, 0xFF66FF,
492 0xFF99FF, 0xFFCCFF, 0x33FFFF, 0x66FFFF, 0x99FFFF, 0xCCFFFF,
493 0xCCCC33, 0xCCCC66, 0xCCCC99, 0xCCCCFF, 0xCC33CC, 0xCC66CC,
494 0xCC99CC, 0xCCFFCC, 0x33CCCC, 0x66CCCC, 0x99CCCC, 0xFFCCCC,
495 0x999933, 0x999966, 0x9999CC, 0x9999FF, 0x993399, 0x996699,
496 0x99CC99, 0x99FF99, 0x339999, 0x669999, 0xCC9999, 0xFF9999,
497 0x666633, 0x666699, 0x6666CC, 0x6666FF, 0x663366, 0x669966,
498 0x66CC66, 0x66FF66, 0x336666, 0x996666, 0xCC6666, 0xFF6666,
499 0x333366, 0x333399, 0x3333CC, 0x3333FF, 0x336633, 0x339933,
500 0x33CC33, 0x33FF33, 0x663333, 0x993333, 0xCC3333, 0xFF3333,
501 0x003366, 0x336600, 0x660033, 0x006633, 0x330066, 0x663300,
502 0x336699, 0x669933, 0x993366, 0x339966, 0x663399, 0x996633,
503 0x6699CC, 0x99CC66, 0xCC6699, 0x66CC99, 0x9966CC, 0xCC9966,
504 0x99CCFF, 0xCCFF99, 0xFF99CC, 0x99FFCC, 0xCC99FF, 0xFFCC99,
505 0x111111, 0x222222, 0x444444, 0x555555, 0xAAAAAA, 0xBBBBBB,
506 0xDDDDDD, 0xEEEEEE
507};
508
509static av_cold int flashsv2_decode_init(AVCodecContext *avctx)
510{
511 FlashSVContext *s = avctx->priv_data;
512 flashsv_decode_init(avctx);
513 s->pal = ff_flashsv2_default_palette;
514 s->ver = 2;
515
516 return 0;
517}
518
519static av_cold int flashsv2_decode_end(AVCodecContext *avctx)
520{
521 FlashSVContext *s = avctx->priv_data;
522
523 av_freep(&s->keyframedata);
524 av_freep(&s->blocks);
525 av_freep(&s->keyframe);
526 av_freep(&s->deflate_block);
527 flashsv_decode_end(avctx);
528
529 return 0;
530}
531
532AVCodec ff_flashsv2_decoder = {
533 .name = "flashsv2",
534 .type = AVMEDIA_TYPE_VIDEO,
36ef5369 535 .id = AV_CODEC_ID_FLASHSV2,
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536 .priv_data_size = sizeof(FlashSVContext),
537 .init = flashsv2_decode_init,
538 .close = flashsv2_decode_end,
539 .decode = flashsv_decode_frame,
540 .capabilities = CODEC_CAP_DR1,
716d413c 541 .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
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542 .long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video v2"),
543};
544#endif /* CONFIG_FLASHSV2_DECODER */