FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/hqx.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 196 288 68.1%
Functions: 10 12 83.3%
Branches: 82 143 57.3%
Line Branch Exec Source
1 /*
2 * Canopus HQX decoder
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <inttypes.h>
22
23 #include "libavutil/imgutils.h"
24 #include "libavutil/intreadwrite.h"
25
26 #include "avcodec.h"
27 #include "canopus.h"
28 #include "codec_internal.h"
29 #include "get_bits.h"
30 #include "thread.h"
31
32 #include "hqx.h"
33 #include "hqxdsp.h"
34
35 /* HQX has four modes - 422, 444, 422alpha and 444alpha - all 12-bit */
36 enum HQXFormat {
37 HQX_422 = 0,
38 HQX_444,
39 HQX_422A,
40 HQX_444A,
41 };
42
43 #define HQX_HEADER_SIZE 59
44
45 /* macroblock selects a group of 4 possible quants and
46 * a block can use any of those four quantisers
47 * one column is powers of 2, the other one is powers of 2 * 3,
48 * then there is the special one, powers of 2 * 5 */
49 static const int hqx_quants[16][4] = {
50 { 0x1, 0x2, 0x4, 0x8 }, { 0x1, 0x3, 0x6, 0xC },
51 { 0x2, 0x4, 0x8, 0x10 }, { 0x3, 0x6, 0xC, 0x18 },
52 { 0x4, 0x8, 0x10, 0x20 }, { 0x6, 0xC, 0x18, 0x30 },
53 { 0x8, 0x10, 0x20, 0x40 },
54 { 0xA, 0x14, 0x28, 0x50 },
55 { 0xC, 0x18, 0x30, 0x60 },
56 { 0x10, 0x20, 0x40, 0x80 }, { 0x18, 0x30, 0x60, 0xC0 },
57 { 0x20, 0x40, 0x80, 0x100 }, { 0x30, 0x60, 0xC0, 0x180 },
58 { 0x40, 0x80, 0x100, 0x200 }, { 0x60, 0xC0, 0x180, 0x300 },
59 { 0x80, 0x100, 0x200, 0x400 }
60 };
61
62 static const uint8_t hqx_quant_luma[64] = {
63 16, 16, 16, 19, 19, 19, 42, 44,
64 16, 16, 19, 19, 19, 38, 43, 45,
65 16, 19, 19, 19, 40, 41, 45, 48,
66 19, 19, 19, 40, 41, 42, 46, 49,
67 19, 19, 40, 41, 42, 43, 48, 101,
68 19, 38, 41, 42, 43, 44, 98, 104,
69 42, 43, 45, 46, 48, 98, 109, 116,
70 44, 45, 48, 49, 101, 104, 116, 123,
71 };
72
73 static const uint8_t hqx_quant_chroma[64] = {
74 16, 16, 19, 25, 26, 26, 42, 44,
75 16, 19, 25, 25, 26, 38, 43, 91,
76 19, 25, 26, 27, 40, 41, 91, 96,
77 25, 25, 27, 40, 41, 84, 93, 197,
78 26, 26, 40, 41, 84, 86, 191, 203,
79 26, 38, 41, 84, 86, 177, 197, 209,
80 42, 43, 91, 93, 191, 197, 219, 232,
81 44, 91, 96, 197, 203, 209, 232, 246,
82 };
83
84 110880 static inline void put_blocks(HQXContext *ctx, int plane,
85 int x, int y, int ilace,
86 int16_t *block0, int16_t *block1,
87 const uint8_t *quant)
88 {
89
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 110880 int fields = ilace ? 2 : 1;
90 110880 int lsize = ctx->pic->linesize[plane];
91 110880 uint8_t *p = ctx->pic->data[plane] + x * 2;
92
93 110880 ctx->hqxdsp.idct_put((uint16_t *)(p + y * lsize),
94 110880 lsize * fields, block0, quant);
95 110880 ctx->hqxdsp.idct_put((uint16_t *)(p + (y + (ilace ? 1 : 8)) * lsize),
96
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 110880 lsize * fields, block1, quant);
97 110880 }
98
99 2674300 static inline void hqx_get_ac(GetBitContext *gb, const HQXAC *ac,
100 int *run, int *lev)
101 {
102 int val;
103
104 2674300 val = show_bits(gb, ac->lut_bits);
105
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 2674300 if (ac->lut[val].bits == -1) {
106 108610 GetBitContext gb2 = *gb;
107 108610 skip_bits(&gb2, ac->lut_bits);
108 108610 val = ac->lut[val].lev + show_bits(&gb2, ac->extra_bits);
109 }
110 2674300 *run = ac->lut[val].run;
111 2674300 *lev = ac->lut[val].lev;
112 2674300 skip_bits(gb, ac->lut[val].bits);
113 2674300 }
114
115 144104 static int decode_block(GetBitContext *gb, VLC *vlc,
116 const int *quants, int dcb,
117 int16_t block[64], int *last_dc)
118 {
119 int q, dc;
120 int ac_idx;
121 144104 int run, lev, pos = 1;
122
123 144104 memset(block, 0, 64 * sizeof(*block));
124 144104 dc = get_vlc2(gb, vlc->table, HQX_DC_VLC_BITS, 2);
125 144104 *last_dc += dc;
126
127 144104 block[0] = sign_extend(*last_dc << (12 - dcb), 12);
128
129 144104 q = quants[get_bits(gb, 2)];
130
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 144104 if (q >= 128)
131 ✗ ac_idx = HQX_AC_Q128;
132
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 144104 else if (q >= 64)
133 ✗ ac_idx = HQX_AC_Q64;
134
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 144104 else if (q >= 32)
135 ✗ ac_idx = HQX_AC_Q32;
136
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 144104 else if (q >= 16)
137 ✗ ac_idx = HQX_AC_Q16;
138
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 144104 else if (q >= 8)
139 14 ac_idx = HQX_AC_Q8;
140 else
141 144090 ac_idx = HQX_AC_Q0;
142
143 do {
144 2674300 hqx_get_ac(gb, &ff_hqx_ac[ac_idx], &run, &lev);
145 2674300 pos += run;
146
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 2674300 if (pos >= 64)
147 140780 break;
148 2533520 block[ff_zigzag_direct[pos++]] = lev * q;
149
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 2533520 } while (pos < 64);
150
151 144104 return 0;
152 }
153
154 3240 static int hqx_decode_422(HQXContext *ctx, int slice_no, int x, int y)
155 {
156 3240 HQXSlice *slice = &ctx->slice[slice_no];
157 3240 GetBitContext *gb = &slice->gb;
158 const int *quants;
159 int flag;
160 int last_dc;
161 int i, ret;
162
163
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 3240 if (ctx->interlaced)
164 3240 flag = get_bits1(gb);
165 else
166 ✗ flag = 0;
167
168 3240 quants = hqx_quants[get_bits(gb, 4)];
169
170
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 29160 for (i = 0; i < 8; i++) {
171 25920 int vlc_index = ctx->dcb - 9;
172
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 25920 if (i == 0 || i == 4 || i == 6)
173 9720 last_dc = 0;
174 25920 ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants,
175 25920 ctx->dcb, slice->block[i], &last_dc);
176
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 25920 if (ret < 0)
177 ✗ return ret;
178 }
179
180 3240 put_blocks(ctx, 0, x, y, flag, slice->block[0], slice->block[2], hqx_quant_luma);
181 3240 put_blocks(ctx, 0, x + 8, y, flag, slice->block[1], slice->block[3], hqx_quant_luma);
182 3240 put_blocks(ctx, 2, x >> 1, y, flag, slice->block[4], slice->block[5], hqx_quant_chroma);
183 3240 put_blocks(ctx, 1, x >> 1, y, flag, slice->block[6], slice->block[7], hqx_quant_chroma);
184
185 3240 return 0;
186 }
187
188 16320 static int hqx_decode_422a(HQXContext *ctx, int slice_no, int x, int y)
189 {
190 16320 HQXSlice *slice = &ctx->slice[slice_no];
191 16320 GetBitContext *gb = &slice->gb;
192 const int *quants;
193 16320 int flag = 0;
194 int last_dc;
195 int i, ret;
196 int cbp;
197
198 16320 cbp = get_vlc2(gb, ctx->cbp_vlc.table, HQX_CBP_VLC_BITS, 1);
199
200
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 212160 for (i = 0; i < 12; i++)
201 195840 memset(slice->block[i], 0, sizeof(**slice->block) * 64);
202
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 212160 for (i = 0; i < 12; i++)
203 195840 slice->block[i][0] = -0x800;
204
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 16320 if (cbp) {
205
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 9986 if (ctx->interlaced)
206 9986 flag = get_bits1(gb);
207
208 9986 quants = hqx_quants[get_bits(gb, 4)];
209
210 9986 cbp |= cbp << 4; // alpha CBP
211
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 9986 if (cbp & 0x3) // chroma CBP - top
212 9896 cbp |= 0x500;
213
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 9986 if (cbp & 0xC) // chroma CBP - bottom
214 9878 cbp |= 0xA00;
215
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 129818 for (i = 0; i < 12; i++) {
216
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 119832 if (i == 0 || i == 4 || i == 8 || i == 10)
217 39944 last_dc = 0;
218
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 119832 if (cbp & (1 << i)) {
219 118184 int vlc_index = ctx->dcb - 9;
220 118184 ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants,
221 118184 ctx->dcb, slice->block[i], &last_dc);
222
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 118184 if (ret < 0)
223 ✗ return ret;
224 }
225 }
226 }
227
228 16320 put_blocks(ctx, 3, x, y, flag, slice->block[ 0], slice->block[ 2], hqx_quant_luma);
229 16320 put_blocks(ctx, 3, x + 8, y, flag, slice->block[ 1], slice->block[ 3], hqx_quant_luma);
230 16320 put_blocks(ctx, 0, x, y, flag, slice->block[ 4], slice->block[ 6], hqx_quant_luma);
231 16320 put_blocks(ctx, 0, x + 8, y, flag, slice->block[ 5], slice->block[ 7], hqx_quant_luma);
232 16320 put_blocks(ctx, 2, x >> 1, y, flag, slice->block[ 8], slice->block[ 9], hqx_quant_chroma);
233 16320 put_blocks(ctx, 1, x >> 1, y, flag, slice->block[10], slice->block[11], hqx_quant_chroma);
234
235 16320 return 0;
236 }
237
238 ✗ static int hqx_decode_444(HQXContext *ctx, int slice_no, int x, int y)
239 {
240 ✗ HQXSlice *slice = &ctx->slice[slice_no];
241 ✗ GetBitContext *gb = &slice->gb;
242 const int *quants;
243 int flag;
244 int last_dc;
245 int i, ret;
246
247 ✗ if (ctx->interlaced)
248 ✗ flag = get_bits1(gb);
249 else
250 ✗ flag = 0;
251
252 ✗ quants = hqx_quants[get_bits(gb, 4)];
253
254 ✗ for (i = 0; i < 12; i++) {
255 ✗ int vlc_index = ctx->dcb - 9;
256 ✗ if (i == 0 || i == 4 || i == 8)
257 ✗ last_dc = 0;
258 ✗ ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants,
259 ✗ ctx->dcb, slice->block[i], &last_dc);
260 ✗ if (ret < 0)
261 ✗ return ret;
262 }
263
264 ✗ put_blocks(ctx, 0, x, y, flag, slice->block[0], slice->block[ 2], hqx_quant_luma);
265 ✗ put_blocks(ctx, 0, x + 8, y, flag, slice->block[1], slice->block[ 3], hqx_quant_luma);
266 ✗ put_blocks(ctx, 2, x, y, flag, slice->block[4], slice->block[ 6], hqx_quant_chroma);
267 ✗ put_blocks(ctx, 2, x + 8, y, flag, slice->block[5], slice->block[ 7], hqx_quant_chroma);
268 ✗ put_blocks(ctx, 1, x, y, flag, slice->block[8], slice->block[10], hqx_quant_chroma);
269 ✗ put_blocks(ctx, 1, x + 8, y, flag, slice->block[9], slice->block[11], hqx_quant_chroma);
270
271 ✗ return 0;
272 }
273
274 ✗ static int hqx_decode_444a(HQXContext *ctx, int slice_no, int x, int y)
275 {
276 ✗ HQXSlice *slice = &ctx->slice[slice_no];
277 ✗ GetBitContext *gb = &slice->gb;
278 const int *quants;
279 ✗ int flag = 0;
280 int last_dc;
281 int i, ret;
282 int cbp;
283
284 ✗ cbp = get_vlc2(gb, ctx->cbp_vlc.table, HQX_CBP_VLC_BITS, 1);
285
286 ✗ for (i = 0; i < 16; i++)
287 ✗ memset(slice->block[i], 0, sizeof(**slice->block) * 64);
288 ✗ for (i = 0; i < 16; i++)
289 ✗ slice->block[i][0] = -0x800;
290 ✗ if (cbp) {
291 ✗ if (ctx->interlaced)
292 ✗ flag = get_bits1(gb);
293
294 ✗ quants = hqx_quants[get_bits(gb, 4)];
295
296 ✗ cbp |= cbp << 4; // alpha CBP
297 ✗ cbp |= cbp << 8; // chroma CBP
298 ✗ for (i = 0; i < 16; i++) {
299 ✗ if (i == 0 || i == 4 || i == 8 || i == 12)
300 ✗ last_dc = 0;
301 ✗ if (cbp & (1 << i)) {
302 ✗ int vlc_index = ctx->dcb - 9;
303 ✗ ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants,
304 ✗ ctx->dcb, slice->block[i], &last_dc);
305 ✗ if (ret < 0)
306 ✗ return ret;
307 }
308 }
309 }
310
311 ✗ put_blocks(ctx, 3, x, y, flag, slice->block[ 0], slice->block[ 2], hqx_quant_luma);
312 ✗ put_blocks(ctx, 3, x + 8, y, flag, slice->block[ 1], slice->block[ 3], hqx_quant_luma);
313 ✗ put_blocks(ctx, 0, x, y, flag, slice->block[ 4], slice->block[ 6], hqx_quant_luma);
314 ✗ put_blocks(ctx, 0, x + 8, y, flag, slice->block[ 5], slice->block[ 7], hqx_quant_luma);
315 ✗ put_blocks(ctx, 2, x, y, flag, slice->block[ 8], slice->block[10], hqx_quant_chroma);
316 ✗ put_blocks(ctx, 2, x + 8, y, flag, slice->block[ 9], slice->block[11], hqx_quant_chroma);
317 ✗ put_blocks(ctx, 1, x, y, flag, slice->block[12], slice->block[14], hqx_quant_chroma);
318 ✗ put_blocks(ctx, 1, x + 8, y, flag, slice->block[13], slice->block[15], hqx_quant_chroma);
319
320 ✗ return 0;
321 }
322
323 static const int shuffle_16[16] = {
324 0, 5, 11, 14, 2, 7, 9, 13, 1, 4, 10, 15, 3, 6, 8, 12
325 };
326
327 64 static int decode_slice(HQXContext *ctx, int slice_no)
328 {
329 64 int mb_w = (ctx->width + 15) >> 4;
330 64 int mb_h = (ctx->height + 15) >> 4;
331 64 int grp_w = (mb_w + 4) / 5;
332 64 int grp_h = (mb_h + 4) / 5;
333 64 int grp_h_edge = grp_w * (mb_w / grp_w);
334 64 int grp_v_edge = grp_h * (mb_h / grp_h);
335 64 int grp_v_rest = mb_w - grp_h_edge;
336 64 int grp_h_rest = mb_h - grp_v_edge;
337 64 int num_mbs = mb_w * mb_h;
338 64 int num_tiles = (num_mbs + 479) / 480;
339 64 int std_tile_blocks = num_mbs / (16 * num_tiles);
340 64 int g_tile = slice_no * num_tiles;
341 int blk_addr, loc_addr, mb_x, mb_y, pos, loc_row, i;
342 int tile_blocks, tile_limit, tile_no;
343
344
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 736 for (tile_no = 0; tile_no < num_tiles; tile_no++, g_tile++) {
345 672 tile_blocks = std_tile_blocks;
346 672 tile_limit = -1;
347
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 672 if (g_tile < num_mbs - std_tile_blocks * 16 * num_tiles) {
348 40 tile_limit = num_mbs / (16 * num_tiles);
349 40 tile_blocks++;
350 }
351
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 20232 for (i = 0; i < tile_blocks; i++) {
352
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 19560 if (i == tile_limit)
353 40 blk_addr = g_tile + 16 * num_tiles * i;
354 else
355 19520 blk_addr = tile_no + 16 * num_tiles * i +
356 19520 num_tiles * shuffle_16[(i + slice_no) & 0xF];
357 19560 loc_row = grp_h * (blk_addr / (grp_h * mb_w));
358 19560 loc_addr = blk_addr % (grp_h * mb_w);
359
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 19560 if (loc_row >= grp_v_edge) {
360 3240 mb_x = grp_w * (loc_addr / (grp_h_rest * grp_w));
361 3240 pos = loc_addr % (grp_h_rest * grp_w);
362 } else {
363 16320 mb_x = grp_w * (loc_addr / (grp_h * grp_w));
364 16320 pos = loc_addr % (grp_h * grp_w);
365 }
366
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 19560 if (mb_x >= grp_h_edge) {
367 ✗ mb_x += pos % grp_v_rest;
368 ✗ mb_y = loc_row + (pos / grp_v_rest);
369 } else {
370 19560 mb_x += pos % grp_w;
371 19560 mb_y = loc_row + (pos / grp_w);
372 }
373 19560 ctx->decode_func(ctx, slice_no, mb_x * 16, mb_y * 16);
374 }
375 }
376
377 64 return 0;
378 }
379
380 64 static int decode_slice_thread(AVCodecContext *avctx, void *arg,
381 int slice_no, int threadnr)
382 {
383 64 HQXContext *ctx = avctx->priv_data;
384 64 uint32_t *slice_off = ctx->slice_off;
385 int ret;
386
387
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 64 if (slice_off[slice_no] < HQX_HEADER_SIZE ||
388
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 64 slice_off[slice_no] >= slice_off[slice_no + 1] ||
389
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 64 slice_off[slice_no + 1] > ctx->data_size) {
390 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid slice size %d.\n", ctx->data_size);
391 ✗ return AVERROR_INVALIDDATA;
392 }
393
394 64 ret = init_get_bits8(&ctx->slice[slice_no].gb,
395 64 ctx->src + slice_off[slice_no],
396 64 slice_off[slice_no + 1] - slice_off[slice_no]);
397
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 64 if (ret < 0)
398 ✗ return ret;
399
400 64 return decode_slice(ctx, slice_no);
401 }
402
403 4 static int hqx_decode_frame(AVCodecContext *avctx, AVFrame *frame,
404 int *got_picture_ptr, AVPacket *avpkt)
405 {
406 4 HQXContext *ctx = avctx->priv_data;
407 4 const uint8_t *src = avpkt->data;
408 uint32_t info_tag;
409 int data_start;
410 int i, ret;
411
412
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 4 if (avpkt->size < 4 + 4) {
413 ✗ av_log(avctx, AV_LOG_ERROR, "Frame is too small %d.\n", avpkt->size);
414 ✗ return AVERROR_INVALIDDATA;
415 }
416
417 4 info_tag = AV_RL32(src);
418
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 4 if (info_tag == MKTAG('I', 'N', 'F', 'O')) {
419 4 uint32_t info_offset = AV_RL32(src + 4);
420
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 4 if (info_offset > INT_MAX || info_offset + 8 > avpkt->size) {
421 ✗ av_log(avctx, AV_LOG_ERROR,
422 "Invalid INFO header offset: 0x%08"PRIX32" is too large.\n",
423 info_offset);
424 ✗ return AVERROR_INVALIDDATA;
425 }
426 4 ff_canopus_parse_info_tag(avctx, src + 8, info_offset);
427
428 4 info_offset += 8;
429 4 src += info_offset;
430 }
431
432 4 data_start = src - avpkt->data;
433 4 ctx->data_size = avpkt->size - data_start;
434 4 ctx->src = src;
435 4 ctx->pic = frame;
436
437
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 4 if (ctx->data_size < HQX_HEADER_SIZE) {
438 ✗ av_log(avctx, AV_LOG_ERROR, "Frame too small.\n");
439 ✗ return AVERROR_INVALIDDATA;
440 }
441
442
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 4 if (src[0] != 'H' || src[1] != 'Q') {
443 ✗ av_log(avctx, AV_LOG_ERROR, "Not an HQX frame.\n");
444 ✗ return AVERROR_INVALIDDATA;
445 }
446 4 ctx->interlaced = !(src[2] & 0x80);
447 4 ctx->format = src[2] & 7;
448 4 ctx->dcb = (src[3] & 3) + 8;
449 4 ctx->width = AV_RB16(src + 4);
450 4 ctx->height = AV_RB16(src + 6);
451
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 72 for (i = 0; i < 17; i++)
452 68 ctx->slice_off[i] = AV_RB24(src + 8 + i * 3);
453
454
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 4 if (ctx->dcb == 8) {
455 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid DC precision %d.\n", ctx->dcb);
456 ✗ return AVERROR_INVALIDDATA;
457 }
458 4 ret = av_image_check_size(ctx->width, ctx->height, 0, avctx);
459
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 4 if (ret < 0) {
460 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid stored dimensions %dx%d.\n",
461 ctx->width, ctx->height);
462 ✗ return AVERROR_INVALIDDATA;
463 }
464
465 4 avctx->coded_width = FFALIGN(ctx->width, 16);
466 4 avctx->coded_height = FFALIGN(ctx->height, 16);
467 4 avctx->width = ctx->width;
468 4 avctx->height = ctx->height;
469 4 avctx->bits_per_raw_sample = 10;
470
471 //The minimum size is 2bit per macroblock
472 // hqx_decode_422 & hqx_decode_444 have a unconditionally stored 4bits hqx_quants index
473 // hqx_decode_422a & hqx_decode_444a use cbp_vlc which has a minimum length of 2 bits for its VLCs
474 // The code rejects slices overlapping in their input data
475 4 if (avctx->coded_width / 16 * (avctx->coded_height / 16) *
476
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 4 (100 - avctx->discard_damaged_percentage) / 100 > 4LL * avpkt->size)
477 ✗ return AVERROR_INVALIDDATA;
478
479
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 4 switch (ctx->format) {
480 2 case HQX_422:
481 2 avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
482 2 ctx->decode_func = hqx_decode_422;
483 2 break;
484 ✗ case HQX_444:
485 ✗ avctx->pix_fmt = AV_PIX_FMT_YUV444P16;
486 ✗ ctx->decode_func = hqx_decode_444;
487 ✗ break;
488 2 case HQX_422A:
489 2 avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;
490 2 ctx->decode_func = hqx_decode_422a;
491 2 break;
492 ✗ case HQX_444A:
493 ✗ avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;
494 ✗ ctx->decode_func = hqx_decode_444a;
495 ✗ break;
496 ✗ default:
497 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid format: %d.\n", ctx->format);
498 ✗ return AVERROR_INVALIDDATA;
499 }
500
501 4 ret = ff_thread_get_buffer(avctx, frame, 0);
502
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 4 if (ret < 0)
503 ✗ return ret;
504
505 4 avctx->execute2(avctx, decode_slice_thread, NULL, NULL, 16);
506
507 4 *got_picture_ptr = 1;
508
509 4 return avpkt->size;
510 }
511
512 4 static av_cold int hqx_decode_close(AVCodecContext *avctx)
513 {
514 int i;
515 4 HQXContext *ctx = avctx->priv_data;
516
517 4 ff_vlc_free(&ctx->cbp_vlc);
518
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 16 for (i = 0; i < 3; i++) {
519 12 ff_vlc_free(&ctx->dc_vlc[i]);
520 }
521
522 4 return 0;
523 }
524
525 4 static av_cold int hqx_decode_init(AVCodecContext *avctx)
526 {
527 4 HQXContext *ctx = avctx->priv_data;
528
529 4 ff_hqxdsp_init(&ctx->hqxdsp);
530
531 4 return ff_hqx_init_vlcs(ctx);
532 }
533
534 const FFCodec ff_hqx_decoder = {
535 .p.name = "hqx",
536 CODEC_LONG_NAME("Canopus HQX"),
537 .p.type = AVMEDIA_TYPE_VIDEO,
538 .p.id = AV_CODEC_ID_HQX,
539 .priv_data_size = sizeof(HQXContext),
540 .init = hqx_decode_init,
541 FF_CODEC_DECODE_CB(hqx_decode_frame),
542 .close = hqx_decode_close,
543 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS |
544 AV_CODEC_CAP_FRAME_THREADS,
545 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
546 };
547