FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/asvdec.c
Date: 2025-07-28 20:30:09
Exec Total Coverage
Lines: 139 155 89.7%
Functions: 11 11 100.0%
Branches: 76 94 80.9%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2003 Michael Niedermayer
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 /**
22 * @file
23 * ASUS V1/V2 decoder.
24 */
25
26 #include "libavutil/attributes.h"
27 #include "libavutil/mem.h"
28 #include "libavutil/mem_internal.h"
29 #include "libavutil/thread.h"
30
31 #include "asv.h"
32 #include "avcodec.h"
33 #include "blockdsp.h"
34 #include "codec_internal.h"
35 #include "config_components.h"
36 #include "decode.h"
37 #include "get_bits.h"
38 #include "idctdsp.h"
39 #include "mpeg12data.h"
40 #include "vlc.h"
41
42 #define CCP_VLC_BITS 5
43 #define DC_CCP_VLC_BITS 4
44 #define AC_CCP_VLC_BITS 6
45 #define ASV1_LEVEL_VLC_BITS 4
46 #define ASV2_LEVEL_VLC_BITS 10
47
48 static VLCElem ccp_vlc[32];
49 static VLCElem level_vlc[16];
50 static VLCElem dc_ccp_vlc[16];
51 static VLCElem ac_ccp_vlc[64];
52 static VLCElem asv2_level_vlc[1024];
53
54 typedef struct ASVDecContext {
55 ASVCommonContext c;
56
57 GetBitContext gb;
58
59 BlockDSPContext bdsp;
60 IDCTDSPContext idsp;
61 uint8_t permutated_scantable[64];
62 DECLARE_ALIGNED(32, int16_t, block)[6][64];
63 uint16_t intra_matrix[64];
64 uint8_t *bitstream_buffer;
65 unsigned int bitstream_buffer_size;
66 } ASVDecContext;
67
68 10 static av_cold void init_vlcs(void)
69 {
70 10 VLC_INIT_STATIC_TABLE(ccp_vlc, CCP_VLC_BITS, 17,
71 &ff_asv_ccp_tab[0][1], 2, 1,
72 &ff_asv_ccp_tab[0][0], 2, 1, 0);
73 10 VLC_INIT_STATIC_TABLE(dc_ccp_vlc, DC_CCP_VLC_BITS, 8,
74 &ff_asv_dc_ccp_tab[0][1], 2, 1,
75 &ff_asv_dc_ccp_tab[0][0], 2, 1, VLC_INIT_LE);
76 10 VLC_INIT_STATIC_TABLE(ac_ccp_vlc, AC_CCP_VLC_BITS, 16,
77 &ff_asv_ac_ccp_tab[0][1], 2, 1,
78 &ff_asv_ac_ccp_tab[0][0], 2, 1, VLC_INIT_LE);
79 10 VLC_INIT_STATIC_TABLE(level_vlc, ASV1_LEVEL_VLC_BITS, 7,
80 &ff_asv_level_tab[0][1], 2, 1,
81 &ff_asv_level_tab[0][0], 2, 1, 0);
82 10 VLC_INIT_STATIC_TABLE(asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
83 &ff_asv2_level_tab[0][1], 4, 2,
84 &ff_asv2_level_tab[0][0], 4, 2, VLC_INIT_LE);
85 10 }
86
87 2970458 static inline int asv1_get_level(GetBitContext *gb)
88 {
89 2970458 int code = get_vlc2(gb, level_vlc, ASV1_LEVEL_VLC_BITS, 1);
90
91
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 2970458 if (code == 3)
92 428811 return get_sbits(gb, 8);
93 else
94 2541647 return code - 3;
95 }
96
97 // get_vlc2() is big-endian in this file
98 6005036 static inline int asv2_get_vlc2(GetBitContext *gb, const VLCElem *table, int bits)
99 {
100 unsigned int index;
101 int code, n;
102
103 6005036 OPEN_READER(re, gb);
104 6005036 UPDATE_CACHE_LE(re, gb);
105
106 6005036 index = SHOW_UBITS_LE(re, gb, bits);
107 6005036 code = table[index].sym;
108 6005036 n = table[index].len;
109 6005036 LAST_SKIP_BITS(re, gb, n);
110
111 6005036 CLOSE_READER(re, gb);
112
113 6005036 return code;
114 }
115
116 3657862 static inline int asv2_get_level(GetBitContext *gb)
117 {
118 3657862 int code = asv2_get_vlc2(gb, asv2_level_vlc, ASV2_LEVEL_VLC_BITS);
119
120
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 3657862 if (code == 31)
121 613 return (int8_t) get_bits_le(gb, 8);
122 else
123 3657249 return code - 31;
124 }
125
126 359100 static inline int asv1_decode_block(ASVDecContext *a, int16_t block[64])
127 {
128 int i;
129
130 359100 block[0] = 8 * get_bits(&a->gb, 8);
131
132
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 2125515 for (i = 0; i < 11; i++) {
133 2125515 const int ccp = get_vlc2(&a->gb, ccp_vlc, CCP_VLC_BITS, 1);
134
135
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 2125515 if (ccp) {
136
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 1721901 if (ccp == 16)
137 359100 break;
138
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 1362801 if (ccp < 0 || i >= 10) {
139 ✗ av_log(a->c.avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
140 ✗ return AVERROR_INVALIDDATA;
141 }
142
143
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 1362801 if (ccp & 8)
144 758490 block[a->permutated_scantable[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
145
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 1362801 if (ccp & 4)
146 827835 block[a->permutated_scantable[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
147
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 1362801 if (ccp & 2)
148 780446 block[a->permutated_scantable[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
149
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 1362801 if (ccp & 1)
150 603687 block[a->permutated_scantable[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
151 }
152 }
153
154 359100 return 0;
155 }
156
157 359100 static inline int asv2_decode_block(ASVDecContext *a, int16_t block[64])
158 {
159 int i, count, ccp;
160
161 359100 count = get_bits_le(&a->gb, 4);
162
163 359100 block[0] = 8 * get_bits_le(&a->gb, 8);
164
165 359100 ccp = asv2_get_vlc2(&a->gb, dc_ccp_vlc, DC_CCP_VLC_BITS);
166
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 359100 if (ccp) {
167
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 328605 if (ccp & 4)
168 281268 block[a->permutated_scantable[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
169
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 328605 if (ccp & 2)
170 284269 block[a->permutated_scantable[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
171
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 328605 if (ccp & 1)
172 226812 block[a->permutated_scantable[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
173 }
174
175
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 2347174 for (i = 1; i < count + 1; i++) {
176 1988074 const int ccp = asv2_get_vlc2(&a->gb, ac_ccp_vlc, AC_CCP_VLC_BITS);
177
178
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 1988074 if (ccp) {
179
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 1367549 if (ccp & 8)
180 967939 block[a->permutated_scantable[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
181
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 1367549 if (ccp & 4)
182 732551 block[a->permutated_scantable[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
183
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 1367549 if (ccp & 2)
184 666451 block[a->permutated_scantable[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
185
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 1367549 if (ccp & 1)
186 498572 block[a->permutated_scantable[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
187 }
188 }
189
190 359100 return 0;
191 }
192
193 119700 static inline int decode_mb(ASVDecContext *a, int16_t block[6][64])
194 {
195 int i, ret;
196
197 119700 a->bdsp.clear_blocks(block[0]);
198
199
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 119700 if (a->c.avctx->codec_id == AV_CODEC_ID_ASV1) {
200
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201
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 359100 if ((ret = asv1_decode_block(a, block[i])) < 0)
202 ✗ return ret;
203 }
204 } else {
205
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206
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 359100 if ((ret = asv2_decode_block(a, block[i])) < 0)
207 ✗ return ret;
208 }
209 }
210 119700 return 0;
211 }
212
213 119700 static inline void idct_put(ASVDecContext *a, AVFrame *frame, int mb_x, int mb_y)
214 {
215 119700 int16_t(*block)[64] = a->block;
216 119700 int linesize = frame->linesize[0];
217
218 119700 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
219 119700 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
220 119700 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
221
222 119700 a->idsp.idct_put(dest_y, linesize, block[0]);
223 119700 a->idsp.idct_put(dest_y + 8, linesize, block[1]);
224 119700 a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
225 119700 a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
226
227
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 119700 if (!(a->c.avctx->flags & AV_CODEC_FLAG_GRAY)) {
228 119700 a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
229 119700 a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
230 }
231 119700 }
232
233 400 static int decode_frame(AVCodecContext *avctx, AVFrame *p,
234 int *got_frame, AVPacket *avpkt)
235 {
236 400 ASVDecContext *const a = avctx->priv_data;
237 400 const ASVCommonContext *const c = &a->c;
238 400 const uint8_t *buf = avpkt->data;
239 400 int buf_size = avpkt->size;
240 int ret;
241
242
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 400 if (buf_size * 8LL < c->mb_height * c->mb_width * 13LL)
243 ✗ return AVERROR_INVALIDDATA;
244
245
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 400 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
246 ✗ return ret;
247
248
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 400 if (avctx->codec_id == AV_CODEC_ID_ASV1) {
249 200 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
250 buf_size);
251
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 200 if (!a->bitstream_buffer)
252 ✗ return AVERROR(ENOMEM);
253
254 200 c->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,
255 (const uint32_t *) buf, buf_size / 4);
256 200 ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size);
257 } else {
258 200 ret = init_get_bits8_le(&a->gb, buf, buf_size);
259 }
260
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 400 if (ret < 0)
261 ✗ return ret;
262
263
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 6000 for (int mb_y = 0; mb_y < c->mb_height2; mb_y++) {
264
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265
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 119200 if ((ret = decode_mb(a, a->block)) < 0)
266 ✗ return ret;
267
268 119200 idct_put(a, p, mb_x, mb_y);
269 }
270 }
271
272
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 400 if (c->mb_width2 != c->mb_width) {
273 100 int mb_x = c->mb_width2;
274
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 300 for (int mb_y = 0; mb_y < c->mb_height2; mb_y++) {
275
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 200 if ((ret = decode_mb(a, a->block)) < 0)
276 ✗ return ret;
277
278 200 idct_put(a, p, mb_x, mb_y);
279 }
280 }
281
282
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 400 if (c->mb_height2 != c->mb_height) {
283 100 int mb_y = c->mb_height2;
284
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 400 for (int mb_x = 0; mb_x < c->mb_width; mb_x++) {
285
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 300 if ((ret = decode_mb(a, a->block)) < 0)
286 ✗ return ret;
287
288 300 idct_put(a, p, mb_x, mb_y);
289 }
290 }
291
292 400 *got_frame = 1;
293
294 400 return (get_bits_count(&a->gb) + 31) / 32 * 4;
295 }
296
297 18 static av_cold int decode_init(AVCodecContext *avctx)
298 {
299 static AVOnce init_static_once = AV_ONCE_INIT;
300 18 ASVDecContext *const a = avctx->priv_data;
301
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 18 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
302 int inv_qscale;
303 int i;
304
305
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 18 if (avctx->extradata_size < 1) {
306 ✗ av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");
307 }
308
309 18 ff_asv_common_init(avctx);
310 18 ff_blockdsp_init(&a->bdsp);
311 18 ff_idctdsp_init(&a->idsp, avctx);
312 18 ff_permute_scantable(a->permutated_scantable, ff_asv_scantab,
313 18 a->idsp.idct_permutation);
314 18 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
315
316
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 18 if (avctx->extradata_size < 1 || (inv_qscale = avctx->extradata[0]) == 0) {
317 ✗ av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
318 ✗ if (avctx->codec_id == AV_CODEC_ID_ASV1)
319 ✗ inv_qscale = 6;
320 else
321 ✗ inv_qscale = 10;
322 }
323
324
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 1170 for (i = 0; i < 64; i++) {
325 1152 int index = ff_asv_scantab[i];
326
327 1152 a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] /
328 inv_qscale;
329 }
330
331 18 ff_thread_once(&init_static_once, init_vlcs);
332
333 18 return 0;
334 }
335
336 9 static av_cold int decode_end(AVCodecContext *avctx)
337 {
338 9 ASVDecContext *const a = avctx->priv_data;
339
340 9 av_freep(&a->bitstream_buffer);
341 9 a->bitstream_buffer_size = 0;
342
343 9 return 0;
344 }
345
346 #if CONFIG_ASV1_DECODER
347 const FFCodec ff_asv1_decoder = {
348 .p.name = "asv1",
349 CODEC_LONG_NAME("ASUS V1"),
350 .p.type = AVMEDIA_TYPE_VIDEO,
351 .p.id = AV_CODEC_ID_ASV1,
352 .priv_data_size = sizeof(ASVDecContext),
353 .init = decode_init,
354 .close = decode_end,
355 FF_CODEC_DECODE_CB(decode_frame),
356 .p.capabilities = AV_CODEC_CAP_DR1,
357 };
358 #endif
359
360 #if CONFIG_ASV2_DECODER
361 const FFCodec ff_asv2_decoder = {
362 .p.name = "asv2",
363 CODEC_LONG_NAME("ASUS V2"),
364 .p.type = AVMEDIA_TYPE_VIDEO,
365 .p.id = AV_CODEC_ID_ASV2,
366 .priv_data_size = sizeof(ASVDecContext),
367 .init = decode_init,
368 FF_CODEC_DECODE_CB(decode_frame),
369 .p.capabilities = AV_CODEC_CAP_DR1,
370 };
371 #endif
372