FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/asvdec.c
Date: 2022-01-18 10:05:52
Exec Total Coverage
Lines: 142 158 89.9%
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/thread.h"
29
30 #include "asv.h"
31 #include "avcodec.h"
32 #include "blockdsp.h"
33 #include "idctdsp.h"
34 #include "internal.h"
35 #include "mpeg12data.h"
36
37 #define CCP_VLC_BITS 5
38 #define DC_CCP_VLC_BITS 4
39 #define AC_CCP_VLC_BITS 6
40 #define ASV1_LEVEL_VLC_BITS 4
41 #define ASV2_LEVEL_VLC_BITS 10
42
43 static VLC ccp_vlc;
44 static VLC level_vlc;
45 static VLC dc_ccp_vlc;
46 static VLC ac_ccp_vlc;
47 static VLC asv2_level_vlc;
48
49 10 static av_cold void init_vlcs(void)
50 {
51 10 INIT_VLC_STATIC(&ccp_vlc, CCP_VLC_BITS, 17,
52 &ff_asv_ccp_tab[0][1], 2, 1,
53 &ff_asv_ccp_tab[0][0], 2, 1, 32);
54 10 INIT_LE_VLC_STATIC(&dc_ccp_vlc, DC_CCP_VLC_BITS, 8,
55 &ff_asv_dc_ccp_tab[0][1], 2, 1,
56 &ff_asv_dc_ccp_tab[0][0], 2, 1, 16);
57 10 INIT_LE_VLC_STATIC(&ac_ccp_vlc, AC_CCP_VLC_BITS, 16,
58 &ff_asv_ac_ccp_tab[0][1], 2, 1,
59 &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
60 10 INIT_VLC_STATIC(&level_vlc, ASV1_LEVEL_VLC_BITS, 7,
61 &ff_asv_level_tab[0][1], 2, 1,
62 &ff_asv_level_tab[0][0], 2, 1, 16);
63 10 INIT_LE_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
64 &ff_asv2_level_tab[0][1], 4, 2,
65 &ff_asv2_level_tab[0][0], 4, 2, 1024);
66 10 }
67
68 2972884 static inline int asv1_get_level(GetBitContext *gb)
69 {
70 2972884 int code = get_vlc2(gb, level_vlc.table, ASV1_LEVEL_VLC_BITS, 1);
71
72
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 2972884 if (code == 3)
73 429712 return get_sbits(gb, 8);
74 else
75 2543172 return code - 3;
76 }
77
78 // get_vlc2() is big-endian in this file
79 6010437 static inline int asv2_get_vlc2(GetBitContext *gb, VLC_TYPE (*table)[2], int bits)
80 {
81 unsigned int index;
82 int code, n;
83
84 6010437 OPEN_READER(re, gb);
85 6010437 UPDATE_CACHE_LE(re, gb);
86
87 6010437 index = SHOW_UBITS_LE(re, gb, bits);
88 6010437 code = table[index][0];
89 6010437 n = table[index][1];
90 6010437 LAST_SKIP_BITS(re, gb, n);
91
92 6010437 CLOSE_READER(re, gb);
93
94 6010437 return code;
95 }
96
97 3660409 static inline int asv2_get_level(GetBitContext *gb)
98 {
99 3660409 int code = asv2_get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS);
100
101
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 3660409 if (code == 31)
102 613 return (int8_t) get_bits_le(gb, 8);
103 else
104 3659796 return code - 31;
105 }
106
107 359100 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
108 {
109 int i;
110
111 359100 block[0] = 8 * get_bits(&a->gb, 8);
112
113
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 2128752 for (i = 0; i < 11; i++) {
114 2128752 const int ccp = get_vlc2(&a->gb, ccp_vlc.table, CCP_VLC_BITS, 1);
115
116
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 2128752 if (ccp) {
117
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 1723494 if (ccp == 16)
118 359100 break;
119
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 1364394 if (ccp < 0 || i >= 10) {
120 ✗ av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
121 ✗ return AVERROR_INVALIDDATA;
122 }
123
124
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 1364394 if (ccp & 8)
125 759471 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
126
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 1364394 if (ccp & 4)
127 828513 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
128
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 1364394 if (ccp & 2)
129 781213 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
130
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 1364394 if (ccp & 1)
131 603687 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
132 }
133 }
134
135 359100 return 0;
136 }
137
138 359100 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
139 {
140 int i, count, ccp;
141
142 359100 count = get_bits_le(&a->gb, 4);
143
144 359100 block[0] = 8 * get_bits_le(&a->gb, 8);
145
146 359100 ccp = asv2_get_vlc2(&a->gb, dc_ccp_vlc.table, DC_CCP_VLC_BITS);
147
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 359100 if (ccp) {
148
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 329075 if (ccp & 4)
149 281504 block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
150
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 329075 if (ccp & 2)
151 284503 block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
152
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 329075 if (ccp & 1)
153 226812 block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
154 }
155
156
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 2350028 for (i = 1; i < count + 1; i++) {
157 1990928 const int ccp = asv2_get_vlc2(&a->gb, ac_ccp_vlc.table, AC_CCP_VLC_BITS);
158
159
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 1990928 if (ccp) {
160
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 1368743 if (ccp & 8)
161 968959 block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
162
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 1368743 if (ccp & 4)
163 733048 block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
164
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 1368743 if (ccp & 2)
165 667011 block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
166
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 1368743 if (ccp & 1)
167 498572 block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
168 }
169 }
170
171 359100 return 0;
172 }
173
174 119700 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
175 {
176 int i, ret;
177
178 119700 a->bdsp.clear_blocks(block[0]);
179
180
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 119700 if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
181
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 418950 for (i = 0; i < 6; i++) {
182
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 359100 if ((ret = asv1_decode_block(a, block[i])) < 0)
183 ✗ return ret;
184 }
185 } else {
186
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187
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 359100 if ((ret = asv2_decode_block(a, block[i])) < 0)
188 ✗ return ret;
189 }
190 }
191 119700 return 0;
192 }
193
194 119700 static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
195 {
196 119700 int16_t(*block)[64] = a->block;
197 119700 int linesize = frame->linesize[0];
198
199 119700 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
200 119700 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
201 119700 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
202
203 119700 a->idsp.idct_put(dest_y, linesize, block[0]);
204 119700 a->idsp.idct_put(dest_y + 8, linesize, block[1]);
205 119700 a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
206 119700 a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
207
208
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 119700 if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) {
209 119700 a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
210 119700 a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
211 }
212 119700 }
213
214 400 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
215 AVPacket *avpkt)
216 {
217 400 ASV1Context *const a = avctx->priv_data;
218 400 const uint8_t *buf = avpkt->data;
219 400 int buf_size = avpkt->size;
220 400 AVFrame *const p = data;
221 int mb_x, mb_y, ret;
222
223
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 400 if (buf_size * 8LL < a->mb_height * a->mb_width * 13LL)
224 ✗ return AVERROR_INVALIDDATA;
225
226
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 400 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
227 ✗ return ret;
228 400 p->pict_type = AV_PICTURE_TYPE_I;
229 400 p->key_frame = 1;
230
231
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 400 if (avctx->codec_id == AV_CODEC_ID_ASV1) {
232 200 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
233 buf_size);
234
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 200 if (!a->bitstream_buffer)
235 ✗ return AVERROR(ENOMEM);
236
237 200 a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,
238 (const uint32_t *) buf, buf_size / 4);
239 200 ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size);
240 } else {
241 200 ret = init_get_bits8_le(&a->gb, buf, buf_size);
242 }
243
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 400 if (ret < 0)
244 ✗ return ret;
245
246
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247
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248
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 119200 if ((ret = decode_mb(a, a->block)) < 0)
249 ✗ return ret;
250
251 119200 idct_put(a, p, mb_x, mb_y);
252 }
253 }
254
255
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 400 if (a->mb_width2 != a->mb_width) {
256 100 mb_x = a->mb_width2;
257
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 300 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
258
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 200 if ((ret = decode_mb(a, a->block)) < 0)
259 ✗ return ret;
260
261 200 idct_put(a, p, mb_x, mb_y);
262 }
263 }
264
265
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 400 if (a->mb_height2 != a->mb_height) {
266 100 mb_y = a->mb_height2;
267
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 400 for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
268
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 300 if ((ret = decode_mb(a, a->block)) < 0)
269 ✗ return ret;
270
271 300 idct_put(a, p, mb_x, mb_y);
272 }
273 }
274
275 400 *got_frame = 1;
276
277 400 emms_c();
278
279 400 return (get_bits_count(&a->gb) + 31) / 32 * 4;
280 }
281
282 18 static av_cold int decode_init(AVCodecContext *avctx)
283 {
284 static AVOnce init_static_once = AV_ONCE_INIT;
285 18 ASV1Context *const a = avctx->priv_data;
286
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 18 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
287 int i;
288
289
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 18 if (avctx->extradata_size < 1) {
290 ✗ av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");
291 }
292
293 18 ff_asv_common_init(avctx);
294 18 ff_blockdsp_init(&a->bdsp, avctx);
295 18 ff_idctdsp_init(&a->idsp, avctx);
296 18 ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab);
297 18 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
298
299
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 18 if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {
300 ✗ av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
301 ✗ if (avctx->codec_id == AV_CODEC_ID_ASV1)
302 ✗ a->inv_qscale = 6;
303 else
304 ✗ a->inv_qscale = 10;
305 }
306
307
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 1170 for (i = 0; i < 64; i++) {
308 1152 int index = ff_asv_scantab[i];
309
310 1152 a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] /
311 1152 a->inv_qscale;
312 }
313
314 18 ff_thread_once(&init_static_once, init_vlcs);
315
316 18 return 0;
317 }
318
319 9 static av_cold int decode_end(AVCodecContext *avctx)
320 {
321 9 ASV1Context *const a = avctx->priv_data;
322
323 9 av_freep(&a->bitstream_buffer);
324 9 a->bitstream_buffer_size = 0;
325
326 9 return 0;
327 }
328
329 #if CONFIG_ASV1_DECODER
330 const AVCodec ff_asv1_decoder = {
331 .name = "asv1",
332 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
333 .type = AVMEDIA_TYPE_VIDEO,
334 .id = AV_CODEC_ID_ASV1,
335 .priv_data_size = sizeof(ASV1Context),
336 .init = decode_init,
337 .close = decode_end,
338 .decode = decode_frame,
339 .capabilities = AV_CODEC_CAP_DR1,
340 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
341 };
342 #endif
343
344 #if CONFIG_ASV2_DECODER
345 const AVCodec ff_asv2_decoder = {
346 .name = "asv2",
347 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
348 .type = AVMEDIA_TYPE_VIDEO,
349 .id = AV_CODEC_ID_ASV2,
350 .priv_data_size = sizeof(ASV1Context),
351 .init = decode_init,
352 .decode = decode_frame,
353 .capabilities = AV_CODEC_CAP_DR1,
354 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
355 };
356 #endif
357