FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/asvdec.c
Date: 2022-07-07 01:21:54
Exec Total Coverage
Lines: 141 157 89.8%
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 "codec_internal.h"
34 #include "config_components.h"
35 #include "idctdsp.h"
36 #include "internal.h"
37 #include "mpeg12data.h"
38
39 #define CCP_VLC_BITS 5
40 #define DC_CCP_VLC_BITS 4
41 #define AC_CCP_VLC_BITS 6
42 #define ASV1_LEVEL_VLC_BITS 4
43 #define ASV2_LEVEL_VLC_BITS 10
44
45 static VLC ccp_vlc;
46 static VLC level_vlc;
47 static VLC dc_ccp_vlc;
48 static VLC ac_ccp_vlc;
49 static VLC asv2_level_vlc;
50
51 10 static av_cold void init_vlcs(void)
52 {
53 10 INIT_VLC_STATIC(&ccp_vlc, CCP_VLC_BITS, 17,
54 &ff_asv_ccp_tab[0][1], 2, 1,
55 &ff_asv_ccp_tab[0][0], 2, 1, 32);
56 10 INIT_LE_VLC_STATIC(&dc_ccp_vlc, DC_CCP_VLC_BITS, 8,
57 &ff_asv_dc_ccp_tab[0][1], 2, 1,
58 &ff_asv_dc_ccp_tab[0][0], 2, 1, 16);
59 10 INIT_LE_VLC_STATIC(&ac_ccp_vlc, AC_CCP_VLC_BITS, 16,
60 &ff_asv_ac_ccp_tab[0][1], 2, 1,
61 &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
62 10 INIT_VLC_STATIC(&level_vlc, ASV1_LEVEL_VLC_BITS, 7,
63 &ff_asv_level_tab[0][1], 2, 1,
64 &ff_asv_level_tab[0][0], 2, 1, 16);
65 10 INIT_LE_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
66 &ff_asv2_level_tab[0][1], 4, 2,
67 &ff_asv2_level_tab[0][0], 4, 2, 1024);
68 10 }
69
70 2972884 static inline int asv1_get_level(GetBitContext *gb)
71 {
72 2972884 int code = get_vlc2(gb, level_vlc.table, ASV1_LEVEL_VLC_BITS, 1);
73
74
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2972884 if (code == 3)
75 429712 return get_sbits(gb, 8);
76 else
77 2543172 return code - 3;
78 }
79
80 // get_vlc2() is big-endian in this file
81 6010437 static inline int asv2_get_vlc2(GetBitContext *gb, const VLCElem *table, int bits)
82 {
83 unsigned int index;
84 int code, n;
85
86 6010437 OPEN_READER(re, gb);
87 6010437 UPDATE_CACHE_LE(re, gb);
88
89 6010437 index = SHOW_UBITS_LE(re, gb, bits);
90 6010437 code = table[index].sym;
91 6010437 n = table[index].len;
92 6010437 LAST_SKIP_BITS(re, gb, n);
93
94 6010437 CLOSE_READER(re, gb);
95
96 6010437 return code;
97 }
98
99 3660409 static inline int asv2_get_level(GetBitContext *gb)
100 {
101 3660409 int code = asv2_get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS);
102
103
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3660409 if (code == 31)
104 613 return (int8_t) get_bits_le(gb, 8);
105 else
106 3659796 return code - 31;
107 }
108
109 359100 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
110 {
111 int i;
112
113 359100 block[0] = 8 * get_bits(&a->gb, 8);
114
115
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2128752 for (i = 0; i < 11; i++) {
116 2128752 const int ccp = get_vlc2(&a->gb, ccp_vlc.table, CCP_VLC_BITS, 1);
117
118
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2128752 if (ccp) {
119
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1723494 if (ccp == 16)
120 359100 break;
121
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1364394 if (ccp < 0 || i >= 10) {
122 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
123 return AVERROR_INVALIDDATA;
124 }
125
126
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1364394 if (ccp & 8)
127 759471 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
128
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1364394 if (ccp & 4)
129 828513 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
130
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1364394 if (ccp & 2)
131 781213 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
132
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1364394 if (ccp & 1)
133 603687 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
134 }
135 }
136
137 359100 return 0;
138 }
139
140 359100 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
141 {
142 int i, count, ccp;
143
144 359100 count = get_bits_le(&a->gb, 4);
145
146 359100 block[0] = 8 * get_bits_le(&a->gb, 8);
147
148 359100 ccp = asv2_get_vlc2(&a->gb, dc_ccp_vlc.table, DC_CCP_VLC_BITS);
149
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359100 if (ccp) {
150
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329075 if (ccp & 4)
151 281504 block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
152
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329075 if (ccp & 2)
153 284503 block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
154
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329075 if (ccp & 1)
155 226812 block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
156 }
157
158
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2350028 for (i = 1; i < count + 1; i++) {
159 1990928 const int ccp = asv2_get_vlc2(&a->gb, ac_ccp_vlc.table, AC_CCP_VLC_BITS);
160
161
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1990928 if (ccp) {
162
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1368743 if (ccp & 8)
163 968959 block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
164
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1368743 if (ccp & 4)
165 733048 block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
166
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1368743 if (ccp & 2)
167 667011 block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
168
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1368743 if (ccp & 1)
169 498572 block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
170 }
171 }
172
173 359100 return 0;
174 }
175
176 119700 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
177 {
178 int i, ret;
179
180 119700 a->bdsp.clear_blocks(block[0]);
181
182
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119700 if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
183
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418950 for (i = 0; i < 6; i++) {
184
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359100 if ((ret = asv1_decode_block(a, block[i])) < 0)
185 return ret;
186 }
187 } else {
188
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189
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359100 if ((ret = asv2_decode_block(a, block[i])) < 0)
190 return ret;
191 }
192 }
193 119700 return 0;
194 }
195
196 119700 static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
197 {
198 119700 int16_t(*block)[64] = a->block;
199 119700 int linesize = frame->linesize[0];
200
201 119700 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
202 119700 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
203 119700 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
204
205 119700 a->idsp.idct_put(dest_y, linesize, block[0]);
206 119700 a->idsp.idct_put(dest_y + 8, linesize, block[1]);
207 119700 a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
208 119700 a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
209
210
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119700 if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) {
211 119700 a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
212 119700 a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
213 }
214 119700 }
215
216 400 static int decode_frame(AVCodecContext *avctx, AVFrame *p,
217 int *got_frame, AVPacket *avpkt)
218 {
219 400 ASV1Context *const a = avctx->priv_data;
220 400 const uint8_t *buf = avpkt->data;
221 400 int buf_size = avpkt->size;
222 int mb_x, mb_y, ret;
223
224
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400 if (buf_size * 8LL < a->mb_height * a->mb_width * 13LL)
225 return AVERROR_INVALIDDATA;
226
227
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400 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
228 return ret;
229 400 p->pict_type = AV_PICTURE_TYPE_I;
230 400 p->key_frame = 1;
231
232
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400 if (avctx->codec_id == AV_CODEC_ID_ASV1) {
233 200 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
234 buf_size);
235
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200 if (!a->bitstream_buffer)
236 return AVERROR(ENOMEM);
237
238 200 a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,
239 (const uint32_t *) buf, buf_size / 4);
240 200 ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size);
241 } else {
242 200 ret = init_get_bits8_le(&a->gb, buf, buf_size);
243 }
244
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400 if (ret < 0)
245 return ret;
246
247
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6000 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
248
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124800 for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
249
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119200 if ((ret = decode_mb(a, a->block)) < 0)
250 return ret;
251
252 119200 idct_put(a, p, mb_x, mb_y);
253 }
254 }
255
256
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400 if (a->mb_width2 != a->mb_width) {
257 100 mb_x = a->mb_width2;
258
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300 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
259
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200 if ((ret = decode_mb(a, a->block)) < 0)
260 return ret;
261
262 200 idct_put(a, p, mb_x, mb_y);
263 }
264 }
265
266
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400 if (a->mb_height2 != a->mb_height) {
267 100 mb_y = a->mb_height2;
268
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400 for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
269
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300 if ((ret = decode_mb(a, a->block)) < 0)
270 return ret;
271
272 300 idct_put(a, p, mb_x, mb_y);
273 }
274 }
275
276 400 *got_frame = 1;
277
278 400 emms_c();
279
280 400 return (get_bits_count(&a->gb) + 31) / 32 * 4;
281 }
282
283 18 static av_cold int decode_init(AVCodecContext *avctx)
284 {
285 static AVOnce init_static_once = AV_ONCE_INIT;
286 18 ASV1Context *const a = avctx->priv_data;
287
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18 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
288 int i;
289
290
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18 if (avctx->extradata_size < 1) {
291 av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");
292 }
293
294 18 ff_asv_common_init(avctx);
295 18 ff_blockdsp_init(&a->bdsp, avctx);
296 18 ff_idctdsp_init(&a->idsp, avctx);
297 18 ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab);
298 18 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
299
300
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18 if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {
301 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
302 if (avctx->codec_id == AV_CODEC_ID_ASV1)
303 a->inv_qscale = 6;
304 else
305 a->inv_qscale = 10;
306 }
307
308
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1170 for (i = 0; i < 64; i++) {
309 1152 int index = ff_asv_scantab[i];
310
311 1152 a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] /
312 1152 a->inv_qscale;
313 }
314
315 18 ff_thread_once(&init_static_once, init_vlcs);
316
317 18 return 0;
318 }
319
320 9 static av_cold int decode_end(AVCodecContext *avctx)
321 {
322 9 ASV1Context *const a = avctx->priv_data;
323
324 9 av_freep(&a->bitstream_buffer);
325 9 a->bitstream_buffer_size = 0;
326
327 9 return 0;
328 }
329
330 #if CONFIG_ASV1_DECODER
331 const FFCodec ff_asv1_decoder = {
332 .p.name = "asv1",
333 .p.long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
334 .p.type = AVMEDIA_TYPE_VIDEO,
335 .p.id = AV_CODEC_ID_ASV1,
336 .priv_data_size = sizeof(ASV1Context),
337 .init = decode_init,
338 .close = decode_end,
339 FF_CODEC_DECODE_CB(decode_frame),
340 .p.capabilities = AV_CODEC_CAP_DR1,
341 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
342 };
343 #endif
344
345 #if CONFIG_ASV2_DECODER
346 const FFCodec ff_asv2_decoder = {
347 .p.name = "asv2",
348 .p.long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
349 .p.type = AVMEDIA_TYPE_VIDEO,
350 .p.id = AV_CODEC_ID_ASV2,
351 .priv_data_size = sizeof(ASV1Context),
352 .init = decode_init,
353 FF_CODEC_DECODE_CB(decode_frame),
354 .p.capabilities = AV_CODEC_CAP_DR1,
355 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
356 };
357 #endif
358