FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/aacps_common.c
Date: 2021-09-26 18:22:30
Exec Total Coverage
Lines: 107 134 79.9%
Branches: 111 128 86.7%

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1 /*
2 * Functions common to fixed/float MPEG-4 Parametric Stereo decoding
3 * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include <stdint.h>
23 #include "libavutil/common.h"
24 #include "libavutil/thread.h"
25 #include "aacps.h"
26 #include "get_bits.h"
27 #include "aacpsdata.c"
28
29 static const int8_t num_env_tab[2][4] = {
30 { 0, 1, 2, 4, },
31 { 1, 2, 3, 4, },
32 };
33
34 static const int8_t nr_iidicc_par_tab[] = {
35 10, 20, 34, 10, 20, 34,
36 };
37
38 static const int8_t nr_iidopd_par_tab[] = {
39 5, 11, 17, 5, 11, 17,
40 };
41
42 enum {
43 huff_iid_df1,
44 huff_iid_dt1,
45 huff_iid_df0,
46 huff_iid_dt0,
47 huff_icc_df,
48 huff_icc_dt,
49 huff_ipd_df,
50 huff_ipd_dt,
51 huff_opd_df,
52 huff_opd_dt,
53 };
54
55 static const int huff_iid[] = {
56 huff_iid_df0,
57 huff_iid_df1,
58 huff_iid_dt0,
59 huff_iid_dt1,
60 };
61
62 static VLC vlc_ps[10];
63
64 #define READ_PAR_DATA(PAR, OFFSET, MASK, ERR_CONDITION, NB_BITS, MAX_DEPTH) \
65 /** \
66 * Read Inter-channel Intensity Difference/Inter-Channel Coherence/ \
67 * Inter-channel Phase Difference/Overall Phase Difference parameters from the \
68 * bitstream. \
69 * \
70 * @param avctx contains the current codec context \
71 * @param gb pointer to the input bitstream \
72 * @param ps pointer to the Parametric Stereo context \
73 * @param PAR pointer to the parameter to be read \
74 * @param e envelope to decode \
75 * @param dt 1: time delta-coded, 0: frequency delta-coded \
76 */ \
77 static int read_ ## PAR ## _data(AVCodecContext *avctx, GetBitContext *gb, PSCommonContext *ps, \
78 int8_t (*PAR)[PS_MAX_NR_IIDICC], int table_idx, int e, int dt) \
79 { \
80 int b, num = ps->nr_ ## PAR ## _par; \
81 VLC_TYPE (*vlc_table)[2] = vlc_ps[table_idx].table; \
82 if (dt) { \
83 int e_prev = e ? e - 1 : ps->num_env_old - 1; \
84 e_prev = FFMAX(e_prev, 0); \
85 for (b = 0; b < num; b++) { \
86 int val = PAR[e_prev][b] + get_vlc2(gb, vlc_table, NB_BITS, MAX_DEPTH) - OFFSET; \
87 if (MASK) val &= MASK; \
88 PAR[e][b] = val; \
89 if (ERR_CONDITION) \
90 goto err; \
91 } \
92 } else { \
93 int val = 0; \
94 for (b = 0; b < num; b++) { \
95 val += get_vlc2(gb, vlc_table, NB_BITS, MAX_DEPTH) - OFFSET; \
96 if (MASK) val &= MASK; \
97 PAR[e][b] = val; \
98 if (ERR_CONDITION) \
99 goto err; \
100 } \
101 } \
102 return 0; \
103 err: \
104 av_log(avctx, AV_LOG_ERROR, "illegal "#PAR"\n"); \
105 return AVERROR_INVALIDDATA; \
106 }
107
108
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38305 READ_PAR_DATA(iid, huff_offset[table_idx], 0, FFABS(ps->iid_par[e][b]) > 7 + 8 * ps->iid_quant, 9, 3)
109
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38330 READ_PAR_DATA(icc, huff_offset[table_idx], 0, ps->icc_par[e][b] > 7U, 9, 2)
110
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2472 READ_PAR_DATA(ipdopd, 0, 0x07, 0, 5, 1)
111
112 53 static int ps_read_extension_data(GetBitContext *gb, PSCommonContext *ps,
113 int ps_extension_id)
114 {
115 int e;
116 53 int count = get_bits_count(gb);
117
118
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53 if (ps_extension_id)
119 return 0;
120
121 53 ps->enable_ipdopd = get_bits1(gb);
122
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53 if (ps->enable_ipdopd) {
123
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156 for (e = 0; e < ps->num_env; e++) {
124 103 int dt = get_bits1(gb);
125
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103 read_ipdopd_data(NULL, gb, ps, ps->ipd_par, dt ? huff_ipd_dt : huff_ipd_df, e, dt);
126 103 dt = get_bits1(gb);
127
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103 read_ipdopd_data(NULL, gb, ps, ps->opd_par, dt ? huff_opd_dt : huff_opd_df, e, dt);
128 }
129 }
130 53 skip_bits1(gb); //reserved_ps
131 53 return get_bits_count(gb) - count;
132 }
133
134 1616 int ff_ps_read_data(AVCodecContext *avctx, GetBitContext *gb_host,
135 PSCommonContext *ps, int bits_left)
136 {
137 int e;
138 1616 int bit_count_start = get_bits_count(gb_host);
139 int header;
140 int bits_consumed;
141 1616 GetBitContext gbc = *gb_host, *gb = &gbc;
142
143 1616 header = get_bits1(gb);
144
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1616 if (header) { //enable_ps_header
145 307 ps->enable_iid = get_bits1(gb);
146
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307 if (ps->enable_iid) {
147 175 int iid_mode = get_bits(gb, 3);
148
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175 if (iid_mode > 5) {
149 av_log(avctx, AV_LOG_ERROR, "iid_mode %d is reserved.\n",
150 iid_mode);
151 goto err;
152 }
153 175 ps->nr_iid_par = nr_iidicc_par_tab[iid_mode];
154 175 ps->iid_quant = iid_mode > 2;
155 175 ps->nr_ipdopd_par = nr_iidopd_par_tab[iid_mode];
156 }
157 307 ps->enable_icc = get_bits1(gb);
158
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307 if (ps->enable_icc) {
159 262 ps->icc_mode = get_bits(gb, 3);
160
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262 if (ps->icc_mode > 5) {
161 av_log(avctx, AV_LOG_ERROR, "icc_mode %d is reserved.\n",
162 ps->icc_mode);
163 goto err;
164 }
165 262 ps->nr_icc_par = nr_iidicc_par_tab[ps->icc_mode];
166 }
167 307 ps->enable_ext = get_bits1(gb);
168 }
169
170 1616 ps->frame_class = get_bits1(gb);
171 1616 ps->num_env_old = ps->num_env;
172 1616 ps->num_env = num_env_tab[ps->frame_class][get_bits(gb, 2)];
173
174 1616 ps->border_position[0] = -1;
175
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1616 if (ps->frame_class) {
176
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940 for (e = 1; e <= ps->num_env; e++) {
177 671 ps->border_position[e] = get_bits(gb, 5);
178
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671 if (ps->border_position[e] < ps->border_position[e-1]) {
179 av_log(avctx, AV_LOG_ERROR, "border_position non monotone.\n");
180 goto err;
181 }
182 }
183 } else
184
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2628 for (e = 1; e <= ps->num_env; e++)
185 1281 ps->border_position[e] = (e * numQMFSlots >> ff_log2_tab[ps->num_env]) - 1;
186
187
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1616 if (ps->enable_iid) {
188
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3241 for (e = 0; e < ps->num_env; e++) {
189 1805 int dt = get_bits1(gb);
190
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1805 if (read_iid_data(avctx, gb, ps, ps->iid_par, huff_iid[2*dt+ps->iid_quant], e, dt))
191 goto err;
192 }
193 } else
194 180 memset(ps->iid_par, 0, sizeof(ps->iid_par));
195
196
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1616 if (ps->enable_icc)
197
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3300 for (e = 0; e < ps->num_env; e++) {
198 1806 int dt = get_bits1(gb);
199
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1806 if (read_icc_data(avctx, gb, ps, ps->icc_par, dt ? huff_icc_dt : huff_icc_df, e, dt))
200 goto err;
201 }
202 else
203 122 memset(ps->icc_par, 0, sizeof(ps->icc_par));
204
205
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1616 if (ps->enable_ext) {
206 53 int cnt = get_bits(gb, 4);
207
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53 if (cnt == 15) {
208 cnt += get_bits(gb, 8);
209 }
210 53 cnt *= 8;
211
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106 while (cnt > 7) {
212 53 int ps_extension_id = get_bits(gb, 2);
213 53 cnt -= 2 + ps_read_extension_data(gb, ps, ps_extension_id);
214 }
215
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53 if (cnt < 0) {
216 av_log(avctx, AV_LOG_ERROR, "ps extension overflow %d\n", cnt);
217 goto err;
218 }
219 53 skip_bits(gb, cnt);
220 }
221
222 1616 ps->enable_ipdopd &= !PS_BASELINE;
223
224 //Fix up envelopes
225
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1616 if (!ps->num_env || ps->border_position[ps->num_env] < numQMFSlots - 1) {
226 //Create a fake envelope
227
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81 int source = ps->num_env ? ps->num_env - 1 : ps->num_env_old - 1;
228 int b;
229
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81 if (source >= 0 && source != ps->num_env) {
230
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29 if (ps->enable_iid) {
231 21 memcpy(ps->iid_par+ps->num_env, ps->iid_par+source, sizeof(ps->iid_par[0]));
232 }
233
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29 if (ps->enable_icc) {
234 21 memcpy(ps->icc_par+ps->num_env, ps->icc_par+source, sizeof(ps->icc_par[0]));
235 }
236
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29 if (ps->enable_ipdopd) {
237 memcpy(ps->ipd_par+ps->num_env, ps->ipd_par+source, sizeof(ps->ipd_par[0]));
238 memcpy(ps->opd_par+ps->num_env, ps->opd_par+source, sizeof(ps->opd_par[0]));
239 }
240 }
241
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81 if (ps->enable_iid){
242
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756 for (b = 0; b < ps->nr_iid_par; b++) {
243
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720 if (FFABS(ps->iid_par[ps->num_env][b]) > 7 + 8 * ps->iid_quant) {
244 av_log(avctx, AV_LOG_ERROR, "iid_par invalid\n");
245 goto err;
246 }
247 }
248 }
249
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81 if (ps->enable_icc){
250
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882 for (b = 0; b < ps->nr_iid_par; b++) {
251
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840 if (ps->icc_par[ps->num_env][b] > 7U) {
252 av_log(avctx, AV_LOG_ERROR, "icc_par invalid\n");
253 goto err;
254 }
255 }
256 }
257 81 ps->num_env++;
258 81 ps->border_position[ps->num_env] = numQMFSlots - 1;
259 }
260
261
262 1616 ps->is34bands_old = ps->is34bands;
263
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1616 if (!PS_BASELINE && (ps->enable_iid || ps->enable_icc))
264
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3045 ps->is34bands = (ps->enable_iid && ps->nr_iid_par == 34) ||
265
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1498 (ps->enable_icc && ps->nr_icc_par == 34);
266
267 //Baseline
268
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1616 if (!ps->enable_ipdopd) {
269 1563 memset(ps->ipd_par, 0, sizeof(ps->ipd_par));
270 1563 memset(ps->opd_par, 0, sizeof(ps->opd_par));
271 }
272
273
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1616 if (header)
274 307 ps->start = 1;
275
276 1616 bits_consumed = get_bits_count(gb) - bit_count_start;
277
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1616 if (bits_consumed <= bits_left) {
278 1616 skip_bits_long(gb_host, bits_consumed);
279 1616 return bits_consumed;
280 }
281 av_log(avctx, AV_LOG_ERROR, "Expected to read %d PS bits actually read %d.\n", bits_left, bits_consumed);
282 err:
283 ps->start = 0;
284 skip_bits_long(gb_host, bits_left);
285 memset(ps->iid_par, 0, sizeof(ps->iid_par));
286 memset(ps->icc_par, 0, sizeof(ps->icc_par));
287 memset(ps->ipd_par, 0, sizeof(ps->ipd_par));
288 memset(ps->opd_par, 0, sizeof(ps->opd_par));
289 return bits_left;
290 }
291
292 #define PS_INIT_VLC_STATIC(num, nb_bits, size) \
293 INIT_VLC_STATIC(&vlc_ps[num], nb_bits, ps_tmp[num].table_size / ps_tmp[num].elem_size, \
294 ps_tmp[num].ps_bits, 1, 1, \
295 ps_tmp[num].ps_codes, ps_tmp[num].elem_size, ps_tmp[num].elem_size, \
296 size);
297
298 #define PS_VLC_ROW(name) \
299 { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
300
301 154 static av_cold void ps_init_common(void)
302 {
303 // Syntax initialization
304 static const struct {
305 const void *ps_codes, *ps_bits;
306 const unsigned int table_size, elem_size;
307 } ps_tmp[] = {
308 PS_VLC_ROW(huff_iid_df1),
309 PS_VLC_ROW(huff_iid_dt1),
310 PS_VLC_ROW(huff_iid_df0),
311 PS_VLC_ROW(huff_iid_dt0),
312 PS_VLC_ROW(huff_icc_df),
313 PS_VLC_ROW(huff_icc_dt),
314 PS_VLC_ROW(huff_ipd_df),
315 PS_VLC_ROW(huff_ipd_dt),
316 PS_VLC_ROW(huff_opd_df),
317 PS_VLC_ROW(huff_opd_dt),
318 };
319
320 154 PS_INIT_VLC_STATIC(0, 9, 1544);
321 154 PS_INIT_VLC_STATIC(1, 9, 832);
322 154 PS_INIT_VLC_STATIC(2, 9, 1024);
323 154 PS_INIT_VLC_STATIC(3, 9, 1036);
324 154 PS_INIT_VLC_STATIC(4, 9, 544);
325 154 PS_INIT_VLC_STATIC(5, 9, 544);
326 154 PS_INIT_VLC_STATIC(6, 5, 32);
327 154 PS_INIT_VLC_STATIC(7, 5, 32);
328 154 PS_INIT_VLC_STATIC(8, 5, 32);
329 154 PS_INIT_VLC_STATIC(9, 5, 32);
330 154 }
331
332 167 av_cold void ff_ps_init_common(void)
333 {
334 static AVOnce init_static_once = AV_ONCE_INIT;
335 167 ff_thread_once(&init_static_once, ps_init_common);
336 167 }
337