GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/aacps_common.c Lines: 107 134 79.9 %
Date: 2021-04-18 10:33:33 Branches: 111 128 86.7 %

Line Branch Exec Source
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



38305
READ_PAR_DATA(iid,    huff_offset[table_idx],    0, FFABS(ps->iid_par[e][b]) > 7 + 8 * ps->iid_quant, 9, 3)
109



38330
READ_PAR_DATA(icc,    huff_offset[table_idx],    0, ps->icc_par[e][b] > 7U, 9, 2)
110


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
53
    if (ps_extension_id)
119
        return 0;
120
121
53
    ps->enable_ipdopd = get_bits1(gb);
122
53
    if (ps->enable_ipdopd) {
123
156
        for (e = 0; e < ps->num_env; e++) {
124
103
            int dt = get_bits1(gb);
125
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
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
1616
    if (header) {     //enable_ps_header
145
307
        ps->enable_iid = get_bits1(gb);
146
307
        if (ps->enable_iid) {
147
175
            int iid_mode = get_bits(gb, 3);
148
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
307
        if (ps->enable_icc) {
159
262
            ps->icc_mode = get_bits(gb, 3);
160
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
1616
    if (ps->frame_class) {
176
940
        for (e = 1; e <= ps->num_env; e++) {
177
671
            ps->border_position[e] = get_bits(gb, 5);
178
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
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
1616
    if (ps->enable_iid) {
188
3241
        for (e = 0; e < ps->num_env; e++) {
189
1805
            int dt = get_bits1(gb);
190
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
1616
    if (ps->enable_icc)
197
3300
        for (e = 0; e < ps->num_env; e++) {
198
1806
            int dt = get_bits1(gb);
199

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
1616
    if (ps->enable_ext) {
206
53
        int cnt = get_bits(gb, 4);
207
53
        if (cnt == 15) {
208
            cnt += get_bits(gb, 8);
209
        }
210
53
        cnt *= 8;
211
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
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

1616
    if (!ps->num_env || ps->border_position[ps->num_env] < numQMFSlots - 1) {
226
        //Create a fake envelope
227
81
        int source = ps->num_env ? ps->num_env - 1 : ps->num_env_old - 1;
228
        int b;
229

81
        if (source >= 0 && source != ps->num_env) {
230
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
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
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
81
        if (ps->enable_iid){
242
756
            for (b = 0; b < ps->nr_iid_par; b++) {
243
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
81
        if (ps->enable_icc){
250
882
            for (b = 0; b < ps->nr_iid_par; b++) {
251
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

1616
    if (!PS_BASELINE && (ps->enable_iid || ps->enable_icc))
264

3045
        ps->is34bands = (ps->enable_iid && ps->nr_iid_par == 34) ||
265

1498
                        (ps->enable_icc && ps->nr_icc_par == 34);
266
267
    //Baseline
268
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
1616
    if (header)
274
307
        ps->start = 1;
275
276
1616
    bits_consumed = get_bits_count(gb) - bit_count_start;
277
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
}