GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mpc7.c Lines: 147 175 84.0 %
Date: 2021-01-21 21:11:50 Branches: 67 87 77.0 %

Line Branch Exec Source
1
/*
2
 * Musepack SV7 decoder
3
 * Copyright (c) 2006 Konstantin Shishkov
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
/**
23
 * @file
24
 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
25
 * divided into 32 subbands.
26
 */
27
28
#include "libavutil/channel_layout.h"
29
#include "libavutil/internal.h"
30
#include "libavutil/lfg.h"
31
#include "libavutil/mem_internal.h"
32
#include "libavutil/thread.h"
33
34
#include "avcodec.h"
35
#include "get_bits.h"
36
#include "internal.h"
37
#include "mpegaudiodsp.h"
38
39
#include "mpc.h"
40
#include "mpc7data.h"
41
42
static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];
43
44
2
static av_cold void mpc7_init_static(void)
45
{
46
    static VLC_TYPE quant_tables[7224][2];
47
2
    const uint8_t *raw_quant_table = mpc7_quant_vlcs;
48
49
2
    INIT_VLC_STATIC_FROM_LENGTHS(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
50
                                 &mpc7_scfi[1], 2,
51
                                 &mpc7_scfi[0], 2, 1, 0, 0, 1 << MPC7_SCFI_BITS);
52
2
    INIT_VLC_STATIC_FROM_LENGTHS(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
53
                                 &mpc7_dscf[1], 2,
54
                                 &mpc7_dscf[0], 2, 1, -7, 0, 1 << MPC7_DSCF_BITS);
55
2
    INIT_VLC_STATIC_FROM_LENGTHS(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
56
                                 &mpc7_hdr[1], 2,
57
                                 &mpc7_hdr[0], 2, 1, -5, 0, 1 << MPC7_HDR_BITS);
58
16
    for (unsigned i = 0, offset = 0; i < MPC7_QUANT_VLC_TABLES; i++){
59
42
        for (int j = 0; j < 2; j++) {
60
28
            quant_vlc[i][j].table           = &quant_tables[offset];
61
28
            quant_vlc[i][j].table_allocated = FF_ARRAY_ELEMS(quant_tables) - offset;
62
28
            ff_init_vlc_from_lengths(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
63
28
                                     &raw_quant_table[1], 2,
64
                                     &raw_quant_table[0], 2, 1,
65
28
                                     mpc7_quant_vlc_off[i],
66
                                     INIT_VLC_STATIC_OVERLONG, NULL);
67
28
            raw_quant_table += 2 * mpc7_quant_vlc_sizes[i];
68
28
            offset          += quant_vlc[i][j].table_size;
69
        }
70
    }
71
2
    ff_mpa_synth_init_fixed();
72
2
}
73
74
3
static av_cold int mpc7_decode_init(AVCodecContext * avctx)
75
{
76
    static AVOnce init_static_once = AV_ONCE_INIT;
77
3
    MPCContext *c = avctx->priv_data;
78
    GetBitContext gb;
79
3
    LOCAL_ALIGNED_16(uint8_t, buf, [16]);
80
81
    /* Musepack SV7 is always stereo */
82
3
    if (avctx->channels != 2) {
83
        avpriv_request_sample(avctx, "%d channels", avctx->channels);
84
        return AVERROR_PATCHWELCOME;
85
    }
86
87
3
    if(avctx->extradata_size < 16){
88
        av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
89
        return AVERROR_INVALIDDATA;
90
    }
91
3
    memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
92
3
    av_lfg_init(&c->rnd, 0xDEADBEEF);
93
3
    ff_bswapdsp_init(&c->bdsp);
94
3
    ff_mpadsp_init(&c->mpadsp);
95
3
    c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4);
96
3
    init_get_bits(&gb, buf, 128);
97
98
3
    c->IS = get_bits1(&gb);
99
3
    c->MSS = get_bits1(&gb);
100
3
    c->maxbands = get_bits(&gb, 6);
101
3
    if(c->maxbands >= BANDS){
102
        av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
103
        return AVERROR_INVALIDDATA;
104
    }
105
3
    skip_bits_long(&gb, 88);
106
3
    c->gapless = get_bits1(&gb);
107
3
    c->lastframelen = get_bits(&gb, 11);
108
3
    av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
109
            c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
110
3
    c->frames_to_skip = 0;
111
112
3
    avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
113
3
    avctx->channel_layout = AV_CH_LAYOUT_STEREO;
114
115
3
    ff_thread_once(&init_static_once, mpc7_init_static);
116
117
3
    return 0;
118
}
119
120
/**
121
 * Fill samples for given subband
122
 */
123
29184
static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
124
{
125
    int i, i1, t;
126

29184
    switch(idx){
127
    case -1:
128
        for(i = 0; i < SAMPLES_PER_BAND; i++){
129
            *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
130
        }
131
        break;
132
3499
    case 1:
133
3499
        i1 = get_bits1(gb);
134
45487
        for(i = 0; i < SAMPLES_PER_BAND/3; i++){
135
41988
            t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
136
41988
            *dst++ = mpc7_idx30[t];
137
41988
            *dst++ = mpc7_idx31[t];
138
41988
            *dst++ = mpc7_idx32[t];
139
        }
140
3499
        break;
141
6128
    case 2:
142
6128
        i1 = get_bits1(gb);
143
116432
        for(i = 0; i < SAMPLES_PER_BAND/2; i++){
144
110304
            t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
145
110304
            *dst++ = mpc7_idx50[t];
146
110304
            *dst++ = mpc7_idx51[t];
147
        }
148
6128
        break;
149
7935
    case  3: case  4: case  5: case  6: case  7:
150
7935
        i1 = get_bits1(gb);
151
293595
        for(i = 0; i < SAMPLES_PER_BAND; i++)
152
285660
            *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2);
153
7935
        break;
154
720
    case  8: case  9: case 10: case 11: case 12:
155
    case 13: case 14: case 15: case 16: case 17:
156
720
        t = (1 << (idx - 2)) - 1;
157
26640
        for(i = 0; i < SAMPLES_PER_BAND; i++)
158
25920
            *dst++ = get_bits(gb, idx - 1) - t;
159
720
        break;
160
10902
    default: // case 0 and -2..-17
161
10902
        return;
162
    }
163
}
164
165
31340
static int get_scale_idx(GetBitContext *gb, int ref)
166
{
167
31340
    int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1);
168
31340
    if (t == 8)
169
3784
        return get_bits(gb, 6);
170
27556
    return ref + t;
171
}
172
173
456
static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
174
                             int *got_frame_ptr, AVPacket *avpkt)
175
{
176
456
    AVFrame *frame     = data;
177
456
    const uint8_t *buf = avpkt->data;
178
    int buf_size;
179
456
    MPCContext *c = avctx->priv_data;
180
    GetBitContext gb;
181
    int i, ch;
182
456
    int mb = -1;
183
456
    Band *bands = c->bands;
184
    int off, ret, last_frame, skip;
185
    int bits_used, bits_avail;
186
187
456
    memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
188
189
456
    buf_size = avpkt->size & ~3;
190
456
    if (buf_size <= 0) {
191
        av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
192
               avpkt->size);
193
        return AVERROR_INVALIDDATA;
194
    }
195
456
    if (buf_size != avpkt->size) {
196
        av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
197
               "extra bytes at the end will be skipped.\n");
198
    }
199
200
456
    skip       = buf[0];
201
456
    last_frame = buf[1];
202
456
    buf       += 4;
203
456
    buf_size  -= 4;
204
205
    /* get output buffer */
206
456
    frame->nb_samples = MPC_FRAME_SIZE;
207
456
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
208
        return ret;
209
210
456
    av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
211
456
    if (!c->bits)
212
        return AVERROR(ENOMEM);
213
456
    c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf,
214
                      buf_size >> 2);
215
456
    if ((ret = init_get_bits8(&gb, c->bits, buf_size)) < 0)
216
        return ret;
217
456
    skip_bits_long(&gb, skip);
218
219
    /* read subband indexes */
220
13680
    for(i = 0; i <= c->maxbands; i++){
221
39672
        for(ch = 0; ch < 2; ch++){
222
26448
            int t = i ? get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) : 4;
223
26448
            if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
224
25465
            else bands[i].res[ch] = bands[i-1].res[ch] + t;
225

26448
            if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) {
226
                av_log(avctx, AV_LOG_ERROR, "subband index invalid\n");
227
                return AVERROR_INVALIDDATA;
228
            }
229
        }
230
231

13224
        if(bands[i].res[0] || bands[i].res[1]){
232
10414
            mb = i;
233
10414
            if(c->MSS) bands[i].msf = get_bits1(&gb);
234
        }
235
    }
236
    /* get scale indexes coding method */
237
10870
    for(i = 0; i <= mb; i++)
238
31242
        for(ch = 0; ch < 2; ch++)
239
20828
            if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1);
240
    /* get scale indexes */
241
10870
    for(i = 0; i <= mb; i++){
242
31242
        for(ch = 0; ch < 2; ch++){
243
20828
            if(bands[i].res[ch]){
244
18282
                bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
245
18282
                bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]);
246

18282
                switch(bands[i].scfi[ch]){
247
1558
                case 0:
248
1558
                    bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
249
1558
                    bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
250
1558
                    break;
251
2381
                case 1:
252
2381
                    bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
253
2381
                    bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
254
2381
                    break;
255
7561
                case 2:
256
7561
                    bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
257
7561
                    bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
258
7561
                    break;
259
6782
                case 3:
260
6782
                    bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
261
6782
                    break;
262
                }
263
18282
                c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
264
            }
265
        }
266
    }
267
    /* get quantizers */
268
456
    memset(c->Q, 0, sizeof(c->Q));
269
456
    off = 0;
270
15048
    for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
271
43776
        for(ch = 0; ch < 2; ch++)
272
29184
            idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
273
274
456
    ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2);
275
456
    if(last_frame)
276
        frame->nb_samples = c->lastframelen;
277
278
456
    bits_used = get_bits_count(&gb);
279
456
    bits_avail = buf_size * 8;
280

456
    if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
281
        av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
282
        return AVERROR_INVALIDDATA;
283
    }
284
456
    if(c->frames_to_skip){
285
        c->frames_to_skip--;
286
        *got_frame_ptr = 0;
287
        return avpkt->size;
288
    }
289
290
456
    *got_frame_ptr = 1;
291
292
456
    return avpkt->size;
293
}
294
295
static void mpc7_decode_flush(AVCodecContext *avctx)
296
{
297
    MPCContext *c = avctx->priv_data;
298
299
    memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
300
    c->frames_to_skip = 32;
301
}
302
303
3
static av_cold int mpc7_decode_close(AVCodecContext *avctx)
304
{
305
3
    MPCContext *c = avctx->priv_data;
306
3
    av_freep(&c->bits);
307
3
    c->buf_size = 0;
308
3
    return 0;
309
}
310
311
AVCodec ff_mpc7_decoder = {
312
    .name           = "mpc7",
313
    .long_name      = NULL_IF_CONFIG_SMALL("Musepack SV7"),
314
    .type           = AVMEDIA_TYPE_AUDIO,
315
    .id             = AV_CODEC_ID_MUSEPACK7,
316
    .priv_data_size = sizeof(MPCContext),
317
    .init           = mpc7_decode_init,
318
    .close          = mpc7_decode_close,
319
    .decode         = mpc7_decode_frame,
320
    .flush          = mpc7_decode_flush,
321
    .capabilities   = AV_CODEC_CAP_DR1,
322
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
323
                                                      AV_SAMPLE_FMT_NONE },
324
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
325
};