GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mpc7.c Lines: 147 175 84.0 %
Date: 2020-09-25 23:16:12 Branches: 69 89 77.5 %

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 "avcodec.h"
32
#include "get_bits.h"
33
#include "internal.h"
34
#include "mpegaudiodsp.h"
35
36
#include "mpc.h"
37
#include "mpc7data.h"
38
39
static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];
40
41
static const uint16_t quant_sizes[MPC7_QUANT_VLC_TABLES*2] =
42
{
43
    512, 512, 512, 516, 512, 512, 512, 512, 512, 512, 512, 528, 512, 548
44
};
45
46
47
3
static av_cold int mpc7_decode_init(AVCodecContext * avctx)
48
{
49
    int i, j;
50
3
    MPCContext *c = avctx->priv_data;
51
    GetBitContext gb;
52
3
    LOCAL_ALIGNED_16(uint8_t, buf, [16]);
53
    static int vlc_initialized = 0;
54
55
    static VLC_TYPE quant_tables[7224][2];
56
3
    VLC_TYPE (*quant_table)[2] = quant_tables;
57
3
    const uint16_t *raw_quant_table = mpc7_quant_vlcs;
58
59
    /* Musepack SV7 is always stereo */
60
3
    if (avctx->channels != 2) {
61
        avpriv_request_sample(avctx, "%d channels", avctx->channels);
62
        return AVERROR_PATCHWELCOME;
63
    }
64
65
3
    if(avctx->extradata_size < 16){
66
        av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
67
        return AVERROR_INVALIDDATA;
68
    }
69
3
    memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
70
3
    av_lfg_init(&c->rnd, 0xDEADBEEF);
71
3
    ff_bswapdsp_init(&c->bdsp);
72
3
    ff_mpadsp_init(&c->mpadsp);
73
3
    c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4);
74
3
    ff_mpc_init();
75
3
    init_get_bits(&gb, buf, 128);
76
77
3
    c->IS = get_bits1(&gb);
78
3
    c->MSS = get_bits1(&gb);
79
3
    c->maxbands = get_bits(&gb, 6);
80
3
    if(c->maxbands >= BANDS){
81
        av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
82
        return AVERROR_INVALIDDATA;
83
    }
84
3
    skip_bits_long(&gb, 88);
85
3
    c->gapless = get_bits1(&gb);
86
3
    c->lastframelen = get_bits(&gb, 11);
87
3
    av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
88
            c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
89
3
    c->frames_to_skip = 0;
90
91
3
    avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
92
3
    avctx->channel_layout = AV_CH_LAYOUT_STEREO;
93
94
3
    if(vlc_initialized) return 0;
95
2
    av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
96
2
    INIT_VLC_STATIC(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
97
                    &mpc7_scfi[1], 2, 1,
98
                    &mpc7_scfi[0], 2, 1, 1 << MPC7_SCFI_BITS);
99
2
    INIT_VLC_STATIC(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
100
                    &mpc7_dscf[1], 2, 1,
101
                    &mpc7_dscf[0], 2, 1, 1 << MPC7_DSCF_BITS);
102
2
    INIT_VLC_STATIC(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
103
                    &mpc7_hdr[1], 2, 1,
104
                    &mpc7_hdr[0], 2, 1, 1 << MPC7_HDR_BITS);
105
16
    for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){
106
42
        for(j = 0; j < 2; j++){
107
28
            quant_vlc[i][j].table = quant_table;
108
28
            quant_vlc[i][j].table_allocated = quant_sizes[i * 2 + j];
109
28
            quant_table += quant_sizes[i * 2 + j];
110
28
            init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
111
                     raw_quant_table + 1, 4, 2,
112
                     raw_quant_table, 4, 2, INIT_VLC_USE_NEW_STATIC);
113
28
            raw_quant_table += 2 * mpc7_quant_vlc_sizes[i];
114
        }
115
    }
116
2
    vlc_initialized = 1;
117
118
2
    return 0;
119
}
120
121
/**
122
 * Fill samples for given subband
123
 */
124
29184
static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
125
{
126
    int i, i1, t;
127

29184
    switch(idx){
128
    case -1:
129
        for(i = 0; i < SAMPLES_PER_BAND; i++){
130
            *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
131
        }
132
        break;
133
3499
    case 1:
134
3499
        i1 = get_bits1(gb);
135
45487
        for(i = 0; i < SAMPLES_PER_BAND/3; i++){
136
41988
            t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
137
41988
            *dst++ = mpc7_idx30[t];
138
41988
            *dst++ = mpc7_idx31[t];
139
41988
            *dst++ = mpc7_idx32[t];
140
        }
141
3499
        break;
142
6128
    case 2:
143
6128
        i1 = get_bits1(gb);
144
116432
        for(i = 0; i < SAMPLES_PER_BAND/2; i++){
145
110304
            t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
146
110304
            *dst++ = mpc7_idx50[t];
147
110304
            *dst++ = mpc7_idx51[t];
148
        }
149
6128
        break;
150
7935
    case  3: case  4: case  5: case  6: case  7:
151
7935
        i1 = get_bits1(gb);
152
293595
        for(i = 0; i < SAMPLES_PER_BAND; i++)
153
285660
            *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1];
154
7935
        break;
155
720
    case  8: case  9: case 10: case 11: case 12:
156
    case 13: case 14: case 15: case 16: case 17:
157
720
        t = (1 << (idx - 2)) - 1;
158
26640
        for(i = 0; i < SAMPLES_PER_BAND; i++)
159
25920
            *dst++ = get_bits(gb, idx - 1) - t;
160
720
        break;
161
10902
    default: // case 0 and -2..-17
162
10902
        return;
163
    }
164
}
165
166
31340
static int get_scale_idx(GetBitContext *gb, int ref)
167
{
168
31340
    int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
169
31340
    if (t == 8)
170
3784
        return get_bits(gb, 6);
171
27556
    return ref + t;
172
}
173
174
456
static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
175
                             int *got_frame_ptr, AVPacket *avpkt)
176
{
177
456
    AVFrame *frame     = data;
178
456
    const uint8_t *buf = avpkt->data;
179
    int buf_size;
180
456
    MPCContext *c = avctx->priv_data;
181
    GetBitContext gb;
182
    int i, ch;
183
456
    int mb = -1;
184
456
    Band *bands = c->bands;
185
    int off, ret, last_frame, skip;
186
    int bits_used, bits_avail;
187
188
456
    memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
189
190
456
    buf_size = avpkt->size & ~3;
191
456
    if (buf_size <= 0) {
192
        av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
193
               avpkt->size);
194
        return AVERROR_INVALIDDATA;
195
    }
196
456
    if (buf_size != avpkt->size) {
197
        av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
198
               "extra bytes at the end will be skipped.\n");
199
    }
200
201
456
    skip       = buf[0];
202
456
    last_frame = buf[1];
203
456
    buf       += 4;
204
456
    buf_size  -= 4;
205
206
    /* get output buffer */
207
456
    frame->nb_samples = MPC_FRAME_SIZE;
208
456
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
209
        return ret;
210
211
456
    av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
212
456
    if (!c->bits)
213
        return AVERROR(ENOMEM);
214
456
    c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf,
215
                      buf_size >> 2);
216
456
    if ((ret = init_get_bits8(&gb, c->bits, buf_size)) < 0)
217
        return ret;
218
456
    skip_bits_long(&gb, skip);
219
220
    /* read subband indexes */
221
13680
    for(i = 0; i <= c->maxbands; i++){
222
39672
        for(ch = 0; ch < 2; ch++){
223
26448
            int t = 4;
224
26448
            if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5;
225
26448
            if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
226
25465
            else bands[i].res[ch] = bands[i-1].res[ch] + t;
227

26448
            if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) {
228
                av_log(avctx, AV_LOG_ERROR, "subband index invalid\n");
229
                return AVERROR_INVALIDDATA;
230
            }
231
        }
232
233

13224
        if(bands[i].res[0] || bands[i].res[1]){
234
10414
            mb = i;
235
10414
            if(c->MSS) bands[i].msf = get_bits1(&gb);
236
        }
237
    }
238
    /* get scale indexes coding method */
239
10870
    for(i = 0; i <= mb; i++)
240
31242
        for(ch = 0; ch < 2; ch++)
241
20828
            if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1);
242
    /* get scale indexes */
243
10870
    for(i = 0; i <= mb; i++){
244
31242
        for(ch = 0; ch < 2; ch++){
245
20828
            if(bands[i].res[ch]){
246
18282
                bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
247
18282
                bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]);
248

18282
                switch(bands[i].scfi[ch]){
249
1558
                case 0:
250
1558
                    bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
251
1558
                    bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
252
1558
                    break;
253
2381
                case 1:
254
2381
                    bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
255
2381
                    bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
256
2381
                    break;
257
7561
                case 2:
258
7561
                    bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
259
7561
                    bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
260
7561
                    break;
261
6782
                case 3:
262
6782
                    bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
263
6782
                    break;
264
                }
265
18282
                c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
266
            }
267
        }
268
    }
269
    /* get quantizers */
270
456
    memset(c->Q, 0, sizeof(c->Q));
271
456
    off = 0;
272
15048
    for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
273
43776
        for(ch = 0; ch < 2; ch++)
274
29184
            idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
275
276
456
    ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2);
277
456
    if(last_frame)
278
        frame->nb_samples = c->lastframelen;
279
280
456
    bits_used = get_bits_count(&gb);
281
456
    bits_avail = buf_size * 8;
282

456
    if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
283
        av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
284
        return AVERROR_INVALIDDATA;
285
    }
286
456
    if(c->frames_to_skip){
287
        c->frames_to_skip--;
288
        *got_frame_ptr = 0;
289
        return avpkt->size;
290
    }
291
292
456
    *got_frame_ptr = 1;
293
294
456
    return avpkt->size;
295
}
296
297
static void mpc7_decode_flush(AVCodecContext *avctx)
298
{
299
    MPCContext *c = avctx->priv_data;
300
301
    memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
302
    c->frames_to_skip = 32;
303
}
304
305
3
static av_cold int mpc7_decode_close(AVCodecContext *avctx)
306
{
307
3
    MPCContext *c = avctx->priv_data;
308
3
    av_freep(&c->bits);
309
3
    c->buf_size = 0;
310
3
    return 0;
311
}
312
313
AVCodec ff_mpc7_decoder = {
314
    .name           = "mpc7",
315
    .long_name      = NULL_IF_CONFIG_SMALL("Musepack SV7"),
316
    .type           = AVMEDIA_TYPE_AUDIO,
317
    .id             = AV_CODEC_ID_MUSEPACK7,
318
    .priv_data_size = sizeof(MPCContext),
319
    .init           = mpc7_decode_init,
320
    .close          = mpc7_decode_close,
321
    .decode         = mpc7_decode_frame,
322
    .flush          = mpc7_decode_flush,
323
    .capabilities   = AV_CODEC_CAP_DR1,
324
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
325
                                                      AV_SAMPLE_FMT_NONE },
326
};