GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mpc7.c Lines: 149 185 80.5 %
Date: 2019-11-22 03:34:36 Branches: 73 97 75.3 %

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_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] =
42
{
43
       0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124,
44
       5636, 6164, 6676, 7224
45
};
46
47
48
3
static av_cold int mpc7_decode_init(AVCodecContext * avctx)
49
{
50
    int i, j, ret;
51
3
    MPCContext *c = avctx->priv_data;
52
    GetBitContext gb;
53
3
    LOCAL_ALIGNED_16(uint8_t, buf, [16]);
54
    static int vlc_initialized = 0;
55
56
    static VLC_TYPE scfi_table[1 << MPC7_SCFI_BITS][2];
57
    static VLC_TYPE dscf_table[1 << MPC7_DSCF_BITS][2];
58
    static VLC_TYPE hdr_table[1 << MPC7_HDR_BITS][2];
59
    static VLC_TYPE quant_tables[7224][2];
60
61
    /* Musepack SV7 is always stereo */
62
3
    if (avctx->channels != 2) {
63
        avpriv_request_sample(avctx, "%d channels", avctx->channels);
64
        return AVERROR_PATCHWELCOME;
65
    }
66
67
3
    if(avctx->extradata_size < 16){
68
        av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
69
        return AVERROR_INVALIDDATA;
70
    }
71
3
    memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
72
3
    av_lfg_init(&c->rnd, 0xDEADBEEF);
73
3
    ff_bswapdsp_init(&c->bdsp);
74
3
    ff_mpadsp_init(&c->mpadsp);
75
3
    c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4);
76
3
    ff_mpc_init();
77
3
    init_get_bits(&gb, buf, 128);
78
79
3
    c->IS = get_bits1(&gb);
80
3
    c->MSS = get_bits1(&gb);
81
3
    c->maxbands = get_bits(&gb, 6);
82
3
    if(c->maxbands >= BANDS){
83
        av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
84
        return AVERROR_INVALIDDATA;
85
    }
86
3
    skip_bits_long(&gb, 88);
87
3
    c->gapless = get_bits1(&gb);
88
3
    c->lastframelen = get_bits(&gb, 11);
89
3
    av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
90
            c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
91
3
    c->frames_to_skip = 0;
92
93
3
    avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
94
3
    avctx->channel_layout = AV_CH_LAYOUT_STEREO;
95
96
3
    if(vlc_initialized) return 0;
97
2
    av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
98
2
    scfi_vlc.table = scfi_table;
99
2
    scfi_vlc.table_allocated = 1 << MPC7_SCFI_BITS;
100
2
    if ((ret = init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
101
                &mpc7_scfi[1], 2, 1,
102
                &mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC))) {
103
        av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n");
104
        return ret;
105
    }
106
2
    dscf_vlc.table = dscf_table;
107
2
    dscf_vlc.table_allocated = 1 << MPC7_DSCF_BITS;
108
2
    if ((ret = init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
109
                &mpc7_dscf[1], 2, 1,
110
                &mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC))) {
111
        av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n");
112
        return ret;
113
    }
114
2
    hdr_vlc.table = hdr_table;
115
2
    hdr_vlc.table_allocated = 1 << MPC7_HDR_BITS;
116
2
    if ((ret = init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
117
                &mpc7_hdr[1], 2, 1,
118
                &mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_STATIC))) {
119
        av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n");
120
        return ret;
121
    }
122
16
    for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){
123
42
        for(j = 0; j < 2; j++){
124
28
            quant_vlc[i][j].table = &quant_tables[quant_offsets[i*2 + j]];
125
28
            quant_vlc[i][j].table_allocated = quant_offsets[i*2 + j + 1] - quant_offsets[i*2 + j];
126
28
            if ((ret = init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
127
                        &mpc7_quant_vlc[i][j][1], 4, 2,
128
                        &mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_NEW_STATIC))) {
129
                av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j);
130
                return ret;
131
            }
132
        }
133
    }
134
2
    vlc_initialized = 1;
135
136
2
    return 0;
137
}
138
139
/**
140
 * Fill samples for given subband
141
 */
142
29184
static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
143
{
144
    int i, i1, t;
145

29184
    switch(idx){
146
    case -1:
147
        for(i = 0; i < SAMPLES_PER_BAND; i++){
148
            *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
149
        }
150
        break;
151
3499
    case 1:
152
3499
        i1 = get_bits1(gb);
153
45487
        for(i = 0; i < SAMPLES_PER_BAND/3; i++){
154
41988
            t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
155
41988
            *dst++ = mpc7_idx30[t];
156
41988
            *dst++ = mpc7_idx31[t];
157
41988
            *dst++ = mpc7_idx32[t];
158
        }
159
3499
        break;
160
6128
    case 2:
161
6128
        i1 = get_bits1(gb);
162
116432
        for(i = 0; i < SAMPLES_PER_BAND/2; i++){
163
110304
            t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
164
110304
            *dst++ = mpc7_idx50[t];
165
110304
            *dst++ = mpc7_idx51[t];
166
        }
167
6128
        break;
168
7935
    case  3: case  4: case  5: case  6: case  7:
169
7935
        i1 = get_bits1(gb);
170
293595
        for(i = 0; i < SAMPLES_PER_BAND; i++)
171
285660
            *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1];
172
7935
        break;
173
720
    case  8: case  9: case 10: case 11: case 12:
174
    case 13: case 14: case 15: case 16: case 17:
175
720
        t = (1 << (idx - 2)) - 1;
176
26640
        for(i = 0; i < SAMPLES_PER_BAND; i++)
177
25920
            *dst++ = get_bits(gb, idx - 1) - t;
178
720
        break;
179
10902
    default: // case 0 and -2..-17
180
10902
        return;
181
    }
182
}
183
184
31340
static int get_scale_idx(GetBitContext *gb, int ref)
185
{
186
31340
    int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
187
31340
    if (t == 8)
188
3784
        return get_bits(gb, 6);
189
27556
    return ref + t;
190
}
191
192
456
static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
193
                             int *got_frame_ptr, AVPacket *avpkt)
194
{
195
456
    AVFrame *frame     = data;
196
456
    const uint8_t *buf = avpkt->data;
197
    int buf_size;
198
456
    MPCContext *c = avctx->priv_data;
199
    GetBitContext gb;
200
    int i, ch;
201
456
    int mb = -1;
202
456
    Band *bands = c->bands;
203
    int off, ret, last_frame, skip;
204
    int bits_used, bits_avail;
205
206
456
    memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
207
208
456
    buf_size = avpkt->size & ~3;
209
456
    if (buf_size <= 0) {
210
        av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
211
               avpkt->size);
212
        return AVERROR_INVALIDDATA;
213
    }
214
456
    if (buf_size != avpkt->size) {
215
        av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
216
               "extra bytes at the end will be skipped.\n");
217
    }
218
219
456
    skip       = buf[0];
220
456
    last_frame = buf[1];
221
456
    buf       += 4;
222
456
    buf_size  -= 4;
223
224
    /* get output buffer */
225
456
    frame->nb_samples = MPC_FRAME_SIZE;
226
456
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
227
        return ret;
228
229
456
    av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
230
456
    if (!c->bits)
231
        return AVERROR(ENOMEM);
232
456
    c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf,
233
                      buf_size >> 2);
234
456
    if ((ret = init_get_bits8(&gb, c->bits, buf_size)) < 0)
235
        return ret;
236
456
    skip_bits_long(&gb, skip);
237
238
    /* read subband indexes */
239
13680
    for(i = 0; i <= c->maxbands; i++){
240
39672
        for(ch = 0; ch < 2; ch++){
241
26448
            int t = 4;
242
26448
            if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5;
243
26448
            if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
244
25465
            else bands[i].res[ch] = bands[i-1].res[ch] + t;
245

26448
            if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) {
246
                av_log(avctx, AV_LOG_ERROR, "subband index invalid\n");
247
                return AVERROR_INVALIDDATA;
248
            }
249
        }
250
251

13224
        if(bands[i].res[0] || bands[i].res[1]){
252
10414
            mb = i;
253
10414
            if(c->MSS) bands[i].msf = get_bits1(&gb);
254
        }
255
    }
256
    /* get scale indexes coding method */
257
10870
    for(i = 0; i <= mb; i++)
258
31242
        for(ch = 0; ch < 2; ch++)
259
20828
            if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1);
260
    /* get scale indexes */
261
10870
    for(i = 0; i <= mb; i++){
262
31242
        for(ch = 0; ch < 2; ch++){
263
20828
            if(bands[i].res[ch]){
264
18282
                bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
265
18282
                bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]);
266

18282
                switch(bands[i].scfi[ch]){
267
1558
                case 0:
268
1558
                    bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
269
1558
                    bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
270
1558
                    break;
271
2381
                case 1:
272
2381
                    bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
273
2381
                    bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
274
2381
                    break;
275
7561
                case 2:
276
7561
                    bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
277
7561
                    bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
278
7561
                    break;
279
6782
                case 3:
280
6782
                    bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
281
6782
                    break;
282
                }
283
18282
                c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
284
            }
285
        }
286
    }
287
    /* get quantizers */
288
456
    memset(c->Q, 0, sizeof(c->Q));
289
456
    off = 0;
290
15048
    for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
291
43776
        for(ch = 0; ch < 2; ch++)
292
29184
            idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
293
294
456
    ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2);
295
456
    if(last_frame)
296
        frame->nb_samples = c->lastframelen;
297
298
456
    bits_used = get_bits_count(&gb);
299
456
    bits_avail = buf_size * 8;
300

456
    if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
301
        av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
302
        return AVERROR_INVALIDDATA;
303
    }
304
456
    if(c->frames_to_skip){
305
        c->frames_to_skip--;
306
        *got_frame_ptr = 0;
307
        return avpkt->size;
308
    }
309
310
456
    *got_frame_ptr = 1;
311
312
456
    return avpkt->size;
313
}
314
315
static void mpc7_decode_flush(AVCodecContext *avctx)
316
{
317
    MPCContext *c = avctx->priv_data;
318
319
    memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
320
    c->frames_to_skip = 32;
321
}
322
323
3
static av_cold int mpc7_decode_close(AVCodecContext *avctx)
324
{
325
3
    MPCContext *c = avctx->priv_data;
326
3
    av_freep(&c->bits);
327
3
    c->buf_size = 0;
328
3
    return 0;
329
}
330
331
AVCodec ff_mpc7_decoder = {
332
    .name           = "mpc7",
333
    .long_name      = NULL_IF_CONFIG_SMALL("Musepack SV7"),
334
    .type           = AVMEDIA_TYPE_AUDIO,
335
    .id             = AV_CODEC_ID_MUSEPACK7,
336
    .priv_data_size = sizeof(MPCContext),
337
    .init           = mpc7_decode_init,
338
    .close          = mpc7_decode_close,
339
    .decode         = mpc7_decode_frame,
340
    .flush          = mpc7_decode_flush,
341
    .capabilities   = AV_CODEC_CAP_DR1,
342
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
343
                                                      AV_SAMPLE_FMT_NONE },
344
};