GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/tta.c Lines: 140 203 69.0 %
Date: 2020-10-23 17:01:47 Branches: 73 120 60.8 %

Line Branch Exec Source
1
/*
2
 * TTA (The Lossless True Audio) decoder
3
 * Copyright (c) 2006 Alex Beregszaszi
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
 * TTA (The Lossless True Audio) decoder
25
 * @see http://www.true-audio.com/
26
 * @see http://tta.corecodec.org/
27
 * @author Alex Beregszaszi
28
 */
29
30
#include <limits.h>
31
32
#include "libavutil/crc.h"
33
#include "libavutil/intreadwrite.h"
34
#include "libavutil/opt.h"
35
36
#define BITSTREAM_READER_LE
37
#include "ttadata.h"
38
#include "ttadsp.h"
39
#include "avcodec.h"
40
#include "get_bits.h"
41
#include "thread.h"
42
#include "unary.h"
43
#include "internal.h"
44
45
#define FORMAT_SIMPLE    1
46
#define FORMAT_ENCRYPTED 2
47
48
typedef struct TTAContext {
49
    AVClass *class;
50
    AVCodecContext *avctx;
51
    const AVCRC *crc_table;
52
53
    int format, channels, bps;
54
    unsigned data_length;
55
    int frame_length, last_frame_length;
56
57
    int32_t *decode_buffer;
58
59
    uint8_t crc_pass[8];
60
    uint8_t *pass;
61
    TTAChannel *ch_ctx;
62
    TTADSPContext dsp;
63
} TTAContext;
64
65
static const int64_t tta_channel_layouts[7] = {
66
    AV_CH_LAYOUT_STEREO,
67
    AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,
68
    AV_CH_LAYOUT_QUAD,
69
    0,
70
    AV_CH_LAYOUT_5POINT1_BACK,
71
    AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER,
72
    AV_CH_LAYOUT_7POINT1_WIDE
73
};
74
75
static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
76
{
77
    uint32_t crc, CRC;
78
79
    CRC = AV_RL32(buf + buf_size);
80
    crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size);
81
    if (CRC != (crc ^ 0xFFFFFFFFU)) {
82
        av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
83
        return AVERROR_INVALIDDATA;
84
    }
85
86
    return 0;
87
}
88
89
2
static uint64_t tta_check_crc64(uint8_t *pass)
90
{
91
2
    uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U;
92
2
    uint8_t *end = pass + strlen(pass);
93
    int i;
94
95
14
    while (pass < end) {
96
12
        crc ^= (uint64_t)*pass++ << 56;
97
108
        for (i = 0; i < 8; i++)
98
96
            crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63));
99
    }
100
101
2
    return crc ^ UINT64_MAX;
102
}
103
104
20
static int allocate_buffers(AVCodecContext *avctx)
105
{
106
20
    TTAContext *s = avctx->priv_data;
107
108
20
    if (s->bps < 3) {
109
20
        s->decode_buffer = av_mallocz_array(sizeof(int32_t)*s->frame_length, s->channels);
110
20
        if (!s->decode_buffer)
111
            return AVERROR(ENOMEM);
112
    } else
113
        s->decode_buffer = NULL;
114
20
    s->ch_ctx = av_malloc_array(avctx->channels, sizeof(*s->ch_ctx));
115
20
    if (!s->ch_ctx) {
116
        av_freep(&s->decode_buffer);
117
        return AVERROR(ENOMEM);
118
    }
119
120
20
    return 0;
121
}
122
123
20
static av_cold int tta_decode_init(AVCodecContext * avctx)
124
{
125
20
    TTAContext *s = avctx->priv_data;
126
    GetBitContext gb;
127
    int total_frames;
128
    int ret;
129
130
20
    s->avctx = avctx;
131
132
    // 22 bytes for a TTA1 header
133
20
    if (avctx->extradata_size < 22)
134
        return AVERROR_INVALIDDATA;
135
136
20
    s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
137
20
    ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size);
138
20
    if (ret < 0)
139
        return ret;
140
141
20
    if (show_bits_long(&gb, 32) == AV_RL32("TTA1")) {
142
        /* signature */
143
20
        skip_bits_long(&gb, 32);
144
145
20
        s->format = get_bits(&gb, 16);
146
20
        if (s->format > 2) {
147
            av_log(avctx, AV_LOG_ERROR, "Invalid format\n");
148
            return AVERROR_INVALIDDATA;
149
        }
150
20
        if (s->format == FORMAT_ENCRYPTED) {
151
2
            if (!s->pass) {
152
                av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n");
153
                return AVERROR(EINVAL);
154
            }
155
2
            AV_WL64(s->crc_pass, tta_check_crc64(s->pass));
156
        }
157
20
        avctx->channels = s->channels = get_bits(&gb, 16);
158

20
        if (s->channels > 1 && s->channels < 9)
159
16
            avctx->channel_layout = tta_channel_layouts[s->channels-2];
160
20
        avctx->bits_per_raw_sample = get_bits(&gb, 16);
161
20
        s->bps = (avctx->bits_per_raw_sample + 7) / 8;
162
20
        avctx->sample_rate = get_bits_long(&gb, 32);
163
20
        s->data_length = get_bits_long(&gb, 32);
164
20
        skip_bits_long(&gb, 32); // CRC32 of header
165
166

20
        if (s->channels == 0 || s->channels > 16) {
167
            av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
168
            return AVERROR_INVALIDDATA;
169
20
        } else if (avctx->sample_rate == 0) {
170
            av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n");
171
            return AVERROR_INVALIDDATA;
172
        }
173
174

20
        switch(s->bps) {
175
        case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
176
20
        case 2:
177
20
            avctx->sample_fmt = AV_SAMPLE_FMT_S16;
178
20
            break;
179
        case 3:
180
            avctx->sample_fmt = AV_SAMPLE_FMT_S32;
181
            break;
182
        //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
183
        default:
184
            av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
185
            return AVERROR_INVALIDDATA;
186
        }
187
188
        // prevent overflow
189
20
        if (avctx->sample_rate > 0x7FFFFFu) {
190
            av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
191
            return AVERROR(EINVAL);
192
        }
193
20
        s->frame_length = 256 * avctx->sample_rate / 245;
194
195
20
        s->last_frame_length = s->data_length % s->frame_length;
196
40
        total_frames = s->data_length / s->frame_length +
197
20
                       (s->last_frame_length ? 1 : 0);
198
199
20
        av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",
200
            s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate,
201
            avctx->block_align);
202
20
        av_log(avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
203
            s->data_length, s->frame_length, s->last_frame_length, total_frames);
204
205
20
        if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){
206
            av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");
207
            return AVERROR_INVALIDDATA;
208
        }
209
    } else {
210
        av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
211
        return AVERROR_INVALIDDATA;
212
    }
213
214
20
    ff_ttadsp_init(&s->dsp);
215
216
20
    return allocate_buffers(avctx);
217
}
218
219
40
static int tta_decode_frame(AVCodecContext *avctx, void *data,
220
                            int *got_frame_ptr, AVPacket *avpkt)
221
{
222
40
    AVFrame *frame     = data;
223
40
    ThreadFrame tframe = { .f = data };
224
40
    const uint8_t *buf = avpkt->data;
225
40
    int buf_size = avpkt->size;
226
40
    TTAContext *s = avctx->priv_data;
227
    GetBitContext gb;
228
    int i, ret;
229
40
    int cur_chan = 0, framelen = s->frame_length;
230
    uint32_t *p;
231
232
40
    if (avctx->err_recognition & AV_EF_CRCCHECK) {
233
        if (buf_size < 4 ||
234
            (tta_check_crc(s, buf, buf_size - 4) && avctx->err_recognition & AV_EF_EXPLODE))
235
            return AVERROR_INVALIDDATA;
236
    }
237
238
40
    if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
239
        return ret;
240
241
    /* get output buffer */
242
40
    frame->nb_samples = framelen;
243
40
    if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
244
        return ret;
245
246
    // decode directly to output buffer for 24-bit sample format
247
40
    if (s->bps == 3)
248
        s->decode_buffer = (int32_t *)frame->data[0];
249
250
    // init per channel states
251
118
    for (i = 0; i < s->channels; i++) {
252
78
        TTAFilter *filter = &s->ch_ctx[i].filter;
253
78
        s->ch_ctx[i].predictor = 0;
254
78
        ff_tta_filter_init(filter, ff_tta_filter_configs[s->bps-1]);
255
78
        if (s->format == FORMAT_ENCRYPTED) {
256
            int i;
257
144
            for (i = 0; i < 8; i++)
258
128
                filter->qm[i] = sign_extend(s->crc_pass[i], 8);
259
        }
260
78
        ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10);
261
    }
262
263
40
    i = 0;
264
3367302
    for (p = s->decode_buffer; (int32_t*)p < s->decode_buffer + (framelen * s->channels); p++) {
265
3367268
        int32_t *predictor = &s->ch_ctx[cur_chan].predictor;
266
3367268
        TTAFilter *filter = &s->ch_ctx[cur_chan].filter;
267
3367268
        TTARice *rice = &s->ch_ctx[cur_chan].rice;
268
        uint32_t unary, depth, k;
269
        int32_t value;
270
271
3367268
        unary = get_unary(&gb, 0, get_bits_left(&gb));
272
273
3367268
        if (unary == 0) {
274
1554651
            depth = 0;
275
1554651
            k = rice->k0;
276
        } else {
277
1812617
            depth = 1;
278
1812617
            k = rice->k1;
279
1812617
            unary--;
280
        }
281
282
3367268
        if (get_bits_left(&gb) < k) {
283
            ret = AVERROR_INVALIDDATA;
284
            goto error;
285
        }
286
287
3367268
        if (k) {
288

3211598
            if (k > MIN_CACHE_BITS || unary > INT32_MAX >> k) {
289
                ret = AVERROR_INVALIDDATA;
290
                goto error;
291
            }
292
3211598
            value = (unary << k) + get_bits(&gb, k);
293
        } else
294
155670
            value = unary;
295
296
        // FIXME: copy paste from original
297
3367268
        switch (depth) {
298
1812617
        case 1:
299
1812617
            rice->sum1 += value - (rice->sum1 >> 4);
300

1812617
            if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1])
301
49342
                rice->k1--;
302
1763275
            else if(rice->sum1 > ff_tta_shift_16[rice->k1 + 1])
303
49047
                rice->k1++;
304
1812617
            value += ff_tta_shift_1[rice->k0];
305
3367268
        default:
306
3367268
            rice->sum0 += value - (rice->sum0 >> 4);
307

3367268
            if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0])
308
92975
                rice->k0--;
309
3274293
            else if(rice->sum0 > ff_tta_shift_16[rice->k0 + 1])
310
92683
                rice->k0++;
311
        }
312
313
        // extract coded value
314
3367268
        *p = 1 + ((value >> 1) ^ ((value & 1) - 1));
315
316
        // run hybrid filter
317
3367268
        s->dsp.filter_process(filter->qm, filter->dx, filter->dl, &filter->error, p,
318
                              filter->shift, filter->round);
319
320
        // fixed order prediction
321
#define PRED(x, k) (int32_t)((((uint64_t)(x) << (k)) - (x)) >> (k))
322

3367268
        switch (s->bps) {
323
        case 1: *p += PRED(*predictor, 4); break;
324
3367268
        case 2:
325
3367268
        case 3: *p += PRED(*predictor, 5); break;
326
        case 4: *p +=      *predictor;     break;
327
        }
328
3367268
        *predictor = *p;
329
330
        // flip channels
331
3367268
        if (cur_chan < (s->channels-1))
332
1639534
            cur_chan++;
333
        else {
334
            // decorrelate in case of multiple channels
335
1727734
            if (s->channels > 1) {
336
1639534
                int32_t *r = p - 1;
337
3279068
                for (*p += *r / 2; r > (int32_t*)p - s->channels; r--)
338
1639534
                    *r = *(r + 1) - *r;
339
            }
340
1727734
            cur_chan = 0;
341
1727734
            i++;
342
            // check for last frame
343

1727734
            if (i == s->last_frame_length && get_bits_left(&gb) / 8 == 4) {
344
6
                frame->nb_samples = framelen = s->last_frame_length;
345
6
                break;
346
            }
347
        }
348
    }
349
350
40
    align_get_bits(&gb);
351
40
    if (get_bits_left(&gb) < 32) {
352
        ret = AVERROR_INVALIDDATA;
353
        goto error;
354
    }
355
40
    skip_bits_long(&gb, 32); // frame crc
356
357
    // convert to output buffer
358

40
    switch (s->bps) {
359
    case 1: {
360
        uint8_t *samples = (uint8_t *)frame->data[0];
361
        for (p = s->decode_buffer; (int32_t*)p < s->decode_buffer + (framelen * s->channels); p++)
362
            *samples++ = *p + 0x80;
363
        break;
364
        }
365
40
    case 2: {
366
40
        int16_t *samples = (int16_t *)frame->data[0];
367
3367308
        for (p = s->decode_buffer; (int32_t*)p < s->decode_buffer + (framelen * s->channels); p++)
368
3367268
            *samples++ = *p;
369
40
        break;
370
        }
371
    case 3: {
372
        // shift samples for 24-bit sample format
373
        int32_t *samples = (int32_t *)frame->data[0];
374
        for (i = 0; i < framelen * s->channels; i++)
375
            *samples++ *= 256;
376
        // reset decode buffer
377
        s->decode_buffer = NULL;
378
        break;
379
        }
380
    }
381
382
40
    *got_frame_ptr = 1;
383
384
40
    return buf_size;
385
error:
386
    // reset decode buffer
387
    if (s->bps == 3)
388
        s->decode_buffer = NULL;
389
    return ret;
390
}
391
392
20
static av_cold int tta_decode_close(AVCodecContext *avctx) {
393
20
    TTAContext *s = avctx->priv_data;
394
395
20
    if (s->bps < 3)
396
20
        av_freep(&s->decode_buffer);
397
20
    s->decode_buffer = NULL;
398
20
    av_freep(&s->ch_ctx);
399
400
20
    return 0;
401
}
402
403
#define OFFSET(x) offsetof(TTAContext, x)
404
#define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
405
static const AVOption options[] = {
406
    { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
407
    { NULL },
408
};
409
410
static const AVClass tta_decoder_class = {
411
    .class_name = "TTA Decoder",
412
    .item_name  = av_default_item_name,
413
    .option     = options,
414
    .version    = LIBAVUTIL_VERSION_INT,
415
};
416
417
AVCodec ff_tta_decoder = {
418
    .name           = "tta",
419
    .long_name      = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
420
    .type           = AVMEDIA_TYPE_AUDIO,
421
    .id             = AV_CODEC_ID_TTA,
422
    .priv_data_size = sizeof(TTAContext),
423
    .init           = tta_decode_init,
424
    .close          = tta_decode_close,
425
    .decode         = tta_decode_frame,
426
    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
427
    .priv_class     = &tta_decoder_class,
428
};