GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/binkaudio.c Lines: 137 161 85.1 %
Date: 2021-04-20 04:37:23 Branches: 76 96 79.2 %

Line Branch Exec Source
1
/*
2
 * Bink Audio decoder
3
 * Copyright (c) 2007-2011 Peter Ross (pross@xvid.org)
4
 * Copyright (c) 2009 Daniel Verkamp (daniel@drv.nu)
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
18
 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22
23
/**
24
 * @file
25
 * Bink Audio decoder
26
 *
27
 * Technical details here:
28
 *  http://wiki.multimedia.cx/index.php?title=Bink_Audio
29
 */
30
31
#include "libavutil/channel_layout.h"
32
#include "libavutil/intfloat.h"
33
#include "libavutil/mem_internal.h"
34
35
#define BITSTREAM_READER_LE
36
#include "avcodec.h"
37
#include "dct.h"
38
#include "decode.h"
39
#include "get_bits.h"
40
#include "internal.h"
41
#include "rdft.h"
42
#include "wma_freqs.h"
43
44
#define MAX_CHANNELS 2
45
#define BINK_BLOCK_MAX_SIZE (MAX_CHANNELS << 11)
46
47
typedef struct BinkAudioContext {
48
    GetBitContext gb;
49
    int version_b;          ///< Bink version 'b'
50
    int first;
51
    int channels;
52
    int frame_len;          ///< transform size (samples)
53
    int overlap_len;        ///< overlap size (samples)
54
    int block_size;
55
    int num_bands;
56
    float root;
57
    unsigned int bands[26];
58
    float previous[MAX_CHANNELS][BINK_BLOCK_MAX_SIZE / 16];  ///< coeffs from previous audio block
59
    float quant_table[96];
60
    AVPacket *pkt;
61
    union {
62
        RDFTContext rdft;
63
        DCTContext dct;
64
    } trans;
65
} BinkAudioContext;
66
67
68
6
static av_cold int decode_init(AVCodecContext *avctx)
69
{
70
6
    BinkAudioContext *s = avctx->priv_data;
71
6
    int sample_rate = avctx->sample_rate;
72
    int sample_rate_half;
73
    int i, ret;
74
    int frame_len_bits;
75
76
    /* determine frame length */
77
6
    if (avctx->sample_rate < 22050) {
78
        frame_len_bits = 9;
79
6
    } else if (avctx->sample_rate < 44100) {
80
2
        frame_len_bits = 10;
81
    } else {
82
4
        frame_len_bits = 11;
83
    }
84
85

6
    if (avctx->channels < 1 || avctx->channels > MAX_CHANNELS) {
86
        av_log(avctx, AV_LOG_ERROR, "invalid number of channels: %d\n", avctx->channels);
87
        return AVERROR_INVALIDDATA;
88
    }
89
6
    avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO :
90
                                                   AV_CH_LAYOUT_STEREO;
91
92

6
    s->version_b = avctx->extradata_size >= 4 && avctx->extradata[3] == 'b';
93
94
6
    if (avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) {
95
        // audio is already interleaved for the RDFT format variant
96
2
        avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
97
2
        if (sample_rate > INT_MAX / avctx->channels)
98
            return AVERROR_INVALIDDATA;
99
2
        sample_rate  *= avctx->channels;
100
2
        s->channels = 1;
101
2
        if (!s->version_b)
102
2
            frame_len_bits += av_log2(avctx->channels);
103
    } else {
104
4
        s->channels = avctx->channels;
105
4
        avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
106
    }
107
108
6
    s->frame_len     = 1 << frame_len_bits;
109
6
    s->overlap_len   = s->frame_len / 16;
110
6
    s->block_size    = (s->frame_len - s->overlap_len) * s->channels;
111
6
    sample_rate_half = (sample_rate + 1LL) / 2;
112
6
    if (avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT)
113
2
        s->root = 2.0 / (sqrt(s->frame_len) * 32768.0);
114
    else
115
4
        s->root = s->frame_len / (sqrt(s->frame_len) * 32768.0);
116
582
    for (i = 0; i < 96; i++) {
117
        /* constant is result of 0.066399999/log10(M_E) */
118
576
        s->quant_table[i] = expf(i * 0.15289164787221953823f) * s->root;
119
    }
120
121
    /* calculate number of bands */
122
150
    for (s->num_bands = 1; s->num_bands < 25; s->num_bands++)
123
144
        if (sample_rate_half <= ff_wma_critical_freqs[s->num_bands - 1])
124
            break;
125
126
    /* populate bands data */
127
6
    s->bands[0] = 2;
128
150
    for (i = 1; i < s->num_bands; i++)
129
144
        s->bands[i] = (ff_wma_critical_freqs[i - 1] * s->frame_len / sample_rate_half) & ~1;
130
6
    s->bands[s->num_bands] = s->frame_len;
131
132
6
    s->first = 1;
133
134
6
    if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT)
135
2
        ret = ff_rdft_init(&s->trans.rdft, frame_len_bits, DFT_C2R);
136
    else if (CONFIG_BINKAUDIO_DCT_DECODER)
137
4
        ret = ff_dct_init(&s->trans.dct, frame_len_bits, DCT_III);
138
    else
139
        av_assert0(0);
140
6
    if (ret < 0)
141
        return ret;
142
143
6
    s->pkt = av_packet_alloc();
144
6
    if (!s->pkt)
145
        return AVERROR(ENOMEM);
146
147
6
    return 0;
148
}
149
150
582
static float get_float(GetBitContext *gb)
151
{
152
582
    int power = get_bits(gb, 5);
153
582
    float f = ldexpf(get_bits(gb, 23), power - 23);
154
582
    if (get_bits1(gb))
155
314
        f = -f;
156
582
    return f;
157
}
158
159
static const uint8_t rle_length_tab[16] = {
160
    2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 64
161
};
162
163
/**
164
 * Decode Bink Audio block
165
 * @param[out] out Output buffer (must contain s->block_size elements)
166
 * @return 0 on success, negative error code on failure
167
 */
168
172
static int decode_block(BinkAudioContext *s, float **out, int use_dct)
169
{
170
    int ch, i, j, k;
171
    float q, quant[25];
172
    int width, coeff;
173
172
    GetBitContext *gb = &s->gb;
174
175
172
    if (use_dct)
176
119
        skip_bits(gb, 2);
177
178
463
    for (ch = 0; ch < s->channels; ch++) {
179
291
        FFTSample *coeffs = out[ch];
180
181
291
        if (s->version_b) {
182
            if (get_bits_left(gb) < 64)
183
                return AVERROR_INVALIDDATA;
184
            coeffs[0] = av_int2float(get_bits_long(gb, 32)) * s->root;
185
            coeffs[1] = av_int2float(get_bits_long(gb, 32)) * s->root;
186
        } else {
187
291
            if (get_bits_left(gb) < 58)
188
                return AVERROR_INVALIDDATA;
189
291
            coeffs[0] = get_float(gb) * s->root;
190
291
            coeffs[1] = get_float(gb) * s->root;
191
        }
192
193
291
        if (get_bits_left(gb) < s->num_bands * 8)
194
            return AVERROR_INVALIDDATA;
195
7566
        for (i = 0; i < s->num_bands; i++) {
196
7275
            int value = get_bits(gb, 8);
197
7275
            quant[i]  = s->quant_table[FFMIN(value, 95)];
198
        }
199
200
291
        k = 0;
201
291
        q = quant[0];
202
203
        // parse coefficients
204
291
        i = 2;
205
21612
        while (i < s->frame_len) {
206
21321
            if (s->version_b) {
207
                j = i + 16;
208
            } else {
209
21321
                int v = get_bits1(gb);
210
21321
                if (v) {
211
7766
                    v = get_bits(gb, 4);
212
7766
                    j = i + rle_length_tab[v] * 8;
213
                } else {
214
13555
                    j = i + 8;
215
                }
216
            }
217
218
21321
            j = FFMIN(j, s->frame_len);
219
220
21321
            width = get_bits(gb, 4);
221
21321
            if (width == 0) {
222
827
                memset(coeffs + i, 0, (j - i) * sizeof(*coeffs));
223
827
                i = j;
224
1089
                while (s->bands[k] < i)
225
262
                    q = quant[k++];
226
            } else {
227
371504
                while (i < j) {
228
351010
                    if (s->bands[k] == i)
229
7013
                        q = quant[k++];
230
351010
                    coeff = get_bits(gb, width);
231
351010
                    if (coeff) {
232
                        int v;
233
286706
                        v = get_bits1(gb);
234
286706
                        if (v)
235
138673
                            coeffs[i] = -q * coeff;
236
                        else
237
148033
                            coeffs[i] =  q * coeff;
238
                    } else {
239
64304
                        coeffs[i] = 0.0f;
240
                    }
241
351010
                    i++;
242
                }
243
            }
244
        }
245
246
291
        if (CONFIG_BINKAUDIO_DCT_DECODER && use_dct) {
247
238
            coeffs[0] /= 0.5;
248
238
            s->trans.dct.dct_calc(&s->trans.dct,  coeffs);
249
        }
250
        else if (CONFIG_BINKAUDIO_RDFT_DECODER)
251
53
            s->trans.rdft.rdft_calc(&s->trans.rdft, coeffs);
252
    }
253
254
463
    for (ch = 0; ch < s->channels; ch++) {
255
        int j;
256
291
        int count = s->overlap_len * s->channels;
257
291
        if (!s->first) {
258
288
            j = ch;
259
28704
            for (i = 0; i < s->overlap_len; i++, j += s->channels)
260
28416
                out[ch][i] = (s->previous[ch][i] * (count - j) +
261
28416
                                      out[ch][i] *          j) / count;
262
        }
263
291
        memcpy(s->previous[ch], &out[ch][s->frame_len - s->overlap_len],
264
291
               s->overlap_len * sizeof(*s->previous[ch]));
265
    }
266
267
172
    s->first = 0;
268
269
172
    return 0;
270
}
271
272
6
static av_cold int decode_end(AVCodecContext *avctx)
273
{
274
6
    BinkAudioContext * s = avctx->priv_data;
275
6
    if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT)
276
2
        ff_rdft_end(&s->trans.rdft);
277
    else if (CONFIG_BINKAUDIO_DCT_DECODER)
278
4
        ff_dct_end(&s->trans.dct);
279
280
6
    av_packet_free(&s->pkt);
281
282
6
    return 0;
283
}
284
285
172
static void get_bits_align32(GetBitContext *s)
286
{
287
172
    int n = (-get_bits_count(s)) & 31;
288
172
    if (n) skip_bits(s, n);
289
172
}
290
291
268
static int binkaudio_receive_frame(AVCodecContext *avctx, AVFrame *frame)
292
{
293
268
    BinkAudioContext *s = avctx->priv_data;
294
268
    GetBitContext *gb = &s->gb;
295
    int ret;
296
297
268
    if (!s->pkt->data) {
298
188
        ret = ff_decode_get_packet(avctx, s->pkt);
299
188
        if (ret < 0)
300
96
            return ret;
301
302
92
        if (s->pkt->size < 4) {
303
            av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
304
            ret = AVERROR_INVALIDDATA;
305
            goto fail;
306
        }
307
308
92
        ret = init_get_bits8(gb, s->pkt->data, s->pkt->size);
309
92
        if (ret < 0)
310
            goto fail;
311
312
        /* skip reported size */
313
92
        skip_bits_long(gb, 32);
314
    }
315
316
    /* get output buffer */
317
172
    frame->nb_samples = s->frame_len;
318
172
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
319
        return ret;
320
321
172
    if (decode_block(s, (float **)frame->extended_data,
322
172
                     avctx->codec->id == AV_CODEC_ID_BINKAUDIO_DCT)) {
323
        av_log(avctx, AV_LOG_ERROR, "Incomplete packet\n");
324
        return AVERROR_INVALIDDATA;
325
    }
326
172
    get_bits_align32(gb);
327
172
    if (!get_bits_left(gb)) {
328
92
        memset(gb, 0, sizeof(*gb));
329
92
        av_packet_unref(s->pkt);
330
    }
331
332
172
    frame->nb_samples = s->block_size / avctx->channels;
333
334
172
    return 0;
335
fail:
336
    av_packet_unref(s->pkt);
337
    return ret;
338
}
339
340
AVCodec ff_binkaudio_rdft_decoder = {
341
    .name           = "binkaudio_rdft",
342
    .long_name      = NULL_IF_CONFIG_SMALL("Bink Audio (RDFT)"),
343
    .type           = AVMEDIA_TYPE_AUDIO,
344
    .id             = AV_CODEC_ID_BINKAUDIO_RDFT,
345
    .priv_data_size = sizeof(BinkAudioContext),
346
    .init           = decode_init,
347
    .close          = decode_end,
348
    .receive_frame  = binkaudio_receive_frame,
349
    .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
350
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
351
};
352
353
AVCodec ff_binkaudio_dct_decoder = {
354
    .name           = "binkaudio_dct",
355
    .long_name      = NULL_IF_CONFIG_SMALL("Bink Audio (DCT)"),
356
    .type           = AVMEDIA_TYPE_AUDIO,
357
    .id             = AV_CODEC_ID_BINKAUDIO_DCT,
358
    .priv_data_size = sizeof(BinkAudioContext),
359
    .init           = decode_init,
360
    .close          = decode_end,
361
    .receive_frame  = binkaudio_receive_frame,
362
    .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
363
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
364
};