1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*
* DCA compatible decoder data
* Copyright (C) 2004 Gildas Bazin
* Copyright (C) 2004 Benjamin Zores
* Copyright (C) 2006 Benjamin Larsson
* Copyright (C) 2007 Konstantin Shishkov
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include <string.h>
#include "libavutil/error.h"
#include "dca.h"
#include "dca_core.h"
#include "dca_syncwords.h"
#include "get_bits.h"
#include "put_bits.h"
const uint32_t avpriv_dca_sample_rates[16] = {
0, 8000, 16000, 32000, 0, 0, 11025, 22050, 44100, 0, 0,
12000, 24000, 48000, 96000, 192000
};
const uint32_t ff_dca_sampling_freqs[16] = {
8000, 16000, 32000, 64000, 128000, 22050, 44100, 88200,
176400, 352800, 12000, 24000, 48000, 96000, 192000, 384000,
};
const uint8_t ff_dca_freq_ranges[16] = {
0, 1, 2, 3, 4, 1, 2, 3, 4, 4, 0, 1, 2, 3, 4, 4
};
const uint8_t ff_dca_bits_per_sample[8] = {
16, 16, 20, 20, 0, 24, 24, 0
};
int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
int max_size)
{
uint32_t mrk;
int i, tmp;
PutBitContext pb;
if ((unsigned) src_size > (unsigned) max_size)
src_size = max_size;
mrk = AV_RB32(src);
switch (mrk) {
case DCA_SYNCWORD_CORE_BE:
case DCA_SYNCWORD_SUBSTREAM:
memcpy(dst, src, src_size);
return src_size;
case DCA_SYNCWORD_CORE_LE:
for (i = 0; i < (src_size + 1) >> 1; i++) {
AV_WB16(dst, AV_RL16(src));
src += 2;
dst += 2;
}
return src_size;
case DCA_SYNCWORD_CORE_14B_BE:
case DCA_SYNCWORD_CORE_14B_LE:
init_put_bits(&pb, dst, max_size);
for (i = 0; i < (src_size + 1) >> 1; i++, src += 2) {
tmp = ((mrk == DCA_SYNCWORD_CORE_14B_BE) ? AV_RB16(src) : AV_RL16(src)) & 0x3FFF;
put_bits(&pb, 14, tmp);
}
flush_put_bits(&pb);
return (put_bits_count(&pb) + 7) >> 3;
default:
return AVERROR_INVALIDDATA;
}
}
int ff_dca_parse_core_frame_header(DCACoreFrameHeader *h, GetBitContext *gb)
{
if (get_bits_long(gb, 32) != DCA_SYNCWORD_CORE_BE)
return DCA_PARSE_ERROR_SYNC_WORD;
h->normal_frame = get_bits1(gb);
h->deficit_samples = get_bits(gb, 5) + 1;
if (h->deficit_samples != DCA_PCMBLOCK_SAMPLES)
return DCA_PARSE_ERROR_DEFICIT_SAMPLES;
h->crc_present = get_bits1(gb);
h->npcmblocks = get_bits(gb, 7) + 1;
if (h->npcmblocks & (DCA_SUBBAND_SAMPLES - 1))
return DCA_PARSE_ERROR_PCM_BLOCKS;
h->frame_size = get_bits(gb, 14) + 1;
if (h->frame_size < 96)
return DCA_PARSE_ERROR_FRAME_SIZE;
h->audio_mode = get_bits(gb, 6);
if (h->audio_mode >= DCA_AMODE_COUNT)
return DCA_PARSE_ERROR_AMODE;
h->sr_code = get_bits(gb, 4);
if (!avpriv_dca_sample_rates[h->sr_code])
return DCA_PARSE_ERROR_SAMPLE_RATE;
h->br_code = get_bits(gb, 5);
if (get_bits1(gb))
return DCA_PARSE_ERROR_RESERVED_BIT;
h->drc_present = get_bits1(gb);
h->ts_present = get_bits1(gb);
h->aux_present = get_bits1(gb);
h->hdcd_master = get_bits1(gb);
h->ext_audio_type = get_bits(gb, 3);
h->ext_audio_present = get_bits1(gb);
h->sync_ssf = get_bits1(gb);
h->lfe_present = get_bits(gb, 2);
if (h->lfe_present == DCA_LFE_FLAG_INVALID)
return DCA_PARSE_ERROR_LFE_FLAG;
h->predictor_history = get_bits1(gb);
if (h->crc_present)
skip_bits(gb, 16);
h->filter_perfect = get_bits1(gb);
h->encoder_rev = get_bits(gb, 4);
h->copy_hist = get_bits(gb, 2);
h->pcmr_code = get_bits(gb, 3);
if (!ff_dca_bits_per_sample[h->pcmr_code])
return DCA_PARSE_ERROR_PCM_RES;
h->sumdiff_front = get_bits1(gb);
h->sumdiff_surround = get_bits1(gb);
h->dn_code = get_bits(gb, 4);
return 0;
}
int avpriv_dca_parse_core_frame_header(DCACoreFrameHeader *h, const uint8_t *buf, int size)
{
GetBitContext gb;
if (init_get_bits8(&gb, buf, size) < 0)
return DCA_PARSE_ERROR_INVALIDDATA;
return ff_dca_parse_core_frame_header(h, &gb);
}
|
