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2ba45a60 DM |
1 | /* |
2 | * DCA compatible decoder data | |
3 | * Copyright (C) 2004 Gildas Bazin | |
4 | * Copyright (C) 2004 Benjamin Zores | |
5 | * Copyright (C) 2006 Benjamin Larsson | |
6 | * Copyright (C) 2007 Konstantin Shishkov | |
7 | * | |
8 | * This file is part of FFmpeg. | |
9 | * | |
10 | * FFmpeg is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU Lesser General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2.1 of the License, or (at your option) any later version. | |
14 | * | |
15 | * FFmpeg is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public | |
21 | * License along with FFmpeg; if not, write to the Free Software | |
22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
23 | */ | |
24 | ||
25 | #include <stdint.h> | |
26 | #include <string.h> | |
27 | ||
28 | #include "libavutil/error.h" | |
29 | ||
30 | #include "dca.h" | |
31 | #include "put_bits.h" | |
32 | ||
f6fa7814 | 33 | const uint32_t avpriv_dca_sample_rates[16] = { |
2ba45a60 DM |
34 | 0, 8000, 16000, 32000, 0, 0, 11025, 22050, 44100, 0, 0, |
35 | 12000, 24000, 48000, 96000, 192000 | |
36 | }; | |
37 | ||
38 | int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst, | |
39 | int max_size) | |
40 | { | |
41 | uint32_t mrk; | |
42 | int i, tmp; | |
43 | const uint16_t *ssrc = (const uint16_t *) src; | |
44 | uint16_t *sdst = (uint16_t *) dst; | |
45 | PutBitContext pb; | |
46 | ||
47 | if ((unsigned) src_size > (unsigned) max_size) | |
48 | src_size = max_size; | |
49 | ||
50 | mrk = AV_RB32(src); | |
51 | switch (mrk) { | |
52 | case DCA_MARKER_RAW_BE: | |
53 | memcpy(dst, src, src_size); | |
54 | return src_size; | |
55 | case DCA_MARKER_RAW_LE: | |
56 | for (i = 0; i < (src_size + 1) >> 1; i++) | |
57 | *sdst++ = av_bswap16(*ssrc++); | |
58 | return src_size; | |
59 | case DCA_MARKER_14B_BE: | |
60 | case DCA_MARKER_14B_LE: | |
61 | init_put_bits(&pb, dst, max_size); | |
62 | for (i = 0; i < (src_size + 1) >> 1; i++, src += 2) { | |
63 | tmp = ((mrk == DCA_MARKER_14B_BE) ? AV_RB16(src) : AV_RL16(src)) & 0x3FFF; | |
64 | put_bits(&pb, 14, tmp); | |
65 | } | |
66 | flush_put_bits(&pb); | |
67 | return (put_bits_count(&pb) + 7) >> 3; | |
68 | default: | |
69 | return AVERROR_INVALIDDATA; | |
70 | } | |
71 | } |