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
33const uint32_t avpriv_dca_sample_rates[16] =
34{
35    0, 8000, 16000, 32000, 0, 0, 11025, 22050, 44100, 0, 0,
36    12000, 24000, 48000, 96000, 192000
37};
38
39int ff_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
40                             int max_size)
41{
42    uint32_t mrk;
43    int i, tmp;
44    const uint16_t *ssrc = (const uint16_t *) src;
45    uint16_t *sdst = (uint16_t *) dst;
46    PutBitContext pb;
47
48    if ((unsigned) src_size > (unsigned) max_size)
49        src_size = max_size;
50
51    mrk = AV_RB32(src);
52    switch (mrk) {
53    case DCA_MARKER_RAW_BE:
54        memcpy(dst, src, src_size);
55        return src_size;
56    case DCA_MARKER_RAW_LE:
57        for (i = 0; i < (src_size + 1) >> 1; i++)
58            *sdst++ = av_bswap16(*ssrc++);
59        return src_size;
60    case DCA_MARKER_14B_BE:
61    case DCA_MARKER_14B_LE:
62        init_put_bits(&pb, dst, max_size);
63        for (i = 0; i < (src_size + 1) >> 1; i++, src += 2) {
64            tmp = ((mrk == DCA_MARKER_14B_BE) ? AV_RB16(src) : AV_RL16(src)) & 0x3FFF;
65            put_bits(&pb, 14, tmp);
66        }
67        flush_put_bits(&pb);
68        return (put_bits_count(&pb) + 7) >> 3;
69    default:
70        return AVERROR_INVALIDDATA;
71    }
72}
73