1 /*
2 * Copyright (C) 2016 foo86
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVCODEC_DCADEC_H
22 #define AVCODEC_DCADEC_H
23
24 #include <stdint.h>
25
26 #include "libavutil/crc.h"
27 #include "libavutil/float_dsp.h"
28 #include "libavutil/log.h"
29
30 #include "avcodec.h"
31 #include "get_bits.h"
32 #include "dca.h"
33 #include "dcadsp.h"
34 #include "dca_core.h"
35 #include "dca_exss.h"
36 #include "dca_xll.h"
37 #include "dca_lbr.h"
38
39 #define DCA_PACKET_CORE 0x01
40 #define DCA_PACKET_EXSS 0x02
41 #define DCA_PACKET_XLL 0x04
42 #define DCA_PACKET_LBR 0x08
43 #define DCA_PACKET_MASK 0x0f
44
45 #define DCA_PACKET_RECOVERY 0x10 ///< Sync error recovery flag
46 #define DCA_PACKET_RESIDUAL 0x20 ///< Core valid for residual decoding
47
48 enum DCAOutputChannelOrder {
49 CHANNEL_ORDER_DEFAULT,
50 CHANNEL_ORDER_CODED,
51 };
52
53 typedef struct DCAContext {
54 const AVClass *class; ///< class for AVOptions
55 AVCodecContext *avctx;
56
57 DCACoreDecoder core; ///< Core decoder context
58 DCAExssParser exss; ///< EXSS parser context
59 DCAXllDecoder xll; ///< XLL decoder context
60 DCALbrDecoder lbr; ///< LBR decoder context
61
62 DCADSPContext dcadsp;
63
64 const AVCRC *crctab;
65
66 uint8_t *buffer; ///< Packet buffer
67 unsigned int buffer_size;
68
69 int packet; ///< Packet flags
70
71 int request_channel_layout; ///< Converted from avctx.request_channel_layout
72 int core_only; ///< Core only decoding flag
73 int output_channel_order;
74 AVChannelLayout downmix_layout;
75 } DCAContext;
76
77 int ff_dca_set_channel_layout(AVCodecContext *avctx, int *ch_remap, int dca_mask);
78
79 void ff_dca_downmix_to_stereo_fixed(DCADSPContext *dcadsp, int32_t **samples,
80 int *coeff_l, int nsamples, int ch_mask);
81 void ff_dca_downmix_to_stereo_float(AVFloatDSPContext *fdsp, float **samples,
82 int *coeff_l, int nsamples, int ch_mask);
83
ff_dca_check_crc(AVCodecContext * avctx,GetBitContext * s,int p1,int p2)84 static inline int ff_dca_check_crc(AVCodecContext *avctx, GetBitContext *s,
85 int p1, int p2)
86 {
87 DCAContext *dca = avctx->priv_data;
88
89 if (!(avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_CAREFUL)))
90 return 0;
91 if (((p1 | p2) & 7) || p1 < 0 || p2 > s->size_in_bits || p2 - p1 < 16)
92 return -1;
93 if (av_crc(dca->crctab, 0xffff, s->buffer + p1 / 8, (p2 - p1) / 8))
94 return -1;
95 return 0;
96 }
97
ff_dca_seek_bits(GetBitContext * s,int p)98 static inline int ff_dca_seek_bits(GetBitContext *s, int p)
99 {
100 if (p < get_bits_count(s) || p > s->size_in_bits)
101 return -1;
102 skip_bits_long(s, p - get_bits_count(s));
103 return 0;
104 }
105
106 #endif
107