libavcodec/dcadec.h

   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
  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
  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