/*
  * Copyright (C) 2016 foo86
  *
  * 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
  */
 
 #ifndef AVCODEC_DCADEC_H
 #define AVCODEC_DCADEC_H
 
 #include "libavutil/common.h"

 #include "libavutil/crc.h"

 #include "libavutil/float_dsp.h"
 
 #include "avcodec.h"
 #include "get_bits.h"
 #include "dca.h"
 #include "dcadsp.h"
 #include "dca_core.h"
 #include "dca_exss.h"
 #include "dca_xll.h"

 #include "dca_lbr.h"

 
 #define DCA_PACKET_CORE         0x01
 #define DCA_PACKET_EXSS         0x02
 #define DCA_PACKET_XLL          0x04

 #define DCA_PACKET_LBR          0x08

 #define DCA_PACKET_MASK         0x0f
 
 #define DCA_PACKET_RECOVERY     0x10    ///< Sync error recovery flag
 #define DCA_PACKET_RESIDUAL     0x20    ///< Core valid for residual decoding

 
 typedef struct DCAContext {
     const AVClass   *class;       ///< class for AVOptions
     AVCodecContext  *avctx;
 
     DCACoreDecoder core;  ///< Core decoder context
     DCAExssParser  exss;  ///< EXSS parser context
     DCAXllDecoder  xll;   ///< XLL decoder context

     DCALbrDecoder  lbr;   ///< LBR decoder context

 
     DCADSPContext   dcadsp;
 

     const AVCRC     *crctab;
 

     uint8_t         *buffer;    ///< Packet buffer
     unsigned int    buffer_size;
 
     int     packet; ///< Packet flags
 
     int     request_channel_layout; ///< Converted from avctx.request_channel_layout
     int     core_only;              ///< Core only decoding flag
 } DCAContext;
 
 int ff_dca_set_channel_layout(AVCodecContext *avctx, int *ch_remap, int dca_mask);
 
 void ff_dca_downmix_to_stereo_fixed(DCADSPContext *dcadsp, int32_t **samples,
                                     int *coeff_l, int nsamples, int ch_mask);
 void ff_dca_downmix_to_stereo_float(AVFloatDSPContext *fdsp, float **samples,
                                     int *coeff_l, int nsamples, int ch_mask);
 

 static inline int ff_dca_check_crc(AVCodecContext *avctx, GetBitContext *s,
                                    int p1, int p2)
 {
     DCAContext *dca = avctx->priv_data;
 
     if (!(avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_CAREFUL)))
         return 0;
     if (((p1 | p2) & 7) || p1 < 0 || p2 > s->size_in_bits || p2 - p1 < 16)
         return -1;
     if (av_crc(dca->crctab, 0xffff, s->buffer + p1 / 8, (p2 - p1) / 8))
         return -1;
     return 0;
 }
 

 static inline int ff_dca_seek_bits(GetBitContext *s, int p)
 {

     if (p < get_bits_count(s) || p > s->size_in_bits)

         return -1;

     skip_bits_long(s, p - get_bits_count(s));

     return 0;
 }
 
 #endif