/*

  * DCA compatible decoder data

  * Copyright (C) 2004 Gildas Bazin
  * Copyright (C) 2004 Benjamin Zores
  * Copyright (C) 2006 Benjamin Larsson
  * Copyright (C) 2007 Konstantin Shishkov
  *
  * 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
  */
 

 #include <stdint.h>

 #include <string.h>

 #include "libavutil/error.h"
 

 #include "dca.h"

 #include "dca_core.h"

 #include "dca_syncwords.h"

 #include "get_bits.h"

 #include "put_bits.h"

 const uint32_t avpriv_dca_sample_rates[16] = {

     0, 8000, 16000, 32000, 0, 0, 11025, 22050, 44100, 0, 0,
     12000, 24000, 48000, 96000, 192000

 };

 const uint32_t ff_dca_sampling_freqs[16] = {
       8000,  16000, 32000, 64000, 128000, 22050,  44100,  88200,
     176400, 352800, 12000, 24000,  48000, 96000, 192000, 384000,
 };
 
 const uint8_t ff_dca_freq_ranges[16] = {
     0, 1, 2, 3, 4, 1, 2, 3, 4, 4, 0, 1, 2, 3, 4, 4
 };
 

 const uint8_t ff_dca_bits_per_sample[8] = {
     16, 16, 20, 20, 0, 24, 24, 0
 };
 

 int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,

                              int max_size)
 {
     uint32_t mrk;
     int i, tmp;
     PutBitContext pb;
 
     if ((unsigned) src_size > (unsigned) max_size)
         src_size = max_size;
 
     mrk = AV_RB32(src);
     switch (mrk) {

     case DCA_SYNCWORD_CORE_BE:

     case DCA_SYNCWORD_SUBSTREAM:

         memcpy(dst, src, src_size);
         return src_size;

     case DCA_SYNCWORD_CORE_LE:

         for (i = 0; i < (src_size + 1) >> 1; i++) {
             AV_WB16(dst, AV_RL16(src));
             src += 2;
             dst += 2;
         }

         return src_size;

     case DCA_SYNCWORD_CORE_14B_BE:
     case DCA_SYNCWORD_CORE_14B_LE:

         init_put_bits(&pb, dst, max_size);
         for (i = 0; i < (src_size + 1) >> 1; i++, src += 2) {

             tmp = ((mrk == DCA_SYNCWORD_CORE_14B_BE) ? AV_RB16(src) : AV_RL16(src)) & 0x3FFF;

             put_bits(&pb, 14, tmp);
         }
         flush_put_bits(&pb);
         return (put_bits_count(&pb) + 7) >> 3;
     default:
         return AVERROR_INVALIDDATA;
     }
 }

 int ff_dca_parse_core_frame_header(DCACoreFrameHeader *h, GetBitContext *gb)

 {
     if (get_bits_long(gb, 32) != DCA_SYNCWORD_CORE_BE)
         return DCA_PARSE_ERROR_SYNC_WORD;
 
     h->normal_frame = get_bits1(gb);
     h->deficit_samples = get_bits(gb, 5) + 1;
     if (h->deficit_samples != DCA_PCMBLOCK_SAMPLES)
         return DCA_PARSE_ERROR_DEFICIT_SAMPLES;
 
     h->crc_present = get_bits1(gb);
     h->npcmblocks = get_bits(gb, 7) + 1;
     if (h->npcmblocks & (DCA_SUBBAND_SAMPLES - 1))
         return DCA_PARSE_ERROR_PCM_BLOCKS;
 
     h->frame_size = get_bits(gb, 14) + 1;
     if (h->frame_size < 96)
         return DCA_PARSE_ERROR_FRAME_SIZE;
 
     h->audio_mode = get_bits(gb, 6);
     if (h->audio_mode >= DCA_AMODE_COUNT)
         return DCA_PARSE_ERROR_AMODE;
 
     h->sr_code = get_bits(gb, 4);
     if (!avpriv_dca_sample_rates[h->sr_code])
         return DCA_PARSE_ERROR_SAMPLE_RATE;
 
     h->br_code = get_bits(gb, 5);
     if (get_bits1(gb))
         return DCA_PARSE_ERROR_RESERVED_BIT;
 
     h->drc_present = get_bits1(gb);
     h->ts_present = get_bits1(gb);
     h->aux_present = get_bits1(gb);
     h->hdcd_master = get_bits1(gb);
     h->ext_audio_type = get_bits(gb, 3);
     h->ext_audio_present = get_bits1(gb);
     h->sync_ssf = get_bits1(gb);
     h->lfe_present = get_bits(gb, 2);
     if (h->lfe_present == DCA_LFE_FLAG_INVALID)
         return DCA_PARSE_ERROR_LFE_FLAG;
 
     h->predictor_history = get_bits1(gb);
     if (h->crc_present)
         skip_bits(gb, 16);
     h->filter_perfect = get_bits1(gb);
     h->encoder_rev = get_bits(gb, 4);
     h->copy_hist = get_bits(gb, 2);
     h->pcmr_code = get_bits(gb, 3);
     if (!ff_dca_bits_per_sample[h->pcmr_code])
         return DCA_PARSE_ERROR_PCM_RES;
 
     h->sumdiff_front = get_bits1(gb);
     h->sumdiff_surround = get_bits1(gb);
     h->dn_code = get_bits(gb, 4);
     return 0;
 }

 
 int avpriv_dca_parse_core_frame_header(DCACoreFrameHeader *h, uint8_t *buf, int size)
 {
     GetBitContext gb;
 
     if (init_get_bits8(&gb, buf, size) < 0)
         return DCA_PARSE_ERROR_INVALIDDATA;
 
     return ff_dca_parse_core_frame_header(h, &gb);
 }