/*
  * Copyright (c) 2012
  *      MIPS Technologies, Inc., California.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
  *    contributors may be used to endorse or promote products derived from
  *    this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
  * Author:  Stanislav Ocovaj (socovaj@mips.com)
  *
  * AC3 fixed-point decoder for MIPS platforms
  *
  * 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
  */
 
 #define FFT_FLOAT 0

 #define USE_FIXED 1

 #define FFT_FIXED_32 1
 #include "ac3dec.h"
 
 

 static const int end_freq_inv_tab[8] =

 {
     50529027, 44278013, 39403370, 32292987, 27356480, 23729101, 20951060, 18755316
 };
 
 static void scale_coefs (
     int32_t *dst,
     const int32_t *src,
     int dynrng,
     int len)
 {
     int i, shift, round;
     int16_t mul;
     int temp, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
 
     mul = (dynrng & 0x1f) + 0x20;

     shift = 4 - ((dynrng << 23) >> 28);
     if (shift > 0 ) {
       round = 1 << (shift-1);
       for (i=0; i<len; i+=8) {
 
           temp = src[i] * mul;
           temp1 = src[i+1] * mul;
           temp = temp + round;
           temp2 = src[i+2] * mul;
 
           temp1 = temp1 + round;
           dst[i] = temp >> shift;
           temp3 = src[i+3] * mul;
           temp2 = temp2 + round;
 
           dst[i+1] = temp1 >> shift;
           temp4 = src[i + 4] * mul;
           temp3 = temp3 + round;
           dst[i+2] = temp2 >> shift;
 
           temp5 = src[i+5] * mul;
           temp4 = temp4 + round;
           dst[i+3] = temp3 >> shift;
           temp6 = src[i+6] * mul;
 
           dst[i+4] = temp4 >> shift;
           temp5 = temp5 + round;
           temp7 = src[i+7] * mul;
           temp6 = temp6 + round;
 
           dst[i+5] = temp5 >> shift;
           temp7 = temp7 + round;
           dst[i+6] = temp6 >> shift;
           dst[i+7] = temp7 >> shift;
 
       }
     } else {
       shift = -shift;
       for (i=0; i<len; i+=8) {
 
           temp = src[i] * mul;
           temp1 = src[i+1] * mul;
           temp2 = src[i+2] * mul;
 
           dst[i] = temp << shift;
           temp3 = src[i+3] * mul;
 
           dst[i+1] = temp1 << shift;
           temp4 = src[i + 4] * mul;
           dst[i+2] = temp2 << shift;
 
           temp5 = src[i+5] * mul;
           dst[i+3] = temp3 << shift;
           temp6 = src[i+6] * mul;
 
           dst[i+4] = temp4 << shift;
           temp7 = src[i+7] * mul;
 
           dst[i+5] = temp5 << shift;
           dst[i+6] = temp6 << shift;
           dst[i+7] = temp7 << shift;
 
       }

     }
 }
 
 /**
  * Downmix samples from original signal to stereo or mono (this is for 16-bit samples
  * and fixed point decoder - original (for 32-bit samples) is in ac3dsp.c).
  */
 static void ac3_downmix_c_fixed16(int16_t **samples, int16_t (*matrix)[2],
                                   int out_ch, int in_ch, int len)
 {
     int i, j;
     int v0, v1;
     if (out_ch == 2) {
         for (i = 0; i < len; i++) {
             v0 = v1 = 0;
             for (j = 0; j < in_ch; j++) {
                 v0 += samples[j][i] * matrix[j][0];
                 v1 += samples[j][i] * matrix[j][1];
             }
             samples[0][i] = (v0+2048)>>12;
             samples[1][i] = (v1+2048)>>12;
         }
     } else if (out_ch == 1) {
         for (i = 0; i < len; i++) {
             v0 = 0;
             for (j = 0; j < in_ch; j++)
                 v0 += samples[j][i] * matrix[j][0];
             samples[0][i] = (v0+2048)>>12;
         }
     }
 }
 

 #include "eac3dec.c"

 #include "ac3dec.c"
 
 static const AVOption options[] = {

     { "drc_scale", "percentage of dynamic range compression to apply", OFFSET(drc_scale), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 6.0, PAR },

     { "heavy_compr", "enable heavy dynamic range compression", OFFSET(heavy_compression), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR },

     { NULL},
 };
 
 static const AVClass ac3_decoder_class = {
     .class_name = "Fixed-Point AC-3 Decoder",
     .item_name  = av_default_item_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 
 AVCodec ff_ac3_fixed_decoder = {
     .name           = "ac3_fixed",
     .type           = AVMEDIA_TYPE_AUDIO,

     .id             = AV_CODEC_ID_AC3,

     .priv_data_size = sizeof (AC3DecodeContext),
     .init           = ac3_decode_init,
     .close          = ac3_decode_end,
     .decode         = ac3_decode_frame,

     .capabilities   = AV_CODEC_CAP_DR1,

     .long_name      = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
                                                       AV_SAMPLE_FMT_NONE },
     .priv_class     = &ac3_decoder_class,
 };