/*

 * 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

 */

#include "config_components.h"

#define USE_FIXED 1

#include "ac3dec.h"

#include "codec_internal.h"

#define IMDCT_TYPE AV_TX_INT32_MDCT

#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;

    unsigned mul, round;

    int temp, temp1, temp2, temp3, temp4, temp5, temp6, temp7;

    mul = (dynrng & 0x1f) + 0x20;

    shift = 4 - (sign_extend(dynrng, 9) >> 5);

    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;

      mul <<= shift;

      for (i=0; i<len; i+=8) {

          dst[i]   = src[i  ] * mul;

          dst[i+1] = src[i+1] * mul;

          dst[i+2] = src[i+2] * mul;

          dst[i+3] = src[i+3] * mul;

          dst[i+4] = src[i+4] * mul;

          dst[i+5] = src[i+5] * mul;

          dst[i+6] = src[i+6] * mul;

          dst[i+7] = src[i+7] * mul;

      }

    }

}

/**

 * 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,

                                  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[0][j];

                v1 += samples[j][i] * matrix[1][j];

            }

            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[0][j];

            samples[0][i] = (v0+2048)>>12;

        }

    }

}

#if CONFIG_EAC3_DECODER

#include "eac3dec.c"

#endif

#include "ac3dec.c"

static const AVOption options[] = {

    { "cons_noisegen", "enable consistent noise generation", OFFSET(consistent_noise_generation), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR },

    { "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 },

    { "downmix", "Request a specific channel layout from the decoder", OFFSET(downmix_layout), AV_OPT_TYPE_CHLAYOUT, {.str = NULL}, .flags = 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,

};

const FFCodec ff_ac3_fixed_decoder = {

    .p.name         = "ac3_fixed",

    CODEC_LONG_NAME("ATSC A/52A (AC-3)"),

    .p.type         = AVMEDIA_TYPE_AUDIO,

    .p.id           = AV_CODEC_ID_AC3,

    .p.priv_class   = &ac3_decoder_class,

    .priv_data_size = sizeof (AC3DecodeContext),

    .init           = ac3_decode_init,

    .flush          = ac3_decode_flush,

    .close          = ac3_decode_end,

    FF_CODEC_DECODE_CB(ac3_decode_frame),

    .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |

                      AV_CODEC_CAP_DR1,

    CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_S16P),

    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,

};