/* * 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;    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;      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,                                  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;        }    }} #include "eac3dec.c"#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 },    { 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,};