LCOV - code coverage report
Current view: top level - libavcodec - ac3dec_fixed.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 40 65 61.5 %
Date: 2017-12-12 11:08:38 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2012
       3             :  *      MIPS Technologies, Inc., California.
       4             :  *
       5             :  * Redistribution and use in source and binary forms, with or without
       6             :  * modification, are permitted provided that the following conditions
       7             :  * are met:
       8             :  * 1. Redistributions of source code must retain the above copyright
       9             :  *    notice, this list of conditions and the following disclaimer.
      10             :  * 2. Redistributions in binary form must reproduce the above copyright
      11             :  *    notice, this list of conditions and the following disclaimer in the
      12             :  *    documentation and/or other materials provided with the distribution.
      13             :  * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
      14             :  *    contributors may be used to endorse or promote products derived from
      15             :  *    this software without specific prior written permission.
      16             :  *
      17             :  * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
      18             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      19             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      20             :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
      21             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      22             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      23             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      24             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      25             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      26             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      27             :  * SUCH DAMAGE.
      28             :  *
      29             :  * Author:  Stanislav Ocovaj (socovaj@mips.com)
      30             :  *
      31             :  * AC3 fixed-point decoder for MIPS platforms
      32             :  *
      33             :  * This file is part of FFmpeg.
      34             :  *
      35             :  * FFmpeg is free software; you can redistribute it and/or
      36             :  * modify it under the terms of the GNU Lesser General Public
      37             :  * License as published by the Free Software Foundation; either
      38             :  * version 2.1 of the License, or (at your option) any later version.
      39             :  *
      40             :  * FFmpeg is distributed in the hope that it will be useful,
      41             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      42             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      43             :  * Lesser General Public License for more details.
      44             :  *
      45             :  * You should have received a copy of the GNU Lesser General Public
      46             :  * License along with FFmpeg; if not, write to the Free Software
      47             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      48             :  */
      49             : 
      50             : #define FFT_FLOAT 0
      51             : #define USE_FIXED 1
      52             : #define FFT_FIXED_32 1
      53             : #include "ac3dec.h"
      54             : 
      55             : 
      56             : static const int end_freq_inv_tab[8] =
      57             : {
      58             :     50529027, 44278013, 39403370, 32292987, 27356480, 23729101, 20951060, 18755316
      59             : };
      60             : 
      61        7008 : static void scale_coefs (
      62             :     int32_t *dst,
      63             :     const int32_t *src,
      64             :     int dynrng,
      65             :     int len)
      66             : {
      67             :     int i, shift, round;
      68             :     unsigned mul;
      69             :     int temp, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
      70             : 
      71        7008 :     mul = (dynrng & 0x1f) + 0x20;
      72        7008 :     shift = 4 - (sign_extend(dynrng, 9) >> 5);
      73        7008 :     if (shift > 0 ) {
      74        7008 :       round = 1 << (shift-1);
      75      231264 :       for (i=0; i<len; i+=8) {
      76             : 
      77      224256 :           temp = src[i] * mul;
      78      224256 :           temp1 = src[i+1] * mul;
      79      224256 :           temp = temp + round;
      80      224256 :           temp2 = src[i+2] * mul;
      81             : 
      82      224256 :           temp1 = temp1 + round;
      83      224256 :           dst[i] = temp >> shift;
      84      224256 :           temp3 = src[i+3] * mul;
      85      224256 :           temp2 = temp2 + round;
      86             : 
      87      224256 :           dst[i+1] = temp1 >> shift;
      88      224256 :           temp4 = src[i + 4] * mul;
      89      224256 :           temp3 = temp3 + round;
      90      224256 :           dst[i+2] = temp2 >> shift;
      91             : 
      92      224256 :           temp5 = src[i+5] * mul;
      93      224256 :           temp4 = temp4 + round;
      94      224256 :           dst[i+3] = temp3 >> shift;
      95      224256 :           temp6 = src[i+6] * mul;
      96             : 
      97      224256 :           dst[i+4] = temp4 >> shift;
      98      224256 :           temp5 = temp5 + round;
      99      224256 :           temp7 = src[i+7] * mul;
     100      224256 :           temp6 = temp6 + round;
     101             : 
     102      224256 :           dst[i+5] = temp5 >> shift;
     103      224256 :           temp7 = temp7 + round;
     104      224256 :           dst[i+6] = temp6 >> shift;
     105      224256 :           dst[i+7] = temp7 >> shift;
     106             : 
     107             :       }
     108             :     } else {
     109           0 :       shift = -shift;
     110           0 :       for (i=0; i<len; i+=8) {
     111             : 
     112           0 :           temp = src[i] * mul;
     113           0 :           temp1 = src[i+1] * mul;
     114           0 :           temp2 = src[i+2] * mul;
     115             : 
     116           0 :           dst[i] = temp << shift;
     117           0 :           temp3 = src[i+3] * mul;
     118             : 
     119           0 :           dst[i+1] = temp1 << shift;
     120           0 :           temp4 = src[i + 4] * mul;
     121           0 :           dst[i+2] = temp2 << shift;
     122             : 
     123           0 :           temp5 = src[i+5] * mul;
     124           0 :           dst[i+3] = temp3 << shift;
     125           0 :           temp6 = src[i+6] * mul;
     126             : 
     127           0 :           dst[i+4] = temp4 << shift;
     128           0 :           temp7 = src[i+7] * mul;
     129             : 
     130           0 :           dst[i+5] = temp5 << shift;
     131           0 :           dst[i+6] = temp6 << shift;
     132           0 :           dst[i+7] = temp7 << shift;
     133             : 
     134             :       }
     135             :     }
     136        7008 : }
     137             : 
     138             : /**
     139             :  * Downmix samples from original signal to stereo or mono (this is for 16-bit samples
     140             :  * and fixed point decoder - original (for 32-bit samples) is in ac3dsp.c).
     141             :  */
     142           1 : static void ac3_downmix_c_fixed16(int16_t **samples, int16_t **matrix,
     143             :                                   int out_ch, int in_ch, int len)
     144             : {
     145             :     int i, j;
     146             :     int v0, v1;
     147           1 :     if (out_ch == 2) {
     148           0 :         for (i = 0; i < len; i++) {
     149           0 :             v0 = v1 = 0;
     150           0 :             for (j = 0; j < in_ch; j++) {
     151           0 :                 v0 += samples[j][i] * matrix[0][j];
     152           0 :                 v1 += samples[j][i] * matrix[1][j];
     153             :             }
     154           0 :             samples[0][i] = (v0+2048)>>12;
     155           0 :             samples[1][i] = (v1+2048)>>12;
     156             :         }
     157           1 :     } else if (out_ch == 1) {
     158         257 :         for (i = 0; i < len; i++) {
     159         256 :             v0 = 0;
     160        1280 :             for (j = 0; j < in_ch; j++)
     161        1024 :                 v0 += samples[j][i] * matrix[0][j];
     162         256 :             samples[0][i] = (v0+2048)>>12;
     163             :         }
     164             :     }
     165           1 : }
     166             : 
     167             : #include "eac3dec.c"
     168             : #include "ac3dec.c"
     169             : 
     170             : static const AVOption options[] = {
     171             :     { "cons_noisegen", "enable consistent noise generation", OFFSET(consistent_noise_generation), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR },
     172             :     { "drc_scale", "percentage of dynamic range compression to apply", OFFSET(drc_scale), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 6.0, PAR },
     173             :     { "heavy_compr", "enable heavy dynamic range compression", OFFSET(heavy_compression), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR },
     174             :     { NULL},
     175             : };
     176             : 
     177             : static const AVClass ac3_decoder_class = {
     178             :     .class_name = "Fixed-Point AC-3 Decoder",
     179             :     .item_name  = av_default_item_name,
     180             :     .option     = options,
     181             :     .version    = LIBAVUTIL_VERSION_INT,
     182             : };
     183             : 
     184             : AVCodec ff_ac3_fixed_decoder = {
     185             :     .name           = "ac3_fixed",
     186             :     .type           = AVMEDIA_TYPE_AUDIO,
     187             :     .id             = AV_CODEC_ID_AC3,
     188             :     .priv_data_size = sizeof (AC3DecodeContext),
     189             :     .init           = ac3_decode_init,
     190             :     .close          = ac3_decode_end,
     191             :     .decode         = ac3_decode_frame,
     192             :     .capabilities   = AV_CODEC_CAP_DR1,
     193             :     .long_name      = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
     194             :     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
     195             :                                                       AV_SAMPLE_FMT_NONE },
     196             :     .priv_class     = &ac3_decoder_class,
     197             : };

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