libavcodec/ac3dec_fixed.c

   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 #include "config_components.h"
  51 #define USE_FIXED 1
  52 #include "ac3dec.h"
  53 #include "codec_internal.h"
  54 #define IMDCT_TYPE AV_TX_INT32_MDCT
  55
  56 #include "ac3dec.h"
  57
  58 static const int end_freq_inv_tab[8] =
  59 {
  60     50529027, 44278013, 39403370, 32292987, 27356480, 23729101, 20951060, 18755316
  61 };
  62
  63 static void scale_coefs (
  64     int32_t *dst,
  65     const int32_t *src,
  66     int dynrng,
  67     int len)
  68 {
  69     int i, shift;
  70     unsigned mul, round;
  71     int temp, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
  72
  73     mul = (dynrng & 0x1f) + 0x20;
  74     shift = 4 - (sign_extend(dynrng, 9) >> 5);
  75     if (shift > 0 ) {
  76       round = 1 << (shift-1);
  77       for (i=0; i<len; i+=8) {
  78
  79           temp = src[i] * mul;
  80           temp1 = src[i+1] * mul;
  81           temp = temp + round;
  82           temp2 = src[i+2] * mul;
  83
  84           temp1 = temp1 + round;
  85           dst[i] = temp >> shift;
  86           temp3 = src[i+3] * mul;
  87           temp2 = temp2 + round;
  88
  89           dst[i+1] = temp1 >> shift;
  90           temp4 = src[i + 4] * mul;
  91           temp3 = temp3 + round;
  92           dst[i+2] = temp2 >> shift;
  93
  94           temp5 = src[i+5] * mul;
  95           temp4 = temp4 + round;
  96           dst[i+3] = temp3 >> shift;
  97           temp6 = src[i+6] * mul;
  98
  99           dst[i+4] = temp4 >> shift;
 100           temp5 = temp5 + round;
 101           temp7 = src[i+7] * mul;
 102           temp6 = temp6 + round;
 103
 104           dst[i+5] = temp5 >> shift;
 105           temp7 = temp7 + round;
 106           dst[i+6] = temp6 >> shift;
 107           dst[i+7] = temp7 >> shift;
 108
 109       }
 110     } else {
 111       shift = -shift;
 112       mul <<= shift;
 113       for (i=0; i<len; i+=8) {
 114
 115           dst[i]   = src[i  ] * mul;
 116           dst[i+1] = src[i+1] * mul;
 117           dst[i+2] = src[i+2] * mul;
 118           dst[i+3] = src[i+3] * mul;
 119           dst[i+4] = src[i+4] * mul;
 120           dst[i+5] = src[i+5] * mul;
 121           dst[i+6] = src[i+6] * mul;
 122           dst[i+7] = src[i+7] * mul;
 123       }
 124     }
 125 }
 126
 127 /**
 128  * Downmix samples from original signal to stereo or mono (this is for 16-bit samples
 129  * and fixed point decoder - original (for 32-bit samples) is in ac3dsp.c).
 130  */
 131 static void ac3_downmix_c_fixed16(int16_t **samples, int16_t **matrix,
 132                                   int out_ch, int in_ch, int len)
 133 {
 134     int i, j;
 135     int v0, v1;
 136     if (out_ch == 2) {
 137         for (i = 0; i < len; i++) {
 138             v0 = v1 = 0;
 139             for (j = 0; j < in_ch; j++) {
 140                 v0 += samples[j][i] * matrix[0][j];
 141                 v1 += samples[j][i] * matrix[1][j];
 142             }
 143             samples[0][i] = (v0+2048)>>12;
 144             samples[1][i] = (v1+2048)>>12;
 145         }
 146     } else if (out_ch == 1) {
 147         for (i = 0; i < len; i++) {
 148             v0 = 0;
 149             for (j = 0; j < in_ch; j++)
 150                 v0 += samples[j][i] * matrix[0][j];
 151             samples[0][i] = (v0+2048)>>12;
 152         }
 153     }
 154 }
 155
 156 #if CONFIG_EAC3_DECODER
 157 #include "eac3dec.c"
 158 #endif
 159 #include "ac3dec.c"
 160
 161 static const AVOption options[] = {
 162     { "cons_noisegen", "enable consistent noise generation", OFFSET(consistent_noise_generation), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR },
 163     { "drc_scale", "percentage of dynamic range compression to apply", OFFSET(drc_scale), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 6.0, PAR },
 164     { "heavy_compr", "enable heavy dynamic range compression", OFFSET(heavy_compression), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR },
 165     { "downmix", "Request a specific channel layout from the decoder", OFFSET(downmix_layout), AV_OPT_TYPE_CHLAYOUT, {.str = NULL}, .flags = PAR },
 166     { NULL},
 167 };
 168
 169 static const AVClass ac3_decoder_class = {
 170     .class_name = "Fixed-Point AC-3 Decoder",
 171     .item_name  = av_default_item_name,
 172     .option     = options,
 173     .version    = LIBAVUTIL_VERSION_INT,
 174 };
 175
 176 const FFCodec ff_ac3_fixed_decoder = {
 177     .p.name         = "ac3_fixed",
 178     CODEC_LONG_NAME("ATSC A/52A (AC-3)"),
 179     .p.type         = AVMEDIA_TYPE_AUDIO,
 180     .p.id           = AV_CODEC_ID_AC3,
 181     .p.priv_class   = &ac3_decoder_class,
 182     .priv_data_size = sizeof (AC3DecodeContext),
 183     .init           = ac3_decode_init,
 184     .close          = ac3_decode_end,
 185     FF_CODEC_DECODE_CB(ac3_decode_frame),
 186     .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
 187                       AV_CODEC_CAP_DR1,
 188     .p.sample_fmts  = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
 189                                                       AV_SAMPLE_FMT_NONE },
 190     .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
 191 };