196 lines
6.4 KiB
C
196 lines
6.4 KiB
C
/*
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* Copyright (c) 2012
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* MIPS Technologies, Inc., California.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Author: Stanislav Ocovaj (socovaj@mips.com)
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*
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* AC3 fixed-point decoder for MIPS platforms
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#define FFT_FLOAT 0
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#define USE_FIXED 1
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#define FFT_FIXED_32 1
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#include "ac3dec.h"
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static const int end_freq_inv_tab[8] =
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{
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50529027, 44278013, 39403370, 32292987, 27356480, 23729101, 20951060, 18755316
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};
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static void scale_coefs (
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int32_t *dst,
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const int32_t *src,
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int dynrng,
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int len)
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{
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int i, shift, round;
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int16_t mul;
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int temp, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
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mul = (dynrng & 0x1f) + 0x20;
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shift = 4 - ((dynrng << 23) >> 28);
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if (shift > 0 ) {
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round = 1 << (shift-1);
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for (i=0; i<len; i+=8) {
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temp = src[i] * mul;
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temp1 = src[i+1] * mul;
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temp = temp + round;
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temp2 = src[i+2] * mul;
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temp1 = temp1 + round;
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dst[i] = temp >> shift;
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temp3 = src[i+3] * mul;
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temp2 = temp2 + round;
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dst[i+1] = temp1 >> shift;
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temp4 = src[i + 4] * mul;
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temp3 = temp3 + round;
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dst[i+2] = temp2 >> shift;
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temp5 = src[i+5] * mul;
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temp4 = temp4 + round;
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dst[i+3] = temp3 >> shift;
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temp6 = src[i+6] * mul;
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dst[i+4] = temp4 >> shift;
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temp5 = temp5 + round;
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temp7 = src[i+7] * mul;
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temp6 = temp6 + round;
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dst[i+5] = temp5 >> shift;
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temp7 = temp7 + round;
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dst[i+6] = temp6 >> shift;
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dst[i+7] = temp7 >> shift;
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}
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} else {
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shift = -shift;
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for (i=0; i<len; i+=8) {
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temp = src[i] * mul;
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temp1 = src[i+1] * mul;
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temp2 = src[i+2] * mul;
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dst[i] = temp << shift;
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temp3 = src[i+3] * mul;
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dst[i+1] = temp1 << shift;
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temp4 = src[i + 4] * mul;
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dst[i+2] = temp2 << shift;
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temp5 = src[i+5] * mul;
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dst[i+3] = temp3 << shift;
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temp6 = src[i+6] * mul;
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dst[i+4] = temp4 << shift;
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temp7 = src[i+7] * mul;
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dst[i+5] = temp5 << shift;
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dst[i+6] = temp6 << shift;
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dst[i+7] = temp7 << shift;
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}
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}
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}
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/**
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* Downmix samples from original signal to stereo or mono (this is for 16-bit samples
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* and fixed point decoder - original (for 32-bit samples) is in ac3dsp.c).
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*/
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static void ac3_downmix_c_fixed16(int16_t **samples, int16_t (*matrix)[2],
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int out_ch, int in_ch, int len)
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{
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int i, j;
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int v0, v1;
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if (out_ch == 2) {
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for (i = 0; i < len; i++) {
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v0 = v1 = 0;
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for (j = 0; j < in_ch; j++) {
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v0 += samples[j][i] * matrix[j][0];
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v1 += samples[j][i] * matrix[j][1];
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}
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samples[0][i] = (v0+2048)>>12;
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samples[1][i] = (v1+2048)>>12;
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}
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} else if (out_ch == 1) {
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for (i = 0; i < len; i++) {
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v0 = 0;
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for (j = 0; j < in_ch; j++)
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v0 += samples[j][i] * matrix[j][0];
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samples[0][i] = (v0+2048)>>12;
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}
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}
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}
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#include "ac3dec.c"
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static const AVOption options[] = {
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{ "drc_scale", "percentage of dynamic range compression to apply", OFFSET(drc_scale), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 6.0, PAR },
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{ "heavy_compr", "heavy dynamic range compression enabled", OFFSET(heavy_compression), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, PAR },
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{ NULL},
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};
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static const AVClass ac3_decoder_class = {
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.class_name = "Fixed-Point AC-3 Decoder",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVCodec ff_ac3_fixed_decoder = {
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.name = "ac3_fixed",
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_AC3,
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.priv_data_size = sizeof (AC3DecodeContext),
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.init = ac3_decode_init,
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.close = ac3_decode_end,
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.decode = ac3_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
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AV_SAMPLE_FMT_NONE },
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.priv_class = &ac3_decoder_class,
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};
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