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7b05b5093e
The AC3DecodeContext has a float (USE_FIXED=0) and an integer (USE_FIXED=1) variant, both of which can be present in the same binary. This is not only very confusing, but it also breaks horribly, when one variant is used by code expecting the other. This currently happens, because eac3dec.c is only compiled for the float variant, but also used from ac3dec_fixed.c, which uses the integer variant. The result is memory corruption, leading to crashes. So compile eac3dec.c once for each variant and adapt it, so that it works with the integer variant. A loss of precission and scaling bug has been fixed by the committer Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
197 lines
6.5 KiB
C
197 lines
6.5 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 "eac3dec.c"
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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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