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187 lines
6.6 KiB
187 lines
6.6 KiB
/* |
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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 USE_FIXED 1 |
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#include "ac3dec.h" |
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#include "codec_internal.h" |
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#define IMDCT_TYPE AV_TX_INT32_MDCT |
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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; |
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unsigned mul, round; |
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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 - (sign_extend(dynrng, 9) >> 5); |
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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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mul <<= shift; |
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for (i=0; i<len; i+=8) { |
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dst[i] = src[i ] * mul; |
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dst[i+1] = src[i+1] * mul; |
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dst[i+2] = src[i+2] * mul; |
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dst[i+3] = src[i+3] * mul; |
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dst[i+4] = src[i+4] * mul; |
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dst[i+5] = src[i+5] * mul; |
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dst[i+6] = src[i+6] * mul; |
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dst[i+7] = src[i+7] * mul; |
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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, |
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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[0][j]; |
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v1 += samples[j][i] * matrix[1][j]; |
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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[0][j]; |
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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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{ "cons_noisegen", "enable consistent noise generation", OFFSET(consistent_noise_generation), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR }, |
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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", "enable heavy dynamic range compression", OFFSET(heavy_compression), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR }, |
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{ "downmix", "Request a specific channel layout from the decoder", OFFSET(downmix_layout), AV_OPT_TYPE_CHLAYOUT, {.str = NULL}, .flags = 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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.option = options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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const FFCodec ff_ac3_fixed_decoder = { |
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.p.name = "ac3_fixed", |
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CODEC_LONG_NAME("ATSC A/52A (AC-3)"), |
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.p.type = AVMEDIA_TYPE_AUDIO, |
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.p.id = AV_CODEC_ID_AC3, |
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.p.priv_class = &ac3_decoder_class, |
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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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FF_CODEC_DECODE_CB(ac3_decode_frame), |
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.p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | |
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AV_CODEC_CAP_DR1, |
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.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
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AV_SAMPLE_FMT_NONE }, |
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.caps_internal = FF_CODEC_CAP_INIT_CLEANUP, |
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};
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