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https://github.com/xenia-project/FFmpeg.git
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avcodec/alacdec: split off decorrelate_stereo and append_extra_bits as alacdsp
Reviewed-by: Michael Niedermayer <michaelni@gmx.at> Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
parent
2cbaa078d1
commit
b70566d6ca
@ -143,7 +143,7 @@ OBJS-$(CONFIG_AC3_ENCODER) += ac3enc_float.o ac3enc.o ac3tab.o \
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ac3.o kbdwin.o
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OBJS-$(CONFIG_AC3_FIXED_ENCODER) += ac3enc_fixed.o ac3enc.o ac3tab.o ac3.o
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OBJS-$(CONFIG_AIC_DECODER) += aic.o
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OBJS-$(CONFIG_ALAC_DECODER) += alac.o alac_data.o
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OBJS-$(CONFIG_ALAC_DECODER) += alac.o alac_data.o alacdsp.o
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OBJS-$(CONFIG_ALAC_ENCODER) += alacenc.o alac_data.o
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OBJS-$(CONFIG_ALIAS_PIX_DECODER) += aliaspixdec.o
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OBJS-$(CONFIG_ALIAS_PIX_ENCODER) += aliaspixenc.o
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@ -57,6 +57,7 @@
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#include "unary.h"
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#include "mathops.h"
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#include "alac_data.h"
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#include "alacdsp.h"
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#define ALAC_EXTRADATA_SIZE 36
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@ -81,6 +82,8 @@ typedef struct ALACContext {
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int direct_output;
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int extra_bit_bug;
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ALACDSPContext dsp;
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} ALACContext;
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static inline unsigned int decode_scalar(GetBitContext *gb, int k, int bps)
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@ -230,35 +233,6 @@ static void lpc_prediction(int32_t *error_buffer, int32_t *buffer_out,
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}
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}
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static void decorrelate_stereo(int32_t *buffer[2], int nb_samples,
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int decorr_shift, int decorr_left_weight)
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{
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int i;
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for (i = 0; i < nb_samples; i++) {
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int32_t a, b;
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a = buffer[0][i];
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b = buffer[1][i];
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a -= (b * decorr_left_weight) >> decorr_shift;
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b += a;
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buffer[0][i] = b;
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buffer[1][i] = a;
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}
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}
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static void append_extra_bits(int32_t *buffer[2], int32_t *extra_bits_buffer[2],
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int extra_bits, int channels, int nb_samples)
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{
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int i, ch;
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for (ch = 0; ch < channels; ch++)
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for (i = 0; i < nb_samples; i++)
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buffer[ch][i] = (buffer[ch][i] << extra_bits) | extra_bits_buffer[ch][i];
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}
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static int decode_element(AVCodecContext *avctx, AVFrame *frame, int ch_index,
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int channels)
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{
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@ -389,19 +363,24 @@ static int decode_element(AVCodecContext *avctx, AVFrame *frame, int ch_index,
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decorr_left_weight = 0;
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}
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if (alac->extra_bits && alac->extra_bit_bug) {
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append_extra_bits(alac->output_samples_buffer, alac->extra_bits_buffer,
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alac->extra_bits, channels, alac->nb_samples);
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}
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if (channels == 2) {
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if (alac->extra_bits && alac->extra_bit_bug) {
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alac->dsp.append_extra_bits[1](alac->output_samples_buffer, alac->extra_bits_buffer,
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alac->extra_bits, channels, alac->nb_samples);
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}
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if (channels == 2 && decorr_left_weight) {
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decorrelate_stereo(alac->output_samples_buffer, alac->nb_samples,
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decorr_shift, decorr_left_weight);
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}
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if (decorr_left_weight) {
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alac->dsp.decorrelate_stereo(alac->output_samples_buffer, alac->nb_samples,
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decorr_shift, decorr_left_weight);
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}
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if (alac->extra_bits && !alac->extra_bit_bug) {
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append_extra_bits(alac->output_samples_buffer, alac->extra_bits_buffer,
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alac->extra_bits, channels, alac->nb_samples);
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if (alac->extra_bits && !alac->extra_bit_bug) {
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alac->dsp.append_extra_bits[1](alac->output_samples_buffer, alac->extra_bits_buffer,
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alac->extra_bits, channels, alac->nb_samples);
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}
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} else if (alac->extra_bits) {
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alac->dsp.append_extra_bits[0](alac->output_samples_buffer, alac->extra_bits_buffer,
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alac->extra_bits, channels, alac->nb_samples);
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}
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switch(alac->sample_size) {
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@ -606,6 +585,8 @@ static av_cold int alac_decode_init(AVCodecContext * avctx)
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return ret;
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}
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ff_alacdsp_init(&alac->dsp);
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return 0;
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}
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60
libavcodec/alacdsp.c
Normal file
60
libavcodec/alacdsp.c
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@ -0,0 +1,60 @@
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/*
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* ALAC (Apple Lossless Audio Codec) decoder
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* Copyright (c) 2005 David Hammerton
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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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#include "libavutil/attributes.h"
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#include "alacdsp.h"
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#include "config.h"
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static void decorrelate_stereo(int32_t *buffer[2], int nb_samples,
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int decorr_shift, int decorr_left_weight)
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{
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int i;
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for (i = 0; i < nb_samples; i++) {
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int32_t a, b;
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a = buffer[0][i];
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b = buffer[1][i];
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a -= (b * decorr_left_weight) >> decorr_shift;
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b += a;
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buffer[0][i] = b;
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buffer[1][i] = a;
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}
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}
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static void append_extra_bits(int32_t *buffer[2], int32_t *extra_bits_buffer[2],
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int extra_bits, int channels, int nb_samples)
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{
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int i, ch;
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for (ch = 0; ch < channels; ch++)
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for (i = 0; i < nb_samples; i++)
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buffer[ch][i] = (buffer[ch][i] << extra_bits) | extra_bits_buffer[ch][i];
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}
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av_cold void ff_alacdsp_init(ALACDSPContext *c)
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{
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c->decorrelate_stereo = decorrelate_stereo;
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c->append_extra_bits[0] =
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c->append_extra_bits[1] = append_extra_bits;
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}
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33
libavcodec/alacdsp.h
Normal file
33
libavcodec/alacdsp.h
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@ -0,0 +1,33 @@
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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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#ifndef AVCODEC_ALACDSP_H
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#define AVCODEC_ALACDSP_H
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#include <stdint.h>
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typedef struct ALACDSPContext {
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void (*decorrelate_stereo)(int32_t *buffer[2], int nb_samples,
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int decorr_shift, int decorr_left_weight);
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void (*append_extra_bits[2])(int32_t *buffer[2], int32_t *extra_bits_buffer[2],
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int extra_bits, int channels, int nb_samples);
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} ALACDSPContext;
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void ff_alacdsp_init(ALACDSPContext *c);
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#endif /* AVCODEC_ALACDSP_H */
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