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737eb5976f
It is pretty hopeless that other considerable projects will adopt libavutil alone in other projects. Projects that need small footprint are better off with more specialized libraries such as gnulib or rather just copy the necessary parts that they need. With this in mind, nobody is helped by having libavutil and libavcore split. In order to ease maintenance inside and around FFmpeg and to reduce confusion where to put common code, avcore's functionality is merged (back) to avutil. Signed-off-by: Reinhard Tartler <siretart@tauware.de>
1755 lines
61 KiB
C
1755 lines
61 KiB
C
/*
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* MPEG-4 ALS decoder
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* Copyright (c) 2009 Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
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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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/**
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* @file
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* MPEG-4 ALS decoder
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* @author Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
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*/
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//#define DEBUG
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#include "avcodec.h"
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#include "get_bits.h"
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#include "unary.h"
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#include "mpeg4audio.h"
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#include "bytestream.h"
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#include "bgmc.h"
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#include "dsputil.h"
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#include "libavutil/samplefmt.h"
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#include "libavutil/crc.h"
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#include <stdint.h>
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/** Rice parameters and corresponding index offsets for decoding the
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* indices of scaled PARCOR values. The table chosen is set globally
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* by the encoder and stored in ALSSpecificConfig.
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*/
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static const int8_t parcor_rice_table[3][20][2] = {
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{ {-52, 4}, {-29, 5}, {-31, 4}, { 19, 4}, {-16, 4},
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{ 12, 3}, { -7, 3}, { 9, 3}, { -5, 3}, { 6, 3},
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{ -4, 3}, { 3, 3}, { -3, 2}, { 3, 2}, { -2, 2},
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{ 3, 2}, { -1, 2}, { 2, 2}, { -1, 2}, { 2, 2} },
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{ {-58, 3}, {-42, 4}, {-46, 4}, { 37, 5}, {-36, 4},
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{ 29, 4}, {-29, 4}, { 25, 4}, {-23, 4}, { 20, 4},
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{-17, 4}, { 16, 4}, {-12, 4}, { 12, 3}, {-10, 4},
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{ 7, 3}, { -4, 4}, { 3, 3}, { -1, 3}, { 1, 3} },
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{ {-59, 3}, {-45, 5}, {-50, 4}, { 38, 4}, {-39, 4},
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{ 32, 4}, {-30, 4}, { 25, 3}, {-23, 3}, { 20, 3},
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{-20, 3}, { 16, 3}, {-13, 3}, { 10, 3}, { -7, 3},
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{ 3, 3}, { 0, 3}, { -1, 3}, { 2, 3}, { -1, 2} }
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};
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/** Scaled PARCOR values used for the first two PARCOR coefficients.
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* To be indexed by the Rice coded indices.
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* Generated by: parcor_scaled_values[i] = 32 + ((i * (i+1)) << 7) - (1 << 20)
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* Actual values are divided by 32 in order to be stored in 16 bits.
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*/
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static const int16_t parcor_scaled_values[] = {
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-1048544 / 32, -1048288 / 32, -1047776 / 32, -1047008 / 32,
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-1045984 / 32, -1044704 / 32, -1043168 / 32, -1041376 / 32,
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-1039328 / 32, -1037024 / 32, -1034464 / 32, -1031648 / 32,
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-1028576 / 32, -1025248 / 32, -1021664 / 32, -1017824 / 32,
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-1013728 / 32, -1009376 / 32, -1004768 / 32, -999904 / 32,
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-994784 / 32, -989408 / 32, -983776 / 32, -977888 / 32,
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-971744 / 32, -965344 / 32, -958688 / 32, -951776 / 32,
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-944608 / 32, -937184 / 32, -929504 / 32, -921568 / 32,
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-913376 / 32, -904928 / 32, -896224 / 32, -887264 / 32,
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-878048 / 32, -868576 / 32, -858848 / 32, -848864 / 32,
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-838624 / 32, -828128 / 32, -817376 / 32, -806368 / 32,
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-795104 / 32, -783584 / 32, -771808 / 32, -759776 / 32,
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-747488 / 32, -734944 / 32, -722144 / 32, -709088 / 32,
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-695776 / 32, -682208 / 32, -668384 / 32, -654304 / 32,
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-639968 / 32, -625376 / 32, -610528 / 32, -595424 / 32,
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-580064 / 32, -564448 / 32, -548576 / 32, -532448 / 32,
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-516064 / 32, -499424 / 32, -482528 / 32, -465376 / 32,
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-447968 / 32, -430304 / 32, -412384 / 32, -394208 / 32,
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-375776 / 32, -357088 / 32, -338144 / 32, -318944 / 32,
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-299488 / 32, -279776 / 32, -259808 / 32, -239584 / 32,
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-219104 / 32, -198368 / 32, -177376 / 32, -156128 / 32,
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-134624 / 32, -112864 / 32, -90848 / 32, -68576 / 32,
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-46048 / 32, -23264 / 32, -224 / 32, 23072 / 32,
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46624 / 32, 70432 / 32, 94496 / 32, 118816 / 32,
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143392 / 32, 168224 / 32, 193312 / 32, 218656 / 32,
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244256 / 32, 270112 / 32, 296224 / 32, 322592 / 32,
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349216 / 32, 376096 / 32, 403232 / 32, 430624 / 32,
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458272 / 32, 486176 / 32, 514336 / 32, 542752 / 32,
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571424 / 32, 600352 / 32, 629536 / 32, 658976 / 32,
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688672 / 32, 718624 / 32, 748832 / 32, 779296 / 32,
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810016 / 32, 840992 / 32, 872224 / 32, 903712 / 32,
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935456 / 32, 967456 / 32, 999712 / 32, 1032224 / 32
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};
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/** Gain values of p(0) for long-term prediction.
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* To be indexed by the Rice coded indices.
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*/
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static const uint8_t ltp_gain_values [4][4] = {
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{ 0, 8, 16, 24},
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{32, 40, 48, 56},
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{64, 70, 76, 82},
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{88, 92, 96, 100}
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};
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/** Inter-channel weighting factors for multi-channel correlation.
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* To be indexed by the Rice coded indices.
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*/
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static const int16_t mcc_weightings[] = {
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204, 192, 179, 166, 153, 140, 128, 115,
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102, 89, 76, 64, 51, 38, 25, 12,
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0, -12, -25, -38, -51, -64, -76, -89,
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-102, -115, -128, -140, -153, -166, -179, -192
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};
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/** Tail codes used in arithmetic coding using block Gilbert-Moore codes.
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*/
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static const uint8_t tail_code[16][6] = {
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{ 74, 44, 25, 13, 7, 3},
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{ 68, 42, 24, 13, 7, 3},
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{ 58, 39, 23, 13, 7, 3},
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{126, 70, 37, 19, 10, 5},
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{132, 70, 37, 20, 10, 5},
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{124, 70, 38, 20, 10, 5},
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{120, 69, 37, 20, 11, 5},
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{116, 67, 37, 20, 11, 5},
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{108, 66, 36, 20, 10, 5},
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{102, 62, 36, 20, 10, 5},
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{ 88, 58, 34, 19, 10, 5},
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{162, 89, 49, 25, 13, 7},
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{156, 87, 49, 26, 14, 7},
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{150, 86, 47, 26, 14, 7},
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{142, 84, 47, 26, 14, 7},
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{131, 79, 46, 26, 14, 7}
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};
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enum RA_Flag {
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RA_FLAG_NONE,
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RA_FLAG_FRAMES,
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RA_FLAG_HEADER
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};
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typedef struct {
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uint32_t samples; ///< number of samples, 0xFFFFFFFF if unknown
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int resolution; ///< 000 = 8-bit; 001 = 16-bit; 010 = 24-bit; 011 = 32-bit
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int floating; ///< 1 = IEEE 32-bit floating-point, 0 = integer
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int msb_first; ///< 1 = original CRC calculated on big-endian system, 0 = little-endian
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int frame_length; ///< frame length for each frame (last frame may differ)
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int ra_distance; ///< distance between RA frames (in frames, 0...255)
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enum RA_Flag ra_flag; ///< indicates where the size of ra units is stored
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int adapt_order; ///< adaptive order: 1 = on, 0 = off
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int coef_table; ///< table index of Rice code parameters
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int long_term_prediction; ///< long term prediction (LTP): 1 = on, 0 = off
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int max_order; ///< maximum prediction order (0..1023)
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int block_switching; ///< number of block switching levels
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int bgmc; ///< "Block Gilbert-Moore Code": 1 = on, 0 = off (Rice coding only)
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int sb_part; ///< sub-block partition
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int joint_stereo; ///< joint stereo: 1 = on, 0 = off
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int mc_coding; ///< extended inter-channel coding (multi channel coding): 1 = on, 0 = off
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int chan_config; ///< indicates that a chan_config_info field is present
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int chan_sort; ///< channel rearrangement: 1 = on, 0 = off
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int rlslms; ///< use "Recursive Least Square-Least Mean Square" predictor: 1 = on, 0 = off
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int chan_config_info; ///< mapping of channels to loudspeaker locations. Unused until setting channel configuration is implemented.
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int *chan_pos; ///< original channel positions
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int crc_enabled; ///< enable Cyclic Redundancy Checksum
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} ALSSpecificConfig;
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typedef struct {
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int stop_flag;
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int master_channel;
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int time_diff_flag;
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int time_diff_sign;
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int time_diff_index;
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int weighting[6];
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} ALSChannelData;
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typedef struct {
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AVCodecContext *avctx;
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ALSSpecificConfig sconf;
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GetBitContext gb;
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DSPContext dsp;
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const AVCRC *crc_table;
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uint32_t crc_org; ///< CRC value of the original input data
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uint32_t crc; ///< CRC value calculated from decoded data
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unsigned int cur_frame_length; ///< length of the current frame to decode
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unsigned int frame_id; ///< the frame ID / number of the current frame
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unsigned int js_switch; ///< if true, joint-stereo decoding is enforced
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unsigned int num_blocks; ///< number of blocks used in the current frame
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unsigned int s_max; ///< maximum Rice parameter allowed in entropy coding
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uint8_t *bgmc_lut; ///< pointer at lookup tables used for BGMC
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int *bgmc_lut_status; ///< pointer at lookup table status flags used for BGMC
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int ltp_lag_length; ///< number of bits used for ltp lag value
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int *const_block; ///< contains const_block flags for all channels
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unsigned int *shift_lsbs; ///< contains shift_lsbs flags for all channels
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unsigned int *opt_order; ///< contains opt_order flags for all channels
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int *store_prev_samples; ///< contains store_prev_samples flags for all channels
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int *use_ltp; ///< contains use_ltp flags for all channels
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int *ltp_lag; ///< contains ltp lag values for all channels
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int **ltp_gain; ///< gain values for ltp 5-tap filter for a channel
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int *ltp_gain_buffer; ///< contains all gain values for ltp 5-tap filter
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int32_t **quant_cof; ///< quantized parcor coefficients for a channel
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int32_t *quant_cof_buffer; ///< contains all quantized parcor coefficients
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int32_t **lpc_cof; ///< coefficients of the direct form prediction filter for a channel
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int32_t *lpc_cof_buffer; ///< contains all coefficients of the direct form prediction filter
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int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_cof_buffer
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ALSChannelData **chan_data; ///< channel data for multi-channel correlation
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ALSChannelData *chan_data_buffer; ///< contains channel data for all channels
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int *reverted_channels; ///< stores a flag for each reverted channel
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int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
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int32_t **raw_samples; ///< decoded raw samples for each channel
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int32_t *raw_buffer; ///< contains all decoded raw samples including carryover samples
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uint8_t *crc_buffer; ///< buffer of byte order corrected samples used for CRC check
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} ALSDecContext;
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typedef struct {
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unsigned int block_length; ///< number of samples within the block
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unsigned int ra_block; ///< if true, this is a random access block
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int *const_block; ///< if true, this is a constant value block
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int js_blocks; ///< true if this block contains a difference signal
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unsigned int *shift_lsbs; ///< shift of values for this block
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unsigned int *opt_order; ///< prediction order of this block
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int *store_prev_samples;///< if true, carryover samples have to be stored
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int *use_ltp; ///< if true, long-term prediction is used
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int *ltp_lag; ///< lag value for long-term prediction
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int *ltp_gain; ///< gain values for ltp 5-tap filter
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int32_t *quant_cof; ///< quantized parcor coefficients
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int32_t *lpc_cof; ///< coefficients of the direct form prediction
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int32_t *raw_samples; ///< decoded raw samples / residuals for this block
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int32_t *prev_raw_samples; ///< contains unshifted raw samples from the previous block
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int32_t *raw_other; ///< decoded raw samples of the other channel of a channel pair
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} ALSBlockData;
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static av_cold void dprint_specific_config(ALSDecContext *ctx)
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{
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#ifdef DEBUG
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AVCodecContext *avctx = ctx->avctx;
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ALSSpecificConfig *sconf = &ctx->sconf;
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av_dlog(avctx, "resolution = %i\n", sconf->resolution);
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av_dlog(avctx, "floating = %i\n", sconf->floating);
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av_dlog(avctx, "frame_length = %i\n", sconf->frame_length);
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av_dlog(avctx, "ra_distance = %i\n", sconf->ra_distance);
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av_dlog(avctx, "ra_flag = %i\n", sconf->ra_flag);
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av_dlog(avctx, "adapt_order = %i\n", sconf->adapt_order);
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av_dlog(avctx, "coef_table = %i\n", sconf->coef_table);
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av_dlog(avctx, "long_term_prediction = %i\n", sconf->long_term_prediction);
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av_dlog(avctx, "max_order = %i\n", sconf->max_order);
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av_dlog(avctx, "block_switching = %i\n", sconf->block_switching);
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av_dlog(avctx, "bgmc = %i\n", sconf->bgmc);
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av_dlog(avctx, "sb_part = %i\n", sconf->sb_part);
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av_dlog(avctx, "joint_stereo = %i\n", sconf->joint_stereo);
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av_dlog(avctx, "mc_coding = %i\n", sconf->mc_coding);
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av_dlog(avctx, "chan_config = %i\n", sconf->chan_config);
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av_dlog(avctx, "chan_sort = %i\n", sconf->chan_sort);
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av_dlog(avctx, "RLSLMS = %i\n", sconf->rlslms);
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av_dlog(avctx, "chan_config_info = %i\n", sconf->chan_config_info);
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#endif
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}
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/** Read an ALSSpecificConfig from a buffer into the output struct.
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*/
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static av_cold int read_specific_config(ALSDecContext *ctx)
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{
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GetBitContext gb;
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uint64_t ht_size;
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int i, config_offset;
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MPEG4AudioConfig m4ac;
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ALSSpecificConfig *sconf = &ctx->sconf;
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AVCodecContext *avctx = ctx->avctx;
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uint32_t als_id, header_size, trailer_size;
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init_get_bits(&gb, avctx->extradata, avctx->extradata_size * 8);
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config_offset = ff_mpeg4audio_get_config(&m4ac, avctx->extradata,
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avctx->extradata_size);
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if (config_offset < 0)
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return -1;
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skip_bits_long(&gb, config_offset);
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if (get_bits_left(&gb) < (30 << 3))
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return -1;
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// read the fixed items
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als_id = get_bits_long(&gb, 32);
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avctx->sample_rate = m4ac.sample_rate;
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skip_bits_long(&gb, 32); // sample rate already known
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sconf->samples = get_bits_long(&gb, 32);
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avctx->channels = m4ac.channels;
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skip_bits(&gb, 16); // number of channels already knwon
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skip_bits(&gb, 3); // skip file_type
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sconf->resolution = get_bits(&gb, 3);
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sconf->floating = get_bits1(&gb);
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sconf->msb_first = get_bits1(&gb);
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sconf->frame_length = get_bits(&gb, 16) + 1;
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sconf->ra_distance = get_bits(&gb, 8);
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sconf->ra_flag = get_bits(&gb, 2);
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sconf->adapt_order = get_bits1(&gb);
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sconf->coef_table = get_bits(&gb, 2);
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sconf->long_term_prediction = get_bits1(&gb);
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sconf->max_order = get_bits(&gb, 10);
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sconf->block_switching = get_bits(&gb, 2);
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sconf->bgmc = get_bits1(&gb);
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sconf->sb_part = get_bits1(&gb);
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sconf->joint_stereo = get_bits1(&gb);
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sconf->mc_coding = get_bits1(&gb);
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sconf->chan_config = get_bits1(&gb);
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sconf->chan_sort = get_bits1(&gb);
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sconf->crc_enabled = get_bits1(&gb);
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sconf->rlslms = get_bits1(&gb);
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skip_bits(&gb, 5); // skip 5 reserved bits
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skip_bits1(&gb); // skip aux_data_enabled
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// check for ALSSpecificConfig struct
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if (als_id != MKBETAG('A','L','S','\0'))
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return -1;
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ctx->cur_frame_length = sconf->frame_length;
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// read channel config
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if (sconf->chan_config)
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sconf->chan_config_info = get_bits(&gb, 16);
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// TODO: use this to set avctx->channel_layout
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// read channel sorting
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if (sconf->chan_sort && avctx->channels > 1) {
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int chan_pos_bits = av_ceil_log2(avctx->channels);
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int bits_needed = avctx->channels * chan_pos_bits + 7;
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if (get_bits_left(&gb) < bits_needed)
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return -1;
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if (!(sconf->chan_pos = av_malloc(avctx->channels * sizeof(*sconf->chan_pos))))
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return AVERROR(ENOMEM);
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for (i = 0; i < avctx->channels; i++)
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sconf->chan_pos[i] = get_bits(&gb, chan_pos_bits);
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align_get_bits(&gb);
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// TODO: use this to actually do channel sorting
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} else {
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sconf->chan_sort = 0;
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}
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// read fixed header and trailer sizes,
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// if size = 0xFFFFFFFF then there is no data field!
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if (get_bits_left(&gb) < 64)
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return -1;
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header_size = get_bits_long(&gb, 32);
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trailer_size = get_bits_long(&gb, 32);
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if (header_size == 0xFFFFFFFF)
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header_size = 0;
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if (trailer_size == 0xFFFFFFFF)
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trailer_size = 0;
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ht_size = ((int64_t)(header_size) + (int64_t)(trailer_size)) << 3;
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// skip the header and trailer data
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if (get_bits_left(&gb) < ht_size)
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return -1;
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if (ht_size > INT32_MAX)
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return -1;
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skip_bits_long(&gb, ht_size);
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|
|
|
|
|
// initialize CRC calculation
|
|
if (sconf->crc_enabled) {
|
|
if (get_bits_left(&gb) < 32)
|
|
return -1;
|
|
|
|
if (avctx->error_recognition >= FF_ER_CAREFUL) {
|
|
ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
|
|
ctx->crc = 0xFFFFFFFF;
|
|
ctx->crc_org = ~get_bits_long(&gb, 32);
|
|
} else
|
|
skip_bits_long(&gb, 32);
|
|
}
|
|
|
|
|
|
// no need to read the rest of ALSSpecificConfig (ra_unit_size & aux data)
|
|
|
|
dprint_specific_config(ctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** Check the ALSSpecificConfig for unsupported features.
|
|
*/
|
|
static int check_specific_config(ALSDecContext *ctx)
|
|
{
|
|
ALSSpecificConfig *sconf = &ctx->sconf;
|
|
int error = 0;
|
|
|
|
// report unsupported feature and set error value
|
|
#define MISSING_ERR(cond, str, errval) \
|
|
{ \
|
|
if (cond) { \
|
|
av_log_missing_feature(ctx->avctx, str, 0); \
|
|
error = errval; \
|
|
} \
|
|
}
|
|
|
|
MISSING_ERR(sconf->floating, "Floating point decoding", -1);
|
|
MISSING_ERR(sconf->rlslms, "Adaptive RLS-LMS prediction", -1);
|
|
MISSING_ERR(sconf->chan_sort, "Channel sorting", 0);
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
/** Parse the bs_info field to extract the block partitioning used in
|
|
* block switching mode, refer to ISO/IEC 14496-3, section 11.6.2.
|
|
*/
|
|
static void parse_bs_info(const uint32_t bs_info, unsigned int n,
|
|
unsigned int div, unsigned int **div_blocks,
|
|
unsigned int *num_blocks)
|
|
{
|
|
if (n < 31 && ((bs_info << n) & 0x40000000)) {
|
|
// if the level is valid and the investigated bit n is set
|
|
// then recursively check both children at bits (2n+1) and (2n+2)
|
|
n *= 2;
|
|
div += 1;
|
|
parse_bs_info(bs_info, n + 1, div, div_blocks, num_blocks);
|
|
parse_bs_info(bs_info, n + 2, div, div_blocks, num_blocks);
|
|
} else {
|
|
// else the bit is not set or the last level has been reached
|
|
// (bit implicitly not set)
|
|
**div_blocks = div;
|
|
(*div_blocks)++;
|
|
(*num_blocks)++;
|
|
}
|
|
}
|
|
|
|
|
|
/** Read and decode a Rice codeword.
|
|
*/
|
|
static int32_t decode_rice(GetBitContext *gb, unsigned int k)
|
|
{
|
|
int max = get_bits_left(gb) - k;
|
|
int q = get_unary(gb, 0, max);
|
|
int r = k ? get_bits1(gb) : !(q & 1);
|
|
|
|
if (k > 1) {
|
|
q <<= (k - 1);
|
|
q += get_bits_long(gb, k - 1);
|
|
} else if (!k) {
|
|
q >>= 1;
|
|
}
|
|
return r ? q : ~q;
|
|
}
|
|
|
|
|
|
/** Convert PARCOR coefficient k to direct filter coefficient.
|
|
*/
|
|
static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
|
|
{
|
|
int i, j;
|
|
|
|
for (i = 0, j = k - 1; i < j; i++, j--) {
|
|
int tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
|
|
cof[j] += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
|
|
cof[i] += tmp1;
|
|
}
|
|
if (i == j)
|
|
cof[i] += ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
|
|
|
|
cof[k] = par[k];
|
|
}
|
|
|
|
|
|
/** Read block switching field if necessary and set actual block sizes.
|
|
* Also assure that the block sizes of the last frame correspond to the
|
|
* actual number of samples.
|
|
*/
|
|
static void get_block_sizes(ALSDecContext *ctx, unsigned int *div_blocks,
|
|
uint32_t *bs_info)
|
|
{
|
|
ALSSpecificConfig *sconf = &ctx->sconf;
|
|
GetBitContext *gb = &ctx->gb;
|
|
unsigned int *ptr_div_blocks = div_blocks;
|
|
unsigned int b;
|
|
|
|
if (sconf->block_switching) {
|
|
unsigned int bs_info_len = 1 << (sconf->block_switching + 2);
|
|
*bs_info = get_bits_long(gb, bs_info_len);
|
|
*bs_info <<= (32 - bs_info_len);
|
|
}
|
|
|
|
ctx->num_blocks = 0;
|
|
parse_bs_info(*bs_info, 0, 0, &ptr_div_blocks, &ctx->num_blocks);
|
|
|
|
// The last frame may have an overdetermined block structure given in
|
|
// the bitstream. In that case the defined block structure would need
|
|
// more samples than available to be consistent.
|
|
// The block structure is actually used but the block sizes are adapted
|
|
// to fit the actual number of available samples.
|
|
// Example: 5 samples, 2nd level block sizes: 2 2 2 2.
|
|
// This results in the actual block sizes: 2 2 1 0.
|
|
// This is not specified in 14496-3 but actually done by the reference
|
|
// codec RM22 revision 2.
|
|
// This appears to happen in case of an odd number of samples in the last
|
|
// frame which is actually not allowed by the block length switching part
|
|
// of 14496-3.
|
|
// The ALS conformance files feature an odd number of samples in the last
|
|
// frame.
|
|
|
|
for (b = 0; b < ctx->num_blocks; b++)
|
|
div_blocks[b] = ctx->sconf.frame_length >> div_blocks[b];
|
|
|
|
if (ctx->cur_frame_length != ctx->sconf.frame_length) {
|
|
unsigned int remaining = ctx->cur_frame_length;
|
|
|
|
for (b = 0; b < ctx->num_blocks; b++) {
|
|
if (remaining <= div_blocks[b]) {
|
|
div_blocks[b] = remaining;
|
|
ctx->num_blocks = b + 1;
|
|
break;
|
|
}
|
|
|
|
remaining -= div_blocks[b];
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/** Read the block data for a constant block
|
|
*/
|
|
static void read_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
|
|
{
|
|
ALSSpecificConfig *sconf = &ctx->sconf;
|
|
AVCodecContext *avctx = ctx->avctx;
|
|
GetBitContext *gb = &ctx->gb;
|
|
|
|
*bd->raw_samples = 0;
|
|
*bd->const_block = get_bits1(gb); // 1 = constant value, 0 = zero block (silence)
|
|
bd->js_blocks = get_bits1(gb);
|
|
|
|
// skip 5 reserved bits
|
|
skip_bits(gb, 5);
|
|
|
|
if (*bd->const_block) {
|
|
unsigned int const_val_bits = sconf->floating ? 24 : avctx->bits_per_raw_sample;
|
|
*bd->raw_samples = get_sbits_long(gb, const_val_bits);
|
|
}
|
|
|
|
// ensure constant block decoding by reusing this field
|
|
*bd->const_block = 1;
|
|
}
|
|
|
|
|
|
/** Decode the block data for a constant block
|
|
*/
|
|
static void decode_const_block_data(ALSDecContext *ctx, ALSBlockData *bd)
|
|
{
|
|
int smp = bd->block_length - 1;
|
|
int32_t val = *bd->raw_samples;
|
|
int32_t *dst = bd->raw_samples + 1;
|
|
|
|
// write raw samples into buffer
|
|
for (; smp; smp--)
|
|
*dst++ = val;
|
|
}
|
|
|
|
|
|
/** Read the block data for a non-constant block
|
|
*/
|
|
static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
|
|
{
|
|
ALSSpecificConfig *sconf = &ctx->sconf;
|
|
AVCodecContext *avctx = ctx->avctx;
|
|
GetBitContext *gb = &ctx->gb;
|
|
unsigned int k;
|
|
unsigned int s[8];
|
|
unsigned int sx[8];
|
|
unsigned int sub_blocks, log2_sub_blocks, sb_length;
|
|
unsigned int start = 0;
|
|
unsigned int opt_order;
|
|
int sb;
|
|
int32_t *quant_cof = bd->quant_cof;
|
|
int32_t *current_res;
|
|
|
|
|
|
// ensure variable block decoding by reusing this field
|
|
*bd->const_block = 0;
|
|
|
|
*bd->opt_order = 1;
|
|
bd->js_blocks = get_bits1(gb);
|
|
|
|
opt_order = *bd->opt_order;
|
|
|
|
// determine the number of subblocks for entropy decoding
|
|
if (!sconf->bgmc && !sconf->sb_part) {
|
|
log2_sub_blocks = 0;
|
|
} else {
|
|
if (sconf->bgmc && sconf->sb_part)
|
|
log2_sub_blocks = get_bits(gb, 2);
|
|
else
|
|
log2_sub_blocks = 2 * get_bits1(gb);
|
|
}
|
|
|
|
sub_blocks = 1 << log2_sub_blocks;
|
|
|
|
// do not continue in case of a damaged stream since
|
|
// block_length must be evenly divisible by sub_blocks
|
|
if (bd->block_length & (sub_blocks - 1)) {
|
|
av_log(avctx, AV_LOG_WARNING,
|
|
"Block length is not evenly divisible by the number of subblocks.\n");
|
|
return -1;
|
|
}
|
|
|
|
sb_length = bd->block_length >> log2_sub_blocks;
|
|
|
|
if (sconf->bgmc) {
|
|
s[0] = get_bits(gb, 8 + (sconf->resolution > 1));
|
|
for (k = 1; k < sub_blocks; k++)
|
|
s[k] = s[k - 1] + decode_rice(gb, 2);
|
|
|
|
for (k = 0; k < sub_blocks; k++) {
|
|
sx[k] = s[k] & 0x0F;
|
|
s [k] >>= 4;
|
|
}
|
|
} else {
|
|
s[0] = get_bits(gb, 4 + (sconf->resolution > 1));
|
|
for (k = 1; k < sub_blocks; k++)
|
|
s[k] = s[k - 1] + decode_rice(gb, 0);
|
|
}
|
|
|
|
if (get_bits1(gb))
|
|
*bd->shift_lsbs = get_bits(gb, 4) + 1;
|
|
|
|
*bd->store_prev_samples = (bd->js_blocks && bd->raw_other) || *bd->shift_lsbs;
|
|
|
|
|
|
if (!sconf->rlslms) {
|
|
if (sconf->adapt_order) {
|
|
int opt_order_length = av_ceil_log2(av_clip((bd->block_length >> 3) - 1,
|
|
2, sconf->max_order + 1));
|
|
*bd->opt_order = get_bits(gb, opt_order_length);
|
|
} else {
|
|
*bd->opt_order = sconf->max_order;
|
|
}
|
|
|
|
opt_order = *bd->opt_order;
|
|
|
|
if (opt_order) {
|
|
int add_base;
|
|
|
|
if (sconf->coef_table == 3) {
|
|
add_base = 0x7F;
|
|
|
|
// read coefficient 0
|
|
quant_cof[0] = 32 * parcor_scaled_values[get_bits(gb, 7)];
|
|
|
|
// read coefficient 1
|
|
if (opt_order > 1)
|
|
quant_cof[1] = -32 * parcor_scaled_values[get_bits(gb, 7)];
|
|
|
|
// read coefficients 2 to opt_order
|
|
for (k = 2; k < opt_order; k++)
|
|
quant_cof[k] = get_bits(gb, 7);
|
|
} else {
|
|
int k_max;
|
|
add_base = 1;
|
|
|
|
// read coefficient 0 to 19
|
|
k_max = FFMIN(opt_order, 20);
|
|
for (k = 0; k < k_max; k++) {
|
|
int rice_param = parcor_rice_table[sconf->coef_table][k][1];
|
|
int offset = parcor_rice_table[sconf->coef_table][k][0];
|
|
quant_cof[k] = decode_rice(gb, rice_param) + offset;
|
|
}
|
|
|
|
// read coefficients 20 to 126
|
|
k_max = FFMIN(opt_order, 127);
|
|
for (; k < k_max; k++)
|
|
quant_cof[k] = decode_rice(gb, 2) + (k & 1);
|
|
|
|
// read coefficients 127 to opt_order
|
|
for (; k < opt_order; k++)
|
|
quant_cof[k] = decode_rice(gb, 1);
|
|
|
|
quant_cof[0] = 32 * parcor_scaled_values[quant_cof[0] + 64];
|
|
|
|
if (opt_order > 1)
|
|
quant_cof[1] = -32 * parcor_scaled_values[quant_cof[1] + 64];
|
|
}
|
|
|
|
for (k = 2; k < opt_order; k++)
|
|
quant_cof[k] = (quant_cof[k] << 14) + (add_base << 13);
|
|
}
|
|
}
|
|
|
|
// read LTP gain and lag values
|
|
if (sconf->long_term_prediction) {
|
|
*bd->use_ltp = get_bits1(gb);
|
|
|
|
if (*bd->use_ltp) {
|
|
int r, c;
|
|
|
|
bd->ltp_gain[0] = decode_rice(gb, 1) << 3;
|
|
bd->ltp_gain[1] = decode_rice(gb, 2) << 3;
|
|
|
|
r = get_unary(gb, 0, 4);
|
|
c = get_bits(gb, 2);
|
|
bd->ltp_gain[2] = ltp_gain_values[r][c];
|
|
|
|
bd->ltp_gain[3] = decode_rice(gb, 2) << 3;
|
|
bd->ltp_gain[4] = decode_rice(gb, 1) << 3;
|
|
|
|
*bd->ltp_lag = get_bits(gb, ctx->ltp_lag_length);
|
|
*bd->ltp_lag += FFMAX(4, opt_order + 1);
|
|
}
|
|
}
|
|
|
|
// read first value and residuals in case of a random access block
|
|
if (bd->ra_block) {
|
|
if (opt_order)
|
|
bd->raw_samples[0] = decode_rice(gb, avctx->bits_per_raw_sample - 4);
|
|
if (opt_order > 1)
|
|
bd->raw_samples[1] = decode_rice(gb, FFMIN(s[0] + 3, ctx->s_max));
|
|
if (opt_order > 2)
|
|
bd->raw_samples[2] = decode_rice(gb, FFMIN(s[0] + 1, ctx->s_max));
|
|
|
|
start = FFMIN(opt_order, 3);
|
|
}
|
|
|
|
// read all residuals
|
|
if (sconf->bgmc) {
|
|
int delta[8];
|
|
unsigned int k [8];
|
|
unsigned int b = av_clip((av_ceil_log2(bd->block_length) - 3) >> 1, 0, 5);
|
|
unsigned int i = start;
|
|
|
|
// read most significant bits
|
|
unsigned int high;
|
|
unsigned int low;
|
|
unsigned int value;
|
|
|
|
ff_bgmc_decode_init(gb, &high, &low, &value);
|
|
|
|
current_res = bd->raw_samples + start;
|
|
|
|
for (sb = 0; sb < sub_blocks; sb++, i = 0) {
|
|
k [sb] = s[sb] > b ? s[sb] - b : 0;
|
|
delta[sb] = 5 - s[sb] + k[sb];
|
|
|
|
ff_bgmc_decode(gb, sb_length, current_res,
|
|
delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);
|
|
|
|
current_res += sb_length;
|
|
}
|
|
|
|
ff_bgmc_decode_end(gb);
|
|
|
|
|
|
// read least significant bits and tails
|
|
i = start;
|
|
current_res = bd->raw_samples + start;
|
|
|
|
for (sb = 0; sb < sub_blocks; sb++, i = 0) {
|
|
unsigned int cur_tail_code = tail_code[sx[sb]][delta[sb]];
|
|
unsigned int cur_k = k[sb];
|
|
unsigned int cur_s = s[sb];
|
|
|
|
for (; i < sb_length; i++) {
|
|
int32_t res = *current_res;
|
|
|
|
if (res == cur_tail_code) {
|
|
unsigned int max_msb = (2 + (sx[sb] > 2) + (sx[sb] > 10))
|
|
<< (5 - delta[sb]);
|
|
|
|
res = decode_rice(gb, cur_s);
|
|
|
|
if (res >= 0) {
|
|
res += (max_msb ) << cur_k;
|
|
} else {
|
|
res -= (max_msb - 1) << cur_k;
|
|
}
|
|
} else {
|
|
if (res > cur_tail_code)
|
|
res--;
|
|
|
|
if (res & 1)
|
|
res = -res;
|
|
|
|
res >>= 1;
|
|
|
|
if (cur_k) {
|
|
res <<= cur_k;
|
|
res |= get_bits_long(gb, cur_k);
|
|
}
|
|
}
|
|
|
|
*current_res++ = res;
|
|
}
|
|
}
|
|
} else {
|
|
current_res = bd->raw_samples + start;
|
|
|
|
for (sb = 0; sb < sub_blocks; sb++, start = 0)
|
|
for (; start < sb_length; start++)
|
|
*current_res++ = decode_rice(gb, s[sb]);
|
|
}
|
|
|
|
if (!sconf->mc_coding || ctx->js_switch)
|
|
align_get_bits(gb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** Decode the block data for a non-constant block
|
|
*/
|
|
static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
|
|
{
|
|
ALSSpecificConfig *sconf = &ctx->sconf;
|
|
unsigned int block_length = bd->block_length;
|
|
unsigned int smp = 0;
|
|
unsigned int k;
|
|
int opt_order = *bd->opt_order;
|
|
int sb;
|
|
int64_t y;
|
|
int32_t *quant_cof = bd->quant_cof;
|
|
int32_t *lpc_cof = bd->lpc_cof;
|
|
int32_t *raw_samples = bd->raw_samples;
|
|
int32_t *raw_samples_end = bd->raw_samples + bd->block_length;
|
|
int32_t *lpc_cof_reversed = ctx->lpc_cof_reversed_buffer;
|
|
|
|
// reverse long-term prediction
|
|
if (*bd->use_ltp) {
|
|
int ltp_smp;
|
|
|
|
for (ltp_smp = FFMAX(*bd->ltp_lag - 2, 0); ltp_smp < block_length; ltp_smp++) {
|
|
int center = ltp_smp - *bd->ltp_lag;
|
|
int begin = FFMAX(0, center - 2);
|
|
int end = center + 3;
|
|
int tab = 5 - (end - begin);
|
|
int base;
|
|
|
|
y = 1 << 6;
|
|
|
|
for (base = begin; base < end; base++, tab++)
|
|
y += MUL64(bd->ltp_gain[tab], raw_samples[base]);
|
|
|
|
raw_samples[ltp_smp] += y >> 7;
|
|
}
|
|
}
|
|
|
|
// reconstruct all samples from residuals
|
|
if (bd->ra_block) {
|
|
for (smp = 0; smp < opt_order; smp++) {
|
|
y = 1 << 19;
|
|
|
|
for (sb = 0; sb < smp; sb++)
|
|
y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
|
|
|
|
*raw_samples++ -= y >> 20;
|
|
parcor_to_lpc(smp, quant_cof, lpc_cof);
|
|
}
|
|
} else {
|
|
for (k = 0; k < opt_order; k++)
|
|
parcor_to_lpc(k, quant_cof, lpc_cof);
|
|
|
|
// store previous samples in case that they have to be altered
|
|
if (*bd->store_prev_samples)
|
|
memcpy(bd->prev_raw_samples, raw_samples - sconf->max_order,
|
|
sizeof(*bd->prev_raw_samples) * sconf->max_order);
|
|
|
|
// reconstruct difference signal for prediction (joint-stereo)
|
|
if (bd->js_blocks && bd->raw_other) {
|
|
int32_t *left, *right;
|
|
|
|
if (bd->raw_other > raw_samples) { // D = R - L
|
|
left = raw_samples;
|
|
right = bd->raw_other;
|
|
} else { // D = R - L
|
|
left = bd->raw_other;
|
|
right = raw_samples;
|
|
}
|
|
|
|
for (sb = -1; sb >= -sconf->max_order; sb--)
|
|
raw_samples[sb] = right[sb] - left[sb];
|
|
}
|
|
|
|
// reconstruct shifted signal
|
|
if (*bd->shift_lsbs)
|
|
for (sb = -1; sb >= -sconf->max_order; sb--)
|
|
raw_samples[sb] >>= *bd->shift_lsbs;
|
|
}
|
|
|
|
// reverse linear prediction coefficients for efficiency
|
|
lpc_cof = lpc_cof + opt_order;
|
|
|
|
for (sb = 0; sb < opt_order; sb++)
|
|
lpc_cof_reversed[sb] = lpc_cof[-(sb + 1)];
|
|
|
|
// reconstruct raw samples
|
|
raw_samples = bd->raw_samples + smp;
|
|
lpc_cof = lpc_cof_reversed + opt_order;
|
|
|
|
for (; raw_samples < raw_samples_end; raw_samples++) {
|
|
y = 1 << 19;
|
|
|
|
for (sb = -opt_order; sb < 0; sb++)
|
|
y += MUL64(lpc_cof[sb], raw_samples[sb]);
|
|
|
|
*raw_samples -= y >> 20;
|
|
}
|
|
|
|
raw_samples = bd->raw_samples;
|
|
|
|
// restore previous samples in case that they have been altered
|
|
if (*bd->store_prev_samples)
|
|
memcpy(raw_samples - sconf->max_order, bd->prev_raw_samples,
|
|
sizeof(*raw_samples) * sconf->max_order);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** Read the block data.
|
|
*/
|
|
static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
|
|
{
|
|
GetBitContext *gb = &ctx->gb;
|
|
|
|
*bd->shift_lsbs = 0;
|
|
// read block type flag and read the samples accordingly
|
|
if (get_bits1(gb)) {
|
|
if (read_var_block_data(ctx, bd))
|
|
return -1;
|
|
} else {
|
|
read_const_block_data(ctx, bd);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** Decode the block data.
|
|
*/
|
|
static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
|
|
{
|
|
unsigned int smp;
|
|
|
|
// read block type flag and read the samples accordingly
|
|
if (*bd->const_block)
|
|
decode_const_block_data(ctx, bd);
|
|
else if (decode_var_block_data(ctx, bd))
|
|
return -1;
|
|
|
|
// TODO: read RLSLMS extension data
|
|
|
|
if (*bd->shift_lsbs)
|
|
for (smp = 0; smp < bd->block_length; smp++)
|
|
bd->raw_samples[smp] <<= *bd->shift_lsbs;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** Read and decode block data successively.
|
|
*/
|
|
static int read_decode_block(ALSDecContext *ctx, ALSBlockData *bd)
|
|
{
|
|
int ret;
|
|
|
|
ret = read_block(ctx, bd);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = decode_block(ctx, bd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/** Compute the number of samples left to decode for the current frame and
|
|
* sets these samples to zero.
|
|
*/
|
|
static void zero_remaining(unsigned int b, unsigned int b_max,
|
|
const unsigned int *div_blocks, int32_t *buf)
|
|
{
|
|
unsigned int count = 0;
|
|
|
|
while (b < b_max)
|
|
count += div_blocks[b];
|
|
|
|
if (count)
|
|
memset(buf, 0, sizeof(*buf) * count);
|
|
}
|
|
|
|
|
|
/** Decode blocks independently.
|
|
*/
|
|
static int decode_blocks_ind(ALSDecContext *ctx, unsigned int ra_frame,
|
|
unsigned int c, const unsigned int *div_blocks,
|
|
unsigned int *js_blocks)
|
|
{
|
|
unsigned int b;
|
|
ALSBlockData bd;
|
|
|
|
memset(&bd, 0, sizeof(ALSBlockData));
|
|
|
|
bd.ra_block = ra_frame;
|
|
bd.const_block = ctx->const_block;
|
|
bd.shift_lsbs = ctx->shift_lsbs;
|
|
bd.opt_order = ctx->opt_order;
|
|
bd.store_prev_samples = ctx->store_prev_samples;
|
|
bd.use_ltp = ctx->use_ltp;
|
|
bd.ltp_lag = ctx->ltp_lag;
|
|
bd.ltp_gain = ctx->ltp_gain[0];
|
|
bd.quant_cof = ctx->quant_cof[0];
|
|
bd.lpc_cof = ctx->lpc_cof[0];
|
|
bd.prev_raw_samples = ctx->prev_raw_samples;
|
|
bd.raw_samples = ctx->raw_samples[c];
|
|
|
|
|
|
for (b = 0; b < ctx->num_blocks; b++) {
|
|
bd.block_length = div_blocks[b];
|
|
|
|
if (read_decode_block(ctx, &bd)) {
|
|
// damaged block, write zero for the rest of the frame
|
|
zero_remaining(b, ctx->num_blocks, div_blocks, bd.raw_samples);
|
|
return -1;
|
|
}
|
|
bd.raw_samples += div_blocks[b];
|
|
bd.ra_block = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** Decode blocks dependently.
|
|
*/
|
|
static int decode_blocks(ALSDecContext *ctx, unsigned int ra_frame,
|
|
unsigned int c, const unsigned int *div_blocks,
|
|
unsigned int *js_blocks)
|
|
{
|
|
ALSSpecificConfig *sconf = &ctx->sconf;
|
|
unsigned int offset = 0;
|
|
unsigned int b;
|
|
ALSBlockData bd[2];
|
|
|
|
memset(bd, 0, 2 * sizeof(ALSBlockData));
|
|
|
|
bd[0].ra_block = ra_frame;
|
|
bd[0].const_block = ctx->const_block;
|
|
bd[0].shift_lsbs = ctx->shift_lsbs;
|
|
bd[0].opt_order = ctx->opt_order;
|
|
bd[0].store_prev_samples = ctx->store_prev_samples;
|
|
bd[0].use_ltp = ctx->use_ltp;
|
|
bd[0].ltp_lag = ctx->ltp_lag;
|
|
bd[0].ltp_gain = ctx->ltp_gain[0];
|
|
bd[0].quant_cof = ctx->quant_cof[0];
|
|
bd[0].lpc_cof = ctx->lpc_cof[0];
|
|
bd[0].prev_raw_samples = ctx->prev_raw_samples;
|
|
bd[0].js_blocks = *js_blocks;
|
|
|
|
bd[1].ra_block = ra_frame;
|
|
bd[1].const_block = ctx->const_block;
|
|
bd[1].shift_lsbs = ctx->shift_lsbs;
|
|
bd[1].opt_order = ctx->opt_order;
|
|
bd[1].store_prev_samples = ctx->store_prev_samples;
|
|
bd[1].use_ltp = ctx->use_ltp;
|
|
bd[1].ltp_lag = ctx->ltp_lag;
|
|
bd[1].ltp_gain = ctx->ltp_gain[0];
|
|
bd[1].quant_cof = ctx->quant_cof[0];
|
|
bd[1].lpc_cof = ctx->lpc_cof[0];
|
|
bd[1].prev_raw_samples = ctx->prev_raw_samples;
|
|
bd[1].js_blocks = *(js_blocks + 1);
|
|
|
|
// decode all blocks
|
|
for (b = 0; b < ctx->num_blocks; b++) {
|
|
unsigned int s;
|
|
|
|
bd[0].block_length = div_blocks[b];
|
|
bd[1].block_length = div_blocks[b];
|
|
|
|
bd[0].raw_samples = ctx->raw_samples[c ] + offset;
|
|
bd[1].raw_samples = ctx->raw_samples[c + 1] + offset;
|
|
|
|
bd[0].raw_other = bd[1].raw_samples;
|
|
bd[1].raw_other = bd[0].raw_samples;
|
|
|
|
if(read_decode_block(ctx, &bd[0]) || read_decode_block(ctx, &bd[1])) {
|
|
// damaged block, write zero for the rest of the frame
|
|
zero_remaining(b, ctx->num_blocks, div_blocks, bd[0].raw_samples);
|
|
zero_remaining(b, ctx->num_blocks, div_blocks, bd[1].raw_samples);
|
|
return -1;
|
|
}
|
|
|
|
// reconstruct joint-stereo blocks
|
|
if (bd[0].js_blocks) {
|
|
if (bd[1].js_blocks)
|
|
av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel pair!\n");
|
|
|
|
for (s = 0; s < div_blocks[b]; s++)
|
|
bd[0].raw_samples[s] = bd[1].raw_samples[s] - bd[0].raw_samples[s];
|
|
} else if (bd[1].js_blocks) {
|
|
for (s = 0; s < div_blocks[b]; s++)
|
|
bd[1].raw_samples[s] = bd[1].raw_samples[s] + bd[0].raw_samples[s];
|
|
}
|
|
|
|
offset += div_blocks[b];
|
|
bd[0].ra_block = 0;
|
|
bd[1].ra_block = 0;
|
|
}
|
|
|
|
// store carryover raw samples,
|
|
// the others channel raw samples are stored by the calling function.
|
|
memmove(ctx->raw_samples[c] - sconf->max_order,
|
|
ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
|
|
sizeof(*ctx->raw_samples[c]) * sconf->max_order);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** Read the channel data.
|
|
*/
|
|
static int read_channel_data(ALSDecContext *ctx, ALSChannelData *cd, int c)
|
|
{
|
|
GetBitContext *gb = &ctx->gb;
|
|
ALSChannelData *current = cd;
|
|
unsigned int channels = ctx->avctx->channels;
|
|
int entries = 0;
|
|
|
|
while (entries < channels && !(current->stop_flag = get_bits1(gb))) {
|
|
current->master_channel = get_bits_long(gb, av_ceil_log2(channels));
|
|
|
|
if (current->master_channel >= channels) {
|
|
av_log(ctx->avctx, AV_LOG_ERROR, "Invalid master channel!\n");
|
|
return -1;
|
|
}
|
|
|
|
if (current->master_channel != c) {
|
|
current->time_diff_flag = get_bits1(gb);
|
|
current->weighting[0] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
|
|
current->weighting[1] = mcc_weightings[av_clip(decode_rice(gb, 2) + 14, 0, 32)];
|
|
current->weighting[2] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
|
|
|
|
if (current->time_diff_flag) {
|
|
current->weighting[3] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
|
|
current->weighting[4] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
|
|
current->weighting[5] = mcc_weightings[av_clip(decode_rice(gb, 1) + 16, 0, 32)];
|
|
|
|
current->time_diff_sign = get_bits1(gb);
|
|
current->time_diff_index = get_bits(gb, ctx->ltp_lag_length - 3) + 3;
|
|
}
|
|
}
|
|
|
|
current++;
|
|
entries++;
|
|
}
|
|
|
|
if (entries == channels) {
|
|
av_log(ctx->avctx, AV_LOG_ERROR, "Damaged channel data!\n");
|
|
return -1;
|
|
}
|
|
|
|
align_get_bits(gb);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** Recursively reverts the inter-channel correlation for a block.
|
|
*/
|
|
static int revert_channel_correlation(ALSDecContext *ctx, ALSBlockData *bd,
|
|
ALSChannelData **cd, int *reverted,
|
|
unsigned int offset, int c)
|
|
{
|
|
ALSChannelData *ch = cd[c];
|
|
unsigned int dep = 0;
|
|
unsigned int channels = ctx->avctx->channels;
|
|
|
|
if (reverted[c])
|
|
return 0;
|
|
|
|
reverted[c] = 1;
|
|
|
|
while (dep < channels && !ch[dep].stop_flag) {
|
|
revert_channel_correlation(ctx, bd, cd, reverted, offset,
|
|
ch[dep].master_channel);
|
|
|
|
dep++;
|
|
}
|
|
|
|
if (dep == channels) {
|
|
av_log(ctx->avctx, AV_LOG_WARNING, "Invalid channel correlation!\n");
|
|
return -1;
|
|
}
|
|
|
|
bd->const_block = ctx->const_block + c;
|
|
bd->shift_lsbs = ctx->shift_lsbs + c;
|
|
bd->opt_order = ctx->opt_order + c;
|
|
bd->store_prev_samples = ctx->store_prev_samples + c;
|
|
bd->use_ltp = ctx->use_ltp + c;
|
|
bd->ltp_lag = ctx->ltp_lag + c;
|
|
bd->ltp_gain = ctx->ltp_gain[c];
|
|
bd->lpc_cof = ctx->lpc_cof[c];
|
|
bd->quant_cof = ctx->quant_cof[c];
|
|
bd->raw_samples = ctx->raw_samples[c] + offset;
|
|
|
|
dep = 0;
|
|
while (!ch[dep].stop_flag) {
|
|
unsigned int smp;
|
|
unsigned int begin = 1;
|
|
unsigned int end = bd->block_length - 1;
|
|
int64_t y;
|
|
int32_t *master = ctx->raw_samples[ch[dep].master_channel] + offset;
|
|
|
|
if (ch[dep].time_diff_flag) {
|
|
int t = ch[dep].time_diff_index;
|
|
|
|
if (ch[dep].time_diff_sign) {
|
|
t = -t;
|
|
begin -= t;
|
|
} else {
|
|
end -= t;
|
|
}
|
|
|
|
for (smp = begin; smp < end; smp++) {
|
|
y = (1 << 6) +
|
|
MUL64(ch[dep].weighting[0], master[smp - 1 ]) +
|
|
MUL64(ch[dep].weighting[1], master[smp ]) +
|
|
MUL64(ch[dep].weighting[2], master[smp + 1 ]) +
|
|
MUL64(ch[dep].weighting[3], master[smp - 1 + t]) +
|
|
MUL64(ch[dep].weighting[4], master[smp + t]) +
|
|
MUL64(ch[dep].weighting[5], master[smp + 1 + t]);
|
|
|
|
bd->raw_samples[smp] += y >> 7;
|
|
}
|
|
} else {
|
|
for (smp = begin; smp < end; smp++) {
|
|
y = (1 << 6) +
|
|
MUL64(ch[dep].weighting[0], master[smp - 1]) +
|
|
MUL64(ch[dep].weighting[1], master[smp ]) +
|
|
MUL64(ch[dep].weighting[2], master[smp + 1]);
|
|
|
|
bd->raw_samples[smp] += y >> 7;
|
|
}
|
|
}
|
|
|
|
dep++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** Read the frame data.
|
|
*/
|
|
static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
|
|
{
|
|
ALSSpecificConfig *sconf = &ctx->sconf;
|
|
AVCodecContext *avctx = ctx->avctx;
|
|
GetBitContext *gb = &ctx->gb;
|
|
unsigned int div_blocks[32]; ///< block sizes.
|
|
unsigned int c;
|
|
unsigned int js_blocks[2];
|
|
|
|
uint32_t bs_info = 0;
|
|
|
|
// skip the size of the ra unit if present in the frame
|
|
if (sconf->ra_flag == RA_FLAG_FRAMES && ra_frame)
|
|
skip_bits_long(gb, 32);
|
|
|
|
if (sconf->mc_coding && sconf->joint_stereo) {
|
|
ctx->js_switch = get_bits1(gb);
|
|
align_get_bits(gb);
|
|
}
|
|
|
|
if (!sconf->mc_coding || ctx->js_switch) {
|
|
int independent_bs = !sconf->joint_stereo;
|
|
|
|
for (c = 0; c < avctx->channels; c++) {
|
|
js_blocks[0] = 0;
|
|
js_blocks[1] = 0;
|
|
|
|
get_block_sizes(ctx, div_blocks, &bs_info);
|
|
|
|
// if joint_stereo and block_switching is set, independent decoding
|
|
// is signaled via the first bit of bs_info
|
|
if (sconf->joint_stereo && sconf->block_switching)
|
|
if (bs_info >> 31)
|
|
independent_bs = 2;
|
|
|
|
// if this is the last channel, it has to be decoded independently
|
|
if (c == avctx->channels - 1)
|
|
independent_bs = 1;
|
|
|
|
if (independent_bs) {
|
|
if (decode_blocks_ind(ctx, ra_frame, c, div_blocks, js_blocks))
|
|
return -1;
|
|
|
|
independent_bs--;
|
|
} else {
|
|
if (decode_blocks(ctx, ra_frame, c, div_blocks, js_blocks))
|
|
return -1;
|
|
|
|
c++;
|
|
}
|
|
|
|
// store carryover raw samples
|
|
memmove(ctx->raw_samples[c] - sconf->max_order,
|
|
ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
|
|
sizeof(*ctx->raw_samples[c]) * sconf->max_order);
|
|
}
|
|
} else { // multi-channel coding
|
|
ALSBlockData bd;
|
|
int b;
|
|
int *reverted_channels = ctx->reverted_channels;
|
|
unsigned int offset = 0;
|
|
|
|
for (c = 0; c < avctx->channels; c++)
|
|
if (ctx->chan_data[c] < ctx->chan_data_buffer) {
|
|
av_log(ctx->avctx, AV_LOG_ERROR, "Invalid channel data!\n");
|
|
return -1;
|
|
}
|
|
|
|
memset(&bd, 0, sizeof(ALSBlockData));
|
|
memset(reverted_channels, 0, sizeof(*reverted_channels) * avctx->channels);
|
|
|
|
bd.ra_block = ra_frame;
|
|
bd.prev_raw_samples = ctx->prev_raw_samples;
|
|
|
|
get_block_sizes(ctx, div_blocks, &bs_info);
|
|
|
|
for (b = 0; b < ctx->num_blocks; b++) {
|
|
bd.block_length = div_blocks[b];
|
|
|
|
for (c = 0; c < avctx->channels; c++) {
|
|
bd.const_block = ctx->const_block + c;
|
|
bd.shift_lsbs = ctx->shift_lsbs + c;
|
|
bd.opt_order = ctx->opt_order + c;
|
|
bd.store_prev_samples = ctx->store_prev_samples + c;
|
|
bd.use_ltp = ctx->use_ltp + c;
|
|
bd.ltp_lag = ctx->ltp_lag + c;
|
|
bd.ltp_gain = ctx->ltp_gain[c];
|
|
bd.lpc_cof = ctx->lpc_cof[c];
|
|
bd.quant_cof = ctx->quant_cof[c];
|
|
bd.raw_samples = ctx->raw_samples[c] + offset;
|
|
bd.raw_other = NULL;
|
|
|
|
read_block(ctx, &bd);
|
|
if (read_channel_data(ctx, ctx->chan_data[c], c))
|
|
return -1;
|
|
}
|
|
|
|
for (c = 0; c < avctx->channels; c++)
|
|
if (revert_channel_correlation(ctx, &bd, ctx->chan_data,
|
|
reverted_channels, offset, c))
|
|
return -1;
|
|
|
|
for (c = 0; c < avctx->channels; c++) {
|
|
bd.const_block = ctx->const_block + c;
|
|
bd.shift_lsbs = ctx->shift_lsbs + c;
|
|
bd.opt_order = ctx->opt_order + c;
|
|
bd.store_prev_samples = ctx->store_prev_samples + c;
|
|
bd.use_ltp = ctx->use_ltp + c;
|
|
bd.ltp_lag = ctx->ltp_lag + c;
|
|
bd.ltp_gain = ctx->ltp_gain[c];
|
|
bd.lpc_cof = ctx->lpc_cof[c];
|
|
bd.quant_cof = ctx->quant_cof[c];
|
|
bd.raw_samples = ctx->raw_samples[c] + offset;
|
|
decode_block(ctx, &bd);
|
|
}
|
|
|
|
memset(reverted_channels, 0, avctx->channels * sizeof(*reverted_channels));
|
|
offset += div_blocks[b];
|
|
bd.ra_block = 0;
|
|
}
|
|
|
|
// store carryover raw samples
|
|
for (c = 0; c < avctx->channels; c++)
|
|
memmove(ctx->raw_samples[c] - sconf->max_order,
|
|
ctx->raw_samples[c] - sconf->max_order + sconf->frame_length,
|
|
sizeof(*ctx->raw_samples[c]) * sconf->max_order);
|
|
}
|
|
|
|
// TODO: read_diff_float_data
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** Decode an ALS frame.
|
|
*/
|
|
static int decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
AVPacket *avpkt)
|
|
{
|
|
ALSDecContext *ctx = avctx->priv_data;
|
|
ALSSpecificConfig *sconf = &ctx->sconf;
|
|
const uint8_t *buffer = avpkt->data;
|
|
int buffer_size = avpkt->size;
|
|
int invalid_frame, size;
|
|
unsigned int c, sample, ra_frame, bytes_read, shift;
|
|
|
|
init_get_bits(&ctx->gb, buffer, buffer_size * 8);
|
|
|
|
// In the case that the distance between random access frames is set to zero
|
|
// (sconf->ra_distance == 0) no frame is treated as a random access frame.
|
|
// For the first frame, if prediction is used, all samples used from the
|
|
// previous frame are assumed to be zero.
|
|
ra_frame = sconf->ra_distance && !(ctx->frame_id % sconf->ra_distance);
|
|
|
|
// the last frame to decode might have a different length
|
|
if (sconf->samples != 0xFFFFFFFF)
|
|
ctx->cur_frame_length = FFMIN(sconf->samples - ctx->frame_id * (uint64_t) sconf->frame_length,
|
|
sconf->frame_length);
|
|
else
|
|
ctx->cur_frame_length = sconf->frame_length;
|
|
|
|
// decode the frame data
|
|
if ((invalid_frame = read_frame_data(ctx, ra_frame) < 0))
|
|
av_log(ctx->avctx, AV_LOG_WARNING,
|
|
"Reading frame data failed. Skipping RA unit.\n");
|
|
|
|
ctx->frame_id++;
|
|
|
|
// check for size of decoded data
|
|
size = ctx->cur_frame_length * avctx->channels *
|
|
(av_get_bits_per_sample_fmt(avctx->sample_fmt) >> 3);
|
|
|
|
if (size > *data_size) {
|
|
av_log(avctx, AV_LOG_ERROR, "Decoded data exceeds buffer size.\n");
|
|
return -1;
|
|
}
|
|
|
|
*data_size = size;
|
|
|
|
// transform decoded frame into output format
|
|
#define INTERLEAVE_OUTPUT(bps) \
|
|
{ \
|
|
int##bps##_t *dest = (int##bps##_t*) data; \
|
|
shift = bps - ctx->avctx->bits_per_raw_sample; \
|
|
for (sample = 0; sample < ctx->cur_frame_length; sample++) \
|
|
for (c = 0; c < avctx->channels; c++) \
|
|
*dest++ = ctx->raw_samples[c][sample] << shift; \
|
|
}
|
|
|
|
if (ctx->avctx->bits_per_raw_sample <= 16) {
|
|
INTERLEAVE_OUTPUT(16)
|
|
} else {
|
|
INTERLEAVE_OUTPUT(32)
|
|
}
|
|
|
|
// update CRC
|
|
if (sconf->crc_enabled && avctx->error_recognition >= FF_ER_CAREFUL) {
|
|
int swap = HAVE_BIGENDIAN != sconf->msb_first;
|
|
|
|
if (ctx->avctx->bits_per_raw_sample == 24) {
|
|
int32_t *src = data;
|
|
|
|
for (sample = 0;
|
|
sample < ctx->cur_frame_length * avctx->channels;
|
|
sample++) {
|
|
int32_t v;
|
|
|
|
if (swap)
|
|
v = av_bswap32(src[sample]);
|
|
else
|
|
v = src[sample];
|
|
if (!HAVE_BIGENDIAN)
|
|
v >>= 8;
|
|
|
|
ctx->crc = av_crc(ctx->crc_table, ctx->crc, (uint8_t*)(&v), 3);
|
|
}
|
|
} else {
|
|
uint8_t *crc_source;
|
|
|
|
if (swap) {
|
|
if (ctx->avctx->bits_per_raw_sample <= 16) {
|
|
int16_t *src = (int16_t*) data;
|
|
int16_t *dest = (int16_t*) ctx->crc_buffer;
|
|
for (sample = 0;
|
|
sample < ctx->cur_frame_length * avctx->channels;
|
|
sample++)
|
|
*dest++ = av_bswap16(src[sample]);
|
|
} else {
|
|
ctx->dsp.bswap_buf((uint32_t*)ctx->crc_buffer, data,
|
|
ctx->cur_frame_length * avctx->channels);
|
|
}
|
|
crc_source = ctx->crc_buffer;
|
|
} else {
|
|
crc_source = data;
|
|
}
|
|
|
|
ctx->crc = av_crc(ctx->crc_table, ctx->crc, crc_source, size);
|
|
}
|
|
|
|
|
|
// check CRC sums if this is the last frame
|
|
if (ctx->cur_frame_length != sconf->frame_length &&
|
|
ctx->crc_org != ctx->crc) {
|
|
av_log(avctx, AV_LOG_ERROR, "CRC error.\n");
|
|
}
|
|
}
|
|
|
|
|
|
bytes_read = invalid_frame ? buffer_size :
|
|
(get_bits_count(&ctx->gb) + 7) >> 3;
|
|
|
|
return bytes_read;
|
|
}
|
|
|
|
|
|
/** Uninitialize the ALS decoder.
|
|
*/
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
{
|
|
ALSDecContext *ctx = avctx->priv_data;
|
|
|
|
av_freep(&ctx->sconf.chan_pos);
|
|
|
|
ff_bgmc_end(&ctx->bgmc_lut, &ctx->bgmc_lut_status);
|
|
|
|
av_freep(&ctx->const_block);
|
|
av_freep(&ctx->shift_lsbs);
|
|
av_freep(&ctx->opt_order);
|
|
av_freep(&ctx->store_prev_samples);
|
|
av_freep(&ctx->use_ltp);
|
|
av_freep(&ctx->ltp_lag);
|
|
av_freep(&ctx->ltp_gain);
|
|
av_freep(&ctx->ltp_gain_buffer);
|
|
av_freep(&ctx->quant_cof);
|
|
av_freep(&ctx->lpc_cof);
|
|
av_freep(&ctx->quant_cof_buffer);
|
|
av_freep(&ctx->lpc_cof_buffer);
|
|
av_freep(&ctx->lpc_cof_reversed_buffer);
|
|
av_freep(&ctx->prev_raw_samples);
|
|
av_freep(&ctx->raw_samples);
|
|
av_freep(&ctx->raw_buffer);
|
|
av_freep(&ctx->chan_data);
|
|
av_freep(&ctx->chan_data_buffer);
|
|
av_freep(&ctx->reverted_channels);
|
|
av_freep(&ctx->crc_buffer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** Initialize the ALS decoder.
|
|
*/
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
unsigned int c;
|
|
unsigned int channel_size;
|
|
int num_buffers;
|
|
ALSDecContext *ctx = avctx->priv_data;
|
|
ALSSpecificConfig *sconf = &ctx->sconf;
|
|
ctx->avctx = avctx;
|
|
|
|
if (!avctx->extradata) {
|
|
av_log(avctx, AV_LOG_ERROR, "Missing required ALS extradata.\n");
|
|
return -1;
|
|
}
|
|
|
|
if (read_specific_config(ctx)) {
|
|
av_log(avctx, AV_LOG_ERROR, "Reading ALSSpecificConfig failed.\n");
|
|
decode_end(avctx);
|
|
return -1;
|
|
}
|
|
|
|
if (check_specific_config(ctx)) {
|
|
decode_end(avctx);
|
|
return -1;
|
|
}
|
|
|
|
if (sconf->bgmc)
|
|
ff_bgmc_init(avctx, &ctx->bgmc_lut, &ctx->bgmc_lut_status);
|
|
|
|
if (sconf->floating) {
|
|
avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
|
|
avctx->bits_per_raw_sample = 32;
|
|
} else {
|
|
avctx->sample_fmt = sconf->resolution > 1
|
|
? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
|
|
avctx->bits_per_raw_sample = (sconf->resolution + 1) * 8;
|
|
}
|
|
|
|
// set maximum Rice parameter for progressive decoding based on resolution
|
|
// This is not specified in 14496-3 but actually done by the reference
|
|
// codec RM22 revision 2.
|
|
ctx->s_max = sconf->resolution > 1 ? 31 : 15;
|
|
|
|
// set lag value for long-term prediction
|
|
ctx->ltp_lag_length = 8 + (avctx->sample_rate >= 96000) +
|
|
(avctx->sample_rate >= 192000);
|
|
|
|
// allocate quantized parcor coefficient buffer
|
|
num_buffers = sconf->mc_coding ? avctx->channels : 1;
|
|
|
|
ctx->quant_cof = av_malloc(sizeof(*ctx->quant_cof) * num_buffers);
|
|
ctx->lpc_cof = av_malloc(sizeof(*ctx->lpc_cof) * num_buffers);
|
|
ctx->quant_cof_buffer = av_malloc(sizeof(*ctx->quant_cof_buffer) *
|
|
num_buffers * sconf->max_order);
|
|
ctx->lpc_cof_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
|
|
num_buffers * sconf->max_order);
|
|
ctx->lpc_cof_reversed_buffer = av_malloc(sizeof(*ctx->lpc_cof_buffer) *
|
|
sconf->max_order);
|
|
|
|
if (!ctx->quant_cof || !ctx->lpc_cof ||
|
|
!ctx->quant_cof_buffer || !ctx->lpc_cof_buffer ||
|
|
!ctx->lpc_cof_reversed_buffer) {
|
|
av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
// assign quantized parcor coefficient buffers
|
|
for (c = 0; c < num_buffers; c++) {
|
|
ctx->quant_cof[c] = ctx->quant_cof_buffer + c * sconf->max_order;
|
|
ctx->lpc_cof[c] = ctx->lpc_cof_buffer + c * sconf->max_order;
|
|
}
|
|
|
|
// allocate and assign lag and gain data buffer for ltp mode
|
|
ctx->const_block = av_malloc (sizeof(*ctx->const_block) * num_buffers);
|
|
ctx->shift_lsbs = av_malloc (sizeof(*ctx->shift_lsbs) * num_buffers);
|
|
ctx->opt_order = av_malloc (sizeof(*ctx->opt_order) * num_buffers);
|
|
ctx->store_prev_samples = av_malloc(sizeof(*ctx->store_prev_samples) * num_buffers);
|
|
ctx->use_ltp = av_mallocz(sizeof(*ctx->use_ltp) * num_buffers);
|
|
ctx->ltp_lag = av_malloc (sizeof(*ctx->ltp_lag) * num_buffers);
|
|
ctx->ltp_gain = av_malloc (sizeof(*ctx->ltp_gain) * num_buffers);
|
|
ctx->ltp_gain_buffer = av_malloc (sizeof(*ctx->ltp_gain_buffer) *
|
|
num_buffers * 5);
|
|
|
|
if (!ctx->const_block || !ctx->shift_lsbs ||
|
|
!ctx->opt_order || !ctx->store_prev_samples ||
|
|
!ctx->use_ltp || !ctx->ltp_lag ||
|
|
!ctx->ltp_gain || !ctx->ltp_gain_buffer) {
|
|
av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
|
|
decode_end(avctx);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
for (c = 0; c < num_buffers; c++)
|
|
ctx->ltp_gain[c] = ctx->ltp_gain_buffer + c * 5;
|
|
|
|
// allocate and assign channel data buffer for mcc mode
|
|
if (sconf->mc_coding) {
|
|
ctx->chan_data_buffer = av_malloc(sizeof(*ctx->chan_data_buffer) *
|
|
num_buffers * num_buffers);
|
|
ctx->chan_data = av_malloc(sizeof(*ctx->chan_data) *
|
|
num_buffers);
|
|
ctx->reverted_channels = av_malloc(sizeof(*ctx->reverted_channels) *
|
|
num_buffers);
|
|
|
|
if (!ctx->chan_data_buffer || !ctx->chan_data || !ctx->reverted_channels) {
|
|
av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
|
|
decode_end(avctx);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
for (c = 0; c < num_buffers; c++)
|
|
ctx->chan_data[c] = ctx->chan_data_buffer + c * num_buffers;
|
|
} else {
|
|
ctx->chan_data = NULL;
|
|
ctx->chan_data_buffer = NULL;
|
|
ctx->reverted_channels = NULL;
|
|
}
|
|
|
|
avctx->frame_size = sconf->frame_length;
|
|
channel_size = sconf->frame_length + sconf->max_order;
|
|
|
|
ctx->prev_raw_samples = av_malloc (sizeof(*ctx->prev_raw_samples) * sconf->max_order);
|
|
ctx->raw_buffer = av_mallocz(sizeof(*ctx-> raw_buffer) * avctx->channels * channel_size);
|
|
ctx->raw_samples = av_malloc (sizeof(*ctx-> raw_samples) * avctx->channels);
|
|
|
|
// allocate previous raw sample buffer
|
|
if (!ctx->prev_raw_samples || !ctx->raw_buffer|| !ctx->raw_samples) {
|
|
av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
|
|
decode_end(avctx);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
// assign raw samples buffers
|
|
ctx->raw_samples[0] = ctx->raw_buffer + sconf->max_order;
|
|
for (c = 1; c < avctx->channels; c++)
|
|
ctx->raw_samples[c] = ctx->raw_samples[c - 1] + channel_size;
|
|
|
|
// allocate crc buffer
|
|
if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
|
|
avctx->error_recognition >= FF_ER_CAREFUL) {
|
|
ctx->crc_buffer = av_malloc(sizeof(*ctx->crc_buffer) *
|
|
ctx->cur_frame_length *
|
|
avctx->channels *
|
|
(av_get_bits_per_sample_fmt(avctx->sample_fmt) >> 3));
|
|
if (!ctx->crc_buffer) {
|
|
av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
|
|
decode_end(avctx);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
}
|
|
|
|
dsputil_init(&ctx->dsp, avctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** Flush (reset) the frame ID after seeking.
|
|
*/
|
|
static av_cold void flush(AVCodecContext *avctx)
|
|
{
|
|
ALSDecContext *ctx = avctx->priv_data;
|
|
|
|
ctx->frame_id = 0;
|
|
}
|
|
|
|
|
|
AVCodec ff_als_decoder = {
|
|
"als",
|
|
AVMEDIA_TYPE_AUDIO,
|
|
CODEC_ID_MP4ALS,
|
|
sizeof(ALSDecContext),
|
|
decode_init,
|
|
NULL,
|
|
decode_end,
|
|
decode_frame,
|
|
.flush = flush,
|
|
.capabilities = CODEC_CAP_SUBFRAMES,
|
|
.long_name = NULL_IF_CONFIG_SMALL("MPEG-4 Audio Lossless Coding (ALS)"),
|
|
};
|
|
|