985 lines
31 KiB
C
985 lines
31 KiB
C
/*
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* TAK decoder
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* Copyright (c) 2012 Paul B Mahol
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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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* TAK (Tom's lossless Audio Kompressor) decoder
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* @author Paul B Mahol
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*/
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#include "tak.h"
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#include "avcodec.h"
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#include "unary.h"
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#include "dsputil.h"
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#define MAX_SUBFRAMES 8 ///< max number of subframes per channel
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#define MAX_PREDICTORS 256
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typedef struct MCDParam {
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int8_t present; ///< is decorrelation parameters available for this channel
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int8_t index; ///< index into array of decorrelation types
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int8_t chan1;
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int8_t chan2;
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} MCDParam;
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typedef struct TAKDecContext {
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AVCodecContext *avctx; ///< parent AVCodecContext
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AVFrame frame; ///< AVFrame for decoded output
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DSPContext dsp;
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TAKStreamInfo ti;
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GetBitContext gb; ///< bitstream reader initialized to start at the current frame
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int nb_samples; ///< number of samples in the current frame
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int32_t *decode_buffer;
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int decode_buffer_size;
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int32_t *decoded[TAK_MAX_CHANNELS]; ///< decoded samples for each channel
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int8_t lpc_mode[TAK_MAX_CHANNELS];
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int8_t sample_shift[TAK_MAX_CHANNELS]; ///< shift applied to every sample in the channel
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int32_t xred;
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int size;
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int ared;
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int filter_order;
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int16_t predictors[MAX_PREDICTORS];
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int nb_subframes; ///< number of subframes in the current frame
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int16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples
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int subframe_scale;
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int8_t dmode; ///< channel decorrelation type in the current frame
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int8_t dshift;
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int16_t dfactor;
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int8_t dval1;
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int8_t dval2;
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MCDParam mcdparams[TAK_MAX_CHANNELS]; ///< multichannel decorrelation parameters
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int wlength;
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int uval;
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int rval;
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int8_t coding_mode[128];
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DECLARE_ALIGNED(16, int16_t, filter)[MAX_PREDICTORS];
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DECLARE_ALIGNED(16, int16_t, residues)[544];
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} TAKDecContext;
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static const int8_t mc_dmodes[] = {
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1, 3, 4, 6,
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};
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static const uint16_t predictor_sizes[] = {
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4, 8, 12, 16, 24, 32, 48, 64, 80, 96, 128, 160, 192, 224, 256, 0,
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};
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static const struct CParam {
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int init;
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int escape;
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int scale;
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int aescape;
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int bias;
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} xcodes[50] = {
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{ 0x01, 0x0000001, 0x0000001, 0x0000003, 0x0000008 },
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{ 0x02, 0x0000003, 0x0000001, 0x0000007, 0x0000006 },
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{ 0x03, 0x0000005, 0x0000002, 0x000000E, 0x000000D },
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{ 0x03, 0x0000003, 0x0000003, 0x000000D, 0x0000018 },
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{ 0x04, 0x000000B, 0x0000004, 0x000001C, 0x0000019 },
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{ 0x04, 0x0000006, 0x0000006, 0x000001A, 0x0000030 },
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{ 0x05, 0x0000016, 0x0000008, 0x0000038, 0x0000032 },
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{ 0x05, 0x000000C, 0x000000C, 0x0000034, 0x0000060 },
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{ 0x06, 0x000002C, 0x0000010, 0x0000070, 0x0000064 },
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{ 0x06, 0x0000018, 0x0000018, 0x0000068, 0x00000C0 },
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{ 0x07, 0x0000058, 0x0000020, 0x00000E0, 0x00000C8 },
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{ 0x07, 0x0000030, 0x0000030, 0x00000D0, 0x0000180 },
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{ 0x08, 0x00000B0, 0x0000040, 0x00001C0, 0x0000190 },
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{ 0x08, 0x0000060, 0x0000060, 0x00001A0, 0x0000300 },
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{ 0x09, 0x0000160, 0x0000080, 0x0000380, 0x0000320 },
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{ 0x09, 0x00000C0, 0x00000C0, 0x0000340, 0x0000600 },
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{ 0x0A, 0x00002C0, 0x0000100, 0x0000700, 0x0000640 },
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{ 0x0A, 0x0000180, 0x0000180, 0x0000680, 0x0000C00 },
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{ 0x0B, 0x0000580, 0x0000200, 0x0000E00, 0x0000C80 },
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{ 0x0B, 0x0000300, 0x0000300, 0x0000D00, 0x0001800 },
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{ 0x0C, 0x0000B00, 0x0000400, 0x0001C00, 0x0001900 },
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{ 0x0C, 0x0000600, 0x0000600, 0x0001A00, 0x0003000 },
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{ 0x0D, 0x0001600, 0x0000800, 0x0003800, 0x0003200 },
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{ 0x0D, 0x0000C00, 0x0000C00, 0x0003400, 0x0006000 },
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{ 0x0E, 0x0002C00, 0x0001000, 0x0007000, 0x0006400 },
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{ 0x0E, 0x0001800, 0x0001800, 0x0006800, 0x000C000 },
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{ 0x0F, 0x0005800, 0x0002000, 0x000E000, 0x000C800 },
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{ 0x0F, 0x0003000, 0x0003000, 0x000D000, 0x0018000 },
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{ 0x10, 0x000B000, 0x0004000, 0x001C000, 0x0019000 },
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{ 0x10, 0x0006000, 0x0006000, 0x001A000, 0x0030000 },
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{ 0x11, 0x0016000, 0x0008000, 0x0038000, 0x0032000 },
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{ 0x11, 0x000C000, 0x000C000, 0x0034000, 0x0060000 },
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{ 0x12, 0x002C000, 0x0010000, 0x0070000, 0x0064000 },
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{ 0x12, 0x0018000, 0x0018000, 0x0068000, 0x00C0000 },
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{ 0x13, 0x0058000, 0x0020000, 0x00E0000, 0x00C8000 },
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{ 0x13, 0x0030000, 0x0030000, 0x00D0000, 0x0180000 },
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{ 0x14, 0x00B0000, 0x0040000, 0x01C0000, 0x0190000 },
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{ 0x14, 0x0060000, 0x0060000, 0x01A0000, 0x0300000 },
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{ 0x15, 0x0160000, 0x0080000, 0x0380000, 0x0320000 },
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{ 0x15, 0x00C0000, 0x00C0000, 0x0340000, 0x0600000 },
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{ 0x16, 0x02C0000, 0x0100000, 0x0700000, 0x0640000 },
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{ 0x16, 0x0180000, 0x0180000, 0x0680000, 0x0C00000 },
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{ 0x17, 0x0580000, 0x0200000, 0x0E00000, 0x0C80000 },
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{ 0x17, 0x0300000, 0x0300000, 0x0D00000, 0x1800000 },
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{ 0x18, 0x0B00000, 0x0400000, 0x1C00000, 0x1900000 },
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{ 0x18, 0x0600000, 0x0600000, 0x1A00000, 0x3000000 },
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{ 0x19, 0x1600000, 0x0800000, 0x3800000, 0x3200000 },
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{ 0x19, 0x0C00000, 0x0C00000, 0x3400000, 0x6000000 },
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{ 0x1A, 0x2C00000, 0x1000000, 0x7000000, 0x6400000 },
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{ 0x1A, 0x1800000, 0x1800000, 0x6800000, 0xC000000 },
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};
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static int tak_set_bps(AVCodecContext *avctx, int bps)
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{
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switch (bps) {
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case 8:
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avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
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break;
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case 16:
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avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
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break;
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case 24:
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avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "invalid/unsupported bits per sample\n");
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return AVERROR_INVALIDDATA;
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}
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return 0;
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}
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static int get_shift(int sample_rate)
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{
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int shift;
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if (sample_rate < 11025)
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shift = 3;
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else if (sample_rate < 22050)
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shift = 2;
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else if (sample_rate < 44100)
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shift = 1;
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else
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shift = 0;
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return shift;
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}
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static int get_scale(int sample_rate, int shift)
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{
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return FFALIGN(sample_rate + 511 >> 9, 4) << shift;
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}
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static av_cold int tak_decode_init(AVCodecContext *avctx)
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{
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TAKDecContext *s = avctx->priv_data;
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int ret;
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ff_tak_init_crc();
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ff_dsputil_init(&s->dsp, avctx);
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s->avctx = avctx;
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avcodec_get_frame_defaults(&s->frame);
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avctx->coded_frame = &s->frame;
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s->uval = get_scale(avctx->sample_rate, get_shift(avctx->sample_rate));
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s->subframe_scale = get_scale(avctx->sample_rate, 1);
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if ((ret = tak_set_bps(avctx, avctx->bits_per_coded_sample)) < 0)
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return ret;
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return 0;
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}
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static int get_code(GetBitContext *gb, int nbits)
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{
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if (nbits == 1) {
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skip_bits1(gb);
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return 0;
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} else {
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return get_sbits(gb, nbits);
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}
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}
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static void decode_lpc(int32_t *coeffs, int mode, int length)
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{
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int i, a1, a2, a3, a4, a5;
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if (length < 2)
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return;
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if (mode == 1) {
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a1 = *coeffs++;
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for (i = 0; i < (length - 1 >> 1); i++) {
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*coeffs += a1;
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coeffs[1] += *coeffs;
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a1 = coeffs[1];
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coeffs += 2;
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}
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if ((length - 1) & 1)
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*coeffs += a1;
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} else if (mode == 2) {
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a1 = coeffs[1];
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a2 = a1 + *coeffs;
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coeffs[1] = a2;
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if (length > 2) {
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coeffs += 2;
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for (i = 0; i < (length - 2 >> 1); i++) {
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a3 = *coeffs + a1;
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a4 = a3 + a2;
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*coeffs = a4;
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a1 = coeffs[1] + a3;
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a2 = a1 + a4;
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coeffs[1] = a2;
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coeffs += 2;
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}
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if (length & 1)
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*coeffs += a1 + a2;
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}
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} else if (mode == 3) {
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a1 = coeffs[1];
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a2 = a1 + *coeffs;
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coeffs[1] = a2;
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if (length > 2) {
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a3 = coeffs[2];
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a4 = a3 + a1;
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a5 = a4 + a2;
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coeffs += 3;
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for (i = 0; i < length - 3; i++) {
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a3 += *coeffs;
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a4 += a3;
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a5 += a4;
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*coeffs = a5;
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coeffs++;
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}
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}
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}
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}
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static int decode_segment(TAKDecContext *s, int8_t value, int32_t *dst, int len)
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{
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GetBitContext *gb = &s->gb;
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if (!value) {
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memset(dst, 0, len * 4);
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} else {
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int x, y, z, i = 0;
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value--;
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do {
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while (1) {
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x = get_bits_long(gb, xcodes[value].init);
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if (x >= xcodes[value].escape)
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break;
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dst[i++] = (x >> 1) ^ -(x & 1);
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if (i >= len)
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return 0;
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}
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y = get_bits1(gb);
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x = (y << xcodes[value].init) | x;
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if (x >= xcodes[value].aescape) {
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int c = get_unary(gb, 1, 9);
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if (c == 9) {
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int d;
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z = x + xcodes[value].bias;
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d = get_bits(gb, 3);
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if (d == 7) {
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d = get_bits(gb, 5) + 7;
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if (d > 29)
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return AVERROR_INVALIDDATA;
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}
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if (d)
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z += xcodes[value].scale * (get_bits_long(gb, d) + 1);
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} else {
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z = xcodes[value].scale * c + x - xcodes[value].escape;
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}
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} else {
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z = x - (xcodes[value].escape & -y);
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}
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dst[i++] = (z >> 1) ^ -(z & 1);
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} while (i < len);
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}
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return 0;
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}
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static int xget(TAKDecContext *s, int d, int q)
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{
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int x;
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x = d / q;
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s->rval = d - (x * q);
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if (s->rval < q / 2) {
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s->rval += q;
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} else {
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x++;
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}
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if (x <= 1 || x > 128)
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return -1;
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return x;
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}
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static int get_len(TAKDecContext *s, int b)
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{
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if (b >= s->wlength - 1)
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return s->rval;
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else
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return s->uval;
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}
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static int decode_coeffs(TAKDecContext *s, int32_t *dst, int length)
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{
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GetBitContext *gb = &s->gb;
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int i, v, ret;
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if (length > s->nb_samples)
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return AVERROR_INVALIDDATA;
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if (get_bits1(gb)) {
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if ((s->wlength = xget(s, length, s->uval)) < 0)
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return AVERROR_INVALIDDATA;
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s->coding_mode[0] = v = get_bits(gb, 6);
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if (s->coding_mode[0] > FF_ARRAY_ELEMS(xcodes))
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return AVERROR_INVALIDDATA;
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for (i = 1; i < s->wlength; i++) {
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int c = get_unary(gb, 1, 6);
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if (c > 5) {
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v = get_bits(gb, 6);
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} else if (c > 2) {
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int t = get_bits1(gb);
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v += (-t ^ (c - 1)) + t;
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} else {
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v += (-(c & 1) ^ (((c & 1) + c) >> 1)) + (c & 1);
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}
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if (v > FF_ARRAY_ELEMS(xcodes))
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return AVERROR_INVALIDDATA;
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s->coding_mode[i] = v;
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}
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i = 0;
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while (i < s->wlength) {
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int len = 0;
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v = s->coding_mode[i];
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do {
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len += get_len(s, i);
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i++;
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if (i == s->wlength)
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break;
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} while (v == s->coding_mode[i]);
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if ((ret = decode_segment(s, v, dst, len)) < 0)
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return ret;
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dst += len;
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}
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} else {
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v = get_bits(gb, 6);
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if (v > FF_ARRAY_ELEMS(xcodes))
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return AVERROR_INVALIDDATA;
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if ((ret = decode_segment(s, v, dst, length)) < 0)
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return ret;
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}
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return 0;
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}
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static int get_b(GetBitContext *gb)
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{
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if (get_bits1(gb))
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return get_bits(gb, 4) + 1;
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else
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return 0;
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}
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static int decode_subframe(TAKDecContext *s, int32_t *ptr, int subframe_size,
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int prev_subframe_size)
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{
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GetBitContext *gb = &s->gb;
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int tmp, x, y, i, j, ret = 0;
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int tfilter[MAX_PREDICTORS];
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if (get_bits1(gb)) {
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s->filter_order = predictor_sizes[get_bits(gb, 4)];
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if (prev_subframe_size > 0 && get_bits1(gb)) {
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if (s->filter_order > prev_subframe_size)
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return AVERROR_INVALIDDATA;
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ptr -= s->filter_order;
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subframe_size += s->filter_order;
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if (s->filter_order > subframe_size)
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return AVERROR_INVALIDDATA;
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} else {
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int lpc;
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if (s->filter_order > subframe_size)
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return AVERROR_INVALIDDATA;
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lpc = get_bits(gb, 2);
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if (lpc > 2)
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return AVERROR_INVALIDDATA;
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if ((ret = decode_coeffs(s, ptr, s->filter_order)) < 0)
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return ret;
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decode_lpc(ptr, lpc, s->filter_order);
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}
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s->xred = get_b(gb);
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s->size = get_bits1(gb) + 5;
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if (get_bits1(gb)) {
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s->ared = get_bits(gb, 3) + 1;
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if (s->ared > 7)
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return AVERROR_INVALIDDATA;
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} else {
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s->ared = 0;
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}
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s->predictors[0] = get_code(gb, 10);
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s->predictors[1] = get_code(gb, 10);
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s->predictors[2] = get_code(gb, s->size + 1) << (9 - s->size);
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s->predictors[3] = get_code(gb, s->size + 1) << (9 - s->size);
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if (s->filter_order > 4) {
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tmp = s->size + 1 - get_bits1(gb);
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for (i = 4; i < s->filter_order; i++) {
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if (!(i & 3))
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x = tmp - get_bits(gb, 2);
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|
s->predictors[i] = get_code(gb, x) << (9 - s->size);
|
|
}
|
|
}
|
|
|
|
tfilter[0] = s->predictors[0] << 6;
|
|
for (i = 1; i < s->filter_order; i++) {
|
|
int32_t *p1 = &tfilter[0];
|
|
int32_t *p2 = &tfilter[i - 1];
|
|
|
|
for (j = 0; j < (i + 1) / 2; j++) {
|
|
x = *p1 + (s->predictors[i] * *p2 + 256 >> 9);
|
|
*p2 += s->predictors[i] * *p1 + 256 >> 9;
|
|
*p1++ = x;
|
|
p2--;
|
|
}
|
|
|
|
tfilter[i] = s->predictors[i] << 6;
|
|
}
|
|
|
|
x = -1 << (32 - (s->ared + 5));
|
|
y = 1 << ((s->ared + 5) - 1);
|
|
for (i = 0, j = s->filter_order - 1; i < s->filter_order / 2; i++, j--) {
|
|
tmp = y + tfilter[j];
|
|
s->filter[j] = -(x & -(y + tfilter[i] >> 31) |
|
|
(y + tfilter[i]) >> (s->ared + 5));
|
|
s->filter[i] = -(x & -(tmp >> 31) | (tmp >> s->ared + 5));
|
|
}
|
|
|
|
if ((ret = decode_coeffs(s, &ptr[s->filter_order],
|
|
subframe_size - s->filter_order)) < 0)
|
|
return ret;
|
|
|
|
for (i = 0; i < s->filter_order; i++)
|
|
s->residues[i] = *ptr++ >> s->xred;
|
|
|
|
y = FF_ARRAY_ELEMS(s->residues) - s->filter_order;
|
|
x = subframe_size - s->filter_order;
|
|
while (x > 0) {
|
|
tmp = FFMIN(y, x);
|
|
|
|
for (i = 0; i < tmp; i++) {
|
|
int v, w, m;
|
|
|
|
v = 1 << (10 - s->ared - 1);
|
|
if (!(s->filter_order & 15)) {
|
|
v += s->dsp.scalarproduct_int16(&s->residues[i], s->filter,
|
|
s->filter_order);
|
|
} else if (s->filter_order & 4) {
|
|
for (j = 0; j < s->filter_order; j += 4) {
|
|
v += s->residues[i + j + 3] * s->filter[j + 3] +
|
|
s->residues[i + j + 2] * s->filter[j + 2] +
|
|
s->residues[i + j + 1] * s->filter[j + 1] +
|
|
s->residues[i + j ] * s->filter[j ];
|
|
}
|
|
} else {
|
|
for (j = 0; j < s->filter_order; j += 8) {
|
|
v += s->residues[i + j + 7] * s->filter[j + 7] +
|
|
s->residues[i + j + 6] * s->filter[j + 6] +
|
|
s->residues[i + j + 5] * s->filter[j + 5] +
|
|
s->residues[i + j + 4] * s->filter[j + 4] +
|
|
s->residues[i + j + 3] * s->filter[j + 3] +
|
|
s->residues[i + j + 2] * s->filter[j + 2] +
|
|
s->residues[i + j + 1] * s->filter[j + 1] +
|
|
s->residues[i + j ] * s->filter[j ];
|
|
}
|
|
}
|
|
m = (-1 << (32 - (10 - s->ared))) & -(v >> 31) | (v >> 10 - s->ared);
|
|
m = av_clip(m, -8192, 8191);
|
|
w = (m << s->xred) - *ptr;
|
|
*ptr++ = w;
|
|
s->residues[s->filter_order + i] = w >> s->xred;
|
|
}
|
|
|
|
x -= tmp;
|
|
if (x > 0)
|
|
memcpy(s->residues, &s->residues[y], 2 * s->filter_order);
|
|
}
|
|
|
|
emms_c();
|
|
} else {
|
|
ret = decode_coeffs(s, ptr, subframe_size);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int decode_channel(TAKDecContext *s, int chan)
|
|
{
|
|
AVCodecContext *avctx = s->avctx;
|
|
GetBitContext *gb = &s->gb;
|
|
int32_t *dst = s->decoded[chan];
|
|
int i = 0, ret, prev = 0;
|
|
int left = s->nb_samples - 1;
|
|
|
|
s->sample_shift[chan] = get_b(gb);
|
|
if (s->sample_shift[chan] >= avctx->bits_per_raw_sample)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
*dst++ = get_code(gb, avctx->bits_per_raw_sample - s->sample_shift[chan]);
|
|
s->lpc_mode[chan] = get_bits(gb, 2);
|
|
s->nb_subframes = get_bits(gb, 3) + 1;
|
|
|
|
if (s->nb_subframes > 1) {
|
|
if (get_bits_left(gb) < (s->nb_subframes - 1) * 6)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
for (; i < s->nb_subframes - 1; i++) {
|
|
int v = get_bits(gb, 6);
|
|
|
|
s->subframe_len[i] = (v - prev) * s->subframe_scale;
|
|
if (s->subframe_len[i] <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
left -= s->subframe_len[i];
|
|
prev = v;
|
|
}
|
|
|
|
if (left <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
s->subframe_len[i] = left;
|
|
prev = 0;
|
|
for (i = 0; i < s->nb_subframes; i++) {
|
|
if ((ret = decode_subframe(s, dst, s->subframe_len[i], prev)) < 0)
|
|
return ret;
|
|
dst += s->subframe_len[i];
|
|
prev = s->subframe_len[i];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
|
|
{
|
|
GetBitContext *gb = &s->gb;
|
|
uint32_t *p1 = s->decoded[c1] + 1;
|
|
uint32_t *p2 = s->decoded[c2] + 1;
|
|
int a, b, i, x, tmp;
|
|
|
|
if (s->dmode > 3) {
|
|
s->dshift = get_b(gb);
|
|
if (s->dmode > 5) {
|
|
if (get_bits1(gb))
|
|
s->filter_order = 16;
|
|
else
|
|
s->filter_order = 8;
|
|
|
|
s->dval1 = get_bits1(gb);
|
|
s->dval2 = get_bits1(gb);
|
|
|
|
for (i = 0; i < s->filter_order; i++) {
|
|
if (!(i & 3))
|
|
x = 14 - get_bits(gb, 3);
|
|
s->filter[i] = get_code(gb, x);
|
|
}
|
|
} else {
|
|
s->dfactor = get_code(gb, 10);
|
|
}
|
|
}
|
|
|
|
switch (s->dmode) {
|
|
case 1:
|
|
for (i = 0; i < length; i++, p1++, p2++)
|
|
*p2 += *p1;
|
|
break;
|
|
case 2:
|
|
for (i = 0; i < length; i++, p1++, p2++)
|
|
*p1 = *p2 - *p1;
|
|
break;
|
|
case 3:
|
|
for (i = 0; i < length; i++, p1++, p2++) {
|
|
x = (*p2 & 1) + 2 * *p1;
|
|
a = -*p2 + x;
|
|
b = *p2 + x;
|
|
*p1 = a & 0x80000000 | (a >> 1);
|
|
*p2 = b & 0x80000000 | (b >> 1);
|
|
}
|
|
break;
|
|
case 4:
|
|
FFSWAP(uint32_t *, p1, p2);
|
|
case 5:
|
|
if (s->dshift)
|
|
tmp = -1 << (32 - s->dshift);
|
|
else
|
|
tmp = 0;
|
|
|
|
for (i = 0; i < length; i++, p1++, p2++) {
|
|
x = s->dfactor * (tmp & -(*p2 >> 31) | (*p2 >> s->dshift)) + 128;
|
|
*p1 = ((-(x >> 31) & 0xFF000000 | (x >> 8)) << s->dshift) - *p1;
|
|
}
|
|
break;
|
|
case 6:
|
|
FFSWAP(uint32_t *, p1, p2);
|
|
case 7:
|
|
if (length < 256)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
a = s->filter_order / 2;
|
|
b = length - (s->filter_order - 1);
|
|
|
|
if (s->dval1) {
|
|
for (i = 0; i < a; i++)
|
|
p1[i] += p2[i];
|
|
}
|
|
|
|
if (s->dval2) {
|
|
x = a + b;
|
|
for (i = 0; i < length - x; i++)
|
|
p1[x + i] += p2[x + i];
|
|
}
|
|
|
|
for (i = 0; i < s->filter_order; i++)
|
|
s->residues[i] = *p2++ >> s->dshift;
|
|
|
|
p1 += a;
|
|
x = FF_ARRAY_ELEMS(s->residues) - s->filter_order;
|
|
for (; b > 0; b -= tmp) {
|
|
tmp = FFMIN(b, x);
|
|
|
|
for (i = 0; i < tmp; i++)
|
|
s->residues[s->filter_order + i] = *p2++ >> s->dshift;
|
|
|
|
for (i = 0; i < tmp; i++) {
|
|
int v, w, m;
|
|
|
|
v = 1 << 9;
|
|
|
|
if (s->filter_order == 16) {
|
|
v += s->dsp.scalarproduct_int16(&s->residues[i], s->filter,
|
|
s->filter_order);
|
|
} else {
|
|
v += s->residues[i + 7] * s->filter[7] +
|
|
s->residues[i + 6] * s->filter[6] +
|
|
s->residues[i + 5] * s->filter[5] +
|
|
s->residues[i + 4] * s->filter[4] +
|
|
s->residues[i + 3] * s->filter[3] +
|
|
s->residues[i + 2] * s->filter[2] +
|
|
s->residues[i + 1] * s->filter[1] +
|
|
s->residues[i ] * s->filter[0];
|
|
}
|
|
|
|
m = (-1 << 22) & -(v >> 31) | (v >> 10);
|
|
m = av_clip(m, -8192, 8191);
|
|
w = (m << s->dshift) - *p1;
|
|
*p1++ = w;
|
|
}
|
|
|
|
memcpy(s->residues, &s->residues[tmp], 2 * s->filter_order);
|
|
}
|
|
|
|
emms_c();
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tak_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame_ptr, AVPacket *pkt)
|
|
{
|
|
TAKDecContext *s = avctx->priv_data;
|
|
GetBitContext *gb = &s->gb;
|
|
int chan, i, ret, hsize;
|
|
int32_t *p;
|
|
|
|
if (pkt->size < TAK_MIN_FRAME_HEADER_BYTES)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
init_get_bits(gb, pkt->data, pkt->size * 8);
|
|
|
|
if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0)
|
|
return ret;
|
|
|
|
if (avctx->err_recognition & AV_EF_CRCCHECK) {
|
|
hsize = get_bits_count(gb) / 8;
|
|
if (ff_tak_check_crc(pkt->data, hsize)) {
|
|
av_log(avctx, AV_LOG_ERROR, "CRC error\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
|
|
if (s->ti.codec != 2 && s->ti.codec != 4) {
|
|
av_log(avctx, AV_LOG_ERROR, "unsupported codec: %d\n", s->ti.codec);
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
if (s->ti.data_type) {
|
|
av_log(avctx, AV_LOG_ERROR, "unsupported data type: %d\n", s->ti.data_type);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (s->ti.codec == 2 && s->ti.channels > 2) {
|
|
av_log(avctx, AV_LOG_ERROR, "invalid number of channels: %d\n", s->ti.channels);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (s->ti.channels > 6) {
|
|
av_log(avctx, AV_LOG_ERROR, "unsupported number of channels: %d\n", s->ti.channels);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (s->ti.frame_samples <= 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of samples\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (s->ti.bps != avctx->bits_per_raw_sample) {
|
|
avctx->bits_per_raw_sample = s->ti.bps;
|
|
if ((ret = tak_set_bps(avctx, avctx->bits_per_raw_sample)) < 0)
|
|
return ret;
|
|
}
|
|
if (s->ti.sample_rate != avctx->sample_rate) {
|
|
avctx->sample_rate = s->ti.sample_rate;
|
|
s->uval = get_scale(avctx->sample_rate, get_shift(avctx->sample_rate));
|
|
s->subframe_scale = get_scale(avctx->sample_rate, 1);
|
|
}
|
|
if (s->ti.ch_layout)
|
|
avctx->channel_layout = s->ti.ch_layout;
|
|
avctx->channels = s->ti.channels;
|
|
|
|
s->nb_samples = s->ti.last_frame_samples ? s->ti.last_frame_samples :
|
|
s->ti.frame_samples;
|
|
|
|
s->frame.nb_samples = s->nb_samples;
|
|
if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0)
|
|
return ret;
|
|
|
|
if (avctx->bits_per_raw_sample <= 16) {
|
|
av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size,
|
|
sizeof(*s->decode_buffer) * FFALIGN(s->nb_samples, 8) *
|
|
avctx->channels + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!s->decode_buffer)
|
|
return AVERROR(ENOMEM);
|
|
for (chan = 0; chan < avctx->channels; chan++)
|
|
s->decoded[chan] = s->decode_buffer +
|
|
chan * FFALIGN(s->nb_samples, 8);
|
|
} else {
|
|
for (chan = 0; chan < avctx->channels; chan++)
|
|
s->decoded[chan] = (int32_t *)s->frame.data[chan];
|
|
}
|
|
|
|
if (s->nb_samples < 16) {
|
|
for (chan = 0; chan < avctx->channels; chan++) {
|
|
p = s->decoded[chan];
|
|
for (i = 0; i < s->nb_samples; i++)
|
|
*p++ = get_code(gb, avctx->bits_per_raw_sample);
|
|
}
|
|
} else {
|
|
if (s->ti.codec == 2) {
|
|
for (chan = 0; chan < avctx->channels; chan++) {
|
|
if (ret = decode_channel(s, chan))
|
|
return ret;
|
|
}
|
|
|
|
if (avctx->channels == 2) {
|
|
s->nb_subframes = get_bits(gb, 1) + 1;
|
|
if (s->nb_subframes > 1)
|
|
s->subframe_len[1] = get_bits(gb, 6);
|
|
|
|
s->dmode = get_bits(gb, 3);
|
|
if (ret = decorrelate(s, 0, 1, s->nb_samples - 1))
|
|
return ret;
|
|
}
|
|
} else if (s->ti.codec == 4) {
|
|
if (get_bits1(gb)) {
|
|
int ch_mask = 0;
|
|
|
|
chan = get_bits(gb, 4) + 1;
|
|
if (chan > avctx->channels)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
for (i = 0; i < chan; i++) {
|
|
int nbit = get_bits(gb, 4);
|
|
|
|
if (nbit >= avctx->channels)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (ch_mask & 1 << nbit)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
s->mcdparams[i].present = get_bits1(gb);
|
|
if (s->mcdparams[i].present) {
|
|
s->mcdparams[i].index = get_bits(gb, 2);
|
|
s->mcdparams[i].chan2 = get_bits(gb, 4);
|
|
if (s->mcdparams[i].index == 1) {
|
|
if ((nbit == s->mcdparams[i].chan2) ||
|
|
(ch_mask & 1 << s->mcdparams[i].chan2))
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
ch_mask |= 1 << s->mcdparams[i].chan2;
|
|
} else if (!(ch_mask & 1 << s->mcdparams[i].chan2)) {
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
s->mcdparams[i].chan1 = nbit;
|
|
|
|
ch_mask |= 1 << nbit;
|
|
}
|
|
} else {
|
|
chan = avctx->channels;
|
|
for (i = 0; i < chan; i++) {
|
|
s->mcdparams[i].present = 0;
|
|
s->mcdparams[i].chan1 = i;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < chan; i++) {
|
|
if (s->mcdparams[i].present && s->mcdparams[i].index == 1) {
|
|
if (ret = decode_channel(s, s->mcdparams[i].chan2))
|
|
return ret;
|
|
}
|
|
|
|
if (ret = decode_channel(s, s->mcdparams[i].chan1))
|
|
return ret;
|
|
|
|
if (s->mcdparams[i].present) {
|
|
s->dmode = mc_dmodes[s->mcdparams[i].index];
|
|
if (ret = decorrelate(s, s->mcdparams[i].chan2,
|
|
s->mcdparams[i].chan1,
|
|
s->nb_samples - 1))
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (chan = 0; chan < avctx->channels; chan++) {
|
|
p = s->decoded[chan];
|
|
decode_lpc(p, s->lpc_mode[chan], s->nb_samples);
|
|
|
|
if (s->sample_shift[chan] > 0) {
|
|
for (i = 0; i < s->nb_samples; i++)
|
|
*p++ <<= s->sample_shift[chan];
|
|
}
|
|
}
|
|
}
|
|
|
|
align_get_bits(gb);
|
|
skip_bits(gb, 24);
|
|
if (get_bits_left(gb) < 0)
|
|
av_log(avctx, AV_LOG_DEBUG, "overread\n");
|
|
else if (get_bits_left(gb) > 0)
|
|
av_log(avctx, AV_LOG_DEBUG, "underread\n");
|
|
|
|
if (avctx->err_recognition & AV_EF_CRCCHECK) {
|
|
if (ff_tak_check_crc(pkt->data + hsize,
|
|
get_bits_count(gb) / 8 - hsize)) {
|
|
av_log(avctx, AV_LOG_ERROR, "CRC error\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
|
|
// convert to output buffer
|
|
switch (avctx->bits_per_raw_sample) {
|
|
case 8:
|
|
for (chan = 0; chan < avctx->channels; chan++) {
|
|
uint8_t *samples = (uint8_t *)s->frame.data[chan];
|
|
p = s->decoded[chan];
|
|
for (i = 0; i < s->nb_samples; i++, p++)
|
|
*samples++ = *p + 0x80;
|
|
}
|
|
break;
|
|
case 16:
|
|
for (chan = 0; chan < avctx->channels; chan++) {
|
|
int16_t *samples = (int16_t *)s->frame.data[chan];
|
|
p = s->decoded[chan];
|
|
for (i = 0; i < s->nb_samples; i++, p++)
|
|
*samples++ = *p;
|
|
}
|
|
break;
|
|
case 24:
|
|
for (chan = 0; chan < avctx->channels; chan++) {
|
|
int32_t *samples = (int32_t *)s->frame.data[chan];
|
|
for (i = 0; i < s->nb_samples; i++)
|
|
*samples++ <<= 8;
|
|
}
|
|
break;
|
|
}
|
|
|
|
*got_frame_ptr = 1;
|
|
*(AVFrame *)data = s->frame;
|
|
|
|
return pkt->size;
|
|
}
|
|
|
|
static av_cold int tak_decode_close(AVCodecContext *avctx)
|
|
{
|
|
TAKDecContext *s = avctx->priv_data;
|
|
|
|
av_freep(&s->decode_buffer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_tak_decoder = {
|
|
.name = "tak",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_TAK,
|
|
.priv_data_size = sizeof(TAKDecContext),
|
|
.init = tak_decode_init,
|
|
.close = tak_decode_close,
|
|
.decode = tak_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("TAK (Tom's lossless Audio Kompressor)"),
|
|
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
|
|
AV_SAMPLE_FMT_S16P,
|
|
AV_SAMPLE_FMT_S32P,
|
|
AV_SAMPLE_FMT_NONE },
|
|
};
|