yading@10: /*
yading@10:  * TAK decoder
yading@10:  * Copyright (c) 2012 Paul B Mahol
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * TAK (Tom's lossless Audio Kompressor) decoder
yading@10:  * @author Paul B Mahol
yading@10:  */
yading@10: 
yading@10: #include "libavutil/internal.h"
yading@10: #include "libavutil/samplefmt.h"
yading@10: #include "tak.h"
yading@10: #include "avcodec.h"
yading@10: #include "dsputil.h"
yading@10: #include "internal.h"
yading@10: #include "unary.h"
yading@10: 
yading@10: #define MAX_SUBFRAMES     8                         ///< max number of subframes per channel
yading@10: #define MAX_PREDICTORS  256
yading@10: 
yading@10: typedef struct MCDParam {
yading@10:     int8_t present;                                 ///< decorrelation parameter availability for this channel
yading@10:     int8_t index;                                   ///< index into array of decorrelation types
yading@10:     int8_t chan1;
yading@10:     int8_t chan2;
yading@10: } MCDParam;
yading@10: 
yading@10: typedef struct TAKDecContext {
yading@10:     AVCodecContext *avctx;                          ///< parent AVCodecContext
yading@10:     DSPContext      dsp;
yading@10:     TAKStreamInfo   ti;
yading@10:     GetBitContext   gb;                             ///< bitstream reader initialized to start at the current frame
yading@10: 
yading@10:     int             uval;
yading@10:     int             nb_samples;                     ///< number of samples in the current frame
yading@10:     uint8_t        *decode_buffer;
yading@10:     unsigned int    decode_buffer_size;
yading@10:     int32_t        *decoded[TAK_MAX_CHANNELS];      ///< decoded samples for each channel
yading@10: 
yading@10:     int8_t          lpc_mode[TAK_MAX_CHANNELS];
yading@10:     int8_t          sample_shift[TAK_MAX_CHANNELS]; ///< shift applied to every sample in the channel
yading@10:     int16_t         predictors[MAX_PREDICTORS];
yading@10:     int             nb_subframes;                   ///< number of subframes in the current frame
yading@10:     int16_t         subframe_len[MAX_SUBFRAMES];    ///< subframe length in samples
yading@10:     int             subframe_scale;
yading@10: 
yading@10:     int8_t          dmode;                          ///< channel decorrelation type in the current frame
yading@10: 
yading@10:     MCDParam        mcdparams[TAK_MAX_CHANNELS];    ///< multichannel decorrelation parameters
yading@10: 
yading@10:     int8_t          coding_mode[128];
yading@10:     DECLARE_ALIGNED(16, int16_t, filter)[MAX_PREDICTORS];
yading@10:     DECLARE_ALIGNED(16, int16_t, residues)[544];
yading@10: } TAKDecContext;
yading@10: 
yading@10: static const int8_t mc_dmodes[] = { 1, 3, 4, 6, };
yading@10: 
yading@10: static const uint16_t predictor_sizes[] = {
yading@10:     4, 8, 12, 16, 24, 32, 48, 64, 80, 96, 128, 160, 192, 224, 256, 0,
yading@10: };
yading@10: 
yading@10: static const struct CParam {
yading@10:     int init;
yading@10:     int escape;
yading@10:     int scale;
yading@10:     int aescape;
yading@10:     int bias;
yading@10: } xcodes[50] = {
yading@10:     { 0x01, 0x0000001, 0x0000001, 0x0000003, 0x0000008 },
yading@10:     { 0x02, 0x0000003, 0x0000001, 0x0000007, 0x0000006 },
yading@10:     { 0x03, 0x0000005, 0x0000002, 0x000000E, 0x000000D },
yading@10:     { 0x03, 0x0000003, 0x0000003, 0x000000D, 0x0000018 },
yading@10:     { 0x04, 0x000000B, 0x0000004, 0x000001C, 0x0000019 },
yading@10:     { 0x04, 0x0000006, 0x0000006, 0x000001A, 0x0000030 },
yading@10:     { 0x05, 0x0000016, 0x0000008, 0x0000038, 0x0000032 },
yading@10:     { 0x05, 0x000000C, 0x000000C, 0x0000034, 0x0000060 },
yading@10:     { 0x06, 0x000002C, 0x0000010, 0x0000070, 0x0000064 },
yading@10:     { 0x06, 0x0000018, 0x0000018, 0x0000068, 0x00000C0 },
yading@10:     { 0x07, 0x0000058, 0x0000020, 0x00000E0, 0x00000C8 },
yading@10:     { 0x07, 0x0000030, 0x0000030, 0x00000D0, 0x0000180 },
yading@10:     { 0x08, 0x00000B0, 0x0000040, 0x00001C0, 0x0000190 },
yading@10:     { 0x08, 0x0000060, 0x0000060, 0x00001A0, 0x0000300 },
yading@10:     { 0x09, 0x0000160, 0x0000080, 0x0000380, 0x0000320 },
yading@10:     { 0x09, 0x00000C0, 0x00000C0, 0x0000340, 0x0000600 },
yading@10:     { 0x0A, 0x00002C0, 0x0000100, 0x0000700, 0x0000640 },
yading@10:     { 0x0A, 0x0000180, 0x0000180, 0x0000680, 0x0000C00 },
yading@10:     { 0x0B, 0x0000580, 0x0000200, 0x0000E00, 0x0000C80 },
yading@10:     { 0x0B, 0x0000300, 0x0000300, 0x0000D00, 0x0001800 },
yading@10:     { 0x0C, 0x0000B00, 0x0000400, 0x0001C00, 0x0001900 },
yading@10:     { 0x0C, 0x0000600, 0x0000600, 0x0001A00, 0x0003000 },
yading@10:     { 0x0D, 0x0001600, 0x0000800, 0x0003800, 0x0003200 },
yading@10:     { 0x0D, 0x0000C00, 0x0000C00, 0x0003400, 0x0006000 },
yading@10:     { 0x0E, 0x0002C00, 0x0001000, 0x0007000, 0x0006400 },
yading@10:     { 0x0E, 0x0001800, 0x0001800, 0x0006800, 0x000C000 },
yading@10:     { 0x0F, 0x0005800, 0x0002000, 0x000E000, 0x000C800 },
yading@10:     { 0x0F, 0x0003000, 0x0003000, 0x000D000, 0x0018000 },
yading@10:     { 0x10, 0x000B000, 0x0004000, 0x001C000, 0x0019000 },
yading@10:     { 0x10, 0x0006000, 0x0006000, 0x001A000, 0x0030000 },
yading@10:     { 0x11, 0x0016000, 0x0008000, 0x0038000, 0x0032000 },
yading@10:     { 0x11, 0x000C000, 0x000C000, 0x0034000, 0x0060000 },
yading@10:     { 0x12, 0x002C000, 0x0010000, 0x0070000, 0x0064000 },
yading@10:     { 0x12, 0x0018000, 0x0018000, 0x0068000, 0x00C0000 },
yading@10:     { 0x13, 0x0058000, 0x0020000, 0x00E0000, 0x00C8000 },
yading@10:     { 0x13, 0x0030000, 0x0030000, 0x00D0000, 0x0180000 },
yading@10:     { 0x14, 0x00B0000, 0x0040000, 0x01C0000, 0x0190000 },
yading@10:     { 0x14, 0x0060000, 0x0060000, 0x01A0000, 0x0300000 },
yading@10:     { 0x15, 0x0160000, 0x0080000, 0x0380000, 0x0320000 },
yading@10:     { 0x15, 0x00C0000, 0x00C0000, 0x0340000, 0x0600000 },
yading@10:     { 0x16, 0x02C0000, 0x0100000, 0x0700000, 0x0640000 },
yading@10:     { 0x16, 0x0180000, 0x0180000, 0x0680000, 0x0C00000 },
yading@10:     { 0x17, 0x0580000, 0x0200000, 0x0E00000, 0x0C80000 },
yading@10:     { 0x17, 0x0300000, 0x0300000, 0x0D00000, 0x1800000 },
yading@10:     { 0x18, 0x0B00000, 0x0400000, 0x1C00000, 0x1900000 },
yading@10:     { 0x18, 0x0600000, 0x0600000, 0x1A00000, 0x3000000 },
yading@10:     { 0x19, 0x1600000, 0x0800000, 0x3800000, 0x3200000 },
yading@10:     { 0x19, 0x0C00000, 0x0C00000, 0x3400000, 0x6000000 },
yading@10:     { 0x1A, 0x2C00000, 0x1000000, 0x7000000, 0x6400000 },
yading@10:     { 0x1A, 0x1800000, 0x1800000, 0x6800000, 0xC000000 },
yading@10: };
yading@10: 
yading@10: static int set_bps_params(AVCodecContext *avctx)
yading@10: {
yading@10:     switch (avctx->bits_per_raw_sample) {
yading@10:     case 8:
yading@10:         avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
yading@10:         break;
yading@10:     case 16:
yading@10:         avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
yading@10:         break;
yading@10:     case 24:
yading@10:         avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
yading@10:         break;
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid/unsupported bits per sample: %d\n",
yading@10:                avctx->bits_per_raw_sample);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static void set_sample_rate_params(AVCodecContext *avctx)
yading@10: {
yading@10:     TAKDecContext *s  = avctx->priv_data;
yading@10:     int shift         = 3 - (avctx->sample_rate / 11025);
yading@10:     shift             = FFMAX(0, shift);
yading@10:     s->uval           = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << shift;
yading@10:     s->subframe_scale = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << 1;
yading@10: }
yading@10: 
yading@10: static av_cold int tak_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     TAKDecContext *s = avctx->priv_data;
yading@10: 
yading@10:     ff_tak_init_crc();
yading@10:     ff_dsputil_init(&s->dsp, avctx);
yading@10: 
yading@10:     s->avctx = avctx;
yading@10:     avctx->bits_per_raw_sample = avctx->bits_per_coded_sample;
yading@10: 
yading@10:     set_sample_rate_params(avctx);
yading@10: 
yading@10:     return set_bps_params(avctx);
yading@10: }
yading@10: 
yading@10: static void decode_lpc(int32_t *coeffs, int mode, int length)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     if (length < 2)
yading@10:         return;
yading@10: 
yading@10:     if (mode == 1) {
yading@10:         int a1 = *coeffs++;
yading@10:         for (i = 0; i < length - 1 >> 1; i++) {
yading@10:             *coeffs   += a1;
yading@10:             coeffs[1] += *coeffs;
yading@10:             a1         = coeffs[1];
yading@10:             coeffs    += 2;
yading@10:         }
yading@10:         if (length - 1 & 1)
yading@10:             *coeffs += a1;
yading@10:     } else if (mode == 2) {
yading@10:         int a1    = coeffs[1];
yading@10:         int a2    = a1 + *coeffs;
yading@10:         coeffs[1] = a2;
yading@10:         if (length > 2) {
yading@10:             coeffs += 2;
yading@10:             for (i = 0; i < length - 2 >> 1; i++) {
yading@10:                 int a3    = *coeffs + a1;
yading@10:                 int a4    = a3 + a2;
yading@10:                 *coeffs   = a4;
yading@10:                 a1        = coeffs[1] + a3;
yading@10:                 a2        = a1 + a4;
yading@10:                 coeffs[1] = a2;
yading@10:                 coeffs   += 2;
yading@10:             }
yading@10:             if (length & 1)
yading@10:                 *coeffs += a1 + a2;
yading@10:         }
yading@10:     } else if (mode == 3) {
yading@10:         int a1    = coeffs[1];
yading@10:         int a2    = a1 + *coeffs;
yading@10:         coeffs[1] = a2;
yading@10:         if (length > 2) {
yading@10:             int a3  = coeffs[2];
yading@10:             int a4  = a3 + a1;
yading@10:             int a5  = a4 + a2;
yading@10:             coeffs += 3;
yading@10:             for (i = 0; i < length - 3; i++) {
yading@10:                 a3     += *coeffs;
yading@10:                 a4     += a3;
yading@10:                 a5     += a4;
yading@10:                 *coeffs = a5;
yading@10:                 coeffs++;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int decode_segment(TAKDecContext *s, int8_t mode, int32_t *decoded, int len)
yading@10: {
yading@10:     struct CParam code;
yading@10:     GetBitContext *gb = &s->gb;
yading@10:     int i;
yading@10: 
yading@10:     if (!mode) {
yading@10:         memset(decoded, 0, len * sizeof(*decoded));
yading@10:         return 0;
yading@10:     }
yading@10: 
yading@10:     if (mode > FF_ARRAY_ELEMS(xcodes))
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     code = xcodes[mode - 1];
yading@10: 
yading@10:     for (i = 0; i < len; i++) {
yading@10:         int x = get_bits_long(gb, code.init);
yading@10:         if (x >= code.escape && get_bits1(gb)) {
yading@10:             x |= 1 << code.init;
yading@10:             if (x >= code.aescape) {
yading@10:                 int scale = get_unary(gb, 1, 9);
yading@10:                 if (scale == 9) {
yading@10:                     int scale_bits = get_bits(gb, 3);
yading@10:                     if (scale_bits > 0) {
yading@10:                         if (scale_bits == 7) {
yading@10:                             scale_bits += get_bits(gb, 5);
yading@10:                             if (scale_bits > 29)
yading@10:                                 return AVERROR_INVALIDDATA;
yading@10:                         }
yading@10:                         scale = get_bits_long(gb, scale_bits) + 1;
yading@10:                         x    += code.scale * scale;
yading@10:                     }
yading@10:                     x += code.bias;
yading@10:                 } else
yading@10:                     x += code.scale * scale - code.escape;
yading@10:             } else
yading@10:                 x -= code.escape;
yading@10:         }
yading@10:         decoded[i] = (x >> 1) ^ -(x & 1);
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_residues(TAKDecContext *s, int32_t *decoded, int length)
yading@10: {
yading@10:     GetBitContext *gb = &s->gb;
yading@10:     int i, mode, ret;
yading@10: 
yading@10:     if (length > s->nb_samples)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     if (get_bits1(gb)) {
yading@10:         int wlength, rval;
yading@10: 
yading@10:         wlength = length / s->uval;
yading@10: 
yading@10:         rval = length - (wlength * s->uval);
yading@10: 
yading@10:         if (rval < s->uval / 2)
yading@10:             rval += s->uval;
yading@10:         else
yading@10:             wlength++;
yading@10: 
yading@10:         if (wlength <= 1 || wlength > 128)
yading@10:             return AVERROR_INVALIDDATA;
yading@10: 
yading@10:         s->coding_mode[0] = mode = get_bits(gb, 6);
yading@10: 
yading@10:         for (i = 1; i < wlength; i++) {
yading@10:             int c = get_unary(gb, 1, 6);
yading@10: 
yading@10:             switch (c) {
yading@10:             case 6:
yading@10:                 mode = get_bits(gb, 6);
yading@10:                 break;
yading@10:             case 5:
yading@10:             case 4:
yading@10:             case 3: {
yading@10:                 /* mode += sign ? (1 - c) : (c - 1) */
yading@10:                 int sign = get_bits1(gb);
yading@10:                 mode    += (-sign ^ (c - 1)) + sign;
yading@10:                 break;
yading@10:             }
yading@10:             case 2:
yading@10:                 mode++;
yading@10:                 break;
yading@10:             case 1:
yading@10:                 mode--;
yading@10:                 break;
yading@10:             }
yading@10:             s->coding_mode[i] = mode;
yading@10:         }
yading@10: 
yading@10:         i = 0;
yading@10:         while (i < wlength) {
yading@10:             int len = 0;
yading@10: 
yading@10:             mode = s->coding_mode[i];
yading@10:             do {
yading@10:                 if (i >= wlength - 1)
yading@10:                     len += rval;
yading@10:                 else
yading@10:                     len += s->uval;
yading@10:                 i++;
yading@10: 
yading@10:                 if (i == wlength)
yading@10:                     break;
yading@10:             } while (s->coding_mode[i] == mode);
yading@10: 
yading@10:             if ((ret = decode_segment(s, mode, decoded, len)) < 0)
yading@10:                 return ret;
yading@10:             decoded += len;
yading@10:         }
yading@10:     } else {
yading@10:         mode = get_bits(gb, 6);
yading@10:         if ((ret = decode_segment(s, mode, decoded, length)) < 0)
yading@10:             return ret;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int get_bits_esc4(GetBitContext *gb)
yading@10: {
yading@10:     if (get_bits1(gb))
yading@10:         return get_bits(gb, 4) + 1;
yading@10:     else
yading@10:         return 0;
yading@10: }
yading@10: 
yading@10: static int decode_subframe(TAKDecContext *s, int32_t *decoded,
yading@10:                            int subframe_size, int prev_subframe_size)
yading@10: {
yading@10:     GetBitContext *gb = &s->gb;
yading@10:     int tmp, x, y, i, j, ret = 0;
yading@10:     int dshift, size, filter_quant, filter_order;
yading@10:     int tfilter[MAX_PREDICTORS];
yading@10: 
yading@10:     if (!get_bits1(gb))
yading@10:         return decode_residues(s, decoded, subframe_size);
yading@10: 
yading@10:     filter_order = predictor_sizes[get_bits(gb, 4)];
yading@10: 
yading@10:     if (prev_subframe_size > 0 && get_bits1(gb)) {
yading@10:         if (filter_order > prev_subframe_size)
yading@10:             return AVERROR_INVALIDDATA;
yading@10: 
yading@10:         decoded       -= filter_order;
yading@10:         subframe_size += filter_order;
yading@10: 
yading@10:         if (filter_order > subframe_size)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:     } else {
yading@10:         int lpc_mode;
yading@10: 
yading@10:         if (filter_order > subframe_size)
yading@10:             return AVERROR_INVALIDDATA;
yading@10: 
yading@10:         lpc_mode = get_bits(gb, 2);
yading@10:         if (lpc_mode > 2)
yading@10:             return AVERROR_INVALIDDATA;
yading@10: 
yading@10:         if ((ret = decode_residues(s, decoded, filter_order)) < 0)
yading@10:             return ret;
yading@10: 
yading@10:         if (lpc_mode)
yading@10:             decode_lpc(decoded, lpc_mode, filter_order);
yading@10:     }
yading@10: 
yading@10:     dshift = get_bits_esc4(gb);
yading@10:     size   = get_bits1(gb) + 6;
yading@10: 
yading@10:     filter_quant = 10;
yading@10:     if (get_bits1(gb)) {
yading@10:         filter_quant -= get_bits(gb, 3) + 1;
yading@10:         if (filter_quant < 3)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     s->predictors[0] = get_sbits(gb, 10);
yading@10:     s->predictors[1] = get_sbits(gb, 10);
yading@10:     s->predictors[2] = get_sbits(gb, size) << (10 - size);
yading@10:     s->predictors[3] = get_sbits(gb, size) << (10 - size);
yading@10:     if (filter_order > 4) {
yading@10:         tmp = size - get_bits1(gb);
yading@10: 
yading@10:         for (i = 4; i < filter_order; i++) {
yading@10:             if (!(i & 3))
yading@10:                 x = tmp - get_bits(gb, 2);
yading@10:             s->predictors[i] = get_sbits(gb, x) << (10 - size);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     tfilter[0] = s->predictors[0] << 6;
yading@10:     for (i = 1; i < filter_order; i++) {
yading@10:         int32_t *p1 = &tfilter[0];
yading@10:         int32_t *p2 = &tfilter[i - 1];
yading@10: 
yading@10:         for (j = 0; j < (i + 1) / 2; j++) {
yading@10:             x     = *p1 + (s->predictors[i] * *p2 + 256 >> 9);
yading@10:             *p2  += s->predictors[i] * *p1 + 256 >> 9;
yading@10:             *p1++ = x;
yading@10:             p2--;
yading@10:         }
yading@10: 
yading@10:         tfilter[i] = s->predictors[i] << 6;
yading@10:     }
yading@10: 
yading@10:     x = 1 << (32 - (15 - filter_quant));
yading@10:     y = 1 << ((15 - filter_quant) - 1);
yading@10:     for (i = 0, j = filter_order - 1; i < filter_order / 2; i++, j--) {
yading@10:         tmp = y + tfilter[j];
yading@10:         s->filter[j] = x - ((tfilter[i] + y) >> (15 - filter_quant));
yading@10:         s->filter[i] = x - ((tfilter[j] + y) >> (15 - filter_quant));
yading@10:     }
yading@10: 
yading@10:     if ((ret = decode_residues(s, &decoded[filter_order],
yading@10:                                subframe_size - filter_order)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     for (i = 0; i < filter_order; i++)
yading@10:         s->residues[i] = *decoded++ >> dshift;
yading@10: 
yading@10:     y    = FF_ARRAY_ELEMS(s->residues) - filter_order;
yading@10:     x    = subframe_size - filter_order;
yading@10:     while (x > 0) {
yading@10:         tmp = FFMIN(y, x);
yading@10: 
yading@10:         for (i = 0; i < tmp; i++) {
yading@10:             int v = 1 << (filter_quant - 1);
yading@10: 
yading@10:             if (!(filter_order & 15)) {
yading@10:                 v += s->dsp.scalarproduct_int16(&s->residues[i], s->filter,
yading@10:                                                 filter_order);
yading@10:             } else if (filter_order & 4) {
yading@10:                 for (j = 0; j < filter_order; j += 4) {
yading@10:                     v += s->residues[i + j + 3] * s->filter[j + 3] +
yading@10:                          s->residues[i + j + 2] * s->filter[j + 2] +
yading@10:                          s->residues[i + j + 1] * s->filter[j + 1] +
yading@10:                          s->residues[i + j    ] * s->filter[j    ];
yading@10:                 }
yading@10:             } else {
yading@10:                 for (j = 0; j < filter_order; j += 8) {
yading@10:                     v += s->residues[i + j + 7] * s->filter[j + 7] +
yading@10:                          s->residues[i + j + 6] * s->filter[j + 6] +
yading@10:                          s->residues[i + j + 5] * s->filter[j + 5] +
yading@10:                          s->residues[i + j + 4] * s->filter[j + 4] +
yading@10:                          s->residues[i + j + 3] * s->filter[j + 3] +
yading@10:                          s->residues[i + j + 2] * s->filter[j + 2] +
yading@10:                          s->residues[i + j + 1] * s->filter[j + 1] +
yading@10:                          s->residues[i + j    ] * s->filter[j    ];
yading@10:                 }
yading@10:             }
yading@10:             v = (av_clip(v >> filter_quant, -8192, 8191) << dshift) - *decoded;
yading@10:             *decoded++ = v;
yading@10:             s->residues[filter_order + i] = v >> dshift;
yading@10:         }
yading@10: 
yading@10:         x -= tmp;
yading@10:         if (x > 0)
yading@10:             memcpy(s->residues, &s->residues[y], 2 * filter_order);
yading@10:     }
yading@10: 
yading@10:     emms_c();
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_channel(TAKDecContext *s, int chan)
yading@10: {
yading@10:     AVCodecContext *avctx = s->avctx;
yading@10:     GetBitContext *gb     = &s->gb;
yading@10:     int32_t *decoded      = s->decoded[chan];
yading@10:     int left              = s->nb_samples - 1;
yading@10:     int i = 0, ret, prev = 0;
yading@10: 
yading@10:     s->sample_shift[chan] = get_bits_esc4(gb);
yading@10:     if (s->sample_shift[chan] >= avctx->bits_per_raw_sample)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     *decoded++ = get_sbits(gb, avctx->bits_per_raw_sample - s->sample_shift[chan]);
yading@10:     s->lpc_mode[chan] = get_bits(gb, 2);
yading@10:     s->nb_subframes   = get_bits(gb, 3) + 1;
yading@10: 
yading@10:     if (s->nb_subframes > 1) {
yading@10:         if (get_bits_left(gb) < (s->nb_subframes - 1) * 6)
yading@10:             return AVERROR_INVALIDDATA;
yading@10: 
yading@10:         for (; i < s->nb_subframes - 1; i++) {
yading@10:             int v = get_bits(gb, 6);
yading@10: 
yading@10:             s->subframe_len[i] = (v - prev) * s->subframe_scale;
yading@10:             if (s->subframe_len[i] <= 0)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10: 
yading@10:             left -= s->subframe_len[i];
yading@10:             prev  = v;
yading@10:         }
yading@10: 
yading@10:         if (left <= 0)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     s->subframe_len[i] = left;
yading@10: 
yading@10:     prev = 0;
yading@10:     for (i = 0; i < s->nb_subframes; i++) {
yading@10:         if ((ret = decode_subframe(s, decoded, s->subframe_len[i], prev)) < 0)
yading@10:             return ret;
yading@10:         decoded += s->subframe_len[i];
yading@10:         prev     = s->subframe_len[i];
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
yading@10: {
yading@10:     GetBitContext *gb = &s->gb;
yading@10:     int32_t *p1       = s->decoded[c1] + 1;
yading@10:     int32_t *p2       = s->decoded[c2] + 1;
yading@10:     int i;
yading@10:     int dshift, dfactor;
yading@10: 
yading@10:     switch (s->dmode) {
yading@10:     case 1: /* left/side */
yading@10:         for (i = 0; i < length; i++) {
yading@10:             int32_t a = p1[i];
yading@10:             int32_t b = p2[i];
yading@10:             p2[i]     = a + b;
yading@10:         }
yading@10:         break;
yading@10:     case 2: /* side/right */
yading@10:         for (i = 0; i < length; i++) {
yading@10:             int32_t a = p1[i];
yading@10:             int32_t b = p2[i];
yading@10:             p1[i]     = b - a;
yading@10:         }
yading@10:         break;
yading@10:     case 3: /* side/mid */
yading@10:         for (i = 0; i < length; i++) {
yading@10:             int32_t a = p1[i];
yading@10:             int32_t b = p2[i];
yading@10:             a        -= b >> 1;
yading@10:             p1[i]     = a;
yading@10:             p2[i]     = a + b;
yading@10:         }
yading@10:         break;
yading@10:     case 4: /* side/left with scale factor */
yading@10:         FFSWAP(int32_t*, p1, p2);
yading@10:     case 5: /* side/right with scale factor */
yading@10:         dshift  = get_bits_esc4(gb);
yading@10:         dfactor = get_sbits(gb, 10);
yading@10:         for (i = 0; i < length; i++) {
yading@10:             int32_t a = p1[i];
yading@10:             int32_t b = p2[i];
yading@10:             b         = dfactor * (b >> dshift) + 128 >> 8 << dshift;
yading@10:             p1[i]     = b - a;
yading@10:         }
yading@10:         break;
yading@10:     case 6:
yading@10:         FFSWAP(int32_t*, p1, p2);
yading@10:     case 7: {
yading@10:         int length2, order_half, filter_order, dval1, dval2;
yading@10:         int tmp, x, code_size;
yading@10: 
yading@10:         if (length < 256)
yading@10:             return AVERROR_INVALIDDATA;
yading@10: 
yading@10:         dshift       = get_bits_esc4(gb);
yading@10:         filter_order = 8 << get_bits1(gb);
yading@10:         dval1        = get_bits1(gb);
yading@10:         dval2        = get_bits1(gb);
yading@10: 
yading@10:         for (i = 0; i < filter_order; i++) {
yading@10:             if (!(i & 3))
yading@10:                 code_size = 14 - get_bits(gb, 3);
yading@10:             s->filter[i] = get_sbits(gb, code_size);
yading@10:         }
yading@10: 
yading@10:         order_half = filter_order / 2;
yading@10:         length2    = length - (filter_order - 1);
yading@10: 
yading@10:         /* decorrelate beginning samples */
yading@10:         if (dval1) {
yading@10:             for (i = 0; i < order_half; i++) {
yading@10:                 int32_t a = p1[i];
yading@10:                 int32_t b = p2[i];
yading@10:                 p1[i]     = a + b;
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         /* decorrelate ending samples */
yading@10:         if (dval2) {
yading@10:             for (i = length2 + order_half; i < length; i++) {
yading@10:                 int32_t a = p1[i];
yading@10:                 int32_t b = p2[i];
yading@10:                 p1[i]     = a + b;
yading@10:             }
yading@10:         }
yading@10: 
yading@10: 
yading@10:         for (i = 0; i < filter_order; i++)
yading@10:             s->residues[i] = *p2++ >> dshift;
yading@10: 
yading@10:         p1 += order_half;
yading@10:         x = FF_ARRAY_ELEMS(s->residues) - filter_order;
yading@10:         for (; length2 > 0; length2 -= tmp) {
yading@10:             tmp = FFMIN(length2, x);
yading@10: 
yading@10:             for (i = 0; i < tmp; i++)
yading@10:                 s->residues[filter_order + i] = *p2++ >> dshift;
yading@10: 
yading@10:             for (i = 0; i < tmp; i++) {
yading@10:                 int v = 1 << 9;
yading@10: 
yading@10:                 if (filter_order == 16) {
yading@10:                     v += s->dsp.scalarproduct_int16(&s->residues[i], s->filter,
yading@10:                                                     filter_order);
yading@10:                 } else {
yading@10:                     v += s->residues[i + 7] * s->filter[7] +
yading@10:                          s->residues[i + 6] * s->filter[6] +
yading@10:                          s->residues[i + 5] * s->filter[5] +
yading@10:                          s->residues[i + 4] * s->filter[4] +
yading@10:                          s->residues[i + 3] * s->filter[3] +
yading@10:                          s->residues[i + 2] * s->filter[2] +
yading@10:                          s->residues[i + 1] * s->filter[1] +
yading@10:                          s->residues[i    ] * s->filter[0];
yading@10:                 }
yading@10: 
yading@10:                 v = (av_clip(v >> 10, -8192, 8191) << dshift) - *p1;
yading@10:                 *p1++ = v;
yading@10:             }
yading@10: 
yading@10:             memcpy(s->residues, &s->residues[tmp], 2 * filter_order);
yading@10:         }
yading@10: 
yading@10:         emms_c();
yading@10:         break;
yading@10:     }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int tak_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                             int *got_frame_ptr, AVPacket *pkt)
yading@10: {
yading@10:     TAKDecContext *s  = avctx->priv_data;
yading@10:     AVFrame *frame    = data;
yading@10:     GetBitContext *gb = &s->gb;
yading@10:     int chan, i, ret, hsize;
yading@10: 
yading@10:     if (pkt->size < TAK_MIN_FRAME_HEADER_BYTES)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     if ((ret = init_get_bits8(gb, pkt->data, pkt->size)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (avctx->err_recognition & AV_EF_CRCCHECK) {
yading@10:         hsize = get_bits_count(gb) / 8;
yading@10:         if (ff_tak_check_crc(pkt->data, hsize)) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "CRC error\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (s->ti.codec != TAK_CODEC_MONO_STEREO &&
yading@10:         s->ti.codec != TAK_CODEC_MULTICHANNEL) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "unsupported codec: %d\n", s->ti.codec);
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10:     if (s->ti.data_type) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "unsupported data type: %d\n", s->ti.data_type);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if (s->ti.codec == TAK_CODEC_MONO_STEREO && s->ti.channels > 2) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "invalid number of channels: %d\n", s->ti.channels);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if (s->ti.channels > 6) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "unsupported number of channels: %d\n", s->ti.channels);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (s->ti.frame_samples <= 0) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of samples\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (s->ti.bps != avctx->bits_per_raw_sample) {
yading@10:         avctx->bits_per_raw_sample = s->ti.bps;
yading@10:         if ((ret = set_bps_params(avctx)) < 0)
yading@10:             return ret;
yading@10:     }
yading@10:     if (s->ti.sample_rate != avctx->sample_rate) {
yading@10:         avctx->sample_rate = s->ti.sample_rate;
yading@10:         set_sample_rate_params(avctx);
yading@10:     }
yading@10:     if (s->ti.ch_layout)
yading@10:         avctx->channel_layout = s->ti.ch_layout;
yading@10:     avctx->channels = s->ti.channels;
yading@10: 
yading@10:     s->nb_samples = s->ti.last_frame_samples ? s->ti.last_frame_samples
yading@10:                                              : s->ti.frame_samples;
yading@10: 
yading@10:     frame->nb_samples = s->nb_samples;
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (avctx->bits_per_raw_sample <= 16) {
yading@10:         int buf_size = av_samples_get_buffer_size(NULL, avctx->channels,
yading@10:                                                   s->nb_samples,
yading@10:                                                   AV_SAMPLE_FMT_S32P, 0);
yading@10:         av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size, buf_size);
yading@10:         if (!s->decode_buffer)
yading@10:             return AVERROR(ENOMEM);
yading@10:         ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL,
yading@10:                                      s->decode_buffer, avctx->channels,
yading@10:                                      s->nb_samples, AV_SAMPLE_FMT_S32P, 0);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10:     } else {
yading@10:         for (chan = 0; chan < avctx->channels; chan++)
yading@10:             s->decoded[chan] = (int32_t *)frame->extended_data[chan];
yading@10:     }
yading@10: 
yading@10:     if (s->nb_samples < 16) {
yading@10:         for (chan = 0; chan < avctx->channels; chan++) {
yading@10:             int32_t *decoded = s->decoded[chan];
yading@10:             for (i = 0; i < s->nb_samples; i++)
yading@10:                 decoded[i] = get_sbits(gb, avctx->bits_per_raw_sample);
yading@10:         }
yading@10:     } else {
yading@10:         if (s->ti.codec == TAK_CODEC_MONO_STEREO) {
yading@10:             for (chan = 0; chan < avctx->channels; chan++)
yading@10:                 if (ret = decode_channel(s, chan))
yading@10:                     return ret;
yading@10: 
yading@10:             if (avctx->channels == 2) {
yading@10:                 s->nb_subframes = get_bits(gb, 1) + 1;
yading@10:                 if (s->nb_subframes > 1) {
yading@10:                     s->subframe_len[1] = get_bits(gb, 6);
yading@10:                 }
yading@10: 
yading@10:                 s->dmode = get_bits(gb, 3);
yading@10:                 if (ret = decorrelate(s, 0, 1, s->nb_samples - 1))
yading@10:                     return ret;
yading@10:             }
yading@10:         } else if (s->ti.codec == TAK_CODEC_MULTICHANNEL) {
yading@10:             if (get_bits1(gb)) {
yading@10:                 int ch_mask = 0;
yading@10: 
yading@10:                 chan = get_bits(gb, 4) + 1;
yading@10:                 if (chan > avctx->channels)
yading@10:                     return AVERROR_INVALIDDATA;
yading@10: 
yading@10:                 for (i = 0; i < chan; i++) {
yading@10:                     int nbit = get_bits(gb, 4);
yading@10: 
yading@10:                     if (nbit >= avctx->channels)
yading@10:                         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:                     if (ch_mask & 1 << nbit)
yading@10:                         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:                     s->mcdparams[i].present = get_bits1(gb);
yading@10:                     if (s->mcdparams[i].present) {
yading@10:                         s->mcdparams[i].index = get_bits(gb, 2);
yading@10:                         s->mcdparams[i].chan2 = get_bits(gb, 4);
yading@10:                         if (s->mcdparams[i].index == 1) {
yading@10:                             if ((nbit == s->mcdparams[i].chan2) ||
yading@10:                                 (ch_mask & 1 << s->mcdparams[i].chan2))
yading@10:                                 return AVERROR_INVALIDDATA;
yading@10: 
yading@10:                             ch_mask |= 1 << s->mcdparams[i].chan2;
yading@10:                         } else if (!(ch_mask & 1 << s->mcdparams[i].chan2)) {
yading@10:                             return AVERROR_INVALIDDATA;
yading@10:                         }
yading@10:                     }
yading@10:                     s->mcdparams[i].chan1 = nbit;
yading@10: 
yading@10:                     ch_mask |= 1 << nbit;
yading@10:                 }
yading@10:             } else {
yading@10:                 chan = avctx->channels;
yading@10:                 for (i = 0; i < chan; i++) {
yading@10:                     s->mcdparams[i].present = 0;
yading@10:                     s->mcdparams[i].chan1   = i;
yading@10:                 }
yading@10:             }
yading@10: 
yading@10:             for (i = 0; i < chan; i++) {
yading@10:                 if (s->mcdparams[i].present && s->mcdparams[i].index == 1)
yading@10:                     if (ret = decode_channel(s, s->mcdparams[i].chan2))
yading@10:                         return ret;
yading@10: 
yading@10:                 if (ret = decode_channel(s, s->mcdparams[i].chan1))
yading@10:                     return ret;
yading@10: 
yading@10:                 if (s->mcdparams[i].present) {
yading@10:                     s->dmode = mc_dmodes[s->mcdparams[i].index];
yading@10:                     if (ret = decorrelate(s,
yading@10:                                           s->mcdparams[i].chan2,
yading@10:                                           s->mcdparams[i].chan1,
yading@10:                                           s->nb_samples - 1))
yading@10:                         return ret;
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         for (chan = 0; chan < avctx->channels; chan++) {
yading@10:             int32_t *decoded = s->decoded[chan];
yading@10: 
yading@10:             if (s->lpc_mode[chan])
yading@10:                 decode_lpc(decoded, s->lpc_mode[chan], s->nb_samples);
yading@10: 
yading@10:             if (s->sample_shift[chan] > 0)
yading@10:                 for (i = 0; i < s->nb_samples; i++)
yading@10:                     decoded[i] <<= s->sample_shift[chan];
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     align_get_bits(gb);
yading@10:     skip_bits(gb, 24);
yading@10:     if (get_bits_left(gb) < 0)
yading@10:         av_log(avctx, AV_LOG_DEBUG, "overread\n");
yading@10:     else if (get_bits_left(gb) > 0)
yading@10:         av_log(avctx, AV_LOG_DEBUG, "underread\n");
yading@10: 
yading@10:     if (avctx->err_recognition & AV_EF_CRCCHECK) {
yading@10:         if (ff_tak_check_crc(pkt->data + hsize,
yading@10:                              get_bits_count(gb) / 8 - hsize)) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "CRC error\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     /* convert to output buffer */
yading@10:     switch (avctx->sample_fmt) {
yading@10:     case AV_SAMPLE_FMT_U8P:
yading@10:         for (chan = 0; chan < avctx->channels; chan++) {
yading@10:             uint8_t *samples = (uint8_t *)frame->extended_data[chan];
yading@10:             int32_t *decoded = s->decoded[chan];
yading@10:             for (i = 0; i < s->nb_samples; i++)
yading@10:                 samples[i] = decoded[i] + 0x80;
yading@10:         }
yading@10:         break;
yading@10:     case AV_SAMPLE_FMT_S16P:
yading@10:         for (chan = 0; chan < avctx->channels; chan++) {
yading@10:             int16_t *samples = (int16_t *)frame->extended_data[chan];
yading@10:             int32_t *decoded = s->decoded[chan];
yading@10:             for (i = 0; i < s->nb_samples; i++)
yading@10:                 samples[i] = decoded[i];
yading@10:         }
yading@10:         break;
yading@10:     case AV_SAMPLE_FMT_S32P:
yading@10:         for (chan = 0; chan < avctx->channels; chan++) {
yading@10:             int32_t *samples = (int32_t *)frame->extended_data[chan];
yading@10:             for (i = 0; i < s->nb_samples; i++)
yading@10:                 samples[i] <<= 8;
yading@10:         }
yading@10:         break;
yading@10:     }
yading@10: 
yading@10:     *got_frame_ptr = 1;
yading@10: 
yading@10:     return pkt->size;
yading@10: }
yading@10: 
yading@10: static av_cold int tak_decode_close(AVCodecContext *avctx)
yading@10: {
yading@10:     TAKDecContext *s = avctx->priv_data;
yading@10: 
yading@10:     av_freep(&s->decode_buffer);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_tak_decoder = {
yading@10:     .name             = "tak",
yading@10:     .type             = AVMEDIA_TYPE_AUDIO,
yading@10:     .id               = AV_CODEC_ID_TAK,
yading@10:     .priv_data_size   = sizeof(TAKDecContext),
yading@10:     .init             = tak_decode_init,
yading@10:     .close            = tak_decode_close,
yading@10:     .decode           = tak_decode_frame,
yading@10:     .capabilities     = CODEC_CAP_DR1,
yading@10:     .long_name        = NULL_IF_CONFIG_SMALL("TAK (Tom's lossless Audio Kompressor)"),
yading@10:     .sample_fmts      = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
yading@10:                                                         AV_SAMPLE_FMT_S16P,
yading@10:                                                         AV_SAMPLE_FMT_S32P,
yading@10:                                                         AV_SAMPLE_FMT_NONE },
yading@10: };