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FFmpeg/libavcodec/takdec.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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/*
* TAK decoder
* Copyright (c) 2012 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* TAK (Tom's lossless Audio Kompressor) decoder
* @author Paul B Mahol
*/
#include "libavutil/internal.h"
#include "libavutil/mem_internal.h"
#include "libavutil/samplefmt.h"
#define BITSTREAM_READER_LE
#include "audiodsp.h"
#include "thread.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "unary.h"
#include "tak.h"
#include "takdsp.h"
#define MAX_SUBFRAMES 8 ///< max number of subframes per channel
#define MAX_PREDICTORS 256
typedef struct MCDParam {
int8_t present; ///< decorrelation parameter availability for this channel
int8_t index; ///< index into array of decorrelation types
int8_t chan1;
int8_t chan2;
} MCDParam;
typedef struct TAKDecContext {
AVCodecContext *avctx; ///< parent AVCodecContext
AudioDSPContext adsp;
TAKDSPContext tdsp;
TAKStreamInfo ti;
GetBitContext gb; ///< bitstream reader initialized to start at the current frame
int uval;
int nb_samples; ///< number of samples in the current frame
uint8_t *decode_buffer;
unsigned int decode_buffer_size;
int32_t *decoded[TAK_MAX_CHANNELS]; ///< decoded samples for each channel
int8_t lpc_mode[TAK_MAX_CHANNELS];
int8_t sample_shift[TAK_MAX_CHANNELS]; ///< shift applied to every sample in the channel
int16_t predictors[MAX_PREDICTORS];
int nb_subframes; ///< number of subframes in the current frame
int16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples
int subframe_scale;
int8_t dmode; ///< channel decorrelation type in the current frame
MCDParam mcdparams[TAK_MAX_CHANNELS]; ///< multichannel decorrelation parameters
int8_t coding_mode[128];
DECLARE_ALIGNED(16, int16_t, filter)[MAX_PREDICTORS];
DECLARE_ALIGNED(16, int16_t, residues)[544];
} TAKDecContext;
static const int8_t mc_dmodes[] = { 1, 3, 4, 6, };
static const uint16_t predictor_sizes[] = {
4, 8, 12, 16, 24, 32, 48, 64, 80, 96, 128, 160, 192, 224, 256, 0,
};
static const struct CParam {
int init;
int escape;
int scale;
int aescape;
int bias;
} xcodes[50] = {
{ 0x01, 0x0000001, 0x0000001, 0x0000003, 0x0000008 },
{ 0x02, 0x0000003, 0x0000001, 0x0000007, 0x0000006 },
{ 0x03, 0x0000005, 0x0000002, 0x000000E, 0x000000D },
{ 0x03, 0x0000003, 0x0000003, 0x000000D, 0x0000018 },
{ 0x04, 0x000000B, 0x0000004, 0x000001C, 0x0000019 },
{ 0x04, 0x0000006, 0x0000006, 0x000001A, 0x0000030 },
{ 0x05, 0x0000016, 0x0000008, 0x0000038, 0x0000032 },
{ 0x05, 0x000000C, 0x000000C, 0x0000034, 0x0000060 },
{ 0x06, 0x000002C, 0x0000010, 0x0000070, 0x0000064 },
{ 0x06, 0x0000018, 0x0000018, 0x0000068, 0x00000C0 },
{ 0x07, 0x0000058, 0x0000020, 0x00000E0, 0x00000C8 },
{ 0x07, 0x0000030, 0x0000030, 0x00000D0, 0x0000180 },
{ 0x08, 0x00000B0, 0x0000040, 0x00001C0, 0x0000190 },
{ 0x08, 0x0000060, 0x0000060, 0x00001A0, 0x0000300 },
{ 0x09, 0x0000160, 0x0000080, 0x0000380, 0x0000320 },
{ 0x09, 0x00000C0, 0x00000C0, 0x0000340, 0x0000600 },
{ 0x0A, 0x00002C0, 0x0000100, 0x0000700, 0x0000640 },
{ 0x0A, 0x0000180, 0x0000180, 0x0000680, 0x0000C00 },
{ 0x0B, 0x0000580, 0x0000200, 0x0000E00, 0x0000C80 },
{ 0x0B, 0x0000300, 0x0000300, 0x0000D00, 0x0001800 },
{ 0x0C, 0x0000B00, 0x0000400, 0x0001C00, 0x0001900 },
{ 0x0C, 0x0000600, 0x0000600, 0x0001A00, 0x0003000 },
{ 0x0D, 0x0001600, 0x0000800, 0x0003800, 0x0003200 },
{ 0x0D, 0x0000C00, 0x0000C00, 0x0003400, 0x0006000 },
{ 0x0E, 0x0002C00, 0x0001000, 0x0007000, 0x0006400 },
{ 0x0E, 0x0001800, 0x0001800, 0x0006800, 0x000C000 },
{ 0x0F, 0x0005800, 0x0002000, 0x000E000, 0x000C800 },
{ 0x0F, 0x0003000, 0x0003000, 0x000D000, 0x0018000 },
{ 0x10, 0x000B000, 0x0004000, 0x001C000, 0x0019000 },
{ 0x10, 0x0006000, 0x0006000, 0x001A000, 0x0030000 },
{ 0x11, 0x0016000, 0x0008000, 0x0038000, 0x0032000 },
{ 0x11, 0x000C000, 0x000C000, 0x0034000, 0x0060000 },
{ 0x12, 0x002C000, 0x0010000, 0x0070000, 0x0064000 },
{ 0x12, 0x0018000, 0x0018000, 0x0068000, 0x00C0000 },
{ 0x13, 0x0058000, 0x0020000, 0x00E0000, 0x00C8000 },
{ 0x13, 0x0030000, 0x0030000, 0x00D0000, 0x0180000 },
{ 0x14, 0x00B0000, 0x0040000, 0x01C0000, 0x0190000 },
{ 0x14, 0x0060000, 0x0060000, 0x01A0000, 0x0300000 },
{ 0x15, 0x0160000, 0x0080000, 0x0380000, 0x0320000 },
{ 0x15, 0x00C0000, 0x00C0000, 0x0340000, 0x0600000 },
{ 0x16, 0x02C0000, 0x0100000, 0x0700000, 0x0640000 },
{ 0x16, 0x0180000, 0x0180000, 0x0680000, 0x0C00000 },
{ 0x17, 0x0580000, 0x0200000, 0x0E00000, 0x0C80000 },
{ 0x17, 0x0300000, 0x0300000, 0x0D00000, 0x1800000 },
{ 0x18, 0x0B00000, 0x0400000, 0x1C00000, 0x1900000 },
{ 0x18, 0x0600000, 0x0600000, 0x1A00000, 0x3000000 },
{ 0x19, 0x1600000, 0x0800000, 0x3800000, 0x3200000 },
{ 0x19, 0x0C00000, 0x0C00000, 0x3400000, 0x6000000 },
{ 0x1A, 0x2C00000, 0x1000000, 0x7000000, 0x6400000 },
{ 0x1A, 0x1800000, 0x1800000, 0x6800000, 0xC000000 },
};
static int set_bps_params(AVCodecContext *avctx)
{
switch (avctx->bits_per_raw_sample) {
case 8:
avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
break;
case 16:
avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
break;
case 24:
avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
break;
default:
av_log(avctx, AV_LOG_ERROR, "invalid/unsupported bits per sample: %d\n",
avctx->bits_per_raw_sample);
return AVERROR_INVALIDDATA;
}
return 0;
}
static void set_sample_rate_params(AVCodecContext *avctx)
{
TAKDecContext *s = avctx->priv_data;
int shift;
if (avctx->sample_rate < 11025) {
shift = 3;
} else if (avctx->sample_rate < 22050) {
shift = 2;
} else if (avctx->sample_rate < 44100) {
shift = 1;
} else {
shift = 0;
}
s->uval = FFALIGN(avctx->sample_rate + 511LL >> 9, 4) << shift;
s->subframe_scale = FFALIGN(avctx->sample_rate + 511LL >> 9, 4) << 1;
}
static av_cold int tak_decode_init(AVCodecContext *avctx)
{
TAKDecContext *s = avctx->priv_data;
ff_audiodsp_init(&s->adsp);
ff_takdsp_init(&s->tdsp);
s->avctx = avctx;
avctx->bits_per_raw_sample = avctx->bits_per_coded_sample;
set_sample_rate_params(avctx);
return set_bps_params(avctx);
}
static void decode_lpc(int32_t *coeffs, int mode, int length)
{
int i;
if (length < 2)
return;
if (mode == 1) {
unsigned a1 = *coeffs++;
for (i = 0; i < length - 1 >> 1; i++) {
*coeffs += a1;
coeffs[1] += (unsigned)*coeffs;
a1 = coeffs[1];
coeffs += 2;
}
if (length - 1 & 1)
*coeffs += a1;
} else if (mode == 2) {
unsigned a1 = coeffs[1];
unsigned a2 = a1 + *coeffs;
coeffs[1] = a2;
if (length > 2) {
coeffs += 2;
for (i = 0; i < length - 2 >> 1; i++) {
unsigned a3 = *coeffs + a1;
unsigned a4 = a3 + a2;
*coeffs = a4;
a1 = coeffs[1] + a3;
a2 = a1 + a4;
coeffs[1] = a2;
coeffs += 2;
}
if (length & 1)
*coeffs += a1 + a2;
}
} else if (mode == 3) {
unsigned a1 = coeffs[1];
unsigned a2 = a1 + *coeffs;
coeffs[1] = a2;
if (length > 2) {
unsigned a3 = coeffs[2];
unsigned a4 = a3 + a1;
unsigned a5 = a4 + a2;
coeffs[2] = a5;
coeffs += 3;
for (i = 0; i < length - 3; i++) {
a3 += *coeffs;
a4 += a3;
a5 += a4;
*coeffs = a5;
coeffs++;
}
}
}
}
static int decode_segment(TAKDecContext *s, int8_t mode, int32_t *decoded, int len)
{
struct CParam code;
GetBitContext *gb = &s->gb;
int i;
if (!mode) {
memset(decoded, 0, len * sizeof(*decoded));
return 0;
}
if (mode > FF_ARRAY_ELEMS(xcodes))
return AVERROR_INVALIDDATA;
code = xcodes[mode - 1];
for (i = 0; i < len; i++) {
unsigned x = get_bits_long(gb, code.init);
if (x >= code.escape && get_bits1(gb)) {
x |= 1 << code.init;
if (x >= code.aescape) {
unsigned scale = get_unary(gb, 1, 9);
if (scale == 9) {
int scale_bits = get_bits(gb, 3);
if (scale_bits > 0) {
if (scale_bits == 7) {
scale_bits += get_bits(gb, 5);
if (scale_bits > 29)
return AVERROR_INVALIDDATA;
}
scale = get_bits_long(gb, scale_bits) + 1;
x += code.scale * scale;
}
x += code.bias;
} else
x += code.scale * scale - code.escape;
} else
x -= code.escape;
}
decoded[i] = (x >> 1) ^ -(x & 1);
}
return 0;
}
static int decode_residues(TAKDecContext *s, int32_t *decoded, int length)
{
GetBitContext *gb = &s->gb;
int i, mode, ret;
if (length > s->nb_samples)
return AVERROR_INVALIDDATA;
if (get_bits1(gb)) {
int wlength, rval;
wlength = length / s->uval;
rval = length - (wlength * s->uval);
if (rval < s->uval / 2)
rval += s->uval;
else
wlength++;
if (wlength <= 1 || wlength > 128)
return AVERROR_INVALIDDATA;
s->coding_mode[0] = mode = get_bits(gb, 6);
for (i = 1; i < wlength; i++) {
int c = get_unary(gb, 1, 6);
switch (c) {
case 6:
mode = get_bits(gb, 6);
break;
case 5:
case 4:
case 3: {
/* mode += sign ? (1 - c) : (c - 1) */
int sign = get_bits1(gb);
mode += (-sign ^ (c - 1)) + sign;
break;
}
case 2:
mode++;
break;
case 1:
mode--;
break;
}
s->coding_mode[i] = mode;
}
i = 0;
while (i < wlength) {
int len = 0;
mode = s->coding_mode[i];
do {
if (i >= wlength - 1)
len += rval;
else
len += s->uval;
i++;
if (i == wlength)
break;
} while (s->coding_mode[i] == mode);
if ((ret = decode_segment(s, mode, decoded, len)) < 0)
return ret;
decoded += len;
}
} else {
mode = get_bits(gb, 6);
if ((ret = decode_segment(s, mode, decoded, length)) < 0)
return ret;
}
return 0;
}
static int get_bits_esc4(GetBitContext *gb)
{
if (get_bits1(gb))
return get_bits(gb, 4) + 1;
else
return 0;
}
static int decode_subframe(TAKDecContext *s, int32_t *decoded,
int subframe_size, int prev_subframe_size)
{
GetBitContext *gb = &s->gb;
int x, y, i, j, ret = 0;
int dshift, size, filter_quant, filter_order;
int tfilter[MAX_PREDICTORS];
if (!get_bits1(gb))
return decode_residues(s, decoded, subframe_size);
filter_order = predictor_sizes[get_bits(gb, 4)];
if (prev_subframe_size > 0 && get_bits1(gb)) {
if (filter_order > prev_subframe_size)
return AVERROR_INVALIDDATA;
decoded -= filter_order;
subframe_size += filter_order;
if (filter_order > subframe_size)
return AVERROR_INVALIDDATA;
} else {
int lpc_mode;
if (filter_order > subframe_size)
return AVERROR_INVALIDDATA;
lpc_mode = get_bits(gb, 2);
if (lpc_mode > 2)
return AVERROR_INVALIDDATA;
if ((ret = decode_residues(s, decoded, filter_order)) < 0)
return ret;
if (lpc_mode)
decode_lpc(decoded, lpc_mode, filter_order);
}
dshift = get_bits_esc4(gb);
size = get_bits1(gb) + 6;
filter_quant = 10;
if (get_bits1(gb)) {
filter_quant -= get_bits(gb, 3) + 1;
if (filter_quant < 3)
return AVERROR_INVALIDDATA;
}
s->predictors[0] = get_sbits(gb, 10);
s->predictors[1] = get_sbits(gb, 10);
s->predictors[2] = get_sbits(gb, size) * (1 << (10 - size));
s->predictors[3] = get_sbits(gb, size) * (1 << (10 - size));
if (filter_order > 4) {
int tmp = size - get_bits1(gb);
for (i = 4; i < filter_order; i++) {
if (!(i & 3))
x = tmp - get_bits(gb, 2);
s->predictors[i] = get_sbits(gb, x) * (1 << (10 - size));
}
}
tfilter[0] = s->predictors[0] * 64;
for (i = 1; i < filter_order; i++) {
uint32_t *p1 = &tfilter[0];
uint32_t *p2 = &tfilter[i - 1];
for (j = 0; j < (i + 1) / 2; j++) {
x = *p1 + ((int32_t)(s->predictors[i] * *p2 + 256) >> 9);
*p2 += (int32_t)(s->predictors[i] * *p1 + 256) >> 9;
*p1++ = x;
p2--;
}
tfilter[i] = s->predictors[i] * 64;
}
x = 1 << (32 - (15 - filter_quant));
y = 1 << ((15 - filter_quant) - 1);
for (i = 0, j = filter_order - 1; i < filter_order / 2; i++, j--) {
s->filter[j] = x - ((tfilter[i] + y) >> (15 - filter_quant));
s->filter[i] = x - ((tfilter[j] + y) >> (15 - filter_quant));
}
if ((ret = decode_residues(s, &decoded[filter_order],
subframe_size - filter_order)) < 0)
return ret;
for (i = 0; i < filter_order; i++)
s->residues[i] = *decoded++ >> dshift;
y = FF_ARRAY_ELEMS(s->residues) - filter_order;
x = subframe_size - filter_order;
while (x > 0) {
int tmp = FFMIN(y, x);
for (i = 0; i < tmp; i++) {
int v = 1 << (filter_quant - 1);
if (filter_order & -16)
v += (unsigned)s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
filter_order & -16);
for (j = filter_order & -16; j < filter_order; j += 4) {
v += s->residues[i + j + 3] * (unsigned)s->filter[j + 3] +
s->residues[i + j + 2] * (unsigned)s->filter[j + 2] +
s->residues[i + j + 1] * (unsigned)s->filter[j + 1] +
s->residues[i + j ] * (unsigned)s->filter[j ];
}
v = (av_clip_intp2(v >> filter_quant, 13) * (1 << dshift)) - (unsigned)*decoded;
*decoded++ = v;
s->residues[filter_order + i] = v >> dshift;
}
x -= tmp;
if (x > 0)
memcpy(s->residues, &s->residues[y], 2 * filter_order);
}
emms_c();
return 0;
}
static int decode_channel(TAKDecContext *s, int chan)
{
AVCodecContext *avctx = s->avctx;
GetBitContext *gb = &s->gb;
int32_t *decoded = s->decoded[chan];
int left = s->nb_samples - 1;
int i = 0, ret, prev = 0;
s->sample_shift[chan] = get_bits_esc4(gb);
if (s->sample_shift[chan] >= avctx->bits_per_raw_sample)
return AVERROR_INVALIDDATA;
*decoded++ = get_sbits(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, decoded, s->subframe_len[i], prev)) < 0)
return ret;
decoded += 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;
int32_t *p1 = s->decoded[c1] + (s->dmode > 5);
int32_t *p2 = s->decoded[c2] + (s->dmode > 5);
int32_t bp1 = p1[0];
int32_t bp2 = p2[0];
int i;
int dshift, dfactor;
length += s->dmode < 6;
switch (s->dmode) {
case 1: /* left/side */
s->tdsp.decorrelate_ls(p1, p2, length);
break;
case 2: /* side/right */
s->tdsp.decorrelate_sr(p1, p2, length);
break;
case 3: /* side/mid */
s->tdsp.decorrelate_sm(p1, p2, length);
break;
case 4: /* side/left with scale factor */
FFSWAP(int32_t*, p1, p2);
FFSWAP(int32_t, bp1, bp2);
case 5: /* side/right with scale factor */
dshift = get_bits_esc4(gb);
dfactor = get_sbits(gb, 10);
s->tdsp.decorrelate_sf(p1, p2, length, dshift, dfactor);
break;
case 6:
FFSWAP(int32_t*, p1, p2);
case 7: {
int length2, order_half, filter_order, dval1, dval2;
int tmp, x, code_size;
if (length < 256)
return AVERROR_INVALIDDATA;
dshift = get_bits_esc4(gb);
filter_order = 8 << get_bits1(gb);
dval1 = get_bits1(gb);
dval2 = get_bits1(gb);
for (i = 0; i < filter_order; i++) {
if (!(i & 3))
code_size = 14 - get_bits(gb, 3);
s->filter[i] = get_sbits(gb, code_size);
}
order_half = filter_order / 2;
length2 = length - (filter_order - 1);
/* decorrelate beginning samples */
if (dval1) {
for (i = 0; i < order_half; i++) {
int32_t a = p1[i];
int32_t b = p2[i];
p1[i] = a + b;
}
}
/* decorrelate ending samples */
if (dval2) {
for (i = length2 + order_half; i < length; i++) {
int32_t a = p1[i];
int32_t b = p2[i];
p1[i] = a + b;
}
}
for (i = 0; i < filter_order; i++)
s->residues[i] = *p2++ >> dshift;
p1 += order_half;
x = FF_ARRAY_ELEMS(s->residues) - filter_order;
for (; length2 > 0; length2 -= tmp) {
tmp = FFMIN(length2, x);
for (i = 0; i < tmp - (tmp == length2); i++)
s->residues[filter_order + i] = *p2++ >> dshift;
for (i = 0; i < tmp; i++) {
int v = 1 << 9;
if (filter_order == 16) {
v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
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];
}
v = av_clip_intp2(v >> 10, 13) * (1U << dshift) - *p1;
*p1++ = v;
}
memmove(s->residues, &s->residues[tmp], 2 * filter_order);
}
emms_c();
break;
}
}
if (s->dmode > 0 && s->dmode < 6) {
p1[0] = bp1;
p2[0] = bp2;
}
return 0;
}
static int tak_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *pkt)
{
TAKDecContext *s = avctx->priv_data;
AVFrame *frame = data;
GetBitContext *gb = &s->gb;
int chan, i, ret, hsize;
if (pkt->size < TAK_MIN_FRAME_HEADER_BYTES)
return AVERROR_INVALIDDATA;
if ((ret = init_get_bits8(gb, pkt->data, pkt->size)) < 0)
return ret;
if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0)
return ret;
hsize = get_bits_count(gb) / 8;
if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_COMPLIANT)) {
if (ff_tak_check_crc(pkt->data, hsize)) {
av_log(avctx, AV_LOG_ERROR, "CRC error\n");
if (avctx->err_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
}
}
if (s->ti.codec != TAK_CODEC_MONO_STEREO &&
s->ti.codec != TAK_CODEC_MULTICHANNEL) {
avpriv_report_missing_feature(avctx, "TAK codec type %d", 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 == TAK_CODEC_MONO_STEREO && 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;
}
avctx->bits_per_raw_sample = s->ti.bps;
if ((ret = set_bps_params(avctx)) < 0)
return ret;
if (s->ti.sample_rate != avctx->sample_rate) {
avctx->sample_rate = s->ti.sample_rate;
set_sample_rate_params(avctx);
}
av_channel_layout_uninit(&avctx->ch_layout);
if (s->ti.ch_layout) {
av_channel_layout_from_mask(&avctx->ch_layout, s->ti.ch_layout);
} else {
avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
avctx->ch_layout.nb_channels = s->ti.channels;
}
s->nb_samples = s->ti.last_frame_samples ? s->ti.last_frame_samples
: s->ti.frame_samples;
frame->nb_samples = s->nb_samples;
if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
return ret;
ff_thread_finish_setup(avctx);
if (avctx->bits_per_raw_sample <= 16) {
int buf_size = av_samples_get_buffer_size(NULL, avctx->ch_layout.nb_channels,
s->nb_samples,
AV_SAMPLE_FMT_S32P, 0);
if (buf_size < 0)
return buf_size;
av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size, buf_size);
if (!s->decode_buffer)
return AVERROR(ENOMEM);
ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL,
s->decode_buffer, avctx->ch_layout.nb_channels,
s->nb_samples, AV_SAMPLE_FMT_S32P, 0);
if (ret < 0)
return ret;
} else {
for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++)
s->decoded[chan] = (int32_t *)frame->extended_data[chan];
}
if (s->nb_samples < 16) {
for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++) {
int32_t *decoded = s->decoded[chan];
for (i = 0; i < s->nb_samples; i++)
decoded[i] = get_sbits(gb, avctx->bits_per_raw_sample);
}
} else {
if (s->ti.codec == TAK_CODEC_MONO_STEREO) {
for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++)
if (ret = decode_channel(s, chan))
return ret;
if (avctx->ch_layout.nb_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 == TAK_CODEC_MULTICHANNEL) {
if (get_bits1(gb)) {
int ch_mask = 0;
chan = get_bits(gb, 4) + 1;
if (chan > avctx->ch_layout.nb_channels)
return AVERROR_INVALIDDATA;
for (i = 0; i < chan; i++) {
int nbit = get_bits(gb, 4);
if (nbit >= avctx->ch_layout.nb_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].chan2 >= avctx->ch_layout.nb_channels) {
av_log(avctx, AV_LOG_ERROR,
"invalid channel 2 (%d) for %d channel(s)\n",
s->mcdparams[i].chan2, avctx->ch_layout.nb_channels);
return AVERROR_INVALIDDATA;
}
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->ch_layout.nb_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->ch_layout.nb_channels; chan++) {
int32_t *decoded = s->decoded[chan];
if (s->lpc_mode[chan])
decode_lpc(decoded, s->lpc_mode[chan], s->nb_samples);
if (s->sample_shift[chan] > 0)
for (i = 0; i < s->nb_samples; i++)
decoded[i] *= 1U << 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 | AV_EF_COMPLIANT)) {
if (ff_tak_check_crc(pkt->data + hsize,
get_bits_count(gb) / 8 - hsize)) {
av_log(avctx, AV_LOG_ERROR, "CRC error\n");
if (avctx->err_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
}
}
/* convert to output buffer */
switch (avctx->sample_fmt) {
case AV_SAMPLE_FMT_U8P:
for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++) {
uint8_t *samples = (uint8_t *)frame->extended_data[chan];
int32_t *decoded = s->decoded[chan];
for (i = 0; i < s->nb_samples; i++)
samples[i] = decoded[i] + 0x80U;
}
break;
case AV_SAMPLE_FMT_S16P:
for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++) {
int16_t *samples = (int16_t *)frame->extended_data[chan];
int32_t *decoded = s->decoded[chan];
for (i = 0; i < s->nb_samples; i++)
samples[i] = decoded[i];
}
break;
case AV_SAMPLE_FMT_S32P:
for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++) {
int32_t *samples = (int32_t *)frame->extended_data[chan];
for (i = 0; i < s->nb_samples; i++)
samples[i] *= 1U << 8;
}
break;
}
*got_frame_ptr = 1;
return pkt->size;
}
#if HAVE_THREADS
static int update_thread_context(AVCodecContext *dst,
const AVCodecContext *src)
{
TAKDecContext *tsrc = src->priv_data;
TAKDecContext *tdst = dst->priv_data;
if (dst == src)
return 0;
memcpy(&tdst->ti, &tsrc->ti, sizeof(TAKStreamInfo));
return 0;
}
#endif
static av_cold int tak_decode_close(AVCodecContext *avctx)
{
TAKDecContext *s = avctx->priv_data;
av_freep(&s->decode_buffer);
return 0;
}
const FFCodec ff_tak_decoder = {
.p.name = "tak",
.p.long_name = NULL_IF_CONFIG_SMALL("TAK (Tom's lossless Audio Kompressor)"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_TAK,
.priv_data_size = sizeof(TAKDecContext),
.init = tak_decode_init,
.close = tak_decode_close,
.decode = tak_decode_frame,
.update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_CHANNEL_CONF,
.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
AV_SAMPLE_FMT_S16P,
AV_SAMPLE_FMT_S32P,
AV_SAMPLE_FMT_NONE },
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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