WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/ffmpeg/libavcodec/takdec.c

Rev	Author	Line No.	Line
4349	Serge	1	/*
		2	* TAK decoder
		3	* Copyright (c) 2012 Paul B Mahol
		4	*
		5	* This file is part of FFmpeg.
		6	*
		7	* FFmpeg is free software; you can redistribute it and/or
		8	* modify it under the terms of the GNU Lesser General Public
		9	* License as published by the Free Software Foundation; either
		10	* version 2.1 of the License, or (at your option) any later version.
		11	*
		12	* FFmpeg is distributed in the hope that it will be useful,
		13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		15	* Lesser General Public License for more details.
		16	*
		17	* You should have received a copy of the GNU Lesser General Public
		18	* License along with FFmpeg; if not, write to the Free Software
		19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
		20	*/
		21
		22	/**
		23	* @file
		24	* TAK (Tom's lossless Audio Kompressor) decoder
		25	* @author Paul B Mahol
		26	*/
		27
		28	#include "libavutil/internal.h"
		29	#include "libavutil/samplefmt.h"
		30	#include "tak.h"
		31	#include "thread.h"
		32	#include "avcodec.h"
		33	#include "dsputil.h"
		34	#include "internal.h"
		35	#include "unary.h"
		36
		37	#define MAX_SUBFRAMES 8 ///< max number of subframes per channel
		38	#define MAX_PREDICTORS 256
		39
		40	typedef struct MCDParam {
		41	int8_t present; ///< decorrelation parameter availability for this channel
		42	int8_t index; ///< index into array of decorrelation types
		43	int8_t chan1;
		44	int8_t chan2;
		45	} MCDParam;
		46
		47	typedef struct TAKDecContext {
		48	AVCodecContext *avctx; ///< parent AVCodecContext
		49	DSPContext dsp;
		50	TAKStreamInfo ti;
		51	GetBitContext gb; ///< bitstream reader initialized to start at the current frame
		52
		53	int uval;
		54	int nb_samples; ///< number of samples in the current frame
		55	uint8_t *decode_buffer;
		56	unsigned int decode_buffer_size;
		57	int32_t *decoded[TAK_MAX_CHANNELS]; ///< decoded samples for each channel
		58
		59	int8_t lpc_mode[TAK_MAX_CHANNELS];
		60	int8_t sample_shift[TAK_MAX_CHANNELS]; ///< shift applied to every sample in the channel
		61	int16_t predictors[MAX_PREDICTORS];
		62	int nb_subframes; ///< number of subframes in the current frame
		63	int16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples
		64	int subframe_scale;
		65
		66	int8_t dmode; ///< channel decorrelation type in the current frame
		67
		68	MCDParam mcdparams[TAK_MAX_CHANNELS]; ///< multichannel decorrelation parameters
		69
		70	int8_t coding_mode[128];
		71	DECLARE_ALIGNED(16, int16_t, filter)[MAX_PREDICTORS];
		72	DECLARE_ALIGNED(16, int16_t, residues)[544];
		73	} TAKDecContext;
		74
		75	static const int8_t mc_dmodes[] = { 1, 3, 4, 6, };
		76
		77	static const uint16_t predictor_sizes[] = {
		78	4, 8, 12, 16, 24, 32, 48, 64, 80, 96, 128, 160, 192, 224, 256, 0,
		79	};
		80
		81	static const struct CParam {
		82	int init;
		83	int escape;
		84	int scale;
		85	int aescape;
		86	int bias;
		87	} xcodes[50] = {
		88	{ 0x01, 0x0000001, 0x0000001, 0x0000003, 0x0000008 },
		89	{ 0x02, 0x0000003, 0x0000001, 0x0000007, 0x0000006 },
		90	{ 0x03, 0x0000005, 0x0000002, 0x000000E, 0x000000D },
		91	{ 0x03, 0x0000003, 0x0000003, 0x000000D, 0x0000018 },
		92	{ 0x04, 0x000000B, 0x0000004, 0x000001C, 0x0000019 },
		93	{ 0x04, 0x0000006, 0x0000006, 0x000001A, 0x0000030 },
		94	{ 0x05, 0x0000016, 0x0000008, 0x0000038, 0x0000032 },
		95	{ 0x05, 0x000000C, 0x000000C, 0x0000034, 0x0000060 },
		96	{ 0x06, 0x000002C, 0x0000010, 0x0000070, 0x0000064 },
		97	{ 0x06, 0x0000018, 0x0000018, 0x0000068, 0x00000C0 },
		98	{ 0x07, 0x0000058, 0x0000020, 0x00000E0, 0x00000C8 },
		99	{ 0x07, 0x0000030, 0x0000030, 0x00000D0, 0x0000180 },
		100	{ 0x08, 0x00000B0, 0x0000040, 0x00001C0, 0x0000190 },
		101	{ 0x08, 0x0000060, 0x0000060, 0x00001A0, 0x0000300 },
		102	{ 0x09, 0x0000160, 0x0000080, 0x0000380, 0x0000320 },
		103	{ 0x09, 0x00000C0, 0x00000C0, 0x0000340, 0x0000600 },
		104	{ 0x0A, 0x00002C0, 0x0000100, 0x0000700, 0x0000640 },
		105	{ 0x0A, 0x0000180, 0x0000180, 0x0000680, 0x0000C00 },
		106	{ 0x0B, 0x0000580, 0x0000200, 0x0000E00, 0x0000C80 },
		107	{ 0x0B, 0x0000300, 0x0000300, 0x0000D00, 0x0001800 },
		108	{ 0x0C, 0x0000B00, 0x0000400, 0x0001C00, 0x0001900 },
		109	{ 0x0C, 0x0000600, 0x0000600, 0x0001A00, 0x0003000 },
		110	{ 0x0D, 0x0001600, 0x0000800, 0x0003800, 0x0003200 },
		111	{ 0x0D, 0x0000C00, 0x0000C00, 0x0003400, 0x0006000 },
		112	{ 0x0E, 0x0002C00, 0x0001000, 0x0007000, 0x0006400 },
		113	{ 0x0E, 0x0001800, 0x0001800, 0x0006800, 0x000C000 },
		114	{ 0x0F, 0x0005800, 0x0002000, 0x000E000, 0x000C800 },
		115	{ 0x0F, 0x0003000, 0x0003000, 0x000D000, 0x0018000 },
		116	{ 0x10, 0x000B000, 0x0004000, 0x001C000, 0x0019000 },
		117	{ 0x10, 0x0006000, 0x0006000, 0x001A000, 0x0030000 },
		118	{ 0x11, 0x0016000, 0x0008000, 0x0038000, 0x0032000 },
		119	{ 0x11, 0x000C000, 0x000C000, 0x0034000, 0x0060000 },
		120	{ 0x12, 0x002C000, 0x0010000, 0x0070000, 0x0064000 },
		121	{ 0x12, 0x0018000, 0x0018000, 0x0068000, 0x00C0000 },
		122	{ 0x13, 0x0058000, 0x0020000, 0x00E0000, 0x00C8000 },
		123	{ 0x13, 0x0030000, 0x0030000, 0x00D0000, 0x0180000 },
		124	{ 0x14, 0x00B0000, 0x0040000, 0x01C0000, 0x0190000 },
		125	{ 0x14, 0x0060000, 0x0060000, 0x01A0000, 0x0300000 },
		126	{ 0x15, 0x0160000, 0x0080000, 0x0380000, 0x0320000 },
		127	{ 0x15, 0x00C0000, 0x00C0000, 0x0340000, 0x0600000 },
		128	{ 0x16, 0x02C0000, 0x0100000, 0x0700000, 0x0640000 },
		129	{ 0x16, 0x0180000, 0x0180000, 0x0680000, 0x0C00000 },
		130	{ 0x17, 0x0580000, 0x0200000, 0x0E00000, 0x0C80000 },
		131	{ 0x17, 0x0300000, 0x0300000, 0x0D00000, 0x1800000 },
		132	{ 0x18, 0x0B00000, 0x0400000, 0x1C00000, 0x1900000 },
		133	{ 0x18, 0x0600000, 0x0600000, 0x1A00000, 0x3000000 },
		134	{ 0x19, 0x1600000, 0x0800000, 0x3800000, 0x3200000 },
		135	{ 0x19, 0x0C00000, 0x0C00000, 0x3400000, 0x6000000 },
		136	{ 0x1A, 0x2C00000, 0x1000000, 0x7000000, 0x6400000 },
		137	{ 0x1A, 0x1800000, 0x1800000, 0x6800000, 0xC000000 },
		138	};
		139
		140	static int set_bps_params(AVCodecContext *avctx)
		141	{
		142	switch (avctx->bits_per_raw_sample) {
		143	case 8:
		144	avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
		145	break;
		146	case 16:
		147	avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
		148	break;
		149	case 24:
		150	avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
		151	break;
		152	default:
		153	av_log(avctx, AV_LOG_ERROR, "invalid/unsupported bits per sample: %d\n",
		154	avctx->bits_per_raw_sample);
		155	return AVERROR_INVALIDDATA;
		156	}
		157
		158	return 0;
		159	}
		160
		161	static void set_sample_rate_params(AVCodecContext *avctx)
		162	{
		163	TAKDecContext *s = avctx->priv_data;
		164	int shift = 3 - (avctx->sample_rate / 11025);
		165	shift = FFMAX(0, shift);
		166	s->uval = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << shift;
		167	s->subframe_scale = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << 1;
		168	}
		169
		170	static av_cold int tak_decode_init(AVCodecContext *avctx)
		171	{
		172	TAKDecContext *s = avctx->priv_data;
		173
		174	ff_dsputil_init(&s->dsp, avctx);
		175
		176	s->avctx = avctx;
		177	avctx->bits_per_raw_sample = avctx->bits_per_coded_sample;
		178
		179	set_sample_rate_params(avctx);
		180
		181	return set_bps_params(avctx);
		182	}
		183
		184	static void decode_lpc(int32_t *coeffs, int mode, int length)
		185	{
		186	int i;
		187
		188	if (length < 2)
		189	return;
		190
		191	if (mode == 1) {
		192	int a1 = *coeffs++;
		193	for (i = 0; i < length - 1 >> 1; i++) {
		194	*coeffs += a1;
		195	coeffs[1] += *coeffs;
		196	a1 = coeffs[1];
		197	coeffs += 2;
		198	}
		199	if (length - 1 & 1)
		200	*coeffs += a1;
		201	} else if (mode == 2) {
		202	int a1 = coeffs[1];
		203	int a2 = a1 + *coeffs;
		204	coeffs[1] = a2;
		205	if (length > 2) {
		206	coeffs += 2;
		207	for (i = 0; i < length - 2 >> 1; i++) {
		208	int a3 = *coeffs + a1;
		209	int a4 = a3 + a2;
		210	*coeffs = a4;
		211	a1 = coeffs[1] + a3;
		212	a2 = a1 + a4;
		213	coeffs[1] = a2;
		214	coeffs += 2;
		215	}
		216	if (length & 1)
		217	*coeffs += a1 + a2;
		218	}
		219	} else if (mode == 3) {
		220	int a1 = coeffs[1];
		221	int a2 = a1 + *coeffs;
		222	coeffs[1] = a2;
		223	if (length > 2) {
		224	int a3 = coeffs[2];
		225	int a4 = a3 + a1;
		226	int a5 = a4 + a2;
		227	coeffs += 3;
		228	for (i = 0; i < length - 3; i++) {
		229	a3 += *coeffs;
		230	a4 += a3;
		231	a5 += a4;
		232	*coeffs = a5;
		233	coeffs++;
		234	}
		235	}
		236	}
		237	}
		238
		239	static int decode_segment(TAKDecContext s, int8_t mode, int32_t decoded, int len)
		240	{
		241	struct CParam code;
		242	GetBitContext *gb = &s->gb;
		243	int i;
		244
		245	if (!mode) {
		246	memset(decoded, 0, len * sizeof(*decoded));
		247	return 0;
		248	}
		249
		250	if (mode > FF_ARRAY_ELEMS(xcodes))
		251	return AVERROR_INVALIDDATA;
		252	code = xcodes[mode - 1];
		253
		254	for (i = 0; i < len; i++) {
		255	int x = get_bits_long(gb, code.init);
		256	if (x >= code.escape && get_bits1(gb)) {
		257	x \|= 1 << code.init;
		258	if (x >= code.aescape) {
		259	int scale = get_unary(gb, 1, 9);
		260	if (scale == 9) {
		261	int scale_bits = get_bits(gb, 3);
		262	if (scale_bits > 0) {
		263	if (scale_bits == 7) {
		264	scale_bits += get_bits(gb, 5);
		265	if (scale_bits > 29)
		266	return AVERROR_INVALIDDATA;
		267	}
		268	scale = get_bits_long(gb, scale_bits) + 1;
		269	x += code.scale * scale;
		270	}
		271	x += code.bias;
		272	} else
		273	x += code.scale * scale - code.escape;
		274	} else
		275	x -= code.escape;
		276	}
		277	decoded[i] = (x >> 1) ^ -(x & 1);
		278	}
		279
		280	return 0;
		281	}
		282
		283	static int decode_residues(TAKDecContext s, int32_t decoded, int length)
		284	{
		285	GetBitContext *gb = &s->gb;
		286	int i, mode, ret;
		287
		288	if (length > s->nb_samples)
		289	return AVERROR_INVALIDDATA;
		290
		291	if (get_bits1(gb)) {
		292	int wlength, rval;
		293
		294	wlength = length / s->uval;
		295
		296	rval = length - (wlength * s->uval);
		297
		298	if (rval < s->uval / 2)
		299	rval += s->uval;
		300	else
		301	wlength++;
		302
		303	if (wlength <= 1 \|\| wlength > 128)
		304	return AVERROR_INVALIDDATA;
		305
		306	s->coding_mode[0] = mode = get_bits(gb, 6);
		307
		308	for (i = 1; i < wlength; i++) {
		309	int c = get_unary(gb, 1, 6);
		310
		311	switch (c) {
		312	case 6:
		313	mode = get_bits(gb, 6);
		314	break;
		315	case 5:
		316	case 4:
		317	case 3: {
		318	/* mode += sign ? (1 - c) : (c - 1) */
		319	int sign = get_bits1(gb);
		320	mode += (-sign ^ (c - 1)) + sign;
		321	break;
		322	}
		323	case 2:
		324	mode++;
		325	break;
		326	case 1:
		327	mode--;
		328	break;
		329	}
		330	s->coding_mode[i] = mode;
		331	}
		332
		333	i = 0;
		334	while (i < wlength) {
		335	int len = 0;
		336
		337	mode = s->coding_mode[i];
		338	do {
		339	if (i >= wlength - 1)
		340	len += rval;
		341	else
		342	len += s->uval;
		343	i++;
		344
		345	if (i == wlength)
		346	break;
		347	} while (s->coding_mode[i] == mode);
		348
		349	if ((ret = decode_segment(s, mode, decoded, len)) < 0)
		350	return ret;
		351	decoded += len;
		352	}
		353	} else {
		354	mode = get_bits(gb, 6);
		355	if ((ret = decode_segment(s, mode, decoded, length)) < 0)
		356	return ret;
		357	}
		358
		359	return 0;
		360	}
		361
		362	static int get_bits_esc4(GetBitContext *gb)
		363	{
		364	if (get_bits1(gb))
		365	return get_bits(gb, 4) + 1;
		366	else
		367	return 0;
		368	}
		369
		370	static int decode_subframe(TAKDecContext s, int32_t decoded,
		371	int subframe_size, int prev_subframe_size)
		372	{
		373	GetBitContext *gb = &s->gb;
		374	int tmp, x, y, i, j, ret = 0;
		375	int dshift, size, filter_quant, filter_order;
		376	int tfilter[MAX_PREDICTORS];
		377
		378	if (!get_bits1(gb))
		379	return decode_residues(s, decoded, subframe_size);
		380
		381	filter_order = predictor_sizes[get_bits(gb, 4)];
		382
		383	if (prev_subframe_size > 0 && get_bits1(gb)) {
		384	if (filter_order > prev_subframe_size)
		385	return AVERROR_INVALIDDATA;
		386
		387	decoded -= filter_order;
		388	subframe_size += filter_order;
		389
		390	if (filter_order > subframe_size)
		391	return AVERROR_INVALIDDATA;
		392	} else {
		393	int lpc_mode;
		394
		395	if (filter_order > subframe_size)
		396	return AVERROR_INVALIDDATA;
		397
		398	lpc_mode = get_bits(gb, 2);
		399	if (lpc_mode > 2)
		400	return AVERROR_INVALIDDATA;
		401
		402	if ((ret = decode_residues(s, decoded, filter_order)) < 0)
		403	return ret;
		404
		405	if (lpc_mode)
		406	decode_lpc(decoded, lpc_mode, filter_order);
		407	}
		408
		409	dshift = get_bits_esc4(gb);
		410	size = get_bits1(gb) + 6;
		411
		412	filter_quant = 10;
		413	if (get_bits1(gb)) {
		414	filter_quant -= get_bits(gb, 3) + 1;
		415	if (filter_quant < 3)
		416	return AVERROR_INVALIDDATA;
		417	}
		418
		419	s->predictors[0] = get_sbits(gb, 10);
		420	s->predictors[1] = get_sbits(gb, 10);
		421	s->predictors[2] = get_sbits(gb, size) << (10 - size);
		422	s->predictors[3] = get_sbits(gb, size) << (10 - size);
		423	if (filter_order > 4) {
		424	tmp = size - get_bits1(gb);
		425
		426	for (i = 4; i < filter_order; i++) {
		427	if (!(i & 3))
		428	x = tmp - get_bits(gb, 2);
		429	s->predictors[i] = get_sbits(gb, x) << (10 - size);
		430	}
		431	}
		432
		433	tfilter[0] = s->predictors[0] << 6;
		434	for (i = 1; i < filter_order; i++) {
		435	int32_t *p1 = &tfilter[0];
		436	int32_t *p2 = &tfilter[i - 1];
		437
		438	for (j = 0; j < (i + 1) / 2; j++) {
		439	x = p1 + (s->predictors[i] *p2 + 256 >> 9);
		440	p2 += s->predictors[i] *p1 + 256 >> 9;
		441	*p1++ = x;
		442	p2--;
		443	}
		444
		445	tfilter[i] = s->predictors[i] << 6;
		446	}
		447
		448	x = 1 << (32 - (15 - filter_quant));
		449	y = 1 << ((15 - filter_quant) - 1);
		450	for (i = 0, j = filter_order - 1; i < filter_order / 2; i++, j--) {
		451	tmp = y + tfilter[j];
		452	s->filter[j] = x - ((tfilter[i] + y) >> (15 - filter_quant));
		453	s->filter[i] = x - ((tfilter[j] + y) >> (15 - filter_quant));
		454	}
		455
		456	if ((ret = decode_residues(s, &decoded[filter_order],
		457	subframe_size - filter_order)) < 0)
		458	return ret;
		459
		460	for (i = 0; i < filter_order; i++)
		461	s->residues[i] = *decoded++ >> dshift;
		462
		463	y = FF_ARRAY_ELEMS(s->residues) - filter_order;
		464	x = subframe_size - filter_order;
		465	while (x > 0) {
		466	tmp = FFMIN(y, x);
		467
		468	for (i = 0; i < tmp; i++) {
		469	int v = 1 << (filter_quant - 1);
		470
		471	if (filter_order & -16)
		472	v += s->dsp.scalarproduct_int16(&s->residues[i], s->filter,
		473	filter_order & -16);
		474	for (j = filter_order & -16; j < filter_order; j += 4) {
		475	v += s->residues[i + j + 3] * s->filter[j + 3] +
		476	s->residues[i + j + 2] * s->filter[j + 2] +
		477	s->residues[i + j + 1] * s->filter[j + 1] +
		478	s->residues[i + j ] * s->filter[j ];
		479	}
		480	v = (av_clip(v >> filter_quant, -8192, 8191) << dshift) - *decoded;
		481	*decoded++ = v;
		482	s->residues[filter_order + i] = v >> dshift;
		483	}
		484
		485	x -= tmp;
		486	if (x > 0)
		487	memcpy(s->residues, &s->residues[y], 2 * filter_order);
		488	}
		489
		490	emms_c();
		491
		492	return 0;
		493	}
		494
		495	static int decode_channel(TAKDecContext *s, int chan)
		496	{
		497	AVCodecContext *avctx = s->avctx;
		498	GetBitContext *gb = &s->gb;
		499	int32_t *decoded = s->decoded[chan];
		500	int left = s->nb_samples - 1;
		501	int i = 0, ret, prev = 0;
		502
		503	s->sample_shift[chan] = get_bits_esc4(gb);
		504	if (s->sample_shift[chan] >= avctx->bits_per_raw_sample)
		505	return AVERROR_INVALIDDATA;
		506
		507	*decoded++ = get_sbits(gb, avctx->bits_per_raw_sample - s->sample_shift[chan]);
		508	s->lpc_mode[chan] = get_bits(gb, 2);
		509	s->nb_subframes = get_bits(gb, 3) + 1;
		510
		511	if (s->nb_subframes > 1) {
		512	if (get_bits_left(gb) < (s->nb_subframes - 1) * 6)
		513	return AVERROR_INVALIDDATA;
		514
		515	for (; i < s->nb_subframes - 1; i++) {
		516	int v = get_bits(gb, 6);
		517
		518	s->subframe_len[i] = (v - prev) * s->subframe_scale;
		519	if (s->subframe_len[i] <= 0)
		520	return AVERROR_INVALIDDATA;
		521
		522	left -= s->subframe_len[i];
		523	prev = v;
		524	}
		525
		526	if (left <= 0)
		527	return AVERROR_INVALIDDATA;
		528	}
		529	s->subframe_len[i] = left;
		530
		531	prev = 0;
		532	for (i = 0; i < s->nb_subframes; i++) {
		533	if ((ret = decode_subframe(s, decoded, s->subframe_len[i], prev)) < 0)
		534	return ret;
		535	decoded += s->subframe_len[i];
		536	prev = s->subframe_len[i];
		537	}
		538
		539	return 0;
		540	}
		541
		542	static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
		543	{
		544	GetBitContext *gb = &s->gb;
		545	int32_t *p1 = s->decoded[c1] + 1;
		546	int32_t *p2 = s->decoded[c2] + 1;
		547	int i;
		548	int dshift, dfactor;
		549
		550	switch (s->dmode) {
		551	case 1: /* left/side */
		552	for (i = 0; i < length; i++) {
		553	int32_t a = p1[i];
		554	int32_t b = p2[i];
		555	p2[i] = a + b;
		556	}
		557	break;
		558	case 2: /* side/right */
		559	for (i = 0; i < length; i++) {
		560	int32_t a = p1[i];
		561	int32_t b = p2[i];
		562	p1[i] = b - a;
		563	}
		564	break;
		565	case 3: /* side/mid */
		566	for (i = 0; i < length; i++) {
		567	int32_t a = p1[i];
		568	int32_t b = p2[i];
		569	a -= b >> 1;
		570	p1[i] = a;
		571	p2[i] = a + b;
		572	}
		573	break;
		574	case 4: /* side/left with scale factor */
		575	FFSWAP(int32_t*, p1, p2);
		576	case 5: /* side/right with scale factor */
		577	dshift = get_bits_esc4(gb);
		578	dfactor = get_sbits(gb, 10);
		579	for (i = 0; i < length; i++) {
		580	int32_t a = p1[i];
		581	int32_t b = p2[i];
		582	b = dfactor * (b >> dshift) + 128 >> 8 << dshift;
		583	p1[i] = b - a;
		584	}
		585	break;
		586	case 6:
		587	FFSWAP(int32_t*, p1, p2);
		588	case 7: {
		589	int length2, order_half, filter_order, dval1, dval2;
		590	int tmp, x, code_size;
		591
		592	if (length < 256)
		593	return AVERROR_INVALIDDATA;
		594
		595	dshift = get_bits_esc4(gb);
		596	filter_order = 8 << get_bits1(gb);
		597	dval1 = get_bits1(gb);
		598	dval2 = get_bits1(gb);
		599
		600	for (i = 0; i < filter_order; i++) {
		601	if (!(i & 3))
		602	code_size = 14 - get_bits(gb, 3);
		603	s->filter[i] = get_sbits(gb, code_size);
		604	}
		605
		606	order_half = filter_order / 2;
		607	length2 = length - (filter_order - 1);
		608
		609	/* decorrelate beginning samples */
		610	if (dval1) {
		611	for (i = 0; i < order_half; i++) {
		612	int32_t a = p1[i];
		613	int32_t b = p2[i];
		614	p1[i] = a + b;
		615	}
		616	}
		617
		618	/* decorrelate ending samples */
		619	if (dval2) {
		620	for (i = length2 + order_half; i < length; i++) {
		621	int32_t a = p1[i];
		622	int32_t b = p2[i];
		623	p1[i] = a + b;
		624	}
		625	}
		626
		627
		628	for (i = 0; i < filter_order; i++)
		629	s->residues[i] = *p2++ >> dshift;
		630
		631	p1 += order_half;
		632	x = FF_ARRAY_ELEMS(s->residues) - filter_order;
		633	for (; length2 > 0; length2 -= tmp) {
		634	tmp = FFMIN(length2, x);
		635
		636	for (i = 0; i < tmp; i++)
		637	s->residues[filter_order + i] = *p2++ >> dshift;
		638
		639	for (i = 0; i < tmp; i++) {
		640	int v = 1 << 9;
		641
		642	if (filter_order == 16) {
		643	v += s->dsp.scalarproduct_int16(&s->residues[i], s->filter,
		644	filter_order);
		645	} else {
		646	v += s->residues[i + 7] * s->filter[7] +
		647	s->residues[i + 6] * s->filter[6] +
		648	s->residues[i + 5] * s->filter[5] +
		649	s->residues[i + 4] * s->filter[4] +
		650	s->residues[i + 3] * s->filter[3] +
		651	s->residues[i + 2] * s->filter[2] +
		652	s->residues[i + 1] * s->filter[1] +
		653	s->residues[i ] * s->filter[0];
		654	}
		655
		656	v = (av_clip(v >> 10, -8192, 8191) << dshift) - *p1;
		657	*p1++ = v;
		658	}
		659
		660	memcpy(s->residues, &s->residues[tmp], 2 * filter_order);
		661	}
		662
		663	emms_c();
		664	break;
		665	}
		666	}
		667
		668	return 0;
		669	}
		670
		671	static int tak_decode_frame(AVCodecContext avctx, void data,
		672	int got_frame_ptr, AVPacket pkt)
		673	{
		674	TAKDecContext *s = avctx->priv_data;
		675	AVFrame *frame = data;
		676	ThreadFrame tframe = { .f = data };
		677	GetBitContext *gb = &s->gb;
		678	int chan, i, ret, hsize;
		679
		680	if (pkt->size < TAK_MIN_FRAME_HEADER_BYTES)
		681	return AVERROR_INVALIDDATA;
		682
		683	if ((ret = init_get_bits8(gb, pkt->data, pkt->size)) < 0)
		684	return ret;
		685
		686	if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0)
		687	return ret;
		688
		689	if (avctx->err_recognition & (AV_EF_CRCCHECK\|AV_EF_COMPLIANT)) {
		690	hsize = get_bits_count(gb) / 8;
		691	if (ff_tak_check_crc(pkt->data, hsize)) {
		692	av_log(avctx, AV_LOG_ERROR, "CRC error\n");
		693	return AVERROR_INVALIDDATA;
		694	}
		695	}
		696
		697	if (s->ti.codec != TAK_CODEC_MONO_STEREO &&
		698	s->ti.codec != TAK_CODEC_MULTICHANNEL) {
		699	av_log(avctx, AV_LOG_ERROR, "unsupported codec: %d\n", s->ti.codec);
		700	return AVERROR_PATCHWELCOME;
		701	}
		702	if (s->ti.data_type) {
		703	av_log(avctx, AV_LOG_ERROR,
		704	"unsupported data type: %d\n", s->ti.data_type);
		705	return AVERROR_INVALIDDATA;
		706	}
		707	if (s->ti.codec == TAK_CODEC_MONO_STEREO && s->ti.channels > 2) {
		708	av_log(avctx, AV_LOG_ERROR,
		709	"invalid number of channels: %d\n", s->ti.channels);
		710	return AVERROR_INVALIDDATA;
		711	}
		712	if (s->ti.channels > 6) {
		713	av_log(avctx, AV_LOG_ERROR,
		714	"unsupported number of channels: %d\n", s->ti.channels);
		715	return AVERROR_INVALIDDATA;
		716	}
		717
		718	if (s->ti.frame_samples <= 0) {
		719	av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of samples\n");
		720	return AVERROR_INVALIDDATA;
		721	}
		722
		723	if (s->ti.bps != avctx->bits_per_raw_sample) {
		724	avctx->bits_per_raw_sample = s->ti.bps;
		725	if ((ret = set_bps_params(avctx)) < 0)
		726	return ret;
		727	}
		728	if (s->ti.sample_rate != avctx->sample_rate) {
		729	avctx->sample_rate = s->ti.sample_rate;
		730	set_sample_rate_params(avctx);
		731	}
		732	if (s->ti.ch_layout)
		733	avctx->channel_layout = s->ti.ch_layout;
		734	avctx->channels = s->ti.channels;
		735
		736	s->nb_samples = s->ti.last_frame_samples ? s->ti.last_frame_samples
		737	: s->ti.frame_samples;
		738
		739	frame->nb_samples = s->nb_samples;
		740	if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
		741	return ret;
		742	ff_thread_finish_setup(avctx);
		743
		744	if (avctx->bits_per_raw_sample <= 16) {
		745	int buf_size = av_samples_get_buffer_size(NULL, avctx->channels,
		746	s->nb_samples,
		747	AV_SAMPLE_FMT_S32P, 0);
		748	av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size, buf_size);
		749	if (!s->decode_buffer)
		750	return AVERROR(ENOMEM);
		751	ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL,
		752	s->decode_buffer, avctx->channels,
		753	s->nb_samples, AV_SAMPLE_FMT_S32P, 0);
		754	if (ret < 0)
		755	return ret;
		756	} else {
		757	for (chan = 0; chan < avctx->channels; chan++)
		758	s->decoded[chan] = (int32_t *)frame->extended_data[chan];
		759	}
		760
		761	if (s->nb_samples < 16) {
		762	for (chan = 0; chan < avctx->channels; chan++) {
		763	int32_t *decoded = s->decoded[chan];
		764	for (i = 0; i < s->nb_samples; i++)
		765	decoded[i] = get_sbits(gb, avctx->bits_per_raw_sample);
		766	}
		767	} else {
		768	if (s->ti.codec == TAK_CODEC_MONO_STEREO) {
		769	for (chan = 0; chan < avctx->channels; chan++)
		770	if (ret = decode_channel(s, chan))
		771	return ret;
		772
		773	if (avctx->channels == 2) {
		774	s->nb_subframes = get_bits(gb, 1) + 1;
		775	if (s->nb_subframes > 1) {
		776	s->subframe_len[1] = get_bits(gb, 6);
		777	}
		778
		779	s->dmode = get_bits(gb, 3);
		780	if (ret = decorrelate(s, 0, 1, s->nb_samples - 1))
		781	return ret;
		782	}
		783	} else if (s->ti.codec == TAK_CODEC_MULTICHANNEL) {
		784	if (get_bits1(gb)) {
		785	int ch_mask = 0;
		786
		787	chan = get_bits(gb, 4) + 1;
		788	if (chan > avctx->channels)
		789	return AVERROR_INVALIDDATA;
		790
		791	for (i = 0; i < chan; i++) {
		792	int nbit = get_bits(gb, 4);
		793
		794	if (nbit >= avctx->channels)
		795	return AVERROR_INVALIDDATA;
		796
		797	if (ch_mask & 1 << nbit)
		798	return AVERROR_INVALIDDATA;
		799
		800	s->mcdparams[i].present = get_bits1(gb);
		801	if (s->mcdparams[i].present) {
		802	s->mcdparams[i].index = get_bits(gb, 2);
		803	s->mcdparams[i].chan2 = get_bits(gb, 4);
		804	if (s->mcdparams[i].index == 1) {
		805	if ((nbit == s->mcdparams[i].chan2) \|\|
		806	(ch_mask & 1 << s->mcdparams[i].chan2))
		807	return AVERROR_INVALIDDATA;
		808
		809	ch_mask \|= 1 << s->mcdparams[i].chan2;
		810	} else if (!(ch_mask & 1 << s->mcdparams[i].chan2)) {
		811	return AVERROR_INVALIDDATA;
		812	}
		813	}
		814	s->mcdparams[i].chan1 = nbit;
		815
		816	ch_mask \|= 1 << nbit;
		817	}
		818	} else {
		819	chan = avctx->channels;
		820	for (i = 0; i < chan; i++) {
		821	s->mcdparams[i].present = 0;
		822	s->mcdparams[i].chan1 = i;
		823	}
		824	}
		825
		826	for (i = 0; i < chan; i++) {
		827	if (s->mcdparams[i].present && s->mcdparams[i].index == 1)
		828	if (ret = decode_channel(s, s->mcdparams[i].chan2))
		829	return ret;
		830
		831	if (ret = decode_channel(s, s->mcdparams[i].chan1))
		832	return ret;
		833
		834	if (s->mcdparams[i].present) {
		835	s->dmode = mc_dmodes[s->mcdparams[i].index];
		836	if (ret = decorrelate(s,
		837	s->mcdparams[i].chan2,
		838	s->mcdparams[i].chan1,
		839	s->nb_samples - 1))
		840	return ret;
		841	}
		842	}
		843	}
		844
		845	for (chan = 0; chan < avctx->channels; chan++) {
		846	int32_t *decoded = s->decoded[chan];
		847
		848	if (s->lpc_mode[chan])
		849	decode_lpc(decoded, s->lpc_mode[chan], s->nb_samples);
		850
		851	if (s->sample_shift[chan] > 0)
		852	for (i = 0; i < s->nb_samples; i++)
		853	decoded[i] <<= s->sample_shift[chan];
		854	}
		855	}
		856
		857	align_get_bits(gb);
		858	skip_bits(gb, 24);
		859	if (get_bits_left(gb) < 0)
		860	av_log(avctx, AV_LOG_DEBUG, "overread\n");
		861	else if (get_bits_left(gb) > 0)
		862	av_log(avctx, AV_LOG_DEBUG, "underread\n");
		863
		864	if (avctx->err_recognition & (AV_EF_CRCCHECK \| AV_EF_COMPLIANT)) {
		865	if (ff_tak_check_crc(pkt->data + hsize,
		866	get_bits_count(gb) / 8 - hsize)) {
		867	av_log(avctx, AV_LOG_ERROR, "CRC error\n");
		868	return AVERROR_INVALIDDATA;
		869	}
		870	}
		871
		872	/* convert to output buffer */
		873	switch (avctx->sample_fmt) {
		874	case AV_SAMPLE_FMT_U8P:
		875	for (chan = 0; chan < avctx->channels; chan++) {
		876	uint8_t samples = (uint8_t )frame->extended_data[chan];
		877	int32_t *decoded = s->decoded[chan];
		878	for (i = 0; i < s->nb_samples; i++)
		879	samples[i] = decoded[i] + 0x80;
		880	}
		881	break;
		882	case AV_SAMPLE_FMT_S16P:
		883	for (chan = 0; chan < avctx->channels; chan++) {
		884	int16_t samples = (int16_t )frame->extended_data[chan];
		885	int32_t *decoded = s->decoded[chan];
		886	for (i = 0; i < s->nb_samples; i++)
		887	samples[i] = decoded[i];
		888	}
		889	break;
		890	case AV_SAMPLE_FMT_S32P:
		891	for (chan = 0; chan < avctx->channels; chan++) {
		892	int32_t samples = (int32_t )frame->extended_data[chan];
		893	for (i = 0; i < s->nb_samples; i++)
		894	samples[i] <<= 8;
		895	}
		896	break;
		897	}
		898
		899	*got_frame_ptr = 1;
		900
		901	return pkt->size;
		902	}
		903
		904	static int init_thread_copy(AVCodecContext *avctx)
		905	{
		906	TAKDecContext *s = avctx->priv_data;
		907	s->avctx = avctx;
		908	return 0;
		909	}
		910
		911	static int update_thread_context(AVCodecContext *dst,
		912	const AVCodecContext *src)
		913	{
		914	TAKDecContext *tsrc = src->priv_data;
		915	TAKDecContext *tdst = dst->priv_data;
		916
		917	if (dst == src)
		918	return 0;
		919	memcpy(&tdst->ti, &tsrc->ti, sizeof(TAKStreamInfo));
		920	return 0;
		921	}
		922
		923	static av_cold int tak_decode_close(AVCodecContext *avctx)
		924	{
		925	TAKDecContext *s = avctx->priv_data;
		926
		927	av_freep(&s->decode_buffer);
		928
		929	return 0;
		930	}
		931
		932	AVCodec ff_tak_decoder = {
		933	.name = "tak",
		934	.long_name = NULL_IF_CONFIG_SMALL("TAK (Tom's lossless Audio Kompressor)"),
		935	.type = AVMEDIA_TYPE_AUDIO,
		936	.id = AV_CODEC_ID_TAK,
		937	.priv_data_size = sizeof(TAKDecContext),
		938	.init = tak_decode_init,
		939	.close = tak_decode_close,
		940	.decode = tak_decode_frame,
		941	.init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
		942	.update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
		943	.capabilities = CODEC_CAP_DR1 \| CODEC_CAP_FRAME_THREADS,
		944	.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
		945	AV_SAMPLE_FMT_S16P,
		946	AV_SAMPLE_FMT_S32P,
		947	AV_SAMPLE_FMT_NONE },
		948	};

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(root)/contrib/sdk/sources/ffmpeg/libavcodec/takdec.c – Rev 4349