WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavcodec/aacsbr.c

Rev	Author	Line No.	Line
6148	serge	1	/*
		2	* AAC Spectral Band Replication decoding functions
		3	* Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
		4	* Copyright (c) 2009-2010 Alex Converse
		5	*
		6	* This file is part of FFmpeg.
		7	*
		8	* FFmpeg is free software; you can redistribute it and/or
		9	* modify it under the terms of the GNU Lesser General Public
		10	* License as published by the Free Software Foundation; either
		11	* version 2.1 of the License, or (at your option) any later version.
		12	*
		13	* FFmpeg is distributed in the hope that it will be useful,
		14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		16	* Lesser General Public License for more details.
		17	*
		18	* You should have received a copy of the GNU Lesser General Public
		19	* License along with FFmpeg; if not, write to the Free Software
		20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
		21	*/
		22
		23	/**
		24	* @file
		25	* AAC Spectral Band Replication decoding functions
		26	* @author Robert Swain ( rob opendot cl )
		27	*/
		28
		29	#include "aac.h"
		30	#include "sbr.h"
		31	#include "aacsbr.h"
		32	#include "aacsbrdata.h"
		33	#include "fft.h"
		34	#include "aacps.h"
		35	#include "sbrdsp.h"
		36	#include "libavutil/internal.h"
		37	#include "libavutil/libm.h"
		38	#include "libavutil/avassert.h"
		39
		40	#include
		41	#include
		42	#include
		43
		44	#define ENVELOPE_ADJUSTMENT_OFFSET 2
		45	#define NOISE_FLOOR_OFFSET 6.0f
		46
		47	#if ARCH_MIPS
		48	#include "mips/aacsbr_mips.h"
		49	#endif /* ARCH_MIPS */
		50
		51	/**
		52	* SBR VLC tables
		53	*/
		54	enum {
		55	T_HUFFMAN_ENV_1_5DB,
		56	F_HUFFMAN_ENV_1_5DB,
		57	T_HUFFMAN_ENV_BAL_1_5DB,
		58	F_HUFFMAN_ENV_BAL_1_5DB,
		59	T_HUFFMAN_ENV_3_0DB,
		60	F_HUFFMAN_ENV_3_0DB,
		61	T_HUFFMAN_ENV_BAL_3_0DB,
		62	F_HUFFMAN_ENV_BAL_3_0DB,
		63	T_HUFFMAN_NOISE_3_0DB,
		64	T_HUFFMAN_NOISE_BAL_3_0DB,
		65	};
		66
		67	/**
		68	* bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
		69	*/
		70	enum {
		71	FIXFIX,
		72	FIXVAR,
		73	VARFIX,
		74	VARVAR,
		75	};
		76
		77	enum {
		78	EXTENSION_ID_PS = 2,
		79	};
		80
		81	static VLC vlc_sbr[10];
		82	static const int8_t vlc_sbr_lav[10] =
		83	{ 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
		84
		85	#define SBR_INIT_VLC_STATIC(num, size) \
		86	INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \
		87	sbr_tmp[num].sbr_bits , 1, 1, \
		88	sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \
		89	size)
		90
		91	#define SBR_VLC_ROW(name) \
		92	{ name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
		93
		94	static void aacsbr_func_ptr_init(AACSBRContext *c);
		95
		96	av_cold void ff_aac_sbr_init(void)
		97	{
		98	int n;
		99	static const struct {
		100	const void sbr_codes, sbr_bits;
		101	const unsigned int table_size, elem_size;
		102	} sbr_tmp[] = {
		103	SBR_VLC_ROW(t_huffman_env_1_5dB),
		104	SBR_VLC_ROW(f_huffman_env_1_5dB),
		105	SBR_VLC_ROW(t_huffman_env_bal_1_5dB),
		106	SBR_VLC_ROW(f_huffman_env_bal_1_5dB),
		107	SBR_VLC_ROW(t_huffman_env_3_0dB),
		108	SBR_VLC_ROW(f_huffman_env_3_0dB),
		109	SBR_VLC_ROW(t_huffman_env_bal_3_0dB),
		110	SBR_VLC_ROW(f_huffman_env_bal_3_0dB),
		111	SBR_VLC_ROW(t_huffman_noise_3_0dB),
		112	SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),
		113	};
		114
		115	// SBR VLC table initialization
		116	SBR_INIT_VLC_STATIC(0, 1098);
		117	SBR_INIT_VLC_STATIC(1, 1092);
		118	SBR_INIT_VLC_STATIC(2, 768);
		119	SBR_INIT_VLC_STATIC(3, 1026);
		120	SBR_INIT_VLC_STATIC(4, 1058);
		121	SBR_INIT_VLC_STATIC(5, 1052);
		122	SBR_INIT_VLC_STATIC(6, 544);
		123	SBR_INIT_VLC_STATIC(7, 544);
		124	SBR_INIT_VLC_STATIC(8, 592);
		125	SBR_INIT_VLC_STATIC(9, 512);
		126
		127	for (n = 1; n < 320; n++)
		128	sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n];
		129	sbr_qmf_window_us[384] = -sbr_qmf_window_us[384];
		130	sbr_qmf_window_us[512] = -sbr_qmf_window_us[512];
		131
		132	for (n = 0; n < 320; n++)
		133	sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n];
		134
		135	ff_ps_init();
		136	}
		137
		138	/** Places SBR in pure upsampling mode. */
		139	static void sbr_turnoff(SpectralBandReplication *sbr) {
		140	sbr->start = 0;
		141	// Init defults used in pure upsampling mode
		142	sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
		143	sbr->m[1] = 0;
		144	// Reset values for first SBR header
		145	sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;
		146	memset(&sbr->spectrum_params, -1, sizeof(SpectrumParameters));
		147	}
		148
		149	av_cold void ff_aac_sbr_ctx_init(AACContext ac, SpectralBandReplication sbr)
		150	{
		151	if(sbr->mdct.mdct_bits)
		152	return;
		153	sbr->kx[0] = sbr->kx[1];
		154	sbr_turnoff(sbr);
		155	sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
		156	sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
		157	/* SBR requires samples to be scaled to +/-32768.0 to work correctly.
		158	* mdct scale factors are adjusted to scale up from +/-1.0 at analysis
		159	* and scale back down at synthesis. */
		160	ff_mdct_init(&sbr->mdct, 7, 1, 1.0 / (64 * 32768.0));
		161	ff_mdct_init(&sbr->mdct_ana, 7, 1, -2.0 * 32768.0);
		162	ff_ps_ctx_init(&sbr->ps);
		163	ff_sbrdsp_init(&sbr->dsp);
		164	aacsbr_func_ptr_init(&sbr->c);
		165	}
		166
		167	av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
		168	{
		169	ff_mdct_end(&sbr->mdct);
		170	ff_mdct_end(&sbr->mdct_ana);
		171	}
		172
		173	static int qsort_comparison_function_int16(const void a, const void b)
		174	{
		175	return (const int16_t )a - (const int16_t )b;
		176	}
		177
		178	static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
		179	{
		180	int i;
		181	for (i = 0; i <= last_el; i++)
		182	if (table[i] == needle)
		183	return 1;
		184	return 0;
		185	}
		186
		187	/// Limiter Frequency Band Table (14496-3 sp04 p198)
		188	static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
		189	{
		190	int k;
		191	if (sbr->bs_limiter_bands > 0) {
		192	static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2)
		193	1.18509277094158210129f, //2^(0.49/2)
		194	1.11987160404675912501f }; //2^(0.49/3)
		195	const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
		196	int16_t patch_borders[7];
		197	uint16_t in = sbr->f_tablelim + 1, out = sbr->f_tablelim;
		198
		199	patch_borders[0] = sbr->kx[1];
		200	for (k = 1; k <= sbr->num_patches; k++)
		201	patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
		202
		203	memcpy(sbr->f_tablelim, sbr->f_tablelow,
		204	(sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
		205	if (sbr->num_patches > 1)
		206	memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
		207	(sbr->num_patches - 1) * sizeof(patch_borders[0]));
		208
		209	qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
		210	sizeof(sbr->f_tablelim[0]),
		211	qsort_comparison_function_int16);
		212
		213	sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
		214	while (out < sbr->f_tablelim + sbr->n_lim) {
		215	if (in >= out * lim_bands_per_octave_warped) {
		216	++out = in++;
		217	} else if (in == out \|\|
		218	!in_table_int16(patch_borders, sbr->num_patches, *in)) {
		219	in++;
		220	sbr->n_lim--;
		221	} else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
		222	out = in++;
		223	sbr->n_lim--;
		224	} else {
		225	++out = in++;
		226	}
		227	}
		228	} else {
		229	sbr->f_tablelim[0] = sbr->f_tablelow[0];
		230	sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
		231	sbr->n_lim = 1;
		232	}
		233	}
		234
		235	static unsigned int read_sbr_header(SpectralBandReplication sbr, GetBitContext gb)
		236	{
		237	unsigned int cnt = get_bits_count(gb);
		238	uint8_t bs_header_extra_1;
		239	uint8_t bs_header_extra_2;
		240	int old_bs_limiter_bands = sbr->bs_limiter_bands;
		241	SpectrumParameters old_spectrum_params;
		242
		243	sbr->start = 1;
		244
		245	// Save last spectrum parameters variables to compare to new ones
		246	memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
		247
		248	sbr->bs_amp_res_header = get_bits1(gb);
		249	sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
		250	sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
		251	sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
		252	skip_bits(gb, 2); // bs_reserved
		253
		254	bs_header_extra_1 = get_bits1(gb);
		255	bs_header_extra_2 = get_bits1(gb);
		256
		257	if (bs_header_extra_1) {
		258	sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
		259	sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
		260	sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
		261	} else {
		262	sbr->spectrum_params.bs_freq_scale = 2;
		263	sbr->spectrum_params.bs_alter_scale = 1;
		264	sbr->spectrum_params.bs_noise_bands = 2;
		265	}
		266
		267	// Check if spectrum parameters changed
		268	if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
		269	sbr->reset = 1;
		270
		271	if (bs_header_extra_2) {
		272	sbr->bs_limiter_bands = get_bits(gb, 2);
		273	sbr->bs_limiter_gains = get_bits(gb, 2);
		274	sbr->bs_interpol_freq = get_bits1(gb);
		275	sbr->bs_smoothing_mode = get_bits1(gb);
		276	} else {
		277	sbr->bs_limiter_bands = 2;
		278	sbr->bs_limiter_gains = 2;
		279	sbr->bs_interpol_freq = 1;
		280	sbr->bs_smoothing_mode = 1;
		281	}
		282
		283	if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
		284	sbr_make_f_tablelim(sbr);
		285
		286	return get_bits_count(gb) - cnt;
		287	}
		288
		289	static int array_min_int16(const int16_t *array, int nel)
		290	{
		291	int i, min = array[0];
		292	for (i = 1; i < nel; i++)
		293	min = FFMIN(array[i], min);
		294	return min;
		295	}
		296
		297	static void make_bands(int16_t* bands, int start, int stop, int num_bands)
		298	{
		299	int k, previous, present;
		300	float base, prod;
		301
		302	base = powf((float)stop / start, 1.0f / num_bands);
		303	prod = start;
		304	previous = start;
		305
		306	for (k = 0; k < num_bands-1; k++) {
		307	prod *= base;
		308	present = lrintf(prod);
		309	bands[k] = present - previous;
		310	previous = present;
		311	}
		312	bands[num_bands-1] = stop - previous;
		313	}
		314
		315	static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)
		316	{
		317	// Requirements (14496-3 sp04 p205)
		318	if (n_master <= 0) {
		319	av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
		320	return -1;
		321	}
		322	if (bs_xover_band >= n_master) {
		323	av_log(avctx, AV_LOG_ERROR,
		324	"Invalid bitstream, crossover band index beyond array bounds: %d\n",
		325	bs_xover_band);
		326	return -1;
		327	}
		328	return 0;
		329	}
		330
		331	/// Master Frequency Band Table (14496-3 sp04 p194)
		332	static int sbr_make_f_master(AACContext ac, SpectralBandReplication sbr,
		333	SpectrumParameters *spectrum)
		334	{
		335	unsigned int temp, max_qmf_subbands;
		336	unsigned int start_min, stop_min;
		337	int k;
		338	const int8_t *sbr_offset_ptr;
		339	int16_t stop_dk[13];
		340
		341	if (sbr->sample_rate < 32000) {
		342	temp = 3000;
		343	} else if (sbr->sample_rate < 64000) {
		344	temp = 4000;
		345	} else
		346	temp = 5000;
		347
		348	switch (sbr->sample_rate) {
		349	case 16000:
		350	sbr_offset_ptr = sbr_offset[0];
		351	break;
		352	case 22050:
		353	sbr_offset_ptr = sbr_offset[1];
		354	break;
		355	case 24000:
		356	sbr_offset_ptr = sbr_offset[2];
		357	break;
		358	case 32000:
		359	sbr_offset_ptr = sbr_offset[3];
		360	break;
		361	case 44100: case 48000: case 64000:
		362	sbr_offset_ptr = sbr_offset[4];
		363	break;
		364	case 88200: case 96000: case 128000: case 176400: case 192000:
		365	sbr_offset_ptr = sbr_offset[5];
		366	break;
		367	default:
		368	av_log(ac->avctx, AV_LOG_ERROR,
		369	"Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
		370	return -1;
		371	}
		372
		373	start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
		374	stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
		375
		376	sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
		377
		378	if (spectrum->bs_stop_freq < 14) {
		379	sbr->k[2] = stop_min;
		380	make_bands(stop_dk, stop_min, 64, 13);
		381	qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
		382	for (k = 0; k < spectrum->bs_stop_freq; k++)
		383	sbr->k[2] += stop_dk[k];
		384	} else if (spectrum->bs_stop_freq == 14) {
		385	sbr->k[2] = 2*sbr->k[0];
		386	} else if (spectrum->bs_stop_freq == 15) {
		387	sbr->k[2] = 3*sbr->k[0];
		388	} else {
		389	av_log(ac->avctx, AV_LOG_ERROR,
		390	"Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
		391	return -1;
		392	}
		393	sbr->k[2] = FFMIN(64, sbr->k[2]);
		394
		395	// Requirements (14496-3 sp04 p205)
		396	if (sbr->sample_rate <= 32000) {
		397	max_qmf_subbands = 48;
		398	} else if (sbr->sample_rate == 44100) {
		399	max_qmf_subbands = 35;
		400	} else if (sbr->sample_rate >= 48000)
		401	max_qmf_subbands = 32;
		402	else
		403	av_assert0(0);
		404
		405	if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
		406	av_log(ac->avctx, AV_LOG_ERROR,
		407	"Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
		408	return -1;
		409	}
		410
		411	if (!spectrum->bs_freq_scale) {
		412	int dk, k2diff;
		413
		414	dk = spectrum->bs_alter_scale + 1;
		415	sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
		416	if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
		417	return -1;
		418
		419	for (k = 1; k <= sbr->n_master; k++)
		420	sbr->f_master[k] = dk;
		421
		422	k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
		423	if (k2diff < 0) {
		424	sbr->f_master[1]--;
		425	sbr->f_master[2]-= (k2diff < -1);
		426	} else if (k2diff) {
		427	sbr->f_master[sbr->n_master]++;
		428	}
		429
		430	sbr->f_master[0] = sbr->k[0];
		431	for (k = 1; k <= sbr->n_master; k++)
		432	sbr->f_master[k] += sbr->f_master[k - 1];
		433
		434	} else {
		435	int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}
		436	int two_regions, num_bands_0;
		437	int vdk0_max, vdk1_min;
		438	int16_t vk0[49];
		439
		440	if (49 * sbr->k[2] > 110 * sbr->k[0]) {
		441	two_regions = 1;
		442	sbr->k[1] = 2 * sbr->k[0];
		443	} else {
		444	two_regions = 0;
		445	sbr->k[1] = sbr->k[2];
		446	}
		447
		448	num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
		449
		450	if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
		451	av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
		452	return -1;
		453	}
		454
		455	vk0[0] = 0;
		456
		457	make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
		458
		459	qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
		460	vdk0_max = vk0[num_bands_0];
		461
		462	vk0[0] = sbr->k[0];
		463	for (k = 1; k <= num_bands_0; k++) {
		464	if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
		465	av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
		466	return -1;
		467	}
		468	vk0[k] += vk0[k-1];
		469	}
		470
		471	if (two_regions) {
		472	int16_t vk1[49];
		473	float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
		474	: 1.0f; // bs_alter_scale = {0,1}
		475	int num_bands_1 = lrintf(half_bands * invwarp *
		476	log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
		477
		478	make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
		479
		480	vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
		481
		482	if (vdk1_min < vdk0_max) {
		483	int change;
		484	qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
		485	change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
		486	vk1[1] += change;
		487	vk1[num_bands_1] -= change;
		488	}
		489
		490	qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
		491
		492	vk1[0] = sbr->k[1];
		493	for (k = 1; k <= num_bands_1; k++) {
		494	if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
		495	av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
		496	return -1;
		497	}
		498	vk1[k] += vk1[k-1];
		499	}
		500
		501	sbr->n_master = num_bands_0 + num_bands_1;
		502	if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
		503	return -1;
		504	memcpy(&sbr->f_master[0], vk0,
		505	(num_bands_0 + 1) * sizeof(sbr->f_master[0]));
		506	memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
		507	num_bands_1 * sizeof(sbr->f_master[0]));
		508
		509	} else {
		510	sbr->n_master = num_bands_0;
		511	if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
		512	return -1;
		513	memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
		514	}
		515	}
		516
		517	return 0;
		518	}
		519
		520	/// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
		521	static int sbr_hf_calc_npatches(AACContext ac, SpectralBandReplication sbr)
		522	{
		523	int i, k, sb = 0;
		524	int msb = sbr->k[0];
		525	int usb = sbr->kx[1];
		526	int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
		527
		528	sbr->num_patches = 0;
		529
		530	if (goal_sb < sbr->kx[1] + sbr->m[1]) {
		531	for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
		532	} else
		533	k = sbr->n_master;
		534
		535	do {
		536	int odd = 0;
		537	for (i = k; i == k \|\| sb > (sbr->k[0] - 1 + msb - odd); i--) {
		538	sb = sbr->f_master[i];
		539	odd = (sb + sbr->k[0]) & 1;
		540	}
		541
		542	// Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
		543	// After this check the final number of patches can still be six which is
		544	// illegal however the Coding Technologies decoder check stream has a final
		545	// count of 6 patches
		546	if (sbr->num_patches > 5) {
		547	av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
		548	return -1;
		549	}
		550
		551	sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
		552	sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
		553
		554	if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
		555	usb = sb;
		556	msb = sb;
		557	sbr->num_patches++;
		558	} else
		559	msb = sbr->kx[1];
		560
		561	if (sbr->f_master[k] - sb < 3)
		562	k = sbr->n_master;
		563	} while (sb != sbr->kx[1] + sbr->m[1]);
		564
		565	if (sbr->num_patches > 1 && sbr->patch_num_subbands[sbr->num_patches-1] < 3)
		566	sbr->num_patches--;
		567
		568	return 0;
		569	}
		570
		571	/// Derived Frequency Band Tables (14496-3 sp04 p197)
		572	static int sbr_make_f_derived(AACContext ac, SpectralBandReplication sbr)
		573	{
		574	int k, temp;
		575
		576	sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
		577	sbr->n[0] = (sbr->n[1] + 1) >> 1;
		578
		579	memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
		580	(sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
		581	sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
		582	sbr->kx[1] = sbr->f_tablehigh[0];
		583
		584	// Requirements (14496-3 sp04 p205)
		585	if (sbr->kx[1] + sbr->m[1] > 64) {
		586	av_log(ac->avctx, AV_LOG_ERROR,
		587	"Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
		588	return -1;
		589	}
		590	if (sbr->kx[1] > 32) {
		591	av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
		592	return -1;
		593	}
		594
		595	sbr->f_tablelow[0] = sbr->f_tablehigh[0];
		596	temp = sbr->n[1] & 1;
		597	for (k = 1; k <= sbr->n[0]; k++)
		598	sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
		599
		600	sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
		601	log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
		602	if (sbr->n_q > 5) {
		603	av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
		604	return -1;
		605	}
		606
		607	sbr->f_tablenoise[0] = sbr->f_tablelow[0];
		608	temp = 0;
		609	for (k = 1; k <= sbr->n_q; k++) {
		610	temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
		611	sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
		612	}
		613
		614	if (sbr_hf_calc_npatches(ac, sbr) < 0)
		615	return -1;
		616
		617	sbr_make_f_tablelim(sbr);
		618
		619	sbr->data[0].f_indexnoise = 0;
		620	sbr->data[1].f_indexnoise = 0;
		621
		622	return 0;
		623	}
		624
		625	static av_always_inline void get_bits1_vector(GetBitContext gb, uint8_t vec,
		626	int elements)
		627	{
		628	int i;
		629	for (i = 0; i < elements; i++) {
		630	vec[i] = get_bits1(gb);
		631	}
		632	}
		633
		634	/** ceil(log2(index+1)) */
		635	static const int8_t ceil_log2[] = {
		636	0, 1, 2, 2, 3, 3,
		637	};
		638
		639	static int read_sbr_grid(AACContext ac, SpectralBandReplication sbr,
		640	GetBitContext gb, SBRData ch_data)
		641	{
		642	int i;
		643	unsigned bs_pointer = 0;
		644	// frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
		645	int abs_bord_trail = 16;
		646	int num_rel_lead, num_rel_trail;
		647	unsigned bs_num_env_old = ch_data->bs_num_env;
		648
		649	ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
		650	ch_data->bs_amp_res = sbr->bs_amp_res_header;
		651	ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];
		652
		653	switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
		654	case FIXFIX:
		655	ch_data->bs_num_env = 1 << get_bits(gb, 2);
		656	num_rel_lead = ch_data->bs_num_env - 1;
		657	if (ch_data->bs_num_env == 1)
		658	ch_data->bs_amp_res = 0;
		659
		660	if (ch_data->bs_num_env > 4) {
		661	av_log(ac->avctx, AV_LOG_ERROR,
		662	"Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
		663	ch_data->bs_num_env);
		664	return -1;
		665	}
		666
		667	ch_data->t_env[0] = 0;
		668	ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
		669
		670	abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
		671	ch_data->bs_num_env;
		672	for (i = 0; i < num_rel_lead; i++)
		673	ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
		674
		675	ch_data->bs_freq_res[1] = get_bits1(gb);
		676	for (i = 1; i < ch_data->bs_num_env; i++)
		677	ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
		678	break;
		679	case FIXVAR:
		680	abs_bord_trail += get_bits(gb, 2);
		681	num_rel_trail = get_bits(gb, 2);
		682	ch_data->bs_num_env = num_rel_trail + 1;
		683	ch_data->t_env[0] = 0;
		684	ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
		685
		686	for (i = 0; i < num_rel_trail; i++)
		687	ch_data->t_env[ch_data->bs_num_env - 1 - i] =
		688	ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
		689
		690	bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
		691
		692	for (i = 0; i < ch_data->bs_num_env; i++)
		693	ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
		694	break;
		695	case VARFIX:
		696	ch_data->t_env[0] = get_bits(gb, 2);
		697	num_rel_lead = get_bits(gb, 2);
		698	ch_data->bs_num_env = num_rel_lead + 1;
		699	ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
		700
		701	for (i = 0; i < num_rel_lead; i++)
		702	ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
		703
		704	bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
		705
		706	get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
		707	break;
		708	case VARVAR:
		709	ch_data->t_env[0] = get_bits(gb, 2);
		710	abs_bord_trail += get_bits(gb, 2);
		711	num_rel_lead = get_bits(gb, 2);
		712	num_rel_trail = get_bits(gb, 2);
		713	ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
		714
		715	if (ch_data->bs_num_env > 5) {
		716	av_log(ac->avctx, AV_LOG_ERROR,
		717	"Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
		718	ch_data->bs_num_env);
		719	return -1;
		720	}
		721
		722	ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
		723
		724	for (i = 0; i < num_rel_lead; i++)
		725	ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
		726	for (i = 0; i < num_rel_trail; i++)
		727	ch_data->t_env[ch_data->bs_num_env - 1 - i] =
		728	ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
		729
		730	bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
		731
		732	get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
		733	break;
		734	}
		735
		736	if (bs_pointer > ch_data->bs_num_env + 1) {
		737	av_log(ac->avctx, AV_LOG_ERROR,
		738	"Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
		739	bs_pointer);
		740	return -1;
		741	}
		742
		743	for (i = 1; i <= ch_data->bs_num_env; i++) {
		744	if (ch_data->t_env[i-1] > ch_data->t_env[i]) {
		745	av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");
		746	return -1;
		747	}
		748	}
		749
		750	ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
		751
		752	ch_data->t_q[0] = ch_data->t_env[0];
		753	ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
		754	if (ch_data->bs_num_noise > 1) {
		755	unsigned int idx;
		756	if (ch_data->bs_frame_class == FIXFIX) {
		757	idx = ch_data->bs_num_env >> 1;
		758	} else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
		759	idx = ch_data->bs_num_env - FFMAX((int)bs_pointer - 1, 1);
		760	} else { // VARFIX
		761	if (!bs_pointer)
		762	idx = 1;
		763	else if (bs_pointer == 1)
		764	idx = ch_data->bs_num_env - 1;
		765	else // bs_pointer > 1
		766	idx = bs_pointer - 1;
		767	}
		768	ch_data->t_q[1] = ch_data->t_env[idx];
		769	}
		770
		771	ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev
		772	ch_data->e_a[1] = -1;
		773	if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
		774	ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;
		775	} else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
		776	ch_data->e_a[1] = bs_pointer - 1;
		777
		778	return 0;
		779	}
		780
		781	static void copy_sbr_grid(SBRData dst, const SBRData src) {
		782	//These variables are saved from the previous frame rather than copied
		783	dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
		784	dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
		785	dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
		786
		787	//These variables are read from the bitstream and therefore copied
		788	memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
		789	memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
		790	memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
		791	dst->bs_num_env = src->bs_num_env;
		792	dst->bs_amp_res = src->bs_amp_res;
		793	dst->bs_num_noise = src->bs_num_noise;
		794	dst->bs_frame_class = src->bs_frame_class;
		795	dst->e_a[1] = src->e_a[1];
		796	}
		797
		798	/// Read how the envelope and noise floor data is delta coded
		799	static void read_sbr_dtdf(SpectralBandReplication sbr, GetBitContext gb,
		800	SBRData *ch_data)
		801	{
		802	get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env);
		803	get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
		804	}
		805
		806	/// Read inverse filtering data
		807	static void read_sbr_invf(SpectralBandReplication sbr, GetBitContext gb,
		808	SBRData *ch_data)
		809	{
		810	int i;
		811
		812	memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
		813	for (i = 0; i < sbr->n_q; i++)
		814	ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
		815	}
		816
		817	static void read_sbr_envelope(SpectralBandReplication sbr, GetBitContext gb,
		818	SBRData *ch_data, int ch)
		819	{
		820	int bits;
		821	int i, j, k;
		822	VLC_TYPE (t_huff)[2], (f_huff)[2];
		823	int t_lav, f_lav;
		824	const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
		825	const int odd = sbr->n[1] & 1;
		826
		827	if (sbr->bs_coupling && ch) {
		828	if (ch_data->bs_amp_res) {
		829	bits = 5;
		830	t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
		831	t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
		832	f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
		833	f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
		834	} else {
		835	bits = 6;
		836	t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
		837	t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
		838	f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
		839	f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
		840	}
		841	} else {
		842	if (ch_data->bs_amp_res) {
		843	bits = 6;
		844	t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
		845	t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
		846	f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
		847	f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
		848	} else {
		849	bits = 7;
		850	t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
		851	t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
		852	f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
		853	f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
		854	}
		855	}
		856
		857	for (i = 0; i < ch_data->bs_num_env; i++) {
		858	if (ch_data->bs_df_env[i]) {
		859	// bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
		860	if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
		861	for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
		862	ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
		863	} else if (ch_data->bs_freq_res[i + 1]) {
		864	for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
		865	k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
		866	ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
		867	}
		868	} else {
		869	for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
		870	k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
		871	ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
		872	}
		873	}
		874	} else {
		875	ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
		876	for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
		877	ch_data->env_facs[i + 1][j] = ch_data->env_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
		878	}
		879	}
		880
		881	//assign 0th elements of env_facs from last elements
		882	memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],
		883	sizeof(ch_data->env_facs[0]));
		884	}
		885
		886	static void read_sbr_noise(SpectralBandReplication sbr, GetBitContext gb,
		887	SBRData *ch_data, int ch)
		888	{
		889	int i, j;
		890	VLC_TYPE (t_huff)[2], (f_huff)[2];
		891	int t_lav, f_lav;
		892	int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
		893
		894	if (sbr->bs_coupling && ch) {
		895	t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
		896	t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
		897	f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
		898	f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
		899	} else {
		900	t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
		901	t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
		902	f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
		903	f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
		904	}
		905
		906	for (i = 0; i < ch_data->bs_num_noise; i++) {
		907	if (ch_data->bs_df_noise[i]) {
		908	for (j = 0; j < sbr->n_q; j++)
		909	ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
		910	} else {
		911	ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
		912	for (j = 1; j < sbr->n_q; j++)
		913	ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
		914	}
		915	}
		916
		917	//assign 0th elements of noise_facs from last elements
		918	memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
		919	sizeof(ch_data->noise_facs[0]));
		920	}
		921
		922	static void read_sbr_extension(AACContext ac, SpectralBandReplication sbr,
		923	GetBitContext *gb,
		924	int bs_extension_id, int *num_bits_left)
		925	{
		926	switch (bs_extension_id) {
		927	case EXTENSION_ID_PS:
		928	if (!ac->oc[1].m4ac.ps) {
		929	av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
		930	skip_bits_long(gb, *num_bits_left); // bs_fill_bits
		931	*num_bits_left = 0;
		932	} else {
		933	#if 1
		934	num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, num_bits_left);
		935	#else
		936	avpriv_report_missing_feature(ac->avctx, "Parametric Stereo");
		937	skip_bits_long(gb, *num_bits_left); // bs_fill_bits
		938	*num_bits_left = 0;
		939	#endif
		940	}
		941	break;
		942	default:
		943	// some files contain 0-padding
		944	if (bs_extension_id \|\| num_bits_left > 16 \|\| show_bits(gb, num_bits_left))
		945	avpriv_request_sample(ac->avctx, "Reserved SBR extensions");
		946	skip_bits_long(gb, *num_bits_left); // bs_fill_bits
		947	*num_bits_left = 0;
		948	break;
		949	}
		950	}
		951
		952	static int read_sbr_single_channel_element(AACContext *ac,
		953	SpectralBandReplication *sbr,
		954	GetBitContext *gb)
		955	{
		956	if (get_bits1(gb)) // bs_data_extra
		957	skip_bits(gb, 4); // bs_reserved
		958
		959	if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
		960	return -1;
		961	read_sbr_dtdf(sbr, gb, &sbr->data[0]);
		962	read_sbr_invf(sbr, gb, &sbr->data[0]);
		963	read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
		964	read_sbr_noise(sbr, gb, &sbr->data[0], 0);
		965
		966	if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
		967	get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
		968
		969	return 0;
		970	}
		971
		972	static int read_sbr_channel_pair_element(AACContext *ac,
		973	SpectralBandReplication *sbr,
		974	GetBitContext *gb)
		975	{
		976	if (get_bits1(gb)) // bs_data_extra
		977	skip_bits(gb, 8); // bs_reserved
		978
		979	if ((sbr->bs_coupling = get_bits1(gb))) {
		980	if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
		981	return -1;
		982	copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
		983	read_sbr_dtdf(sbr, gb, &sbr->data[0]);
		984	read_sbr_dtdf(sbr, gb, &sbr->data[1]);
		985	read_sbr_invf(sbr, gb, &sbr->data[0]);
		986	memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
		987	memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
		988	read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
		989	read_sbr_noise(sbr, gb, &sbr->data[0], 0);
		990	read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
		991	read_sbr_noise(sbr, gb, &sbr->data[1], 1);
		992	} else {
		993	if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) \|\|
		994	read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
		995	return -1;
		996	read_sbr_dtdf(sbr, gb, &sbr->data[0]);
		997	read_sbr_dtdf(sbr, gb, &sbr->data[1]);
		998	read_sbr_invf(sbr, gb, &sbr->data[0]);
		999	read_sbr_invf(sbr, gb, &sbr->data[1]);
		1000	read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
		1001	read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
		1002	read_sbr_noise(sbr, gb, &sbr->data[0], 0);
		1003	read_sbr_noise(sbr, gb, &sbr->data[1], 1);
		1004	}
		1005
		1006	if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
		1007	get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
		1008	if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
		1009	get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
		1010
		1011	return 0;
		1012	}
		1013
		1014	static unsigned int read_sbr_data(AACContext ac, SpectralBandReplication sbr,
		1015	GetBitContext *gb, int id_aac)
		1016	{
		1017	unsigned int cnt = get_bits_count(gb);
		1018
		1019	if (id_aac == TYPE_SCE \|\| id_aac == TYPE_CCE) {
		1020	if (read_sbr_single_channel_element(ac, sbr, gb)) {
		1021	sbr_turnoff(sbr);
		1022	return get_bits_count(gb) - cnt;
		1023	}
		1024	} else if (id_aac == TYPE_CPE) {
		1025	if (read_sbr_channel_pair_element(ac, sbr, gb)) {
		1026	sbr_turnoff(sbr);
		1027	return get_bits_count(gb) - cnt;
		1028	}
		1029	} else {
		1030	av_log(ac->avctx, AV_LOG_ERROR,
		1031	"Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
		1032	sbr_turnoff(sbr);
		1033	return get_bits_count(gb) - cnt;
		1034	}
		1035	if (get_bits1(gb)) { // bs_extended_data
		1036	int num_bits_left = get_bits(gb, 4); // bs_extension_size
		1037	if (num_bits_left == 15)
		1038	num_bits_left += get_bits(gb, 8); // bs_esc_count
		1039
		1040	num_bits_left <<= 3;
		1041	while (num_bits_left > 7) {
		1042	num_bits_left -= 2;
		1043	read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
		1044	}
		1045	if (num_bits_left < 0) {
		1046	av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
		1047	}
		1048	if (num_bits_left > 0)
		1049	skip_bits(gb, num_bits_left);
		1050	}
		1051
		1052	return get_bits_count(gb) - cnt;
		1053	}
		1054
		1055	static void sbr_reset(AACContext ac, SpectralBandReplication sbr)
		1056	{
		1057	int err;
		1058	err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
		1059	if (err >= 0)
		1060	err = sbr_make_f_derived(ac, sbr);
		1061	if (err < 0) {
		1062	av_log(ac->avctx, AV_LOG_ERROR,
		1063	"SBR reset failed. Switching SBR to pure upsampling mode.\n");
		1064	sbr_turnoff(sbr);
		1065	}
		1066	}
		1067
		1068	/**
		1069	* Decode Spectral Band Replication extension data; reference: table 4.55.
		1070	*
		1071	* @param crc flag indicating the presence of CRC checksum
		1072	* @param cnt length of TYPE_FIL syntactic element in bytes
		1073	*
		1074	* @return Returns number of bytes consumed from the TYPE_FIL element.
		1075	*/
		1076	int ff_decode_sbr_extension(AACContext ac, SpectralBandReplication sbr,
		1077	GetBitContext *gb_host, int crc, int cnt, int id_aac)
		1078	{
		1079	unsigned int num_sbr_bits = 0, num_align_bits;
		1080	unsigned bytes_read;
		1081	GetBitContext gbc = gb_host, gb = &gbc;
		1082	skip_bits_long(gb_host, cnt*8 - 4);
		1083
		1084	sbr->reset = 0;
		1085
		1086	if (!sbr->sample_rate)
		1087	sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
		1088	if (!ac->oc[1].m4ac.ext_sample_rate)
		1089	ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate;
		1090
		1091	if (crc) {
		1092	skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
		1093	num_sbr_bits += 10;
		1094	}
		1095
		1096	//Save some state from the previous frame.
		1097	sbr->kx[0] = sbr->kx[1];
		1098	sbr->m[0] = sbr->m[1];
		1099	sbr->kx_and_m_pushed = 1;
		1100
		1101	num_sbr_bits++;
		1102	if (get_bits1(gb)) // bs_header_flag
		1103	num_sbr_bits += read_sbr_header(sbr, gb);
		1104
		1105	if (sbr->reset)
		1106	sbr_reset(ac, sbr);
		1107
		1108	if (sbr->start)
		1109	num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);
		1110
		1111	num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
		1112	bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
		1113
		1114	if (bytes_read > cnt) {
		1115	av_log(ac->avctx, AV_LOG_ERROR,
		1116	"Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
		1117	}
		1118	return cnt;
		1119	}
		1120
		1121	/// Dequantization and stereo decoding (14496-3 sp04 p203)
		1122	static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
		1123	{
		1124	int k, e;
		1125	int ch;
		1126
		1127	if (id_aac == TYPE_CPE && sbr->bs_coupling) {
		1128	float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f;
		1129	float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
		1130	for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
		1131	for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
		1132	float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
		1133	float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
		1134	float fac;
		1135	if (temp1 > 1E20) {
		1136	av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
		1137	temp1 = 1;
		1138	}
		1139	fac = temp1 / (1.0f + temp2);
		1140	sbr->data[0].env_facs[e][k] = fac;
		1141	sbr->data[1].env_facs[e][k] = fac * temp2;
		1142	}
		1143	}
		1144	for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
		1145	for (k = 0; k < sbr->n_q; k++) {
		1146	float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
		1147	float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
		1148	float fac;
		1149	if (temp1 > 1E20) {
		1150	av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
		1151	temp1 = 1;
		1152	}
		1153	fac = temp1 / (1.0f + temp2);
		1154	sbr->data[0].noise_facs[e][k] = fac;
		1155	sbr->data[1].noise_facs[e][k] = fac * temp2;
		1156	}
		1157	}
		1158	} else { // SCE or one non-coupled CPE
		1159	for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
		1160	float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
		1161	for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
		1162	for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++){
		1163	sbr->data[ch].env_facs[e][k] =
		1164	exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
		1165	if (sbr->data[ch].env_facs[e][k] > 1E20) {
		1166	av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
		1167	sbr->data[ch].env_facs[e][k] = 1;
		1168	}
		1169	}
		1170
		1171	for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
		1172	for (k = 0; k < sbr->n_q; k++)
		1173	sbr->data[ch].noise_facs[e][k] =
		1174	exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
		1175	}
		1176	}
		1177	}
		1178
		1179	/**
		1180	* Analysis QMF Bank (14496-3 sp04 p206)
		1181	*
		1182	* @param x pointer to the beginning of the first sample window
		1183	* @param W array of complex-valued samples split into subbands
		1184	*/
		1185	#ifndef sbr_qmf_analysis
		1186	static void sbr_qmf_analysis(AVFloatDSPContext dsp, FFTContext mdct,
		1187	SBRDSPContext sbrdsp, const float in, float *x,
		1188	float z[320], float W[2][32][32][2], int buf_idx)
		1189	{
		1190	int i;
		1191	memcpy(x , x+1024, (320-32)*sizeof(x[0]));
		1192	memcpy(x+288, in, 1024*sizeof(x[0]));
		1193	for (i = 0; i < 32; i++) { // numTimeSlotsRATE = 162 as 960 sample frames
		1194	// are not supported
		1195	dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
		1196	sbrdsp->sum64x5(z);
		1197	sbrdsp->qmf_pre_shuffle(z);
		1198	mdct->imdct_half(mdct, z, z+64);
		1199	sbrdsp->qmf_post_shuffle(W[buf_idx][i], z);
		1200	x += 32;
		1201	}
		1202	}
		1203	#endif
		1204
		1205	/**
		1206	* Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
		1207	* (14496-3 sp04 p206)
		1208	*/
		1209	#ifndef sbr_qmf_synthesis
		1210	static void sbr_qmf_synthesis(FFTContext *mdct,
		1211	SBRDSPContext sbrdsp, AVFloatDSPContext dsp,
		1212	float *out, float X[2][38][64],
		1213	float mdct_buf[2][64],
		1214	float v0, int v_off, const unsigned int div)
		1215	{
		1216	int i, n;
		1217	const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
		1218	const int step = 128 >> div;
		1219	float *v;
		1220	for (i = 0; i < 32; i++) {
		1221	if (*v_off < step) {
		1222	int saved_samples = (1280 - 128) >> div;
		1223	memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
		1224	*v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;
		1225	} else {
		1226	*v_off -= step;
		1227	}
		1228	v = v0 + *v_off;
		1229	if (div) {
		1230	for (n = 0; n < 32; n++) {
		1231	X[0][i][ n] = -X[0][i][n];
		1232	X[0][i][32+n] = X[1][i][31-n];
		1233	}
		1234	mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
		1235	sbrdsp->qmf_deint_neg(v, mdct_buf[0]);
		1236	} else {
		1237	sbrdsp->neg_odd_64(X[1][i]);
		1238	mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
		1239	mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);
		1240	sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);
		1241	}
		1242	dsp->vector_fmul (out, v , sbr_qmf_window , 64 >> div);
		1243	dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);
		1244	dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);
		1245	dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);
		1246	dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);
		1247	dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);
		1248	dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);
		1249	dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);
		1250	dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);
		1251	dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);
		1252	out += 64 >> div;
		1253	}
		1254	}
		1255	#endif
		1256
		1257	/** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
		1258	* (14496-3 sp04 p214)
		1259	* Warning: This routine does not seem numerically stable.
		1260	*/
		1261	static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
		1262	float (alpha0)[2], float (alpha1)[2],
		1263	const float X_low[32][40][2], int k0)
		1264	{
		1265	int k;
		1266	for (k = 0; k < k0; k++) {
		1267	LOCAL_ALIGNED_16(float, phi, [3], [2][2]);
		1268	float dk;
		1269
		1270	dsp->autocorrelate(X_low[k], phi);
		1271
		1272	dk = phi[2][1][0] * phi[1][0][0] -
		1273	(phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
		1274
		1275	if (!dk) {
		1276	alpha1[k][0] = 0;
		1277	alpha1[k][1] = 0;
		1278	} else {
		1279	float temp_real, temp_im;
		1280	temp_real = phi[0][0][0] * phi[1][1][0] -
		1281	phi[0][0][1] * phi[1][1][1] -
		1282	phi[0][1][0] * phi[1][0][0];
		1283	temp_im = phi[0][0][0] * phi[1][1][1] +
		1284	phi[0][0][1] * phi[1][1][0] -
		1285	phi[0][1][1] * phi[1][0][0];
		1286
		1287	alpha1[k][0] = temp_real / dk;
		1288	alpha1[k][1] = temp_im / dk;
		1289	}
		1290
		1291	if (!phi[1][0][0]) {
		1292	alpha0[k][0] = 0;
		1293	alpha0[k][1] = 0;
		1294	} else {
		1295	float temp_real, temp_im;
		1296	temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
		1297	alpha1[k][1] * phi[1][1][1];
		1298	temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
		1299	alpha1[k][0] * phi[1][1][1];
		1300
		1301	alpha0[k][0] = -temp_real / phi[1][0][0];
		1302	alpha0[k][1] = -temp_im / phi[1][0][0];
		1303	}
		1304
		1305	if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f \|\|
		1306	alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
		1307	alpha1[k][0] = 0;
		1308	alpha1[k][1] = 0;
		1309	alpha0[k][0] = 0;
		1310	alpha0[k][1] = 0;
		1311	}
		1312	}
		1313	}
		1314
		1315	/// Chirp Factors (14496-3 sp04 p214)
		1316	static void sbr_chirp(SpectralBandReplication sbr, SBRData ch_data)
		1317	{
		1318	int i;
		1319	float new_bw;
		1320	static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
		1321
		1322	for (i = 0; i < sbr->n_q; i++) {
		1323	if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
		1324	new_bw = 0.6f;
		1325	} else
		1326	new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
		1327
		1328	if (new_bw < ch_data->bw_array[i]) {
		1329	new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];
		1330	} else
		1331	new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
		1332	ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
		1333	}
		1334	}
		1335
		1336	/// Generate the subband filtered lowband
		1337	static int sbr_lf_gen(AACContext ac, SpectralBandReplication sbr,
		1338	float X_low[32][40][2], const float W[2][32][32][2],
		1339	int buf_idx)
		1340	{
		1341	int i, k;
		1342	const int t_HFGen = 8;
		1343	const int i_f = 32;
		1344	memset(X_low, 0, 32sizeof(X_low));
		1345	for (k = 0; k < sbr->kx[1]; k++) {
		1346	for (i = t_HFGen; i < i_f + t_HFGen; i++) {
		1347	X_low[k][i][0] = W[buf_idx][i - t_HFGen][k][0];
		1348	X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1];
		1349	}
		1350	}
		1351	buf_idx = 1-buf_idx;
		1352	for (k = 0; k < sbr->kx[0]; k++) {
		1353	for (i = 0; i < t_HFGen; i++) {
		1354	X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0];
		1355	X_low[k][i][1] = W[buf_idx][i + i_f - t_HFGen][k][1];
		1356	}
		1357	}
		1358	return 0;
		1359	}
		1360
		1361	/// High Frequency Generator (14496-3 sp04 p215)
		1362	static int sbr_hf_gen(AACContext ac, SpectralBandReplication sbr,
		1363	float X_high[64][40][2], const float X_low[32][40][2],
		1364	const float (alpha0)[2], const float (alpha1)[2],
		1365	const float bw_array[5], const uint8_t *t_env,
		1366	int bs_num_env)
		1367	{
		1368	int j, x;
		1369	int g = 0;
		1370	int k = sbr->kx[1];
		1371	for (j = 0; j < sbr->num_patches; j++) {
		1372	for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
		1373	const int p = sbr->patch_start_subband[j] + x;
		1374	while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
		1375	g++;
		1376	g--;
		1377
		1378	if (g < 0) {
		1379	av_log(ac->avctx, AV_LOG_ERROR,
		1380	"ERROR : no subband found for frequency %d\n", k);
		1381	return -1;
		1382	}
		1383
		1384	sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,
		1385	X_low[p] + ENVELOPE_ADJUSTMENT_OFFSET,
		1386	alpha0[p], alpha1[p], bw_array[g],
		1387	2 * t_env[0], 2 * t_env[bs_num_env]);
		1388	}
		1389	}
		1390	if (k < sbr->m[1] + sbr->kx[1])
		1391	memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
		1392
		1393	return 0;
		1394	}
		1395
		1396	/// Generate the subband filtered lowband
		1397	static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],
		1398	const float Y0[38][64][2], const float Y1[38][64][2],
		1399	const float X_low[32][40][2], int ch)
		1400	{
		1401	int k, i;
		1402	const int i_f = 32;
		1403	const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
		1404	memset(X, 0, 2sizeof(X));
		1405	for (k = 0; k < sbr->kx[0]; k++) {
		1406	for (i = 0; i < i_Temp; i++) {
		1407	X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
		1408	X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
		1409	}
		1410	}
		1411	for (; k < sbr->kx[0] + sbr->m[0]; k++) {
		1412	for (i = 0; i < i_Temp; i++) {
		1413	X[0][i][k] = Y0[i + i_f][k][0];
		1414	X[1][i][k] = Y0[i + i_f][k][1];
		1415	}
		1416	}
		1417
		1418	for (k = 0; k < sbr->kx[1]; k++) {
		1419	for (i = i_Temp; i < 38; i++) {
		1420	X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
		1421	X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
		1422	}
		1423	}
		1424	for (; k < sbr->kx[1] + sbr->m[1]; k++) {
		1425	for (i = i_Temp; i < i_f; i++) {
		1426	X[0][i][k] = Y1[i][k][0];
		1427	X[1][i][k] = Y1[i][k][1];
		1428	}
		1429	}
		1430	return 0;
		1431	}
		1432
		1433	/** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
		1434	* (14496-3 sp04 p217)
		1435	*/
		1436	static int sbr_mapping(AACContext ac, SpectralBandReplication sbr,
		1437	SBRData *ch_data, int e_a[2])
		1438	{
		1439	int e, i, m;
		1440
		1441	memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
		1442	for (e = 0; e < ch_data->bs_num_env; e++) {
		1443	const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
		1444	uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
		1445	int k;
		1446
		1447	if (sbr->kx[1] != table[0]) {
		1448	av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "
		1449	"Derived frequency tables were not regenerated.\n");
		1450	sbr_turnoff(sbr);
		1451	return AVERROR_BUG;
		1452	}
		1453	for (i = 0; i < ilim; i++)
		1454	for (m = table[i]; m < table[i + 1]; m++)
		1455	sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
		1456
		1457	// ch_data->bs_num_noise > 1 => 2 noise floors
		1458	k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
		1459	for (i = 0; i < sbr->n_q; i++)
		1460	for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
		1461	sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
		1462
		1463	for (i = 0; i < sbr->n[1]; i++) {
		1464	if (ch_data->bs_add_harmonic_flag) {
		1465	const unsigned int m_midpoint =
		1466	(sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
		1467
		1468	ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
		1469	(e >= e_a[1] \|\| (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
		1470	}
		1471	}
		1472
		1473	for (i = 0; i < ilim; i++) {
		1474	int additional_sinusoid_present = 0;
		1475	for (m = table[i]; m < table[i + 1]; m++) {
		1476	if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
		1477	additional_sinusoid_present = 1;
		1478	break;
		1479	}
		1480	}
		1481	memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
		1482	(table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
		1483	}
		1484	}
		1485
		1486	memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
		1487	return 0;
		1488	}
		1489
		1490	/// Estimation of current envelope (14496-3 sp04 p218)
		1491	static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
		1492	SpectralBandReplication sbr, SBRData ch_data)
		1493	{
		1494	int e, m;
		1495	int kx1 = sbr->kx[1];
		1496
		1497	if (sbr->bs_interpol_freq) {
		1498	for (e = 0; e < ch_data->bs_num_env; e++) {
		1499	const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
		1500	int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
		1501	int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
		1502
		1503	for (m = 0; m < sbr->m[1]; m++) {
		1504	float sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);
		1505	e_curr[e][m] = sum * recip_env_size;
		1506	}
		1507	}
		1508	} else {
		1509	int k, p;
		1510
		1511	for (e = 0; e < ch_data->bs_num_env; e++) {
		1512	const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
		1513	int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
		1514	int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
		1515	const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
		1516
		1517	for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
		1518	float sum = 0.0f;
		1519	const int den = env_size * (table[p + 1] - table[p]);
		1520
		1521	for (k = table[p]; k < table[p + 1]; k++) {
		1522	sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);
		1523	}
		1524	sum /= den;
		1525	for (k = table[p]; k < table[p + 1]; k++) {
		1526	e_curr[e][k - kx1] = sum;
		1527	}
		1528	}
		1529	}
		1530	}
		1531	}
		1532
		1533	/**
		1534	* Calculation of levels of additional HF signal components (14496-3 sp04 p219)
		1535	* and Calculation of gain (14496-3 sp04 p219)
		1536	*/
		1537	static void sbr_gain_calc(AACContext ac, SpectralBandReplication sbr,
		1538	SBRData *ch_data, const int e_a[2])
		1539	{
		1540	int e, k, m;
		1541	// max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
		1542	static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
		1543
		1544	for (e = 0; e < ch_data->bs_num_env; e++) {
		1545	int delta = !((e == e_a[1]) \|\| (e == e_a[0]));
		1546	for (k = 0; k < sbr->n_lim; k++) {
		1547	float gain_boost, gain_max;
		1548	float sum[2] = { 0.0f, 0.0f };
		1549	for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
		1550	const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
		1551	sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
		1552	sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
		1553	if (!sbr->s_mapped[e][m]) {
		1554	sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
		1555	((1.0f + sbr->e_curr[e][m]) *
		1556	(1.0f + sbr->q_mapped[e][m] * delta)));
		1557	} else {
		1558	sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
		1559	((1.0f + sbr->e_curr[e][m]) *
		1560	(1.0f + sbr->q_mapped[e][m])));
		1561	}
		1562	}
		1563	for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
		1564	sum[0] += sbr->e_origmapped[e][m];
		1565	sum[1] += sbr->e_curr[e][m];
		1566	}
		1567	gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
		1568	gain_max = FFMIN(100000.f, gain_max);
		1569	for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
		1570	float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
		1571	sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);
		1572	sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
		1573	}
		1574	sum[0] = sum[1] = 0.0f;
		1575	for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
		1576	sum[0] += sbr->e_origmapped[e][m];
		1577	sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
		1578	+ sbr->s_m[e][m] * sbr->s_m[e][m]
		1579	+ (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
		1580	}
		1581	gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
		1582	gain_boost = FFMIN(1.584893192f, gain_boost);
		1583	for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
		1584	sbr->gain[e][m] *= gain_boost;
		1585	sbr->q_m[e][m] *= gain_boost;
		1586	sbr->s_m[e][m] *= gain_boost;
		1587	}
		1588	}
		1589	}
		1590	}
		1591
		1592	/// Assembling HF Signals (14496-3 sp04 p220)
		1593	static void sbr_hf_assemble(float Y1[38][64][2],
		1594	const float X_high[64][40][2],
		1595	SpectralBandReplication sbr, SBRData ch_data,
		1596	const int e_a[2])
		1597	{
		1598	int e, i, j, m;
		1599	const int h_SL = 4 * !sbr->bs_smoothing_mode;
		1600	const int kx = sbr->kx[1];
		1601	const int m_max = sbr->m[1];
		1602	static const float h_smooth[5] = {
		1603	0.33333333333333,
		1604	0.30150283239582,
		1605	0.21816949906249,
		1606	0.11516383427084,
		1607	0.03183050093751,
		1608	};
		1609	float (g_temp)[48] = ch_data->g_temp, (q_temp)[48] = ch_data->q_temp;
		1610	int indexnoise = ch_data->f_indexnoise;
		1611	int indexsine = ch_data->f_indexsine;
		1612
		1613	if (sbr->reset) {
		1614	for (i = 0; i < h_SL; i++) {
		1615	memcpy(g_temp[i + 2ch_data->t_env[0]], sbr->gain[0], m_max sizeof(sbr->gain[0][0]));
		1616	memcpy(q_temp[i + 2ch_data->t_env[0]], sbr->q_m[0], m_max sizeof(sbr->q_m[0][0]));
		1617	}
		1618	} else if (h_SL) {
		1619	memcpy(g_temp[2ch_data->t_env[0]], g_temp[2ch_data->t_env_num_env_old], 4*sizeof(g_temp[0]));
		1620	memcpy(q_temp[2ch_data->t_env[0]], q_temp[2ch_data->t_env_num_env_old], 4*sizeof(q_temp[0]));
		1621	}
		1622
		1623	for (e = 0; e < ch_data->bs_num_env; e++) {
		1624	for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
		1625	memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
		1626	memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
		1627	}
		1628	}
		1629
		1630	for (e = 0; e < ch_data->bs_num_env; e++) {
		1631	for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
		1632	LOCAL_ALIGNED_16(float, g_filt_tab, [48]);
		1633	LOCAL_ALIGNED_16(float, q_filt_tab, [48]);
		1634	float g_filt, q_filt;
		1635
		1636	if (h_SL && e != e_a[0] && e != e_a[1]) {
		1637	g_filt = g_filt_tab;
		1638	q_filt = q_filt_tab;
		1639	for (m = 0; m < m_max; m++) {
		1640	const int idx1 = i + h_SL;
		1641	g_filt[m] = 0.0f;
		1642	q_filt[m] = 0.0f;
		1643	for (j = 0; j <= h_SL; j++) {
		1644	g_filt[m] += g_temp[idx1 - j][m] * h_smooth[j];
		1645	q_filt[m] += q_temp[idx1 - j][m] * h_smooth[j];
		1646	}
		1647	}
		1648	} else {
		1649	g_filt = g_temp[i + h_SL];
		1650	q_filt = q_temp[i];
		1651	}
		1652
		1653	sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max,
		1654	i + ENVELOPE_ADJUSTMENT_OFFSET);
		1655
		1656	if (e != e_a[0] && e != e_a[1]) {
		1657	sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e],
		1658	q_filt, indexnoise,
		1659	kx, m_max);
		1660	} else {
		1661	int idx = indexsine&1;
		1662	int A = (1-((indexsine+(kx & 1))&2));
		1663	int B = (A^(-idx)) + idx;
		1664	float *out = &Y1[i][kx][idx];
		1665	float *in = sbr->s_m[e];
		1666	for (m = 0; m+1 < m_max; m+=2) {
		1667	out[2m ] += in[m ] A;
		1668	out[2m+2] += in[m+1] B;
		1669	}
		1670	if(m_max&1)
		1671	out[2m ] += in[m ] A;
		1672	}
		1673	indexnoise = (indexnoise + m_max) & 0x1ff;
		1674	indexsine = (indexsine + 1) & 3;
		1675	}
		1676	}
		1677	ch_data->f_indexnoise = indexnoise;
		1678	ch_data->f_indexsine = indexsine;
		1679	}
		1680
		1681	void ff_sbr_apply(AACContext ac, SpectralBandReplication sbr, int id_aac,
		1682	float* L, float* R)
		1683	{
		1684	int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate;
		1685	int ch;
		1686	int nch = (id_aac == TYPE_CPE) ? 2 : 1;
		1687	int err;
		1688
		1689	if (!sbr->kx_and_m_pushed) {
		1690	sbr->kx[0] = sbr->kx[1];
		1691	sbr->m[0] = sbr->m[1];
		1692	} else {
		1693	sbr->kx_and_m_pushed = 0;
		1694	}
		1695
		1696	if (sbr->start) {
		1697	sbr_dequant(sbr, id_aac);
		1698	}
		1699	for (ch = 0; ch < nch; ch++) {
		1700	/* decode channel */
		1701	sbr_qmf_analysis(&ac->fdsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
		1702	(float*)sbr->qmf_filter_scratch,
		1703	sbr->data[ch].W, sbr->data[ch].Ypos);
		1704	sbr->c.sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W, sbr->data[ch].Ypos);
		1705	sbr->data[ch].Ypos ^= 1;
		1706	if (sbr->start) {
		1707	sbr->c.sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);
		1708	sbr_chirp(sbr, &sbr->data[ch]);
		1709	sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1,
		1710	sbr->data[ch].bw_array, sbr->data[ch].t_env,
		1711	sbr->data[ch].bs_num_env);
		1712
		1713	// hf_adj
		1714	err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
		1715	if (!err) {
		1716	sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
		1717	sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
		1718	sbr->c.sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],
		1719	sbr->X_high, sbr, &sbr->data[ch],
		1720	sbr->data[ch].e_a);
		1721	}
		1722	}
		1723
		1724	/* synthesis */
		1725	sbr->c.sbr_x_gen(sbr, sbr->X[ch],
		1726	sbr->data[ch].Y[1-sbr->data[ch].Ypos],
		1727	sbr->data[ch].Y[ sbr->data[ch].Ypos],
		1728	sbr->X_low, ch);
		1729	}
		1730
		1731	if (ac->oc[1].m4ac.ps == 1) {
		1732	if (sbr->ps.start) {
		1733	ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);
		1734	} else {
		1735	memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));
		1736	}
		1737	nch = 2;
		1738	}
		1739
		1740	sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, &ac->fdsp,
		1741	L, sbr->X[0], sbr->qmf_filter_scratch,
		1742	sbr->data[0].synthesis_filterbank_samples,
		1743	&sbr->data[0].synthesis_filterbank_samples_offset,
		1744	downsampled);
		1745	if (nch == 2)
		1746	sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, &ac->fdsp,
		1747	R, sbr->X[1], sbr->qmf_filter_scratch,
		1748	sbr->data[1].synthesis_filterbank_samples,
		1749	&sbr->data[1].synthesis_filterbank_samples_offset,
		1750	downsampled);
		1751	}
		1752
		1753	static void aacsbr_func_ptr_init(AACSBRContext *c)
		1754	{
		1755	c->sbr_lf_gen = sbr_lf_gen;
		1756	c->sbr_hf_assemble = sbr_hf_assemble;
		1757	c->sbr_x_gen = sbr_x_gen;
		1758	c->sbr_hf_inverse_filter = sbr_hf_inverse_filter;
		1759
		1760	if(ARCH_MIPS)
		1761	ff_aacsbr_func_ptr_init_mips(c);
		1762	}

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(root)/contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavcodec/aacsbr.c – Rev 6148