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author | Alex Converse <alex.converse@gmail.com> | 2010-03-08 04:33:02 +0000 |
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committer | Alex Converse <alex.converse@gmail.com> | 2010-03-08 04:33:02 +0000 |
commit | ed492b61dbe64ef8c25eb1e72ac7ca4e9df9bbd6 (patch) | |
tree | 7bfa8a074fdb1f4c21ddb4bd3cbd500413e2580c /libavcodec/aacsbr.c | |
parent | f19341e17a0ece29613cc583daaee6ec58aea9c5 (diff) | |
download | ffmpeg-ed492b61dbe64ef8c25eb1e72ac7ca4e9df9bbd6.tar.gz |
Add an HE-AAC v1 decoder.
A large portion of this code was orignally authored by Robert Swain. The rest
was written by me. Full history is available at:
svn://svn.ffmpeg.org/soc/aac-sbr
http://github.com/aconverse/ffmpeg-heaac/tree/sbr_pub
Originally committed as revision 22316 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/aacsbr.c')
-rw-r--r-- | libavcodec/aacsbr.c | 1759 |
1 files changed, 1759 insertions, 0 deletions
diff --git a/libavcodec/aacsbr.c b/libavcodec/aacsbr.c new file mode 100644 index 0000000000..e317a5c72f --- /dev/null +++ b/libavcodec/aacsbr.c @@ -0,0 +1,1759 @@ +/* + * AAC Spectral Band Replication decoding functions + * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl ) + * Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file libavcodec/aacsbr.c + * AAC Spectral Band Replication decoding functions + * @author Robert Swain ( rob opendot cl ) + */ + +#include "aac.h" +#include "sbr.h" +#include "aacsbr.h" +#include "aacsbrdata.h" + +#include <stdint.h> +#include <float.h> + +#define ENVELOPE_ADJUSTMENT_OFFSET 2 +#define NOISE_FLOOR_OFFSET 6.0f + +/** + * SBR VLC tables + */ +enum { + T_HUFFMAN_ENV_1_5DB, + F_HUFFMAN_ENV_1_5DB, + T_HUFFMAN_ENV_BAL_1_5DB, + F_HUFFMAN_ENV_BAL_1_5DB, + T_HUFFMAN_ENV_3_0DB, + F_HUFFMAN_ENV_3_0DB, + T_HUFFMAN_ENV_BAL_3_0DB, + F_HUFFMAN_ENV_BAL_3_0DB, + T_HUFFMAN_NOISE_3_0DB, + T_HUFFMAN_NOISE_BAL_3_0DB, +}; + +/** + * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98) + */ +enum { + FIXFIX, + FIXVAR, + VARFIX, + VARVAR, +}; + +enum { + EXTENSION_ID_PS = 2, +}; + +static VLC vlc_sbr[10]; +static const int8_t vlc_sbr_lav[10] = + { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 }; +static DECLARE_ALIGNED(16, float, analysis_cos_pre)[64]; +static DECLARE_ALIGNED(16, float, analysis_sin_pre)[64]; +static DECLARE_ALIGNED(16, float, analysis_cossin_post)[32][2]; +static const DECLARE_ALIGNED(16, float, zero64)[64]; + +#define SBR_INIT_VLC_STATIC(num, size) \ + INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \ + sbr_tmp[num].sbr_bits , 1, 1, \ + sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \ + size) + +#define SBR_VLC_ROW(name) \ + { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) } + +av_cold void ff_aac_sbr_init(void) +{ + int n, k; + static const struct { + const void *sbr_codes, *sbr_bits; + const unsigned int table_size, elem_size; + } sbr_tmp[] = { + SBR_VLC_ROW(t_huffman_env_1_5dB), + SBR_VLC_ROW(f_huffman_env_1_5dB), + SBR_VLC_ROW(t_huffman_env_bal_1_5dB), + SBR_VLC_ROW(f_huffman_env_bal_1_5dB), + SBR_VLC_ROW(t_huffman_env_3_0dB), + SBR_VLC_ROW(f_huffman_env_3_0dB), + SBR_VLC_ROW(t_huffman_env_bal_3_0dB), + SBR_VLC_ROW(f_huffman_env_bal_3_0dB), + SBR_VLC_ROW(t_huffman_noise_3_0dB), + SBR_VLC_ROW(t_huffman_noise_bal_3_0dB), + }; + + // SBR VLC table initialization + SBR_INIT_VLC_STATIC(0, 1098); + SBR_INIT_VLC_STATIC(1, 1092); + SBR_INIT_VLC_STATIC(2, 768); + SBR_INIT_VLC_STATIC(3, 1026); + SBR_INIT_VLC_STATIC(4, 1058); + SBR_INIT_VLC_STATIC(5, 1052); + SBR_INIT_VLC_STATIC(6, 544); + SBR_INIT_VLC_STATIC(7, 544); + SBR_INIT_VLC_STATIC(8, 592); + SBR_INIT_VLC_STATIC(9, 512); + + for (n = 0; n < 64; n++) { + float pre = M_PI * n / 64; + analysis_cos_pre[n] = cosf(pre); + analysis_sin_pre[n] = sinf(pre); + } + for (k = 0; k < 32; k++) { + float post = M_PI * (k + 0.5) / 128; + analysis_cossin_post[k][0] = 4.0 * cosf(post); + analysis_cossin_post[k][1] = -4.0 * sinf(post); + } + for (n = 1; n < 320; n++) + sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n]; + sbr_qmf_window_us[384] = -sbr_qmf_window_us[384]; + sbr_qmf_window_us[512] = -sbr_qmf_window_us[512]; + + for (n = 0; n < 320; n++) + sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n]; +} + +av_cold void ff_aac_sbr_ctx_init(SpectralBandReplication *sbr) +{ + sbr->kx[0] = sbr->kx[1] = 32; //Typo in spec, kx' inits to 32 + sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128); + sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128); + ff_mdct_init(&sbr->mdct, 7, 1, 1.0/64); + ff_rdft_init(&sbr->rdft, 6, IDFT_R2C); +} + +av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr) +{ + ff_mdct_end(&sbr->mdct); + ff_rdft_end(&sbr->rdft); +} + +static int qsort_comparison_function_int16(const void *a, const void *b) +{ + return *(const int16_t *)a - *(const int16_t *)b; +} + +static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle) +{ + int i; + for (i = 0; i <= last_el; i++) + if (table[i] == needle) + return 1; + return 0; +} + +/// Limiter Frequency Band Table (14496-3 sp04 p198) +static void sbr_make_f_tablelim(SpectralBandReplication *sbr) +{ + int k; + if (sbr->bs_limiter_bands > 0) { + static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2) + 1.18509277094158210129f, //2^(0.49/2) + 1.11987160404675912501f }; //2^(0.49/3) + const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1]; + int16_t patch_borders[5]; + uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim; + + patch_borders[0] = sbr->kx[1]; + for (k = 1; k <= sbr->num_patches; k++) + patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1]; + + memcpy(sbr->f_tablelim, sbr->f_tablelow, + (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0])); + if (sbr->num_patches > 1) + memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1, + (sbr->num_patches - 1) * sizeof(patch_borders[0])); + + qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0], + sizeof(sbr->f_tablelim[0]), + qsort_comparison_function_int16); + + sbr->n_lim = sbr->n[0] + sbr->num_patches - 1; + while (out < sbr->f_tablelim + sbr->n_lim) { + if (*in >= *out * lim_bands_per_octave_warped) { + *++out = *in++; + } else if (*in == *out || + !in_table_int16(patch_borders, sbr->num_patches, *in)) { + in++; + sbr->n_lim--; + } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) { + *out = *in++; + sbr->n_lim--; + } else { + *++out = *in++; + } + } + } else { + sbr->f_tablelim[0] = sbr->f_tablelow[0]; + sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]]; + sbr->n_lim = 1; + } +} + +static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb) +{ + unsigned int cnt = get_bits_count(gb); + uint8_t bs_header_extra_1; + uint8_t bs_header_extra_2; + int old_bs_limiter_bands = sbr->bs_limiter_bands; + SpectrumParameters old_spectrum_params; + + sbr->start = 1; + + // Save last spectrum parameters variables to compare to new ones + memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)); + + sbr->bs_amp_res_header = get_bits1(gb); + sbr->spectrum_params.bs_start_freq = get_bits(gb, 4); + sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4); + sbr->spectrum_params.bs_xover_band = get_bits(gb, 3); + skip_bits(gb, 2); // bs_reserved + + bs_header_extra_1 = get_bits1(gb); + bs_header_extra_2 = get_bits1(gb); + + if (bs_header_extra_1) { + sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2); + sbr->spectrum_params.bs_alter_scale = get_bits1(gb); + sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2); + } else { + sbr->spectrum_params.bs_freq_scale = 2; + sbr->spectrum_params.bs_alter_scale = 1; + sbr->spectrum_params.bs_noise_bands = 2; + } + + // Check if spectrum parameters changed + if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters))) + sbr->reset = 1; + + if (bs_header_extra_2) { + sbr->bs_limiter_bands = get_bits(gb, 2); + sbr->bs_limiter_gains = get_bits(gb, 2); + sbr->bs_interpol_freq = get_bits1(gb); + sbr->bs_smoothing_mode = get_bits1(gb); + } else { + sbr->bs_limiter_bands = 2; + sbr->bs_limiter_gains = 2; + sbr->bs_interpol_freq = 1; + sbr->bs_smoothing_mode = 1; + } + + if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset) + sbr_make_f_tablelim(sbr); + + return get_bits_count(gb) - cnt; +} + +static int array_min_int16(const int16_t *array, int nel) +{ + int i, min = array[0]; + for (i = 1; i < nel; i++) + min = FFMIN(array[i], min); + return min; +} + +static void make_bands(int16_t* bands, int start, int stop, int num_bands) +{ + int k, previous, present; + float base, prod; + + base = powf((float)stop / start, 1.0f / num_bands); + prod = start; + previous = start; + + for (k = 0; k < num_bands-1; k++) { + prod *= base; + present = lrintf(prod); + bands[k] = present - previous; + previous = present; + } + bands[num_bands-1] = stop - previous; +} + +static int check_n_master(AVCodecContext *avccontext, int n_master, int bs_xover_band) +{ + // Requirements (14496-3 sp04 p205) + if (n_master <= 0) { + av_log(avccontext, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master); + return -1; + } + if (bs_xover_band >= n_master) { + av_log(avccontext, AV_LOG_ERROR, + "Invalid bitstream, crossover band index beyond array bounds: %d\n", + bs_xover_band); + return -1; + } + return 0; +} + +/// Master Frequency Band Table (14496-3 sp04 p194) +static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr, + SpectrumParameters *spectrum) +{ + unsigned int temp, max_qmf_subbands; + unsigned int start_min, stop_min; + int k; + const int8_t *sbr_offset_ptr; + int16_t stop_dk[13]; + + if (sbr->sample_rate < 32000) { + temp = 3000; + } else if (sbr->sample_rate < 64000) { + temp = 4000; + } else + temp = 5000; + + start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate; + stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate; + + switch (sbr->sample_rate) { + case 16000: + sbr_offset_ptr = sbr_offset[0]; + break; + case 22050: + sbr_offset_ptr = sbr_offset[1]; + break; + case 24000: + sbr_offset_ptr = sbr_offset[2]; + break; + case 32000: + sbr_offset_ptr = sbr_offset[3]; + break; + case 44100: case 48000: case 64000: + sbr_offset_ptr = sbr_offset[4]; + break; + case 88200: case 96000: case 128000: case 176400: case 192000: + sbr_offset_ptr = sbr_offset[5]; + break; + default: + av_log(ac->avccontext, AV_LOG_ERROR, + "Unsupported sample rate for SBR: %d\n", sbr->sample_rate); + return -1; + } + + sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq]; + + if (spectrum->bs_stop_freq < 14) { + sbr->k[2] = stop_min; + make_bands(stop_dk, stop_min, 64, 13); + qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16); + for (k = 0; k < spectrum->bs_stop_freq; k++) + sbr->k[2] += stop_dk[k]; + } else if (spectrum->bs_stop_freq == 14) { + sbr->k[2] = 2*sbr->k[0]; + } else if (spectrum->bs_stop_freq == 15) { + sbr->k[2] = 3*sbr->k[0]; + } else { + av_log(ac->avccontext, AV_LOG_ERROR, + "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq); + return -1; + } + sbr->k[2] = FFMIN(64, sbr->k[2]); + + // Requirements (14496-3 sp04 p205) + if (sbr->sample_rate <= 32000) { + max_qmf_subbands = 48; + } else if (sbr->sample_rate == 44100) { + max_qmf_subbands = 35; + } else if (sbr->sample_rate >= 48000) + max_qmf_subbands = 32; + + if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) { + av_log(ac->avccontext, AV_LOG_ERROR, + "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]); + return -1; + } + + if (!spectrum->bs_freq_scale) { + unsigned int dk; + int k2diff; + + dk = spectrum->bs_alter_scale + 1; + sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1; + if (check_n_master(ac->avccontext, sbr->n_master, sbr->spectrum_params.bs_xover_band)) + return -1; + + for (k = 1; k <= sbr->n_master; k++) + sbr->f_master[k] = dk; + + k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk; + if (k2diff < 0) { + sbr->f_master[1]--; + sbr->f_master[2]-= (k2diff < 1); + } else if (k2diff) { + sbr->f_master[sbr->n_master]++; + } + + sbr->f_master[0] = sbr->k[0]; + for (k = 1; k <= sbr->n_master; k++) + sbr->f_master[k] += sbr->f_master[k - 1]; + + } else { + int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3} + int two_regions, num_bands_0; + int vdk0_max, vdk1_min; + int16_t vk0[49]; + + if (49 * sbr->k[2] > 110 * sbr->k[0]) { + two_regions = 1; + sbr->k[1] = 2 * sbr->k[0]; + } else { + two_regions = 0; + sbr->k[1] = sbr->k[2]; + } + + num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2; + + if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205) + av_log(ac->avccontext, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0); + return -1; + } + + vk0[0] = 0; + + make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0); + + qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16); + vdk0_max = vk0[num_bands_0]; + + vk0[0] = sbr->k[0]; + for (k = 1; k <= num_bands_0; k++) { + if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205) + av_log(ac->avccontext, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]); + return -1; + } + vk0[k] += vk0[k-1]; + } + + if (two_regions) { + int16_t vk1[49]; + float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f + : 1.0f; // bs_alter_scale = {0,1} + int num_bands_1 = lrintf(half_bands * invwarp * + log2f(sbr->k[2] / (float)sbr->k[1])) * 2; + + make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1); + + vdk1_min = array_min_int16(vk1 + 1, num_bands_1); + + if (vdk1_min < vdk0_max) { + int change; + qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16); + change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1); + vk1[1] += change; + vk1[num_bands_1] -= change; + } + + qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16); + + vk1[0] = sbr->k[1]; + for (k = 1; k <= num_bands_1; k++) { + if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205) + av_log(ac->avccontext, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]); + return -1; + } + vk1[k] += vk1[k-1]; + } + + sbr->n_master = num_bands_0 + num_bands_1; + if (check_n_master(ac->avccontext, sbr->n_master, sbr->spectrum_params.bs_xover_band)) + return -1; + memcpy(&sbr->f_master[0], vk0, + (num_bands_0 + 1) * sizeof(sbr->f_master[0])); + memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1, + num_bands_1 * sizeof(sbr->f_master[0])); + + } else { + sbr->n_master = num_bands_0; + if (check_n_master(ac->avccontext, sbr->n_master, sbr->spectrum_params.bs_xover_band)) + return -1; + memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0])); + } + } + + return 0; +} + +/// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46) +static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr) +{ + int i, k, sb = 0; + int msb = sbr->k[0]; + int usb = sbr->kx[1]; + int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate; + + sbr->num_patches = 0; + + if (goal_sb < sbr->kx[1] + sbr->m[1]) { + for (k = 0; sbr->f_master[k] < goal_sb; k++) ; + } else + k = sbr->n_master; + + do { + int odd = 0; + for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) { + sb = sbr->f_master[i]; + odd = (sb + sbr->k[0]) & 1; + } + + sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0); + sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches]; + + if (sbr->patch_num_subbands[sbr->num_patches] > 0) { + usb = sb; + msb = sb; + sbr->num_patches++; + } else + msb = sbr->kx[1]; + + if (sbr->f_master[k] - sb < 3) + k = sbr->n_master; + } while (sb != sbr->kx[1] + sbr->m[1]); + + if (sbr->patch_num_subbands[sbr->num_patches-1] < 3 && sbr->num_patches > 1) + sbr->num_patches--; + + // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5 + // However the Coding Technologies decoder check uses 6 patches + if (sbr->num_patches > 6) { + av_log(ac->avccontext, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches); + return -1; + } + + return 0; +} + +/// Derived Frequency Band Tables (14496-3 sp04 p197) +static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr) +{ + int k, temp; + + sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band; + sbr->n[0] = (sbr->n[1] + 1) >> 1; + + memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band], + (sbr->n[1] + 1) * sizeof(sbr->f_master[0])); + sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0]; + sbr->kx[1] = sbr->f_tablehigh[0]; + + // Requirements (14496-3 sp04 p205) + if (sbr->kx[1] + sbr->m[1] > 64) { + av_log(ac->avccontext, AV_LOG_ERROR, + "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]); + return -1; + } + if (sbr->kx[1] > 32) { + av_log(ac->avccontext, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]); + return -1; + } + + sbr->f_tablelow[0] = sbr->f_tablehigh[0]; + temp = sbr->n[1] & 1; + for (k = 1; k <= sbr->n[0]; k++) + sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp]; + + sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands * + log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3 + if (sbr->n_q > 5) { + av_log(ac->avccontext, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q); + return -1; + } + + sbr->f_tablenoise[0] = sbr->f_tablelow[0]; + temp = 0; + for (k = 1; k <= sbr->n_q; k++) { + temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k); + sbr->f_tablenoise[k] = sbr->f_tablelow[temp]; + } + + if (sbr_hf_calc_npatches(ac, sbr) < 0) + return -1; + + sbr_make_f_tablelim(sbr); + + sbr->data[0].f_indexnoise = 0; + sbr->data[1].f_indexnoise = 0; + + return 0; +} + +static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec, + int elements) +{ + int i; + for (i = 0; i < elements; i++) { + vec[i] = get_bits1(gb); + } +} + +/** ceil(log2(index+1)) */ +static const int8_t ceil_log2[] = { + 0, 1, 2, 2, 3, 3, +}; + +static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr, + GetBitContext *gb, SBRData *ch_data) +{ + int i; + + ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env[1]]; + ch_data->bs_num_env[0] = ch_data->bs_num_env[1]; + ch_data->bs_amp_res = sbr->bs_amp_res_header; + + switch (ch_data->bs_frame_class = get_bits(gb, 2)) { + case FIXFIX: + ch_data->bs_num_env[1] = 1 << get_bits(gb, 2); + if (ch_data->bs_num_env[1] == 1) + ch_data->bs_amp_res = 0; + + ch_data->bs_freq_res[1] = get_bits1(gb); + for (i = 1; i < ch_data->bs_num_env[1]; i++) + ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1]; + break; + case FIXVAR: + ch_data->bs_var_bord[1] = get_bits(gb, 2); + ch_data->bs_num_rel[1] = get_bits(gb, 2); + ch_data->bs_num_env[1] = ch_data->bs_num_rel[1] + 1; + + for (i = 0; i < ch_data->bs_num_rel[1]; i++) + ch_data->bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2; + + ch_data->bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]); + + for (i = 0; i < ch_data->bs_num_env[1]; i++) + ch_data->bs_freq_res[ch_data->bs_num_env[1] - i] = get_bits1(gb); + break; + case VARFIX: + ch_data->bs_var_bord[0] = get_bits(gb, 2); + ch_data->bs_num_rel[0] = get_bits(gb, 2); + ch_data->bs_num_env[1] = ch_data->bs_num_rel[0] + 1; + + for (i = 0; i < ch_data->bs_num_rel[0]; i++) + ch_data->bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2; + + ch_data->bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]); + + get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env[1]); + break; + case VARVAR: + ch_data->bs_var_bord[0] = get_bits(gb, 2); + ch_data->bs_var_bord[1] = get_bits(gb, 2); + ch_data->bs_num_rel[0] = get_bits(gb, 2); + ch_data->bs_num_rel[1] = get_bits(gb, 2); + ch_data->bs_num_env[1] = ch_data->bs_num_rel[0] + ch_data->bs_num_rel[1] + 1; + + for (i = 0; i < ch_data->bs_num_rel[0]; i++) + ch_data->bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2; + for (i = 0; i < ch_data->bs_num_rel[1]; i++) + ch_data->bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2; + + ch_data->bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]); + + get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env[1]); + break; + } + + if (ch_data->bs_frame_class == FIXFIX && ch_data->bs_num_env[1] > 4) { + av_log(ac->avccontext, AV_LOG_ERROR, + "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n", + ch_data->bs_num_env[1]); + return -1; + } + if (ch_data->bs_frame_class == VARVAR && ch_data->bs_num_env[1] > 5) { + av_log(ac->avccontext, AV_LOG_ERROR, + "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n", + ch_data->bs_num_env[1]); + return -1; + } + + ch_data->bs_num_noise = (ch_data->bs_num_env[1] > 1) + 1; + + return 0; +} + +static void copy_sbr_grid(SBRData *dst, const SBRData *src) { + //These variables are saved from the previous frame rather than copied + dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env[1]]; + dst->bs_num_env[0] = dst->bs_num_env[1]; + + //These variables are read from the bitstream and therefore copied + memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res)); + memcpy(dst->bs_num_env+1, src->bs_num_env+1, sizeof(dst->bs_num_env)- sizeof(*dst->bs_num_env)); + memcpy(dst->bs_var_bord, src->bs_var_bord, sizeof(dst->bs_var_bord)); + memcpy(dst->bs_rel_bord, src->bs_rel_bord, sizeof(dst->bs_rel_bord)); + memcpy(dst->bs_num_rel, src->bs_num_rel, sizeof(dst->bs_rel_bord)); + dst->bs_amp_res = src->bs_amp_res; + dst->bs_num_noise = src->bs_num_noise; + dst->bs_pointer = src->bs_pointer; + dst->bs_frame_class = src->bs_frame_class; +} + +/// Read how the envelope and noise floor data is delta coded +static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb, + SBRData *ch_data) +{ + get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env[1]); + get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise); +} + +/// Read inverse filtering data +static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb, + SBRData *ch_data) +{ + int i; + + memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t)); + for (i = 0; i < sbr->n_q; i++) + ch_data->bs_invf_mode[0][i] = get_bits(gb, 2); +} + +static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb, + SBRData *ch_data, int ch) +{ + int bits; + int i, j, k; + VLC_TYPE (*t_huff)[2], (*f_huff)[2]; + int t_lav, f_lav; + const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1; + const int odd = sbr->n[1] & 1; + + if (sbr->bs_coupling && ch) { + if (ch_data->bs_amp_res) { + bits = 5; + t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table; + t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB]; + f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table; + f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB]; + } else { + bits = 6; + t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table; + t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB]; + f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table; + f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB]; + } + } else { + if (ch_data->bs_amp_res) { + bits = 6; + t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table; + t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB]; + f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table; + f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB]; + } else { + bits = 7; + t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table; + t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB]; + f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table; + f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB]; + } + } + + for (i = 0; i < ch_data->bs_num_env[1]; i++) { + if (ch_data->bs_df_env[i]) { + // bs_freq_res[0] == bs_freq_res[bs_num_env[1]] from prev frame + if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) { + for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) + ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav); + } else if (ch_data->bs_freq_res[i + 1]) { + for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) { + k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1] + ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav); + } + } else { + for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) { + k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j] + ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav); + } + } + } else { + ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance + for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) + 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); + } + } + + //assign 0th elements of env_facs from last elements + memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env[1]], + sizeof(ch_data->env_facs[0])); +} + +static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb, + SBRData *ch_data, int ch) +{ + int i, j; + VLC_TYPE (*t_huff)[2], (*f_huff)[2]; + int t_lav, f_lav; + int delta = (ch == 1 && sbr->bs_coupling == 1) + 1; + + if (sbr->bs_coupling && ch) { + t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table; + t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB]; + f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table; + f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB]; + } else { + t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table; + t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB]; + f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table; + f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB]; + } + + for (i = 0; i < ch_data->bs_num_noise; i++) { + if (ch_data->bs_df_noise[i]) { + for (j = 0; j < sbr->n_q; j++) + ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav); + } else { + ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level + for (j = 1; j < sbr->n_q; j++) + 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); + } + } + + //assign 0th elements of noise_facs from last elements + memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise], + sizeof(ch_data->noise_facs[0])); +} + +static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr, + GetBitContext *gb, + int bs_extension_id, int *num_bits_left) +{ +//TODO - implement ps_data for parametric stereo parsing + switch (bs_extension_id) { + case EXTENSION_ID_PS: +#if 0 + *num_bits_left -= ff_ps_data(gb, ps); +#else + av_log_missing_feature(ac->avccontext, "Parametric Stereo is", 0); + skip_bits_long(gb, *num_bits_left); // bs_fill_bits + *num_bits_left = 0; +#endif + break; + default: + av_log_missing_feature(ac->avccontext, "Reserved SBR extensions are", 1); + skip_bits_long(gb, *num_bits_left); // bs_fill_bits + *num_bits_left = 0; + break; + } +} + +static void read_sbr_single_channel_element(AACContext *ac, + SpectralBandReplication *sbr, + GetBitContext *gb) +{ + if (get_bits1(gb)) // bs_data_extra + skip_bits(gb, 4); // bs_reserved + + read_sbr_grid(ac, sbr, gb, &sbr->data[0]); + read_sbr_dtdf(sbr, gb, &sbr->data[0]); + read_sbr_invf(sbr, gb, &sbr->data[0]); + read_sbr_envelope(sbr, gb, &sbr->data[0], 0); + read_sbr_noise(sbr, gb, &sbr->data[0], 0); + + if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb))) + get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]); +} + +static void read_sbr_channel_pair_element(AACContext *ac, + SpectralBandReplication *sbr, + GetBitContext *gb) +{ + if (get_bits1(gb)) // bs_data_extra + skip_bits(gb, 8); // bs_reserved + + if ((sbr->bs_coupling = get_bits1(gb))) { + read_sbr_grid(ac, sbr, gb, &sbr->data[0]); + copy_sbr_grid(&sbr->data[1], &sbr->data[0]); + read_sbr_dtdf(sbr, gb, &sbr->data[0]); + read_sbr_dtdf(sbr, gb, &sbr->data[1]); + read_sbr_invf(sbr, gb, &sbr->data[0]); + memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0])); + memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0])); + read_sbr_envelope(sbr, gb, &sbr->data[0], 0); + read_sbr_noise(sbr, gb, &sbr->data[0], 0); + read_sbr_envelope(sbr, gb, &sbr->data[1], 1); + read_sbr_noise(sbr, gb, &sbr->data[1], 1); + } else { + read_sbr_grid(ac, sbr, gb, &sbr->data[0]); + read_sbr_grid(ac, sbr, gb, &sbr->data[1]); + read_sbr_dtdf(sbr, gb, &sbr->data[0]); + read_sbr_dtdf(sbr, gb, &sbr->data[1]); + read_sbr_invf(sbr, gb, &sbr->data[0]); + read_sbr_invf(sbr, gb, &sbr->data[1]); + read_sbr_envelope(sbr, gb, &sbr->data[0], 0); + read_sbr_envelope(sbr, gb, &sbr->data[1], 1); + read_sbr_noise(sbr, gb, &sbr->data[0], 0); + read_sbr_noise(sbr, gb, &sbr->data[1], 1); + } + + if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb))) + get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]); + if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb))) + get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]); +} + +static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr, + GetBitContext *gb, int id_aac) +{ + unsigned int cnt = get_bits_count(gb); + + if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) { + read_sbr_single_channel_element(ac, sbr, gb); + } else if (id_aac == TYPE_CPE) { + read_sbr_channel_pair_element(ac, sbr, gb); + } else { + av_log(ac->avccontext, AV_LOG_ERROR, + "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac); + sbr->start = 0; + return get_bits_count(gb) - cnt; + } + if (get_bits1(gb)) { // bs_extended_data + int num_bits_left = get_bits(gb, 4); // bs_extension_size + if (num_bits_left == 15) + num_bits_left += get_bits(gb, 8); // bs_esc_count + + num_bits_left <<= 3; + while (num_bits_left > 7) { + num_bits_left -= 2; + read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id + } + } + + return get_bits_count(gb) - cnt; +} + +static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr) +{ + int err; + err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params); + if (err >= 0) + err = sbr_make_f_derived(ac, sbr); + if (err < 0) { + av_log(ac->avccontext, AV_LOG_ERROR, + "SBR reset failed. Switching SBR to pure upsampling mode.\n"); + sbr->start = 0; + } +} + +/** + * Decode Spectral Band Replication extension data; reference: table 4.55. + * + * @param crc flag indicating the presence of CRC checksum + * @param cnt length of TYPE_FIL syntactic element in bytes + * + * @return Returns number of bytes consumed from the TYPE_FIL element. + */ +int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr, + GetBitContext *gb_host, int crc, int cnt, int id_aac) +{ + unsigned int num_sbr_bits = 0, num_align_bits; + unsigned bytes_read; + GetBitContext gbc = *gb_host, *gb = &gbc; + skip_bits_long(gb_host, cnt*8 - 4); + + sbr->reset = 0; + + if (!sbr->sample_rate) + sbr->sample_rate = 2 * ac->m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support + if (!ac->m4ac.ext_sample_rate) + ac->m4ac.ext_sample_rate = 2 * ac->m4ac.sample_rate; + + if (crc) { + skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check + num_sbr_bits += 10; + } + + //Save some state from the previous frame. + sbr->kx[0] = sbr->kx[1]; + sbr->m[0] = sbr->m[1]; + + num_sbr_bits++; + if (get_bits1(gb)) // bs_header_flag + num_sbr_bits += read_sbr_header(sbr, gb); + + if (sbr->reset) + sbr_reset(ac, sbr); + + if (sbr->start) + num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac); + + num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7; + bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3); + + if (bytes_read > cnt) { + av_log(ac->avccontext, AV_LOG_ERROR, + "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read); + } + return cnt; +} + +/// Time/frequency Grid (14496-3 sp04 p200) +static int sbr_time_freq_grid(AACContext *ac, SpectralBandReplication *sbr, + SBRData *ch_data, int ch) +{ + int abs_bord_lead = ch_data->bs_frame_class >= 2 ? ch_data->bs_var_bord[0] : 0; + // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots + int abs_bord_trail = (ch_data->bs_frame_class & 1 ? ch_data->bs_var_bord[1] : 0) + 16; + int n_rel_lead; + int i; + + if (ch_data->bs_frame_class == FIXFIX) { + n_rel_lead = ch_data->bs_num_env[1] - 1; + } else if (ch_data->bs_frame_class == FIXVAR) { + n_rel_lead = 0; + } else if (ch_data->bs_frame_class < 4) { // VARFIX or VARVAR + n_rel_lead = ch_data->bs_num_rel[0]; + } else { + av_log(ac->avccontext, AV_LOG_ERROR, + "Invalid bs_frame_class for SBR: %d\n", ch_data->bs_frame_class); + return -1; + } + + ch_data->t_env_num_env_old = ch_data->t_env[ch_data->bs_num_env[0]]; + ch_data->t_env[0] = abs_bord_lead; + ch_data->t_env[ch_data->bs_num_env[1]] = abs_bord_trail; + + if (ch_data->bs_frame_class == FIXFIX) { + int temp = (abs_bord_trail + (ch_data->bs_num_env[1] >> 1)) / + ch_data->bs_num_env[1]; + for (i = 0; i < n_rel_lead; i++) + ch_data->t_env[i + 1] = ch_data->t_env[i] + temp; + } else if (ch_data->bs_frame_class > 1) { // VARFIX or VARVAR + for (i = 0; i < n_rel_lead; i++) + ch_data->t_env[i + 1] = ch_data->t_env[i] + ch_data->bs_rel_bord[0][i]; + } else { // FIXVAR + for (i = 0; i < n_rel_lead; i++) + ch_data->t_env[i + 1] = abs_bord_lead; + } + + if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR + for (i = ch_data->bs_num_env[1] - 1; i > n_rel_lead; i--) + ch_data->t_env[i] = ch_data->t_env[i + 1] - + ch_data->bs_rel_bord[1][ch_data->bs_num_env[1] - 1 - i]; + } else { // FIXFIX or VARFIX + for (i = n_rel_lead; i < ch_data->bs_num_env[1]; i++) + ch_data->t_env[i + 1] = abs_bord_trail; + } + + ch_data->t_q[0] = ch_data->t_env[0]; + if (ch_data->bs_num_noise > 1) { // typo in spec bases this on bs_num_env... + unsigned int idx; + if (ch_data->bs_frame_class == FIXFIX) { + idx = ch_data->bs_num_env[1] >> 1; + } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR + idx = ch_data->bs_num_env[1] - FFMAX(ch_data->bs_pointer - 1, 1); + } else { // VARFIX + if (!ch_data->bs_pointer) + idx = 1; + else if (ch_data->bs_pointer == 1) + idx = ch_data->bs_num_env[1] - 1; + else // bs_pointer > 1 + idx = ch_data->bs_pointer - 1; + } + ch_data->t_q[1] = ch_data->t_env[idx]; + ch_data->t_q[2] = ch_data->t_env[ch_data->bs_num_env[1]]; + } else + ch_data->t_q[1] = ch_data->t_env[ch_data->bs_num_env[1]]; + + return 0; +} + +/// Dequantization and stereo decoding (14496-3 sp04 p203) +static void sbr_dequant(SpectralBandReplication *sbr, int id_aac) +{ + int k, e; + int ch; + + if (id_aac == TYPE_CPE && sbr->bs_coupling) { + float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f; + float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f; + for (e = 1; e <= sbr->data[0].bs_num_env[1]; e++) { + for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) { + float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f); + float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha); + float fac = temp1 / (1.0f + temp2); + sbr->data[0].env_facs[e][k] = fac; + sbr->data[1].env_facs[e][k] = fac * temp2; + } + } + for (e = 1; e <= sbr->data[0].bs_num_noise; e++) { + for (k = 0; k < sbr->n_q; k++) { + float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1); + float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]); + float fac = temp1 / (1.0f + temp2); + sbr->data[0].noise_facs[e][k] = fac; + sbr->data[1].noise_facs[e][k] = fac * temp2; + } + } + } else { // SCE or one non-coupled CPE + for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) { + float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f; + for (e = 1; e <= sbr->data[ch].bs_num_env[1]; e++) + for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++) + sbr->data[ch].env_facs[e][k] = + exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f); + for (e = 1; e <= sbr->data[ch].bs_num_noise; e++) + for (k = 0; k < sbr->n_q; k++) + sbr->data[ch].noise_facs[e][k] = + exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]); + } + } +} + +/** + * Analysis QMF Bank (14496-3 sp04 p206) + * + * @param x pointer to the beginning of the first sample window + * @param W array of complex-valued samples split into subbands + */ +static void sbr_qmf_analysis(DSPContext *dsp, RDFTContext *rdft, const float *in, float *x, + float z[320], float W[2][32][32][2], + float bias, float scale) +{ + int i, k; + memcpy(W[0], W[1], sizeof(W[0])); + memcpy(x , x+1024, (320-32)*sizeof(x[0])); + if (scale != 1.0f || bias != 0.0f) + for (i = 0; i < 1024; i++) + x[288 + i] = (in[i] - bias) * scale; + else + memcpy(x+288, in, 1024*sizeof(*x)); + for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames + // are not supported + float re, im; + dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320); + for (k = 0; k < 64; k++) { + float f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256]; + z[k] = f * analysis_cos_pre[k]; + z[k+64] = f; + } + ff_rdft_calc(rdft, z); + re = z[0] * 0.5f; + im = 0.5f * dsp->scalarproduct_float(z+64, analysis_sin_pre, 64); + W[1][i][0][0] = re * analysis_cossin_post[0][0] - im * analysis_cossin_post[0][1]; + W[1][i][0][1] = re * analysis_cossin_post[0][1] + im * analysis_cossin_post[0][0]; + for (k = 1; k < 32; k++) { + re = z[2*k ] - re; + im = z[2*k+1] - im; + W[1][i][k][0] = re * analysis_cossin_post[k][0] - im * analysis_cossin_post[k][1]; + W[1][i][k][1] = re * analysis_cossin_post[k][1] + im * analysis_cossin_post[k][0]; + } + x += 32; + } +} + +/** + * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank + * (14496-3 sp04 p206) + */ +static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct, + float *out, float X[2][32][64], + float mdct_buf[2][64], + float *v0, int *v_off, const unsigned int div, + float bias, float scale) +{ + int i, n; + const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us; + int scale_and_bias = scale != 1.0f || bias != 0.0f; + float *v; + for (i = 0; i < 32; i++) { + if (*v_off == 0) { + int saved_samples = (1280 - 128) >> div; + memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float)); + *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - (128 >> div); + } else { + *v_off -= 128 >> div; + } + v = v0 + *v_off; + for (n = 1; n < 64 >> div; n+=2) { + X[1][i][n] = -X[1][i][n]; + } + if (div) { + memset(X[0][i]+32, 0, 32*sizeof(float)); + memset(X[1][i]+32, 0, 32*sizeof(float)); + } + ff_imdct_half(mdct, mdct_buf[0], X[0][i]); + ff_imdct_half(mdct, mdct_buf[1], X[1][i]); + if (div) { + for (n = 0; n < 32; n++) { + v[ n] = -mdct_buf[0][63 - 2*n] + mdct_buf[1][2*n ]; + v[ 63 - n] = mdct_buf[0][62 - 2*n] + mdct_buf[1][2*n + 1]; + } + } else { + for (n = 0; n < 64; n++) { + v[ n] = -mdct_buf[0][63 - n] + mdct_buf[1][ n ]; + v[127 - n] = mdct_buf[0][63 - n] + mdct_buf[1][ n ]; + } + } + dsp->vector_fmul_add(out, v , sbr_qmf_window , zero64, 64 >> div); + dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div); + dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div); + dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div); + dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div); + dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div); + dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div); + dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div); + dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div); + dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div); + if (scale_and_bias) + for (n = 0; n < 64 >> div; n++) + out[n] = out[n] * scale + bias; + out += 64 >> div; + } +} + +static void autocorrelate(const float x[40][2], float phi[3][2][2], int lag) +{ + int i; + float real_sum = 0.0f; + float imag_sum = 0.0f; + if (lag) { + for (i = 1; i < 38; i++) { + real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1]; + imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0]; + } + phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1]; + phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0]; + if (lag == 1) { + phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1]; + phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0]; + } + } else { + for (i = 1; i < 38; i++) { + real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1]; + } + phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1]; + phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1]; + } +} + +/** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering + * (14496-3 sp04 p214) + * Warning: This routine does not seem numerically stable. + */ +static void sbr_hf_inverse_filter(float (*alpha0)[2], float (*alpha1)[2], + const float X_low[32][40][2], int k0) +{ + int k; + for (k = 0; k < k0; k++) { + float phi[3][2][2], dk; + + autocorrelate(X_low[k], phi, 0); + autocorrelate(X_low[k], phi, 1); + autocorrelate(X_low[k], phi, 2); + + dk = phi[2][1][0] * phi[1][0][0] - + (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f; + + if (!dk) { + alpha1[k][0] = 0; + alpha1[k][1] = 0; + } else { + float temp_real, temp_im; + temp_real = phi[0][0][0] * phi[1][1][0] - + phi[0][0][1] * phi[1][1][1] - + phi[0][1][0] * phi[1][0][0]; + temp_im = phi[0][0][0] * phi[1][1][1] + + phi[0][0][1] * phi[1][1][0] - + phi[0][1][1] * phi[1][0][0]; + + alpha1[k][0] = temp_real / dk; + alpha1[k][1] = temp_im / dk; + } + + if (!phi[1][0][0]) { + alpha0[k][0] = 0; + alpha0[k][1] = 0; + } else { + float temp_real, temp_im; + temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] + + alpha1[k][1] * phi[1][1][1]; + temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] - + alpha1[k][0] * phi[1][1][1]; + + alpha0[k][0] = -temp_real / phi[1][0][0]; + alpha0[k][1] = -temp_im / phi[1][0][0]; + } + + if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f || + alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) { + alpha1[k][0] = 0; + alpha1[k][1] = 0; + alpha0[k][0] = 0; + alpha0[k][1] = 0; + } + } +} + +/// Chirp Factors (14496-3 sp04 p214) +static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data) +{ + int i; + float new_bw; + static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f }; + + for (i = 0; i < sbr->n_q; i++) { + if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) { + new_bw = 0.6f; + } else + new_bw = bw_tab[ch_data->bs_invf_mode[0][i]]; + + if (new_bw < ch_data->bw_array[i]) { + new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i]; + } else + new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i]; + ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw; + } +} + +/// Generate the subband filtered lowband +static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr, + float X_low[32][40][2], const float W[2][32][32][2]) +{ + int i, k; + const int t_HFGen = 8; + const int i_f = 32; + memset(X_low, 0, 32*sizeof(*X_low)); + for (k = 0; k < sbr->kx[1]; k++) { + for (i = t_HFGen; i < i_f + t_HFGen; i++) { + X_low[k][i][0] = W[1][i - t_HFGen][k][0]; + X_low[k][i][1] = W[1][i - t_HFGen][k][1]; + } + } + for (k = 0; k < sbr->kx[0]; k++) { + for (i = 0; i < t_HFGen; i++) { + X_low[k][i][0] = W[0][i + i_f - t_HFGen][k][0]; + X_low[k][i][1] = W[0][i + i_f - t_HFGen][k][1]; + } + } + return 0; +} + +/// High Frequency Generator (14496-3 sp04 p215) +static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr, + float X_high[64][40][2], const float X_low[32][40][2], + const float (*alpha0)[2], const float (*alpha1)[2], + const float bw_array[5], const uint8_t *t_env, + int bs_num_env) +{ + int i, j, x; + int g = 0; + int k = sbr->kx[1]; + for (j = 0; j < sbr->num_patches; j++) { + for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) { + float alpha[4]; + const int p = sbr->patch_start_subband[j] + x; + while (g <= sbr->n_q && k >= sbr->f_tablenoise[g]) + g++; + g--; + + if (g < 0) { + av_log(ac->avccontext, AV_LOG_ERROR, + "ERROR : no subband found for frequency %d\n", k); + return -1; + } + + alpha[0] = alpha1[p][0] * bw_array[g] * bw_array[g]; + alpha[1] = alpha1[p][1] * bw_array[g] * bw_array[g]; + alpha[2] = alpha0[p][0] * bw_array[g]; + alpha[3] = alpha0[p][1] * bw_array[g]; + + for (i = 2 * t_env[0]; i < 2 * t_env[bs_num_env]; i++) { + const int idx = i + ENVELOPE_ADJUSTMENT_OFFSET; + X_high[k][idx][0] = + X_low[p][idx - 2][0] * alpha[0] - + X_low[p][idx - 2][1] * alpha[1] + + X_low[p][idx - 1][0] * alpha[2] - + X_low[p][idx - 1][1] * alpha[3] + + X_low[p][idx][0]; + X_high[k][idx][1] = + X_low[p][idx - 2][1] * alpha[0] + + X_low[p][idx - 2][0] * alpha[1] + + X_low[p][idx - 1][1] * alpha[2] + + X_low[p][idx - 1][0] * alpha[3] + + X_low[p][idx][1]; + } + } + } + if (k < sbr->m[1] + sbr->kx[1]) + memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high)); + + return 0; +} + +/// Generate the subband filtered lowband +static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][32][64], + const float X_low[32][40][2], const float Y[2][38][64][2], + int ch) +{ + int k, i; + const int i_f = 32; + const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0); + memset(X, 0, 2*sizeof(*X)); + for (k = 0; k < sbr->kx[0]; k++) { + for (i = 0; i < i_Temp; i++) { + X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0]; + X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1]; + } + } + for (; k < sbr->kx[0] + sbr->m[0]; k++) { + for (i = 0; i < i_Temp; i++) { + X[0][i][k] = Y[0][i + i_f][k][0]; + X[1][i][k] = Y[0][i + i_f][k][1]; + } + } + + for (k = 0; k < sbr->kx[1]; k++) { + for (i = i_Temp; i < i_f; i++) { + X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0]; + X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1]; + } + } + for (; k < sbr->kx[1] + sbr->m[1]; k++) { + for (i = i_Temp; i < i_f; i++) { + X[0][i][k] = Y[1][i][k][0]; + X[1][i][k] = Y[1][i][k][1]; + } + } + return 0; +} + +/** High Frequency Adjustment (14496-3 sp04 p217) and Mapping + * (14496-3 sp04 p217) + */ +static void sbr_mapping(AACContext *ac, SpectralBandReplication *sbr, + SBRData *ch_data, int e_a[2]) +{ + int e, i, m; + + e_a[0] = -(e_a[1] != ch_data->bs_num_env[0]); // l_APrev + e_a[1] = -1; + if ((ch_data->bs_frame_class & 1) && ch_data->bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0 + e_a[1] = ch_data->bs_num_env[1] + 1 - ch_data->bs_pointer; + } else if ((ch_data->bs_frame_class == 2) && (ch_data->bs_pointer > 1)) // VARFIX and bs_pointer > 1 + e_a[1] = ch_data->bs_pointer - 1; + + memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1])); + for (e = 0; e < ch_data->bs_num_env[1]; e++) { + const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]]; + uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow; + int k; + + for (i = 0; i < ilim; i++) + for (m = table[i]; m < table[i + 1]; m++) + sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i]; + + // ch_data->bs_num_noise > 1 => 2 noise floors + k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]); + for (i = 0; i < sbr->n_q; i++) + for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++) + sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i]; + + for (i = 0; i < sbr->n[1]; i++) { + if (ch_data->bs_add_harmonic_flag) { + const unsigned int m_midpoint = + (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1; + + ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] * + (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1)); + } + } + + for (i = 0; i < ilim; i++) { + int additional_sinusoid_present = 0; + for (m = table[i]; m < table[i + 1]; m++) { + if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) { + additional_sinusoid_present = 1; + break; + } + } + memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present, + (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0])); + } + } + + memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env[1]], sizeof(ch_data->s_indexmapped[0])); +} + +/// Estimation of current envelope (14496-3 sp04 p218) +static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2], + SpectralBandReplication *sbr, SBRData *ch_data) +{ + int e, i, m; + + if (sbr->bs_interpol_freq) { + for (e = 0; e < ch_data->bs_num_env[1]; e++) { + const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]); + int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET; + int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET; + + for (m = 0; m < sbr->m[1]; m++) { + float sum = 0.0f; + + for (i = ilb; i < iub; i++) { + sum += X_high[m + sbr->kx[1]][i][0] * X_high[m + sbr->kx[1]][i][0] + + X_high[m + sbr->kx[1]][i][1] * X_high[m + sbr->kx[1]][i][1]; + } + e_curr[e][m] = sum * recip_env_size; + } + } + } else { + int k, p; + + for (e = 0; e < ch_data->bs_num_env[1]; e++) { + const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]); + int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET; + int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET; + const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow; + + for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) { + float sum = 0.0f; + const int den = env_size * (table[p + 1] - table[p]); + + for (k = table[p]; k < table[p + 1]; k++) { + for (i = ilb; i < iub; i++) { + sum += X_high[k][i][0] * X_high[k][i][0] + + X_high[k][i][1] * X_high[k][i][1]; + } + } + sum /= den; + for (k = table[p]; k < table[p + 1]; k++) { + e_curr[e][k - sbr->kx[1]] = sum; + } + } + } + } +} + +/** + * Calculation of levels of additional HF signal components (14496-3 sp04 p219) + * and Calculation of gain (14496-3 sp04 p219) + */ +static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr, + SBRData *ch_data, const int e_a[2]) +{ + int e, k, m; + // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off) + static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 }; + + for (e = 0; e < ch_data->bs_num_env[1]; e++) { + int delta = !((e == e_a[1]) || (e == e_a[0])); + for (k = 0; k < sbr->n_lim; k++) { + float gain_boost, gain_max; + float sum[2] = { 0.0f, 0.0f }; + for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { + const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]); + sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]); + sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]); + if (!sbr->s_mapped[e][m]) { + sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] / + ((1.0f + sbr->e_curr[e][m]) * + (1.0f + sbr->q_mapped[e][m] * delta))); + } else { + sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] / + ((1.0f + sbr->e_curr[e][m]) * + (1.0f + sbr->q_mapped[e][m]))); + } + } + for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { + sum[0] += sbr->e_origmapped[e][m]; + sum[1] += sbr->e_curr[e][m]; + } + gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1])); + gain_max = FFMIN(100000, gain_max); + for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { + float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m]; + sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max); + sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max); + } + sum[0] = sum[1] = 0.0f; + for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { + sum[0] += sbr->e_origmapped[e][m]; + sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m] + + sbr->s_m[e][m] * sbr->s_m[e][m] + + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m]; + } + gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1])); + gain_boost = FFMIN(1.584893192, gain_boost); + for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { + sbr->gain[e][m] *= gain_boost; + sbr->q_m[e][m] *= gain_boost; + sbr->s_m[e][m] *= gain_boost; + } + } + } +} + +/// Assembling HF Signals (14496-3 sp04 p220) +static void sbr_hf_assemble(float Y[2][38][64][2], const float X_high[64][40][2], + SpectralBandReplication *sbr, SBRData *ch_data, + const int e_a[2]) +{ + int e, i, j, m; + const int h_SL = 4 * !sbr->bs_smoothing_mode; + const int kx = sbr->kx[1]; + const int m_max = sbr->m[1]; + static const float h_smooth[5] = { + 0.33333333333333, + 0.30150283239582, + 0.21816949906249, + 0.11516383427084, + 0.03183050093751, + }; + static const int8_t phi[2][4] = { + { 1, 0, -1, 0}, // real + { 0, 1, 0, -1}, // imaginary + }; + float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp; + int indexnoise = ch_data->f_indexnoise; + int indexsine = ch_data->f_indexsine; + memcpy(Y[0], Y[1], sizeof(Y[0])); + + if (sbr->reset) { + for (i = 0; i < h_SL; i++) { + memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0])); + memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0])); + } + } else if (h_SL) { + memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0])); + memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0])); + } + + for (e = 0; e < ch_data->bs_num_env[1]; e++) { + for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) { + memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0])); + memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0])); + } + } + + for (e = 0; e < ch_data->bs_num_env[1]; e++) { + for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) { + int phi_sign = (1 - 2*(kx & 1)); + + if (h_SL && e != e_a[0] && e != e_a[1]) { + for (m = 0; m < m_max; m++) { + const int idx1 = i + h_SL; + float g_filt = 0.0f; + for (j = 0; j <= h_SL; j++) + g_filt += g_temp[idx1 - j][m] * h_smooth[j]; + Y[1][i][m + kx][0] = + X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt; + Y[1][i][m + kx][1] = + X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt; + } + } else { + for (m = 0; m < m_max; m++) { + const float g_filt = g_temp[i + h_SL][m]; + Y[1][i][m + kx][0] = + X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt; + Y[1][i][m + kx][1] = + X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt; + } + } + + if (e != e_a[0] && e != e_a[1]) { + for (m = 0; m < m_max; m++) { + indexnoise = (indexnoise + 1) & 0x1ff; + if (sbr->s_m[e][m]) { + Y[1][i][m + kx][0] += + sbr->s_m[e][m] * phi[0][indexsine]; + Y[1][i][m + kx][1] += + sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign); + } else { + float q_filt; + if (h_SL) { + const int idx1 = i + h_SL; + q_filt = 0.0f; + for (j = 0; j <= h_SL; j++) + q_filt += q_temp[idx1 - j][m] * h_smooth[j]; + } else { + q_filt = q_temp[i][m]; + } + Y[1][i][m + kx][0] += + q_filt * sbr_noise_table[indexnoise][0]; + Y[1][i][m + kx][1] += + q_filt * sbr_noise_table[indexnoise][1]; + } + phi_sign = -phi_sign; + } + } else { + indexnoise = (indexnoise + m_max) & 0x1ff; + for (m = 0; m < m_max; m++) { + Y[1][i][m + kx][0] += + sbr->s_m[e][m] * phi[0][indexsine]; + Y[1][i][m + kx][1] += + sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign); + phi_sign = -phi_sign; + } + } + indexsine = (indexsine + 1) & 3; + } + } + ch_data->f_indexnoise = indexnoise; + ch_data->f_indexsine = indexsine; +} + +void ff_sbr_dequant(AACContext *ac, SpectralBandReplication *sbr, int id_aac) +{ + int ch; + + if (sbr->start) { + for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) { + sbr_time_freq_grid(ac, sbr, &sbr->data[ch], ch); + } + sbr_dequant(sbr, id_aac); + } +} + +void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int ch, + const float* in, float* out) +{ + int downsampled = ac->m4ac.ext_sample_rate < sbr->sample_rate; + + /* decode channel */ + sbr_qmf_analysis(&ac->dsp, &sbr->rdft, in, sbr->data[ch].analysis_filterbank_samples, + (float*)sbr->qmf_filter_scratch, + sbr->data[ch].W, ac->add_bias, 1/(-1024 * ac->sf_scale)); + sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W); + if (sbr->start) { + sbr_hf_inverse_filter(sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]); + sbr_chirp(sbr, &sbr->data[ch]); + sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1, + sbr->data[ch].bw_array, sbr->data[ch].t_env, + sbr->data[ch].bs_num_env[1]); + + // hf_adj + sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a); + sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]); + sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a); + sbr_hf_assemble(sbr->data[ch].Y, sbr->X_high, sbr, &sbr->data[ch], + sbr->data[ch].e_a); + } + + /* synthesis */ + sbr_x_gen(sbr, sbr->X, sbr->X_low, sbr->data[ch].Y, ch); + sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, out, sbr->X, sbr->qmf_filter_scratch, + sbr->data[ch].synthesis_filterbank_samples, + &sbr->data[ch].synthesis_filterbank_samples_offset, + downsampled, + ac->add_bias, -1024 * ac->sf_scale); +} |