/* * AAC Spectral Band Replication decoding functions * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl ) * Copyright (c) 2009-2010 Alex Converse * * Fixed point code * Copyright (c) 2013 * MIPS Technologies, Inc., California. * * 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 * AAC Spectral Band Replication decoding functions * @author Robert Swain ( rob opendot cl ) * @author Stanislav Ocovaj ( stanislav.ocovaj@imgtec.com ) * @author Zoran Basaric ( zoran.basaric@imgtec.com ) */ #include "libavutil/qsort.h" static av_cold void aacsbr_tableinit(void) { int n; for (n = 0; n < 320; n++) sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n]; } av_cold void AAC_RENAME(ff_aac_sbr_init)(void) { 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); aacsbr_tableinit(); AAC_RENAME(ff_ps_init)(); } /** Places SBR in pure upsampling mode. */ static void sbr_turnoff(SpectralBandReplication *sbr) { sbr->start = 0; sbr->ready_for_dequant = 0; // Init defults used in pure upsampling mode sbr->kx[1] = 32; //Typo in spec, kx' inits to 32 sbr->m[1] = 0; // Reset values for first SBR header sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1; memset(&sbr->spectrum_params, -1, sizeof(SpectrumParameters)); } av_cold int AAC_RENAME(ff_aac_sbr_ctx_init)(AACContext *ac, SpectralBandReplication *sbr, int id_aac) { int ret; float scale; if (sbr->mdct) return 0; sbr->kx[0] = sbr->kx[1]; sbr->id_aac = id_aac; sbr_turnoff(sbr); 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); /* SBR requires samples to be scaled to +/-32768.0 to work correctly. * mdct scale factors are adjusted to scale up from +/-1.0 at analysis * and scale back down at synthesis. */ scale = USE_FIXED ? 1 : 1.0 / (64 * 32768); ret = av_tx_init(&sbr->mdct, &sbr->mdct_fn, USE_FIXED ? AV_TX_INT32_MDCT : AV_TX_FLOAT_MDCT, 1, 64, &scale, 0); if (ret < 0) return ret; scale = USE_FIXED ? -1.0 : -2.0 * 32768; ret = av_tx_init(&sbr->mdct_ana, &sbr->mdct_ana_fn, USE_FIXED ? AV_TX_INT32_MDCT : AV_TX_FLOAT_MDCT, 1, 64, &scale, 0); if (ret < 0) return ret; AAC_RENAME(ff_ps_ctx_init)(&sbr->ps); AAC_RENAME(ff_sbrdsp_init)(&sbr->dsp); aacsbr_func_ptr_init(&sbr->c); return 0; } av_cold void AAC_RENAME(ff_aac_sbr_ctx_close)(SpectralBandReplication *sbr) { av_tx_uninit(&sbr->mdct); av_tx_uninit(&sbr->mdct_ana); } 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 INTFLOAT bands_warped[3] = { Q23(1.32715174233856803909f), //2^(0.49/1.2) Q23(1.18509277094158210129f), //2^(0.49/2) Q23(1.11987160404675912501f) }; //2^(0.49/3) const INTFLOAT lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1]; int16_t patch_borders[7]; 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])); AV_QSORT(sbr->f_tablelim, sbr->num_patches + sbr->n[0], uint16_t, qsort_comparison_function_int16); sbr->n_lim = sbr->n[0] + sbr->num_patches - 1; while (out < sbr->f_tablelim + sbr->n_lim) { #if USE_FIXED if ((*in << 23) >= *out * lim_bands_per_octave_warped) { #else if (*in >= *out * lim_bands_per_octave_warped) { #endif /* USE_FIXED */ *++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; sbr->ready_for_dequant = 0; // 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 int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band) { // Requirements (14496-3 sp04 p205) if (n_master <= 0) { av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master); return -1; } if (bs_xover_band >= n_master) { av_log(avctx, 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 = 0; unsigned int start_min, stop_min; int k; const int8_t *sbr_offset_ptr; int16_t stop_dk[13]; 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->avctx, AV_LOG_ERROR, "Unsupported sample rate for SBR: %d\n", sbr->sample_rate); return -1; } 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; 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); AV_QSORT(stop_dk, 13, int16_t, 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->avctx, 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; else av_assert0(0); if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) { av_log(ac->avctx, AV_LOG_ERROR, "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]); return -1; } if (!spectrum->bs_freq_scale) { int dk, 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->avctx, 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 USE_FIXED int tmp, nz = 0; #endif /* USE_FIXED */ 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]; } #if USE_FIXED tmp = (sbr->k[1] << 23) / sbr->k[0]; while (tmp < 0x40000000) { tmp <<= 1; nz++; } tmp = fixed_log(tmp - 0x80000000); tmp = (int)(((int64_t)tmp * CONST_RECIP_LN2 + 0x20000000) >> 30); tmp = (((tmp + 0x80) >> 8) + ((8 - nz) << 23)) * half_bands; num_bands_0 = ((tmp + 0x400000) >> 23) * 2; #else num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2; #endif /* USE_FIXED */ if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205) av_log(ac->avctx, 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); AV_QSORT(vk0 + 1, num_bands_0, int16_t, 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->avctx, 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]; #if USE_FIXED int num_bands_1; tmp = (sbr->k[2] << 23) / sbr->k[1]; nz = 0; while (tmp < 0x40000000) { tmp <<= 1; nz++; } tmp = fixed_log(tmp - 0x80000000); tmp = (int)(((int64_t)tmp * CONST_RECIP_LN2 + 0x20000000) >> 30); tmp = (((tmp + 0x80) >> 8) + ((8 - nz) << 23)) * half_bands; if (spectrum->bs_alter_scale) tmp = (int)(((int64_t)tmp * CONST_076923 + 0x40000000) >> 31); num_bands_1 = ((tmp + 0x400000) >> 23) * 2; #else 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; #endif /* USE_FIXED */ 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; AV_QSORT(vk1 + 1, num_bands_1, int16_t, 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; } AV_QSORT(vk1 + 1, num_bands_1, int16_t, 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->avctx, 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->avctx, 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->avctx, 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, last_k = -1, last_msb = -1, 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; if (k == last_k && msb == last_msb) { av_log(ac->avctx, AV_LOG_ERROR, "patch construction failed\n"); return AVERROR_INVALIDDATA; } last_k = k; last_msb = msb; for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) { sb = sbr->f_master[i]; odd = (sb + sbr->k[0]) & 1; } // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5. // After this check the final number of patches can still be six which is // illegal however the Coding Technologies decoder check stream has a final // count of 6 patches if (sbr->num_patches > 5) { av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches); return -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->num_patches > 1 && sbr->patch_num_subbands[sbr->num_patches - 1] < 3) sbr->num_patches--; return 0; } /// Derived Frequency Band Tables (14496-3 sp04 p197) static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr) { int k, temp; #if USE_FIXED int nz = 0; #endif /* USE_FIXED */ 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->avctx, 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->avctx, 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]; #if USE_FIXED temp = (sbr->k[2] << 23) / sbr->kx[1]; while (temp < 0x40000000) { temp <<= 1; nz++; } temp = fixed_log(temp - 0x80000000); temp = (int)(((int64_t)temp * CONST_RECIP_LN2 + 0x20000000) >> 30); temp = (((temp + 0x80) >> 8) + ((8 - nz) << 23)) * sbr->spectrum_params.bs_noise_bands; sbr->n_q = (temp + 0x400000) >> 23; if (sbr->n_q < 1) sbr->n_q = 1; #else 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 #endif /* USE_FIXED */ if (sbr->n_q > 5) { av_log(ac->avctx, 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; int bs_pointer = 0; // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots int abs_bord_trail = 16; int num_rel_lead, num_rel_trail; unsigned bs_num_env_old = ch_data->bs_num_env; int bs_frame_class, bs_num_env; ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env]; ch_data->bs_amp_res = sbr->bs_amp_res_header; ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old]; switch (bs_frame_class = get_bits(gb, 2)) { case FIXFIX: bs_num_env = 1 << get_bits(gb, 2); if (bs_num_env > 4) { av_log(ac->avctx, AV_LOG_ERROR, "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n", bs_num_env); return -1; } ch_data->bs_num_env = bs_num_env; num_rel_lead = ch_data->bs_num_env - 1; if (ch_data->bs_num_env == 1) ch_data->bs_amp_res = 0; ch_data->t_env[0] = 0; ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) / ch_data->bs_num_env; for (i = 0; i < num_rel_lead; i++) ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail; ch_data->bs_freq_res[1] = get_bits1(gb); for (i = 1; i < ch_data->bs_num_env; i++) ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1]; break; case FIXVAR: abs_bord_trail += get_bits(gb, 2); num_rel_trail = get_bits(gb, 2); ch_data->bs_num_env = num_rel_trail + 1; ch_data->t_env[0] = 0; ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; for (i = 0; i < num_rel_trail; i++) ch_data->t_env[ch_data->bs_num_env - 1 - i] = ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2; bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]); for (i = 0; i < ch_data->bs_num_env; i++) ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb); break; case VARFIX: ch_data->t_env[0] = get_bits(gb, 2); num_rel_lead = get_bits(gb, 2); ch_data->bs_num_env = num_rel_lead + 1; ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; for (i = 0; i < num_rel_lead; i++) ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2; bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]); get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env); break; case VARVAR: ch_data->t_env[0] = get_bits(gb, 2); abs_bord_trail += get_bits(gb, 2); num_rel_lead = get_bits(gb, 2); num_rel_trail = get_bits(gb, 2); bs_num_env = num_rel_lead + num_rel_trail + 1; if (bs_num_env > 5) { av_log(ac->avctx, AV_LOG_ERROR, "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n", bs_num_env); return -1; } ch_data->bs_num_env = bs_num_env; ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; for (i = 0; i < num_rel_lead; i++) ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2; for (i = 0; i < num_rel_trail; i++) ch_data->t_env[ch_data->bs_num_env - 1 - i] = ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2; bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]); get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env); break; } ch_data->bs_frame_class = bs_frame_class; av_assert0(bs_pointer >= 0); if (bs_pointer > ch_data->bs_num_env + 1) { av_log(ac->avctx, AV_LOG_ERROR, "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n", bs_pointer); return -1; } for (i = 1; i <= ch_data->bs_num_env; i++) { if (ch_data->t_env[i-1] >= ch_data->t_env[i]) { av_log(ac->avctx, AV_LOG_ERROR, "Not strictly monotone time borders\n"); return -1; } } ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1; ch_data->t_q[0] = ch_data->t_env[0]; ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env]; if (ch_data->bs_num_noise > 1) { int idx; if (ch_data->bs_frame_class == FIXFIX) { idx = ch_data->bs_num_env >> 1; } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR idx = ch_data->bs_num_env - FFMAX(bs_pointer - 1, 1); } else { // VARFIX if (!bs_pointer) idx = 1; else if (bs_pointer == 1) idx = ch_data->bs_num_env - 1; else // bs_pointer > 1 idx = bs_pointer - 1; } ch_data->t_q[1] = ch_data->t_env[idx]; } ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev ch_data->e_a[1] = -1; if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0 ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer; } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1 ch_data->e_a[1] = bs_pointer - 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]; dst->t_env_num_env_old = dst->t_env[dst->bs_num_env]; dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env); //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->t_env, src->t_env, sizeof(dst->t_env)); memcpy(dst->t_q, src->t_q, sizeof(dst->t_q)); dst->bs_num_env = src->bs_num_env; dst->bs_amp_res = src->bs_amp_res; dst->bs_num_noise = src->bs_num_noise; dst->bs_frame_class = src->bs_frame_class; dst->e_a[1] = src->e_a[1]; } /// 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); 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 int read_sbr_envelope(AACContext *ac, SpectralBandReplication *sbr, GetBitContext *gb, SBRData *ch_data, int ch) { int bits; int i, j, k; const VLCElem *t_huff, *f_huff; 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; i++) { if (ch_data->bs_df_env[i]) { // bs_freq_res[0] == bs_freq_res[bs_num_env] 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_q[i + 1][j] = ch_data->env_facs_q[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav); if (ch_data->env_facs_q[i + 1][j] > 127U) { av_log(ac->avctx, AV_LOG_ERROR, "env_facs_q %d is invalid\n", ch_data->env_facs_q[i + 1][j]); return AVERROR_INVALIDDATA; } } } 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_q[i + 1][j] = ch_data->env_facs_q[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav); if (ch_data->env_facs_q[i + 1][j] > 127U) { av_log(ac->avctx, AV_LOG_ERROR, "env_facs_q %d is invalid\n", ch_data->env_facs_q[i + 1][j]); return AVERROR_INVALIDDATA; } } } 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_q[i + 1][j] = ch_data->env_facs_q[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav); if (ch_data->env_facs_q[i + 1][j] > 127U) { av_log(ac->avctx, AV_LOG_ERROR, "env_facs_q %d is invalid\n", ch_data->env_facs_q[i + 1][j]); return AVERROR_INVALIDDATA; } } } } else { ch_data->env_facs_q[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_q[i + 1][j] = ch_data->env_facs_q[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav); if (ch_data->env_facs_q[i + 1][j] > 127U) { av_log(ac->avctx, AV_LOG_ERROR, "env_facs_q %d is invalid\n", ch_data->env_facs_q[i + 1][j]); return AVERROR_INVALIDDATA; } } } } //assign 0th elements of env_facs_q from last elements memcpy(ch_data->env_facs_q[0], ch_data->env_facs_q[ch_data->bs_num_env], sizeof(ch_data->env_facs_q[0])); return 0; } static int read_sbr_noise(AACContext *ac, SpectralBandReplication *sbr, GetBitContext *gb, SBRData *ch_data, int ch) { int i, j; const VLCElem *t_huff, *f_huff; 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_q[i + 1][j] = ch_data->noise_facs_q[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav); if (ch_data->noise_facs_q[i + 1][j] > 30U) { av_log(ac->avctx, AV_LOG_ERROR, "noise_facs_q %d is invalid\n", ch_data->noise_facs_q[i + 1][j]); return AVERROR_INVALIDDATA; } } } else { ch_data->noise_facs_q[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_q[i + 1][j] = ch_data->noise_facs_q[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav); if (ch_data->noise_facs_q[i + 1][j] > 30U) { av_log(ac->avctx, AV_LOG_ERROR, "noise_facs_q %d is invalid\n", ch_data->noise_facs_q[i + 1][j]); return AVERROR_INVALIDDATA; } } } } //assign 0th elements of noise_facs_q from last elements memcpy(ch_data->noise_facs_q[0], ch_data->noise_facs_q[ch_data->bs_num_noise], sizeof(ch_data->noise_facs_q[0])); return 0; } static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr, GetBitContext *gb, int bs_extension_id, int *num_bits_left) { switch (bs_extension_id) { case EXTENSION_ID_PS: if (!ac->oc[1].m4ac.ps) { av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n"); skip_bits_long(gb, *num_bits_left); // bs_fill_bits *num_bits_left = 0; } else { *num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps.common, *num_bits_left); ac->avctx->profile = FF_PROFILE_AAC_HE_V2; // ensure the warning is not printed if PS extension is present ac->warned_he_aac_mono = 1; } break; default: // some files contain 0-padding if (bs_extension_id || *num_bits_left > 16 || show_bits(gb, *num_bits_left)) avpriv_request_sample(ac->avctx, "Reserved SBR extensions"); skip_bits_long(gb, *num_bits_left); // bs_fill_bits *num_bits_left = 0; break; } } static int read_sbr_single_channel_element(AACContext *ac, SpectralBandReplication *sbr, GetBitContext *gb) { int ret; if (get_bits1(gb)) // bs_data_extra skip_bits(gb, 4); // bs_reserved if (read_sbr_grid(ac, sbr, gb, &sbr->data[0])) return -1; read_sbr_dtdf(sbr, gb, &sbr->data[0]); read_sbr_invf(sbr, gb, &sbr->data[0]); if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[0], 0)) < 0) return ret; if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[0], 0)) < 0) return ret; if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb))) get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]); return 0; } static int read_sbr_channel_pair_element(AACContext *ac, SpectralBandReplication *sbr, GetBitContext *gb) { int ret; if (get_bits1(gb)) // bs_data_extra skip_bits(gb, 8); // bs_reserved if ((sbr->bs_coupling = get_bits1(gb))) { if (read_sbr_grid(ac, sbr, gb, &sbr->data[0])) return -1; 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])); if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[0], 0)) < 0) return ret; if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[0], 0)) < 0) return ret; if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[1], 1)) < 0) return ret; if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[1], 1)) < 0) return ret; } else { if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) || read_sbr_grid(ac, sbr, gb, &sbr->data[1])) return -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]); if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[0], 0)) < 0) return ret; if((ret = read_sbr_envelope(ac, sbr, gb, &sbr->data[1], 1)) < 0) return ret; if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[0], 0)) < 0) return ret; if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[1], 1)) < 0) return ret; } 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]); return 0; } static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr, GetBitContext *gb, int id_aac) { unsigned int cnt = get_bits_count(gb); sbr->id_aac = id_aac; sbr->ready_for_dequant = 1; if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) { if (read_sbr_single_channel_element(ac, sbr, gb)) { sbr_turnoff(sbr); return get_bits_count(gb) - cnt; } } else if (id_aac == TYPE_CPE) { if (read_sbr_channel_pair_element(ac, sbr, gb)) { sbr_turnoff(sbr); return get_bits_count(gb) - cnt; } } else { av_log(ac->avctx, AV_LOG_ERROR, "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac); sbr_turnoff(sbr); 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 } if (num_bits_left < 0) { av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n"); } if (num_bits_left > 0) skip_bits(gb, num_bits_left); } 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->avctx, AV_LOG_ERROR, "SBR reset failed. Switching SBR to pure upsampling mode.\n"); sbr_turnoff(sbr); } } /** * 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 AAC_RENAME(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->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support if (!ac->oc[1].m4ac.ext_sample_rate) ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].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]; sbr->kx_and_m_pushed = 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->avctx, AV_LOG_ERROR, "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read); sbr_turnoff(sbr); } return cnt; } /** * 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 */ #ifndef sbr_qmf_analysis #if USE_FIXED static void sbr_qmf_analysis(AVFixedDSPContext *dsp, AVTXContext *mdct, av_tx_fn mdct_fn, #else static void sbr_qmf_analysis(AVFloatDSPContext *dsp, AVTXContext *mdct, av_tx_fn mdct_fn, #endif /* USE_FIXED */ SBRDSPContext *sbrdsp, const INTFLOAT *in, INTFLOAT *x, INTFLOAT z[320], INTFLOAT W[2][32][32][2], int buf_idx) { int i; #if USE_FIXED int j; #endif memcpy(x , x+1024, (320-32)*sizeof(x[0])); memcpy(x+288, in, 1024*sizeof(x[0])); for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames // are not supported dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320); sbrdsp->sum64x5(z); sbrdsp->qmf_pre_shuffle(z); #if USE_FIXED for (j = 64; j < 128; j++) { if (z[j] > 1<<24) { av_log(NULL, AV_LOG_WARNING, "sbr_qmf_analysis: value %09d too large, setting to %09d\n", z[j], 1<<24); z[j] = 1<<24; } else if (z[j] < -(1<<24)) { av_log(NULL, AV_LOG_WARNING, "sbr_qmf_analysis: value %09d too small, setting to %09d\n", z[j], -(1<<24)); z[j] = -(1<<24); } } #endif mdct_fn(mdct, z, z + 64, sizeof(INTFLOAT)); sbrdsp->qmf_post_shuffle(W[buf_idx][i], z); x += 32; } } #endif /** * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank * (14496-3 sp04 p206) */ #ifndef sbr_qmf_synthesis static void sbr_qmf_synthesis(AVTXContext *mdct, av_tx_fn mdct_fn, #if USE_FIXED SBRDSPContext *sbrdsp, AVFixedDSPContext *dsp, #else SBRDSPContext *sbrdsp, AVFloatDSPContext *dsp, #endif /* USE_FIXED */ INTFLOAT *out, INTFLOAT X[2][38][64], INTFLOAT mdct_buf[2][64], INTFLOAT *v0, int *v_off, const unsigned int div) { int i, n; const INTFLOAT *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us; const int step = 128 >> div; INTFLOAT *v; for (i = 0; i < 32; i++) { if (*v_off < step) { int saved_samples = (1280 - 128) >> div; memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(INTFLOAT)); *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step; } else { *v_off -= step; } v = v0 + *v_off; if (div) { for (n = 0; n < 32; n++) { X[0][i][ n] = -X[0][i][n]; X[0][i][32+n] = X[1][i][31-n]; } mdct_fn(mdct, mdct_buf[0], X[0][i], sizeof(INTFLOAT)); sbrdsp->qmf_deint_neg(v, mdct_buf[0]); } else { sbrdsp->neg_odd_64(X[1][i]); mdct_fn(mdct, mdct_buf[0], X[0][i], sizeof(INTFLOAT)); mdct_fn(mdct, mdct_buf[1], X[1][i], sizeof(INTFLOAT)); sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]); } dsp->vector_fmul (out, v , sbr_qmf_window , 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); out += 64 >> div; } } #endif /// Generate the subband filtered lowband static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr, INTFLOAT X_low[32][40][2], const INTFLOAT W[2][32][32][2], int buf_idx) { 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[buf_idx][i - t_HFGen][k][0]; X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1]; } } buf_idx = 1-buf_idx; for (k = 0; k < sbr->kx[0]; k++) { for (i = 0; i < t_HFGen; i++) { X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0]; X_low[k][i][1] = W[buf_idx][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, INTFLOAT X_high[64][40][2], const INTFLOAT X_low[32][40][2], const INTFLOAT (*alpha0)[2], const INTFLOAT (*alpha1)[2], const INTFLOAT bw_array[5], const uint8_t *t_env, int bs_num_env) { int 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++) { 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->avctx, AV_LOG_ERROR, "ERROR : no subband found for frequency %d\n", k); return -1; } sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET, X_low[p] + ENVELOPE_ADJUSTMENT_OFFSET, alpha0[p], alpha1[p], bw_array[g], 2 * t_env[0], 2 * t_env[bs_num_env]); } } 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, INTFLOAT X[2][38][64], const INTFLOAT Y0[38][64][2], const INTFLOAT Y1[38][64][2], const INTFLOAT X_low[32][40][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] = Y0[i + i_f][k][0]; X[1][i][k] = Y0[i + i_f][k][1]; } } for (k = 0; k < sbr->kx[1]; k++) { for (i = i_Temp; i < 38; 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] = Y1[i][k][0]; X[1][i][k] = Y1[i][k][1]; } } return 0; } /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping * (14496-3 sp04 p217) */ static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr, SBRData *ch_data, int e_a[2]) { int e, i, m; memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1])); for (e = 0; e < ch_data->bs_num_env; 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; if (sbr->kx[1] != table[0]) { av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. " "Derived frequency tables were not regenerated.\n"); sbr_turnoff(sbr); return AVERROR_BUG; } 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], sizeof(ch_data->s_indexmapped[0])); return 0; } /// Estimation of current envelope (14496-3 sp04 p218) static void sbr_env_estimate(AAC_FLOAT (*e_curr)[48], INTFLOAT X_high[64][40][2], SpectralBandReplication *sbr, SBRData *ch_data) { int e, m; int kx1 = sbr->kx[1]; if (sbr->bs_interpol_freq) { for (e = 0; e < ch_data->bs_num_env; e++) { #if USE_FIXED const SoftFloat recip_env_size = av_int2sf(0x20000000 / (ch_data->t_env[e + 1] - ch_data->t_env[e]), 30); #else const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]); #endif /* USE_FIXED */ 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++) { AAC_FLOAT sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb); #if USE_FIXED e_curr[e][m] = av_mul_sf(sum, recip_env_size); #else e_curr[e][m] = sum * recip_env_size; #endif /* USE_FIXED */ } } } else { int k, p; for (e = 0; e < ch_data->bs_num_env; 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++) { #if USE_FIXED SoftFloat sum = FLOAT_0; const SoftFloat den = av_int2sf(0x20000000 / (env_size * (table[p + 1] - table[p])), 29); for (k = table[p]; k < table[p + 1]; k++) { sum = av_add_sf(sum, sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb)); } sum = av_mul_sf(sum, den); #else float sum = 0.0f; const int den = env_size * (table[p + 1] - table[p]); for (k = table[p]; k < table[p + 1]; k++) { sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb); } sum /= den; #endif /* USE_FIXED */ for (k = table[p]; k < table[p + 1]; k++) { e_curr[e][k - kx1] = sum; } } } } } void AAC_RENAME(ff_sbr_apply)(AACContext *ac, SpectralBandReplication *sbr, int id_aac, INTFLOAT* L, INTFLOAT* R) { int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate; int ch; int nch = (id_aac == TYPE_CPE) ? 2 : 1; int err; if (id_aac != sbr->id_aac) { av_log(ac->avctx, id_aac == TYPE_LFE ? AV_LOG_VERBOSE : AV_LOG_WARNING, "element type mismatch %d != %d\n", id_aac, sbr->id_aac); sbr_turnoff(sbr); } if (sbr->start && !sbr->ready_for_dequant) { av_log(ac->avctx, AV_LOG_ERROR, "No quantized data read for sbr_dequant.\n"); sbr_turnoff(sbr); } if (!sbr->kx_and_m_pushed) { sbr->kx[0] = sbr->kx[1]; sbr->m[0] = sbr->m[1]; } else { sbr->kx_and_m_pushed = 0; } if (sbr->start) { sbr_dequant(sbr, id_aac); sbr->ready_for_dequant = 0; } for (ch = 0; ch < nch; ch++) { /* decode channel */ sbr_qmf_analysis(ac->fdsp, sbr->mdct_ana, sbr->mdct_ana_fn, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples, (INTFLOAT*)sbr->qmf_filter_scratch, sbr->data[ch].W, sbr->data[ch].Ypos); sbr->c.sbr_lf_gen(ac, sbr, sbr->X_low, (const INTFLOAT (*)[32][32][2]) sbr->data[ch].W, sbr->data[ch].Ypos); sbr->data[ch].Ypos ^= 1; if (sbr->start) { sbr->c.sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1, (const INTFLOAT (*)[40][2]) sbr->X_low, sbr->k[0]); sbr_chirp(sbr, &sbr->data[ch]); av_assert0(sbr->data[ch].bs_num_env > 0); sbr_hf_gen(ac, sbr, sbr->X_high, (const INTFLOAT (*)[40][2]) sbr->X_low, (const INTFLOAT (*)[2]) sbr->alpha0, (const INTFLOAT (*)[2]) sbr->alpha1, sbr->data[ch].bw_array, sbr->data[ch].t_env, sbr->data[ch].bs_num_env); // hf_adj err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a); if (!err) { 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->c.sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos], (const INTFLOAT (*)[40][2]) sbr->X_high, sbr, &sbr->data[ch], sbr->data[ch].e_a); } } /* synthesis */ sbr->c.sbr_x_gen(sbr, sbr->X[ch], (const INTFLOAT (*)[64][2]) sbr->data[ch].Y[1-sbr->data[ch].Ypos], (const INTFLOAT (*)[64][2]) sbr->data[ch].Y[ sbr->data[ch].Ypos], (const INTFLOAT (*)[40][2]) sbr->X_low, ch); } if (ac->oc[1].m4ac.ps == 1) { if (sbr->ps.common.start) { AAC_RENAME(ff_ps_apply)(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]); } else { memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0])); } nch = 2; } sbr_qmf_synthesis(sbr->mdct, sbr->mdct_fn, &sbr->dsp, ac->fdsp, L, sbr->X[0], sbr->qmf_filter_scratch, sbr->data[0].synthesis_filterbank_samples, &sbr->data[0].synthesis_filterbank_samples_offset, downsampled); if (nch == 2) sbr_qmf_synthesis(sbr->mdct, sbr->mdct_fn, &sbr->dsp, ac->fdsp, R, sbr->X[1], sbr->qmf_filter_scratch, sbr->data[1].synthesis_filterbank_samples, &sbr->data[1].synthesis_filterbank_samples_offset, downsampled); } static void aacsbr_func_ptr_init(AACSBRContext *c) { c->sbr_lf_gen = sbr_lf_gen; c->sbr_hf_assemble = sbr_hf_assemble; c->sbr_x_gen = sbr_x_gen; c->sbr_hf_inverse_filter = sbr_hf_inverse_filter; #if !USE_FIXED #if ARCH_MIPS ff_aacsbr_func_ptr_init_mips(c); #endif #endif }