-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];
-
- if (sbr->sample_rate < 32000) {
- temp = 3000;
- } else if (sbr->sample_rate < 64000) {
- temp = 4000;
- } else
- temp = 5000;
-
- 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;
- }
-
- 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);
- 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->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 (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->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);
-
- 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->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];
- 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->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;
-
- 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];
-
- 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->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;
-
- 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 (ch_data->bs_frame_class = get_bits(gb, 2)) {
- case FIXFIX:
- ch_data->bs_num_env = 1 << get_bits(gb, 2);
- num_rel_lead = ch_data->bs_num_env - 1;
- if (ch_data->bs_num_env == 1)
- ch_data->bs_amp_res = 0;
-
- if (ch_data->bs_num_env > 4) {
- av_log(ac->avctx, AV_LOG_ERROR,
- "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
- ch_data->bs_num_env);
- return -1;
- }
-
- 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);
- ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
-
- if (ch_data->bs_num_env > 5) {
- av_log(ac->avctx, AV_LOG_ERROR,
- "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
- ch_data->bs_num_env);
- return -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;
- 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;
- }
-
- 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, "Non 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 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; 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[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],
- 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)
-{
- 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 {
-#if 1
- *num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left);
- ac->avctx->profile = FF_PROFILE_AAC_HE_V2;
-#else
- avpriv_report_missing_feature(ac->avctx, "Parametric Stereo");
- skip_bits_long(gb, *num_bits_left); // bs_fill_bits
- *num_bits_left = 0;
-#endif
- }
- 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)
-{
- 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]);
- 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]);
-
- return 0;
-}
-
-static int 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))) {
- 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]));
- 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 {
- 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]);
- 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]);
-
- 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;
-
- 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 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);
- }
- return cnt;
-}
-