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_pointer > ch_data->bs_num_env[1] + 1) { av_log(ac->avccontext, AV_LOG_ERROR, "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n", ch_data->bs_pointer); return -1; } 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; }