static FFPsyWindowInfo psy_3gpp_window(FFPsyContext *ctx, const int16_t *audio, const int16_t *la, int channel, int prev_type) { int i, j; int br = ctx->avctx->bit_rate / ctx->avctx->channels; int attack_ratio = br <= 16000 ? 18 : 10; Psy3gppContext *pctx = (Psy3gppContext*) ctx->model_priv_data; Psy3gppChannel *pch = &pctx->ch[channel]; uint8_t grouping = 0; FFPsyWindowInfo wi; memset(&wi, 0, sizeof(wi)); if (la) { float s[8], v; int switch_to_eight = 0; float sum = 0.0, sum2 = 0.0; int attack_n = 0; for (i = 0; i < 8; i++) { for (j = 0; j < 128; j++) { v = iir_filter(la[(i*128+j)*ctx->avctx->channels], pch->iir_state); sum += v*v; } s[i] = sum; sum2 += sum; } for (i = 0; i < 8; i++) { if (s[i] > pch->win_energy * attack_ratio) { attack_n = i + 1; switch_to_eight = 1; break; } } pch->win_energy = pch->win_energy*7/8 + sum2/64; wi.window_type[1] = prev_type; switch (prev_type) { case ONLY_LONG_SEQUENCE: wi.window_type[0] = switch_to_eight ? LONG_START_SEQUENCE : ONLY_LONG_SEQUENCE; break; case LONG_START_SEQUENCE: wi.window_type[0] = EIGHT_SHORT_SEQUENCE; grouping = pch->next_grouping; break; case LONG_STOP_SEQUENCE: wi.window_type[0] = ONLY_LONG_SEQUENCE; break; case EIGHT_SHORT_SEQUENCE: wi.window_type[0] = switch_to_eight ? EIGHT_SHORT_SEQUENCE : LONG_STOP_SEQUENCE; grouping = switch_to_eight ? pch->next_grouping : 0; break; } pch->next_grouping = window_grouping[attack_n]; } else { for (i = 0; i < 3; i++) wi.window_type[i] = prev_type; grouping = (prev_type == EIGHT_SHORT_SEQUENCE) ? window_grouping[0] : 0; } wi.window_shape = 1; if (wi.window_type[0] != EIGHT_SHORT_SEQUENCE) { wi.num_windows = 1; wi.grouping[0] = 1; } else { int lastgrp = 0; wi.num_windows = 8; for (i = 0; i < 8; i++) { if (!((grouping >> i) & 1)) lastgrp = i; wi.grouping[lastgrp]++; } } return wi; }