diff options
Diffstat (limited to 'libavcodec/aaccoder.c')
| -rw-r--r-- | libavcodec/aaccoder.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/libavcodec/aaccoder.c b/libavcodec/aaccoder.c index 2f99924821..cd996b2430 100644 --- a/libavcodec/aaccoder.c +++ b/libavcodec/aaccoder.c @@ -595,6 +595,43 @@ typedef struct TrellisPath { #define TRELLIS_STAGES 121 #define TRELLIS_STATES (SCALE_MAX_DIFF+1) +static void set_special_band_scalefactors(AACEncContext *s, SingleChannelElement *sce) +{ + int w, g, start = 0; + int minscaler_n = sce->sf_idx[0], minscaler_i = sce->sf_idx[0]; + int bands = 0; + + for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { + start = 0; + for (g = 0; g < sce->ics.num_swb; g++) { + if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) { + sce->sf_idx[w*16+g] = av_clip(ceilf(log2f(sce->is_ener[w*16+g])*2), -155, 100); + minscaler_i = FFMIN(minscaler_i, sce->sf_idx[w*16+g]); + bands++; + } else if (sce->band_type[w*16+g] == NOISE_BT) { + sce->sf_idx[w*16+g] = av_clip(4+log2f(sce->pns_ener[w*16+g])*2, -100, 155); + minscaler_n = FFMIN(minscaler_n, sce->sf_idx[w*16+g]); + bands++; + } + start += sce->ics.swb_sizes[g]; + } + } + + if (!bands) + return; + + /* Clip the scalefactor indices */ + for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) { + for (g = 0; g < sce->ics.num_swb; g++) { + if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) { + sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler_i, minscaler_i + SCALE_MAX_DIFF); + } else if (sce->band_type[w*16+g] == NOISE_BT) { + sce->sf_idx[w*16+g] = av_clip(sce->sf_idx[w*16+g], minscaler_n, minscaler_n + SCALE_MAX_DIFF); + } + } + } +} + static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce, const float lambda) |