virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2025-08-10 06:10:52 +02:00
Code Issues Releases Activity

aacenc: use generational cache instead of resetting.

Browse Source 
Approximately 11% faster transcoding from mp3 with
default settings.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Reimar Döffinger
2016-03-06 17:28:42 +01:00
parent b3e0371818
commit b91e376390
3 changed files with 9 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
libavcodec/aacenc.c
View File

@@ -78,11 +78,10 @@ static void put_audio_specific_config(AVCodecContext *avctx)
void ff_quantize_band_cost_cache_init(struct AACEncContext *s) void ff_quantize_band_cost_cache_init(struct AACEncContext *s)
{ {
int sf, g; ++s->quantize_band_cost_cache_generation;
for (sf = 0; sf < 256; sf++) { if (s->quantize_band_cost_cache_generation == 0) {
for (g = 0; g < 128; g++) { memset(s->quantize_band_cost_cache, 0, sizeof(s->quantize_band_cost_cache));
s->quantize_band_cost_cache[sf][g].bits = -1; s->quantize_band_cost_cache_generation = 1;
}
} }
} }

5
libavcodec/aacenc.h
View File

@@ -84,10 +84,10 @@ extern AACCoefficientsEncoder ff_aac_coders[];
typedef struct AACQuantizeBandCostCacheEntry { typedef struct AACQuantizeBandCostCacheEntry {
float rd; float rd;
float energy; float energy;
int bits; ///< -1 means uninitialized entry int bits;
char cb; char cb;
char rtz; char rtz;
char padding[2]; ///< Keeps the entry size a multiple of 32 bits uint16_t generation;
} AACQuantizeBandCostCacheEntry; } AACQuantizeBandCostCacheEntry;
/** /**
@@ -126,6 +126,7 @@ typedef struct AACEncContext {
DECLARE_ALIGNED(16, int, qcoefs)[96]; ///< quantized coefficients DECLARE_ALIGNED(16, int, qcoefs)[96]; ///< quantized coefficients
DECLARE_ALIGNED(32, float, scoefs)[1024]; ///< scaled coefficients DECLARE_ALIGNED(32, float, scoefs)[1024]; ///< scaled coefficients
uint16_t quantize_band_cost_cache_generation;
AACQuantizeBandCostCacheEntry quantize_band_cost_cache[256][128]; ///< memoization area for quantize_band_cost AACQuantizeBandCostCacheEntry quantize_band_cost_cache[256][128]; ///< memoization area for quantize_band_cost
struct { struct {

3
libavcodec/aacenc_quantization_misc.h
View File

@@ -36,11 +36,12 @@ static inline float quantize_band_cost_cached(struct AACEncContext *s, int w, in
AACQuantizeBandCostCacheEntry *entry; AACQuantizeBandCostCacheEntry *entry;
av_assert1(scale_idx >= 0 && scale_idx < 256); av_assert1(scale_idx >= 0 && scale_idx < 256);
entry = &s->quantize_band_cost_cache[scale_idx][w*16+g]; entry = &s->quantize_band_cost_cache[scale_idx][w*16+g];
if (entry->bits < 0 || entry->cb != cb || entry->rtz != rtz) { if (entry->generation != s->quantize_band_cost_cache_generation || entry->cb != cb || entry->rtz != rtz) {
entry->rd = quantize_band_cost(s, in, scaled, size, scale_idx, entry->rd = quantize_band_cost(s, in, scaled, size, scale_idx,
cb, lambda, uplim, &entry->bits, &entry->energy, rtz); cb, lambda, uplim, &entry->bits, &entry->energy, rtz);
entry->cb = cb; entry->cb = cb;
entry->rtz = rtz; entry->rtz = rtz;
entry->generation = s->quantize_band_cost_cache_generation;
} }
if (bits) if (bits)
*bits = entry->bits; *bits = entry->bits;