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| author | Lynne <dev@lynne.ee> | 2024-04-30 00:26:56 +0200 |
|---|---|---|
| committer | Lynne <dev@lynne.ee> | 2024-06-02 18:34:44 +0200 |
| commit | 7cd8a3f509507ebcdd87c8d1d497134a80742981 (patch) | |
| tree | 7f8eff0a2927710992bf9ccf8579984e0e7b8efb | |
| parent | 0513c5cd25ca7219939a3f4e022ae55b9443735f (diff) | |
| download | ffmpeg-7cd8a3f509507ebcdd87c8d1d497134a80742981.tar.gz | |
aactab: add deemphasis tables for USAC
| -rw-r--r-- | libavcodec/aactab.c | 25 | ||||
| -rw-r--r-- | libavcodec/aactab.h | 2 |
2 files changed, 27 insertions, 0 deletions
diff --git a/libavcodec/aactab.c b/libavcodec/aactab.c index 3718b81a07..8ce5e43974 100644 --- a/libavcodec/aactab.c +++ b/libavcodec/aactab.c @@ -3377,3 +3377,28 @@ const DECLARE_ALIGNED(32, int, ff_aac_eld_window_480_fixed)[1800] = { 0xffecff1c, 0xffed391e, 0xffed740c, 0xffedafb1, 0xffedebe1, 0xffee287d, 0xffee654e, 0xffeea23f, }; + +/* As specified by ISO/IEC 23003 */ +#define USAC_EMPH_COEFF 0.68 + +DECLARE_ALIGNED(16, const float, ff_aac_deemph_weights)[16] = { + USAC_EMPH_COEFF, + USAC_EMPH_COEFF*USAC_EMPH_COEFF, + USAC_EMPH_COEFF*USAC_EMPH_COEFF*USAC_EMPH_COEFF, + USAC_EMPH_COEFF*USAC_EMPH_COEFF*USAC_EMPH_COEFF*USAC_EMPH_COEFF, + + 0, + USAC_EMPH_COEFF, + USAC_EMPH_COEFF*USAC_EMPH_COEFF, + USAC_EMPH_COEFF*USAC_EMPH_COEFF*USAC_EMPH_COEFF, + + 0, + 0, + USAC_EMPH_COEFF, + USAC_EMPH_COEFF*USAC_EMPH_COEFF, + + 0, + 0, + 0, + USAC_EMPH_COEFF, +}; diff --git a/libavcodec/aactab.h b/libavcodec/aactab.h index e1a2d8b9a1..91262380d4 100644 --- a/libavcodec/aactab.h +++ b/libavcodec/aactab.h @@ -64,6 +64,8 @@ DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_480)[1800]; DECLARE_ALIGNED(32, extern const int, ff_aac_eld_window_480_fixed)[1800]; // @} +extern const float ff_aac_deemph_weights[16]; + /* Initializes data shared between float decoder and encoder. */ void ff_aac_float_common_init(void); |