diff options
Diffstat (limited to 'include/lc3_private.h')
| -rw-r--r-- | include/lc3_private.h | 68 |
1 files changed, 46 insertions, 22 deletions
diff --git a/include/lc3_private.h b/include/lc3_private.h index c4d6703..4f5f657 100644 --- a/include/lc3_private.h +++ b/include/lc3_private.h @@ -24,39 +24,50 @@ /** - * Return number of samples, delayed samples and - * encoded spectrum coefficients within a frame - * - For encoding, keep 1.25 ms of temporal winodw - * - For decoding, keep 18 ms of history, aligned on frames, and a frame + * Characteristics + * + * - The number of samples within a frame + * + * - The number of MDCT delayed samples, sum of half a frame and + * an ovelap of future by 1.25 ms (2.5ms, 5ms and 10ms frame durations) + * or 2 ms (7.5ms frame duration). + * + * - For decoding, keep 18 ms of history, aligned on a frame + * + * - For encoding, keep 1.25 ms of temporal previous samples */ -#define __LC3_NS(dt_us, sr_hz) \ - ( (dt_us * sr_hz) / 1000 / 1000 ) +#define LC3_NS(dt_us, sr_hz) \ + ( (dt_us) * (sr_hz) / 1000 / 1000 ) -#define __LC3_ND(dt_us, sr_hz) \ - ( (dt_us) == 7500 ? 23 * __LC3_NS(dt_us, sr_hz) / 30 \ - : 5 * __LC3_NS(dt_us, sr_hz) / 8 ) +#define LC3_ND(dt_us, sr_hz) \ + ( LC3_NS(dt_us, sr_hz) / 2 + \ + LC3_NS((dt_us) == 7500 ? 2000 : 1250, sr_hz) ) -#define __LC3_NT(sr_hz) \ - ( (5 * sr_hz) / 4000 ) +#define LC3_NH(dt_us, sr_hz) \ + ( (sr_hz) > 48000 ? 0 : ( LC3_NS(18000, sr_hz) + \ + LC3_NS(dt_us, sr_hz) - (LC3_NS(18000, sr_hz) % LC3_NS(dt_us, sr_hz)) ) ) -#define __LC3_NH(dt_us, sr_hz) \ - ( ((3 - ((dt_us) >= 10000)) + 1) * __LC3_NS(dt_us, sr_hz) ) +#define LC3_NT(sr_hz) \ + ( LC3_NS(1250, sr_hz) ) /** - * Frame duration 7.5ms or 10ms + * Frame duration */ enum lc3_dt { - LC3_DT_7M5, - LC3_DT_10M, + LC3_DT_2M5 = 0, + LC3_DT_5M = 1, + LC3_DT_7M5 = 2, + LC3_DT_10M = 3, LC3_NUM_DT }; + /** - * Sampling frequency + * Sampling frequency and high-resolution mode */ enum lc3_srate { @@ -65,8 +76,10 @@ enum lc3_srate { LC3_SRATE_24K, LC3_SRATE_32K, LC3_SRATE_48K, + LC3_SRATE_48K_HR, + LC3_SRATE_96K_HR, - LC3_NUM_SRATE, + LC3_NUM_SRATE }; @@ -112,8 +125,8 @@ struct lc3_encoder { }; #define LC3_ENCODER_BUFFER_COUNT(dt_us, sr_hz) \ - ( ( __LC3_NS(dt_us, sr_hz) + __LC3_NT(sr_hz) ) / 2 + \ - __LC3_NS(dt_us, sr_hz) + __LC3_ND(dt_us, sr_hz) ) + ( ( LC3_NS(dt_us, sr_hz) + LC3_NT(sr_hz) ) / 2 + \ + LC3_NS(dt_us, sr_hz) + LC3_ND(dt_us, sr_hz) ) #define LC3_ENCODER_MEM_T(dt_us, sr_hz) \ struct { \ @@ -150,8 +163,8 @@ struct lc3_decoder { }; #define LC3_DECODER_BUFFER_COUNT(dt_us, sr_hz) \ - ( __LC3_NH(dt_us, sr_hz) + __LC3_ND(dt_us, sr_hz) + \ - __LC3_NS(dt_us, sr_hz) ) + ( LC3_NH(dt_us, sr_hz) + LC3_NS(dt_us, sr_hz) + \ + LC3_ND(dt_us, sr_hz) + LC3_NS(dt_us, sr_hz) ) #define LC3_DECODER_MEM_T(dt_us, sr_hz) \ struct { \ @@ -160,4 +173,15 @@ struct lc3_decoder { } +/** + * Change the visibility of interface functions + */ + +#ifdef _WIN32 +#define LC3_EXPORT __declspec(dllexport) +#else +#define LC3_EXPORT __attribute__((visibility ("default"))) +#endif + + #endif /* __LC3_PRIVATE_H */ |