diff options
Diffstat (limited to 'libAACdec/src/aacdec_drc.h')
| -rw-r--r-- | libAACdec/src/aacdec_drc.h | 50 |
1 files changed, 49 insertions, 1 deletions
diff --git a/libAACdec/src/aacdec_drc.h b/libAACdec/src/aacdec_drc.h index 924ec6f..1873c5b 100644 --- a/libAACdec/src/aacdec_drc.h +++ b/libAACdec/src/aacdec_drc.h @@ -1,7 +1,7 @@ /* ----------------------------------------------------------------------------- Software License for The Fraunhofer FDK AAC Codec Library for Android -© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten +© Copyright 1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. All rights reserved. 1. INTRODUCTION @@ -109,6 +109,11 @@ amm-info@iis.fraunhofer.de #include "channel.h" #include "FDK_bitstream.h" +#define AACDEC_DRC_GAIN_SCALING (11) /* Scaling of DRC gains */ +#define AACDEC_DRC_GAIN_INIT_VALUE \ + (FL2FXCONST_DBL( \ + 1.0f / (1 << AACDEC_DRC_GAIN_SCALING))) /* Init value for DRC gains */ + #define AACDEC_DRC_DFLT_EXPIRY_FRAMES \ (0) /* Default DRC data expiry time in AAC frames */ @@ -136,6 +141,8 @@ typedef enum { /** * \brief DRC module interface functions */ +void aacDecoder_drcReset(HANDLE_AAC_DRC self); + void aacDecoder_drcInit(HANDLE_AAC_DRC self); void aacDecoder_drcInitChannelData(CDrcChannelData *pDrcChannel); @@ -189,4 +196,45 @@ int aacDecoder_drcEpilog( void aacDecoder_drcGetInfo(HANDLE_AAC_DRC self, SCHAR *pPresMode, SCHAR *pProgRefLevel); +/** + * \brief Apply DRC Level Normalization. + * + * This function prepares/applies the gain values for the DRC Level + * Normalization and returns the exponent of the time data. The following two + * cases are handled: + * + * - Limiter enabled: + * The input data must be interleaved. + * One gain per sample is written to the buffer pGainPerSample. + * If necessary the time data is rescaled. + * + * - Limiter disabled: + * The input data can be interleaved or deinterleaved. + * The gain values are applied to the time data. + * If necessary the time data is rescaled. + * + * \param hDrcInfo [i/o] handle to drc data structure. + * \param samplesIn [i/o] pointer to time data. + * \param pGain [i ] pointer to gain to be applied to + * the time data. + * \param pGainPerSample [o ] pointer to the gain per sample to + * be applied to the time data in the limiter. + * \param gain_scale [i ] exponent to be applied to the time + * data. + * \param gain_delay [i ] delay[samples] with which the gains + * in pGain shall be applied (gain_delay <= nSamples). + * \param nSamples [i ] number of samples per frame. + * \param channels [i ] number of channels. + * \param stride [i ] channel stride of time data. + * \param limiterEnabled [i ] 1 if limiter is enabled, otherwise + * 0. + * + * \return exponent of time data + */ +INT applyDrcLevelNormalization(HANDLE_AAC_DRC hDrcInfo, PCM_DEC *samplesIn, + FIXP_DBL *pGain, FIXP_DBL *pGainPerSample, + const INT gain_scale, const UINT gain_delay, + const UINT nSamples, const UINT channels, + const UINT stride, const UINT limiterEnabled); + #endif /* AACDEC_DRC_H */ |