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author | Michael Niedermayer <michaelni@gmx.at> | 2011-03-30 03:01:41 +0200 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2011-03-30 03:09:08 +0200 |
commit | 445fdc014017a236fa7aa2645ffad7e8d0b45bee (patch) | |
tree | 1bd6be8b1dbf95535926c0e1348c63027ecb4339 /libavcodec/ac3dsp.h | |
parent | 55ce3c67bb25cd44889f2143ce9fd7dac3ab4a9d (diff) | |
parent | 52fd16a264d1eb14b1a84b7b38041da1756fb216 (diff) | |
download | ffmpeg-445fdc014017a236fa7aa2645ffad7e8d0b45bee.tar.gz |
Merge remote-tracking branch 'newdev/master'
* newdev/master:
ac3enc: move compute_mantissa_size() to ac3dsp
ac3enc: move mant*_cnt and qmant*_ptr out of AC3EncodeContext
Remove support for stripping executables
ac3enc: NEON optimised float_to_fixed24
ac3: move ff_ac3_bit_alloc_calc_bap to ac3dsp
dfa: protect pointer range checks against overflows.
Duplicate: mimic: implement multithreading.
Merged-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/ac3dsp.h')
-rw-r--r-- | libavcodec/ac3dsp.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/libavcodec/ac3dsp.h b/libavcodec/ac3dsp.h index 66dc32bd03..08680f382d 100644 --- a/libavcodec/ac3dsp.h +++ b/libavcodec/ac3dsp.h @@ -81,6 +81,30 @@ typedef struct AC3DSPContext { * constraints: multiple of 32 greater than zero */ void (*float_to_fixed24)(int32_t *dst, const float *src, unsigned int len); + + /** + * Calculate bit allocation pointers. + * The SNR is the difference between the masking curve and the signal. AC-3 + * uses this value for each frequency bin to allocate bits. The snroffset + * parameter is a global adjustment to the SNR for all bins. + * + * @param[in] mask masking curve + * @param[in] psd signal power for each frequency bin + * @param[in] start starting bin location + * @param[in] end ending bin location + * @param[in] snr_offset SNR adjustment + * @param[in] floor noise floor + * @param[in] bap_tab look-up table for bit allocation pointers + * @param[out] bap bit allocation pointers + */ + void (*bit_alloc_calc_bap)(int16_t *mask, int16_t *psd, int start, int end, + int snr_offset, int floor, + const uint8_t *bap_tab, uint8_t *bap); + + /** + * Calculate the number of bits needed to encode a set of mantissas. + */ + int (*compute_mantissa_size)(int mant_cnt[5], uint8_t *bap, int nb_coefs); } AC3DSPContext; void ff_ac3dsp_init (AC3DSPContext *c, int bit_exact); |