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authorMichael Niedermayer <michaelni@gmx.at>2011-03-30 03:01:41 +0200
committerMichael Niedermayer <michaelni@gmx.at>2011-03-30 03:09:08 +0200
commit445fdc014017a236fa7aa2645ffad7e8d0b45bee (patch)
tree1bd6be8b1dbf95535926c0e1348c63027ecb4339 /libavcodec/ac3dsp.h
parent55ce3c67bb25cd44889f2143ce9fd7dac3ab4a9d (diff)
parent52fd16a264d1eb14b1a84b7b38041da1756fb216 (diff)
downloadffmpeg-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.h24
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);