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@ -79,14 +79,14 @@ |
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extern const int16_t ff_acelp_interp_filter[61]; |
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extern const int16_t ff_acelp_interp_filter[61]; |
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/**
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/**
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* \brief Generic interpolation routine |
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* Generic interpolation routine. |
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* \param out [out] buffer for interpolated data |
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* @param out [out] buffer for interpolated data |
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* \param in input data |
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* @param in input data |
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* \param filter_coeffs interpolation filter coefficients (0.15) |
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* @param filter_coeffs interpolation filter coefficients (0.15) |
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* \param precision filter is able to interpolate with 1/precision precision of pitch delay |
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* @param precision filter is able to interpolate with 1/precision precision of pitch delay |
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* \param pitch_delay_frac pitch delay, fractional part [0..precision-1] |
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* @param pitch_delay_frac pitch delay, fractional part [0..precision-1] |
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* \param filter_length filter length |
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* @param filter_length filter length |
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* \param length length of speech data to process |
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* @param length length of speech data to process |
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* |
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* |
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* filter_coeffs contains coefficients of the positive half of the symmetric |
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* filter_coeffs contains coefficients of the positive half of the symmetric |
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* interpolation filter. filter_coeffs[0] should the central (unpaired) coefficient. |
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* interpolation filter. filter_coeffs[0] should the central (unpaired) coefficient. |
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@ -103,11 +103,11 @@ void ff_acelp_interpolate( |
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int length); |
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int length); |
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/**
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/**
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* \brief Circularly convolve fixed vector with a phase dispersion impulse |
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* Circularly convolve fixed vector with a phase dispersion impulse |
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* response filter (D.6.2 of G.729 and 6.1.5 of AMR). |
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* response filter (D.6.2 of G.729 and 6.1.5 of AMR). |
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* \param fc_out vector with filter applied |
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* @param fc_out vector with filter applied |
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* \param fc_in source vector |
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* @param fc_in source vector |
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* \param filter phase filter coefficients |
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* @param filter phase filter coefficients |
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* |
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* |
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* fc_out[n] = sum(i,0,len-1){ fc_in[i] * filter[(len + n - i)%len] } |
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* fc_out[n] = sum(i,0,len-1){ fc_in[i] * filter[(len + n - i)%len] } |
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* |
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* |
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@ -120,19 +120,19 @@ void ff_acelp_convolve_circ( |
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int subframe_size); |
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int subframe_size); |
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/**
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/**
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* \brief LP synthesis filter |
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* LP synthesis filter. |
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* \param out [out] pointer to output buffer |
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* @param out [out] pointer to output buffer |
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* \param filter_coeffs filter coefficients (-0x8000 <= (3.12) < 0x8000) |
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* @param filter_coeffs filter coefficients (-0x8000 <= (3.12) < 0x8000) |
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* \param in input signal |
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* @param in input signal |
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* \param buffer_length amount of data to process |
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* @param buffer_length amount of data to process |
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* \param filter_length filter length (10 for 10th order LP filter) |
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* @param filter_length filter length (10 for 10th order LP filter) |
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* \param stop_on_overflow 1 - return immediately if overflow occurs |
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* @param stop_on_overflow 1 - return immediately if overflow occurs |
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* 0 - ignore overflows |
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* 0 - ignore overflows |
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* \param rounder the amount to add for rounding (usually 0x800 or 0xfff) |
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* @param rounder the amount to add for rounding (usually 0x800 or 0xfff) |
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* |
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* |
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* \return 1 if overflow occurred, 0 - otherwise |
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* @return 1 if overflow occurred, 0 - otherwise |
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* |
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* |
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* \note Output buffer must contain 10 samples of past |
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* @note Output buffer must contain 10 samples of past |
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* speech data before pointer. |
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* speech data before pointer. |
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* |
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* |
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* Routine applies 1/A(z) filter to given speech data. |
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* Routine applies 1/A(z) filter to given speech data. |
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@ -147,12 +147,12 @@ int ff_acelp_lp_synthesis_filter( |
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int rounder); |
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int rounder); |
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/**
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/**
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* \brief Calculates coefficients of weighted A(z/weight) filter. |
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* Calculates coefficients of weighted A(z/weight) filter. |
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* \param out [out] weighted A(z/weight) result |
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* @param out [out] weighted A(z/weight) result |
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* filter (-0x8000 <= (3.12) < 0x8000) |
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* filter (-0x8000 <= (3.12) < 0x8000) |
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* \param in source filter (-0x8000 <= (3.12) < 0x8000) |
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* @param in source filter (-0x8000 <= (3.12) < 0x8000) |
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* \param weight_pow array containing weight^i (-0x8000 <= (0.15) < 0x8000) |
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* @param weight_pow array containing weight^i (-0x8000 <= (0.15) < 0x8000) |
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* \param filter_length filter length (11 for 10th order LP filter) |
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* @param filter_length filter length (11 for 10th order LP filter) |
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* |
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* |
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* out[i]=weight_pow[i]*in[i] , i=0..9 |
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* out[i]=weight_pow[i]*in[i] , i=0..9 |
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*/ |
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*/ |
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@ -163,24 +163,24 @@ void ff_acelp_weighted_filter( |
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int filter_length); |
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int filter_length); |
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/**
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/**
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* \brief high-pass filtering and upscaling (4.2.5 of G.729) |
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* high-pass filtering and upscaling (4.2.5 of G.729). |
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* \param out [out] output buffer for filtered speech data |
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* @param out [out] output buffer for filtered speech data |
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* \param hpf_f [in/out] past filtered data from previous (2 items long) |
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* @param hpf_f [in/out] past filtered data from previous (2 items long) |
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* frames (-0x20000000 <= (14.13) < 0x20000000) |
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* frames (-0x20000000 <= (14.13) < 0x20000000) |
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* \param in speech data to process |
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* @param in speech data to process |
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* \param length input data size |
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* @param length input data size |
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* |
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* |
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* out[i] = 0.93980581 * in[i] - 1.8795834 * in[i-1] + 0.93980581 * in[i-2] + |
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* out[i] = 0.93980581 * in[i] - 1.8795834 * in[i-1] + 0.93980581 * in[i-2] + |
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* 1.9330735 * out[i-1] - 0.93589199 * out[i-2] |
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* 1.9330735 * out[i-1] - 0.93589199 * out[i-2] |
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* |
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* |
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* The filter has a cut-off frequency of 100Hz |
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* The filter has a cut-off frequency of 100Hz |
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* |
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* |
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* \note Two items before the top of the out buffer must contain two items from the |
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* @note Two items before the top of the out buffer must contain two items from the |
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* tail of the previous subframe. |
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* tail of the previous subframe. |
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* |
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* |
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* \remark It is safe to pass the same array in in and out parameters. |
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* @remark It is safe to pass the same array in in and out parameters. |
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* |
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* |
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* \remark AMR uses mostly the same filter (cut-off frequency 60Hz, same formula, |
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* @remark AMR uses mostly the same filter (cut-off frequency 60Hz, same formula, |
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* but constants differs in 5th sign after comma). Fortunately in |
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* but constants differs in 5th sign after comma). Fortunately in |
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* fixed-point all coefficients are the same as in G.729. Thus this |
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* fixed-point all coefficients are the same as in G.729. Thus this |
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* routine can be used for the fixed-point AMR decoder, too. |
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* routine can be used for the fixed-point AMR decoder, too. |
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