finalized bw_src_int
This commit is contained in:
Stefano D'Angelo
parent
40adc296a2
commit
9b123a28f2
@ -35,7 +35,12 @@
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* <ul>
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* <li>Version <strong>1.0.0</strong>:
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* <ul>
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* <li><code>Fixed frequency response and improved speed.</code></li>
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* <li>Added <code>bw_src_int_reset_state_multi()</code> and updated
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* C++ API in this regard.</li>
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* <li>Now <code>bw_src_int_reset_state()</code> returns the initial
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* output value.</li>
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* <li>Added overloaded C++ <code>reset()</code> functions taking
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* arrays as arguments.</li>
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* <li><code>bw_src_int_lim_process()</code> and
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* <code>bw_src_int_lim_process_multi()</code> now use
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* <code>size_t</code> to count samples and channels.</li>
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@ -44,9 +49,11 @@
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* <li>Moved C++ code to C header.</li>
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* <li>Added overloaded C++ <code>process()</code> function taking
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* C-style arrays as arguments.</li>
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* <li>Fixed frequency response and improved speed.</li>
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* <li>Removed usage of reserved identifiers.</li>
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* <li>Clarified that the same buffer cannot be used for both input and
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* output.</li>
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* <li>Added debugging code.</li>
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* </ul>
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* </li>
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* <li>Version <strong>0.6.0</strong>:
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@ -93,26 +100,55 @@ typedef struct bw_src_int_state bw_src_int_state;
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*
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* #### bw_src_int_init()
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* ```>>> */
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static inline void bw_src_int_init(bw_src_int_coeffs *BW_RESTRICT coeffs, int ratio);
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static inline void bw_src_int_init(
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bw_src_int_coeffs * BW_RESTRICT coeffs,
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int ratio);
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/*! <<<```
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* Initializes `coeffs` using the given resampling `ratio`.
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*
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* If `ratio` is positive, then the sample rate of the output signal will be
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* `ratio` times the sample rate of the input signal, otherwise, if it is
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* negative, then the sample rate of the output signal will be equal to the
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* sample rate of the input signal divided by `-ratio`. `ratio` *MUST NOT* be
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* in [`-1`, `1`].
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* sample rate of the input signal divided by `-ratio`.
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*
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* `ratio` must not be `0`.
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*
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* #### bw_src_int_reset_state()
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* ```>>> */
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static inline void bw_src_int_reset_state(const bw_src_int_coeffs *BW_RESTRICT coeffs, bw_src_int_state *BW_RESTRICT state, float x_0);
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static inline float bw_src_int_reset_state(
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const bw_src_int_coeffs * BW_RESTRICT coeffs,
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bw_src_int_state * BW_RESTRICT state,
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float x_0);
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/*! <<<```
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* Resets the given `state` to its initial values using the given `coeffs`
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* and the quiescent/initial input value `x_0`.
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* and the initial input value `x_0`.
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*
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* Returns the corresponding initial output value.
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*
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* #### bw_src_int_reset_state_multi()
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* ```>>> */
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static inline void bw_src_int_reset_state_multi(
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const bw_src_int_coeffs * BW_RESTRICT coeffs,
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bw_src_int_state * BW_RESTRICT const * BW_RESTRICT state,
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const float * x_0,
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float * y_0,
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size_t n_channels);
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/*! <<<```
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* Resets each of the `n_channels` `state`s to its initial values using the
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* given `coeffs` and the corresponding initial input value in the `x_0`
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* array.
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*
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* The corresponding initial output values are written into the `y_0` array,
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* if not `NULL`.
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*
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* #### bw_src_int_process()
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* ```>>> */
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static inline size_t bw_src_int_process(const bw_src_int_coeffs *BW_RESTRICT coeffs, bw_src_int_state *BW_RESTRICT state, const float *BW_RESTRICT x, float *BW_RESTRICT y, size_t n_in_samples);
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static inline size_t bw_src_int_process(
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const bw_src_int_coeffs * BW_RESTRICT coeffs,
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bw_src_int_state * BW_RESTRICT state,
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const float * BW_RESTRICT x,
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float * BW_RESTRICT y,
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size_t n_in_samples);
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/*! <<<```
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* Processes the first `n_in_samples` of the input buffer `x` and fills the
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* output buffer `y` using `coeffs`, while using and updating `state`.
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@ -127,7 +163,14 @@ static inline size_t bw_src_int_process(const bw_src_int_coeffs *BW_RESTRICT coe
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*
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* #### bw_src_int_process_multi()
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* ```>>> */
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static inline void bw_src_int_process_multi(const bw_src_int_coeffs *BW_RESTRICT coeffs, bw_src_int_state *BW_RESTRICT const *BW_RESTRICT state, const float * const *BW_RESTRICT x, float *BW_RESTRICT const *BW_RESTRICT y, size_t *BW_RESTRICT n, size_t n_channels, size_t n_in_samples);
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static inline void bw_src_int_process_multi(
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const bw_src_int_coeffs * BW_RESTRICT coeffs,
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bw_src_int_state * BW_RESTRICT const * BW_RESTRICT state,
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const float * const * BW_RESTRICT x,
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float *BW_RESTRICT const * BW_RESTRICT y,
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size_t n_channels,
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size_t n_in_samples,
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size_t * BW_RESTRICT n_out_samples);
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/*! <<<```
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* Processes the first `n_in_samples` of the `n_channels` input buffers `x`
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* and fills the `n_channels` output buffers `y` using `coeffs`, while using
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@ -140,8 +183,36 @@ static inline void bw_src_int_process_multi(const bw_src_int_coeffs *BW_RESTRICT
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*
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* A given buffer cannot be used both as an input and output buffer.
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*
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* `n` is filled with the number of generated output samples for each output
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* buffer, if not `NULL`.
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* `n_out_samples` is filled with the number of generated output samples for
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* each output buffer, if not `NULL`.
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*
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* #### bw_src_int_coeffs_is_valid()
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* ```>>> */
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static inline char bw_src_int_coeffs_is_valid(
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const bw_src_int_coeffs * BW_RESTRICT coeffs);
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/*! <<<```
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* Tries to determine whether `coeffs` is valid and returns non-`0` if it
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* seems to be the case and `0` if it is certainly not. False positives are
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* possible, false negatives are not.
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*
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* `coeffs` must at least point to a readable memory block of size greater
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* than or equal to that of `bw_src_int_coeffs`.
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*
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* #### bw_src_int_state_is_valid()
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* ```>>> */
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static inline char bw_src_int_state_is_valid(
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const bw_src_int_coeffs * BW_RESTRICT coeffs,
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const bw_src_int_state * BW_RESTRICT state);
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/*! <<<```
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* Tries to determine whether `state` is valid and returns non-`0` if it
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* seems to be the case and `0` if it is certainly not. False positives are
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* possible, false negatives are not.
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*
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* If `coeffs` is not `NULL` extra cross-checks might be performed (`state`
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* is supposed to be associated to `coeffs`).
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*
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* `state` must at least point to a readable memory block of size greater
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* than or equal to that of `bw_src_int_state`.
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* }}} */
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#ifdef __cplusplus
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@ -160,23 +231,39 @@ extern "C" {
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#endif
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struct bw_src_int_coeffs {
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int ratio;
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float b0;
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float ma1;
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float ma2;
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float ma3;
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float ma4;
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#ifdef BW_DEBUG_DEEP
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uint32_t hash;
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uint32_t reset_id;
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#endif
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// Coefficients
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int ratio;
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float b0;
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float ma1;
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float ma2;
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float ma3;
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float ma4;
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};
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struct bw_src_int_state {
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int i;
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float z1;
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float z2;
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float z3;
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float z4;
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#ifdef BW_DEBUG_DEEP
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uint32_t hash;
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uint32_t coeffs_reset_id;
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#endif
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// States
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int i;
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float z1;
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float z2;
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float z3;
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float z4;
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};
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static inline void bw_src_int_init(bw_src_int_coeffs *BW_RESTRICT coeffs, int ratio) {
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static inline void bw_src_int_init(
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bw_src_int_coeffs * BW_RESTRICT coeffs,
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int ratio) {
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BW_ASSERT(coeffs != NULL);
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coeffs->ratio = ratio;
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// 4th-degree Butterworth with cutoff at ratio * Nyquist, using bilinear transform w/ prewarping
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const float fc = (float)(ratio >= 0 ? ratio : -ratio);
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@ -188,9 +275,23 @@ static inline void bw_src_int_init(bw_src_int_coeffs *BW_RESTRICT coeffs, int ra
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coeffs->ma2 = k * ((6.82842712474619f - 6.f * T2) * T2 - 6.f);
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coeffs->ma3 = k * (T * (T2 * (5.226251859505504f - 4.f * T) - 5.226251859505504f) + 4.f);
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coeffs->ma4 = k * (T * (T * ((2.613125929752753f - T) * T - 3.414213562373095f) + 2.613125929752753f) - 1.f);
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#ifdef BW_DEBUG_DEEP
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coeffs->hash = bw_hash_sdbm("bw_src_int_coeffs");
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coeffs->reset_id = coeffs->hash + 1;
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#endif
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BW_ASSERT_DEEP(bw_src_int_coeffs_is_valid(coeffs));
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}
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static inline void bw_src_int_reset_state(const bw_src_int_coeffs *BW_RESTRICT coeffs, bw_src_int_state *BW_RESTRICT state, float x_0) {
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static inline float bw_src_int_reset_state(
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const bw_src_int_coeffs * BW_RESTRICT coeffs,
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bw_src_int_state * BW_RESTRICT state,
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float x_0) {
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BW_ASSERT(coeffs != NULL);
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BW_ASSERT_DEEP(bw_src_int_coeffs_is_valid(coeffs));
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BW_ASSERT(state != NULL);
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BW_ASSERT(bw_is_finite(x_0));
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if (coeffs->ratio < 0) {
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// DF-II
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state->z1 = x_0 / (1.f - coeffs->ma1 - coeffs->ma2 - coeffs->ma3 - coeffs->ma4);
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@ -206,9 +307,55 @@ static inline void bw_src_int_reset_state(const bw_src_int_coeffs *BW_RESTRICT c
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state->z2 = (6.f * coeffs->b0 + coeffs->ma2) * x_0 + state->z3;
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state->z1 = (k + coeffs->ma1) * x_0 + state->z2;
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}
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const float y = x_0;
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#ifdef BW_DEBUG_DEEP
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state->hash = bw_hash_sdbm("bw_src_int_state");
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state->coeffs_reset_id = coeffs->reset_id;
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#endif
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BW_ASSERT_DEEP(bw_src_int_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(bw_src_int_state_is_valid(coeffs, state));
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BW_ASSERT(bw_is_finite(y));
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return y;
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}
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static inline size_t bw_src_int_process(const bw_src_int_coeffs *BW_RESTRICT coeffs, bw_src_int_state *BW_RESTRICT state, const float *BW_RESTRICT x, float *BW_RESTRICT y, size_t n_in_samples) {
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static inline void bw_src_int_reset_state_multi(
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const bw_src_int_coeffs * BW_RESTRICT coeffs,
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bw_src_int_state * BW_RESTRICT const * BW_RESTRICT state,
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const float * x_0,
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float * y_0,
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size_t n_channels) {
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BW_ASSERT(coeffs != NULL);
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BW_ASSERT_DEEP(bw_src_int_coeffs_is_valid(coeffs));
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BW_ASSERT(state != NULL);
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BW_ASSERT(x_0 != NULL);
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if (y_0 != NULL)
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for (size_t i = 0; i < n_channels; i++)
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y_0[i] = bw_src_int_reset_state(coeffs, state[i], x_0[i]);
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else
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for (size_t i = 0; i < n_channels; i++)
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bw_src_int_reset_state(coeffs, state[i], x_0[i]);
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BW_ASSERT_DEEP(bw_src_int_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(y_0 != NULL ? bw_has_only_finite(y_0, n_channels) : 1);
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}
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static inline size_t bw_src_int_process(
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const bw_src_int_coeffs * BW_RESTRICT coeffs,
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bw_src_int_state * BW_RESTRICT state,
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const float * BW_RESTRICT x,
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float * BW_RESTRICT y,
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size_t n_in_samples) {
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BW_ASSERT(coeffs != NULL);
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BW_ASSERT_DEEP(bw_src_int_coeffs_is_valid(coeffs));
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BW_ASSERT(state != NULL);
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BW_ASSERT_DEEP(bw_src_int_state_is_valid(coeffs, state));
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BW_ASSERT(x != NULL);
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BW_ASSERT_DEEP(bw_has_only_finite(x, n_in_samples));
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BW_ASSERT(y != NULL);
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size_t n = 0;
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if (coeffs->ratio < 0) {
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for (size_t i = 0; i < n_in_samples; i++) {
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@ -250,16 +397,76 @@ static inline size_t bw_src_int_process(const bw_src_int_coeffs *BW_RESTRICT coe
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}
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}
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}
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BW_ASSERT_DEEP(bw_src_int_coeffs_is_valid(coeffs));
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BW_ASSERT_DEEP(bw_src_int_state_is_valid(coeffs, state));
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BW_ASSERT(n <= (coeffs->ratio > 0 ? coeffs->ratio * n_in_samples : n_in_samples / (-coeffs->ratio)) + 1);
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return n;
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}
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static inline void bw_src_int_process_multi(const bw_src_int_coeffs *BW_RESTRICT coeffs, bw_src_int_state *BW_RESTRICT const *BW_RESTRICT state, const float * const *BW_RESTRICT x, float *BW_RESTRICT const *BW_RESTRICT y, size_t *BW_RESTRICT n, size_t n_channels, size_t n_in_samples) {
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if (n != NULL)
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static inline void bw_src_int_process_multi(
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const bw_src_int_coeffs * BW_RESTRICT coeffs,
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bw_src_int_state * BW_RESTRICT const * BW_RESTRICT state,
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const float * const * BW_RESTRICT x,
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float *BW_RESTRICT const * BW_RESTRICT y,
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size_t n_channels,
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size_t n_in_samples,
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size_t * BW_RESTRICT n_out_samples) {
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BW_ASSERT(coeffs != NULL);
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BW_ASSERT_DEEP(bw_src_int_coeffs_is_valid(coeffs));
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BW_ASSERT(state != NULL);
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BW_ASSERT(x != NULL);
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BW_ASSERT(y != NULL);
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if (n_out_samples != NULL)
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for (size_t i = 0; i < n_channels; i++)
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n[i] = bw_src_int_process(coeffs, state[i], x[i], y[i], n_in_samples);
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n_out_samples[i] = bw_src_int_process(coeffs, state[i], x[i], y[i], n_in_samples);
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else
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for (size_t i = 0; i < n_channels; i++)
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bw_src_int_process(coeffs, state[i], x[i], y[i], n_in_samples);
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BW_ASSERT_DEEP(bw_src_int_coeffs_is_valid(coeffs));
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}
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static inline char bw_src_int_coeffs_is_valid(
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const bw_src_int_coeffs * BW_RESTRICT coeffs) {
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BW_ASSERT(coeffs != NULL);
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#ifdef BW_DEBUG_DEEP
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if (coeffs->hash != bw_hash_sdbm("bw_src_int_coeffs"))
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return 0;
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#endif
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return coeffs->ratio != 0
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&& bw_is_finite(coeffs->b0)
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&& bw_is_finite(coeffs->ma1)
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&& bw_is_finite(coeffs->ma2)
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&& bw_is_finite(coeffs->ma3)
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&& bw_is_finite(coeffs->ma4);
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}
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static inline char bw_src_int_state_is_valid(
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const bw_src_int_coeffs * BW_RESTRICT coeffs,
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const bw_src_int_state * BW_RESTRICT state) {
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BW_ASSERT(state != NULL);
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#ifdef BW_DEBUG_DEEP
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if (state->hash != bw_hash_sdbm("bw_src_int_state"))
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return 0;
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if (coeffs != NULL && coeffs->reset_id != state->coeffs_reset_id)
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return 0;
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#endif
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if (coeffs)
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if (coeffs->ratio < 0 && (state->i < 0 || state->i >= -coeffs->ratio))
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return 0;
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return bw_is_finite(state->z1)
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&& bw_is_finite(state->z2)
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&& bw_is_finite(state->z3)
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&& bw_is_finite(state->z4);
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}
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#ifdef __cplusplus
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@ -279,15 +486,33 @@ class SRCInt {
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public:
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SRCInt(int ratio);
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void reset(float x_0 = 0.f);
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std::array<size_t, N_CHANNELS> process(
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const float * const *x,
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float * const *y,
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size_t nInSamples);
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std::array<size_t, N_CHANNELS> process(
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std::array<const float *, N_CHANNELS> x,
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std::array<float *, N_CHANNELS> y,
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size_t nInSamples);
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void reset(
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float x0 = 0.f,
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float * BW_RESTRICT y0 = nullptr);
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void reset(
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float x0,
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std::array<float, N_CHANNELS> * BW_RESTRICT y0);
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void reset(
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const float * x0,
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float * y0 = nullptr);
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void reset(
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std::array<float, N_CHANNELS> x0,
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std::array<float, N_CHANNELS> * BW_RESTRICT y0 = nullptr);
|
||||
|
||||
void process(
|
||||
const float * const * BW_RESTRICT x,
|
||||
float * const * BW_RESTRICT y,
|
||||
size_t nInSamples,
|
||||
size_t * BW_RESTRICT nOutSamples = nullptr);
|
||||
|
||||
void process(
|
||||
std::array<const float * BW_RESTRICT, N_CHANNELS> x,
|
||||
std::array<float * BW_RESTRICT, N_CHANNELS> y,
|
||||
size_t nInSamples,
|
||||
std::array<size_t, N_CHANNELS> * BW_RESTRICT nOutSamples = nullptr);
|
||||
/*! <<<...
|
||||
* }
|
||||
* ```
|
||||
@ -299,40 +524,68 @@ public:
|
||||
* change at any time in future versions. Please, do not use it directly. */
|
||||
|
||||
private:
|
||||
bw_src_int_coeffs coeffs;
|
||||
bw_src_int_state states[N_CHANNELS];
|
||||
bw_src_int_state *BW_RESTRICT statesP[N_CHANNELS];
|
||||
bw_src_int_coeffs coeffs;
|
||||
bw_src_int_state states[N_CHANNELS];
|
||||
bw_src_int_state * BW_RESTRICT statesP[N_CHANNELS];
|
||||
};
|
||||
|
||||
template<size_t N_CHANNELS>
|
||||
inline SRCInt<N_CHANNELS>::SRCInt(int ratio) {
|
||||
inline SRCInt<N_CHANNELS>::SRCInt(
|
||||
int ratio) {
|
||||
bw_src_int_init(&coeffs, ratio);
|
||||
for (size_t i = 0; i < N_CHANNELS; i++)
|
||||
statesP[i] = states + i;
|
||||
}
|
||||
|
||||
template<size_t N_CHANNELS>
|
||||
inline void SRCInt<N_CHANNELS>::reset(float x_0) {
|
||||
for (size_t i = 0; i < N_CHANNELS; i++)
|
||||
bw_src_int_reset_state(&coeffs, states + i, x_0);
|
||||
inline void SRCInt<N_CHANNELS>::reset(
|
||||
float x0,
|
||||
float * BW_RESTRICT y0) {
|
||||
if (y0 != nullptr)
|
||||
for (size_t i = 0; i < N_CHANNELS; i++)
|
||||
y0[i] = bw_src_int_reset_state(&coeffs, states + i, x0);
|
||||
else
|
||||
for (size_t i = 0; i < N_CHANNELS; i++)
|
||||
bw_src_int_reset_state(&coeffs, states + i, x0);
|
||||
}
|
||||
|
||||
template<size_t N_CHANNELS>
|
||||
inline std::array<size_t, N_CHANNELS> SRCInt<N_CHANNELS>::process(
|
||||
const float * const *x,
|
||||
float * const *y,
|
||||
size_t nInSamples) {
|
||||
std::array<size_t, N_CHANNELS> ret;
|
||||
bw_src_int_process_multi(&coeffs, statesP, x, y, ret.data(), N_CHANNELS, nInSamples);
|
||||
return ret;
|
||||
inline void SRCInt<N_CHANNELS>::reset(
|
||||
float x0,
|
||||
std::array<float, N_CHANNELS> * BW_RESTRICT y0) {
|
||||
reset(x0, y0 != nullptr ? y0->data() : nullptr);
|
||||
}
|
||||
|
||||
template<size_t N_CHANNELS>
|
||||
inline std::array<size_t, N_CHANNELS> SRCInt<N_CHANNELS>::process(
|
||||
std::array<const float *, N_CHANNELS> x,
|
||||
std::array<float *, N_CHANNELS> y,
|
||||
size_t nInSamples) {
|
||||
return process(x.data(), y.data(), nInSamples);
|
||||
inline void SRCInt<N_CHANNELS>::reset(
|
||||
const float * x0,
|
||||
float * y0) {
|
||||
bw_src_int_reset_state_multi(&coeffs, statesP, x0, y0, N_CHANNELS);
|
||||
}
|
||||
|
||||
template<size_t N_CHANNELS>
|
||||
inline void SRCInt<N_CHANNELS>::reset(
|
||||
std::array<float, N_CHANNELS> x0,
|
||||
std::array<float, N_CHANNELS> * BW_RESTRICT y0) {
|
||||
reset(x0.data(), y0 != nullptr ? y0->data() : nullptr);
|
||||
}
|
||||
|
||||
template<size_t N_CHANNELS>
|
||||
inline void SRCInt<N_CHANNELS>::process(
|
||||
const float * const * BW_RESTRICT x,
|
||||
float * const * BW_RESTRICT y,
|
||||
size_t nInSamples,
|
||||
size_t * BW_RESTRICT nOutSamples) {
|
||||
bw_src_int_process_multi(&coeffs, statesP, x, y, N_CHANNELS, nInSamples, nOutSamples);
|
||||
}
|
||||
|
||||
template<size_t N_CHANNELS>
|
||||
inline void SRCInt<N_CHANNELS>::process(
|
||||
std::array<const float * BW_RESTRICT, N_CHANNELS> x,
|
||||
std::array<float * BW_RESTRICT, N_CHANNELS> y,
|
||||
size_t nInSamples,
|
||||
std::array<size_t, N_CHANNELS> * BW_RESTRICT nOutSamples) {
|
||||
process(x.data(), y.data(), nInSamples, nOutSamples ? nOutSamples->data() : nullptr);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user