*
* Copyright (c) 2008 Vladimir Voroshilov
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
*/
/**
- * \brief ensure a minimum distance between LSFs
- * \param lsfq [in/out] LSF to check and adjust
- * \param lsfq_min_distance minimum distance between LSFs
- * \param lsfq_min minimum allowed LSF value
- * \param lsfq_max maximum allowed LSF value
- * \param lp_order LP filter order
+ * @brief ensure a minimum distance between LSFs
+ * @param[in,out] lsfq LSF to check and adjust
+ * @param lsfq_min_distance minimum distance between LSFs
+ * @param lsfq_min minimum allowed LSF value
+ * @param lsfq_max maximum allowed LSF value
+ * @param lp_order LP filter order
*/
void ff_acelp_reorder_lsf(int16_t* lsfq, int lsfq_min_distance, int lsfq_min, int lsfq_max, int lp_order);
*
* @param[in,out] lsf LSFs in Hertz
* @param min_spacing minimum distance between two consecutive lsf values
- * @param size size of the lsf vector
+ * @param size size of the lsf vector
*/
-void ff_set_min_dist_lsf(float *lsf, double min_spacing, int order);
+void ff_set_min_dist_lsf(float *lsf, double min_spacing, int size);
/**
- * \brief Convert LSF to LSP
- * \param lsp [out] LSP coefficients (-0x8000 <= (0.15) < 0x8000)
- * \param lsf normalized LSF coefficients (0 <= (2.13) < 0x2000 * PI)
- * \param lp_order LP filter order
+ * @brief Convert LSF to LSP
+ * @param[out] lsp LSP coefficients (-0x8000 <= (0.15) < 0x8000)
+ * @param lsf normalized LSF coefficients (0 <= (2.13) < 0x2000 * PI)
+ * @param lp_order LP filter order
*
- * \remark It is safe to pass the same array into the lsf and lsp parameters.
+ * @remark It is safe to pass the same array into the lsf and lsp parameters.
*/
void ff_acelp_lsf2lsp(int16_t *lsp, const int16_t *lsf, int lp_order);
/**
- * \brief LSP to LP conversion (3.2.6 of G.729)
- * \param lp [out] decoded LP coefficients (-0x8000 <= (3.12) < 0x8000)
- * \param lsp LSP coefficients (-0x8000 <= (0.15) < 0x8000)
- * \param lp_half_order LP filter order, divided by 2
+ * Floating point version of ff_acelp_lsf2lsp()
+ */
+void ff_acelp_lsf2lspd(double *lsp, const float *lsf, int lp_order);
+
+/**
+ * @brief LSP to LP conversion (3.2.6 of G.729)
+ * @param[out] lp decoded LP coefficients (-0x8000 <= (3.12) < 0x8000)
+ * @param lsp LSP coefficients (-0x8000 <= (0.15) < 0x8000)
+ * @param lp_half_order LP filter order, divided by 2
*/
void ff_acelp_lsp2lpc(int16_t* lp, const int16_t* lsp, int lp_half_order);
/**
- * \brief Interpolate LSP for the first subframe and convert LSP -> LP for both subframes (3.2.5 and 3.2.6 of G.729)
- * \param lp_1st [out] decoded LP coefficients for first subframe (-0x8000 <= (3.12) < 0x8000)
- * \param lp_2nd [out] decoded LP coefficients for second subframe (-0x8000 <= (3.12) < 0x8000)
- * \param lsp_2nd LSP coefficients of the second subframe (-0x8000 <= (0.15) < 0x8000)
- * \param lsp_prev LSP coefficients from the second subframe of the previous frame (-0x8000 <= (0.15) < 0x8000)
- * \param lp_order LP filter order
+ * LSP to LP conversion (5.2.4 of AMR-WB)
+ */
+void ff_amrwb_lsp2lpc(const double *lsp, float *lp, int lp_order);
+
+/**
+ * @brief Interpolate LSP for the first subframe and convert LSP -> LP for both subframes (3.2.5 and 3.2.6 of G.729)
+ * @param[out] lp_1st decoded LP coefficients for first subframe (-0x8000 <= (3.12) < 0x8000)
+ * @param[out] lp_2nd decoded LP coefficients for second subframe (-0x8000 <= (3.12) < 0x8000)
+ * @param lsp_2nd LSP coefficients of the second subframe (-0x8000 <= (0.15) < 0x8000)
+ * @param lsp_prev LSP coefficients from the second subframe of the previous frame (-0x8000 <= (0.15) < 0x8000)
+ * @param lp_order LP filter order
*/
void ff_acelp_lp_decode(int16_t* lp_1st, int16_t* lp_2nd, const int16_t* lsp_2nd, const int16_t* lsp_prev, int lp_order);
-#define MAX_LP_HALF_ORDER 8
+#define MAX_LP_HALF_ORDER 10
+#define MAX_LP_ORDER (2*MAX_LP_HALF_ORDER)
/**
- * Reconstructs LPC coefficients from the line spectral pair frequencies.
+ * Reconstruct LPC coefficients from the line spectral pair frequencies.
*
* @param lsp line spectral pairs in cosine domain
* @param lpc linear predictive coding coefficients
*/
void ff_acelp_lspd2lpc(const double *lsp, float *lpc, int lp_half_order);
+/**
+ * Sort values in ascending order.
+ *
+ * @note O(n) if data already sorted, O(n^2) - otherwise
+ */
+void ff_sort_nearly_sorted_floats(float *vals, int len);
+
+/**
+ * Compute the Pa / (1 + z(-1)) or Qa / (1 - z(-1)) coefficients
+ * needed for LSP to LPC conversion.
+ * We only need to calculate the 6 first elements of the polynomial.
+ *
+ * @param lsp line spectral pairs in cosine domain
+ * @param[out] f polynomial input/output as a vector
+ *
+ * TIA/EIA/IS-733 2.4.3.3.5-1/2
+ */
+void ff_lsp2polyf(const double *lsp, double *f, int lp_half_order);
+
#endif /* AVCODEC_LSP_H */