*
* 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
*/
* Pitch delay is coded:
* with 1/3 resolution, -6 < pitch_delay - int(prev_pitch_delay) < 5
*
- * \remark The routine is used in G.729 @8k, AMR @10.2k, AMR @7.95k,
- * AMR @7.4k for the second subframe.
+ * \remark The routine is used in G.729 @@8k, AMR @@10.2k, AMR @@7.95k,
+ * AMR @@7.4k for the second subframe.
*/
int ff_acelp_decode_5_6_bit_to_2nd_delay3(
int ac_index,
* with 1/3 resolution, -2 < pitch_delay - int(prev_pitch_delay) < 1
* integers only, 1 <= pitch_delay - int(prev_pitch_delay) < 5
*
- * \remark The routine is used in G.729 @6.4k, AMR @6.7k, AMR @5.9k,
- * AMR @5.15k, AMR @4.75k for the second subframe.
+ * \remark The routine is used in G.729 @@6.4k, AMR @@6.7k, AMR @@5.9k,
+ * AMR @@5.15k, AMR @@4.75k for the second subframe.
*/
int ff_acelp_decode_4bit_to_2nd_delay3(
int ac_index,
* \brief Decode pitch delay of the first subframe encoded by 9 bits
* with 1/6 precision.
* \param ac_index adaptive codebook index (9 bits)
- * \param pitch_delay_min lower bound (integer) of pitch delay interval for
- * second subframe
*
* \return pitch delay in 1/6 units
*
* with 1/6 resolution, 17 < pitch_delay < 95
* integers only, 95 <= pitch_delay <= 143
*
- * \remark The routine is used in AMR @12.2k for the first and third subframes.
+ * \remark The routine is used in AMR @@12.2k for the first and third subframes.
*/
int ff_acelp_decode_9bit_to_1st_delay6(int ac_index);
* Pitch delay is coded:
* with 1/6 resolution, -6 < pitch_delay - int(prev_pitch_delay) < 5
*
- * \remark The routine is used in AMR @12.2k for the second and fourth subframes.
+ * \remark The routine is used in AMR @@12.2k for the second and fourth subframes.
*/
int ff_acelp_decode_6bit_to_2nd_delay6(
int ac_index,
/**
* \brief Update past quantized energies
- * \param quant_energy [in/out] past quantized energies (5.10)
+ * \param[in,out] quant_energy past quantized energies (5.10)
* \param gain_corr_factor gain correction factor
* \param log2_ma_pred_order log2() of MA prediction order
* \param erasure frame erasure flag
* \param gain_corr_factor gain correction factor (2.13)
* \param fc_v fixed-codebook vector (2.13)
* \param mr_energy mean innovation energy and fixed-point correction (7.13)
- * \param quant_energy [in/out] past quantized energies (5.10)
+ * \param[in,out] quant_energy past quantized energies (5.10)
* \param subframe_size length of subframe
- * \param ma_pred_order MA prediction order
*
* \return quantized fixed-codebook gain (14.1)
*
* Calculate fixed gain (part of section 6.1.3 of AMR spec)
*
* @param fixed_gain_factor gain correction factor
- * @param fixed_energy decoded algebraic codebook vector energy
+ * @param fixed_mean_energy mean decoded algebraic codebook vector energy
* @param prediction_error vector of the quantified predictor errors of
* the four previous subframes. It is updated by this function.
* @param energy_mean desired mean innovation energy
float *prediction_error, float energy_mean,
const float *pred_table);
+
+/**
+ * Decode the adaptive codebook index to the integer and fractional parts
+ * of the pitch lag for one subframe at 1/3 fractional precision.
+ *
+ * The choice of pitch lag is described in 3GPP TS 26.090 section 5.6.1.
+ *
+ * @param lag_int integer part of pitch lag of the current subframe
+ * @param lag_frac fractional part of pitch lag of the current subframe
+ * @param pitch_index parsed adaptive codebook (pitch) index
+ * @param prev_lag_int integer part of pitch lag for the previous subframe
+ * @param subframe current subframe number
+ * @param third_as_first treat the third frame the same way as the first
+ */
+void ff_decode_pitch_lag(int *lag_int, int *lag_frac, int pitch_index,
+ const int prev_lag_int, const int subframe,
+ int third_as_first, int resolution);
+
#endif /* AVCODEC_ACELP_PITCH_DELAY_H */
projects / ffmpeg / blobdiff