yading@10: /*
yading@10:  * Real Audio 1.0 (14.4K) encoder
yading@10:  * Copyright (c) 2010 Francesco Lavra <francescolavra@interfree.it>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Real Audio 1.0 (14.4K) encoder
yading@10:  * @author Francesco Lavra <francescolavra@interfree.it>
yading@10:  */
yading@10: 
yading@10: #include <float.h>
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "audio_frame_queue.h"
yading@10: #include "internal.h"
yading@10: #include "put_bits.h"
yading@10: #include "celp_filters.h"
yading@10: #include "ra144.h"
yading@10: 
yading@10: 
yading@10: static av_cold int ra144_encode_close(AVCodecContext *avctx)
yading@10: {
yading@10:     RA144Context *ractx = avctx->priv_data;
yading@10:     ff_lpc_end(&ractx->lpc_ctx);
yading@10:     ff_af_queue_close(&ractx->afq);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: 
yading@10: static av_cold int ra144_encode_init(AVCodecContext * avctx)
yading@10: {
yading@10:     RA144Context *ractx;
yading@10:     int ret;
yading@10: 
yading@10:     if (avctx->channels != 1) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid number of channels: %d\n",
yading@10:                avctx->channels);
yading@10:         return -1;
yading@10:     }
yading@10:     avctx->frame_size = NBLOCKS * BLOCKSIZE;
yading@10:     avctx->delay      = avctx->frame_size;
yading@10:     avctx->bit_rate = 8000;
yading@10:     ractx = avctx->priv_data;
yading@10:     ractx->lpc_coef[0] = ractx->lpc_tables[0];
yading@10:     ractx->lpc_coef[1] = ractx->lpc_tables[1];
yading@10:     ractx->avctx = avctx;
yading@10:     ret = ff_lpc_init(&ractx->lpc_ctx, avctx->frame_size, LPC_ORDER,
yading@10:                       FF_LPC_TYPE_LEVINSON);
yading@10:     if (ret < 0)
yading@10:         goto error;
yading@10: 
yading@10:     ff_af_queue_init(avctx, &ractx->afq);
yading@10: 
yading@10:     return 0;
yading@10: error:
yading@10:     ra144_encode_close(avctx);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: 
yading@10: /**
yading@10:  * Quantize a value by searching a sorted table for the element with the
yading@10:  * nearest value
yading@10:  *
yading@10:  * @param value value to quantize
yading@10:  * @param table array containing the quantization table
yading@10:  * @param size size of the quantization table
yading@10:  * @return index of the quantization table corresponding to the element with the
yading@10:  *         nearest value
yading@10:  */
yading@10: static int quantize(int value, const int16_t *table, unsigned int size)
yading@10: {
yading@10:     unsigned int low = 0, high = size - 1;
yading@10: 
yading@10:     while (1) {
yading@10:         int index = (low + high) >> 1;
yading@10:         int error = table[index] - value;
yading@10: 
yading@10:         if (index == low)
yading@10:             return table[high] + error > value ? low : high;
yading@10:         if (error > 0) {
yading@10:             high = index;
yading@10:         } else {
yading@10:             low = index;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: 
yading@10: /**
yading@10:  * Orthogonalize a vector to another vector
yading@10:  *
yading@10:  * @param v vector to orthogonalize
yading@10:  * @param u vector against which orthogonalization is performed
yading@10:  */
yading@10: static void orthogonalize(float *v, const float *u)
yading@10: {
yading@10:     int i;
yading@10:     float num = 0, den = 0;
yading@10: 
yading@10:     for (i = 0; i < BLOCKSIZE; i++) {
yading@10:         num += v[i] * u[i];
yading@10:         den += u[i] * u[i];
yading@10:     }
yading@10:     num /= den;
yading@10:     for (i = 0; i < BLOCKSIZE; i++)
yading@10:         v[i] -= num * u[i];
yading@10: }
yading@10: 
yading@10: 
yading@10: /**
yading@10:  * Calculate match score and gain of an LPC-filtered vector with respect to
yading@10:  * input data, possibly othogonalizing it to up to 2 other vectors
yading@10:  *
yading@10:  * @param work array used to calculate the filtered vector
yading@10:  * @param coefs coefficients of the LPC filter
yading@10:  * @param vect original vector
yading@10:  * @param ortho1 first vector against which orthogonalization is performed
yading@10:  * @param ortho2 second vector against which orthogonalization is performed
yading@10:  * @param data input data
yading@10:  * @param score pointer to variable where match score is returned
yading@10:  * @param gain pointer to variable where gain is returned
yading@10:  */
yading@10: static void get_match_score(float *work, const float *coefs, float *vect,
yading@10:                             const float *ortho1, const float *ortho2,
yading@10:                             const float *data, float *score, float *gain)
yading@10: {
yading@10:     float c, g;
yading@10:     int i;
yading@10: 
yading@10:     ff_celp_lp_synthesis_filterf(work, coefs, vect, BLOCKSIZE, LPC_ORDER);
yading@10:     if (ortho1)
yading@10:         orthogonalize(work, ortho1);
yading@10:     if (ortho2)
yading@10:         orthogonalize(work, ortho2);
yading@10:     c = g = 0;
yading@10:     for (i = 0; i < BLOCKSIZE; i++) {
yading@10:         g += work[i] * work[i];
yading@10:         c += data[i] * work[i];
yading@10:     }
yading@10:     if (c <= 0) {
yading@10:         *score = 0;
yading@10:         return;
yading@10:     }
yading@10:     *gain = c / g;
yading@10:     *score = *gain * c;
yading@10: }
yading@10: 
yading@10: 
yading@10: /**
yading@10:  * Create a vector from the adaptive codebook at a given lag value
yading@10:  *
yading@10:  * @param vect array where vector is stored
yading@10:  * @param cb adaptive codebook
yading@10:  * @param lag lag value
yading@10:  */
yading@10: static void create_adapt_vect(float *vect, const int16_t *cb, int lag)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     cb += BUFFERSIZE - lag;
yading@10:     for (i = 0; i < FFMIN(BLOCKSIZE, lag); i++)
yading@10:         vect[i] = cb[i];
yading@10:     if (lag < BLOCKSIZE)
yading@10:         for (i = 0; i < BLOCKSIZE - lag; i++)
yading@10:             vect[lag + i] = cb[i];
yading@10: }
yading@10: 
yading@10: 
yading@10: /**
yading@10:  * Search the adaptive codebook for the best entry and gain and remove its
yading@10:  * contribution from input data
yading@10:  *
yading@10:  * @param adapt_cb array from which the adaptive codebook is extracted
yading@10:  * @param work array used to calculate LPC-filtered vectors
yading@10:  * @param coefs coefficients of the LPC filter
yading@10:  * @param data input data
yading@10:  * @return index of the best entry of the adaptive codebook
yading@10:  */
yading@10: static int adaptive_cb_search(const int16_t *adapt_cb, float *work,
yading@10:                               const float *coefs, float *data)
yading@10: {
yading@10:     int i, av_uninit(best_vect);
yading@10:     float score, gain, best_score, av_uninit(best_gain);
yading@10:     float exc[BLOCKSIZE];
yading@10: 
yading@10:     gain = best_score = 0;
yading@10:     for (i = BLOCKSIZE / 2; i <= BUFFERSIZE; i++) {
yading@10:         create_adapt_vect(exc, adapt_cb, i);
yading@10:         get_match_score(work, coefs, exc, NULL, NULL, data, &score, &gain);
yading@10:         if (score > best_score) {
yading@10:             best_score = score;
yading@10:             best_vect = i;
yading@10:             best_gain = gain;
yading@10:         }
yading@10:     }
yading@10:     if (!best_score)
yading@10:         return 0;
yading@10: 
yading@10:     /**
yading@10:      * Re-calculate the filtered vector from the vector with maximum match score
yading@10:      * and remove its contribution from input data.
yading@10:      */
yading@10:     create_adapt_vect(exc, adapt_cb, best_vect);
yading@10:     ff_celp_lp_synthesis_filterf(work, coefs, exc, BLOCKSIZE, LPC_ORDER);
yading@10:     for (i = 0; i < BLOCKSIZE; i++)
yading@10:         data[i] -= best_gain * work[i];
yading@10:     return best_vect - BLOCKSIZE / 2 + 1;
yading@10: }
yading@10: 
yading@10: 
yading@10: /**
yading@10:  * Find the best vector of a fixed codebook by applying an LPC filter to
yading@10:  * codebook entries, possibly othogonalizing them to up to 2 other vectors and
yading@10:  * matching the results with input data
yading@10:  *
yading@10:  * @param work array used to calculate the filtered vectors
yading@10:  * @param coefs coefficients of the LPC filter
yading@10:  * @param cb fixed codebook
yading@10:  * @param ortho1 first vector against which orthogonalization is performed
yading@10:  * @param ortho2 second vector against which orthogonalization is performed
yading@10:  * @param data input data
yading@10:  * @param idx pointer to variable where the index of the best codebook entry is
yading@10:  *        returned
yading@10:  * @param gain pointer to variable where the gain of the best codebook entry is
yading@10:  *        returned
yading@10:  */
yading@10: static void find_best_vect(float *work, const float *coefs,
yading@10:                            const int8_t cb[][BLOCKSIZE], const float *ortho1,
yading@10:                            const float *ortho2, float *data, int *idx,
yading@10:                            float *gain)
yading@10: {
yading@10:     int i, j;
yading@10:     float g, score, best_score;
yading@10:     float vect[BLOCKSIZE];
yading@10: 
yading@10:     *idx = *gain = best_score = 0;
yading@10:     for (i = 0; i < FIXED_CB_SIZE; i++) {
yading@10:         for (j = 0; j < BLOCKSIZE; j++)
yading@10:             vect[j] = cb[i][j];
yading@10:         get_match_score(work, coefs, vect, ortho1, ortho2, data, &score, &g);
yading@10:         if (score > best_score) {
yading@10:             best_score = score;
yading@10:             *idx = i;
yading@10:             *gain = g;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: 
yading@10: /**
yading@10:  * Search the two fixed codebooks for the best entry and gain
yading@10:  *
yading@10:  * @param work array used to calculate LPC-filtered vectors
yading@10:  * @param coefs coefficients of the LPC filter
yading@10:  * @param data input data
yading@10:  * @param cba_idx index of the best entry of the adaptive codebook
yading@10:  * @param cb1_idx pointer to variable where the index of the best entry of the
yading@10:  *        first fixed codebook is returned
yading@10:  * @param cb2_idx pointer to variable where the index of the best entry of the
yading@10:  *        second fixed codebook is returned
yading@10:  */
yading@10: static void fixed_cb_search(float *work, const float *coefs, float *data,
yading@10:                             int cba_idx, int *cb1_idx, int *cb2_idx)
yading@10: {
yading@10:     int i, ortho_cb1;
yading@10:     float gain;
yading@10:     float cba_vect[BLOCKSIZE], cb1_vect[BLOCKSIZE];
yading@10:     float vect[BLOCKSIZE];
yading@10: 
yading@10:     /**
yading@10:      * The filtered vector from the adaptive codebook can be retrieved from
yading@10:      * work, because this function is called just after adaptive_cb_search().
yading@10:      */
yading@10:     if (cba_idx)
yading@10:         memcpy(cba_vect, work, sizeof(cba_vect));
yading@10: 
yading@10:     find_best_vect(work, coefs, ff_cb1_vects, cba_idx ? cba_vect : NULL, NULL,
yading@10:                    data, cb1_idx, &gain);
yading@10: 
yading@10:     /**
yading@10:      * Re-calculate the filtered vector from the vector with maximum match score
yading@10:      * and remove its contribution from input data.
yading@10:      */
yading@10:     if (gain) {
yading@10:         for (i = 0; i < BLOCKSIZE; i++)
yading@10:             vect[i] = ff_cb1_vects[*cb1_idx][i];
yading@10:         ff_celp_lp_synthesis_filterf(work, coefs, vect, BLOCKSIZE, LPC_ORDER);
yading@10:         if (cba_idx)
yading@10:             orthogonalize(work, cba_vect);
yading@10:         for (i = 0; i < BLOCKSIZE; i++)
yading@10:             data[i] -= gain * work[i];
yading@10:         memcpy(cb1_vect, work, sizeof(cb1_vect));
yading@10:         ortho_cb1 = 1;
yading@10:     } else
yading@10:         ortho_cb1 = 0;
yading@10: 
yading@10:     find_best_vect(work, coefs, ff_cb2_vects, cba_idx ? cba_vect : NULL,
yading@10:                    ortho_cb1 ? cb1_vect : NULL, data, cb2_idx, &gain);
yading@10: }
yading@10: 
yading@10: 
yading@10: /**
yading@10:  * Encode a subblock of the current frame
yading@10:  *
yading@10:  * @param ractx encoder context
yading@10:  * @param sblock_data input data of the subblock
yading@10:  * @param lpc_coefs coefficients of the LPC filter
yading@10:  * @param rms RMS of the reflection coefficients
yading@10:  * @param pb pointer to PutBitContext of the current frame
yading@10:  */
yading@10: static void ra144_encode_subblock(RA144Context *ractx,
yading@10:                                   const int16_t *sblock_data,
yading@10:                                   const int16_t *lpc_coefs, unsigned int rms,
yading@10:                                   PutBitContext *pb)
yading@10: {
yading@10:     float data[BLOCKSIZE] = { 0 }, work[LPC_ORDER + BLOCKSIZE];
yading@10:     float coefs[LPC_ORDER];
yading@10:     float zero[BLOCKSIZE], cba[BLOCKSIZE], cb1[BLOCKSIZE], cb2[BLOCKSIZE];
yading@10:     int16_t cba_vect[BLOCKSIZE];
yading@10:     int cba_idx, cb1_idx, cb2_idx, gain;
yading@10:     int i, n;
yading@10:     unsigned m[3];
yading@10:     float g[3];
yading@10:     float error, best_error;
yading@10: 
yading@10:     for (i = 0; i < LPC_ORDER; i++) {
yading@10:         work[i] = ractx->curr_sblock[BLOCKSIZE + i];
yading@10:         coefs[i] = lpc_coefs[i] * (1/4096.0);
yading@10:     }
yading@10: 
yading@10:     /**
yading@10:      * Calculate the zero-input response of the LPC filter and subtract it from
yading@10:      * input data.
yading@10:      */
yading@10:     ff_celp_lp_synthesis_filterf(work + LPC_ORDER, coefs, data, BLOCKSIZE,
yading@10:                                  LPC_ORDER);
yading@10:     for (i = 0; i < BLOCKSIZE; i++) {
yading@10:         zero[i] = work[LPC_ORDER + i];
yading@10:         data[i] = sblock_data[i] - zero[i];
yading@10:     }
yading@10: 
yading@10:     /**
yading@10:      * Codebook search is performed without taking into account the contribution
yading@10:      * of the previous subblock, since it has been just subtracted from input
yading@10:      * data.
yading@10:      */
yading@10:     memset(work, 0, LPC_ORDER * sizeof(*work));
yading@10: 
yading@10:     cba_idx = adaptive_cb_search(ractx->adapt_cb, work + LPC_ORDER, coefs,
yading@10:                                  data);
yading@10:     if (cba_idx) {
yading@10:         /**
yading@10:          * The filtered vector from the adaptive codebook can be retrieved from
yading@10:          * work, see implementation of adaptive_cb_search().
yading@10:          */
yading@10:         memcpy(cba, work + LPC_ORDER, sizeof(cba));
yading@10: 
yading@10:         ff_copy_and_dup(cba_vect, ractx->adapt_cb, cba_idx + BLOCKSIZE / 2 - 1);
yading@10:         m[0] = (ff_irms(cba_vect) * rms) >> 12;
yading@10:     }
yading@10:     fixed_cb_search(work + LPC_ORDER, coefs, data, cba_idx, &cb1_idx, &cb2_idx);
yading@10:     for (i = 0; i < BLOCKSIZE; i++) {
yading@10:         cb1[i] = ff_cb1_vects[cb1_idx][i];
yading@10:         cb2[i] = ff_cb2_vects[cb2_idx][i];
yading@10:     }
yading@10:     ff_celp_lp_synthesis_filterf(work + LPC_ORDER, coefs, cb1, BLOCKSIZE,
yading@10:                                  LPC_ORDER);
yading@10:     memcpy(cb1, work + LPC_ORDER, sizeof(cb1));
yading@10:     m[1] = (ff_cb1_base[cb1_idx] * rms) >> 8;
yading@10:     ff_celp_lp_synthesis_filterf(work + LPC_ORDER, coefs, cb2, BLOCKSIZE,
yading@10:                                  LPC_ORDER);
yading@10:     memcpy(cb2, work + LPC_ORDER, sizeof(cb2));
yading@10:     m[2] = (ff_cb2_base[cb2_idx] * rms) >> 8;
yading@10:     best_error = FLT_MAX;
yading@10:     gain = 0;
yading@10:     for (n = 0; n < 256; n++) {
yading@10:         g[1] = ((ff_gain_val_tab[n][1] * m[1]) >> ff_gain_exp_tab[n]) *
yading@10:                (1/4096.0);
yading@10:         g[2] = ((ff_gain_val_tab[n][2] * m[2]) >> ff_gain_exp_tab[n]) *
yading@10:                (1/4096.0);
yading@10:         error = 0;
yading@10:         if (cba_idx) {
yading@10:             g[0] = ((ff_gain_val_tab[n][0] * m[0]) >> ff_gain_exp_tab[n]) *
yading@10:                    (1/4096.0);
yading@10:             for (i = 0; i < BLOCKSIZE; i++) {
yading@10:                 data[i] = zero[i] + g[0] * cba[i] + g[1] * cb1[i] +
yading@10:                           g[2] * cb2[i];
yading@10:                 error += (data[i] - sblock_data[i]) *
yading@10:                          (data[i] - sblock_data[i]);
yading@10:             }
yading@10:         } else {
yading@10:             for (i = 0; i < BLOCKSIZE; i++) {
yading@10:                 data[i] = zero[i] + g[1] * cb1[i] + g[2] * cb2[i];
yading@10:                 error += (data[i] - sblock_data[i]) *
yading@10:                          (data[i] - sblock_data[i]);
yading@10:             }
yading@10:         }
yading@10:         if (error < best_error) {
yading@10:             best_error = error;
yading@10:             gain = n;
yading@10:         }
yading@10:     }
yading@10:     put_bits(pb, 7, cba_idx);
yading@10:     put_bits(pb, 8, gain);
yading@10:     put_bits(pb, 7, cb1_idx);
yading@10:     put_bits(pb, 7, cb2_idx);
yading@10:     ff_subblock_synthesis(ractx, lpc_coefs, cba_idx, cb1_idx, cb2_idx, rms,
yading@10:                           gain);
yading@10: }
yading@10: 
yading@10: 
yading@10: static int ra144_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
yading@10:                               const AVFrame *frame, int *got_packet_ptr)
yading@10: {
yading@10:     static const uint8_t sizes[LPC_ORDER] = {64, 32, 32, 16, 16, 8, 8, 8, 8, 4};
yading@10:     static const uint8_t bit_sizes[LPC_ORDER] = {6, 5, 5, 4, 4, 3, 3, 3, 3, 2};
yading@10:     RA144Context *ractx = avctx->priv_data;
yading@10:     PutBitContext pb;
yading@10:     int32_t lpc_data[NBLOCKS * BLOCKSIZE];
yading@10:     int32_t lpc_coefs[LPC_ORDER][MAX_LPC_ORDER];
yading@10:     int shift[LPC_ORDER];
yading@10:     int16_t block_coefs[NBLOCKS][LPC_ORDER];
yading@10:     int lpc_refl[LPC_ORDER];    /**< reflection coefficients of the frame */
yading@10:     unsigned int refl_rms[NBLOCKS]; /**< RMS of the reflection coefficients */
yading@10:     const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
yading@10:     int energy = 0;
yading@10:     int i, idx, ret;
yading@10: 
yading@10:     if (ractx->last_frame)
yading@10:         return 0;
yading@10: 
yading@10:     if ((ret = ff_alloc_packet2(avctx, avpkt, FRAMESIZE)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     /**
yading@10:      * Since the LPC coefficients are calculated on a frame centered over the
yading@10:      * fourth subframe, to encode a given frame, data from the next frame is
yading@10:      * needed. In each call to this function, the previous frame (whose data are
yading@10:      * saved in the encoder context) is encoded, and data from the current frame
yading@10:      * are saved in the encoder context to be used in the next function call.
yading@10:      */
yading@10:     for (i = 0; i < (2 * BLOCKSIZE + BLOCKSIZE / 2); i++) {
yading@10:         lpc_data[i] = ractx->curr_block[BLOCKSIZE + BLOCKSIZE / 2 + i];
yading@10:         energy += (lpc_data[i] * lpc_data[i]) >> 4;
yading@10:     }
yading@10:     if (frame) {
yading@10:         int j;
yading@10:         for (j = 0; j < frame->nb_samples && i < NBLOCKS * BLOCKSIZE; i++, j++) {
yading@10:             lpc_data[i] = samples[j] >> 2;
yading@10:             energy += (lpc_data[i] * lpc_data[i]) >> 4;
yading@10:         }
yading@10:     }
yading@10:     if (i < NBLOCKS * BLOCKSIZE)
yading@10:         memset(&lpc_data[i], 0, (NBLOCKS * BLOCKSIZE - i) * sizeof(*lpc_data));
yading@10:     energy = ff_energy_tab[quantize(ff_t_sqrt(energy >> 5) >> 10, ff_energy_tab,
yading@10:                                     32)];
yading@10: 
yading@10:     ff_lpc_calc_coefs(&ractx->lpc_ctx, lpc_data, NBLOCKS * BLOCKSIZE, LPC_ORDER,
yading@10:                       LPC_ORDER, 16, lpc_coefs, shift, FF_LPC_TYPE_LEVINSON,
yading@10:                       0, ORDER_METHOD_EST, 12, 0);
yading@10:     for (i = 0; i < LPC_ORDER; i++)
yading@10:         block_coefs[NBLOCKS - 1][i] = -(lpc_coefs[LPC_ORDER - 1][i] <<
yading@10:                                         (12 - shift[LPC_ORDER - 1]));
yading@10: 
yading@10:     /**
yading@10:      * TODO: apply perceptual weighting of the input speech through bandwidth
yading@10:      * expansion of the LPC filter.
yading@10:      */
yading@10: 
yading@10:     if (ff_eval_refl(lpc_refl, block_coefs[NBLOCKS - 1], avctx)) {
yading@10:         /**
yading@10:          * The filter is unstable: use the coefficients of the previous frame.
yading@10:          */
yading@10:         ff_int_to_int16(block_coefs[NBLOCKS - 1], ractx->lpc_coef[1]);
yading@10:         if (ff_eval_refl(lpc_refl, block_coefs[NBLOCKS - 1], avctx)) {
yading@10:             /* the filter is still unstable. set reflection coeffs to zero. */
yading@10:             memset(lpc_refl, 0, sizeof(lpc_refl));
yading@10:         }
yading@10:     }
yading@10:     init_put_bits(&pb, avpkt->data, avpkt->size);
yading@10:     for (i = 0; i < LPC_ORDER; i++) {
yading@10:         idx = quantize(lpc_refl[i], ff_lpc_refl_cb[i], sizes[i]);
yading@10:         put_bits(&pb, bit_sizes[i], idx);
yading@10:         lpc_refl[i] = ff_lpc_refl_cb[i][idx];
yading@10:     }
yading@10:     ractx->lpc_refl_rms[0] = ff_rms(lpc_refl);
yading@10:     ff_eval_coefs(ractx->lpc_coef[0], lpc_refl);
yading@10:     refl_rms[0] = ff_interp(ractx, block_coefs[0], 1, 1, ractx->old_energy);
yading@10:     refl_rms[1] = ff_interp(ractx, block_coefs[1], 2,
yading@10:                             energy <= ractx->old_energy,
yading@10:                             ff_t_sqrt(energy * ractx->old_energy) >> 12);
yading@10:     refl_rms[2] = ff_interp(ractx, block_coefs[2], 3, 0, energy);
yading@10:     refl_rms[3] = ff_rescale_rms(ractx->lpc_refl_rms[0], energy);
yading@10:     ff_int_to_int16(block_coefs[NBLOCKS - 1], ractx->lpc_coef[0]);
yading@10:     put_bits(&pb, 5, quantize(energy, ff_energy_tab, 32));
yading@10:     for (i = 0; i < NBLOCKS; i++)
yading@10:         ra144_encode_subblock(ractx, ractx->curr_block + i * BLOCKSIZE,
yading@10:                               block_coefs[i], refl_rms[i], &pb);
yading@10:     flush_put_bits(&pb);
yading@10:     ractx->old_energy = energy;
yading@10:     ractx->lpc_refl_rms[1] = ractx->lpc_refl_rms[0];
yading@10:     FFSWAP(unsigned int *, ractx->lpc_coef[0], ractx->lpc_coef[1]);
yading@10: 
yading@10:     /* copy input samples to current block for processing in next call */
yading@10:     i = 0;
yading@10:     if (frame) {
yading@10:         for (; i < frame->nb_samples; i++)
yading@10:             ractx->curr_block[i] = samples[i] >> 2;
yading@10: 
yading@10:         if ((ret = ff_af_queue_add(&ractx->afq, frame)) < 0)
yading@10:             return ret;
yading@10:     } else
yading@10:         ractx->last_frame = 1;
yading@10:     memset(&ractx->curr_block[i], 0,
yading@10:            (NBLOCKS * BLOCKSIZE - i) * sizeof(*ractx->curr_block));
yading@10: 
yading@10:     /* Get the next frame pts/duration */
yading@10:     ff_af_queue_remove(&ractx->afq, avctx->frame_size, &avpkt->pts,
yading@10:                        &avpkt->duration);
yading@10: 
yading@10:     avpkt->size = FRAMESIZE;
yading@10:     *got_packet_ptr = 1;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: 
yading@10: AVCodec ff_ra_144_encoder = {
yading@10:     .name           = "real_144",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_RA_144,
yading@10:     .priv_data_size = sizeof(RA144Context),
yading@10:     .init           = ra144_encode_init,
yading@10:     .encode2        = ra144_encode_frame,
yading@10:     .close          = ra144_encode_close,
yading@10:     .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_SMALL_LAST_FRAME,
yading@10:     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
yading@10:                                                      AV_SAMPLE_FMT_NONE },
yading@10:     .supported_samplerates = (const int[]){ 8000, 0 },
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("RealAudio 1.0 (14.4K)"),
yading@10: };