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-rw-r--r--ffmpeg/libavcodec/qcelpdec.c795
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diff --git a/ffmpeg/libavcodec/qcelpdec.c b/ffmpeg/libavcodec/qcelpdec.c
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--- a/ffmpeg/libavcodec/qcelpdec.c
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-/*
- * QCELP decoder
- * Copyright (c) 2007 Reynaldo H. Verdejo Pinochet
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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,
- * 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
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/**
- * @file
- * QCELP decoder
- * @author Reynaldo H. Verdejo Pinochet
- * @remark FFmpeg merging spearheaded by Kenan Gillet
- * @remark Development mentored by Benjamin Larson
- */
-
-#include <stddef.h>
-
-#include "libavutil/avassert.h"
-#include "libavutil/channel_layout.h"
-#include "libavutil/float_dsp.h"
-#include "avcodec.h"
-#include "internal.h"
-#include "get_bits.h"
-#include "qcelpdata.h"
-#include "celp_filters.h"
-#include "acelp_filters.h"
-#include "acelp_vectors.h"
-#include "lsp.h"
-
-typedef enum {
- I_F_Q = -1, /**< insufficient frame quality */
- SILENCE,
- RATE_OCTAVE,
- RATE_QUARTER,
- RATE_HALF,
- RATE_FULL
-} qcelp_packet_rate;
-
-typedef struct {
- GetBitContext gb;
- qcelp_packet_rate bitrate;
- QCELPFrame frame; /**< unpacked data frame */
-
- uint8_t erasure_count;
- uint8_t octave_count; /**< count the consecutive RATE_OCTAVE frames */
- float prev_lspf[10];
- float predictor_lspf[10];/**< LSP predictor for RATE_OCTAVE and I_F_Q */
- float pitch_synthesis_filter_mem[303];
- float pitch_pre_filter_mem[303];
- float rnd_fir_filter_mem[180];
- float formant_mem[170];
- float last_codebook_gain;
- int prev_g1[2];
- int prev_bitrate;
- float pitch_gain[4];
- uint8_t pitch_lag[4];
- uint16_t first16bits;
- uint8_t warned_buf_mismatch_bitrate;
-
- /* postfilter */
- float postfilter_synth_mem[10];
- float postfilter_agc_mem;
- float postfilter_tilt_mem;
-} QCELPContext;
-
-/**
- * Initialize the speech codec according to the specification.
- *
- * TIA/EIA/IS-733 2.4.9
- */
-static av_cold int qcelp_decode_init(AVCodecContext *avctx)
-{
- QCELPContext *q = avctx->priv_data;
- int i;
-
- avctx->channels = 1;
- avctx->channel_layout = AV_CH_LAYOUT_MONO;
- avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
-
- for (i = 0; i < 10; i++)
- q->prev_lspf[i] = (i + 1) / 11.0;
-
- return 0;
-}
-
-/**
- * Decode the 10 quantized LSP frequencies from the LSPV/LSP
- * transmission codes of any bitrate and check for badly received packets.
- *
- * @param q the context
- * @param lspf line spectral pair frequencies
- *
- * @return 0 on success, -1 if the packet is badly received
- *
- * TIA/EIA/IS-733 2.4.3.2.6.2-2, 2.4.8.7.3
- */
-static int decode_lspf(QCELPContext *q, float *lspf)
-{
- int i;
- float tmp_lspf, smooth, erasure_coeff;
- const float *predictors;
-
- if (q->bitrate == RATE_OCTAVE || q->bitrate == I_F_Q) {
- predictors = q->prev_bitrate != RATE_OCTAVE &&
- q->prev_bitrate != I_F_Q ? q->prev_lspf
- : q->predictor_lspf;
-
- if (q->bitrate == RATE_OCTAVE) {
- q->octave_count++;
-
- for (i = 0; i < 10; i++) {
- q->predictor_lspf[i] =
- lspf[i] = (q->frame.lspv[i] ? QCELP_LSP_SPREAD_FACTOR
- : -QCELP_LSP_SPREAD_FACTOR) +
- predictors[i] * QCELP_LSP_OCTAVE_PREDICTOR +
- (i + 1) * ((1 - QCELP_LSP_OCTAVE_PREDICTOR) / 11);
- }
- smooth = q->octave_count < 10 ? .875 : 0.1;
- } else {
- erasure_coeff = QCELP_LSP_OCTAVE_PREDICTOR;
-
- av_assert2(q->bitrate == I_F_Q);
-
- if (q->erasure_count > 1)
- erasure_coeff *= q->erasure_count < 4 ? 0.9 : 0.7;
-
- for (i = 0; i < 10; i++) {
- q->predictor_lspf[i] =
- lspf[i] = (i + 1) * (1 - erasure_coeff) / 11 +
- erasure_coeff * predictors[i];
- }
- smooth = 0.125;
- }
-
- // Check the stability of the LSP frequencies.
- lspf[0] = FFMAX(lspf[0], QCELP_LSP_SPREAD_FACTOR);
- for (i = 1; i < 10; i++)
- lspf[i] = FFMAX(lspf[i], lspf[i - 1] + QCELP_LSP_SPREAD_FACTOR);
-
- lspf[9] = FFMIN(lspf[9], 1.0 - QCELP_LSP_SPREAD_FACTOR);
- for (i = 9; i > 0; i--)
- lspf[i - 1] = FFMIN(lspf[i - 1], lspf[i] - QCELP_LSP_SPREAD_FACTOR);
-
- // Low-pass filter the LSP frequencies.
- ff_weighted_vector_sumf(lspf, lspf, q->prev_lspf, smooth, 1.0 - smooth, 10);
- } else {
- q->octave_count = 0;
-
- tmp_lspf = 0.0;
- for (i = 0; i < 5; i++) {
- lspf[2 * i + 0] = tmp_lspf += qcelp_lspvq[i][q->frame.lspv[i]][0] * 0.0001;
- lspf[2 * i + 1] = tmp_lspf += qcelp_lspvq[i][q->frame.lspv[i]][1] * 0.0001;
- }
-
- // Check for badly received packets.
- if (q->bitrate == RATE_QUARTER) {
- if (lspf[9] <= .70 || lspf[9] >= .97)
- return -1;
- for (i = 3; i < 10; i++)
- if (fabs(lspf[i] - lspf[i - 2]) < .08)
- return -1;
- } else {
- if (lspf[9] <= .66 || lspf[9] >= .985)
- return -1;
- for (i = 4; i < 10; i++)
- if (fabs(lspf[i] - lspf[i - 4]) < .0931)
- return -1;
- }
- }
- return 0;
-}
-
-/**
- * Convert codebook transmission codes to GAIN and INDEX.
- *
- * @param q the context
- * @param gain array holding the decoded gain
- *
- * TIA/EIA/IS-733 2.4.6.2
- */
-static void decode_gain_and_index(QCELPContext *q, float *gain)
-{
- int i, subframes_count, g1[16];
- float slope;
-
- if (q->bitrate >= RATE_QUARTER) {
- switch (q->bitrate) {
- case RATE_FULL: subframes_count = 16; break;
- case RATE_HALF: subframes_count = 4; break;
- default: subframes_count = 5;
- }
- for (i = 0; i < subframes_count; i++) {
- g1[i] = 4 * q->frame.cbgain[i];
- if (q->bitrate == RATE_FULL && !((i + 1) & 3)) {
- g1[i] += av_clip((g1[i - 1] + g1[i - 2] + g1[i - 3]) / 3 - 6, 0, 32);
- }
-
- gain[i] = qcelp_g12ga[g1[i]];
-
- if (q->frame.cbsign[i]) {
- gain[i] = -gain[i];
- q->frame.cindex[i] = (q->frame.cindex[i] - 89) & 127;
- }
- }
-
- q->prev_g1[0] = g1[i - 2];
- q->prev_g1[1] = g1[i - 1];
- q->last_codebook_gain = qcelp_g12ga[g1[i - 1]];
-
- if (q->bitrate == RATE_QUARTER) {
- // Provide smoothing of the unvoiced excitation energy.
- gain[7] = gain[4];
- gain[6] = 0.4 * gain[3] + 0.6 * gain[4];
- gain[5] = gain[3];
- gain[4] = 0.8 * gain[2] + 0.2 * gain[3];
- gain[3] = 0.2 * gain[1] + 0.8 * gain[2];
- gain[2] = gain[1];
- gain[1] = 0.6 * gain[0] + 0.4 * gain[1];
- }
- } else if (q->bitrate != SILENCE) {
- if (q->bitrate == RATE_OCTAVE) {
- g1[0] = 2 * q->frame.cbgain[0] +
- av_clip((q->prev_g1[0] + q->prev_g1[1]) / 2 - 5, 0, 54);
- subframes_count = 8;
- } else {
- av_assert2(q->bitrate == I_F_Q);
-
- g1[0] = q->prev_g1[1];
- switch (q->erasure_count) {
- case 1 : break;
- case 2 : g1[0] -= 1; break;
- case 3 : g1[0] -= 2; break;
- default: g1[0] -= 6;
- }
- if (g1[0] < 0)
- g1[0] = 0;
- subframes_count = 4;
- }
- // This interpolation is done to produce smoother background noise.
- slope = 0.5 * (qcelp_g12ga[g1[0]] - q->last_codebook_gain) / subframes_count;
- for (i = 1; i <= subframes_count; i++)
- gain[i - 1] = q->last_codebook_gain + slope * i;
-
- q->last_codebook_gain = gain[i - 2];
- q->prev_g1[0] = q->prev_g1[1];
- q->prev_g1[1] = g1[0];
- }
-}
-
-/**
- * If the received packet is Rate 1/4 a further sanity check is made of the
- * codebook gain.
- *
- * @param cbgain the unpacked cbgain array
- * @return -1 if the sanity check fails, 0 otherwise
- *
- * TIA/EIA/IS-733 2.4.8.7.3
- */
-static int codebook_sanity_check_for_rate_quarter(const uint8_t *cbgain)
-{
- int i, diff, prev_diff = 0;
-
- for (i = 1; i < 5; i++) {
- diff = cbgain[i] - cbgain[i-1];
- if (FFABS(diff) > 10)
- return -1;
- else if (FFABS(diff - prev_diff) > 12)
- return -1;
- prev_diff = diff;
- }
- return 0;
-}
-
-/**
- * Compute the scaled codebook vector Cdn From INDEX and GAIN
- * for all rates.
- *
- * The specification lacks some information here.
- *
- * TIA/EIA/IS-733 has an omission on the codebook index determination
- * formula for RATE_FULL and RATE_HALF frames at section 2.4.8.1.1. It says
- * you have to subtract the decoded index parameter from the given scaled
- * codebook vector index 'n' to get the desired circular codebook index, but
- * it does not mention that you have to clamp 'n' to [0-9] in order to get
- * RI-compliant results.
- *
- * The reason for this mistake seems to be the fact they forgot to mention you
- * have to do these calculations per codebook subframe and adjust given
- * equation values accordingly.
- *
- * @param q the context
- * @param gain array holding the 4 pitch subframe gain values
- * @param cdn_vector array for the generated scaled codebook vector
- */
-static void compute_svector(QCELPContext *q, const float *gain,
- float *cdn_vector)
-{
- int i, j, k;
- uint16_t cbseed, cindex;
- float *rnd, tmp_gain, fir_filter_value;
-
- switch (q->bitrate) {
- case RATE_FULL:
- for (i = 0; i < 16; i++) {
- tmp_gain = gain[i] * QCELP_RATE_FULL_CODEBOOK_RATIO;
- cindex = -q->frame.cindex[i];
- for (j = 0; j < 10; j++)
- *cdn_vector++ = tmp_gain * qcelp_rate_full_codebook[cindex++ & 127];
- }
- break;
- case RATE_HALF:
- for (i = 0; i < 4; i++) {
- tmp_gain = gain[i] * QCELP_RATE_HALF_CODEBOOK_RATIO;
- cindex = -q->frame.cindex[i];
- for (j = 0; j < 40; j++)
- *cdn_vector++ = tmp_gain * qcelp_rate_half_codebook[cindex++ & 127];
- }
- break;
- case RATE_QUARTER:
- cbseed = (0x0003 & q->frame.lspv[4]) << 14 |
- (0x003F & q->frame.lspv[3]) << 8 |
- (0x0060 & q->frame.lspv[2]) << 1 |
- (0x0007 & q->frame.lspv[1]) << 3 |
- (0x0038 & q->frame.lspv[0]) >> 3;
- rnd = q->rnd_fir_filter_mem + 20;
- for (i = 0; i < 8; i++) {
- tmp_gain = gain[i] * (QCELP_SQRT1887 / 32768.0);
- for (k = 0; k < 20; k++) {
- cbseed = 521 * cbseed + 259;
- *rnd = (int16_t) cbseed;
-
- // FIR filter
- fir_filter_value = 0.0;
- for (j = 0; j < 10; j++)
- fir_filter_value += qcelp_rnd_fir_coefs[j] *
- (rnd[-j] + rnd[-20+j]);
-
- fir_filter_value += qcelp_rnd_fir_coefs[10] * rnd[-10];
- *cdn_vector++ = tmp_gain * fir_filter_value;
- rnd++;
- }
- }
- memcpy(q->rnd_fir_filter_mem, q->rnd_fir_filter_mem + 160,
- 20 * sizeof(float));
- break;
- case RATE_OCTAVE:
- cbseed = q->first16bits;
- for (i = 0; i < 8; i++) {
- tmp_gain = gain[i] * (QCELP_SQRT1887 / 32768.0);
- for (j = 0; j < 20; j++) {
- cbseed = 521 * cbseed + 259;
- *cdn_vector++ = tmp_gain * (int16_t) cbseed;
- }
- }
- break;
- case I_F_Q:
- cbseed = -44; // random codebook index
- for (i = 0; i < 4; i++) {
- tmp_gain = gain[i] * QCELP_RATE_FULL_CODEBOOK_RATIO;
- for (j = 0; j < 40; j++)
- *cdn_vector++ = tmp_gain * qcelp_rate_full_codebook[cbseed++ & 127];
- }
- break;
- case SILENCE:
- memset(cdn_vector, 0, 160 * sizeof(float));
- break;
- }
-}
-
-/**
- * Apply generic gain control.
- *
- * @param v_out output vector
- * @param v_in gain-controlled vector
- * @param v_ref vector to control gain of
- *
- * TIA/EIA/IS-733 2.4.8.3, 2.4.8.6
- */
-static void apply_gain_ctrl(float *v_out, const float *v_ref, const float *v_in)
-{
- int i;
-
- for (i = 0; i < 160; i += 40) {
- float res = avpriv_scalarproduct_float_c(v_ref + i, v_ref + i, 40);
- ff_scale_vector_to_given_sum_of_squares(v_out + i, v_in + i, res, 40);
- }
-}
-
-/**
- * Apply filter in pitch-subframe steps.
- *
- * @param memory buffer for the previous state of the filter
- * - must be able to contain 303 elements
- * - the 143 first elements are from the previous state
- * - the next 160 are for output
- * @param v_in input filter vector
- * @param gain per-subframe gain array, each element is between 0.0 and 2.0
- * @param lag per-subframe lag array, each element is
- * - between 16 and 143 if its corresponding pfrac is 0,
- * - between 16 and 139 otherwise
- * @param pfrac per-subframe boolean array, 1 if the lag is fractional, 0
- * otherwise
- *
- * @return filter output vector
- */
-static const float *do_pitchfilter(float memory[303], const float v_in[160],
- const float gain[4], const uint8_t *lag,
- const uint8_t pfrac[4])
-{
- int i, j;
- float *v_lag, *v_out;
- const float *v_len;
-
- v_out = memory + 143; // Output vector starts at memory[143].
-
- for (i = 0; i < 4; i++) {
- if (gain[i]) {
- v_lag = memory + 143 + 40 * i - lag[i];
- for (v_len = v_in + 40; v_in < v_len; v_in++) {
- if (pfrac[i]) { // If it is a fractional lag...
- for (j = 0, *v_out = 0.0; j < 4; j++)
- *v_out += qcelp_hammsinc_table[j] * (v_lag[j - 4] + v_lag[3 - j]);
- } else
- *v_out = *v_lag;
-
- *v_out = *v_in + gain[i] * *v_out;
-
- v_lag++;
- v_out++;
- }
- } else {
- memcpy(v_out, v_in, 40 * sizeof(float));
- v_in += 40;
- v_out += 40;
- }
- }
-
- memmove(memory, memory + 160, 143 * sizeof(float));
- return memory + 143;
-}
-
-/**
- * Apply pitch synthesis filter and pitch prefilter to the scaled codebook vector.
- * TIA/EIA/IS-733 2.4.5.2, 2.4.8.7.2
- *
- * @param q the context
- * @param cdn_vector the scaled codebook vector
- */
-static void apply_pitch_filters(QCELPContext *q, float *cdn_vector)
-{
- int i;
- const float *v_synthesis_filtered, *v_pre_filtered;
-
- if (q->bitrate >= RATE_HALF || q->bitrate == SILENCE ||
- (q->bitrate == I_F_Q && (q->prev_bitrate >= RATE_HALF))) {
-
- if (q->bitrate >= RATE_HALF) {
- // Compute gain & lag for the whole frame.
- for (i = 0; i < 4; i++) {
- q->pitch_gain[i] = q->frame.plag[i] ? (q->frame.pgain[i] + 1) * 0.25 : 0.0;
-
- q->pitch_lag[i] = q->frame.plag[i] + 16;
- }
- } else {
- float max_pitch_gain;
-
- if (q->bitrate == I_F_Q) {
- if (q->erasure_count < 3)
- max_pitch_gain = 0.9 - 0.3 * (q->erasure_count - 1);
- else
- max_pitch_gain = 0.0;
- } else {
- av_assert2(q->bitrate == SILENCE);
- max_pitch_gain = 1.0;
- }
- for (i = 0; i < 4; i++)
- q->pitch_gain[i] = FFMIN(q->pitch_gain[i], max_pitch_gain);
-
- memset(q->frame.pfrac, 0, sizeof(q->frame.pfrac));
- }
-
- // pitch synthesis filter
- v_synthesis_filtered = do_pitchfilter(q->pitch_synthesis_filter_mem,
- cdn_vector, q->pitch_gain,
- q->pitch_lag, q->frame.pfrac);
-
- // pitch prefilter update
- for (i = 0; i < 4; i++)
- q->pitch_gain[i] = 0.5 * FFMIN(q->pitch_gain[i], 1.0);
-
- v_pre_filtered = do_pitchfilter(q->pitch_pre_filter_mem,
- v_synthesis_filtered,
- q->pitch_gain, q->pitch_lag,
- q->frame.pfrac);
-
- apply_gain_ctrl(cdn_vector, v_synthesis_filtered, v_pre_filtered);
- } else {
- memcpy(q->pitch_synthesis_filter_mem, cdn_vector + 17, 143 * sizeof(float));
- memcpy(q->pitch_pre_filter_mem, cdn_vector + 17, 143 * sizeof(float));
- memset(q->pitch_gain, 0, sizeof(q->pitch_gain));
- memset(q->pitch_lag, 0, sizeof(q->pitch_lag));
- }
-}
-
-/**
- * Reconstruct LPC coefficients from the line spectral pair frequencies
- * and perform bandwidth expansion.
- *
- * @param lspf line spectral pair frequencies
- * @param lpc linear predictive coding coefficients
- *
- * @note: bandwidth_expansion_coeff could be precalculated into a table
- * but it seems to be slower on x86
- *
- * TIA/EIA/IS-733 2.4.3.3.5
- */
-static void lspf2lpc(const float *lspf, float *lpc)
-{
- double lsp[10];
- double bandwidth_expansion_coeff = QCELP_BANDWIDTH_EXPANSION_COEFF;
- int i;
-
- for (i = 0; i < 10; i++)
- lsp[i] = cos(M_PI * lspf[i]);
-
- ff_acelp_lspd2lpc(lsp, lpc, 5);
-
- for (i = 0; i < 10; i++) {
- lpc[i] *= bandwidth_expansion_coeff;
- bandwidth_expansion_coeff *= QCELP_BANDWIDTH_EXPANSION_COEFF;
- }
-}
-
-/**
- * Interpolate LSP frequencies and compute LPC coefficients
- * for a given bitrate & pitch subframe.
- *
- * TIA/EIA/IS-733 2.4.3.3.4, 2.4.8.7.2
- *
- * @param q the context
- * @param curr_lspf LSP frequencies vector of the current frame
- * @param lpc float vector for the resulting LPC
- * @param subframe_num frame number in decoded stream
- */
-static void interpolate_lpc(QCELPContext *q, const float *curr_lspf,
- float *lpc, const int subframe_num)
-{
- float interpolated_lspf[10];
- float weight;
-
- if (q->bitrate >= RATE_QUARTER)
- weight = 0.25 * (subframe_num + 1);
- else if (q->bitrate == RATE_OCTAVE && !subframe_num)
- weight = 0.625;
- else
- weight = 1.0;
-
- if (weight != 1.0) {
- ff_weighted_vector_sumf(interpolated_lspf, curr_lspf, q->prev_lspf,
- weight, 1.0 - weight, 10);
- lspf2lpc(interpolated_lspf, lpc);
- } else if (q->bitrate >= RATE_QUARTER ||
- (q->bitrate == I_F_Q && !subframe_num))
- lspf2lpc(curr_lspf, lpc);
- else if (q->bitrate == SILENCE && !subframe_num)
- lspf2lpc(q->prev_lspf, lpc);
-}
-
-static qcelp_packet_rate buf_size2bitrate(const int buf_size)
-{
- switch (buf_size) {
- case 35: return RATE_FULL;
- case 17: return RATE_HALF;
- case 8: return RATE_QUARTER;
- case 4: return RATE_OCTAVE;
- case 1: return SILENCE;
- }
-
- return I_F_Q;
-}
-
-/**
- * Determine the bitrate from the frame size and/or the first byte of the frame.
- *
- * @param avctx the AV codec context
- * @param buf_size length of the buffer
- * @param buf the bufffer
- *
- * @return the bitrate on success,
- * I_F_Q if the bitrate cannot be satisfactorily determined
- *
- * TIA/EIA/IS-733 2.4.8.7.1
- */
-static qcelp_packet_rate determine_bitrate(AVCodecContext *avctx,
- const int buf_size,
- const uint8_t **buf)
-{
- qcelp_packet_rate bitrate;
-
- if ((bitrate = buf_size2bitrate(buf_size)) >= 0) {
- if (bitrate > **buf) {
- QCELPContext *q = avctx->priv_data;
- if (!q->warned_buf_mismatch_bitrate) {
- av_log(avctx, AV_LOG_WARNING,
- "Claimed bitrate and buffer size mismatch.\n");
- q->warned_buf_mismatch_bitrate = 1;
- }
- bitrate = **buf;
- } else if (bitrate < **buf) {
- av_log(avctx, AV_LOG_ERROR,
- "Buffer is too small for the claimed bitrate.\n");
- return I_F_Q;
- }
- (*buf)++;
- } else if ((bitrate = buf_size2bitrate(buf_size + 1)) >= 0) {
- av_log(avctx, AV_LOG_WARNING,
- "Bitrate byte is missing, guessing the bitrate from packet size.\n");
- } else
- return I_F_Q;
-
- if (bitrate == SILENCE) {
- // FIXME: Remove this warning when tested with samples.
- avpriv_request_sample(avctx, "Blank frame handling");
- }
- return bitrate;
-}
-
-static void warn_insufficient_frame_quality(AVCodecContext *avctx,
- const char *message)
-{
- av_log(avctx, AV_LOG_WARNING, "Frame #%d, IFQ: %s\n",
- avctx->frame_number, message);
-}
-
-static void postfilter(QCELPContext *q, float *samples, float *lpc)
-{
- static const float pow_0_775[10] = {
- 0.775000, 0.600625, 0.465484, 0.360750, 0.279582,
- 0.216676, 0.167924, 0.130141, 0.100859, 0.078166
- }, pow_0_625[10] = {
- 0.625000, 0.390625, 0.244141, 0.152588, 0.095367,
- 0.059605, 0.037253, 0.023283, 0.014552, 0.009095
- };
- float lpc_s[10], lpc_p[10], pole_out[170], zero_out[160];
- int n;
-
- for (n = 0; n < 10; n++) {
- lpc_s[n] = lpc[n] * pow_0_625[n];
- lpc_p[n] = lpc[n] * pow_0_775[n];
- }
-
- ff_celp_lp_zero_synthesis_filterf(zero_out, lpc_s,
- q->formant_mem + 10, 160, 10);
- memcpy(pole_out, q->postfilter_synth_mem, sizeof(float) * 10);
- ff_celp_lp_synthesis_filterf(pole_out + 10, lpc_p, zero_out, 160, 10);
- memcpy(q->postfilter_synth_mem, pole_out + 160, sizeof(float) * 10);
-
- ff_tilt_compensation(&q->postfilter_tilt_mem, 0.3, pole_out + 10, 160);
-
- ff_adaptive_gain_control(samples, pole_out + 10,
- avpriv_scalarproduct_float_c(q->formant_mem + 10,
- q->formant_mem + 10,
- 160),
- 160, 0.9375, &q->postfilter_agc_mem);
-}
-
-static int qcelp_decode_frame(AVCodecContext *avctx, void *data,
- int *got_frame_ptr, AVPacket *avpkt)
-{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- QCELPContext *q = avctx->priv_data;
- AVFrame *frame = data;
- float *outbuffer;
- int i, ret;
- float quantized_lspf[10], lpc[10];
- float gain[16];
- float *formant_mem;
-
- /* get output buffer */
- frame->nb_samples = 160;
- if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
- return ret;
- outbuffer = (float *)frame->data[0];
-
- if ((q->bitrate = determine_bitrate(avctx, buf_size, &buf)) == I_F_Q) {
- warn_insufficient_frame_quality(avctx, "bitrate cannot be determined.");
- goto erasure;
- }
-
- if (q->bitrate == RATE_OCTAVE &&
- (q->first16bits = AV_RB16(buf)) == 0xFFFF) {
- warn_insufficient_frame_quality(avctx, "Bitrate is 1/8 and first 16 bits are on.");
- goto erasure;
- }
-
- if (q->bitrate > SILENCE) {
- const QCELPBitmap *bitmaps = qcelp_unpacking_bitmaps_per_rate[q->bitrate];
- const QCELPBitmap *bitmaps_end = qcelp_unpacking_bitmaps_per_rate[q->bitrate] +
- qcelp_unpacking_bitmaps_lengths[q->bitrate];
- uint8_t *unpacked_data = (uint8_t *)&q->frame;
-
- init_get_bits(&q->gb, buf, 8 * buf_size);
-
- memset(&q->frame, 0, sizeof(QCELPFrame));
-
- for (; bitmaps < bitmaps_end; bitmaps++)
- unpacked_data[bitmaps->index] |= get_bits(&q->gb, bitmaps->bitlen) << bitmaps->bitpos;
-
- // Check for erasures/blanks on rates 1, 1/4 and 1/8.
- if (q->frame.reserved) {
- warn_insufficient_frame_quality(avctx, "Wrong data in reserved frame area.");
- goto erasure;
- }
- if (q->bitrate == RATE_QUARTER &&
- codebook_sanity_check_for_rate_quarter(q->frame.cbgain)) {
- warn_insufficient_frame_quality(avctx, "Codebook gain sanity check failed.");
- goto erasure;
- }
-
- if (q->bitrate >= RATE_HALF) {
- for (i = 0; i < 4; i++) {
- if (q->frame.pfrac[i] && q->frame.plag[i] >= 124) {
- warn_insufficient_frame_quality(avctx, "Cannot initialize pitch filter.");
- goto erasure;
- }
- }
- }
- }
-
- decode_gain_and_index(q, gain);
- compute_svector(q, gain, outbuffer);
-
- if (decode_lspf(q, quantized_lspf) < 0) {
- warn_insufficient_frame_quality(avctx, "Badly received packets in frame.");
- goto erasure;
- }
-
- apply_pitch_filters(q, outbuffer);
-
- if (q->bitrate == I_F_Q) {
-erasure:
- q->bitrate = I_F_Q;
- q->erasure_count++;
- decode_gain_and_index(q, gain);
- compute_svector(q, gain, outbuffer);
- decode_lspf(q, quantized_lspf);
- apply_pitch_filters(q, outbuffer);
- } else
- q->erasure_count = 0;
-
- formant_mem = q->formant_mem + 10;
- for (i = 0; i < 4; i++) {
- interpolate_lpc(q, quantized_lspf, lpc, i);
- ff_celp_lp_synthesis_filterf(formant_mem, lpc, outbuffer + i * 40, 40, 10);
- formant_mem += 40;
- }
-
- // postfilter, as per TIA/EIA/IS-733 2.4.8.6
- postfilter(q, outbuffer, lpc);
-
- memcpy(q->formant_mem, q->formant_mem + 160, 10 * sizeof(float));
-
- memcpy(q->prev_lspf, quantized_lspf, sizeof(q->prev_lspf));
- q->prev_bitrate = q->bitrate;
-
- *got_frame_ptr = 1;
-
- return buf_size;
-}
-
-AVCodec ff_qcelp_decoder = {
- .name = "qcelp",
- .long_name = NULL_IF_CONFIG_SMALL("QCELP / PureVoice"),
- .type = AVMEDIA_TYPE_AUDIO,
- .id = AV_CODEC_ID_QCELP,
- .init = qcelp_decode_init,
- .decode = qcelp_decode_frame,
- .capabilities = CODEC_CAP_DR1,
- .priv_data_size = sizeof(QCELPContext),
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 13:16:46 +0000