yading@10: /* yading@10: * SIPR / ACELP.NET decoder yading@10: * yading@10: * Copyright (c) 2008 Vladimir Voroshilov yading@10: * Copyright (c) 2009 Vitor Sessak 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: #include yading@10: #include yading@10: #include yading@10: yading@10: #include "libavutil/channel_layout.h" yading@10: #include "libavutil/float_dsp.h" yading@10: #include "libavutil/mathematics.h" yading@10: #include "avcodec.h" yading@10: #define BITSTREAM_READER_LE yading@10: #include "get_bits.h" yading@10: #include "internal.h" yading@10: yading@10: #include "lsp.h" yading@10: #include "acelp_vectors.h" yading@10: #include "acelp_pitch_delay.h" yading@10: #include "acelp_filters.h" yading@10: #include "celp_filters.h" yading@10: yading@10: #define MAX_SUBFRAME_COUNT 5 yading@10: yading@10: #include "sipr.h" yading@10: #include "siprdata.h" yading@10: yading@10: typedef struct { yading@10: const char *mode_name; yading@10: uint16_t bits_per_frame; yading@10: uint8_t subframe_count; yading@10: uint8_t frames_per_packet; yading@10: float pitch_sharp_factor; yading@10: yading@10: /* bitstream parameters */ yading@10: uint8_t number_of_fc_indexes; yading@10: uint8_t ma_predictor_bits; ///< size in bits of the switched MA predictor yading@10: yading@10: /** size in bits of the i-th stage vector of quantizer */ yading@10: uint8_t vq_indexes_bits[5]; yading@10: yading@10: /** size in bits of the adaptive-codebook index for every subframe */ yading@10: uint8_t pitch_delay_bits[5]; yading@10: yading@10: uint8_t gp_index_bits; yading@10: uint8_t fc_index_bits[10]; ///< size in bits of the fixed codebook indexes yading@10: uint8_t gc_index_bits; ///< size in bits of the gain codebook indexes yading@10: } SiprModeParam; yading@10: yading@10: static const SiprModeParam modes[MODE_COUNT] = { yading@10: [MODE_16k] = { yading@10: .mode_name = "16k", yading@10: .bits_per_frame = 160, yading@10: .subframe_count = SUBFRAME_COUNT_16k, yading@10: .frames_per_packet = 1, yading@10: .pitch_sharp_factor = 0.00, yading@10: yading@10: .number_of_fc_indexes = 10, yading@10: .ma_predictor_bits = 1, yading@10: .vq_indexes_bits = {7, 8, 7, 7, 7}, yading@10: .pitch_delay_bits = {9, 6}, yading@10: .gp_index_bits = 4, yading@10: .fc_index_bits = {4, 5, 4, 5, 4, 5, 4, 5, 4, 5}, yading@10: .gc_index_bits = 5 yading@10: }, yading@10: yading@10: [MODE_8k5] = { yading@10: .mode_name = "8k5", yading@10: .bits_per_frame = 152, yading@10: .subframe_count = 3, yading@10: .frames_per_packet = 1, yading@10: .pitch_sharp_factor = 0.8, yading@10: yading@10: .number_of_fc_indexes = 3, yading@10: .ma_predictor_bits = 0, yading@10: .vq_indexes_bits = {6, 7, 7, 7, 5}, yading@10: .pitch_delay_bits = {8, 5, 5}, yading@10: .gp_index_bits = 0, yading@10: .fc_index_bits = {9, 9, 9}, yading@10: .gc_index_bits = 7 yading@10: }, yading@10: yading@10: [MODE_6k5] = { yading@10: .mode_name = "6k5", yading@10: .bits_per_frame = 232, yading@10: .subframe_count = 3, yading@10: .frames_per_packet = 2, yading@10: .pitch_sharp_factor = 0.8, yading@10: yading@10: .number_of_fc_indexes = 3, yading@10: .ma_predictor_bits = 0, yading@10: .vq_indexes_bits = {6, 7, 7, 7, 5}, yading@10: .pitch_delay_bits = {8, 5, 5}, yading@10: .gp_index_bits = 0, yading@10: .fc_index_bits = {5, 5, 5}, yading@10: .gc_index_bits = 7 yading@10: }, yading@10: yading@10: [MODE_5k0] = { yading@10: .mode_name = "5k0", yading@10: .bits_per_frame = 296, yading@10: .subframe_count = 5, yading@10: .frames_per_packet = 2, yading@10: .pitch_sharp_factor = 0.85, yading@10: yading@10: .number_of_fc_indexes = 1, yading@10: .ma_predictor_bits = 0, yading@10: .vq_indexes_bits = {6, 7, 7, 7, 5}, yading@10: .pitch_delay_bits = {8, 5, 8, 5, 5}, yading@10: .gp_index_bits = 0, yading@10: .fc_index_bits = {10}, yading@10: .gc_index_bits = 7 yading@10: } yading@10: }; yading@10: yading@10: const float ff_pow_0_5[] = { yading@10: 1.0/(1 << 1), 1.0/(1 << 2), 1.0/(1 << 3), 1.0/(1 << 4), yading@10: 1.0/(1 << 5), 1.0/(1 << 6), 1.0/(1 << 7), 1.0/(1 << 8), yading@10: 1.0/(1 << 9), 1.0/(1 << 10), 1.0/(1 << 11), 1.0/(1 << 12), yading@10: 1.0/(1 << 13), 1.0/(1 << 14), 1.0/(1 << 15), 1.0/(1 << 16) yading@10: }; yading@10: yading@10: static void dequant(float *out, const int *idx, const float *cbs[]) yading@10: { yading@10: int i; yading@10: int stride = 2; yading@10: int num_vec = 5; yading@10: yading@10: for (i = 0; i < num_vec; i++) yading@10: memcpy(out + stride*i, cbs[i] + stride*idx[i], stride*sizeof(float)); yading@10: yading@10: } yading@10: yading@10: static void lsf_decode_fp(float *lsfnew, float *lsf_history, yading@10: const SiprParameters *parm) yading@10: { yading@10: int i; yading@10: float lsf_tmp[LP_FILTER_ORDER]; yading@10: yading@10: dequant(lsf_tmp, parm->vq_indexes, lsf_codebooks); yading@10: yading@10: for (i = 0; i < LP_FILTER_ORDER; i++) yading@10: lsfnew[i] = lsf_history[i] * 0.33 + lsf_tmp[i] + mean_lsf[i]; yading@10: yading@10: ff_sort_nearly_sorted_floats(lsfnew, LP_FILTER_ORDER - 1); yading@10: yading@10: /* Note that a minimum distance is not enforced between the last value and yading@10: the previous one, contrary to what is done in ff_acelp_reorder_lsf() */ yading@10: ff_set_min_dist_lsf(lsfnew, LSFQ_DIFF_MIN, LP_FILTER_ORDER - 1); yading@10: lsfnew[9] = FFMIN(lsfnew[LP_FILTER_ORDER - 1], 1.3 * M_PI); yading@10: yading@10: memcpy(lsf_history, lsf_tmp, LP_FILTER_ORDER * sizeof(*lsf_history)); yading@10: yading@10: for (i = 0; i < LP_FILTER_ORDER - 1; i++) yading@10: lsfnew[i] = cos(lsfnew[i]); yading@10: lsfnew[LP_FILTER_ORDER - 1] *= 6.153848 / M_PI; yading@10: } yading@10: yading@10: /** Apply pitch lag to the fixed vector (AMR section 6.1.2). */ yading@10: static void pitch_sharpening(int pitch_lag_int, float beta, yading@10: float *fixed_vector) yading@10: { yading@10: int i; yading@10: yading@10: for (i = pitch_lag_int; i < SUBFR_SIZE; i++) yading@10: fixed_vector[i] += beta * fixed_vector[i - pitch_lag_int]; yading@10: } yading@10: yading@10: /** yading@10: * Extract decoding parameters from the input bitstream. yading@10: * @param parms parameters structure yading@10: * @param pgb pointer to initialized GetBitContext structure yading@10: */ yading@10: static void decode_parameters(SiprParameters* parms, GetBitContext *pgb, yading@10: const SiprModeParam *p) yading@10: { yading@10: int i, j; yading@10: yading@10: if (p->ma_predictor_bits) yading@10: parms->ma_pred_switch = get_bits(pgb, p->ma_predictor_bits); yading@10: yading@10: for (i = 0; i < 5; i++) yading@10: parms->vq_indexes[i] = get_bits(pgb, p->vq_indexes_bits[i]); yading@10: yading@10: for (i = 0; i < p->subframe_count; i++) { yading@10: parms->pitch_delay[i] = get_bits(pgb, p->pitch_delay_bits[i]); yading@10: if (p->gp_index_bits) yading@10: parms->gp_index[i] = get_bits(pgb, p->gp_index_bits); yading@10: yading@10: for (j = 0; j < p->number_of_fc_indexes; j++) yading@10: parms->fc_indexes[i][j] = get_bits(pgb, p->fc_index_bits[j]); yading@10: yading@10: parms->gc_index[i] = get_bits(pgb, p->gc_index_bits); yading@10: } yading@10: } yading@10: yading@10: static void sipr_decode_lp(float *lsfnew, const float *lsfold, float *Az, yading@10: int num_subfr) yading@10: { yading@10: double lsfint[LP_FILTER_ORDER]; yading@10: int i,j; yading@10: float t, t0 = 1.0 / num_subfr; yading@10: yading@10: t = t0 * 0.5; yading@10: for (i = 0; i < num_subfr; i++) { yading@10: for (j = 0; j < LP_FILTER_ORDER; j++) yading@10: lsfint[j] = lsfold[j] * (1 - t) + t * lsfnew[j]; yading@10: yading@10: ff_amrwb_lsp2lpc(lsfint, Az, LP_FILTER_ORDER); yading@10: Az += LP_FILTER_ORDER; yading@10: t += t0; yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Evaluate the adaptive impulse response. yading@10: */ yading@10: static void eval_ir(const float *Az, int pitch_lag, float *freq, yading@10: float pitch_sharp_factor) yading@10: { yading@10: float tmp1[SUBFR_SIZE+1], tmp2[LP_FILTER_ORDER+1]; yading@10: int i; yading@10: yading@10: tmp1[0] = 1.; yading@10: for (i = 0; i < LP_FILTER_ORDER; i++) { yading@10: tmp1[i+1] = Az[i] * ff_pow_0_55[i]; yading@10: tmp2[i ] = Az[i] * ff_pow_0_7 [i]; yading@10: } yading@10: memset(tmp1 + 11, 0, 37 * sizeof(float)); yading@10: yading@10: ff_celp_lp_synthesis_filterf(freq, tmp2, tmp1, SUBFR_SIZE, yading@10: LP_FILTER_ORDER); yading@10: yading@10: pitch_sharpening(pitch_lag, pitch_sharp_factor, freq); yading@10: } yading@10: yading@10: /** yading@10: * Evaluate the convolution of a vector with a sparse vector. yading@10: */ yading@10: static void convolute_with_sparse(float *out, const AMRFixed *pulses, yading@10: const float *shape, int length) yading@10: { yading@10: int i, j; yading@10: yading@10: memset(out, 0, length*sizeof(float)); yading@10: for (i = 0; i < pulses->n; i++) yading@10: for (j = pulses->x[i]; j < length; j++) yading@10: out[j] += pulses->y[i] * shape[j - pulses->x[i]]; yading@10: } yading@10: yading@10: /** yading@10: * Apply postfilter, very similar to AMR one. yading@10: */ yading@10: static void postfilter_5k0(SiprContext *ctx, const float *lpc, float *samples) yading@10: { yading@10: float buf[SUBFR_SIZE + LP_FILTER_ORDER]; yading@10: float *pole_out = buf + LP_FILTER_ORDER; yading@10: float lpc_n[LP_FILTER_ORDER]; yading@10: float lpc_d[LP_FILTER_ORDER]; yading@10: int i; yading@10: yading@10: for (i = 0; i < LP_FILTER_ORDER; i++) { yading@10: lpc_d[i] = lpc[i] * ff_pow_0_75[i]; yading@10: lpc_n[i] = lpc[i] * ff_pow_0_5 [i]; yading@10: }; yading@10: yading@10: memcpy(pole_out - LP_FILTER_ORDER, ctx->postfilter_mem, yading@10: LP_FILTER_ORDER*sizeof(float)); yading@10: yading@10: ff_celp_lp_synthesis_filterf(pole_out, lpc_d, samples, SUBFR_SIZE, yading@10: LP_FILTER_ORDER); yading@10: yading@10: memcpy(ctx->postfilter_mem, pole_out + SUBFR_SIZE - LP_FILTER_ORDER, yading@10: LP_FILTER_ORDER*sizeof(float)); yading@10: yading@10: ff_tilt_compensation(&ctx->tilt_mem, 0.4, pole_out, SUBFR_SIZE); yading@10: yading@10: memcpy(pole_out - LP_FILTER_ORDER, ctx->postfilter_mem5k0, yading@10: LP_FILTER_ORDER*sizeof(*pole_out)); yading@10: yading@10: memcpy(ctx->postfilter_mem5k0, pole_out + SUBFR_SIZE - LP_FILTER_ORDER, yading@10: LP_FILTER_ORDER*sizeof(*pole_out)); yading@10: yading@10: ff_celp_lp_zero_synthesis_filterf(samples, lpc_n, pole_out, SUBFR_SIZE, yading@10: LP_FILTER_ORDER); yading@10: yading@10: } yading@10: yading@10: static void decode_fixed_sparse(AMRFixed *fixed_sparse, const int16_t *pulses, yading@10: SiprMode mode, int low_gain) yading@10: { yading@10: int i; yading@10: yading@10: switch (mode) { yading@10: case MODE_6k5: yading@10: for (i = 0; i < 3; i++) { yading@10: fixed_sparse->x[i] = 3 * (pulses[i] & 0xf) + i; yading@10: fixed_sparse->y[i] = pulses[i] & 0x10 ? -1 : 1; yading@10: } yading@10: fixed_sparse->n = 3; yading@10: break; yading@10: case MODE_8k5: yading@10: for (i = 0; i < 3; i++) { yading@10: fixed_sparse->x[2*i ] = 3 * ((pulses[i] >> 4) & 0xf) + i; yading@10: fixed_sparse->x[2*i + 1] = 3 * ( pulses[i] & 0xf) + i; yading@10: yading@10: fixed_sparse->y[2*i ] = (pulses[i] & 0x100) ? -1.0: 1.0; yading@10: yading@10: fixed_sparse->y[2*i + 1] = yading@10: (fixed_sparse->x[2*i + 1] < fixed_sparse->x[2*i]) ? yading@10: -fixed_sparse->y[2*i ] : fixed_sparse->y[2*i]; yading@10: } yading@10: yading@10: fixed_sparse->n = 6; yading@10: break; yading@10: case MODE_5k0: yading@10: default: yading@10: if (low_gain) { yading@10: int offset = (pulses[0] & 0x200) ? 2 : 0; yading@10: int val = pulses[0]; yading@10: yading@10: for (i = 0; i < 3; i++) { yading@10: int index = (val & 0x7) * 6 + 4 - i*2; yading@10: yading@10: fixed_sparse->y[i] = (offset + index) & 0x3 ? -1 : 1; yading@10: fixed_sparse->x[i] = index; yading@10: yading@10: val >>= 3; yading@10: } yading@10: fixed_sparse->n = 3; yading@10: } else { yading@10: int pulse_subset = (pulses[0] >> 8) & 1; yading@10: yading@10: fixed_sparse->x[0] = ((pulses[0] >> 4) & 15) * 3 + pulse_subset; yading@10: fixed_sparse->x[1] = ( pulses[0] & 15) * 3 + pulse_subset + 1; yading@10: yading@10: fixed_sparse->y[0] = pulses[0] & 0x200 ? -1 : 1; yading@10: fixed_sparse->y[1] = -fixed_sparse->y[0]; yading@10: fixed_sparse->n = 2; yading@10: } yading@10: break; yading@10: } yading@10: } yading@10: yading@10: static void decode_frame(SiprContext *ctx, SiprParameters *params, yading@10: float *out_data) yading@10: { yading@10: int i, j; yading@10: int subframe_count = modes[ctx->mode].subframe_count; yading@10: int frame_size = subframe_count * SUBFR_SIZE; yading@10: float Az[LP_FILTER_ORDER * MAX_SUBFRAME_COUNT]; yading@10: float *excitation; yading@10: float ir_buf[SUBFR_SIZE + LP_FILTER_ORDER]; yading@10: float lsf_new[LP_FILTER_ORDER]; yading@10: float *impulse_response = ir_buf + LP_FILTER_ORDER; yading@10: float *synth = ctx->synth_buf + 16; // 16 instead of LP_FILTER_ORDER for yading@10: // memory alignment yading@10: int t0_first = 0; yading@10: AMRFixed fixed_cb; yading@10: yading@10: memset(ir_buf, 0, LP_FILTER_ORDER * sizeof(float)); yading@10: lsf_decode_fp(lsf_new, ctx->lsf_history, params); yading@10: yading@10: sipr_decode_lp(lsf_new, ctx->lsp_history, Az, subframe_count); yading@10: yading@10: memcpy(ctx->lsp_history, lsf_new, LP_FILTER_ORDER * sizeof(float)); yading@10: yading@10: excitation = ctx->excitation + PITCH_DELAY_MAX + L_INTERPOL; yading@10: yading@10: for (i = 0; i < subframe_count; i++) { yading@10: float *pAz = Az + i*LP_FILTER_ORDER; yading@10: float fixed_vector[SUBFR_SIZE]; yading@10: int T0,T0_frac; yading@10: float pitch_gain, gain_code, avg_energy; yading@10: yading@10: ff_decode_pitch_lag(&T0, &T0_frac, params->pitch_delay[i], t0_first, i, yading@10: ctx->mode == MODE_5k0, 6); yading@10: yading@10: if (i == 0 || (i == 2 && ctx->mode == MODE_5k0)) yading@10: t0_first = T0; yading@10: yading@10: ff_acelp_interpolatef(excitation, excitation - T0 + (T0_frac <= 0), yading@10: ff_b60_sinc, 6, yading@10: 2 * ((2 + T0_frac)%3 + 1), LP_FILTER_ORDER, yading@10: SUBFR_SIZE); yading@10: yading@10: decode_fixed_sparse(&fixed_cb, params->fc_indexes[i], ctx->mode, yading@10: ctx->past_pitch_gain < 0.8); yading@10: yading@10: eval_ir(pAz, T0, impulse_response, modes[ctx->mode].pitch_sharp_factor); yading@10: yading@10: convolute_with_sparse(fixed_vector, &fixed_cb, impulse_response, yading@10: SUBFR_SIZE); yading@10: yading@10: avg_energy = (0.01 + avpriv_scalarproduct_float_c(fixed_vector, yading@10: fixed_vector, yading@10: SUBFR_SIZE)) / yading@10: SUBFR_SIZE; yading@10: yading@10: ctx->past_pitch_gain = pitch_gain = gain_cb[params->gc_index[i]][0]; yading@10: yading@10: gain_code = ff_amr_set_fixed_gain(gain_cb[params->gc_index[i]][1], yading@10: avg_energy, ctx->energy_history, yading@10: 34 - 15.0/(0.05*M_LN10/M_LN2), yading@10: pred); yading@10: yading@10: ff_weighted_vector_sumf(excitation, excitation, fixed_vector, yading@10: pitch_gain, gain_code, SUBFR_SIZE); yading@10: yading@10: pitch_gain *= 0.5 * pitch_gain; yading@10: pitch_gain = FFMIN(pitch_gain, 0.4); yading@10: yading@10: ctx->gain_mem = 0.7 * ctx->gain_mem + 0.3 * pitch_gain; yading@10: ctx->gain_mem = FFMIN(ctx->gain_mem, pitch_gain); yading@10: gain_code *= ctx->gain_mem; yading@10: yading@10: for (j = 0; j < SUBFR_SIZE; j++) yading@10: fixed_vector[j] = excitation[j] - gain_code * fixed_vector[j]; yading@10: yading@10: if (ctx->mode == MODE_5k0) { yading@10: postfilter_5k0(ctx, pAz, fixed_vector); yading@10: yading@10: ff_celp_lp_synthesis_filterf(ctx->postfilter_syn5k0 + LP_FILTER_ORDER + i*SUBFR_SIZE, yading@10: pAz, excitation, SUBFR_SIZE, yading@10: LP_FILTER_ORDER); yading@10: } yading@10: yading@10: ff_celp_lp_synthesis_filterf(synth + i*SUBFR_SIZE, pAz, fixed_vector, yading@10: SUBFR_SIZE, LP_FILTER_ORDER); yading@10: yading@10: excitation += SUBFR_SIZE; yading@10: } yading@10: yading@10: memcpy(synth - LP_FILTER_ORDER, synth + frame_size - LP_FILTER_ORDER, yading@10: LP_FILTER_ORDER * sizeof(float)); yading@10: yading@10: if (ctx->mode == MODE_5k0) { yading@10: for (i = 0; i < subframe_count; i++) { yading@10: float energy = avpriv_scalarproduct_float_c(ctx->postfilter_syn5k0 + LP_FILTER_ORDER + i * SUBFR_SIZE, yading@10: ctx->postfilter_syn5k0 + LP_FILTER_ORDER + i * SUBFR_SIZE, yading@10: SUBFR_SIZE); yading@10: ff_adaptive_gain_control(&synth[i * SUBFR_SIZE], yading@10: &synth[i * SUBFR_SIZE], energy, yading@10: SUBFR_SIZE, 0.9, &ctx->postfilter_agc); yading@10: } yading@10: yading@10: memcpy(ctx->postfilter_syn5k0, ctx->postfilter_syn5k0 + frame_size, yading@10: LP_FILTER_ORDER*sizeof(float)); yading@10: } yading@10: memmove(ctx->excitation, excitation - PITCH_DELAY_MAX - L_INTERPOL, yading@10: (PITCH_DELAY_MAX + L_INTERPOL) * sizeof(float)); yading@10: yading@10: ff_acelp_apply_order_2_transfer_function(out_data, synth, yading@10: (const float[2]) {-1.99997 , 1.000000000}, yading@10: (const float[2]) {-1.93307352, 0.935891986}, yading@10: 0.939805806, yading@10: ctx->highpass_filt_mem, yading@10: frame_size); yading@10: } yading@10: yading@10: static av_cold int sipr_decoder_init(AVCodecContext * avctx) yading@10: { yading@10: SiprContext *ctx = avctx->priv_data; yading@10: int i; yading@10: yading@10: switch (avctx->block_align) { yading@10: case 20: ctx->mode = MODE_16k; break; yading@10: case 19: ctx->mode = MODE_8k5; break; yading@10: case 29: ctx->mode = MODE_6k5; break; yading@10: case 37: ctx->mode = MODE_5k0; break; yading@10: default: yading@10: if (avctx->bit_rate > 12200) ctx->mode = MODE_16k; yading@10: else if (avctx->bit_rate > 7500 ) ctx->mode = MODE_8k5; yading@10: else if (avctx->bit_rate > 5750 ) ctx->mode = MODE_6k5; yading@10: else ctx->mode = MODE_5k0; yading@10: av_log(avctx, AV_LOG_WARNING, yading@10: "Invalid block_align: %d. Mode %s guessed based on bitrate: %d\n", yading@10: avctx->block_align, modes[ctx->mode].mode_name, avctx->bit_rate); yading@10: } yading@10: yading@10: av_log(avctx, AV_LOG_DEBUG, "Mode: %s\n", modes[ctx->mode].mode_name); yading@10: yading@10: if (ctx->mode == MODE_16k) { yading@10: ff_sipr_init_16k(ctx); yading@10: ctx->decode_frame = ff_sipr_decode_frame_16k; yading@10: } else { yading@10: ctx->decode_frame = decode_frame; yading@10: } yading@10: yading@10: for (i = 0; i < LP_FILTER_ORDER; i++) yading@10: ctx->lsp_history[i] = cos((i+1) * M_PI / (LP_FILTER_ORDER + 1)); yading@10: yading@10: for (i = 0; i < 4; i++) yading@10: ctx->energy_history[i] = -14; yading@10: yading@10: avctx->channels = 1; yading@10: avctx->channel_layout = AV_CH_LAYOUT_MONO; yading@10: avctx->sample_fmt = AV_SAMPLE_FMT_FLT; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int sipr_decode_frame(AVCodecContext *avctx, void *data, yading@10: int *got_frame_ptr, AVPacket *avpkt) yading@10: { yading@10: SiprContext *ctx = avctx->priv_data; yading@10: AVFrame *frame = data; yading@10: const uint8_t *buf=avpkt->data; yading@10: SiprParameters parm; yading@10: const SiprModeParam *mode_par = &modes[ctx->mode]; yading@10: GetBitContext gb; yading@10: float *samples; yading@10: int subframe_size = ctx->mode == MODE_16k ? L_SUBFR_16k : SUBFR_SIZE; yading@10: int i, ret; yading@10: yading@10: ctx->avctx = avctx; yading@10: if (avpkt->size < (mode_par->bits_per_frame >> 3)) { yading@10: av_log(avctx, AV_LOG_ERROR, yading@10: "Error processing packet: packet size (%d) too small\n", yading@10: avpkt->size); yading@10: return -1; yading@10: } yading@10: yading@10: /* get output buffer */ yading@10: frame->nb_samples = mode_par->frames_per_packet * subframe_size * yading@10: mode_par->subframe_count; yading@10: if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) yading@10: return ret; yading@10: samples = (float *)frame->data[0]; yading@10: yading@10: init_get_bits(&gb, buf, mode_par->bits_per_frame); yading@10: yading@10: for (i = 0; i < mode_par->frames_per_packet; i++) { yading@10: decode_parameters(&parm, &gb, mode_par); yading@10: yading@10: ctx->decode_frame(ctx, &parm, samples); yading@10: yading@10: samples += subframe_size * mode_par->subframe_count; yading@10: } yading@10: yading@10: *got_frame_ptr = 1; yading@10: yading@10: return mode_par->bits_per_frame >> 3; yading@10: } yading@10: yading@10: AVCodec ff_sipr_decoder = { yading@10: .name = "sipr", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_SIPR, yading@10: .priv_data_size = sizeof(SiprContext), yading@10: .init = sipr_decoder_init, yading@10: .decode = sipr_decode_frame, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("RealAudio SIPR / ACELP.NET"), yading@10: };