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avcodec/amr*dec: reindent

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This commit is contained in:
Paul B Mahol 2021-10-03 11:37:50 +02:00
parent f282c34c00
commit d2cf2cb0bd
2 changed files with 263 additions and 263 deletions
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210
libavcodec/amrnbdec.c
View File

@ -181,21 +181,21 @@ static av_cold int amrnb_decode_init(AVCodecContext *avctx)
for (int ch = 0; ch < avctx->channels; ch++) { for (int ch = 0; ch < avctx->channels; ch++) {
AMRContext *p = &s->ch[ch]; AMRContext *p = &s->ch[ch];
// p->excitation always points to the same position in p->excitation_buf // p->excitation always points to the same position in p->excitation_buf
p->excitation = &p->excitation_buf[PITCH_DELAY_MAX + LP_FILTER_ORDER + 1]; p->excitation = &p->excitation_buf[PITCH_DELAY_MAX + LP_FILTER_ORDER + 1];
for (i = 0; i < LP_FILTER_ORDER; i++) { for (i = 0; i < LP_FILTER_ORDER; i++) {
p->prev_lsp_sub4[i] = lsp_sub4_init[i] * 1000 / (float)(1 << 15); p->prev_lsp_sub4[i] = lsp_sub4_init[i] * 1000 / (float)(1 << 15);
p->lsf_avg[i] = p->lsf_q[3][i] = lsp_avg_init[i] / (float)(1 << 15); p->lsf_avg[i] = p->lsf_q[3][i] = lsp_avg_init[i] / (float)(1 << 15);
} }
for (i = 0; i < 4; i++) for (i = 0; i < 4; i++)
p->prediction_error[i] = MIN_ENERGY; p->prediction_error[i] = MIN_ENERGY;
ff_acelp_filter_init(&p->acelpf_ctx); ff_acelp_filter_init(&p->acelpf_ctx);
ff_acelp_vectors_init(&p->acelpv_ctx); ff_acelp_vectors_init(&p->acelpv_ctx);
ff_celp_filter_init(&p->celpf_ctx); ff_celp_filter_init(&p->celpf_ctx);
ff_celp_math_init(&p->celpm_ctx); ff_celp_math_init(&p->celpm_ctx);
} }
return 0; return 0;
@ -980,112 +980,112 @@ static int amrnb_decode_frame(AVCodecContext *avctx, void *data,
int channel_size; int channel_size;
int i, subframe; int i, subframe;
p->cur_frame_mode = unpack_bitstream(p, buf, buf_size); p->cur_frame_mode = unpack_bitstream(p, buf, buf_size);
channel_size = frame_sizes_nb[p->cur_frame_mode] + 1; // +7 for rounding and +8 for TOC channel_size = frame_sizes_nb[p->cur_frame_mode] + 1; // +7 for rounding and +8 for TOC
if (p->cur_frame_mode == NO_DATA) { if (p->cur_frame_mode == NO_DATA) {
av_log(avctx, AV_LOG_ERROR, "Corrupt bitstream\n"); av_log(avctx, AV_LOG_ERROR, "Corrupt bitstream\n");
return AVERROR_INVALIDDATA;
}
if (p->cur_frame_mode == MODE_DTX) {
avpriv_report_missing_feature(avctx, "dtx mode");
av_log(avctx, AV_LOG_INFO, "Note: libopencore_amrnb supports dtx\n");
return AVERROR_PATCHWELCOME;
}
if (p->cur_frame_mode == MODE_12k2) {
lsf2lsp_5(p);
} else
lsf2lsp_3(p);
for (i = 0; i < 4; i++)
ff_acelp_lspd2lpc(p->lsp[i], p->lpc[i], 5);
for (subframe = 0; subframe < 4; subframe++) {
const AMRNBSubframe *amr_subframe = &p->frame.subframe[subframe];
decode_pitch_vector(p, amr_subframe, subframe);
decode_fixed_sparse(&fixed_sparse, amr_subframe->pulses,
p->cur_frame_mode, subframe);
// The fixed gain (section 6.1.3) depends on the fixed vector
// (section 6.1.2), but the fixed vector calculation uses
// pitch sharpening based on the on the pitch gain (section 6.1.3).
// So the correct order is: pitch gain, pitch sharpening, fixed gain.
decode_gains(p, amr_subframe, p->cur_frame_mode, subframe,
&fixed_gain_factor);
pitch_sharpening(p, subframe, p->cur_frame_mode, &fixed_sparse);
if (fixed_sparse.pitch_lag == 0) {
av_log(avctx, AV_LOG_ERROR, "The file is corrupted, pitch_lag = 0 is not allowed\n");
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
} }
ff_set_fixed_vector(p->fixed_vector, &fixed_sparse, 1.0, if (p->cur_frame_mode == MODE_DTX) {
AMR_SUBFRAME_SIZE); avpriv_report_missing_feature(avctx, "dtx mode");
av_log(avctx, AV_LOG_INFO, "Note: libopencore_amrnb supports dtx\n");
return AVERROR_PATCHWELCOME;
}
p->fixed_gain[4] = if (p->cur_frame_mode == MODE_12k2) {
ff_amr_set_fixed_gain(fixed_gain_factor, lsf2lsp_5(p);
p->celpm_ctx.dot_productf(p->fixed_vector, } else
p->fixed_vector, lsf2lsp_3(p);
AMR_SUBFRAME_SIZE) /
AMR_SUBFRAME_SIZE,
p->prediction_error,
energy_mean[p->cur_frame_mode], energy_pred_fac);
// The excitation feedback is calculated without any processing such for (i = 0; i < 4; i++)
// as fixed gain smoothing. This isn't mentioned in the specification. ff_acelp_lspd2lpc(p->lsp[i], p->lpc[i], 5);
for (i = 0; i < AMR_SUBFRAME_SIZE; i++)
p->excitation[i] *= p->pitch_gain[4];
ff_set_fixed_vector(p->excitation, &fixed_sparse, p->fixed_gain[4],
AMR_SUBFRAME_SIZE);
// In the ref decoder, excitation is stored with no fractional bits. for (subframe = 0; subframe < 4; subframe++) {
// This step prevents buzz in silent periods. The ref encoder can const AMRNBSubframe *amr_subframe = &p->frame.subframe[subframe];
// emit long sequences with pitch factor greater than one. This
// creates unwanted feedback if the excitation vector is nonzero.
// (e.g. test sequence T19_795.COD in 3GPP TS 26.074)
for (i = 0; i < AMR_SUBFRAME_SIZE; i++)
p->excitation[i] = truncf(p->excitation[i]);
// Smooth fixed gain. decode_pitch_vector(p, amr_subframe, subframe);
// The specification is ambiguous, but in the reference source, the
// smoothed value is NOT fed back into later fixed gain smoothing.
synth_fixed_gain = fixed_gain_smooth(p, p->lsf_q[subframe],
p->lsf_avg, p->cur_frame_mode);
synth_fixed_vector = anti_sparseness(p, &fixed_sparse, p->fixed_vector, decode_fixed_sparse(&fixed_sparse, amr_subframe->pulses,
synth_fixed_gain, spare_vector); p->cur_frame_mode, subframe);
if (synthesis(p, p->lpc[subframe], synth_fixed_gain, // The fixed gain (section 6.1.3) depends on the fixed vector
synth_fixed_vector, &p->samples_in[LP_FILTER_ORDER], 0)) // (section 6.1.2), but the fixed vector calculation uses
// overflow detected -> rerun synthesis scaling pitch vector down // pitch sharpening based on the on the pitch gain (section 6.1.3).
// by a factor of 4, skipping pitch vector contribution emphasis // So the correct order is: pitch gain, pitch sharpening, fixed gain.
// and adaptive gain control decode_gains(p, amr_subframe, p->cur_frame_mode, subframe,
synthesis(p, p->lpc[subframe], synth_fixed_gain, &fixed_gain_factor);
synth_fixed_vector, &p->samples_in[LP_FILTER_ORDER], 1);
postfilter(p, p->lpc[subframe], buf_out + subframe * AMR_SUBFRAME_SIZE); pitch_sharpening(p, subframe, p->cur_frame_mode, &fixed_sparse);
// update buffers and history if (fixed_sparse.pitch_lag == 0) {
ff_clear_fixed_vector(p->fixed_vector, &fixed_sparse, AMR_SUBFRAME_SIZE); av_log(avctx, AV_LOG_ERROR, "The file is corrupted, pitch_lag = 0 is not allowed\n");
update_state(p); return AVERROR_INVALIDDATA;
} }
ff_set_fixed_vector(p->fixed_vector, &fixed_sparse, 1.0,
AMR_SUBFRAME_SIZE);
p->acelpf_ctx.acelp_apply_order_2_transfer_function(buf_out, p->fixed_gain[4] =
buf_out, highpass_zeros, ff_amr_set_fixed_gain(fixed_gain_factor,
highpass_poles, p->celpm_ctx.dot_productf(p->fixed_vector,
highpass_gain * AMR_SAMPLE_SCALE, p->fixed_vector,
p->high_pass_mem, AMR_BLOCK_SIZE); AMR_SUBFRAME_SIZE) /
AMR_SUBFRAME_SIZE,
p->prediction_error,
energy_mean[p->cur_frame_mode], energy_pred_fac);
/* Update averaged lsf vector (used for fixed gain smoothing). // The excitation feedback is calculated without any processing such
* // as fixed gain smoothing. This isn't mentioned in the specification.
* Note that lsf_avg should not incorporate the current frame's LSFs for (i = 0; i < AMR_SUBFRAME_SIZE; i++)
* for fixed_gain_smooth. p->excitation[i] *= p->pitch_gain[4];
* The specification has an incorrect formula: the reference decoder uses ff_set_fixed_vector(p->excitation, &fixed_sparse, p->fixed_gain[4],
* qbar(n-1) rather than qbar(n) in section 6.1(4) equation 71. */ AMR_SUBFRAME_SIZE);
p->acelpv_ctx.weighted_vector_sumf(p->lsf_avg, p->lsf_avg, p->lsf_q[3],
0.84, 0.16, LP_FILTER_ORDER); // In the ref decoder, excitation is stored with no fractional bits.
// This step prevents buzz in silent periods. The ref encoder can
// emit long sequences with pitch factor greater than one. This
// creates unwanted feedback if the excitation vector is nonzero.
// (e.g. test sequence T19_795.COD in 3GPP TS 26.074)
for (i = 0; i < AMR_SUBFRAME_SIZE; i++)
p->excitation[i] = truncf(p->excitation[i]);
// Smooth fixed gain.
// The specification is ambiguous, but in the reference source, the
// smoothed value is NOT fed back into later fixed gain smoothing.
synth_fixed_gain = fixed_gain_smooth(p, p->lsf_q[subframe],
p->lsf_avg, p->cur_frame_mode);
synth_fixed_vector = anti_sparseness(p, &fixed_sparse, p->fixed_vector,
synth_fixed_gain, spare_vector);
if (synthesis(p, p->lpc[subframe], synth_fixed_gain,
synth_fixed_vector, &p->samples_in[LP_FILTER_ORDER], 0))
// overflow detected -> rerun synthesis scaling pitch vector down
// by a factor of 4, skipping pitch vector contribution emphasis
// and adaptive gain control
synthesis(p, p->lpc[subframe], synth_fixed_gain,
synth_fixed_vector, &p->samples_in[LP_FILTER_ORDER], 1);
postfilter(p, p->lpc[subframe], buf_out + subframe * AMR_SUBFRAME_SIZE);
// update buffers and history
ff_clear_fixed_vector(p->fixed_vector, &fixed_sparse, AMR_SUBFRAME_SIZE);
update_state(p);
}
p->acelpf_ctx.acelp_apply_order_2_transfer_function(buf_out,
buf_out, highpass_zeros,
highpass_poles,
highpass_gain * AMR_SAMPLE_SCALE,
p->high_pass_mem, AMR_BLOCK_SIZE);
/* Update averaged lsf vector (used for fixed gain smoothing).
*
* Note that lsf_avg should not incorporate the current frame's LSFs
* for fixed_gain_smooth.
* The specification has an incorrect formula: the reference decoder uses
* qbar(n-1) rather than qbar(n) in section 6.1(4) equation 71. */
p->acelpv_ctx.weighted_vector_sumf(p->lsf_avg, p->lsf_avg, p->lsf_q[3],
0.84, 0.16, LP_FILTER_ORDER);
buf += channel_size; buf += channel_size;
buf_size -= channel_size; buf_size -= channel_size;
} }

316
libavcodec/amrwbdec.c
View File

@ -116,23 +116,23 @@ static av_cold int amrwb_decode_init(AVCodecContext *avctx)
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
for (int ch = 0; ch < avctx->channels; ch++) { for (int ch = 0; ch < avctx->channels; ch++) {
AMRWBContext *ctx = &s->ch[ch]; AMRWBContext *ctx = &s->ch[ch];
av_lfg_init(&ctx->prng, 1); av_lfg_init(&ctx->prng, 1);
ctx->excitation = &ctx->excitation_buf[AMRWB_P_DELAY_MAX + LP_ORDER + 1]; ctx->excitation = &ctx->excitation_buf[AMRWB_P_DELAY_MAX + LP_ORDER + 1];
ctx->first_frame = 1; ctx->first_frame = 1;
for (i = 0; i < LP_ORDER; i++) for (i = 0; i < LP_ORDER; i++)
ctx->isf_past_final[i] = isf_init[i] * (1.0f / (1 << 15)); ctx->isf_past_final[i] = isf_init[i] * (1.0f / (1 << 15));
for (i = 0; i < 4; i++) for (i = 0; i < 4; i++)
ctx->prediction_error[i] = MIN_ENERGY; ctx->prediction_error[i] = MIN_ENERGY;
ff_acelp_filter_init(&ctx->acelpf_ctx); ff_acelp_filter_init(&ctx->acelpf_ctx);
ff_acelp_vectors_init(&ctx->acelpv_ctx); ff_acelp_vectors_init(&ctx->acelpv_ctx);
ff_celp_filter_init(&ctx->celpf_ctx); ff_celp_filter_init(&ctx->celpf_ctx);
ff_celp_math_init(&ctx->celpm_ctx); ff_celp_math_init(&ctx->celpm_ctx);
} }
return 0; return 0;
@ -1116,172 +1116,172 @@ static int amrwb_decode_frame(AVCodecContext *avctx, void *data,
return ret; return ret;
for (int ch = 0; ch < avctx->channels; ch++) { for (int ch = 0; ch < avctx->channels; ch++) {
AMRWBContext *ctx = &s->ch[ch]; AMRWBContext *ctx = &s->ch[ch];
AMRWBFrame *cf = &ctx->frame; AMRWBFrame *cf = &ctx->frame;
int expected_fr_size, header_size; int expected_fr_size, header_size;
float spare_vector[AMRWB_SFR_SIZE]; // extra stack space to hold result from anti-sparseness processing float spare_vector[AMRWB_SFR_SIZE]; // extra stack space to hold result from anti-sparseness processing
float fixed_gain_factor; // fixed gain correction factor (gamma) float fixed_gain_factor; // fixed gain correction factor (gamma)
float *synth_fixed_vector; // pointer to the fixed vector that synthesis should use float *synth_fixed_vector; // pointer to the fixed vector that synthesis should use
float synth_fixed_gain; // the fixed gain that synthesis should use float synth_fixed_gain; // the fixed gain that synthesis should use
float voice_fac, stab_fac; // parameters used for gain smoothing float voice_fac, stab_fac; // parameters used for gain smoothing
float synth_exc[AMRWB_SFR_SIZE]; // post-processed excitation for synthesis float synth_exc[AMRWB_SFR_SIZE]; // post-processed excitation for synthesis
float hb_exc[AMRWB_SFR_SIZE_16k]; // excitation for the high frequency band float hb_exc[AMRWB_SFR_SIZE_16k]; // excitation for the high frequency band
float hb_samples[AMRWB_SFR_SIZE_16k]; // filtered high-band samples from synthesis float hb_samples[AMRWB_SFR_SIZE_16k]; // filtered high-band samples from synthesis
float hb_gain; float hb_gain;
float *buf_out = (float *)frame->extended_data[ch]; float *buf_out = (float *)frame->extended_data[ch];
header_size = decode_mime_header(ctx, buf); header_size = decode_mime_header(ctx, buf);
expected_fr_size = ((cf_sizes_wb[ctx->fr_cur_mode] + 7) >> 3) + 1; expected_fr_size = ((cf_sizes_wb[ctx->fr_cur_mode] + 7) >> 3) + 1;
if (!ctx->fr_quality) if (!ctx->fr_quality)
av_log(avctx, AV_LOG_ERROR, "Encountered a bad or corrupted frame\n"); av_log(avctx, AV_LOG_ERROR, "Encountered a bad or corrupted frame\n");
if (ctx->fr_cur_mode == NO_DATA || !ctx->fr_quality) { if (ctx->fr_cur_mode == NO_DATA || !ctx->fr_quality) {
/* The specification suggests a "random signal" and /* The specification suggests a "random signal" and
"a muting technique" to "gradually decrease the output level". */ "a muting technique" to "gradually decrease the output level". */
av_samples_set_silence(&frame->extended_data[ch], 0, frame->nb_samples, 1, AV_SAMPLE_FMT_FLT); av_samples_set_silence(&frame->extended_data[ch], 0, frame->nb_samples, 1, AV_SAMPLE_FMT_FLT);
buf += expected_fr_size; buf += expected_fr_size;
buf_size -= expected_fr_size; buf_size -= expected_fr_size;
continue; continue;
} }
if (ctx->fr_cur_mode > MODE_SID) { if (ctx->fr_cur_mode > MODE_SID) {
av_log(avctx, AV_LOG_ERROR, av_log(avctx, AV_LOG_ERROR,
"Invalid mode %d\n", ctx->fr_cur_mode); "Invalid mode %d\n", ctx->fr_cur_mode);
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
}
if (buf_size < expected_fr_size) {
av_log(avctx, AV_LOG_ERROR,
"Frame too small (%d bytes). Truncated file?\n", buf_size);
*got_frame_ptr = 0;
return AVERROR_INVALIDDATA;
}
if (ctx->fr_cur_mode == MODE_SID) { /* Comfort noise frame */
avpriv_request_sample(avctx, "SID mode");
return AVERROR_PATCHWELCOME;
}
ff_amr_bit_reorder((uint16_t *) &ctx->frame, sizeof(AMRWBFrame),
buf + header_size, amr_bit_orderings_by_mode[ctx->fr_cur_mode]);
/* Decode the quantized ISF vector */
if (ctx->fr_cur_mode == MODE_6k60) {
decode_isf_indices_36b(cf->isp_id, ctx->isf_cur);
} else {
decode_isf_indices_46b(cf->isp_id, ctx->isf_cur);
}
isf_add_mean_and_past(ctx->isf_cur, ctx->isf_q_past);
ff_set_min_dist_lsf(ctx->isf_cur, MIN_ISF_SPACING, LP_ORDER - 1);
stab_fac = stability_factor(ctx->isf_cur, ctx->isf_past_final);
ctx->isf_cur[LP_ORDER - 1] *= 2.0;
ff_acelp_lsf2lspd(ctx->isp[3], ctx->isf_cur, LP_ORDER);
/* Generate a ISP vector for each subframe */
if (ctx->first_frame) {
ctx->first_frame = 0;
memcpy(ctx->isp_sub4_past, ctx->isp[3], LP_ORDER * sizeof(double));
}
interpolate_isp(ctx->isp, ctx->isp_sub4_past);
for (sub = 0; sub < 4; sub++)
ff_amrwb_lsp2lpc(ctx->isp[sub], ctx->lp_coef[sub], LP_ORDER);
for (sub = 0; sub < 4; sub++) {
const AMRWBSubFrame *cur_subframe = &cf->subframe[sub];
float *sub_buf = buf_out + sub * AMRWB_SFR_SIZE_16k;
/* Decode adaptive codebook (pitch vector) */
decode_pitch_vector(ctx, cur_subframe, sub);
/* Decode innovative codebook (fixed vector) */
decode_fixed_vector(ctx->fixed_vector, cur_subframe->pul_ih,
cur_subframe->pul_il, ctx->fr_cur_mode);
pitch_sharpening(ctx, ctx->fixed_vector);
decode_gains(cur_subframe->vq_gain, ctx->fr_cur_mode,
&fixed_gain_factor, &ctx->pitch_gain[0]);
ctx->fixed_gain[0] =
ff_amr_set_fixed_gain(fixed_gain_factor,
ctx->celpm_ctx.dot_productf(ctx->fixed_vector,
ctx->fixed_vector,
AMRWB_SFR_SIZE) /
AMRWB_SFR_SIZE,
ctx->prediction_error,
ENERGY_MEAN, energy_pred_fac);
/* Calculate voice factor and store tilt for next subframe */
voice_fac = voice_factor(ctx->pitch_vector, ctx->pitch_gain[0],
ctx->fixed_vector, ctx->fixed_gain[0],
&ctx->celpm_ctx);
ctx->tilt_coef = voice_fac * 0.25 + 0.25;
/* Construct current excitation */
for (i = 0; i < AMRWB_SFR_SIZE; i++) {
ctx->excitation[i] *= ctx->pitch_gain[0];
ctx->excitation[i] += ctx->fixed_gain[0] * ctx->fixed_vector[i];
ctx->excitation[i] = truncf(ctx->excitation[i]);
} }
/* Post-processing of excitation elements */ if (buf_size < expected_fr_size) {
synth_fixed_gain = noise_enhancer(ctx->fixed_gain[0], &ctx->prev_tr_gain, av_log(avctx, AV_LOG_ERROR,
voice_fac, stab_fac); "Frame too small (%d bytes). Truncated file?\n", buf_size);
*got_frame_ptr = 0;
return AVERROR_INVALIDDATA;
}
synth_fixed_vector = anti_sparseness(ctx, ctx->fixed_vector, if (ctx->fr_cur_mode == MODE_SID) { /* Comfort noise frame */
spare_vector); avpriv_request_sample(avctx, "SID mode");
return AVERROR_PATCHWELCOME;
}
pitch_enhancer(synth_fixed_vector, voice_fac); ff_amr_bit_reorder((uint16_t *) &ctx->frame, sizeof(AMRWBFrame),
buf + header_size, amr_bit_orderings_by_mode[ctx->fr_cur_mode]);
synthesis(ctx, ctx->lp_coef[sub], synth_exc, synth_fixed_gain, /* Decode the quantized ISF vector */
synth_fixed_vector, &ctx->samples_az[LP_ORDER]); if (ctx->fr_cur_mode == MODE_6k60) {
decode_isf_indices_36b(cf->isp_id, ctx->isf_cur);
} else {
decode_isf_indices_46b(cf->isp_id, ctx->isf_cur);
}
/* Synthesis speech post-processing */ isf_add_mean_and_past(ctx->isf_cur, ctx->isf_q_past);
de_emphasis(&ctx->samples_up[UPS_MEM_SIZE], ff_set_min_dist_lsf(ctx->isf_cur, MIN_ISF_SPACING, LP_ORDER - 1);
&ctx->samples_az[LP_ORDER], PREEMPH_FAC, ctx->demph_mem);
ctx->acelpf_ctx.acelp_apply_order_2_transfer_function(&ctx->samples_up[UPS_MEM_SIZE], stab_fac = stability_factor(ctx->isf_cur, ctx->isf_past_final);
&ctx->samples_up[UPS_MEM_SIZE], hpf_zeros, hpf_31_poles,
hpf_31_gain, ctx->hpf_31_mem, AMRWB_SFR_SIZE);
upsample_5_4(sub_buf, &ctx->samples_up[UPS_FIR_SIZE], ctx->isf_cur[LP_ORDER - 1] *= 2.0;
AMRWB_SFR_SIZE_16k, &ctx->celpm_ctx); ff_acelp_lsf2lspd(ctx->isp[3], ctx->isf_cur, LP_ORDER);
/* High frequency band (6.4 - 7.0 kHz) generation part */ /* Generate a ISP vector for each subframe */
ctx->acelpf_ctx.acelp_apply_order_2_transfer_function(hb_samples, if (ctx->first_frame) {
&ctx->samples_up[UPS_MEM_SIZE], hpf_zeros, hpf_400_poles, ctx->first_frame = 0;
hpf_400_gain, ctx->hpf_400_mem, AMRWB_SFR_SIZE); memcpy(ctx->isp_sub4_past, ctx->isp[3], LP_ORDER * sizeof(double));
}
interpolate_isp(ctx->isp, ctx->isp_sub4_past);
hb_gain = find_hb_gain(ctx, hb_samples, for (sub = 0; sub < 4; sub++)
cur_subframe->hb_gain, cf->vad); ff_amrwb_lsp2lpc(ctx->isp[sub], ctx->lp_coef[sub], LP_ORDER);
scaled_hb_excitation(ctx, hb_exc, synth_exc, hb_gain); for (sub = 0; sub < 4; sub++) {
const AMRWBSubFrame *cur_subframe = &cf->subframe[sub];
float *sub_buf = buf_out + sub * AMRWB_SFR_SIZE_16k;
hb_synthesis(ctx, sub, &ctx->samples_hb[LP_ORDER_16k], /* Decode adaptive codebook (pitch vector) */
hb_exc, ctx->isf_cur, ctx->isf_past_final); decode_pitch_vector(ctx, cur_subframe, sub);
/* Decode innovative codebook (fixed vector) */
decode_fixed_vector(ctx->fixed_vector, cur_subframe->pul_ih,
cur_subframe->pul_il, ctx->fr_cur_mode);
/* High-band post-processing filters */ pitch_sharpening(ctx, ctx->fixed_vector);
hb_fir_filter(hb_samples, bpf_6_7_coef, ctx->bpf_6_7_mem,
&ctx->samples_hb[LP_ORDER_16k]);
if (ctx->fr_cur_mode == MODE_23k85) decode_gains(cur_subframe->vq_gain, ctx->fr_cur_mode,
hb_fir_filter(hb_samples, lpf_7_coef, ctx->lpf_7_mem, &fixed_gain_factor, &ctx->pitch_gain[0]);
hb_samples);
/* Add the low and high frequency bands */ ctx->fixed_gain[0] =
for (i = 0; i < AMRWB_SFR_SIZE_16k; i++) ff_amr_set_fixed_gain(fixed_gain_factor,
sub_buf[i] = (sub_buf[i] + hb_samples[i]) * (1.0f / (1 << 15)); ctx->celpm_ctx.dot_productf(ctx->fixed_vector,
ctx->fixed_vector,
AMRWB_SFR_SIZE) /
AMRWB_SFR_SIZE,
ctx->prediction_error,
ENERGY_MEAN, energy_pred_fac);
/* Update buffers and history */ /* Calculate voice factor and store tilt for next subframe */
update_sub_state(ctx); voice_fac = voice_factor(ctx->pitch_vector, ctx->pitch_gain[0],
} ctx->fixed_vector, ctx->fixed_gain[0],
&ctx->celpm_ctx);
ctx->tilt_coef = voice_fac * 0.25 + 0.25;
/* update state for next frame */ /* Construct current excitation */
memcpy(ctx->isp_sub4_past, ctx->isp[3], LP_ORDER * sizeof(ctx->isp[3][0])); for (i = 0; i < AMRWB_SFR_SIZE; i++) {
memcpy(ctx->isf_past_final, ctx->isf_cur, LP_ORDER * sizeof(float)); ctx->excitation[i] *= ctx->pitch_gain[0];
ctx->excitation[i] += ctx->fixed_gain[0] * ctx->fixed_vector[i];
ctx->excitation[i] = truncf(ctx->excitation[i]);
}
/* Post-processing of excitation elements */
synth_fixed_gain = noise_enhancer(ctx->fixed_gain[0], &ctx->prev_tr_gain,
voice_fac, stab_fac);
synth_fixed_vector = anti_sparseness(ctx, ctx->fixed_vector,
spare_vector);
pitch_enhancer(synth_fixed_vector, voice_fac);
synthesis(ctx, ctx->lp_coef[sub], synth_exc, synth_fixed_gain,
synth_fixed_vector, &ctx->samples_az[LP_ORDER]);
/* Synthesis speech post-processing */
de_emphasis(&ctx->samples_up[UPS_MEM_SIZE],
&ctx->samples_az[LP_ORDER], PREEMPH_FAC, ctx->demph_mem);
ctx->acelpf_ctx.acelp_apply_order_2_transfer_function(&ctx->samples_up[UPS_MEM_SIZE],
&ctx->samples_up[UPS_MEM_SIZE], hpf_zeros, hpf_31_poles,
hpf_31_gain, ctx->hpf_31_mem, AMRWB_SFR_SIZE);
upsample_5_4(sub_buf, &ctx->samples_up[UPS_FIR_SIZE],
AMRWB_SFR_SIZE_16k, &ctx->celpm_ctx);
/* High frequency band (6.4 - 7.0 kHz) generation part */
ctx->acelpf_ctx.acelp_apply_order_2_transfer_function(hb_samples,
&ctx->samples_up[UPS_MEM_SIZE], hpf_zeros, hpf_400_poles,
hpf_400_gain, ctx->hpf_400_mem, AMRWB_SFR_SIZE);
hb_gain = find_hb_gain(ctx, hb_samples,
cur_subframe->hb_gain, cf->vad);
scaled_hb_excitation(ctx, hb_exc, synth_exc, hb_gain);
hb_synthesis(ctx, sub, &ctx->samples_hb[LP_ORDER_16k],
hb_exc, ctx->isf_cur, ctx->isf_past_final);
/* High-band post-processing filters */
hb_fir_filter(hb_samples, bpf_6_7_coef, ctx->bpf_6_7_mem,
&ctx->samples_hb[LP_ORDER_16k]);
if (ctx->fr_cur_mode == MODE_23k85)
hb_fir_filter(hb_samples, lpf_7_coef, ctx->lpf_7_mem,
hb_samples);
/* Add the low and high frequency bands */
for (i = 0; i < AMRWB_SFR_SIZE_16k; i++)
sub_buf[i] = (sub_buf[i] + hb_samples[i]) * (1.0f / (1 << 15));
/* Update buffers and history */
update_sub_state(ctx);
}
/* update state for next frame */
memcpy(ctx->isp_sub4_past, ctx->isp[3], LP_ORDER * sizeof(ctx->isp[3][0]));
memcpy(ctx->isf_past_final, ctx->isf_cur, LP_ORDER * sizeof(float));
buf += expected_fr_size; buf += expected_fr_size;
buf_size -= expected_fr_size; buf_size -= expected_fr_size;