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aacenc: cosmetics, indentation, and comment clarification
Correct bad indentation in aaccoder Clarify and correct comments in 3GPP psymodel, other cosmetics.
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@ -146,34 +146,34 @@ static av_always_inline float quantize_and_encode_band_cost_template(
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curidx *= range;
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curidx += quants[j] + off;
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}
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curbits = ff_aac_spectral_bits[cb-1][curidx];
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vec = &ff_aac_codebook_vectors[cb-1][curidx*dim];
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if (BT_UNSIGNED) {
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for (k = 0; k < dim; k++) {
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float t = fabsf(in[i+k]);
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float di;
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if (BT_ESC && vec[k] == 64.0f) { //FIXME: slow
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if (t >= CLIPPED_ESCAPE) {
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di = t - CLIPPED_ESCAPE;
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curbits += 21;
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} else {
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int c = av_clip(quant(t, Q), 0, 8191);
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di = t - c*cbrtf(c)*IQ;
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curbits += av_log2(c)*2 - 4 + 1;
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}
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curbits = ff_aac_spectral_bits[cb-1][curidx];
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vec = &ff_aac_codebook_vectors[cb-1][curidx*dim];
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if (BT_UNSIGNED) {
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for (k = 0; k < dim; k++) {
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float t = fabsf(in[i+k]);
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float di;
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if (BT_ESC && vec[k] == 64.0f) { //FIXME: slow
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if (t >= CLIPPED_ESCAPE) {
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di = t - CLIPPED_ESCAPE;
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curbits += 21;
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} else {
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di = t - vec[k]*IQ;
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int c = av_clip(quant(t, Q), 0, 8191);
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di = t - c*cbrtf(c)*IQ;
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curbits += av_log2(c)*2 - 4 + 1;
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}
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if (vec[k] != 0.0f)
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curbits++;
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rd += di*di;
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}
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} else {
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for (k = 0; k < dim; k++) {
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float di = in[i+k] - vec[k]*IQ;
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rd += di*di;
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} else {
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di = t - vec[k]*IQ;
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}
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if (vec[k] != 0.0f)
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curbits++;
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rd += di*di;
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}
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} else {
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for (k = 0; k < dim; k++) {
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float di = in[i+k] - vec[k]*IQ;
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rd += di*di;
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}
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}
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cost += rd * lambda + curbits;
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resbits += curbits;
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if (cost >= uplim)
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@ -575,7 +575,7 @@ static void search_for_quantizers_anmr(AVCodecContext *avctx, AACEncContext *s,
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int qnrg = av_clip_uint8(log2f(sqrtf(qnrgf/qcnt))*4 - 31 + SCALE_ONE_POS - SCALE_DIV_512);
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q1 = qnrg + 30;
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q0 = qnrg - 30;
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//av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
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//av_log(NULL, AV_LOG_ERROR, "q0 %d, q1 %d\n", q0, q1);
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if (q0 < q0low) {
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q1 += q0low - q0;
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q0 = q0low;
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@ -39,8 +39,8 @@
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* constants for 3GPP AAC psychoacoustic model
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* @{
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*/
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#define PSY_3GPP_SPREAD_HI 1.5f // spreading factor for ascending threshold spreading (15 dB/Bark)
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#define PSY_3GPP_SPREAD_LOW 3.0f // spreading factor for descending threshold spreading (30 dB/Bark)
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#define PSY_3GPP_THR_SPREAD_HI 1.5f // spreading factor for low-to-hi threshold spreading (15 dB/Bark)
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#define PSY_3GPP_THR_SPREAD_LOW 3.0f // spreading factor for hi-to-low threshold spreading (30 dB/Bark)
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#define PSY_3GPP_RPEMIN 0.01f
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#define PSY_3GPP_RPELEV 2.0f
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@ -256,8 +256,8 @@ static av_cold int psy_3gpp_init(FFPsyContext *ctx) {
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for (g = 0; g < ctx->num_bands[j] - 1; g++) {
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AacPsyCoeffs *coeff = &coeffs[g];
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float bark_width = coeffs[g+1].barks - coeffs->barks;
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coeff->spread_low[0] = pow(10.0, -bark_width * PSY_3GPP_SPREAD_LOW);
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coeff->spread_hi [0] = pow(10.0, -bark_width * PSY_3GPP_SPREAD_HI);
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coeff->spread_low[0] = pow(10.0, -bark_width * PSY_3GPP_THR_SPREAD_LOW);
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coeff->spread_hi [0] = pow(10.0, -bark_width * PSY_3GPP_THR_SPREAD_HI);
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}
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start = 0;
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for (g = 0; g < ctx->num_bands[j]; g++) {
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@ -395,9 +395,9 @@ static void psy_3gpp_analyze(FFPsyContext *ctx, int channel,
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AacPsyChannel *pch = &pctx->ch[channel];
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int start = 0;
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int i, w, g;
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const int num_bands = ctx->num_bands[wi->num_windows == 8];
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const uint8_t* band_sizes = ctx->bands[wi->num_windows == 8];
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AacPsyCoeffs *coeffs = &pctx->psy_coef[wi->num_windows == 8];
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const int num_bands = ctx->num_bands[wi->num_windows == 8];
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const uint8_t *band_sizes = ctx->bands[wi->num_windows == 8];
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AacPsyCoeffs *coeffs = &pctx->psy_coef[wi->num_windows == 8];
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//calculate energies, initial thresholds and related values - 5.4.2 "Threshold Calculation"
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for (w = 0; w < wi->num_windows*16; w += 16) {
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@ -410,17 +410,19 @@ static void psy_3gpp_analyze(FFPsyContext *ctx, int channel,
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start += band_sizes[g];
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}
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}
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//modify thresholds - spread, threshold in quiet - 5.4.3 "Spreaded Energy Calculation"
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//modify thresholds and energies - spread, threshold in quiet, pre-echo control
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for (w = 0; w < wi->num_windows*16; w += 16) {
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AacPsyBand *bands = &pch->band[w];
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//5.4.2.3 "Spreading" & 5.4.3 "Spreaded Energy Calculation"
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for (g = 1; g < num_bands; g++)
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bands[g].thr = FFMAX(bands[g].thr, bands[g-1].thr * coeffs[g].spread_hi[0]);
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for (g = num_bands - 2; g >= 0; g--)
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bands[g].thr = FFMAX(bands[g].thr, bands[g+1].thr * coeffs[g].spread_low[0]);
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//5.4.2.4 "Threshold in quiet"
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for (g = 0; g < num_bands; g++) {
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AacPsyBand *band = &bands[g];
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band->thr_quiet = band->thr = FFMAX(band->thr, coeffs[g].ath);
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//5.4.2.5 "Pre-echo control"
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if (!(wi->window_type[0] == LONG_STOP_SEQUENCE || (wi->window_type[1] == LONG_START_SEQUENCE && !w)))
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band->thr = FFMAX(PSY_3GPP_RPEMIN*band->thr, FFMIN(band->thr,
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PSY_3GPP_RPELEV*pch->prev_band[w+g].thr_quiet));
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@ -436,6 +438,7 @@ static void psy_3gpp_analyze(FFPsyContext *ctx, int channel,
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psy_band->energy = band->energy;
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}
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}
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memcpy(pch->prev_band, pch->band, sizeof(pch->band));
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}
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