3 * Copyright (C) 2008 Konstantin Shishkov
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 /***********************************
29 * add sane pulse detection
30 * add temporal noise shaping
31 ***********************************/
33 #include "libavutil/float_dsp.h"
34 #include "libavutil/opt.h"
38 #include "mpeg4audio.h"
45 #include "aacenctab.h"
46 #include "aacenc_utils.h"
51 * Make AAC audio config object.
52 * @see 1.6.2.1 "Syntax - AudioSpecificConfig"
54 static void put_audio_specific_config(AVCodecContext *avctx)
57 AACEncContext *s = avctx->priv_data;
59 init_put_bits(&pb, avctx->extradata, avctx->extradata_size);
60 put_bits(&pb, 5, s->profile+1); //profile
61 put_bits(&pb, 4, s->samplerate_index); //sample rate index
62 put_bits(&pb, 4, s->channels);
64 put_bits(&pb, 1, 0); //frame length - 1024 samples
65 put_bits(&pb, 1, 0); //does not depend on core coder
66 put_bits(&pb, 1, 0); //is not extension
68 //Explicitly Mark SBR absent
69 put_bits(&pb, 11, 0x2b7); //sync extension
70 put_bits(&pb, 5, AOT_SBR);
75 #define WINDOW_FUNC(type) \
76 static void apply_ ##type ##_window(AVFloatDSPContext *fdsp, \
77 SingleChannelElement *sce, \
80 WINDOW_FUNC(only_long)
82 const float *lwindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_long_1024 : ff_sine_1024;
83 const float *pwindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024;
84 float *out = sce->ret_buf;
86 fdsp->vector_fmul (out, audio, lwindow, 1024);
87 fdsp->vector_fmul_reverse(out + 1024, audio + 1024, pwindow, 1024);
90 WINDOW_FUNC(long_start)
92 const float *lwindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024;
93 const float *swindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
94 float *out = sce->ret_buf;
96 fdsp->vector_fmul(out, audio, lwindow, 1024);
97 memcpy(out + 1024, audio + 1024, sizeof(out[0]) * 448);
98 fdsp->vector_fmul_reverse(out + 1024 + 448, audio + 1024 + 448, swindow, 128);
99 memset(out + 1024 + 576, 0, sizeof(out[0]) * 448);
102 WINDOW_FUNC(long_stop)
104 const float *lwindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_long_1024 : ff_sine_1024;
105 const float *swindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128;
106 float *out = sce->ret_buf;
108 memset(out, 0, sizeof(out[0]) * 448);
109 fdsp->vector_fmul(out + 448, audio + 448, swindow, 128);
110 memcpy(out + 576, audio + 576, sizeof(out[0]) * 448);
111 fdsp->vector_fmul_reverse(out + 1024, audio + 1024, lwindow, 1024);
114 WINDOW_FUNC(eight_short)
116 const float *swindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
117 const float *pwindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128;
118 const float *in = audio + 448;
119 float *out = sce->ret_buf;
122 for (w = 0; w < 8; w++) {
123 fdsp->vector_fmul (out, in, w ? pwindow : swindow, 128);
126 fdsp->vector_fmul_reverse(out, in, swindow, 128);
131 static void (*const apply_window[4])(AVFloatDSPContext *fdsp,
132 SingleChannelElement *sce,
133 const float *audio) = {
134 [ONLY_LONG_SEQUENCE] = apply_only_long_window,
135 [LONG_START_SEQUENCE] = apply_long_start_window,
136 [EIGHT_SHORT_SEQUENCE] = apply_eight_short_window,
137 [LONG_STOP_SEQUENCE] = apply_long_stop_window
140 static void apply_window_and_mdct(AACEncContext *s, SingleChannelElement *sce,
144 float *output = sce->ret_buf;
146 apply_window[sce->ics.window_sequence[0]](s->fdsp, sce, audio);
148 if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE)
149 s->mdct1024.mdct_calc(&s->mdct1024, sce->coeffs, output);
151 for (i = 0; i < 1024; i += 128)
152 s->mdct128.mdct_calc(&s->mdct128, &sce->coeffs[i], output + i*2);
153 memcpy(audio, audio + 1024, sizeof(audio[0]) * 1024);
154 memcpy(sce->pcoeffs, sce->coeffs, sizeof(sce->pcoeffs));
158 * Encode ics_info element.
159 * @see Table 4.6 (syntax of ics_info)
161 static void put_ics_info(AACEncContext *s, IndividualChannelStream *info)
165 put_bits(&s->pb, 1, 0); // ics_reserved bit
166 put_bits(&s->pb, 2, info->window_sequence[0]);
167 put_bits(&s->pb, 1, info->use_kb_window[0]);
168 if (info->window_sequence[0] != EIGHT_SHORT_SEQUENCE) {
169 put_bits(&s->pb, 6, info->max_sfb);
170 put_bits(&s->pb, 1, !!info->predictor_present);
172 put_bits(&s->pb, 4, info->max_sfb);
173 for (w = 1; w < 8; w++)
174 put_bits(&s->pb, 1, !info->group_len[w]);
180 * @see 4.6.8.1 "Joint Coding - M/S Stereo"
182 static void encode_ms_info(PutBitContext *pb, ChannelElement *cpe)
186 put_bits(pb, 2, cpe->ms_mode);
187 if (cpe->ms_mode == 1)
188 for (w = 0; w < cpe->ch[0].ics.num_windows; w += cpe->ch[0].ics.group_len[w])
189 for (i = 0; i < cpe->ch[0].ics.max_sfb; i++)
190 put_bits(pb, 1, cpe->ms_mask[w*16 + i]);
194 * Produce integer coefficients from scalefactors provided by the model.
196 static void adjust_frame_information(ChannelElement *cpe, int chans)
200 IndividualChannelStream *ics;
202 if (cpe->common_window) {
203 ics = &cpe->ch[0].ics;
204 for (w = 0; w < ics->num_windows; w += ics->group_len[w]) {
205 for (w2 = 0; w2 < ics->group_len[w]; w2++) {
206 int start = (w+w2) * 128;
207 for (g = 0; g < ics->num_swb; g++) {
208 //apply Intensity stereo coeffs transformation
209 if (cpe->is_mask[w*16 + g]) {
210 int p = -1 + 2 * (cpe->ch[1].band_type[w*16+g] - 14);
211 float scale = cpe->ch[0].is_ener[w*16+g];
212 for (i = 0; i < ics->swb_sizes[g]; i++) {
213 cpe->ch[0].coeffs[start+i] = (cpe->ch[0].coeffs[start+i] + p*cpe->ch[1].coeffs[start+i]) * scale;
214 cpe->ch[1].coeffs[start+i] = 0.0f;
216 } else if (cpe->ms_mask[w*16 + g] &&
217 cpe->ch[0].band_type[w*16 + g] < NOISE_BT &&
218 cpe->ch[1].band_type[w*16 + g] < NOISE_BT) {
219 for (i = 0; i < ics->swb_sizes[g]; i++) {
220 float L = (cpe->ch[0].coeffs[start+i] + cpe->ch[1].coeffs[start+i]) * 0.5f;
221 float R = L - cpe->ch[1].coeffs[start+i];
222 cpe->ch[0].coeffs[start+i] = L;
223 cpe->ch[1].coeffs[start+i] = R;
226 start += ics->swb_sizes[g];
232 for (ch = 0; ch < chans; ch++) {
233 IndividualChannelStream *ics = &cpe->ch[ch].ics;
235 cpe->ch[ch].pulse.num_pulse = 0;
236 for (w = 0; w < ics->num_windows; w += ics->group_len[w]) {
237 for (w2 = 0; w2 < ics->group_len[w]; w2++) {
238 for (cmaxsfb = ics->num_swb; cmaxsfb > 0 && cpe->ch[ch].zeroes[w*16+cmaxsfb-1]; cmaxsfb--)
240 maxsfb = FFMAX(maxsfb, cmaxsfb);
243 ics->max_sfb = maxsfb;
245 //adjust zero bands for window groups
246 for (w = 0; w < ics->num_windows; w += ics->group_len[w]) {
247 for (g = 0; g < ics->max_sfb; g++) {
249 for (w2 = w; w2 < w + ics->group_len[w]; w2++) {
250 if (!cpe->ch[ch].zeroes[w2*16 + g]) {
255 cpe->ch[ch].zeroes[w*16 + g] = i;
260 if (chans > 1 && cpe->common_window) {
261 IndividualChannelStream *ics0 = &cpe->ch[0].ics;
262 IndividualChannelStream *ics1 = &cpe->ch[1].ics;
264 ics0->max_sfb = FFMAX(ics0->max_sfb, ics1->max_sfb);
265 ics1->max_sfb = ics0->max_sfb;
266 for (w = 0; w < ics0->num_windows*16; w += 16)
267 for (i = 0; i < ics0->max_sfb; i++)
268 if (cpe->ms_mask[w+i])
270 if (msc == 0 || ics0->max_sfb == 0)
273 cpe->ms_mode = msc < ics0->max_sfb * ics0->num_windows ? 1 : 2;
278 * Encode scalefactor band coding type.
280 static void encode_band_info(AACEncContext *s, SingleChannelElement *sce)
284 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
285 s->coder->encode_window_bands_info(s, sce, w, sce->ics.group_len[w], s->lambda);
289 * Encode scalefactors.
291 static void encode_scale_factors(AVCodecContext *avctx, AACEncContext *s,
292 SingleChannelElement *sce)
294 int diff, off_sf = sce->sf_idx[0], off_pns = sce->sf_idx[0] - NOISE_OFFSET;
295 int off_is = 0, noise_flag = 1;
298 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
299 for (i = 0; i < sce->ics.max_sfb; i++) {
300 if (!sce->zeroes[w*16 + i]) {
301 if (sce->band_type[w*16 + i] == NOISE_BT) {
302 diff = sce->sf_idx[w*16 + i] - off_pns;
303 off_pns = sce->sf_idx[w*16 + i];
304 if (noise_flag-- > 0) {
305 put_bits(&s->pb, NOISE_PRE_BITS, diff + NOISE_PRE);
308 } else if (sce->band_type[w*16 + i] == INTENSITY_BT ||
309 sce->band_type[w*16 + i] == INTENSITY_BT2) {
310 diff = sce->sf_idx[w*16 + i] - off_is;
311 off_is = sce->sf_idx[w*16 + i];
313 diff = sce->sf_idx[w*16 + i] - off_sf;
314 off_sf = sce->sf_idx[w*16 + i];
316 diff += SCALE_DIFF_ZERO;
317 av_assert0(diff >= 0 && diff <= 120);
318 put_bits(&s->pb, ff_aac_scalefactor_bits[diff], ff_aac_scalefactor_code[diff]);
327 static void encode_pulses(AACEncContext *s, Pulse *pulse)
331 put_bits(&s->pb, 1, !!pulse->num_pulse);
332 if (!pulse->num_pulse)
335 put_bits(&s->pb, 2, pulse->num_pulse - 1);
336 put_bits(&s->pb, 6, pulse->start);
337 for (i = 0; i < pulse->num_pulse; i++) {
338 put_bits(&s->pb, 5, pulse->pos[i]);
339 put_bits(&s->pb, 4, pulse->amp[i]);
344 * Encode spectral coefficients processed by psychoacoustic model.
346 static void encode_spectral_coeffs(AACEncContext *s, SingleChannelElement *sce)
350 for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
352 for (i = 0; i < sce->ics.max_sfb; i++) {
353 if (sce->zeroes[w*16 + i]) {
354 start += sce->ics.swb_sizes[i];
357 for (w2 = w; w2 < w + sce->ics.group_len[w]; w2++)
358 s->coder->quantize_and_encode_band(s, &s->pb,
359 &sce->coeffs[start + w2*128],
360 &sce->pqcoeffs[start + w2*128],
361 sce->ics.swb_sizes[i],
362 sce->sf_idx[w*16 + i],
363 sce->band_type[w*16 + i],
365 sce->ics.window_clipping[w]);
366 start += sce->ics.swb_sizes[i];
372 * Downscale spectral coefficients for near-clipping windows to avoid artifacts
374 static void avoid_clipping(AACEncContext *s, SingleChannelElement *sce)
378 if (sce->ics.clip_avoidance_factor < 1.0f) {
379 for (w = 0; w < sce->ics.num_windows; w++) {
381 for (i = 0; i < sce->ics.max_sfb; i++) {
382 float *swb_coeffs = &sce->coeffs[start + w*128];
383 for (j = 0; j < sce->ics.swb_sizes[i]; j++)
384 swb_coeffs[j] *= sce->ics.clip_avoidance_factor;
385 start += sce->ics.swb_sizes[i];
392 * Encode one channel of audio data.
394 static int encode_individual_channel(AVCodecContext *avctx, AACEncContext *s,
395 SingleChannelElement *sce,
398 put_bits(&s->pb, 8, sce->sf_idx[0]);
399 if (!common_window) {
400 put_ics_info(s, &sce->ics);
401 if (s->coder->encode_main_pred)
402 s->coder->encode_main_pred(s, sce);
404 encode_band_info(s, sce);
405 encode_scale_factors(avctx, s, sce);
406 encode_pulses(s, &sce->pulse);
407 if (s->coder->encode_tns_info)
408 s->coder->encode_tns_info(s, sce);
410 put_bits(&s->pb, 1, 0);
411 put_bits(&s->pb, 1, 0); //ssr
412 encode_spectral_coeffs(s, sce);
417 * Write some auxiliary information about the created AAC file.
419 static void put_bitstream_info(AACEncContext *s, const char *name)
421 int i, namelen, padbits;
423 namelen = strlen(name) + 2;
424 put_bits(&s->pb, 3, TYPE_FIL);
425 put_bits(&s->pb, 4, FFMIN(namelen, 15));
427 put_bits(&s->pb, 8, namelen - 14);
428 put_bits(&s->pb, 4, 0); //extension type - filler
429 padbits = -put_bits_count(&s->pb) & 7;
430 avpriv_align_put_bits(&s->pb);
431 for (i = 0; i < namelen - 2; i++)
432 put_bits(&s->pb, 8, name[i]);
433 put_bits(&s->pb, 12 - padbits, 0);
437 * Copy input samples.
438 * Channels are reordered from libavcodec's default order to AAC order.
440 static void copy_input_samples(AACEncContext *s, const AVFrame *frame)
443 int end = 2048 + (frame ? frame->nb_samples : 0);
444 const uint8_t *channel_map = aac_chan_maps[s->channels - 1];
446 /* copy and remap input samples */
447 for (ch = 0; ch < s->channels; ch++) {
448 /* copy last 1024 samples of previous frame to the start of the current frame */
449 memcpy(&s->planar_samples[ch][1024], &s->planar_samples[ch][2048], 1024 * sizeof(s->planar_samples[0][0]));
451 /* copy new samples and zero any remaining samples */
453 memcpy(&s->planar_samples[ch][2048],
454 frame->extended_data[channel_map[ch]],
455 frame->nb_samples * sizeof(s->planar_samples[0][0]));
457 memset(&s->planar_samples[ch][end], 0,
458 (3072 - end) * sizeof(s->planar_samples[0][0]));
462 static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
463 const AVFrame *frame, int *got_packet_ptr)
465 AACEncContext *s = avctx->priv_data;
466 float **samples = s->planar_samples, *samples2, *la, *overlap;
468 SingleChannelElement *sce;
469 int i, ch, w, g, chans, tag, start_ch, ret;
470 int ms_mode = 0, is_mode = 0, tns_mode = 0, pred_mode = 0;
471 int chan_el_counter[4];
472 FFPsyWindowInfo windows[AAC_MAX_CHANNELS];
474 if (s->last_frame == 2)
477 /* add current frame to queue */
479 if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
483 copy_input_samples(s, frame);
485 ff_psy_preprocess(s->psypp, s->planar_samples, s->channels);
487 if (!avctx->frame_number)
491 for (i = 0; i < s->chan_map[0]; i++) {
492 FFPsyWindowInfo* wi = windows + start_ch;
493 tag = s->chan_map[i+1];
494 chans = tag == TYPE_CPE ? 2 : 1;
496 for (ch = 0; ch < chans; ch++) {
497 IndividualChannelStream *ics = &cpe->ch[ch].ics;
498 int cur_channel = start_ch + ch;
499 float clip_avoidance_factor;
500 overlap = &samples[cur_channel][0];
501 samples2 = overlap + 1024;
502 la = samples2 + (448+64);
505 if (tag == TYPE_LFE) {
506 wi[ch].window_type[0] = ONLY_LONG_SEQUENCE;
507 wi[ch].window_shape = 0;
508 wi[ch].num_windows = 1;
509 wi[ch].grouping[0] = 1;
511 /* Only the lowest 12 coefficients are used in a LFE channel.
512 * The expression below results in only the bottom 8 coefficients
513 * being used for 11.025kHz to 16kHz sample rates.
515 ics->num_swb = s->samplerate_index >= 8 ? 1 : 3;
517 wi[ch] = s->psy.model->window(&s->psy, samples2, la, cur_channel,
518 ics->window_sequence[0]);
520 ics->window_sequence[1] = ics->window_sequence[0];
521 ics->window_sequence[0] = wi[ch].window_type[0];
522 ics->use_kb_window[1] = ics->use_kb_window[0];
523 ics->use_kb_window[0] = wi[ch].window_shape;
524 ics->num_windows = wi[ch].num_windows;
525 ics->swb_sizes = s->psy.bands [ics->num_windows == 8];
526 ics->num_swb = tag == TYPE_LFE ? ics->num_swb : s->psy.num_bands[ics->num_windows == 8];
527 ics->swb_offset = wi[ch].window_type[0] == EIGHT_SHORT_SEQUENCE ?
528 ff_swb_offset_128 [s->samplerate_index]:
529 ff_swb_offset_1024[s->samplerate_index];
530 clip_avoidance_factor = 0.0f;
531 for (w = 0; w < ics->num_windows; w++)
532 ics->group_len[w] = wi[ch].grouping[w];
533 for (w = 0; w < ics->num_windows; w++) {
534 if (wi[ch].clipping[w] > CLIP_AVOIDANCE_FACTOR) {
535 ics->window_clipping[w] = 1;
536 clip_avoidance_factor = FFMAX(clip_avoidance_factor, wi[ch].clipping[w]);
538 ics->window_clipping[w] = 0;
541 if (clip_avoidance_factor > CLIP_AVOIDANCE_FACTOR) {
542 ics->clip_avoidance_factor = CLIP_AVOIDANCE_FACTOR / clip_avoidance_factor;
544 ics->clip_avoidance_factor = 1.0f;
547 apply_window_and_mdct(s, &cpe->ch[ch], overlap);
548 if (isnan(cpe->ch->coeffs[0])) {
549 av_log(avctx, AV_LOG_ERROR, "Input contains NaN\n");
550 return AVERROR(EINVAL);
552 avoid_clipping(s, &cpe->ch[ch]);
556 if ((ret = ff_alloc_packet2(avctx, avpkt, 8192 * s->channels, 0)) < 0)
561 init_put_bits(&s->pb, avpkt->data, avpkt->size);
563 if ((avctx->frame_number & 0xFF)==1 && !(avctx->flags & AV_CODEC_FLAG_BITEXACT))
564 put_bitstream_info(s, LIBAVCODEC_IDENT);
566 memset(chan_el_counter, 0, sizeof(chan_el_counter));
567 for (i = 0; i < s->chan_map[0]; i++) {
568 FFPsyWindowInfo* wi = windows + start_ch;
569 const float *coeffs[2];
570 tag = s->chan_map[i+1];
571 chans = tag == TYPE_CPE ? 2 : 1;
573 memset(cpe->is_mask, 0, sizeof(cpe->is_mask));
574 memset(cpe->ms_mask, 0, sizeof(cpe->ms_mask));
575 put_bits(&s->pb, 3, tag);
576 put_bits(&s->pb, 4, chan_el_counter[tag]++);
577 for (ch = 0; ch < chans; ch++) {
579 coeffs[ch] = sce->coeffs;
580 sce->ics.predictor_present = 0;
581 memset(&sce->ics.prediction_used, 0, sizeof(sce->ics.prediction_used));
582 memset(&sce->tns, 0, sizeof(TemporalNoiseShaping));
583 for (w = 0; w < 128; w++)
584 if (sce->band_type[w] > RESERVED_BT)
585 sce->band_type[w] = 0;
587 s->psy.model->analyze(&s->psy, start_ch, coeffs, wi);
588 for (ch = 0; ch < chans; ch++) {
589 s->cur_channel = start_ch + ch;
590 s->coder->search_for_quantizers(avctx, s, &cpe->ch[ch], s->lambda);
592 cpe->common_window = 0;
594 && wi[0].window_type[0] == wi[1].window_type[0]
595 && wi[0].window_shape == wi[1].window_shape) {
597 cpe->common_window = 1;
598 for (w = 0; w < wi[0].num_windows; w++) {
599 if (wi[0].grouping[w] != wi[1].grouping[w]) {
600 cpe->common_window = 0;
605 for (ch = 0; ch < chans; ch++) {
607 s->cur_channel = start_ch + ch;
608 if (s->options.pns && s->coder->search_for_pns)
609 s->coder->search_for_pns(s, avctx, sce);
610 if (s->options.tns && s->coder->search_for_tns)
611 s->coder->search_for_tns(s, sce);
612 if (s->options.pred && s->coder->search_for_pred)
613 s->coder->search_for_pred(s, sce);
614 if (sce->tns.present)
616 if (sce->ics.predictor_present)
619 s->cur_channel = start_ch;
620 if (s->options.stereo_mode && cpe->common_window) {
621 if (s->options.stereo_mode > 0) {
622 IndividualChannelStream *ics = &cpe->ch[0].ics;
623 for (w = 0; w < ics->num_windows; w += ics->group_len[w])
624 for (g = 0; g < ics->num_swb; g++)
625 cpe->ms_mask[w*16+g] = 1;
626 } else if (s->coder->search_for_ms) {
627 s->coder->search_for_ms(s, cpe);
630 if (s->options.intensity_stereo && s->coder->search_for_is) {
631 s->coder->search_for_is(s, avctx, cpe);
632 if (cpe->is_mode) is_mode = 1;
634 if (s->options.pred && s->coder->adjust_common_prediction)
635 s->coder->adjust_common_prediction(s, cpe);
636 if (s->coder->set_special_band_scalefactors)
637 for (ch = 0; ch < chans; ch++)
638 s->coder->set_special_band_scalefactors(s, &cpe->ch[ch]);
639 if (s->options.pred && s->coder->apply_main_pred)
640 for (ch = 0; ch < chans; ch++)
641 s->coder->apply_main_pred(s, &cpe->ch[ch]);
642 adjust_frame_information(cpe, chans);
644 put_bits(&s->pb, 1, cpe->common_window);
645 if (cpe->common_window) {
646 put_ics_info(s, &cpe->ch[0].ics);
647 if (s->coder->encode_main_pred)
648 s->coder->encode_main_pred(s, &cpe->ch[0]);
649 encode_ms_info(&s->pb, cpe);
650 if (cpe->ms_mode) ms_mode = 1;
653 for (ch = 0; ch < chans; ch++) {
654 s->cur_channel = start_ch + ch;
655 encode_individual_channel(avctx, s, &cpe->ch[ch], cpe->common_window);
660 frame_bits = put_bits_count(&s->pb);
661 if (frame_bits <= 6144 * s->channels - 3) {
662 s->psy.bitres.bits = frame_bits / s->channels;
665 if (is_mode || ms_mode || tns_mode || pred_mode) {
666 for (i = 0; i < s->chan_map[0]; i++) {
667 // Must restore coeffs
668 chans = tag == TYPE_CPE ? 2 : 1;
670 for (ch = 0; ch < chans; ch++)
671 memcpy(cpe->ch[ch].coeffs, cpe->ch[ch].pcoeffs, sizeof(cpe->ch[ch].coeffs));
675 s->lambda *= avctx->bit_rate * 1024.0f / avctx->sample_rate / frame_bits;
679 // update predictor state
680 if (s->options.pred && s->coder->update_main_pred) {
681 for (i = 0; i < s->chan_map[0]; i++) {
683 for (ch = 0; ch < chans; ch++)
684 s->coder->update_main_pred(s, &cpe->ch[ch],
685 (cpe->common_window && !ch) ? cpe : NULL);
689 put_bits(&s->pb, 3, TYPE_END);
690 flush_put_bits(&s->pb);
691 avctx->frame_bits = put_bits_count(&s->pb);
693 // rate control stuff
694 if (!(avctx->flags & AV_CODEC_FLAG_QSCALE)) {
695 float ratio = avctx->bit_rate * 1024.0f / avctx->sample_rate / avctx->frame_bits;
697 s->lambda = FFMIN(s->lambda, 65536.f);
703 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
706 avpkt->size = put_bits_count(&s->pb) >> 3;
711 static av_cold int aac_encode_end(AVCodecContext *avctx)
713 AACEncContext *s = avctx->priv_data;
715 ff_mdct_end(&s->mdct1024);
716 ff_mdct_end(&s->mdct128);
720 ff_psy_preprocess_end(s->psypp);
721 av_freep(&s->buffer.samples);
724 ff_af_queue_close(&s->afq);
728 static av_cold int dsp_init(AVCodecContext *avctx, AACEncContext *s)
732 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
734 return AVERROR(ENOMEM);
737 ff_kbd_window_init(ff_aac_kbd_long_1024, 4.0, 1024);
738 ff_kbd_window_init(ff_aac_kbd_short_128, 6.0, 128);
739 ff_init_ff_sine_windows(10);
740 ff_init_ff_sine_windows(7);
742 if ((ret = ff_mdct_init(&s->mdct1024, 11, 0, 32768.0)) < 0)
744 if ((ret = ff_mdct_init(&s->mdct128, 8, 0, 32768.0)) < 0)
750 static av_cold int alloc_buffers(AVCodecContext *avctx, AACEncContext *s)
753 FF_ALLOCZ_ARRAY_OR_GOTO(avctx, s->buffer.samples, s->channels, 3 * 1024 * sizeof(s->buffer.samples[0]), alloc_fail);
754 FF_ALLOCZ_ARRAY_OR_GOTO(avctx, s->cpe, s->chan_map[0], sizeof(ChannelElement), alloc_fail);
755 FF_ALLOCZ_OR_GOTO(avctx, avctx->extradata, 5 + AV_INPUT_BUFFER_PADDING_SIZE, alloc_fail);
757 for(ch = 0; ch < s->channels; ch++)
758 s->planar_samples[ch] = s->buffer.samples + 3 * 1024 * ch;
762 return AVERROR(ENOMEM);
765 static av_cold int aac_encode_init(AVCodecContext *avctx)
767 AACEncContext *s = avctx->priv_data;
769 const uint8_t *sizes[2];
770 uint8_t grouping[AAC_MAX_CHANNELS];
773 avctx->frame_size = 1024;
775 for (i = 0; i < 16; i++)
776 if (avctx->sample_rate == avpriv_mpeg4audio_sample_rates[i])
779 s->channels = avctx->channels;
781 ERROR_IF(i == 16 || i >= ff_aac_swb_size_1024_len || i >= ff_aac_swb_size_128_len,
782 "Unsupported sample rate %d\n", avctx->sample_rate);
783 ERROR_IF(s->channels > AAC_MAX_CHANNELS,
784 "Unsupported number of channels: %d\n", s->channels);
785 WARN_IF(1024.0 * avctx->bit_rate / avctx->sample_rate > 6144 * s->channels,
786 "Too many bits per frame requested, clamping to max\n");
787 if (avctx->profile == FF_PROFILE_AAC_MAIN) {
789 } else if (avctx->profile == FF_PROFILE_AAC_LOW && s->options.pred) {
790 s->profile = 0; /* Main */
791 WARN_IF(1, "Prediction requested, changing profile to AAC-Main\n");
792 } else if (avctx->profile == FF_PROFILE_AAC_LOW ||
793 avctx->profile == FF_PROFILE_UNKNOWN) {
794 s->profile = 1; /* Low */
796 ERROR_IF(1, "Unsupported profile %d\n", avctx->profile);
799 avctx->bit_rate = (int)FFMIN(
800 6144 * s->channels / 1024.0 * avctx->sample_rate,
803 s->samplerate_index = i;
805 s->chan_map = aac_chan_configs[s->channels-1];
807 if ((ret = dsp_init(avctx, s)) < 0)
810 if ((ret = alloc_buffers(avctx, s)) < 0)
813 avctx->extradata_size = 5;
814 put_audio_specific_config(avctx);
816 sizes[0] = ff_aac_swb_size_1024[i];
817 sizes[1] = ff_aac_swb_size_128[i];
818 lengths[0] = ff_aac_num_swb_1024[i];
819 lengths[1] = ff_aac_num_swb_128[i];
820 for (i = 0; i < s->chan_map[0]; i++)
821 grouping[i] = s->chan_map[i + 1] == TYPE_CPE;
822 if ((ret = ff_psy_init(&s->psy, avctx, 2, sizes, lengths,
823 s->chan_map[0], grouping)) < 0)
825 s->psypp = ff_psy_preprocess_init(avctx);
826 s->coder = &ff_aac_coders[s->options.aac_coder];
827 ff_lpc_init(&s->lpc, avctx->frame_size, TNS_MAX_ORDER, FF_LPC_TYPE_LEVINSON);
830 ff_aac_coder_init_mips(s);
832 s->lambda = avctx->global_quality > 0 ? avctx->global_quality : 120;
836 avctx->initial_padding = 1024;
837 ff_af_queue_init(avctx, &s->afq);
841 aac_encode_end(avctx);
845 #define AACENC_FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
846 static const AVOption aacenc_options[] = {
847 {"stereo_mode", "Stereo coding method", offsetof(AACEncContext, options.stereo_mode), AV_OPT_TYPE_INT, {.i64 = 0}, -1, 1, AACENC_FLAGS, "stereo_mode"},
848 {"auto", "Selected by the Encoder", 0, AV_OPT_TYPE_CONST, {.i64 = -1 }, INT_MIN, INT_MAX, AACENC_FLAGS, "stereo_mode"},
849 {"ms_off", "Disable Mid/Side coding", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, INT_MIN, INT_MAX, AACENC_FLAGS, "stereo_mode"},
850 {"ms_force", "Force Mid/Side for the whole frame if possible", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, INT_MIN, INT_MAX, AACENC_FLAGS, "stereo_mode"},
851 {"aac_coder", "Coding algorithm", offsetof(AACEncContext, options.aac_coder), AV_OPT_TYPE_INT, {.i64 = AAC_CODER_TWOLOOP}, 0, AAC_CODER_NB-1, AACENC_FLAGS, "aac_coder"},
852 {"faac", "FAAC-inspired method", 0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_FAAC}, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_coder"},
853 {"anmr", "ANMR method", 0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_ANMR}, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_coder"},
854 {"twoloop", "Two loop searching method", 0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_TWOLOOP}, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_coder"},
855 {"fast", "Constant quantizer", 0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_FAST}, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_coder"},
856 {"aac_pns", "Perceptual Noise Substitution", offsetof(AACEncContext, options.pns), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AACENC_FLAGS, "aac_pns"},
857 {"disable", "Disable perceptual noise substitution", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_pns"},
858 {"enable", "Enable perceptual noise substitution", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_pns"},
859 {"aac_is", "Intensity stereo coding", offsetof(AACEncContext, options.intensity_stereo), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AACENC_FLAGS, "intensity_stereo"},
860 {"disable", "Disable intensity stereo coding", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, AACENC_FLAGS, "intensity_stereo"},
861 {"enable", "Enable intensity stereo coding", 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, AACENC_FLAGS, "intensity_stereo"},
862 {"aac_tns", "Temporal noise shaping", offsetof(AACEncContext, options.tns), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AACENC_FLAGS, "aac_tns"},
863 {"disable", "Disable temporal noise shaping", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_tns"},
864 {"enable", "Enable temporal noise shaping", 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_tns"},
865 {"aac_pred", "AAC-Main prediction", offsetof(AACEncContext, options.pred), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AACENC_FLAGS, "aac_pred"},
866 {"disable", "Disable AAC-Main prediction", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_pred"},
867 {"enable", "Enable AAC-Main prediction", 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_pred"},
871 static const AVClass aacenc_class = {
873 av_default_item_name,
875 LIBAVUTIL_VERSION_INT,
878 AVCodec ff_aac_encoder = {
880 .long_name = NULL_IF_CONFIG_SMALL("AAC (Advanced Audio Coding)"),
881 .type = AVMEDIA_TYPE_AUDIO,
882 .id = AV_CODEC_ID_AAC,
883 .priv_data_size = sizeof(AACEncContext),
884 .init = aac_encode_init,
885 .encode2 = aac_encode_frame,
886 .close = aac_encode_end,
887 .supported_samplerates = mpeg4audio_sample_rates,
888 .capabilities = AV_CODEC_CAP_SMALL_LAST_FRAME | AV_CODEC_CAP_DELAY |
889 AV_CODEC_CAP_EXPERIMENTAL,
890 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
891 AV_SAMPLE_FMT_NONE },
892 .priv_class = &aacenc_class,