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@ -27,8 +27,7 @@ |
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/***********************************
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* TODOs: |
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* psy model selection with some option |
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* change greedy codebook search into something more optimal, like Viterbi algorithm |
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* determine run lengths along with codebook |
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* add sane pulse detection |
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***********************************/ |
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#include "avcodec.h" |
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@ -129,6 +128,16 @@ static const uint8_t aac_chan_configs[6][5] = { |
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{4, ID_SCE, ID_CPE, ID_CPE, ID_LFE}, // 6 channels - front center + stereo + back stereo + LFE
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}; |
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/**
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* AAC encoder context |
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*/ |
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typedef struct { |
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PutBitContext pb; |
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MDCTContext mdct1024; ///< long (1024 samples) frame transform context
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MDCTContext mdct128; ///< short (128 samples) frame transform context
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DSPContext dsp; |
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} AACEncContext; |
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/**
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* Make AAC audio config object. |
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* @see 1.6.2.1 "Syntax - AudioSpecificConfig" |
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@ -176,6 +185,11 @@ static av_cold int aac_encode_init(AVCodecContext *avctx) |
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dsputil_init(&s->dsp, avctx); |
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ff_mdct_init(&s->mdct1024, 11, 0); |
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ff_mdct_init(&s->mdct128, 8, 0); |
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// window init
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ff_kbd_window_init(ff_aac_kbd_long_1024, 4.0, 1024); |
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ff_kbd_window_init(ff_aac_kbd_short_128, 6.0, 128); |
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ff_sine_window_init(ff_sine_1024, 1024); |
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ff_sine_window_init(ff_sine_128, 128); |
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s->samples = av_malloc(2 * 1024 * avctx->channels * sizeof(s->samples[0])); |
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s->cpe = av_mallocz(sizeof(ChannelElement) * aac_chan_configs[avctx->channels-1][0]); |
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@ -211,6 +225,48 @@ static void put_ics_info(AVCodecContext *avctx, IndividualChannelStream *info) |
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} |
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} |
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/**
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* Encode pulse data. |
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*/ |
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static void encode_pulses(AVCodecContext *avctx, AACEncContext *s, Pulse *pulse, int channel) |
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{ |
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int i; |
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put_bits(&s->pb, 1, !!pulse->num_pulse); |
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if(!pulse->num_pulse) return; |
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put_bits(&s->pb, 2, pulse->num_pulse - 1); |
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put_bits(&s->pb, 6, pulse->start); |
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for(i = 0; i < pulse->num_pulse; i++){ |
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put_bits(&s->pb, 5, pulse->offset[i]); |
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put_bits(&s->pb, 4, pulse->amp[i]); |
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} |
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} |
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/**
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* Encode spectral coefficients processed by psychoacoustic model. |
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*/ |
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static void encode_spectral_coeffs(AVCodecContext *avctx, AACEncContext *s, ChannelElement *cpe, int channel) |
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{ |
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int start, i, w, w2, wg; |
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w = 0; |
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for(wg = 0; wg < cpe->ch[channel].ics.num_window_groups; wg++){ |
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start = 0; |
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for(i = 0; i < cpe->ch[channel].ics.max_sfb; i++){ |
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if(cpe->ch[channel].zeroes[w][i]){ |
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start += cpe->ch[channel].ics.swb_sizes[i]; |
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continue; |
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} |
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for(w2 = w; w2 < w + cpe->ch[channel].ics.group_len[wg]; w2++){ |
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encode_band_coeffs(s, cpe, channel, start + w2*128, cpe->ch[channel].ics.swb_sizes[i], cpe->ch[channel].band_type[w][i]); |
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} |
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start += cpe->ch[channel].ics.swb_sizes[i]; |
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} |
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w += cpe->ch[channel].ics.group_len[wg]; |
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} |
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} |
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/**
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* Write some auxiliary information about the created AAC file. |
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*/ |
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