341b28c0d2
within this loop, we can move its declaration there too. This fixes bitstream desync when decoding streams containing CCEs. Based on a patch by Alex Converse (alex converse gmail com) Originally committed as revision 15364 to svn://svn.ffmpeg.org/ffmpeg/trunk
1471 lines
54 KiB
C
1471 lines
54 KiB
C
/*
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* AAC decoder
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* Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
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* Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file aac.c
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* AAC decoder
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* @author Oded Shimon ( ods15 ods15 dyndns org )
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* @author Maxim Gavrilov ( maxim.gavrilov gmail com )
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*/
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/*
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* supported tools
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*
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* Support? Name
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* N (code in SoC repo) gain control
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* Y block switching
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* Y window shapes - standard
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* N window shapes - Low Delay
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* Y filterbank - standard
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* N (code in SoC repo) filterbank - Scalable Sample Rate
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* Y Temporal Noise Shaping
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* N (code in SoC repo) Long Term Prediction
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* Y intensity stereo
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* Y channel coupling
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* N frequency domain prediction
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* Y Perceptual Noise Substitution
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* Y Mid/Side stereo
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* N Scalable Inverse AAC Quantization
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* N Frequency Selective Switch
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* N upsampling filter
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* Y quantization & coding - AAC
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* N quantization & coding - TwinVQ
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* N quantization & coding - BSAC
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* N AAC Error Resilience tools
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* N Error Resilience payload syntax
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* N Error Protection tool
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* N CELP
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* N Silence Compression
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* N HVXC
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* N HVXC 4kbits/s VR
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* N Structured Audio tools
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* N Structured Audio Sample Bank Format
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* N MIDI
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* N Harmonic and Individual Lines plus Noise
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* N Text-To-Speech Interface
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* N (in progress) Spectral Band Replication
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* Y (not in this code) Layer-1
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* Y (not in this code) Layer-2
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* Y (not in this code) Layer-3
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* N SinuSoidal Coding (Transient, Sinusoid, Noise)
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* N (planned) Parametric Stereo
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* N Direct Stream Transfer
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*
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* Note: - HE AAC v1 comprises LC AAC with Spectral Band Replication.
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* - HE AAC v2 comprises LC AAC with Spectral Band Replication and
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Parametric Stereo.
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*/
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#include "avcodec.h"
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#include "bitstream.h"
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#include "dsputil.h"
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#include "lpc.h"
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#include "aac.h"
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#include "aactab.h"
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#include "aacdectab.h"
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#include "mpeg4audio.h"
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#include <assert.h>
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#include <errno.h>
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#include <math.h>
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#include <string.h>
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static VLC vlc_scalefactors;
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static VLC vlc_spectral[11];
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/**
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* Configure output channel order based on the current program configuration element.
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*
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* @param che_pos current channel position configuration
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* @param new_che_pos New channel position configuration - we only do something if it differs from the current one.
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*
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* @return Returns error status. 0 - OK, !0 - error
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*/
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static int output_configure(AACContext *ac, enum ChannelPosition che_pos[4][MAX_ELEM_ID],
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enum ChannelPosition new_che_pos[4][MAX_ELEM_ID]) {
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AVCodecContext *avctx = ac->avccontext;
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int i, type, channels = 0;
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if(!memcmp(che_pos, new_che_pos, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0])))
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return 0; /* no change */
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memcpy(che_pos, new_che_pos, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0]));
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/* Allocate or free elements depending on if they are in the
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* current program configuration.
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*
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* Set up default 1:1 output mapping.
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*
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* For a 5.1 stream the output order will be:
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* [ Center ] [ Front Left ] [ Front Right ] [ LFE ] [ Surround Left ] [ Surround Right ]
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*/
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for(i = 0; i < MAX_ELEM_ID; i++) {
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for(type = 0; type < 4; type++) {
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if(che_pos[type][i]) {
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if(!ac->che[type][i] && !(ac->che[type][i] = av_mallocz(sizeof(ChannelElement))))
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return AVERROR(ENOMEM);
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if(type != TYPE_CCE) {
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ac->output_data[channels++] = ac->che[type][i]->ch[0].ret;
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if(type == TYPE_CPE) {
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ac->output_data[channels++] = ac->che[type][i]->ch[1].ret;
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}
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}
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} else
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av_freep(&ac->che[type][i]);
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}
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}
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avctx->channels = channels;
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return 0;
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}
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/**
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* Decode an array of 4 bit element IDs, optionally interleaved with a stereo/mono switching bit.
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*
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* @param cpe_map Stereo (Channel Pair Element) map, NULL if stereo bit is not present.
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* @param sce_map mono (Single Channel Element) map
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* @param type speaker type/position for these channels
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*/
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static void decode_channel_map(enum ChannelPosition *cpe_map,
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enum ChannelPosition *sce_map, enum ChannelPosition type, GetBitContext * gb, int n) {
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while(n--) {
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enum ChannelPosition *map = cpe_map && get_bits1(gb) ? cpe_map : sce_map; // stereo or mono map
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map[get_bits(gb, 4)] = type;
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}
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}
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/**
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* Decode program configuration element; reference: table 4.2.
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*
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* @param new_che_pos New channel position configuration - we only do something if it differs from the current one.
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*
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* @return Returns error status. 0 - OK, !0 - error
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*/
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static int decode_pce(AACContext * ac, enum ChannelPosition new_che_pos[4][MAX_ELEM_ID],
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GetBitContext * gb) {
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int num_front, num_side, num_back, num_lfe, num_assoc_data, num_cc;
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skip_bits(gb, 2); // object_type
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ac->m4ac.sampling_index = get_bits(gb, 4);
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if(ac->m4ac.sampling_index > 11) {
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av_log(ac->avccontext, AV_LOG_ERROR, "invalid sampling rate index %d\n", ac->m4ac.sampling_index);
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return -1;
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}
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ac->m4ac.sample_rate = ff_mpeg4audio_sample_rates[ac->m4ac.sampling_index];
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num_front = get_bits(gb, 4);
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num_side = get_bits(gb, 4);
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num_back = get_bits(gb, 4);
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num_lfe = get_bits(gb, 2);
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num_assoc_data = get_bits(gb, 3);
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num_cc = get_bits(gb, 4);
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if (get_bits1(gb))
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skip_bits(gb, 4); // mono_mixdown_tag
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if (get_bits1(gb))
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skip_bits(gb, 4); // stereo_mixdown_tag
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if (get_bits1(gb))
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skip_bits(gb, 3); // mixdown_coeff_index and pseudo_surround
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decode_channel_map(new_che_pos[TYPE_CPE], new_che_pos[TYPE_SCE], AAC_CHANNEL_FRONT, gb, num_front);
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decode_channel_map(new_che_pos[TYPE_CPE], new_che_pos[TYPE_SCE], AAC_CHANNEL_SIDE, gb, num_side );
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decode_channel_map(new_che_pos[TYPE_CPE], new_che_pos[TYPE_SCE], AAC_CHANNEL_BACK, gb, num_back );
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decode_channel_map(NULL, new_che_pos[TYPE_LFE], AAC_CHANNEL_LFE, gb, num_lfe );
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skip_bits_long(gb, 4 * num_assoc_data);
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decode_channel_map(new_che_pos[TYPE_CCE], new_che_pos[TYPE_CCE], AAC_CHANNEL_CC, gb, num_cc );
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align_get_bits(gb);
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/* comment field, first byte is length */
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skip_bits_long(gb, 8 * get_bits(gb, 8));
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return 0;
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}
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/**
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* Set up channel positions based on a default channel configuration
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* as specified in table 1.17.
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*
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* @param new_che_pos New channel position configuration - we only do something if it differs from the current one.
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*
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* @return Returns error status. 0 - OK, !0 - error
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*/
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static int set_default_channel_config(AACContext *ac, enum ChannelPosition new_che_pos[4][MAX_ELEM_ID],
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int channel_config)
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{
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if(channel_config < 1 || channel_config > 7) {
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av_log(ac->avccontext, AV_LOG_ERROR, "invalid default channel configuration (%d)\n",
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channel_config);
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return -1;
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}
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/* default channel configurations:
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*
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* 1ch : front center (mono)
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* 2ch : L + R (stereo)
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* 3ch : front center + L + R
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* 4ch : front center + L + R + back center
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* 5ch : front center + L + R + back stereo
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* 6ch : front center + L + R + back stereo + LFE
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* 7ch : front center + L + R + outer front left + outer front right + back stereo + LFE
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*/
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if(channel_config != 2)
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new_che_pos[TYPE_SCE][0] = AAC_CHANNEL_FRONT; // front center (or mono)
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if(channel_config > 1)
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new_che_pos[TYPE_CPE][0] = AAC_CHANNEL_FRONT; // L + R (or stereo)
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if(channel_config == 4)
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new_che_pos[TYPE_SCE][1] = AAC_CHANNEL_BACK; // back center
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if(channel_config > 4)
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new_che_pos[TYPE_CPE][(channel_config == 7) + 1]
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= AAC_CHANNEL_BACK; // back stereo
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if(channel_config > 5)
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new_che_pos[TYPE_LFE][0] = AAC_CHANNEL_LFE; // LFE
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if(channel_config == 7)
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new_che_pos[TYPE_CPE][1] = AAC_CHANNEL_FRONT; // outer front left + outer front right
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return 0;
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}
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/**
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* Decode GA "General Audio" specific configuration; reference: table 4.1.
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*
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* @return Returns error status. 0 - OK, !0 - error
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*/
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static int decode_ga_specific_config(AACContext * ac, GetBitContext * gb, int channel_config) {
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enum ChannelPosition new_che_pos[4][MAX_ELEM_ID];
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int extension_flag, ret;
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if(get_bits1(gb)) { // frameLengthFlag
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av_log_missing_feature(ac->avccontext, "960/120 MDCT window is", 1);
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return -1;
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}
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if (get_bits1(gb)) // dependsOnCoreCoder
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skip_bits(gb, 14); // coreCoderDelay
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extension_flag = get_bits1(gb);
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if(ac->m4ac.object_type == AOT_AAC_SCALABLE ||
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ac->m4ac.object_type == AOT_ER_AAC_SCALABLE)
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skip_bits(gb, 3); // layerNr
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memset(new_che_pos, 0, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0]));
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if (channel_config == 0) {
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skip_bits(gb, 4); // element_instance_tag
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if((ret = decode_pce(ac, new_che_pos, gb)))
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return ret;
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} else {
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if((ret = set_default_channel_config(ac, new_che_pos, channel_config)))
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return ret;
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}
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if((ret = output_configure(ac, ac->che_pos, new_che_pos)))
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return ret;
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if (extension_flag) {
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switch (ac->m4ac.object_type) {
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case AOT_ER_BSAC:
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skip_bits(gb, 5); // numOfSubFrame
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skip_bits(gb, 11); // layer_length
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break;
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case AOT_ER_AAC_LC:
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case AOT_ER_AAC_LTP:
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case AOT_ER_AAC_SCALABLE:
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case AOT_ER_AAC_LD:
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skip_bits(gb, 3); /* aacSectionDataResilienceFlag
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* aacScalefactorDataResilienceFlag
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* aacSpectralDataResilienceFlag
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*/
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break;
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}
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skip_bits1(gb); // extensionFlag3 (TBD in version 3)
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}
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return 0;
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}
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/**
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* Decode audio specific configuration; reference: table 1.13.
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*
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* @param data pointer to AVCodecContext extradata
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* @param data_size size of AVCCodecContext extradata
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*
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* @return Returns error status. 0 - OK, !0 - error
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*/
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static int decode_audio_specific_config(AACContext * ac, void *data, int data_size) {
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GetBitContext gb;
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int i;
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init_get_bits(&gb, data, data_size * 8);
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if((i = ff_mpeg4audio_get_config(&ac->m4ac, data, data_size)) < 0)
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return -1;
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if(ac->m4ac.sampling_index > 11) {
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av_log(ac->avccontext, AV_LOG_ERROR, "invalid sampling rate index %d\n", ac->m4ac.sampling_index);
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return -1;
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}
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skip_bits_long(&gb, i);
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switch (ac->m4ac.object_type) {
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case AOT_AAC_LC:
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if (decode_ga_specific_config(ac, &gb, ac->m4ac.chan_config))
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return -1;
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break;
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default:
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av_log(ac->avccontext, AV_LOG_ERROR, "Audio object type %s%d is not supported.\n",
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ac->m4ac.sbr == 1? "SBR+" : "", ac->m4ac.object_type);
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return -1;
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}
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return 0;
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}
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/**
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* linear congruential pseudorandom number generator
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*
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* @param previous_val pointer to the current state of the generator
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*
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* @return Returns a 32-bit pseudorandom integer
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*/
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static av_always_inline int lcg_random(int previous_val) {
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return previous_val * 1664525 + 1013904223;
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}
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static av_cold int aac_decode_init(AVCodecContext * avccontext) {
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AACContext * ac = avccontext->priv_data;
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int i;
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ac->avccontext = avccontext;
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if (avccontext->extradata_size <= 0 ||
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decode_audio_specific_config(ac, avccontext->extradata, avccontext->extradata_size))
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return -1;
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avccontext->sample_fmt = SAMPLE_FMT_S16;
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avccontext->sample_rate = ac->m4ac.sample_rate;
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avccontext->frame_size = 1024;
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AAC_INIT_VLC_STATIC( 0, 144);
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AAC_INIT_VLC_STATIC( 1, 114);
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AAC_INIT_VLC_STATIC( 2, 188);
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AAC_INIT_VLC_STATIC( 3, 180);
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AAC_INIT_VLC_STATIC( 4, 172);
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AAC_INIT_VLC_STATIC( 5, 140);
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AAC_INIT_VLC_STATIC( 6, 168);
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AAC_INIT_VLC_STATIC( 7, 114);
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AAC_INIT_VLC_STATIC( 8, 262);
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AAC_INIT_VLC_STATIC( 9, 248);
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AAC_INIT_VLC_STATIC(10, 384);
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dsputil_init(&ac->dsp, avccontext);
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ac->random_state = 0x1f2e3d4c;
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// -1024 - Compensate wrong IMDCT method.
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// 32768 - Required to scale values to the correct range for the bias method
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// for float to int16 conversion.
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if(ac->dsp.float_to_int16 == ff_float_to_int16_c) {
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ac->add_bias = 385.0f;
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ac->sf_scale = 1. / (-1024. * 32768.);
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ac->sf_offset = 0;
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} else {
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ac->add_bias = 0.0f;
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ac->sf_scale = 1. / -1024.;
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ac->sf_offset = 60;
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}
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#ifndef CONFIG_HARDCODED_TABLES
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for (i = 0; i < 316; i++)
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ff_aac_pow2sf_tab[i] = pow(2, (i - 200)/4.);
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#endif /* CONFIG_HARDCODED_TABLES */
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INIT_VLC_STATIC(&vlc_scalefactors, 7, sizeof(ff_aac_scalefactor_code)/sizeof(ff_aac_scalefactor_code[0]),
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ff_aac_scalefactor_bits, sizeof(ff_aac_scalefactor_bits[0]), sizeof(ff_aac_scalefactor_bits[0]),
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ff_aac_scalefactor_code, sizeof(ff_aac_scalefactor_code[0]), sizeof(ff_aac_scalefactor_code[0]),
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352);
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ff_mdct_init(&ac->mdct, 11, 1);
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ff_mdct_init(&ac->mdct_small, 8, 1);
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// window initialization
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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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return 0;
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}
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/**
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* Skip data_stream_element; reference: table 4.10.
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*/
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static void skip_data_stream_element(GetBitContext * gb) {
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int byte_align = get_bits1(gb);
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int count = get_bits(gb, 8);
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if (count == 255)
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count += get_bits(gb, 8);
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if (byte_align)
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align_get_bits(gb);
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skip_bits_long(gb, 8 * count);
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}
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/**
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* Decode Individual Channel Stream info; reference: table 4.6.
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*
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* @param common_window Channels have independent [0], or shared [1], Individual Channel Stream information.
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*/
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static int decode_ics_info(AACContext * ac, IndividualChannelStream * ics, GetBitContext * gb, int common_window) {
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if (get_bits1(gb)) {
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av_log(ac->avccontext, AV_LOG_ERROR, "Reserved bit set.\n");
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memset(ics, 0, sizeof(IndividualChannelStream));
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return -1;
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}
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ics->window_sequence[1] = ics->window_sequence[0];
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ics->window_sequence[0] = get_bits(gb, 2);
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ics->use_kb_window[1] = ics->use_kb_window[0];
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ics->use_kb_window[0] = get_bits1(gb);
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ics->num_window_groups = 1;
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ics->group_len[0] = 1;
|
|
if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
|
|
int i;
|
|
ics->max_sfb = get_bits(gb, 4);
|
|
for (i = 0; i < 7; i++) {
|
|
if (get_bits1(gb)) {
|
|
ics->group_len[ics->num_window_groups-1]++;
|
|
} else {
|
|
ics->num_window_groups++;
|
|
ics->group_len[ics->num_window_groups-1] = 1;
|
|
}
|
|
}
|
|
ics->num_windows = 8;
|
|
ics->swb_offset = swb_offset_128[ac->m4ac.sampling_index];
|
|
ics->num_swb = ff_aac_num_swb_128[ac->m4ac.sampling_index];
|
|
ics->tns_max_bands = tns_max_bands_128[ac->m4ac.sampling_index];
|
|
} else {
|
|
ics->max_sfb = get_bits(gb, 6);
|
|
ics->num_windows = 1;
|
|
ics->swb_offset = swb_offset_1024[ac->m4ac.sampling_index];
|
|
ics->num_swb = ff_aac_num_swb_1024[ac->m4ac.sampling_index];
|
|
ics->tns_max_bands = tns_max_bands_1024[ac->m4ac.sampling_index];
|
|
if (get_bits1(gb)) {
|
|
av_log_missing_feature(ac->avccontext, "Predictor bit set but LTP is", 1);
|
|
memset(ics, 0, sizeof(IndividualChannelStream));
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if(ics->max_sfb > ics->num_swb) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR,
|
|
"Number of scalefactor bands in group (%d) exceeds limit (%d).\n",
|
|
ics->max_sfb, ics->num_swb);
|
|
memset(ics, 0, sizeof(IndividualChannelStream));
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Decode band types (section_data payload); reference: table 4.46.
|
|
*
|
|
* @param band_type array of the used band type
|
|
* @param band_type_run_end array of the last scalefactor band of a band type run
|
|
*
|
|
* @return Returns error status. 0 - OK, !0 - error
|
|
*/
|
|
static int decode_band_types(AACContext * ac, enum BandType band_type[120],
|
|
int band_type_run_end[120], GetBitContext * gb, IndividualChannelStream * ics) {
|
|
int g, idx = 0;
|
|
const int bits = (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) ? 3 : 5;
|
|
for (g = 0; g < ics->num_window_groups; g++) {
|
|
int k = 0;
|
|
while (k < ics->max_sfb) {
|
|
uint8_t sect_len = k;
|
|
int sect_len_incr;
|
|
int sect_band_type = get_bits(gb, 4);
|
|
if (sect_band_type == 12) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR, "invalid band type\n");
|
|
return -1;
|
|
}
|
|
while ((sect_len_incr = get_bits(gb, bits)) == (1 << bits)-1)
|
|
sect_len += sect_len_incr;
|
|
sect_len += sect_len_incr;
|
|
if (sect_len > ics->max_sfb) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR,
|
|
"Number of bands (%d) exceeds limit (%d).\n",
|
|
sect_len, ics->max_sfb);
|
|
return -1;
|
|
}
|
|
for (; k < sect_len; k++) {
|
|
band_type [idx] = sect_band_type;
|
|
band_type_run_end[idx++] = sect_len;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Decode scalefactors; reference: table 4.47.
|
|
*
|
|
* @param global_gain first scalefactor value as scalefactors are differentially coded
|
|
* @param band_type array of the used band type
|
|
* @param band_type_run_end array of the last scalefactor band of a band type run
|
|
* @param sf array of scalefactors or intensity stereo positions
|
|
*
|
|
* @return Returns error status. 0 - OK, !0 - error
|
|
*/
|
|
static int decode_scalefactors(AACContext * ac, float sf[120], GetBitContext * gb,
|
|
unsigned int global_gain, IndividualChannelStream * ics,
|
|
enum BandType band_type[120], int band_type_run_end[120]) {
|
|
const int sf_offset = ac->sf_offset + (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE ? 12 : 0);
|
|
int g, i, idx = 0;
|
|
int offset[3] = { global_gain, global_gain - 90, 100 };
|
|
int noise_flag = 1;
|
|
static const char *sf_str[3] = { "Global gain", "Noise gain", "Intensity stereo position" };
|
|
for (g = 0; g < ics->num_window_groups; g++) {
|
|
for (i = 0; i < ics->max_sfb;) {
|
|
int run_end = band_type_run_end[idx];
|
|
if (band_type[idx] == ZERO_BT) {
|
|
for(; i < run_end; i++, idx++)
|
|
sf[idx] = 0.;
|
|
}else if((band_type[idx] == INTENSITY_BT) || (band_type[idx] == INTENSITY_BT2)) {
|
|
for(; i < run_end; i++, idx++) {
|
|
offset[2] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
|
|
if(offset[2] > 255U) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR,
|
|
"%s (%d) out of range.\n", sf_str[2], offset[2]);
|
|
return -1;
|
|
}
|
|
sf[idx] = ff_aac_pow2sf_tab[-offset[2] + 300];
|
|
}
|
|
}else if(band_type[idx] == NOISE_BT) {
|
|
for(; i < run_end; i++, idx++) {
|
|
if(noise_flag-- > 0)
|
|
offset[1] += get_bits(gb, 9) - 256;
|
|
else
|
|
offset[1] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
|
|
if(offset[1] > 255U) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR,
|
|
"%s (%d) out of range.\n", sf_str[1], offset[1]);
|
|
return -1;
|
|
}
|
|
sf[idx] = -ff_aac_pow2sf_tab[ offset[1] + sf_offset];
|
|
}
|
|
}else {
|
|
for(; i < run_end; i++, idx++) {
|
|
offset[0] += get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
|
|
if(offset[0] > 255U) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR,
|
|
"%s (%d) out of range.\n", sf_str[0], offset[0]);
|
|
return -1;
|
|
}
|
|
sf[idx] = -ff_aac_pow2sf_tab[ offset[0] + sf_offset];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Decode pulse data; reference: table 4.7.
|
|
*/
|
|
static int decode_pulses(Pulse * pulse, GetBitContext * gb, const uint16_t * swb_offset, int num_swb) {
|
|
int i, pulse_swb;
|
|
pulse->num_pulse = get_bits(gb, 2) + 1;
|
|
pulse_swb = get_bits(gb, 6);
|
|
if (pulse_swb >= num_swb)
|
|
return -1;
|
|
pulse->pos[0] = swb_offset[pulse_swb];
|
|
pulse->pos[0] += get_bits(gb, 5);
|
|
if (pulse->pos[0] > 1023)
|
|
return -1;
|
|
pulse->amp[0] = get_bits(gb, 4);
|
|
for (i = 1; i < pulse->num_pulse; i++) {
|
|
pulse->pos[i] = get_bits(gb, 5) + pulse->pos[i-1];
|
|
if (pulse->pos[i] > 1023)
|
|
return -1;
|
|
pulse->amp[i] = get_bits(gb, 4);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Decode Temporal Noise Shaping data; reference: table 4.48.
|
|
*
|
|
* @return Returns error status. 0 - OK, !0 - error
|
|
*/
|
|
static int decode_tns(AACContext * ac, TemporalNoiseShaping * tns,
|
|
GetBitContext * gb, const IndividualChannelStream * ics) {
|
|
int w, filt, i, coef_len, coef_res, coef_compress;
|
|
const int is8 = ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE;
|
|
const int tns_max_order = is8 ? 7 : ac->m4ac.object_type == AOT_AAC_MAIN ? 20 : 12;
|
|
for (w = 0; w < ics->num_windows; w++) {
|
|
if ((tns->n_filt[w] = get_bits(gb, 2 - is8))) {
|
|
coef_res = get_bits1(gb);
|
|
|
|
for (filt = 0; filt < tns->n_filt[w]; filt++) {
|
|
int tmp2_idx;
|
|
tns->length[w][filt] = get_bits(gb, 6 - 2*is8);
|
|
|
|
if ((tns->order[w][filt] = get_bits(gb, 5 - 2*is8)) > tns_max_order) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR, "TNS filter order %d is greater than maximum %d.",
|
|
tns->order[w][filt], tns_max_order);
|
|
tns->order[w][filt] = 0;
|
|
return -1;
|
|
}
|
|
if (tns->order[w][filt]) {
|
|
tns->direction[w][filt] = get_bits1(gb);
|
|
coef_compress = get_bits1(gb);
|
|
coef_len = coef_res + 3 - coef_compress;
|
|
tmp2_idx = 2*coef_compress + coef_res;
|
|
|
|
for (i = 0; i < tns->order[w][filt]; i++)
|
|
tns->coef[w][filt][i] = tns_tmp2_map[tmp2_idx][get_bits(gb, coef_len)];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Decode Mid/Side data; reference: table 4.54.
|
|
*
|
|
* @param ms_present Indicates mid/side stereo presence. [0] mask is all 0s;
|
|
* [1] mask is decoded from bitstream; [2] mask is all 1s;
|
|
* [3] reserved for scalable AAC
|
|
*/
|
|
static void decode_mid_side_stereo(ChannelElement * cpe, GetBitContext * gb,
|
|
int ms_present) {
|
|
int idx;
|
|
if (ms_present == 1) {
|
|
for (idx = 0; idx < cpe->ch[0].ics.num_window_groups * cpe->ch[0].ics.max_sfb; idx++)
|
|
cpe->ms_mask[idx] = get_bits1(gb);
|
|
} else if (ms_present == 2) {
|
|
memset(cpe->ms_mask, 1, cpe->ch[0].ics.num_window_groups * cpe->ch[0].ics.max_sfb * sizeof(cpe->ms_mask[0]));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Decode spectral data; reference: table 4.50.
|
|
* Dequantize and scale spectral data; reference: 4.6.3.3.
|
|
*
|
|
* @param coef array of dequantized, scaled spectral data
|
|
* @param sf array of scalefactors or intensity stereo positions
|
|
* @param pulse_present set if pulses are present
|
|
* @param pulse pointer to pulse data struct
|
|
* @param band_type array of the used band type
|
|
*
|
|
* @return Returns error status. 0 - OK, !0 - error
|
|
*/
|
|
static int decode_spectrum_and_dequant(AACContext * ac, float coef[1024], GetBitContext * gb, float sf[120],
|
|
int pulse_present, const Pulse * pulse, const IndividualChannelStream * ics, enum BandType band_type[120]) {
|
|
int i, k, g, idx = 0;
|
|
const int c = 1024/ics->num_windows;
|
|
const uint16_t * offsets = ics->swb_offset;
|
|
float *coef_base = coef;
|
|
|
|
for (g = 0; g < ics->num_windows; g++)
|
|
memset(coef + g * 128 + offsets[ics->max_sfb], 0, sizeof(float)*(c - offsets[ics->max_sfb]));
|
|
|
|
for (g = 0; g < ics->num_window_groups; g++) {
|
|
for (i = 0; i < ics->max_sfb; i++, idx++) {
|
|
const int cur_band_type = band_type[idx];
|
|
const int dim = cur_band_type >= FIRST_PAIR_BT ? 2 : 4;
|
|
const int is_cb_unsigned = IS_CODEBOOK_UNSIGNED(cur_band_type);
|
|
int group;
|
|
if (cur_band_type == ZERO_BT) {
|
|
for (group = 0; group < ics->group_len[g]; group++) {
|
|
memset(coef + group * 128 + offsets[i], 0, (offsets[i+1] - offsets[i])*sizeof(float));
|
|
}
|
|
}else if (cur_band_type == NOISE_BT) {
|
|
const float scale = sf[idx] / ((offsets[i+1] - offsets[i]) * PNS_MEAN_ENERGY);
|
|
for (group = 0; group < ics->group_len[g]; group++) {
|
|
for (k = offsets[i]; k < offsets[i+1]; k++) {
|
|
ac->random_state = lcg_random(ac->random_state);
|
|
coef[group*128+k] = ac->random_state * scale;
|
|
}
|
|
}
|
|
}else if (cur_band_type != INTENSITY_BT2 && cur_band_type != INTENSITY_BT) {
|
|
for (group = 0; group < ics->group_len[g]; group++) {
|
|
for (k = offsets[i]; k < offsets[i+1]; k += dim) {
|
|
const int index = get_vlc2(gb, vlc_spectral[cur_band_type - 1].table, 6, 3);
|
|
const int coef_tmp_idx = (group << 7) + k;
|
|
const float *vq_ptr;
|
|
int j;
|
|
if(index >= ff_aac_spectral_sizes[cur_band_type - 1]) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR,
|
|
"Read beyond end of ff_aac_codebook_vectors[%d][]. index %d >= %d\n",
|
|
cur_band_type - 1, index, ff_aac_spectral_sizes[cur_band_type - 1]);
|
|
return -1;
|
|
}
|
|
vq_ptr = &ff_aac_codebook_vectors[cur_band_type - 1][index * dim];
|
|
if (is_cb_unsigned) {
|
|
for (j = 0; j < dim; j++)
|
|
if (vq_ptr[j])
|
|
coef[coef_tmp_idx + j] = 1 - 2*(int)get_bits1(gb);
|
|
}else {
|
|
for (j = 0; j < dim; j++)
|
|
coef[coef_tmp_idx + j] = 1.0f;
|
|
}
|
|
if (cur_band_type == ESC_BT) {
|
|
for (j = 0; j < 2; j++) {
|
|
if (vq_ptr[j] == 64.0f) {
|
|
int n = 4;
|
|
/* The total length of escape_sequence must be < 22 bits according
|
|
to the specification (i.e. max is 11111111110xxxxxxxxxx). */
|
|
while (get_bits1(gb) && n < 15) n++;
|
|
if(n == 15) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR, "error in spectral data, ESC overflow\n");
|
|
return -1;
|
|
}
|
|
n = (1<<n) + get_bits(gb, n);
|
|
coef[coef_tmp_idx + j] *= cbrtf(fabsf(n)) * n;
|
|
}else
|
|
coef[coef_tmp_idx + j] *= vq_ptr[j];
|
|
}
|
|
}else
|
|
for (j = 0; j < dim; j++)
|
|
coef[coef_tmp_idx + j] *= vq_ptr[j];
|
|
for (j = 0; j < dim; j++)
|
|
coef[coef_tmp_idx + j] *= sf[idx];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
coef += ics->group_len[g]<<7;
|
|
}
|
|
|
|
if (pulse_present) {
|
|
idx = 0;
|
|
for(i = 0; i < pulse->num_pulse; i++){
|
|
float co = coef_base[ pulse->pos[i] ];
|
|
while(offsets[idx + 1] <= pulse->pos[i])
|
|
idx++;
|
|
if (band_type[idx] != NOISE_BT && sf[idx]) {
|
|
float ico = -pulse->amp[i];
|
|
if (co) {
|
|
co /= sf[idx];
|
|
ico = co / sqrtf(sqrtf(fabsf(co))) + (co > 0 ? -ico : ico);
|
|
}
|
|
coef_base[ pulse->pos[i] ] = cbrtf(fabsf(ico)) * ico * sf[idx];
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Decode an individual_channel_stream payload; reference: table 4.44.
|
|
*
|
|
* @param common_window Channels have independent [0], or shared [1], Individual Channel Stream information.
|
|
* @param scale_flag scalable [1] or non-scalable [0] AAC (Unused until scalable AAC is implemented.)
|
|
*
|
|
* @return Returns error status. 0 - OK, !0 - error
|
|
*/
|
|
static int decode_ics(AACContext * ac, SingleChannelElement * sce, GetBitContext * gb, int common_window, int scale_flag) {
|
|
Pulse pulse;
|
|
TemporalNoiseShaping * tns = &sce->tns;
|
|
IndividualChannelStream * ics = &sce->ics;
|
|
float * out = sce->coeffs;
|
|
int global_gain, pulse_present = 0;
|
|
|
|
/* This assignment is to silence a GCC warning about the variable being used
|
|
* uninitialized when in fact it always is.
|
|
*/
|
|
pulse.num_pulse = 0;
|
|
|
|
global_gain = get_bits(gb, 8);
|
|
|
|
if (!common_window && !scale_flag) {
|
|
if (decode_ics_info(ac, ics, gb, 0) < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (decode_band_types(ac, sce->band_type, sce->band_type_run_end, gb, ics) < 0)
|
|
return -1;
|
|
if (decode_scalefactors(ac, sce->sf, gb, global_gain, ics, sce->band_type, sce->band_type_run_end) < 0)
|
|
return -1;
|
|
|
|
pulse_present = 0;
|
|
if (!scale_flag) {
|
|
if ((pulse_present = get_bits1(gb))) {
|
|
if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR, "Pulse tool not allowed in eight short sequence.\n");
|
|
return -1;
|
|
}
|
|
if (decode_pulses(&pulse, gb, ics->swb_offset, ics->num_swb)) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR, "Pulse data corrupt or invalid.\n");
|
|
return -1;
|
|
}
|
|
}
|
|
if ((tns->present = get_bits1(gb)) && decode_tns(ac, tns, gb, ics))
|
|
return -1;
|
|
if (get_bits1(gb)) {
|
|
av_log_missing_feature(ac->avccontext, "SSR", 1);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (decode_spectrum_and_dequant(ac, out, gb, sce->sf, pulse_present, &pulse, ics, sce->band_type) < 0)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Mid/Side stereo decoding; reference: 4.6.8.1.3.
|
|
*/
|
|
static void apply_mid_side_stereo(ChannelElement * cpe) {
|
|
const IndividualChannelStream * ics = &cpe->ch[0].ics;
|
|
float *ch0 = cpe->ch[0].coeffs;
|
|
float *ch1 = cpe->ch[1].coeffs;
|
|
int g, i, k, group, idx = 0;
|
|
const uint16_t * offsets = ics->swb_offset;
|
|
for (g = 0; g < ics->num_window_groups; g++) {
|
|
for (i = 0; i < ics->max_sfb; i++, idx++) {
|
|
if (cpe->ms_mask[idx] &&
|
|
cpe->ch[0].band_type[idx] < NOISE_BT && cpe->ch[1].band_type[idx] < NOISE_BT) {
|
|
for (group = 0; group < ics->group_len[g]; group++) {
|
|
for (k = offsets[i]; k < offsets[i+1]; k++) {
|
|
float tmp = ch0[group*128 + k] - ch1[group*128 + k];
|
|
ch0[group*128 + k] += ch1[group*128 + k];
|
|
ch1[group*128 + k] = tmp;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ch0 += ics->group_len[g]*128;
|
|
ch1 += ics->group_len[g]*128;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* intensity stereo decoding; reference: 4.6.8.2.3
|
|
*
|
|
* @param ms_present Indicates mid/side stereo presence. [0] mask is all 0s;
|
|
* [1] mask is decoded from bitstream; [2] mask is all 1s;
|
|
* [3] reserved for scalable AAC
|
|
*/
|
|
static void apply_intensity_stereo(ChannelElement * cpe, int ms_present) {
|
|
const IndividualChannelStream * ics = &cpe->ch[1].ics;
|
|
SingleChannelElement * sce1 = &cpe->ch[1];
|
|
float *coef0 = cpe->ch[0].coeffs, *coef1 = cpe->ch[1].coeffs;
|
|
const uint16_t * offsets = ics->swb_offset;
|
|
int g, group, i, k, idx = 0;
|
|
int c;
|
|
float scale;
|
|
for (g = 0; g < ics->num_window_groups; g++) {
|
|
for (i = 0; i < ics->max_sfb;) {
|
|
if (sce1->band_type[idx] == INTENSITY_BT || sce1->band_type[idx] == INTENSITY_BT2) {
|
|
const int bt_run_end = sce1->band_type_run_end[idx];
|
|
for (; i < bt_run_end; i++, idx++) {
|
|
c = -1 + 2 * (sce1->band_type[idx] - 14);
|
|
if (ms_present)
|
|
c *= 1 - 2 * cpe->ms_mask[idx];
|
|
scale = c * sce1->sf[idx];
|
|
for (group = 0; group < ics->group_len[g]; group++)
|
|
for (k = offsets[i]; k < offsets[i+1]; k++)
|
|
coef1[group*128 + k] = scale * coef0[group*128 + k];
|
|
}
|
|
} else {
|
|
int bt_run_end = sce1->band_type_run_end[idx];
|
|
idx += bt_run_end - i;
|
|
i = bt_run_end;
|
|
}
|
|
}
|
|
coef0 += ics->group_len[g]*128;
|
|
coef1 += ics->group_len[g]*128;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Decode a channel_pair_element; reference: table 4.4.
|
|
*
|
|
* @param elem_id Identifies the instance of a syntax element.
|
|
*
|
|
* @return Returns error status. 0 - OK, !0 - error
|
|
*/
|
|
static int decode_cpe(AACContext * ac, GetBitContext * gb, int elem_id) {
|
|
int i, ret, common_window, ms_present = 0;
|
|
ChannelElement * cpe;
|
|
|
|
cpe = ac->che[TYPE_CPE][elem_id];
|
|
common_window = get_bits1(gb);
|
|
if (common_window) {
|
|
if (decode_ics_info(ac, &cpe->ch[0].ics, gb, 1))
|
|
return -1;
|
|
i = cpe->ch[1].ics.use_kb_window[0];
|
|
cpe->ch[1].ics = cpe->ch[0].ics;
|
|
cpe->ch[1].ics.use_kb_window[1] = i;
|
|
ms_present = get_bits(gb, 2);
|
|
if(ms_present == 3) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR, "ms_present = 3 is reserved.\n");
|
|
return -1;
|
|
} else if(ms_present)
|
|
decode_mid_side_stereo(cpe, gb, ms_present);
|
|
}
|
|
if ((ret = decode_ics(ac, &cpe->ch[0], gb, common_window, 0)))
|
|
return ret;
|
|
if ((ret = decode_ics(ac, &cpe->ch[1], gb, common_window, 0)))
|
|
return ret;
|
|
|
|
if (common_window && ms_present)
|
|
apply_mid_side_stereo(cpe);
|
|
|
|
apply_intensity_stereo(cpe, ms_present);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Decode coupling_channel_element; reference: table 4.8.
|
|
*
|
|
* @param elem_id Identifies the instance of a syntax element.
|
|
*
|
|
* @return Returns error status. 0 - OK, !0 - error
|
|
*/
|
|
static int decode_cce(AACContext * ac, GetBitContext * gb, ChannelElement * che) {
|
|
int num_gain = 0;
|
|
int c, g, sfb, ret;
|
|
int sign;
|
|
float scale;
|
|
SingleChannelElement * sce = &che->ch[0];
|
|
ChannelCoupling * coup = &che->coup;
|
|
|
|
coup->coupling_point = 2*get_bits1(gb);
|
|
coup->num_coupled = get_bits(gb, 3);
|
|
for (c = 0; c <= coup->num_coupled; c++) {
|
|
num_gain++;
|
|
coup->type[c] = get_bits1(gb) ? TYPE_CPE : TYPE_SCE;
|
|
coup->id_select[c] = get_bits(gb, 4);
|
|
if (coup->type[c] == TYPE_CPE) {
|
|
coup->ch_select[c] = get_bits(gb, 2);
|
|
if (coup->ch_select[c] == 3)
|
|
num_gain++;
|
|
} else
|
|
coup->ch_select[c] = 1;
|
|
}
|
|
coup->coupling_point += get_bits1(gb);
|
|
|
|
if (coup->coupling_point == 2) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR,
|
|
"Independently switched CCE with 'invalid' domain signalled.\n");
|
|
memset(coup, 0, sizeof(ChannelCoupling));
|
|
return -1;
|
|
}
|
|
|
|
sign = get_bits(gb, 1);
|
|
scale = pow(2., pow(2., (int)get_bits(gb, 2) - 3));
|
|
|
|
if ((ret = decode_ics(ac, sce, gb, 0, 0)))
|
|
return ret;
|
|
|
|
for (c = 0; c < num_gain; c++) {
|
|
int idx = 0;
|
|
int cge = 1;
|
|
int gain = 0;
|
|
float gain_cache = 1.;
|
|
if (c) {
|
|
cge = coup->coupling_point == AFTER_IMDCT ? 1 : get_bits1(gb);
|
|
gain = cge ? get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60: 0;
|
|
gain_cache = pow(scale, gain);
|
|
}
|
|
for (g = 0; g < sce->ics.num_window_groups; g++) {
|
|
for (sfb = 0; sfb < sce->ics.max_sfb; sfb++, idx++) {
|
|
if (sce->band_type[idx] != ZERO_BT) {
|
|
if (!cge) {
|
|
int t = get_vlc2(gb, vlc_scalefactors.table, 7, 3) - 60;
|
|
if (t) {
|
|
int s = 1;
|
|
if (sign) {
|
|
s -= 2 * (t & 0x1);
|
|
t >>= 1;
|
|
}
|
|
gain += t;
|
|
gain_cache = pow(scale, gain) * s;
|
|
}
|
|
}
|
|
coup->gain[c][idx] = gain_cache;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Decode Spectral Band Replication extension data; reference: table 4.55.
|
|
*
|
|
* @param crc flag indicating the presence of CRC checksum
|
|
* @param cnt length of TYPE_FIL syntactic element in bytes
|
|
*
|
|
* @return Returns number of bytes consumed from the TYPE_FIL element.
|
|
*/
|
|
static int decode_sbr_extension(AACContext * ac, GetBitContext * gb, int crc, int cnt) {
|
|
// TODO : sbr_extension implementation
|
|
av_log_missing_feature(ac->avccontext, "SBR", 0);
|
|
skip_bits_long(gb, 8*cnt - 4); // -4 due to reading extension type
|
|
return cnt;
|
|
}
|
|
|
|
/**
|
|
* Parse whether channels are to be excluded from Dynamic Range Compression; reference: table 4.53.
|
|
*
|
|
* @return Returns number of bytes consumed.
|
|
*/
|
|
static int decode_drc_channel_exclusions(DynamicRangeControl *che_drc, GetBitContext * gb) {
|
|
int i;
|
|
int num_excl_chan = 0;
|
|
|
|
do {
|
|
for (i = 0; i < 7; i++)
|
|
che_drc->exclude_mask[num_excl_chan++] = get_bits1(gb);
|
|
} while (num_excl_chan < MAX_CHANNELS - 7 && get_bits1(gb));
|
|
|
|
return num_excl_chan / 7;
|
|
}
|
|
|
|
/**
|
|
* Decode dynamic range information; reference: table 4.52.
|
|
*
|
|
* @param cnt length of TYPE_FIL syntactic element in bytes
|
|
*
|
|
* @return Returns number of bytes consumed.
|
|
*/
|
|
static int decode_dynamic_range(DynamicRangeControl *che_drc, GetBitContext * gb, int cnt) {
|
|
int n = 1;
|
|
int drc_num_bands = 1;
|
|
int i;
|
|
|
|
/* pce_tag_present? */
|
|
if(get_bits1(gb)) {
|
|
che_drc->pce_instance_tag = get_bits(gb, 4);
|
|
skip_bits(gb, 4); // tag_reserved_bits
|
|
n++;
|
|
}
|
|
|
|
/* excluded_chns_present? */
|
|
if(get_bits1(gb)) {
|
|
n += decode_drc_channel_exclusions(che_drc, gb);
|
|
}
|
|
|
|
/* drc_bands_present? */
|
|
if (get_bits1(gb)) {
|
|
che_drc->band_incr = get_bits(gb, 4);
|
|
che_drc->interpolation_scheme = get_bits(gb, 4);
|
|
n++;
|
|
drc_num_bands += che_drc->band_incr;
|
|
for (i = 0; i < drc_num_bands; i++) {
|
|
che_drc->band_top[i] = get_bits(gb, 8);
|
|
n++;
|
|
}
|
|
}
|
|
|
|
/* prog_ref_level_present? */
|
|
if (get_bits1(gb)) {
|
|
che_drc->prog_ref_level = get_bits(gb, 7);
|
|
skip_bits1(gb); // prog_ref_level_reserved_bits
|
|
n++;
|
|
}
|
|
|
|
for (i = 0; i < drc_num_bands; i++) {
|
|
che_drc->dyn_rng_sgn[i] = get_bits1(gb);
|
|
che_drc->dyn_rng_ctl[i] = get_bits(gb, 7);
|
|
n++;
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
/**
|
|
* Decode extension data (incomplete); reference: table 4.51.
|
|
*
|
|
* @param cnt length of TYPE_FIL syntactic element in bytes
|
|
*
|
|
* @return Returns number of bytes consumed
|
|
*/
|
|
static int decode_extension_payload(AACContext * ac, GetBitContext * gb, int cnt) {
|
|
int crc_flag = 0;
|
|
int res = cnt;
|
|
switch (get_bits(gb, 4)) { // extension type
|
|
case EXT_SBR_DATA_CRC:
|
|
crc_flag++;
|
|
case EXT_SBR_DATA:
|
|
res = decode_sbr_extension(ac, gb, crc_flag, cnt);
|
|
break;
|
|
case EXT_DYNAMIC_RANGE:
|
|
res = decode_dynamic_range(&ac->che_drc, gb, cnt);
|
|
break;
|
|
case EXT_FILL:
|
|
case EXT_FILL_DATA:
|
|
case EXT_DATA_ELEMENT:
|
|
default:
|
|
skip_bits_long(gb, 8*cnt - 4);
|
|
break;
|
|
};
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* Decode Temporal Noise Shaping filter coefficients and apply all-pole filters; reference: 4.6.9.3.
|
|
*
|
|
* @param decode 1 if tool is used normally, 0 if tool is used in LTP.
|
|
* @param coef spectral coefficients
|
|
*/
|
|
static void apply_tns(float coef[1024], TemporalNoiseShaping * tns, IndividualChannelStream * ics, int decode) {
|
|
const int mmm = FFMIN(ics->tns_max_bands, ics->max_sfb);
|
|
int w, filt, m, i;
|
|
int bottom, top, order, start, end, size, inc;
|
|
float lpc[TNS_MAX_ORDER];
|
|
|
|
for (w = 0; w < ics->num_windows; w++) {
|
|
bottom = ics->num_swb;
|
|
for (filt = 0; filt < tns->n_filt[w]; filt++) {
|
|
top = bottom;
|
|
bottom = FFMAX(0, top - tns->length[w][filt]);
|
|
order = tns->order[w][filt];
|
|
if (order == 0)
|
|
continue;
|
|
|
|
// tns_decode_coef
|
|
compute_lpc_coefs(tns->coef[w][filt], order, lpc, 0, 0, 0);
|
|
|
|
start = ics->swb_offset[FFMIN(bottom, mmm)];
|
|
end = ics->swb_offset[FFMIN( top, mmm)];
|
|
if ((size = end - start) <= 0)
|
|
continue;
|
|
if (tns->direction[w][filt]) {
|
|
inc = -1; start = end - 1;
|
|
} else {
|
|
inc = 1;
|
|
}
|
|
start += w * 128;
|
|
|
|
// ar filter
|
|
for (m = 0; m < size; m++, start += inc)
|
|
for (i = 1; i <= FFMIN(m, order); i++)
|
|
coef[start] -= coef[start - i*inc] * lpc[i-1];
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Conduct IMDCT and windowing.
|
|
*/
|
|
static void imdct_and_windowing(AACContext * ac, SingleChannelElement * sce) {
|
|
IndividualChannelStream * ics = &sce->ics;
|
|
float * in = sce->coeffs;
|
|
float * out = sce->ret;
|
|
float * saved = sce->saved;
|
|
const float * swindow = ics->use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
|
|
const float * lwindow_prev = ics->use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024;
|
|
const float * swindow_prev = ics->use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128;
|
|
float * buf = ac->buf_mdct;
|
|
DECLARE_ALIGNED(16, float, temp[128]);
|
|
int i;
|
|
|
|
// imdct
|
|
if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
|
|
if (ics->window_sequence[1] == ONLY_LONG_SEQUENCE || ics->window_sequence[1] == LONG_STOP_SEQUENCE)
|
|
av_log(ac->avccontext, AV_LOG_WARNING,
|
|
"Transition from an ONLY_LONG or LONG_STOP to an EIGHT_SHORT sequence detected. "
|
|
"If you heard an audible artifact, please submit the sample to the FFmpeg developers.\n");
|
|
for (i = 0; i < 1024; i += 128)
|
|
ff_imdct_half(&ac->mdct_small, buf + i, in + i);
|
|
} else
|
|
ff_imdct_half(&ac->mdct, buf, in);
|
|
|
|
/* window overlapping
|
|
* NOTE: To simplify the overlapping code, all 'meaningless' short to long
|
|
* and long to short transitions are considered to be short to short
|
|
* transitions. This leaves just two cases (long to long and short to short)
|
|
* with a little special sauce for EIGHT_SHORT_SEQUENCE.
|
|
*/
|
|
if ((ics->window_sequence[1] == ONLY_LONG_SEQUENCE || ics->window_sequence[1] == LONG_STOP_SEQUENCE) &&
|
|
(ics->window_sequence[0] == ONLY_LONG_SEQUENCE || ics->window_sequence[0] == LONG_START_SEQUENCE)) {
|
|
ac->dsp.vector_fmul_window( out, saved, buf, lwindow_prev, ac->add_bias, 512);
|
|
} else {
|
|
for (i = 0; i < 448; i++)
|
|
out[i] = saved[i] + ac->add_bias;
|
|
|
|
if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
|
|
ac->dsp.vector_fmul_window(out + 448 + 0*128, saved + 448, buf + 0*128, swindow_prev, ac->add_bias, 64);
|
|
ac->dsp.vector_fmul_window(out + 448 + 1*128, buf + 0*128 + 64, buf + 1*128, swindow, ac->add_bias, 64);
|
|
ac->dsp.vector_fmul_window(out + 448 + 2*128, buf + 1*128 + 64, buf + 2*128, swindow, ac->add_bias, 64);
|
|
ac->dsp.vector_fmul_window(out + 448 + 3*128, buf + 2*128 + 64, buf + 3*128, swindow, ac->add_bias, 64);
|
|
ac->dsp.vector_fmul_window(temp, buf + 3*128 + 64, buf + 4*128, swindow, ac->add_bias, 64);
|
|
memcpy( out + 448 + 4*128, temp, 64 * sizeof(float));
|
|
} else {
|
|
ac->dsp.vector_fmul_window(out + 448, saved + 448, buf, swindow_prev, ac->add_bias, 64);
|
|
for (i = 576; i < 1024; i++)
|
|
out[i] = buf[i-512] + ac->add_bias;
|
|
}
|
|
}
|
|
|
|
// buffer update
|
|
if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
|
|
for (i = 0; i < 64; i++)
|
|
saved[i] = temp[64 + i] - ac->add_bias;
|
|
ac->dsp.vector_fmul_window(saved + 64, buf + 4*128 + 64, buf + 5*128, swindow, 0, 64);
|
|
ac->dsp.vector_fmul_window(saved + 192, buf + 5*128 + 64, buf + 6*128, swindow, 0, 64);
|
|
ac->dsp.vector_fmul_window(saved + 320, buf + 6*128 + 64, buf + 7*128, swindow, 0, 64);
|
|
memcpy( saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
|
|
} else if (ics->window_sequence[0] == LONG_START_SEQUENCE) {
|
|
memcpy( saved, buf + 512, 448 * sizeof(float));
|
|
memcpy( saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
|
|
} else { // LONG_STOP or ONLY_LONG
|
|
memcpy( saved, buf + 512, 512 * sizeof(float));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Apply dependent channel coupling (applied before IMDCT).
|
|
*
|
|
* @param index index into coupling gain array
|
|
*/
|
|
static void apply_dependent_coupling(AACContext * ac, SingleChannelElement * sce, ChannelElement * cc, int index) {
|
|
IndividualChannelStream * ics = &cc->ch[0].ics;
|
|
const uint16_t * offsets = ics->swb_offset;
|
|
float * dest = sce->coeffs;
|
|
const float * src = cc->ch[0].coeffs;
|
|
int g, i, group, k, idx = 0;
|
|
if(ac->m4ac.object_type == AOT_AAC_LTP) {
|
|
av_log(ac->avccontext, AV_LOG_ERROR,
|
|
"Dependent coupling is not supported together with LTP\n");
|
|
return;
|
|
}
|
|
for (g = 0; g < ics->num_window_groups; g++) {
|
|
for (i = 0; i < ics->max_sfb; i++, idx++) {
|
|
if (cc->ch[0].band_type[idx] != ZERO_BT) {
|
|
for (group = 0; group < ics->group_len[g]; group++) {
|
|
for (k = offsets[i]; k < offsets[i+1]; k++) {
|
|
// XXX dsputil-ize
|
|
dest[group*128+k] += cc->coup.gain[index][idx] * src[group*128+k];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
dest += ics->group_len[g]*128;
|
|
src += ics->group_len[g]*128;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Apply independent channel coupling (applied after IMDCT).
|
|
*
|
|
* @param index index into coupling gain array
|
|
*/
|
|
static void apply_independent_coupling(AACContext * ac, SingleChannelElement * sce, ChannelElement * cc, int index) {
|
|
int i;
|
|
for (i = 0; i < 1024; i++)
|
|
sce->ret[i] += cc->coup.gain[index][0] * (cc->ch[0].ret[i] - ac->add_bias);
|
|
}
|
|
|
|
/**
|
|
* channel coupling transformation interface
|
|
*
|
|
* @param index index into coupling gain array
|
|
* @param apply_coupling_method pointer to (in)dependent coupling function
|
|
*/
|
|
static void apply_channel_coupling(AACContext * ac, ChannelElement * cc,
|
|
void (*apply_coupling_method)(AACContext * ac, SingleChannelElement * sce, ChannelElement * cc, int index))
|
|
{
|
|
int c;
|
|
int index = 0;
|
|
ChannelCoupling * coup = &cc->coup;
|
|
for (c = 0; c <= coup->num_coupled; c++) {
|
|
if (ac->che[coup->type[c]][coup->id_select[c]]) {
|
|
if (coup->ch_select[c] != 2) {
|
|
apply_coupling_method(ac, &ac->che[coup->type[c]][coup->id_select[c]]->ch[0], cc, index);
|
|
if (coup->ch_select[c] != 0)
|
|
index++;
|
|
}
|
|
if (coup->ch_select[c] != 1)
|
|
apply_coupling_method(ac, &ac->che[coup->type[c]][coup->id_select[c]]->ch[1], cc, index++);
|
|
} else {
|
|
av_log(ac->avccontext, AV_LOG_ERROR,
|
|
"coupling target %sE[%d] not available\n",
|
|
coup->type[c] == TYPE_CPE ? "CP" : "SC", coup->id_select[c]);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Convert spectral data to float samples, applying all supported tools as appropriate.
|
|
*/
|
|
static void spectral_to_sample(AACContext * ac) {
|
|
int i, type;
|
|
for (i = 0; i < MAX_ELEM_ID; i++) {
|
|
for(type = 0; type < 4; type++) {
|
|
ChannelElement *che = ac->che[type][i];
|
|
if(che) {
|
|
if(che->coup.coupling_point == BEFORE_TNS)
|
|
apply_channel_coupling(ac, che, apply_dependent_coupling);
|
|
if(che->ch[0].tns.present)
|
|
apply_tns(che->ch[0].coeffs, &che->ch[0].tns, &che->ch[0].ics, 1);
|
|
if(che->ch[1].tns.present)
|
|
apply_tns(che->ch[1].coeffs, &che->ch[1].tns, &che->ch[1].ics, 1);
|
|
if(che->coup.coupling_point == BETWEEN_TNS_AND_IMDCT)
|
|
apply_channel_coupling(ac, che, apply_dependent_coupling);
|
|
imdct_and_windowing(ac, &che->ch[0]);
|
|
if(type == TYPE_CPE)
|
|
imdct_and_windowing(ac, &che->ch[1]);
|
|
if(che->coup.coupling_point == AFTER_IMDCT)
|
|
apply_channel_coupling(ac, che, apply_independent_coupling);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int aac_decode_frame(AVCodecContext * avccontext, void * data, int * data_size, const uint8_t * buf, int buf_size) {
|
|
AACContext * ac = avccontext->priv_data;
|
|
GetBitContext gb;
|
|
enum RawDataBlockType elem_type;
|
|
int err, elem_id, data_size_tmp;
|
|
|
|
init_get_bits(&gb, buf, buf_size*8);
|
|
|
|
// parse
|
|
while ((elem_type = get_bits(&gb, 3)) != TYPE_END) {
|
|
elem_id = get_bits(&gb, 4);
|
|
err = -1;
|
|
|
|
if(elem_type == TYPE_SCE && elem_id == 1 &&
|
|
!ac->che[TYPE_SCE][elem_id] && ac->che[TYPE_LFE][0]) {
|
|
/* Some streams incorrectly code 5.1 audio as SCE[0] CPE[0] CPE[1] SCE[1]
|
|
instead of SCE[0] CPE[0] CPE[0] LFE[0]. If we seem to have
|
|
encountered such a stream, transfer the LFE[0] element to SCE[1] */
|
|
ac->che[TYPE_SCE][elem_id] = ac->che[TYPE_LFE][0];
|
|
ac->che[TYPE_LFE][0] = NULL;
|
|
}
|
|
if(elem_type < TYPE_DSE) {
|
|
if(!ac->che[elem_type][elem_id])
|
|
return -1;
|
|
if(elem_type != TYPE_CCE)
|
|
ac->che[elem_type][elem_id]->coup.coupling_point = 4;
|
|
}
|
|
|
|
switch (elem_type) {
|
|
|
|
case TYPE_SCE:
|
|
err = decode_ics(ac, &ac->che[TYPE_SCE][elem_id]->ch[0], &gb, 0, 0);
|
|
break;
|
|
|
|
case TYPE_CPE:
|
|
err = decode_cpe(ac, &gb, elem_id);
|
|
break;
|
|
|
|
case TYPE_CCE:
|
|
err = decode_cce(ac, &gb, ac->che[TYPE_CCE][elem_id]);
|
|
break;
|
|
|
|
case TYPE_LFE:
|
|
err = decode_ics(ac, &ac->che[TYPE_LFE][elem_id]->ch[0], &gb, 0, 0);
|
|
break;
|
|
|
|
case TYPE_DSE:
|
|
skip_data_stream_element(&gb);
|
|
err = 0;
|
|
break;
|
|
|
|
case TYPE_PCE:
|
|
{
|
|
enum ChannelPosition new_che_pos[4][MAX_ELEM_ID];
|
|
memset(new_che_pos, 0, 4 * MAX_ELEM_ID * sizeof(new_che_pos[0][0]));
|
|
if((err = decode_pce(ac, new_che_pos, &gb)))
|
|
break;
|
|
err = output_configure(ac, ac->che_pos, new_che_pos);
|
|
break;
|
|
}
|
|
|
|
case TYPE_FIL:
|
|
if (elem_id == 15)
|
|
elem_id += get_bits(&gb, 8) - 1;
|
|
while (elem_id > 0)
|
|
elem_id -= decode_extension_payload(ac, &gb, elem_id);
|
|
err = 0; /* FIXME */
|
|
break;
|
|
|
|
default:
|
|
err = -1; /* should not happen, but keeps compiler happy */
|
|
break;
|
|
}
|
|
|
|
if(err)
|
|
return err;
|
|
}
|
|
|
|
spectral_to_sample(ac);
|
|
|
|
if (!ac->is_saved) {
|
|
ac->is_saved = 1;
|
|
*data_size = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
data_size_tmp = 1024 * avccontext->channels * sizeof(int16_t);
|
|
if(*data_size < data_size_tmp) {
|
|
av_log(avccontext, AV_LOG_ERROR,
|
|
"Output buffer too small (%d) or trying to output too many samples (%d) for this frame.\n",
|
|
*data_size, data_size_tmp);
|
|
return -1;
|
|
}
|
|
*data_size = data_size_tmp;
|
|
|
|
ac->dsp.float_to_int16_interleave(data, (const float **)ac->output_data, 1024, avccontext->channels);
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold int aac_decode_close(AVCodecContext * avccontext) {
|
|
AACContext * ac = avccontext->priv_data;
|
|
int i, type;
|
|
|
|
for (i = 0; i < MAX_ELEM_ID; i++) {
|
|
for(type = 0; type < 4; type++)
|
|
av_freep(&ac->che[type][i]);
|
|
}
|
|
|
|
ff_mdct_end(&ac->mdct);
|
|
ff_mdct_end(&ac->mdct_small);
|
|
return 0 ;
|
|
}
|
|
|
|
AVCodec aac_decoder = {
|
|
"aac",
|
|
CODEC_TYPE_AUDIO,
|
|
CODEC_ID_AAC,
|
|
sizeof(AACContext),
|
|
aac_decode_init,
|
|
NULL,
|
|
aac_decode_close,
|
|
aac_decode_frame,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Advanced Audio Coding"),
|
|
.sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
|
|
};
|