aacenc.h

Go to the documentation of this file.

/*
 * AAC encoder
 * Copyright (C) 2008 Konstantin Shishkov
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_AACENC_H
#define AVCODEC_AACENC_H

#include "libavutil/float_dsp.h"
#include "avcodec.h"
#include "put_bits.h"

#include "aac.h"
#include "audio_frame_queue.h"
#include "psymodel.h"

#include "lpc.h"

typedef enum AACCoder {
    AAC_CODER_ANMR = 0,
    AAC_CODER_TWOLOOP,
    AAC_CODER_FAST,

    AAC_CODER_NB,
}AACCoder;

typedef struct AACEncOptions {
    int coder;
    int pns;
    int tns;
    int ltp;
    int pce;
    int pred;
    int mid_side;
    int intensity_stereo;
} AACEncOptions;

struct AACEncContext;

typedef struct AACCoefficientsEncoder {
    void (*search_for_quantizers)(AVCodecContext *avctx, struct AACEncContext *s,
                                  SingleChannelElement *sce, const float lambda);
    void (*encode_window_bands_info)(struct AACEncContext *s, SingleChannelElement *sce,
                                     int win, int group_len, const float lambda);
    void (*quantize_and_encode_band)(struct AACEncContext *s, PutBitContext *pb, const float *in, float *out, int size,
                                     int scale_idx, int cb, const float lambda, int rtz);
    void (*encode_tns_info)(struct AACEncContext *s, SingleChannelElement *sce);
    void (*encode_ltp_info)(struct AACEncContext *s, SingleChannelElement *sce, int common_window);
    void (*encode_main_pred)(struct AACEncContext *s, SingleChannelElement *sce);
    void (*adjust_common_pred)(struct AACEncContext *s, ChannelElement *cpe);
    void (*adjust_common_ltp)(struct AACEncContext *s, ChannelElement *cpe);
    void (*apply_main_pred)(struct AACEncContext *s, SingleChannelElement *sce);
    void (*apply_tns_filt)(struct AACEncContext *s, SingleChannelElement *sce);
    void (*update_ltp)(struct AACEncContext *s, SingleChannelElement *sce);
    void (*ltp_insert_new_frame)(struct AACEncContext *s);
    void (*set_special_band_scalefactors)(struct AACEncContext *s, SingleChannelElement *sce);
    void (*search_for_pns)(struct AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce);
    void (*mark_pns)(struct AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce);
    void (*search_for_tns)(struct AACEncContext *s, SingleChannelElement *sce);
    void (*search_for_ltp)(struct AACEncContext *s, SingleChannelElement *sce, int common_window);
    void (*search_for_ms)(struct AACEncContext *s, ChannelElement *cpe);
    void (*search_for_is)(struct AACEncContext *s, AVCodecContext *avctx, ChannelElement *cpe);
    void (*search_for_pred)(struct AACEncContext *s, SingleChannelElement *sce);
} AACCoefficientsEncoder;

extern const AACCoefficientsEncoder ff_aac_coders[];

typedef struct AACQuantizeBandCostCacheEntry {
    float rd;
    float energy;
    int bits;
    char cb;
    char rtz;
    uint16_t generation;
} AACQuantizeBandCostCacheEntry;

typedef struct AACPCEInfo {
    int64_t layout;
    int num_ele[4];                              ///< front, side, back, lfe
    int pairing[3][8];                           ///< front, side, back
    int index[4][8];                             ///< front, side, back, lfe
    uint8_t config_map[16];                      ///< configs the encoder's channel specific settings
    uint8_t reorder_map[16];                     ///< maps channels from lavc to aac order
} AACPCEInfo;

/**
 * List of PCE (Program Configuration Element) for the channel layouts listed
 * in channel_layout.h
 *
 * For those wishing in the future to add other layouts:
 *
 * - num_ele: number of elements in each group of front, side, back, lfe channels
 *            (an element is of type SCE (single channel), CPE (channel pair) for
 *            the first 3 groups; and is LFE for LFE group).
 *
 * - pairing: 0 for an SCE element or 1 for a CPE; does not apply to LFE group
 *
 * - index: there are three independent indices for SCE, CPE and LFE;
 *     they are incremented irrespective of the group to which the element belongs;
 *     they are not reset when going from one group to another
 *
 *     Example: for 7.0 channel layout,
 *        .pairing = { { 1, 0 }, { 1 }, { 1 }, }, (3 CPE and 1 SCE in front group)
 *        .index = { { 0, 0 }, { 1 }, { 2 }, },
 *               (index is 0 for the single SCE but goes from 0 to 2 for the CPEs)
 *
 *     The index order impacts the channel ordering. But is otherwise arbitrary
 *     (the sequence could have been 2, 0, 1 instead of 0, 1, 2).
 *
 *     Spec allows for discontinuous indices, e.g. if one has a total of two SCE,
 *     SCE.0 SCE.15 is OK per spec; BUT it won't be decoded by our AAC decoder
 *     which at this time requires that indices fully cover some range starting
 *     from 0 (SCE.1 SCE.0 is OK but not SCE.0 SCE.15).
 *
 * - config_map: total number of elements and their types. Beware, the way the
 *               types are ordered impacts the final channel ordering.
 *
 * - reorder_map: reorders the channels.
 *
 */
static const AACPCEInfo aac_pce_configs[] = {
    {
        .layout = AV_CH_LAYOUT_MONO,
        .num_ele = { 1, 0, 0, 0 },
        .pairing = { { 0 }, },
        .index = { { 0 }, },
        .config_map = { 1, TYPE_SCE, },
        .reorder_map = { 0 },
    },
    {
        .layout = AV_CH_LAYOUT_STEREO,
        .num_ele = { 1, 0, 0, 0 },
        .pairing = { { 1 }, },
        .index = { { 0 }, },
        .config_map = { 1, TYPE_CPE, },
        .reorder_map = { 0, 1 },
    },
    {
        .layout = AV_CH_LAYOUT_2POINT1,
        .num_ele = { 1, 0, 0, 1 },
        .pairing = { { 1 }, },
        .index = { { 0 },{ 0 },{ 0 },{ 0 } },
        .config_map = { 2, TYPE_CPE, TYPE_LFE },
        .reorder_map = { 0, 1, 2 },
    },
    {
        .layout = AV_CH_LAYOUT_2_1,
        .num_ele = { 1, 0, 1, 0 },
        .pairing = { { 1 },{ 0 },{ 0 } },
        .index = { { 0 },{ 0 },{ 0 }, },
        .config_map = { 2, TYPE_CPE, TYPE_SCE },
        .reorder_map = { 0, 1, 2 },
    },
    {
        .layout = AV_CH_LAYOUT_SURROUND,
        .num_ele = { 2, 0, 0, 0 },
        .pairing = { { 1, 0 }, },
        .index = { { 0, 0 }, },
        .config_map = { 2, TYPE_CPE, TYPE_SCE, },
        .reorder_map = { 0, 1, 2 },
    },
    {
        .layout = AV_CH_LAYOUT_3POINT1,
        .num_ele = { 2, 0, 0, 1 },
        .pairing = { { 1, 0 }, },
        .index = { { 0, 0 }, { 0 }, { 0 }, { 0 }, },
        .config_map = { 3, TYPE_CPE, TYPE_SCE, TYPE_LFE },
        .reorder_map = { 0, 1, 2, 3 },
    },
    {
        .layout = AV_CH_LAYOUT_4POINT0,
        .num_ele = { 2, 0, 1, 0 },
        .pairing = { { 1, 0 }, { 0 }, { 0 }, },
        .index = { { 0, 0 }, { 0 }, { 1 } },
        .config_map = { 3, TYPE_CPE, TYPE_SCE, TYPE_SCE },
        .reorder_map = {  0, 1, 2, 3 },
    },
    {
        .layout = AV_CH_LAYOUT_4POINT1,
        .num_ele = { 2, 1, 1, 0 },
        .pairing = { { 1, 0 }, { 0 }, { 0 }, },
        .index = { { 0, 0 }, { 1 }, { 2 }, { 0 } },
        .config_map = { 4, TYPE_CPE, TYPE_SCE, TYPE_SCE, TYPE_SCE },
        .reorder_map = { 0, 1, 2, 3, 4 },
    },
    {
        .layout = AV_CH_LAYOUT_2_2,
        .num_ele = { 1, 1, 0, 0 },
        .pairing = { { 1 }, { 1 }, },
        .index = { { 0 }, { 1 }, },
        .config_map = { 2, TYPE_CPE, TYPE_CPE },
        .reorder_map = { 0, 1, 2, 3 },
    },
    {
        .layout = AV_CH_LAYOUT_QUAD,
        .num_ele = { 1, 0, 1, 0 },
        .pairing = { { 1 }, { 0 }, { 1 }, },
        .index = { { 0 }, { 0 }, { 1 } },
        .config_map = { 2, TYPE_CPE, TYPE_CPE },
        .reorder_map = { 0, 1, 2, 3 },
    },
    {
        .layout = AV_CH_LAYOUT_5POINT0,
        .num_ele = { 2, 1, 0, 0 },
        .pairing = { { 1, 0 }, { 1 }, },
        .index = { { 0, 0 }, { 1 } },
        .config_map = { 3, TYPE_CPE, TYPE_SCE, TYPE_CPE },
        .reorder_map = { 0, 1, 2, 3, 4 },
    },
    {
        .layout = AV_CH_LAYOUT_5POINT1,
        .num_ele = { 2, 1, 1, 0 },
        .pairing = { { 1, 0 }, { 0 }, { 1 }, },
        .index = { { 0, 0 }, { 1 }, { 1 } },
        .config_map = { 4, TYPE_CPE, TYPE_SCE, TYPE_SCE, TYPE_CPE },
        .reorder_map = { 0, 1, 2, 3, 4, 5 },
    },
    {
        .layout = AV_CH_LAYOUT_5POINT0_BACK,
        .num_ele = { 2, 0, 1, 0 },
        .pairing = { { 1, 0 }, { 0 }, { 1 } },
        .index = { { 0, 0 }, { 0 }, { 1 } },
        .config_map = { 3, TYPE_CPE, TYPE_SCE, TYPE_CPE },
        .reorder_map = { 0, 1, 2, 3, 4 },
    },
    {
        .layout = AV_CH_LAYOUT_5POINT1_BACK,
        .num_ele = { 2, 1, 1, 0 },
        .pairing = { { 1, 0 }, { 0 }, { 1 }, },
        .index = { { 0, 0 }, { 1 }, { 1 } },
        .config_map = { 4, TYPE_CPE, TYPE_SCE, TYPE_SCE, TYPE_CPE },
        .reorder_map = { 0, 1, 2, 3, 4, 5 },
    },
    {
        .layout = AV_CH_LAYOUT_6POINT0,
        .num_ele = { 2, 1, 1, 0 },
        .pairing = { { 1, 0 }, { 1 }, { 0 }, },
        .index = { { 0, 0 }, { 1 }, { 1 } },
        .config_map = { 4, TYPE_CPE, TYPE_SCE, TYPE_CPE, TYPE_SCE },
        .reorder_map = { 0, 1, 2, 3, 4, 5 },
    },
    {
        .layout = AV_CH_LAYOUT_6POINT0_FRONT,
        .num_ele = { 2, 1, 0, 0 },
        .pairing = { { 1, 1 }, { 1 } },
        .index = { { 1, 0 }, { 2 }, },
        .config_map = { 3, TYPE_CPE, TYPE_CPE, TYPE_CPE, },
        .reorder_map = { 0, 1, 2, 3, 4, 5 },
    },
    {
        .layout = AV_CH_LAYOUT_HEXAGONAL,
        .num_ele = { 2, 0, 2, 0 },
        .pairing = { { 1, 0 },{ 0 },{ 1, 0 }, },
        .index = { { 0, 0 },{ 0 },{ 1, 1 } },
        .config_map = { 4, TYPE_CPE, TYPE_SCE, TYPE_CPE, TYPE_SCE, },
        .reorder_map = { 0, 1, 2, 3, 4, 5 },
    },
    {
        .layout = AV_CH_LAYOUT_6POINT1,
        .num_ele = { 2, 1, 2, 0 },
        .pairing = { { 1, 0 },{ 0 },{ 1, 0 }, },
        .index = { { 0, 0 },{ 1 },{ 1, 2 } },
        .config_map = { 5, TYPE_CPE, TYPE_SCE, TYPE_SCE, TYPE_CPE, TYPE_SCE },
        .reorder_map = { 0, 1, 2, 3, 4, 5, 6 },
    },
    {
        .layout = AV_CH_LAYOUT_6POINT1_BACK,
        .num_ele = { 2, 1, 2, 0 },
        .pairing = { { 1, 0 }, { 0 }, { 1, 0 }, },
        .index = { { 0, 0 }, { 1 }, { 1, 2 } },
        .config_map = { 5, TYPE_CPE, TYPE_SCE, TYPE_SCE, TYPE_CPE, TYPE_SCE },
        .reorder_map = { 0, 1, 2, 3, 4, 5, 6 },
    },
    {
        .layout = AV_CH_LAYOUT_6POINT1_FRONT,
        .num_ele = { 2, 1, 2, 0 },
        .pairing = { { 1, 0 }, { 0 }, { 1, 0 }, },
        .index = { { 0, 0 }, { 1 }, { 1, 2 } },
        .config_map = { 5, TYPE_CPE, TYPE_SCE, TYPE_SCE, TYPE_CPE, TYPE_SCE },
        .reorder_map = { 0, 1, 2, 3, 4, 5, 6 },
    },
    {
        .layout = AV_CH_LAYOUT_7POINT0,
        .num_ele = { 2, 1, 1, 0 },
        .pairing = { { 1, 0 }, { 1 }, { 1 }, },
        .index = { { 0, 0 }, { 1 }, { 2 }, },
        .config_map = { 4, TYPE_CPE, TYPE_SCE, TYPE_CPE, TYPE_CPE },
        .reorder_map = { 0, 1, 2, 3, 4, 5, 6 },
    },
    {
        .layout = AV_CH_LAYOUT_7POINT0_FRONT,
        .num_ele = { 2, 1, 1, 0 },
        .pairing = { { 1, 0 }, { 1 }, { 1 }, },
        .index = { { 0, 0 }, { 1 }, { 2 }, },
        .config_map = { 4, TYPE_CPE, TYPE_SCE, TYPE_CPE, TYPE_CPE },
        .reorder_map = { 0, 1, 2, 3, 4, 5, 6 },
    },
    {
        .layout = AV_CH_LAYOUT_7POINT1,
        .num_ele = { 2, 1, 2, 0 },
        .pairing = { { 1, 0 }, { 0 }, { 1, 1 }, },
        .index = { { 0, 0 }, { 1 }, { 1, 2 }, { 0 } },
        .config_map = { 5, TYPE_CPE, TYPE_SCE,  TYPE_SCE, TYPE_CPE, TYPE_CPE },
        .reorder_map = { 0, 1, 2, 3, 4, 5, 6, 7 },
    },
    {
        .layout = AV_CH_LAYOUT_7POINT1_WIDE,
        .num_ele = { 2, 1, 2, 0 },
        .pairing = { { 1, 0 }, { 0 },{  1, 1 }, },
        .index = { { 0, 0 }, { 1 }, { 1, 2 }, { 0 } },
        .config_map = { 5, TYPE_CPE, TYPE_SCE, TYPE_SCE, TYPE_CPE, TYPE_CPE },
        .reorder_map = { 0, 1, 2, 3, 4, 5, 6, 7 },
    },
    {
        .layout = AV_CH_LAYOUT_7POINT1_WIDE_BACK,
        .num_ele = { 2, 1, 2, 0 },
        .pairing = { { 1, 0 }, { 0 }, { 1, 1 }, },
        .index = { { 0, 0 }, { 1 }, { 1, 2 }, { 0 } },
        .config_map = { 5, TYPE_CPE, TYPE_SCE, TYPE_SCE, TYPE_CPE, TYPE_CPE },
        .reorder_map = { 0, 1, 2, 3, 4, 5, 6, 7 },
    },
    {
        .layout = AV_CH_LAYOUT_OCTAGONAL,
        .num_ele = { 2, 1, 2, 0 },
        .pairing = { { 1, 0 }, { 1 }, { 1, 0 }, },
        .index = { { 0, 0 }, { 1 }, { 2, 1 } },
        .config_map = { 5, TYPE_CPE, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_SCE },
        .reorder_map = { 0, 1, 2, 3, 4, 5, 6, 7 },
    },
    {   /* Meant for order 2/mixed ambisonics */
        .layout = AV_CH_LAYOUT_OCTAGONAL | AV_CH_TOP_CENTER,
        .num_ele = { 2, 2, 2, 0 },
        .pairing = { { 1, 0 }, { 1, 0 }, { 1, 0 }, },
        .index = { { 0, 0 }, { 1, 1 }, { 2, 2 } },
        .config_map = { 6, TYPE_CPE, TYPE_SCE, TYPE_CPE, TYPE_SCE, TYPE_CPE, TYPE_SCE },
        .reorder_map = { 0, 1, 2, 3, 4, 5, 6, 7, 8 },
    },
    {   /* Meant for order 2/mixed ambisonics */
        .layout = AV_CH_LAYOUT_6POINT0_FRONT | AV_CH_BACK_CENTER |
                  AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT | AV_CH_TOP_CENTER,
        .num_ele = { 2, 2, 2, 0 },
        .pairing = { { 1, 1 }, { 1, 0 }, { 1, 0 }, },
        .index = { { 0, 1 }, { 2, 0 }, { 3, 1 } },
        .config_map = { 6, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_SCE, TYPE_CPE, TYPE_SCE },
        .reorder_map = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
    },
    {
        .layout = AV_CH_LAYOUT_HEXADECAGONAL,
        .num_ele = { 4, 2, 4, 0 },
        .pairing = { { 1, 0, 1, 0 }, { 1, 1 }, { 1, 0, 1, 0 }, },
        .index = { { 0, 0, 1, 1 }, { 2, 3 }, { 4, 2, 5, 3 } },
        .config_map = { 10, TYPE_CPE, TYPE_SCE, TYPE_CPE, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_SCE, TYPE_CPE, TYPE_SCE },
        .reorder_map = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
    },
};

/**
 * AAC encoder context
 */
typedef struct AACEncContext {
    AVClass *av_class;
    AACEncOptions options;                       ///< encoding options
    PutBitContext pb;
    FFTContext mdct1024;                         ///< long (1024 samples) frame transform context
    FFTContext mdct128;                          ///< short (128 samples) frame transform context
    AVFloatDSPContext *fdsp;
    AACPCEInfo pce;                              ///< PCE data, if needed
    float *planar_samples[16];                   ///< saved preprocessed input

    int profile;                                 ///< copied from avctx
    int needs_pce;                               ///< flag for non-standard layout
    LPCContext lpc;                              ///< used by TNS
    int samplerate_index;                        ///< MPEG-4 samplerate index
    int channels;                                ///< channel count
    const uint8_t *reorder_map;                  ///< lavc to aac reorder map
    const uint8_t *chan_map;                     ///< channel configuration map

    ChannelElement *cpe;                         ///< channel elements
    FFPsyContext psy;
    struct FFPsyPreprocessContext* psypp;
    const AACCoefficientsEncoder *coder;
    int cur_channel;                             ///< current channel for coder context
    int random_state;
    float lambda;
    int last_frame_pb_count;                     ///< number of bits for the previous frame
    float lambda_sum;                            ///< sum(lambda), for Qvg reporting
    int lambda_count;                            ///< count(lambda), for Qvg reporting
    enum RawDataBlockType cur_type;              ///< channel group type cur_channel belongs to

    AudioFrameQueue afq;
    DECLARE_ALIGNED(16, int,   qcoefs)[96];      ///< quantized coefficients
    DECLARE_ALIGNED(32, float, scoefs)[1024];    ///< scaled coefficients

    uint16_t quantize_band_cost_cache_generation;
    AACQuantizeBandCostCacheEntry quantize_band_cost_cache[256][128]; ///< memoization area for quantize_band_cost

    void (*abs_pow34)(float *out, const float *in, const int size);
    void (*quant_bands)(int *out, const float *in, const float *scaled,
                        int size, int is_signed, int maxval, const float Q34,
                        const float rounding);

    struct {
        float *samples;
    } buffer;
} AACEncContext;

void ff_aac_dsp_init_x86(AACEncContext *s);
void ff_aac_coder_init_mips(AACEncContext *c);
void ff_quantize_band_cost_cache_init(struct AACEncContext *s);


#endif /* AVCODEC_AACENC_H */