* Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
* Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file aac.h
+ * @file
* AAC definitions and structures
* @author Oded Shimon ( ods15 ods15 dyndns org )
* @author Maxim Gavrilov ( maxim.gavrilov gmail com )
*/
-#ifndef FFMPEG_AAC_H
-#define FFMPEG_AAC_H
+#ifndef AVCODEC_AAC_H
+#define AVCODEC_AAC_H
+#include "libavutil/float_dsp.h"
#include "avcodec.h"
-#include "dsputil.h"
+#include "imdct15.h"
+#include "fft.h"
#include "mpeg4audio.h"
+#include "sbr.h"
#include <stdint.h>
-#define AAC_INIT_VLC_STATIC(num, size) \
- INIT_VLC_STATIC(&vlc_spectral[num], 6, ff_aac_spectral_sizes[num], \
- ff_aac_spectral_bits[num], sizeof( ff_aac_spectral_bits[num][0]), sizeof( ff_aac_spectral_bits[num][0]), \
- ff_aac_spectral_codes[num], sizeof(ff_aac_spectral_codes[num][0]), sizeof(ff_aac_spectral_codes[num][0]), \
- size);
+#define MAX_CHANNELS 64
+#define MAX_ELEM_ID 16
-#define IVQUANT_SIZE 1024
+#define TNS_MAX_ORDER 20
+#define MAX_LTP_LONG_SFB 40
+
+enum RawDataBlockType {
+ TYPE_SCE,
+ TYPE_CPE,
+ TYPE_CCE,
+ TYPE_LFE,
+ TYPE_DSE,
+ TYPE_PCE,
+ TYPE_FIL,
+ TYPE_END,
+};
+
+enum ExtensionPayloadID {
+ EXT_FILL,
+ EXT_FILL_DATA,
+ EXT_DATA_ELEMENT,
+ EXT_DYNAMIC_RANGE = 0xb,
+ EXT_SBR_DATA = 0xd,
+ EXT_SBR_DATA_CRC = 0xe,
+};
enum WindowSequence {
ONLY_LONG_SEQUENCE,
LONG_STOP_SEQUENCE,
};
-enum ChannelType {
+enum BandType {
+ ZERO_BT = 0, ///< Scalefactors and spectral data are all zero.
+ FIRST_PAIR_BT = 5, ///< This and later band types encode two values (rather than four) with one code word.
+ ESC_BT = 11, ///< Spectral data are coded with an escape sequence.
+ NOISE_BT = 13, ///< Spectral data are scaled white noise not coded in the bitstream.
+ INTENSITY_BT2 = 14, ///< Scalefactor data are intensity stereo positions.
+ INTENSITY_BT = 15, ///< Scalefactor data are intensity stereo positions.
+};
+
+#define IS_CODEBOOK_UNSIGNED(x) ((x - 1) & 10)
+
+enum ChannelPosition {
+ AAC_CHANNEL_OFF = 0,
AAC_CHANNEL_FRONT = 1,
AAC_CHANNEL_SIDE = 2,
AAC_CHANNEL_BACK = 3,
AAC_CHANNEL_CC = 5,
};
+/**
+ * The point during decoding at which channel coupling is applied.
+ */
+enum CouplingPoint {
+ BEFORE_TNS,
+ BETWEEN_TNS_AND_IMDCT,
+ AFTER_IMDCT = 3,
+};
+
+/**
+ * Output configuration status
+ */
+enum OCStatus {
+ OC_NONE, ///< Output unconfigured
+ OC_TRIAL_PCE, ///< Output configuration under trial specified by an inband PCE
+ OC_TRIAL_FRAME, ///< Output configuration under trial specified by a frame header
+ OC_GLOBAL_HDR, ///< Output configuration set in a global header but not yet locked
+ OC_LOCKED, ///< Output configuration locked in place
+};
+
+typedef struct OutputConfiguration {
+ MPEG4AudioConfig m4ac;
+ uint8_t layout_map[MAX_ELEM_ID*4][3];
+ int layout_map_tags;
+ int channels;
+ uint64_t channel_layout;
+ enum OCStatus status;
+} OutputConfiguration;
+
+/**
+ * Predictor State
+ */
+typedef struct PredictorState {
+ float cor0;
+ float cor1;
+ float var0;
+ float var1;
+ float r0;
+ float r1;
+} PredictorState;
+
+#define MAX_PREDICTORS 672
+
+#define SCALE_DIV_512 36 ///< scalefactor difference that corresponds to scale difference in 512 times
+#define SCALE_ONE_POS 140 ///< scalefactor index that corresponds to scale=1.0
+#define SCALE_MAX_POS 255 ///< scalefactor index maximum value
+#define SCALE_MAX_DIFF 60 ///< maximum scalefactor difference allowed by standard
+#define SCALE_DIFF_ZERO 60 ///< codebook index corresponding to zero scalefactor indices difference
+
+/**
+ * Long Term Prediction
+ */
+typedef struct LongTermPrediction {
+ int8_t present;
+ int16_t lag;
+ float coef;
+ int8_t used[MAX_LTP_LONG_SFB];
+} LongTermPrediction;
+
+/**
+ * Individual Channel Stream
+ */
+typedef struct IndividualChannelStream {
+ uint8_t max_sfb; ///< number of scalefactor bands per group
+ enum WindowSequence window_sequence[2];
+ uint8_t use_kb_window[2]; ///< If set, use Kaiser-Bessel window, otherwise use a sine window.
+ int num_window_groups;
+ uint8_t group_len[8];
+ LongTermPrediction ltp;
+ const uint16_t *swb_offset; ///< table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular window
+ const uint8_t *swb_sizes; ///< table of scalefactor band sizes for a particular window
+ int num_swb; ///< number of scalefactor window bands
+ int num_windows;
+ int tns_max_bands;
+ int predictor_present;
+ int predictor_initialized;
+ int predictor_reset_group;
+ uint8_t prediction_used[41];
+} IndividualChannelStream;
+
+/**
+ * Temporal Noise Shaping
+ */
+typedef struct TemporalNoiseShaping {
+ int present;
+ int n_filt[8];
+ int length[8][4];
+ int direction[8][4];
+ int order[8][4];
+ float coef[8][4][TNS_MAX_ORDER];
+} TemporalNoiseShaping;
+
+/**
+ * Dynamic Range Control - decoded from the bitstream but not processed further.
+ */
+typedef struct DynamicRangeControl {
+ int pce_instance_tag; ///< Indicates with which program the DRC info is associated.
+ int dyn_rng_sgn[17]; ///< DRC sign information; 0 - positive, 1 - negative
+ int dyn_rng_ctl[17]; ///< DRC magnitude information
+ int exclude_mask[MAX_CHANNELS]; ///< Channels to be excluded from DRC processing.
+ int band_incr; ///< Number of DRC bands greater than 1 having DRC info.
+ int interpolation_scheme; ///< Indicates the interpolation scheme used in the SBR QMF domain.
+ int band_top[17]; ///< Indicates the top of the i-th DRC band in units of 4 spectral lines.
+ int prog_ref_level; /**< A reference level for the long-term program audio level for all
+ * channels combined.
+ */
+} DynamicRangeControl;
+
+typedef struct Pulse {
+ int num_pulse;
+ int start;
+ int pos[4];
+ int amp[4];
+} Pulse;
+
+/**
+ * coupling parameters
+ */
+typedef struct ChannelCoupling {
+ enum CouplingPoint coupling_point; ///< The point during decoding at which coupling is applied.
+ int num_coupled; ///< number of target elements
+ enum RawDataBlockType type[8]; ///< Type of channel element to be coupled - SCE or CPE.
+ int id_select[8]; ///< element id
+ int ch_select[8]; /**< [0] shared list of gains; [1] list of gains for right channel;
+ * [2] list of gains for left channel; [3] lists of gains for both channels
+ */
+ float gain[16][120];
+} ChannelCoupling;
+
+/**
+ * Single Channel Element - used for both SCE and LFE elements.
+ */
+typedef struct SingleChannelElement {
+ IndividualChannelStream ics;
+ TemporalNoiseShaping tns;
+ Pulse pulse;
+ enum BandType band_type[128]; ///< band types
+ int band_type_run_end[120]; ///< band type run end points
+ float sf[120]; ///< scalefactors
+ int sf_idx[128]; ///< scalefactor indices (used by encoder)
+ uint8_t zeroes[128]; ///< band is not coded (used by encoder)
+ DECLARE_ALIGNED(32, float, coeffs)[1024]; ///< coefficients for IMDCT
+ DECLARE_ALIGNED(32, float, saved)[1536]; ///< overlap
+ DECLARE_ALIGNED(32, float, ret_buf)[2048]; ///< PCM output buffer
+ DECLARE_ALIGNED(16, float, ltp_state)[3072]; ///< time signal for LTP
+ PredictorState predictor_state[MAX_PREDICTORS];
+ float *ret; ///< PCM output
+} SingleChannelElement;
+
+/**
+ * channel element - generic struct for SCE/CPE/CCE/LFE
+ */
+typedef struct ChannelElement {
+ // CPE specific
+ int common_window; ///< Set if channels share a common 'IndividualChannelStream' in bitstream.
+ int ms_mode; ///< Signals mid/side stereo flags coding mode (used by encoder)
+ uint8_t ms_mask[128]; ///< Set if mid/side stereo is used for each scalefactor window band
+ // shared
+ SingleChannelElement ch[2];
+ // CCE specific
+ ChannelCoupling coup;
+ SpectralBandReplication sbr;
+} ChannelElement;
+
/**
* main AAC context
*/
-typedef struct {
- AVCodecContext * avccontext;
+typedef struct AACContext {
+ AVCodecContext *avctx;
+ AVFrame *frame;
+
+ int is_saved; ///< Set if elements have stored overlap from previous frame.
+ DynamicRangeControl che_drc;
+
+ /**
+ * @name Channel element related data
+ * @{
+ */
+ ChannelElement *che[4][MAX_ELEM_ID];
+ ChannelElement *tag_che_map[4][MAX_ELEM_ID];
+ int tags_mapped;
+ /** @} */
/**
- * @defgroup tables Computed / set up during initialization.
+ * @name temporary aligned temporary buffers
+ * (We do not want to have these on the stack.)
* @{
*/
- MDCTContext mdct;
- MDCTContext mdct_small;
- DSPContext dsp;
+ DECLARE_ALIGNED(32, float, buf_mdct)[1024];
/** @} */
/**
- * @defgroup output Members used for output interleaving and down-mixing.
+ * @name Computed / set up during initialization
* @{
*/
- float add_bias; ///< offset for dsp.float_to_int16
- float sf_scale; ///< Pre-scale for correct IMDCT and dsp.float_to_int16.
- int sf_offset; ///< offset into pow2sf_tab as appropriate for dsp.float_to_int16
+ FFTContext mdct;
+ FFTContext mdct_small;
+ FFTContext mdct_ld;
+ FFTContext mdct_ltp;
+ IMDCT15Context *mdct480;
+ AVFloatDSPContext fdsp;
+ int random_state;
/** @} */
+ /**
+ * @name Members used for output
+ * @{
+ */
+ SingleChannelElement *output_element[MAX_CHANNELS]; ///< Points to each SingleChannelElement
+ /** @} */
+
+ DECLARE_ALIGNED(32, float, temp)[128];
+
+ OutputConfiguration oc[2];
} AACContext;
-#endif /* FFMPEG_AAC_H */
+#endif /* AVCODEC_AAC_H */
projects / ffmpeg / blobdiff