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243 lines
9.8 KiB
243 lines
9.8 KiB
/* |
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* ATRAC3+ compatible decoder |
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* |
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* Copyright (c) 2010-2013 Maxim Poliakovski |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 |
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* Global structures, constants and data for ATRAC3+ decoder. |
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*/ |
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#ifndef AVCODEC_ATRAC3PLUS_H |
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#define AVCODEC_ATRAC3PLUS_H |
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#include <stdint.h> |
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#include "libavutil/float_dsp.h" |
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#include "atrac.h" |
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#include "bitstream.h" |
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#include "avcodec.h" |
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#include "fft.h" |
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/** Global unit sizes */ |
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#define ATRAC3P_SUBBANDS 16 ///< number of PQF subbands |
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#define ATRAC3P_SUBBAND_SAMPLES 128 ///< number of samples per subband |
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#define ATRAC3P_FRAME_SAMPLES (ATRAC3P_SUBBAND_SAMPLES * ATRAC3P_SUBBANDS) |
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#define ATRAC3P_PQF_FIR_LEN 12 ///< length of the prototype FIR of the PQF |
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/** Global constants */ |
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#define ATRAC3P_POWER_COMP_OFF 15 ///< disable power compensation |
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/** ATRAC3+ channel unit types */ |
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enum Atrac3pChannelUnitTypes { |
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CH_UNIT_MONO = 0, ///< unit containing one coded channel |
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CH_UNIT_STEREO = 1, ///< unit containing two jointly-coded channels |
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CH_UNIT_EXTENSION = 2, ///< unit containing extension information |
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CH_UNIT_TERMINATOR = 3 ///< unit sequence terminator |
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}; |
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/** Per-channel IPQF history */ |
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typedef struct Atrac3pIPQFChannelCtx { |
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DECLARE_ALIGNED(32, float, buf1)[ATRAC3P_PQF_FIR_LEN * 2][8]; |
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DECLARE_ALIGNED(32, float, buf2)[ATRAC3P_PQF_FIR_LEN * 2][8]; |
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int pos; |
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} Atrac3pIPQFChannelCtx; |
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/** Amplitude envelope of a group of sine waves */ |
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typedef struct Atrac3pWaveEnvelope { |
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int has_start_point; ///< indicates start point within the GHA window |
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int has_stop_point; ///< indicates stop point within the GHA window |
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int start_pos; ///< start position expressed in n*4 samples |
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int stop_pos; ///< stop position expressed in n*4 samples |
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} Atrac3pWaveEnvelope; |
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/** Parameters of a group of sine waves */ |
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typedef struct Atrac3pWavesData { |
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Atrac3pWaveEnvelope pend_env; ///< pending envelope from the previous frame |
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Atrac3pWaveEnvelope curr_env; ///< group envelope from the current frame |
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int num_wavs; ///< number of sine waves in the group |
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int start_index; ///< start index into global tones table for that subband |
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} Atrac3pWavesData; |
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/** Parameters of a single sine wave */ |
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typedef struct Atrac3pWaveParam { |
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int freq_index; ///< wave frequency index |
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int amp_sf; ///< quantized amplitude scale factor |
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int amp_index; ///< quantized amplitude index |
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int phase_index; ///< quantized phase index |
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} Atrac3pWaveParam; |
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/** Sound channel parameters */ |
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typedef struct Atrac3pChanParams { |
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int ch_num; |
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int num_coded_vals; ///< number of transmitted quant unit values |
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int fill_mode; |
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int split_point; |
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int table_type; ///< table type: 0 - tone?, 1- noise? |
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int qu_wordlen[32]; ///< array of word lengths for each quant unit |
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int qu_sf_idx[32]; ///< array of scale factor indexes for each quant unit |
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int qu_tab_idx[32]; ///< array of code table indexes for each quant unit |
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int16_t spectrum[2048]; ///< decoded IMDCT spectrum |
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uint8_t power_levs[5]; ///< power compensation levels |
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/* imdct window shape history (2 frames) for overlapping. */ |
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uint8_t wnd_shape_hist[2][ATRAC3P_SUBBANDS]; ///< IMDCT window shape, 0=sine/1=steep |
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uint8_t *wnd_shape; ///< IMDCT window shape for current frame |
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uint8_t *wnd_shape_prev; ///< IMDCT window shape for previous frame |
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/* gain control data history (2 frames) for overlapping. */ |
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AtracGainInfo gain_data_hist[2][ATRAC3P_SUBBANDS]; ///< gain control data for all subbands |
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AtracGainInfo *gain_data; ///< gain control data for next frame |
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AtracGainInfo *gain_data_prev; ///< gain control data for previous frame |
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int num_gain_subbands; ///< number of subbands with gain control data |
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/* tones data history (2 frames) for overlapping. */ |
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Atrac3pWavesData tones_info_hist[2][ATRAC3P_SUBBANDS]; |
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Atrac3pWavesData *tones_info; |
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Atrac3pWavesData *tones_info_prev; |
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} Atrac3pChanParams; |
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/* Per-unit sine wave parameters */ |
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typedef struct Atrac3pWaveSynthParams { |
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int tones_present; ///< 1 - tones info present |
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int amplitude_mode; ///< 1 - low range, 0 - high range |
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int num_tone_bands; ///< number of PQF bands with tones |
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uint8_t tone_sharing[ATRAC3P_SUBBANDS]; ///< 1 - subband-wise tone sharing flags |
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uint8_t tone_master[ATRAC3P_SUBBANDS]; ///< 1 - subband-wise tone channel swapping |
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uint8_t phase_shift[ATRAC3P_SUBBANDS]; ///< 1 - subband-wise 180° phase shifting |
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int tones_index; ///< total sum of tones in this unit |
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Atrac3pWaveParam waves[48]; |
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} Atrac3pWaveSynthParams; |
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/** Channel unit parameters */ |
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typedef struct Atrac3pChanUnitCtx { |
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/* channel unit variables */ |
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int unit_type; ///< unit type (mono/stereo) |
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int num_quant_units; |
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int num_subbands; |
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int used_quant_units; ///< number of quant units with coded spectrum |
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int num_coded_subbands; ///< number of subbands with coded spectrum |
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int mute_flag; ///< mute flag |
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int use_full_table; ///< 1 - full table list, 0 - restricted one |
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int noise_present; ///< 1 - global noise info present |
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int noise_level_index; ///< global noise level index |
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int noise_table_index; ///< global noise RNG table index |
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uint8_t swap_channels[ATRAC3P_SUBBANDS]; ///< 1 - perform subband-wise channel swapping |
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uint8_t negate_coeffs[ATRAC3P_SUBBANDS]; ///< 1 - subband-wise IMDCT coefficients negation |
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Atrac3pChanParams channels[2]; |
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/* Variables related to GHA tones */ |
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Atrac3pWaveSynthParams wave_synth_hist[2]; ///< waves synth history for two frames |
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Atrac3pWaveSynthParams *waves_info; |
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Atrac3pWaveSynthParams *waves_info_prev; |
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Atrac3pIPQFChannelCtx ipqf_ctx[2]; |
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DECLARE_ALIGNED(32, float, prev_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< overlapping buffer |
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} Atrac3pChanUnitCtx; |
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/** |
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* Initialize VLC tables for bitstream parsing. |
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* |
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* @param[in] codec ptr to the AVCodec |
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*/ |
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void ff_atrac3p_init_vlcs(AVCodec *codec); |
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/** |
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* Decode bitstream data of a channel unit. |
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* |
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* @param[in] bc the Bitstream context |
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* @param[in,out] ctx ptr to the channel unit context |
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* @param[in] num_channels number of channels to process |
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* @param[in] avctx ptr to the AVCodecContext |
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* @return result code: 0 = OK, otherwise - error code |
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*/ |
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int ff_atrac3p_decode_channel_unit(BitstreamContext *bc, Atrac3pChanUnitCtx *ctx, |
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int num_channels, AVCodecContext *avctx); |
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/** |
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* Initialize IMDCT transform. |
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* |
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* @param[in] avctx ptr to the AVCodecContext |
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* @param[in] mdct_ctx pointer to MDCT transform context |
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*/ |
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void ff_atrac3p_init_imdct(AVCodecContext *avctx, FFTContext *mdct_ctx); |
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/** |
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* Initialize sine waves synthesizer. |
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*/ |
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void ff_atrac3p_init_wave_synth(void); |
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/** |
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* Synthesize sine waves for a particular subband. |
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* |
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* @param[in] ch_unit pointer to the channel unit context |
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* @param[in] fdsp pointer to float DSP context |
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* @param[in] ch_num which channel to process |
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* @param[in] sb which subband to process |
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* @param[out] out receives processed data |
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*/ |
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void ff_atrac3p_generate_tones(Atrac3pChanUnitCtx *ch_unit, AVFloatDSPContext *fdsp, |
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int ch_num, int sb, float *out); |
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/** |
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* Perform power compensation aka noise dithering. |
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* |
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* @param[in] ctx ptr to the channel context |
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* @param[in] ch_index which channel to process |
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* @param[in,out] sp ptr to channel spectrum to process |
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* @param[in] rng_index indicates which RNG table to use |
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* @param[in] sb_num which subband to process |
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*/ |
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void ff_atrac3p_power_compensation(Atrac3pChanUnitCtx *ctx, int ch_index, |
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float *sp, int rng_index, int sb_num); |
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/** |
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* Regular IMDCT and windowing without overlapping, |
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* with spectrum reversal in the odd subbands. |
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* |
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* @param[in] fdsp pointer to float DSP context |
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* @param[in] mdct_ctx pointer to MDCT transform context |
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* @param[in] pIn float input |
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* @param[out] pOut float output |
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* @param[in] wind_id which MDCT window to apply |
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* @param[in] sb subband number |
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*/ |
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void ff_atrac3p_imdct(AVFloatDSPContext *fdsp, FFTContext *mdct_ctx, float *pIn, |
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float *pOut, int wind_id, int sb); |
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/** |
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* Subband synthesis filter based on the polyphase quadrature (pseudo-QMF) |
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* filter bank. |
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* |
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* @param[in] dct_ctx ptr to the pre-initialized IDCT context |
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* @param[in,out] hist ptr to the filter history |
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* @param[in] in input data to process |
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* @param[out] out receives processed data |
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*/ |
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void ff_atrac3p_ipqf(FFTContext *dct_ctx, Atrac3pIPQFChannelCtx *hist, |
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const float *in, float *out); |
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extern const uint16_t ff_atrac3p_qu_to_spec_pos[33]; |
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extern const float ff_atrac3p_sf_tab[64]; |
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extern const float ff_atrac3p_mant_tab[8]; |
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#endif /* AVCODEC_ATRAC3PLUS_H */
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