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/* |
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* TwinVQ decoder |
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* Copyright (c) 2009 Vitor Sessak |
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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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#ifndef AVCODEC_TWINVQ_H |
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#define AVCODEC_TWINVQ_H |
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#include <math.h> |
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#include <stdint.h> |
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#include "libavutil/common.h" |
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#include "libavutil/float_dsp.h" |
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#include "avcodec.h" |
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#include "fft.h" |
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#include "internal.h" |
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enum TwinVQCodec { |
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TWINVQ_CODEC_VQF, |
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TWINVQ_CODEC_METASOUND, |
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}; |
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enum TwinVQFrameType { |
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TWINVQ_FT_SHORT = 0, ///< Short frame (divided in n sub-blocks) |
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TWINVQ_FT_MEDIUM, ///< Medium frame (divided in m<n sub-blocks) |
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TWINVQ_FT_LONG, ///< Long frame (single sub-block + PPC) |
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TWINVQ_FT_PPC, ///< Periodic Peak Component (part of the long frame) |
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}; |
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#define TWINVQ_PPC_SHAPE_CB_SIZE 64 |
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#define TWINVQ_PPC_SHAPE_LEN_MAX 60 |
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#define TWINVQ_SUB_AMP_MAX 4500.0 |
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#define TWINVQ_MULAW_MU 100.0 |
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#define TWINVQ_GAIN_BITS 8 |
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#define TWINVQ_AMP_MAX 13000.0 |
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#define TWINVQ_SUB_GAIN_BITS 5 |
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#define TWINVQ_WINDOW_TYPE_BITS 4 |
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#define TWINVQ_PGAIN_MU 200 |
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#define TWINVQ_LSP_COEFS_MAX 20 |
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#define TWINVQ_LSP_SPLIT_MAX 4 |
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#define TWINVQ_CHANNELS_MAX 2 |
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#define TWINVQ_SUBBLOCKS_MAX 16 |
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#define TWINVQ_BARK_N_COEF_MAX 4 |
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#define TWINVQ_MAX_FRAMES_PER_PACKET 2 |
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/** |
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* Parameters and tables that are different for each frame type |
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*/ |
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struct TwinVQFrameMode { |
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uint8_t sub; ///< Number subblocks in each frame |
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const uint16_t *bark_tab; |
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/** number of distinct bark scale envelope values */ |
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uint8_t bark_env_size; |
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const int16_t *bark_cb; ///< codebook for the bark scale envelope (BSE) |
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uint8_t bark_n_coef;///< number of BSE CB coefficients to read |
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uint8_t bark_n_bit; ///< number of bits of the BSE coefs |
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//@{ |
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/** main codebooks for spectrum data */ |
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const int16_t *cb0; |
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const int16_t *cb1; |
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//@} |
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uint8_t cb_len_read; ///< number of spectrum coefficients to read |
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}; |
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typedef struct TwinVQFrameData { |
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int window_type; |
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enum TwinVQFrameType ftype; |
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uint8_t main_coeffs[1024]; |
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uint8_t ppc_coeffs[TWINVQ_PPC_SHAPE_LEN_MAX]; |
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uint8_t gain_bits[TWINVQ_CHANNELS_MAX]; |
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uint8_t sub_gain_bits[TWINVQ_CHANNELS_MAX * TWINVQ_SUBBLOCKS_MAX]; |
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uint8_t bark1[TWINVQ_CHANNELS_MAX][TWINVQ_SUBBLOCKS_MAX][TWINVQ_BARK_N_COEF_MAX]; |
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uint8_t bark_use_hist[TWINVQ_CHANNELS_MAX][TWINVQ_SUBBLOCKS_MAX]; |
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uint8_t lpc_idx1[TWINVQ_CHANNELS_MAX]; |
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uint8_t lpc_idx2[TWINVQ_CHANNELS_MAX][TWINVQ_LSP_SPLIT_MAX]; |
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uint8_t lpc_hist_idx[TWINVQ_CHANNELS_MAX]; |
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int p_coef[TWINVQ_CHANNELS_MAX]; |
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int g_coef[TWINVQ_CHANNELS_MAX]; |
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} TwinVQFrameData; |
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/** |
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* Parameters and tables that are different for every combination of |
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* bitrate/sample rate |
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*/ |
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typedef struct TwinVQModeTab { |
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struct TwinVQFrameMode fmode[3]; ///< frame type-dependent parameters |
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uint16_t size; ///< frame size in samples |
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uint8_t n_lsp; ///< number of lsp coefficients |
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const float *lspcodebook; |
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/* number of bits of the different LSP CB coefficients */ |
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uint8_t lsp_bit0; |
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uint8_t lsp_bit1; |
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uint8_t lsp_bit2; |
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uint8_t lsp_split; ///< number of CB entries for the LSP decoding |
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const int16_t *ppc_shape_cb; ///< PPC shape CB |
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/** number of the bits for the PPC period value */ |
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uint8_t ppc_period_bit; |
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uint8_t ppc_shape_bit; ///< number of bits of the PPC shape CB coeffs |
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uint8_t ppc_shape_len; ///< size of PPC shape CB |
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uint8_t pgain_bit; ///< bits for PPC gain |
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/** constant for peak period to peak width conversion */ |
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uint16_t peak_per2wid; |
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} TwinVQModeTab; |
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typedef struct TwinVQContext { |
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AVCodecContext *avctx; |
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AVFloatDSPContext *fdsp; |
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FFTContext mdct_ctx[3]; |
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const TwinVQModeTab *mtab; |
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int is_6kbps; |
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// history |
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float lsp_hist[2][20]; ///< LSP coefficients of the last frame |
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float bark_hist[3][2][40]; ///< BSE coefficients of last frame |
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// bitstream parameters |
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int16_t permut[4][4096]; |
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uint8_t length[4][2]; ///< main codebook stride |
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uint8_t length_change[4]; |
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uint8_t bits_main_spec[2][4][2]; ///< bits for the main codebook |
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int bits_main_spec_change[4]; |
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int n_div[4]; |
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float *spectrum; |
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float *curr_frame; ///< non-interleaved output |
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float *prev_frame; ///< non-interleaved previous frame |
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int last_block_pos[2]; |
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int discarded_packets; |
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float *cos_tabs[3]; |
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// scratch buffers |
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float *tmp_buf; |
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int frame_size, frames_per_packet, cur_frame; |
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TwinVQFrameData bits[TWINVQ_MAX_FRAMES_PER_PACKET]; |
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enum TwinVQCodec codec; |
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int (*read_bitstream)(AVCodecContext *avctx, struct TwinVQContext *tctx, |
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const uint8_t *buf, int buf_size); |
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void (*dec_bark_env)(struct TwinVQContext *tctx, const uint8_t *in, |
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int use_hist, int ch, float *out, float gain, |
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enum TwinVQFrameType ftype); |
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void (*decode_ppc)(struct TwinVQContext *tctx, int period_coef, int g_coef, |
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const float *shape, float *speech); |
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} TwinVQContext; |
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extern const enum TwinVQFrameType ff_twinvq_wtype_to_ftype_table[]; |
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/** @note not speed critical, hence not optimized */ |
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static inline void twinvq_memset_float(float *buf, float val, int size) |
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{ |
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✓✓ |
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while (size--) |
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*buf++ = val; |
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} |
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static inline float twinvq_mulawinv(float y, float clip, float mu) |
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{ |
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y = av_clipf(y / clip, -1, 1); |
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✓✗ |
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return clip * FFSIGN(y) * (exp(log(1 + mu) * fabs(y)) - 1) / mu; |
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} |
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int ff_twinvq_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame_ptr, AVPacket *avpkt); |
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int ff_twinvq_decode_close(AVCodecContext *avctx); |
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int ff_twinvq_decode_init(AVCodecContext *avctx); |
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#endif /* AVCODEC_TWINVQ_H */ |