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