137 typedef struct TwinVQContext {  struct
138     AVCodecContext *avctx;
139     AVFloatDSPContext *fdsp;
140     FFTContext mdct_ctx[3];
142     const TwinVQModeTab *mtab;
144     int is_6kbps;
147     float lsp_hist[2][20];           ///< LSP coefficients of the last frame
148     float bark_hist[3][2][40];       ///< BSE coefficients of last frame
174     int (*read_bitstream)(AVCodecContext *avctx, struct TwinVQContext *tctx,  argument
176     void (*dec_bark_env)(struct TwinVQContext *tctx, const uint8_t *in,  argument
179     void (*decode_ppc)(struct TwinVQContext *tctx, int period_coef, int g_coef,  argument
181 } TwinVQContext;  typedef