190
 191 typedef struct ALSDecContext {
 192     AVCodecContext *avctx;
 193     ALSSpecificConfig sconf;
 194     GetBitContext gb;
 195     BswapDSPContext bdsp;
 196     const AVCRC *crc_table;
 197     uint32_t crc_org;               ///< CRC value of the original input data
 198     uint32_t crc;                   ///< CRC value calculated from decoded data
 199     unsigned int cur_frame_length;  ///< length of the current frame to decode
 200     unsigned int frame_id;          ///< the frame ID / number of the current frame
 201     unsigned int js_switch;         ///< if true, joint-stereo decoding is enforced
 202     unsigned int cs_switch;         ///< if true, channel rearrangement is done
 203     unsigned int num_blocks;        ///< number of blocks used in the current frame
 204     unsigned int s_max;             ///< maximum Rice parameter allowed in entropy coding
 205     uint8_t *bgmc_lut;              ///< pointer at lookup tables used for BGMC
 206     int *bgmc_lut_status;           ///< pointer at lookup table status flags used for BGMC
 207     int ltp_lag_length;             ///< number of bits used for ltp lag value
 208     int *const_block;               ///< contains const_block flags for all channels
 209     unsigned int *shift_lsbs;       ///< contains shift_lsbs flags for all channels
 210     unsigned int *opt_order;        ///< contains opt_order flags for all channels
 211     int *store_prev_samples;        ///< contains store_prev_samples flags for all channels
 212     int *use_ltp;                   ///< contains use_ltp flags for all channels
 213     int *ltp_lag;                   ///< contains ltp lag values for all channels
 214     int **ltp_gain;                 ///< gain values for ltp 5-tap filter for a channel
 215     int *ltp_gain_buffer;           ///< contains all gain values for ltp 5-tap filter
 216     int32_t **quant_cof;            ///< quantized parcor coefficients for a channel
 217     int32_t *quant_cof_buffer;      ///< contains all quantized parcor coefficients
 218     int32_t **lpc_cof;              ///< coefficients of the direct form prediction filter for a      channel
 219     int32_t *lpc_cof_buffer;        ///< contains all coefficients of the direct form prediction      filter
 220     int32_t *lpc_cof_reversed_buffer; ///< temporary buffer to set up a reversed versio of lpc_co     f_buffer
 221     ALSChannelData **chan_data;     ///< channel data for multi-channel correlation
 222     ALSChannelData *chan_data_buffer; ///< contains channel data for all channels
 223     int *reverted_channels;         ///< stores a flag for each reverted channel
 224     int32_t *prev_raw_samples;      ///< contains unshifted raw samples from the previous block
 225     int32_t **raw_samples;          ///< decoded raw samples for each channel
 226     int32_t *raw_buffer;            ///< contains all decoded raw samples including carryover sam     ples
 227     uint8_t *crc_buffer;            ///< buffer of byte order corrected samples used for CRC chec     k
 228 } ALSDecContext;