22 #ifndef AVCODEC_RA144_H 23 #define AVCODEC_RA144_H 35 #define BUFFERSIZE 146
36 #define FIXED_CB_SIZE 128
77 unsigned int ff_rescale_rms(
unsigned int rms,
unsigned int energy);
80 int cba_idx,
int cb1_idx,
int cb2_idx,
unsigned int lpc_tables[2][10]
unsigned int ff_rms(const int *data)
ptrdiff_t const GLvoid * data
const uint16_t ff_cb1_base[128]
int16_t adapt_cb[146+2]
Adaptive codebook, its size is two units bigger to avoid a buffer overflow.
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
void ff_subblock_synthesis(RA144Context *ractx, const int16_t *lpc_coefs, int cba_idx, int cb1_idx, int cb2_idx, int gval, int gain)
int ff_irms(AudioDSPContext *adsp, const int16_t *data)
inverse root mean square
#define NBLOCKS
number of subblocks within a block
const int16_t ff_energy_tab[32]
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
unsigned int lpc_refl_rms[2]
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
int ff_eval_refl(int *refl, const int16_t *coefs, AVCodecContext *avctx)
Evaluate the reflection coefficients from the filter coefficients.
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a source
void ff_int_to_int16(int16_t *out, const int *inp)
int ff_interp(RA144Context *ractx, int16_t *out, int a, int copyold, int energy)
unsigned int * lpc_coef[2]
LPC coefficients: lpc_coef[0] is the coefficients of the current frame and lpc_coef[1] of the previou...
const int8_t ff_cb2_vects[128][40]
unsigned int ff_rescale_rms(unsigned int rms, unsigned int energy)
#define BLOCKSIZE
subblock size in 16-bit words
const int8_t ff_cb1_vects[128][40]
const int16_t ff_gain_val_tab[256][3]
main external API structure.
void ff_eval_coefs(int *coefs, const int *refl)
Evaluate the LPC filter coefficients from the reflection coefficients.
void ff_copy_and_dup(int16_t *target, const int16_t *source, int offset)
Copy the last offset values of *source to *target.
const uint16_t ff_cb2_base[128]
int16_t buffer_a[FFALIGN(BLOCKSIZE, 16)]
unsigned int old_energy
previous frame energy
int16_t curr_sblock[50]
The current subblock padded by the last 10 values of the previous one.
int ff_t_sqrt(unsigned int x)
Evaluate sqrt(x << 24).
int16_t curr_block[NBLOCKS *BLOCKSIZE]
const uint8_t ff_gain_exp_tab[256]
const int16_t *const ff_lpc_refl_cb[10]