#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
#include "fft.h"
#include "lsp.h"
#include "sinewin.h"
#include <math.h>
#include <stdint.h>
#include "twinvq_data.h"
Go to the source code of this file.
Data Structures | |
struct | FrameMode |
Parameters and tables that are different for each frame type. More... | |
struct | ModeTab |
Parameters and tables that are different for every combination of bitrate/sample rate. More... | |
struct | TwinContext |
Macros | |
#define | PPC_SHAPE_CB_SIZE 64 |
#define | PPC_SHAPE_LEN_MAX 60 |
#define | SUB_AMP_MAX 4500.0 |
#define | MULAW_MU 100.0 |
#define | GAIN_BITS 8 |
#define | AMP_MAX 13000.0 |
#define | SUB_GAIN_BITS 5 |
#define | WINDOW_TYPE_BITS 4 |
#define | PGAIN_MU 200 |
#define | LSP_COEFS_MAX 20 |
#define | LSP_SPLIT_MAX 4 |
#define | CHANNELS_MAX 2 |
#define | SUBBLOCKS_MAX 16 |
#define | BARK_N_COEF_MAX 4 |
Typedefs | |
typedef struct TwinContext | TwinContext |
Enumerations | |
enum | FrameType { FT_SHORT = 0, FT_MEDIUM, FT_LONG, FT_PPC } |
Functions | |
static void | memset_float (float *buf, float val, int size) |
static float | eval_lpc_spectrum (const float *lsp, float cos_val, int order) |
Evaluate a single LPC amplitude spectrum envelope coefficient from the line spectrum pairs. More... | |
static void | eval_lpcenv (TwinContext *tctx, const float *cos_vals, float *lpc) |
Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs. More... | |
static void | interpolate (float *out, float v1, float v2, int size) |
static float | get_cos (int idx, int part, const float *cos_tab, int size) |
static void | eval_lpcenv_or_interp (TwinContext *tctx, enum FrameType ftype, float *out, const float *in, int size, int step, int part) |
Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs. More... | |
static void | eval_lpcenv_2parts (TwinContext *tctx, enum FrameType ftype, const float *buf, float *lpc, int size, int step) |
static void | dequant (TwinContext *tctx, GetBitContext *gb, float *out, enum FrameType ftype, const int16_t *cb0, const int16_t *cb1, int cb_len) |
Inverse quantization. More... | |
static float | mulawinv (float y, float clip, float mu) |
static int | very_broken_op (int a, int b) |
Evaluate a*b/400 rounded to the nearest integer. More... | |
static void | add_peak (int period, int width, const float *shape, float ppc_gain, float *speech, int len) |
Sum to data a periodic peak of a given period, width and shape. More... | |
static void | decode_ppc (TwinContext *tctx, int period_coef, const float *shape, float ppc_gain, float *speech) |
static void | dec_gain (TwinContext *tctx, GetBitContext *gb, enum FrameType ftype, float *out) |
static void | rearrange_lsp (int order, float *lsp, float min_dist) |
Rearrange the LSP coefficients so that they have a minimum distance of min_dist. More... | |
static void | decode_lsp (TwinContext *tctx, int lpc_idx1, uint8_t *lpc_idx2, int lpc_hist_idx, float *lsp, float *hist) |
static void | dec_lpc_spectrum_inv (TwinContext *tctx, float *lsp, enum FrameType ftype, float *lpc) |
static void | imdct_and_window (TwinContext *tctx, enum FrameType ftype, int wtype, float *in, float *prev, int ch) |
static void | imdct_output (TwinContext *tctx, enum FrameType ftype, int wtype, float *out) |
static void | dec_bark_env (TwinContext *tctx, const uint8_t *in, int use_hist, int ch, float *out, float gain, enum FrameType ftype) |
static void | read_and_decode_spectrum (TwinContext *tctx, GetBitContext *gb, float *out, enum FrameType ftype) |
static int | twin_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt) |
static av_cold int | init_mdct_win (TwinContext *tctx) |
Init IMDCT and windowing tables. More... | |
static void | permutate_in_line (int16_t *tab, int num_vect, int num_blocks, int block_size, const uint8_t line_len[2], int length_div, enum FrameType ftype) |
Interpret the data as if it were a num_blocks x line_len[0] matrix and for each line do a cyclic permutation, i.e. More... | |
static void | transpose_perm (int16_t *out, int16_t *in, int num_vect, const uint8_t line_len[2], int length_div) |
Interpret the input data as in the following table: More... | |
static void | linear_perm (int16_t *out, int16_t *in, int n_blocks, int size) |
static av_cold void | construct_perm_table (TwinContext *tctx, enum FrameType ftype) |
static av_cold void | init_bitstream_params (TwinContext *tctx) |
static av_cold int | twin_decode_close (AVCodecContext *avctx) |
static av_cold int | twin_decode_init (AVCodecContext *avctx) |
Variables | |
static const ModeTab | mode_08_08 |
static const ModeTab | mode_11_08 |
static const ModeTab | mode_11_10 |
static const ModeTab | mode_16_16 |
static const ModeTab | mode_22_20 |
static const ModeTab | mode_22_24 |
static const ModeTab | mode_22_32 |
static const ModeTab | mode_44_40 |
static const ModeTab | mode_44_48 |
AVCodec | ff_twinvq_decoder |
#define AMP_MAX 13000.0 |
Definition at line 212 of file twinvq.c.
Referenced by dec_gain().
#define BARK_N_COEF_MAX 4 |
Definition at line 220 of file twinvq.c.
Referenced by read_and_decode_spectrum().
#define CHANNELS_MAX 2 |
Definition at line 218 of file twinvq.c.
Referenced by read_and_decode_spectrum(), and twin_decode_init().
#define GAIN_BITS 8 |
Definition at line 211 of file twinvq.c.
Referenced by dec_gain(), and init_bitstream_params().
#define LSP_COEFS_MAX 20 |
Definition at line 216 of file twinvq.c.
Referenced by read_and_decode_spectrum().
#define LSP_SPLIT_MAX 4 |
Definition at line 217 of file twinvq.c.
Referenced by read_and_decode_spectrum().
#define MULAW_MU 100.0 |
Definition at line 210 of file twinvq.c.
Referenced by dec_gain().
#define PGAIN_MU 200 |
Definition at line 215 of file twinvq.c.
Referenced by read_and_decode_spectrum().
#define PPC_SHAPE_CB_SIZE 64 |
Definition at line 207 of file twinvq.c.
Referenced by read_and_decode_spectrum().
#define PPC_SHAPE_LEN_MAX 60 |
Definition at line 208 of file twinvq.c.
Referenced by read_and_decode_spectrum().
#define SUB_AMP_MAX 4500.0 |
Definition at line 209 of file twinvq.c.
Referenced by dec_gain().
#define SUB_GAIN_BITS 5 |
Definition at line 213 of file twinvq.c.
Referenced by dec_gain(), and init_bitstream_params().
#define SUBBLOCKS_MAX 16 |
Definition at line 219 of file twinvq.c.
Referenced by read_and_decode_spectrum().
#define WINDOW_TYPE_BITS 4 |
Definition at line 214 of file twinvq.c.
Referenced by init_bitstream_params(), and twin_decode_frame().
typedef struct TwinContext TwinContext |
enum FrameType |
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Sum to data a periodic peak of a given period, width and shape.
period | the period of the peak divised by 400.0 |
Definition at line 452 of file twinvq.c.
Referenced by decode_ppc().
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Definition at line 999 of file twinvq.c.
Referenced by init_bitstream_params().
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Definition at line 706 of file twinvq.c.
Referenced by read_and_decode_spectrum().
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Definition at line 501 of file twinvq.c.
Referenced by read_and_decode_spectrum().
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Definition at line 589 of file twinvq.c.
Referenced by read_and_decode_spectrum().
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Definition at line 550 of file twinvq.c.
Referenced by read_and_decode_spectrum().
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Definition at line 476 of file twinvq.c.
Referenced by read_and_decode_spectrum().
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Inverse quantization.
Read CB coefficients for cb1 and cb2 from the bitstream, sum the corresponding vectors and write the result to *out after permutation.
Definition at line 361 of file twinvq.c.
Referenced by read_and_decode_spectrum().
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Evaluate a single LPC amplitude spectrum envelope coefficient from the line spectrum pairs.
lsp | a vector of the cosinus of the LSP values |
cos_val | cos(PI*i/N) where i is the index of the LPC amplitude |
order | the order of the LSP (and the size of the *lsp buffer). Must be a multiple of four. |
Definition at line 241 of file twinvq.c.
Referenced by eval_lpcenv(), and eval_lpcenv_or_interp().
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Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs.
Definition at line 266 of file twinvq.c.
Referenced by dec_lpc_spectrum_inv().
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Definition at line 344 of file twinvq.c.
Referenced by dec_lpc_spectrum_inv().
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inlinestatic |
Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs.
Probably for speed reasons, the coefficients are evaluated as siiiibiiiisiiiibiiiisiiiibiiiisiiiibiiiis ... where s is an evaluated value, i is a value interpolated from the others and b might be either calculated or interpolated, depending on an unexplained condition.
step | the size of a block "siiiibiiii" |
in | the cosinus of the LSP data |
part | is 0 for 0...PI (positive cossinus values) and 1 for PI...2PI (negative cossinus values) |
size | the size of the whole output |
Definition at line 310 of file twinvq.c.
Referenced by eval_lpcenv_2parts().
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inlinestatic |
Definition at line 290 of file twinvq.c.
Referenced by eval_lpcenv_or_interp().
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Definition at line 611 of file twinvq.c.
Referenced by imdct_output().
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Definition at line 666 of file twinvq.c.
Referenced by twin_decode_frame().
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Definition at line 1023 of file twinvq.c.
Referenced by twin_decode_init().
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Init IMDCT and windowing tables.
Definition at line 882 of file twinvq.c.
Referenced by twin_decode_init().
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Definition at line 279 of file twinvq.c.
Referenced by eval_lpcenv_2parts(), and eval_lpcenv_or_interp().
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Definition at line 990 of file twinvq.c.
Referenced by construct_perm_table().
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Definition at line 223 of file twinvq.c.
Referenced by dec_bark_env(), eval_lpcenv_2parts(), and twin_decode_init().
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inlinestatic |
Definition at line 405 of file twinvq.c.
Referenced by dec_gain(), and read_and_decode_spectrum().
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Interpret the data as if it were a num_blocks x line_len[0] matrix and for each line do a cyclic permutation, i.e.
abcdefghijklm -> defghijklmabc where the amount to be shifted is evaluated depending on the column.
Definition at line 939 of file twinvq.c.
Referenced by construct_perm_table().
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Definition at line 733 of file twinvq.c.
Referenced by twin_decode_frame().
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Rearrange the LSP coefficients so that they have a minimum distance of min_dist.
This function does it exactly as described in section of 3.2.4 of the G.729 specification (but interestingly is different from what the reference decoder actually does).
Definition at line 537 of file twinvq.c.
Referenced by decode_lsp().
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Interpret the input data as in the following table:
* * abcdefgh * ijklmnop * qrstuvw * x123456 * *
and transpose it, giving the output aiqxbjr1cks2dlt3emu4fvn5gow6hp
Definition at line 980 of file twinvq.c.
Referenced by construct_perm_table().
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Definition at line 1092 of file twinvq.c.
Referenced by twin_decode_init().
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Evaluate a*b/400 rounded to the nearest integer.
When, for example, a*b == 200 and the nearest integer is ill-defined, use a table to emulate the following broken float-based implementation used by the binary decoder:
Definition at line 431 of file twinvq.c.
Referenced by add_peak().
AVCodec ff_twinvq_decoder |
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