FFmpeg
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#include "libavutil/float_dsp.h"
#include "avcodec.h"
#include "fft.h"
#include "get_bits.h"
#include "put_bits.h"
Go to the source code of this file.
Data Structures | |
struct | CoefVLCTable |
struct | WMACodecContext |
Macros | |
#define | BLOCK_MIN_BITS 7 |
#define | BLOCK_MAX_BITS 11 |
#define | BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS) |
#define | BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1) |
#define | HIGH_BAND_MAX_SIZE 16 |
#define | NB_LSP_COEFS 10 |
#define | MAX_CODED_SUPERFRAME_SIZE 32768 |
#define | MAX_CHANNELS 2 |
#define | NOISE_TAB_SIZE 8192 |
#define | LSP_POW_BITS 7 |
#define | VLCBITS 9 |
#define | VLCMAX ((22 + VLCBITS - 1) / VLCBITS) |
Typedefs | |
typedef float | WMACoef |
type for decoded coefficients, int16_t would be enough for wma 1/2 More... | |
Functions | |
int | ff_wma_init (AVCodecContext *avctx, int flags2) |
int | ff_wma_total_gain_to_bits (int total_gain) |
int | ff_wma_end (AVCodecContext *avctx) |
unsigned int | ff_wma_get_large_val (GetBitContext *gb) |
Decode an uncompressed coefficient. More... | |
int | ff_wma_run_level_decode (AVCodecContext *avctx, GetBitContext *gb, VLC *vlc, const float *level_table, const uint16_t *run_table, int version, WMACoef *ptr, int offset, int num_coefs, int block_len, int frame_len_bits, int coef_nb_bits) |
Decode run level compressed coefficients. More... | |
Variables | |
const uint16_t | ff_wma_hgain_huffcodes [37] |
const uint8_t | ff_wma_hgain_huffbits [37] |
const float | ff_wma_lsp_codebook [NB_LSP_COEFS][16] |
const uint32_t | ff_aac_scalefactor_code [121] |
const uint8_t | ff_aac_scalefactor_bits [121] |
#define BLOCK_MIN_BITS 7 |
Definition at line 33 of file wma.h.
Referenced by ff_wma_init().
#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS) |
#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1) |
#define HIGH_BAND_MAX_SIZE 16 |
Definition at line 40 of file wma.h.
Referenced by wma_decode_block().
#define NB_LSP_COEFS 10 |
Definition at line 42 of file wma.h.
Referenced by decode_exp_lsp(), and wma_lsp_to_curve().
#define MAX_CODED_SUPERFRAME_SIZE 32768 |
Definition at line 45 of file wma.h.
Referenced by encode_init(), encode_superframe(), and wma_decode_superframe().
#define NOISE_TAB_SIZE 8192 |
Definition at line 49 of file wma.h.
Referenced by ff_wma_init(), and wma_decode_block().
#define LSP_POW_BITS 7 |
Definition at line 51 of file wma.h.
Referenced by pow_m1_4(), and wma_lsp_to_curve_init().
#define VLCBITS 9 |
Definition at line 54 of file wma.h.
Referenced by ff_wma_run_level_decode(), and init_coef_vlc().
Definition at line 55 of file wma.h.
Referenced by ff_wma_run_level_decode().
typedef float WMACoef |
int ff_wma_init | ( | AVCodecContext * | avctx, |
int | flags2 | ||
) |
Definition at line 81 of file wma.c.
Referenced by encode_init(), and wma_decode_init().
int ff_wma_total_gain_to_bits | ( | int | total_gain | ) |
Definition at line 364 of file wma.c.
Referenced by encode_block(), and wma_decode_block().
int ff_wma_end | ( | AVCodecContext * | avctx | ) |
unsigned int ff_wma_get_large_val | ( | GetBitContext * | gb | ) |
Decode an uncompressed coefficient.
gb | GetBitContext |
consumes up to 34 bits
decode length
Definition at line 406 of file wma.c.
Referenced by decode_coeffs(), and ff_wma_run_level_decode().
int ff_wma_run_level_decode | ( | AVCodecContext * | avctx, |
GetBitContext * | gb, | ||
VLC * | vlc, | ||
const float * | level_table, | ||
const uint16_t * | run_table, | ||
int | version, | ||
WMACoef * | ptr, | ||
int | offset, | ||
int | num_coefs, | ||
int | block_len, | ||
int | frame_len_bits, | ||
int | coef_nb_bits | ||
) |
Decode run level compressed coefficients.
avctx | codec context |
gb | bitstream reader context |
vlc | vlc table for get_vlc2 |
level_table | level codes |
run_table | run codes |
version | 0 for wma1,2 1 for wmapro |
ptr | output buffer |
offset | offset in the output buffer |
num_coefs | number of input coefficents |
block_len | input buffer length (2^n) |
frame_len_bits | number of bits for escaped run codes |
coef_nb_bits | number of bits for escaped level codes |
normal code
EOB
escape
NOTE: this is rather suboptimal. reading block_len_bits would be better
escape decode
NOTE: EOB can be omitted
Definition at line 438 of file wma.c.
Referenced by decode_coeffs(), and wma_decode_block().
const uint16_t ff_wma_hgain_huffcodes[37] |
Definition at line 54 of file wmadata.h.
Referenced by wma_decode_init().
const uint8_t ff_wma_hgain_huffbits[37] |
Definition at line 62 of file wmadata.h.
Referenced by wma_decode_init().
const float ff_wma_lsp_codebook[NB_LSP_COEFS][16] |
Definition at line 68 of file wmadata.h.
Referenced by decode_exp_lsp().
const uint32_t ff_aac_scalefactor_code[121] |
Definition at line 59 of file aactab.c.
Referenced by aac_decode_init(), encode_exp_vlc(), encode_scale_factors(), and wma_decode_init().
const uint8_t ff_aac_scalefactor_bits[121] |
Definition at line 78 of file aactab.c.
Referenced by aac_decode_init(), encode_exp_vlc(), encode_scale_factors(), search_for_quantizers_anmr(), search_for_quantizers_twoloop(), and wma_decode_init().