hvirtual/quicktime/ffmpeg/libavcodec/ac3enc.c File Reference

#include "avcodec.h"
#include "bitstream.h"
#include "ac3.h"
#include "ac3tab.h"

Include dependency graph for ac3enc.c:

Go to the source code of this file.

Data Structures

struct  AC3EncodeContext
struct  IComplex

Defines

#define MDCT_NBITS   9
#define N   (1 << MDCT_NBITS)
#define EXP_DIFF_THRESHOLD   1000
#define BF(pre, pim, qre, qim, pre1, pim1, qre1, qim1)
#define MUL16(a, b)   ((a) * (b))
#define CMUL(pre, pim, are, aim, bre, bim)
#define SNR_INC1   4
#define CRC16_POLY   ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16))

Functions

static void fft_init (int ln)
static void ac3_crc_init (void)
static int16_t fix15 (float a)
static int calc_lowcomp1 (int a, int b0, int b1)
static int calc_lowcomp (int a, int b0, int b1, int bin)
void ac3_parametric_bit_allocation (AC3BitAllocParameters *s, uint8_t *bap, int8_t *exp, int start, int end, int snroffset, int fgain, int is_lfe, int deltbae, int deltnseg, uint8_t *deltoffst, uint8_t *deltlen, uint8_t *deltba)
static void fft (IComplex *z, int ln)
static void mdct512 (int32_t *out, int16_t *in)
static int calc_exp_diff (uint8_t *exp1, uint8_t *exp2, int n)
static void compute_exp_strategy (uint8_t exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS], uint8_t exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2], int ch, int is_lfe)
static void exponent_min (uint8_t exp[N/2], uint8_t exp1[N/2], int n)
static int encode_exp (uint8_t encoded_exp[N/2], uint8_t exp[N/2], int nb_exps, int exp_strategy)
static int compute_mantissa_size (AC3EncodeContext *s, uint8_t *m, int nb_coefs)
static int bit_alloc (AC3EncodeContext *s, uint8_t bap[NB_BLOCKS][AC3_MAX_CHANNELS][N/2], uint8_t encoded_exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2], uint8_t exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS], int frame_bits, int csnroffst, int fsnroffst)
static int compute_bit_allocation (AC3EncodeContext *s, uint8_t bap[NB_BLOCKS][AC3_MAX_CHANNELS][N/2], uint8_t encoded_exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2], uint8_t exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS], int frame_bits)
void ac3_common_init (void)
static int AC3_encode_init (AVCodecContext *avctx)
static void output_frame_header (AC3EncodeContext *s, unsigned char *frame)
static int sym_quant (int c, int e, int levels)
static int asym_quant (int c, int e, int qbits)
static void output_audio_block (AC3EncodeContext *s, uint8_t exp_strategy[AC3_MAX_CHANNELS], uint8_t encoded_exp[AC3_MAX_CHANNELS][N/2], uint8_t bap[AC3_MAX_CHANNELS][N/2], int32_t mdct_coefs[AC3_MAX_CHANNELS][N/2], int8_t global_exp[AC3_MAX_CHANNELS], int block_num)
static unsigned int ac3_crc (uint8_t *data, int n, unsigned int crc)
static unsigned int mul_poly (unsigned int a, unsigned int b, unsigned int poly)
static unsigned int pow_poly (unsigned int a, unsigned int n, unsigned int poly)
static int log2_tab (int16_t *tab, int n)
static void lshift_tab (int16_t *tab, int n, int lshift)
static int output_frame_end (AC3EncodeContext *s)
static int AC3_encode_frame (AVCodecContext *avctx, unsigned char *frame, int buf_size, void *data)
static int AC3_encode_close (AVCodecContext *avctx)

Variables

AVCodec ac3_encoder

Detailed Description

The simplest AC3 encoder.

Definition in file ac3enc.c.

Define Documentation

#define BF ( pre,
pim,
qre,
qim,
pre1,
pim1,
qre1,
qim1   ) 

Value:

{\
  int ax, ay, bx, by;\
  bx=pre1;\
  by=pim1;\
  ax=qre1;\
  ay=qim1;\
  pre = (bx + ax) >> 1;\
  pim = (by + ay) >> 1;\
  qre = (bx - ax) >> 1;\
  qim = (by - ay) >> 1;\
}

Definition at line 315 of file ac3enc.c.

Referenced by dct32(), ff_fft_calc_altivec(), ff_fft_calc_c(), fft(), and simple_idct248_put().

#define CMUL ( pre,
pim,
are,
aim,
bre,
bim   ) 

Value:

{\
   pre = (MUL16(are, bre) - MUL16(aim, bim)) >> 15;\
   pim = (MUL16(are, bim) + MUL16(bre, aim)) >> 15;\
}

Definition at line 330 of file ac3enc.c.

Referenced by ff_fft_calc_altivec(), ff_fft_calc_c(), ff_imdct_calc(), ff_mdct_calc(), fft(), and mdct512().

#define CRC16_POLY   ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16))

Definition at line 1241 of file ac3enc.c.

Referenced by ac3_crc_init(), and output_frame_end().

#define EXP_DIFF_THRESHOLD   1000

Definition at line 66 of file ac3enc.c.

Referenced by compute_exp_strategy().

#define MDCT_NBITS   9

Definition at line 62 of file ac3enc.c.

Referenced by AC3_encode_init(), and mdct512().

#define MUL16 ( a,
b   )     ((a) * (b))

Definition at line 328 of file ac3enc.c.

Referenced by AC3_encode_frame(), idctRowCondDC(), idctSparseCol(), idctSparseColAdd(), and idctSparseColPut().

#define N   (1 << MDCT_NBITS)

Definition at line 63 of file ac3enc.c.

Referenced by AC3_encode_frame(), AC3_encode_init(), compute_bit_allocation(), compute_exp_strategy(), encode_exp(), mdct512(), output_audio_block(), putseq(), ratectl_update_pict(), and readcmdline().

#define SNR_INC1   4

Definition at line 666 of file ac3enc.c.

Referenced by compute_bit_allocation().

Function Documentation

void ac3_common_init ( void   ) 

Definition at line 793 of file ac3enc.c.

References bndsz, bndtab, and masktab.

Referenced by AC3_encode_init().

static unsigned int ac3_crc ( uint8_t *  data,
int  n,
unsigned int  crc 
) [static]

Definition at line 1259 of file ac3enc.c.

References crc_table.

Referenced by output_frame_end().

static void ac3_crc_init ( void   )  [static]

Definition at line 1243 of file ac3enc.c.

References c, CRC16_POLY, and crc_table.

Referenced by AC3_encode_init().

static int AC3_encode_close ( AVCodecContext *  avctx  )  [static]

Definition at line 1465 of file ac3enc.c.

References av_freep(), and AVCodecContext::coded_frame.

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static int AC3_encode_frame ( AVCodecContext *  avctx,
unsigned char *  frame,
int  buf_size,
void *  data 
) [static]

Definition at line 1360 of file ac3enc.c.

References AC3_MAX_CHANNELS, ac3_window, compute_bit_allocation(), compute_exp_strategy(), e, encode_exp(), EXP_REUSE, exponent_min(), AC3EncodeContext::last_samples, AC3EncodeContext::lfe_channel, log2_tab(), lshift_tab(), mdct512(), memcpy, MUL16, N, AC3EncodeContext::nb_all_channels, NB_BLOCKS, AC3EncodeContext::nb_coefs, output_audio_block(), output_frame_end(), output_frame_header(), AVCodecContext::priv_data, s, and samples.

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static int AC3_encode_init ( AVCodecContext *  avctx  )  [static]

Definition at line 809 of file ac3enc.c.

References ac3_bitratetab, ac3_common_init(), ac3_crc_init(), AC3_FRAME_SIZE, ac3_freqs, AC3EncodeContext::acmod, avcodec_alloc_frame(), AC3EncodeContext::bit_rate, AVCodecContext::bit_rate, bitrate, AC3EncodeContext::bsid, AC3EncodeContext::bsmod, AVCodecContext::channels, AC3EncodeContext::chbwcod, AVCodecContext::coded_frame, AC3EncodeContext::csnroffst, fft_init(), fix15(), AC3EncodeContext::frame_size, AVCodecContext::frame_size, AC3EncodeContext::frame_size_min, AC3EncodeContext::frmsizecod, AC3EncodeContext::fscod, AC3EncodeContext::halfratecod, AC3EncodeContext::lfe, AC3EncodeContext::lfe_channel, M_PI, MDCT_NBITS, N, AC3EncodeContext::nb_all_channels, AC3EncodeContext::nb_channels, AC3EncodeContext::nb_coefs, AVCodecContext::priv_data, s, AC3EncodeContext::sample_rate, AVCodecContext::sample_rate, xcos1, and xsin1.

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void ac3_parametric_bit_allocation ( AC3BitAllocParameters *  s,
uint8_t *  bap,
int8_t *  exp,
int  start,
int  end,
int  snroffset,
int  fgain,
int  is_lfe,
int  deltbae,
int  deltnseg,
uint8_t *  deltoffst,
uint8_t *  deltlen,
uint8_t *  deltba 
)

Definition at line 118 of file ac3enc.c.

References baptab, bndsz, bndtab, c, calc_lowcomp(), calc_lowcomp1(), AC3BitAllocParameters::cplfleak, AC3BitAllocParameters::cplsleak, AC3BitAllocParameters::dbknee, AC3BitAllocParameters::fdecay, AC3BitAllocParameters::floor, AC3BitAllocParameters::fscod, AC3BitAllocParameters::halfratecod, hth, latab, masktab, AC3BitAllocParameters::sdecay, and AC3BitAllocParameters::sgain.

Referenced by bit_alloc().

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static int asym_quant ( int  c,
int  e,
int  qbits 
) [inline, static]

Definition at line 946 of file ac3enc.c.

Referenced by output_audio_block().

static int bit_alloc ( AC3EncodeContext *  s,
uint8_t  bap[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
uint8_t  encoded_exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
uint8_t  exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS],
int  frame_bits,
int  csnroffst,
int  fsnroffst 
) [static]

Definition at line 632 of file ac3enc.c.

References ac3_parametric_bit_allocation(), AC3EncodeContext::bit_alloc, compute_mantissa_size(), AC3EncodeContext::fgaincod, fgaintab, AC3EncodeContext::frame_size, AC3EncodeContext::lfe_channel, AC3EncodeContext::mant1_cnt, AC3EncodeContext::mant2_cnt, AC3EncodeContext::mant4_cnt, AC3EncodeContext::nb_all_channels, NB_BLOCKS, AC3EncodeContext::nb_coefs, and NULL.

Referenced by a_bit_allocation(), a_bit_allocation_new(), bits_for_nonoise_new(), compute_bit_allocation(), CRC_calc(), CRC_calcDAB(), encode_bit_alloc(), encode_frame(), encode_scale(), main_bit_allocation(), main_bit_allocation_new(), mp_decode_layer2(), MPA_encode_frame(), mpeg3audio_dolayer2(), sample_encoding(), subband_quantization(), subband_quantization_new(), toolame(), VBR_bit_allocation(), VBR_bit_allocation_new(), write_bit_alloc(), write_samples_new(), and write_scalefactors().

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static int calc_exp_diff ( uint8_t *  exp1,
uint8_t *  exp2,
int  n 
) [static]

Definition at line 444 of file ac3enc.c.

Referenced by compute_exp_strategy().

static int calc_lowcomp ( int  a,
int  b0,
int  b1,
int  bin 
) [inline, static]

Definition at line 93 of file ac3enc.c.

Referenced by ac3_parametric_bit_allocation().

static int calc_lowcomp1 ( int  a,
int  b0,
int  b1 
) [inline, static]

Definition at line 82 of file ac3enc.c.

Referenced by ac3_parametric_bit_allocation().

static int compute_bit_allocation ( AC3EncodeContext *  s,
uint8_t  bap[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
uint8_t  encoded_exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
uint8_t  exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS],
int  frame_bits 
) [static]

Definition at line 668 of file ac3enc.c.

References AC3EncodeContext::acmod, av_log(), AV_LOG_ERROR, bit_alloc(), AC3EncodeContext::bit_alloc, AC3EncodeContext::csnroffst, AC3BitAllocParameters::dbknee, AC3EncodeContext::dbkneecod, dbkneetab, EXP_REUSE, AC3BitAllocParameters::fdecay, AC3EncodeContext::fdecaycod, fdecaytab, AC3EncodeContext::fgaincod, AC3BitAllocParameters::floor, AC3EncodeContext::floorcod, floortab, AC3EncodeContext::fscod, AC3BitAllocParameters::fscod, AC3EncodeContext::fsnroffst, AC3EncodeContext::halfratecod, AC3BitAllocParameters::halfratecod, AC3EncodeContext::lfe, memcpy, N, AC3EncodeContext::nb_all_channels, NB_BLOCKS, AC3EncodeContext::nb_channels, AC3EncodeContext::nb_coefs, NULL, AC3BitAllocParameters::sdecay, AC3EncodeContext::sdecaycod, sdecaytab, AC3BitAllocParameters::sgain, AC3EncodeContext::sgaincod, sgaintab, and SNR_INC1.

Referenced by AC3_encode_frame(), and MPA_encode_frame().

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static void compute_exp_strategy ( uint8_t  exp_strategy[NB_BLOCKS][AC3_MAX_CHANNELS],
uint8_t  exp[NB_BLOCKS][AC3_MAX_CHANNELS][N/2],
int  ch,
int  is_lfe 
) [static]

Definition at line 454 of file ac3enc.c.

References av_log(), AV_LOG_DEBUG, calc_exp_diff(), EXP_D15, EXP_D25, EXP_D45, EXP_DIFF_THRESHOLD, EXP_NEW, EXP_REUSE, N, NB_BLOCKS, and NULL.

Referenced by AC3_encode_frame().

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static int compute_mantissa_size ( AC3EncodeContext *  s,
uint8_t *  m,
int  nb_coefs 
) [static]

Definition at line 582 of file ac3enc.c.

References bits, AC3EncodeContext::mant1_cnt, AC3EncodeContext::mant2_cnt, and AC3EncodeContext::mant4_cnt.

Referenced by bit_alloc().

static int encode_exp ( uint8_t  encoded_exp[N/2],
uint8_t  exp[N/2],
int  nb_exps,
int  exp_strategy 
) [static]

Definition at line 513 of file ac3enc.c.

References av_log(), AV_LOG_DEBUG, EXP_D15, EXP_D25, EXP_D45, N, and NULL.

Referenced by AC3_encode_frame().

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static void exponent_min ( uint8_t  exp[N/2],
uint8_t  exp1[N/2],
int  n 
) [static]

Definition at line 501 of file ac3enc.c.

Referenced by AC3_encode_frame().

static void fft ( IComplex *  z,
int  ln 
) [static]

Definition at line 338 of file ac3enc.c.

References BF, CMUL, costab, fft_rev, IComplex::im, IComplex::re, and sintab.

Referenced by mdct512().

static void fft_init ( int  ln  )  [static]

Definition at line 292 of file ac3enc.c.

References costab, fft_rev, fix15(), M_PI, and sintab.

Referenced by AC3_encode_init().

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static int16_t fix15 ( float  a  )  [inline, static]

Definition at line 71 of file ac3enc.c.

Referenced by AC3_encode_init(), and fft_init().

static int log2_tab ( int16_t *  tab,
int  n 
) [static]

Definition at line 1299 of file ac3enc.c.

Referenced by AC3_encode_frame().

static void lshift_tab ( int16_t *  tab,
int  n,
int  lshift 
) [static]

Definition at line 1310 of file ac3enc.c.

Referenced by AC3_encode_frame().

static void mdct512 ( int32_t *  out,
int16_t *  in 
) [static]

Definition at line 412 of file ac3enc.c.

References CMUL, fft(), IComplex::im, MDCT_NBITS, N, IComplex::re, xcos1, and xsin1.

Referenced by AC3_encode_frame().

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static unsigned int mul_poly ( unsigned int  a,
unsigned int  b,
unsigned int  poly 
) [static]

Definition at line 1268 of file ac3enc.c.

References c.

Referenced by output_frame_end(), and pow_poly().

static void output_audio_block ( AC3EncodeContext *  s,
uint8_t  exp_strategy[AC3_MAX_CHANNELS],
uint8_t  encoded_exp[AC3_MAX_CHANNELS][N/2],
uint8_t  bap[AC3_MAX_CHANNELS][N/2],
int32_t  mdct_coefs[AC3_MAX_CHANNELS][N/2],
int8_t  global_exp[AC3_MAX_CHANNELS],
int  block_num 
) [static]

Definition at line 966 of file ac3enc.c.

References AC3EncodeContext::acmod, asym_quant(), av_log(), AV_LOG_DEBUG, b, c, AC3EncodeContext::chbwcod, AC3EncodeContext::csnroffst, AC3EncodeContext::dbkneecod, e, EXP_D15, EXP_D25, EXP_D45, EXP_REUSE, AC3EncodeContext::fdecaycod, AC3EncodeContext::fgaincod, AC3EncodeContext::floorcod, AC3EncodeContext::fsnroffst, AC3EncodeContext::lfe, AC3EncodeContext::lfe_channel, N, AC3EncodeContext::nb_all_channels, AC3EncodeContext::nb_channels, AC3EncodeContext::nb_coefs, NULL, AC3EncodeContext::pb, put_bits(), AC3EncodeContext::sdecaycod, AC3EncodeContext::sgaincod, and sym_quant().

Referenced by AC3_encode_frame().

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static int output_frame_end ( AC3EncodeContext *  s  )  [static]

Definition at line 1327 of file ac3enc.c.

References ac3_crc(), PutBitContext::buf, CRC16_POLY, flush_put_bits(), AC3EncodeContext::frame_size, mul_poly(), AC3EncodeContext::pb, pbBufPtr(), and pow_poly().

Referenced by AC3_encode_frame().

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static void output_frame_header ( AC3EncodeContext *  s,
unsigned char *  frame 
) [static]

Definition at line 898 of file ac3enc.c.

References AC3_MAX_CODED_FRAME_SIZE, AC3EncodeContext::acmod, AC3EncodeContext::bsid, AC3EncodeContext::bsmod, AC3EncodeContext::frame_size, AC3EncodeContext::frame_size_min, AC3EncodeContext::frmsizecod, AC3EncodeContext::fscod, init_put_bits(), AC3EncodeContext::lfe, AC3EncodeContext::pb, and put_bits().

Referenced by AC3_encode_frame().

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static unsigned int pow_poly ( unsigned int  a,
unsigned int  n,
unsigned int  poly 
) [static]

Definition at line 1284 of file ac3enc.c.

References mul_poly(), and r.

Referenced by output_frame_end().

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static int sym_quant ( int  c,
int  e,
int  levels 
) [inline, static]

Definition at line 928 of file ac3enc.c.

Referenced by output_audio_block().

Variable Documentation

AVCodec ac3_encoder

Initial value:

 {
    "ac3",
    CODEC_TYPE_AUDIO,
    CODEC_ID_AC3,
    sizeof(AC3EncodeContext),
    AC3_encode_init,
    AC3_encode_frame,
    AC3_encode_close,
    NULL,
}

Definition at line 1563 of file ac3enc.c.

Referenced by avcodec_register_all().

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