libavcodec/mpegaudiodec.c File Reference

MPEG Audio decoder. More...

#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
#include "mpegaudio.h"
#include "mpegaudiodecheader.h"
#include "mathops.h"
#include "mpegaudiodata.h"
#include "mpegaudiodectab.h"
#include "dct32.c"
#include "mpegaudio_tablegen.h"
#include "fft.h"

Go to the source code of this file.

Defines

#define SHR(a, b)   ((a)>>(b))
#define compute_antialias   compute_antialias_integer
#define FIXR_OLD(a)   ((int)((a) * FRAC_ONE + 0.5))
#define FIXR(a)   ((int)((a) * FRAC_ONE + 0.5))
#define FIXHR(a)   ((int)((a) * (1LL<<32) + 0.5))
#define MULH3(x, y, s)   MULH((s)*(x), y)
#define MULLx(x, y, s)   MULL(x,y,s)
#define RENAME(a)   a
#define HEADER_SIZE   4
#define SCALE_GEN(v)   { FIXR_OLD(1.0 * (v)), FIXR_OLD(0.7937005259 * (v)), FIXR_OLD(0.6299605249 * (v)) }
#define DEV_ORDER   13
#define POW_FRAC_BITS   24
#define POW_FRAC_ONE   (1 << POW_FRAC_BITS)
#define POW_FIX(a)   ((int)((a) * POW_FRAC_ONE))
#define POW_MULL(a, b)   (((int64_t)(a) * (int64_t)(b)) >> POW_FRAC_BITS)
#define MACS(rt, ra, rb)   MAC16(rt, ra, rb)
#define MULS(ra, rb)   MUL16(ra, rb)
#define MLSS(rt, ra, rb)   MLS16(rt, ra, rb)
#define SUM8(op, sum, w, p)
#define SUM8P2(sum1, op1, sum2, op2, w1, w2, p)
#define C3   FIXHR(0.86602540378443864676/2)
#define C1   FIXHR(0.98480775301220805936/2)
#define C2   FIXHR(0.93969262078590838405/2)
#define C3   FIXHR(0.86602540378443864676/2)
#define C4   FIXHR(0.76604444311897803520/2)
#define C5   FIXHR(0.64278760968653932632/2)
#define C6   FIXHR(0.5/2)
#define C7   FIXHR(0.34202014332566873304/2)
#define C8   FIXHR(0.17364817766693034885/2)
#define SPLIT(dst, sf, n)
#define READ_FLIP_SIGN(dst, src)
#define ISQRT2   FIXR(0.70710678118654752440)
#define INT_AA(j)

Functions

static void compute_antialias (MPADecodeContext *s, GranuleDef *g)
static void apply_window_mp3_c (MPA_INT *synth_buf, MPA_INT *window, int *dither_state, OUT_INT *samples, int incr)
 DECLARE_ALIGNED (16, MPA_INT, ff_mpa_synth_window_TMPL)[512+256]
static void ff_region_offset2size (GranuleDef *g)
 Convert region offsets to region sizes and truncate size to big_values.
static void ff_init_short_region (MPADecodeContext *s, GranuleDef *g)
static void ff_init_long_region (MPADecodeContext *s, GranuleDef *g, int ra1, int ra2)
static void ff_compute_band_indexes (MPADecodeContext *s, GranuleDef *g)
static int l1_unscale (int n, int mant, int scale_factor)
static int l2_unscale_group (int steps, int mant, int scale_factor)
static int l3_unscale (int value, int exponent)
static av_cold void int_pow_init (void)
static av_cold int decode_init (AVCodecContext *avctx)
static int round_sample (int *sum)
void av_cold ff_mpa_synth_init_TMPL (MPA_INT *window)
void ff_mpa_synth_filter (MPA_INT *synth_buf_ptr, int *synth_buf_offset, MPA_INT *window, int *dither_state, OUT_INT *samples, int incr, INTFLOAT sb_samples[SBLIMIT])
static void imdct12 (INTFLOAT *out, INTFLOAT *in)
static void imdct36 (INTFLOAT *out, INTFLOAT *buf, INTFLOAT *in, INTFLOAT *win)
static int mp_decode_layer1 (MPADecodeContext *s)
static int mp_decode_layer2 (MPADecodeContext *s)
static av_always_inline void lsf_sf_expand (int *slen, int sf, int n1, int n2, int n3)
static void exponents_from_scale_factors (MPADecodeContext *s, GranuleDef *g, int16_t *exponents)
static int get_bitsz (GetBitContext *s, int n)
static void switch_buffer (MPADecodeContext *s, int *pos, int *end_pos, int *end_pos2)
static int huffman_decode (MPADecodeContext *s, GranuleDef *g, int16_t *exponents, int end_pos2)
static void reorder_block (MPADecodeContext *s, GranuleDef *g)
static void compute_stereo (MPADecodeContext *s, GranuleDef *g0, GranuleDef *g1)
static void compute_antialias_integer (MPADecodeContext *s, GranuleDef *g)
static void compute_imdct (MPADecodeContext *s, GranuleDef *g, INTFLOAT *sb_samples, INTFLOAT *mdct_buf)
static int mp_decode_layer3 (MPADecodeContext *s)
static int mp_decode_frame (MPADecodeContext *s, OUT_INT *samples, const uint8_t *buf, int buf_size)
static int decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
static void flush (AVCodecContext *avctx)

Variables

static VLC huff_vlc [16]
static VLC_TYPE huff_vlc_tables [0+128+128+128+130+128+154+166+142+204+190+170+542+460+662+414][2]
static const int huff_vlc_tables_sizes [16]
static VLC huff_quad_vlc [2]
static VLC_TYPE huff_quad_vlc_tables [128+16][2]
static const int huff_quad_vlc_tables_sizes [2]
static uint16_t band_index_long [9][23]
static INTFLOAT is_table [2][16]
static INTFLOAT is_table_lsf [2][2][16]
static int32_t csa_table [8][4]
static float csa_table_float [8][4]
static INTFLOAT mdct_win [8][36]
static int16_t division_tab3 [1<< 6]
static int16_t division_tab5 [1<< 8]
static int16_t division_tab9 [1<< 11]
static int16_t *const division_tabs [4]
static uint16_t scale_factor_modshift [64]
static int32_t scale_factor_mult [15][3]
static const int32_t scale_factor_mult2 [3][3]
static int dev_4_3_coefs [DEV_ORDER]
static const INTFLOAT icos36 [9]
static const INTFLOAT icos36h [9]


Detailed Description

MPEG Audio decoder.

Definition in file mpegaudiodec.c.


Define Documentation

#define C1   FIXHR(0.98480775301220805936/2)

Definition at line 810 of file mpegaudiodec.c.

Referenced by DECLARE_ASM_CONST(), idct4col_add(), idct4col_put(), and imdct36().

#define C2   FIXHR(0.93969262078590838405/2)

Definition at line 811 of file mpegaudiodec.c.

Referenced by DECLARE_ASM_CONST(), idct4col_add(), idct4col_put(), and imdct36().

#define C3   FIXHR(0.86602540378443864676/2)

Definition at line 812 of file mpegaudiodec.c.

#define C3   FIXHR(0.86602540378443864676/2)

Definition at line 812 of file mpegaudiodec.c.

Referenced by DECLARE_ASM_CONST(), idct4col_add(), imdct12(), and imdct36().

#define C4   FIXHR(0.76604444311897803520/2)

Definition at line 813 of file mpegaudiodec.c.

Referenced by DECLARE_ASM_CONST(), idct_col(), and imdct36().

#define C5   FIXHR(0.64278760968653932632/2)

Definition at line 814 of file mpegaudiodec.c.

Referenced by DECLARE_ASM_CONST(), and imdct36().

#define C6   FIXHR(0.5/2)

Definition at line 815 of file mpegaudiodec.c.

Referenced by DECLARE_ASM_CONST().

#define C7   FIXHR(0.34202014332566873304/2)

Definition at line 816 of file mpegaudiodec.c.

Referenced by DECLARE_ASM_CONST(), and imdct36().

#define C8   FIXHR(0.17364817766693034885/2)

Definition at line 817 of file mpegaudiodec.c.

Referenced by imdct36().

#define compute_antialias   compute_antialias_integer

Definition at line 53 of file mpegaudiodec.c.

Referenced by mp_decode_layer3().

#define DEV_ORDER   13

Definition at line 241 of file mpegaudiodec.c.

Referenced by int_pow_init().

#define FIXHR (  )     ((int)((a) * (1LL<<32) + 0.5))

Definition at line 57 of file mpegaudiodec.c.

Referenced by decode_init().

#define FIXR (  )     ((int)((a) * FRAC_ONE + 0.5))

Definition at line 56 of file mpegaudiodec.c.

Referenced by decode_init().

#define FIXR_OLD (  )     ((int)((a) * FRAC_ONE + 0.5))

Definition at line 55 of file mpegaudiodec.c.

#define HEADER_SIZE   4

Definition at line 65 of file mpegaudiodec.c.

#define INT_AA (  ) 

Value:

tmp0 = ptr[-1-j];\
            tmp1 = ptr[   j];\
            tmp2= MULH(tmp0 + tmp1, csa[0+4*j]);\
            ptr[-1-j] = 4*(tmp2 - MULH(tmp1, csa[2+4*j]));\
            ptr[   j] = 4*(tmp2 + MULH(tmp0, csa[3+4*j]));

Referenced by compute_antialias_integer().

#define ISQRT2   FIXR(0.70710678118654752440)

Definition at line 1450 of file mpegaudiodec.c.

Referenced by compute_stereo().

#define MACS ( rt,
ra,
rb   )     MAC16(rt, ra, rb)

Definition at line 553 of file mpegaudiodec.c.

Referenced by apply_window_mp3(), and apply_window_mp3_c().

#define MLSS ( rt,
ra,
rb   )     MLS16(rt, ra, rb)

Definition at line 558 of file mpegaudiodec.c.

Referenced by apply_window_mp3(), and apply_window_mp3_c().

#define MULH3 ( x,
y,
 )     MULH((s)*(x), y)

Definition at line 58 of file mpegaudiodec.c.

Referenced by compute_imdct(), imdct12(), and imdct36().

#define MULLx ( x,
y,
 )     MULL(x,y,s)

Definition at line 59 of file mpegaudiodec.c.

Referenced by compute_stereo(), decode_init(), and imdct36().

#define MULS ( ra,
rb   )     MUL16(ra, rb)

Definition at line 556 of file mpegaudiodec.c.

#define POW_FIX (  )     ((int)((a) * POW_FRAC_ONE))

Definition at line 245 of file mpegaudiodec.c.

Referenced by int_pow_init().

#define POW_FRAC_BITS   24

Definition at line 243 of file mpegaudiodec.c.

#define POW_FRAC_ONE   (1 << POW_FRAC_BITS)

Definition at line 244 of file mpegaudiodec.c.

#define POW_MULL ( a,
 )     (((int64_t)(a) * (int64_t)(b)) >> POW_FRAC_BITS)

Definition at line 246 of file mpegaudiodec.c.

Referenced by int_pow_init().

#define READ_FLIP_SIGN ( dst,
src   ) 

Value:

v= -get_bits1(&s->gb);\
            *(dst) = (*(src) ^ v) - v;

Definition at line 1255 of file mpegaudiodec.c.

Referenced by huffman_decode().

#define RENAME (  )     a

#define SCALE_GEN (  )     { FIXR_OLD(1.0 * (v)), FIXR_OLD(0.7937005259 * (v)), FIXR_OLD(0.6299605249 * (v)) }

Definition at line 119 of file mpegaudiodec.c.

#define SHR ( a,
 )     ((a)>>(b))

Definition at line 52 of file mpegaudiodec.c.

Referenced by imdct12(), and imdct36().

#define SPLIT ( dst,
sf,
 ) 

Value:

if(n==3){\
        int m= (sf*171)>>9;\
        dst= sf - 3*m;\
        sf=m;\
    }else if(n==4){\
        dst= sf&3;\
        sf>>=2;\
    }else if(n==5){\
        int m= (sf*205)>>10;\
        dst= sf - 5*m;\
        sf=m;\
    }else if(n==6){\
        int m= (sf*171)>>10;\
        dst= sf - 6*m;\
        sf=m;\
    }else{\
        dst=0;\
    }

Definition at line 1155 of file mpegaudiodec.c.

Referenced by lsf_sf_expand().

#define SUM8 ( op,
sum,
w,
 ) 

Value:

{                                         \
    op(sum, (w)[0 * 64], (p)[0 * 64]);    \
    op(sum, (w)[1 * 64], (p)[1 * 64]);    \
    op(sum, (w)[2 * 64], (p)[2 * 64]);    \
    op(sum, (w)[3 * 64], (p)[3 * 64]);    \
    op(sum, (w)[4 * 64], (p)[4 * 64]);    \
    op(sum, (w)[5 * 64], (p)[5 * 64]);    \
    op(sum, (w)[6 * 64], (p)[6 * 64]);    \
    op(sum, (w)[7 * 64], (p)[7 * 64]);    \
}

Definition at line 575 of file mpegaudiodec.c.

Referenced by apply_window_mp3(), and apply_window_mp3_c().

#define SUM8P2 ( sum1,
op1,
sum2,
op2,
w1,
w2,
 ) 

Value:

{                                               \
    INTFLOAT tmp;\
    tmp = p[0 * 64];\
    op1(sum1, (w1)[0 * 64], tmp);\
    op2(sum2, (w2)[0 * 64], tmp);\
    tmp = p[1 * 64];\
    op1(sum1, (w1)[1 * 64], tmp);\
    op2(sum2, (w2)[1 * 64], tmp);\
    tmp = p[2 * 64];\
    op1(sum1, (w1)[2 * 64], tmp);\
    op2(sum2, (w2)[2 * 64], tmp);\
    tmp = p[3 * 64];\
    op1(sum1, (w1)[3 * 64], tmp);\
    op2(sum2, (w2)[3 * 64], tmp);\
    tmp = p[4 * 64];\
    op1(sum1, (w1)[4 * 64], tmp);\
    op2(sum2, (w2)[4 * 64], tmp);\
    tmp = p[5 * 64];\
    op1(sum1, (w1)[5 * 64], tmp);\
    op2(sum2, (w2)[5 * 64], tmp);\
    tmp = p[6 * 64];\
    op1(sum1, (w1)[6 * 64], tmp);\
    op2(sum2, (w2)[6 * 64], tmp);\
    tmp = p[7 * 64];\
    op1(sum1, (w1)[7 * 64], tmp);\
    op2(sum2, (w2)[7 * 64], tmp);\
}

Definition at line 587 of file mpegaudiodec.c.

Referenced by apply_window_mp3_c().


Function Documentation

static void apply_window_mp3_c ( MPA_INT synth_buf,
MPA_INT window,
int *  dither_state,
OUT_INT samples,
int  incr 
) [static]

Definition at line 646 of file mpegaudiodec.c.

Referenced by decode_init(), and ff_mpa_synth_filter().

static void compute_antialias ( MPADecodeContext s,
GranuleDef g 
) [static]

static void compute_antialias_integer ( MPADecodeContext s,
GranuleDef g 
) [static]

Definition at line 1578 of file mpegaudiodec.c.

static void compute_imdct ( MPADecodeContext s,
GranuleDef g,
INTFLOAT *  sb_samples,
INTFLOAT *  mdct_buf 
) [static]

Definition at line 1619 of file mpegaudiodec.c.

Referenced by mp_decode_layer3().

static void compute_stereo ( MPADecodeContext s,
GranuleDef g0,
GranuleDef g1 
) [static]

Definition at line 1452 of file mpegaudiodec.c.

Referenced by mp_decode_layer3().

DECLARE_ALIGNED ( 16  ,
MPA_INT  ,
ff_mpa_synth_window_TMPL   
)

static int decode_frame ( AVCodecContext avctx,
void *  data,
int *  data_size,
AVPacket avpkt 
) [static]

Definition at line 2030 of file mpegaudiodec.c.

static av_cold int decode_init ( AVCodecContext avctx  )  [static]

Definition at line 316 of file mpegaudiodec.c.

static void exponents_from_scale_factors ( MPADecodeContext s,
GranuleDef g,
int16_t *  exponents 
) [static]

Definition at line 1184 of file mpegaudiodec.c.

Referenced by mp_decode_layer3().

static void ff_compute_band_indexes ( MPADecodeContext s,
GranuleDef g 
) [static]

Definition at line 168 of file mpegaudiodec.c.

static void ff_init_long_region ( MPADecodeContext s,
GranuleDef g,
int  ra1,
int  ra2 
) [static]

Definition at line 158 of file mpegaudiodec.c.

static void ff_init_short_region ( MPADecodeContext s,
GranuleDef g 
) [static]

Definition at line 144 of file mpegaudiodec.c.

void ff_mpa_synth_filter ( MPA_INT synth_buf_ptr,
int *  synth_buf_offset,
MPA_INT window,
int *  dither_state,
OUT_INT samples,
int  incr,
INTFLOAT  sb_samples[SBLIMIT] 
)

Definition at line 705 of file mpegaudiodec.c.

Referenced by mp_decode_frame(), mpc_synth(), and qdm2_synthesis_filter().

void av_cold ff_mpa_synth_init_TMPL ( MPA_INT window  ) 

Definition at line 616 of file mpegaudiodec.c.

static void ff_region_offset2size ( GranuleDef g  )  [static]

Convert region offsets to region sizes and truncate size to big_values.

Definition at line 134 of file mpegaudiodec.c.

Referenced by mp_decode_layer3().

static void flush ( AVCodecContext avctx  )  [static]

Definition at line 2085 of file mpegaudiodec.c.

static int get_bitsz ( GetBitContext s,
int  n 
) [inline, static]

Definition at line 1223 of file mpegaudiodec.c.

Referenced by huffman_decode().

static int huffman_decode ( MPADecodeContext s,
GranuleDef g,
int16_t *  exponents,
int  end_pos2 
) [static]

Definition at line 1260 of file mpegaudiodec.c.

Referenced by mp_decode_layer3().

static void imdct12 ( INTFLOAT *  out,
INTFLOAT *  in 
) [static]

Definition at line 768 of file mpegaudiodec.c.

Referenced by compute_imdct().

static void imdct36 ( INTFLOAT *  out,
INTFLOAT *  buf,
INTFLOAT *  in,
INTFLOAT *  win 
) [static]

Definition at line 821 of file mpegaudiodec.c.

Referenced by compute_imdct().

static av_cold void int_pow_init ( void   )  [static]

Definition at line 258 of file mpegaudiodec.c.

Referenced by decode_init().

static int l1_unscale ( int  n,
int  mant,
int  scale_factor 
) [inline, static]

Definition at line 194 of file mpegaudiodec.c.

Referenced by mp_decode_layer1(), and mp_decode_layer2().

static int l2_unscale_group ( int  steps,
int  mant,
int  scale_factor 
) [inline, static]

Definition at line 208 of file mpegaudiodec.c.

Referenced by mp_decode_layer2().

static int l3_unscale ( int  value,
int  exponent 
) [inline, static]

Definition at line 224 of file mpegaudiodec.c.

Referenced by huffman_decode().

static av_always_inline void lsf_sf_expand ( int *  slen,
int  sf,
int  n1,
int  n2,
int  n3 
) [static]

Definition at line 1175 of file mpegaudiodec.c.

Referenced by mp_decode_layer3().

static int mp_decode_frame ( MPADecodeContext s,
OUT_INT samples,
const uint8_t *  buf,
int  buf_size 
) [static]

Definition at line 1955 of file mpegaudiodec.c.

static int mp_decode_layer1 ( MPADecodeContext s  )  [static]

Definition at line 902 of file mpegaudiodec.c.

Referenced by mp_decode_frame().

static int mp_decode_layer2 ( MPADecodeContext s  )  [static]

Definition at line 968 of file mpegaudiodec.c.

Referenced by mp_decode_frame().

static int mp_decode_layer3 ( MPADecodeContext s  )  [static]

Definition at line 1711 of file mpegaudiodec.c.

Referenced by mp_decode_frame().

static void reorder_block ( MPADecodeContext s,
GranuleDef g 
) [static]

Definition at line 1416 of file mpegaudiodec.c.

Referenced by mp_decode_layer3().

static int round_sample ( int *  sum  )  [inline, static]

Definition at line 544 of file mpegaudiodec.c.

Referenced by apply_window_mp3_c().

static void switch_buffer ( MPADecodeContext s,
int *  pos,
int *  end_pos,
int *  end_pos2 
) [static]

Definition at line 1232 of file mpegaudiodec.c.

Referenced by huffman_decode().


Variable Documentation

uint16_t band_index_long[9][23] [static]

Definition at line 96 of file mpegaudiodec.c.

Referenced by decode_init(), and ff_init_long_region().

int32_t csa_table[8][4] [static]

Definition at line 101 of file mpegaudiodec.c.

Referenced by compute_antialias_integer(), and decode_init().

float csa_table_float[8][4] [static]

Definition at line 102 of file mpegaudiodec.c.

Referenced by compute_antialias_float(), and decode_init().

int dev_4_3_coefs[DEV_ORDER] [static]

Definition at line 248 of file mpegaudiodec.c.

int16_t division_tab3[1<< 6] [static]

Definition at line 105 of file mpegaudiodec.c.

int16_t division_tab5[1<< 8] [static]

Definition at line 106 of file mpegaudiodec.c.

int16_t division_tab9[1<< 11] [static]

Definition at line 107 of file mpegaudiodec.c.

int16_t* const division_tabs[4] [static]

Initial value:

Definition at line 109 of file mpegaudiodec.c.

Referenced by decode_init(), and mp_decode_layer2().

VLC huff_quad_vlc[2] [static]

Definition at line 90 of file mpegaudiodec.c.

VLC_TYPE huff_quad_vlc_tables[128+16][2] [static]

Definition at line 91 of file mpegaudiodec.c.

Referenced by decode_init().

const int huff_quad_vlc_tables_sizes[2] [static]

Initial value:

 {
  128, 16
}

Definition at line 92 of file mpegaudiodec.c.

Referenced by decode_init().

VLC huff_vlc[16] [static]

Definition at line 81 of file mpegaudiodec.c.

VLC_TYPE huff_vlc_tables[0+128+128+128+130+128+154+166+142+204+190+170+542+460+662+414][2] [static]

Definition at line 85 of file mpegaudiodec.c.

Referenced by decode_init().

const int huff_vlc_tables_sizes[16] [static]

Initial value:

 {
  0, 128, 128, 128, 130, 128, 154, 166,
  142, 204, 190, 170, 542, 460, 662, 414
}

Definition at line 86 of file mpegaudiodec.c.

Referenced by decode_init().

const INTFLOAT icos36[9] [static]

Initial value:

 {
    FIXR(0.50190991877167369479),
    FIXR(0.51763809020504152469), 
    FIXR(0.55168895948124587824),
    FIXR(0.61038729438072803416),
    FIXR(0.70710678118654752439), 
    FIXR(0.87172339781054900991),
    FIXR(1.18310079157624925896),
    FIXR(1.93185165257813657349), 
    FIXR(5.73685662283492756461),
}

Definition at line 741 of file mpegaudiodec.c.

const INTFLOAT icos36h[9] [static]

Initial value:

 {
    FIXHR(0.50190991877167369479/2),
    FIXHR(0.51763809020504152469/2), 
    FIXHR(0.55168895948124587824/2),
    FIXHR(0.61038729438072803416/2),
    FIXHR(0.70710678118654752439/2), 
    FIXHR(0.87172339781054900991/2),
    FIXHR(1.18310079157624925896/4),
    FIXHR(1.93185165257813657349/4), 

}

Definition at line 754 of file mpegaudiodec.c.

INTFLOAT is_table[2][16] [static]

Definition at line 99 of file mpegaudiodec.c.

Referenced by compute_stereo(), and decode_init().

INTFLOAT is_table_lsf[2][2][16] [static]

Definition at line 100 of file mpegaudiodec.c.

Referenced by compute_stereo(), and decode_init().

INTFLOAT mdct_win[8][36] [static]

Definition at line 103 of file mpegaudiodec.c.

Referenced by compute_imdct(), and decode_init().

uint16_t scale_factor_modshift[64] [static]

Definition at line 114 of file mpegaudiodec.c.

Referenced by decode_init(), l1_unscale(), and l2_unscale_group().

int32_t scale_factor_mult[15][3] [static]

Definition at line 116 of file mpegaudiodec.c.

Referenced by decode_init(), encode_frame(), l1_unscale(), and MPA_encode_init().

const int32_t scale_factor_mult2[3][3] [static]

Initial value:

 {
    SCALE_GEN(4.0 / 3.0), 
    SCALE_GEN(4.0 / 5.0), 
    SCALE_GEN(4.0 / 9.0), 
}

Definition at line 122 of file mpegaudiodec.c.

Referenced by l2_unscale_group().


Generated on Mon May 2 19:50:20 2011 for FFmpeg by  doxygen 1.5.6