twinvqdec.c File Reference

#include <math.h>
#include <stdint.h>
#include "libavutil/channel_layout.h"
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"
#include "twinvq.h"
#include "twinvq_data.h"

Go to the source code of this file.

Functions
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 (TwinVQContext *tctx, int period_coef, int g_coef, const float *shape, float *speech)
static void	dec_bark_env (TwinVQContext *tctx, const uint8_t *in, int use_hist, int ch, float *out, float gain, enum TwinVQFrameType ftype)
static void	read_cb_data (TwinVQContext *tctx, GetBitContext *gb, uint8_t *dst, enum TwinVQFrameType ftype)
static int	twinvq_read_bitstream (AVCodecContext *avctx, TwinVQContext *tctx, const uint8_t *buf, int buf_size)
static av_cold int	twinvq_decode_init (AVCodecContext *avctx)

Variables
static const TwinVQModeTab	mode_08_08
static const TwinVQModeTab	mode_11_08
static const TwinVQModeTab	mode_11_10
static const TwinVQModeTab	mode_16_16
static const TwinVQModeTab	mode_22_20
static const TwinVQModeTab	mode_22_24
static const TwinVQModeTab	mode_22_32
static const TwinVQModeTab	mode_44_40
static const TwinVQModeTab	mode_44_48
AVCodec	ff_twinvq_decoder

Function Documentation

static int very_broken_op ( int  a, int  b  )

static

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:

static int very_broken_op(int a, int b)
{
   static float test; // Ugh, force gcc to do the division first...

   test = a / 400.0;
   return b * test + 0.5;
}

Note

if this function is replaced by just ROUNDED_DIV(a * b, 400.0), the stddev between the original file (before encoding with Yamaha encoder) and the decoded output increases, which leads one to believe that the encoder expects exactly this broken calculation.

Definition at line 133 of file twinvqdec.c.

Referenced by add_peak().

static void add_peak ( int  period, int  width, const float *  shape, float  ppc_gain, float *  speech, int  len  )

static

Sum to data a periodic peak of a given period, width and shape.

Parameters

period

the period of the peak divided by 400.0

Definition at line 154 of file twinvqdec.c.

Referenced by decode_ppc().

static void decode_ppc ( TwinVQContext *  tctx, int  period_coef, int  g_coef, const float *  shape, float *  speech  )

static

Definition at line 178 of file twinvqdec.c.

Referenced by twinvq_decode_init().

static void dec_bark_env ( TwinVQContext *  tctx, const uint8_t *  in, int  use_hist, int  ch, float *  out, float  gain, enum TwinVQFrameType  ftype  )

static

Definition at line 210 of file twinvqdec.c.

Referenced by twinvq_decode_init().

static void read_cb_data ( TwinVQContext *  tctx, GetBitContext *  gb, uint8_t *  dst, enum TwinVQFrameType  ftype  )

static

Definition at line 238 of file twinvqdec.c.

Referenced by twinvq_read_bitstream().

static int twinvq_read_bitstream ( AVCodecContext *  avctx, TwinVQContext *  tctx, const uint8_t *  buf, int  buf_size  )

static

Definition at line 251 of file twinvqdec.c.

Referenced by twinvq_decode_init().

static av_cold int twinvq_decode_init ( AVCodecContext *  avctx )

static

Definition at line 319 of file twinvqdec.c.

Variable Documentation

const TwinVQModeTab mode_08_08

static

Initial value:

= {
    {
        { 8, bark_tab_s08_64,  10, tab.fcb08s, 1, 5, tab.cb0808s0, tab.cb0808s1, 18 },
        { 2, bark_tab_m08_256, 20, tab.fcb08m, 2, 5, tab.cb0808m0, tab.cb0808m1, 16 },
        { 1, bark_tab_l08_512, 30, tab.fcb08l, 3, 6, tab.cb0808l0, tab.cb0808l1, 17 }
    },
    512, 12, tab.lsp08, 1, 5, 3, 3, tab.shape08, 8, 28, 20, 6, 40
}

Definition at line 32 of file twinvqdec.c.

Referenced by twinvq_decode_init().

const TwinVQModeTab mode_11_08

static

Initial value:

= {
    {
        { 8, bark_tab_s11_64,  10, tab.fcb11s, 1, 5, tab.cb1108s0, tab.cb1108s1, 29 },
        { 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1108m0, tab.cb1108m1, 24 },
        { 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1108l0, tab.cb1108l1, 27 }
    },
    512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90
}

Definition at line 41 of file twinvqdec.c.

Referenced by twinvq_decode_init().

const TwinVQModeTab mode_11_10

static

Initial value:

= {
    {
        { 8, bark_tab_s11_64,  10, tab.fcb11s, 1, 5, tab.cb1110s0, tab.cb1110s1, 21 },
        { 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1110m0, tab.cb1110m1, 18 },
        { 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1110l0, tab.cb1110l1, 20 }
    },
    512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90
}

Definition at line 50 of file twinvqdec.c.

Referenced by twinvq_decode_init().

const TwinVQModeTab mode_16_16

static

Initial value:

= {
    {
        { 8, bark_tab_s16_128,  10, tab.fcb16s, 1, 5, tab.cb1616s0, tab.cb1616s1, 16 },
        { 2, bark_tab_m16_512,  20, tab.fcb16m, 2, 5, tab.cb1616m0, tab.cb1616m1, 15 },
        { 1, bark_tab_l16_1024, 30, tab.fcb16l, 3, 6, tab.cb1616l0, tab.cb1616l1, 16 }
    },
    1024, 16, tab.lsp16, 1, 6, 4, 3, tab.shape16, 9, 56, 60, 7, 180
}

Definition at line 59 of file twinvqdec.c.

Referenced by twinvq_decode_init().

const TwinVQModeTab mode_22_20

static

Initial value:

= {
    {
        { 8, bark_tab_s22_128,  10, tab.fcb22s_1, 1, 6, tab.cb2220s0, tab.cb2220s1, 18 },
        { 2, bark_tab_m22_512,  20, tab.fcb22m_1, 2, 6, tab.cb2220m0, tab.cb2220m1, 17 },
        { 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2220l0, tab.cb2220l1, 18 }
    },
    1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
}

Definition at line 68 of file twinvqdec.c.

Referenced by twinvq_decode_init().

const TwinVQModeTab mode_22_24

static

Initial value:

= {
    {
        { 8, bark_tab_s22_128,  10, tab.fcb22s_1, 1, 6, tab.cb2224s0, tab.cb2224s1, 15 },
        { 2, bark_tab_m22_512,  20, tab.fcb22m_1, 2, 6, tab.cb2224m0, tab.cb2224m1, 14 },
        { 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2224l0, tab.cb2224l1, 15 }
    },
    1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
}

Definition at line 77 of file twinvqdec.c.

Referenced by twinvq_decode_init().

const TwinVQModeTab mode_22_32

static

Initial value:

= {
    {
        { 4, bark_tab_s22_128, 10, tab.fcb22s_2, 1, 6, tab.cb2232s0, tab.cb2232s1, 11 },
        { 2, bark_tab_m22_256, 20, tab.fcb22m_2, 2, 6, tab.cb2232m0, tab.cb2232m1, 11 },
        { 1, bark_tab_l22_512, 32, tab.fcb22l_2, 4, 6, tab.cb2232l0, tab.cb2232l1, 12 }
    },
    512, 16, tab.lsp22_2, 1, 6, 4, 4, tab.shape22_2, 9, 56, 36, 7, 72
}

Definition at line 86 of file twinvqdec.c.

Referenced by twinvq_decode_init().

const TwinVQModeTab mode_44_40

static

Initial value:

= {
    {
        { 16, bark_tab_s44_128,  10, tab.fcb44s, 1, 6, tab.cb4440s0, tab.cb4440s1, 18 },
        { 4,  bark_tab_m44_512,  20, tab.fcb44m, 2, 6, tab.cb4440m0, tab.cb4440m1, 17 },
        { 1,  bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4440l0, tab.cb4440l1, 17 }
    },
    2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432
}

Definition at line 95 of file twinvqdec.c.

Referenced by twinvq_decode_init().

const TwinVQModeTab mode_44_48

static

Initial value:

= {
    {
        { 16, bark_tab_s44_128,  10, tab.fcb44s, 1, 6, tab.cb4448s0, tab.cb4448s1, 15 },
        { 4,  bark_tab_m44_512,  20, tab.fcb44m, 2, 6, tab.cb4448m0, tab.cb4448m1, 14 },
        { 1,  bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4448l0, tab.cb4448l1, 14 }
    },
    2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432
}

Definition at line 104 of file twinvqdec.c.

Referenced by twinvq_decode_init().

AVCodec ff_twinvq_decoder

Initial value:

= {
    .name           = "twinvq",
    .long_name      = NULL_IF_CONFIG_SMALL("VQF TwinVQ"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_TWINVQ,
    .priv_data_size = sizeof(TwinVQContext),
    .init           = twinvq_decode_init,
    .close          = ff_twinvq_decode_close,
    .decode         = ff_twinvq_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
                                                      AV_SAMPLE_FMT_NONE },
}

Definition at line 416 of file twinvqdec.c.