atrac3plus.c File Reference

Bitstream parser for ATRAC3+ decoder. More...

#include "libavutil/avassert.h"
#include "avcodec.h"
#include "get_bits.h"
#include "atrac3plus.h"
#include "atrac3plus_data.h"

Macros
#define	UNPACK_SF_VQ_SHAPE(gb, dst, num_vals)
#define	DEC_CT_IDX_COMMON(OP)
#define	CODING_DIRECT   get_bits(gb, num_bits)
#define	CODING_VLC   get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1)
#define	CODING_VLC_DELTA
#define	CODING_VLC_DIFF

Functions
av_cold void	ff_atrac3p_init_vlcs (void)
	Initialize VLC tables for bitstream parsing.
int	ff_atrac3p_decode_channel_unit (GetBitContext *gb, Atrac3pChanUnitCtx *ctx, int num_channels, AVCodecContext *avctx)
	Decode bitstream data of a channel unit. More...

Detailed Description

Bitstream parser for ATRAC3+ decoder.

Macro Definition Documentation

CODING_VLC_DELTA

#define CODING_VLC_DELTA

Value:

(!i) ? CODING_VLC                                                   \
         : (pred + get_vlc2(gb, delta_vlc->table,                       \
                            delta_vlc->bits, 1)) & mask;                \
    pred = chan->qu_tab_idx[i]

CODING_VLC_DIFF

#define CODING_VLC_DIFF

Value:

(ref_chan->qu_tab_idx[i] +                                          \
     get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1)) & mask

DEC_CT_IDX_COMMON

#define DEC_CT_IDX_COMMON

(

OP

)

Value:

num_vals = get_num_ct_values(gb, ctx, avctx);                       \
    if (num_vals < 0)                                                   \
        return num_vals;                                                \
                                                                        \
    for (i = 0; i < num_vals; i++) {                                    \
        if (chan->qu_wordlen[i]) {                                      \
            chan->qu_tab_idx[i] = OP;                                   \
        } else if (ch_num && ref_chan->qu_wordlen[i])                   \
            /* get clone master flag */                                 \
            chan->qu_tab_idx[i] = get_bits1(gb);                        \
    }

UNPACK_SF_VQ_SHAPE

#define UNPACK_SF_VQ_SHAPE	(		gb,
			dst,
			num_vals
	)

Value:

start_val = get_bits((gb), 6);                                       \
    unpack_vq_shape(start_val, &atrac3p_sf_shapes[get_bits((gb), 6)][0], \
                    (dst), (num_vals))

Function Documentation

ff_atrac3p_decode_channel_unit()

int ff_atrac3p_decode_channel_unit	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	num_channels,
		AVCodecContext *	avctx
	)

Decode bitstream data of a channel unit.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	num_channels	number of channels to process
[in]	avctx	ptr to the AVCodecContext

Returns

result code: 0 = OK, otherwise - error code