RV30/40 bitstream parsing

Functions
int	ff_rv34_get_start_offset (GetBitContext *gb, int mb_size)
static RV34VLC *	choose_vlc_set (int quant, int mod, int type)
static int	rv34_decode_dquant (GetBitContext *gb, int quant)

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Detailed Description

Decode macroblock header and return CBP in case of success, -1 otherwise.

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Function Documentation

static RV34VLC* choose_vlc_set	(	int	quant,
		int	mod,
		int	type
	)			[inline, static]

Select VLC set for decoding from current quantizer, modifier and frame type.

Definition at line 378 of file rv34.c.

References av_clip(), inter_vlcs, intra_vlcs, and rv34_quant_to_vlc_set.

Referenced by rv34_decode_macroblock(), and rv34_decode_mb_header().

{
    if(mod == 2 && quant < 19) quant += 10;
    else if(mod && quant < 26) quant += 5;
    return type ? &inter_vlcs[rv34_quant_to_vlc_set[1][av_clip(quant, 0, 30)]]
                : &intra_vlcs[rv34_quant_to_vlc_set[0][av_clip(quant, 0, 30)]];
}

int ff_rv34_get_start_offset	(	GetBitContext *	gb,
		int	mb_size
	)

Decode starting slice position.

Definition at line 366 of file rv34.c.

References rv34_mb_bits_sizes, and rv34_mb_max_sizes.

Referenced by rv30_parse_slice_header(), and rv40_parse_slice_header().

{
    int i;
    for(i = 0; i < 5; i++)
        if(rv34_mb_max_sizes[i] > mb_size)
            break;
    return rv34_mb_bits_sizes[i];
}

static int rv34_decode_dquant	(	GetBitContext *	gb,
		int	quant
	)			[inline, static]

Decode quantizer difference and return modified quantizer.

Definition at line 389 of file rv34.c.

References get_bits(), get_bits1(), and rv34_dquant_tab.

{
    if(get_bits1(gb))
        return rv34_dquant_tab[get_bits1(gb)][quant];
    else
        return get_bits(gb, 5);
}

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