proresdec2.c File Reference

Known FOURCCs: 'apch' (HQ), 'apcn' (SD), 'apcs' (LT), 'acpo' (Proxy), 'ap4h' (4444) More...

#include "libavutil/internal.h"
#include "avcodec.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "internal.h"
#include "simple_idct.h"
#include "proresdec.h"
#include "proresdata.h"

Macros
#define	LONG_BITSTREAM_READER
#define	DECODE_CODEWORD(val, codebook, SKIP)
#define	TOSIGNED(x)   (((x) >> 1) ^ (-((x) & 1)))
#define	FIRST_DC_CB   0xB8

Variables
AVCodec	ff_prores_decoder

Detailed Description

Known FOURCCs: 'apch' (HQ), 'apcn' (SD), 'apcs' (LT), 'acpo' (Proxy), 'ap4h' (4444)

Macro Definition Documentation

DECODE_CODEWORD

#define DECODE_CODEWORD	(		val,
			codebook,
			SKIP
	)

Value:

do {                                                                \
        unsigned int rice_order, exp_order, switch_bits;                \
        unsigned int q, buf, bits;                                      \
                                                                        \
        UPDATE_CACHE(re, gb);                                           \
        buf = GET_CACHE(re, gb);                                        \
                                                                        \
        /* number of bits to switch between rice and exp golomb */      \
        switch_bits =  codebook & 3;                                    \
        rice_order  =  codebook >> 5;                                   \
        exp_order   = (codebook >> 2) & 7;                              \
                                                                        \
        q = 31 - av_log2(buf);                                          \
                                                                        \
        if (q > switch_bits) { /* exp golomb */                         \
            bits = exp_order - switch_bits + (q<<1);                    \
            if (bits > FFMIN(MIN_CACHE_BITS, 31))                       \
                return AVERROR_INVALIDDATA;                             \
            val = SHOW_UBITS(re, gb, bits) - (1 << exp_order) +         \
                ((switch_bits + 1) << rice_order);                      \
            SKIP(re, gb, bits);                                         \
        } else if (rice_order) {                                        \
            SKIP_BITS(re, gb, q+1);                                     \
            val = (q << rice_order) + SHOW_UBITS(re, gb, rice_order);   \
            SKIP(re, gb, rice_order);                                   \
        } else {                                                        \
            val = q;                                                    \
            SKIP(re, gb, q+1);                                          \
        }                                                               \
    } while (0)

Variable Documentation

ff_prores_decoder

AVCodec ff_prores_decoder

Initial value:

= {
    .name           = "prores",
    .long_name      = NULL_IF_CONFIG_SMALL("ProRes"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_PRORES,
    .priv_data_size = sizeof(ProresContext),
    .init           = decode_init,
    .close          = decode_close,
    .decode         = decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
}