aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* VC3/DNxHD decoder.
* Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_DNXHDDATA_H
#define AVCODEC_DNXHDDATA_H
#include <stdint.h>
#include "avcodec.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
/** Additional profile info flags */
#define DNXHD_INTERLACED (1<<0)
#define DNXHD_MBAFF (1<<1)
#define DNXHD_444 (1<<2)
/** Frame headers, extra 0x00 added to end for parser */
#define DNXHD_HEADER_INITIAL 0x000002800100
#define DNXHD_HEADER_444 0x000002800200
/** Indicate that a CIDEntry value must be read in the bitstream */
#define DNXHD_VARIABLE 0
typedef struct CIDEntry {
int cid;
unsigned int width, height;
unsigned int frame_size;
unsigned int coding_unit_size;
uint16_t flags;
int index_bits;
int bit_depth;
int eob_index;
const uint8_t *luma_weight, *chroma_weight;
const uint8_t *dc_codes, *dc_bits;
const uint16_t *ac_codes;
const uint8_t *ac_bits, *ac_info;
const uint16_t *run_codes;
const uint8_t *run_bits, *run;
int bit_rates[5]; ///< Helper to choose variants, rounded to nearest 5Mb/s
AVRational packet_scale;
} CIDEntry;
extern const CIDEntry ff_dnxhd_cid_table[];
int ff_dnxhd_get_cid_table(int cid);
int ff_dnxhd_find_cid(AVCodecContext *avctx, int bit_depth);
void ff_dnxhd_print_profiles(AVCodecContext *avctx, int loglevel);
static av_always_inline uint64_t ff_dnxhd_check_header_prefix_hr(uint64_t prefix)
{
uint64_t data_offset = prefix >> 16;
if ((prefix & 0xFFFF0000FFFFLL) == 0x0300 &&
data_offset >= 0x0280 && data_offset <= 0x2170 &&
(data_offset & 3) == 0)
return prefix;
return 0;
}
static av_always_inline uint64_t ff_dnxhd_check_header_prefix(uint64_t prefix)
{
if (prefix == DNXHD_HEADER_INITIAL ||
prefix == DNXHD_HEADER_444 ||
ff_dnxhd_check_header_prefix_hr(prefix))
return prefix;
return 0;
}
static av_always_inline uint64_t ff_dnxhd_parse_header_prefix(const uint8_t *buf)
{
uint64_t prefix = AV_RB32(buf);
prefix = (prefix << 16) | buf[4] << 8;
return ff_dnxhd_check_header_prefix(prefix);
}
int avpriv_dnxhd_get_frame_size(int cid);
int avpriv_dnxhd_get_hr_frame_size(int cid, int w, int h);
int avpriv_dnxhd_get_interlaced(int cid);
#endif /* AVCODEC_DNXHDDATA_H */
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