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https://github.com/FFmpeg/FFmpeg.git
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110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/*
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* VC3/DNxHD decoder.
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* Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_DNXHDDATA_H
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#define AVCODEC_DNXHDDATA_H
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#include <stdint.h>
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#include "avcodec.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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/** Additional profile info flags */
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#define DNXHD_INTERLACED (1<<0)
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#define DNXHD_MBAFF (1<<1)
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#define DNXHD_444 (1<<2)
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/** Frame headers, extra 0x00 added to end for parser */
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#define DNXHD_HEADER_INITIAL 0x000002800100
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#define DNXHD_HEADER_444 0x000002800200
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/** Indicate that a CIDEntry value must be read in the bitstream */
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#define DNXHD_VARIABLE 0
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typedef struct CIDEntry {
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int cid;
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unsigned int width, height;
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unsigned int frame_size;
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unsigned int coding_unit_size;
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uint16_t flags;
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int index_bits;
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int bit_depth;
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int eob_index;
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const uint8_t *luma_weight, *chroma_weight;
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const uint8_t *dc_codes, *dc_bits;
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const uint16_t *ac_codes;
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const uint8_t *ac_bits, *ac_info;
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const uint16_t *run_codes;
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const uint8_t *run_bits, *run;
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int bit_rates[5]; ///< Helper to choose variants, rounded to nearest 5Mb/s
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AVRational packet_scale;
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} CIDEntry;
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extern const CIDEntry ff_dnxhd_cid_table[];
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int ff_dnxhd_get_cid_table(int cid);
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int ff_dnxhd_find_cid(AVCodecContext *avctx, int bit_depth);
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void ff_dnxhd_print_profiles(AVCodecContext *avctx, int loglevel);
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static av_always_inline uint64_t ff_dnxhd_check_header_prefix_hr(uint64_t prefix)
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{
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uint64_t data_offset = prefix >> 16;
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if ((prefix & 0xFFFF0000FFFFLL) == 0x0300 &&
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data_offset >= 0x0280 && data_offset <= 0x2170 &&
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(data_offset & 3) == 0)
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return prefix;
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return 0;
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}
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static av_always_inline uint64_t ff_dnxhd_check_header_prefix(uint64_t prefix)
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{
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if (prefix == DNXHD_HEADER_INITIAL ||
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prefix == DNXHD_HEADER_444 ||
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ff_dnxhd_check_header_prefix_hr(prefix))
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return prefix;
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return 0;
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}
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static av_always_inline uint64_t ff_dnxhd_parse_header_prefix(const uint8_t *buf)
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{
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uint64_t prefix = AV_RB32(buf);
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prefix = (prefix << 16) | buf[4] << 8;
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return ff_dnxhd_check_header_prefix(prefix);
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}
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static av_always_inline int ff_dnxhd_get_hr_frame_size(int cid, int w, int h)
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{
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int result, i = ff_dnxhd_get_cid_table(cid);
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if (i < 0)
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return i;
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result = ((h + 15) / 16) * ((w + 15) / 16) * (int64_t)ff_dnxhd_cid_table[i].packet_scale.num / ff_dnxhd_cid_table[i].packet_scale.den;
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result = (result + 2048) / 4096 * 4096;
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return FFMAX(result, 8192);
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}
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int avpriv_dnxhd_get_frame_size(int cid);
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int avpriv_dnxhd_get_interlaced(int cid);
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#endif /* AVCODEC_DNXHDDATA_H */
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