1/* 2 * VC3/DNxHD decoder. 3 * Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#ifndef AVCODEC_DNXHDDATA_H 23#define AVCODEC_DNXHDDATA_H 24 25#include <stdint.h> 26#include "avcodec.h" 27#include "libavutil/attributes.h" 28#include "libavutil/intreadwrite.h" 29#include "libavutil/rational.h" 30 31/** Additional profile info flags */ 32#define DNXHD_INTERLACED (1<<0) 33#define DNXHD_MBAFF (1<<1) 34#define DNXHD_444 (1<<2) 35 36/** Frame headers, extra 0x00 added to end for parser */ 37#define DNXHD_HEADER_INITIAL 0x000002800100 38#define DNXHD_HEADER_444 0x000002800200 39 40/** Indicate that a CIDEntry value must be read in the bitstream */ 41#define DNXHD_VARIABLE 0 42 43typedef struct CIDEntry { 44 int cid; 45 unsigned int width, height; 46 unsigned int frame_size; 47 unsigned int coding_unit_size; 48 uint16_t flags; 49 int index_bits; 50 int bit_depth; 51 int eob_index; 52 const uint8_t *luma_weight, *chroma_weight; 53 const uint8_t *dc_codes, *dc_bits; 54 const uint16_t *ac_codes; 55 const uint8_t *ac_bits, *ac_info; 56 const uint16_t *run_codes; 57 const uint8_t *run_bits, *run; 58 int bit_rates[5]; ///< Helper to choose variants, rounded to nearest 5Mb/s 59 AVRational packet_scale; 60} CIDEntry; 61 62const CIDEntry *ff_dnxhd_get_cid_table(int cid); 63int ff_dnxhd_find_cid(AVCodecContext *avctx, int bit_depth); 64void ff_dnxhd_print_profiles(AVCodecContext *avctx, int loglevel); 65 66static av_always_inline uint64_t ff_dnxhd_check_header_prefix_hr(uint64_t prefix) 67{ 68 uint64_t data_offset = prefix >> 16; 69 if ((prefix & 0xFFFF0000FFFFLL) == 0x0300 && 70 data_offset >= 0x0280 && data_offset <= 0x2170 && 71 (data_offset & 3) == 0) 72 return prefix; 73 return 0; 74} 75 76static av_always_inline uint64_t ff_dnxhd_check_header_prefix(uint64_t prefix) 77{ 78 if (prefix == DNXHD_HEADER_INITIAL || 79 prefix == DNXHD_HEADER_444 || 80 ff_dnxhd_check_header_prefix_hr(prefix)) 81 return prefix; 82 return 0; 83} 84 85static av_always_inline uint64_t ff_dnxhd_parse_header_prefix(const uint8_t *buf) 86{ 87 uint64_t prefix = AV_RB32(buf); 88 prefix = (prefix << 16) | buf[4] << 8; 89 return ff_dnxhd_check_header_prefix(prefix); 90} 91 92int ff_dnxhd_get_frame_size(int cid); 93int ff_dnxhd_get_hr_frame_size(int cid, int w, int h); 94 95#endif /* AVCODEC_DNXHDDATA_H */ 96