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129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/*
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* Constants for DV codec
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* Copyright (c) 2002 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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/**
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* @file
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* Constants for DV codec.
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*/
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#ifndef AVCODEC_DV_H
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#define AVCODEC_DV_H
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#include "avcodec.h"
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#include "dv_profile.h"
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#include "get_bits.h"
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#include "me_cmp.h"
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typedef struct DVwork_chunk {
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uint16_t buf_offset;
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uint16_t mb_coordinates[5];
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} DVwork_chunk;
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typedef struct DVVideoContext {
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const AVDVProfile *sys;
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AVFrame *frame;
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AVCodecContext *avctx;
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uint8_t *buf;
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uint8_t dv_zigzag[2][64];
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void (*get_pixels)(int16_t *block, const uint8_t *pixels, int line_size);
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void (*fdct[2])(int16_t *block);
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void (*idct_put[2])(uint8_t *dest, int line_size, int16_t *block);
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me_cmp_func ildct_cmp;
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DVwork_chunk work_chunks[4 * 12 * 27];
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uint32_t idct_factor[2 * 4 * 16 * 64];
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} DVVideoContext;
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enum dv_section_type {
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dv_sect_header = 0x1f,
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dv_sect_subcode = 0x3f,
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dv_sect_vaux = 0x56,
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dv_sect_audio = 0x76,
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dv_sect_video = 0x96,
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};
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enum dv_pack_type {
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dv_header525 = 0x3f, /* see dv_write_pack for important details on */
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dv_header625 = 0xbf, /* these two packs */
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dv_timecode = 0x13,
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dv_audio_source = 0x50,
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dv_audio_control = 0x51,
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dv_audio_recdate = 0x52,
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dv_audio_rectime = 0x53,
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dv_video_source = 0x60,
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dv_video_control = 0x61,
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dv_video_recdate = 0x62,
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dv_video_rectime = 0x63,
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dv_unknown_pack = 0xff,
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};
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#define DV_PROFILE_IS_HD(p) ((p)->video_stype & 0x10)
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#define DV_PROFILE_IS_1080i50(p) (((p)->video_stype == 0x14) && ((p)->dsf == 1))
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#define DV_PROFILE_IS_720p50(p) (((p)->video_stype == 0x18) && ((p)->dsf == 1))
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/* minimum number of bytes to read from a DV stream in order to
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* determine the profile */
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#define DV_PROFILE_BYTES (6 * 80) /* 6 DIF blocks */
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/**
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* largest possible DV frame, in bytes (1080i50)
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*/
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#define DV_MAX_FRAME_SIZE 576000
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/**
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* maximum number of blocks per macroblock in any DV format
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*/
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#define DV_MAX_BPM 8
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#define TEX_VLC_BITS 9
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extern RL_VLC_ELEM ff_dv_rl_vlc[1184];
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int ff_dv_init_dynamic_tables(DVVideoContext *s, const AVDVProfile *d);
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int ff_dvvideo_init(AVCodecContext *avctx);
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static inline int dv_work_pool_size(const AVDVProfile *d)
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{
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int size = d->n_difchan * d->difseg_size * 27;
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if (DV_PROFILE_IS_1080i50(d))
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size -= 3 * 27;
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if (DV_PROFILE_IS_720p50(d))
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size -= 4 * 27;
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return size;
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}
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static inline void dv_calculate_mb_xy(DVVideoContext *s,
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DVwork_chunk *work_chunk,
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int m, int *mb_x, int *mb_y)
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{
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*mb_x = work_chunk->mb_coordinates[m] & 0xff;
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*mb_y = work_chunk->mb_coordinates[m] >> 8;
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/* We work with 720p frames split in half.
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* The odd half-frame (chan == 2,3) is displaced :-( */
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if (s->sys->height == 720 && !(s->buf[1] & 0x0C))
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/* shifting the Y coordinate down by 72/2 macro blocks */
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*mb_y -= (*mb_y > 17) ? 18 : -72;
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}
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#endif /* AVCODEC_DV_H */
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