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libavcodec
dv.h
Go to the documentation of this file.
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/*
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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 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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/**
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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, ptrdiff_t 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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/**
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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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