FFmpeg
libavcodec
dv_internal.h
Go to the documentation of this file.
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/*
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* DV encoder/decoder shared code
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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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#ifndef AVCODEC_DV_INTERNAL_H
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#define AVCODEC_DV_INTERNAL_H
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#include <stdint.h>
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#include "
dv.h
"
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#include "
dv_profile.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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void
ff_dv_init_dynamic_tables
(
DVwork_chunk
*work_chunks,
const
AVDVProfile
*d);
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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
(
const
AVDVProfile
*sys,
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const
uint8_t *buf,
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const
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
(sys->
height
== 720 && !(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_INTERNAL_H
DVwork_chunk::buf_offset
uint16_t buf_offset
Definition:
dv_internal.h:31
DVwork_chunk
Definition:
dv_internal.h:30
AVDVProfile::difseg_size
int difseg_size
Definition:
dv_profile.h:42
dv_profile.h
dv_work_pool_size
static int dv_work_pool_size(const AVDVProfile *d)
Definition:
dv_internal.h:37
DV_PROFILE_IS_1080i50
#define DV_PROFILE_IS_1080i50(p)
Definition:
dv.h:54
dv_calculate_mb_xy
static void dv_calculate_mb_xy(const AVDVProfile *sys, const uint8_t *buf, const DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y)
Definition:
dv_internal.h:47
DV_PROFILE_IS_720p50
#define DV_PROFILE_IS_720p50(p)
Definition:
dv.h:56
AVDVProfile::n_difchan
int n_difchan
Definition:
dv_profile.h:43
dv.h
size
int size
Definition:
twinvq_data.h:10344
AVDVProfile::height
int height
Definition:
dv_profile.h:46
DVwork_chunk::mb_coordinates
uint16_t mb_coordinates[5]
Definition:
dv_internal.h:32
AVDVProfile
Definition:
dv_profile.h:38
ff_dv_init_dynamic_tables
void ff_dv_init_dynamic_tables(DVwork_chunk *work_chunks, const AVDVProfile *d)
Definition:
dv.c:169
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