FFmpeg
libavcodec
vc1_common.h
Go to the documentation of this file.
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/*
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* VC-1 and WMV3 decoder
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* Copyright (c) 2006-2007 Konstantin Shishkov
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* Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
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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_VC1_COMMON_H
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#define AVCODEC_VC1_COMMON_H
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#include <stdint.h>
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#include "
libavutil/attributes.h
"
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#include "
startcode.h
"
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/** Markers used in VC-1 AP frame data */
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//@{
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enum
VC1Code
{
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VC1_CODE_RES0
= 0x00000100,
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VC1_CODE_ENDOFSEQ
= 0x0000010A,
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VC1_CODE_SLICE
,
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VC1_CODE_FIELD
,
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VC1_CODE_FRAME
,
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VC1_CODE_ENTRYPOINT
,
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VC1_CODE_SEQHDR
,
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};
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//@}
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#define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
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/** Available Profiles */
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//@{
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enum
Profile
{
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PROFILE_SIMPLE
,
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PROFILE_MAIN
,
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PROFILE_COMPLEX
,
///< TODO: WMV9 specific
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PROFILE_ADVANCED
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};
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//@}
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/** Find VC-1 marker in buffer
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* @return position where next marker starts or end of buffer if no marker found
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*/
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static
av_always_inline
const
uint8_t*
find_next_marker
(
const
uint8_t *
src
,
const
uint8_t *end)
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{
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if
(end -
src
>= 4) {
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uint32_t mrk = 0xFFFFFFFF;
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src
=
avpriv_find_start_code
(
src
, end, &mrk);
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if
(
IS_MARKER
(mrk))
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return
src
- 4;
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}
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return
end;
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}
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static
av_always_inline
int
vc1_unescape_buffer
(
const
uint8_t *
src
,
int
size
, uint8_t *dst)
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{
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int
dsize = 0,
i
;
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if
(
size
< 4) {
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for
(dsize = 0; dsize <
size
; dsize++)
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*dst++ = *
src
++;
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return
size
;
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}
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for
(
i
= 0;
i
<
size
;
i
++,
src
++) {
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if
(
src
[0] == 3 &&
i
>= 2 && !
src
[-1] && !
src
[-2] &&
i
<
size
-1 &&
src
[1] < 4) {
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dst[dsize++] =
src
[1];
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src
++;
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i
++;
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}
else
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dst[dsize++] = *
src
;
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}
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return
dsize;
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}
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#endif
/* AVCODEC_VC1_COMMON_H */
PROFILE_MAIN
@ PROFILE_MAIN
Definition:
vc1_common.h:50
Profile
Profile
Available Profiles.
Definition:
vc1_common.h:48
PROFILE_SIMPLE
@ PROFILE_SIMPLE
Definition:
vc1_common.h:49
find_next_marker
static const av_always_inline uint8_t * find_next_marker(const uint8_t *src, const uint8_t *end)
Find VC-1 marker in buffer.
Definition:
vc1_common.h:59
PROFILE_COMPLEX
@ PROFILE_COMPLEX
TODO: WMV9 specific.
Definition:
vc1_common.h:51
VC1Code
VC1Code
Markers used in VC-1 AP frame data.
Definition:
vc1_common.h:33
VC1_CODE_RES0
@ VC1_CODE_RES0
Definition:
vc1_common.h:34
VC1_CODE_SLICE
@ VC1_CODE_SLICE
Definition:
vc1_common.h:36
PROFILE_ADVANCED
@ PROFILE_ADVANCED
Definition:
vc1_common.h:52
vc1_unescape_buffer
static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
Definition:
vc1_common.h:70
VC1_CODE_SEQHDR
@ VC1_CODE_SEQHDR
Definition:
vc1_common.h:40
VC1_CODE_FIELD
@ VC1_CODE_FIELD
Definition:
vc1_common.h:37
VC1_CODE_ENTRYPOINT
@ VC1_CODE_ENTRYPOINT
Definition:
vc1_common.h:39
avpriv_find_start_code
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
IS_MARKER
#define IS_MARKER(x)
Definition:
vc1_common.h:44
VC1_CODE_FRAME
@ VC1_CODE_FRAME
Definition:
vc1_common.h:38
startcode.h
size
int size
Definition:
twinvq_data.h:10344
attributes.h
i
#define i(width, name, range_min, range_max)
Definition:
cbs_h2645.c:256
av_always_inline
#define av_always_inline
Definition:
attributes.h:49
src
INIT_CLIP pixel * src
Definition:
h264pred_template.c:418
VC1_CODE_ENDOFSEQ
@ VC1_CODE_ENDOFSEQ
Definition:
vc1_common.h:35
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