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libavcodec
dv_profile.h
Go to the documentation of this file.
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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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#ifndef AVCODEC_DV_PROFILE_H
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#define AVCODEC_DV_PROFILE_H
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#include <stdint.h>
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#include "
libavutil/pixfmt.h
"
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#include "
libavutil/rational.h
"
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#include "
avcodec.h
"
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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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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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/*
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* DVprofile is used to express the differences between various
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* DV flavors. For now it's primarily used for differentiating
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* 525/60 and 625/50, but the plans are to use it for various
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* DV specs as well (e.g. SMPTE314M vs. IEC 61834).
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*/
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typedef
struct
DVprofile
{
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int
dsf
;
/* value of the dsf in the DV header */
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int
video_stype
;
/* stype for VAUX source pack */
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int
frame_size
;
/* total size of one frame in bytes */
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int
difseg_size
;
/* number of DIF segments per DIF channel */
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int
n_difchan
;
/* number of DIF channels per frame */
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AVRational
time_base
;
/* 1/framerate */
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int
ltc_divisor
;
/* FPS from the LTS standpoint */
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int
height
;
/* picture height in pixels */
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int
width
;
/* picture width in pixels */
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AVRational
sar
[2];
/* sample aspect ratios for 4:3 and 16:9 */
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DVwork_chunk
*
work_chunks
;
/* each thread gets its own chunk of frame to work on */
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uint32_t *
idct_factor
;
/* set of iDCT factor tables */
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enum
AVPixelFormat
pix_fmt
;
/* picture pixel format */
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int
bpm
;
/* blocks per macroblock */
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const
uint8_t
*
block_sizes
;
/* AC block sizes, in bits */
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int
audio_stride
;
/* size of audio_shuffle table */
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int
audio_min_samples
[3];
/* min amount of audio samples */
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/* for 48kHz, 44.1kHz and 32kHz */
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int
audio_samples_dist
[5];
/* how many samples are supposed to be */
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/* in each frame in a 5 frames window */
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const
uint8_t
(*
audio_shuffle
)[9];
/* PCM shuffling table */
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}
DVprofile
;
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const
DVprofile
*
avpriv_dv_frame_profile
(
const
DVprofile
*sys,
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const
uint8_t
*
frame
,
unsigned
buf_size);
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const
DVprofile
*
avpriv_dv_frame_profile2
(
AVCodecContext
* codec,
const
DVprofile
*sys,
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const
uint8_t
*
frame
,
unsigned
buf_size);
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const
DVprofile
*
avpriv_dv_codec_profile
(
AVCodecContext
* codec);
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/**
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* Print all allowed DV profiles into logctx at specified logging level.
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*/
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void
ff_dv_print_profiles
(
void
*logctx,
int
loglevel);
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#endif
/* AVCODEC_DV_PROFILE_H */
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