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dv_profile.h
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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_DV_PROFILE_H
#define AVCODEC_DV_PROFILE_H
#include <stdint.h>
#include "libavutil/pixfmt.h"
#include "libavutil/rational.h"
/* minimum number of bytes to read from a DV stream in order to
* determine the profile */
#define DV_PROFILE_BYTES (6 * 80) /* 6 DIF blocks */
/*
* AVDVProfile is used to express the differences between various
* DV flavors. For now it's primarily used for differentiating
* 525/60 and 625/50, but the plans are to use it for various
* DV specs as well (e.g. SMPTE314M vs. IEC 61834).
*/
typedef struct AVDVProfile {
int dsf; /* value of the dsf in the DV header */
int video_stype; /* stype for VAUX source pack */
int frame_size; /* total size of one frame in bytes */
int difseg_size; /* number of DIF segments per DIF channel */
int n_difchan; /* number of DIF channels per frame */
AVRational time_base; /* 1/framerate */
int ltc_divisor; /* FPS from the LTS standpoint */
int height; /* picture height in pixels */
int width; /* picture width in pixels */
AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */
enum AVPixelFormat pix_fmt; /* picture pixel format */
int bpm; /* blocks per macroblock */
const uint8_t *block_sizes; /* AC block sizes, in bits */
int audio_stride; /* size of audio_shuffle table */
int audio_min_samples[3]; /* min amount of audio samples */
/* for 48kHz, 44.1kHz and 32kHz */
int audio_samples_dist[5]; /* how many samples are supposed to be */
/* in each frame in a 5 frames window */
const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */
} AVDVProfile;
/**
* Get a DV profile for the provided compressed frame.
*
* @param sys the profile used for the previous frame, may be NULL
* @param frame the compressed data buffer
* @param buf_size size of the buffer in bytes
* @return the DV profile for the supplied data or NULL on failure
*/
const AVDVProfile *av_dv_frame_profile(const AVDVProfile *sys,
const uint8_t *frame, unsigned buf_size);
/**
* Get a DV profile for the provided stream parameters.
*/
const AVDVProfile *av_dv_codec_profile(int width, int height, enum AVPixelFormat pix_fmt);
/**
* Get a DV profile for the provided stream parameters.
* The frame rate is used as a best-effort parameter.
*/
const AVDVProfile *av_dv_codec_profile2(int width, int height, enum AVPixelFormat pix_fmt, AVRational frame_rate);
#endif /* AVCODEC_DV_PROFILE_H */
width
static int width
Definition demux_decode.c:40
pix_fmt
static enum AVPixelFormat pix_fmt
Definition demux_decode.c:41
height
static int height
Definition demux_decode.c:40
frame
static AVFrame * frame
Definition demux_decode.c:54
av_dv_codec_profile
const AVDVProfile * av_dv_codec_profile(int width, int height, enum AVPixelFormat pix_fmt)
Get a DV profile for the provided stream parameters.
av_dv_codec_profile2
const AVDVProfile * av_dv_codec_profile2(int width, int height, enum AVPixelFormat pix_fmt, AVRational frame_rate)
Get a DV profile for the provided stream parameters.
av_dv_frame_profile
const AVDVProfile * av_dv_frame_profile(const AVDVProfile *sys, const uint8_t *frame, unsigned buf_size)
Get a DV profile for the provided compressed frame.
pixfmt.h
pixel format definitions
AVPixelFormat
AVPixelFormat
Pixel format.
Definition pixfmt.h:71
rational.h
Utilities for rational number calculation.
AVDVProfile
Definition dv_profile.h:38
AVDVProfile::audio_samples_dist
int audio_samples_dist[5]
Definition dv_profile.h:55
AVDVProfile::bpm
int bpm
Definition dv_profile.h:50
AVDVProfile::ltc_divisor
int ltc_divisor
Definition dv_profile.h:45
AVDVProfile::time_base
AVRational time_base
Definition dv_profile.h:44
AVDVProfile::width
int width
Definition dv_profile.h:47
AVDVProfile::dsf
int dsf
Definition dv_profile.h:39
AVDVProfile::audio_shuffle
const uint8_t(* audio_shuffle)[9]
Definition dv_profile.h:57
AVDVProfile::audio_stride
int audio_stride
Definition dv_profile.h:52
AVDVProfile::audio_min_samples
int audio_min_samples[3]
Definition dv_profile.h:53
AVDVProfile::n_difchan
int n_difchan
Definition dv_profile.h:43
AVDVProfile::block_sizes
const uint8_t * block_sizes
Definition dv_profile.h:51
AVDVProfile::pix_fmt
enum AVPixelFormat pix_fmt
Definition dv_profile.h:49
AVDVProfile::height
int height
Definition dv_profile.h:46
AVDVProfile::sar
AVRational sar[2]
Definition dv_profile.h:48
AVDVProfile::video_stype
int video_stype
Definition dv_profile.h:40
AVDVProfile::difseg_size
int difseg_size
Definition dv_profile.h:42
AVDVProfile::frame_size
int frame_size
Definition dv_profile.h:41
AVRational
Rational number (pair of numerator and denominator).
Definition rational.h:58