FFmpeg 5.1.6
dv_profile.h
Go to the documentation of this file.
1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#ifndef AVCODEC_DV_PROFILE_H
20#define AVCODEC_DV_PROFILE_H
21
22#include <stdint.h>
23
24#include "libavutil/pixfmt.h"
25#include "libavutil/rational.h"
26
27/* minimum number of bytes to read from a DV stream in order to
28 * determine the profile */
29#define DV_PROFILE_BYTES (6 * 80) /* 6 DIF blocks */
30
31
32/*
33 * AVDVProfile is used to express the differences between various
34 * DV flavors. For now it's primarily used for differentiating
35 * 525/60 and 625/50, but the plans are to use it for various
36 * DV specs as well (e.g. SMPTE314M vs. IEC 61834).
37 */
38typedef struct AVDVProfile {
39 int dsf; /* value of the dsf in the DV header */
40 int video_stype; /* stype for VAUX source pack */
41 int frame_size; /* total size of one frame in bytes */
42 int difseg_size; /* number of DIF segments per DIF channel */
43 int n_difchan; /* number of DIF channels per frame */
44 AVRational time_base; /* 1/framerate */
45 int ltc_divisor; /* FPS from the LTS standpoint */
46 int height; /* picture height in pixels */
47 int width; /* picture width in pixels */
48 AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */
49 enum AVPixelFormat pix_fmt; /* picture pixel format */
50 int bpm; /* blocks per macroblock */
51 const uint8_t *block_sizes; /* AC block sizes, in bits */
52 int audio_stride; /* size of audio_shuffle table */
53 int audio_min_samples[3]; /* min amount of audio samples */
54 /* for 48kHz, 44.1kHz and 32kHz */
55 int audio_samples_dist[5]; /* how many samples are supposed to be */
56 /* in each frame in a 5 frames window */
57 const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */
59
60/**
61 * Get a DV profile for the provided compressed frame.
62 *
63 * @param sys the profile used for the previous frame, may be NULL
64 * @param frame the compressed data buffer
65 * @param buf_size size of the buffer in bytes
66 * @return the DV profile for the supplied data or NULL on failure
67 */
69 const uint8_t *frame, unsigned buf_size);
70
71/**
72 * Get a DV profile for the provided stream parameters.
73 */
75
76/**
77 * Get a DV profile for the provided stream parameters.
78 * The frame rate is used as a best-effort parameter.
79 */
81
82#endif /* AVCODEC_DV_PROFILE_H */
static int width
static enum AVPixelFormat pix_fmt
static int height
static AVFrame * frame
const AVDVProfile * av_dv_codec_profile(int width, int height, enum AVPixelFormat pix_fmt)
Get a DV profile for the provided stream parameters.
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.
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.
pixel format definitions
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
Utilties for rational number calculation.
int audio_samples_dist[5]
Definition: dv_profile.h:55
int ltc_divisor
Definition: dv_profile.h:45
AVRational time_base
Definition: dv_profile.h:44
const uint8_t(* audio_shuffle)[9]
Definition: dv_profile.h:57
int audio_stride
Definition: dv_profile.h:52
int audio_min_samples[3]
Definition: dv_profile.h:53
int n_difchan
Definition: dv_profile.h:43
const uint8_t * block_sizes
Definition: dv_profile.h:51
enum AVPixelFormat pix_fmt
Definition: dv_profile.h:49
AVRational sar[2]
Definition: dv_profile.h:48
int video_stype
Definition: dv_profile.h:40
int difseg_size
Definition: dv_profile.h:42
int frame_size
Definition: dv_profile.h:41
Rational number (pair of numerator and denominator).
Definition: rational.h:58