FFmpeg
dv_profile.h
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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,
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11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
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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  */
38 typedef 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 */
58 } AVDVProfile;
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 */
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:71
rational.h
AVDVProfile::sar
AVRational sar[2]
Definition: dv_profile.h:48
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.
Definition: dv_profile.c:305
AVDVProfile::difseg_size
int difseg_size
Definition: dv_profile.h:42
AVDVProfile::dsf
int dsf
Definition: dv_profile.h:39
width
#define width
pix_fmt
static enum AVPixelFormat pix_fmt
Definition: demux_decode.c:41
AVDVProfile::pix_fmt
enum AVPixelFormat pix_fmt
Definition: dv_profile.h:49
frame
static AVFrame * frame
Definition: demux_decode.c:54
AVDVProfile::n_difchan
int n_difchan
Definition: dv_profile.h:43
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
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.
Definition: dv_profile.c:299
AVDVProfile::audio_stride
int audio_stride
Definition: dv_profile.h:52
AVDVProfile::height
int height
Definition: dv_profile.h:46
height
#define height
AVDVProfile::block_sizes
const uint8_t * block_sizes
Definition: dv_profile.h:51
AVDVProfile::audio_samples_dist
int audio_samples_dist[5]
Definition: dv_profile.h:55
AVDVProfile::ltc_divisor
int ltc_divisor
Definition: dv_profile.h:45
AVDVProfile::width
int width
Definition: dv_profile.h:47
pixfmt.h
AVDVProfile::video_stype
int video_stype
Definition: dv_profile.h:40
AVDVProfile::audio_min_samples
int audio_min_samples[3]
Definition: dv_profile.h:53
AVDVProfile
Definition: dv_profile.h:38
AVDVProfile::time_base
AVRational time_base
Definition: dv_profile.h:44
AVDVProfile::audio_shuffle
const uint8_t(* audio_shuffle)[9]
Definition: dv_profile.h:57
AVDVProfile::bpm
int bpm
Definition: dv_profile.h:50
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.
Definition: dv_profile.c:315
AVDVProfile::frame_size
int frame_size
Definition: dv_profile.h:41