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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,
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 #include "avcodec.h"
27 
28 /* minimum number of bytes to read from a DV stream in order to
29  determine the profile */
30 #define DV_PROFILE_BYTES (6*80) /* 6 DIF blocks */
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 
61  const uint8_t* frame, unsigned buf_size);
62 #if LIBAVCODEC_VERSION_MAJOR < 56
64  const uint8_t* frame, unsigned buf_size);
66 #endif
67 
68 /**
69  * Get a DV profile for the provided compressed frame.
70  *
71  * @param sys the profile used for the previous frame, may be NULL
72  * @param frame the compressed data buffer
73  * @param buf_size size of the buffer in bytes
74  * @return the DV profile for the supplied data or NULL on failure
75  */
77  const uint8_t *frame, unsigned buf_size);
78 
79 /**
80  * Get a DV profile for the provided stream parameters.
81  */
83 
84 #endif /* AVCODEC_DV_PROFILE_H */