FFmpeg: libavcodec/dv_profile.h Source File

FFmpeg
dv_profile.h
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1 /*
2  * This file is part of Libav.
3  *
4  * Libav 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  * Libav 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 Libav; 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  typedef struct DVwork_chunk {
33   uint16_t buf_offset;
34   uint16_t mb_coordinates[5];
35 } DVwork_chunk;
36 
37 /*
38  * DVprofile is used to express the differences between various
39  * DV flavors. For now it's primarily used for differentiating
40  * 525/60 and 625/50, but the plans are to use it for various
41  * DV specs as well (e.g. SMPTE314M vs. IEC 61834).
42  */
43  typedef struct DVprofile {
44   int dsf; /* value of the dsf in the DV header */
45   int video_stype; /* stype for VAUX source pack */
46   int frame_size; /* total size of one frame in bytes */
47   int difseg_size; /* number of DIF segments per DIF channel */
48   int n_difchan; /* number of DIF channels per frame */
49   AVRational time_base; /* 1/framerate */
50   int ltc_divisor; /* FPS from the LTS standpoint */
51   int height; /* picture height in pixels */
52   int width; /* picture width in pixels */
53   AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */
54   DVwork_chunk *work_chunks; /* each thread gets its own chunk of frame to work on */
55   uint32_t *idct_factor; /* set of iDCT factor tables */
56   enum AVPixelFormat pix_fmt; /* picture pixel format */
57   int bpm; /* blocks per macroblock */
58   const uint8_t *block_sizes; /* AC block sizes, in bits */
59   int audio_stride; /* size of audio_shuffle table */
60   int audio_min_samples[3]; /* min amount of audio samples */
61  /* for 48kHz, 44.1kHz and 32kHz */
62   int audio_samples_dist[5]; /* how many samples are supposed to be */
63  /* in each frame in a 5 frames window */
64   const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */
65 } DVprofile;
66 
67 const DVprofile* avpriv_dv_frame_profile(const DVprofile *sys,
68  const uint8_t* frame, unsigned buf_size);
69 const DVprofile* avpriv_dv_frame_profile2(AVCodecContext* codec, const DVprofile *sys,
70  const uint8_t* frame, unsigned buf_size);
71 const DVprofile* avpriv_dv_codec_profile(AVCodecContext* codec);
72 
73 /**
74  * Print all allowed DV profiles into logctx at specified logging level.
75  */
76 void ff_dv_print_profiles(void *logctx, int loglevel);
77 
78 #endif /* AVCODEC_DV_PROFILE_H */
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