blob: 9380a66f0705024c7f83d4ee8cc3d24d7c69df2a
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 | /* |
34 | * AVDVProfile is used to express the differences between various |
35 | * DV flavors. For now it's primarily used for differentiating |
36 | * 525/60 and 625/50, but the plans are to use it for various |
37 | * DV specs as well (e.g. SMPTE314M vs. IEC 61834). |
38 | */ |
39 | typedef struct AVDVProfile { |
40 | int dsf; /* value of the dsf in the DV header */ |
41 | int video_stype; /* stype for VAUX source pack */ |
42 | int frame_size; /* total size of one frame in bytes */ |
43 | int difseg_size; /* number of DIF segments per DIF channel */ |
44 | int n_difchan; /* number of DIF channels per frame */ |
45 | AVRational time_base; /* 1/framerate */ |
46 | int ltc_divisor; /* FPS from the LTS standpoint */ |
47 | int height; /* picture height in pixels */ |
48 | int width; /* picture width in pixels */ |
49 | AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */ |
50 | enum AVPixelFormat pix_fmt; /* picture pixel format */ |
51 | int bpm; /* blocks per macroblock */ |
52 | const uint8_t *block_sizes; /* AC block sizes, in bits */ |
53 | int audio_stride; /* size of audio_shuffle table */ |
54 | int audio_min_samples[3]; /* min amount of audio samples */ |
55 | /* for 48kHz, 44.1kHz and 32kHz */ |
56 | int audio_samples_dist[5]; /* how many samples are supposed to be */ |
57 | /* in each frame in a 5 frames window */ |
58 | const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */ |
59 | } AVDVProfile; |
60 | |
61 | /** |
62 | * Get a DV profile for the provided compressed frame. |
63 | * |
64 | * @param sys the profile used for the previous frame, may be NULL |
65 | * @param frame the compressed data buffer |
66 | * @param buf_size size of the buffer in bytes |
67 | * @return the DV profile for the supplied data or NULL on failure |
68 | */ |
69 | const AVDVProfile *av_dv_frame_profile(const AVDVProfile *sys, |
70 | const uint8_t *frame, unsigned buf_size); |
71 | |
72 | /** |
73 | * Get a DV profile for the provided stream parameters. |
74 | */ |
75 | const AVDVProfile *av_dv_codec_profile(int width, int height, enum AVPixelFormat pix_fmt); |
76 | |
77 | /** |
78 | * Get a DV profile for the provided stream parameters. |
79 | * The frame rate is used as a best-effort parameter. |
80 | */ |
81 | const AVDVProfile *av_dv_codec_profile2(int width, int height, enum AVPixelFormat pix_fmt, AVRational frame_rate); |
82 | |
83 | #endif /* AVCODEC_DV_PROFILE_H */ |
84 |