2 * Constants for DV codec
3 * Copyright (c) 2002 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
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15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * Constants for DV codec.
27 #ifndef AVCODEC_DVDATA_H
28 #define AVCODEC_DVDATA_H
30 #include "libavutil/rational.h"
35 typedef struct DVwork_chunk {
37 uint16_t mb_coordinates[5];
41 * DVprofile is used to express the differences between various
42 * DV flavors. For now it's primarily used for differentiating
43 * 525/60 and 625/50, but the plans are to use it for various
44 * DV specs as well (e.g. SMPTE314M vs. IEC 61834).
46 typedef struct DVprofile {
47 int dsf; /* value of the dsf in the DV header */
48 int video_stype; /* stype for VAUX source pack */
49 int frame_size; /* total size of one frame in bytes */
50 int difseg_size; /* number of DIF segments per DIF channel */
51 int n_difchan; /* number of DIF channels per frame */
52 AVRational time_base; /* 1/framerate */
53 int ltc_divisor; /* FPS from the LTS standpoint */
54 int height; /* picture height in pixels */
55 int width; /* picture width in pixels */
56 AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */
57 DVwork_chunk *work_chunks; /* each thread gets its own chunk of frame to work on */
58 uint32_t *idct_factor; /* set of iDCT factor tables */
59 enum PixelFormat pix_fmt; /* picture pixel format */
60 int bpm; /* blocks per macroblock */
61 const uint8_t *block_sizes; /* AC block sizes, in bits */
62 int audio_stride; /* size of audio_shuffle table */
63 int audio_min_samples[3]; /* min amount of audio samples */
64 /* for 48kHz, 44.1kHz and 32kHz */
65 int audio_samples_dist[5]; /* how many samples are supposed to be */
66 /* in each frame in a 5 frames window */
67 const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */
70 typedef struct DVVideoContext {
73 AVCodecContext *avctx;
76 uint8_t dv_zigzag[2][64];
78 void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
79 void (*fdct[2])(DCTELEM *block);
80 void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
81 me_cmp_func ildct_cmp;
84 enum dv_section_type {
85 dv_sect_header = 0x1f,
86 dv_sect_subcode = 0x3f,
93 dv_header525 = 0x3f, /* see dv_write_pack for important details on */
94 dv_header625 = 0xbf, /* these two packs */
96 dv_audio_source = 0x50,
97 dv_audio_control = 0x51,
98 dv_audio_recdate = 0x52,
99 dv_audio_rectime = 0x53,
100 dv_video_source = 0x60,
101 dv_video_control = 0x61,
102 dv_video_recdate = 0x62,
103 dv_video_rectime = 0x63,
104 dv_unknown_pack = 0xff,
107 #define DV_PROFILE_IS_HD(p) ((p)->video_stype & 0x10)
108 #define DV_PROFILE_IS_1080i50(p) (((p)->video_stype == 0x14) && ((p)->dsf == 1))
109 #define DV_PROFILE_IS_720p50(p) (((p)->video_stype == 0x18) && ((p)->dsf == 1))
111 /* minimum number of bytes to read from a DV stream in order to
112 determine the profile */
113 #define DV_PROFILE_BYTES (6*80) /* 6 DIF blocks */
116 * largest possible DV frame, in bytes (1080i50)
118 #define DV_MAX_FRAME_SIZE 576000
121 * maximum number of blocks per macroblock in any DV format
125 #define TEX_VLC_BITS 9
127 extern RL_VLC_ELEM ff_dv_rl_vlc[1184];
129 const DVprofile* avpriv_dv_frame_profile(const DVprofile *sys,
130 const uint8_t* frame, unsigned buf_size);
131 const DVprofile* avpriv_dv_codec_profile(AVCodecContext* codec);
133 int ff_dv_init_dynamic_tables(const DVprofile *d);
134 int ff_dvvideo_init(AVCodecContext *avctx);
136 static inline int dv_work_pool_size(const DVprofile *d)
138 int size = d->n_difchan*d->difseg_size*27;
139 if (DV_PROFILE_IS_1080i50(d))
141 if (DV_PROFILE_IS_720p50(d))
146 static inline void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y)
148 *mb_x = work_chunk->mb_coordinates[m] & 0xff;
149 *mb_y = work_chunk->mb_coordinates[m] >> 8;
151 /* We work with 720p frames split in half. The odd half-frame (chan==2,3) is displaced :-( */
152 if (s->sys->height == 720 && !(s->buf[1]&0x0C)) {
153 *mb_y -= (*mb_y>17)?18:-72; /* shifting the Y coordinate down by 72/2 macro blocks */
158 * Print all allowed DV profiles into logctx at specified logging level.
160 void ff_dv_print_profiles(void *logctx, int loglevel);
162 #endif /* AVCODEC_DVDATA_H */