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/*
* Constants for DV codec
* Copyright (c) 2002 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Constants for DV codec.
*/
#ifndef AVCODEC_DVDATA_H
#define AVCODEC_DVDATA_H
#include "libavutil/rational.h"
#include "avcodec.h"
#include "dsputil.h"
#include "get_bits.h"
typedef struct DVwork_chunk {
uint16_t buf_offset;
uint16_t mb_coordinates[5];
} DVwork_chunk;
/*
* DVprofile is used to express the differences between various
* DV flavors. For now it's primarily used for differentiating
* 525/60 and 625/50, but the plans are to use it for various
* DV specs as well (e.g. SMPTE314M vs. IEC 61834).
*/
typedef struct DVprofile {
int dsf; /* value of the dsf in the DV header */
int video_stype; /* stype for VAUX source pack */
int frame_size; /* total size of one frame in bytes */
int difseg_size; /* number of DIF segments per DIF channel */
int n_difchan; /* number of DIF channels per frame */
AVRational time_base; /* 1/framerate */
int ltc_divisor; /* FPS from the LTS standpoint */
int height; /* picture height in pixels */
int width; /* picture width in pixels */
AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */
DVwork_chunk *work_chunks; /* each thread gets its own chunk of frame to work on */
uint32_t *idct_factor; /* set of iDCT factor tables */
enum PixelFormat pix_fmt; /* picture pixel format */
int bpm; /* blocks per macroblock */
const uint8_t *block_sizes; /* AC block sizes, in bits */
int audio_stride; /* size of audio_shuffle table */
int audio_min_samples[3]; /* min amount of audio samples */
/* for 48kHz, 44.1kHz and 32kHz */
int audio_samples_dist[5]; /* how many samples are supposed to be */
/* in each frame in a 5 frames window */
const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */
} DVprofile;
typedef struct DVVideoContext {
const DVprofile *sys;
AVFrame picture;
AVCodecContext *avctx;
uint8_t *buf;
uint8_t dv_zigzag[2][64];
void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
void (*fdct[2])(DCTELEM *block);
void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
me_cmp_func ildct_cmp;
} DVVideoContext;
enum dv_section_type {
dv_sect_header = 0x1f,
dv_sect_subcode = 0x3f,
dv_sect_vaux = 0x56,
dv_sect_audio = 0x76,
dv_sect_video = 0x96,
};
enum dv_pack_type {
dv_header525 = 0x3f, /* see dv_write_pack for important details on */
dv_header625 = 0xbf, /* these two packs */
dv_timecode = 0x13,
dv_audio_source = 0x50,
dv_audio_control = 0x51,
dv_audio_recdate = 0x52,
dv_audio_rectime = 0x53,
dv_video_source = 0x60,
dv_video_control = 0x61,
dv_video_recdate = 0x62,
dv_video_rectime = 0x63,
dv_unknown_pack = 0xff,
};
#define DV_PROFILE_IS_HD(p) ((p)->video_stype & 0x10)
#define DV_PROFILE_IS_1080i50(p) (((p)->video_stype == 0x14) && ((p)->dsf == 1))
#define DV_PROFILE_IS_720p50(p) (((p)->video_stype == 0x18) && ((p)->dsf == 1))
/* minimum number of bytes to read from a DV stream in order to
determine the profile */
#define DV_PROFILE_BYTES (6*80) /* 6 DIF blocks */
/**
* largest possible DV frame, in bytes (1080i50)
*/
#define DV_MAX_FRAME_SIZE 576000
/**
* maximum number of blocks per macroblock in any DV format
*/
#define DV_MAX_BPM 8
#define TEX_VLC_BITS 9
extern RL_VLC_ELEM ff_dv_rl_vlc[1184];
const DVprofile* avpriv_dv_frame_profile(const DVprofile *sys,
const uint8_t* frame, unsigned buf_size);
const DVprofile* avpriv_dv_codec_profile(AVCodecContext* codec);
int ff_dv_init_dynamic_tables(const DVprofile *d);
int ff_dvvideo_init(AVCodecContext *avctx);
static inline int dv_work_pool_size(const DVprofile *d)
{
int size = d->n_difchan*d->difseg_size*27;
if (DV_PROFILE_IS_1080i50(d))
size -= 3*27;
if (DV_PROFILE_IS_720p50(d))
size -= 4*27;
return size;
}
static inline void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y)
{
*mb_x = work_chunk->mb_coordinates[m] & 0xff;
*mb_y = work_chunk->mb_coordinates[m] >> 8;
/* We work with 720p frames split in half. The odd half-frame (chan==2,3) is displaced :-( */
if (s->sys->height == 720 && !(s->buf[1]&0x0C)) {
*mb_y -= (*mb_y>17)?18:-72; /* shifting the Y coordinate down by 72/2 macro blocks */
}
}
#endif /* AVCODEC_DVDATA_H */
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