mirror of https://git.ffmpeg.org/ffmpeg.git
116 lines
4.5 KiB
C
116 lines
4.5 KiB
C
/*
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* Constants for DV codec
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* Copyright (c) 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Constants for DV codec.
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*/
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#ifndef AVCODEC_DVDATA_H
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#define AVCODEC_DVDATA_H
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#include "libavutil/rational.h"
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#include "avcodec.h"
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typedef struct DVwork_chunk {
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uint16_t buf_offset;
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uint16_t mb_coordinates[5];
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} DVwork_chunk;
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/*
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* DVprofile is used to express the differences between various
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* DV flavors. For now it's primarily used for differentiating
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* 525/60 and 625/50, but the plans are to use it for various
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* DV specs as well (e.g. SMPTE314M vs. IEC 61834).
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*/
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typedef struct DVprofile {
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int dsf; /* value of the dsf in the DV header */
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int video_stype; /* stype for VAUX source pack */
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int frame_size; /* total size of one frame in bytes */
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int difseg_size; /* number of DIF segments per DIF channel */
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int n_difchan; /* number of DIF channels per frame */
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AVRational time_base; /* 1/framerate */
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int ltc_divisor; /* FPS from the LTS standpoint */
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int height; /* picture height in pixels */
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int width; /* picture width in pixels */
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AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */
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DVwork_chunk *work_chunks; /* each thread gets its own chunk of frame to work on */
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uint32_t *idct_factor; /* set of iDCT factor tables */
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enum PixelFormat pix_fmt; /* picture pixel format */
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int bpm; /* blocks per macroblock */
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const uint8_t *block_sizes; /* AC block sizes, in bits */
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int audio_stride; /* size of audio_shuffle table */
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int audio_min_samples[3]; /* min amount of audio samples */
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/* for 48kHz, 44.1kHz and 32kHz */
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int audio_samples_dist[5]; /* how many samples are supposed to be */
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/* in each frame in a 5 frames window */
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const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */
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} DVprofile;
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enum dv_section_type {
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dv_sect_header = 0x1f,
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dv_sect_subcode = 0x3f,
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dv_sect_vaux = 0x56,
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dv_sect_audio = 0x76,
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dv_sect_video = 0x96,
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};
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enum dv_pack_type {
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dv_header525 = 0x3f, /* see dv_write_pack for important details on */
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dv_header625 = 0xbf, /* these two packs */
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dv_timecode = 0x13,
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dv_audio_source = 0x50,
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dv_audio_control = 0x51,
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dv_audio_recdate = 0x52,
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dv_audio_rectime = 0x53,
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dv_video_source = 0x60,
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dv_video_control = 0x61,
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dv_video_recdate = 0x62,
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dv_video_rectime = 0x63,
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dv_unknown_pack = 0xff,
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};
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#define DV_PROFILE_IS_HD(p) ((p)->video_stype & 0x10)
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#define DV_PROFILE_IS_1080i50(p) (((p)->video_stype == 0x14) && ((p)->dsf == 1))
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#define DV_PROFILE_IS_720p50(p) (((p)->video_stype == 0x18) && ((p)->dsf == 1))
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/* minimum number of bytes to read from a DV stream in order to
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determine the profile */
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#define DV_PROFILE_BYTES (6*80) /* 6 DIF blocks */
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/**
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* largest possible DV frame, in bytes (1080i50)
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*/
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#define DV_MAX_FRAME_SIZE 576000
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/**
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* maximum number of blocks per macroblock in any DV format
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*/
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#define DV_MAX_BPM 8
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const DVprofile* avpriv_dv_frame_profile(const DVprofile *sys,
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const uint8_t* frame, unsigned buf_size);
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const DVprofile* avpriv_dv_frame_profile2(AVCodecContext* codec, const DVprofile *sys,
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const uint8_t* frame, unsigned buf_size);
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const DVprofile* avpriv_dv_codec_profile(AVCodecContext* codec);
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#endif /* AVCODEC_DVDATA_H */
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