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https://github.com/FFmpeg/FFmpeg.git
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cab63a8b59
Silence a warning due to frame assignment in dvenc. All uses of the reference in dvdec are read only, except the ones in the main decoding function, so use the frame pointer directly there.
129 lines
3.7 KiB
C
129 lines
3.7 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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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_DV_H
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#define AVCODEC_DV_H
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#include "avcodec.h"
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#include "dv_profile.h"
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#include "get_bits.h"
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#include "me_cmp.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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typedef struct DVVideoContext {
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const AVDVProfile *sys;
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const AVFrame *frame;
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AVCodecContext *avctx;
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uint8_t *buf;
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uint8_t dv_zigzag[2][64];
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void (*get_pixels)(int16_t *block, const uint8_t *pixels, int line_size);
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void (*fdct[2])(int16_t *block);
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void (*idct_put[2])(uint8_t *dest, int line_size, int16_t *block);
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me_cmp_func ildct_cmp;
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DVwork_chunk work_chunks[4 * 12 * 27];
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uint32_t idct_factor[2 * 4 * 16 * 64];
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} DVVideoContext;
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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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#define TEX_VLC_BITS 9
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extern RL_VLC_ELEM ff_dv_rl_vlc[1184];
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int ff_dv_init_dynamic_tables(DVVideoContext *s, const AVDVProfile *d);
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int ff_dvvideo_init(AVCodecContext *avctx);
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static inline int dv_work_pool_size(const AVDVProfile *d)
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{
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int size = d->n_difchan * d->difseg_size * 27;
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if (DV_PROFILE_IS_1080i50(d))
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size -= 3 * 27;
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if (DV_PROFILE_IS_720p50(d))
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size -= 4 * 27;
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return size;
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}
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static inline void dv_calculate_mb_xy(DVVideoContext *s,
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DVwork_chunk *work_chunk,
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int m, int *mb_x, int *mb_y)
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{
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*mb_x = work_chunk->mb_coordinates[m] & 0xff;
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*mb_y = work_chunk->mb_coordinates[m] >> 8;
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/* We work with 720p frames split in half.
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* The odd half-frame (chan == 2,3) is displaced :-( */
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if (s->sys->height == 720 && !(s->buf[1] & 0x0C))
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/* shifting the Y coordinate down by 72/2 macro blocks */
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*mb_y -= (*mb_y > 17) ? 18 : -72;
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}
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#endif /* AVCODEC_DV_H */
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