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/* |
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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_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 "me_cmp.h" |
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#include "vlc.h" |
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#include "idctdsp.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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AVClass *avclass; |
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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, ptrdiff_t linesize); |
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void (*fdct[2])(int16_t *block); |
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void (*idct_put[2])(uint8_t *dest, ptrdiff_t stride, 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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IDCTDSPContext idsp; |
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int quant_deadzone; |
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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_1080i60(p) (((p)->video_stype == 0x14) && ((p)->dsf == 0)) |
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#define DV_PROFILE_IS_720p50(p) (((p)->video_stype == 0x18) && ((p)->dsf == 1)) |
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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 10 |
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extern RL_VLC_ELEM ff_dv_rl_vlc[1664]; |
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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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✓✓✓✗
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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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✓✓✓✓
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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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✓✓ |
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*mb_y -= (*mb_y > 17) ? 18 : -72; |
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} |
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#endif /* AVCODEC_DV_H */ |