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0ed1eeb744
One that is fine enough to represent all DV audio sample rates. Audio
packet durations are now sample-accurate.
This largely undoes commit 76fbb0052d. To
avoid breaking the issue fixed by that commit, resync audio timestamps
against video if they get more than one frame apart. The sample from
issue #8762 still works correctly after this commit.
Slightly changes the results of the lavf-dv seektest, due to the audio
timebase being more granular.
75 lines
2.1 KiB
C
75 lines
2.1 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_DV_H
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#define AVCODEC_DV_H
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enum DVSectionType {
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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 DVPackType {
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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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// LCM of video framerate numerators
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#define DV_TIMESCALE_VIDEO 60000
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// LCM of audio sample rates
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#define DV_TIMESCALE_AUDIO 14112000
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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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#endif /* AVCODEC_DV_H */
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