750 lines
30 KiB
C
750 lines
30 KiB
C
/*
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* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2008 Peter Ross
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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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#ifndef AVUTIL_CHANNEL_LAYOUT_H
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#define AVUTIL_CHANNEL_LAYOUT_H
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#include <stdint.h>
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#include <stdlib.h>
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#include "version.h"
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#include "attributes.h"
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/**
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* @file
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* audio channel layout utility functions
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*/
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/**
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* @addtogroup lavu_audio
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* @{
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*/
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enum AVChannel {
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///< Invalid channel index
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AV_CHAN_NONE = -1,
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AV_CHAN_FRONT_LEFT,
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AV_CHAN_FRONT_RIGHT,
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AV_CHAN_FRONT_CENTER,
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AV_CHAN_LOW_FREQUENCY,
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AV_CHAN_BACK_LEFT,
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AV_CHAN_BACK_RIGHT,
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AV_CHAN_FRONT_LEFT_OF_CENTER,
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AV_CHAN_FRONT_RIGHT_OF_CENTER,
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AV_CHAN_BACK_CENTER,
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AV_CHAN_SIDE_LEFT,
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AV_CHAN_SIDE_RIGHT,
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AV_CHAN_TOP_CENTER,
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AV_CHAN_TOP_FRONT_LEFT,
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AV_CHAN_TOP_FRONT_CENTER,
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AV_CHAN_TOP_FRONT_RIGHT,
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AV_CHAN_TOP_BACK_LEFT,
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AV_CHAN_TOP_BACK_CENTER,
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AV_CHAN_TOP_BACK_RIGHT,
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/** Stereo downmix. */
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AV_CHAN_STEREO_LEFT = 29,
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/** See above. */
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AV_CHAN_STEREO_RIGHT,
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AV_CHAN_WIDE_LEFT,
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AV_CHAN_WIDE_RIGHT,
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AV_CHAN_SURROUND_DIRECT_LEFT,
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AV_CHAN_SURROUND_DIRECT_RIGHT,
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AV_CHAN_LOW_FREQUENCY_2,
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AV_CHAN_TOP_SIDE_LEFT,
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AV_CHAN_TOP_SIDE_RIGHT,
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AV_CHAN_BOTTOM_FRONT_CENTER,
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AV_CHAN_BOTTOM_FRONT_LEFT,
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AV_CHAN_BOTTOM_FRONT_RIGHT,
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/** Channel is empty can be safely skipped. */
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AV_CHAN_UNUSED = 0x200,
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/** Channel contains data, but its position is unknown. */
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AV_CHAN_UNKNOWN = 0x300,
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/**
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* Range of channels between AV_CHAN_AMBISONIC_BASE and
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* AV_CHAN_AMBISONIC_END represent Ambisonic components using the ACN system.
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*
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* Given a channel id <i> between AV_CHAN_AMBISONIC_BASE and
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* AV_CHAN_AMBISONIC_END (inclusive), the ACN index of the channel <n> is
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* <n> = <i> - AV_CHAN_AMBISONIC_BASE.
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*
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* @note these values are only used for AV_CHANNEL_ORDER_CUSTOM channel
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* orderings, the AV_CHANNEL_ORDER_AMBISONIC ordering orders the channels
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* implicitly by their position in the stream.
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*/
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AV_CHAN_AMBISONIC_BASE = 0x400,
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// leave space for 1024 ids, which correspond to maximum order-32 harmonics,
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// which should be enough for the foreseeable use cases
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AV_CHAN_AMBISONIC_END = 0x7ff,
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};
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enum AVChannelOrder {
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/**
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* Only the channel count is specified, without any further information
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* about the channel order.
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*/
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AV_CHANNEL_ORDER_UNSPEC,
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/**
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* The native channel order, i.e. the channels are in the same order in
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* which they are defined in the AVChannel enum. This supports up to 63
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* different channels.
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*/
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AV_CHANNEL_ORDER_NATIVE,
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/**
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* The channel order does not correspond to any other predefined order and
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* is stored as an explicit map. For example, this could be used to support
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* layouts with 64 or more channels, or with empty/skipped (AV_CHAN_SILENCE)
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* channels at arbitrary positions.
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*/
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AV_CHANNEL_ORDER_CUSTOM,
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/**
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* The audio is represented as the decomposition of the sound field into
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* spherical harmonics. Each channel corresponds to a single expansion
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* component. Channels are ordered according to ACN (Ambisonic Channel
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* Number).
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*
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* The channel with the index n in the stream contains the spherical
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* harmonic of degree l and order m given by
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* @code{.unparsed}
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* l = floor(sqrt(n)),
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* m = n - l * (l + 1).
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* @endcode
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*
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* Conversely given a spherical harmonic of degree l and order m, the
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* corresponding channel index n is given by
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* @code{.unparsed}
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* n = l * (l + 1) + m.
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* @endcode
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*
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* Normalization is assumed to be SN3D (Schmidt Semi-Normalization)
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* as defined in AmbiX format $ 2.1.
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*/
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AV_CHANNEL_ORDER_AMBISONIC,
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};
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/**
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* @defgroup channel_masks Audio channel masks
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*
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* A channel layout is a 64-bits integer with a bit set for every channel.
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* The number of bits set must be equal to the number of channels.
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* The value 0 means that the channel layout is not known.
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* @note this data structure is not powerful enough to handle channels
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* combinations that have the same channel multiple times, such as
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* dual-mono.
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*
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* @{
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*/
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#define AV_CH_FRONT_LEFT (1ULL << AV_CHAN_FRONT_LEFT )
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#define AV_CH_FRONT_RIGHT (1ULL << AV_CHAN_FRONT_RIGHT )
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#define AV_CH_FRONT_CENTER (1ULL << AV_CHAN_FRONT_CENTER )
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#define AV_CH_LOW_FREQUENCY (1ULL << AV_CHAN_LOW_FREQUENCY )
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#define AV_CH_BACK_LEFT (1ULL << AV_CHAN_BACK_LEFT )
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#define AV_CH_BACK_RIGHT (1ULL << AV_CHAN_BACK_RIGHT )
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#define AV_CH_FRONT_LEFT_OF_CENTER (1ULL << AV_CHAN_FRONT_LEFT_OF_CENTER )
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#define AV_CH_FRONT_RIGHT_OF_CENTER (1ULL << AV_CHAN_FRONT_RIGHT_OF_CENTER)
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#define AV_CH_BACK_CENTER (1ULL << AV_CHAN_BACK_CENTER )
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#define AV_CH_SIDE_LEFT (1ULL << AV_CHAN_SIDE_LEFT )
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#define AV_CH_SIDE_RIGHT (1ULL << AV_CHAN_SIDE_RIGHT )
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#define AV_CH_TOP_CENTER (1ULL << AV_CHAN_TOP_CENTER )
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#define AV_CH_TOP_FRONT_LEFT (1ULL << AV_CHAN_TOP_FRONT_LEFT )
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#define AV_CH_TOP_FRONT_CENTER (1ULL << AV_CHAN_TOP_FRONT_CENTER )
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#define AV_CH_TOP_FRONT_RIGHT (1ULL << AV_CHAN_TOP_FRONT_RIGHT )
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#define AV_CH_TOP_BACK_LEFT (1ULL << AV_CHAN_TOP_BACK_LEFT )
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#define AV_CH_TOP_BACK_CENTER (1ULL << AV_CHAN_TOP_BACK_CENTER )
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#define AV_CH_TOP_BACK_RIGHT (1ULL << AV_CHAN_TOP_BACK_RIGHT )
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#define AV_CH_STEREO_LEFT (1ULL << AV_CHAN_STEREO_LEFT )
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#define AV_CH_STEREO_RIGHT (1ULL << AV_CHAN_STEREO_RIGHT )
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#define AV_CH_WIDE_LEFT (1ULL << AV_CHAN_WIDE_LEFT )
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#define AV_CH_WIDE_RIGHT (1ULL << AV_CHAN_WIDE_RIGHT )
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#define AV_CH_SURROUND_DIRECT_LEFT (1ULL << AV_CHAN_SURROUND_DIRECT_LEFT )
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#define AV_CH_SURROUND_DIRECT_RIGHT (1ULL << AV_CHAN_SURROUND_DIRECT_RIGHT)
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#define AV_CH_LOW_FREQUENCY_2 (1ULL << AV_CHAN_LOW_FREQUENCY_2 )
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#define AV_CH_TOP_SIDE_LEFT (1ULL << AV_CHAN_TOP_SIDE_LEFT )
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#define AV_CH_TOP_SIDE_RIGHT (1ULL << AV_CHAN_TOP_SIDE_RIGHT )
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#define AV_CH_BOTTOM_FRONT_CENTER (1ULL << AV_CHAN_BOTTOM_FRONT_CENTER )
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#define AV_CH_BOTTOM_FRONT_LEFT (1ULL << AV_CHAN_BOTTOM_FRONT_LEFT )
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#define AV_CH_BOTTOM_FRONT_RIGHT (1ULL << AV_CHAN_BOTTOM_FRONT_RIGHT )
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#if FF_API_OLD_CHANNEL_LAYOUT
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/** Channel mask value used for AVCodecContext.request_channel_layout
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to indicate that the user requests the channel order of the decoder output
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to be the native codec channel order.
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@deprecated channel order is now indicated in a special field in
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AVChannelLayout
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*/
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#define AV_CH_LAYOUT_NATIVE 0x8000000000000000ULL
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#endif
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/**
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* @}
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* @defgroup channel_mask_c Audio channel layouts
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* @{
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* */
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#define AV_CH_LAYOUT_MONO (AV_CH_FRONT_CENTER)
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#define AV_CH_LAYOUT_STEREO (AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT)
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#define AV_CH_LAYOUT_2POINT1 (AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY)
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#define AV_CH_LAYOUT_2_1 (AV_CH_LAYOUT_STEREO|AV_CH_BACK_CENTER)
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#define AV_CH_LAYOUT_SURROUND (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER)
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#define AV_CH_LAYOUT_3POINT1 (AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY)
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#define AV_CH_LAYOUT_4POINT0 (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_CENTER)
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#define AV_CH_LAYOUT_4POINT1 (AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY)
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#define AV_CH_LAYOUT_2_2 (AV_CH_LAYOUT_STEREO|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT)
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#define AV_CH_LAYOUT_QUAD (AV_CH_LAYOUT_STEREO|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
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#define AV_CH_LAYOUT_5POINT0 (AV_CH_LAYOUT_SURROUND|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT)
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#define AV_CH_LAYOUT_5POINT1 (AV_CH_LAYOUT_5POINT0|AV_CH_LOW_FREQUENCY)
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#define AV_CH_LAYOUT_5POINT0_BACK (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
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#define AV_CH_LAYOUT_5POINT1_BACK (AV_CH_LAYOUT_5POINT0_BACK|AV_CH_LOW_FREQUENCY)
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#define AV_CH_LAYOUT_6POINT0 (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_CENTER)
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#define AV_CH_LAYOUT_6POINT0_FRONT (AV_CH_LAYOUT_2_2|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER)
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#define AV_CH_LAYOUT_HEXAGONAL (AV_CH_LAYOUT_5POINT0_BACK|AV_CH_BACK_CENTER)
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#define AV_CH_LAYOUT_6POINT1 (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_CENTER)
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#define AV_CH_LAYOUT_6POINT1_BACK (AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER)
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#define AV_CH_LAYOUT_6POINT1_FRONT (AV_CH_LAYOUT_6POINT0_FRONT|AV_CH_LOW_FREQUENCY)
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#define AV_CH_LAYOUT_7POINT0 (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
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#define AV_CH_LAYOUT_7POINT0_FRONT (AV_CH_LAYOUT_5POINT0|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER)
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#define AV_CH_LAYOUT_7POINT1 (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
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#define AV_CH_LAYOUT_7POINT1_WIDE (AV_CH_LAYOUT_5POINT1|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER)
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#define AV_CH_LAYOUT_7POINT1_WIDE_BACK (AV_CH_LAYOUT_5POINT1_BACK|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER)
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#define AV_CH_LAYOUT_OCTAGONAL (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_LEFT|AV_CH_BACK_CENTER|AV_CH_BACK_RIGHT)
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#define AV_CH_LAYOUT_HEXADECAGONAL (AV_CH_LAYOUT_OCTAGONAL|AV_CH_WIDE_LEFT|AV_CH_WIDE_RIGHT|AV_CH_TOP_BACK_LEFT|AV_CH_TOP_BACK_RIGHT|AV_CH_TOP_BACK_CENTER|AV_CH_TOP_FRONT_CENTER|AV_CH_TOP_FRONT_LEFT|AV_CH_TOP_FRONT_RIGHT)
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#define AV_CH_LAYOUT_STEREO_DOWNMIX (AV_CH_STEREO_LEFT|AV_CH_STEREO_RIGHT)
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#define AV_CH_LAYOUT_22POINT2 (AV_CH_LAYOUT_5POINT1_BACK|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER|AV_CH_BACK_CENTER|AV_CH_LOW_FREQUENCY_2|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT|AV_CH_TOP_FRONT_LEFT|AV_CH_TOP_FRONT_RIGHT|AV_CH_TOP_FRONT_CENTER|AV_CH_TOP_CENTER|AV_CH_TOP_BACK_LEFT|AV_CH_TOP_BACK_RIGHT|AV_CH_TOP_SIDE_LEFT|AV_CH_TOP_SIDE_RIGHT|AV_CH_TOP_BACK_CENTER|AV_CH_BOTTOM_FRONT_CENTER|AV_CH_BOTTOM_FRONT_LEFT|AV_CH_BOTTOM_FRONT_RIGHT)
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enum AVMatrixEncoding {
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AV_MATRIX_ENCODING_NONE,
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AV_MATRIX_ENCODING_DOLBY,
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AV_MATRIX_ENCODING_DPLII,
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AV_MATRIX_ENCODING_DPLIIX,
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AV_MATRIX_ENCODING_DPLIIZ,
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AV_MATRIX_ENCODING_DOLBYEX,
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AV_MATRIX_ENCODING_DOLBYHEADPHONE,
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AV_MATRIX_ENCODING_NB
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};
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/**
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* @}
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*/
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/**
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* An AVChannelCustom defines a single channel within a custom order layout
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*
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* Unlike most structures in FFmpeg, sizeof(AVChannelCustom) is a part of the
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* public ABI.
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*
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* No new fields may be added to it without a major version bump.
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*/
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typedef struct AVChannelCustom {
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enum AVChannel id;
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char name[16];
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void *opaque;
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} AVChannelCustom;
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/**
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* An AVChannelLayout holds information about the channel layout of audio data.
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*
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* A channel layout here is defined as a set of channels ordered in a specific
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* way (unless the channel order is AV_CHANNEL_ORDER_UNSPEC, in which case an
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* AVChannelLayout carries only the channel count).
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*
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* Unlike most structures in Libav, sizeof(AVChannelLayout) is a part of the
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* public ABI and may be used by the caller. E.g. it may be allocated on stack
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* or embedded in caller-defined structs.
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*
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* AVChannelLayout can be initialized as follows:
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* - default initialization with {0}, followed by setting all used fields
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* correctly;
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* - by assigning one of the predefined AV_CHANNEL_LAYOUT_* initializers;
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* - with a constructor function, such as av_channel_layout_default(),
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* av_channel_layout_from_mask() or av_channel_layout_from_string().
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*
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* The channel layout must be unitialized with av_channel_layout_uninit()
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*
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* Copying an AVChannelLayout via assigning is forbidden,
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* av_channel_layout_copy() must be used instead (and its return value should
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* be checked)
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*
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* No new fields may be added to it without a major version bump, except for
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* new elements of the union fitting in sizeof(uint64_t).
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*/
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typedef struct AVChannelLayout {
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/**
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* Channel order used in this layout.
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* This is a mandatory field.
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*/
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enum AVChannelOrder order;
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/**
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* Number of channels in this layout. Mandatory field.
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*/
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int nb_channels;
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/**
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* Details about which channels are present in this layout.
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* For AV_CHANNEL_ORDER_UNSPEC, this field is undefined and must not be
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* used.
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*/
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union {
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/**
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* This member must be used for AV_CHANNEL_ORDER_NATIVE, and may be used
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* for AV_CHANNEL_ORDER_AMBISONIC to signal non-diegetic channels.
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* It is a bitmask, where the position of each set bit means that the
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* AVChannel with the corresponding value is present.
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*
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* I.e. when (mask & (1 << AV_CHAN_FOO)) is non-zero, then AV_CHAN_FOO
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* is present in the layout. Otherwise it is not present.
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*
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* @note when a channel layout using a bitmask is constructed or
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* modified manually (i.e. not using any of the av_channel_layout_*
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* functions), the code doing it must ensure that the number of set bits
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* is equal to nb_channels.
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*/
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uint64_t mask;
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/**
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* This member must be used when the channel order is
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* AV_CHANNEL_ORDER_CUSTOM. It is a nb_channels-sized array, with each
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* element signalling the presence of the AVChannel with the
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* corresponding value in map[i].id.
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*
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* I.e. when map[i].id is equal to AV_CHAN_FOO, then AV_CH_FOO is the
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* i-th channel in the audio data.
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*
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* When map[i].id is in the range between AV_CHAN_AMBISONIC_BASE and
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* AV_CHAN_AMBISONIC_END (inclusive), the channel contains an ambisonic
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* component with ACN index (as defined above)
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* n = map[i].id - AV_CHAN_AMBISONIC_BASE.
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*
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* map[i].name may be filled with a 0-terminated string, in which case
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* it will be used for the purpose of identifying the channel with the
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* convenience functions below. Otherise it must be zeroed.
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*/
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AVChannelCustom *map;
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} u;
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/**
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* For some private data of the user.
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*/
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void *opaque;
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} AVChannelLayout;
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#define AV_CHANNEL_LAYOUT_MASK(nb, m) \
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{ .order = AV_CHANNEL_ORDER_NATIVE, .nb_channels = (nb), .u = { .mask = (m) }}
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#define AV_CHANNEL_LAYOUT_MONO AV_CHANNEL_LAYOUT_MASK(1, AV_CH_LAYOUT_MONO)
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#define AV_CHANNEL_LAYOUT_STEREO AV_CHANNEL_LAYOUT_MASK(2, AV_CH_LAYOUT_STEREO)
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#define AV_CHANNEL_LAYOUT_2POINT1 AV_CHANNEL_LAYOUT_MASK(3, AV_CH_LAYOUT_2POINT1)
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#define AV_CHANNEL_LAYOUT_2_1 AV_CHANNEL_LAYOUT_MASK(3, AV_CH_LAYOUT_2_1)
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#define AV_CHANNEL_LAYOUT_SURROUND AV_CHANNEL_LAYOUT_MASK(3, AV_CH_LAYOUT_SURROUND)
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#define AV_CHANNEL_LAYOUT_3POINT1 AV_CHANNEL_LAYOUT_MASK(4, AV_CH_LAYOUT_3POINT1)
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#define AV_CHANNEL_LAYOUT_4POINT0 AV_CHANNEL_LAYOUT_MASK(4, AV_CH_LAYOUT_4POINT0)
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#define AV_CHANNEL_LAYOUT_4POINT1 AV_CHANNEL_LAYOUT_MASK(5, AV_CH_LAYOUT_4POINT1)
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#define AV_CHANNEL_LAYOUT_2_2 AV_CHANNEL_LAYOUT_MASK(4, AV_CH_LAYOUT_2_2)
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#define AV_CHANNEL_LAYOUT_QUAD AV_CHANNEL_LAYOUT_MASK(4, AV_CH_LAYOUT_QUAD)
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#define AV_CHANNEL_LAYOUT_5POINT0 AV_CHANNEL_LAYOUT_MASK(5, AV_CH_LAYOUT_5POINT0)
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#define AV_CHANNEL_LAYOUT_5POINT1 AV_CHANNEL_LAYOUT_MASK(6, AV_CH_LAYOUT_5POINT1)
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#define AV_CHANNEL_LAYOUT_5POINT0_BACK AV_CHANNEL_LAYOUT_MASK(5, AV_CH_LAYOUT_5POINT0_BACK)
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#define AV_CHANNEL_LAYOUT_5POINT1_BACK AV_CHANNEL_LAYOUT_MASK(6, AV_CH_LAYOUT_5POINT1_BACK)
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#define AV_CHANNEL_LAYOUT_6POINT0 AV_CHANNEL_LAYOUT_MASK(6, AV_CH_LAYOUT_6POINT0)
|
|
#define AV_CHANNEL_LAYOUT_6POINT0_FRONT AV_CHANNEL_LAYOUT_MASK(6, AV_CH_LAYOUT_6POINT0_FRONT)
|
|
#define AV_CHANNEL_LAYOUT_HEXAGONAL AV_CHANNEL_LAYOUT_MASK(6, AV_CH_LAYOUT_HEXAGONAL)
|
|
#define AV_CHANNEL_LAYOUT_6POINT1 AV_CHANNEL_LAYOUT_MASK(7, AV_CH_LAYOUT_6POINT1)
|
|
#define AV_CHANNEL_LAYOUT_6POINT1_BACK AV_CHANNEL_LAYOUT_MASK(7, AV_CH_LAYOUT_6POINT1_BACK)
|
|
#define AV_CHANNEL_LAYOUT_6POINT1_FRONT AV_CHANNEL_LAYOUT_MASK(7, AV_CH_LAYOUT_6POINT1_FRONT)
|
|
#define AV_CHANNEL_LAYOUT_7POINT0 AV_CHANNEL_LAYOUT_MASK(7, AV_CH_LAYOUT_7POINT0)
|
|
#define AV_CHANNEL_LAYOUT_7POINT0_FRONT AV_CHANNEL_LAYOUT_MASK(7, AV_CH_LAYOUT_7POINT0_FRONT)
|
|
#define AV_CHANNEL_LAYOUT_7POINT1 AV_CHANNEL_LAYOUT_MASK(8, AV_CH_LAYOUT_7POINT1)
|
|
#define AV_CHANNEL_LAYOUT_7POINT1_WIDE AV_CHANNEL_LAYOUT_MASK(8, AV_CH_LAYOUT_7POINT1_WIDE)
|
|
#define AV_CHANNEL_LAYOUT_7POINT1_WIDE_BACK AV_CHANNEL_LAYOUT_MASK(8, AV_CH_LAYOUT_7POINT1_WIDE_BACK)
|
|
#define AV_CHANNEL_LAYOUT_OCTAGONAL AV_CHANNEL_LAYOUT_MASK(8, AV_CH_LAYOUT_OCTAGONAL)
|
|
#define AV_CHANNEL_LAYOUT_HEXADECAGONAL AV_CHANNEL_LAYOUT_MASK(16, AV_CH_LAYOUT_HEXADECAGONAL)
|
|
#define AV_CHANNEL_LAYOUT_STEREO_DOWNMIX AV_CHANNEL_LAYOUT_MASK(2, AV_CH_LAYOUT_STEREO_DOWNMIX)
|
|
#define AV_CHANNEL_LAYOUT_22POINT2 AV_CHANNEL_LAYOUT_MASK(24, AV_CH_LAYOUT_22POINT2)
|
|
#define AV_CHANNEL_LAYOUT_AMBISONIC_FIRST_ORDER \
|
|
{ .order = AV_CHANNEL_ORDER_AMBISONIC, .nb_channels = 4, .u = { .mask = 0 }}
|
|
|
|
struct AVBPrint;
|
|
|
|
#if FF_API_OLD_CHANNEL_LAYOUT
|
|
/**
|
|
* Return a channel layout id that matches name, or 0 if no match is found.
|
|
*
|
|
* name can be one or several of the following notations,
|
|
* separated by '+' or '|':
|
|
* - the name of an usual channel layout (mono, stereo, 4.0, quad, 5.0,
|
|
* 5.0(side), 5.1, 5.1(side), 7.1, 7.1(wide), downmix);
|
|
* - the name of a single channel (FL, FR, FC, LFE, BL, BR, FLC, FRC, BC,
|
|
* SL, SR, TC, TFL, TFC, TFR, TBL, TBC, TBR, DL, DR);
|
|
* - a number of channels, in decimal, followed by 'c', yielding
|
|
* the default channel layout for that number of channels (@see
|
|
* av_get_default_channel_layout);
|
|
* - a channel layout mask, in hexadecimal starting with "0x" (see the
|
|
* AV_CH_* macros).
|
|
*
|
|
* Example: "stereo+FC" = "2c+FC" = "2c+1c" = "0x7"
|
|
*
|
|
* @deprecated use av_channel_layout_from_string()
|
|
*/
|
|
attribute_deprecated
|
|
uint64_t av_get_channel_layout(const char *name);
|
|
|
|
/**
|
|
* Return a channel layout and the number of channels based on the specified name.
|
|
*
|
|
* This function is similar to (@see av_get_channel_layout), but can also parse
|
|
* unknown channel layout specifications.
|
|
*
|
|
* @param[in] name channel layout specification string
|
|
* @param[out] channel_layout parsed channel layout (0 if unknown)
|
|
* @param[out] nb_channels number of channels
|
|
*
|
|
* @return 0 on success, AVERROR(EINVAL) if the parsing fails.
|
|
* @deprecated use av_channel_layout_from_string()
|
|
*/
|
|
attribute_deprecated
|
|
int av_get_extended_channel_layout(const char *name, uint64_t* channel_layout, int* nb_channels);
|
|
|
|
/**
|
|
* Return a description of a channel layout.
|
|
* If nb_channels is <= 0, it is guessed from the channel_layout.
|
|
*
|
|
* @param buf put here the string containing the channel layout
|
|
* @param buf_size size in bytes of the buffer
|
|
* @deprecated use av_channel_layout_describe()
|
|
*/
|
|
attribute_deprecated
|
|
void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout);
|
|
|
|
/**
|
|
* Append a description of a channel layout to a bprint buffer.
|
|
* @deprecated use av_channel_layout_describe()
|
|
*/
|
|
attribute_deprecated
|
|
void av_bprint_channel_layout(struct AVBPrint *bp, int nb_channels, uint64_t channel_layout);
|
|
|
|
/**
|
|
* Return the number of channels in the channel layout.
|
|
* @deprecated use AVChannelLayout.nb_channels
|
|
*/
|
|
attribute_deprecated
|
|
int av_get_channel_layout_nb_channels(uint64_t channel_layout);
|
|
|
|
/**
|
|
* Return default channel layout for a given number of channels.
|
|
*
|
|
* @deprecated use av_channel_layout_default()
|
|
*/
|
|
attribute_deprecated
|
|
int64_t av_get_default_channel_layout(int nb_channels);
|
|
|
|
/**
|
|
* Get the index of a channel in channel_layout.
|
|
*
|
|
* @param channel a channel layout describing exactly one channel which must be
|
|
* present in channel_layout.
|
|
*
|
|
* @return index of channel in channel_layout on success, a negative AVERROR
|
|
* on error.
|
|
*
|
|
* @deprecated use av_channel_layout_index_from_channel()
|
|
*/
|
|
attribute_deprecated
|
|
int av_get_channel_layout_channel_index(uint64_t channel_layout,
|
|
uint64_t channel);
|
|
|
|
/**
|
|
* Get the channel with the given index in channel_layout.
|
|
* @deprecated use av_channel_layout_channel_from_index()
|
|
*/
|
|
attribute_deprecated
|
|
uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index);
|
|
|
|
/**
|
|
* Get the name of a given channel.
|
|
*
|
|
* @return channel name on success, NULL on error.
|
|
*
|
|
* @deprecated use av_channel_name()
|
|
*/
|
|
attribute_deprecated
|
|
const char *av_get_channel_name(uint64_t channel);
|
|
|
|
/**
|
|
* Get the description of a given channel.
|
|
*
|
|
* @param channel a channel layout with a single channel
|
|
* @return channel description on success, NULL on error
|
|
* @deprecated use av_channel_description()
|
|
*/
|
|
attribute_deprecated
|
|
const char *av_get_channel_description(uint64_t channel);
|
|
|
|
/**
|
|
* Get the value and name of a standard channel layout.
|
|
*
|
|
* @param[in] index index in an internal list, starting at 0
|
|
* @param[out] layout channel layout mask
|
|
* @param[out] name name of the layout
|
|
* @return 0 if the layout exists,
|
|
* <0 if index is beyond the limits
|
|
* @deprecated use av_channel_layout_standard()
|
|
*/
|
|
attribute_deprecated
|
|
int av_get_standard_channel_layout(unsigned index, uint64_t *layout,
|
|
const char **name);
|
|
#endif
|
|
|
|
/**
|
|
* Get a human readable string in an abbreviated form describing a given channel.
|
|
* This is the inverse function of @ref av_channel_from_string().
|
|
*
|
|
* @param buf pre-allocated buffer where to put the generated string
|
|
* @param buf_size size in bytes of the buffer.
|
|
* @return amount of bytes needed to hold the output string, or a negative AVERROR
|
|
* on failure. If the returned value is bigger than buf_size, then the
|
|
* string was truncated.
|
|
*/
|
|
int av_channel_name(char *buf, size_t buf_size, enum AVChannel channel);
|
|
|
|
/**
|
|
* bprint variant of av_channel_name().
|
|
*
|
|
* @note the string will be appended to the bprint buffer.
|
|
*/
|
|
void av_channel_name_bprint(struct AVBPrint *bp, enum AVChannel channel_id);
|
|
|
|
/**
|
|
* Get a human readable string describing a given channel.
|
|
*
|
|
* @param buf pre-allocated buffer where to put the generated string
|
|
* @param buf_size size in bytes of the buffer.
|
|
* @return amount of bytes needed to hold the output string, or a negative AVERROR
|
|
* on failure. If the returned value is bigger than buf_size, then the
|
|
* string was truncated.
|
|
*/
|
|
int av_channel_description(char *buf, size_t buf_size, enum AVChannel channel);
|
|
|
|
/**
|
|
* bprint variant of av_channel_description().
|
|
*
|
|
* @note the string will be appended to the bprint buffer.
|
|
*/
|
|
void av_channel_description_bprint(struct AVBPrint *bp, enum AVChannel channel_id);
|
|
|
|
/**
|
|
* This is the inverse function of @ref av_channel_name().
|
|
*
|
|
* @return the channel with the given name
|
|
* AV_CHAN_NONE when name does not identify a known channel
|
|
*/
|
|
enum AVChannel av_channel_from_string(const char *name);
|
|
|
|
/**
|
|
* Initialize a native channel layout from a bitmask indicating which channels
|
|
* are present.
|
|
*
|
|
* @param channel_layout the layout structure to be initialized
|
|
* @param mask bitmask describing the channel layout
|
|
*
|
|
* @return 0 on success
|
|
* AVERROR(EINVAL) for invalid mask values
|
|
*/
|
|
int av_channel_layout_from_mask(AVChannelLayout *channel_layout, uint64_t mask);
|
|
|
|
/**
|
|
* Initialize a channel layout from a given string description.
|
|
* The input string can be represented by:
|
|
* - the formal channel layout name (returned by av_channel_layout_describe())
|
|
* - single or multiple channel names (returned by av_channel_name(), eg. "FL",
|
|
* or concatenated with "+", each optionally containing a custom name after
|
|
* a "@", eg. "FL@Left+FR@Right+LFE")
|
|
* - a decimal or hexadecimal value of a native channel layout (eg. "4" or "0x4")
|
|
* - the number of channels with default layout (eg. "4c")
|
|
* - the number of unordered channels (eg. "4C" or "4 channels")
|
|
* - the ambisonic order followed by optional non-diegetic channels (eg.
|
|
* "ambisonic 2+stereo")
|
|
*
|
|
* @param channel_layout input channel layout
|
|
* @param str string describing the channel layout
|
|
* @return 0 channel layout was detected, AVERROR_INVALIDATATA otherwise
|
|
*/
|
|
int av_channel_layout_from_string(AVChannelLayout *channel_layout,
|
|
const char *str);
|
|
|
|
/**
|
|
* Get the default channel layout for a given number of channels.
|
|
*
|
|
* @param channel_layout the layout structure to be initialized
|
|
* @param nb_channels number of channels
|
|
*/
|
|
void av_channel_layout_default(AVChannelLayout *ch_layout, int nb_channels);
|
|
|
|
/**
|
|
* Iterate over all standard channel layouts.
|
|
*
|
|
* @param opaque a pointer where libavutil will store the iteration state. Must
|
|
* point to NULL to start the iteration.
|
|
*
|
|
* @return the standard channel layout or NULL when the iteration is
|
|
* finished
|
|
*/
|
|
const AVChannelLayout *av_channel_layout_standard(void **opaque);
|
|
|
|
/**
|
|
* Free any allocated data in the channel layout and reset the channel
|
|
* count to 0.
|
|
*
|
|
* @param channel_layout the layout structure to be uninitialized
|
|
*/
|
|
void av_channel_layout_uninit(AVChannelLayout *channel_layout);
|
|
|
|
/**
|
|
* Make a copy of a channel layout. This differs from just assigning src to dst
|
|
* in that it allocates and copies the map for AV_CHANNEL_ORDER_CUSTOM.
|
|
*
|
|
* @note the destination channel_layout will be always uninitialized before copy.
|
|
*
|
|
* @param dst destination channel layout
|
|
* @param src source channel layout
|
|
* @return 0 on success, a negative AVERROR on error.
|
|
*/
|
|
int av_channel_layout_copy(AVChannelLayout *dst, const AVChannelLayout *src);
|
|
|
|
/**
|
|
* Get a human-readable string describing the channel layout properties.
|
|
* The string will be in the same format that is accepted by
|
|
* @ref av_channel_layout_from_string(), allowing to rebuild the same
|
|
* channel layout, except for opaque pointers.
|
|
*
|
|
* @param channel_layout channel layout to be described
|
|
* @param buf pre-allocated buffer where to put the generated string
|
|
* @param buf_size size in bytes of the buffer.
|
|
* @return amount of bytes needed to hold the output string, or a negative AVERROR
|
|
* on failure. If the returned value is bigger than buf_size, then the
|
|
* string was truncated.
|
|
*/
|
|
int av_channel_layout_describe(const AVChannelLayout *channel_layout,
|
|
char *buf, size_t buf_size);
|
|
|
|
/**
|
|
* bprint variant of av_channel_layout_describe().
|
|
*
|
|
* @note the string will be appended to the bprint buffer.
|
|
* @return 0 on success, or a negative AVERROR value on failure.
|
|
*/
|
|
int av_channel_layout_describe_bprint(const AVChannelLayout *channel_layout,
|
|
struct AVBPrint *bp);
|
|
|
|
/**
|
|
* Get the channel with the given index in a channel layout.
|
|
*
|
|
* @param channel_layout input channel layout
|
|
* @return channel with the index idx in channel_layout on success or
|
|
* AV_CHAN_NONE on failure (if idx is not valid or the channel order is
|
|
* unspecified)
|
|
*/
|
|
enum AVChannel
|
|
av_channel_layout_channel_from_index(const AVChannelLayout *channel_layout, unsigned int idx);
|
|
|
|
/**
|
|
* Get the index of a given channel in a channel layout. In case multiple
|
|
* channels are found, only the first match will be returned.
|
|
*
|
|
* @param channel_layout input channel layout
|
|
* @return index of channel in channel_layout on success or a negative number if
|
|
* channel is not present in channel_layout.
|
|
*/
|
|
int av_channel_layout_index_from_channel(const AVChannelLayout *channel_layout,
|
|
enum AVChannel channel);
|
|
|
|
/**
|
|
* Get the index in a channel layout of a channel described by the given string.
|
|
* In case multiple channels are found, only the first match will be returned.
|
|
*
|
|
* This function accepts channel names in the same format as
|
|
* @ref av_channel_from_string().
|
|
*
|
|
* @param channel_layout input channel layout
|
|
* @return a channel index described by the given string, or a negative AVERROR
|
|
* value.
|
|
*/
|
|
int av_channel_layout_index_from_string(const AVChannelLayout *channel_layout,
|
|
const char *name);
|
|
|
|
/**
|
|
* Get a channel described by the given string.
|
|
*
|
|
* This function accepts channel names in the same format as
|
|
* @ref av_channel_from_string().
|
|
*
|
|
* @param channel_layout input channel layout
|
|
* @return a channel described by the given string in channel_layout on success
|
|
* or AV_CHAN_NONE on failure (if the string is not valid or the channel
|
|
* order is unspecified)
|
|
*/
|
|
enum AVChannel
|
|
av_channel_layout_channel_from_string(const AVChannelLayout *channel_layout,
|
|
const char *name);
|
|
|
|
/**
|
|
* Find out what channels from a given set are present in a channel layout,
|
|
* without regard for their positions.
|
|
*
|
|
* @param channel_layout input channel layout
|
|
* @param mask a combination of AV_CH_* representing a set of channels
|
|
* @return a bitfield representing all the channels from mask that are present
|
|
* in channel_layout
|
|
*/
|
|
uint64_t av_channel_layout_subset(const AVChannelLayout *channel_layout,
|
|
uint64_t mask);
|
|
|
|
/**
|
|
* Check whether a channel layout is valid, i.e. can possibly describe audio
|
|
* data.
|
|
*
|
|
* @param channel_layout input channel layout
|
|
* @return 1 if channel_layout is valid, 0 otherwise.
|
|
*/
|
|
int av_channel_layout_check(const AVChannelLayout *channel_layout);
|
|
|
|
/**
|
|
* Check whether two channel layouts are semantically the same, i.e. the same
|
|
* channels are present on the same positions in both.
|
|
*
|
|
* If one of the channel layouts is AV_CHANNEL_ORDER_UNSPEC, while the other is
|
|
* not, they are considered to be unequal. If both are AV_CHANNEL_ORDER_UNSPEC,
|
|
* they are considered equal iff the channel counts are the same in both.
|
|
*
|
|
* @param chl input channel layout
|
|
* @param chl1 input channel layout
|
|
* @return 0 if chl and chl1 are equal, 1 if they are not equal. A negative
|
|
* AVERROR code if one or both are invalid.
|
|
*/
|
|
int av_channel_layout_compare(const AVChannelLayout *chl, const AVChannelLayout *chl1);
|
|
|
|
/**
|
|
* @}
|
|
* @}
|
|
*/
|
|
|
|
#endif /* AVUTIL_CHANNEL_LAYOUT_H */
|