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166 lines
8.1 KiB
C
166 lines
8.1 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Library <2001> Thomas Vander Stichele <thomas@apestaart.org>
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* <2011> Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_AUDIO_CHANNELS_H__
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#define __GST_AUDIO_CHANNELS_H__
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#include <gst/gst.h>
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#include <gst/audio/audio-format.h>
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G_BEGIN_DECLS
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/**
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* GstAudioChannelPosition:
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* @GST_AUDIO_CHANNEL_POSITION_MONO: Mono without direction;
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* can only be used with 1 channel
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* @GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT: Front left
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* @GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT: Front right
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* @GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER: Front center
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* @GST_AUDIO_CHANNEL_POSITION_LFE1: Low-frequency effects 1 (subwoofer)
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* @GST_AUDIO_CHANNEL_POSITION_REAR_LEFT: Rear left
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* @GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT: Rear right
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* @GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER: Front left of center
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* @GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER: Front right of center
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* @GST_AUDIO_CHANNEL_POSITION_REAR_CENTER: Rear center
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* @GST_AUDIO_CHANNEL_POSITION_LFE2: Low-frequency effects 2 (subwoofer)
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* @GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT: Side left
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* @GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT: Side right
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* @GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_LEFT: Top front left
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* @GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_RIGHT: Top front right
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* @GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_CENTER: Top front center
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* @GST_AUDIO_CHANNEL_POSITION_TOP_CENTER: Top center
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* @GST_AUDIO_CHANNEL_POSITION_TOP_REAR_LEFT: Top rear left
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* @GST_AUDIO_CHANNEL_POSITION_TOP_REAR_RIGHT: Top rear right
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* @GST_AUDIO_CHANNEL_POSITION_TOP_SIDE_LEFT: Top side right
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* @GST_AUDIO_CHANNEL_POSITION_TOP_SIDE_RIGHT: Top rear right
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* @GST_AUDIO_CHANNEL_POSITION_TOP_REAR_CENTER: Top rear center
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* @GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_CENTER: Bottom front center
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* @GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_LEFT: Bottom front left
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* @GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_RIGHT: Bottom front right
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* @GST_AUDIO_CHANNEL_POSITION_WIDE_LEFT: Wide left (between front left and side left)
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* @GST_AUDIO_CHANNEL_POSITION_WIDE_RIGHT: Wide right (between front right and side right)
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* @GST_AUDIO_CHANNEL_POSITION_SURROUND_LEFT: Surround left (between rear left and side left)
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* @GST_AUDIO_CHANNEL_POSITION_SURROUND_RIGHT: Surround right (between rear right and side right)
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* @GST_AUDIO_CHANNEL_POSITION_NONE: used for position-less channels, e.g.
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* from a sound card that records 1024 channels; mutually exclusive with
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* any other channel position
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* @GST_AUDIO_CHANNEL_POSITION_INVALID: invalid position
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*
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* Audio channel positions.
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*
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* These are the channels defined in SMPTE 2036-2-2008
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* Table 1 for 22.2 audio systems with the Surround and Wide channels from
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* DTS Coherent Acoustics (v.1.3.1) and 10.2 and 7.1 layouts. In the caps the
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* actual channel layout is expressed with a channel count and a channel mask,
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* which describes the existing channels. The positions in the bit mask correspond
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* to the enum values.
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* For negotiation it is allowed to have more bits set in the channel mask than
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* the number of channels to specify the allowed channel positions but this is
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* not allowed in negotiated caps. It is not allowed in any situation other
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* than the one mentioned below to have less bits set in the channel mask than
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* the number of channels.
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*
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* @GST_AUDIO_CHANNEL_POSITION_MONO can only be used with a single mono channel that
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* has no direction information and would be mixed into all directional channels.
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* This is expressed in caps by having a single channel and no channel mask.
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*
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* @GST_AUDIO_CHANNEL_POSITION_NONE can only be used if all channels have this position.
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* This is expressed in caps by having a channel mask with no bits set.
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*
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* As another special case it is allowed to have two channels without a channel mask.
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* This implicitely means that this is a stereo stream with a front left and front right
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* channel.
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*/
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typedef enum {
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/* These get negative indices to allow to use
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* the enum values of the normal cases for the
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* bit-mask position */
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GST_AUDIO_CHANNEL_POSITION_NONE = -3,
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GST_AUDIO_CHANNEL_POSITION_MONO = -2,
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GST_AUDIO_CHANNEL_POSITION_INVALID = -1,
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/* Normal cases */
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT = 0,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
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GST_AUDIO_CHANNEL_POSITION_LFE1,
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GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
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GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER,
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GST_AUDIO_CHANNEL_POSITION_REAR_CENTER,
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GST_AUDIO_CHANNEL_POSITION_LFE2,
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GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_CENTER,
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GST_AUDIO_CHANNEL_POSITION_TOP_CENTER,
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GST_AUDIO_CHANNEL_POSITION_TOP_REAR_LEFT,
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GST_AUDIO_CHANNEL_POSITION_TOP_REAR_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_TOP_SIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_TOP_SIDE_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_TOP_REAR_CENTER,
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GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_CENTER,
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GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_WIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_WIDE_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_SURROUND_LEFT,
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GST_AUDIO_CHANNEL_POSITION_SURROUND_RIGHT
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} GstAudioChannelPosition;
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#define GST_AUDIO_CHANNEL_POSITION_MASK(pos) (G_GUINT64_CONSTANT(1)<< GST_AUDIO_CHANNEL_POSITION_ ## pos)
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gboolean gst_audio_buffer_reorder_channels (GstBuffer * buffer,
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GstAudioFormat format,
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gint channels,
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const GstAudioChannelPosition * from,
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const GstAudioChannelPosition * to);
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gboolean gst_audio_reorder_channels (gpointer data, gsize size,
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GstAudioFormat format,
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gint channels,
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const GstAudioChannelPosition * from,
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const GstAudioChannelPosition * to);
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gboolean gst_audio_channel_positions_to_valid_order (GstAudioChannelPosition *position,
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gint channels);
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gboolean gst_audio_check_valid_channel_positions (const GstAudioChannelPosition *position,
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gint channels, gboolean force_order);
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gboolean gst_audio_channel_positions_to_mask (const GstAudioChannelPosition *position,
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gint channels, gboolean force_order,
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guint64 *channel_mask);
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gboolean gst_audio_channel_positions_from_mask (gint channels, guint64 channel_mask,
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GstAudioChannelPosition * position);
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gboolean gst_audio_get_channel_reorder_map (gint channels,
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const GstAudioChannelPosition * from,
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const GstAudioChannelPosition * to,
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gint *reorder_map);
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G_END_DECLS
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#endif /* __GST_AUDIO_CHANNELS_H__ */
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