mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-03 16:09:39 +00:00
78 lines
3.2 KiB
C
78 lines
3.2 KiB
C
/* GStreamer
|
|
* Copyright (C) <2011> Wim Taymans <wim.taymans@gmail.com>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef __GST_AUDIO_META_H__
|
|
#define __GST_AUDIO_META_H__
|
|
|
|
#include <gst/gst.h>
|
|
|
|
#include <gst/audio/audio.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
#define GST_AUDIO_DOWNMIX_META_API_TYPE (gst_audio_downmix_meta_api_get_type())
|
|
#define GST_AUDIO_DOWNMIX_META_INFO (gst_audio_downmix_meta_get_info())
|
|
|
|
typedef struct _GstAudioDownmixMeta GstAudioDownmixMeta;
|
|
|
|
/**
|
|
* GstAudioDownmixMeta:
|
|
* @meta: parent #GstMeta
|
|
* @from_position: the channel positions of the source
|
|
* @to_position: the channel positions of the destination
|
|
* @from_channels: the number of channels of the source
|
|
* @to_channels: the number of channels of the destination
|
|
* @matrix: the matrix coefficients.
|
|
*
|
|
* Extra buffer metadata describing audio downmixing matrix. This metadata is
|
|
* attached to audio buffers and contains a matrix to downmix the buffer number
|
|
* of channels to @channels.
|
|
*
|
|
* @matrix is an two-dimensional array of @to_channels times @from_channels
|
|
* coefficients, i.e. the i-th output channels is constructed by multiplicating
|
|
* the input channels with the coefficients in @matrix[i] and taking the sum
|
|
* of the results.
|
|
*/
|
|
struct _GstAudioDownmixMeta {
|
|
GstMeta meta;
|
|
|
|
GstAudioChannelPosition *from_position;
|
|
GstAudioChannelPosition *to_position;
|
|
gint from_channels, to_channels;
|
|
gfloat **matrix;
|
|
};
|
|
|
|
GType gst_audio_downmix_meta_api_get_type (void);
|
|
const GstMetaInfo * gst_audio_downmix_meta_get_info (void);
|
|
|
|
#define gst_buffer_get_audio_downmix_meta(b) ((GstAudioDownmixMeta*)gst_buffer_get_meta((b),GST_AUDIO_DOWNMIX_META_INFO))
|
|
GstAudioDownmixMeta * gst_buffer_get_audio_downmix_meta_for_channels (GstBuffer *buffer,
|
|
const GstAudioChannelPosition *to_position,
|
|
gint to_channels);
|
|
|
|
GstAudioDownmixMeta * gst_buffer_add_audio_downmix_meta (GstBuffer *buffer,
|
|
const GstAudioChannelPosition *from_position,
|
|
gint from_channels,
|
|
const GstAudioChannelPosition *to_position,
|
|
gint to_channels,
|
|
const gfloat **matrix);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_AUDIO_META_H__ */
|