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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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e9802f5f41
Adds the `atenc` element capable of encoding AAC-LC audio, using the AudioToolbox framework. It's able to encode up to 7.1 channel configurations. Comes with basic knobs for rate control (bitrate for CBR, quality for VBR). Support for more profiles (LD, HE-AAC) should be simple, but is not included here because of bugs with parsing of the AudioSpecificConfig. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6254>
91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
/*
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* Copyright (C) 2024 Piotr Brzeziński <piotr@centricular.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_ATENC_H_
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#define _GST_ATENC_H_
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#include <AudioToolbox/AudioToolbox.h>
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#include <gst/gst.h>
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#include <gst/audio/gstaudioencoder.h>
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#include <gst/pbutils/codec-utils.h>
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#include <gst/base/gstbytereader.h>
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#include <gst/base/gstqueuearray.h>
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#include "gstosxcoreaudiocommon.h"
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G_BEGIN_DECLS
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#define GST_TYPE_ATENC (gst_atenc_get_type())
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#define GST_ATENC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ATENC,GstATEnc))
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#define GST_ATENC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ATENC,GstATEncClass))
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#define GST_IS_ATENC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ATENC))
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#define GST_IS_ATENC_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ATENC))
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typedef struct _GstATEnc GstATEnc;
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typedef struct _GstATEncClass GstATEncClass;
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/**
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* GstATEncRateControl:
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* @GST_ATENC_RATE_CONTROL_CONSTANT: Constant bitrate
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* @GST_ATENC_RATE_CONTROL_LONG_TERM_AVERAGE: Long-term-average bitrate
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* @GST_ATENC_RATE_CONTROL_VARIABLE_CONSTRAINED: Variable constrained bitrate
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* @GST_ATENC_RATE_CONTROL_VARIABLE: Variable bitrate
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*
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* Since: 1.26
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*/
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typedef enum
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{
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GST_ATENC_RATE_CONTROL_CONSTANT = 0,
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GST_ATENC_RATE_CONTROL_LONG_TERM_AVERAGE = 1,
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GST_ATENC_RATE_CONTROL_VARIABLE_CONSTRAINED = 2,
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GST_ATENC_RATE_CONTROL_VARIABLE = 3,
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} GstATEncRateControl;
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typedef struct
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{
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gint channels;
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AudioChannelLayoutTag aac_tag;
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GstAudioChannelPosition positions[8];
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} GstATEncLayout;
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struct _GstATEnc
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{
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GstAudioEncoder encoder;
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AudioConverterRef converter;
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UInt32 max_output_buffer_size;
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UInt32 n_output_samples;
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GstQueueArray *input_queue;
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GstAudioBuffer *used_buffer;
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gboolean input_eos;
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GstATEncRateControl rate_control;
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guint32 bitrate;
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guint32 vbr_quality;
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};
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struct _GstATEncClass
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{
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GstAudioEncoderClass encoder_class;
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};
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GType gst_atenc_get_type (void);
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GST_ELEMENT_REGISTER_DECLARE (atenc);
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G_END_DECLS
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#endif
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