/usr/include/gstreamer-1.0/gst/audio/audio.h is in libgstreamer-plugins-base1.0-dev 1.2.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 | /* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 * Library       <2001> Thomas Vander Stichele <thomas@apestaart.org>
 *               <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_AUDIO_H__
#define __GST_AUDIO_AUDIO_H__
#include <gst/gst.h>
#include <gst/audio/audio-enumtypes.h>
#include <gst/audio/audio-format.h>
#include <gst/audio/audio-channels.h>
#include <gst/audio/audio-info.h>
G_BEGIN_DECLS
/* conversion macros */
/**
 * GST_FRAMES_TO_CLOCK_TIME:
 * @frames: sample frames
 * @rate: sampling rate
 *
 * Calculate clocktime from sample @frames and @rate.
 */
#define GST_FRAMES_TO_CLOCK_TIME(frames, rate) \
  ((GstClockTime) gst_util_uint64_scale_round (frames, GST_SECOND, rate))
/**
 * GST_CLOCK_TIME_TO_FRAMES:
 * @clocktime: clock time
 * @rate: sampling rate
 *
 * Calculate frames from @clocktime and sample @rate.
 */
#define GST_CLOCK_TIME_TO_FRAMES(clocktime, rate) \
  gst_util_uint64_scale_round (clocktime, rate, GST_SECOND)
/* metadata macros */
/**
 * GST_META_TAG_AUDIO_STR:
 *
 * This metadata is relevant for audio streams.
 *
 * Since: 1.2
 */
#define GST_META_TAG_AUDIO_STR "audio"
/**
 * GST_META_TAG_AUDIO_CHANNELS_STR:
 *
 * This metadata stays relevant as long as channels are unchanged.
 *
 * Since: 1.2
 */
#define GST_META_TAG_AUDIO_CHANNELS_STR "channels"
/*
 * this library defines and implements some helper functions for audio
 * handling
 */
GstBuffer *    gst_audio_buffer_clip     (GstBuffer *buffer, GstSegment *segment,
                                          gint rate, gint bpf);
G_END_DECLS
#include <gst/audio/gstaudioringbuffer.h>
#include <gst/audio/gstaudioclock.h>
#include <gst/audio/gstaudiofilter.h>
#include <gst/audio/gstaudiocdsrc.h>
#include <gst/audio/gstaudiodecoder.h>
#include <gst/audio/gstaudioencoder.h>
#include <gst/audio/gstaudiobasesink.h>
#include <gst/audio/gstaudiobasesrc.h>
#include <gst/audio/gstaudiometa.h>
#include <gst/audio/gstaudiosink.h>
#include <gst/audio/gstaudiosrc.h>
#include <gst/audio/streamvolume.h>
#include <gst/audio/gstaudioiec61937.h>
#endif /* __GST_AUDIO_AUDIO_H__ */
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