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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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8c5a8f4466
Related to: https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/issues/972 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3901>
338 lines
12 KiB
C
338 lines
12 KiB
C
/* GStreamer
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* Copyright (C) 2023 Carlos Rafael Giani <crg7475@mailbox.org>
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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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#pragma once
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#include <gst/gst.h>
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#include <gst/audio/audio.h>
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#include <gst/audio/gstdsdformat.h>
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G_BEGIN_DECLS
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/**
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* GST_DSD_MEDIA_TYPE:
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*
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* The GStreamer media type for DSD.
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*
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* Since: 1.24
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*/
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#define GST_DSD_MEDIA_TYPE "audio/x-dsd"
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/**
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* GST_DSD_CAPS_MAKE:
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* @format: string format that describes the DSD bits grouping,
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* as string (e.g. "DSDU32BE", "DSDU8", etc.)
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*
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* Generic caps string for DSD audio, for use in pad templates.
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*
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* Since: 1.24
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*/
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#define GST_DSD_CAPS_MAKE(format) \
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GST_DSD_MEDIA_TYPE ", " \
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"format = (string) " format ", " \
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"rate = " GST_AUDIO_RATE_RANGE ", " \
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"layout = (string) { interleaved, non-interleaved }, " \
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"reversed-bytes = (gboolean) { false, true }, " \
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"channels = " GST_AUDIO_CHANNELS_RANGE
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/**
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* GST_DSD_MAKE_DSD_RATE_44x:
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*
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* Calculates a valid DSD-44x rate (in bytes) from commonly used rate
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* multiplier specifications like DSD64, DSD128 etc.
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*
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* For example, to get the rate for DSD64-44x, use 64 as the multiplier
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* argument.
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*
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* Since: 1.24
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*/
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#define GST_DSD_MAKE_DSD_RATE_44x(multiplier) \
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((gint) ((gint64) multiplier) * 44100 / 8)
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/**
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* GST_DSD_MAKE_DSD_RATE_48x:
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*
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* Calculates a valid DSD-48x rate (in bytes) from commonly used rate
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* multiplier specifications like DSD64, DSD128 etc.
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*
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* For example, to get the rate for DSD64-48x, use 64 as the multiplier
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* argument.
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*
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* Since: 1.24
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*/
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#define GST_DSD_MAKE_DSD_RATE_48x(multiplier) \
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((gint) ((gint64) multiplier) * 48000 / 8)
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/**
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* GST_DSD_SILENCE_PATTERN_BYTE:
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*
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* Silence pattern for DSD data.
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*
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* In DSD, a nullbyte does not correspond to silence. To fill memory regions
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* with "DSD silence", these regions must be filled with byte 0x69 instead
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* (this is the DSD silence pattern). This constant provides that pattern
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* in a more readable fashion.
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*
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* Since: 1.24
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*/
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#define GST_DSD_SILENCE_PATTERN_BYTE (0x69)
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typedef struct _GstDsdInfo GstDsdInfo;
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/**
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* GstDsdInfo:
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* @format: DSD grouping format
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* @rate: DSD rate
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* @channels: number of channels (must be at least 1)
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* @layout: audio layout
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* @reversed_bytes: true if the DSD bits in the data bytes are reversed,
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* that is, the least significant bit comes first
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* @positions: positions for each channel
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*
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* Information describing DSD audio properties.
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*
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* In DSD, the "sample format" is the bit. Unlike PCM, there are no further
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* "sample formats" in DSD. However, in software, DSD bits are grouped into
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* bytes (since dealing with individual bits is impractical), and these bytes
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* in turn are grouped into words. This becomes relevant when interleaving
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* channels and transmitting DSD data through audio APIs. The different
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* types of grouping DSD bytes are referred to as the "DSD grouping forma"
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* or just "DSD format". #GstDsdFormat has a list of valid ways of grouping
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* DSD bytes into words.
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*
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* DSD rates are equivalent to PCM sample rates, except that they specify
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* how many DSD bytes are consumed per second. This refers to the bytes per
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* second _per channel_; the rate does not change when the number of channel
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* changes. (Strictly speaking, it would be more correct to measure the
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* *bits* per second, since the bit is the DSD "sample format", but it is
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* more practical to use bytes.) In DSD, bit rates are always an integer
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* multiple of the CD audio rate (44100) or the DAT rate (48000). DSD64-44x
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* is 44100 * 64 = 2822400 bits per second, or 352800 bytes per second
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* (the latter would be used in this info structure). DSD64-48x is
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* 48000 * 64 = 3072000 bits per second, or 384000 bytes per second.
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* #GST_DSD_MAKE_DSD_RATE_44x can be used for specifying DSD-44x rates,
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* *and #GST_DSD_MAKE_DSD_RATE_48x can be used for specifying DSD-48x ones.
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* Also, since DSD-48x is less well known, when the multiplier is given
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* without the 44x/48x specifier, 44x is typically implied.
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*
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* It is important to know that in DSD, different format widths correspond
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* to different playtimes. That is, a word with 32 DSD bits covers two times
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* as much playtime as a word with 16 DSD bits. This is in contrast to PCM,
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* where one word (= one PCM sample) always covers a time period of 1/samplerate,
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* no matter how many bits a PCM sample is made of. For this reason, DSD
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* and PCM widths and strides cannot be used the same way.
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*
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* Multiple channels are arranged in DSD data either interleaved or non-
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* interleaved. This is similar to PCM. Interleaved layouts rotate between
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* channels and words. First, word 0 of channel 0 is present. Then word
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* 0 of channel 1 follows. Then word 0 of channel 2 etc. until all
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* channels are through, then comes word 1 of channel 0 etc.
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*
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* Non-interleaved data is planar. First, all words of channel 0 are
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* present, then all words of channel 1 etc. Unlike interleaved data,
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* non-interleaved data can be sparse, that is, there can be space in
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* between the planes. the @positions array specifies the plane offsets.
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*
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* In uncommon cases, the DSD bits in the data bytes can be stored in reverse
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* order. For example, normally, in DSDU8, the first byte contains DSD bits
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* 0 to 7, and the most significant bit of that byte is DSD bit 0. If this
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* order is reversed, then bit 7 is the first one instead. In that ase,
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* @reversed_bytes is set to TRUE.
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*
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* Use the provided macros to access the info in this structure.
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*
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* Since: 1.24
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*/
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struct _GstDsdInfo {
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GstDsdFormat format;
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gint rate;
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gint channels;
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GstAudioLayout layout;
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gboolean reversed_bytes;
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GstAudioChannelPosition positions[64];
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GstAudioFlags flags;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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#define GST_TYPE_DSD_INFO (gst_dsd_info_get_type ())
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GST_AUDIO_API
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GType gst_dsd_info_get_type (void);
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#define GST_DSD_INFO_IS_VALID(i) ((i)->format < GST_NUM_DSD_FORMATS && (i)->rate > 0 && (i)->channels > 0)
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#define GST_DSD_INFO_FORMAT(info) ((info)->format)
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#define GST_DSD_INFO_RATE(info) ((info)->rate)
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#define GST_DSD_INFO_CHANNELS(info) ((info)->channels)
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#define GST_DSD_INFO_LAYOUT(info) ((info)->layout)
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#define GST_DSD_INFO_REVERSED_BYTES(info) ((info)->reversed_bytes)
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#define GST_DSD_INFO_POSITION(info,c) ((info)->position[c])
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/**
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* GST_DSD_INFO_STRIDE:
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*
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* Calculates the stride for a given #GstDsdInfo.
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*
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* Note that this is only useful if the info's audio layout
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* is GST_AUDIO_LAYOUT_INTERLEAVED.
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*
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* Since: 1.24
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*/
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#define GST_DSD_INFO_STRIDE(info) (gst_dsd_format_get_width((info)->format) * (info)->channels)
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/*** GstDsdPlaneOffsetMeta ***/
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#define GST_DSD_PLANE_OFFSET_META_API_TYPE (gst_dsd_plane_offset_meta_api_get_type())
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#define GST_DSD_PLANE_OFFSET_META_INFO (gst_dsd_plane_offset_meta_get_info())
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/**
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* GST_META_TAG_DSD_PLANE_OFFSETS_STR:
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*
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* This metadata stays relevant as long as the DSD plane offsets are unchanged.
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*
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* Since: 1.24
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*/
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#define GST_META_TAG_DSD_PLANE_OFFSETS_STR "dsdplaneoffsets"
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typedef struct _GstDsdPlaneOffsetMeta GstDsdPlaneOffsetMeta;
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/**
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* GstDsdPlaneOffsetMeta:
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* @meta: parent #GstMeta
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* @num_channels: number of channels in the DSD data
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* @num_bytes_per_channel: the number of valid bytes per channel in the buffer
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* @offsets: the offsets (in bytes) where each channel plane starts in the buffer
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*
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* Buffer metadata describing planar DSD contents in the buffer. This is not needed
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* for interleaved DSD data, and is required for non-interleaved (= planar) data.
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*
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* The different channels in @offsets are always in the GStreamer channel order.
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* Zero-copy channel reordering can be implemented by swapping the values in
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* @offsets.
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*
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* It is not allowed for channels to overlap in memory,
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* i.e. for each i in [0, channels), the range
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* [@offsets[i], @offsets[i] + @num_bytes_per_channel) must not overlap
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* with any other such range.
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*
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* It is, however, allowed to have parts of the buffer memory unused, by using
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* @offsets and @num_bytes_per_channel in such a way that leave gaps on it.
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* This is used to implement zero-copy clipping in non-interleaved buffers.
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*
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* Obviously, due to the above, it is not safe to infer the
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* number of valid bytes from the size of the buffer. You should always
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* use the @num_bytes_per_channel variable of this metadata.
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*
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* Since: 1.24
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*/
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struct _GstDsdPlaneOffsetMeta {
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GstMeta meta;
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gint num_channels;
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gsize num_bytes_per_channel;
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gsize *offsets;
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/*< private >*/
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gsize priv_offsets_arr[8];
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gpointer _gst_reserved[GST_PADDING];
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};
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GST_AUDIO_API
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GType gst_dsd_plane_offset_meta_api_get_type (void);
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GST_AUDIO_API
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const GstMetaInfo * gst_dsd_plane_offset_meta_get_info (void);
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#define gst_buffer_get_dsd_plane_offset_meta(b) \
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((GstDsdPlaneOffsetMeta*)gst_buffer_get_meta((b), GST_DSD_PLANE_OFFSET_META_API_TYPE))
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GST_AUDIO_API
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GstDsdPlaneOffsetMeta * gst_buffer_add_dsd_plane_offset_meta (GstBuffer *buffer,
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gint num_channels,
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gsize num_bytes_per_channel,
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gsize offsets[]);
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GST_AUDIO_API
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GstDsdInfo * gst_dsd_info_new (void);
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GST_AUDIO_API
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GstDsdInfo * gst_dsd_info_new_from_caps (const GstCaps * caps);
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GST_AUDIO_API
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void gst_dsd_info_init (GstDsdInfo * info);
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GST_AUDIO_API
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void gst_dsd_info_set_format (GstDsdInfo * info,
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GstDsdFormat format,
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gint rate,
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gint channels,
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const GstAudioChannelPosition * positions);
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GST_AUDIO_API
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GstDsdInfo * gst_dsd_info_copy (const GstDsdInfo * info);
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GST_AUDIO_API
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void gst_dsd_info_free (GstDsdInfo * info);
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GST_AUDIO_API
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gboolean gst_dsd_info_from_caps (GstDsdInfo *info,
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const GstCaps *caps);
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GST_AUDIO_API
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GstCaps * gst_dsd_info_to_caps (const GstDsdInfo *info);
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GST_AUDIO_API
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gboolean gst_dsd_info_is_equal (const GstDsdInfo *info,
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const GstDsdInfo *other);
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GST_AUDIO_API
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void gst_dsd_convert (const guint8 *input_data,
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guint8 *output_data,
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GstDsdFormat input_format,
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GstDsdFormat output_format,
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GstAudioLayout input_layout,
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GstAudioLayout output_layout,
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const gsize *input_plane_offsets,
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const gsize *output_plane_offsets,
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gsize num_dsd_bytes,
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gint num_channels,
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gboolean reverse_bytes);
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/**
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* gst_dsd_format_is_le:
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* @format: The format.
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*
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* Useful for determining whether a format is a little-endian.
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* GST_DSD_FORMAT_U8 and GST_DSD_FORMAT_UNKNOWN
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* are not considered little-endian.
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*
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* Returns: TRUE if the format is a little-endian one.
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*/
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static inline gboolean
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gst_dsd_format_is_le (GstDsdFormat format)
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{
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switch (format) {
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case GST_DSD_FORMAT_U16LE:
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case GST_DSD_FORMAT_U32LE:
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return TRUE;
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default:
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return FALSE;
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}
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}
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G_END_DECLS
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