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389 lines
13 KiB
C
389 lines
13 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <gst/gst.h>
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#ifndef __GST_AUDIO_AUDIO_H__
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#define __GST_AUDIO_AUDIO_H__
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#include <gst/audio/multichannel.h>
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G_BEGIN_DECLS
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/**
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* GstAudioFormat:
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* @GST_AUDIO_FORMAT_UNKNOWN: unknown audio format
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* @GST_AUDIO_FORMAT_S8: sample
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* @GST_AUDIO_FORMAT_U8: sample
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* @GST_AUDIO_FORMAT_S16_LE: sample
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* @GST_AUDIO_FORMAT_S16_BE: sample
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* @GST_AUDIO_FORMAT_U16_LE: sample
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* @GST_AUDIO_FORMAT_U16_BE: sample
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* @GST_AUDIO_FORMAT_S24_LE: sample
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* @GST_AUDIO_FORMAT_S24_BE: sample
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* @GST_AUDIO_FORMAT_U24_LE: sample
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* @GST_AUDIO_FORMAT_U24_BE: sample
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* @GST_AUDIO_FORMAT_S32_LE: sample
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* @GST_AUDIO_FORMAT_S32_BE: sample
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* @GST_AUDIO_FORMAT_U32_LE: sample
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* @GST_AUDIO_FORMAT_U32_BE: sample
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* @GST_AUDIO_FORMAT_S24_3LE: sample
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* @GST_AUDIO_FORMAT_S24_3BE: sample
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* @GST_AUDIO_FORMAT_U24_3LE: sample
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* @GST_AUDIO_FORMAT_U24_3BE: sample
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* @GST_AUDIO_FORMAT_S20_3LE: sample
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* @GST_AUDIO_FORMAT_S20_3BE: sample
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* @GST_AUDIO_FORMAT_U20_3LE: sample
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* @GST_AUDIO_FORMAT_U20_3BE: sample
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* @GST_AUDIO_FORMAT_S18_3LE: sample
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* @GST_AUDIO_FORMAT_S18_3BE: sample
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* @GST_AUDIO_FORMAT_U18_3LE: sample
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* @GST_AUDIO_FORMAT_U18_3BE: sample
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* @GST_AUDIO_FORMAT_F32_LE: sample
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* @GST_AUDIO_FORMAT_F32_BE: sample
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* @GST_AUDIO_FORMAT_F64_LE: sample
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* @GST_AUDIO_FORMAT_F64_BE: sample
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*
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* Enum value describing the most common audio formats.
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*/
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typedef enum {
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GST_AUDIO_FORMAT_UNKNOWN,
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/* 8 bit */
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GST_AUDIO_FORMAT_S8,
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GST_AUDIO_FORMAT_U8,
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/* 16 bit */
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GST_AUDIO_FORMAT_S16_LE,
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GST_AUDIO_FORMAT_S16_BE,
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GST_AUDIO_FORMAT_U16_LE,
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GST_AUDIO_FORMAT_U16_BE,
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/* 24 bit in low 3 bytes of 32 bits*/
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GST_AUDIO_FORMAT_S24_LE,
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GST_AUDIO_FORMAT_S24_BE,
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GST_AUDIO_FORMAT_U24_LE,
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GST_AUDIO_FORMAT_U24_BE,
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/* 32 bit */
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GST_AUDIO_FORMAT_S32_LE,
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GST_AUDIO_FORMAT_S32_BE,
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GST_AUDIO_FORMAT_U32_LE,
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GST_AUDIO_FORMAT_U32_BE,
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/* 24 bit in 3 bytes*/
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GST_AUDIO_FORMAT_S24_3LE,
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GST_AUDIO_FORMAT_S24_3BE,
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GST_AUDIO_FORMAT_U24_3LE,
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GST_AUDIO_FORMAT_U24_3BE,
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/* 20 bit in 3 bytes*/
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GST_AUDIO_FORMAT_S20_3LE,
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GST_AUDIO_FORMAT_S20_3BE,
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GST_AUDIO_FORMAT_U20_3LE,
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GST_AUDIO_FORMAT_U20_3BE,
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/* 18 bit in 3 bytes*/
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GST_AUDIO_FORMAT_S18_3LE,
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GST_AUDIO_FORMAT_S18_3BE,
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GST_AUDIO_FORMAT_U18_3LE,
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GST_AUDIO_FORMAT_U18_3BE,
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/* float */
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GST_AUDIO_FORMAT_F32_LE,
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GST_AUDIO_FORMAT_F32_BE,
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GST_AUDIO_FORMAT_F64_LE,
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GST_AUDIO_FORMAT_F64_BE,
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#if G_BYTE_ORDER == G_BIG_ENDIAN
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GST_AUDIO_FORMAT_S16 = GST_AUDIO_FORMAT_S16_BE,
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GST_AUDIO_FORMAT_U16 = GST_AUDIO_FORMAT_U16_BE,
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GST_AUDIO_FORMAT_S24 = GST_AUDIO_FORMAT_S24_BE,
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GST_AUDIO_FORMAT_U24 = GST_AUDIO_FORMAT_U24_BE,
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GST_AUDIO_FORMAT_S32 = GST_AUDIO_FORMAT_S32_BE,
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GST_AUDIO_FORMAT_U32 = GST_AUDIO_FORMAT_U32_BE,
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GST_AUDIO_FORMAT_S24_3 = GST_AUDIO_FORMAT_S24_3BE,
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GST_AUDIO_FORMAT_U24_3 = GST_AUDIO_FORMAT_U24_3BE,
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GST_AUDIO_FORMAT_S20_3 = GST_AUDIO_FORMAT_S20_3BE,
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GST_AUDIO_FORMAT_U20_3 = GST_AUDIO_FORMAT_U20_3BE,
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GST_AUDIO_FORMAT_S18_3 = GST_AUDIO_FORMAT_S18_3BE,
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GST_AUDIO_FORMAT_U18_3 = GST_AUDIO_FORMAT_U18_3BE,
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GST_AUDIO_FORMAT_F32 = GST_AUDIO_FORMAT_F32_BE,
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GST_AUDIO_FORMAT_F64 = GST_AUDIO_FORMAT_F64_BE
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#elif G_BYTE_ORDER == G_LITTLE_ENDIAN
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GST_AUDIO_FORMAT_S16 = GST_AUDIO_FORMAT_S16_LE,
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GST_AUDIO_FORMAT_U16 = GST_AUDIO_FORMAT_U16_LE,
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GST_AUDIO_FORMAT_S24 = GST_AUDIO_FORMAT_S24_LE,
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GST_AUDIO_FORMAT_U24 = GST_AUDIO_FORMAT_U24_LE,
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GST_AUDIO_FORMAT_S32 = GST_AUDIO_FORMAT_S32_LE,
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GST_AUDIO_FORMAT_U32 = GST_AUDIO_FORMAT_U32_LE,
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GST_AUDIO_FORMAT_S24_3 = GST_AUDIO_FORMAT_S24_3LE,
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GST_AUDIO_FORMAT_U24_3 = GST_AUDIO_FORMAT_U24_3LE,
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GST_AUDIO_FORMAT_S20_3 = GST_AUDIO_FORMAT_S20_3LE,
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GST_AUDIO_FORMAT_U20_3 = GST_AUDIO_FORMAT_U20_3LE,
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GST_AUDIO_FORMAT_S18_3 = GST_AUDIO_FORMAT_S18_3LE,
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GST_AUDIO_FORMAT_U18_3 = GST_AUDIO_FORMAT_U18_3LE,
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GST_AUDIO_FORMAT_F32 = GST_AUDIO_FORMAT_F32_LE,
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GST_AUDIO_FORMAT_F64 = GST_AUDIO_FORMAT_F64_LE
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#endif
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} GstAudioFormat;
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typedef struct _GstAudioFormatInfo GstAudioFormatInfo;
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typedef struct _GstAudioInfo GstAudioInfo;
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/**
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* GstAudioFormatFlags:
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* @GST_AUDIO_FORMAT_FLAG_INT: int samples
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* @GST_AUDIO_FORMAT_FLAG_FLOAT: float samples
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* @GST_AUDIO_FORMAT_FLAG_SIGNED: signed samples
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* @GST_AUDIO_FORMAT_FLAG_COMPLEX: complex layout
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*
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* The different audio flags that a format info can have.
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*/
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typedef enum
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{
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GST_AUDIO_FORMAT_FLAG_INT = (1 << 0),
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GST_AUDIO_FORMAT_FLAG_FLOAT = (1 << 1),
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GST_AUDIO_FORMAT_FLAG_SIGNED = (1 << 2),
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GST_AUDIO_FORMAT_FLAG_COMPLEX = (1 << 4)
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} GstAudioFormatFlags;
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/**
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* GstAudioFormatUnpack:
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* @info: a #GstAudioFormatInfo
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* @dest: a destination array
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* @data: pointer to the audio data
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* @length: the amount of samples to unpack.
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*
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* Unpacks @length samples from the given data of format @info.
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* The samples will be unpacked into @dest which each channel
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* interleaved. @dest should at least be big enough to hold @length *
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* channels * unpack_size bytes.
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*/
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typedef void (*GstAudioFormatUnpack) (GstAudioFormatInfo *info, gpointer dest,
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const gpointer data, gint length);
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/**
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* GstAudioFormatPack:
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* @info: a #GstAudioFormatInfo
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* @src: a source array
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* @data: pointer to the destination data
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* @length: the amount of samples to pack.
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*
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* Packs @length samples from @src to the data array in format @info.
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* The samples from source have each channel interleaved
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* and will be packed into @data.
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*/
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typedef void (*GstAudioFormatPack) (GstAudioFormatInfo *info, const gpointer src,
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gpointer data, gint length);
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/**
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* GstAudioFormatInfo:
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* @format: #GstAudioFormat
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* @name: string representation of the format
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* @flags: #GstAudioFormatFlags
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* @endianness: the endianness
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* @width: amount of bits used for one sample
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* @depth: amount of valid bits in @width
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* @silence: @width/8 bytes with 1 silent sample
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* @unpack_size: number of bytes for the unpack functions
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* @unpack_func: function to unpack samples
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* @pack_func: function to pack samples
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*
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* Information for an audio format.
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*/
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struct _GstAudioFormatInfo {
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GstAudioFormat format;
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const gchar *name;
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GstAudioFormatFlags flags;
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gint endianness;
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gint width;
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gint depth;
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guint8 silence[8];
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guint unpack_size;
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GstAudioFormatUnpack unpack_func;
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GstAudioFormatPack pack_func;
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};
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#define GST_AUDIO_FORMAT_INFO_FORMAT(info) ((info)->format)
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#define GST_AUDIO_FORMAT_INFO_NAME(info) ((info)->name)
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#define GST_AUDIO_FORMAT_INFO_FLAGS(info) ((info)->flags)
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#define GST_AUDIO_FORMAT_INFO_IS_INT(info) ((info)->flags & GST_AUDIO_FORMAT_FLAG_INT)
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#define GST_AUDIO_FORMAT_INFO_IS_FLOAT(info) ((info)->flags & GST_AUDIO_FORMAT_FLAG_FLOAT)
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#define GST_AUDIO_FORMAT_INFO_IS_SIGNED(info) ((info)->flags & GST_AUDIO_FORMAT_FLAG_SIGNED)
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#define GST_AUDIO_FORMAT_INFO_ENDIANNESS(info) ((info)->endianness)
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#define GST_AUDIO_FORMAT_INFO_IS_LE(info) ((info)->endianness == G_LITTLE_ENDIAN)
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#define GST_AUDIO_FORMAT_INFO_IS_BE(info) ((info)->endianness == G_BIG_ENDIAN)
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#define GST_AUDIO_FORMAT_INFO_WIDTH(info) ((info)->width)
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#define GST_AUDIO_FORMAT_INFO_DEPTH(info) ((info)->depth)
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GstAudioFormat gst_audio_format_from_string (const gchar *format) G_GNUC_CONST;
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const gchar * gst_audio_format_to_string (GstAudioFormat format) G_GNUC_CONST;
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const GstAudioFormatInfo *
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gst_audio_format_get_info (GstAudioFormat format) G_GNUC_CONST;
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void gst_audio_format_fill_silence (const GstAudioFormatInfo *info,
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gpointer dest, gsize length);
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/**
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* GstAudioFlags:
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* @GST_AUDIO_FLAG_NONE: no valid flag
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* @GST_AUDIO_FLAG_UNPOSITIONED: unpositioned audio layout, position array
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* contains the default layout.
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*
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* Extra audio flags
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*/
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typedef enum {
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GST_AUDIO_FLAG_NONE = 0,
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GST_AUDIO_FLAG_UNPOSITIONED = (1 << 0)
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} GstAudioFlags;
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/**
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* GstAudioInfo:
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* @finfo: the format info of the audio
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* @flags: additional audio flags
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* @rate: the audio sample rate
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* @channels: the number of channels
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* @bpf: the number of bytes for one frame, this is the size of one
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* sample * @channels
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* @positions: the positions for each channel
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*
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* Information describing audio properties. This information can be filled
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* in from GstCaps with gst_audio_info_from_caps().
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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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struct _GstAudioInfo {
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const GstAudioFormatInfo *finfo;
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GstAudioFlags flags;
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gint rate;
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gint channels;
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gint bpf;
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GstAudioChannelPosition position[64];
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};
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#define GST_AUDIO_INFO_FORMAT(i) (GST_AUDIO_FORMAT_INFO_FORMAT((i)->finfo))
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#define GST_AUDIO_INFO_NAME(i) (GST_AUDIO_FORMAT_INFO_NAME((i)->finfo))
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#define GST_AUDIO_INFO_WIDTH(i) (GST_AUDIO_FORMAT_INFO_WIDTH((i)->finfo))
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#define GST_AUDIO_INFO_DEPTH(i) (GST_AUDIO_FORMAT_INFO_DEPTH((i)->finfo))
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#define GST_AUDIO_INFO_BPS(info) (GST_AUDIO_INFO_DEPTH(info) >> 3)
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#define GST_AUDIO_INFO_FLAGS(info) ((info)->flags)
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#define GST_AUDIO_INFO_IS_UNPOSITIONED(info) ((info)->flags & GST_AUDIO_FLAG_UNPOSITIONED)
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#define GST_AUDIO_INFO_RATE(info) ((info)->rate)
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#define GST_AUDIO_INFO_CHANNELS(info) ((info)->channels)
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#define GST_AUDIO_INFO_BPF(info) ((info)->bpf)
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#define GST_AUDIO_INFO_POSITION(info,c) ((info)->position[c])
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void gst_audio_info_init (GstAudioInfo *info);
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void gst_audio_info_set_format (GstAudioInfo *info, GstAudioFormat format,
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gint rate, gint channels);
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gboolean gst_audio_info_from_caps (GstAudioInfo *info, const GstCaps *caps);
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GstCaps * gst_audio_info_to_caps (GstAudioInfo *info);
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#define GST_AUDIO_RATE_RANGE "(int) [ 1, max ]"
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#define GST_AUDIO_CHANNELS_RANGE "(int) [ 1, max ]"
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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# define GST_AUDIO_NE(s) G_STRINGIFY(s)"_LE"
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# define GST_AUDIO_OE(s) G_STRINGIFY(s)"_BE"
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#else
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# define GST_AUDIO_NE(s) G_STRINGIFY(s)"_BE"
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# define GST_AUDIO_OE(s) G_STRINGIFY(s)"_LE"
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#endif
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#define GST_AUDIO_FORMATS_ALL " { S8, U8, " \
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"S16_LE, S16_BE, U16_LE, U16_BE, " \
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"S24_LE, S24_BE, U24_LE, U24_BE, " \
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"S32_LE, S32_BE, U32_LE, U32_BE, " \
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"S24_3LE, S24_3BE, U24_3LE, U24_3BE, " \
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"S20_3LE, S20_3BE, U20_3LE, U20_3BE, " \
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"S18_3LE, S18_3BE, U18_3LE, U18_3BE, " \
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"F32_LE, F32_BE, F64_LE, F64_BE }"
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/**
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* GST_AUDIO_CAPS_MAKE:
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* @format: string format that describes the pixel layout, as string
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* (e.g. "S16_LE", "S8", etc.)
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*
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* Generic caps string for audio, for use in pad templates.
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*/
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#define GST_AUDIO_CAPS_MAKE(format) \
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"audio/x-raw, " \
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"format = (string) " format ", " \
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"rate = " GST_AUDIO_RATE_RANGE ", " \
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"channels = " GST_AUDIO_CHANNELS_RANGE
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/**
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* GST_AUDIO_DEF_RATE:
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*
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* Standard sampling rate used in consumer audio.
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*/
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#define GST_AUDIO_DEF_RATE 44100
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/**
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* GST_AUDIO_DEF_CHANNELS:
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*
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* Standard number of channels used in consumer audio.
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*/
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#define GST_AUDIO_DEF_CHANNELS 2
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/**
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* GST_AUDIO_DEF_FORMAT:
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*
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* Standard format used in consumer audio.
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*/
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#define GST_AUDIO_DEF_FORMAT "S16_LE"
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/* conversion macros */
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/**
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* GST_FRAMES_TO_CLOCK_TIME:
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* @frames: sample frames
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* @rate: sampling rate
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*
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* Calculate clocktime from sample @frames and @rate.
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*/
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#define GST_FRAMES_TO_CLOCK_TIME(frames, rate) \
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((GstClockTime) gst_util_uint64_scale_round (frames, GST_SECOND, rate))
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/**
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* GST_CLOCK_TIME_TO_FRAMES:
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* @clocktime: clock time
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* @rate: sampling rate
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*
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* Calculate frames from @clocktime and sample @rate.
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*/
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#define GST_CLOCK_TIME_TO_FRAMES(clocktime, rate) \
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gst_util_uint64_scale_round (clocktime, rate, GST_SECOND)
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/*
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* this library defines and implements some helper functions for audio
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* handling
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*/
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/* get byte size of audio frame (based on caps of pad */
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int gst_audio_frame_byte_size (GstPad* pad);
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/* get length in frames of buffer */
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long gst_audio_frame_length (GstPad* pad, GstBuffer* buf);
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GstClockTime gst_audio_duration_from_pad_buffer (GstPad * pad, GstBuffer * buf);
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/* check if the buffer size is a whole multiple of the frame size */
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gboolean gst_audio_is_buffer_framed (GstPad* pad, GstBuffer* buf);
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GstBuffer *gst_audio_buffer_clip (GstBuffer *buffer, GstSegment *segment, gint rate, gint frame_size);
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G_END_DECLS
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#endif /* __GST_AUDIO_AUDIO_H__ */
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