output/alsa: move functions to lib/alsa/Format.hxx
This commit is contained in:
Max Kellermann
parent
b08cb148ae
commit
b30c37eb79
@ -258,6 +258,7 @@ UPNP_SOURCES = \
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ALSA_SOURCES = \
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src/lib/alsa/Version.cxx src/lib/alsa/Version.hxx \
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src/lib/alsa/Format.hxx \
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src/lib/alsa/PeriodBuffer.hxx \
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src/lib/alsa/NonBlock.cxx src/lib/alsa/NonBlock.hxx
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132
src/lib/alsa/Format.hxx
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132
src/lib/alsa/Format.hxx
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@ -0,0 +1,132 @@
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/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_ALSA_FORMAT_HXX
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#define MPD_ALSA_FORMAT_HXX
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#include "check.h"
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#include "pcm/SampleFormat.hxx"
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#include "Compiler.h"
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#include <alsa/asoundlib.h>
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#include <assert.h>
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/**
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* Convert MPD's #SampleFormat enum to libasound's snd_pcm_format_t
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* enum. Returns SND_PCM_FORMAT_UNKNOWN if there is no according ALSA
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* PCM format.
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*/
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gcc_const
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inline snd_pcm_format_t
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ToAlsaPcmFormat(SampleFormat sample_format) noexcept
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{
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switch (sample_format) {
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case SampleFormat::UNDEFINED:
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return SND_PCM_FORMAT_UNKNOWN;
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case SampleFormat::DSD:
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#ifdef HAVE_ALSA_DSD
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return SND_PCM_FORMAT_DSD_U8;
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#else
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return SND_PCM_FORMAT_UNKNOWN;
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#endif
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case SampleFormat::S8:
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return SND_PCM_FORMAT_S8;
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case SampleFormat::S16:
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return SND_PCM_FORMAT_S16;
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case SampleFormat::S24_P32:
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return SND_PCM_FORMAT_S24;
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case SampleFormat::S32:
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return SND_PCM_FORMAT_S32;
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case SampleFormat::FLOAT:
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return SND_PCM_FORMAT_FLOAT;
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}
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assert(false);
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gcc_unreachable();
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}
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/**
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* Determine the byte-swapped PCM format. Returns
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* SND_PCM_FORMAT_UNKNOWN if the format cannot be byte-swapped.
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*/
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gcc_const
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inline snd_pcm_format_t
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ByteSwapAlsaPcmFormat(snd_pcm_format_t fmt) noexcept
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{
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switch (fmt) {
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case SND_PCM_FORMAT_S16_LE: return SND_PCM_FORMAT_S16_BE;
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case SND_PCM_FORMAT_S24_LE: return SND_PCM_FORMAT_S24_BE;
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case SND_PCM_FORMAT_S32_LE: return SND_PCM_FORMAT_S32_BE;
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case SND_PCM_FORMAT_S16_BE: return SND_PCM_FORMAT_S16_LE;
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case SND_PCM_FORMAT_S24_BE: return SND_PCM_FORMAT_S24_LE;
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case SND_PCM_FORMAT_S24_3BE:
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return SND_PCM_FORMAT_S24_3LE;
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case SND_PCM_FORMAT_S24_3LE:
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return SND_PCM_FORMAT_S24_3BE;
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case SND_PCM_FORMAT_S32_BE: return SND_PCM_FORMAT_S32_LE;
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#ifdef HAVE_ALSA_DSD_U32
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case SND_PCM_FORMAT_DSD_U16_LE:
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return SND_PCM_FORMAT_DSD_U16_BE;
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case SND_PCM_FORMAT_DSD_U16_BE:
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return SND_PCM_FORMAT_DSD_U16_LE;
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case SND_PCM_FORMAT_DSD_U32_LE:
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return SND_PCM_FORMAT_DSD_U32_BE;
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case SND_PCM_FORMAT_DSD_U32_BE:
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return SND_PCM_FORMAT_DSD_U32_LE;
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#endif
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default: return SND_PCM_FORMAT_UNKNOWN;
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}
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}
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/**
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* Check if there is a "packed" version of the give PCM format.
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* Returns SND_PCM_FORMAT_UNKNOWN if not.
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*/
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gcc_const
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inline snd_pcm_format_t
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PackAlsaPcmFormat(snd_pcm_format_t fmt) noexcept
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{
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switch (fmt) {
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case SND_PCM_FORMAT_S24_LE:
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return SND_PCM_FORMAT_S24_3LE;
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case SND_PCM_FORMAT_S24_BE:
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return SND_PCM_FORMAT_S24_3BE;
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default:
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return SND_PCM_FORMAT_UNKNOWN;
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}
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}
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#endif
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@ -19,6 +19,7 @@
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#include "config.h"
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#include "AlsaOutputPlugin.hxx"
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#include "lib/alsa/Format.hxx"
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#include "lib/alsa/NonBlock.hxx"
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#include "lib/alsa/PeriodBuffer.hxx"
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#include "lib/alsa/Version.hxx"
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@ -366,105 +367,6 @@ alsa_test_default_device()
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return true;
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}
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/**
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* Convert MPD's #SampleFormat enum to libasound's snd_pcm_format_t
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* enum. Returns SND_PCM_FORMAT_UNKNOWN if there is no according ALSA
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* PCM format.
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*/
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gcc_const
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static snd_pcm_format_t
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ToAlsaPcmFormat(SampleFormat sample_format) noexcept
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{
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switch (sample_format) {
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case SampleFormat::UNDEFINED:
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return SND_PCM_FORMAT_UNKNOWN;
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case SampleFormat::DSD:
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#ifdef HAVE_ALSA_DSD
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return SND_PCM_FORMAT_DSD_U8;
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#else
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return SND_PCM_FORMAT_UNKNOWN;
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#endif
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case SampleFormat::S8:
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return SND_PCM_FORMAT_S8;
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case SampleFormat::S16:
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return SND_PCM_FORMAT_S16;
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case SampleFormat::S24_P32:
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return SND_PCM_FORMAT_S24;
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case SampleFormat::S32:
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return SND_PCM_FORMAT_S32;
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case SampleFormat::FLOAT:
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return SND_PCM_FORMAT_FLOAT;
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}
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assert(false);
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gcc_unreachable();
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}
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/**
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* Determine the byte-swapped PCM format. Returns
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* SND_PCM_FORMAT_UNKNOWN if the format cannot be byte-swapped.
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*/
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static snd_pcm_format_t
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ByteSwapAlsaPcmFormat(snd_pcm_format_t fmt) noexcept
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{
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switch (fmt) {
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case SND_PCM_FORMAT_S16_LE: return SND_PCM_FORMAT_S16_BE;
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case SND_PCM_FORMAT_S24_LE: return SND_PCM_FORMAT_S24_BE;
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case SND_PCM_FORMAT_S32_LE: return SND_PCM_FORMAT_S32_BE;
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case SND_PCM_FORMAT_S16_BE: return SND_PCM_FORMAT_S16_LE;
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case SND_PCM_FORMAT_S24_BE: return SND_PCM_FORMAT_S24_LE;
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case SND_PCM_FORMAT_S24_3BE:
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return SND_PCM_FORMAT_S24_3LE;
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case SND_PCM_FORMAT_S24_3LE:
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return SND_PCM_FORMAT_S24_3BE;
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case SND_PCM_FORMAT_S32_BE: return SND_PCM_FORMAT_S32_LE;
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#ifdef HAVE_ALSA_DSD_U32
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case SND_PCM_FORMAT_DSD_U16_LE:
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return SND_PCM_FORMAT_DSD_U16_BE;
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case SND_PCM_FORMAT_DSD_U16_BE:
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return SND_PCM_FORMAT_DSD_U16_LE;
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case SND_PCM_FORMAT_DSD_U32_LE:
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return SND_PCM_FORMAT_DSD_U32_BE;
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case SND_PCM_FORMAT_DSD_U32_BE:
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return SND_PCM_FORMAT_DSD_U32_LE;
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#endif
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default: return SND_PCM_FORMAT_UNKNOWN;
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}
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}
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/**
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* Check if there is a "packed" version of the give PCM format.
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* Returns SND_PCM_FORMAT_UNKNOWN if not.
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*/
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static snd_pcm_format_t
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PackAlsaPcmFormat(snd_pcm_format_t fmt)
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{
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switch (fmt) {
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case SND_PCM_FORMAT_S24_LE:
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return SND_PCM_FORMAT_S24_3LE;
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case SND_PCM_FORMAT_S24_BE:
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return SND_PCM_FORMAT_S24_3BE;
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default:
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return SND_PCM_FORMAT_UNKNOWN;
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}
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}
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/**
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* Attempts to configure the specified sample format. On failure,
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* fall back to the packed version.
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