output/alsa: move AlsaSetupHw() to lib/alsa/HwSetup.cxx
This commit is contained in:
Max Kellermann
parent
890f1f5928
commit
b7e035b6f3
@ -258,6 +258,7 @@ UPNP_SOURCES = \
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ALSA_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/Version.cxx src/lib/alsa/Version.hxx \
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src/lib/alsa/HwSetup.cxx src/lib/alsa/HwSetup.hxx \
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src/lib/alsa/Format.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/PeriodBuffer.hxx \
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src/lib/alsa/NonBlock.cxx src/lib/alsa/NonBlock.hxx
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src/lib/alsa/NonBlock.cxx src/lib/alsa/NonBlock.hxx
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290
src/lib/alsa/HwSetup.cxx
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290
src/lib/alsa/HwSetup.cxx
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@ -0,0 +1,290 @@
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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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#include "config.h"
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#include "HwSetup.hxx"
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#include "Format.hxx"
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#include "system/ByteOrder.hxx"
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#include "util/Domain.hxx"
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#include "util/RuntimeError.hxx"
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#include "AudioFormat.hxx"
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#include "Log.hxx"
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static constexpr Domain alsa_output_domain("alsa_output");
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namespace Alsa {
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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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*/
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static int
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TryFormatOrPacked(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
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snd_pcm_format_t fmt, PcmExport::Params ¶ms)
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{
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int err = snd_pcm_hw_params_set_format(pcm, hwparams, fmt);
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if (err == 0)
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params.pack24 = false;
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if (err != -EINVAL)
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return err;
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fmt = PackAlsaPcmFormat(fmt);
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if (fmt == SND_PCM_FORMAT_UNKNOWN)
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return -EINVAL;
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err = snd_pcm_hw_params_set_format(pcm, hwparams, fmt);
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if (err == 0)
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params.pack24 = true;
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return err;
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}
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/**
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* Attempts to configure the specified sample format, and tries the
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* reversed host byte order if was not supported.
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*/
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static int
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TryFormatOrByteSwap(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
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snd_pcm_format_t fmt,
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PcmExport::Params ¶ms)
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{
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int err = TryFormatOrPacked(pcm, hwparams, fmt, params);
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if (err == 0)
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params.reverse_endian = false;
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if (err != -EINVAL)
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return err;
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fmt = ByteSwapAlsaPcmFormat(fmt);
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if (fmt == SND_PCM_FORMAT_UNKNOWN)
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return -EINVAL;
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err = TryFormatOrPacked(pcm, hwparams, fmt, params);
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if (err == 0)
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params.reverse_endian = true;
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return err;
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}
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/**
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* Attempts to configure the specified sample format. On DSD_U8
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* failure, attempt to switch to DSD_U32 or DSD_U16.
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*/
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static int
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TryFormatDsd(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
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snd_pcm_format_t fmt, PcmExport::Params ¶ms)
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{
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int err = TryFormatOrByteSwap(pcm, hwparams, fmt, params);
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#if defined(ENABLE_DSD) && defined(HAVE_ALSA_DSD_U32)
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if (err == 0) {
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params.dsd_u16 = false;
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params.dsd_u32 = false;
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}
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if (err == -EINVAL && fmt == SND_PCM_FORMAT_DSD_U8) {
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/* attempt to switch to DSD_U32 */
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fmt = IsLittleEndian()
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? SND_PCM_FORMAT_DSD_U32_LE
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: SND_PCM_FORMAT_DSD_U32_BE;
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err = TryFormatOrByteSwap(pcm, hwparams, fmt, params);
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if (err == 0)
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params.dsd_u32 = true;
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else
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fmt = SND_PCM_FORMAT_DSD_U8;
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}
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if (err == -EINVAL && fmt == SND_PCM_FORMAT_DSD_U8) {
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/* attempt to switch to DSD_U16 */
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fmt = IsLittleEndian()
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? SND_PCM_FORMAT_DSD_U16_LE
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: SND_PCM_FORMAT_DSD_U16_BE;
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err = TryFormatOrByteSwap(pcm, hwparams, fmt, params);
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if (err == 0)
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params.dsd_u16 = true;
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else
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fmt = SND_PCM_FORMAT_DSD_U8;
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}
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#endif
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return err;
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}
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static int
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TryFormat(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
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SampleFormat sample_format,
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PcmExport::Params ¶ms)
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{
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snd_pcm_format_t alsa_format = ToAlsaPcmFormat(sample_format);
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if (alsa_format == SND_PCM_FORMAT_UNKNOWN)
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return -EINVAL;
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return TryFormatDsd(pcm, hwparams, alsa_format, params);
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}
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/**
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* Configure a sample format, and probe other formats if that fails.
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*/
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static int
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SetupSampleFormat(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
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SampleFormat &sample_format,
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PcmExport::Params ¶ms)
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{
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/* try the input format first */
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int err = TryFormat(pcm, hwparams, sample_format, params);
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/* if unsupported by the hardware, try other formats */
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static constexpr SampleFormat probe_formats[] = {
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SampleFormat::S24_P32,
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SampleFormat::S32,
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SampleFormat::S16,
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SampleFormat::S8,
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SampleFormat::UNDEFINED,
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};
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for (unsigned i = 0;
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err == -EINVAL && probe_formats[i] != SampleFormat::UNDEFINED;
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++i) {
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const SampleFormat mpd_format = probe_formats[i];
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if (mpd_format == sample_format)
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continue;
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err = TryFormat(pcm, hwparams, mpd_format, params);
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if (err == 0)
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sample_format = mpd_format;
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}
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return err;
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}
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void
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SetupHw(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
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unsigned buffer_time, unsigned period_time,
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AudioFormat &audio_format, PcmExport::Params ¶ms)
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{
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int err;
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unsigned int period_time_ro = period_time;
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/* configure HW params */
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err = snd_pcm_hw_params_any(pcm, hwparams);
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if (err < 0)
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throw FormatRuntimeError("snd_pcm_hw_params_any() failed: %s",
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snd_strerror(-err));
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err = snd_pcm_hw_params_set_access(pcm, hwparams,
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SND_PCM_ACCESS_RW_INTERLEAVED);
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if (err < 0)
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throw FormatRuntimeError("snd_pcm_hw_params_set_access() failed: %s",
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snd_strerror(-err));
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err = SetupSampleFormat(pcm, hwparams,
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audio_format.format, params);
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if (err < 0)
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throw FormatRuntimeError("Failed to configure format %s: %s",
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sample_format_to_string(audio_format.format),
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snd_strerror(-err));
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unsigned int channels = audio_format.channels;
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err = snd_pcm_hw_params_set_channels_near(pcm, hwparams,
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&channels);
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if (err < 0)
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throw FormatRuntimeError("Failed to configure %i channels: %s",
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(int)audio_format.channels,
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snd_strerror(-err));
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audio_format.channels = (int8_t)channels;
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const unsigned requested_sample_rate =
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params.CalcOutputSampleRate(audio_format.sample_rate);
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unsigned output_sample_rate = requested_sample_rate;
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err = snd_pcm_hw_params_set_rate_near(pcm, hwparams,
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&output_sample_rate, nullptr);
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if (err < 0)
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throw FormatRuntimeError("Failed to configure sample rate %u Hz: %s",
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requested_sample_rate,
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snd_strerror(-err));
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if (output_sample_rate == 0)
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throw FormatRuntimeError("Failed to configure sample rate %u Hz",
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audio_format.sample_rate);
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if (output_sample_rate != requested_sample_rate)
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audio_format.sample_rate = params.CalcInputSampleRate(output_sample_rate);
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snd_pcm_uframes_t buffer_size_min, buffer_size_max;
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snd_pcm_hw_params_get_buffer_size_min(hwparams, &buffer_size_min);
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snd_pcm_hw_params_get_buffer_size_max(hwparams, &buffer_size_max);
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unsigned buffer_time_min, buffer_time_max;
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snd_pcm_hw_params_get_buffer_time_min(hwparams, &buffer_time_min, 0);
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snd_pcm_hw_params_get_buffer_time_max(hwparams, &buffer_time_max, 0);
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FormatDebug(alsa_output_domain, "buffer: size=%u..%u time=%u..%u",
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(unsigned)buffer_size_min, (unsigned)buffer_size_max,
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buffer_time_min, buffer_time_max);
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snd_pcm_uframes_t period_size_min, period_size_max;
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snd_pcm_hw_params_get_period_size_min(hwparams, &period_size_min, 0);
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snd_pcm_hw_params_get_period_size_max(hwparams, &period_size_max, 0);
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unsigned period_time_min, period_time_max;
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snd_pcm_hw_params_get_period_time_min(hwparams, &period_time_min, 0);
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snd_pcm_hw_params_get_period_time_max(hwparams, &period_time_max, 0);
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FormatDebug(alsa_output_domain, "period: size=%u..%u time=%u..%u",
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(unsigned)period_size_min, (unsigned)period_size_max,
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period_time_min, period_time_max);
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if (buffer_time > 0) {
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err = snd_pcm_hw_params_set_buffer_time_near(pcm, hwparams,
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&buffer_time, nullptr);
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if (err < 0)
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throw FormatRuntimeError("snd_pcm_hw_params_set_buffer_time_near() failed: %s",
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snd_strerror(-err));
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} else {
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err = snd_pcm_hw_params_get_buffer_time(hwparams, &buffer_time,
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nullptr);
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if (err < 0)
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buffer_time = 0;
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}
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if (period_time_ro == 0 && buffer_time >= 10000) {
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period_time_ro = period_time = buffer_time / 4;
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FormatDebug(alsa_output_domain,
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"default period_time = buffer_time/4 = %u/4 = %u",
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buffer_time, period_time);
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}
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if (period_time_ro > 0) {
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period_time = period_time_ro;
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err = snd_pcm_hw_params_set_period_time_near(pcm, hwparams,
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&period_time, nullptr);
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if (err < 0)
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throw FormatRuntimeError("snd_pcm_hw_params_set_period_time_near() failed: %s",
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snd_strerror(-err));
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}
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err = snd_pcm_hw_params(pcm, hwparams);
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if (err < 0)
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throw FormatRuntimeError("snd_pcm_hw_params() failed: %s",
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snd_strerror(-err));
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}
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} // namespace Alsa
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48
src/lib/alsa/HwSetup.hxx
Normal file
48
src/lib/alsa/HwSetup.hxx
Normal file
@ -0,0 +1,48 @@
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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_HW_SETUP_HXX
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#define MPD_ALSA_HW_SETUP_HXX
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#include "check.h"
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#include "pcm/PcmExport.hxx"
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#include <alsa/asoundlib.h>
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struct AudioFormat;
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namespace Alsa {
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/**
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* Wrapper for snd_pcm_hw_params().
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*
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* @param buffer_time the configured buffer time, or 0 if not configured
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* @param period_time the configured period time, or 0 if not configured
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* @param audio_format an #AudioFormat to be configured (or modified)
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* by this function
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* @param params to be modified by this function
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*/
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void
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SetupHw(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
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unsigned buffer_time, unsigned period_time,
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AudioFormat &audio_format, PcmExport::Params ¶ms);
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} // namespace Alsa
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#endif
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@ -19,14 +19,13 @@
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#include "config.h"
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#include "config.h"
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#include "AlsaOutputPlugin.hxx"
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#include "AlsaOutputPlugin.hxx"
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#include "lib/alsa/Format.hxx"
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#include "lib/alsa/HwSetup.hxx"
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#include "lib/alsa/NonBlock.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/PeriodBuffer.hxx"
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#include "lib/alsa/Version.hxx"
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#include "lib/alsa/Version.hxx"
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#include "../OutputAPI.hxx"
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#include "../OutputAPI.hxx"
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#include "mixer/MixerList.hxx"
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#include "mixer/MixerList.hxx"
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#include "pcm/PcmExport.hxx"
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#include "pcm/PcmExport.hxx"
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#include "system/ByteOrder.hxx"
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#include "thread/Mutex.hxx"
|
#include "thread/Mutex.hxx"
|
||||||
#include "thread/Cond.hxx"
|
#include "thread/Cond.hxx"
|
||||||
#include "util/Manual.hxx"
|
#include "util/Manual.hxx"
|
||||||
@ -357,272 +356,6 @@ alsa_test_default_device()
|
|||||||
return true;
|
return true;
|
||||||
}
|
}
|
||||||
|
|
||||||
/**
|
|
||||||
* Attempts to configure the specified sample format. On failure,
|
|
||||||
* fall back to the packed version.
|
|
||||||
*/
|
|
||||||
static int
|
|
||||||
AlsaTryFormatOrPacked(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
|
|
||||||
snd_pcm_format_t fmt, PcmExport::Params ¶ms)
|
|
||||||
{
|
|
||||||
int err = snd_pcm_hw_params_set_format(pcm, hwparams, fmt);
|
|
||||||
if (err == 0)
|
|
||||||
params.pack24 = false;
|
|
||||||
|
|
||||||
if (err != -EINVAL)
|
|
||||||
return err;
|
|
||||||
|
|
||||||
fmt = PackAlsaPcmFormat(fmt);
|
|
||||||
if (fmt == SND_PCM_FORMAT_UNKNOWN)
|
|
||||||
return -EINVAL;
|
|
||||||
|
|
||||||
err = snd_pcm_hw_params_set_format(pcm, hwparams, fmt);
|
|
||||||
if (err == 0)
|
|
||||||
params.pack24 = true;
|
|
||||||
|
|
||||||
return err;
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Attempts to configure the specified sample format, and tries the
|
|
||||||
* reversed host byte order if was not supported.
|
|
||||||
*/
|
|
||||||
static int
|
|
||||||
AlsaTryFormatOrByteSwap(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
|
|
||||||
snd_pcm_format_t fmt,
|
|
||||||
PcmExport::Params ¶ms)
|
|
||||||
{
|
|
||||||
int err = AlsaTryFormatOrPacked(pcm, hwparams, fmt, params);
|
|
||||||
if (err == 0)
|
|
||||||
params.reverse_endian = false;
|
|
||||||
|
|
||||||
if (err != -EINVAL)
|
|
||||||
return err;
|
|
||||||
|
|
||||||
fmt = ByteSwapAlsaPcmFormat(fmt);
|
|
||||||
if (fmt == SND_PCM_FORMAT_UNKNOWN)
|
|
||||||
return -EINVAL;
|
|
||||||
|
|
||||||
err = AlsaTryFormatOrPacked(pcm, hwparams, fmt, params);
|
|
||||||
if (err == 0)
|
|
||||||
params.reverse_endian = true;
|
|
||||||
|
|
||||||
return err;
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Attempts to configure the specified sample format. On DSD_U8
|
|
||||||
* failure, attempt to switch to DSD_U32 or DSD_U16.
|
|
||||||
*/
|
|
||||||
static int
|
|
||||||
AlsaTryFormatDsd(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
|
|
||||||
snd_pcm_format_t fmt, PcmExport::Params ¶ms)
|
|
||||||
{
|
|
||||||
int err = AlsaTryFormatOrByteSwap(pcm, hwparams, fmt, params);
|
|
||||||
|
|
||||||
#if defined(ENABLE_DSD) && defined(HAVE_ALSA_DSD_U32)
|
|
||||||
if (err == 0) {
|
|
||||||
params.dsd_u16 = false;
|
|
||||||
params.dsd_u32 = false;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (err == -EINVAL && fmt == SND_PCM_FORMAT_DSD_U8) {
|
|
||||||
/* attempt to switch to DSD_U32 */
|
|
||||||
fmt = IsLittleEndian()
|
|
||||||
? SND_PCM_FORMAT_DSD_U32_LE
|
|
||||||
: SND_PCM_FORMAT_DSD_U32_BE;
|
|
||||||
err = AlsaTryFormatOrByteSwap(pcm, hwparams, fmt, params);
|
|
||||||
if (err == 0)
|
|
||||||
params.dsd_u32 = true;
|
|
||||||
else
|
|
||||||
fmt = SND_PCM_FORMAT_DSD_U8;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (err == -EINVAL && fmt == SND_PCM_FORMAT_DSD_U8) {
|
|
||||||
/* attempt to switch to DSD_U16 */
|
|
||||||
fmt = IsLittleEndian()
|
|
||||||
? SND_PCM_FORMAT_DSD_U16_LE
|
|
||||||
: SND_PCM_FORMAT_DSD_U16_BE;
|
|
||||||
err = AlsaTryFormatOrByteSwap(pcm, hwparams, fmt, params);
|
|
||||||
if (err == 0)
|
|
||||||
params.dsd_u16 = true;
|
|
||||||
else
|
|
||||||
fmt = SND_PCM_FORMAT_DSD_U8;
|
|
||||||
}
|
|
||||||
#endif
|
|
||||||
|
|
||||||
return err;
|
|
||||||
}
|
|
||||||
|
|
||||||
static int
|
|
||||||
AlsaTryFormat(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
|
|
||||||
SampleFormat sample_format,
|
|
||||||
PcmExport::Params ¶ms)
|
|
||||||
{
|
|
||||||
snd_pcm_format_t alsa_format = ToAlsaPcmFormat(sample_format);
|
|
||||||
if (alsa_format == SND_PCM_FORMAT_UNKNOWN)
|
|
||||||
return -EINVAL;
|
|
||||||
|
|
||||||
return AlsaTryFormatDsd(pcm, hwparams, alsa_format, params);
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Configure a sample format, and probe other formats if that fails.
|
|
||||||
*/
|
|
||||||
static int
|
|
||||||
AlsaSetupSampleFormat(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
|
|
||||||
SampleFormat &sample_format,
|
|
||||||
PcmExport::Params ¶ms)
|
|
||||||
{
|
|
||||||
/* try the input format first */
|
|
||||||
|
|
||||||
int err = AlsaTryFormat(pcm, hwparams, sample_format, params);
|
|
||||||
|
|
||||||
/* if unsupported by the hardware, try other formats */
|
|
||||||
|
|
||||||
static constexpr SampleFormat probe_formats[] = {
|
|
||||||
SampleFormat::S24_P32,
|
|
||||||
SampleFormat::S32,
|
|
||||||
SampleFormat::S16,
|
|
||||||
SampleFormat::S8,
|
|
||||||
SampleFormat::UNDEFINED,
|
|
||||||
};
|
|
||||||
|
|
||||||
for (unsigned i = 0;
|
|
||||||
err == -EINVAL && probe_formats[i] != SampleFormat::UNDEFINED;
|
|
||||||
++i) {
|
|
||||||
const SampleFormat mpd_format = probe_formats[i];
|
|
||||||
if (mpd_format == sample_format)
|
|
||||||
continue;
|
|
||||||
|
|
||||||
err = AlsaTryFormat(pcm, hwparams, mpd_format, params);
|
|
||||||
if (err == 0)
|
|
||||||
sample_format = mpd_format;
|
|
||||||
}
|
|
||||||
|
|
||||||
return err;
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Wrapper for snd_pcm_hw_params().
|
|
||||||
*
|
|
||||||
* @param buffer_time the configured buffer time, or 0 if not configured
|
|
||||||
* @param period_time the configured period time, or 0 if not configured
|
|
||||||
* @param audio_format an #AudioFormat to be configured (or modified)
|
|
||||||
* by this function
|
|
||||||
* @param params to be modified by this function
|
|
||||||
*/
|
|
||||||
static void
|
|
||||||
AlsaSetupHw(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
|
|
||||||
unsigned buffer_time, unsigned period_time,
|
|
||||||
AudioFormat &audio_format, PcmExport::Params ¶ms)
|
|
||||||
{
|
|
||||||
int err;
|
|
||||||
unsigned int period_time_ro = period_time;
|
|
||||||
|
|
||||||
/* configure HW params */
|
|
||||||
err = snd_pcm_hw_params_any(pcm, hwparams);
|
|
||||||
if (err < 0)
|
|
||||||
throw FormatRuntimeError("snd_pcm_hw_params_any() failed: %s",
|
|
||||||
snd_strerror(-err));
|
|
||||||
|
|
||||||
err = snd_pcm_hw_params_set_access(pcm, hwparams,
|
|
||||||
SND_PCM_ACCESS_RW_INTERLEAVED);
|
|
||||||
if (err < 0)
|
|
||||||
throw FormatRuntimeError("snd_pcm_hw_params_set_access() failed: %s",
|
|
||||||
snd_strerror(-err));
|
|
||||||
|
|
||||||
err = AlsaSetupSampleFormat(pcm, hwparams,
|
|
||||||
audio_format.format, params);
|
|
||||||
if (err < 0)
|
|
||||||
throw FormatRuntimeError("Failed to configure format %s: %s",
|
|
||||||
sample_format_to_string(audio_format.format),
|
|
||||||
snd_strerror(-err));
|
|
||||||
|
|
||||||
unsigned int channels = audio_format.channels;
|
|
||||||
err = snd_pcm_hw_params_set_channels_near(pcm, hwparams,
|
|
||||||
&channels);
|
|
||||||
if (err < 0)
|
|
||||||
throw FormatRuntimeError("Failed to configure %i channels: %s",
|
|
||||||
(int)audio_format.channels,
|
|
||||||
snd_strerror(-err));
|
|
||||||
|
|
||||||
audio_format.channels = (int8_t)channels;
|
|
||||||
|
|
||||||
const unsigned requested_sample_rate =
|
|
||||||
params.CalcOutputSampleRate(audio_format.sample_rate);
|
|
||||||
unsigned output_sample_rate = requested_sample_rate;
|
|
||||||
|
|
||||||
err = snd_pcm_hw_params_set_rate_near(pcm, hwparams,
|
|
||||||
&output_sample_rate, nullptr);
|
|
||||||
if (err < 0)
|
|
||||||
throw FormatRuntimeError("Failed to configure sample rate %u Hz: %s",
|
|
||||||
requested_sample_rate,
|
|
||||||
snd_strerror(-err));
|
|
||||||
|
|
||||||
if (output_sample_rate == 0)
|
|
||||||
throw FormatRuntimeError("Failed to configure sample rate %u Hz",
|
|
||||||
audio_format.sample_rate);
|
|
||||||
|
|
||||||
if (output_sample_rate != requested_sample_rate)
|
|
||||||
audio_format.sample_rate = params.CalcInputSampleRate(output_sample_rate);
|
|
||||||
|
|
||||||
snd_pcm_uframes_t buffer_size_min, buffer_size_max;
|
|
||||||
snd_pcm_hw_params_get_buffer_size_min(hwparams, &buffer_size_min);
|
|
||||||
snd_pcm_hw_params_get_buffer_size_max(hwparams, &buffer_size_max);
|
|
||||||
unsigned buffer_time_min, buffer_time_max;
|
|
||||||
snd_pcm_hw_params_get_buffer_time_min(hwparams, &buffer_time_min, 0);
|
|
||||||
snd_pcm_hw_params_get_buffer_time_max(hwparams, &buffer_time_max, 0);
|
|
||||||
FormatDebug(alsa_output_domain, "buffer: size=%u..%u time=%u..%u",
|
|
||||||
(unsigned)buffer_size_min, (unsigned)buffer_size_max,
|
|
||||||
buffer_time_min, buffer_time_max);
|
|
||||||
|
|
||||||
snd_pcm_uframes_t period_size_min, period_size_max;
|
|
||||||
snd_pcm_hw_params_get_period_size_min(hwparams, &period_size_min, 0);
|
|
||||||
snd_pcm_hw_params_get_period_size_max(hwparams, &period_size_max, 0);
|
|
||||||
unsigned period_time_min, period_time_max;
|
|
||||||
snd_pcm_hw_params_get_period_time_min(hwparams, &period_time_min, 0);
|
|
||||||
snd_pcm_hw_params_get_period_time_max(hwparams, &period_time_max, 0);
|
|
||||||
FormatDebug(alsa_output_domain, "period: size=%u..%u time=%u..%u",
|
|
||||||
(unsigned)period_size_min, (unsigned)period_size_max,
|
|
||||||
period_time_min, period_time_max);
|
|
||||||
|
|
||||||
if (buffer_time > 0) {
|
|
||||||
err = snd_pcm_hw_params_set_buffer_time_near(pcm, hwparams,
|
|
||||||
&buffer_time, nullptr);
|
|
||||||
if (err < 0)
|
|
||||||
throw FormatRuntimeError("snd_pcm_hw_params_set_buffer_time_near() failed: %s",
|
|
||||||
snd_strerror(-err));
|
|
||||||
} else {
|
|
||||||
err = snd_pcm_hw_params_get_buffer_time(hwparams, &buffer_time,
|
|
||||||
nullptr);
|
|
||||||
if (err < 0)
|
|
||||||
buffer_time = 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (period_time_ro == 0 && buffer_time >= 10000) {
|
|
||||||
period_time_ro = period_time = buffer_time / 4;
|
|
||||||
|
|
||||||
FormatDebug(alsa_output_domain,
|
|
||||||
"default period_time = buffer_time/4 = %u/4 = %u",
|
|
||||||
buffer_time, period_time);
|
|
||||||
}
|
|
||||||
|
|
||||||
if (period_time_ro > 0) {
|
|
||||||
period_time = period_time_ro;
|
|
||||||
err = snd_pcm_hw_params_set_period_time_near(pcm, hwparams,
|
|
||||||
&period_time, nullptr);
|
|
||||||
if (err < 0)
|
|
||||||
throw FormatRuntimeError("snd_pcm_hw_params_set_period_time_near() failed: %s",
|
|
||||||
snd_strerror(-err));
|
|
||||||
}
|
|
||||||
|
|
||||||
err = snd_pcm_hw_params(pcm, hwparams);
|
|
||||||
if (err < 0)
|
|
||||||
throw FormatRuntimeError("snd_pcm_hw_params() failed: %s",
|
|
||||||
snd_strerror(-err));
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* Wrapper for snd_pcm_sw_params().
|
* Wrapper for snd_pcm_sw_params().
|
||||||
*/
|
*/
|
||||||
@ -662,7 +395,7 @@ AlsaOutput::Setup(AudioFormat &audio_format,
|
|||||||
snd_pcm_hw_params_t *hwparams;
|
snd_pcm_hw_params_t *hwparams;
|
||||||
snd_pcm_hw_params_alloca(&hwparams);
|
snd_pcm_hw_params_alloca(&hwparams);
|
||||||
|
|
||||||
AlsaSetupHw(pcm, hwparams,
|
Alsa::SetupHw(pcm, hwparams,
|
||||||
buffer_time, period_time,
|
buffer_time, period_time,
|
||||||
audio_format, params);
|
audio_format, params);
|
||||||
|
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user