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output/alsa: move code from AlsaSetup() to AlsaSetupHw()

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This commit is contained in:
Max Kellermann 2017-01-24 22:48:48 +01:00
parent 44dd9af276
commit 2b79fe2d6a
1 changed files with 46 additions and 29 deletions
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75
src/output/plugins/AlsaOutputPlugin.cxx
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@ -477,50 +477,44 @@ AlsaSetupFormat(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
}
/**
* Set up the snd_pcm_t object which was opened by the caller. Set up
* the configured settings and the audio format.
* Wrapper for snd_pcm_hw_params().
*
* Throws #std::runtime_error on error.
* @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
AlsaSetup(AlsaOutput *ad, AudioFormat &audio_format,
PcmExport::Params &params)
AlsaSetupHw(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
unsigned buffer_time, unsigned period_time,
AudioFormat &audio_format, PcmExport::Params &params)
{
unsigned int channels = audio_format.channels;
int err;
unsigned retry = MPD_ALSA_RETRY_NR;
unsigned int period_time, period_time_ro;
unsigned int buffer_time;
unsigned int period_time_ro = period_time;
period_time_ro = period_time = ad->period_time;
configure_hw:
/* configure HW params */
snd_pcm_hw_params_t *hwparams;
snd_pcm_hw_params_alloca(&hwparams);
err = snd_pcm_hw_params_any(ad->pcm, hwparams);
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(ad->pcm, hwparams,
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 = AlsaSetupFormat(ad->pcm, hwparams, audio_format, params);
err = AlsaSetupFormat(pcm, hwparams, audio_format, params);
if (err < 0)
throw FormatRuntimeError("Failed to configure format %s: %s",
sample_format_to_string(audio_format.format),
snd_strerror(-err));
snd_pcm_format_t format;
if (snd_pcm_hw_params_get_format(hwparams, &format) == 0)
FormatDebug(alsa_output_domain,
"format=%s (%s)", snd_pcm_format_name(format),
snd_pcm_format_description(format));
err = snd_pcm_hw_params_set_channels_near(ad->pcm, hwparams,
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",
@ -533,7 +527,7 @@ configure_hw:
params.CalcOutputSampleRate(audio_format.sample_rate);
unsigned output_sample_rate = requested_sample_rate;
err = snd_pcm_hw_params_set_rate_near(ad->pcm, hwparams,
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",
@ -567,9 +561,8 @@ configure_hw:
(unsigned)period_size_min, (unsigned)period_size_max,
period_time_min, period_time_max);
if (ad->buffer_time > 0) {
buffer_time = ad->buffer_time;
err = snd_pcm_hw_params_set_buffer_time_near(ad->pcm, hwparams,
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",
@ -591,14 +584,14 @@ configure_hw:
if (period_time_ro > 0) {
period_time = period_time_ro;
err = snd_pcm_hw_params_set_period_time_near(ad->pcm, hwparams,
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(ad->pcm, hwparams);
err = snd_pcm_hw_params(pcm, hwparams);
if (err == -EPIPE && --retry > 0 && period_time_ro > 0) {
period_time_ro = period_time_ro >> 1;
goto configure_hw;
@ -608,9 +601,33 @@ configure_hw:
if (retry != MPD_ALSA_RETRY_NR)
FormatDebug(alsa_output_domain,
"ALSA period_time set to %d", period_time);
}
/**
* Set up the snd_pcm_t object which was opened by the caller. Set up
* the configured settings and the audio format.
*
* Throws #std::runtime_error on error.
*/
static void
AlsaSetup(AlsaOutput *ad, AudioFormat &audio_format,
PcmExport::Params &params)
{
snd_pcm_hw_params_t *hwparams;
snd_pcm_hw_params_alloca(&hwparams);
AlsaSetupHw(ad->pcm, hwparams,
ad->buffer_time, ad->period_time,
audio_format, params);
snd_pcm_format_t format;
if (snd_pcm_hw_params_get_format(hwparams, &format) == 0)
FormatDebug(alsa_output_domain,
"format=%s (%s)", snd_pcm_format_name(format),
snd_pcm_format_description(format));
snd_pcm_uframes_t alsa_buffer_size;
err = snd_pcm_hw_params_get_buffer_size(hwparams, &alsa_buffer_size);
int err = snd_pcm_hw_params_get_buffer_size(hwparams, &alsa_buffer_size);
if (err < 0)
throw FormatRuntimeError("snd_pcm_hw_params_get_buffer_size() failed: %s",
snd_strerror(-err));
@ -666,7 +683,7 @@ configure_hw:
ad->silence = new uint8_t[snd_pcm_frames_to_bytes(ad->pcm,
alsa_period_size)];
snd_pcm_format_set_silence(format, ad->silence,
alsa_period_size * channels);
alsa_period_size * audio_format.channels);
}