diff options
Diffstat (limited to 'src/audioOutputs/audioOutput_alsa.c')
| -rw-r--r-- | src/audioOutputs/audioOutput_alsa.c | 33 |
1 files changed, 20 insertions, 13 deletions
diff --git a/src/audioOutputs/audioOutput_alsa.c b/src/audioOutputs/audioOutput_alsa.c index 603abcee4..c129e2d6e 100644 --- a/src/audioOutputs/audioOutput_alsa.c +++ b/src/audioOutputs/audioOutput_alsa.c @@ -25,12 +25,12 @@ #define ALSA_PCM_NEW_HW_PARAMS_API #define ALSA_PCM_NEW_SW_PARAMS_API -#define MPD_ALSA_BUFFER_TIME 500000 +#define MPD_ALSA_BUFFER_TIME_US 500000 /* the default period time of xmms is 50 ms, so let's use that as well. * a user can tweak this parameter via the "period_time" config parameter. */ -#define MPD_ALSA_PERIOD_TIME 50000 -#define MPD_ALSA_SAMPLE_XFER 256 +#define MPD_ALSA_PERIOD_TIME_US 50000 +#define MPD_ALSA_RETRY_NR 5 #include "../conf.h" #include "../log.h" @@ -65,8 +65,8 @@ static AlsaData *newAlsaData(void) ret->pcmHandle = NULL; ret->writei = snd_pcm_writei; ret->useMmap = 0; - ret->buffer_time = MPD_ALSA_BUFFER_TIME; - ret->period_time = MPD_ALSA_PERIOD_TIME; + ret->buffer_time = MPD_ALSA_BUFFER_TIME_US; + ret->period_time = MPD_ALSA_PERIOD_TIME_US; return ret; } @@ -139,7 +139,9 @@ static int alsa_openDevice(AudioOutput * audioOutput) snd_pcm_uframes_t alsa_buffer_size; snd_pcm_uframes_t alsa_period_size; int err; - char *cmd = NULL; + const char *cmd = NULL; + unsigned int period_time; + int retry = MPD_ALSA_RETRY_NR; switch (audioFormat->bits) { case 8: @@ -155,7 +157,7 @@ static int alsa_openDevice(AudioOutput * audioOutput) bitformat = SND_PCM_FORMAT_S32; break; default: - ERROR("Alsa device \"%s\" doesn't support %i bit audio\n", + ERROR("ALSA device \"%s\" doesn't support %i bit audio\n", ad->device, audioFormat->bits); return -1; } @@ -173,6 +175,7 @@ static int alsa_openDevice(AudioOutput * audioOutput) if (err < 0) goto error; +configure_hw: /* configure HW params */ snd_pcm_hw_params_alloca(&hwparams); @@ -204,7 +207,7 @@ static int alsa_openDevice(AudioOutput * audioOutput) err = snd_pcm_hw_params_set_format(ad->pcmHandle, hwparams, bitformat); if (err < 0) { - ERROR("Alsa device \"%s\" does not support %i bit audio: " + ERROR("ALSA device \"%s\" does not support %i bit audio: " "%s\n", ad->device, (int)bitformat, snd_strerror(-err)); goto fail; } @@ -212,7 +215,7 @@ static int alsa_openDevice(AudioOutput * audioOutput) err = snd_pcm_hw_params_set_channels_near(ad->pcmHandle, hwparams, &channels); if (err < 0) { - ERROR("Alsa device \"%s\" does not support %i channels: " + ERROR("ALSA device \"%s\" does not support %i channels: " "%s\n", ad->device, (int)audioFormat->channels, snd_strerror(-err)); goto fail; @@ -222,7 +225,7 @@ static int alsa_openDevice(AudioOutput * audioOutput) err = snd_pcm_hw_params_set_rate_near(ad->pcmHandle, hwparams, &sampleRate, NULL); if (err < 0 || sampleRate == 0) { - ERROR("Alsa device \"%s\" does not support %i Hz audio\n", + ERROR("ALSA device \"%s\" does not support %i Hz audio\n", ad->device, (int)audioFormat->sampleRate); goto fail; } @@ -234,8 +237,7 @@ static int alsa_openDevice(AudioOutput * audioOutput) if (err < 0) goto error; - if (!ad->period_time && sampleRate > 0) - ad->period_time = 1000000 * MPD_ALSA_SAMPLE_XFER / sampleRate; + period_time = ad->period_time; cmd = "snd_pcm_hw_params_set_period_time_near"; err = snd_pcm_hw_params_set_period_time_near(ad->pcmHandle, hwparams, &ad->period_time, NULL); @@ -244,8 +246,13 @@ static int alsa_openDevice(AudioOutput * audioOutput) cmd = "snd_pcm_hw_params"; err = snd_pcm_hw_params(ad->pcmHandle, hwparams); - if (err < 0) + if (err == -EPIPE && --retry > 0) { + ad->period_time = period_time >> 1; + goto configure_hw; + } else if (err < 0) goto error; + if (retry != MPD_ALSA_RETRY_NR) + DEBUG("ALSA period_time set to %d\n", ad->period_time); cmd = "snd_pcm_hw_params_get_buffer_size"; err = snd_pcm_hw_params_get_buffer_size(hwparams, &alsa_buffer_size); |