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| author | Eric Wong <normalperson@yhbt.net> | 2008-09-10 19:36:13 -0700 |
|---|---|---|
| committer | Eric Wong <normalperson@yhbt.net> | 2008-09-10 19:37:50 -0700 |
| commit | 1b6315e8f6372e7abe1a3eb08b27b2f331aa2728 (patch) | |
| tree | 21620303d5b2dcf9f2e9640695fe352cc18f68d5 /src | |
| parent | 8ea40fae6181d788b0900aa6c77c3cdb1e9b5992 (diff) | |
| download | mpd-1b6315e8f6372e7abe1a3eb08b27b2f331aa2728.tar.gz mpd-1b6315e8f6372e7abe1a3eb08b27b2f331aa2728.tar.xz mpd-1b6315e8f6372e7abe1a3eb08b27b2f331aa2728.zip | |
alsa: re-enable-nonblocking, but sleep if busy
Instead of letting ALSA block for us (and potentially allowing
something stupid on certain hardware or drivers), we do the
sleeping ourselves. We calculate the sleep to be a fraction of
period_time to avoid oversleeping (and thus audible skipping).
Diffstat (limited to '')
| -rw-r--r-- | src/audioOutputs/audioOutput_alsa.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/src/audioOutputs/audioOutput_alsa.c b/src/audioOutputs/audioOutput_alsa.c index b7b0a1151..06dbeb956 100644 --- a/src/audioOutputs/audioOutput_alsa.c +++ b/src/audioOutputs/audioOutput_alsa.c @@ -38,9 +38,6 @@ static const char default_device[] = "default"; #include <alsa/asoundlib.h> -/* #define MPD_SND_PCM_NONBLOCK SND_PCM_NONBLOCK */ -#define MPD_SND_PCM_NONBLOCK 0 - /* * This macro will evaluate both statements, but only returns the result * of the second statement to the reader. Thus it'll stringify the @@ -65,6 +62,7 @@ typedef struct _AlsaData { alsa_writei_t *writei; unsigned int buffer_time; unsigned int period_time; + unsigned int period_sleep; int sampleSize; int useMmap; } AlsaData; @@ -175,16 +173,14 @@ static int alsa_openDevice(AudioOutput * audioOutput) ad->device, audioFormat->bits); err = E(snd_pcm_open, &ad->pcmHandle, ad->device, - SND_PCM_STREAM_PLAYBACK, MPD_SND_PCM_NONBLOCK); + SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK); if (err < 0) { ad->pcmHandle = NULL; goto error; } -#if MPD_SND_PCM_NONBLOCK == SND_PCM_NONBLOCK if ((err = E(snd_pcm_nonblock, ad->pcmHandle, 0)) < 0) goto error; -#endif /* MPD_SND_PCM_NONBLOCK == SND_PCM_NONBLOCK */ period_time_ro = period_time = ad->period_time; configure_hw: @@ -250,6 +246,7 @@ configure_hw: } else if (err < 0) goto error; + ad->period_sleep = period_time >> 1; DEBUG("ALSA(%s) period_time: %u, buffer_time: %u\n", ad->device, period_time, buffer_time); if ((err = E(snd_pcm_hw_params_get_buffer_size, hwparams, @@ -376,7 +373,12 @@ static int alsa_playAudio(AudioOutput * audioOutput, while (size > 0) { ret = ad->writei(ad->pcmHandle, playChunk, size); - if (ret == -EAGAIN || ret == -EINTR) + if (ret == -EAGAIN) { + DEBUG("ALSA busy, sleeping %d\n", ad->period_sleep); + my_usleep(ad->period_sleep); + continue; + } + if (ret == -EINTR) continue; if (ret < 0) { |