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| author | Eric Wong <normalperson@yhbt.net> | 2006-08-12 18:20:55 +0000 |
|---|---|---|
| committer | Eric Wong <normalperson@yhbt.net> | 2006-08-12 18:20:55 +0000 |
| commit | 0511e14db09698c9665a2c8fe299235f1242d9ea (patch) | |
| tree | 27d880bc5a5776318a0715561ccd67917a51c52d /src/audioOutputs/audioOutput_alsa.c | |
| parent | b5361f7789e560701b333bf27a2768c0a58c7576 (diff) | |
| download | mpd-0511e14db09698c9665a2c8fe299235f1242d9ea.tar.gz mpd-0511e14db09698c9665a2c8fe299235f1242d9ea.tar.xz mpd-0511e14db09698c9665a2c8fe299235f1242d9ea.zip | |
audioOutput_alsa.c: avoid changing our internal period and buffer time values
Passing a ref to snd_pcm_hw_params_set_{buffer,period}_time_near
can modify our internal {period,buffer}_time members inside the
AlsaData structure, making re-initializing the device across
sample/bit rate and channel changes non-idempotent.
git-svn-id: https://svn.musicpd.org/mpd/trunk@4616 09075e82-0dd4-0310-85a5-a0d7c8717e4f
Diffstat (limited to 'src/audioOutputs/audioOutput_alsa.c')
| -rw-r--r-- | src/audioOutputs/audioOutput_alsa.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/src/audioOutputs/audioOutput_alsa.c b/src/audioOutputs/audioOutput_alsa.c index c129e2d6e..9aefb4be8 100644 --- a/src/audioOutputs/audioOutput_alsa.c +++ b/src/audioOutputs/audioOutput_alsa.c @@ -140,8 +140,9 @@ static int alsa_openDevice(AudioOutput * audioOutput) snd_pcm_uframes_t alsa_period_size; int err; const char *cmd = NULL; - unsigned int period_time; int retry = MPD_ALSA_RETRY_NR; + unsigned int period_time, period_time_ro; + unsigned int buffer_time; switch (audioFormat->bits) { case 8: @@ -175,6 +176,7 @@ static int alsa_openDevice(AudioOutput * audioOutput) if (err < 0) goto error; + period_time_ro = period_time = ad->period_time; configure_hw: /* configure HW params */ snd_pcm_hw_params_alloca(&hwparams); @@ -231,28 +233,29 @@ configure_hw: } audioFormat->sampleRate = sampleRate; + buffer_time = ad->buffer_time; cmd = "snd_pcm_hw_params_set_buffer_time_near"; err = snd_pcm_hw_params_set_buffer_time_near(ad->pcmHandle, hwparams, - &ad->buffer_time, NULL); + &buffer_time, NULL); if (err < 0) goto error; - period_time = ad->period_time; + period_time = period_time_ro; 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); + &period_time, NULL); if (err < 0) goto error; cmd = "snd_pcm_hw_params"; err = snd_pcm_hw_params(ad->pcmHandle, hwparams); if (err == -EPIPE && --retry > 0) { - ad->period_time = period_time >> 1; + period_time_ro = period_time_ro >> 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); + DEBUG("ALSA period_time set to %d\n", period_time); cmd = "snd_pcm_hw_params_get_buffer_size"; err = snd_pcm_hw_params_get_buffer_size(hwparams, &alsa_buffer_size); |