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alsa: fallback to buffer_size/4 for period_size. 

buffer_size/4 is the value used by aplay. This fixes output to null
devices, e.g. writing ALSA output to a file.
This commit is contained in:
Justin Ruggles 2011-06-22 15:33:56 -04:00
parent 4c98976124
commit 8bfd7f6a47
1 changed files with 2 additions and 0 deletions
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2
libavdevice/alsa-audio-common.c
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@ -269,6 +269,8 @@ av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode,
}
snd_pcm_hw_params_get_period_size_min(hw_params, &period_size, NULL);
if (!period_size)
period_size = buffer_size / 4;
res = snd_pcm_hw_params_set_period_size_near(h, hw_params, &period_size, NULL);
if (res < 0) {
av_log(ctx, AV_LOG_ERROR, "cannot set ALSA period size (%s)\n",