buffer_size/4 is the value used by aplay. This fixes output to null
devices, e.g. writing ALSA output to a file.
---
libavdevice/alsa-audio-common.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/libavdevice/alsa-audio-common.c b/libavdevice/alsa-audio-common.c
index baa6ac7..4c7c881 100644
--- a/libavdevice/alsa-audio-common.c
+++ b/libavdevice/alsa-audio-common.c
@@ -146,6 +146,8 @@ 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",
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