From 6ed533f56137f678ff8507012de14d277aded9cc Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Wed, 22 Jun 2011 15:33:56 -0400 Subject: [PATCH] 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. (cherry picked from commit 8bfd7f6a475225a0595bf657f8b99a8fffb461e4) Signed-off-by: Anton Khirnov --- libavdevice/alsa-audio-common.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libavdevice/alsa-audio-common.c b/libavdevice/alsa-audio-common.c index baa6ac79ca..4c7c881300 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",