[PULL 3/9] audio/spiceaudio: always rate limit playback stream

[Gerd Hoffmann <kraxel@redhat.com>]

From: Volker Rümelin <vr_qemu@t-online.de>

The playback rate with the spiceaudio backend is currently too
fast if there's no spice client connected or the spice client
can't play audio. Rate limit the audio playback stream in all
cases. To calculate the rate correctly the limiter has to know
the maximum buffer size.

Fixes: 8c198ff065 ("spiceaudio: port to the new audio backend api")
Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-id: 20200920171729.15861-3-vr_qemu@t-online.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 audio/audio.c      |  3 ++-
 audio/spiceaudio.c | 10 ++++------
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/audio/audio.c b/audio/audio.c
index 7b660dd0c4d0..d5891e1928bc 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -1089,7 +1089,8 @@ static size_t audio_pcm_hw_run_out(HWVoiceOut *hw, size_t live)
     size_t clipped = 0;
 
     while (live) {
-        size_t size, decr, proc;
+        size_t size = live * hw->info.bytes_per_frame;
+        size_t decr, proc;
         void *buf = hw->pcm_ops->get_buffer_out(hw, &size);
 
         if (size == 0) {
diff --git a/audio/spiceaudio.c b/audio/spiceaudio.c
index c8d81ba44290..c062742622e4 100644
--- a/audio/spiceaudio.c
+++ b/audio/spiceaudio.c
@@ -130,13 +130,11 @@ static void *line_out_get_buffer(HWVoiceOut *hw, size_t *size)
     }
 
     if (out->frame) {
-        *size = audio_rate_get_bytes(
-            &hw->info, &out->rate,
-            (out->fsize - out->fpos) * hw->info.bytes_per_frame);
-    } else {
-        audio_rate_start(&out->rate);
-        *size = LINE_OUT_SAMPLES << 2;
+        *size = MIN((out->fsize - out->fpos) << 2, *size);
     }
+
+    *size = audio_rate_get_bytes(&hw->info, &out->rate, *size);
+
     return out->frame + out->fpos;
 }
 
-- 
2.27.0