diff mbox series

[PULL,05/30] sdlaudio: always clear the sample buffer

Message ID 20210115132146.1443592-6-kraxel@redhat.com
State New
Headers show
Series [PULL,01/30] sdlaudio: remove leftover SDL1.2 code | expand

Commit Message

Gerd Hoffmann Jan. 15, 2021, 1:21 p.m. UTC 
From: Volker Rümelin <vr_qemu@t-online.de>

Always fill the remaining audio callback buffer with silence.
SDL 2.0 doesn't initialize the audio callback buffer. This was
an incompatible change compared to SDL 1.2. For reference read
the SDL 1.2 to 2.0 migration guide.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 9315afe5-5958-c0b4-ea1e-14769511a9d5@t-online.de
Message-Id: <20210110100239.27588-5-vr_qemu@t-online.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 audio/sdlaudio.c | 35 +++++++++++++++++------------------
 1 file changed, 17 insertions(+), 18 deletions(-)
diff mbox series

Patch

diff --git a/audio/sdlaudio.c b/audio/sdlaudio.c
index 68126a99ab32..79eed23849ea 100644
--- a/audio/sdlaudio.c
+++ b/audio/sdlaudio.c
@@ -211,27 +211,26 @@  static void sdl_callback (void *opaque, Uint8 *buf, int len)
     SDLAudioState *s = &glob_sdl;
     HWVoiceOut *hw = &sdl->hw;
 
-    if (s->exit) {
-        return;
-    }
+    if (!s->exit) {
 
-    /* dolog("callback: len=%d avail=%zu\n", len, hw->pending_emul); */
+        /* dolog("callback: len=%d avail=%zu\n", len, hw->pending_emul); */
 
-    while (hw->pending_emul && len) {
-        size_t write_len;
-        ssize_t start = ((ssize_t) hw->pos_emul) - hw->pending_emul;
-        if (start < 0) {
-            start += hw->size_emul;
+        while (hw->pending_emul && len) {
+            size_t write_len;
+            ssize_t start = (ssize_t)hw->pos_emul - hw->pending_emul;
+            if (start < 0) {
+                start += hw->size_emul;
+            }
+            assert(start >= 0 && start < hw->size_emul);
+
+            write_len = MIN(MIN(hw->pending_emul, len),
+                            hw->size_emul - start);
+
+            memcpy(buf, hw->buf_emul + start, write_len);
+            hw->pending_emul -= write_len;
+            len -= write_len;
+            buf += write_len;
         }
-        assert(start >= 0 && start < hw->size_emul);
-
-        write_len = MIN(MIN(hw->pending_emul, len),
-                        hw->size_emul - start);
-
-        memcpy(buf, hw->buf_emul + start, write_len);
-        hw->pending_emul -= write_len;
-        len -= write_len;
-        buf += write_len;
     }
 
     /* clear remaining buffer that we couldn't fill with data */