audio: commonize voice initialization

[mirror_qemu.git] / audio / sdlaudio.c

diff --git a/audio/sdlaudio.c b/audio/sdlaudio.c
index 445cae8de578538213cc0388a5a55b405873cb35..4d8473d9ece8159ff183ac68e91bc7f87aa7ba06 100644 (file)
--- a/audio/sdlaudio.c
+++ b/audio/sdlaudio.c
@@ -26,6 +26,7 @@
 #include <SDL.h>
 #include <SDL_thread.h>
 #include "qemu/module.h"
+#include "qapi/error.h"
 #include "audio.h"
 
 #ifndef _WIN32
@@ -55,7 +56,7 @@ typedef struct SDLVoiceIn {
     SDL_AudioDeviceID devid;
 } SDLVoiceIn;
 
-static void GCC_FMT_ATTR (1, 2) sdl_logerr (const char *fmt, ...)
+static void G_GNUC_PRINTF (1, 2) sdl_logerr (const char *fmt, ...)
 {
     va_list ap;
 
@@ -224,12 +225,11 @@ static void sdl_callback_out(void *opaque, Uint8 *buf, int len)
         /* dolog("callback_out: 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;
-            }
-            assert(start >= 0 && start < hw->size_emul);
+            size_t write_len, start;
+
+            start = audio_ring_posb(hw->pos_emul, hw->pending_emul,
+                                    hw->size_emul);
+            assert(start < hw->size_emul);
 
             write_len = MIN(MIN(hw->pending_emul, len),
                             hw->size_emul - start);
@@ -310,6 +310,7 @@ static void sdl_callback_in(void *opaque, Uint8 *buf, int len)
         SDL_UnlockAudioDevice(sdl->devid);                     \
     }
 
+SDL_WRAPPER_FUNC(buffer_get_free, size_t, (HWVoiceOut *hw), (hw), Out)
 SDL_WRAPPER_FUNC(get_buffer_out, void *, (HWVoiceOut *hw, size_t *size),
                  (hw, size), Out)
 SDL_WRAPPER_FUNC(put_buffer_out, size_t,
@@ -347,11 +348,8 @@ static int sdl_init_out(HWVoiceOut *hw, struct audsettings *as,
     req.freq = as->freq;
     req.format = aud_to_sdlfmt (as->fmt);
     req.channels = as->nchannels;
-    /*
-     * This is wrong. SDL samples are QEMU frames. The buffer size will be
-     * the requested buffer size multiplied by the number of channels.
-     */
-    req.samples = audio_buffer_samples(
+    /* SDL samples are QEMU frames */
+    req.samples = audio_buffer_frames(
         qapi_AudiodevSdlPerDirectionOptions_base(spdo), as, 11610);
     req.callback = sdl_callback_out;
     req.userdata = sdl;
@@ -452,10 +450,10 @@ static void sdl_enable_in(HWVoiceIn *hw, bool enable)
     SDL_PauseAudioDevice(sdl->devid, !enable);
 }
 
-static void *sdl_audio_init(Audiodev *dev)
+static void *sdl_audio_init(Audiodev *dev, Error **errp)
 {
     if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
-        sdl_logerr ("SDL failed to initialize audio subsystem\n");
+        error_setg(errp, "SDL failed to initialize audio subsystem");
         return NULL;
     }
 
@@ -472,6 +470,8 @@ static struct audio_pcm_ops sdl_pcm_ops = {
     .fini_out = sdl_fini_out,
   /* wrapper for audio_generic_write */
     .write    = sdl_write,
+  /* wrapper for audio_generic_buffer_get_free */
+    .buffer_get_free = sdl_buffer_get_free,
   /* wrapper for audio_generic_get_buffer_out */
     .get_buffer_out = sdl_get_buffer_out,
   /* wrapper for audio_generic_put_buffer_out */
@@ -495,8 +495,8 @@ static struct audio_driver sdl_audio_driver = {
     .fini           = sdl_audio_fini,
     .pcm_ops        = &sdl_pcm_ops,
     .can_be_default = 1,
-    .max_voices_out = 1,
-    .max_voices_in  = 1,
+    .max_voices_out = INT_MAX,
+    .max_voices_in  = INT_MAX,
     .voice_size_out = sizeof(SDLVoiceOut),
     .voice_size_in  = sizeof(SDLVoiceIn),
 };