Let WM8750 users write to audio buffer directly.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4254 c046a42c-6fe2-441c-8c8c-71466251a162

hw/i2c.h

@@ -67,6 +67,8 @@ void wm8750_data_req_set(i2c_slave *i2c,
                 void (*data_req)(void *, int, int), void *opaque);
 void wm8750_dac_dat(void *opaque, uint32_t sample);
 uint32_t wm8750_adc_dat(void *opaque);
+void *wm8750_dac_buffer(void *opaque, int samples);
+void wm8750_dac_commit(void *opaque);
 
 /* ssd0303.c */
 void ssd0303_init(DisplayState *ds, i2c_bus *bus, int address);

hw/musicpal.c

@@ -254,7 +254,7 @@ typedef struct musicpal_audio_state {
 static void audio_callback(void *opaque, int free_out, int free_in)
 {
     musicpal_audio_state *s = opaque;
-    int16_t channel[2];
+    int16_t *codec_buffer;
     int pos, block_size;
 
     if (!(s->playback_mode & MP_AUDIO_PLAYBACK_EN))
@@ -270,17 +270,19 @@ static void audio_callback(void *opaque, int free_out, int free_in)
         return;
 
     if (s->playback_mode & MP_AUDIO_16BIT_SAMPLE)
-        for (pos = 0; pos < block_size; pos += 4)
+        memcpy(wm8750_dac_buffer(s->wm, block_size >> 2), 
-            wm8750_dac_dat(s->wm,
+               (uint32_t *)(s->target_buffer + s->play_pos),
-                    *(uint32_t *)(s->target_buffer + s->play_pos + pos));
+               block_size);
-    else
+    else {
+        codec_buffer = wm8750_dac_buffer(s->wm, block_size >> 1);
         for (pos = 0; pos < block_size; pos += 2) {
-            channel[0] = cpu_to_le16(2 *
+            *codec_buffer++ = cpu_to_le16(2 *
                     *(int8_t *)(s->target_buffer + s->play_pos + pos));
-            channel[1] = cpu_to_le16(2 *
+            *codec_buffer++ = cpu_to_le16(2 *
                     *(int8_t *)(s->target_buffer + s->play_pos + pos + 1));
-            wm8750_dac_dat(s->wm, channel[0] | (channel[1] << 16));
         }
+    }
+    wm8750_dac_commit(s->wm);
 
     s->last_free = free_out - block_size;
 

hw/wm8750.c

@@ -627,6 +627,24 @@ void wm8750_dac_dat(void *opaque, uint32_t sample)
         wm8750_out_flush(s);
 }
 
+void *wm8750_dac_buffer(void *opaque, int samples)
+{
+    struct wm8750_s *s = (struct wm8750_s *) opaque;
+    /* XXX: Should check if there are <i>samples</i> free samples available */
+    void *ret = s->data_out + s->idx_out;
+
+    s->idx_out += samples << 2;
+    s->req_out -= samples << 2;
+    return ret;
+}
+
+void wm8750_dac_commit(void *opaque)
+{
+    struct wm8750_s *s = (struct wm8750_s *) opaque;
+
+    return wm8750_out_flush(s);
+}
+
 uint32_t wm8750_adc_dat(void *opaque)
 {
     struct wm8750_s *s = (struct wm8750_s *) opaque;