Changeset ed3f8d5 in mainline for uspace/drv/audio/sb16/dsp.c

Timestamp:

2011-11-30T21:58:26Z (12 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

5c62b5f

Parents:

413225d

Message:

sb16: Rework AUTO_DMA_MODE

File:

• uspace/drv/audio/sb16/dsp.c (modified) (7 diffs)

uspace/drv/audio/sb16/dsp.c

@@ -56 +56 @@
 #define AUTO_DMA_MODE
 
-#ifdef AUTO_DMA_MODE
-#undef AUTO_DMA_MODE
-#define AUTO_DMA_MODE true
-#else
-#define AUTO_DMA_MODE false
-#endif
-
 static inline int sb_dsp_read(sb_dsp_t *dsp, uint8_t *data)
 {
@@ -198 +191 @@
 
         if (remain_size == 0) {
+#ifdef AUTO_DMA_MODE
+                sb_dsp_write(dsp, DMA_16B_EXIT);
+#endif
                 ddf_log_note("Nothing more to play");
-                if (AUTO_DMA_MODE) {
-                        sb_dsp_write(dsp, DMA_16B_EXIT);
-                }
                 sb_clear_buffer(dsp);
                 return;
@@ -220 +213 @@
                 return;
         }
+        /* Copy new data */
         memcpy(dsp->buffer.position, dsp->playing.position, PLAY_BLOCK_SIZE);
         write_barrier();
+        /* Adjust position */
         dsp->playing.position += PLAY_BLOCK_SIZE;
         dsp->buffer.position += PLAY_BLOCK_SIZE;
@@ -227 +222 @@
         if (dsp->buffer.position == (dsp->buffer.data + dsp->buffer.size))
                 dsp->buffer.position = dsp->buffer.data;
-        if (!AUTO_DMA_MODE) {
-                sb_dsp_write(dsp, SINGLE_DMA_16B_DA_FIFO);
-                sb_dsp_write(dsp, dsp->playing.mode);
-                sb_dsp_write(dsp, (PLAY_BLOCK_SIZE - 1) & 0xff);
-                sb_dsp_write(dsp, (PLAY_BLOCK_SIZE - 1) >> 8);
-        }
+#ifndef AUTO_DMA_MODE
+        const size_t samples = sample_count(dsp->playing.mode, PLAY_BLOCK_SIZE);
+        sb_dsp_write(dsp, SINGLE_DMA_16B_DA_FIFO);
+        sb_dsp_write(dsp, dsp->playing.mode);
+        sb_dsp_write(dsp, (samples - 1) & 0xff);
+        sb_dsp_write(dsp, (samples - 1) >> 8);
+#endif
 
 }
@@ -270 +266 @@
                 return ret;
 
+        const size_t copy_size = size < BUFFER_SIZE ? size : BUFFER_SIZE;
         const size_t play_size =
             size < PLAY_BLOCK_SIZE ? size : PLAY_BLOCK_SIZE;
-        const size_t copy_size =
-            size < BUFFER_SIZE ? size : BUFFER_SIZE;
 
         dsp->playing.data = data;
@@ -279 +274 @@
         dsp->playing.size = size;
         dsp->playing.mode = 0;
+
         if (sample_size == 16)
                 dsp->playing.mode |= DSP_MODE_16BIT;
@@ -299 +295 @@
             sampling_rate >> 8, sampling_rate & 0xff);
 
-        if (!AUTO_DMA_MODE || play_size == size) {
+#ifdef AUTO_DMA_MODE
+        if (play_size < size) {
+                sb_dsp_write(dsp, AUTO_DMA_16B_DA_FIFO);
+        } else {
                 sb_dsp_write(dsp, SINGLE_DMA_16B_DA_FIFO);
-        } else {
-                sb_dsp_write(dsp, AUTO_DMA_16B_DA_FIFO);
-        }
+        }
+#else
+        sb_dsp_write(dsp, SINGLE_DMA_16B_DA_FIFO);
+#endif
+
         sb_dsp_write(dsp, dsp->playing.mode);
         sb_dsp_write(dsp, (samples - 1) & 0xff);