rbcodec: Hooks for target specific functions in dsp_process loop

Use them to move tick counting, yielding and coldfire macsr handling
code to a rockbox specific file.

Change-Id: Id7417dc98c08a342eba45ba56b044a276e50564b
Reviewed-on: http://gerrit.rockbox.org/229
Tested-by: Nils Wallménius <nils@rockbox.org>
Reviewed-by: Nils Wallménius <nils@rockbox.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/apps/rbcodecconfig.h b/apps/rbcodecconfig.h
index 6c7a074..ff9fc41 100644
--- a/apps/rbcodecconfig.h
+++ b/apps/rbcodecconfig.h
@@ -17,6 +17,58 @@
  * {,U}INT{8,16,32,64}_{MIN,MAX} */
 #include "system.h"
 
+/* Structure to record some info during processing call */
+struct dsp_loop_context
+{
+    long last_yield;
+#ifdef CPU_COLDFIRE
+    unsigned long old_macsr;
+#endif
+};
+
+static inline void dsp_process_start(struct dsp_loop_context *ctx)
+{
+    /* At least perform one yield before starting */
+    ctx->last_yield = current_tick;
+    yield();
+#if defined(CPU_COLDFIRE)
+    /* set emac unit for dsp processing, and save old macsr, we're running in
+       codec thread context at this point, so can't clobber it */
+    ctx->old_macsr = coldfire_get_macsr();
+    coldfire_set_macsr(EMAC_FRACTIONAL | EMAC_SATURATE);
+#endif
+}
+
+static inline void dsp_process_loop(struct dsp_loop_context *ctx)
+{
+    /* Yield at least once each tick */
+    long tick = current_tick;
+    if (TIME_AFTER(tick, ctx->last_yield))
+    {
+        ctx->last_yield = tick;
+        yield();
+    }
+}
+
+static inline void dsp_process_end(struct dsp_loop_context *ctx)
+{
+#if defined(CPU_COLDFIRE)
+    /* set old macsr again */
+    coldfire_set_macsr(ctx->old_macsr);
+#endif
+    (void)ctx;
+}
+
+#define DSP_PROCESS_START() \
+    struct dsp_loop_context __ctx; \
+    dsp_process_start(&__ctx)
+
+#define DSP_PROCESS_LOOP() \
+    dsp_process_loop(&__ctx)
+
+#define DSP_PROCESS_END() \
+    dsp_process_end(&__ctx)
+
 #endif
 
 #endif