Commit work started in FS#12153 to put timing/position information in PCM

buffer chunks.

* Samples and position indication is closely associated with audio data
  instead of compensating by a latency constant. Alleviates problems with
  using the elapsed as a track indicator where it could be off by several
  steps.

* Timing is accurate throughout track even if resampling for pitch shift,
  whereas before it updated during transition latency at the normal 1:1 rate.

* Simpler PCM buffer with a constant chunk size, no linked lists.

In converting crossfade, a minor change was made to not change the WPS until
the fade-in of the incoming track, whereas before it would change upon the
start of the fade-out of the outgoing track possibly having the WPS change
with far too much lead time.

Codec changes are to set elapsed times *before* writing next PCM frame because
 time and position data last set are saved in the next committed PCM chunk. 


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30366 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 4 insertions, 0 deletions

diff --git a/firmware/export/system.h b/firmware/export/system.h
index 5128801725..1f8ed033fd 100644
--- a/firmware/export/system.h
+++ b/firmware/export/system.h
@@ -378,12 +378,16 @@ static inline void cpucache_flush(void)
 #if   defined(CPU_ARM)
     /* Use ARMs cache alignment. */
     #define MEM_ALIGN_ATTR CACHEALIGN_ATTR
+    #define MEM_ALIGN_SIZE CACHEALIGN_SIZE
 #elif defined(CPU_COLDFIRE)
     /* Use fixed alignment of 16 bytes. Speed up only for 'movem' in DRAM. */
     #define MEM_ALIGN_ATTR __attribute__((aligned(16)))
+    #define MEM_ALIGN_SIZE 16
 #else
     /* Do nothing. */
     #define MEM_ALIGN_ATTR
+    /* Align pointer size */
+    #define MEM_ALIGN_SIZE sizeof(intptr_t)
 #endif
 
 #ifdef STORAGE_WANTS_ALIGN