From 7ad2cad173ffa094bb285112582afee1c9aea4e5 Mon Sep 17 00:00:00 2001 From: Michael Sevakis Date: Sun, 28 Aug 2011 07:45:35 +0000 Subject: 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 --- firmware/export/system.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'firmware/export/system.h') 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 -- cgit v1.2.3