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, 6 insertions, 1 deletions

diff --git a/apps/codecs/adx.c b/apps/codecs/adx.c
index e75e7dca1e..8144d5f468 100644
--- a/apps/codecs/adx.c
+++ b/apps/codecs/adx.c
@@ -209,7 +209,7 @@ enum codec_status codec_run(void)
 
     /* get in position */
     ci->seek_buffer(bufoff);
-
+    ci->set_elapsed(0);
 
     /* setup pcm buffer format */
     ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
@@ -276,6 +276,11 @@ enum codec_status codec_run(void)
                 loop_count++;
             }
             ci->seek_buffer(bufoff);
+
+            ci->set_elapsed(
+               ((end_adr-start_adr)*loop_count + bufoff-chanstart)*
+               1000LL/avgbytespersec);
+
             ci->seek_complete();
         }