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/apps/codecs/mpc.c b/apps/codecs/mpc.c
index 7388799ee8..a405c72f79 100644
--- a/apps/codecs/mpc.c
+++ b/apps/codecs/mpc.c
@@ -123,6 +123,8 @@ enum codec_status codec_run(void)
     codec_set_replaygain(ci->id3);
 
     /* Resume to saved sample offset. */
+    elapsed_time = 0;
+
     if (samplesdone > 0) 
     {
         if (mpc_demux_seek_sample(demux, samplesdone) == MPC_STATUS_OK) 
@@ -136,6 +138,8 @@ enum codec_status codec_run(void)
         }
     }
 
+    ci->set_elapsed(elapsed_time);
+
     /* This is the decoding loop. */
     do 
     {