Fix a couple of MP4 demuxing problems, preventing playback in a few cases. All my test files now play properly.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12161 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 3 insertions, 2 deletions

diff --git a/apps/codecs/libm4a/m4a.c b/apps/codecs/libm4a/m4a.c
index 0a87ec35ea..f5aaeca302 100644
--- a/apps/codecs/libm4a/m4a.c
+++ b/apps/codecs/libm4a/m4a.c
@@ -199,7 +199,7 @@ unsigned int get_sample_offset(demux_res_t *demux_res, uint32_t sample)
         prev_chunk_samples = demux_res->sample_to_chunk[i].num_samples;
     }
 
-    if (demux_res->num_sample_to_chunks > 1)
+    if (sample >= demux_res->sample_to_chunk[0].num_samples)
     {
         chunk = prev_chunk + (sample - total_samples) / prev_chunk_samples;
     }
@@ -223,7 +223,8 @@ unsigned int get_sample_offset(demux_res_t *demux_res, uint32_t sample)
         file_offset = demux_res->chunk_offset[chunk - 1];
     }
     
-    if (chunk_sample > sample) {
+    if (chunk_sample > sample) 
+    {
         return 0;
     }