diff options
Diffstat (limited to 'apps/codecs/libm4a/m4a.c')
| -rw-r--r-- | apps/codecs/libm4a/m4a.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/apps/codecs/libm4a/m4a.c b/apps/codecs/libm4a/m4a.c index 836cdafda3..84144ea76c 100644 --- a/apps/codecs/libm4a/m4a.c +++ b/apps/codecs/libm4a/m4a.c @@ -124,10 +124,14 @@ void stream_create(stream_t *stream,struct codec_api* ci) /* Check if there is a dedicated byte position contained for the given frame. * Return this byte position in case of success or return -1. This allows to - * skip empty samples. */ -int m4a_check_sample_offset(demux_res_t *demux_res, uint32_t frame) + * skip empty samples. + * During standard playback the search result (index i) will always increase. + * Therefor we save this index and let the caller set this value again as start + * index when calling m4a_check_sample_offset() for the next frame. This + * reduces the overall loop count significantly. */ +int m4a_check_sample_offset(demux_res_t *demux_res, uint32_t frame, uint32_t *start) { - uint32_t i = 0; + uint32_t i = *start; for (i=0; i<demux_res->num_lookup_table; ++i) { if (demux_res->lookup_table[i].sample > frame || @@ -136,6 +140,7 @@ int m4a_check_sample_offset(demux_res_t *demux_res, uint32_t frame) if (demux_res->lookup_table[i].sample == frame) break; } + *start = i; return demux_res->lookup_table[i].offset; } |