We should only copy when there is data, as we are using pulling mode, should sink side should have free space always, we check each source->avail and copy only some bytes when avail < period size.
Signed-off-by: Keyon Jie yang.jie@linux.intel.com --- src/audio/mixer.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-)
diff --git a/src/audio/mixer.c b/src/audio/mixer.c index 57669a7..2d021b7 100644 --- a/src/audio/mixer.c +++ b/src/audio/mixer.c @@ -214,7 +214,7 @@ static int mixer_copy(struct comp_dev *dev) { struct mixer_data *md = comp_get_drvdata(dev); struct comp_buffer *sink, *sources[5], *source; - uint32_t i = 0, cframes = PLAT_INT_PERIOD_FRAMES; + uint32_t i = 0, mixing_num, cframes = PLAT_INT_PERIOD_FRAMES; struct list_item * blist;
trace_mixer("Mix"); @@ -227,13 +227,31 @@ static int mixer_copy(struct comp_dev *dev) sources[i++] = source; }
+ mixing_num = i; + sink = list_first_item(&dev->bsink_list, struct comp_buffer, source_list);
+ for(i = 0; i < mixing_num; i++) { + if (sources[i]->avail < cframes * sources[i]->params.frame_size) + cframes = sources[i]->avail /sources[i]->params.frame_size; + } + if (sink->free < cframes * sink->params.frame_size) + cframes = sink->free /sink->params.frame_size; + + if (mixing_num == 0) + cframes = 0; + + /* no frames to mix */ + if (cframes == 0) { + trace_value(cframes); + return 0; + } + /* mix streams */ md->mix_func(dev, sink, sources, i, cframes);
/* update buffer pointers for overflow */ - for(; i > 0; i--) { + for(i = mixing_num; i > 0; i--) { if (sources[i-1]->r_ptr >= sources[i-1]->end_addr) sources[i-1]->r_ptr = sources[i-1]->addr; comp_update_buffer_consume(sources[i-1]); @@ -260,6 +278,7 @@ static int mixer_reset(struct comp_dev *dev) return 1; /* should not reset the downstream components */ }
+ dev->state = COMP_STATE_INIT; return 0; }