audio: introduce audio_pcm_hw_clip_out helper function

Signed-off-by: malc <av1474@comtv.ru>

2 files changed, 25 insertions, 0 deletions

diff --git a/audio/audio.c b/audio/audio.c
index a3e23b2..d8e1e15 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -851,6 +851,28 @@ int audio_pcm_hw_get_live_in (HWVoiceIn *hw)
     return live;
 }
 
+int audio_pcm_hw_clip_out (HWVoiceOut *hw, void *pcm_buf,
+                           int live, int pending)
+{
+    int left = hw->samples - pending;
+    int len = audio_MIN (left, live);
+    int clipped = 0;
+
+    while (len) {
+        struct st_sample *src = hw->mix_buf + hw->rpos;
+        uint8_t *dst = advance (pcm_buf, hw->rpos << hw->info.shift);
+        int samples_till_end_of_buf = hw->samples - hw->rpos;
+        int samples_to_clip = audio_MIN (len, samples_till_end_of_buf);
+
+        hw->clip (dst, src, samples_to_clip);
+
+        hw->rpos = (hw->rpos + samples_to_clip) % hw->samples;
+        len -= samples_to_clip;
+        clipped += samples_to_clip;
+    }
+    return clipped;
+}
+
 /*
  * Soft voice (capture)
  */
diff --git a/audio/audio_int.h b/audio/audio_int.h
index ce791ee..7ea8729 100644
--- a/audio/audio_int.h
+++ b/audio/audio_int.h
@@ -221,6 +221,9 @@ int  audio_pcm_sw_read (SWVoiceIn *sw, void *buf, int len);
 int  audio_pcm_hw_get_live_out (HWVoiceOut *hw);
 int  audio_pcm_hw_get_live_out2 (HWVoiceOut *hw, int *nb_live);
 
+int audio_pcm_hw_clip_out (HWVoiceOut *hw, void *pcm_buf,
+                           int live, int pending);
+
 int audio_bug (const char *funcname, int cond);
 void *audio_calloc (const char *funcname, int nmemb, size_t size);