Added direct_write transfer method

diff --git a/test/pcm.c b/test/pcm.c
index c40a218bb329f06629496d59025929bd328bf72a..997b3928d81a42f23064940bdb1d3f8be054b91c 100644 (file)
--- a/test/pcm.c
+++ b/test/pcm.c
@@ -419,6 +419,39 @@ static int direct_loop(snd_pcm_t *handle,
        }
 }
  
+/*
+ *   Transfer method - direct write only using mmap_write functions
+ */
+
+static int direct_write_loop(snd_pcm_t *handle,
+                            signed short *samples,
+                            snd_pcm_channel_area_t *areas)
+{
+       double phase = 0;
+       signed short *ptr;
+       int err, cptr;
+
+       while (1) {
+               generate_sine(areas, 0, period_size, &phase);
+               ptr = samples;
+               cptr = period_size;
+               while (cptr > 0) {
+                       err = snd_pcm_mmap_writei(handle, ptr, cptr);
+                       if (err == -EAGAIN)
+                               continue;
+                       if (err < 0) {
+                               if (xrun_recovery(handle, err) < 0) {
+                                       printf("Write error: %s\n", snd_strerror(err));
+                                       exit(EXIT_FAILURE);
+                               }
+                               break;  /* skip one period */
+                       }
+                       ptr += err * channels;
+                       cptr -= err;
+               }
+       }
+}
+ 
 /*
  *
  */
@@ -437,6 +470,7 @@ static struct transfer_method transfer_methods[] = {
        { "async", SND_PCM_ACCESS_RW_INTERLEAVED, async_loop },
        { "direct_interleaved", SND_PCM_ACCESS_MMAP_INTERLEAVED, direct_loop },
        { "direct_noninterleaved", SND_PCM_ACCESS_MMAP_NONINTERLEAVED, direct_loop },
+       { "direct_write", SND_PCM_ACCESS_MMAP_INTERLEAVED, direct_write_loop },
        { NULL, SND_PCM_ACCESS_RW_INTERLEAVED, NULL }
 };