e200v1/c200v1: Implement limited samplerate switching. Rates 24kHz and below are being a bear as far as minor crackling at higher amplitude-- leave them out for the time being since no solution is currently evident. 48, 44, 32 (rec rates 24, 22, 16) seem perfectly fine. I'm betting c200 is ok to include because it uses the same setup as e200.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27139 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 18 insertions, 2 deletions

diff --git a/firmware/pcm.c b/firmware/pcm.c
index 8080823077..72fe23cb16 100644
--- a/firmware/pcm.c
+++ b/firmware/pcm.c
@@ -361,8 +361,24 @@ void pcm_set_frequency(unsigned int samplerate)
 {
     logf("pcm_set_frequency");
 
-    int index = round_value_to_list32(samplerate, hw_freq_sampr,
-                                      HW_NUM_FREQ, false);
+    int index;
+
+#ifdef CONFIG_SAMPR_TYPES
+    unsigned int type = samplerate & SAMPR_TYPE_MASK;
+    samplerate &= ~SAMPR_TYPE_MASK;
+
+#ifdef SAMPR_TYPE_REC
+    /* For now, supported targets have direct conversion when configured with
+     * CONFIG_SAMPR_TYPES.
+     * Some hypothetical target with independent rates would need slightly
+     * different handling throughout this source. */
+    if (type == SAMPR_TYPE_REC)
+        samplerate = pcm_sampr_type_rec_to_play(samplerate);
+#endif
+#endif /* CONFIG_SAMPR_TYPES */
+
+    index = round_value_to_list32(samplerate, hw_freq_sampr,
+                                  HW_NUM_FREQ, false);
 
     if (samplerate != hw_freq_sampr[index])
         index = HW_FREQ_DEFAULT; /* Invalid = default */