Enable setting of global output samplerate on certain targets.

Replaces the NATIVE_FREQUENCY constant with a configurable frequency.

The user may select 48000Hz if the hardware supports it. The default is
still 44100Hz and the minimum is 44100Hz. The setting is located in the
playback settings, under "Frequency".

"Frequency" was duplicated in english.lang for now to avoid having to
fix every .lang file for the moment and throwing everything out of sync
because of the new play_frequency feature in features.txt. The next
cleanup should combine it with the one included for recording and
generalize the ID label.

If the hardware doesn't support 48000Hz, no setting will be available.

On particular hardware where very high rates are practical and desireable,
the upper bound can be extended by patching.

The PCM mixer can be configured to play at the full hardware frequency
range. The DSP core can configure to the hardware minimum up to the
maximum playback setting (some buffers must be reserved according to
the maximum rate).

If only 44100Hz is supported or possible on a given target for playback,
using the DSP and mixer at other samperates is possible if the hardware
offers them.

Change-Id: I6023cf0c0baa8bc6292b6919b4dd3618a6a25622
Reviewed-on: http://gerrit.rockbox.org/479
Reviewed-by: Michael Sevakis <jethead71@rockbox.org>
Tested-by: Michael Sevakis <jethead71@rockbox.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/firmware/export/config_caps.h b/firmware/export/config_caps.h
index fcb13debfc..bc0a42bedf 100644
--- a/firmware/export/config_caps.h
+++ b/firmware/export/config_caps.h
@@ -116,3 +116,37 @@
 #endif
 
 #endif /* HAVE_RECORDING */
+
+/* Samplerate config */
+#define PCM_SAMPR_CONFIG_ONLY /* no C code */
+#include "pcm_sampr.h"
+#undef PCM_SAMPR_CONFIG_ONLY
+
+#define PLAY_SAMPR_CAPS (HW_SAMPR_CAPS & (SAMPR_CAP_44 | SAMPR_CAP_48))
+/**
+ * PLAY_SAMPR_MIN:     The minimum allowable samplerate for global playback.
+ *                     Music won't play at a lower rate.
+ * PLAY_SAMPR_MAX:     The maximum allowable samplerate for global playback.
+ *                     Music won't play at a faster rate.
+ * PLAY_SAMPR_DEFAULT: The default samplerate, unless configured otherwise.
+ * PLAY_SAMPR_HW_MIN:  The minimum allowable rate for some subsystems such
+ *                     as the DSP core. DSP never exceeds *MAX to lessen
+ *                     buffer allocation demands and overhead.
+ */
+#if PLAY_SAMPR_CAPS & (PLAY_SAMPR_CAPS - 1)
+#define HAVE_PLAY_FREQ
+# define PLAY_SAMPR_MIN     SAMPR_44
+# define PLAY_SAMPR_MAX     SAMPR_48
+# define PLAY_SAMPR_DEFAULT SAMPR_44
+# define PLAY_SAMPR_HW_MIN  HW_SAMPR_MIN
+#elif PLAY_SAMPR_CAPS & SAMPR_CAP_44
+# define PLAY_SAMPR_MIN     SAMPR_44
+# define PLAY_SAMPR_MAX     SAMPR_44
+# define PLAY_SAMPR_DEFAULT SAMPR_44
+# define PLAY_SAMPR_HW_MIN  HW_SAMPR_MIN
+#elif PLAY_SAMPR_CAPS & SAMPR_CAP_48
+# define PLAY_SAMPR_MIN     SAMPR_48
+# define PLAY_SAMPR_MAX     SAMPR_48
+# define PLAY_SAMPR_DEFAULT SAMPR_48
+# define PLAY_SAMPR_HW_MIN  HW_SAMPR_MIN
+#endif