added limits for frames and channels

3 files changed, 77 insertions, 1 deletions

diff --git a/include/tinyalsa/limits.h b/include/tinyalsa/limits.h
new file mode 100644
index 0000000..6f788c2
--- /dev/null
+++ b/include/tinyalsa/limits.h
@@ -0,0 +1,62 @@
+/* limits.h
+**
+** Copyright 2011, The Android Open Source Project
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are met:
+**     * Redistributions of source code must retain the above copyright
+**       notice, this list of conditions and the following disclaimer.
+**     * Redistributions in binary form must reproduce the above copyright
+**       notice, this list of conditions and the following disclaimer in the
+**       documentation and/or other materials provided with the distribution.
+**     * Neither the name of The Android Open Source Project nor the names of
+**       its contributors may be used to endorse or promote products derived
+**       from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
+** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
+** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+** DAMAGE.
+*/
+
+#ifndef TINYALSA_LIMITS_H
+#define TINYALSA_LIMITS_H
+
+#include <tinyalsa/interval.h>
+
+#include <limits.h>
+#include <stdint.h>
+
+#define TINYALSA_SIGNED_INTERVAL_MAX SSIZE_MAX
+#define TINYALSA_SIGNED_INTERVAL_MIN SSIZE_MIN
+
+#define TINYALSA_UNSIGNED_INTERVAL_MAX SIZE_MAX
+#define TINYALSA_UNSIGNED_INTERVAL_MIN SIZE_MIN
+
+#define TINYALSA_CHANNELS_MAX 32U
+#define TINYALSA_CHANNELS_MIN 1U
+
+#define TINYALSA_FRAMES_MAX (ULONG_MAX / (TINYALSA_CHANNELS_MAX * 4))
+#define TINYALSA_FRAMES_MIN 0U
+
+#if TINYALSA_FRAMES_MAX > TINYALSA_UNSIGNED_INTERVAL_MAX
+#error "Frames max exceeds measurable value."
+#endif
+
+#if TINYALSA_FRAMES_MIN < TINYALSA_UNSIGNED_INTERVAL_MIN
+#error "Frames min exceeds measurable value."
+#endif
+
+extern const struct tinyalsa_unsigned_interval tinyalsa_channels_limit;
+
+extern const struct tinyalsa_unsigned_interval tinyalsa_frames_limit;
+
+#endif /* TINYALSA_LIMITS_H */
+
diff --git a/src/Makefile b/src/Makefile
index cde8267..56159d6 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -16,13 +16,15 @@ INCLUDE_DIRS = -I ../include
 override CFLAGS := $(WARNINGS) $(INCLUDE_DIRS) -fPIC $(CFLAGS)
 
 VPATH = ../include/tinyalsa
-OBJECTS = mixer.o pcm.o
+OBJECTS = limits.o mixer.o pcm.o
 
 .PHONY: all
 all: libtinyalsa.a libtinyalsa.so
 
 pcm.o: pcm.c pcm.h
 
+limits.o: limits.c limits.h
+
 mixer.o: mixer.c mixer.h
 
 libtinyalsa.a: $(OBJECTS)
diff --git a/src/limits.c b/src/limits.c
new file mode 100644
index 0000000..25bd352
--- /dev/null
+++ b/src/limits.c
@@ -0,0 +1,12 @@
+#include <tinyalsa/limits.h>
+
+const struct tinyalsa_unsigned_interval tinyalsa_channels_limit = {
+    .max = TINYALSA_CHANNELS_MAX,
+    .min = TINYALSA_CHANNELS_MIN
+};
+
+const struct tinyalsa_unsigned_interval tinyalsa_frames_limit = {
+    .max = TINYALSA_FRAMES_MAX,
+    .min = TINYALSA_FRAMES_MIN
+};
+