Changeset 20d77fb in mainline

Timestamp:

2012-08-30T16:28:28Z (12 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

f3fb83a

Parents:

37367f7

Message:

libpcm: Add helper functions.

Location:

uspace/lib/pcm/include/pcm

Files:

• format.h (modified) (1 diff)
• sample_format.h (modified) (2 diffs)

uspace/lib/pcm/include/pcm/format.h

@@ -61 +61 @@
 static inline size_t pcm_format_frame_size(const pcm_format_t *a)
 {
-        return a->channels * pcm_sample_format_size(a->sample_format);
+        return pcm_sample_format_frame_size(a->channels, a->sample_format);
+}
+
+static inline suseconds_t pcm_format_size_to_usec(size_t size,
+    const pcm_format_t *a)
+{
+        return pcm_sample_format_size_to_usec(size, a->sampling_rate,
+            a->channels, a->sample_format);
 }
 

uspace/lib/pcm/include/pcm/sample_format.h

@@ -38 +38 @@
 
 #include <bool.h>
+#include <time.h>
 
 typedef enum {
@@ -121 +122 @@
 }
 
+static inline size_t pcm_sample_format_frame_size(unsigned channels,
+    pcm_sample_format_t format)
+{
+        return pcm_sample_format_size(format) * channels;
+}
+
+static inline size_t pcm_sample_format_size_to_frames(size_t size,
+    unsigned channels, pcm_sample_format_t format)
+{
+        const size_t frame_size = pcm_sample_format_frame_size(channels, format);
+        return (size + frame_size - 1) / frame_size;
+}
+
+static inline useconds_t pcm_sample_format_size_to_usec(size_t size,
+    unsigned sample_rate, unsigned channels, pcm_sample_format_t format)
+{
+        const long long frames =
+            pcm_sample_format_size_to_frames(size, channels, format);
+        return (frames * 1000000ULL) / sample_rate;
+}
+
 static inline const char * pcm_sample_format_str(pcm_sample_format_t format)
 {