From 33707c6d6394592f528fb200af2dd6e104fc6df6 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Tue, 22 Oct 2013 01:01:41 +0200
Subject: audio/format: add some helper functions

---
 audio/format.c | 30 ++++++++++++++++++++++++++++++
 audio/format.h |  3 +++
 2 files changed, 33 insertions(+)

diff --git a/audio/format.c b/audio/format.c
index aa6099022f..c6c617cf28 100644
--- a/audio/format.c
+++ b/audio/format.c
@@ -42,6 +42,27 @@ int af_fmt2bits(int format)
     return 0;
 }
 
+static int bits_to_mask(int bits)
+{
+    switch (bits) {
+        case 8:  return AF_FORMAT_8BIT;
+        case 16: return AF_FORMAT_16BIT;
+        case 24: return AF_FORMAT_24BIT;
+        case 32: return AF_FORMAT_32BIT;
+        case 64: return AF_FORMAT_64BIT;
+    }
+    return 0;
+}
+
+int af_fmt_change_bits(int format, int bits)
+{
+    if (!af_fmt_is_valid(format) || (format & AF_FORMAT_SPECIAL_MASK))
+        return 0;
+    int mask = bits_to_mask(bits);
+    format = (format & ~AF_FORMAT_BITS_MASK) | mask;
+    return af_fmt_is_valid(format) ? format : 0;
+}
+
 /* Convert format to str input str is a buffer for the
    converted string, size is the size of the buffer */
 char* af_fmt2str(int format, char* str, int size)
@@ -90,6 +111,15 @@ const struct af_fmt_entry af_fmtstr_table[] = {
     {0}
 };
 
+bool af_fmt_is_valid(int format)
+{
+    for (int i = 0; af_fmtstr_table[i].name; i++) {
+        if (af_fmtstr_table[i].format == format)
+            return true;
+    }
+    return false;
+}
+
 const char *af_fmt2str_short(int format)
 {
     int i;
diff --git a/audio/format.h b/audio/format.h
index e4173550c6..66eec17cd8 100644
--- a/audio/format.h
+++ b/audio/format.h
@@ -131,6 +131,7 @@ extern const struct af_fmt_entry af_fmtstr_table[];
 
 int af_str2fmt_short(bstr str);
 int af_fmt2bits(int format);
+int af_fmt_change_bits(int format, int bits);
 
 // Amount of bytes that contain audio of the given duration, aligned to frames.
 int af_fmt_seconds_to_bytes(int format, float seconds, int channels, int samplerate);
@@ -138,4 +139,6 @@ int af_fmt_seconds_to_bytes(int format, float seconds, int channels, int sampler
 char* af_fmt2str(int format, char* str, int size);
 const char* af_fmt2str_short(int format);
 
+bool af_fmt_is_valid(int format);
+
 #endif /* MPLAYER_AF_FORMAT_H */
-- 
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