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audio/format: add some helper functions

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This commit is contained in:
wm4 2013-10-22 01:01:41 +02:00
parent bb5fe4d874
commit 33707c6d63
2 changed files with 33 additions and 0 deletions
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30
audio/format.c
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@ -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;

3
audio/format.h
View File

@ -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 */