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add API function to perform volume adjustment on a frame of SLINEAR data

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documentation cleanup


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6874 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin P. Fleming
2005-10-28 16:20:44 +00:00
parent d47e839c32
commit 0d34142f7e
2 changed files with 30 additions and 3 deletions
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19
frame.c
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@@ -1252,3 +1252,22 @@ int ast_codec_get_len(int format, int samples)
return len;
}
int ast_frame_adjust_volume(struct ast_frame *f, int adjustment)
{
int count;
short *fdata = f->data;
if ((f->frametype != AST_FRAME_VOICE) || (f->subclass != AST_FORMAT_SLINEAR))
return -1;
for (count = 0; count < f->samples; count++) {
if (adjustment > 0) {
fdata[count] *= abs(adjustment);
} else if (adjustment < 0) {
fdata[count] /= abs(adjustment);
}
}
return 0;
}

14
include/asterisk/frame.h
View File

@@ -49,7 +49,7 @@ struct ast_frame {
int samples;
/*! Was the data malloc'd? i.e. should we free it when we discard the frame? */
int mallocd;
/*! How far into "data" the data really starts */
/*! How many bytes exist _before_ "data" that can be used if needed */
int offset;
/*! Optional source of frame for debugging */
const char *src;
@@ -64,8 +64,8 @@ struct ast_frame {
};
#define AST_FRIENDLY_OFFSET 64 /*! It's polite for a a new frame to
have this number of bytes for additional
headers. */
have this number of bytes for additional
headers. */
#define AST_MIN_OFFSET 32 /*! Make sure we keep at least this much handy */
/*! Need the header be free'd? */
@@ -419,6 +419,14 @@ static inline int ast_codec_interp_len(int format)
return (format == AST_FORMAT_ILBC) ? 30 : 20;
}
/*!
\brief Adjusts the volume of the audio samples contained in a frame.
\param f The frame containing the samples (must be AST_FRAME_VOICE and AST_FORMAT_SLINEAR)
\param adjustment The number of dB to adjust up or down.
\return 0 for success, non-zero for an error
*/
int ast_frame_adjust_volume(struct ast_frame *f, int adjustment);
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif