From 0d1323bbd1f06a99e0b58561a18d03fd73cf369e Mon Sep 17 00:00:00 2001
From: Dan Dennedy <dan@dennedy.org>
Date: Sun, 6 Mar 2011 22:16:01 -0800
Subject: [PATCH] Add mlt_audio_format_size().

---
 src/framework/mlt_frame.c | 24 ++++++++++++++++++++++--
 src/framework/mlt_frame.h |  1 +
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/src/framework/mlt_frame.c b/src/framework/mlt_frame.c
index 71ea33e5..b67da154 100644
--- a/src/framework/mlt_frame.c
+++ b/src/framework/mlt_frame.c
@@ -594,8 +594,7 @@ uint8_t *mlt_frame_get_alpha_mask( mlt_frame self )
  *
  * You do not need to deallocate the returned string.
  * \public \memberof mlt_frame_s
- * \param self a frame
- * \param format an image format enum
+ * \param format an audio format enum
  * \return a string for the name of the image format
  */
 
@@ -611,6 +610,27 @@ const char * mlt_audio_format_name( mlt_audio_format format )
 	return "invalid";
 }
 
+/** Get the amount of bytes needed for a block of audio.
+  *
+  * \public \memberof mlt_frame_s
+  * \param format an audio format enum
+  * \param samples the number of samples per channel
+  * \param channels the number of channels
+  * \return the number of bytes
+  */
+
+int mlt_audio_format_size( mlt_audio_format format, int samples, int channels )
+{
+	switch ( format )
+	{
+		case mlt_audio_none:   return 0;
+		case mlt_audio_s16:    return samples * channels * sizeof( int16_t );
+		case mlt_audio_s32:    return samples * channels * sizeof( int32_t );
+		case mlt_audio_float:  return samples * channels * sizeof( float );
+	}
+	return 0;
+}
+
 /** Get the audio associated to the frame.
  *
  * You should express the desired format, frequency, channels, and samples as inputs. As long
diff --git a/src/framework/mlt_frame.h b/src/framework/mlt_frame.h
index f54dee3a..13d0e268 100644
--- a/src/framework/mlt_frame.h
+++ b/src/framework/mlt_frame.h
@@ -137,6 +137,7 @@ extern int64_t mlt_sample_calculator_to_now( float fps, int frequency, int64_t p
 extern const char * mlt_image_format_name( mlt_image_format format );
 extern int mlt_image_format_size( mlt_image_format format, int width, int height, int *bpp );
 extern const char * mlt_audio_format_name( mlt_audio_format format );
+extern int mlt_audio_format_size( mlt_audio_format format, int samples, int channels );
 extern void mlt_frame_write_ppm( mlt_frame frame );
 
 /** This macro scales RGB into the YUV gamut - y is scaled by 219/255 and uv by 224/255. */
-- 
2.39.2