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added helper functions for buffer<->framerate<->duration conversions

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git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3645 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
beveloper 2003-06-24 22:39:13 +00:00
parent e548161b59
commit 299d70ad2d
2 changed files with 32 additions and 6 deletions
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29
src/add-ons/media/media-add-ons/mixer/MixerUtils.cpp
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@ -1,6 +1,7 @@
#include <MediaDefs.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "MixerUtils.h"
#include "debug.h"
@ -159,3 +160,31 @@ CopySamples(float *_dst, int32 _dst_sample_offset,
dst += dst_sample_offset;
}
}
int64
frames_for_duration(double framerate, bigtime_t duration)
{
return (int64) ceil(framerate * double(duration) / 1000000.0);
}
bigtime_t
duration_for_frames(double framerate, int64 frames)
{
return (bigtime_t)((1000000.0 * frames) / framerate);
}
int
bytes_per_frame(const media_multi_audio_format & format)
{
return format.channel_count * (format.format & 0xf);
}
int
frames_per_buffer(const media_multi_audio_format & format)
{
int frames = 0;
if (bytes_per_frame(format) > 0) {
frames = format.buffer_size / bytes_per_frame(format);
}
return frames;
}

9
src/add-ons/media/media-add-ons/mixer/MixerUtils.h
View File

@ -1,4 +1,3 @@
#include <math.h>
void string_for_channel_mask(char *str, uint32 mask);
void fix_multiaudio_format(media_multi_audio_format *format);
@ -13,13 +12,11 @@ void CopySamples(float *_dst, int32 _dst_sample_offset,
const float *_src, int32 _src_sample_offset,
int32 _sample_count);
int bytes_per_frame(const media_multi_audio_format & format);
int frames_per_buffer(const media_multi_audio_format & format);
int64 frames_for_duration(double framerate, bigtime_t duration);
inline int64 frames_for_duration(double framerate, bigtime_t duration)
{
return (int64) ceil(framerate * double(duration) / 1000000.0);
}
bigtime_t duration_for_frames(double framerate, int64 frames);
int ChannelMaskToChannelType(uint32 mask);
uint32 ChannelTypeToChannelMask(int type);