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prepare threshold for silence trim

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This commit is contained in:
Robin Gareus 2016-02-16 21:25:54 +01:00
parent 31442cd63d
commit 0ce4113dbb
1 changed files with 23 additions and 2 deletions
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25
libs/audiographer/audiographer/general/silence_trimmer.h
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@ -12,6 +12,24 @@
namespace AudioGrapher {
template<typename T> struct SilenceTester;
// this needs to be implemented for every datatype T
// currently Ardour always uses Sample aka float
template <>
struct SilenceTester<float> {
public:
SilenceTester (const float dB) {
threshold = dB > -318.8f ? pow (10.0f, dB * 0.05f) : 0.0f;
}
bool is_silent (const float d) {
return fabsf (d) <= threshold;
}
private:
float threshold;
};
/// Removes and adds silent frames to beginning and/or end of stream
template<typename T = DefaultSampleType>
class /*LIBAUDIOGRAPHER_API*/ SilenceTrimmer
@ -23,9 +41,10 @@ class /*LIBAUDIOGRAPHER_API*/ SilenceTrimmer
public:
/// Constructor, \see reset() \n Not RT safe
SilenceTrimmer(framecnt_t silence_buffer_size_ = 1024)
SilenceTrimmer(framecnt_t silence_buffer_size_ = 1024, float thresh_dB = -INFINITY)
: silence_buffer_size (0)
, silence_buffer (0)
, tester (thresh_dB)
{
reset (silence_buffer_size_);
add_supported_flag (ProcessContext<T>::EndOfInput);
@ -231,7 +250,7 @@ class /*LIBAUDIOGRAPHER_API*/ SilenceTrimmer
bool find_first_non_zero_sample (ProcessContext<T> const & c, framecnt_t & result_frame)
{
for (framecnt_t i = 0; i < c.frames(); ++i) {
if (c.data()[i] != static_cast<T>(0.0)) {
if (!tester.is_silent (c.data()[i])) {
result_frame = i;
// Round down to nearest interleaved "frame" beginning
result_frame -= result_frame % c.channels();
@ -284,6 +303,8 @@ class /*LIBAUDIOGRAPHER_API*/ SilenceTrimmer
framecnt_t silence_buffer_size;
T * silence_buffer;
SilenceTester<T> tester;
};
} // namespace